# US 9,040,094 B2 · Flaky particle and cosmetic

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- Number: US 9,040,094 B2
- Document ID: US9040094B2
- Status: Granted
- Kind: B2
- Application number: 14/511,925
- Filed: 2014-10-10
- Published: 2015-01-29
- Granted: 2015-05-26
- Earliest claimed: 2014-10-10
- Assignees: Sakai Chemical Industry Co., Ltd.
- Applicants: Sakai Chemical Industry Co., Ltd.
- Inventors: Keiji Ono; Takuro Ashida; Hiroyuki Izumikawa; Hirobumi Yoshida
- Web page: https://patentgrep.com/patent/US9040094B2

## CPC

- C09C 1/405: {containing combined silica, e.g. mica}
- A61K 8/02: characterised by special physical form
- A61K 8/0254: {Platelets; Flakes}
- A61K 8/19: containing inorganic ingredients
- A61K 8/23: Sulfur; Selenium; Tellurium; Compounds thereof
- A61K 8/25: Silicon; Compounds thereof
- A61K 8/26: Aluminium; Compounds thereof
- A61K 8/361: {Carboxylic acids having more than seven carbon atoms in an unbroken chain; Salts or anhydrides thereof}
- A61Q 1/02: Preparations containing skin colorants, e.g. pigments (preparations in powder form A61Q1/12)
- A61Q 19/00: Preparations for care of the skin
- B05D 1/18: performed by dipping
- C09C 1/027: {Barium sulfates}
- C09C 1/28: Compounds of silicon {(C09C1/0009, C09C1/0015, C09C1/0078 take precedence)}
- C09C 1/407: {Aluminium oxides or hydroxides}
- C09C 3/08: Treatment with low-molecular-weight {non-polymer} organic compounds {(C09C3/006, C09C3/048 take precedence)}
- A61K 2800/412: Microsized, i.e. having sizes between 0.1 and 100 microns
- A61K 2800/413: Nanosized, i.e. having sizes below 100 nm
- A61K 2800/43: Pigments; Dyes
- A61K 2800/622: by organic compounds
- A61K 2800/651: The particulate/core comprising inorganic material
- C01P 2004/20: extending in two dimensions, e.g. plate-like
- C01P 2004/54: Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- 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
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The present invention has an object to provide a flaky particulate material giving skin an excellent smoothness, which is free from whitening problem upon use thereof owing to its high transparency. The present invention also has another object to provide a cosmetic composition containing the flaky particulate material. The present invention relates to flaky particulate material, which has an average coefficient of friction is not more than 0.50, and a total light transmittance is not less than 85%. A particle in the flaky particulate material comprises a substrate particle made of one material selected from the group consisting of mica, a synthetic mica, sericite, talc, barium sulfate and aluminum oxide. The present invention provides a flaky particulate material that gives skin excellent smoothness, a natural tone, and a matt appearance. The flaky particulate material of the present invention gives a cosmetic composition which provides great comfort of use, and an excellent appearance.

## Claims

### Claim 1

A process for producing a flaky particulate material comprising substrate particles having surfaces coated with a fatty acid metal salt, the process comprising the steps of:
suspending the substrate particles in water, whereby a slurry is formed;
adding an aqueous solution of a water-soluble metal salt to the slurry in an amount sufficient to provide a fatty acid metal salt on the substrate particles in an amount of 0.1 to 15% by mass of the flaky particulate material;
adding an aqueous basic solution over a period of 30 minutes or more to basify the slurry;
adding an aqueous solution of a water-soluble fatty acid salt drop-wise to the slurry for 30 minutes or more in an amount sufficient to provide a fatty acid metal salt on the substrate particles in an amount of 0.1 to 15% by mass of the flaky particulate material; and
ageing the slurry for 30 minutes or more;
whereby the flaky particulate material comprising substrate particles having surfaces coated with the fatty acid metal salt is provided, the fatty acid metal salt being present on the substrate particles in an amount of 0.1 to 15% by mass, the flaky particulate material having an average coefficient of friction of not more than 0.50 and a total light transmittance of not less than 85%.

### Claim 2 (depends on 1)

The process according to claim 1 wherein the substrate particles are selected from particles of mica, synthetic mica, sericite, talc, barium sulfate and aluminum oxide.

### Claim 3 (depends on 1)

The process according to claim 1 wherein the flaky particulate material has a reflection-intensity ratio (0°/45°) of not less than 0.30, said ratio (0°/45°) meaning a ratio: (a reflection intensity in the condition that the light incident angle is −45° and an acceptance angle is 0°)/(a reflection intensity in the condition that the light incident angle is −45° and the acceptance angle is 45°), and said ratio being measurable by a three-dimensional variable gloss meter.

### Claim 4 (depends on 1)

The process according to claim 1, wherein the flaky particulate material has an average major axis length of 3 to 40 μm, and the ratio of the average major axis length to the average particle thickness of the flaky particulate material is 3 to 300.