General Electric Company

George P De Zuba

John S Razzano

Tyrone D Mitchell

Alfred H Smith, Jr

Abe Berger

Terry G Selin

Ned J Reo

A self-bonding room temperature vulcanizable silicone rubber composition comprising a silanol-terminated diorganopolysiloxane base polymer, a filler, a crosslinking agent selected from carboxyl functional silanes and hydrocarbonoxy functional silanes, a curing catalyst and as the self-bonding additive a silyl maleate or a silyl fumarate or a silyl succinate. In place of the foregoing silane self-bonding additives there may be utilized as a self-bonding additive, a maleate functional polysiloxane, a fumarate functional polysiloxane or a succinate functional polysiloxane.

Self-bonding room temperature vulcanizable silicone rubber compositions

There is provided process aids for heat cured silicone rubber compositions which are the reaction product of a cyclictrisiloxane, and water or an aliphatic alcohol found in the presence of a catalyst which may be selected from certain moderate to high strength organic acids, lithium hydroxide, ammonia, ammonium hydroxide and primary amines. The advantage of such a process aid is that it is considerably less expensive to produce in silicone manufacturing facilities than the more traditional process aids that have been used in the past.

Process aids for heat cured silicone rubber compositions

Self-bonding, heat-curable silicone rubber composition comprising (a) a diorganopolysiloxane polymer (b) a curing catalyst and (c) a compound of the formula, ##EQU1## where R.sup.6 is selected from alkyl radicals and hydrogen, Z is seleccted from COO, phenylene, CO, CONH and CON-R.sup.2, R.sup.2 is selected from monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, R.sup.5 is selected from unsaturated monovalent hydrocarbon radicals and unsaturated halogenated monovalent hydrocarbon radicals, G.sup.1 is selected from hydrogen, R.sup.2 radicals and R.sup.5 radicals. There may also be used in the above composition a process aid, a filler, and other ingredients commonly used in heat-curable silicone rubber compositions. In place of the maleate set forth above, and/or in addition to the maleate set forth above, there may be used a silylmaleate.

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Mechanicville, NY, United States of America

George P De Zuba