WO1997016586A1 - Water retentive cellulose fiber, method of manufacturing the same, and water retentive sheet comprising cellulose fiber of high water retentivity - Google Patents
Water retentive cellulose fiber, method of manufacturing the same, and water retentive sheet comprising cellulose fiber of high water retentivity Download PDFInfo
- Publication number
- WO1997016586A1 WO1997016586A1 PCT/JP1996/003171 JP9603171W WO9716586A1 WO 1997016586 A1 WO1997016586 A1 WO 1997016586A1 JP 9603171 W JP9603171 W JP 9603171W WO 9716586 A1 WO9716586 A1 WO 9716586A1
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- WIPO (PCT)
- Prior art keywords
- water
- fiber
- fibers
- cellulose
- retentive
- Prior art date
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 229920003043 Cellulose fiber Polymers 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 39
- 239000000835 fiber Substances 0.000 claims abstract description 350
- 229920000297 Rayon Polymers 0.000 claims abstract description 146
- 229920002678 cellulose Polymers 0.000 claims abstract description 86
- 239000001913 cellulose Substances 0.000 claims abstract description 86
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 75
- 238000010521 absorption reaction Methods 0.000 claims abstract description 67
- 239000000463 material Substances 0.000 claims abstract description 50
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 239000011347 resin Substances 0.000 claims abstract description 7
- 238000009987 spinning Methods 0.000 claims description 88
- 239000011550 stock solution Substances 0.000 claims description 84
- 239000002250 absorbent Substances 0.000 claims description 42
- 239000002131 composite material Substances 0.000 claims description 42
- 230000002745 absorbent Effects 0.000 claims description 35
- 239000000203 mixture Substances 0.000 claims description 23
- 239000002964 rayon Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 21
- 238000009991 scouring Methods 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 14
- 230000014759 maintenance of location Effects 0.000 claims description 9
- 239000012670 alkaline solution Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000004627 regenerated cellulose Substances 0.000 claims description 3
- 238000012217 deletion Methods 0.000 claims 2
- 230000037430 deletion Effects 0.000 claims 2
- 230000007423 decrease Effects 0.000 abstract description 3
- 206010021639 Incontinence Diseases 0.000 abstract description 2
- 239000004744 fabric Substances 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 120
- 239000000306 component Substances 0.000 description 53
- 206010016807 Fluid retention Diseases 0.000 description 52
- 239000007864 aqueous solution Substances 0.000 description 42
- 229920002125 Sokalan® Polymers 0.000 description 36
- 239000004584 polyacrylic acid Substances 0.000 description 36
- 239000003513 alkali Substances 0.000 description 29
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 28
- 239000000243 solution Substances 0.000 description 26
- 230000008929 regeneration Effects 0.000 description 24
- 238000011069 regeneration method Methods 0.000 description 24
- 238000001035 drying Methods 0.000 description 15
- 229910000029 sodium carbonate Inorganic materials 0.000 description 14
- 239000006096 absorbing agent Substances 0.000 description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 101100165177 Caenorhabditis elegans bath-15 gene Proteins 0.000 description 8
- 239000004583 superabsorbent polymers (SAPs) Substances 0.000 description 8
- 239000011358 absorbing material Substances 0.000 description 7
- 239000000499 gel Substances 0.000 description 7
- 239000004745 nonwoven fabric Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 7
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 6
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 238000005192 partition Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 3
- 239000008358 core component Substances 0.000 description 3
- -1 cyanomethyl Chemical group 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 3
- 229920001059 synthetic polymer Polymers 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 2
- 210000001124 body fluid Anatomy 0.000 description 2
- 239000010839 body fluid Substances 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000007380 fibre production Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000000877 morphologic effect Effects 0.000 description 2
- 235000020077 pisco Nutrition 0.000 description 2
- 229920002239 polyacrylonitrile Polymers 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229920000247 superabsorbent polymer Polymers 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 210000002700 urine Anatomy 0.000 description 2
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 2
- 229960001763 zinc sulfate Drugs 0.000 description 2
- 229910000368 zinc sulfate Inorganic materials 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical class OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229920001407 Modal (textile) Polymers 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002169 ethanolamines Chemical class 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000002175 menstrual effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/02—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from cellulose, cellulose derivatives, or proteins
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/425—Cellulose series
- D04H1/4258—Regenerated cellulose series
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2922—Nonlinear [e.g., crimped, coiled, etc.]
- Y10T428/2924—Composite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2929—Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2933—Coated or with bond, impregnation or core
- Y10T428/2964—Artificial fiber or filament
- Y10T428/2965—Cellulosic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3146—Strand material is composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/637—Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/637—Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
- Y10T442/638—Side-by-side multicomponent strand or fiber material
Definitions
- the present invention relates to a cellulose-based highly water-retaining male fiber used as a water-retaining material for absorbents that absorb body fluids in sanitary napkins, paper diapers, incontinence pads, etc., a method for producing the same, and water-retaining properties formed from this fiber.
- a cellulose-based highly water-retaining male fiber used as a water-retaining material for absorbents that absorb body fluids in sanitary napkins, paper diapers, incontinence pads, etc.
- Disposable diapers, sanitary napkins, and other sanitary products have an absorber in the part that receives body fluids such as urine and menstrual blood. It has a structure in which pulp or superabsorbent resin (hereafter referred to as water retention material) is sandwiched between it and an impermeable sheet. Along with this, it is becoming necessary to improve the performance of the water-retaining material in the absorbent and improve the shape stability. As described in , powdery polymer absorbents are often used.
- powdery high-molecular absorbing material synthetic high-molecular polyacrylic acid compounds, polyvinyl-based compounds and the like are known, and natural high-molecular cyanomethyl cellulose, carboxymethyl cellulose and the like are also known. ing.
- a fibrous polymer water absorbing material a fiber manufactured by a method of mixing a sodium salt of carboxymethyl cellulose with viscose and spinning described in Japanese Patent Application Publication No. 56-9418. and fibers produced by the method of carboxymethylating regenerated cellulose fibers described in Japanese Patent Application Publication No. 60-2707, and Japanese Patent Application Publication No. 55-1327
- the acrylonitrile fiber described in No. 54 is hydrolyzed, and the outer surface is coated with a polyacrylic acid-based water-absorbing A fiber with a double-layered structure is known.
- water-retaining material When such a water-retaining material is used in the absorbent body of sanitary products such as paper diapers and sanitary napkins, it is required to have good water absorption. Furthermore, it is also necessary to have good so-called water retentivity, that is, not to release moisture once absorbed even when pressure is applied.
- the fiber strength at the time of drying is about 0.8 g Z denier (gZd).
- the powdery water retaining material easily falls off from the absorbent body.
- it becomes a gel state with high fluidity, and there is a problem that the shape stability is poor.
- the powdery water-retaining material When used as a water-retaining material in an absorbent body such as a paper diaper, the water-retaining material gels in the paper diaper when urine is absorbed. When the person wearing the disposable diaper moves, the gel moves and becomes unevenly distributed in the absorber. Also, this gel is sticky. For this reason, there is a problem that the wearer feels uncomfortable and the feeling of use is deteriorated.
- the fibrous water retaining material produced by mixing sodium salt of carboxymethyl cellulose with viscose has high compatibility and properties as a fiber because both viscose and carboxymethyl cellulose are cellulose-based. I have. However, water retention is insufficient.
