Patent ID: 6844030

Claim:
A process for modifying a polymeric substrate surface comprising: a) providing a polymeric substrate comprising a fluoropolymer and having first and second major surfaces; b) contacting a photoreactive solution comprising at least one solvent and at least one inorganic photochemical electron donor with the first major surface to form an interface, wherein the second major surface remains substantially uncoated by the photoreactive solution; and c) exposing the interface to actinic radiation; wherein the inorganic photochemical electron donor comprises a soluble non-volatile salt selected from the group consisting of thiocyanate salts, disulfide salts, tetrasulfide salts, thiocarbonate salts, thiooxalate salts, thiophosphate salts, dithionite salts, selenocyanate salts, selenide salts, and azide salts.