Organosilicone resin coating compositions

Claim 1

A composition comprising: (A) 100 parts by weight of a hydroxyl functional organosiloxane resin copolymer comprised of at least two units selected from the group consisting of MeSiO 3/2 units, Me 2 SiO 2/2 units. PhMeSiO 2/2 units. PhSiO 3/2 units, Ph 2 SiO 2/2 units and PrSiO 3/2 units, in which Me denotes a methyl radical, Ph denotes a phenyl radical and Pr denotes a propyl radical, said resin copolymer having 0.5 to 6 weight percent residual hydroxyl radicals attached to the silicon atoms thereof, a total molar organic group to silicon ratio of 1 to 1.7 and a total molar phenyl group to silicon ratio of 0.35 to 0.85; and (B) from about 1 to 100 parts by weight of a liquid silicone resin composition prepared by a process comprising (I) reacting a mixture consisting essentially of (i) a phenylsilane having the general formula PhSi(OR).sub.3 wherein R is selected from the group consisting of methyl, ethyl, propyl and acetyl radicals and Ph denotes a phenyl radical, (ii) a polydimethylsiloxane and (iii) an equilibrating amount of an acid catalyst having the formula ZSO.sub.3 H wherein Z is a perfluoroalkyl group having 1 to 10 carbon atoms, molar ratio of said polydimethylsiloxane (ii) to said phenylsilane (i) being between about 1:9 and about 9:1, (II) hydrolyzing the reaction product formed in step (I) with sufficient water to provide from about 0.5 to about 1 mole of residual--OR functionality per 100 parts by weight of said liquid silicone resin and (III) neutralizing said acid catalyst (iii).