Patent ID: 6673453
Filing Date: 2004-01-06
Classification: A61L,Y10T

Abstract:
In a system comprising a substrate having a bilaminar coating, the bilaminar coating comprising a base coat which is firmly adhered to the substrate, and a top-coat, the top-coat being chemically grafted to the base coat, the top-coat being hydrophilic, lubricious, and biocompatible,the improvement wherein the base coat comprises an aqueous acrylic emulsion polymer, the polymer comprising at least one monomer having an alkyl group, wherein the polymer has an Equivalent Alkyl Number in a range of about 3.5 to about 4.5, the Equivalent Alkyl Number being defined by EAN=n1&it;N1+n2&it;N2+â€¦+nm&it;NmN1+N2+â€¦+Nmâ€ƒwhere ni is a number of carbon atoms in an alkyl group of monomer i, and Ni is a number of moles of monomer i in the polymer, and where m is a positive integer, the base coat also comprising functional groups capable of grafting the emulsion polymer to the top-coat.