CA2534778A1 - Absorbant structures comprising coated water-swellable material - Google Patents

Absorbant structures comprising coated water-swellable material Download PDF

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Publication number
CA2534778A1
CA2534778A1 CA 2534778 CA2534778A CA2534778A1 CA 2534778 A1 CA2534778 A1 CA 2534778A1 CA 2534778 CA2534778 CA 2534778 CA 2534778 A CA2534778 A CA 2534778A CA 2534778 A1 CA2534778 A1 CA 2534778A1
Authority
CA
Canada
Prior art keywords
water
swellable
absorbent structure
coating agent
swellable material
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.)
Granted
Application number
CA 2534778
Other languages
French (fr)
Other versions
CA2534778C (en
Inventor
Renae Dianna Fossum
Mattias Schmidt
Axel Meyer
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.)
Procter and Gamble Co
Original Assignee
The Procter & Gamble Company
Renae Dianna Fossum
Mattias Schmidt
Axel Meyer
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 The Procter & Gamble Company, Renae Dianna Fossum, Mattias Schmidt, Axel Meyer filed Critical The Procter & Gamble Company
Publication of CA2534778A1 publication Critical patent/CA2534778A1/en
Application granted granted Critical
Publication of CA2534778C publication Critical patent/CA2534778C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • 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
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • C08J3/126—Polymer particles coated by polymer, e.g. core shell structures
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/14—Water soluble or water swellable polymers, e.g. aqueous gels
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/23—Sheet including cover or casing
    • Y10T428/239—Complete cover or casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/23907—Pile or nap type surface or component
    • Y10T428/23929—Edge feature or configured or discontinuous surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y10T428/2998—Coated including synthetic resin or polymer

Abstract

This invention relates to an absorbent structure that comprises water-swellable material, which comprises water-swellable polymers that are coated with a coating agent said coating agent comprising a phase-separating elastomeric material, which allows swelling of the water-swellable polymers, without breakage of the coating.

Claims (14)

