Hexagonal prism-shaped zinc oxide particles, method for production of the same, and cosmetic, heat releasing filler, heat releasing resin composition, heat releasing grease, and heat releasing coating composition comprising the same

Patent metadata

Field	Value
Publication number	US-9404195-B2
Application number	US-201214113108-A
Country	US
Kind code	B2
Filing date	Apr 26, 2012
Priority date	Apr 28, 2011
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

It is an object of the present invention to provide hexagonal prism-shaped zinc oxide particles which have a specific particle diameter and a specific aspect ratio, and high ultraviolet blocking performance and transparency, and therefore can be suitably used as a cosmetic and a heat releasing material. Provided are hexagonal prism-shaped zinc oxide particles having a primary particle diameter of 0.1 μm or more and less than 0.5 μm and an aspect ratio of less than 2.5.

First claim

The invention claimed is:

1. Hexagonal prism-shaped particles consisting of zinc oxide having a primary particle diameter of 0.1 μm or more and less than 0.5 μm and an aspect ratio of less than 2.5.

2. The hexagonal prism-shaped particles according to claim 1 , which are obtained by aging zinc oxide fine particles as a seed in an aqueous solution in which a zinc salt is dissolved.

3. The hexagonal prism-shaped particles according to claim 1 wherein the D90/D10 in particle size distribution is 2.4 or less.

4. A method for production of the particles according to claim 1 , comprising a step of aging zinc oxide fine particles as a seed in an aqueous solution in which a zinc salt is dissolved.

5. A cosmetic comprising the hexagonal prism-shaped particles according to claim 1 .

6. A heat releasing filler comprising the hexagonal prism-shaped particles according to claim 1 .

7. A heat releasing resin composition comprising the hexagonal prism-shaped particles according to claim 1 .

8. A heat releasing grease comprising the hexagonal prism-shaped particles according to claim 1 .

9. A heat releasing coating composition comprising the hexagonal prism-shaped particles according to claim 1 .

10. The hexagonal prism-shaped particles according to claim 2 , wherein the D90/D10 in particle size distribution is 2.4 or less.

11. A method for production of the particles according to claim 2 , comprising a step of aging zinc oxide fine particles as a seed in an aqueous solution in which a zinc salt is dissolved.

12. A method for production of the particles according to claim 3 , comprising a step of aging zinc oxide fine particles as a seed in an aqueous solution in which a zinc salt is dissolved.

13. A cosmetic comprising the hexagonal prism-shaped particles according to claim 2 .

14. A cosmetic comprising the hexagonal prism-shaped particles according to claim 3 .

15. A heat releasing filler comprising the hexagonal prism-shaped particles according to claim 2 .

16. A heat releasing filler comprising the hexagonal prism-shaped particles according to claim 3 .

17. A heat releasing resin composition comprising the hexagonal prism-shaped particles according to claim 2 .

18. A heat releasing resin composition comprising the hexagonal prism-shaped particles according to claim 3 .

19. A heat releasing grease comprising the hexagonal prism-shaped particles according to claim 2 .

20. A heat releasing grease comprising the hexagonal prism-shaped particles according to claim 3 .

21. Hexagonal prism-shaped particles consisting of zinc oxide having a primary particle diameter of 0.1 μm or more and less than 0.5 μm and an aspect ratio of less than 2.5, wherein the hexagonal prism-shaped particles are surface-treated.

22. A cosmetic comprising the hexagonal prism-shaped particles according to claim 21 .

23. A heat releasing filler comprising the hexagonal prism-shaped particles according to claim 21 .

24. A heat releasing resin composition comprising the hexagonal prism-shaped particles according to claim 21 .

25. A heat releasing grease comprising the hexagonal prism-shaped particles according to claim 21 .

26. A heat releasing coating composition comprising the hexagonal prism-shaped particles according to claim 21 .

Assignees

• Sueda Satoru
• Hashimoto Mitsuo
• Terabe Atsuki
• Watanabe Nobuo
• Magara Koichiro
• Sakai Chemical Industry Co

Inventors

• Sueda Satoru
• Hashimoto Mitsuo
• Terabe Atsuki
• Watanabe Nobuo
• Magara Koichiro

Classifications

• C01P2004/12

  with a cylindrical shape · CPC title

• A61K8/27

  Zinc; Compounds thereof · CPC title

• C01G9/02 Primary

  Oxides; Hydroxides · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• A61Q1/00

  Make-up preparations; Body powders; Preparations for removing make-up · CPC title