Organosiloxane compositions for liquid injection molding

Details Organosiloxane compositions for liquid injection molding Organosiloxane compositions for liquid injection molding

C - Chemistry, Metallurgy

08

G

400/5328, 18/714

C08G 77/04 (2006.01) C08L 83/04 (2006.01) C08L 83/08 (2006.01)

Patent

CA 1043929

Abstract or the Disclosure Organopolysiloxane compositions suitable for use in a liquid injection molding process of elastomeric articles are produced by mixing a vinyl-endblocked polydiorganosiloxane fluid copolymer containing dimethyl- siloxane units and methyl-3,3,3-trifluoropropylsiloxane units a treated, reinforcing silica filler, a platinum- containing catalyst, a curing agent comprising dimethylhydrogensiloxane units as the only source of silicon-bonded hydrogen atoms and, as an inhibitor for the platinum-containing catalyst, certain olefinic siloxanes and/or acetylenic siloxanes. These compositions are especially suited for liquid injection molding because they can be stored at room temperature for days and can be injected into a hot mold with pressure less than 352 kg./sq.cm. (5,000 psi) whereupon they cure rapidly to an elastomeric article having a tensile strength greater than 42 kg./sq.cm., and elongation at break greater than 300 percent and a tear strength greater than 7 kg./cm.

254792

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