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Addition curing silicone compositions

  • US 4,340,709 A
  • Filed: 07/16/1980
  • Issued: 07/20/1982
  • Est. Priority Date: 07/16/1980
  • Status: Expired due to Term
First Claim
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1. An addition curing silicone composition with a low viscosity in the uncured state and a high physical strength in the cured state comprising (A) 100 parts by weight of a vinyl-containing diorganopolysiloxane having a viscosity varying from 100 to 200,000 centipoise at 25°

  • C., where the diorganovinylsiloxy content varies from 0.14 to 2.0 mole percent and the organo group is a monovalent hydrocarbon radical;

    (B) from 0.1 to 500 parts per million of a platinum catalyst;

    (C) from 0.1 to 25 parts by weight of a crosslinker selected from the class consisting of hydride resins having only terminal hydrogen atoms and linear hydride polysiloxanes wherein said linear hydride polysiloxane has hydrogen atoms only in the internal position of the siloxane chain, and (D) from 75 to 150 parts by weight of a linear hydride polysiloxane coupler having hydrogen atoms bonded only at the terminal silicone atoms in the siloxane chain wherein said coupler has a dimethyl hydrogen siloxy content of from 3.0 to 9.0 mole percent and the viscosity of the linear hydride coupler varies from 1 to 500 centipoise at 25°

    C.

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