Low density silicone foam

  • US 4,767,794 A
  • Filed: 10/26/1987
  • Issued: 08/30/1988
  • Est. Priority Date: 10/26/1987
  • Status: Expired due to Fees
First Claim
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1. A foamable composition comprising:

  • (a) 100 parts by weight of a vinyl-containing polysiloxane of the formula;

    ##STR3## where R and R1 are selected from substituted or unsubstituted hydrocarbon radicals of from 1 to 20 carbon atoms, such that the polymer contains from 0.0002 to 3% by weight vinyl and x varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25°

    C.;

    (b) from 1 to 50 parts by weight of a hydride polysiloxane of the formula;

    ##STR4## where R2 is selected from the group consisting of independently, hydrogen, alkyl radicals of from 1 to 8 carbon atoms, aryl radicals of from 1 to 8 carbon atoms, haloalkyl radicals of 3 to 8 carbon atoms and simultaneously, a single --O-- to form a cyclic polymer and R3 is selected from the group consisting of alkyl radicals of from 1 to 8 carbon atoms, aryl radicals of from 1 to 8 carbon atoms, and fluoroalkyl radicals of 3 to 8 carbon atoms, where the hydride polysiloxane has a hydrogen content varying from 0.3 to 1.6% by weight and z and y vary such that the polymer has a viscosity varying from 1 to 500 centipoise at 25°

    C.;

    (c) a hydroxyl source selected from the group consisting of water, organic alcohol, hydroxylated siloxane, and combinations thereof in an amount to provide a molar ratio of from about 0.02/1 to about 5/1 of hydroxyl radicals to silicon-bonded hydrogen atoms of component (b);

    (d) from about 1 to about 250 parts per million of platinum catalyst; and

    (e) an amount of amine compound effective to lower foam density of the formula;

    
    
    space="preserve" listing-type="equation">NR.sub.3.sup.4 wherein R4 is selected from the group consisting of hydrogen, hydroxy, substituted or unsubstituted alkyl of 1 to 18 carbon atoms substituted or unsubstituted aryl of 1 to 18 carbon atoms, and a substituted or unsubstituted silyl.

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