CA2620643A1 - Absorbent articles comprising surface cross-linked superabsorbent polymer particles made by a method using vacuum ultraviolet radiation - Google Patents

Absorbent articles comprising surface cross-linked superabsorbent polymer particles made by a method using vacuum ultraviolet radiation Download PDF

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Publication number
CA2620643A1
CA2620643A1 CA002620643A CA2620643A CA2620643A1 CA 2620643 A1 CA2620643 A1 CA 2620643A1 CA 002620643 A CA002620643 A CA 002620643A CA 2620643 A CA2620643 A CA 2620643A CA 2620643 A1 CA2620643 A1 CA 2620643A1
Authority
CA
Canada
Prior art keywords
drum
superabsorbent polymer
polymer particles
absorbent article
irradiation source
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
CA002620643A
Other languages
French (fr)
Other versions
CA2620643C (en
Inventor
Andreas Flohr
Torsten Lindner
Esther Oliveros
Yoshiro Mitsukami
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
Andreas Flohr
Torsten Lindner
Esther Oliveros
Yoshiro Mitsukami
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
Priority claimed from EP05018309A external-priority patent/EP1757642A1/en
Application filed by The Procter & Gamble Company, Andreas Flohr, Torsten Lindner, Esther Oliveros, Yoshiro Mitsukami filed Critical The Procter & Gamble Company
Publication of CA2620643A1 publication Critical patent/CA2620643A1/en
Application granted granted Critical
Publication of CA2620643C publication Critical patent/CA2620643C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/04—After-treatment of articles without altering their shape; Apparatus therefor by wave energy or particle radiation, e.g. for curing or vulcanising preformed articles
    • 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
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • 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
    • C08J3/28—Treatment by wave energy or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/251—Particles, powder or granules
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S526/931—Pressure sensitive adhesive
    • 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
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • 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

Abstract

The present invention relates to absorbent articles comprising surface cross-linked superabsorbent polymer (SAP) particles, the SAP particles being made by a method using UV irradiation. The method is carried out in a so-called drum reactor, which comprises a hollow drum and an irradiation source. The drum has a longitudinal axis and a cross-section. Superabsorbent polymer particles are fed into the drum and are irradiated while they move within the drum, which is rotated around its longitudinal axis. The irradiation source is provided such that the radiation emitted by the irradiation source is able to reach superabsorbent polymer particles within said drum. The irradiation source for use in the method of the present invention is able to emit UV radiation of a wavelength between 100 nm and 200 nm.

Claims (13)

1. An absorbent article comprising surface cross-linked superabsorbent polymer (SAP) particles, said superabsorbent polymer particles being made by a method, comprising the steps of:

a) providing superabsorbent polymer particles;

b) providing a reactor (10) comprising a drum (20), said drum (20) having a longitudinal axis (30) and further having a cross-section, wherein an irradiation source (40) is provided such that the radiation emitted by said irradiation source (40) is able to reach superabsorbent polymer particles within said drum (20), said irradiation source (40) being able to emit UV radiation of a wavelength between 100 nm and nm;

c) feeding said superabsorbent polymer particles into said drum (20);

d) moving said superabsorbent polymer particles in said drum (20) by rotating said drum (20) around its longitudinal axis (30);

