WO2006018969A1

WO2006018969A1 - Multilayer sheet

Info

Publication number: WO2006018969A1
Application number: PCT/JP2005/014103
Authority: WO
Inventors: Takashi Katayama; Ryuji Kawakami; Kazuhiko Tanaka; Masao Kawamoto; Toshimitsu Harada
Original assignee: Kuraray Co., Ltd.
Priority date: 2004-08-02
Filing date: 2005-08-02
Publication date: 2006-02-23
Also published as: JPWO2006018969A1; JP4464968B2

Abstract

Disclosed is a multilayer sheet wherein a second layer composed of fibers containing an ethylene-vinyl alcohol copolymer is formed on at least one side of a first layer composed of cellulose fibers. The second layer may be composed of ethylene-vinyl alcohol copolymer fibers and cellulose fibers, and the mass ratio between them (the former/the latter) may be about 97/3-60/40. In the second layer, the average fineness of the ethylene-vinyl alcohol copolymer fibers may be not more than 0.9 decitex and the average fineness of the cellulose fibers is not more than 1.2 decitex.

Description

Specification

Laminated sheet

Technical field

[0001] The present invention relates to a multilayered (laminated) sheet that is suitable for a fiber sheet for cosmetics and body fluid absorption typified by a face mask, that is gentle to the skin and that is excellent in liquid absorption along the skin. To do.

Background art

[0002] Conventionally, as a fiber sheet for absorbing body fluids such as cosmetics represented by face masks, napkins, diapers, diaper liners, wet tissues, etc., cotton-based The material is widely used. However, despite the fact that cotton is a natural material, due to its shape and hardness, when it comes into contact with the skin, some people may experience rashes or itchiness or damage the skin. Furthermore, the face mask is a fiber sheet cut into a face shape, and is used for expressing a cosmetic effect by being in close contact with the face and leaving for a while. When a cotton sheet is used as such a face mask, the tendency is remarkable on both sides of the nose, especially when the face mask is difficult to follow along the skin.

[0003] As a skin care sheet or makeup sheet to be brought into contact with the skin, for example, Japanese Patent Application Laid-Open No. 2003-95861 (Patent Document 1) has a cross-sectional height of 0.1 to 5 mm and a cross-sectional area of 0. A skin care sheet composed of spun lace nonwoven fabric with a convex of 01-20 Omm ² has been proposed. In this document, as spunlace nonwoven fabric, it is composed of non-norp fibers such as synthetic fibers or fibers combining synthetic fibers with rayon or cotton, and composed of ultrafine fibers with a fineness of 0.01 to 5.5 dtex. Nonwoven fabric is described. However, this sheet causes skin irritation and itching.

[0004] JP 2003-93152 A (Patent Document 2) discloses an inner layer composed of a fiber assembly mainly composed of a hydrophobic component and upper and lower layers composed of a fiber assembly composed mainly of a hydrophilic fiber. A sheet in which a cosmetic material is impregnated in an assembly having a structure of at least three layers composed of outer layers is described. In this document, polyolefin fibers are used as hydrophobic fibers constituting the inner layer. Examples include fibers, polyester fibers, polyamide fibers, polyacrylonitrile fibers, and polyvinyl alcohol fibers. The hydrophilic fibers that make up the outer layer are composed of cellulose fibers with a hydrophilic functional group, alginate fibers, collagen fibers, etc. Illustrated are the ultrafine fibers made. However, even with this sheet, irritation to the skin is strong and itching and itching occur.

Patent Document 1: Japanese Patent Application Laid-Open No. 2003-95861 (Claim 1, paragraph numbers [0004] [0005] [0016] [0028], Tables 1 and 2)

Patent Document 2: Japanese Patent Laid-Open No. 2003-93152 (Claim 1, Paragraph Nos. [0011] [0012] [0015]) DISCLOSURE OF THE INVENTION

Problems to be solved by the invention

[0005] An object of the present invention is to provide a sheet excellent in biocompatibility and its use, which does not cause itching or rash even when it comes into contact with the skin.

[0006] Another object of the present invention is to provide a sheet having high liquid absorbability and having high adhesion to an uneven body surface such as a nose and its use.

[0007] Still another object of the present invention is to provide a sheet having a relaxing effect on a human body having a good touch and use thereof.

Means for solving the problem

[0008] As a result of intensive investigations to achieve the above-mentioned problems, the present inventors have found that a layer composed of fibers containing an ethylene-vinyl alcohol copolymer (ethylene-vinyl alcohol copolymer-containing fiber) and The present invention has been completed by discovering that a sheet combined with a layer composed of cellulosic fibers has high liquid absorbency and high biocompatibility to the skin.

That is, the laminated sheet of the present invention has a second layer composed of fibers containing an ethylene butyl alcohol copolymer on at least one surface of the first layer composed of cellulosic fibers. In the laminated sheet, the fiber containing an ethylene butyl alcohol copolymer is a fiber having at least a surface composed of an ethylene butyl alcohol copolymer. The fiber containing the ethylene butyl alcohol copolymer may be an ethylene butyl alcohol copolymer fiber having an average fineness of 0.9 dtex or less. Yes. The cellulosic fiber may be rayon fiber. Furthermore, the second layer is composed of ethylene vinyl alcohol copolymer fiber and cellulose fiber, and the ratio (mass ratio) of the two is the former Z latter = 97Z3-60Z40 (especially 95Z5-70Z30) It may be a degree. In the second layer, the ethylene-but-alcohol-based copolymer fiber may have an average fineness of 0.9 dtex or less, and the cellulosic fiber may have an average fineness of 1.2 dtex or less. In particular, in this laminated sheet, the second layer may be formed on both sides of the first layer. This laminated sheet may be composed of a wet nonwoven fabric. In the first layer, a rayon fiber having a cellulosic fiber strength average fineness of 1.2 decitus or less may be used. This laminated sheet may have a water absorption rate of 200% or more. Since this laminated sheet is excellent in touch and biocompatibility, it may be used as a sheet that can come into contact with the skin.

