Use of iron oxide coated aluminum flakes having red 1st order interference color in coatings

Patent metadata

Field	Value
Publication number	US-10894884-B2
Application number	US-201615740864-A
Country	US
Kind code	B2
Filing date	Jun 28, 2016
Priority date	Jun 30, 2015
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

The use of an effect pigment (a) comprising an aluminum-based substrate and an iron oxide coating having a red 1 st order interference color in combination with a colored absorption pigment (b) for producing a coating having enhanced coloristic properties, in particular enhanced chroma, lightness and hiding power, is provided. The pigment combination of (a) and (b) is suitable for coloring plastics, a fiber, a film and a coating composition such as a paint, a printing ink, a varnish or a powder coating, preferably an automotive, an architectural or an industrial coating composition.

First claim

The invention claimed is:

1. A method for producing a coating having an enhanced coloristic property, the method comprising:
coating an article with an effect pigment (a) and a colored absorption pigment (b),
wherein the effect pigment (a) comprises an aluminum-based substrate and an iron oxide coating having a red 1 st order interference color,
the colored absorption pigment (b) comprises an organic transparent pigment, an inorganic transparent pigment, or both, where the organic transparent pigment is at least one red-hued pigment selected from the group consisting of an anthraquinone pigment, a diketopyrrolopyrrole pigment, an isoindolinone pigment, a metal complex pigment, a perylene pigment, and an indigo pigment,
a weight ratio of the effect pigment (a) to the colored absorption pigment (b) is from 95:5 to 5:95, and
the effect pigment (a) and the colored absorption pigment (b) are in a dispersed form.

2. The method according to claim 1 ,
wherein the weight ratio of the effect pigment (a) to the colored absorption pigment (b) is from 90:10 to 30:70.

3. The method according to claim 1 ,
wherein the colored absorption pigment (b) is the organic transparent pigment and is a perylene pigment.

4. The method according to claim 1 , wherein the colored absorption pigment (b) is the inorganic transparent pigment and is a yellow or red iron oxide.

5. The method according to claim 1 ,
wherein the effect pigment (a) is coated by a chemical vapor deposition process.

6. The method according to claim 1 ,
wherein the effect pigment (a) comprises an aluminum substrate which is optionally passivated with a layer of a metal phosphate, silica, aluminum oxide, hydrated aluminum oxide or a combination thereof.

7. The method according to claim 1 ,
wherein the coating is an automotive coating, an architectural coating or an industrial coating.

8. A process for enhancing a coloristic property of a coating, comprising:
contacting an effect pigment (a) and a colored absorption pigment (b) in the coating,
wherein the effect pigment (a) comprises an aluminum-based substrate and an iron oxide coating having a red 1 st order interference color,
the colored absorption pigment (b) comprises an organic transparent pigment, an inorganic transparent pigment, or both, where the organic transparent pigment is at least one red-hued pigment selected from the group consisting of an anthraquinone pigment, a diketopyrrolopyrrole pigment, an isoindolinone pigment, a metal complex pigment, a perylene pigment, and an indigo pigment,
a weight ratio of the effect pigment (a) to the colored absorption pigment (b) is from 95:5 to 5:95, and
the effect pigment (a) and the colored absorption pigment (b) are in a dispersed form.

9. A pigment combination, comprising:
(a) an effect pigment comprising an aluminum-based substrate and an iron oxide coating having a red 1 st order interference color; and
(b) a colored absorption pigment comprising an organic transparent pigment, an inorganic transparent pigment, or both, where the organic transparent pigment is at least one red-hued pigment selected from the group consisting of an anthraquinone pigment, a diketopyrrolopyrrole pigment, an isoindolinone pigment, a metal complex pigment, a perylene pigment, and an indigo pigment,
wherein a weight ratio of the effect pigment (a) to the colored absorption pigment (b) is from 95:5 to 5:95, and
the effect pigment (a) and the colored absorption pigment (b) are in a dispersed form.

10. The pigment combination according to claim 9 , wherein the weight ratio of the effect pigment (a) to the colored absorption pigment (b) is from 90:10 to 30:70.

11. A method for coloring an article, comprising:
contacting the article with the pigment combination according to claim 9 ,
wherein the article is a plastic, a fiber, a film or a coating composition.

12. An article coated with a composition comprising the pigment combination of claim 9 .

13. An automotive coating, comprising:
the pigment combination of claim 9 .

14. The method according to claim 1 ,
wherein the method is suitable for enhancing chroma, lightness and/or hiding power.

15. The method according to claim 1 ,
wherein the weight ratio of the effect pigment (a) to the colored absorption pigment (b) is from 75:25 to 20:80.

16. The method according to claim 3 ,
wherein the organic transparent pigment is in the form of a solid solution or a mixed crystal.

17. The method according to claim 11 , wherein the coating composition is a paint, a printing ink, a varnish or a powder coating.

18. The pigment combination according to claim 9 , wherein a weight ratio of the effect pigment (a) to the colored absorption pigment (b) is from 90:10 to 30:70, and the colored absorption pigment (b) is the organic transparent pigment and is a red perylene pigment.

19. The method according to claim 1 , wherein the coating has enhanced chroma, lightness and/or hiding power as compared to a coating produced by a method comprising coating the article with an effect pigment having an orange 2 nd order interference color and the colored absorption pigment (b).

20. The method according to claim 1 , wherein the effect pigment (a) consists of a pigment having the aluminum-based substrate and the iron oxide coating having the red 1st order interference color.

Assignees

• Basf Se

Inventors

• Schmid Raimund
• Wosylus Aron
• Schwidetzky Christoph

Classifications

• A61K2800/436

  Interference pigments, e.g. Iridescent, Pearlescent · CPC title

• C09C1/642

  treated with inorganic compounds · CPC title

• A61K2800/621

  by inorganic compounds · CPC title

• C09C1/0015

  Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings · CPC title

• A61Q1/02

  Preparations containing skin colorants, e.g. pigments (preparations in powder form A61Q1/12) · CPC title