# US 8,784,556 B2 · Angle-dependent interference pigments

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- Number: US 8,784,556 B2
- Document ID: US8784556B2
- Status: Granted
- Kind: B2
- Application number: 12/994,759
- Filed: 2010-02-24
- Published: 2011-12-15
- Granted: 2014-07-22
- Earliest claimed: 2010-02-24
- Assignees: Shantou Longhua Pearl Lustre Pigments Co., Ltd
- Applicants: Weizhong Liu; Yulin Zhuang
- Inventors: Weizhong Liu; Yulin Zhuang
- Web page: https://patentgrep.com/patent/US8784556B2

## CPC

- C03C 17/3417: {all coatings being oxide coatings}
- A61K 8/0266: {Characterized by the sequence of layers}
- A61K 8/25: Silicon; Compounds thereof
- A61K 8/26: Aluminium; Compounds thereof
- A61K 8/29: Titanium; Compounds thereof
- A61Q 19/00: Preparations for care of the skin
- C04B 35/62807: {Silica or silicates}
- C04B 35/6281: {Alkaline earth metal oxides}
- C04B 35/62813: {Alumina or aluminates}
- C04B 35/62821: {Titanium oxide}
- C04B 35/62826: {Iron group metal oxides}
- C04B 35/62886: {by wet chemical techniques}
- C04B 35/62894: {with more than one coating layer}
- 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}
- C09C 1/0039: {consisting of at least one coloured inorganic material}
- C09D 5/36: Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre
- C09D 7/62: modified by treatment with other compounds
- A61K 2800/10: General cosmetic use
- A61K 2800/436: Interference pigments, e.g. Iridescent, Pearlescent
- C01P 2002/85: by XPS, EDX or EDAX data
- C01P 2004/03: obtained by SEM
- C03C 2217/734: comprising an alternation of high and low refractive indexes
- C04B 2235/3454: Calcium silicates, e.g. wollastonite
- C04B 2235/3481: Alkaline earth metal alumino-silicates other than clay, e.g. cordierite, beryl, micas such as margarite, plagioclase feldspars such as anorthite, zeolites such as chabazite
- C04B 2235/36: Glass starting materials for making ceramics, e.g. silica glass
- C04B 2235/5292: Flakes, platelets or plates
- C04B 2235/5436: micrometer sized, i.e. from 1 to 100 micron
- C04B 2235/9661: Colour
- C09C 2200/102: the core consisting of glass or silicate material like mica or clays, e.g. kaolin
- C09C 2200/302: Thickness of a layer with high refractive material
- C09C 2200/303: Thickness of a layer with low refractive material
- C09C 2200/401: Inorganic protective coating
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- 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
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- 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}
- 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

An angle-dependent interference pigment based on transparent or translucent inorganic flake serving as a substrate is provided. The substrate is coated by coatings (A)+(B)+(C) and optionally coating (D), so as to form a “high-low-high” refractive index layered structure. The coatings (A) and (C) consist of metal oxides, silicate, aluminates and/or a mixture thereof. The coating (B) consist of silicon oxide, hydrous silicon oxide, aluminum oxide, hydrous aluminum oxide, magnesium oxide, hydrous magnesium oxide and/or a mixture thereof. The angle-dependent interference pigments have high color saturation in the transitional region and a significantly gradual color change in the color changing region. The present pigments can be used as colored coatings, including printing ink, or can be used in the preparation of plastics, glass, ceramics and the like. The pigment of the present invention is particularly used in the cosmetic industry which has a very high requirement on gradual color change.

## Claims

### Claim 1

An angle-dependent interference pigment based on transparent or translucent inorganic flake serving as a substrate, the substrate being coated by at least one layer packet comprising in sequence by:
(A) a coating having high refractive index,
(B) a colorless coating having a refractive index n≦1.8,
(C) a coating having high refractive index, and optionally,
(D) an outer protective layer;
wherein the coating (B) is always between coating (A) and coating (C) so as to form a “high-low-high” refractive index layered structure, the “high-low-high” refractive index layered structure having an odd number of layers with the odd number being 3 or more; the coatings (A) and (C) consisting of metal oxides and silicate, and the silicate has its highest content at the interface between the coating with high refractive index and the coating with low refractive index and less content far from the interface; the coating (B) consisting of silicon oxide, hydrous silicon oxide, aluminum oxide, hydrous aluminum oxide, magnesium oxide, hydrous magnesium oxide and/or a mixture thereof.

### Claim 2 (depends on 1)

The angle-dependent interference pigment of claim 1, wherein:
the coating (B) consisting of silicon oxide or a mixture of silicon oxide and hydrous silicon oxide.

### Claim 3 (depends on 1)

The angle-dependent interference pigment of claim 1, wherein:
the thickness of the coating (B) is in the range of 20-1000 nm and preferably 50-900 nm.

### Claim 4 (depends on 1)

The angle-dependent interference pigment of claim 1, wherein:
the thickness of the coatings (A) and (C) is respectively in the range of 5-165 nm and preferably 10-150 nm.

### Claim 5 (depends on 1)

The angle-dependent interference pigment of claim 1, wherein:
the protective layer (D) consists of colorless or colored metal oxides, metal oxides hydroxides, nonmetal oxides, nonmetal oxides hydroxides and/or phosphates.

### Claim 6 (depends on 1)

A coating which comprises a pigment according to the angle-dependent interference pigment of claim 1.

### Claim 7 (depends on 1)

A paint which comprises a pigment according to the angle-dependent interference pigment of claim 1.

### Claim 8 (depends on 1)

An ink which comprises a pigment according to the angle-dependent interference pigment of claim 1.

### Claim 9 (depends on 1)

A plastic which comprises a pigment according to the angle-dependent interference pigment of claim 1.

### Claim 10 (depends on 1)

A glass which comprises a pigment according to the angle-dependent interference pigment of claim 1.

### Claim 11 (depends on 1)

A ceramic which comprises a pigment according to the angle-dependent interference pigment of claim 1.

### Claim 12 (depends on 1)

A cosmetic which comprises a pigment according to the angle-dependent interference pigment of claim 1.