Effect pigments based on artificially produced substrates with a narrow size distribution

Patent metadata

Field	Value
Publication number	US-11299636-B2
Application number	US-86414608-A
Country	US
Kind code	B2
Filing date	Nov 25, 2008
Priority date	Feb 20, 2008
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

The invention relates to effect pigments comprising artificial platelet-shaped substrates which have at least one optically active coating, where the effect pigments have a volume-averaged cumulative undersize distribution curve with the characteristic numbers D10, D50 and D90, said cumulative undersize distribution curve having a span ΔD of 0.7-1.4, and the span ΔD being calculated in accordance with formula (I):ΔD=(D90−D10)/D50  (I),and the average thickness of the artificial platelet-shaped substrates being 500 nm to 2000 nm.

First claim

What is claimed is:

1. Effect pigments consisting essentially of artificial platelet-shaped substrates which have only one optically active coating comprising TiO 2 in the rutile or anatase crystal polymorph, wherein in case of the rutile polymorph, the coating is obtained by a process comprising applying SnO 2 to the substrates, applying TiO 2 to the applied SnO 2 , and then calcining the substrates, wherein the effect pigments have a volume-averaged cumulative undersize distribution curve with the characteristic numbers D 10 , D 50 and D 90 , said cumulative undersize distribution curve having a span ΔD of 0.7-1.4, and the span ΔD being calculated in accordance with formula (I):
Δ D =( D 90 −D 10 )/ D 50   (I),

and the average thickness of the artificial platelet-shaped substrates being 500 nm to 2000 nm, wherein the standard deviation of the thickness of the artificial platelet-shaped substrates is 15% to 100%, and wherein the artificial platelet-shaped substrates are substantially transparent and are selected from the group consisting of glass platelets, platelets of synthetic mica, SiO 2 platelets, platelet-shaped bismuth oxychloride, platelet-shaped aluminum oxides, and mixtures thereof.

2. The effect pigments of claim 1 , wherein the average thickness of the artificial platelet-shaped substrates is 750 nm to 1500 nm.

3. The effect pigments of claim 1 , wherein the one optically active coating of the artificial substrates has a refractive index of n≥1.9.

4. Effect pigments consisting essentially of glass platelet-shaped substrates which have only one optically active coating comprising TiO 2 in the rutile or anatase crystal polymorph, wherein in case of the rutile polymorph, the coating is obtained by a process comprising applying SnO 2 to the substrates, applying TiO 2 to the applied SnO 2 , and then calcining the substrates, wherein the effect pigments have a volume-averaged cumulative undersize distribution curve with the characteristic numbers D 10 , D 50 and D 90 , said cumulative undersize distribution curve having a span ΔD of 0.7-1.4, and the span ΔD being calculated in accordance with formula (I):
Δ D =( D 90 −D 10 )/ D 50   (I),

and the average thickness of the platelet-shaped substrates being 500 nm to 2000 nm.

5. The effect pigments of claim 4 , wherein the average thickness of the artificial platelet-shaped substrates is 750 nm to 1500 nm.

6. The effect pigments of claim 4 , wherein the standard deviation of the thickness of the artificial substrates is 15% to 100%.

7. The effect pigments of claim 4 , wherein the one optically active coating of the artificial substrates has a refractive index of n≥1.9.

8. The effect pigments of claim 4 , wherein the average thickness of the artificial platelet-shaped substrates is 750 nm to 1500 nm and the standard deviation of the thickness of the artificial substrates is 20% to 70%.

9. The effect pigments of claim 4 , wherein the average thickness of the artificial platelet-shaped substrates is 750 nm to 1500 nm the span ΔD is within a range of 0.8 to 1.2.

10. The effect pigments of claim 1 , wherein the standard deviation of the thickness of the artificial platelet-shaped substrates is in a range of 15% to 70%.

11. The effect pigments of claim 1 , wherein the standard deviation of the thickness of the artificial platelet-shaped substrates is in a range of 20% to 70%.

12. The effect pigments of claim 1 , wherein the standard deviation of the thickness of the artificial platelet-shaped substrates is in a range of 15% to 70%, and wherein the average thickness of the substrate is 750 nm to 1500 nm.

13. The effect pigments of claim 1 , wherein the standard deviation of the thickness of the artificial platelet-shaped substrates is in a range of 20% to 70%, and wherein the average thickness of the substrate is 750 nm to 1500 nm.

14. The effect pigments of claim 4 , wherein the average thickness of the artificial platelet-shaped substrates is 750 nm to 1500 nm, and wherein the standard deviation of the thickness of the artificial substrates is 15% to 70%.

Assignees

• Kaupp Guenter
• Schmidt Ulrich
• Schumacher Dirk
• Schneider Ralph
• Eckart Gmbh

Inventors

• Kaupp Günter
• Schmidt Ulrich
• Schumacher Dirk
• Schneider Ralph

Classifications

• A61Q1/12

  Face or body powders for grooming, adorning or absorbing · CPC title

• A61Q17/04

  Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations · CPC title

• A61K2800/412

  Microsized, i.e. having sizes between 0.1 and 100 microns · CPC title

• C09C2200/301

  Thickness of the core · CPC title

• A61K8/0229

  Sticks · CPC title