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Curable fluorosilicone rubber composition

  • US 4,742,101 A
  • Filed: 02/10/1987
  • Issued: 05/03/1988
  • Est. Priority Date: 02/14/1986
  • Status: Expired due to Term
First Claim
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1. A curable fluorosilicone rubber composition comprising:

  • (A) 100 parts by weight of an organopolysiloxane represented by General Unit Formula (I);

    ##STR8## wherein R comprises 25 to 50 mole % of a group represented by the formula;

    --CH2 CH2 Rf, where Rf represents a perfluoroalkyl group having 1 to 3 carbon atoms, and 75 to 50 mole % of a group selected from the group consisting of a methyl group, an ethyl group, a phenyl group and a vinyl group; and

    a is a number of 1.98 to 2.02;

    and having a viscosity of at least 1,000 cP at 25°

    C.;

    (B) 10 to 50 parts by weight of reinforcing silica powder having a specific surface area of at least 50 m2 /g;

    (C) 0 to 100 parts by weight of semi-reinforcing silica powder having an average particle diameter of not greater than 50 μ

    m;

    (D) 3 to 10 parts by weight of a fluid organopolysiloxane compound represented by General Formula (II);

    ##STR9## wherein some R'"'"' represent methyl groups and other R'"'"' represent phenyl groups;

    the ratio of the number of the methyl group to the number of the phenyl group in the molecular ranges between 70/30 and 25/75; and

    n is an integer of 0 to 5; and

    (E) a vulcanizing agent.

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