# US 11,299,636 B2 · Effect pigments based on artificially produced substrates with a narrow size distribution

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- Number: US 11,299,636 B2
- Document ID: US11299636B2
- Status: Granted
- Kind: B2
- Application number: 12/864,146
- Filed: 2008-11-25
- Published: 2010-11-25
- Granted: 2022-04-12
- Earliest claimed: 2008-02-20
- Assignees: Eckart GmbH
- Applicants: Günter Kaupp; Ulrich Schmidt; Dirk Schumacher; Ralph Schneider
- Inventors: Günter Kaupp; Ulrich Schmidt; Dirk Schumacher; Ralph Schneider
- Web page: https://patentgrep.com/patent/US11299636B2

## CPC

- C09C 1/0015: {Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings}
- A61K 8/0229: {Sticks}
- A61K 8/0266: {Characterized by the sequence of layers}
- A61K 8/19: containing inorganic ingredients
- A61K 8/25: Silicon; Compounds thereof
- A61Q 1/02: Preparations containing skin colorants, e.g. pigments (preparations in powder form A61Q1/12)
- C08K 9/02: Ingredients treated with inorganic substances
- C09C 1/0018: {uncoated and unlayered plate-like particles}
- C09C 1/0021: {comprising a core coated with only one layer having a high or low refractive index}
- C09C 1/0024: {comprising a stack of coating layers with alternating high and low refractive indices, wherein the first coating layer on the core surface has the high refractive index}
- C09D 5/36: Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre
- A61K 2800/412: Microsized, i.e. having sizes between 0.1 and 100 microns
- A61K 2800/436: Interference pigments, e.g. Iridescent, Pearlescent
- A61K 2800/621: by inorganic compounds
- A61K 2800/651: The particulate/core comprising inorganic material
- A61Q 1/04: for lips
- A61Q 1/06: Lipsticks
- A61Q 1/08: for cheeks, e.g. rouge
- A61Q 1/10: for eyes, e.g. eyeliner, mascara
- A61Q 1/12: Face or body powders for grooming, adorning or absorbing
- A61Q 3/02: Nail coatings
- A61Q 13/00: Formulations or additives for perfume preparations (essential oils or perfumes per se C11B9/00)
- A61Q 17/04: Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
- A61Q 19/00: Preparations for care of the skin
- A61Q 19/10: Washing or bathing preparations
- C01P 2004/51: Particles with a specific particle size distribution
- C09C 2200/1004: the core comprising at least one inorganic oxide, e.g. Al2O3, TiO2 or SiO2
- C09C 2200/102: the core consisting of glass or silicate material like mica or clays, e.g. kaolin
- C09C 2200/1062: the core consisting of an organic compound, e.g. Liquid Crystal Polymers [LCP], Polymers or natural pearl essence
- C09C 2200/1087: the core consisting of bismuth oxychloride, magnesium fluoride, nitrides, carbides, borides, lead carbonate, barium or calcium sulfate, zinc sulphide, molybdenum disulphide or graphite
- C09C 2200/301: Thickness of the core
- C09C 2200/304: Thickness of intermediate layers adjacent to the core, e.g. metallic layers, protective layers, rutilisation enhancing layers or reflective layers
- C09C 2220/10: Wet methods, e.g. co-precipitation
- C09C 2220/106: comprising only a drying or calcination step of the finally coated pigment
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## 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.

## Claims

### Claim 1

Effect pigments consisting essentially of artificial platelet-shaped substrates which have only one optically active coating comprising TiO2 in the rutile or anatase crystal polymorph, wherein in case of the rutile polymorph, the coating is obtained by a process comprising applying SnO2 to the substrates, applying TiO2 to the applied SnO2, and then calcining the substrates, wherein 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, 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, SiO2 platelets, platelet-shaped bismuth oxychloride, platelet-shaped aluminum oxides, and mixtures thereof.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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

### Claim 4

Effect pigments consisting essentially of glass platelet-shaped substrates which have only one optically active coating comprising TiO2 in the rutile or anatase crystal polymorph, wherein in case of the rutile polymorph, the coating is obtained by a process comprising applying SnO2 to the substrates, applying TiO2 to the applied SnO2, and then calcining the substrates, wherein 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 platelet-shaped substrates being 500 nm to 2000 nm.

### Claim 5 (depends on 4)

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

### Claim 6 (depends on 4)

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

### Claim 7 (depends on 4)

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

### Claim 8 (depends on 4)

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%.

### Claim 9 (depends on 4)

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.

### Claim 10 (depends on 1)

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%.

### Claim 11 (depends on 1)

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%.

### Claim 12 (depends on 1)

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.

### Claim 13 (depends on 1)

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.

### Claim 14 (depends on 4)

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%.