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Polymer composition and method of using same to produce thermostable insulating materials

  • US 4,151,158 A
  • Filed: 01/17/1977
  • Issued: 04/24/1979
  • Est. Priority Date: 01/17/1977
  • Status: Expired due to Term
First Claim
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1. A polymer composition comprising 8 to 20 parts by weight of polyborsiloxane having a molecular weight of 2,000 to 5,000 and containing structural units [BoSi] [(CH3)2 SiO] with a B:

  • Si molar ratio of 1;

    4 to 5, 40 to 90 parts by weight of polysiloxane rubber, 10 to 60 parts by weight of an organic polymer selected from the group consisting of polyolefine, copolymers of olefins and dienes, halogenated polyolefins and halogenated copolymers of olefins and dienes, 2 to 10 parts by weight of branched polyorganosiloxane having a molecular weight of 2,000 to 5,000 of the general formula;

    ##STR6## wherein;

    R is a radical selected from the group of radicals composed of CH3, C6 H5 ;

    a=43 to 50 mole %, b=0 to 2 mole %, c=50 to 55 mole %, 10 to 25 parts by weight of silicon dioxide, and 5 to 10 parts by weight of a variable valency metal oxide.

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