Method of preparing an organic-modified, heat-curable silicone resin and the resin produced thereby

摘要

A method for preparing an organic-modified, heat-curable silicone resin and the novel resin produced thereby are disclosed. In the method of the invention, a trialkoxysilane, a difunctional diorganosilicon compound, a polyol and a catalytic amount of an acidic cationic siloxane polymerization catalyst are reacted to substantial equilibrium to form an alkoxy-functional product. Substantially all the hydrolyzable alkoxy groups of the alkoxy-functional product are then hydrolyzed and the catalyst inactivated. The product is stripped of water and alcohol and may be diluted with a polar solvent such as xylene to the desired viscosity. The heat-cured resin product obtained in accordance with the invention has superior hardness, flexibility and solvent and impact resistance.