Abstract: A curable silicone pre-elastomer composition is disclosed comprising ammonium carboxylate, which upon cure yields a silicone elastomer having improved heat age properties and suitability for high or low temperature sealing applications.

Abstract: The present invention relates to the use of a thin fluorosilicone elastomer coating as a cost effective solution to the oil weepage problem while retaining the sealing advantages of silicone rubber.

Abstract: A composition is provided for treating silica filler in-situ, comprising a silanol-terminated, vinyl-containing polydiorganosiloxane having the general formula: ##STR1## wherein R is a monovalent substituted or unsubstituted hydrocarbon radical; R.sup.1 is R or a halogenated alkyl radical; R.sup.2 is R or a halogenated alkyl radical; "a" is a number in the range of from about 1 to about 30; "b" is a number in the range of from 0 to about 50; and "c" is a number in the range of from 4 to about 30; the vinyl content of the polydiorganosiloxane being in the range of from about 1 to about 20% by weight and the silanol content being in the range of from about 0.1 to about 6% by weight. Preferably, R and R.sup.1 are methyl, R.sup.2 is methyl or 3,3,3-trifluoropropyl, and b is 0.

Abstract: The present invention relates to the use of a thin fluorosilicone elastomer coating as a cost effective solution to the oil weepage problem while retaining the sealing advantages of silicone rubber.

Abstract: The present invention relates to the use of a thin fluorosilicone elastomer coating as a cost effective solution to the oil weepage problem while retaining the sealing advantages of silicone rubber.

Abstract: A composition for in situ treating silica filler is provided, comprising a silanol-terminated, vinyl-containing polydiorganosiloxane which functions both as a processing aid and as a crosslinking agent in vulcanizable fluorosilicone and silicone elastomer compositions.

Abstract: Diorganopolysiloxane homo- and copolymers having a viscosity from 50 to 200,000,000 centipoise at 25.degree. C, are produced by (a) reacting a composition of (i) a first cyclic siloxane having 3 to 6 units alone or admixed with (ii) a second cyclic siloxane having 3 to 6 units, (i) being present in an amount of 30 to 100 mol % of the composition, at a temperature in the range of 90.degree. to 150.degree. C and in the presence of 5 to 500 parts per million, as alkali metal hydroxide of a catalyst comprising alkali metal hydroxide or a silanolate of an alkali metal hydroxide complexed with a low molecular weight polymer of ethylene oxide (polyethylene glycol) soluble in the cyclic siloxanes. Especially useful products of the process are homopolymers and copolymers including siloxane chain units of the formula R R.sup.1 SiO wherein R.sup.1 is alkyl, halogenated alkyl or cycloalkyl, and preferably, perfluoroalkyl, and R is the same as R.sup.1 and, in addition, vinyl or phenyl.