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WO1996015307A1 - Nappe absorbante a base de fibre composite a phases multiples - Google Patents

Nappe absorbante a base de fibre composite a phases multiples Download PDF

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Publication number
WO1996015307A1
WO1996015307A1 PCT/EP1995/004207 EP9504207W WO9615307A1 WO 1996015307 A1 WO1996015307 A1 WO 1996015307A1 EP 9504207 W EP9504207 W EP 9504207W WO 9615307 A1 WO9615307 A1 WO 9615307A1
Authority
WO
WIPO (PCT)
Prior art keywords
fiber
units
monomer
water
carboxylic acid
Prior art date
Application number
PCT/EP1995/004207
Other languages
English (en)
Inventor
Edward J. PILCICKI
Bi Le-Khac
Robert L. CANNON, Sr.
Original Assignee
Camelot Superabsorbents Limited
Camelot Superabsorbents B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Camelot Superabsorbents Limited, Camelot Superabsorbents B.V. filed Critical Camelot Superabsorbents Limited
Priority to AU39253/95A priority Critical patent/AU3925395A/en
Publication of WO1996015307A1 publication Critical patent/WO1996015307A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42—Use of materials characterised by their function or physical properties
    • A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
    • A61L15/225—Mixtures of macromolecular compounds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
    • A61L15/24—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/263—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof

