Pleochroism powder and pleochroism printed article

• US 20030108722A1
• Filed: 06/05/2002
• Published: 06/12/2003
• Est. Priority Date: 03/23/1999
• Status: Active Grant

• Current Assignee: Shiseido Company Limited
• Original Assignee: Shiseido Company Limited
• Inventors: Yoda, Yukie, Sakuma, Kenichi, Wada, Masayoshi, Kimura, Asa
• Granted Patent: US 7,022,409 B2
• Time in Patent Office: Days
• US Class Current: 428/195.1
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2006/62 L* (lightness axis)
• CPC Class Codes: C01P 2006/63 a* (red-green axis)
• CPC Class Codes: C01P 2006/64 b* (yellow-blue axis)
• CPC Class Codes: C09C 1/0015 Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings
• CPC Class Codes: C09C 2200/102 the core consisting of glass or silicate material like mica or clays, e.g. kaolin
• CPC Class Codes: C09C 2220/106 comprising only a drying or calcination step of the finally coated pigment
• CPC Class Codes: Y10T 428/12181 Composite powder [e.g., coated, etc.]
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2993 Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]

Abstract

A multi color changing powder with a bluish base appearance color of which color tone varies according to the observation direction is provided. A pleochroism powder of the present invention comprises a flaky mica having a coating which consists of two layers wherein one of said two layers is a first layer comprising a metal oxide of titanium coated on said flaky mica and the other is a second layer comprising metal oxides of cobalt and aluminum coated on said first layer.

Claims

1. A pleochroism powder which comprises a flaky mica having a coating which consists of two layers:

wherein one of said two layers is a first layer comprising a metal oxide of titanium coated on said flaky mica and the other is a second layer comprising metal oxides of cobalt and aluminum coated on said first layer.

2. The pleochroism powder according to claim 1, wherein said first layer essentially consists of titanium dioxide.

3. The pleochroism powder according to claim 2, wherein said second layer essentially consists of cobalt aluminate.

4. The pleochroism powder according to claim 3, wherein cobalt titanate is comprised near the interface of said first layer and second layer.

5. The pleochroism powder according to claim 4, wherein said cobalt titanate near the interface of said first layer and second layer is formed by calcinating a composition comprising titanium dioxide coated mica, a cobalt compound and an aluminum compound.

6. The pleochroism powder according to claim 1, wherein a mole ratio of said metal oxides is 50 to 91.5% of titanium dioxide, 7.5 to 49% of cobalt and 1 to 20% of aluminum.

7. The pleochroism powder according to claim 1, wherein a mole ratio of said metal oxides is 50 to 96.5% of titanium dioxide, 2.5 to 7.5% of cobalt and 1 to 47.5% of aluminum.

8. The pleochroism powder according to claim 1, wherein a mole ratio of said metal oxides is 50 to 72.5% of titanium dioxide, 7.5 to 30% of cobalt and 20 to 42.5% of aluminum.

9. The pleochroism powder according to claim 1, wherein a mole ratio of said metal oxides is 50 to 98% of titanium dioxide, 1 to 2.5% of cobalt and 1 to 49% of aluminum.

10. The pleochroism powder according to claim 1, wherein hue of an appearance color of the pleochroism powder is within a range:

a;

−

31.13 to 11.35;

b;

−

29.46 to 31.22; and

L;

30.82 to 88.23 wherein L, a, b values are values reported using a standard Hunter L, a, b color scale.

15. A pleochroism printed article comprising a base material and a layer of a composition coated on the surface thereof, said composition comprising the pleochroism powder of claim 1, and wherein different colors of said pleochroism printed article are observed by changing the observation angle of incident light.

16. The pleochroism printed article according to claim 15, wherein said base material has a color included in a set of gray scale colors that ranges from white to black.

17. The pleochroism printed article according to claim 15, wherein said base material has a blue color.

18. The pleochroism printed article according to claims 15, wherein thickness of said layer of the composition is 5 μ

m or more.

11. A pleochroism powder comprising a mixture of:

a titanium dioxide coated flaky mica which generates a reflected interference color; and

a pigment or a dye having a color which is substantially complementary color to said reflected interference color.

12. The pleochroism powder according to claim 11`, wherein said reflected interference color is gold and said pigment or a dye has a blue color.

13. The pleochroism powder according to claim 12, wherein said pigment or a dye is in the amount of 2.5˜

30.0 wt % with respect to the amount of the titanium dioxide coated mica.

14. The pleochroism powder according to claim 13, wherein said a pigment or a dye is cobalt blue.

19. A pleochroism printed article comprising a base material and a layer of a composition coated on the surface thereof, said composition comprising the pleochroism powder of claim 11, and wherein different colors of said pleochroism printed article are observed by changing the observation angle of incident light.

20. A pleochroism printed article comprising a base material, a layer of a first composition coated on the surface of said base material, and a layer of a second composition coated on the surface of said layer of the first composition, said first composition comprising titanium dioxide coated mica which generates a reflected interference color and said second composition comprising a pigment or a dye having substantially complementary color to reflected interference color of said titanium dioxide coated mica, and wherein different colors of said pleochroism printed article are observed by changing the observation angle of incident light.