Sakai Chemical Industry Co., Ltd.

Satoshi Komori

Hironobu Ogata

Hisao Koizumi

Yasuyuki Murakami

Harunobu Saito

Takumi Kawada

Satsuki Motoishi

An amorphous silica powder comprising boron atoms. The amorphous silica powder comprising boron atoms has an average particle size from 10 to 100 nm, as determined from 40 particles selected at random in a transmission electron micrograph. The amorphous silica powder comprising boron atoms has a decrement in a boron content of 10 mass % or less, when fired under the following conditions: 5 to 10 g of a dried product of the boron-containing amorphous silica powder is filled into an alumina crucible, heated in the atmosphere at 200° C./hour to 1000° C. to 1100° C., maintained as it is for 5 hours, and cooled to room temperature.

Boron-containing amorphous silica powder and method of producing same

An object of the present invention is to provide magnesium oxide particles that have a high heat conductivity and excellent properties as heat-dissipating filler, and can prevent problems such as soft errors in the memory. The magnesium oxide particles have a BET specific surface area of 0.1 to 17 m/g, and an &#x3b1; dose of 0.005 c/cm&#xb7;Hr or lower, the particles exhibiting a relation between an X-ray diffraction peak intensity y (cps) at a Bragg angle (2&#x3b8;) of 42.80&#xb0; to 43.00&#xb0; and the BET specific surface area x (m/g) as represented by the following inequality (1):960+33000&#x2003;&#x2003;(1).

Magnesium oxide particles, magnesium oxide particle production method, resin composition and molded body using such resin composition, and adhesive or grease

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Osaka, Japan

Satoshi Komori