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

Patent metadata

Field	Value
Publication number	US-2017095407-A1
Application number	US-201515126140-A
Country	US
Kind code	A1
Filing date	Mar 30, 2015
Priority date	Mar 31, 2014
Publication date	Apr 6, 2017
Grant date	—

Abstract

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 Q 3 environment is indicated by Q 3 , and an abundance ratio in a Q 4 environment is indicated by Q 4 , Q 3 +Q 4 ≧0.6 and Q 4 /(Q 3 +Q 4 )≧0.5 are satisfied.

First claim

1 . A silicon oxide-coated zinc oxide, comprising
zinc oxide particles having an average particle diameter in a range of more than 50 nm and 500 nm or less, and a silicon oxide coating on the surface of the zinc oxide particles; in which, when an abundance ratio of silicon in the silicon oxide coating in a Q 3 environment is indicated by Q 3 , and an abundance ratio in a Q 4 environment is indicated by Q 4 , Q 3 +Q 4 ≧0.6 and Q 4 /(Q 3 +Q 4 )≧0.5.

2 . The silicon oxide-coated zinc oxide according to claim 1 ,
wherein the zinc oxide particles has a decomposition ratio of Brilliant Blue generated by a photocatalytic activity of the zinc oxide particles of 3% or less.

3 . The silicon oxide-coated zinc oxide according to claim 1 or 2 ,
wherein a content rate of the zinc oxide particles is in a range of 50% by mass or more and 99% by mass or less.

4 . The silicon oxide-coated zinc oxide according to claim 1 ,
wherein, when the silicon oxide-coated zinc oxide is immersed in an aqueous solution having a hydrogen-ion exponent of 5 so that the content thereof reaches 0.05% by mass, an elution ratio of zinc being eluted in the aqueous solution is 60% by mass or less.

5 . The silicon oxide-coated zinc oxide according to claim 4 ,
wherein the elution ratio of zinc being eluted in the aqueous solution is 20% by mass or less.

6 . A method for producing the silicon oxide-coated zinc oxide comprising:
suspending zinc oxide particles in a solvent so as to produce a zinc oxide suspension; adding any one or more of alkoxysilanes and oligomers of alkoxysilanes which are decamers or lower oligomers, a catalyst, and water to the suspension, thereby reacting with the suspension to obtain a reaction product; and thermally treating the obtained reaction product at a temperature in a range of 150° C. or more and less than 600° C.

7 . The method for producing the silicon oxide-coated zinc oxide according to claim 6 ,
wherein the zinc oxide suspension by is prepared by suspending surface-modified zinc oxide particles in a solvent.

8 . The method for producing the silicon oxide-coated zinc oxide according to claim 7 ,
wherein the surface-modified zinc oxide particles are zinc oxide particles coated with a silicon oxide layer.

9 . The method for producing the silicon oxide-coated zinc oxide according to claim 8 ,
wherein an amount of the silicon oxide layers on the surface-modified zinc oxide particles is in a range of 1% by mass or more and 45% by mass or less of zinc oxide particles in terms of silicon oxide.

10 . The method for producing the silicon oxide-coated zinc oxide according to claim 8 ,
wherein the silicon oxide layers on the surface-modified zinc oxide particles are layers made of a composite oxide of silicon oxide and a metal oxide which includes 20% by mass or less of the metal oxide in terms of the oxide.

11 . A composition comprising:
silicon oxide-coated zinc oxide comprising zinc oxide particles having an average particle diameter in a range of more than 50 nm and 500 nm or less, and a silicon oxide coating on the surface of the zinc oxide particles in which, when an abundance ratio of silicon in the silicon oxide coating in a Q 3 environment is indicated by Q 3 , and an abundance ratio in a Q 4 environment is indicated by Q 4 , Q 3 +Q 4 ≧0.6 and Q 4 /(Q 3 +Q 4 )≧0.5, and a solvent.

12 . A cosmetic composition comprising:
the silicon oxide-coated zinc oxide according to claim 1 , and a base.

13 . The cosmetic composition according to claim claim 12 , further comprising:
a solvent.

Assignees

• Sumitomo Osaka Cement Co Ltd

Inventors

• Itagaki Tetsuro
• Fujihashi Gaku
• SUMA Syunsuke

Classifications

• C09C1/043

  Zinc oxide · CPC title

• A61K2800/412

  Microsized, i.e. having sizes between 0.1 and 100 microns · CPC title

• A61K2800/621

  by inorganic compounds · CPC title

• A61K2800/413

  Nanosized, i.e. having sizes below 100 nm · CPC title

• C01P2004/84

  one phase coated with the other · CPC title