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

Patent metadata

Field	Value
Publication number	US-9642785-B2
Application number	US-201414783135-A
Country	US
Kind code	B2
Filing date	Mar 31, 2014
Priority date	Apr 19, 2013
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

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 Q 3 environment is indicated by Q 3 , and the 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 furthermore, the decomposition ratio of Brilliant Blue generated by the photocatalytic activity of the zinc oxide particles is 3% or less.

First claim

The invention claimed is:

1. A silicon-oxide-coated zinc oxide formed by coating the surfaces of zinc oxide particles with a silicon oxide coating, wherein the average particle diameter of the zinc oxide particles is in a range of 1 nm to 50 nm, and when the abundance ratio of silicon in the silicon oxide coating in a Q 3 environment is indicated by Q 3 , and the 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 content ratio of the zinc oxide particles is in a range of 50% by mass to 90% by mass.

3. 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 pH of 5 so that the content thereof reaches 0.05% by mass, the elution ratio of zinc being eluted in the aqueous solution is 60% by mass or less.

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

5. The silicon-oxide-coated zinc oxide according to claim 4 ,
wherein the content ratio of the zinc oxide particles is in a range of 50% by mass to 90% by mass.

6. The silicon-oxide-coated zinc oxide according to claim 4 ,
wherein, when the silicon-oxide-coated zinc oxide is immersed in an aqueous solution having a pH of 5 so that the content thereof reaches 0.05% by mass, the elution ratio of zinc being eluted in the aqueous solution is 20% by mass or less.

7. The silicon-oxide-coated zinc oxide according to claim 1 ,
wherein the surfaces of the silicon-oxide-coated zinc oxide are surface-treated with a silicone resin.

8. A method for manufacturing the silicon-oxide-coated zinc oxide according to claim 1 ,
wherein zinc oxide particles are suspended in a solvent so as to produce a zinc oxide suspension, next, any one or more of alkoxysilanes and oligomers of an alkoxysilane which are decamers or lower oligomers, a catalyst, and water are added to and reacted with the zinc oxide suspension, and then the obtained reaction product is thermally treated at a temperature in a range of 200° C. to 550° C.

9. A method for manufacturing the silicon-oxide-coated zinc oxide according to claim 4 ,
wherein a surface-modified zinc oxide is suspended in a solvent so as to produce a surface-modified zinc oxide suspension,
next, any one or more of alkoxysilanes and oligomers of an alkoxysilane which are decamers or lower oligomers, a catalyst, and water are added to and reacted with the surface-modified zinc oxide suspension, and then
the obtained reaction product is thermally treated at a temperature in a range of 200° C. to lower than 600° C.

10. A silicon-oxide-coated-zinc-oxide-containing composition comprising:
the silicon-oxide-coated zinc oxide according to claim 1 and a solvent.

11. The silicon-oxide-coated-zinc-oxide-containing composition according to claim 10 , further comprising:
a viscosity improver.

12. A cosmetic formed by including the silicon-oxide-coated zinc oxide according to claim 1 in a cosmetic base.

13. A cosmetic formed by including the silicon-oxide-coated-zinc-oxide-containing composition according to claim 10 in a cosmetic base.

Assignees

• Sumitomo Osaka Cement Co Ltd

Inventors

• Itagaki Tetsuro
• Kusahara Yoshiki
• Fujihashi Gaku
• SUMA Syunsuke

Classifications

• A61K2800/621

  by inorganic compounds · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• C09C1/043

  Zinc oxide · CPC title

• C01P2002/86

  by NMR- or ESR-data · CPC title

• A61Q17/04

  Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations · CPC title