Abstract: A method for hydrolyzing chlorosilanes having at least three chlorine atoms bonded to each silicon atom to form silicone resins. The method comprises adding at least one of hydridotrichlorosilane, tetrachlorosilane, or organotrichlorosilane to a two-phase mixture comprising a non-polar organic solvent, an aqueous phase comprising 0 to about 43 weight percent hydrochloric acid, and a surface active compound selected from the group consisting of organosulfates described by formula R2SO4H and alkali metal salts thereof, where R2 is selected from the group consisting of alkyl groups comprising about 4 to 16 carbon atoms and alkylphenyl groups comprising 7 to about 22 carbon atoms.

Abstract: The present invention pertains to a method for manufacturing a hydrogen-silsesquioxane resin in which a solution of HSiCl3 in a halogenated hydrocarbon solvent which can dissolve the organic sulfonic acid described below and which does not react with sulfuric acid is added to a two-phase system comprising [a] an aqueous phase which contains sulfuric acid and an organic sulfonic acid which is not sulfonated by sulfuric acid and which is soluble in both water and the organic phase described below, and [b] an organic phase which contains the halogenated hydrocarbon solvent, and the resulting mixture is agitated. In this method, the ratio of the sulfuric acid relative to the combined weight of the water (including water of hydration in cases where the above sulfonic acid contains such water of hydration) and sulfuric acid is 80 to 96 wt %, and is present in the organic phase at the rate of 0.008 moles/L or greater.

Abstract: A method for hydrolyzing chlorosilanes having at least three chlorine atoms bonded to each silicon atom to form silicone resins. The method comprises adding at least one of hydridotrichlorosilane, tetrachlorosilane, or organotrichlorosilane to a two-phase mixture comprising a non-polar organic solvent, an aqueous phase comprising 0 to about 43 weight percent hydrochloric acid, and a surface active compound selected from the group consisting of alkylsulphonic acid hydrate, alkali metal salt of alkylsulphonic acid, arysulphonic acid hydrate, and alkali metal salt of arylsulphonic acid.

Abstract: A method of obtaining fine-grained, free-flowing powdered silicone resins is disclosed. The powdered silicone resins contain very low or no residual aromatic solvents or other volatile organic compounds. The method includes the steps of (1) preparing a solution of an MQ silicone resin dissolved in a volatile liquid organosilicon solvent, such as hexamethyldisiloxane, and (2) spray-drying the solution obtained in step (1) to produce the silicone resin powder.