[0010] The present invention also includes a face mask sheet composed of the laminated sheet. Also

The present invention also includes a body fluid absorbing sheet composed of the laminated sheet.

The invention's effect

[0011] In the present invention, since a layer composed of cellulosic fibers and a layer composed of fibers containing an ethylene butyl alcohol copolymer on the surface are combined, It does not cause itchiness or rash and has excellent biocompatibility. In addition, it has high liquid absorbency and high adhesion to uneven surfaces of the human body such as the nose. In addition, it has a relaxing effect on the human body that has a good touch. Therefore, such a laminated sheet is suitable for a sheet that can come into contact with the skin, in particular, a face mask sheet or a body fluid absorbing sheet.

Detailed Description of the Invention

[0012] The laminated sheet of the present invention is a second sheet composed of fibers (EVOH-containing fibers) containing an ethylene butyl alcohol copolymer on at least one surface of the first layer composed of cellulosic fibers. A layer is formed.

[0013] [First layer]

In the laminated sheet of the present invention, the first layer is formed in order to improve liquid absorbency. In the first layer, cellulosic fibers include cellulose or its derivatives (e.g. For example, ananolenoresenololose etherol such as methinoresenorelose, hydroxyalkyl cellulose ether such as hydroxymethinoresenorose, canolexoxynoresenorelose etherol such as carboxymethylcellulose, senorelose acetate, etc. The fiber is not particularly limited as long as it is a fiber composed of senorelose esterol or the like, and may be a natural fiber or an artificial fiber. Examples of natural fibers include seed hair fibers such as cotton and kapok, bast fibers such as flax, cannabis, jute and ramie, and leaf vein fibers such as manila hemp and sisal hemp. Examples of artificial fibers include regenerated fibers such as rayon fibers and semi-synthetic fibers such as acetate fibers. These cellulosic fibers can be used alone or in combination of two or more. Of these cellulosic fibers, rayon fibers such as viscose rayon, copper ammonia rayon (Cubra), polynosic, and lyocell (for example, registered trade name: “Tencel”) are preferable.

The first layer may further contain other fibers. Other fibers include other natural fibers, other artificial (synthetic) fibers, inorganic fibers, and the like. Examples of other natural fibers include wool (wool) and silk. Other synthetic fibers include, for example, polyamide fibers (for example, polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, polyamide 612, and other aliphatic polyamide fibers, alicyclic polyamide fibers, and poly -Aromatic polyamide fibers such as lenisophthalamide, polyhexamethylene terephthalamide, poly p-phenylene-terephthalamide), polyolefin fibers (for example, poly C polyolefin fibers such as polyethylene and polypropylene), Polyester fiber (for example, poly

2-4

(Ethylene terephthalate, polypropylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, aromatic polyester fiber such as polyethylene naphthalate, aliphatic polyester fiber such as polylactic acid, etc.), polybutyl alcohol fiber, ethylene-butyl alcohol Polymer fiber, acrylic fiber (for example, acrylonitrile fiber having acrylonitrile unit such as Atari Mouth-Tolulu salt-bulb copolymer, etc.), polysalt-bulb fiber (for example, polyvinyl chloride, salt fiber, etc.)匕 Bul acetate acetate copolymer, salt 匕 bulu-acrylonitrile copolymer fiber, etc., polysalt-vinylidene-based fiber (eg, salt-vinylidene monosalt-vinyl copolymer fiber, salt匕 Biurydene monoacetate copolymer fiber etc.) Etc., and the like. Examples of inorganic fibers include glass fibers and charcoal. Examples thereof include elemental fibers and metal fibers. These other fibers can be used alone or in combination of two or more.

[0015] Among these other fibers, from the viewpoints of adhesion to the second layer and biocompatibility, EVOH-containing fibers constituting the second layer are preferred for sheet properties and water absorption. Therefore, a polyester fiber (especially hydrophilic polyester fiber) is preferable. The hydrophilic polyester fiber may be a fiber composed of a polyester resin into which hydrophilic units (for example, polyoxyethylene group, sulfonic acid group, amino group, etc.) are introduced.

[0016] The ratio (mass ratio) between the cellulosic fiber and the other fiber is the cellulosic fiber Z other fiber.

Can be selected from the range of about 100 ZO to 50 Z50, for example, cellulosic fibers Ζ other fibers = 100 Ζ 0 to 60 Ζ 40, preferably 100 ZO to 70 Z 30 (e.g. 99/1 to 70/3 0), more preferably 100 Ζ 0 to 80 Ζ 20 ( For example, it may be about 95Ζ5 to 80Ζ20).

[0017] The average fineness of the cellulosic fibers and other fibers is not particularly limited. From the viewpoint of flexibility and liquid retention, for example, the average fineness is not more than 5.5 dtex (for example, 0.1 to (5 decitex) fine fibers. Specifically, the average fineness is, for example, 3.3 dtex or less (for example, about 0.1 to 3.3 dtex), preferably 1.2 dtex or less (for example, 0.1 to 1.2 dtex). Degree), more preferably 1.1 decitex or less (for example, about 0.1 to 1.1 decitex). If the average fineness is too large, the touch and liquid absorbency are reduced, and fibers with a density of less than 0.1 dtex are difficult to manufacture.