- a fibrous water-retaining material produced by carboxymethylating leon has poor morphological stability because the entire fiber has water absorption properties, and when it absorbs water, the fiber itself gels. In addition, there is a problem that the fiber strength when dried is low.
- a double-structure fibrous water-retaining material in which a polyacrylic acid-based water-absorbing layer is formed on the outer surface of an acrylonitrile-based fiber has a problem that the manufacturing process of this water-retaining material is complicated.
- the present invention is intended to solve the above problems, and is safe when used as an absorbent for sanitary products such as disposable diapers and sanitary napkins, has a high water retention rate, and is in a fiber form even when it absorbs water.
- a highly water-retaining fiber having high morphological stability and sufficient fiber strength for handling when dry, and this highly water-retaining fiber
- the present invention provides an absorbent body using fibers.
- the present invention relates to a cellulosic high water-retaining fiber comprising a non-cellulosic superabsorbent material uniformly contained in the cellulosic fiber.
- the cellulose fiber and the highly water-absorbent material are sufficiently mixed to the extent that it is difficult to identify both, and the highly water - absorbent material is uniformly dispersed in the cellulose fiber. ing.
- Cellulose fibers and superabsorbent materials both have high water absorbency and excellent water retention. For this reason, cellulose-based highly water-retentive fibers that uniformly contain both of these components have superior water-absorbing and water-retaining properties compared to conventional fibers made only of cellulose and superabsorbent resins (SAP).
- the cellulose-based highly water-retentive fibers are highly water-absorbent and do not easily fall off during a mechanical processing step such as a fiber opening step, or when absorbing water.
- the highly water-absorbent material exposed on the outer surface of the cellulose-based highly water-retentive fiber may fall off when the fiber absorbs water.
- the highly absorbent material on the outer surface can effectively absorb water.
- the cellulose-based highly water-retentive fiber of the present invention is a composite fiber in which a component uniformly containing a non-cellulose-based highly water-absorbing material in the cellulose fiber and a single component of cellulose alone are joined side-by-side. is also included.
- a core is formed from a component uniformly containing a non-cellulose water-absorbent material in cellulose fibers, and the core is wrapped with a sheath formed from a single component of cellulose.
- the fiber In the side-by-side composite fiber, a component in which a superabsorbent material is uniformly dispersed in cellulose fibers and a cellulose component alone are joined together, and the component containing the superabsorbent material absorbs and retains water. , and cellulose alone have the mechanical properties of fibers, respectively. Therefore, the fiber has high water absorption and retention, high fiber strength, and high shape stability.
- a sheath-core type composite male fiber in which a core formed from a component in which the superabsorbent material is uniformly dispersed in cellulose fibers and a sheath formed from a single cellulose component are joined. has a structure in which a component (core) containing a superabsorbent material is covered with a single cellulose component (sheath). For this reason, the highly water-absorbing material does not come off from the fibers at any stage of the process of absorbing water and manufacturing the fibers. By forming the sheath component into a thin film, water absorption can be ensured.
- the content ratio of the highly absorbent material to the cellulose fibers in the conjugated fibers, and the ratio of the highly absorbent material to the cellulose fibers in the conjugated fibers Even if the content ratio of the superabsorbent material to the cellulose fiber in the single-component fiber is the same, the composite fiber has higher water absorption and water retention than the single-component fiber, and The dry strength of the fiber is increased.
- cellulose fibers are mainly viscose rayon fibers. However, other hydrophilic cellulose fibers may be used.
- the super absorbent material is mainly polyacrylate.
- Polyacrylate is generally commercially available as a polyacrylic acid-based water absorbing agent or a polyacrylic acid-based super absorbent resin, and can be easily obtained.
- the polyacrylic acid-based water absorbing agent or polyacrylic acid-based super absorbent resin is lightly cross-linked polyacrylic acid, starch and polyacrylic acid. It is a salt-grafted product or a water-absorbing polymer mainly composed of a polyacrylic acid skeleton, and these are used alone or in combination of two or more.
- isobutylene monomaleic anhydride copolymers can also be used.
- polyvinyl alcohol-based or polyoxyethylene-based super absorbent polymer may be used as the super absorbent material.
- the cellulose-based highly water-retentive fiber of the present invention has a water absorption rate of 700% or more.
- the water absorption rate referred to here is a value that can be expressed by the following formula 1, where the weight of the fiber before water absorption is A grams, and the weight of the fiber after water absorption is B grams.
- V(%) ⁇ (B-A)/A ⁇ X 100
- the cellulose-based highly water-retaining fibers have a water-retaining rate of 200% or more.
- the water retention rate here means the weight of the fiber before water absorption is C grams, the water is drained after water absorption, and When the weight of the fiber dehydrated by centrifugation is D grams, the value is expressed by the following equation 2.
- the cellulose-based highly water-retaining fiber of the present invention has high water absorption and water retention.
- this cellulose-based highly water-retentive fiber can maintain the shape of the fiber both when it is dry and when it absorbs water. Therefore, when the fibers are wrapped in a paper sheet or the like to form an absorbent body used in disposable diapers or sanitary napkins, the fibers do not move in the disposable diapers or sanitary napkins. Therefore, it is possible to provide disposable diapers and sanitary napkins having high water absorbency and water retention without causing discomfort to the wearer.
- the cellulose-based highly water-retentive fibers are processed into sheets, or woven into other fiber webs or non-woven fabrics.
- An absorbent body may be manufactured from this sheet.
- the absorbent body thus formed has high water absorption and retention even though it is thin. Therefore, when this absorber is used for paper diapers and sanitary napkins, the paper diapers and sanitary napkins can be made thinner.
- the cellulose-based highly water-retentive fiber of the present invention has the property that the fiber-forming polymer is not a synthetic polymer substance such as polyacrylonitrile but cellulose, so that it is easily decomposed and decomposed quickly in soil. .
- the dry strength of the fiber is 0.8 g no denier ( g/d) or more, and the fineness is preferably 5 denier or more and 15 denier or less.
- the unit of dry strength, g/d represents the tensile strength of a fiber equivalent to 1 denier.
- the fineness is 15 denier or more, the water absorbency decreases, so the fineness is preferably 15 denier or less.
- a sheet, a nonwoven fabric, or a fiber wetsuit containing the cellulose-based highly water-retentive fiber of the present invention Multiple sheets of tabs are stacked, or sandwiched between paper sheets from above and below and glued together. Then, after bonding, it is molded into a predetermined shape to form an absorber.
- the sheet, nonwoven fabric, or fiber web containing the cellulose-based highly water-retentive fibers of the present invention may be formed into a predetermined shape and then bonded.
- a sheet having a predetermined shape may be formed by heat processing.
- This sheet does not lose its shape because the highly water-retentive fibers in the sheet are securely connected by heat-fusible fibers. Furthermore, the sheets can be heat-sealed together in the sheet bonding process. In this heat-sealing process, the entire sheet can be evenly adhered. It is preferable that the cellulose-based highly water-retainable fibers contained in the water-retentive sheet be 10% by weight or more and 80% by weight or less, and the heat-fusible fibers be 20% by weight or more and 80% by weight or less.
- the sheet containing the highly water-retentive fibers has a basis weight of 10 g Zm 2 or more and 500 g/m 2 or less.
- the method for producing cellulose-based highly water-retainable fibers of the present invention is characterized by spinning, drawing, and scouring a spinning dope obtained by uniformly mixing cellulose fibers with a non-cellulose-based highly water-retaining material as a raw material. is.
