Claims
- 1. A one part heat curable organopolysiloxane compositions comprising by weight,
- (A) 100 parts of an alkynyl substituted organopolysiloxane having the formula, ##STR8## (B) 0.2 to 10 parts of a hydride siloxane crosslinker and, (C) an effective amount of a Group VIII metal catalyst, where R is a member selected from the class consisting of C.sub.(1-13) monovalent hydrocarbon radicals, C.sub.(1-13) monovalent hydrocarbon radicals substituted with radicals inert during equilibration or condensation, and (R.sup.1).sub.3 Si, R.sup.1 is selected from C.sub.(1-13) monovalent hydrocarbon radicals, R.sup.2 is a member selected from the class consisting of C.sub.(1-13) monovalent hydrocarbon radicals and C.sub.(1-13) monovalent hydrocarbon radicals substituted with radicals inert during equilibration and condensation, c is equal to 0.001 to 2.25, d is equal to 0 to 2.25 and the sum of c+d is equal to 1.8 to 2.25.
- 2. A heat curable composition in accordance with claim 1, where (A) is a phenylacetylene endstopped polydimethylsiloxane.
- 3. A heat curable composition in accordance with claim 1, where (A) is a trimethylsilylacetylene endstopped polydimethylsiloxane.
- 4. A heat curable composition in accordance with claim 1, where the hydride siloxane crosslinker is a copolymer of condensed dimethylsiloxy units and methyl hydrogen siloxy units having 0.8 weight % hydrogen.
- 5. A heat curable composition in accordance with claim 1, where the platinum catalyst is a vinyl siloxane platinum complex.
- 6. An alkynyl substituted organopolysiloxane having the formula, ##STR9## where R is a member selected from the class consisting of C.sub.(1-13) monovalent hydrocarbon radicals, C.sub.(1-13) monovalent hydrocarbon radicals substituted with radicals inert during equilibration and condensation, and (R.sup.1).sub.3 Si, R.sup.1 is selected from C.sub.(1-13) monovalent hydrocarbon radials, R.sup.2 is a member selected from the class consisting of C.sub.(1-13) monovalent hydrocarbon radicals and C.sub.(1-13) monovalent hydrocarbon radicals substituted with radicals inert during equilibration and condensation, c is equal to 0.001 to 2.25, d is equal to 0 to 2.25 and the sum of c+d is equal to 1.8 to 2.25.
- 7. An alkynyl substituted organopolysiloxane in accordance with claim 6, where R is phenyl or trimethylsilyl.
- 8. Hexakis(trimethylsilylacetylene)disiloxane.
- 9. A method for making alkynyl substituted organopolysiloxanes comprising effecting reaction between an acetylide substituted organometallic of the formula,
- RC.tbd.CQ,
- and a halo substituted organosiloxane of the formula, ##STR10## where R is a member selected from the class consisting of C.sub.(1-13) monovalent hydrocarbon radials, C.sub.(1-13) monovalent hydrocarbon radicals substituted with radicals inert during equilibration and condensation, and (R.sup.1).sub.3 Si, R.sup.1 is selected from C.sub.(1-13) monovalent hydrocarbon radicals, R.sup.2 is a member selected from the class consisting of C.sub.(1-13) monovalent hydrocarbon radicals and C.sub.(1-13) monovalent hydrocarbon radicals substituted with radicals inert during equilibration and condensation, Q is an alkali metal group selected from sodium, potassium or lithium, or an alkaline earth metal halide, X is a halogen radical, a is equal to 0.001 to 3, b is equal to 0 to 2, and the sum of a+b is equal to 1.8 to 3.
- 10. A method in accordance with claim 9, where the alkaline earth metal halide is magnesium bromide.
Parent Case Info
This application is a continuation of application Ser. No. 07/590,746, filed Oct. 1, 1990, which is now abandoned.
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Continuations (1)
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Number |
Date |
Country |
Parent |
590746 |
Oct 1990 |
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