[0018] The shapes of the cellulose fiber and other fibers may be circular cross-sections, even if they are circular cross-sections perpendicular to the length direction, and irregular cross-sections (for example, elliptical cross-sections, polygons such as tri-octagons). It may be a shape cross-section, a cross-section, a cross-section, a C-section, etc. Further, these fibers are not particularly limited in fiber length, and may be staple fibers or filament fibers. Furthermore, these fibers may be shortcut fibers such as those used as a raw material for paper, but the average fiber length is usually 1 mm or more. The fiber length of these fibers may be selected according to the layer production method.For example, when forming a nonwoven fabric by a wet method, the average fiber length is, for example, about 1 to 30 mm (particularly 2 to 20 mm). May be. In addition, when forming a nonwoven fabric by a dry method such as the card method or air lay method, the average fiber length May be, for example, about 10 to 70 mm (particularly 20 to 60 mm). Further, when these fibers are spunbonded nonwoven fabrics, they may be endless long fibers. In particular, in the present invention, the average fiber length may be, for example, about 1 to 20 mm, preferably 3 to 15 mm, and more preferably about 3 to LOmm! / ヽ.

[0019] The method for producing the cellulosic fiber and other fibers is appropriately selected depending on the type of the fiber, and is not particularly limited, and a conventional method can be used. For example, in the case of rayon fiber, it can usually be produced by a wet spinning method.

[0020] The form of the first layer composed of such fibers may be a woven or knitted fabric or a non-woven fabric, but a non-woven fabric is preferred from the standpoints of rigidity and economy. The nonwoven fabric may be either a dry nonwoven fabric or a wet nonwoven fabric, but a wet nonwoven fabric is preferred from the viewpoint of interlayer adhesion in the laminated sheet. Details of the manufacturing method of the first layer (fiber web) will be described later.

[0021] In the first layer, a stabilizer (a heat stabilizer such as a copper compound, an ultraviolet absorber, a light stabilizer, an antioxidant, etc.) is optionally added within a range not impairing the object and effect of the present invention. In addition, additives such as fine particles, colorants, antistatic agents, flame retardants, plasticizers, lubricants, crystallization rate retarders and the like may be contained. These additives can be used alone or in combination of two or more. These additives can be added during the production of the fiber or in subsequent steps.

[0022] For the basis weight of the first layer, for example, a range force of about 5 to: LOOgZm ² can be selected, and particularly from the viewpoint of sufficiently maintaining water absorption and imparting flexibility to the sheet, preferably 10 to 60 gZm ² More preferably, it is about 12 to 40 g / m ² .

[0023] [Second layer]

For example, a fiber containing an ethylene butyl alcohol copolymer (EVOH-containing fiber) can be obtained by saponifying a copolymer of ethylene and butyl ester. it can. The proportion of ethylene can be selected in the range of about 5 to 70 mol% in the copolymer, and is preferably about 20 to 65 mol% from the viewpoint of hydrophilicity and melt spinnability. Further, the proportion of ethylene is preferably 25 to 60 mol% from the viewpoint of maintaining hydrophilicity while suppressing problems on melt spinning due to deterioration of the staying resin. Preferably the al is 27-55 mole ^_0/0 (especially 32-51 mole ^_0/0) of about. If the proportion of ethylene is too large, the hydrophilicity of the resulting fiber will be insufficient and biocompatibility will deteriorate. On the other hand, when the proportion of ethylene is too small, melt spinnability deteriorates and biocompatibility also deteriorates.

[0024] The saponification degree of the bull ester component can be selected from the range of 80 mol% or more (for example, about 80 to 99.99%), and preferably 90 mol% or more (for example, from the viewpoint of hydrophilicity and melt spinnability) 90 to 99.9%), more preferably 95 mol% or more (for example, about 95 to 99.8%). If the degree of keniness is too low, the hydrophilicity, thermal stability, and heat resistance deteriorate.

[0025] Examples of the bull ester component include formate bull, acetic acid bull, propionate vinyl, valelate bull, force purate bull, laurate bull, stearate bull, vinyl benzoate, bivalate bull, and versa. Examples include tick acid bull. These bule ester components can be used alone or in combination of two or more. Of these, lower aliphatic carboxylic acid butyls such as butyl acetate and propionate are preferred, and butyl acetate is usually used. Butyl acetate may be used in combination with other bull esters (such as propionate and bivalerate).

[0026] The ethylene butyl alcohol copolymer further contains a bursilan compound as a copolymer component up to about 0.2 mol% in the copolymer, for example, 0.0002-0. 2 mol% (in particular, 0. 0005-0. 1 mole ^_0/0) may contain extent. Here, examples of the vinylsilane compound include alkoxysilane compounds having a polymerizable unsaturated bond (such as a vinyl group, an aryl group, and a (meth) atalyloyl group), such as butyltrimethoxysilane and vinyltriethoxysilane. And butylalkoxysilanes such as butyltri (j8-methoxymonoethoxy) silane, and γ-methacryloyloxypropylmethoxysilane. These bursilane compounds can be used alone or in combination of two or more. Of these, butyltrimethoxysilane and butyltriethoxysilane are preferred.

[0027] The melt viscosity of the ethylene butyl alcohol copolymer is important from the viewpoint of stably producing fibers. Specifically, the MFR (measured at 190 ° C under a load of 2160g (approximately 21.2N)) of ethylene butyl alcohol copolymer is a force that varies within its preferred range depending on the type of processing equipment. ˜500 g / 10 minutes, preferably ί or 0.1 to 300 g / 10 minutes, more preferably about 1 to 200 gZlO minutes (particularly 5 to LOOgZlO minutes). MFR is too small If the MFR is too high, the fiber tension during melt spinning is too low and troubles such as yarn breakage are likely to occur.

