Method for the preparation of an integral rubber article having

Details Method for the preparation of an integral rubber article having Method for the preparation of an integral rubber article having

1989-06-15

1991-10-01

Barr, Josephine

Compositions

Electrically conductive or emissive compositions

Elemental carbon containing

525477, 525478, 528503, H01B 106

Patent

active

050531670

ABSTRACT:
A method is disclosed for the preparation of an integral silicone rubber article having an electrically insulating part and an electrically conductive part, in which the adhesive bonding between the two parts is greatly enhanced and each part exhibits a remarkably small permanent compression set. The method comprises the steps of preparing a first cured silicone rubber body from a first silicone rubber composition and then curing a second silicone rubber body in contact with the first cured silicone rubber body under specified conditions while either one of the first and the second silicone rubber composition contains a substantial amount of a carbon black to give conductivity. Both of the two compositions comprises a non-acyl type organic peroxide, e.g., dicumyl peroxide, as a curing agent of the organopolysiloxane. Characteristically, either one or both of the two composition, of which the organopolysiloxane has at least two silicon-bonded vinyl groups in a molecule, comprise, in addition to the above mentioned organic peroxide, a combination of an organohydrogenpolysiloxane and a platinum catalyst so that the composition or compositions are curable in two ways of, one, the peroxide-induced crosslinking and, the other, the platinum-catalyzed addition reaction between the silicon-bonded vinyl groups and silicon-bonded hydrogen atoms.

REFERENCES:
patent: 4820446 (1989-04-01), Prud'Homme
patent: 4822523 (1989-04-01), Prud'Homme
patent: 4898689 (1990-02-01), Hamada et al.

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