Silicone resins useful for forming mica laminate

Claim 1

A process for forming a silicone resin useful for making mica laminates consisting essentially of (a) adding a mixture of an organotrihalosilane and a dimethyldihalosilane dissolved in a water-immiscible organic solvent to a heterogeneous hydrolysis mixture consisting of water, a water-immiscible organic solvent and an alcohol of the formula R 4 OH for a period of 15 minutes to 4 hours where there is present in the hydrolysis mixture per part by weight of said organotrihalosilane and dimethyldihalosilane 0.4 to 10.0 parts of the water-immiscible organic solvent, 0.2 to 1.0 parts of water and 0.5 to 1.5 parts of said alcohol; (b) continuously during and after said addition, agitating said mixture while maintaining the reaction temperature in the range of 25° C to 80° C (c) adding additional water to form two distinct separate layers, and (d) separating the solvent resin layer where said organo groups on said organotrihalosilane are methyl and phenyl where the concentration of said methyl radicals in said organotrihalosilanes varies from 30 to 70 mole percent and R 4 is selected from the class consisting of alkyl radicals haloalkyl radicals from 1 to 3 carbon atoms where the organo and methyl to Si ratio in said resin varies from 1.01 to 1 to 1.1 to 1, the alkoxy content is less than 6% and said resin has a silanol content of less than 6%.