EP0522045A1 - Matiere jetable dans l'eau - Google Patents

Matiere jetable dans l'eau

Info

Publication number
EP0522045A1
EP0522045A1 EP19910907373 EP91907373A EP0522045A1 EP 0522045 A1 EP0522045 A1 EP 0522045A1 EP 19910907373 EP19910907373 EP 19910907373 EP 91907373 A EP91907373 A EP 91907373A EP 0522045 A1 EP0522045 A1 EP 0522045A1
Authority
EP
European Patent Office
Prior art keywords
water
polymer
substrate
coating
soluble
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP19910907373
Other languages
German (de)
English (en)
Inventor
Arthur Roger Shipley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DISPOSABLES AND DIAPER DEVELOPMENTS LIMITED
Original Assignee
DISPOSABLES AND DIAPER DEVELOPMENTS Ltd
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 DISPOSABLES AND DIAPER DEVELOPMENTS Ltd filed Critical DISPOSABLES AND DIAPER DEVELOPMENTS Ltd
Publication of EP0522045A1 publication Critical patent/EP0522045A1/fr
Withdrawn legal-status Critical Current

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
    • A61L15/62—Compostable, hydrosoluble or hydrodegradable materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • A61F13/15211—Properties of the article, e.g. stiffness or absorbency soluble or disintegratable in liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/46—Applications of disintegrable, dissolvable or edible materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • A61F13/15211—Properties of the article, e.g. stiffness or absorbency soluble or disintegratable in liquid
    • A61F2013/15227—Properties of the article, e.g. stiffness or absorbency soluble or disintegratable in liquid by its solubility in particular Ph solution
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material
    • A61F2013/51409—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a film
    • A61F2013/51433—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a film being biodegradable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F2013/53481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad being biodegradable

