Effect pigments having high transparency, high chroma and high brilliancy, method for the production and use thereof

Patent metadata

Field	Value
Publication number	US-10934436-B2
Application number	US-201515536206-A
Country	US
Kind code	B2
Filing date	Dec 21, 2015
Priority date	Dec 19, 2014
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

The invention relates to a transparent effect pigment which includes a non-metallic platelet-shaped substrate and a coating applied thereto, wherein the coating has a spacer layer. The invention further relates to a method for the production, as well as the use, of the transparent effect pigment.

First claim

The invention claimed is:

1. A transparent effect pigment comprising a non-metallic platelet-shaped substrate and a coating applied to the substrate, wherein the coating comprises:
a) optionally a layer 1 which comprises or consists 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,
and wherein at least one of layers 2 or 3 comprises at least two different metal ions and layers 2 and 3 are interrupted by a spacer layer formed between layers 2 and 3, wherein the spacer layer has connections in the form of bars arranged at an angle between 5 and 175 degrees to the non-metallic platelet-shaped substrate and cavities and wherein the transparent effect pigment is produced by a method comprising:
(i) optionally applying a non-calcined layer, which comprises or consists of at least one of tin oxide, tin hydroxide or tin oxide hydrate, to the non-metallic platelet-shaped substrate,
(ii) sequentially applying three non-calcined layers A, B and C, in each case made of or with at least one of metal oxide, metal hydroxide or metal oxide hydrate, wherein layers A, B and C are arranged directly on each other and wherein the at least one metal oxide, metal hydroxide and/or metal oxide hydrate applied in layer B, with respect to the metal ion, is different from the metal ion(s) of the metal oxides, metal hydroxides and/or metal oxide hydrates of layer A and layer C,
(iii) calcining the product obtained in step (ii) at a temperature from a range of from 600° C. to 1000° C., obtaining the transparent effect pigment comprising at least one spacer layer,

wherein the three sequentially applied metal oxides, metal hydroxides and/or metal oxide hydrates for producing layers A, B, and C do not comprise or are not a metal ion selected from the group of metals consisting of Si, Mg and Al,
or by a method comprising:
(i) sequentially applying two non-calcined layers B and C, in each case made of or with at least one of metal oxide, metal hydroxide or metal oxide hydrate, to a calcined single- or multi-coated non-metallic substrate, wherein layers B and C are arranged directly on each other and wherein the at least one metal oxide, metal hydroxide and/or metal oxide hydrate applied in layer B, with respect to the metal ion, is different from the metal ion(s) of the metal oxide, metal hydroxide and/or metal oxide hydrate of layer C and the layer which directly adjoins layer B in the direction of the substrate,
(ii) calcining the product obtained in step (i) at a temperature from a range of from 600° C. to 1000° C., obtaining the transparent effect pigment comprising at least one spacer layer,

wherein the two sequentially applied metal oxides, metal hydroxides and/or metal oxide hydrates for producing layers B and C do not comprise or are not a metal ion selected from the group of metals consisting of Si, Mg and Al.

2. The transparent effect pigment according to claim 1 , wherein the non-metallic platelet-shaped substrate is selected from the group consisting of natural mica platelets, synthetic mica platelets, glass platelets, SiO 2 platelets, Al 2 O 3 platelets, kaolin platelets, talc platelets, bismuth oxychloride platelets and mixtures thereof, and the non-metallic platelet-shaped substrate is optionally coated with at least one of metal oxide, metal hydroxide or metal oxide hydrate and calcined.

3. The transparent effect pigment according to claim 1 , wherein the effect pigment comprises further high- and low-refractive-index layers as well as optionally at least one further spacer layer.

4. The transparent effect pigment according to claim 1 , wherein the at least two different metal ions of layer 2 and/or layer 3 are selected from the group of metals consisting of Ti, Fe, Sn, Mn, Zr, Ca, Sr, Ba, Ni, Sb, Ag, Zn, Cu, Ce, Cr and Co.

