Patent ID: 6270902
Filing Date: 2001-08-07
Classification: A61L,B05D,C09D,Y10T

Abstract:
A two step method or process for improving the adherence or bonding of a lubricious coating of a crosslinked polyurethane, polyurea or polyurethaneurea/PEO or PVP coating to a substrate surface, said two step method comprising a first step of subjecting said surface to a surface preparation which results in the treated surface being provided with a functional tie layer containing functional groups capable of forming covalent bonds with functional groups of a reaction mixture to be applied in a subsequent second step, which reaction mixture comprises a molecule having at least two unreacted isocyanate groups per molecule and PEO or PVP and which reaction mixture upon curing forms a crosslinked polyurethane, polyurea or polyurethaneurea/PEO or PVP coating and a second step of applying to said tie layer said reaction mixture, forming a covalent bond between said tie layer and said reaction mixture and curing the reaction mixture.