Colorant including a mixture of pigments

Patent metadata

Field	Value
Publication number	US-10189997-B2
Application number	US-201715790854-A
Country	US
Kind code	B2
Filing date	Oct 23, 2017
Priority date	Oct 1, 2012
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A colorant including a mixture of pigments is disclosed. The pigments have a similar coloration but different resistance to corrosion. The mixing ratio is selected to optimize the corrosion resistance against color brightness, and/or acidic corrosion resistance against alkali corrosion resistance of the colorant.

First claim

What is claimed is:

1. A colorant comprising:
a first pigment; and
a second pigment,
wherein the second pigment comprises a plurality of layers,
wherein the plurality of layers include a particular layer, and
wherein the particular layer is a reflective ferrochrome (FeCr) layer.

2. The colorant of claim 1 , wherein the particular layer includes chromium.

3. The colorant of claim 1 , wherein the first pigment includes a plurality of color-shifting interference flakes.

4. The colorant of claim 1 , wherein the first pigment includes a dielectric magnesium fluoride (MgF 2 ) layer.

5. The colorant of claim 1 , wherein the first pigment includes a reflective opaque aluminum (Al) layer.

6. The colorant of claim 1 , wherein the first pigment includes one or more semi-transparent chromium (Cr) layers.

7. The colorant of claim 1 , wherein the particular layer is between two or more other layers of the plurality of layers.

8. The colorant of claim 1 , wherein the plurality of layers further include silicon dioxide (SiO 2 ) dielectric layers.

9. The colorant of claim 1 , wherein the first pigment and the second pigment have a chroma of at least 10 units in an L*a*b* color space.

10. The colorant of claim 1 , wherein a color difference hue between the first pigment and the second pigment is no more than 30 hue degrees in a polar projection of an L*a*b* color space.

11. A colorant comprising:
a pigment,
wherein the pigment comprises a plurality of layers,
wherein the plurality of layers include a particular layer between two other layers of the plurality of layers, and
wherein the particular layer is a reflective ferrochrome (FeCr) layer.

12. The colorant of claim 11 , further comprising:
another pigment that includes a plurality of chromium (Cr) layers.

13. The colorant of claim 11 , further comprising:
another pigment that includes an aluminum (Al) layer between four other layers.

14. The colorant of claim 11 , further comprising:
another pigment that includes a dielectric magnesium fluoride (MgF 2 ) layer and a chromium (Cr) layer.

15. The colorant of claim 11 , where the two other layers include dielectric magnesium fluoride (MgF 2 ) layers.

16. The colorant of claim 11 , where the two other layers include semi-transparent bismuth (Bi) layers.

17. The colorant of claim 11 , where the two other layers include semi-transparent iron (Fe) layers.

18. The colorant of claim 11 ,
wherein the pigment is a first pigment, and
wherein the colorant is a mixture of the first pigment and a second pigment.

19. The colorant of claim 18 , wherein a color difference hue between the first pigment and the second pigment is no more than 30 hue degrees in a polar projection of an L*a*b* color space.

20. The colorant of claim 18 ,
wherein the first pigment exhibits a higher color change ΔE*B in a basic solution than the second pigment, and
wherein the second pigment exhibits a higher color change ΔE*A in an acidic solution than the first pigment.

Assignees

• Viavi Solutions Inc

Inventors

• Delst Cornelis Jan
• Raksha Vladimir P
• De La Fuente David

Classifications

• C09C3/04 Primary

  Physical treatment, e.g. grinding or treatment with ultrasonic vibrations {(C09C3/006 takes precedence)} · CPC title

• C09C1/0078

  Pigments consisting of flaky, non-metallic substrates, characterised by a surface-region containing free metal · CPC title

• C01P2006/66

  Hue (H*) · CPC title

• C01P2006/65

  Chroma (C*) · CPC title

• C09C1/0081

  Composite particulate pigments or fillers, i.e. containing at least two solid phases, except those consisting of coated particles of one compound (C09C1/0015, C09C1/0078 take precedence) · CPC title