General Electric Company

Richard P Surprenant

Melvin D Beers

Robert A Smith

A titanium chelate catalyst for a room temperature vulcanizable silicone rubber composition which does not form nodules upon storage where the catalyst has the formula, ##STR1## where s varies from 0.7 to 1.3 and t varies from 0.7 to 1.3. Preferably s varies from 0.8 to 1.2 and t varies from 0.8 to 1.2.

Titanium chelate catalyst for silicone compositions

The adhesion of self-bonding, low modulus, one package, room temperature vulcanizable silicone compositions to a variety of substrates is effectively promoted by incorporating in the silicone composition, before curing, a small effective amount of an adhesion promoting composition comprising predominantly at least one diorganocyclopolysiloxane compound of the formula: ##STR1## wherein R.sup.1 may be C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 gamma-trihaloalkyl or phenyl; R.sup.2 is alkylene of from 2 to 6 carbon atoms; R.sup.3, R.sup.4 and R.sup.5 are, independently, C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkanoyl; and n is either 3 or 4.

Composition for promoting adhesion of curable silicones to substrates

The adhesion of self-bonding, low modulus, one package, room temperature vulcanizable silicone compositions to a variety of substrates is effectively promoted by incorporation in the silicone composition, before curing, a small effective amount of an adhesion promoting composition comprising predominantly at least one diorganocyclopolysiloxane compound of the formula: ##STR1## wherein R.sup.1 may be C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 gamma-trihaloalkyl or phenyl; R.sup.2 is alkylene of from 2 to 6 carbon atoms; R.sup.3, R.sup.4 and R.sup.5 are, independently, C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkanoyl; and n is either 3 or 4.

A titanium chelate catalyst for a room temperature vulcanizable silicone rubber compositions which does not form nodules upon storage where the catalyst has the formula, ##STR1## where s varies from 0.7 to 1.3 and t varies from 0.7 to 1.3. Preferably s varies from 0.8 to 1.2 and t varies from 0.8 to 1.2.

A process and composition for producing a cross-linking agent component for two-component room temperature vulcanizable silicone rubber compositions comprising the reaction product of 25 to 75 parts of a silicate selected from the class consisting of alkyl silicates of the formula,

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Troy, NY, United States of America

Richard P Surprenant