Patent ID: 6541107
Filing Date: 2003-04-01
Classification: C08G,C09D,Y10T

Abstract:
A method for making a nanoporous silicone resin coating on a substrate comprising the steps of(a) coating on to a substrate a silicone resin comprising the reaction product of a mixture comprising (A) 15-70 mol % of a tetraalkoxysilane described by formula Si(OR1)4, where each R1 is an independently selected alkyl group comprising 1 to about 6 carbon atoms, (B) 12 to 60 mol % of a hydrosilane described by formula HSiX3, â€ƒwhere each X is an independently selected hydrolyzable group, (C) 15 to 70 mole percent of an organotrialkoxysilane described by formula R2Si(OR3)3, â€ƒwhere R2 is a hydrocarbon group comprising about 8 to 24 carbon atoms or a substituted hydrocarbon group comprising a hydrocarbon chain having about 8 to 24 carbon atoms and each R3 is and independently selected alkyl group comprising 1 to about 6 carbon atoms; in the presence of (D) water, (E) hydrolysis catalyst, and (F) organic solvent for the reaction product and (b) heating the coated substrate a temperature sufficient to effect curing of the silicone resin and thermolysis of R2 groups from silicon atoms thereby forming a nanoporous silicone resin coating on the substrate.