Composite particle, method of producing same, resin composition containing the particle, reflector formed from the composition, and light-emitting semiconductor device using the reflector

摘要

A composite oxide particle prepared from raw materials comprising: (1) a finely powdered silica having a BET specific surface area of 50 m2/g or greater or an alkoxysilane, and (2) a liquid metal alkoxide other than an alkoxysilane or a nano order metal oxide powder other than finely powdered silica, one of components (1) and (2) being a solid oxide and the other being a liquid alkoxide, wherein the composite oxide particle is prepared by mixing or kneading the raw materials to obtain a sol or gel-like substance, sintering the sol or gel-like substance at a temperature of 300° C. or higher to form a glass-like substance, and then crushing the glass-like substance is provided. Also, a resin composition containing the composite oxide particle, and a reflector for a light-emitting semiconductor device formed using the resin composition are provided. The invention is able to provide a resin composition which is ideal as a reflector material for a light-emitting semiconductor device that exhibits high light reflectance and minimal light transmission, and a composite oxide particle that is added to the resin composition.

主权项

1. A composite oxide particle prepared from raw materials comprising:
(1) at least one type of silicon-containing compound selected from among:
(1-1) finely powdered silica having a BET specific surface area of 50 m2/g or greater, and(1-2) alkoxysilanes represented by general formula (1):
R1aSi(OR2)4-a  (1)wherein each R1 independently represents an unsubstituted or substituted monovalent hydrocarbon group of 1 to 15 carbon atoms, each R2 independently represents an alkyl group of 1 to 6 carbon atoms, and a represents an integer of 0 to 3, and (2) at least one type of metal compound comprising a metal other than silicon, the metal compound being selected from among:
(2-1) liquid metal alkoxides other than alkoxysilanes, and(2-2) metal oxide powders with an average particle size within a range from 1 to 50 nm other than silica, one of components (1) and (2) being an oxide, and one other being an alkoxide, wherein the composite particle is prepared by mixing or kneading the raw material to obtain a sol or gel-like substance, subsequently sintering the sol or gel-like substance at a temperature of 300° C. or higher to form a glass-like substance, and then crushing the glass-like substance.