- a spinning dope obtained by uniformly mixing a non-cellulose-based highly water-retentive material with the above-mentioned cellulosic component, and a dope component consisting of cellulose fibers alone. are compounded by a nozzle, spinning, drawing, and scouring.
- viscose rayon fiber when viscose rayon fiber is used as the cellulose fiber and polyacrylate is used as the non-cellulose-based highly water-absorbing material, ordinary viscose rayon fiber is used as the spinning dope.
- Use viscose for Viscose for ordinary viscose rayon fibers mainly has a cellulose concentration of 7% by weight or more and 10% by weight or less, an alkali concentration of 5% by weight or more and 6% by weight or less, and a Hottenroth number of 8 to 12.
- Viscose for ordinary viscose rayon. Sodium hydroxide is mainly used as the alkaline agent in this viscose.
- viscose in which the composition of each component in this viscose is changed may be used. Viscose for strong rayon, viscose for polynosic, Viscose for HWM may be used.
- the polyacrylate when using a polyacrylate as the non-cellulose superabsorbent material, the polyacrylate may be mixed with the viscose undiluted solution.
- the amount of the polyacrylic acid salt mixed is preferably 10% by weight or more and 200% by weight or less based on the total weight of the cellulose fibers in the viscose. If the mixed amount is less than 10% by weight, a sufficient water retention rate cannot be obtained. On the other hand, if it exceeds 200% by weight, the amount of polyacrylate in the viscose stock solution becomes excessive, resulting in poor spinnability in the regeneration bath during spinning, making smooth spinning difficult.
- the alkaline solution used for this alkaline cleaning treatment is preferably an aqueous sodium carbonate solution or an aqueous sodium bicarbonate solution.
- Alkali treatment increases the water absorbency and water retention of the fiber.
- FIG. 1 is a diagram showing a flow sheet of the manufacturing process of the highly water-retentive fiber of the present invention.
- FIG. 2 is a diagram schematically showing the cross-sectional structure of the composite portion of a typical composite fiber spinning nozzle used in the manufacturing process of the highly water-retainable fabric of the present invention.
- 3 is a cross-sectional view of the regeneration bath in the regeneration step, and
- FIG. 4 is a diagram showing the structure of the sanitary napkin absorber using the high water-holding fiber.
- FIG. 5 is a cross-sectional view of the absorber shown in FIG. 4 taken along line V--V. Best Mode for Carrying Out the Invention
- FIG. 1 shows a flow sheet of the manufacturing process of the highly water-retentive fiber of the present invention.
- a step of mixing the course stock solution 1 and the polyacrylate 2 A is the spinning stock solution obtained by the mixing step 4, B is the piscose stock solution containing only cellulose fibers, 5 is the spinning stock solution A, or the spinning stock solution A and viscose A recycling process in which the undiluted spinning solution A or the discharged undiluted spinning solution A or the undiluted spinning solution A and the viscose undiluted solution B are solidified by discharging the undiluted stock solution B into the regeneration bath through a nozzle.
- Drawing process 7 is a scouring process in which the drawn yarn is scouring by bleaching, etc.
- 8 is an alkali treatment process in which the scoured yarn is treated with an alkali
- 9 is a scouring process 7 or an alkali treatment process This is a drying step for drying the fibers obtained through step 8.
- F is a viscose rayon-polyacrylic acid-based highly water-retentive fiber manufactured through the manufacturing process shown in FIG.
- pisco-su undiluted solution B is not used.
- viscose stock solution used for producing the highly water-retentive fiber of the present invention indicated by reference numeral 1 for example, a spinning stock solution for ordinary viscose rayon fibers is used.
- the spinning stock solution for ordinary viscose threon fibers mainly has a cellulose concentration of 7% to 10% by weight, a sodium hydroxide concentration of 5% to 6% by weight, and a hot-roll value of 8%.
- viscose in which the value of each component in this viscose is changed may be used.
- viscose for strong rayon, viscose for borinosic, and viscose for HWM may also be used.
- alkali component in the viscose as described above, sodium hydroxide is usually used, and other alkali components may be used.
- the polyacrylate 2 is powdery when dry. In the present invention, it is preferable to use powder with a particle size of 30 microns or less. If the particle size exceeds 30 microns, the spinnability during spinning decreases, and the polyacrylate is exposed on the fiber surface of the manufactured water-retentive fiber F, and the polyacrylate falls off from the fiber F. easier.
- the particle size of the polyacrylate is particularly preferably 10 microns or less, more preferably less than 5 microns.
- the mixing step 4 when the viscose stock solution 1 and the polyacrylate 2 are mixed, if the powdered polyacrylate 2 is directly added to the viscose stock solution 1, the dispersibility of the polyacrylate 2 is deteriorated. , cannot be uniformly mixed. Therefore, it is preferable to previously disperse the polyacrylate 2 in the sodium hydroxide aqueous solution 3, add this solution to the viscose undiluted solution 1, and stir and mix. Since the viscose stock solution 1 contains sodium hydroxide as an alkaline component, the mixture of the polyacrylate 2 and the sodium hydroxide aqueous solution 3 is dispersed in the viscose stock solution 1. It's easy to do.
- the boriaacrylate salt 2 can be uniformly dispersed in the viscose stock solution 1 .
- the alkaline solution for dissolving the boriaacrylate salt 2 may contain the same alkaline component as that in the viscose undiluted solution. Therefore, when using an alkali other than sodium hydroxide as an alkali component in the viscose stock solution 1, the aqueous solution containing this alkali 5 is added to the sodium hydroxide aqueous solution 3 Use instead of
- the concentration of the sodium hydroxide aqueous solution 3 is 10% by weight or more and 30% by weight or less.
- the concentration of sodium hydroxide in the aqueous sodium hydroxide solution 3 should be adjusted so as to approximately match the concentration of sodium hydroxide in the viscose undiluted solution 1 .
- the sodium hydroxide aqueous solution 3 is mixed with the polyacrylate 2 so that the concentration in the sodium hydroxide aqueous solution 3 is 20% by weight or more and 40% by weight or less.
- Polyacrylate 2 is finally contained in the viscose rayon-polyacrylic acid-based high water-retaining fiber F, with respect to the weight of the total cellulose contained in the viscose rayon-polyacrylic acid-based high water-retaining fiber F. , 10% by weight or more and 200% by weight or less. If the compounding amount exceeds 200% by weight, the spinnability will deteriorate, making it difficult to produce the fiber. because it cannot be
- an aqueous sodium hydroxide solution 3 is added to the mixed solution of the viscose stock solution 1 and the polyacrylate 2, and the cellulose concentration, the sodium hydroxide concentration, and the weight of the polyacrylate with respect to the cellulose are determined. Adjust the displacement ratio to obtain a spinning dope A.
- the fiber is manufactured from a single component containing the boriaacrylate uniformly in the cell mouth fiber. In that case, spinning is performed by the following spinning process using only the spinning stock solution A as a raw material. In addition, when producing a composite fiber in which a component uniformly containing polyacrylate in cellulose fibers and a component consisting only of cellulose fibers are combined , the spinning stock solution A and polyacrylate are not included.
- Viscose stock solution B is viscose for normal viscose rayon. This spinning process is the same as spinning viscose rayon.
- step 5 the spinning stock solution A, or the spinning stock solution A and the viscose stock solution B are discharged from a nozzle into the regeneration bath.
