Patent ID: 6313045
Filing Date: 2001-11-06
Classification: C08G,C09D,Y10S

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 formulaSi(OR.sup.1).sub.4,where each R.sup.1 is an independently selected alkyl group comprising 1 to about 6 carbon atoms,(B) 12 to 60 mol % of an organosilane described by formulaR.sup.4 SiX.sub.3,where R.sup.4 is selected from the group consisting of alkyl groups comprising 1 to about 6 carbon atoms and phenyl and each X is an independently selected hydrolyzable group,(C) 15 to 70 mole percent of an organotrialkoxysilane described by formulaR.sup.2 Si(OR.sup.3).sub.3,where R.sup.2 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 R.sup.3 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 to a temperature sufficient to effect curing of the silicone resin and thermolysis of R.sup.2 groups from silicon atoms thereby forming a nanoporous silicone resin coating on the substrate.