Patent ID: 6124388
Filing Date: 2000-09-26
Classification: C08L,C09D,C09K

Abstract:
A coating composition having a water contact angle of at least 150.degree. and having prolonged water repellent properties, consisting essentially of:from 80 to 90% by volume of a fluorocarbon polymer powder comprised of a fluorocarbon polymer which has an average molecular weight ranging from 500 to 20,000, which has substantially completely fluorinated terminal groups and is prepared in an atmosphere having an oxygen concentration not higher than 0.1% so that groups in the polymer chain capable of forming hydrogen bonds with molecules of water are minimized, and which is selected from the group consisting of polytetrafluoroethylene, tetrafluoroethylene/hexafluoropropylene coploymer, polyvinylidene fluoride and mixtures thereof;a binder comprised of a polymeric material which has a surface free energy which is different from that of the fluorocarbon polymer powder and which is at least one polymer selected from the group consisting of polyvinylidene fluoride, acrylic silicone resin, polyester resin, ethylene/carbon monoxide copolymer, ethylene/vinylketone copolymer, propylene/vinylketone copolymer, and styrene/vinylketone copolymer; andan additive comprising a substance which is selected from the group consisting of a fluoro oil, a surfactant, and a mixture thereof, which has a surface free energy which is less than that of said binder and which exceeds that of said fluorocarbon polymer powder so that wetability of the fluorocarbon polymer powder with the binder is improved and gap formation there between reduced.