Reactive Silicone Composition, Reactive Thermoplastic Article, Cured Product, And Optical Semiconductor Device

摘要

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.

主权项

1. A reactive silicone composition comprising:
(A) 100 parts by mass of an organopolysiloxane represented by the average unit formula:
(R13SiO1/2)a(R12SiO2/2)b(R1SiO3/2)c(SiO4/2)d(R2O1/2)e wherein R1 are the same or different and are phenyl groups, alkyl groups having from 1 to 6 carbons, or alkenyl groups having from 2 to 6 carbons, provided that from 55 to 80 mol % of all R1 are phenyl groups and from 10 to 20 mol % of all R1 are alkenyl groups; R2 is a hydrogen atom or alkyl group having from 1 to 6 carbons; and a, b, c, d, and e are numbers that respectively satisfy: 0≦a≦0.30, 0.10≦b≦0.70, 0.35≦c≦0.85, 0≦d≦0.20, 0≦e≦0.10, and a+b+c+d=1; (B) from 0 to 40 parts by mass of an organopolysiloxane represented by the general formula:
R33SiO(R32SiO)nSiR33 wherein R3 are the same or different and are phenyl groups, alkyl groups having from 1 to 6 carbon atoms, or alkenyl groups having from 2 to 6 carbon atoms, provided that from 30 to 70 mol % of all R3 are phenyl groups and at least one R3 is an alkenyl group; and n is an integer in a range from 10 to 100; (C) an organopolysiloxane represented by the general formula:
HR42SiO(R42SiO)mSiR42Hwherein R4 are the same or different and are phenyl groups or alkyl groups having from 1 to 6 carbon atoms, provided that from 15 to 100 mol % of all R4 are phenyl groups; and m is an integer in a range from 1 to 10,in an amount that provides from 0.5 to 2.5 moles of silicon atom-bonded hydrogen atoms in this component per 1 mol of total alkenyl groups in components (A) and (B); (D) a hydrosilylation reaction catalyst in an amount sufficient to promote a hydrosilylation reaction between the alkenyl groups in components (A) and (B) and the silicon atom-bonded hydrogen atoms in component (C); (E) a white pigment in an amount of at least 50 parts by mass per 100 parts by mass of the total amount of components (A) to (D); and (F) non-spherical silica, spherical silica or glass fibers in an amount of at least 50 parts by mass per 100 parts by mass of the total amount of components (A) to (D); the total content of components (E) and (F) being not more than 400 parts by mass per 100 parts by mass of the total amount of components (A) to (D).