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Lubricious hydrogel coatings

  • US 5,290,585 A
  • Filed: 06/10/1992
  • Issued: 03/01/1994
  • Est. Priority Date: 11/01/1990
  • Status: Expired due to Term
First Claim
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1. A method of preparing a hydrophilic lubricious, organic coating on an organic substrate to be coated;

  • said method comprising forming an organic coating mixture of an isocyanate, a polyol and a polyvinylpyrrolidone in a carrier liquid diluent, said isocyanate containing at least two NCO groups per molecule and the polyol having at least two hydroxy groups per molecule, the sum of the average NCO functionality and the average hydroxy functionality exceeding 4, applying said mixture to the substrate, removing at least a portion of said carrier liquid diluent, and then curing to form a coating of a cross-linked polyurethane and a polyvinylpyrrolidone the ratio by weight of the polyurethane to polyvinylpyrrolidone being from about 0.05 to 3.0.

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