- a nozzle having a shape generally used for spinning acrylonitrile-based composite fiber is used. Spinning stock solution A and viscose stock solution B are combined in the holes,
- Fig. 2 shows a model of the cross-sectional structure of a typical spinning nozzle for composite fibers.
- 10 indicates the entire nozzle
- 11 indicates a partition wall
- 12 indicates a nozzle plate
- 13 indicates a nozzle hole
- 14 indicates a thread discharged from the nozzle hole 13, respectively.
- the spinning stock solution A and the piscot stock solution B to be combined are arranged through the partition wall 11 and supplied separately.
- the spinning solution A is supplied to both sides through the partition wall 11, or a nozzle without the partition wall 11 is used.
- the spinning stock solution A and the viscose stock solution B are bonded to each other at the nozzle hole 13 to be combined.
- the composite ratio of both components changes.
- the quantitative ratio of both components can be freely set.
- the ratio of the cellulose in the fiber produced from the viscose stock solution B to the cellulose in the fiber produced from the spinning stock solution A is, for example, 1:1 or 1:2.
- Spinning stock solution A and viscose stock solution B are supplied in predetermined amounts of 5 forces each.
- the composite fiber produced from the spinning stock solution A and the viscose stock solution B is a side-by-side type composite fiber in which the fiber formed from the spinning stock solution A and the fiber formed from the viscose stock solution B are simply bonded. and the textile fiber formed from the spinning stock solution A as a core Then, there is a sheath-core type composite fiber in which a sheath formed from the pisco-su undiluted solution B envelops the core.
- the viscose stock solution B which is the raw material of the viscose
- the feed rate of the diluted piscose stock solution B is set to 1.5 times or more the supply amount of the spinning stock solution A, and the viscose stock solution B and the spinning stock solution A are discharged from the nozzle.
- a sheath component is formed from the viscose stock solution B having a low concentration of cellulose fibers, a core component is formed from the spinning stock solution A, and a sheath-core type composite fiber in which the core component is wrapped by the sheath component can be produced.
- the nozzle 10 is placed in a regeneration bath 15, and the spinning stock solution A or the spinning stock solution A and the viscose stock solution B discharged from the nozzle 10 are immediately discharged into the regeneration bath. Placed in an aqueous solution 1 6 in 1 5.
- the aqueous solution 16 in the regeneration bath 15 the aqueous solution normally used for the regeneration bath for viscose rayon can be used as it is. Specifically, at a temperature of 40 ° C or higher and 50 ° C or lower, 90 g or more and 120 g or less of sulfuric acid and 300 g or more and 400 g of sodium sulfate in 1 liter of water.
- an aqueous solution containing zinc sulfate at a ratio of 10 g or more and 20 g or less is used.
- the spinning stock solution A, or the spinning stock solution A and the viscose stock solution B discharged from the nozzle 10 react with sulfuric acid in the aqueous solution 16 and solidify to form a gel-like filament 14 .
- the thread 14 discharged from the nozzle 10 is immersed in the aqueous solution in the regeneration bath for the length indicated by L.
- the length of this L is called the spinning bath immersion length.
- the spinning bath immersion length is preferably 20 cm or more and 60 cm or less.
- the spinning stock solution A, or the spinning stock solution A and the viscose stock solution B are discharged into the regeneration bath 15 at a discharge linear velocity of ⁇ minutes or more and 20 mZ minutes or less. Then, a gel-like thread 14 is formed in the regeneration bath 15. A draft of 50% to 300% (1.5 times to 4.0 times) is given to this gel-like filament 14, and it is drawn from the regeneration bath 15 by a mouthpiece or the like. The gel-like filament 14 taken out from the regeneration bath 15 is then stretched in a stretching step 6 while being wound around a roller or the like. In this drawing step 6, the molecules in the thread 14 are arranged regularly. At this time, if the molecules are bi-oriented, the tensile strength of the highly water-retentive fiber F increases, but it becomes difficult to stretch.
- the gelled filament 14 is drawn in air, in a water bath, or a combination thereof.
- the gel-like thread is 30% to 50% longer than the original length, in other words, 1.3 to 1.5 times the original length, similar to pisco rayon. Stretched to length.
- the aqueous solution 16 in the regeneration bath 15 adheres to the gelled yarn 14, so the aqueous solution 16 is mixed in the water bath in the drawing step.
- the water bath drawing may be performed in a single bath in which the drawing is performed only in one water bath, or in a multi-bath bath in which the drawing is performed in a plurality of water baths.
- the drawing step 6 if the polyacrylate in the yarn 14 is exposed on the outer surface of the gel-like yarn 14, or is in a state close to it, the yarn 14 will be removed during the drawing.
- the side-by-side type conjugate fiber is in a fiber force- bonded state consisting of cellulose fibers containing polyacrylate formed from the spinning stock solution A and cellulose formed from the viscose stock solution B only. Therefore, polyacrylate particles are unevenly distributed in one component and mixed at high density. Therefore, in the drawing step 6, the polyacrylate is likely to fall off from the thread 14 . Therefore, it is preferable to stretch while traveling in space.
- the yarn 14 that has undergone the drawing step 6 is then introduced into the scouring step 7.
- the scouring step 7 is the same as the scouring step for producing viscose rayon. Specifically, the yarn 14 was heated at a temperature of 60°C to 70°C containing sodium sulfide and sodium hydroxide.
- the fine residual sulfur contained in the yarn 14 is removed by treating it with a mixed aqueous solution containing.
- One liter of the mixed aqueous solution contains 3.0 g ⁇ 1.0 g of sulfuric acid and 1.0 g ⁇ 0.5 g of sodium hydroxide. Bleaching with an aqueous sodium hypochlorite solution and neutralization of the bleaching agent with sulfuric acid are then carried out.
- the yarn that has passed through the scouring step 7 is dried in the drying step 9.
- the viscose rayon-polyacrylic acid-based high water retention synthetic fiber F is produced.
- alkali treatment 8 is performed before drying step 9. This alkali treatment can further enhance the water absorbency and water retention of the fiber. Since the aqueous solution 16 in the regeneration bath 15 of viscose rayon is an acidic solution, the water absorption performance of the mixed polyacrylate is lowered, and the water retention rate is lowered. The water retention capacity of the polyacrylate can be further enhanced by applying force and then performing alkali treatment.
- Alkali used in this alkali treatment is a generally used alkaline substance. That is, they are inorganic compounds such as alkali metal hydroxides, carbonates and bicarbonates, and basic organic compounds such as ethanolamines and alkanomonolamines. Sodium, potassium and the like are used as the alkaline metal. However, sodium carbonate is particularly preferred as the alkali used in the alkali treatment. The reason for this is that the required treatment time is the shortest, the required treatment concentration is the lowest, and there is no fear of sticking between fibers. In alkali treatment, an aqueous solution containing these alkaline substances is used.
- the concentration of sodium carbonate in the aqueous solution is 0.5% by weight or more and 10% by weight or less, and the pH of the aqueous solution is 10 or more and 12 or less. preferable.
- the thread 14 obtained through the scouring step 7 is immersed in this sodium carbonate aqueous solution at room temperature for 1 to 10 minutes. If the concentration of the aqueous solution is less than 0.5% by weight, it is insufficient to increase the water absorption capacity, and if it exceeds 10% by weight, adhesion between fibers will occur, and a water retention rate of 200% or more will be obtained. do not have. Similarly, when the treatment time is less than 1 minute, the treatment is insufficient, and when it exceeds 10 minutes, sticking occurs between the fibers.