Definitions

  • the present invention relates to a disposable material, notably to a material which is to be disposed of into the environment, such as a disposable diaper or other body fluid absorbing material or a packaging material.
  • the pad incorporate a dry acid or alkali powder within the pad so as to provide the required pH conditions when the pad is immersed in the water of the toilet pan.
  • this will also serve to initiate disintegration of the pad during use and the pad must therefore be retained within a non-disintegrable outer member if it is not to disintegrate prematurely.
  • One is then faced with the problem of disposing of the outer member as well the partially disintegrated contents.
  • the present invention provides a water disposable material which comprises a substrate which is readily soluble and/or disintegrated in water, which substrate is coated or otherwise protected from water by a surface layer or coating of a material which is readily soluble and/or disintegrable in water when exposed to pH conditions markedly different to those to which it is exposed during normal use, notably an alkali sensitive material.
  • the material of the invention comprises a substrate in the form of a sheet or fibre or a pad of bonded fibres which are made from a water soluble polymer, the sheet, pad or fibre having an encasing coating of a polymer which is readily soluble in water having a pH below 6 or above 7.5.
  • the substrate material can also provide the surface layer, for example so that the water disposable material is formed throughout from an alkali soluble or disintegrable material, for example from a acrylic polymer.
  • an alkali soluble or disintegrable material for example from a acrylic polymer.
  • the invention will be described hereinafter in terms of a composite material having a surface coating of the pH sensitive material, notably an alkali soluble or disintegrable material, upon a water soluble or disintegrable substrate.
  • the substrate can be made from a wide range of materials which are water soluble or disintegrable.
  • the substrate can be a paper or card sheet; a tissue paper; a felted or resin bonded pad or sheet of cellulose or cellulose derivative fibres where the fibres and/or the bonding resin are water soluble: or can be made from a polymer sheet or fibre, for example from polymers or co- polymers of polyvinyl alcohol; pol (alkylene oxide), notably poly- (ethylene oxide); or polyvinylpyrrolidone.
  • Particularly preferred water soluble polymers for present use are polyvinyl alcohols, whose molecular weight can be varied as is known according to the degree of water solubility or disintegration required, and having saponification values in the range 80 to 90%, notably about 88%.
  • the pH sensitive and soluble or disintegrable polymer for use in the coating is one which has a water resistant or water barrier property under normal pH conditions so that it retains a wet strength or water barrier property, depending upon the end use of the material, but which loses that property upon exposure to pH conditions which are markedly different from normal.
  • the coating polymer is preferably one which is substantially insoluble in water under the conditions of normal use, but which is soluble or which disintegrates when exposed to aqueous alkali solutions.
  • Typical alkali sensitive polymers for present use are homo- and co-polymers of acrylic acid and esters thereof, notably C 1 " c 5 alkyl esters of acrylic or metha ⁇ crylic acids, for example the methyl, ethyl or butyl esters, or acrylonitrile; homo- and co-polymers of carboxy ester lactones, styrene-monoethyl maleate or N,N' -diethyl- acrylamide; polymers of other types which have been chemically modified by the introduction of solubilising groups such as carboxylic acid, sulphonic acid, sulphite, sulphate, phenolic hydroxy, ester or diamide groups; or polymers which have been rendered soluble by the introduction of interpolymer units into the main polymer chain, for example the silane interpolymers of US Patents Nos 4 062 451 and 3 951 893.
  • alkali sensitive polymers for present use are the substantially linear co-polymers of from 2 to 6 parts by weight of one or more monomers selected from acrylic acid, ethyl acrylate, butyl acrylate or acrylonitrile with one part by weight of methacrylic acid monomer to give thermoplastic resin products having molecular weights of from 25,000 to 300,000.
  • the polymers for present use as the surface layer or coating are prepared using conventional techniques, for example by reaction of the appropriate amounts of the relevant acrylic monomers or pre-polymers in the present of peroxide or sulphoxylate polymerisation initiators.
  • the reaction is carried out to yield thermoplastic resins which are substantially free from cross-linking, ie. are substantially linear polymers, and which have a carboxyl functionality of from 3 to 15 weight percent and an acid number in the range 30 to 90.
  • the resulting resin can be treated in known manner with an alkali or base, for example ammonia, sodium hydroxide, morpholine or an alkylamine (for example triethylamine or triethanol- amine) , to impart the desired water solubility under alkaline conditions.
  • an alkali or base for example ammonia, sodium hydroxide, morpholine or an alkylamine (for example triethylamine or triethanol- amine)
  • the coating may be a continuous coating which has been achieved by applying a hot melt or a solution in an organic solvent of a suitable acrylic acid homo-polymer or co- polymer to a pre-formed sheet or fibre of the required substrate material, and dried or cured in situ.
  • the polymer of the substrate eg. the vinyl alcohol polymer
  • the coating resin can be co-extruded with the coating resin to form a composite fibre or sheet.
  • a solution of a suitable monomer or oligomer of the coating polymer can be applied to a preformed sheet or fibre of the substrate material and polymerised to form the coating polymer in situ on the substrate.
