High strength, extrudable silicone elastomer compositions

Details High strength, extrudable silicone elastomer compositions High strength, extrudable silicone elastomer compositions

C - Chemistry, Metallurgy

08

K

400/4104

C08K 9/06 (2006.01) C08K 3/36 (2006.01) C08L 83/04 (2006.01)

Patent

CA 1134971

ABSTRACT OF THE DISCLOSURE A composition curable to a silicone elastomer is prepared by mixing a triorganosiloxy endblocked polydimethylsiloxane fluid where the triorganosiloxy is dimethylvinylsiloxy or methylphenyl- vinylsiloxy, a reinforcing silica having a surface treated with organosiloxane groups which contain 0.05 to 0.32 percent by weight vinyl, a fluid organohydrogensiloxane, a platinum catalyst and optionally a platinum catalyst inhibitor. The polydimethyl- siloxane fluid has a major peak molecular weight of 68,000 to 135,000, a dispersity index greater than 3.8, the lowest molecular weight species between 854 and 3146 and the highest molecular weight species between 174,000 and 370,000. These compositions are readily extrudable under low pressure and cure to high strength elastomers with a high durometer. These compositions furthermore exhibit the novel combination of 1) liquid materials which can be injection molded under conventional processing con- ditions and 2) levels of hardness, tensile strength and tear strength that can not be achieved using compositions taught by the prior art.

321355

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