Patent ID: 6353074
Filing Date: 2002-03-05
Classification: C08G

Abstract:
A method for making a hydrogen-silsesquioxane resin wherein trichlorosilane (HSiCl3) is subjected to a hydrolytic condensation reaction comprising the steps of:a. preparing an aqueous phase by dissolving an organic sulfonic acid selected from aromatic sulfonic acids or aliphatic sulfonic acids in aqueous sulfuric acid, wherein the sulfuric acid comprises 80 to 96 wt % of the total amount of sulfuric acid and water present in the aqueous phase; b. preparing a reaction medium wherein the reaction medium comprises the aqueous phase and an organic phase by adding the aqueous phase to a halogenated hydrocarbon solvent which is capable of dissolving the trichlorosilane, and which has no substantial reactivity with respect to sulfuric acid; c. adding trichlorosilane (HSiCl3) to the reaction medium while mixing the reaction medium; d. separating the organic phase containing the hydrogen-silsesquioxane resin and aqueous phase and e. removing the hydrogen-silsesquioxane resin from the organic phase.