[0028] In the present invention, the EVOH-containing fiber is a fiber having at least a surface composed of an ethylene butyl alcohol copolymer, for example, a fiber composed of an ethylene vinyl alcohol copolymer alone (ethylene butyl alcohol based fiber). Copolymer fibers), and composite fibers composed of ethylene-bulcoalcohol copolymers and other synthetic resins are preferred.

[0029] Examples of other synthetic resins in the composite fiber include the synthetic resins exemplified in the section of the synthetic fiber in the first layer. Of these synthetic fibers, polyolefin-based resin, polyamide-based resin, polyester-based resin and the like can be suitably used. Of these, aromatic polyester fibers (especially polyethylene terephthalate fibers and poly (C) alkylene acrylate fibers such as polybutylene terephthalate fibers are preferred in terms of sheet characteristics and versatility.

2-4

) Is preferred. Poly C alkylene acrylate fiber is a modified poly C

2-4 2-4 Cyanarylate fiber may be used. Modified poly C alkylene arylates are for example

2-4

In addition to terephthalic acid and Z or 2, 6 naphthalenedicarboxylic acid, other aromatic dicarboxylic acids (eg, isophthalic acid, 5-sodiumsulfoisophthalic acid), aliphatic dicarboxylic acids ( For example, it may be a poly C alkylene arylate obtained by copolymerizing a copolymer component such as sebacic acid or adipic acid. These co-weights

2-4

The proportion of the synthetic component is about 50 mol% or less in rosin, preferably about 0.1 to 30 mol%, more preferably about 0.5 to 20 mol% (especially 1 to 10 mol%). .

[0030] From the viewpoint of compatibility with the skin and the like, the surface of the composite fiber is composed of at least an ethylene-butyl alcohol copolymer. Further, as the composite fiber, a fiber in which most of the fiber surface (for example, 70% or more) is composed of an ethylene butyl alcohol copolymer is preferable, and the entire surface of the fiber is composed of an ethylene butyl alcohol copolymer. Particularly preferred are the finished fibers. The structure of the composite fiber is, for example, a core-sheath type, a sea-island type, a side-by-side type (multilayer type), a mandarin orange cross-sectional type, or a fan type (radially alternately) in a cross-sectional shape in a direction perpendicular to the length direction. (Arranged type) structure. Of these structures, the entire surface of the fiber is an ethylene vinyl alcohol copolymer. A core-sheath type composite fiber that is composed of a body and whose sheath component is an ethylene vinyl alcohol copolymer fiber is preferable.

[0031] Since the ethylene vinyl alcohol copolymer is low in stability against hot water, there is usually a method of increasing the hot water resistance by converting the ethylene vinyl alcohol copolymer to acetal or formal after fibrosis. Used. However, in the present invention, from the viewpoint of compatibility with the skin, it is acetalized or formalized! /, Na! /, And fiber is preferred! /.

[0032] Among these EVOH-containing fibers, fibers composed of an ethylene butyl alcohol copolymer alone (ethylene butyl alcohol copolymer fibers) are preferred. Ethylene-bulcoalcohol-based copolymer fibers are exposed to fibers other than ethylene-bulualcohol-based copolymers in the fiber manufacturing process and non-woven fabric manufacturing process even if force is applied to the fiber surface. Therefore, it has high biocompatibility. Furthermore, the method for producing the fiber is also simple.

[0033] The average fineness of EVOH-containing fibers is not particularly limited. From the viewpoint of wrinkle flexibility, texture, liquid retention, etc., for example, 5.5 decitex or less (for example, 0.1-5. It may be a thin fiber (about 5 decitex). Specifically, for example, 3.3 dtex or less (for example, about 0.1 to 3.3 dtex), preferably 1.1 dtex or less (for example, about 0.1 to 1.1 dtex), more preferably 0.9 decitex or less (for example, about 0.1 to 0.9 decitex). If the average fineness is too large, the touch and liquid absorbency are reduced, and fibers with a density of less than 0.1 decitex are difficult to manufacture.

[0034] The shape of the EVOH-containing fiber (the shape of the entire fiber) may be an irregular cross-section (for example, an elliptical cross-section, a tri-octagonal cross-section) in a direction perpendicular to the fiber length direction. Polygonal cross section, T-shaped cross section, Y-shaped cross section, C-shaped cross section, etc.). The EVOH-containing fiber is not particularly limited in fiber length, and may be a stable fiber or a filament fiber. Sarakuko and EVOH-containing fibers may be shortcut fibers such as those used as raw materials for paper, but the average fiber length is usually 1 mm or more. The fiber length of EVOH-containing fibers may be selected according to the layer production method.For example, when forming a nonwoven fabric by a wet method, the average fiber length is, for example, about 1 to 30 mm (especially 2 to 20 mm). There may be. Also, non-woven fabric is formed by dry methods such as the card method and air lay method. In this case, the average fiber length may be, for example, about 10 to 70 mm (particularly 20 to 60 mm). Further, the EVOH-containing fiber may be an endless long fiber in the case of a spunbond nonwoven fabric. In particular, in the present invention, the average fiber length is, for example, from 1 to 20 mm, preferably from 3 to 15 mm, and more preferably from 3 to It may be a degree.

[0035] As a method for producing the EVOH-containing fiber, a conventional melt spinning method, for example, a conventional single spinning method or a composite spinning method can be used. For example, in the case of producing a composite fiber composed of an ethylene vinyl alcohol copolymer and another synthetic resin in the composite spinning method, the ethylene vinyl alcohol copolymer and the other synthetic resin, After melt-kneading with another extruder and subsequently guiding both polymers to the spinning head, they may be discharged from the same spinning nozzle. In this method, a mixture of an ethylene vinyl alcohol copolymer and a plurality of other synthetic resins may be used in advance as one of the composite components.