- the viscose rayon-polyacrylic acid-based highly water-retentive fiber F is produced.
- rayon fiber and polyacrylate are sufficiently mixed to the extent that it is difficult to identify both, and the fiber is rayon.
- the polyacrylate is uniformly dispersed in the fiber.
- Both rayon fiber and polyacrylate have high water absorption and excellent water retention. Therefore, the highly water-retentive fiber F, which uniformly contains both of these components, has superior water-absorbing and water-retaining properties compared to conventional fibers made solely from cellulose fibers and highly water-absorbent polymers.
- the polyacrylate is exposed on the outer surface of the fiber. For this reason, the polyacrylate force on the outer surface of the fiber F may fall off. However, the polyacrylate on the outer surface can effectively absorb water.
- the fiber F can maintain its form as a fiber both when it is dried and when it absorbs water.
- the side-by-side type fiber in which a component in which polyacrylate is uniformly dispersed in rayon fiber and a single component of rayon are joined improves water absorption and retention.
- Each rayon single component has the mechanical properties of the fiber. For this reason, the fiber has properties such as water absorption, water retention, fiber strength, and shape stability.
- a sheath-core type composite fiber in which a component in which polyacrylate is uniformly dispersed in rayon is used as a core component and a single component of rayon is used as a sheath, the component containing polyacrylate is covered with a single component of rayon. It becomes a ffi structure. Therefore, the polyacrylate must not fall off from the fiber F at any stage during water absorption or fiber production. By forming the sheath component into a thin film, water absorption can be ensured.
- the content ratio of the bolyacrylate to the rayon fibers in the conjugate fibers, and the woven fabric composed of a single component in which the rayon fibers and the polyacrylate are uniformly dispersed Even if the content ratio of polyacrylate to rayon fiber in the inside is the same, it has higher water absorption and water retention than the male fiber made of the above single component, and the dry strength of the fiber is increased.
- the viscose rayon-polyacrylic acid-based highly water-retaining fiber F of the present invention thus formed has a water absorption rate of 700% or more and a water retention rate of 200% or more.
- the water absorption rate referred to here is a value that can be expressed by the following formula 1, where the weight of the fiber before water absorption is A grams and the weight of the fiber after water absorption is B grams. (Number 1 )
- V (%) ⁇ (B - A) / A ⁇ 100
- the water retention rate is defined as C grams for the weight of the fiber before water absorption, and D grams for the SS of the fiber that has been drained after absorbing water and dehydrated by centrifugation. is the value represented by Equation 2 below.
- this fiber F has a fineness of 5 denier or more and 15 denier or less, and a dry strength of 0.8 g Z d or more.
- This viscose rayon-polyacrylic acid-based highly water-retentive fiber F is in a filament state. Therefore, when a sheet is produced from this viscose rayon-polyacrylic acid-based highly water-retentive fiber F, this filamentous fiber is cut into lengths of 5 mm to 5 mm and used as short fibers. Even if this short fiber is used alone, it is excellent in water absorption and water retention. However, it is more preferred to be mixed with other water-absorbing substances such as super-absorbent polymers (SAP) such as polyacrylates and valves.
- SAP super-absorbent polymers
- the amount of each component contained in this mixture is 100% by weight or less for viscose rayon-polyacrylic acid high water retention fiber F force 510 SS%liLh, and 50% by weight for SAP 0% by weight or more. %, preferably 0% by weight or more and 50% by weight or less of pulp.
- the fiber F or the mixture obtained by mixing the fiber F, the SAP, and the pulp force can be wrapped in a paper sheet or the like as it is and used as an absorbent material for paper diapers, sanitary napkins, and the like.
- the fiber F can maintain its form as a fiber both when it is dry and when it absorbs water. Therefore, it is less likely to move between paper sheets.
- the polyacrylate in the fiber swells and turns into a gel state when it absorbs water, its movement is regulated by the cellulose fiber. Therefore, paper diapers and sanitary napkins using this absorber do not cause discomfort to the wearer.
- the mixture may be used as a raw material to form a sheet, or the mixture may be woven into other fiber webs or non-woven fabrics.
- the sheet, fiber web, or non-woven fabric formed from the mixture preferably has a basis weight of 10 gZm 2 or more and 500 gZm 2 or less.
- the water-retaining sheets containing the viscose rayon-polyacrylic acid-based highly water-retaining fibers F formed in this manner are formed by stacking only a few water-retaining sheets, or by stacking paper sheets from above and below. Each sheet is glued together. Then, when this bonded sheet is used, for example, as an absorber of a sanitary napkin, it is formed into a predetermined shape as shown in FIG. Alternatively, the water-retentive sheet may be molded in advance into the shape shown in Fig. 4, and these may be laminated and bonded.
- FIG. 5 is a sectional view taken along line V--V of FIG. 4; In the absorber 17 shown in FIGS.
- the water-retaining sheet 19 containing the viscose rayon-polyacrylic acid-based highly water-retaining fiber F is placed between the paper sheets 18 and 20. sandwiched. If the water-retaining sheet 19 contains many SAPs and valves, paper sheets 18 and 20 are placed above and below the water-retaining sheet 18 in this way to prevent the SAPs and valves from falling off. It is desirable to wrap the water-retentive sheet 19 with paper sheets 18, 20 in layers.
- water-retaining sheet 19 contains more viscose rayon-polyacrylic acid-based highly water-retaining fiber F than SAP or pulp, or when the viscose rayon-polyacrylic acid-based highly water-retaining fiber F is mixed with other fibers
- these water-retentive sheets may not be wrapped with paper sheets, and only several water-retentive sheets 19 may be stacked.
- each sheet may be adhered by applying an adhesive such as a hot-melt adhesive to the joining surface of each sheet and pressing the sheets while applying heat.
- an adhesive such as a hot-melt adhesive
- the water-retentive sheet 19 and the paper sheets 18, 20 are mixed with heat-fusible fibers. It is good to match.
- a sheet having a predetermined shape can be formed by mixing the highly water-retentive fiber F and the heat-fusible fiber and heat-processing the mixture.
- This sheet does not lose its shape because the highly water-retentive fibers F in the sheet are securely connected by heat-fusible fibers.
- heat is applied to melt the heat-fusible fibers, and the melted heat-fusible fibers are fused to each other at the joint surfaces of the sheets. Then each sheet is glued.
- the viscose rayon-polyacrylic acid-based highly water-retainable fibers F and the heat-fusible fibers are mixed, and a fiber web or non-woven fabric is formed from this mixture. do it.
- the viscose rayon-polyacrylic acid-based highly water-retaining fiber F contained in this water-retaining sheet is 10% by weight or more and 80% by weight or less, and the heat-fusible fiber is 20% by weight or more and 80% by weight. % by weight or less.
- This absorbent body is sandwiched between a liquid-permeable sheet facing the skin and a liquid-impermeable sheet facing outward to produce a sanitary napkin.
- this absorbent when used for a paper diaper or a pad, it is preferably molded in accordance with the shape of the paper diaper or pad. Then, it is sandwiched between a liquid-permeable membrane sheet facing the skin and a liquid-impermeable back sheet facing the outside of the body.
- the viscose rayon-polyacrylic acid-based highly water-retentive fiber F in the water-retentive sheet 19 has high water absorption and water retention, so even if the absorbent body is thin, it has high water absorption. and water retention.
