Silicone rubber compositions
First Claim
1. A silicone rubber composition comprising(A) 100 parts by weight of an organopolysiloxane of the following compositional formula:
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space="preserve" listing-type="equation">R.sub.n.sup.1 SiO.sub.(4-n)/2 (
1)wherein R1 is independently selected from monovalent substituted or unsubstituted hydrocarbon groups and letter n is a positive number in the range of from 1.98 to 2.02, having at least two aliphatic unsaturated groups in a molecule,(B) about 5 to about 70 parts by weight of reinforcing silica powder having a specific surface area of at least 50 m2 /g,(C) about 5 to about 200 parts by weight of silicone elastomer particles obtained by reacting an organohydrogenpolysiloxane with a vinyl group-containing organopolysiloxane such that the molar ratio of .tbd.SiH group to --CH═
CH2 group ranges from 1.2 to 5, and(D) a platinum series catalyst optionally in admixture with an organic peroxide catalyst.
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Abstract
A rubber compound comprising (A) an organopolysiloxane having at least two alkenyl groups in a molecule and (B) reinforcing silica powder is blended with (C) silicone elastomer particles obtained by reacting an organohydrogenpolysiloxane with a vinyl group-containing organopolysiloxane such that the molar ratio of .tbd.SiH group to --CH═CH2 group ranges from 1.2 to 5 and (D) a platinum catalyst to form a silicone rubber composition which cures into a product having high rubber strength despite the inclusion of silicone elastomer particles. The composition finds typical use as silicone rubber parts in copying machines.
40 Citations
16 Claims
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1. A silicone rubber composition comprising
(A) 100 parts by weight of an organopolysiloxane of the following compositional formula: -
space="preserve" listing-type="equation">R.sub.n.sup.1 SiO.sub.(4-n)/2 (
1)wherein R1 is independently selected from monovalent substituted or unsubstituted hydrocarbon groups and letter n is a positive number in the range of from 1.98 to 2.02, having at least two aliphatic unsaturated groups in a molecule, (B) about 5 to about 70 parts by weight of reinforcing silica powder having a specific surface area of at least 50 m2 /g, (C) about 5 to about 200 parts by weight of silicone elastomer particles obtained by reacting an organohydrogenpolysiloxane with a vinyl group-containing organopolysiloxane such that the molar ratio of .tbd.SiH group to --CH═
CH2 group ranges from 1.2 to 5, and(D) a platinum series catalyst optionally in admixture with an organic peroxide catalyst. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification