Shin-etsu Chemical Co., Ltd.

Satoshi Onai

Akira Yamamoto

Tohru Kubota

Masayuki Ikeno

Koji Sakuta

Eiichi Tabei

Mitsuhiro Iwata

Yasufumi Kubota

Yukito Kobayashi

The invention provides a curable resin composition which comprising: 100 parts by mass of a main component (X) (a refractive index: RI) containing at least one of a silicone resin, a modified silicone resin, an epoxy resin and a modified epoxy resin, and exceeding 0 part by mass and 100 parts by mass or less of an additive (Y) (a refractive index: RI) containing at least one of a silicone resin, a modified silicone resin, an epoxy resin and a modified epoxy resin, and having a different refractive index as that of the main component (X) being added and dispersed therein, wherein the difference of the refractive indexes of the main component (X) and the additive (Y) being |RI&#x2212;RI|&#x2267;0.0050 in an uncured state.

Curable resin composition, cured product thereof and photosemiconductor apparatus

The present invention is curable silicone resin composition which is an addition-curable silicone composition, and comprises:  Thereby, there can be provided a curable silicone resin composition having high light extraction efficiency and useful as, for example, an encapsulant, a cured product thereof and a photosemiconductor apparatus.

Curable silicone resin composition, cured product thereof and photosemiconductor apparatus

A curable resin composition to which at least phosphor particles and nanoparticles having a primary particle size of 1 nm or more and less than 100 nm are added, wherein the nanoparticles are dispersed in the form of secondarily aggregated particles having an average particle size of 100 nm or more and 20 &#x3bc;m or less in terms of volume Q3 is provided for an optical semiconductor apparatus in which when a sealant obtained by dispersing phosphor particles in a curable resin composition having a low viscosity is filled into a package substrate, the dispersion state of the phosphor particles is not changed at the early and late stages of the fabrication, specifically the amounts of the phosphor particles to be contained at the early and late stages are the same, and the color rendering property can be stably maintained, a hardened material thereof, and an optical semiconductor apparatus.

Curable resin composition, hardened material thereof, and optical semiconductor apparatus

A branched tetrasiloxane is prepared by preforming a liquid mixture of a disiloxane compound, an alcohol and an acid catalyst, adding a trialkoxysilane compound to the mixture for reaction, and adding water to the reaction mixture for co-hydrolysis, thereby forming a branched tetrasiloxane. The method is capable of preparing a branched tetrasiloxane, especially methyltris(trimethylsiloxy)silane having a sufficiently high purity to use as cosmetic oil in good yields.

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Takasaki, Japan

Satoshi Onai