Self-bonding silicone rubber compositions
First Claim
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1. A self-bonding silicone rubber composition comprising (A) 100 parts by weight of a base polymer of the formula, ##STR8## where R is selected from the class consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, and x is such that the viscosity of the base polymer varies from 100 to 200,000,000 centipoise at 25°
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(B) from 0.5 to 50 parts by weight of a hydride siloxane cross-linking agent;
(C) from 1 to 500 parts per million of platinum catalyst; and
(D) from 0.1 to 5 parts by weight of a self-bonding additive which is the partial hydrolysis product of a compound of the formula,
space="preserve" listing-type="equation">R.sub.a.sup.1 Si (OR.sup.3).sub.4-awherein R1 is an aliphatic unsaturated radical selected from the class consisting of alkenyl radicals and alkynyl radicals of 2 to 8 carbon atoms, R3 is selected from the class consisting of alkyl radicals and cycloalkyl radicals of 1 to 8 carbon atoms and is 1 and wherein the partial hydrolysis product is such that on the average 16 to 49 mole percent of the hydrocarbonoxy groups of said silane are hydrolyzed.
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Abstract
A self-bonding silicone rubber composition comprising a vinyl-terminated polysiloxane polymer, a hydride siloxane cross-linking agent, a platinum catalyst and as the self-bonding additive, the partial hydrolysis product of an aliphatically unsaturated hydrolyzable alkoxy silane.
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Citations
10 Claims
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1. A self-bonding silicone rubber composition comprising (A) 100 parts by weight of a base polymer of the formula, ##STR8## where R is selected from the class consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, and x is such that the viscosity of the base polymer varies from 100 to 200,000,000 centipoise at 25°
- C.;
(B) from 0.5 to 50 parts by weight of a hydride siloxane cross-linking agent;
(C) from 1 to 500 parts per million of platinum catalyst; and
(D) from 0.1 to 5 parts by weight of a self-bonding additive which is the partial hydrolysis product of a compound of the formula,
space="preserve" listing-type="equation">R.sub.a.sup.1 Si (OR.sup.3).sub.4-awherein R1 is an aliphatic unsaturated radical selected from the class consisting of alkenyl radicals and alkynyl radicals of 2 to 8 carbon atoms, R3 is selected from the class consisting of alkyl radicals and cycloalkyl radicals of 1 to 8 carbon atoms and is 1 and wherein the partial hydrolysis product is such that on the average 16 to 49 mole percent of the hydrocarbonoxy groups of said silane are hydrolyzed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification