Effect pigments with high chroma and high brilliancy, method for the production and use thereof
AssigneeEckart GmbH
InventorsMichael Grüner, Günter Kaupp, Ralph Schneider
Life of this patent
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Abstract
The invention relates to an absorbent effect pigment including a nonmetallic substrate in platelet form and a coating applied thereto, wherein the coating includes at least one spacer layer. The invention further relates to a process for production of and to the use of the absorbent effect pigment.
Claims33
An absorbent effect pigment comprising a nonmetallic substrate in platelet form and a coating applied to the substrate, wherein the coating comprises
- a) optionally a layer 1 comprising or consisting of at least one of tin oxide, tin hydroxide or tin oxide hydrate,
- b) a layer 2 having a high refractive index n>1.8, the layer 2 comprising at least one of metal oxide, metal hydroxide or metal oxide hydrate, and
- c) a layer 3 having a high refractive index n>1.8, the layer 3 comprising at least one of metal oxide, metal hydroxide or metal oxide hydrate,
- at least one of layers 2 and 3 comprises at least two different metal ions and layers 2 and 3 are interrupted by a spacer layer, wherein the at least one spacer layer comprises connections and cavities.
An absorbent effect pigment comprising a nonmetallic substrate in platelet form and a coating applied to the substrate, wherein the coating comprises
- a) optionally a layer 1 comprising or consisting of at least one of tin oxide, tin hydroxide or tin oxide hydrate,
- b) a layer 2 having a high refractive index n>1.8, the layer comprising at least one of metal oxide, metal hydroxide or metal oxide hydrate, and
- c) a layer 3 having a high refractive index n>1.8, the layer comprising at least one of metal oxide, metal hydroxide or metal oxide hydrate,
- at least one of layers 2 and 3 comprises at least two different metal ions and layers 2 and 3 are interrupted by a spacer layer, wherein the at least one spacer layer comprises connections and cavities, and wherein the spacer layer has a standard deviation of the relative height of σhRma in a range of 0.2 to 18%, wherein the relative height hRma is defined as the ratio of the height hma to the layer thickness of the overall coating and hma refers to the sum total of the layer thickness of optional layer 1, layer 2 and half the height ha of the spacer layer.
An absorbent effect pigment comprising a nonmetallic substrate in platelet form and a coating applied to the substrate, wherein the coating comprises
- a) optionally a layer 1 comprising or consisting of at least one of tin oxide, tin hydroxide or tin oxide hydrate,
- b) a layer 2 having a high-refractive index n>1.8 the layer 2 comprising at least one of metal oxide, metal hydroxide or metal oxide hydrate, and
- c) a layer 3 having a high-refractive index n>1.8, the layer 3 comprising at least one of metal oxide, metal hydroxide or metal oxide hydrate,
- at least one of layers 2 and 3 comprises at least two different metal ions and layers 2 and 3 are interrupted by a spacer layer, wherein the spacer layer comprises connections and cavities and wherein the spacer layer comprises an area proportion of cavities from a range of 51% 99%, measured from scanning electron micrographs of traverse sections.
Dependencies are inferred from the claim text.