e) said superabsorbent polymer particles being irradiated by said irradiation source (40) as the superabsorbent polymer particles are moved within said drum (20);
and f) collecting said superabsorbent polymer particles leaving the drum (20).
2. The absorbent article of claim 1 wherein in said method said irradiation source (40) is arranged within said drum (20).
3. The absorbent article of claim 2 wherein in said method said irradiation source (40) is arranged along said longitudinal axis (30), parallel to said longitudinal axis (30) or at an angle or arc relative to said longitudinal axis (30).
4. The absorbent article according to any of the preceding claims, wherein in said method the distance between said irradiation source (40) and said superabsorbent polymer particles being within said drum is from 2 mm to 150 mm.
5. The absorbent article according to any of the preceding claims wherein in said method said drum (20) is round or ellipsoid shaped or is polygonal shaped with the number of angles being more than 6.
6. The absorbent article, according to any of claims 2 to 5 wherein in said method a screen (100) is mounted above said irradiation source (40).
7. The absorbent article according to any of the preceding claims, wherein in said method said drum (20) rotates at a speed of from 1 rpm to 180 rpm.
8. The absorbent article according to any of the preceding claims wherein in said method the UV irradiation is carried out at a temperature of from 20°C to 99°C.
9. The absorbent article according to any of the preceding claims, wherein in said method radical former molecules are applied onto said superabsorbent polymer particles prior to UV irradiation.
10. The absorbent article according to claims 9, wherein in said method said radical formers are water-soluble and are applied in an aqueous solution.
11. The absorbent article according to claim 10, wherein in said method said radical former is sodium peroxodisulfate.
12. The absorbent article according to any of the preceding claims, wherein in said method additional surface cross-linking molecules are applied onto said superabsorbent polymer particles prior to UV irradiation, said surface cross-linking molecules having at least two functional groups, wherein said functional groups are C=C double bonds or are CH-X moieties, with X being a hetero atom.
13. The absorbent article according to any of the preceding claims wherein in said method said superabsorbent polymer particles are fed into said drum continuously and wherein said superabsorbent polymer particles leave said drum continuously.
CA2620643A 2005-08-23 2006-08-23 Absorbent articles comprising surface cross-linked superabsorbent polymer particles made by a method using vacuum ultraviolet radiation Active CA2620643C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP05018309.4 2005-08-23
EP05018309A EP1757642A1 (en) 2005-08-23 2005-08-23 Method of surface cross-linking superabsorbent polymer particles using vacuum ultraviolet radiation
EP06012827A EP1757644B1 (en) 2005-08-23 2006-06-22 Vacuum ultraviolet radiation for surface postcrosslinking suberabsorbent polymer particles
EP06012827.9 2006-06-22
PCT/US2006/032885 WO2007024926A1 (en) 2005-08-23 2006-08-23 Absorbent articles comprising surface cross-linked superabsorbent polymer particles made by a method using vacuum ultraviolet radiation

Publications (2)

Publication Number Publication Date
CA2620643A1 true CA2620643A1 (en) 2007-03-01
CA2620643C CA2620643C (en) 2011-05-10

Family

ID=37670366

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2620643A Active CA2620643C (en) 2005-08-23 2006-08-23 Absorbent articles comprising surface cross-linked superabsorbent polymer particles made by a method using vacuum ultraviolet radiation

Country Status (3)

Country Link
US (1) US7576138B2 (en)
CA (1) CA2620643C (en)
WO (1) WO2007024926A1 (en)

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EP1629854B1 (en) * 2004-07-20 2010-10-13 The Procter & Gamble Company Surface cross-linked superabsorbent polymer particles and methods of making them
US8080705B2 (en) * 2004-07-28 2011-12-20 The Procter & Gamble Company Superabsorbent polymers comprising direct covalent bonds between polymer chain segments and method of making them
EP1669394A1 (en) * 2004-12-10 2006-06-14 The Procter & Gamble Company Superabsorbent polymer particles with improved surface cross-linking and hydrophilicity and method of making them
US20060128827A1 (en) * 2004-12-10 2006-06-15 The Procter & Gamble Company Absorbent members comprising modified water absorbent resin for use in diapers
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EP1757648A1 (en) 2005-08-23 2007-02-28 Nippon Shokubai Co.,Ltd. Disclosure of a method of surface cross-linking superabsorbent polymer particles using ultraviolet radiation and Brönsted acids
EP1757643A1 (en) * 2005-08-23 2007-02-28 Nippon Shokubai Co.,Ltd. Method of surface cross-linking superabsorbent polymer particles using vacuum ultraviolet radiation
WO2007024927A2 (en) * 2005-08-23 2007-03-01 The Procter & Gamble Company Absorbent articles comprising surface cross-linked superabsorbent polymer particles made by a method using ultraviolet radiation
EP1757645A1 (en) * 2005-08-23 2007-02-28 Nippon Shokubai Co.,Ltd. Disclosure of a method of surface cross-linking highly neutralized superabsorbent polymer particles using Bronstedt acids
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Also Published As

Publication number Publication date
WO2007024926A1 (en) 2007-03-01
US7576138B2 (en) 2009-08-18
US20070048516A1 (en) 2007-03-01
CA2620643C (en) 2011-05-10

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