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WO1996033680A1 - Article absorbant - Google Patents

Article absorbant Download PDF

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Publication number
WO1996033680A1
WO1996033680A1 PCT/EP1996/001718 EP9601718W WO9633680A1 WO 1996033680 A1 WO1996033680 A1 WO 1996033680A1 EP 9601718 W EP9601718 W EP 9601718W WO 9633680 A1 WO9633680 A1 WO 9633680A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
absorbent
layer
fibers
absorbent core
Prior art date
Application number
PCT/EP1996/001718
Other languages
English (en)
Inventor
Ian Cheyne
Ervin Dan
Curtis Cordell Buxton
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 AU57611/96A priority Critical patent/AU5761196A/en
Publication of WO1996033680A1 publication Critical patent/WO1996033680A1/fr

Links

Classifications

    • 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
    • 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 of the pads
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • 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
    • A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
    • A61F2013/15292—Resistance, i.e. modulus or strength
    • 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
    • A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
    • A61F2013/15447—Fibre dimension, e.g. denier or tex
    • 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
    • A61F2013/530131—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 being made in fibre but being not pulp
    • A61F2013/53016—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 being made in fibre but being not pulp having special shape
    • A61F2013/530167—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 being made in fibre but being not pulp having special shape being crimped
    • 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
    • A61F2013/530481—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 superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/530583—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 superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the form
    • A61F2013/530613—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 superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the form in fibres

