Claims
- 1. An addition-curable composition consisting essentially of, by weight:
- (A) 100 parts of a vinyl-containing polydiorganosiloxane composition comprising:
- (1) about 50-100 parts of an essentially cyclic-free vinyl-terminated polydiorganosiloxane having the general formula,
- R.sub.2 ViSiO(R.sub.2 SiO).sub.m (RViSiO).sub.n SiR.sub.2 Vi,
- where Vi is a vinyl radical; R is 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 and the value of m+n is sufficient to provide a viscosity of 100-100,000 centipoise at 25.degree. C. and a vinyl content of about 0.02-2.0& by weight; and
- (2) about 0-50 parts of a solid, benzene-soluble vinyl-containing resin copolymer comprising (R.sup.1).sub.3 SiO.sub.1/2 units and SiO.sub.4/2 units, where R.sup.1 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.sup.1).sub.3 SiO.sub.1/2 units to SiO.sub.4/2 units being about 0.5-1.5:1; said copolymer having a vinyl content of about 1.5-3.5% by weight;
- (B) about 1-20 parts of a hydrogen-containing polysiloxane having an average unit formula,
- (R.sup.2).sub.a H.sub.b SiO.sub.(4-a-b)/2,
- where R.sup.2 is a monovalent hydrocarbon radical or halogenated monovalent hydrocarbon radical having about 1-10 carbon atoms and free of aliphatic unsaturation, a has a value of about 0-3, b has a value of about 0-3 and a+b has a value of 0-3;
- (C) a catalytic amount of a hydrosilylation catalyst,
- (D) 0.6-2.0 parts, per 100 parts of said addition-curable composition, of a bis(trialkyloxysilyl)alpha-amino ester having the formula
- (R.sup.3 O).sub.3 SiR.sup.4 OC(O)CH.sub.2 N(H)R.sup.5 Si(OR.sup.3).sub.3,
- where R.sup.3 is selected from the same or different C.sub.1-4 alkyl radicals and R.sup.4 and R.sup.5 are selected from the same or different C.sub.2-8 alkylene radicals;
- (E) about 0-200 parts of an extending filler and
- (F) about 0-50 parts of a reinforcing filler, and in the absence of (A)(2), an amount thereof effective for reinforcement.
- 2. An addition-curable composition in accordance with claim 1, where the vinyl-containing polydiorganopolysiloxane is a vinyl-containing polydimethylsiloxane.
- 3. An addition-curable 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. An addition-curable composition in accordance with claim 1, where the hydrosilylation catalyst is a platinum catalyst.
- 5. An addition-curable composition in accordance with claim 1, where (CH.sub.3 O).sub.3 SiCH.sub.2 CH.sub.2 CH.sub.2 N(H)CH.sub.2 C(O)OCH.sub.2 CH.sub.2 CH.sub.2 Si(OCH.sub.3).sub.3 is the adhesion promoter.
Parent Case Info
This application is a continuation of application Ser. No. 08/169,271 filed Dec. 20, 1993, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
5164461 |
Mitchell et al. |
Nov 1992 |
|
5173529 |
Fujiki et al. |
Dec 1992 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
169271 |
Dec 1993 |
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