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Curable fluorosilicone rubber composition

  • US 5,236,997 A
  • Filed: 02/18/1992
  • Issued: 08/17/1993
  • Est. Priority Date: 02/18/1991
  • Status: Expired due to Fees
First Claim
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1. A curable fluorosilicone rubber composition which is a uniform blend comprising:

  • (a) 100 parts by weight of a fluorine-substituted organopolysiloxane represented by the general formula
    
    
    space="preserve" listing-type="equation">X--[--(--SiR.sub.f R--O--).sub.m --(--SiR.sub.2 --O--).sub.n-1 --SiR.sup.1 R--]--X, in which R is a monovalent hydrocarbon group having 1 to 8 carbon atoms, Rf is a fluorine-substituted alkyl group or a fluorine-substituted alkyl group having one or more of etheric oxygen atoms --O-- or amide linkages --CONH-- between carbon atoms, R1 is R or Rf, X is a group represented by the general formula
    
    
    space="preserve" listing-type="equation">--Q--(--SiMe.sub.2 --O--).sub.a-1 --SiR.sup.2.sub.2 --OH Me being a methyl group, Q being a divalent group of the formula --O--Si(CH3)2 --O-- or a divalent hydrocarbon group having 2 to 10 carbon atoms, R2 being an atom or group selected from the class consisting of a hydrogen atom, a hydroxy group, a methyl group and a vinyl group and the subscript a being an integer of 1 to 20, and the subscripts m and n are each a positive integer with the proviso that m+n is in the range from 10 to 3000;

    (b) from 0.5 to 20 parts by weight of an organosilicon compound having, in a molecule, at least three hydrolyzable groups bonded to the silicon atom or atoms;

    (c) up to 500 parts by weight of an inorganic filler; and

    (d) a curing catalyst in an amount sufficient to cure the composition into an elastomeric form.

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