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Method of providing a substrate with a hydrophilic coating and substrates, particularly medical devices, provided with such coatings

  • US 5,702,754 A
  • Filed: 02/22/1995
  • Issued: 12/30/1997
  • Est. Priority Date: 02/22/1995
  • Status: Expired due to Term
First Claim
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1. A method of providing a substrate, with a hydrophilic coating which becomes lubricous when contacted with an aqueous fluid, said method comprising:

  • a) coating said substrate with a first aqueous coating composition comprising an aqueous dispersion or emulsion of a polymer having organic acid functional groups and an excess of a polyfunctional cross-linking agent having functional groups being capable of reacting with organic acid groups, and drying said first coating composition to obtain a substantially water-insoluble coating layer still including functional groups being reactive with organic acid groups, andb) forming a continuous lubricious surface over said first coating composition by contacting said dried first coating composition with a second aqueous coating composition comprising an aqueous solution or dispersion of a hydrophilic polymer having organic acid functional groups, and drying the combined coatings, to bond the hydrophilic polymer to the polymer of the first coating composition through said excess cross-linking agent.

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