Method of preparing an organic-modified, heat-curable...

Details Method of preparing an organic-modified, heat-curable... Method of preparing an organic-modified, heat-curable...

C - Chemistry, Metallurgy

08

G

C08G 77/08 (2006.01) C08G 77/50 (2006.01) C09D 183/04 (2006.01) C09D 183/14 (2006.01)

Patent

CA 2147453

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 trialkoxy- silane, 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.

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