Golden effect pigments
A golden effect pigment comprising an optionally passivated platelet-shaped metallic substrate and an iron oxide layer, wherein the effect pigment has a hue angle h 15 of 67°≤h 15 ≤78° and a chroma C* 15 of ≥90 is provided. Further, a golden effect pigment comprising an optionally passivated platelet-shaped metallic substrate and an iron oxide layer, wherein the effect pigment has a hue angle h 15 of 67°≤h 15 ≤78° and a chroma C* 45 of ≥50 is provided. The golden effect pigments are highly chromatic and suitable for coloring a coating composition such as a paint, a printing ink, an ink, a varnish, plastics, a fiber, a film or a cosmetic preparation, preferably an automotive, an architectural or an industrial coating composition.
1. A golden effect pigment comprising:
a passivated platelet-shaped aluminum or aluminum alloy substrate and an iron oxide layer,
wherein the effect pigment has a hue angle h 15 of 67°≤h15≤78° and a chroma C* 15 of ≥90.
2. The golden effect pigment according to claim 1 , wherein the platelet-shaped aluminum or aluminum alloy substrate is passivated with a layer of a metal phosphate, silica, aluminum oxide, hydrated aluminum oxide or a combination thereof.
3. The golden effect pigment according to claim 1 ,
wherein the golden effect pigment has a median diameter d 50 of 8 μm≤d 50 ≤22 μm.
4. The golden effect pigment according to a claim 1 ,
wherein the golden effect pigment has a median diameter of 8 μm≤d 50 ≤12.5 μm or 13 μm≤d 50 ≤22 μm.
5. The golden effect pigment according to claim 1 ,
wherein the iron oxide layer has an average thickness of 60 to 160 nm.
6. The golden effect pigment according to claim 1 ,
wherein the golden effect pigment has a median diameter of 13 μm≤d 50 ≤22 μm and has a chroma C* 15 of ≥110.
7. The golden effect pigment according to claim 1 ,
wherein the golden effect pigment comprises one or more additional layers on the iron oxide layer.
8. The golden effect pigment according to claim 7 , wherein the one or more additional layers are at least one selected from the group consisting of a silica layer, an organosilane layer and a polymer layer.
9. A pigment combination comprising:
(a) the golden effect pigment of claim 1 ;
(b) a colored absorption pigment; and
(c) optionally a further effect pigment;
wherein a weight ratio of the golden effect pigment (a) to pigment (b) and optional pigment (c) is of from 95:5 to 5:95.
10. A colored coating composition, comprising the golden effect pigment according to claim 1 ,
wherein the coating composition comprises a paint, a printing ink, an ink, a varnish, plastics, a fiber, a film or a cosmetic preparation.
11. An article coated with a composition comprising the golden effect pigment of claim 1 .
12. An automotive coating, which is colored with the golden effect pigment of claim 1 .
13. A method of manufacturing the golden effect pigment according to claim 1 , the method comprising:
(a) providing a passivated platelet-shaped aluminum or aluminum alloy substrate, and
(b) coating the passivated platelet-shaped aluminum or aluminum alloy substrate in a liquid medium comprising an iron oxide precursor compound.
14. A method of coloring a coating composition comprising a paint, a printing ink, an ink, a varnish, plastics, a fiber, a film or a cosmetic preparation, the method comprising:
adding thereto the golden effect pigment of claim 1 .
15. A golden effect pigment comprising:
a passivated platelet-shaped aluminum or aluminum alloy substrate and an iron oxide layer,
wherein the golden effect pigment has a hue angle h 15 of 67°≤h 15 ≤78° and a chroma C* 45 of ≥50.
16. The golden effect pigment according to claim 15 ,
wherein the golden effect pigment has a median diameter of 8 μm≤d 50 ≤12.5 μm.