Definitions

  • the present invention relates to at least two phase composite fibers having at least a surface phase of a polymer which is capable of absorbing water and a core fiber phase and a process for making such fibers.
  • the present invention relates to a two phase composite fiber wherein the surface phase is a so-called superabsorbent material.
  • water when used alone or in the phrases “water- absorbing” , “water-absorbent” and “water-swellable” is understood to mean not only water but also aqueous media such as electrolyte solutions, such as body fluids.
  • U.S. Patents 4,500,315; 4,540,454; 4,537,590; and 4,573,085 disclose a process for making two phase fibers having a surface or outer phase comprising a water absorbent fiber. These patents disclose coating a base or core fiber with a cross- linkable solution comprising an alkali metal or ammonium salt of an acrylate polymer which is polymerized, and crosslinked in situ to form the water-absorbent phase.
  • water-absorbent polymers which are capable of being crosslinked with crosslinking agents such as di- and polyols; di- and polyamines; agents containing an amine and at least one alcohol group; and naturally occurring materials such as saccharides.
  • crosslinking agents such as di- and polyols; di- and polyamines; agents containing an amine and at least one alcohol group; and naturally occurring materials such as saccharides.
  • One example of such polymers can be found in US
  • an alternative two phase fiber may be produced in which the water-absorbent polymer is crosslinked with a crosslinking agent, such as a diol, a polyol, a reactive compound having an amine group and at least one hydroxyl group, glycerol, erythritol, pentaerthritol and mono-, di-, and oligo- saccharides.
  • a crosslinking agent such as a diol, a polyol, a reactive compound having an amine group and at least one hydroxyl group, glycerol, erythritol, pentaerthritol and mono-, di-, and oligo- saccharides.
  • a two phase composite fiber comprising a water absorbent phase on the surface of a core fiber phase wherein the water-absorbent phase forms a coating on the core fiber phase and is formed from: (i) a copolymer containing from about 25 to about 75 mole percent recurring units of at least one ⁇ . ⁇ -unsaturated monomer bearing at least one pendant unit selected from carboxylic acid units and derivatives of carboxylic acid units, and from about 75 to about 25 mole percent recurring units of at least one copolymerizable co- monomer, wherein from about 20 to about 80 percent of the pendant units introduced through the recurring units of the Q.,/3-unsaturated monomer comprise carboxylic acid units or substitutes convertible into carboxylic acid units, and wherein from about 80 to about 20 percent of the total pendant units comprise carboxylate salt units or substitutes convertible into carboxylic salt units; and
  • At least one monomer is preferably selected from alkylene glycols containing 2- 10 carbon atoms and their ethers, cycloalkylene glycols, Bisphenol A, hydroxyl alkylene derivatives of Bisphenol A, hydroquinone, phloroglucinol, hydroxyl alkylene derivatives of diphenols, water soluble reactive compounds bearing one amine group and at least one hydroxyl group, glycerol, erythritol, pentaerythritol and mono-, di- and oligo-saccharides.
  • At least one monomer is preferably present in an amount of from about 0.1 to about 10 parts by weight per 100 parts by weight of the copolymer.
  • the aqueous solution of the water-absorbent phase polymer composition preferably comprises at least 10 weight percent of the water-absorbent phase composition.
  • the coating of the at least one fiber with the aqueous solution preferably provides a pickup on the finished fiber of at least 10 weight percent of the water-absorbent phase polymer composition.
  • the heat treating step is preferably carried out at from about 120 to about 200°C, preferably 150 to 190°C, for a period of time of from about 5 to about 50 minutes, preferably 5 to 30 minutes.
  • the fiber of the above first aspect or made in accordance with the process ot the above second aspect may be used in a composite web comprising these fibers and non-water absorbent fibers.
  • the composite web may be used in an article of manufacture such as disposable diapers, sanitary napkins, tampons, pant liners, adult incontinence pads, coverstocks for feminine hygiene products, surgical and dental sponges, bandages, patient underpads, wipes, domestic wipes, industrial wipes, packaging, filters, medical tray pads, fenestration drapes, mortuary pads, cable wrap, food tray pads, food preservation articles, seed germination pads, pet litter, roofing materials, automotive trim, furniture, bedding, clothing and soil modifiers.
  • an article of manufacture such as disposable diapers, sanitary napkins, tampons, pant liners, adult incontinence pads, coverstocks for feminine hygiene products, surgical and dental sponges, bandages, patient underpads, wipes, domestic wipes, industrial wipes, packaging, filters, medical tray pads, fenestration drapes, mortuary pads, cable wrap, food tray pads, food preservation articles, seed germination pads, pet litter, roofing materials, automotive trim, furniture, bedding, clothing and soil modifiers
  • Suitable copoly ers to produce water-absorbing polymers for use in the present invention will contain from about 25 to about 75 mole percent recurring units of at least one ⁇ ,j8-unsaturated monomer and from about 75 to about 25 mole percent recurring units of at least one copolymerizable monomer.
  • the copolymer preferably contains from about 35 to about 65 mole percent of recurring units of at least one ,/3-unsaturated monomer and from about 65 to about 35 mole percent of at least one copolymerizable co-monomer.
  • the copolymer will be an equimolar copolymer.
