Tokuyama Corporation

Toru Iwata

Tadaharu Komatsubara

Yohei Chikashige

Provided is a novel spherical polymethylsilsesquioxane particle having an unprecedentedly large specific surface area ratio. The spherical polymethylsilsesquioxane particle includes a particle main body containing at least: a network structure formed by silicon atoms (n) and oxygen atoms (n) bonded to the silicon atoms (n); a methyl group bonded to at least one of the silicon atoms (n); and an alkoxyl group bonded to at least one of the silicon atoms (n), wherein the spherical polymethylsilsesquioxane particle satisfies the following expression (1): Expression (1) S/S≥8.0, in the expression (1), Srepresents a specific surface area (m/g) measured by a nitrogen adsorption BET one-point method, Srepresents 6/(ρ×D50) and a unit thereof is (m/g), ρ represents a particle density (g/m), and D50 represents a volume-based 50% cumulative diameter (m) measured by a laser diffraction/scattering method.

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Shunan, Japan

Toru Iwata