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Silicone rubber compositions

  • US 5,548,006 A
  • Filed: 11/17/1994
  • Issued: 08/20/1996
  • Est. Priority Date: 11/18/1993
  • Status: Expired due to Fees
First Claim
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1. A silicone rubber composition comprising(A) an organopolysiloxane of the following avenge compositional formula (1):

  • 
    
    space="preserve" listing-type="equation">R.sup.1.sub.a SiO.sub.(4-n)/2 (

         1) wherein R1 is a substituted or unsubstituted monovalent hydrocarbon group, the R1 groups may be identical or different, and letter n is a positive number of 1.98 to 2.02, containing at least two aliphatic unsaturated groups in a molecule,(B) an organohydrogenpolysiloxane of the following average compositional formula (2);

    
    
    space="preserve" listing-type="equation">R.sup.2.sub.a H.sub.b SiO.sub.(4-a-b)/2 (

         2) wherein R2 is a substituted or unsubstituted monovalent hydrocarbon group, the R2 groups may be identical or different, letters a and b are in the range;

    0≦

    a<

    3 and 0.005≦

    b≦

    2, and 0.8≦

    a+b≦

    3.0, having at least two hydrogen atoms attached to silicon atoms in a molecule,(C) a platinum series catalyst, and(D) 0.005 to 1 part by weight of a control agent per 100 parts by weight of the organopolysiloxane (component A), wherein said control agent is selected from the group consisting of a triazine of the following general formula (3);

    ##STR6## wherein R3, R4, and R5 are independently selected from the group consisting of a peroxy group, monovalent hydrocarbon group, hydroxyl group and hydrogen atom, at least one of R3, R4 and R5 being a peroxy group, and a sulfide of the following general formula (4);

    
    
    space="preserve" listing-type="equation">R.sup.6 --(S).sub.m --R.sup.7 (

         4) wherein each of R6 and R7 is a monovalent hydrocarbon having at least 3 carbon atoms or a monovalent hydrocarbon group having an ester bond or R6 and R7 taken together may form a ring structure, and letter m is a positive number of 1 to 3.

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