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Curable silicone composition and cured product thereof

  • US 5,276,087 A
  • Filed: 01/23/1992
  • Issued: 01/04/1994
  • Est. Priority Date: 01/24/1991
  • Status: Expired due to Term
First Claim
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1. A curable silicone composition comprising:

  • (A) an alkenyl-containing organopolysiloxane which contains an average of 0.5 or more alkenyl groups in its molecule,(B) an organohydrogenpolysiloxane containing at least two silicon-bonded hydrogen atoms in its molecule,(C) a platinum group metal catalyst, and(D) a corrosion resistant effective amount of aluminum oxide powder consisting of substantially spherical particles with an average particle diameter of 50 μ

    m or below and an elongation of from 1.0 to 1.4 and being such that the respective amounts of alkali metal ions and halogen ions which are extracted with 50 ml of water from 5 g of the powder at 121°

    C. for 20 hours is not more than 10 ppm, wherein the amount of the component (D) is from 25 to 90% by weight based on the composition, and the ratio of the amount of hydrosilyl groups contained in the components (A) and (B) to the amount of alkenyl groups contained in the components (A) and (B) is in the range from 0.5/1 to 1.5/1.

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