×

Fluorosilicone rubber composition

  • US 5,059,668 A
  • Filed: 09/10/1990
  • Issued: 10/22/1991
  • Est. Priority Date: 01/20/1986
  • Status: Expired due to Term
First Claim
Patent Images

1. A curable fluorine-substituted organopolysiloxane composition which comprises, in admixture(A) a polyorganosiloxane having a viscosity of at least 400 centipoise at 25°

  • C. and a molecular structure represented by the general formula;

    
    
    space="preserve" listing-type="equation">X.sup.1 --O--(--SiR.sub.2 --O--)n--(--SiRR.sub.f --O--).sub.m --X.sup.2,
    
    
    space="preserve" listing-type="equation">or
    
    
    space="preserve" listing-type="equation">[X.sup.1 --O--(--SiR.sub.2 --O--).sub.n --(--SiRR.sub.f --O--).sub.m --].sub.p SiR.sub.4.sbsb.-p'"'"' in which R is a monovalent hydrocarbon group selected from the class consisting of methyl, vinyl and phenyl groups, Rf is a fluorinated alkyl group having 3 to 10 carbon atoms, n is zero or a positive integer, m is a positive integer with the proviso that m;

    (m+n) is in the range from 0.005 to 1, p is 2, 3 or 4, X1 is a vinyl dimethyl siloxy-substituted silyl group represented by the general formula;

    
    
    space="preserve" listing-type="equation">Vi--SiMe.sub.2 --(--O--SiMe.sub.2 --).sub.r-- in which Vi is a vinyl group, Me is a methyl group and r is a positive integer in the range from 1 to 30, and X2 is a hydrogen atom or X1 ; and

    (B) a curing agent which is a combination of an organohydrogenpolysiloxane having at least three hydrogen atoms directly bonded to the silicon atoms in a molecule and a platinum catalyst.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×