Extrudable silicone elastomer compositions

C - Chemistry – Metallurgy – 08 – L

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400/4104

C08L 83/07 (2006.01) C08L 83/04 (2006.01)

Patent

CA 1200635

EXTRUDABLE SILICONE ELASTOMER COMPOSITIONS Abstract This invention provides organopolysiloxane elastomers exhibiting a desirable combination of high durometer hardness, tensile strength and tear strength, and a level of heat stability sufficient to retain these properties following prolonged exposure to temperatures above 150°C. The elastomers are prepared by curing a vinyl endblocked polydiorganosiloxane, an organopoly- siloxane resin having a specified concentration of vinyl groups, a treated silica filler containing vinylsiloxy groups bonded to the silica particles and an organo- hydrogenpolysiloxane in the presence of a suitable platinum catalyst.

421926

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