  • Suitable ⁇ ,/3-unsaturated monomers are those bearing at least one pendant carboxylic acid unit or derivative of a carboxylic acid unit.
  • Derivatives of carboxylic acid units include carboxylic acid salt groups, carboxylic acid amide groups, carboxylic acid imide groups, carboxylic acid anhydride groups and carboxylic acid ester groups.
  • Suitable c., / 3-unsaturated monomers include aleic acid, crotonic acid, fumaric acid, mesaconic acid, the sodium salt of maleic acid, the sodium salt of 2- methyl, 2-butene dicarboxylic acid, the sodium salt of itaconic acid, maleamic acid, maleamide, N-phenyl maleimide, maleimide, maleic anhydride, fumaric anhydride; itaconic anhydride, citraconic anhydride; mesaconic anhydride, methyl itaconic anhydride, ethyl maleic anhydride, diethylmaleate, methylmaleate; and the like, and their mixtures.
  • Any suitable copolymerizable co-monomer can be employed.
  • suitable copolymerizable co-monomers include ethylene, propylene, isobutylene, C, to C 4 alkyl methacrylates, vinyl acetate, methyl vinyl ether, isobutyl vinyl ether, and styrenic compounds having the formula:
  • R represents hydrogen or an alkyl group having from 1 to 6 carbon atoms, and wherein the benzene ring may be substituted with low molecular weight alkyl or hydroxyl groups.
  • Suitable C, to C 4 alkyl acrylates include, for example, methyl acrylate, ethyl acrylate, isopropyl acrylate, n-propyl acrylate, n-butyl acrylate, and the like, and their mixtures.
  • Suitable C, to C 4 alkyl methacrylates include, for example, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-propyl methacrylate, n-butyl methacrylate, and the like, and their mixtures.
  • Suitable styrenic compounds include, for example, styrene, c.-methylstyrene, p- methylstyrene, t-butylstyrene, and the like, and their mixtures.
  • the pendant units on the ⁇ ,/3-unsaturated monomer will determine what, if any, additional reactions must be carried out to obtain a copolymer having the requisite pendant units necessary to produce the water-absorbing compositions of this invention.
  • these water-absorbing compositions will contain from about 20 to about 80 percent pendant carboxylic acid units and from about 80 to about 20 percent pendant carboxylate salt units.
  • both units are present in an amount of from about 30 to about 70 percent.
  • the ⁇ . ⁇ -unsaturated monomer bears only carboxylic acid amide, carboxylic acid imide, carboxylic acid anhydride, carboxylic acid ester groups or mixtures thereof, it will be necessary to convert at least a portion of such carboxylic acid derivative groups to carboxylic acid groups by, for example, a hydrolysis reaction. If the ⁇ ,/?-unsaturated monomer bears only carboxylic acid salt groups, acidification to form carboxylic acid groups will be necessary using methods and materials well known in the art.
  • the final copolymer must contain from about 80 to 20 percent pendant carboxylate salt units. Accordingly, it may be necessary to carry out a neutralization reaction. Neutralization of carboxylic acid groups with a strong organic or inorganic base such as NaOH, KOH, ammonia, ammonia-in-water solution, or organic amines will result in the formation of carboxylate salt units, preferably carboxylate metal salt units.
  • a strong organic or inorganic base such as NaOH, KOH, ammonia, ammonia-in-water solution, or organic amines
  • sequence and the number of reactions (hydrolysis, acidification, neutralization, etc.) carried out to obtain the desired functionality attached to the copolymer backbone are not critical. Any number and sequence resulting in a final copolymer which possesses from about 20 to about 80 percent pendant carboxylic acid units and from about 80 to about 20 percent pendant carboxylate salt units is suitable.
  • One copolymer particularly suitable for use is a copolymer of maleic anhydride and isobutylene. Another is maleic anhydride and styrene. Suitable copolymers will have peak average molecular weights of from about 6,000 to about 500,000 or more.
  • Suitable copolymers of maleic anhydride and isobutylene can be prepared using any suitable conventional method. Such copolymers are also commercially available from Kurary Isoprene Chemical Company, Ltd. , Tokyo, Japan, under the trademark
  • ISOBAM ISOBAM copolymers are available in several grades which are differentiated by average viscosity molecular weight: ISOBAM- 10, 160,000 to 170,000; ISOBAM-06, 80,000 to 90,000; ISOBAM-04, 55,000 to 65,000, and ISOBAM-600, 6,000 to 10,000.
  • a water-absorbing composition of the present invention at least one copolymer as described above and at least one monomer bearing at least two hydroxyl groups are blended such that the water-absorbing composition contains, in weight percent, from about 70 to about 99.5 total copolymer and from about 0.5 to about 30 total monomer.
  • the composition will contain from about 90 to about 99 weight percent total copolymer and from about 1 to about 10 weight percent total monomer.
  • Suitable monomers include those bearing at least two hydroxyl groups and having a relatively low average molecular weight, less that 1 ,000, can be employed in the practice of this invention.
  • Suitable monomers include, for example, ethylene glycol, propylene glycol, trimethylene glycol, 1 ,4-butane diol, 2-methyl, 1,3-propane diol, neopentyl glycol, 1,5-pentane diol, diethylene glycol, dipropylene glycol, 1,4-cyclohexane dimethanol, Bisphenol A, l ,4-bis(0 hydroxyethoxy)bisphenol, hydroquinone, phloroglucinol, glycerol, erythritol, pentaerythritol, 1 ,4-dihydroxysedoheptulose, and the like.
  • Particularly suitable monomers for use in the practice of the present invention are ethylene glycol, propylene glycol, 1-4-butane diol, diethylene glycol, and glycerol.
  • the water-absorbing composition ot the present invention can be prepared using any suitable blending method well known in the art.
