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Porous absorbent materials having modified surface characteristics and methods for making the same

  • US 5,985,432 A
  • Filed: 01/06/1997
  • Issued: 11/16/1999
  • Est. Priority Date: 02/17/1994
  • Status: Expired due to Fees
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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