Porous absorbent materials having modified surface characteristics and methods for making the same
First Claim
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1. A porous absorbent material having walls surrounding and defining cellular voids, and having modified surface characteristics, said material comprising:
- a water-insoluble, water-swellable polymer;
a positive-charge supplying compound bonded to the water-insoluble, water-swellable polymer; and
a hydrophilic compound bonded to said water-insoluble, water-swellable polymerwherein said absorbent material has been freeze dried so that said material is in the form of discrete platelets, flakes or sheets when viewed microscopically, each of said platelets, flakes or sheets, having said cellular voids, and the contact angle of blood on a surface of said absorbent material is from about 0 to about 40 degree.
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Abstract
A porous absorbent material that comprises a water-insoluble, water-swellable absorbent polymer. The absorbent material comprises a polyether and/or a polycation bonded to the absorbent polymer whereby the contact angle of blood on a surface of the absorbent material attains from about 0 degree to about 40 degree. Because of the improved wettability with liquids as well as the porous structure, the absorbent material can provide higher absorbent characteristics with liquids, in particular with blood.
124 Citations
29 Claims
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1. A porous absorbent material having walls surrounding and defining cellular voids, and having modified surface characteristics, said material comprising:
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a water-insoluble, water-swellable polymer; a positive-charge supplying compound bonded to the water-insoluble, water-swellable polymer; and a hydrophilic compound bonded to said water-insoluble, water-swellable polymer wherein said absorbent material has been freeze dried so that said material is in the form of discrete platelets, flakes or sheets when viewed microscopically, each of said platelets, flakes or sheets, having said cellular voids, and the contact angle of blood on a surface of said absorbent material is from about 0 to about 40 degree. - View Dependent Claims (3, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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2. A porous absorbent material having walls surrounding and defining cellular voids, and having modified surface characteristics, said material comprising:
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a water-insoluble, water-swellable polymer; a positive-charge supplying compound bonded to the water-insoluble, water-swellable polymer; and a non-ionic hydrophilic compound bonded to said water-insoluble, water-swellable polymer; wherein said absorbent material has been freeze dried so that said material is in the form of discrete platelets, flakes or sheets when viewed microscopically, each of said platelets, flakes or sheets, having said cellular voids, and the contact angle of blood on a surface of said absorbent material is from about 0 to about 40 degree. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification