IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0912004
(2004-08-05)
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등록번호 |
US-7427437
(2008-09-23)
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발명자
/ 주소 |
- Schmidt,Mattias
- Meyer,Axel
- Fossum,Renae Dianna
- Ehrnsperger,Bruno Johannes
- Goldman,Stephen Allen
- Divo,Michael
- Urankar,Edward Joseph
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출원인 / 주소 |
- The Procter & Gamble Company
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
34 |
초록
▼
This invention is directed to absorbent structures and preferred absorbent articles, comprising solid, typically particulate, water-swellable material that comprises coated water-swellable, preferably hydrogel-forming polymers, which are coated with a coating agent, which is such that it does not ru
This invention is directed to absorbent structures and preferred absorbent articles, comprising solid, typically particulate, water-swellable material that comprises coated water-swellable, preferably hydrogel-forming polymers, which are coated with a coating agent, which is such that it does not rupture when the polymers swell in a liquid, e.g., water or saline water. Hereto, the coating agent is extensible in wet state and comprises thereto a wet-extensible material that has a tensile stress at break in the wet state of at least 1 MPa. Typically, the coating agent comprises thereto an elastomeric polymeric material.
대표청구항
▼
What is claimed is: 1. An absorbent structure comprising a water-swellable material, that comprises coated water-swellable polymers, the water-swellable material being obtainable by a process, comprising the steps of: a) obtaining water-swellable polymers; and b) applying at least 1% by weight of t
What is claimed is: 1. An absorbent structure comprising a water-swellable material, that comprises coated water-swellable polymers, the water-swellable material being obtainable by a process, comprising the steps of: a) obtaining water-swellable polymers; and b) applying at least 1% by weight of the resulting water-swellable material, of a coating agent, said coating agent comprising a material that has a tensile stress at break in the wet state of at least 1 MPa and a wet secant elastic modulus at 400% elongation (SMwet400%) of at least 0.25 MPa, to at least part of said water-swellable polymers to obtain the water-swellable material comprising coated water-swellable polymers. 2. An absorbent structure comprising a water-swellable material, that comprises coated water-swellable polymers, the water-swellable material being obtainable by a process, comprising the steps of: a) obtaining water-swellable polymers; and b) applying at least 1% by weight of the resulting water-swellable material, of a coating agent, said coating agent comprising a material that has a tensile stress at break in the wet state of at least 1 MPa and a wet secant elastic modulus at 400% elongation (SMwet400%) of at least about 0.5 MPa, to at least part of said water-swellable polymers to obtain the water-swellable material comprising coated water-swellable polymers. 3. An absorbent structure according to claim 2, wherein the water-swellable material is solid, and obtainable by a process wherein the water-swellable polymers of step a) are in particulate form. 4. An absorbent structure according to claim 2, wherein the coating agent has a wet-elongation to break of at least 400%. 5. An absorbent structure according to claim 2, wherein the coating agent has a tensile stress at break in the wet state of at least 3 MPa. 6. An absorbent structure according to claim 2, wherein the coating agent has, in the wet state a wet secant elastic modulus at 400% elongation (SMwet400%) of at least about 0.75 MPa. 7. An absorbent structure according to claim 2, wherein the water-swellable polymers have a CCRC value of at least 30 g/g. 8. An absorbent structure according to claim 2, wherein the water-swellable polymers of step a) are liquid-containing and at least partially swollen, comprising said liquid at a level of from 0.5 g/g to about 20 g/g. 9. An absorbent structure according to claim 2, wherein the coating agent has a first glass transition temperature Tg of less than 0�� C. 10. An absorbent structure according to claim 2, wherein the coating agent forms a continuous shell around at least a portion of said water-swellable polymer particles, said shell having an average caliper of 1 μm to 50 μm. 11. An absorbent structure according to claim 2, wherein said absorbent structure comprises at least a part of, a disposable absorbent article, wherein said disposable absorbent article is selected from the group consisting of infant diapers, training pants, adult incontinent articles, sanitary napkins, panty-liners, interlabial articles, bandages and the like. 12. An absorbent structure according to claim 2, obtainable by the method of: a) providing a first substrate wrapping material; b) depositing said water-swellable material onto a first surface of the substrate material; 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; and d) covering the deposited water swellable material with a layer using a method selected from the group consisting of folding a portion of the first substrate material over the water swellable material and providing a second substrate wrapping material. 13. A disposable absorbent article comprising a topsheet and a backsheet and having disposed therebetween the absorbent structure according to claim 2. 14. An absorbent structure according to claim 2, wherein said coating agent comprises a polyurethane. 15. An absorbent structure according to claim 14, wherein said coating agent forms a shell around at least a portion of said water-swellable polymers, said shell having an average caliper of 1 μm to 100 μm. 16. An absorbent structure according to claim 2, wherein said water swellable polymers are in the form of particles and said particles have a mass median particle size between 10 μm and 2 mm. 17. An absorbent structure comprising water-swellable material that comprises coated water-swellable polymers, the water-swellable material being obtainable by a process comprising the steps of: a) obtaining water-swellable polymers; and b) applying at least 1% by weight of the resulting water-swellable material, of a coating agent, said coating agent comprising a material that has a tensile stress at break in the wet state of at least 1 MPa and a wet secant elastic modulus at 400% elongation (SMwet400%) of at least about 0.5 MPa, to at least part of said water-swellable polymers; and c) heat treating the resulting coated water-swellable polymers of step b), to obtain the water-swellable material comprising coated water-swellable polymers, wherein the heat treating is selected from the group consisting of annealing, curing and combinations thereof. 18. An absorbent structure according to claim 17, wherein said heat treatment step is an annealing step whereby the coated water-swellable polymers of step b) are heat treated at a temperature of at least 70�� C. 19. An absorbent structure according to claim 17, wherein said heat treatment step is an annealing step whereby the coated water-swellable polymers are heat treated at a temperature of at least 140�� C. for a predetermined time. 20. An absorbent structure according to claim 19, wherein said predetermined time is greater than 2 hours. 21. An absorbent structure according to claim 17, obtainable by the method of: a) providing a first substrate wrapping material; b) depositing said water-swellable material onto a first surface of the substrate material; 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; and d) covering the deposited water swellable material with a layer using a method selected from the group consisting of folding a portion of the first substrate material over the water swellable material and providing a second substrate wrapping material. 22. A disposable absorbent article comprising a topsheet and a backsheet and having disposed therebetween the absorbent structure according to claim 17.
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