Hydrophilic coating and substrate coated therewith
AssigneeTyndale Plains-Hunter, Ltd.
InventorsCharles K. Kliment, George E. Seems
Life of this patent
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Abstract
An article having a lower coefficient of friction in the wet state is produced by applying to a substrate an adherent isocyanate coating followed by a second coating of polyvinylpyrrolidone copolymerized with a minor amount of an ethylenic monomer having active hydrogens and curing the so-coated substrate to effect reaction between the active hydrogens and isocyanate groups. The article is useful in the manufacture of medical devices for insertion in the body.
Claims15
An article having thereon a coating which swells in the presence of aqueous media with concomitant reduction in the coefficient of friction, the said article being produced by:
- applying to a substrate, an adherent coating having free isocyanate groups;
- applying to the so-coated substrate a second coating of a vinyl copolymer having a major polymeric component derived from N-vinylpyrrolidone and a minor polymeric component derived from an ethylenically unsaturated monomer containing reactive hydrogens, and
- heating the coated substrate to curing temperatures to effect reaction between the active hydrogens and isocyanate groups thereby chemically binding the copolymer coating to the adherent isocyanate coating.
Dependencies are inferred from the claim text.