IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0890090
(2007-08-03)
|
| 등록번호 |
US-8287999
(2012-10-16)
|
|
발명자
/ 주소 |
- Schmidt, Mattias
- Meyer, Axel
- Fossum, Renae Dianna
- Autran, Jean-Philippe Marie
- Riegel, Ulrich
- Daniel, Thomas
- Bruhns, Stefan
- Elliott, Mark
- Haeberle, Karl
|
| 출원인 / 주소 |
- The Procter & Gamble Company
|
| 대리인 / 주소 |
|
| 인용정보 |
피인용 횟수 :
6 인용 특허 :
109 |
초록
▼
The present invention relates to an absorbent structure suitable in, or being an adult or infant diaper or feminine hygiene article, comprising a water-absorbing material comprising water-absorbing particles that comprise a film coating, comprising an elastic film-forming polymer and an antioxidant.
The present invention relates to an absorbent structure suitable in, or being an adult or infant diaper or feminine hygiene article, comprising a water-absorbing material comprising water-absorbing particles that comprise a film coating, comprising an elastic film-forming polymer and an antioxidant. The invention also relates to an absorbent structure comprising a water absorbent material obtainable by a process of: a) spray-coating water-absorbing polymeric particles with an elastic film-forming polymer in a fluidized bed reactor at a temperature in the range from 0° C. to 150° C. andb) heat-treatment of the coated polymeric particles at a temperature above 50° C.,wherein in step a) and/or b) an antioxidant is added.
대표청구항
▼
1. An absorbent structure for use in an adult or infant diapers or feminine hygiene articles, the absorbent structure comprising a water-absorbing material, the water-absorbing material comprising a plurality of discrete water-absorbing particles, wherein at least some of the discrete water absorben
1. An absorbent structure for use in an adult or infant diapers or feminine hygiene articles, the absorbent structure comprising a water-absorbing material, the water-absorbing material comprising a plurality of discrete water-absorbing particles, wherein at least some of the discrete water absorbent particles are coated by a water-insoluble film coating comprising an elastic film-forming polyurethane, from 1.0% to 3.0% by weight of a coalescing agent, and an antioxidant, and wherein the water-absorbing material has a CCRC and a CRC of not less than 25 g/g. 2. The absorbent structure of claim 1, wherein the film coating is a heat-treated or annealed film coating. 3. The absorbent structure of claim 1, wherein the water-absorbing particles are post-crosslinked. 4. The absorbent structure of claim 1, wherein the elastic film-forming polymer is a polyurethane dispersion blended with at least one polymer dispersion selected from the group consisting of poly-co(ethylene-vinylacetate), polyacetal, and homo- and copolymers of acrylonitrile, butadiene, styrene, (meth-) acrylate, isoprene, and vinylpyrrolidone. 5. The absorbent structure of claim 1, wherein the antioxidant comprises a hindered phenol, secondary aromatic amine, certain sulfide ester, trivalent phosphorus compound, hindered amine, metal dithiocarbamate, a metal dithiophosphate, or mixture(s) thereof. 6. The absorbent structure of claim 1, wherein the antioxidant comprises one or more alkylated monophenols, hydroquinones, alkylated hydroquinones, tocopherol and its derivatives, chromanol and its derivatives, ascorbic acid, and Irganox 1010. 7. The absorbent structure of claim 1, wherein the film-coating comprises a deagglomerating aid. 8. The absorbent structure of claim 1, wherein the film coating is homogeneous. 9. The disposable absorbent structure of claim 1, comprising an absorbent core that comprises the water-absorbing material and less than 20% by weight (of the water-absorbing material) of fibrous absorbent material, the core being substantially free of absorbent fibrous material. 10. The disposable absorbent structure of claim 9, wherein the absorbent core comprises (fibrous) adhesive or thermoplastic material. 11. The disposable absorbent structure of claim 1, wherein the water-absorbing material has a CS-SFC of at least 350×10−7 cm3s/g. 12. An absorbent structure comprising a water absorbent material obtainable by a process of: a) spray-coating water-absorbing polymeric particles with an elastic film-forming polymer in a fluidized bed reactor at a temperature in the range from 0° C. to 150° C.;b) heat-treatment of the coated polymeric particles at a temperature above 50° C.; wherein in step a) and/or b) an antioxidant and a coalescing agent are added; andwherein the resulting coating is water-insoluble and comprises from 1.0% to 3.0% by weight of the coalescing agent. 13. The absorbent structure of claim 12, wherein the heat-treatment of step b) is carried out at a temperature in the range from 100° to 200° C., and wherein the duration of the heat-treatment is chosen that the CS-SFC value of the obtained polymeric particles is at least 10% of the optimum CS-SFC value. 14. The absorbent structure of claim 12, wherein the water-absorbing polymeric particles are post-crosslinked. 15. The absorbent structure of claim 12, wherein the elastic film-forming polymer is a polyurethane dispersion blended with at least one polymer dispersion selected from the group consisting of poly-co(ethylene-vinylacetate), polyacetal, and homo- and copolymers of acrylonitrile, butadiene, styrene, (meth-) acrylate, isoprene, and vinylpyrrolidone. 16. The absorbent structure of claim 12, wherein the antioxidant comprises a hindered phenol, secondary aromatic amine, certain sulfide ester, trivalent phosphorus compound, hindered amine, metal dithiocarbamate, metal dithiophosphate, or mixture(s) thereof. 17. The absorbent structure of claim 16, wherein the antioxidant comprises one or more alkylated monophenols, hydroquinones, alkylated hydroquinones, tocopherol and its derivatives, chromanol and its derivatives, ascorbic acid, and Irganox 1010. 18. The absorbent structure of claim 12, wherein the heat-treatment of step b) is carried out at a temperature in the range from 100° to 200° C., and wherein the duration of the heat-treatment is chosen that the CS-SFC value of the obtained polymeric particles is at least 10% of the optimum CS-SFC value.
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