5. The transparent effect pigment according to claim 1 , wherein the at least two different metal ions of layer 2 and/or 3 are selected from the group of metals consisting of Ti, Fe, Sn and Zr.

6. The transparent effect pigment according to claim 1 , wherein a proportion of non-coloring metal ions selected from the group of metals consisting of Ti, Sn, Zr, Ca, Sr, Ba and Zn is >13 wt.-% in total, and a proportion of coloring metal ions selected from the group of metals consisting of Fe, Ti (II, III), Sn (II), Mn, Ni, Sb, Ag, Cu, Ce, Cr and Co is ≤4 wt.-% in total in the effect pigment, in each case determined by means of XRF analysis, in each case calculated as elemental metal and in each case relative to the total weight of the transparent effect pigment according to the invention.

7. The transparent effect pigment according to claim 1 , wherein the at least one spacer layer is arranged substantially parallel to the surface of the non-metallic platelet-shaped substrate.

8. The transparent effect pigment according to claim 1 , wherein the spacer layer in each case has an average height h a from a range of from 5 nm to 120 nm.

9. A method for producing the transparent effect pigment according to claim 1 , wherein the method comprises:
(i) optionally applying a non-calcined layer, which comprises or consists of at least one of tin oxide, tin hydroxide or tin oxide hydrate, to the non-metallic platelet-shaped substrate,
(ii) sequentially applying three non-calcined layers A, B and C, in each case made of or with at least one of metal oxide, metal hydroxide or metal oxide hydrate, wherein layers A, B and C are arranged directly on each other and wherein the at least one metal oxide, metal hydroxide and/or metal oxide hydrate applied in layer B, with respect to the metal ion, is different from the metal ion(s) of the metal oxides, metal hydroxides and/or metal oxide hydrates of layer A and layer C,
(iii) calcining the product obtained in step (ii) at a temperature from a range of from 600° C. to 1000° C., obtaining the transparent effect pigment comprising at least one spacer layer.

10. A method for producing the transparent effect pigment according to claim 1 , wherein the method comprises the following steps:
(i) sequentially applying two non-calcined layers B and C, in each case made of or with at least one of metal oxide, metal hydroxide or metal oxide hydrate, to a calcined single- or multi-coated non-metallic substrate, wherein layers B and C are arranged directly on each other and wherein the at least one metal oxide, metal hydroxide and/or metal oxide hydrate applied in layer B, with respect to the metal ion, is different from the metal ion(s) of the metal oxide, metal hydroxide and/or metal oxide hydrate of layer C and the layer which directly adjoins layer B in the direction of the substrate,
(ii) calcining the product obtained in step (i) at a temperature from a range of from 600° C. to 1000° C., obtaining the transparent effect pigment comprising at least one spacer layer.

11. The method according to claim 9 , wherein the metal ions contained in layer B diffuse, at least partially, into layer A and/or layer C, forming the at least one spacer layer in the calcined effect pigment.

12. The method according to claim 9 , wherein the two or three sequentially applied metal oxides, metal hydroxides and/or metal oxide hydrates for producing layers B and C or layers A, B and C do not comprise or are not a metal ion selected from the group of metals consisting of Si, Mg and Al.

13. A process for producing a pigmented cosmetic formulation, plastic, f

Assignees

• Eckart Gmbh

Inventors

• Grüner Michael
• Kaupp Günter
• Schneider Ralph

Classifications

• C09C1/0009 Primary

  Pigments for ceramics (C09C1/0015, C09C1/0078 take precedence) · CPC title

• C09C2200/20

  Interference pigments comprising a layer with a concentration gradient or a gradient of the refractive index · CPC title

• C09C2200/304

  Thickness of intermediate layers adjacent to the core, e.g. metallic layers, protective layers, rutilisation enhancing layers or reflective layers · CPC title

• C09C2200/407

  Organosilicon materials, e.g. silanes, silicones · CPC title

• C09C2200/1087

  the core consisting of bismuth oxychloride, magnesium fluoride, nitrides, carbides, borides, lead carbonate, barium or calcium sulfate, zinc sulphide, molybdenum disulphide or graphite · CPC title