Patent ID: 7022379
Filing Date: 2006-04-04
Classification: A61L,B05D,C08J,G02B

Abstract:
1. A method of coating a polymeric substrate comprising the steps of: forming a solution, said solution containing a polyanionic material having a plurality of negatively charged groups along a polymer chain and a polycationic material having a plurality of positively charged groups along a polymer chain in an amount such that the molar charge ratio of said solution is from about 3:1 to about 100:1; maintaining the pH of said solution within a range so that said polyanionic material and said polycationic material remain stable within said solution; and applying said solution to said substrate to form a coating thereon, said coating on said substrate having at least two layers so that one of said layers comprises said polyanionic material and another of said layers comprises said polycationic material.