  • the monomer is believed to serve as a high temperature, slow-reacting, cross-linking type agent for the copolymer particles resulting in the formation of covalent cross-link type bounds upon curing.
  • a temperature of about 150°C or higher is typically required to achieve cure.
  • a temperature of about 140°C or higher is typically needed to achieve cure.
  • a partially neutralized isobutylene-maleic anhydride copolymer is employed, a temperature of about 200°C or higher is typically needed to achieve cure.
  • Suitable curing temperatures for the present invention range from about 120°C to about 220°C. Suitable curing times are in the range of from about 5 to 30 minutes.
  • the curing may be done in any of the well known heat curing methods and apparatus, such as for example, tunnel ovens and counter current hot air dryers.
  • the present invention facilitates the production of the absorbent fibers using conventional equipment, requires considerably less cross-linking agent, shorter cure times, and yields absorbent fibers having uniformly consistent absorbency properties. Quite surprisingly, the absorbent fibers this invention possesses much better absorbent properties as compared to the prior art fibers.
  • the uncured but curable, polymer composition preferably comprising the reaction product of; (a) a partially neutralized aqueous polymer composition prepared by the reaction of a strong base with a polymer containing at least about 25 mole percent recurring units of an ⁇ .
  • J-unsaturated monomer having in its molecular structure one or two carboxyl groups or one or two other groups convertible to carboxylic groups; the degree of neutralization of said partially neutralized polymer bring within the range of from about 0.2 to about 0.8 equivalent of total carboxyl group of groups convertible to carboxyl groups of the ⁇ ,j ⁇ -unsaturated monomer with, (b) from about 0.1 to about 10 parts by weight of at least one reactive compound per 100 parts by weight of the partially neutralized aqueous polymer, the reactive compound being a water soluble compound bearing one amine group and at least one hydroxyl group, wherein the reaction product is formed by substituted ammonium carboxylate ionic bonding between the un-neutralized carboxyl groups on the polymer and the amine groups on the reactive compound.
  • the core fiber may be selected from the group consisting of rayon fiber, cellulose ester fiber, protein fiber, polyamide fiber, polyester fiber, polyvinyl fiber, polyolefin fiber, polyurethane fiber, aramid fiber, glass fiber and mixtures thereof.
  • a particularly useful core fiber is a fiber having a hollow core such as the polyester, typically polyethylene terephthalate fiber, commercially available from E.I. DuPont de Nemours under the trademark HOLLOWFILL.
  • the core fiber may itself be a composite fiber such as the core-sheath fibers having a polyethylene sheath and a polyester core, where polyethylene terephthalate is typically used as the polyester.
  • the core fiber could be a continuous tow or a staple fiber.
  • the coating of the core fiber with the said solution of copolymer and polymer can be effected by any suitable method such as spray coating, or passing said core fiber through a bath containing solution of said copolymer and said polymer.
  • a suitable amount of a polypropylene mesh fiber was soaked in an excess of 40% solids FIBERSORB (an aqueous solution of the sodium salt of maleic anhydride and isobutylene) syrup for 2 days allowing the syrup to saturate the fiber. The fiber was then removed form the syrup and excess syrup was pressed out. The syrup was then cured in a hot air convection oven at 210°C for 20 minutes.
  • FIBERSORB an aqueous solution of the sodium salt of maleic anhydride and isobutylene
  • a second suitable amount of a polypropylene mesh fiber was soaked in an excess of 40% solids FIBERSORB syrup which had been diluted with deionized water to provide a 28% solids syrup.
  • the fiber was soaked in an excess amount of this 28% solids syrup for 2 days to saturate the fiber and then the excess syrup was pressed out.
  • the syrup was then cured in a hot air convection oven at 210°C for 20 minutes.
  • the "tea bag” test is as follows. First 10 pieces of tea bag paper is cut to 5" x 2" and folded to 2.5" x 2" and heat sealed on 2 sides. These bags are then soaked in a 0.9% NaCl saline solution, removed, dabbed lightly with filter paper to remove excess saline solution and weighed. These weights are then averaged and the value is recorded as "W 2 ". In a triplicate set of tea bags measuring 5" x 2" is placed approximately 0.2 grams of sample staple fiber, the exact weight of which is recorded as W 3 , the bags loaded with the sample staple fiber are heat sealed. The triplicate sample containing tea bags are then placed in a 0.9% NaCl saline solution, with stirring, for 10 minutes.
  • Each tea bag is then removed from the saline solution, allowed to drain for 10 seconds and then dabbed lightly with filter paper to remove excess saline solution.
  • Each sample containing tea bag is then weighed and recorded as W,.
  • Each sample containing tea bag is then placed in a Buchner porcelain funnel, a small amount of 0.9% saline solution is poured over the same to re-saturate it, and then the sample containing tea bag is exposed to a vacuum of 10.9 cm of perchloroethylene column for 5 minutes. The sample is removed and weighed and the weight is recorded as W 4 .
  • W 2 average weight in grams of 10 empty, wet tea bags
  • W 3 original weight in grams dry staple fiber
  • W 4 final 0.5 psi weight in grams of gel plus wet tea bag.
  • liquid retention values of the samples of the present invention exceed that of the competitive sample in every case in the 0.5 psi test, and every time except one in the

