Use of iron oxide coated aluminum flakes having red 1
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.
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.