Electroconductive particles

Patent metadata

Field	Value
Publication number	US-9245662-B2
Application number	US-201313971318-A
Country	US
Kind code	B2
Filing date	Aug 20, 2013
Priority date	Sep 14, 2012
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

An electroconductive particle having a core particle and a tin oxide-containing coating layer on the core particle. The tin oxide of the coating layer has a crystallite size of 70 to 200 Å. The electroconductive particle preferably has a ratio of R 3 to R 1 of 1 to 250, wherein R 1 and R 3 are respective surface resistivities of electroconductive films formed of a coating composition containing the electroconductive particle and prepared by 1-hour dispersing and 3-hour dispersing, respectively. The coating layer preferably comprises dopant element-free, electroconductive tin oxide.

First claim

The invention claimed is:

1. An electroconductive particle, comprising:
a core particle comprising titanium oxide, barium sulfate, alumina, or silica; and
a dopant element-free tin oxide-containing coating layer located on the core particle, the tin oxide of the coating layer having a crystallite size of 70 to 200 Å.

2. The electroconductive particle according to claim 1 , wherein the core particle is titanium oxide, and the electroconductive particle shows an apparent density change represented by formula [(A−B)/A×100] of 0% to 20%, wherein A is an apparent density (g/cm 3 ) measured under a pressure of 0.20 N/m 2 , and B is an apparent density (g/cm 3 ) measured under a pressure of 0.02 N/m 2 .

3. The electroconductive particle according to claim 1 , wherein the core particle is barium sulfate, and the electroconductive particle shows an apparent density change represented by formula [(A−B)/A×100] of 0% to 26%, wherein A is an apparent density (g/cm 3 ) measured under a pressure of 0.20 N/m 2 , and B is an apparent density (g/cm 3 ) measured under a pressure of 0.02 N/m 2 .

4. An electroconductive composition comprising the electroconductive particle according to claim 1 .

5. The electroconductive particle according to claim 1 , wherein the core particle has an average particle size of 30 to 500 nm.

6. The electroconductive particle according to claim 1 , having a tin oxide content of 15 mass % or more.

7. The electroconductive particle according to claim 1 , having a tin oxide content of 20 to 60 mass %.

8. The electroconductive particle according to claim 1 , wherein the crystallite size is 72 to 200 Å.

9. The electroconductive particle according to claim 1 , wherein an oxygen deficiency of the tin oxide is defined in terms of tint in CIE L*a*b* color space where L* has a value of 80 to 95, a* has a value of −2.0 to 2.0 and b* has a value of −2.0 to 10.0.

10. The electroconductive particle according to claim 1 , wherein an oxygen deficiency of the tin oxide is defined in terms of tint in CIE L*a*b* color space where L* has a value of 83 to 93, a* has a value of −0.5 to 0.5 and b* has a value of −1.0 to 9.0.

11. The electro conductive particle according to claim 1 , having a ratio of R 3 to R 1 of 1 to 250, wherein R 1 is a surface resistivity of an electroconductive film formed of a coating composition containing the electroconductive particle and prepared by 1-hour dispersing, and R 3 is a surface resistivity of an electroconductive film formed of a coating composition containing the electroconductive particle and prepared by 3-hour dispersing.

12. An electroconductive particle, comprising:
a core particle comprising titanium oxide, barium sulfate, alumina, or silica; and
a dopant element-free tin oxide-containing coating layer located on the core particle, the tin oxide of the coating layer having a crystallite size of 75 to 200 Å.

13. The electroconductive particle according to claim 12 , wherein the core particle is titanium oxide, and the electroconductive particle shows an apparent density change represented by formula [(A−B)/A×100] of 0% to 20%, wherein A is an apparent density (g/cm 3 ) measured under a pressure of 0.20 N/m 2 , and B is an apparent density (g/cm 3 ) measured under a pressure of 0.02 N/m 2 .

14. The electroconductive particle according to claim 12 , wherein the core particle is barium sulfate, and the electroconductive particle shows an apparent density change represented by formula [(A−B)/A×100] of 0% to 26%, wherein A is an apparent density (g/cm 3 ) measured under a pressure of 0.20 N/m 2 , and B is an apparent density (g/cm 3 ) measured under a pressure of 0.02 N/m 2 .

15. The electroconductive particle according to claim 12 , wherein an oxygen deficiency of the tin oxide is defined in terms of tint in CIE L*a*b* color space where L* has a value of 80 to 95, a* has a value of −2.0 to 2.0 and b* has a value of −2.0 to 10.0.

16. The electroconductive particle according to claim 15 , having a ratio of R 3 to R 1 of 1 to 250, wherein R 1 is a surface resistivity of an electroconductive film formed of a coating composition containing the electroconductive particle and prepared by 1-hour dispersing, and R 3 is a surface resistivity of an electroconductive film formed of a coating composition containing the electroconductive particle and prepared by 3-hour dispersing.

Assignees

• Mitsui Mining & Smelting Co

Inventors

• Nara Akihiro
• Iseki Hiroyuki
• Sakaue Takahiko

Classifications

• C01P2002/60

  Compounds characterised by their crystallite size · CPC title

• C09D5/24

  Electrically-conducting paints {(conductive materials H01B1/00)} · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title

• H01B1/08 Primary

  oxides · CPC title

• C01P2006/40

  Electric properties · CPC title