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • Hematology (AREA)
  • Materials Engineering (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Textile Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

On décrit une fibre composite à deux phases comprenant une phase fibreuse centrale et une phase constituant une surface d'absorption d'eau contenant la fibre centrale, ainsi qu'un procédé de production de cette fibre composite.
PCT/EP1995/004207 1994-11-10 1995-10-26 Nappe absorbante a base de fibre composite a phases multiples WO1996015307A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU39253/95A AU3925395A (en) 1994-11-10 1995-10-26 Absorbent multiphase composite fiber web

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US33729194A 1994-11-10 1994-11-10
US08/337,291 1994-11-10

Publications (1)

Publication Number Publication Date
WO1996015307A1 true WO1996015307A1 (fr) 1996-05-23

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PCT/EP1995/004207 WO1996015307A1 (fr) 1994-11-10 1995-10-26 Nappe absorbante a base de fibre composite a phases multiples

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WO (1) WO1996015307A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236685A (en) * 1962-06-20 1966-02-22 Eastman Kodak Co Process for treating textile fibers and other shaped products with coatings
DE1444144A1 (de) * 1962-10-24 1968-10-24 Zschimmer & Schwarz Verfahren zur Erhoehung der Wasseraufnahmefaehigkeit von Gebilden verschiedener Art,wie Fasern,Watte,Vliesen,Faeden,Geweben,Gewirken,Schwaemmen
FR2091981A1 (fr) * 1970-03-20 1972-01-21 Asahi Chemical Ind
US3980663A (en) * 1973-06-20 1976-09-14 The Dow Chemical Company Absorbent articles and methods for their preparation from crosslinkable solutions of synthetic carboxylic polyelectrolytes
EP0164554A2 (fr) * 1984-05-14 1985-12-18 Kao Corporation Méthode pour traitement de textiles
US4731067A (en) * 1986-10-06 1988-03-15 Arco Chemical Company Extended shelf life water-absorbing composition which facilitates fiber formation
EP0268498A2 (fr) * 1986-11-20 1988-05-25 Ciba Specialty Chemicals Water Treatments Limited Produits absorbants et leur préparation
EP0272074A2 (fr) * 1986-12-15 1988-06-22 Camelot Superabsorbents Ltd Composition polymérique absorbant l'eau, procédé de sa préparation et objet la contenant

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236685A (en) * 1962-06-20 1966-02-22 Eastman Kodak Co Process for treating textile fibers and other shaped products with coatings
DE1444144A1 (de) * 1962-10-24 1968-10-24 Zschimmer & Schwarz Verfahren zur Erhoehung der Wasseraufnahmefaehigkeit von Gebilden verschiedener Art,wie Fasern,Watte,Vliesen,Faeden,Geweben,Gewirken,Schwaemmen
FR2091981A1 (fr) * 1970-03-20 1972-01-21 Asahi Chemical Ind
US3980663A (en) * 1973-06-20 1976-09-14 The Dow Chemical Company Absorbent articles and methods for their preparation from crosslinkable solutions of synthetic carboxylic polyelectrolytes
EP0164554A2 (fr) * 1984-05-14 1985-12-18 Kao Corporation Méthode pour traitement de textiles
US4731067A (en) * 1986-10-06 1988-03-15 Arco Chemical Company Extended shelf life water-absorbing composition which facilitates fiber formation
EP0264208A2 (fr) * 1986-10-06 1988-04-20 Camelot Superabsorbents Ltd Composition absorbant l'eau ayant une durée de stockage prolongée et qui facilite la formation de fibres
EP0268498A2 (fr) * 1986-11-20 1988-05-25 Ciba Specialty Chemicals Water Treatments Limited Produits absorbants et leur préparation
EP0272074A2 (fr) * 1986-12-15 1988-06-22 Camelot Superabsorbents Ltd Composition polymérique absorbant l'eau, procédé de sa préparation et objet la contenant

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