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AssigneeNippon Steel Chemical & Material Co., Ltd.
InventorsMasanori AE, Mutsuhito TANAKA, Asahi MATSUKI, Jinya KATOU, Ryutaro NUMAO
Estimating the term…
Spherical alumina particles able to improve the thermal conductivity of resin compositions formed when kneaded with a resin and able to keep down the viscosity (raising the fluidity) and a method of production of the same, i.e., spherical alumina particles having a D50 by a laser diffraction/scattering method of 0.5 or more and 10.0 μm or less, a particle size distribution, measured by a wet sieving test method, in which 20.0 μm or more particles account for 0.04 wt % or less, a specific surface area, measured by a BET method, of 0.35 m2/g or more and 3.50 m2/g or less, a “tapped bulk density”, prescribed by Japan Industrial Standard JISR1628: 1997, of 1.30 g/cm3 or more and 2.50 g/cm3 or less, and a roundness of 0.90 or more and a method of production of the same.
Spherical alumina particles having
A method of production of spherical alumina particles having a D50 by a laser diffraction/scattering method of 0.5 or more and 10.0 μm or less, a particle size distribution, measured by a wet sieving test method, in which 20.0 μm or more particles account for 0.04 wt % or less, a specific surface area, measured by a BET method, of 0.35 m2/g or more and 3.50 m2/g or less, a “tapped bulk density”, prescribed by Japan Industrial Standard JISR1628:1997, of 1.30 g/cm3 or more and 2.50 g/cm3 or less, and a roundness of 0.90 or more characterized by having a step of running at least one of alumina, boehmite, or aluminum hydroxide through a flame to make it melt, then cooling it to thereby make it spheroidal and a step of classification jointly using a precision wind classifier and sieve after the spheroidization step.
Dependencies are inferred from the claim text.