  • a solution, emulsion or dispersion of the coating polymer is applied by dip coating or spraying to individual fibres of the substrate material to provide a substantially uniform coating upon each fibre.
  • the coated fibres can then be woven into a reticulate sheet material.
  • the coated fibres can be formed into a non-woven material, for example a pad using conventional techniques.
  • the pad can be formed by air blowing the chopped coated fibres into a randomly orientated pad of the fibres whilst the coating polymer is still drying or curing so as to form a bond between adjacent fibres; by forming the coated fibres into a pad and heating the pad whilst applying pressure to fuse the fibres to one another at the points of contact within the pad; or by co-extruding the substrate and coating polymers to form a long fibre which is converted into a pad by spinning, flailing or oscillating the fibre as it is extruded to form an intertwined mass of fibre from which the pad may be cut.
  • the coating polymer can be applied to achieve any desired loading of the polymer on the substrate, according to the nature of the coating polymer and the conditions under which the material of the invention is to be used.
  • the material is to be used as a packaging material, it may be desirable to have a comparatively thick coating of polymer on the substrate.
  • the material is to be used in a next-the-person application, for example as a diaper or incontinence pad, it will usually be necessary to have only a thin coating.
  • the coating polymer can be present in from 5 to 500% by weight of the substrate.
  • the coating polymer serves to protect the underlying substrate during normal use of the material.
  • the material of the invention can be used to provide the absorbent pad of a diaper, a potty liner, a nappy liner or other absorbent article for absorbing bodily fluids and/or to provide the water impervious outer layer to such an article which retains the fluid within the pad until it is disposed.
  • the article made from the material of the invention can also take the form of packaging, such as a disposable bag, carton or the like within which material is contained.
  • the substrate can therefore take a wide range of forms, sizes and thicknesses and the coating polymer is preferably of the minimum thickness required to achieve a satisfactory degree of protection commensurate with an adequate speed of dissolution or disintegration when disposal is required.
  • the coating and substrate polymers can contain other ingredients which enhance their utility in the end use to which they are to be applied.
  • the polymers will usually contain stabilizers and plasticizers, anti-oxidants and UV or thermal stabilisers. Where the materials are to be used in packaging of foodstuffs or in next-the-skin applications, it will be appreciated that the appropriate food grade or physiologically acceptable grades of polymer and other ingredients should be used.
  • the materials of the invention find use in a wide range of applications where disposability of the material is required.
  • the materials can be used as the water impervious layer of a diaper or sanitary pad or a potty liner; as the absorbent pad in a potty or nappy liner; as the wall material for a colostomy or a blood bag; as a water disposable packaging for a wide range of materials; as containers which are used to release their contents into a fluid after a given delay, for example in the administration of medicaments; or as disposable fabrics, for example for disposable clothing.
  • the materials are preferably used in conjunction with pads of conventional cellulosic or other fibres which are bonded together with a soluble or disintegrable polymer as used as the coating polymer in the materials of the invention. In this way a totally disintegrable diaper can be achieved.
  • acrylic polymers have particularly advantageous alkali solubility properties and that they are particularly suitable for use as the coating polymer since they have good water barrier and wet strength properties at pH values in the range 6 to 8.5, yet readily dissolve and disintegrate when exposed for short periods to pH values above 8.5.
  • Such polymers can therefore be used both as the coating and substrate polymers to enable a wholly soluble pad of fibres and associated water impervious backing sheet to be made from the one material, with attendant saving in processing costs and complexity.
  • the invention therefore also provides a structure having fluid absorbent properties characterised in that the structure is made substantially wholly from a homo- or co- polymer of acrylic acid and esters thereof, notably methyl, ethyl or butyl esters of acrylic or methacrylic acids or acrylonitrile; notably the co-polymers of from 2 to 6 parts by weight of one or more monomers selected from acrylic acid, ethyl acrylate, butyl acrylate or acrylonitrile with one part by weight of methacrylic acid monomer to give thermoplastic polymer products having molecular weights of from 25,000 to 300,000 which are substantially free from cross-linking and which have a carboxyl functionality of from 3 to 15 weight percent and an acid number in the range 30 to 90.
  • a homo- or co- polymer of acrylic acid and esters thereof notably methyl, ethyl or butyl esters of acrylic or methacrylic acids or acrylonitrile
  • co-polymers of from 2 to 6 parts by weight
  • Disposal of the material of the invention is achieved by subjecting the material to pH conditions which differ markedly from those to which it is normally exposed.
  • materials used to absorb or contain bodily fluids or for next to the skin use will normally experience pH values in the range 6 to 8.5, typically 6 to 7.5.
  • the alkaline conditions can be achieved merely be adding the required quantity of a suitable base or alkali to the water.
  • Suitable alkalies or bases include ammonia; sodium or potassium hydroxides or carbonates; or alkyl amines, notably amino alkanols such as 2-amino-2-raethyl propanol.
