Method of preparing an organically-modified, heat-curable silico

Details Method of preparing an organically-modified, heat-curable silico Method of preparing an organically-modified, heat-curable silico

1994-04-29

1995-06-20

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 29, 428447, 524588, 524858, C08G 7708

Patent

active

054261686

ABSTRACT:
A novel method for preparing an organically-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.

REFERENCES:
patent: 2441066 (1948-05-01), Hanford
patent: 3600418 (1971-08-01), Bailey et al.
patent: 4408031 (1983-10-01), Holtschmidt et al.
patent: 4501872 (1985-02-01), Chang et al.
patent: 4749764 (1988-06-01), Koerner et al.
Kendrick et al., Polymerization of Siloxanes, (1989) pp. 479-480.
Letter from Goldschmidt Chemical to Dow Corning, Feb. 23, 1990.
Silikophen P80/X (label).

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