Definitions

  • the present invention relates to absorbent articles such as sanitary napkins and pads, incontinence garments and disposable diapers.
  • the present invention relates to a water-absorbing layer for an absorbent article.
  • 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, in particular, electrolyte solutions such as body fluids.
  • Sanitary napkins, pads, incontinence garments and disposable diapers have been known for many years and much effort has been made to improve the functional efficiency of such articles to make them more absorbent, more comfortable to wear and less obtrusive to the wearer.
  • Such products have a core which includes a water-absorbent layer.
  • This water-absorbent layer may be formed from any suitable water-absorbent material including wood pulp, rayon, tissue or any of the water-absorbing polymer compositions known as superabsorbent polymers.
  • U.S. Patent numbers 3,954,721 and 3,983,095 disclose preparations for derivatives of copolymers of maleic anhydride with at least one vinyl monomer in fibrous form.
  • the fibrous copolymers are rendered hydrophillic and water-swellable by reaction with ammonia or an alkali metal hydroxide.
  • U.S. Patent numbers 3,954,721 and 3,983,095 disclose preparations for derivatives of copolymers of maleic anhydride with at least one vinyl monomer in fibrous form.
  • the fibrous copolymers are rendered hydrophillic and water-swellable by reaction with ammonia or an alkali metal hydroxide.
  • Patent No. 3,810,468 discloses lightly cross-linked olefin-maleic anhydride copolymers prepared as substantially linear copolymers and then reacted with a diol or a diamine to introduce cross-linking. The resultant lightly cross-linked copolymers are treated with ammonia or an aqueous or alcohol solution of an alkali metal hydroxide.
  • U.S. Patent No. 3,980,663 describes water-swellable absorbent articles made from carboxylic polyelectrolytes via cross-linking with glycerine diglycidyl ether. These patents are incorporated herein by reference. European Published Application No.
  • 0 268 498 (incorporated herein by reference) describes a water-absorbent composition formed by causing a substantially linear polymer of water-soluble ethylenically unsaturated monomer blends comprising carboxylic and hydroxylic monomers to cross-link internally.
  • water-absorbent compositions are those produced from a copolymer of an ⁇ , ⁇ uosatuxated monomer having, at least one. f* nf1an> " + p i » ⁇ »/ ⁇ from a carboxylic acid group and derivatives thereof and a copolymerisable monomer. A proportion of the pendant units are present in the final copolymer as the free acid and a proportion as the salt of the acid.
  • These copolymers are capable of being cross- linked, either internally or with a variety of cross-linking agents, to form the water- swellable composition. Examples of water-swellable compositions of this type can be found in U.S.
  • carboxylic acid groups include carboxylic acid salt groups, carboxylic acid amide groups, carboxylic acid imide groups, carboxylic acid anhydride groups and carboxylic acid ester groups.
  • the core is generally backed by a fluid-impervious backing sheet to protect clothing and the surrounding area from
  • the article generally has a water-permeable non-woven type cover sheet which defines the surface of the article which will, in use, be in contact with the user.
  • the cover sheet is intended to insulate the wearer from contact with water that has been absorbed into the water-absorbent layer of the core, thus the cover sheet should allow water to pass through it into the core but remain dry and soft to the touch.
  • a cover sheet is described in US 5257982 which is incorporated herein by reference.
  • the core may additionally include a distribution layer which is generally located above the water-absorbent layer.
  • This distribution layer serves to wick the water away from the point of initial contact with the article and transport it to other parts of the water- absorbent layer.
  • the use of a distribution layer of this type is advantageous in addressing the problem of pooling if a substantial volume of water is discharged in a short time and thereby gives the user a feeling of dryness.
  • Examples of distribution layers of this type include those described in EP 0 565 606, GB 2 266 465 and GB 2 278 371 which are incorporated herein by reference.
  • Rewet is a measure of how dry the articles feel to the touch after water-absorption. This is generally measured under load of approximately 3-5kPa. Rewet is of particular importance in the applications to which the absorbent articles of the present invention are directed as if the article feels damp the user will feel damp and uncomfortable. Further, where the article is, for example, a diaper, the problem of rewet may result in irritation of the babies skin.
  • the problem of rewet is particularly acute where the water-absorbent layer is formed from or includes the superabsorbent polymers described above, in particular from superabsorbent fibers.
  • the superabsorbent polymers described above can absorb a large volume of water and absorption can take place in a short time period, the water, in some circumstances, is not held wholly in the fibers and the polymers may feel damp to the touch. Without wishing to be bound by any theory, we believe that water may be desorbed from the polymers.
  • the core additionally includes a non-water-absorbent spacer layer which prevents the absorbent layer from coming into contact with the cover sheet of the end product.
  • a multiple layer water-absorbent core suitable for use in an absorbent article comprising a water- absorbent layer and a non-water-absorbent spacer layer located above the water- absorbent layer.
  • the non-water-absorbent spacer layer is preferably thick, resilient or both thick and resilient.
  • Suitable materials for the production of the spacer layer include woven and non- woven materials and apertured films. Any suitable apertured film may be used. One example of an apertured film is described in WO 94/28846 which is incorporated herein by reference. Where the spacer layer includes an apertured polymeric film, the film may be corrugated.
  • the spacer layer comprises loose non-water-absorbent fibers between the water-absorbing layer of the core and the cover sheet.
  • a multiple layer water-absorbent core suitable for use in an absorbent article comprising a water-absorbent layer and a layer of loose non-water-absorbent fibers located above the water-absorbent layer.
  • the loose fibers of the present invention are distinct from the non-woven fabrics that have been used in known distribution layers in that there is no cohesion between the fibers.
  • the fibers may be continuous or staple.
  • non-water-absorbent we mean that the fibers do not absorb water to an appreciable extent.
  • suitable materials from which these fibers may be formed include natural or synthetic fibers such as cellulose, viscose, polyester, non-water-absorbent polymers of ethylene, non-water-absorbent polymers of propylene, polyamide and ethylene-propylene copolymer fibers, and mixtures thereof and the like, with polyester, polyethylene and polypropylene fibers being particularly preferred.
  • the multiple layer water-absorbent core suitable for use in an absorbent article may additionally include a distribution layer. Where a distribution layer is included, it may be located above or below the layer of loose fibers. However, it is preferred that when a distribution layer is present, it is located between the loose fibers and the water-absorbent layer.
  • the loose fibers may be of high denier, high resilience or of both high denier and high resilience.
  • high denier we mean that the fibers have a thickness of greater than about 5 denier and preferably a thickness of greater than 10 denier.
  • high resilience we mean that when a pressure of up to 5kPa is applied, the fibers are not crushed.
  • the loose fibers are preferably crimped. Crimping serves to improve the ability of the loose fibers to prevent rewet.
  • the water-absorbent layer of the core preferably includes a superabsorbent polymeric composition which may be in the form of fibers.
  • an absorbent article comprising a liquid pervious cover sheet, a liquid impervious backsheet and an multiple layer water-absorbent core described in the above first aspect wherein the cover sheet is joined to the backsheet to enclose the water-absorbent core.
  • the use of the multiple layer water-absorbent core is particularly suitable for use where the core includes water-absorbent fibers formed from a syrup comprising an ⁇ ,B unsaturated monomer having at least one pendant unit selected from a carboxylic acid group and derivatives thereof and a copolymerisable monomer.
  • a proportion of the pendant units are preferably present in the final copolymer as the free acid and a proportion as the salt of the acid.
  • These copolymers are capable of being cross- linked, either internally or with a variety of cross-linking agents, to form the water- absorbent composition
  • the absorbent article 1 comprises a liquid impervious backsheet 2, a liquid pervious cover sheet 3 and a multiple layer water-absorbent core 4.
  • the core comprises a water-absorbent layer 4a, a distribution layer 4b and a layer of loose non-water-absorbent fibers 4c.
  • This absorbent article exhibits improved rewet over conventional water absorbent articles.
  • Figure 1 describes the distribution layer 4b as being located between the water-absorbent layer 4a and the layer of loose non-water-absorbent fibers 4c, it will be understood that the distribution layer 4b may be located between the layer of loose non-water-absorbent fibers 4c and the cover sheet 3.
  • Example 1 A 14" x 4" core comprised consisting of polypropylene, having a core weight of 14g and including 25% by weight of superabsorbent fibers of the type commercially available from Camelot Superabsorbents Limited. 3g of loose non-water-absorbent fibers were placed on the water-absorbing layer of the core and a cover sheet was laid over the non- water-absorbing fibers. 3 x 43ml of saline were applied to the cover sheet and the rewet was measured.
  • One method of measuring rewet is by adding 15mls of 0.9% saline solution to the absorbent article at a rate of 2ml/sec. After 15 minutes, 10 preweighed Whatman TM #3 filter papers (dry weight Wl) are placed on top of the composite pad and a 3kPa load is applied for 2 minutes. The filter papers are then removed and reweighed (wet weight W2). Rewet can then be calculated according to the following formula:
  • the rewet was measured in accordance with this method and was found to be 0.2.

