High strength, extrudable silicone elastomer compositions

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

1978-05-08

1979-07-24

Jacobs, Lewis T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

528 31, C08L 8304

Patent

active

041622430

ABSTRACT:
A composition curable to a silicone elastomer is prepared by mixing a triorganosiloxy endblocked polydimethylsiloxane fluid where the triorganosiloxy is dimethylvinylsiloxy or methylphenylvinylsiloxy, a reinforcing silica having a surface treated 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 polydimethylsiloxane 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.

REFERENCES:
patent: 3122516 (1964-02-01), Polmanteer
patent: 3671480 (1972-06-01), Wada et al.
patent: 3697473 (1972-10-01), Polmanteer et al.
patent: 3884866 (1975-05-01), Jeram et al.
patent: 4032502 (1977-06-01), Lee et al.

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