Importance

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Abstract

The present invention relates to a reactive silicone composition comprising: (A) an alkenyl group-containing organopolysiloxane represented by the average unit formula; (B) an alkenyl group-containing organopolysiloxane represented by the general formula; (C) a silicon atom-bonded hydrogen atom-containing organopolysiloxane represented by the general formula; (D) a hydrosilylation reaction catalyst; (E) a white pigment; and (F) non-spherical silica, spherical silica or glass fibers, a reactive thermoplastic article obtained by the composition to reaction under specified conditions, a cured product obtained by heating the article, and an optical semiconductor device having the cured product. The reactive silicone composition is a solid at an ordinary temperature and gives a reactive thermoplastic article that is fluidized at elevated temperatures. The reactive thermoplastic article is once fluidized upon heating and then gives a cured product. The cured product exhibits little reduction in mechanical strength or discoloration caused by heat or light and has high light reflectance. And the optical semiconductor device exhibits high luminous efficiency and causes little thermal degradation or photodegradation of a light reflection material.

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First Claim