Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1975-10-10
1977-06-28
Marquis, Melvyn I.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 465UA, 260 465G, 260 465H, 264328, C08L 8304
Patent
active
040325024
ABSTRACT:
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 dimethylsiloxane 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 pressures less than 352 kg./sq.cm. (5,000 psi) whereon 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.
REFERENCES:
patent: 3445420 (1969-05-01), Kookootsedes et al.
patent: 3697473 (1972-10-01), Polmanteer et al.
patent: 3933882 (1976-01-01), Lee et al.
Lee Chi-Long
Marko Ollie W.
Schulz Jay R.
Dow Corning Corporation
Grindahl George A.
Marquis Melvyn I.
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