  • an acid pH is required, this is conveniently achieved by adding mineral acids, for example sulphuric or hydrochloric acids, to the toilet water, or organic acids, for example acetic or citric acids which are readily available to the housewife.
  • mineral acids for example sulphuric or hydrochloric acids
  • organic acids for example acetic or citric acids which are readily available to the housewife.
  • many of the toilet sanitising agents used in domestic toilets are formulated to be sufficiently acidic to achieve disintegration of the materials of the invention without the need for added chemicals.
  • the required amount of acid or alkali can be incorporated as a dry powder within a portion of the article which would not normally be exposed to moisture so that the required pH conditions can be achieved in the water of the toilet pan without the need for added materials.
  • the powder can be incorporated in a sachet or the like attached to the material, eg. to the hem of a diaper, which is ruptured by a suitable tear off strip or other means to expose the contents to the water when the material is to be disposed of.
  • the invention therefore also provides a material or structure of the invention incorporating in a manually releasable form a pH adjusting agent.
  • a toilet sanitising block or fluid formulation can be prepared so that it is sufficiently acid or alkaline to achieve the desired pH value for the water in the toilet pan.
  • the invention provides a toilet sanitising solid or fluid formulation, characterised in that its formulation has been modified so as to provide a pH value in excess of 7.5, typically from 8.5 to 12, within the water in the toilet pan during use.
  • the sanitising agents can be incorporated into a block or other means which is suspended in the toilet cistern or pan so that the sanitising agent is released at each flush of the toilet using conventional techniques.
  • the sanitising agent can incorporate a colouring or other agent to indicate to a user when the water in the toilet pan is of the desired pH value.
  • the invention also provides a method for disposing of a material or structure of the invention, which method comprises placing the material or structure into water; adjusting the pH of the water to a value outside the range at which the material or structure is stable so as to cause at least part of the material or structure to dissolve and/or disintegrate; and disposing of the resultant aqueous mixture.
  • a cellulose fibre with strands 6 to 40 mms long is coated with a 20% solution in ethanol of the acrylic acid co- polymer sold under the Trade Mark Carboset 525 by the B F Goodrich Company.
  • the coated strands are formed into an absorbent pad by heating under pressure to bond the fibres together.
  • the Carboset resin is insoluble in water at 25°C, but is readily a soluble in 0.5% aqueous ammonium hydroxide solution.
  • the pad is then applied to a sheet formed by co-extruding the Carboset resin with a polyvinyl alcohol homo-polymer.
  • the polyvinyl alcohol homo-polymer is very readily soluble in water at 25°C.
  • the product is a sheet having a polyvinyl alcohol core within a Carboset resin coating and is resistant to water and bodily fluids.
  • the composite structure of the pad and sheet can be formed into a diaper which is stable to water and urine, but which readily disintegrates when stirred into water in a toilet pan to which 10 els of 880 ammonia has been added.
  • the resultant slurry of fibres and urine or faeces can be flushed down the toilet with small risk of blockage of the drains and pipe work.
  • Example 1 The process of Example 1 can be repeated except that the fibres are extruded from the Carboset resin and are spun bonded into a pad which is suitable for use with the composite polyvinyl alcohol/Carboset resin sheet or with a sheet wholly extruded from the Carboset resin.
  • diapers or potty liners made from the Carboset resins readily disintegrate in water treated with the ammonia solution to give a pH of 8 or more and can be flushed away.
  • a cardboard sheet can be coated with the solution of the Carboset resin of Example 1 to apply a resin coating of 20g dry weight per square metre.
  • the cardboard can be used to form a wide range of cartons using conventional techniques.
  • the cartons will exhibit good wet strength but will readily absorb water after spraying with 5% aqueous sodium hydroxide solution and can be disposed of as a slurry at a land infill site.
  • a suitable innoculum can be incorporated into the resin solution applied to the cardboard initially.
  • a toilet sanitising block can be prepared by casting a hot melt composition containing a mazoni soap (70 parts) and 2- amino-2-methyl-1-propanol (30 parts) .
  • the block can be suspended under the rim of a toilet pan and the toilet flushed to wash water over the block.
  • the water remaining in the toilet pan when the flush had ceased will have a pH of approximately 9, which is suitable for treatment of a diaper produced in accordance with Example 1.
  • a material which is alkali sensitive is formed by co- extruding a co-polymer of butyl acrylate and methacrylic acid with an outer layer of a mixture of 80 parts of the Carboset resin and 20 parts of the polyethylene resin containing acrylic acid sold under the Trade Mark Dow Primacor.
  • This mixture improves the feel of the resultant sheet or fibre material and results in a material which has a core which is soluble at a pH of 7.5 or more, protected by a material which is less readily soluble so that the material can be used in the manufacture of diapers which can be disintegrated in a toilet as described in Example 1.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Epidemiology (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Vascular Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Mechanical Engineering (AREA)
  • Hematology (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

