Curable organosiloxane gel compositions

Details Curable organosiloxane gel compositions Curable organosiloxane gel compositions

1992-04-09

1993-08-24

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

525100, 525105, 525106, C08G 7706

Patent

active

052390357

ABSTRACT:
The amount of solvent-extractable materials present in organosiloxane gels cured by a platinum-catalyzed hydrosilylation reaction can be reduced without sacrificing other desirable properties the gels when the curable composition used to prepare the gel comprise a first polydiorganosiloxane with vinyl or other ethylenically unsaturated hydrocarbon radicals only at the terminal positions, a second polydiorganosiloxane with silicon bonded hydrogen atoms only at the terminal positions and a crosslinking reactant containing at least three alkenyl radicals or silicon-bonded hydrogen atoms per molecule. The number of silicon-bonded hydrogen atoms or alkenyl radicals in excess of 2 per molecule of crosslinking reactant constitute from 10 to 30 percent of these reactive groups present in the curable composition.

REFERENCES:
patent: 3020260 (1962-02-01), Nelson
patent: 4100627 (1978-07-01), Brill, III
patent: 4350709 (1982-07-01), Jeram et al.
patent: 4535141 (1985-08-01), Kroupa
patent: 4719275 (1988-01-01), Benditt et al.
patent: 5169727 (1992-12-01), Boardman

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