Coated substrate having a low coefficient of friction hydrophilic coating and a method of making the same
AssigneeBiosearch Medical Products Inc.
InventorsMichael J. Micklus, David T. Ou-Yang
Life of this patent
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Abstract
A substrate is coated with a polyvinylpyrollidone-polyurethane interpolymer. In the method, a polyisocyanate and a polyurethane in a solvent such as methyl ethyl ketone are applied to a substrate and the solvent evaporated. If the substrate is a polyurethane, only the polyisocyanate need be employed. Polyvinylpyrollidone in a solvent is then applied to the treated substrate and the solvent evaporated. The invention is applied, for example, to a tube such as a catheter, a condom and a peristaltic pump tube.
Claims8
The method of placing on a substrate a hydrophilic coating which has a low coefficient of friction when wetted with a water based liquid comprising:
- applying to the substrate a solution having from about 0.4% to about 5% (weight to volume). polyisocyanate and from about 0.3% to about 10% (weight to volume). polyurethane,
- evaporating the solvent,
- applying a solution having from about 0.5% to about 10% (weight to volume). polyvinylpyrollidone to the thus treated substrate and then evaporating the solvent of the last mentioned solution to form a polyvinyl pyrollidone-polyurethane interpolymer.
The method of placing on a polyurethane substrate a hydrophilic coating which has a low coefficient of friction when wetted with a water based liquid comprising:
- applying to the substrate a solution having from about 0.4% to about 5% (weight to volume) polyisocyanate,
- evaporating the solvent,
- applying a solution having from about 0.5% to about 10% (weight to volume) polyvinylpyrollidone to the thus treated substrate and then evaporating the solvent to form a polyvinylpyrollidone polyurethane interpolymer.
Dependencies are inferred from the claim text.