1. An absorbent structure comprising water-swellable material that comprises water-swellable polymers, coated with a coating agent, wherein said coating agent comprises an elastomeric material that is phase-separating and has at least a first phase with a first glass transition temperature Tg1 and a second phase with a second glass transition temperature Tg2, preferably the difference between Tg1 and Tg2 being at least 30°C.
2. An absorbent structure comprising water-swellable material that comprises water-swellable polymers, coated with a coating agent, said material being obtainable by a process comprising the steps of::
a. obtaining water-swellable polymer particles;
b. simultaneously with or subsequently to step a), applying a coating agent to at least a part of said water-swellable polymer particles; and optionally the step of c. annealing the resulting coated water-swellable polymer particles of step b), to obtain the water-swellable material whereby said coating agent of step b) comprises an elastomeric phase-separating material that has at least a first phase with a first glass transition temperature Tg1 and a second phase with a second glass transition temperature Tg2, preferably the difference between Tg1 and Tg2 being at least 30°C.
3. An absorbent structure as in claim 2, whereby the water-swellable material is obtainable by said process whereby in step b) said coating agent and/ or said elastomeric material is wet-extensible and has a wet-elongation at break of at least 400% and a tensile stress at break in the wet state of at least 1MPa, or even at least 5MPa.
4. An absorbent structure as in claim 3, whereby the water-swellable material is obtainable by said process whereby in step b) the coating agent and / or the wet-extensible, elastomeric material has, in the wet state, a wet secant elastic modulus at 400%
elongation (extension) of at least 0.5 MPa, preferably at least 0.75 MPa, most preferably at least about 3MPa.
5. An absorbent article as in claim 4, whereby the water-swellable material is obtainable by said process whereby in step b) the coating agent and/ or the wet-extensible, elastomeric material has, in the dry state, a dry secant modulus at 400% elongation (SM dry400%) and a wet secant modulus at 400% elongation (SM wet400%) , whereby the ratio of SM wet400% to SM dry400% is between 1.4 to 0.6.
6. An absorbent structure as in any of claims 2 to 5, whereby the water-swellable material is obtainable by said process whereby in step b) said coating agent and/ or said elastomeric material has a Moisture Vapour Transmission Rate (MVTR) of at least 800g/m2/day, or preferably of at least 1500g/m2/day, or even more preferably a MVTR of at least 2100g/m2/day.
7. An absorbent structure as in any preceding claim, whereby said elastomeric phase-separating material has a Tg1 of less than 20°C, preferably less than 0°C
and a Tg2 of more than 50°C, or even more than 60°C.
8. An absorbent structure as in any preceding claim, whereby the elastomeric material is a block copolymeric material, having a molecular weight of at least 50 kDa, preferably at least 70 kDa.
9. An absorbent structure as in claim 8, whereby said coating agent comprises one or more block copolymers of polyurethanes-co-polyethers, polyurethanes-co-polyesters, polyurethane/ureas-co-polyethers, polyurethane/ureas-co-polyester, polystyrene block copolymers.
10. An absorbent structure as in any preceding claim, whereby the coating agent is present in the form of a continuous shell around said water-swellable polymer particle, said shell having an average caliper of 1µm to 50µm, more preferably lam to 20µm or even more preferably 2 to 10µm.
11. An absorbent structure as in claim 10 whereby said shell is uniform with the ratio of smallest to largest caliper from 1:1 to 1:3, preferably from 1:1 and 1:2.
12. An absorbent structure as in any preceding claim which is, or is a part of, a disposable absorbent article, selected from infant diapers, training pants, adult incontinent articles, sanitary napkins, panty-liners, interlabial articles and bandages.
13. An absorbent structure according to any preceding claim obtainable by a) providing a first substrate wrapping material;
b) depositing said water-swellable material onto a first surface of a substrate material, preferably in a pattern comprising at least one zone which is substantially free of water-swellable material, and the pattern comprising at least one zone comprising water-swellable material, preferably such that openings are formed between the separate zones with water-swellable material; optionally c) depositing a thermoplastic material onto said first surface of the substrate material and onto the water-swellable material, such that portions of the thermoplastic material are in direct contact with the first surface of the substrate and portions of the thermoplastic material are in direct contact with the water-swellable material;
d) folding the substrate material over, to cover the water-swellable material on the substrate material of step b) or c); and/ or placing another substrate wrapping matter over the water-swellable material on the substrate material of step b) or c).
14. A disposable absorbent article comprising a topsheet and a backsheet and therein between the absorbent structure according to any preceding claim.
CA2534778A 2003-08-06 2004-08-05 Absorbant structures comprising coated water-swellable material Expired - Fee Related CA2534778C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US49289903P 2003-08-06 2003-08-06
US49281903P 2003-08-06 2003-08-06
US60/492,899 2003-08-06
US60/492,819 2003-08-06
PCT/US2004/025837 WO2005014065A1 (en) 2003-08-06 2004-08-05 Absorbant structures comprising coated water-swellable material

Publications (2)

Publication Number Publication Date
CA2534778A1 true CA2534778A1 (en) 2005-02-17
CA2534778C CA2534778C (en) 2010-11-16

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Family Applications (2)

Application Number Title Priority Date Filing Date
CA2534778A Expired - Fee Related CA2534778C (en) 2003-08-06 2004-08-05 Absorbant structures comprising coated water-swellable material
CA 2534914 Abandoned CA2534914A1 (en) 2003-08-06 2004-08-05 Water-swellable material comprising coated water-swellable polymers

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA 2534914 Abandoned CA2534914A1 (en) 2003-08-06 2004-08-05 Water-swellable material comprising coated water-swellable polymers

Country Status (8)

Country Link
US (3) US7049000B2 (en)
EP (2) EP1654012B1 (en)
JP (2) JP4689606B2 (en)
KR (1) KR20060060001A (en)
BR (1) BRPI0413298A (en)
CA (2) CA2534778C (en)
MX (2) MXPA06001298A (en)
WO (2) WO2005014065A1 (en)

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