Surface-modified zinc oxide particles, dispersion solution, and cosmetic
AssigneeSumitomo Osaka Cement Co., Ltd.
InventorsSyunsuke Suma, Masahiro Nobe
Life of this patent
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Abstract
Surface-modified zinc oxide particles having a silane coupling agent having an alkoxy group on surfaces thereof, in which the surface-modified zinc oxide particles have 5.0×10-2 g2/s or more and 1.0×102 g2/s or less of a penetration rate coefficient A of cyclopentasiloxane with respect to the surface-modified zinc oxide particles, which is indicated by A in the following formula (1). W2=A·t (1) (in the formula, W is a penetration weight (unit: g), and t is a time (unit: s).).
Claims12
Surface-modified zinc oxide particles, wherein the surface-modified zinc oxide particles have a silane coupling agent having an alkoxy group on surfaces thereof,
- the surface-modified zinc oxide particles are dried particles,
- the silane coupling agent is at least one selected from a group consisting of octyltriethoxysilane, octyltrimethoxysilane, and a dimethoxydiphenylsilane-triethoxycaprylylsilane crosspolymer,
- and
- a penetration rate coefficient A of cyclopentasiloxane with respect to the surface-modified zinc oxide particles, which is indicated by A in the following formula (1), is 5.0×10−2 g2/s or more and 1.0×102 g2/s or less,
- W2=A·t (1)
- (in the formula, W is a penetration weight (unit:
- g), and t is a time (unit:
- s).
Dependencies are inferred from the claim text.