La présente invention se rapporte à une matière jetable dans l'eau, caractérisée par le fait qu'elle comprend un substrat immédiatement soluble et/ou désintégré dans l'eau, lequel substrat est revêtu, ou protégé de l'eau de façon différente, par une couche de surface constituée d'une matière immédiatement soluble et/ou désintégrable dans l'eau quand elle est exposée à un pH sensiblement différent de celui auquel elle est exposée en utilisation normale. Le substrat est, de préférence, un polymère d'alcool polyvinylique soluble dans l'eau et le revêtement de surface est un polymère acrylique sensible à l'alcali. Cette matière peut s'utiliser pour la fabrication de couches et d'autres articles absorbants à porter au contact de la peau, qu'on peut jeter dans les toilettes dans lesquelles on ajoute un alcali pour porter le pH de l'eau à une valeur supérieure à celle du pH humain en utilisation.
EP19910907373 1990-03-28 1991-03-27 Matiere jetable dans l'eau Withdrawn EP0522045A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909006953A GB9006953D0 (en) 1990-03-28 1990-03-28 Disposable materials
GB9006953 1990-03-28

Publications (1)

Publication Number Publication Date
EP0522045A1 true EP0522045A1 (fr) 1993-01-13

Family

ID=10673419

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910907373 Withdrawn EP0522045A1 (fr) 1990-03-28 1991-03-27 Matiere jetable dans l'eau

Country Status (4)

Country Link
EP (1) EP0522045A1 (fr)
AU (1) AU7553291A (fr)
GB (1) GB9006953D0 (fr)
WO (1) WO1991014413A1 (fr)

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USRE36399E (en) * 1991-04-10 1999-11-23 Isolyser Company, Inc. Method of Disposal of hot water soluble utensils
US5346482A (en) * 1993-04-02 1994-09-13 Hollister Incorporated Two-piece ostomy appliance having flushable pouch and faceplate with protective collar
US5885907A (en) * 1993-04-29 1999-03-23 Isolyser Company, Inc. Method of disposal of hot water soluble garments and like fabrics
CA2128483C (fr) * 1993-12-16 2006-12-12 Richard Swee-Chye Yeo Compositions jetables dans les toilettes
JPH09507091A (ja) * 1993-12-20 1997-07-15 ザ、プロクター、エンド、ギャンブル、カンパニー 高い生分解性を有するｐＨ改質ポリマー組成物
AU716418B2 (en) * 1995-02-09 2000-02-24 Ecoprogress International Limited A water-dispersible bodily liquid absorbent composite
GB2295553B (en) * 1995-02-09 1997-05-21 Ecoprogress Ltd A water dispersible bodily liquid absorbent composite
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US5891812A (en) * 1996-10-11 1999-04-06 Isolyser Company, Inc. Liquid absorbable non-permeable fabrics and methods of making, using, and disposing thereof
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GB9925829D0 (en) * 1999-11-02 1999-12-29 Smiths Industries Plc Disposal means
US6835678B2 (en) 2000-05-04 2004-12-28 Kimberly-Clark Worldwide, Inc. Ion sensitive, water-dispersible fabrics, a method of making same and items using same
US6444214B1 (en) 2000-05-04 2002-09-03 Kimberly-Clark Worldwide, Inc. Ion-sensitive, water-dispersible polymers, a method of making same and items using same
US8329977B2 (en) 2007-08-22 2012-12-11 Kimberly-Clark Worldwide, Inc. Biodegradable water-sensitive films
US8907155B2 (en) 2010-11-19 2014-12-09 Kimberly-Clark Worldwide, Inc. Biodegradable and flushable multi-layered film

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AU7553291A (en) 1991-10-21
GB9006953D0 (en) 1990-05-23
WO1991014413A1 (fr) 1991-10-03

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