- the viscose rayon-polyacrylic/leic acid-based highly water-retentive fiber F in the water-retentive sheet 19 does not become a gel state even when water is absorbed, the shape of the absorbent body 17 can be kept the same as before water absorption. be.
- the viscose rayon-polyacrylic acid-based highly water-retentive fiber F described above was manufactured by the same manufacturing method as the viscose rayon-polyacrylic acid-based fiber F of Examples 1 to 22 shown in Tables 1, 2 and 3 below.
- An acid-based highly water-retentive fiber was produced. just However, each example was manufactured by changing the manufacturing conditions by changing the ratio of the spinning stock solution A and the viscose stock solution B, or by changing the alkali treatment solution.
- the draw rate when producing the viscose rayon-polyacrylic acid-based highly water-retentive fiber is determined by the running linear speed of the regenerating bath (the speed at which the fiber is pulled out from the regenerating bath) and the final running linear speed (after the drawing process). It is the speed ratio with the running speed of the yarn), and is shown in Equation 3 below.
- the viscose rayon-polyacrylic acid-based highly water-retentive fiber of Example 1 was produced by the following steps (1) to (4).
- Powdered polyacrylate manufactured by Mitsui Cytec Co., Ltd., product name ACODUL A
- a particle size of 3 to 5 was added to 6% by weight of sodium hydroxide so that the solid content in the aqueous solution was 30% by weight. Dispersed in an aqueous solution.
- the liquid obtained in the above step (1) is mixed with viscose for ordinary viscose rayon containing 9% by weight of cellulose, 5.2% by weight of alkali, and a hottenroth number of 10, and the entire solution is diluted with an aqueous sodium hydroxide solution. Ingredient concentrations were adjusted. With this, 8% by weight of cellulose and 0.8% by weight of polyacrylate? , a spinning dope A having a sodium hydroxide concentration of 6% by weight was obtained. The polyacrylate content was 10% by weight with respect to the total weight of cellulose in this spinning dope.
- Step (3) Spinning dope A obtained in step (2) above is poured into the regeneration bath through the nozzle shown in Fig. 2. Dispense. As an aqueous solution in this regeneration bath, 110 grams of sulfuric acid, 17 grams of zinc sulfate, and 340 grams of sodium sulfate were mixed in 1 liter of water.
- step (3) above the discharged spinning dope turned into a gel-like thread in the regeneration bath.
- This gel-like yarn is given a draft of 50% to 100% (1.5 times to 2.0 times), taken out from the regeneration bath, stretched at a stretch rate of 40% by air stretching, Then, after going through a scouring process, a highly water-retentive fiber of Example 1 was obtained through a drying process.
- This fiber is a single component fiber in which rayon is uniformly mixed with polyacrylate.
- the fibers of Example 1 and Examples 2 to 7 described below were produced without any alkali treatment after the scouring step.
- Example 2 Of the production conditions in Example 1, only the composition of the spinning dope A was changed as shown in Table 1.
- the composition of the spinning dope A of Example 2 is 6% by weight of cellulose, 3% by weight of polyacrylate, and 6% by weight of sodium hydroxide.
- the spinning stock solution A of Example 3 contains 3% by weight of cellulose, 6% by weight of polyacrylate, and 6% by weight of sodium hydroxide.
- the concentration of the polyacrylate in this spinning stock solution was 50% by weight in Example 2 and 200% by weight in Example 3 with respect to the weight of cellulose.
- a viscose rayon-polyacrylic acid-based highly water-retentive fiber was produced in the same production process as in Example 1.
- the fibers of Examples 2 and 3 are also monocomponent fibers of rayon with polyacrylate uniformly mixed therein.
- a 6% by weight sodium hydroxide aqueous solution in which 30% by weight of the powdered polyacrylate used in Example 1 was dispersed was mixed with 9% by weight of cellulose, 5.7% by weight of sodium hydroxide, and a Hottenroth number of 10. It was mixed with viscose for ordinary viscose rayon to obtain a spinning dope A containing 7% by weight of cellulose, 1.6% by weight of polyacrylate, and 6% by weight of sodium hydroxide.
- the polyacrylate in this spinning dope A is It contains 10% by weight of cellulose.
- the viscose stock solution B was a viscose for ordinary viscose rayon containing 9% by weight of cellulose, 5.7% by weight of alkali, and a hottenroth number of 10.
- Composite fibers were produced using these spinning stock solution A and viscose stock solution B as materials.
- the nozzle used was a side-by-side type composite fiber nozzle with a hole size of 0.1 mm and 7660 holes. At .1 mZ seconds, it was discharged into the same regeneration bath used to make the high water retention fibers of Example 1.
- the gel-like filaments formed in the regeneration bath were drawn from the regeneration bath by applying a draft of 50 to 100%.
- the drawing process was carried out by air drawing, and the yarn was drawn so that the draw ratio was 40%, followed by a scouring process and drying to obtain a side-by-side type conjugate fiber.
- This composite fiber is referred to as the fiber of Example 4.
- Example 4 the composition of the spinning dope A was changed to 3% by weight of cellulose, 6% by weight of polyacrylate, and 6% by weight of sodium hydroxide.
- the polyacrylate in the spinning dope A is contained in an amount of 50% by weight with respect to the total weight of cellulose in the spinning dope A.
- the same viscose stock solution B as in Example 4 was used.
- the other manufacturing conditions were exactly the same as in Example 4, and the same manufacturing process as in Example 4 was used. As a result, a side-by-side composite fiber was produced.
- the spinning dope A having the same composition as in Example 4 was used.
- As the viscose stock solution B pure water and sodium hydroxide were added to the viscose for ordinary viscose rayon with 9% by weight of cellulose, 5.7% by weight of sodium hydroxide, and 5.7% by weight of Hottenroth number, and the cellulose was dissolved. It was adjusted to 4.5% by weight and 5.7% by weight of sodium hydroxide.
- piscose stock solution B one having the same composition as the viscose stock solution B used in Example 6 was used.
- Example 5 the spinning dope A having the same composition as in Example 5 was used. Using these spinning stock solution A and piscos stock solution B, highly water-retentive fibers were produced in the same production process as in Example 5.
- the fibers of Examples 8 to 11 were subjected to the scouring step in the manufacturing process of the fibers of Example 2, and then mixed into aqueous solutions of sodium carbonate having different concentrations of 1% by weight, 4% by weight, 10% by weight, and 15% by weight. It was soaked at 25°C for 5 minutes, treated with alkali, and then dried.
- the fibers of Examples 12 to 15 were subjected to the scouring step in the side-by-side type composite fiber manufacturing process of Example 5, and were subjected to 1% by weight, 4% by weight, 10% by weight,
- the fibers of Examples 16 to 19 had concentrations of 1% by weight, 4% by weight, 10% by weight, and 15% by weight after the scouring step in the manufacturing process of the sheath-core type composite fiber of Example 7. It is a sheath-core type conjugate fiber obtained by performing an alkali treatment at 25 ° C. for 5 minutes with an aqueous solution of sodium carbonate having a different temperature, followed by a drying process.
- the fiber of Example 20 was treated with a 4% by weight sodium hydroxide aqueous solution after the scouring step in the side-by-side type composite fiber manufacturing process of Example 525. It was obtained through an alkali treatment for 5 minutes and then a drying process.