Landscapes

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

Abstract

Noyau multicouche absorbant l'eau, utile dans un article absorbant et comprenant une couche d'absorption d'eau ainsi qu'une couche d'espacement n'absorbant pas l'eau, est préférablement composée de matières en bourre n'absorbant pas l'eau, et est située au-dessus de la couche absorbante. On décrit également un article absorbant dont le noyau est enfermé entre une feuille supérieure perméable aux liquides et une feuille inférieure imperméable à ceux-ci.
PCT/EP1996/001718 1995-04-27 1996-04-25 Article absorbant WO1996033680A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU57611/96A AU5761196A (en) 1995-04-27 1996-04-25 Absorbent article

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9508541.1A GB9508541D0 (en) 1995-04-27 1995-04-27 Absorbent article
GB9508541.1 1995-04-27

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US08/945,664 Continuation-In-Part US6316486B1 (en) 1995-05-09 1996-04-29 Alkyl dihalogenated phenyl-substituted ketoenols useful as pesticides and herbicides

Publications (1)

Publication Number Publication Date
WO1996033680A1 true WO1996033680A1 (fr) 1996-10-31

Family

ID=10773598

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/001718 WO1996033680A1 (fr) 1995-04-27 1996-04-25 Article absorbant

Country Status (3)

Country Link
AU (1) AU5761196A (fr)
GB (1) GB9508541D0 (fr)
WO (1) WO1996033680A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6369292B1 (en) 1996-12-20 2002-04-09 Kimberly-Clark Worldwide, Inc. Absorbent articles having reduced outer cover dampness

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0359501A2 (fr) * 1988-09-12 1990-03-21 JOHNSON & JOHNSON INC. Serviette hygiénique intégrée
WO1990014061A1 (fr) * 1989-05-24 1990-11-29 Allied Colloids Limited Articles absorbants
WO1991011161A1 (fr) * 1990-01-27 1991-08-08 Smith & Nephew Plc Produits absorbants d'usage hygienique
EP0483592A1 (fr) * 1990-10-16 1992-05-06 Kimberly-Clark Corporation Dispositif protecteur féminin à jeter
WO1993001779A1 (fr) * 1991-07-23 1993-02-04 The Procter & Gamble Company Articles absorbants, conçus en particulier pour le flux menstruel, a absorption de fluide amelioree pour le confort et l'aisance
DE9307894U1 (de) * 1993-05-25 1993-07-22 Corovin GmbH, 3150 Peine Körperflüssigkeitsabsorber
EP0572033A2 (fr) * 1992-05-29 1993-12-01 Kimberly-Clark Corporation Article absorbant
WO1994005245A1 (fr) * 1992-09-10 1994-03-17 The Procter & Gamble Company Structure absorbant, transportant et retenant un fluide

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0359501A2 (fr) * 1988-09-12 1990-03-21 JOHNSON & JOHNSON INC. Serviette hygiénique intégrée
WO1990014061A1 (fr) * 1989-05-24 1990-11-29 Allied Colloids Limited Articles absorbants
WO1991011161A1 (fr) * 1990-01-27 1991-08-08 Smith & Nephew Plc Produits absorbants d'usage hygienique
EP0483592A1 (fr) * 1990-10-16 1992-05-06 Kimberly-Clark Corporation Dispositif protecteur féminin à jeter
WO1993001779A1 (fr) * 1991-07-23 1993-02-04 The Procter & Gamble Company Articles absorbants, conçus en particulier pour le flux menstruel, a absorption de fluide amelioree pour le confort et l'aisance
EP0572033A2 (fr) * 1992-05-29 1993-12-01 Kimberly-Clark Corporation Article absorbant
WO1994005245A1 (fr) * 1992-09-10 1994-03-17 The Procter & Gamble Company Structure absorbant, transportant et retenant un fluide
DE9307894U1 (de) * 1993-05-25 1993-07-22 Corovin GmbH, 3150 Peine Körperflüssigkeitsabsorber

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6369292B1 (en) 1996-12-20 2002-04-09 Kimberly-Clark Worldwide, Inc. Absorbent articles having reduced outer cover dampness

Also Published As

Publication number Publication date
GB9508541D0 (en) 1995-06-14
AU5761196A (en) 1996-11-18

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