[0036] EVOH-containing fibers are usually used after being drawn. The drawing method may be a one-step method in which the fiber discharged from the nozzle during spinning is drawn by a godet roller and drawn between hot godet rolls! A two-step method of hot stretching may be used.

[0037] The EVOH-containing fiber may contain the additive exemplified in the first layer, if necessary. These additives can be used alone or in combination of two or more. These additives can also be added during the production of the fiber or in subsequent steps. In particular, in the case of EVOH-containing fibers, it is preferable to add a trace amount of acid or a metal salt thereof to the ethylene butyl alcohol copolymer in order to suppress thermal degradation during melt molding. Examples of the acid include fatty acids such as acetic acid and inorganic acids such as phosphoric acid. Examples of the metal salt include alkali metal salts and alkaline earth metal salts.

[0038] The second layer may further contain other fibers. Other fibers include natural fibers exemplified in the first layer, other artificial (synthetic) fibers (excluding ethylene vinyl alcohol copolymer fibers), inorganic fibers, and the like. Of these other fibers, aliphatic polyamide fibers, polyolefin fibers, cellulosic fibers, and polyester fibers are preferred. Good. Among these, from the viewpoint of controlling the absorption and release properties of the aqueous liquid, cell-mouth fibers (especially artificial fibers such as rayon fibers) are preferable. When cell mouth type fibers (rayon fibers) are used as other fibers, cellulosic fibers in EVOH-containing fibers are separated from the outer surface of the second layer (such as the contact surface with the skin) and the first layer. The aqueous liquid can be guided to the inside or the outside of the second layer. Therefore, for example, when the second layer of a laminated sheet containing an aqueous component such as cosmetic water in the first layer is brought into contact with the skin surface, the cellulosic fiber strength in the EVOH-containing fiber is applied to the first layer. The absorbed makeup water can be guided to the skin surface through the second layer, and body fluid on the skin surface can be guided from the second layer to the first layer. Therefore, the laminated sheet of the present invention is suitable for uses (face masks, etc.) for absorbing liquids such as body fluids and lotions. Furthermore, when the same type (especially the same) cellulosic fiber as the cellulosic fiber in the first layer is used as the cellulosic fiber, when the first layer and the second layer contact, Improves.

[0039] The average fineness of other fibers is not particularly limited. However, from the viewpoint of flexibility, texture, liquid retention, etc., for example, 5.5 decitex or less (for example, 0.1 to 5.5). It may be a thin fiber (about decitex). Specifically, for example, 3.3 dtex or less (for example, about 0.1 to 3.3 dtex), preferably 1.2 dtex or less (for example, about 0.1 to 1.2 dtex), more preferably Is 1.1 decitex or less (for example, about 0.1 to 1.1 decitex). If the average fineness is too large, the touch and liquid absorbency will be reduced, and fibers with less than 0.1 dtex will be difficult to produce.

[0040] Other fiber shapes and fiber lengths are the same as those of the EVOH-containing fiber. In addition, the additives exemplified in the first layer may be contained in other fibers as necessary.

[0041] The ratio (mass ratio) of EVOH-containing fibers and other fibers (particularly cellulosic fibers) can be selected from the range of EV OH-containing fibers Z other fibers = about 100Z0 to 50Z50, for example, Ε VOH-containing Fiber Ζ Other fiber = 100Ζ0 to 60Ζ40, preferably 99Zl to 70Z30, more preferably about 97Ζ3 to 80Ζ20 (especially 95Ζ5 to 85Ζ15). In particular, when EVOH-containing fibers such as ethylene butyl alcohol copolymer fibers and cellulose fibers such as rayon fibers are combined in this ratio, skin irritation is reduced and lotion is added to the first layer. Including an aqueous component such as is contained in the first layer Can be constantly supplied to the skin surface.

[0042] The form of the second layer composed of such fibers may be woven / knitted fabric or non-woven fabric! / Wrinkle, but the nonwoven fabric is used from the viewpoint of ease of touching the human body and economy. preferable. The nonwoven fabric may be either a dry nonwoven fabric or a wet nonwoven fabric, but a wet nonwoven fabric is preferred from the viewpoint of high adhesion between laminated sheets. In addition, when the nonwoven fabric is composed of EVOH-containing fibers and other fibers (such as cell-based fibers), wet nonwoven fabrics can mix both fibers more uniformly than dry nonwoven fabrics.

[0043] The second layer is prepared in advance, such as a dry nonwoven fabric method or a wet nonwoven fabric method, in which a sheet may be produced directly from the production of fibers, such as a melt blown method or a spun bond method. A fiber layer may be produced from the obtained fiber cover. In the case of the spunbond method, it is drawn at the time of fiberization, whereas in the case of the melt blown method, it is hardly drawn at the time of fiberization. A layer (sheet) is obtained. Details of the method for producing the second layer (fiber web) will be described later.

The basis weight of the second layer is, for example, about 5 to: LOOgZm ² , preferably about 8 to 60 gZm ² , and more preferably about 10 to 40 gZm ² .