- the fiber of Example 21 was subjected to an alkaline treatment with a 4% by weight aqueous solution of sodium bicarbonate at 25°C for 5 minutes after the scouring step in the manufacturing process of the side-by-side type composite fiber of Example 5. Then, it is obtained through a drying process.
- the fibers of Example 22 were also treated with a 4% by weight ethanolamine aqueous solution (EA ) Alkaline treatment at 25'C for 5 minutes followed by a drying process.
- EA ethanolamine aqueous solution
- Table 4 shows the fiber morphology (cross-sectional shape), water absorption rate, water retention rate, fineness, and dry strength of Examples 1 to 22 above.
- M indicates a normal fiber consisting of a single component
- S/S indicates a side-by-side type composite fiber
- S/C indicates a sheath-core type composite fiber.
- the water absorption V% was obtained by the following method.
- V (%) ⁇ (B-A)/A ⁇ 100 Further, the water retention rate ⁇ % is measured by the following method.
- the fiber of the present invention has a water absorption rate of 700% or more, a water retention rate of 200% or more, a fineness of 5 denier or more and 15 denier or less, and a dry strength of 0.8 g. Denier ( gZ d) or greater is desirable.
- the fibers of Example 1 are monocomponent fibers formed from Spinning Dope A only. devil It also had a water absorption rate of 708%, a water retention rate of 203%, a fineness of 4.78 denier, and a dry strength of 0.85 gZd.
- this fiber maintained its fiber form in a state containing water, had no fluidity, and had a strength to the extent that it could be pulled out as a single fiber in this state.
- the fiber of Example 2 had a water absorption rate of 730%, a water retention rate of 225%, a fineness of 456 denier, and a dry strength of 0.82 gZd.
- the fiber of Example 3 has a water absorption rate of 792%, a water retention rate of 240%, a fineness of 4.74 denier, and a dry strength of 0.85 gZd.
- the fiber of Example 3 has a higher concentration of polyacrylate in the spinning dope A than the fiber of Example 2. Therefore, compared to Example 2, the fibers of Example 3 are considered to have higher water absorption and retention.
- the fibers of Example 4 are side-by-side bicomponent fibers.
- the fiber of Example 4 has a water absorption rate of 1300%, a water retention rate of 401%, a fineness of 4.97 denier, and a dry strength of 0.99 g/d.
- the fibers of Example 4 are remarkably superior in tenacity and water holding capacity5 , and also have greater fineness and dry strength.
- this fiber is a component in which polyacrylate particles are uniformly dispersed in the fiber, and a composite fiber that is joined side-by-side with a component that does not contain polyacrylate. is observed.
- this composite fiber contains water, it maintains the shape of the fiber and has no fluidity. In addition, it had enough strength to be pulled out as a single fiber in this state.
- the conjugate fiber of Example 5 like the fiber of Example 4, is a side-by-side type conjugate fiber.
- the water absorption rate is 1350%
- the water retention rate is 425%
- the fineness is 4. It had a denier of 87 and a dry strength of 0.92 gZd. Since the fiber of Example 5 has a higher concentration of polyacrylate in the spinning dope A than the fiber of Example 4, it is believed that both the water absorption rate and the water retention rate are higher.
- This conjugate fiber maintained its fiber form in a state containing water, and had no fluidity. In addition, it had enough strength to be pulled out as a single fiber in this state.
- the fiber of Example 6 is a sheath-core composite fiber having a component of the spinning stock solution A in the core and a component of the viscose stock solution B in the sheath.
- the ratio of polyacrylate to total cellulose in the fiber is 10% by weight.
- This composite fiber had a water absorption rate of 1240%, a water retention rate of 472%, a fineness of 4.85 denier, and a dry strength of 1.6 gZd.
- the sheath portion is composed of cellulose alone, it is considered that the water absorption rate and water retention rate are lower than those of the fibers of Examples 4 and 5.
- This fiber is a sheath-core composite fiber, and the ratio of polyacrylate to total cellulose in the fiber is 50% by weight.
- This composite fiber had a water absorption rate of 1270%, a water retention rate of 480%, a fineness of 4.91 denier, and a dry strength of 1.OOgZd.
- the fiber of Example 7 has a higher concentration of polyacrylate in the spinning dope A, so it is considered that both the water absorption rate and the water retention rate are higher.
- This composite fiber maintains its fiber form in a state containing water, and has no fluidity. In this state, it had enough strength to be pulled out as a single fiber.
- Example 7 Similar to Examples 8 to 15, compared to Example 7, which was not treated with an aqueous sodium carbonate solution, Therefore, both water absorption and water retention were excellent.
- the fibers of Examples 20 through 22 are the fibers of Example 5 treated with different alkali-frying solutions. Compared with Example 5, the water retention rate is higher, but the water absorption rate is lower. Moreover, compared with Example 5, there is no great difference in fineness and dry strength.
- Example 20 treated with an aqueous sodium hydroxide solution showed interfiber sticking.
- the fibers of Example 22 treated with the ethanolamine aqueous solution residual odor was observed in the fibers after drying. Therefore, it is considered that the aqueous solution of sodium carbonate is preferable as the liquid for alkali treatment.
- the highly water-retentive fibers of Examples 1 to 22 have a water absorption rate of 700% or more, a water retention rate of 200% or more, a fineness of 4.7 denier or more, and a dry strength of about 1 It is about g Z d, and it can be seen that it satisfies the conditions for the high water retention fiber of the present invention.
- the cellulose-based highly water-retaining fiber of the present invention maintains its fibrous form even when absorbing water, compared to the combination of the conventional water-retaining material, fluff pulp, and the powdery water-absorbing polymer, when dry and wet. It has excellent shape retention ability in any state.
- polyacrylate is used as the superabsorbent material in the fibers, the movement of the polyacrylate is restricted by the cellulose fibers, especially even when the polyacrylate swells and becomes gelled. Therefore, even if this highly water-retentive fiber is wrapped in a paper sheet and used as an absorbent for paper diapers, sanitary napkins, pads, etc., there is no sense of discomfort when worn.
- the highly water-retentive fiber of the present invention can form a sheet only from this fiber, and this sheet can be used as an absorbent body. Alternatively, it can be blended with existing Super Absorbent Polymers (SAP) or Pulp fibers and sheets can be formed from this blend. For this reason, it is possible to manufacture a highly water-absorbent and thin absorbent body, and the shape retention power as a sheet is further enhanced.
- the highly water-retentive fiber of the present invention has an absorption rate of 700% or more. Furthermore, it has a water retention rate of 200% or more, and 50 grams of fiber can retain 100 grams or more of water. Therefore, a water-retentive sheet manufactured using this water-retentive fiber as a raw material can be suitably used for absorbent articles such as disposable diapers, sanitary napkins and pads.
- this highly water-retentive fiber has a high fiber strength of about 1 g Zd in a dry state, so it is also excellent in workability.
- the polymer forming the fiber is not a synthetic polymer material such as polyacrylonitrile but cellulose, it decomposes quickly in soil and is easy to treat.
