IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0542497
(1995-10-13)
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발명자
/ 주소 |
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출원인 / 주소 |
- The Procter & Gamble Company
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
58 인용 특허 :
73 |
초록
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Foams capable of absorbing blood and blood-based fluids, especially menses. These absorbent foams have high capillary absorption pressures required of absorbents used in catamenial products, yet have sufficient openness to allow free movement of the insoluble components in blood-based fluids such as
Foams capable of absorbing blood and blood-based fluids, especially menses. These absorbent foams have high capillary absorption pressures required of absorbents used in catamenial products, yet have sufficient openness to allow free movement of the insoluble components in blood-based fluids such as menses. These absorbent foams are made by polymerizing high internal phase emulsions (HIPEs) where the volume to weight ratio of the water phase to the oil phase is in the range of from about 20:1 to about 125:1. These foams are particularly useful as absorbent members for catamenial pads.
대표청구항
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[ What is claimed is:] [1.] A process for the preparation of an absorbent polymeric foam material capable of absorbing blood and blood-based fluids, which comprises the steps of: forming a water-in-oil emulsion under from:a) from about 85 to about 98% by weight of a monomer component capable of form
[ What is claimed is:] [1.] A process for the preparation of an absorbent polymeric foam material capable of absorbing blood and blood-based fluids, which comprises the steps of: forming a water-in-oil emulsion under from:a) from about 85 to about 98% by weight of a monomer component capable of forming a copolymer having a Tg of about 50.degree. C. or lower, the monomer component comprising:i) from about 45 to about 70% by weight of at least one substantially water-insoluble monofunctional monomer capable of forming an atactic amorphous polymer having a Tg of about 35.degree. C. or lower;ii) from about 10 to about 40% by weight of at least one substantially water-insoluble monofunctional comonomer capable of imparting toughness about equivalent to that provided by styrene;iii) from about 5 to about 25% by weight of a first substantially water-insoluble, polyfunctional crosslinking agent selected from the group consisting of divinylbenzenes, trivinylbenzenes, divinyltoluenes, divinylxylenes, divinylnaphthalcnes divinylalkylbenzenes, divinylphenanthrenes, divinylbiphenyls, divinyidiphenylmethanes, divinylbenzyls, divinylphenylethers, divinyidiphenylsulfides, divinylfurans, divinylsulfide, divinylsulfone, and mixtures thereof; andiv) from 0 to about 15% by weight of a second substantially water-insoluble, polyfunctional crosslinking agent selected from the group consisting of polyfunctional acrylates, methacrylates, acrylamides, methacrylamides, and mixtures thereof; andb) from about 2 to about 15% by weight of an emulsifier component which is soluble in the oil phase and which is suitable for forming a stable water-in-oil emulsion, the emulsion component comprising: (i) a primary emulsifier having at least about 40% by weight emulsifying components selected from diglycerol monoesters of linear unsaturated C.sub.16 -C.sub.22 fatty acids, diglycerol monoesters of branched C.sub.16 -C.sub.24 fatty acids, diglycerol monoaliphatic ethers of branched C.sub.16 -C.sub.24 alcohols, diglycerol monoaliphatic ethers of linear unsaturated C.sub.16 -C.sub.22 alcohols, diglycerol monoaliphatic ethers of linear saturated C.sub.12 -C.sub.14 alcohols, sorbitan monoesters of linear unsaturated C.sub.16 -C.sub.22 fatty acids, sorbitan monoesters of branched C.sub.16 -C.sub.24 fatty acids, sorbitan monoesters of linear saturated C.sub.10 -C.sub.14 fatty acids, and mixtures thereof, or (ii) a combination of a primary emulsifier having at least about 20% by weight of said emulsifying components and a secondary emulsifier in a weight ratio of primary to secondary emulsifier of from about 50:1 to about 1:4, said secondary emulsifier being selected from the group consisting of long chain C.sub.12 -C.sub.22 dialiphatic, short chain C.sub.1 -C.sub.4 dialiphatic quaternary ammonium salts, long chain C.sub.12 -C.sub.22 dialkoyl(alkenoyl)-2-hydroxyethyl, short chain C.sub.1 -C.sub.4 dialiphatic quaternary ammonium salts, long chain C.sub.12 -C.sub.22 dialiphatic imidazolinium quaternary ammonium salts, short chain C.sub.1 -C.sub.4 dialiphatic, long chain C.sub.12 -C.sub.22 monoaliphatic benzyl quaternary ammonium salts, and mixtures thereof; and polymerizing the monomer component in the oil phase of the water-in-oil emulsion to form a polymeric foam material that is capable of acquiring and distributing blood based fluids; washing the polymeric foam material to lower the level of residual electrolytes to less than about 2%; treating the washed foam with an effective amount of a hydrophilizing surfactant; dewatering the washed foam to a moisture content of about 40% or less.
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