Showa Denko K.k.

Resonac Corporation

Yuki Otsuka

Masaru Fukasawa

Hidetoshi Okamoto

Naoki Minorikawa

Hajime Yukutake

Toshihiro Arai

Ikue Kobayashi

A hexagonal BN powder containing an aggregate of primary particles of hexagonal BN nitride and having an average primary particle diameter, a 50% volume cumulative particle diameter D, a BET specific surface area, and a bulk density within predetermined ranges. Further, for a peak A in the particle diameter range of 1.0 μm or more and less than 20.0 μm and a peak B in the particle diameter range of 20.0 μm or more and less than 200.0 μm in a particle size distribution curve, the ratios of the height of the peaks are within predetermined ranges when the hexagonal BN powder is treated under predetermined conditions. Also disclosed is a method for producing the hexagonal BN powder, a composition including the hexagonal BN powder and at least one of a resin and a rubber, and a heat dissipation material containing the composition.

Hexagonal boron nitride powder and method for producing the same, and composition and heat dissipation material using the same

A method for producing silicon-containing oxide-coated aluminum nitride particles including aluminum nitride particles and a silicon-containing oxide coating covering a surface of each of the aluminum nitride particles. The method includes a first step including mixing aluminum nitride particles and an organic silicone compound solution in which an organic silicone compound containing a specific structure is dissolved in a solvent to form a mixture and then heating the mixture to remove the solvent and to obtain aluminum nitride particles coated with the organic silicone compound; and a second step including heating the aluminum nitride particles coated with the organic silicone compound at a temperature of 300° C. or more and 1,000° C. or less.

Method for producing silicon-containing oxide-coated aluminum nitride particles and method for producing exoergic resin composition

An inorganic particle dispersion resin composition, containing: a resin; and inorganic particles, in which the inorganic particles include silica-covered aluminum nitride particles and alumina particles, and the silica-covered aluminum nitride particles include aluminum nitride particles and a silica film covering surfaces of the aluminum nitride particles. A total content of the inorganic particles is preferably in a range of greater than or equal to 60.0 volume % and less than or equal to 85.0 volume %.

Inorganic particle dispersion resin composition and manufacturing method of inorganic particle dispersion resin composition

A silicon-containing oxide-coated aluminum nitride particle including an aluminum nitride particle and a silicon-containing oxide coating covering the surface of the aluminum nitride particle. The content of carbon atoms is less than 1000 ppm by mass, and an Si/Al atom ratio of the surface as measured by AES analysis is 0.29 or more and 5.0 or less. In another aspect, the coverage of the silicon-containing oxide coating covering the surface of the aluminum nitride particle as measured by LEIS analysis is 15% or more and 100% or less.

Silicon-containing oxide-coated aluminum nitride particle and method of manufacturing the same

A hexagonal boron nitride powder having an average longer diameter (L) of primary particles in the hexagonal boron nitride powder of more than 10.0 &#x3bc;m and 30.0 &#x3bc;m or less, an average thickness (D) of the primary particles in the hexagonal boron nitride powder of 1.0 &#x3bc;m or more, a ratio of the average longer diameter (L) to the average thickness (D), [L/D], of 3.0 or more and 5.0 or less, and a content of primary particles having a ratio of a longer diameter (1) to a thickness (d), [l/d], of 3.0 or more and 5.0 or less of 25% or more, a method for producing the hexagonal boron nitride powder, and a resin composition and a resin sheet each containing the hexagonal boron nitride powder.

Hexagonal boron nitride powder, method for producing same, resin composition and resin sheet

A method of manufacturing a silicon-containing oxide-coated aluminum nitride particle; a method of manufacturing a heat dispersing resin composition containing the silicon-containing oxide-coated aluminum nitride particle; and the silicon-containing oxide-coated aluminum nitride particle. The method of manufacturing includes: a first step of covering the surface of the aluminum nitride particle with an organic silicone compound including a specific structure; and a second step of heating the aluminum nitride particle covered with the organic silicone compound at a temperature of 300&#xb0; C. or more and less than 1000&#xb0; C., wherein the content of carbon atoms in the silicon-containing oxide-coated aluminum nitride particle is less than 1000 ppm by mass.

An hBN powder containing an aggregate of primary particles of hBN, the hBN powder having a ratio of an average longer diameter (L) to an average thickness (d) of the primary particles, [L/d], of 10 to 25, a tap density of 0.80 g/cmor more, and a BET specific surface area of less than 5.0 m/g, in which a particle size distribution curve showing a frequency distribution based on volume of the hBN powder is a bimodal distribution curve having a first peak and a second peak in a range of a particle size of 500 &#x3bc;m or less and having a peak height ratio of a second peak height (H) to a first peak height (H), [(H)/(H)], of 0.90 or less, a method for producing the same, and a resin composition and a resin sheet each comprising the hBN powder.

Glass-coated aluminum nitride particles and a method for producing the same. The glass-coated aluminum nitride particles include aluminum nitride particles and a glass phase which covers at least a part of the surface of each aluminum nitride particle. The glass phase is a composition which contains at least a glass component; and the proportion of the composition containing a glass component is 0.2 parts by weight to 5.0 parts by weight with respect to 100 parts by weight of the aluminum nitride particles. The composition containing the glass component further contains boron nitride particle; and the aluminum nitride particles have a volume cumulative d50 of from 10 &#x3bc;m to 200 &#x3bc;m.

Glass-coated aluminum nitride particles, method for producing same, and heat dissipating resin composition containing same

A hexagonal boron nitride (hBN) powder containing an aggregate of primary particles of hBN, in which the powder has a primary particle size of less than 10 &#x3bc;m, a ratio of an average longer diameter (L) to an average thickness (d) of the primary particles, [L/d], of 5.0 or more and 20 or less, and a BET specific surface area of less than 10 m/g. The powder has one maximum peak in a range of a particle size of 45 &#x3bc;m or more and 150 &#x3bc;m or less in a particle size distribution curve of a hexagonal boron nitride powder classified to have a particle size of 45 &#x3bc;m or more and 106 &#x3bc;m or less, and has a decrease rate of the maximum peak of 10% or more and less than 40%.

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Yokohama, Japan

Yuki Otsuka