Use of iron oxide coated aluminum flakes having red 1st order interference color in coatings
AssigneeBASF SE
InventorsRaimund Schmid, Aron Wosylus, Christoph Schwidetzky
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Abstract
The use of an effect pigment (a) comprising an aluminum-based substrate and an iron oxide coating having a red 1st 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.
Claims20
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 1st 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.
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 1st 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.
A pigment combination, comprising:
- (a) an effect pigment comprising an aluminum-based substrate and an iron oxide coating having a red 1st 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.
Dependencies are inferred from the claim text.