Claims
- 1. A room temperature vulcanizable addition-curable composition, comprising by weight,
- (A) 100 parts of a vinyl-containing polydiorganosiloxane composition comprising:
- (i) about 50 to about 100 parts of an essentially cyclic-free vinyl containing polydiorganosiloxane having a viscosity of from about 100 to about 100,000 centipoise at 25.degree. C. and organo groups attached to silicon by carbon-silicon bonds, selected from the class consisting of alkyl radicals having 1 to 8 carbon atoms, phenyl radicals, fluoroalkyl radicals having 3 to 10 carbon atoms and mixtures thereof, where the essentially cyclic-free vinyl containing polydiorganosiloxane has a vinyl content of from about 0.02 to about 2.0 weight %, and
- (ii) from about 0 to about 50 parts of a solid, benzene-soluble vinyl-containing resin copolymer comprising,
- (R).sub.3 SiO.sub.1/2 units and SiO.sub.4/2 units,
- where R is a vinyl radical, or a monovalent hydrocarbon radical free of aliphatic unsaturation and containing no more than six carbon atoms, the ratio of (R).sub.3 SiO.sub.1/2 units to SiO.sub.4/2 units being from about 0.5:1 to about 1.5:1, and the resin having a vinyl content of from about 1.5 to about 3.5% by weight,
- (B) from about 1 to about 20 parts of a hydrogen-containing polysiloxane having an average unit formula,
- R.sup.1.sub.a H.sub.b SiO(.sub.4-a-b)/2,
- where R.sup.1 is a monovalent hydrocarbon radical, or halogenated monovalent hydrocarbon radical having from 1 to about 10 carbon atoms and free of aliphatic unsaturation, "a" has a value of from about 0 to about 3, "b" has a value of from about 0 to about 3, and the sum of "a"+"b" has a value of from 0 to 3,
- (C) a catalytic amount of a hydrosilylation catalyst,
- (D) an effective amount of a bis[trialkyloxysilylalkyleneoxy]pyridine adhesion promoter having the formula,
- [(R.sup.2 O).sub.3 S.sub.i R.sup.3 O].sub.2 C.sub.5 H.sub.3 N
- where R.sup.2 is a C.sub.(1-4) alkyl radical and R.sup.3 is a C.sub.(2-8) alkylene radical,
- (E) from about 0 to about 200 parts of an extending filler, and
- (F) from about 0 to about 50 parts of a reinforcing filler, and in the absence of (A) (ii), an amount effective for reinforcement.
- 2. A room temperature vulcanizable composition in accordance with claim 1, where the vinyl-containing polydiorganopolysiloxane is a vinyl-containing polydimethylsiloxane.
- 3. A room temperature vulcanizable composition in accordance with claim 1, where the solid, benzene-soluble vinyl-containing resin comprises a mixture of (CH.sub.3).sub.3 SiO.sub.1/2 units and Vi(CH.sub.3).sub.2 SiO.sub.1/2 units and SiO.sub.2 units.
- 4. A room temperature vulcanizable composition in accordance with claim 1, where the hydrosilylation catalyst is a platinum catalyst.
- 5. A room temperature vulcanizable composition in accordance with claim 1, where the adhesion promoter is 2,6-bis(trimethoxysilyltrimethyleneoxy)pyridine.
- 6. A room temperature vulcanizable composition in accordance with claim 1 having a reinforcing filler.
- 7. A room temperature vulcanizable composition in accordance with claim 1 having an extending filler.
- 8. A room temperature vulcanizable composition in accordance with claim 1 having a mixture of a reinforcing and an extending filler.
- 9. A room temperature vulcanizable composition in accordance with claim 1 employing an effective amount of an inhibitor in combination with the hydrosilylation catalyst.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation in part of application Ser. No. 08/165,625, filed Dec. 13, 1993, U.S. Pat. No. 5,380,788.
US Referenced Citations (5)
Continuation in Parts (1)
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Number |
Date |
Country |
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165625 |
Dec 1993 |
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