[0045] [Laminated sheet]

The laminate (multilayer structure) sheet of the present invention is a laminate sheet having a two-layer structure in which a second layer is formed on one side of the first layer, and is formed of at least a first layer and a second layer. However, it may be a laminated sheet having three or more layers including the first layer and the second layer. As a laminated sheet having three or more layers, for example, a laminated sheet in which the second layer is formed on one surface of the first layer and the third layer is formed on the other surface, A sheet in which the second layer is formed on both sides of the layer, a laminate sheet in which the second layer is formed on both sides of the laminate of the first layer and the third layer, and on both sides of the third layer. Examples include a laminated sheet in which a second layer is further formed on both sides of the laminate in which the first layer is formed. Examples of the fibers constituting the third layer include fibers different from those constituting the first and second layers among the fibers exemplified in the section of the first layer.

[0046] Among these laminated sheets, the sheet in which the first layer and the second layer are in contact with each other from the viewpoint of productivity, that is, the second layer is formed on one side of the first layer. Laminated sheet of the first layer A laminated sheet in which the second layer is formed on both sides is preferable. In addition, since the first layer and the second layer are in direct contact with each other, when the first layer contains an aqueous solution such as lotion (eg, lotion), the first layer is retained. The aqueous solution (such as skin lotion) is continuously released to the second layer (surface layer), giving moisturizing and refreshing feeling to the human skin.

[0047] Furthermore, from the viewpoint that the touch and the biocompatibility with the skin can be surely exhibited, the laminated sheet in which the second layer is formed on both surfaces of the first layer, that is, the cellulose-based fiber is used. A laminated sheet having a three-layer structure in which the first layer is the inner layer and the second layer composed of EVOH-containing fibers is formed on both surfaces (that is, the front surface and the back surface) is particularly preferable. Such a laminated sheet is particularly preferable as a face mask sheet because both front and back surfaces can be used as surfaces that contact the human body.

[0048] In the laminated sheet of the present invention, each layer (the first layer and the second layer) needs to be formed into a single body, and each layer is formed as an integrated method. Add one binder fiber as a part of the fiber in advance and combine the binder fiber as an adhesive, bond each layer with an adhesive, and entangle the layers together Examples thereof include a method of bonding by thermocompression bonding with an embossing roll, and a method of integrating with a sewing thread. Among these methods, a method of integrating by entanglement treatment is preferable in that flexibility can be imparted to the resulting laminated sheet. As the entanglement treatment, for example, a method of applying a high-pressure water flow to a laminated web in which a fiber web for a first layer and a fiber web for a second layer are superimposed, or the laminated web is integrated with a needle punch. However, the method of applying a high-pressure water stream and integrating them is particularly preferred because a very flexible sheet can be obtained despite its low basis weight.

[0049] Note that examples of the method for forming the fiber web constituting each layer include a dry method such as a card method and an air method, a wet method such as a papermaking method, a spun bond method, and a melt blown method. Among the fiber webs obtained by these methods, for example, the web obtained by the wet spunlace method has a fine and uniform surface state and has a soft texture, so it feels excellent when touching the skin. . In addition, since the web obtained by the melt blown method is composed of ultrafine fibers, soft skin and web gentle to the skin can be obtained. Among these methods, the wet method such as the papermaking method is preferable. It is particularly preferred to be used in combination with the integrated method. That is, a preferable method is a method in which a laminate is prepared by a wet sheeting method and then integrated by applying a high-pressure water stream. By using this method, a flexible laminate sheet with a low basis weight can be obtained. further

When the first layer of this laminated sheet is impregnated with lotion, the lotion impregnated in the first layer continuously moves slowly to the second layer, which is extremely excellent as a face mask sheet. It becomes a laminated sheet.

[0050] In such a method, a laminated sheet composed of a wet nonwoven fabric is obtained. Therefore, in the method for producing a laminated sheet of the present invention, a preferred embodiment (second layer—first layer: a laminated sheet obtained by applying a high-pressure water stream to a wet nonwoven fabric of a three-layered structure composed of a second layer) Specifically, the EVOH-containing fibers for the second layer (surface layer) are made up and contain water at the stage where the paper is made. The cellulosic fiber layer for the first layer containing water was stacked, and the EVOH-containing fiber layer for the second layer (back layer) containing water at the stage of drawing was stacked on the surface. Then, it is a method for producing a laminated sheet by uniting with a high-pressure water stream. By using such a method (the so-called “combining” t method), the fibers of the first layer and the fibers of the second layer are mixed at the interface, and the first layer contains lotion. When an aqueous solution such as the above is contained, the skin lotion contained in the first layer easily passes through the second layer and moves to the surface. In addition, in the case of wet non-woven fabrics, fluff fibers (eg EVOH-containing fibers and Z or cellulosic fibers) present at the interface between the first layer and the second layer help to move the aqueous solution between the two layers. It becomes.

[0051] And, as a method of forming a fiber web by a wet method, the papermaking method is generally used. However, the papermaking method uses a single device in which the production speed is faster than other methods, and multiple fibers with different fiber diameters are used. There is an advantage that various kinds of fibers can be mixed at an arbitrary ratio. In other words, the fiber has a wide range of choices, such as staple-like force, pulp-like, and can be used up to ultra-fine fiber strength, thick fiber, even with a fiber diameter. can get.

[0052] Further, in the papermaking method, first, fibers obtained by melt spinning are cut and dispersed in water, and under gentle stirring, a uniform papermaking slurry is obtained. This is a method of making paper using a paper machine with at least one of the inclined type wires. The Further, the wet paper obtained by such a method or the paper after drying may be entangled with the paper by applying the paper alone or in a laminated state. Furthermore, when making paper, the cut fibers may be added with a sticky agent or a dispersing agent during paper making after being beaten with a beater or refiner, etc. .

[0053] The laminated sheet of the present invention has a water absorption rate of 200% or more (for example, 200 to 1500%), preferably 300% or more (for example, 300 to 1500%), more preferably 400% or more (for example, 400 to 400%). 1500%). In the case where only the surface layer composed of EVOH-containing fibers is strong, such a water absorption rate cannot usually be satisfied. In order to increase the water absorption rate, the proportion of the first layer in the laminated sheet may be increased.