- the equipment for manufacturing the fibers of the present invention is substantially the same as the equipment for manufacturing conventional viscose rayon. Therefore, in order to produce the fibers of the present invention, it is not necessary to prepare a particular device, and the fibers can be produced at low cost.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Artificial Filaments (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Nonwoven Fabrics (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Multicomponent Fibers (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/066,297 US5998025A (en) | 1995-10-30 | 1996-10-30 | Water-retentive cellulose fiber, method of manufacturing the same, and water-retentive sheet comprising cellulose fiber of high water retentivity |
EP96935491A EP0892093B1 (en) | 1995-10-30 | 1996-10-30 | Water retentive cellulose fiber, method of manufacturing the same, and water retentive sheet comprising cellulose fiber of high water retentivity |
US09/387,171 US6221474B1 (en) | 1995-10-30 | 1999-08-31 | Water-retentive sheet manufactured from a cellulose fiber of high water retentivity |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7/305124 | 1995-10-30 | ||
JP30512495A JP3517045B2 (ja) | 1995-10-30 | 1995-10-30 | セルロース−ポリアクリル酸系高保水性繊維、及びその製造法 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/066,297 Continuation US5998025A (en) | 1995-10-30 | 1996-10-30 | Water-retentive cellulose fiber, method of manufacturing the same, and water-retentive sheet comprising cellulose fiber of high water retentivity |
US09/387,172 Division US6248444B1 (en) | 1995-10-30 | 1999-08-31 | Water-retentive cellulose fiber, method of manufacturing the same, and water-retentive sheet comprising cellulose fiber of high water retentivity |
Publications (1)
Publication Number | Publication Date |
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WO1997016586A1 true WO1997016586A1 (en) | 1997-05-09 |
Family
ID=17941392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1996/003171 WO1997016586A1 (en) | 1995-10-30 | 1996-10-30 | Water retentive cellulose fiber, method of manufacturing the same, and water retentive sheet comprising cellulose fiber of high water retentivity |
Country Status (6)
Country | Link |
---|---|
US (5) | US5998025A (ja) |
EP (1) | EP0892093B1 (ja) |
JP (1) | JP3517045B2 (ja) |
KR (1) | KR100398140B1 (ja) |
CN (1) | CN1078635C (ja) |
WO (1) | WO1997016586A1 (ja) |
Cited By (1)
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WO2009036483A1 (en) * | 2007-09-19 | 2009-03-26 | Senevens International Ltd | Non-woven biodegradable hygiene product |
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JP3517045B2 (ja) * | 1995-10-30 | 2004-04-05 | ユニ・チャーム株式会社 | セルロース−ポリアクリル酸系高保水性繊維、及びその製造法 |
US6342298B1 (en) * | 1997-11-19 | 2002-01-29 | Basf Aktiengesellschaft | Multicomponent superabsorbent fibers |
JP3055821U (ja) * | 1998-07-13 | 1999-01-29 | 有限会社藤原興産 | 保温性編地 |
US6398436B1 (en) | 2000-04-12 | 2002-06-04 | International Business Machines Corporation | Spill protection for electronic devices |
US6906131B2 (en) * | 2001-09-17 | 2005-06-14 | Stockhausen Gmbh & Co. Kg | Cellulose material with improved absorbency |
KR100442113B1 (ko) * | 2002-02-27 | 2004-07-30 | 히포메디칼 주식회사 | 셀루로오스 접착용 조성물 및 흡수/흡혈성이 우수한의료용 면패드 |
JP2004261230A (ja) | 2003-02-18 | 2004-09-24 | Uni Charm Corp | 水洗可能な陰唇間パッド |
US20050130540A1 (en) * | 2003-12-15 | 2005-06-16 | Nordson Corporation | Multicomponent spunbond filaments having a melt-processable superabsorbent polymer core |
JP4515182B2 (ja) * | 2004-07-23 | 2010-07-28 | 旭化成せんい株式会社 | セルロース鞘芯繊維およびその製造方法 |
JP2009537258A (ja) * | 2006-05-23 | 2009-10-29 | セネヴェンス インターナショナル ピーティーワイ リミテッド | 使い捨て個人用品 |
RU2419457C2 (ru) * | 2006-12-22 | 2011-05-27 | Ска Хайджин Продактс Аб | Двухкомпонентное сверхабсорбирующее волокно |
US8043700B2 (en) * | 2006-12-22 | 2011-10-25 | Sca Hygiene Products Ab | Bicomponent superabsorbent fibre |
US8584440B2 (en) | 2007-09-07 | 2013-11-19 | Kolon Industries, Inc. | Cellulose-based fiber, and tire cord comprising the same |
CN101666057B (zh) * | 2008-09-04 | 2011-05-18 | 福建恒安集团有限公司 | 一种无尘纸 |
AT508688B8 (de) * | 2009-08-28 | 2011-10-15 | Chemiefaser Lenzing Ag | Carboxyethylcellulosefasern, ihre verwendung in wundverbänden und hygieneartikeln sowie verfahren zu ihrer herstellung |
CN102153703B (zh) * | 2011-03-23 | 2013-06-05 | 浙江理工大学 | 一种纤维素基高吸水保水树脂的制备方法 |
JP2013023643A (ja) * | 2011-07-25 | 2013-02-04 | National Institute For Agro-Environmental Science | 生分解性プラスチック資材の分解を促進する方法 |
WO2013078547A1 (en) | 2011-12-02 | 2013-06-06 | Masdar Institute Of Science And Technology | Cellulose blends with enhanced water retention and their use in irrigation |
CN104452004A (zh) * | 2014-12-09 | 2015-03-25 | 常熟涤纶有限公司 | 弹性好的有色涤纶高强丝 |
JP6826501B2 (ja) * | 2016-06-30 | 2021-02-03 | ダイワボウホールディングス株式会社 | 再生セルロース繊維、それを含む繊維構造物及びそれらの製造方法 |
JP7032076B2 (ja) * | 2017-08-09 | 2022-03-08 | 帝人フロンティア株式会社 | 繊維構造体およびその製造方法 |
CN114717749A (zh) * | 2022-04-19 | 2022-07-08 | 东华大学 | 含有毛刷结构微/纳米纤维的水刺非织造材料及其制备方法 |
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-
1996
- 1996-10-30 KR KR10-1998-0703146A patent/KR100398140B1/ko not_active Expired - Fee Related
- 1996-10-30 WO PCT/JP1996/003171 patent/WO1997016586A1/ja active IP Right Grant
- 1996-10-30 US US09/066,297 patent/US5998025A/en not_active Expired - Lifetime
- 1996-10-30 CN CN96199106A patent/CN1078635C/zh not_active Expired - Fee Related
- 1996-10-30 EP EP96935491A patent/EP0892093B1/en not_active Expired - Lifetime
-
1999
- 1999-08-31 US US09/387,171 patent/US6221474B1/en not_active Expired - Lifetime
- 1999-08-31 US US09/387,172 patent/US6248444B1/en not_active Expired - Lifetime
-
2000
- 2000-03-17 US US09/528,281 patent/US6436325B1/en not_active Expired - Fee Related
- 2000-06-07 US US09/589,375 patent/US6187436B1/en not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
---|---|
US6221474B1 (en) | 2001-04-24 |
CN1078635C (zh) | 2002-01-30 |
JPH09132814A (ja) | 1997-05-20 |
US6187436B1 (en) | 2001-02-13 |
KR100398140B1 (ko) | 2003-12-31 |
US5998025A (en) | 1999-12-07 |
US6436325B1 (en) | 2002-08-20 |
US6248444B1 (en) | 2001-06-19 |
JP3517045B2 (ja) | 2004-04-05 |
KR19990067195A (ko) | 1999-08-16 |
EP0892093A1 (en) | 1999-01-20 |
EP0892093A4 (en) | 1999-10-13 |
EP0892093B1 (en) | 2002-12-11 |
CN1205747A (zh) | 1999-01-20 |
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