Zinc oxide particle, method for producing the same, ultraviolet shielding agent, and cosmetic
AssigneeSakai Chemical Industry Co., Ltd.
InventorsSatoru Sueda, Mitsuo Hashimoto, Mizuho Wada
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Abstract
It is one of the objects of the present disclosure to provide hexagonal plate-shaped zinc oxide particles having suitable performances derived from the shape thereof, that is, zinc oxide particles having improved ultraviolet shielding ratio at the wavelength of 400 nm or less without impairing the direct transition properties of electronic excitation thereof and having remarkably improved ultraviolet shielding ratio for UV-B radiation and UV-A radiation. A zinc oxide particle containing a solid solution of a Ti element and/or a Fe element and a Zn element in at least a portion thereof, and having a hexagonal plate shape.
Claims7
A coated zinc oxide particle comprising a zinc oxide particle and a layer covering a surface of the zinc oxide particle,
- wherein the zinc oxide particle has a hexagonal plate shape with an aspect ratio of 2.5 or more and a primary particle diameter of 0.01 μm to 100 μm, and
- the layer is formed essentially of Zn2TiO4 and/or ZnFe2O4.
Dependencies are inferred from the claim text.