[0054] The laminated sheet of the present invention can be appropriately hydrophilized and hydrophobized as necessary. Examples of the hydrophilization treatment method include graft polymerization treatment, plasma discharge treatment, corona discharge treatment, fluorine gas treatment, resin coating treatment, hydrophilic surfactant treatment, and sulfone treatment.

[0055] The basis weight of the laminated sheet of the present invention is, for example, 20 to 20 from the viewpoint of adhesion to the skin and liquid absorbency.

A 200GZm ² mm, in particular, when used as a sheet for a face mask, preferably 30: a LOOgZm ^2, more preferably 40～80GZm ² about.

Industrial applicability

[0056] Since the laminated sheet of the present invention has high biocompatibility to the skin, it is used for direct contact with the skin, for example, cosmetics represented by face masks, surface materials such as napkins and diapers, diaper liners, It can be used for a body fluid absorbing sheet (or a skin cleaning sheet) such as a wet tissue. In particular, the laminated sheet of the present invention is particularly suitable for a face mask sheet because of its high liquid-absorbing property and high adhesion to an uneven human surface. When the laminated sheet of the present invention is used as a face mask, the laminated sheet is cut out to fit the face and impregnated with an appropriate amount of an aqueous solution in which one component of skin care (hyaluronic acid, collagen, vitamins, etc.) is dissolved or dispersed. To obtain.

Example

[0057] The present invention will be described below with reference to examples, but the present invention is not limited to the examples. In addition, each measured value in the examples is a value measured by the following method. The

[0058] [Fiber fineness]

Measured according to JIS L1013.

[Sheet thickness (mm)]

Measured according to JIS P 8118 “Test method for thickness and density of paper and board”.

[0059] [Sheet weight (gZm ² )]

The basis weight of the sheet was measured according to JIS P 8124 “Measuring method of metric basis weight of paper”.

[0060] [Water content of sheet (%)]

A sheet sample cut into a 10 cm square was immersed in distilled water for 2 hours and then drained for 10 seconds. The weight of the specimen before treatment is W and the weight of the specimen after treatment is W.

0 1

The water content (%) was calculated.

[0061] Moisture content (%) = (W -W) / W X 100

1 0 0

Example 1

Ethylene Bulle alcohol copolymer fiber (manufactured by Kuraray Co., Ltd., S030, 0. 7 Deshitetsu task X 5 mm) 90 Weight ^_0/0, rayon fibers (Daiwabo Co., Corona SB, 1. 1 Deshite box X 7mm) is mixed to 10% by weight, and the papermaking slurry is introduced into the first and third tanks of a three-tank machine paper machine, and 100% by weight of the rayon fiber is introduced into the second tank. It was. The front and back layers (second layer) are composed of 90% by weight of ethylene butyl alcohol copolymer fibers and 10% by weight of rayon fibers, and the inner layer (first layer) is 100% by weight of rayon. It was made up of 3 layers with the same basis weight. Subsequently, 3 steps of water entanglement treatment of 2MPa, 4MPa and 6MPa was performed, and air-through drying was performed at 60 ° C to obtain a laminated (multi-layer structure) sheet. This laminate sheet had a basis weight of 20 g / m ² on the front and back layers and 20 g / m ^{2 on} the inner layer. Furthermore, this laminated sheet was strong in that the fibers of both layers were entangled at the boundary surface between the front surface layer and the inner layer and the boundary surface between the inner surface and the inner surface of the back surface layer, and peeling occurred at the boundary surface.

[0062] As a result of measuring the moisture content of the obtained sheet, it was 770% and the thickness was 0.44 mm. In addition, this sheet is cut into the shape of the face, holes or cuts are made in the parts corresponding to the eyes, mouth and nose, and the skin is impregnated with 10 lotions of women suffering from atopic dermatitis. Wearing it as a face mask for 10 minutes, a daily wear test was conducted for 10 consecutive days. As a result, all women were rated as cool, relaxed, comfortable, with less or no itching or pain. Furthermore, the face mask adhered to both sides of the nose, making it extremely suitable as a face mask sheet.

[0063] From the above results, it can be seen that the laminated sheet of this example has higher biocompatibility than the cotton spunlace of Comparative Example 1 described later. Some subjects showed no difference from Comparative Example 1, but none of the subjects was worse than Comparative Example 1 in any case. It can also be seen that it is sufficient for applications that retain skin care ingredients, such as face masks with high moisture content.

[0064] Example 2

Using an ethylene butyl alcohol copolymer resin (ethylene content 44 mol, MFR 120 gZlO content), it was blown at a die temperature of 250 ° C to obtain a meltblown nonwoven fabric with a basis weight of about 20 gZm ² The average thickness of the ethylene-bule alcohol fiber constituting the fiber was about 5 m as measured by an electron microscope). Meanwhile, rayon (Daiwabo Co., Corona, 1.7 dtex X 40 mm) 80 Weight ^_0/0, hydrophilic polyester (Teijin Ltd., TT04L, 1.7 dtex X 44 mm) with 20 wt% The web was obtained by carding so that the weight per unit area was about 20 g / m ² . This blended cotton web is laminated in three layers so that the melt blown nonwoven fabric composed of the inner layer and the ethylene bulalcohol-based copolymer resin becomes the front layer and the back layer, and subjected to hydroentanglement treatment, the three-layer structure Got the sheet.

