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US 3,944,519 AGranted
Curable organopolysiloxane compositions
AssigneeDow Corning Corporation
InventorsAlan E. Mink, Darrell D. Mitchell
Life of this patent
Estimating the term…
Abstract
Platinum-catalyzed mixtures of H(CH.sub.3).sub.2 SiO--(C.sub.6 H.sub.5).sub.2 SiOSi(CH).sub.2 H and monophenylsiloxy/dimethylvinylsiloxy copolymer cure to give a strong flexible resin having thermal shock resistance.
Claims5
A curable composition consisting essentially of a mixture of
- a. an organopolysiloxane containing from 75 to 85 mol percent C.sub.6 H.sub.5 SiO.sub.3/2 units and 15 to 25 mol percent CH.sub.2 =CH(CH.sub.3).sub.2 SiO.sub.1/2 units, said organopolysiloxane having an average of at least 8 silicon atoms per molecule;
- b. an organopolysiloxane of the formula ##EQU4## said organopolysiloxane being present in the mixture in an amount sufficient to provide about 0.9 to 1.1 mol of .tbd.SiH per mol of vinyl substituent present in siloxane (a);
- c. a platinum catalyst present in an amount sufficient to catalyze the addition reaction of .tbd.SiH with CH.sub.2 =CHSi.tbd..
Dependencies are inferred from the claim text.