Sumitomo Osaka Cement Co., Ltd.

Syunsuke Suma

Tetsuro Itagaki

Gaku Fujihashi

Tadashi Neya

Kenichiro Nishida

Hirokazu Matsushita

Shingo Hosoda

Masahiro Nobe

Yoshiki Kusahara

Zinc oxide powder of the present invention contains zinc oxide particles, in which primary particles of the zinc oxide particles have a minor axis of 35 nm or more and 350 nm or less and have a Heywood diameter of 35 nm or more and 400 nm or less, and a coefficient of variation of a number distribution of the Heywood diameters of the primary particles of the zinc oxide powder is 50% or less.

Zinc oxide powder, dispersion, composition, and cosmetic

In a zinc oxide powder of the present invention, a content of a water-soluble substance is 0.30% by mass or less, and a mass ratio between an alkali metal and an alkaline earth metal which are included in the water-soluble substance is in a range of 1:2 to 10:1.

Zinc oxide powder, dispersion, and cosmetics

A zinc oxide powder in which a BET specific surface area (X) of the powder is 1.5 m/g or more and 65 m/g or less, a value obtained by a formula: an apparent specific volume (mL/g) measured by a loose packing method of the zinc oxide powder/an apparent specific volume (mL/g) measured by a tapping method of the zinc oxide powder is 1.5 or more and 2.5 or less, and Formula (1) and Formula (2) shown below are satisfied.1/2=+0.06&#x2003;&#x2003;(1)(2&#x2212;1)/2&#x2265;0.02&#x2003;&#x2003;(2)

Zinc oxide powder, dispersion, paint, and cosmetic

A zinc oxide powder in which a BET specific surface area of the powder is 8 m/g or more and 65 m/g or less, an apparent specific volume measured by a loose packing method of the powder is 1.0 mL/g or more and 7.5 mL/g or less, and a value indicated by (the apparent specific volume measured by the loose packing method/an apparent specific volume measured by a tapping method), which is obtained by dividing the apparent specific volume (mL/g) measured by the loose packing method by the apparent specific volume (mL/g) measured by the tapping method of the powder, is 1.50 or more and 2.50 or less.

Zinc oxide coated with silicon oxide of the present invention is zinc oxide which is coated with silicon oxide wherein surfaces of zinc oxide particles are coated with silicon oxide coatings, and the coated zinc oxide particles comprises at least one element selected from a group consisting of Mg, Ca, and Ba.

Zinc oxide which is coated with silicon oxide, method for manufacturing the same, composition which includes the zinc oxide coated with silicon oxide, and cosmetic

Provided are a silicon oxide-coated zinc oxide, a method for producing the same, a composition and a cosmetic including a silicon oxide-coated zinc oxide. The silicon oxide-coated zinc oxide is a silicon oxide-coated zinc oxide formed by coating surfaces of zinc oxide particles with a silicon oxide coat, in which an average particle diameter of the zinc oxide particles is in a range of more than 50 nm and 500 nm or less, and, when an abundance ratio of silicon in the silicon oxide coat in a Qenvironment is indicated by Q, and an abundance ratio in a Qenvironment is indicated by Q, Q+Q&#x2265;0.6 and Q/(Q+Q)&#x2265;0.5 are satisfied.

Silicon oxide-coated zinc oxide, method for producing same, and composition and cosmetic including silicon oxide-coated zinc oxide

Provided are a silicon-oxide-coated zinc oxide capable of suppressing the elution of zinc ions from zinc oxide particles, a method for manufacturing the same, a silicon-oxide-coated-zinc-oxide-containing composition, and a cosmetic. The silicon-oxide-coated zinc oxide is a silicon-oxide-coated zinc oxide formed by coating the surfaces of zinc oxide particles with a silicon oxide coating, in which the average particle diameter of the zinc oxide particles is in a range of 1 nm or more and 50 nm or less, when the abundance ratio of silicon in the silicon oxide coating in a Qenvironment is indicated by Q, and the abundance ratio in a Qenvironment is indicated by Q, Q+Q&#x2267;0.6 and Q/(Q+Q)&#x2267;0.5, and furthermore, the decomposition ratio of Brilliant Blue generated by the photocatalytic activity of the zinc oxide particles is 3% or less.

Silicon-oxide-coated zinc oxide and method for manufacturing same, silicon-oxide-coated-zinc-oxide-containing composition, and cosmetic

Zinc oxide powder of the present invention has a specific surface area which is in a range of 1.5 m/g to 65 m/g, a conductivity which is 150 &#x3bc;S/cm or less and a bulk specific volume which is in a range of 0.5 mL/g to 10 mL/g.

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Tokyo, Japan

Syunsuke Suma