[0065] The water content of this sheet was 860%, and the thickness was 0.33 mm. As a result of performing a wearing test as a face mask in the same manner as in Example 1, it was found to be extremely excellent in adhesion to the skin, as in Example 1, and all the wearing testers were cool and relaxed. We rated it as comfortable. However, in this sheet, when the folded face mask having a lower strength than that of the sheet of Example 1 was spread, the sheet was broken at the portion where the nose was cut.

[0066] In addition, as a result of using a three-layer structure sheet of an example described later as a sheet for covering a heel injured part of an atopic dermatitis patient, it was evaluated that it was excellent in absorbability of body fluid and itching was reduced. Obtained [0067] Example 3

Ethylene butyl alcohol copolymer rosin (manufactured by Kuraray Co., Ltd., Enol El 12BY, ethylene content 44 mol, MFR 12 gZlO content) sheath component, isophthalic acid 8 mol modified poly (ethylene terephthalate) PET containing isophthalic acid units in proportions (Kuraray Co., Ltd., SV760) as the core component, spinning at 280 ° C, dry heat drawing, crimping and cutting at 80 ° C, 1.7 decitex A crimped raw cotton with a core-sheath composite fiber of X 38 mm was obtained. Using this core-sheath composite raw cotton, a web was obtained by carding with a basis weight of about 20 gZm ² . This core-sheath conjugate fiber web is the surface layer, and the web is laminated into three layers so that the mixed cotton web of rayon and hydrophilic polyester used in Example 2 becomes the inner layer, and then the hydroentanglement treatment is performed. A layered sheet was obtained.

[0068] This sheet had a water content of 880% and a thickness of 0.52 mm. Similar to Example 1, when used as a face mask for a woman suffering from athletic dermatitis, although it was inferior in flexibility to that of Example 1, the impression that it was comfortable was obtained. It also had excellent adhesion to the face, and both sides of the nose were also in close contact with the skin.

[0069] Comparative Example 1

A cotton spun lace with a basis weight of 60 g / m ² (manufactured by UCHIKA Co., Ltd., COT ACE, C060S) was cut into a face mask shape and subjected to a wearing test in the same manner as in Example 1. It was terrible. Others showed little improvement in comfort compared to before the test. Also, there were people who complained of discomfort because the skin and face mask did not adhere to both sides of the nose. This sheet had a moisture content of 1200% and a thickness of 0.37 mm.

[0070] Comparative Example 2

Using the crimped raw cotton of the core-sheath composite fiber (1.7 decitex X 38 mm) composed of the ethylene vinyl alcohol copolymer used in Example 3 and isophthalic acid 8 mol-modified polyethylene terephthalate, the basis weight is about 60 g / Carding to m ² gave a wet web. The web of this core-sheath composite fiber was subjected to hydroentanglement treatment to obtain a sheet. Although the thickness of this sheet was 0.48 mm, the moisture content was 100% and the liquid retention was insufficient, and when used as a face mask, the amount of skin water impregnated quickly evaporated and the I couldn't use it as a chair mask.

[0071] Example 4

In Example 1, the amount of rayon fiber used for the surface layer is 20% by mass, the basis weight of the surface layer is 25 g / m ² , the basis weight of the inner layer is 25 g / m ² , and the basis weight of the back layer is 25 g / m ² A face mask was prepared in the same manner as in Example 1 except that When the obtained face mask was used by a woman with atopic dermatitis in the same manner as in Example 1, although it was slightly less flexible than that in Example 1, the impression that it was comfortable was obtained. .

[0072] Example 5

In Example 1, the third sheet is not used, and the laminated sheet is composed of ^two layers having no back layer (ie, a surface layer and an inner layer), the surface layer being a basis weight of 30 g / m ² and the inner layer being 30 g / m ^2. Manufactured. A face mask was prepared using this laminated sheet. When the obtained face mask was used by a woman with atopic dermatitis in the same manner as in Example 1, the impression was that it was slightly less flexible than the sheet of Example 1 but was comfortable. However, there are women who have the wrong sides, and their power was strong enough to say that they were comfortable.

Claims

The scope of the claims

[I] A laminated sheet in which a second layer composed of fibers containing an ethylene-vinyl alcohol copolymer is formed on at least one surface of a first layer composed of cellulosic fibers, A fiber sheet containing an ethylene butyl alcohol copolymer A laminated sheet in which at least the surface is a fiber made of an ethylene butyl alcohol copolymer.

[2] The laminated sheet according to claim 1, wherein the fiber is an ethylene butyl alcohol copolymer fiber having an average fiber fineness of 0.9 dtex or less including an ethylene butyl alcohol copolymer.

[3] The laminated sheet according to [1], wherein the cellulosic fiber is rayon fiber.

[4] Claim 2 in which the second layer is composed of ethylene butyl alcohol copolymer fiber and cellulosic fiber, and the ratio (mass ratio) of the two is the former Z latter = 97Z3 to 60Z40. The laminated sheet as described.

[5] The second layer is composed of an ethylene butyl alcohol copolymer fiber having an average fineness of 0.9 decitex or less and a rayon fiber having an average fineness of 1.2 decitex or less, and the ratio (mass ratio) of the two 2. The laminated sheet according to claim 1, wherein the former is the latter = 95Ζ5 to 70Ζ30.

6. The laminated sheet according to claim 1, wherein the second layer is formed on both surfaces of the first layer.

7. The laminated sheet according to claim 1, comprising a wet nonwoven fabric!

8. The laminated sheet according to claim 1, having a water absorption rate of 200% or more.

[9] The laminated sheet according to [1], which can contact the skin.

[10] A face mask sheet comprising the laminated sheet according to claim 1.

[II] A body fluid absorbing sheet comprising the laminated sheet according to claim 1.