# US 9,433,565 B2 · Hydrophilic and highly oil absorbent boron nitride powder, method for manufacturing the same, and cosmetic

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- Number: US 9,433,565 B2
- Document ID: US9433565B2
- Status: Granted
- Kind: B2
- Application number: 14/429,451
- Filed: 2013-08-27
- Published: 2015-07-30
- Granted: 2016-09-06
- Earliest claimed: 2012-09-28
- Assignees: Mizushima Ferroalloy Co., Ltd.
- Applicants: Mizushima Ferroalloy Co., Ltd.
- Inventors: Takahisa Koshida; Masato Kumagai; Shoichi Hiwasa
- Web page: https://patentgrep.com/patent/US9433565B2

## CPC

- A61K 8/19: containing inorganic ingredients
- A61K 8/022: {Powders; Compacted Powders}
- A61K 8/0245: {Specific shapes or structures not provided for by any of the groups of A61K8/0241}
- A61Q 1/02: Preparations containing skin colorants, e.g. pigments (preparations in powder form A61Q1/12)
- C01B 21/064: with boron
- C01B 21/0648: {After-treatment, e.g. grinding, purification (transformation of hexagonal into cubic or wurtzitic boron nitride C04B35/5831)}
- A61K 2800/412: Microsized, i.e. having sizes between 0.1 and 100 microns
- A61K 2800/651: The particulate/core comprising inorganic material
- C01P 2004/20: extending in two dimensions, e.g. plate-like
- C01P 2004/50: Agglomerated particles
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/12: Surface area
- C01P 2006/19: Oil-absorption capacity, e.g. DBP values
- C01P 2006/80: Compositional purity
- C01P 2006/90: Other properties not specified above
- Y10T 428/2982: Particulate matter [e.g., sphere, flake, etc.]
- 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
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A boron nitride powder including flat-shaped primary particles of BN and an aggregate of the primary particles has a water permeation speed not less than 1 mm2/s and oil absorption of 100 ml/100 g to 500 ml/100 g, which is a cosmetic boron nitride powder with high hydrophilicity and high oil absorbency. The use of such a boron nitride powder provides a cosmetic that is significantly improved not only in gloss finish and transparency (bare skin feeling) but also in sustainability.

## Claims

### Claim 1

A hydrophilic and highly oil absorbent boron nitride powder, washed in a liquid that contains surfactant, comprising flat-shaped primary particles of BN and an aggregate of the primary particles,
wherein a water permeation speed is not less than 1 mm2/s, and oil absorption is 100 ml/100 g to 500 ml/100 g.

### Claim 2 (depends on 1)

The hydrophilic and highly oil absorbent boron nitride powder according to claim 1,
wherein the primary particles of BN are flat-shaped with an average major diameter of 2 μm to 20 μm and a thickness of 0.05 μm to 0.5 μm.

### Claim 3 (depends on 1)

The hydrophilic and highly oil absorbent boron nitride powder according to claim 1,
wherein an amount of soluble boron is less than or equal to 100 ppm.

### Claim 4 (depends on 2)

The hydrophilic and highly oil absorbent boron nitride powder according to claim 2,
wherein a specific surface area is 1 m2/g to 10 m2/g, and an oxygen content is less than or equal to 1.5 mass %.

### Claim 5

A method for manufacturing a hydrophilic and highly oil absorbent boron nitride powder, the method comprising:
heating at least one of boric acid and a dehydration product thereof, at least one of urea and a compound thereof, and boron carbide in an inert atmosphere to obtain a boron nitride powder having a turbostratic structure;
heat-treating the obtained boron nitride powder at a temperature of 1500° C. to 2300° C. in an inert atmosphere;
grinding the heat-treated boron nitride powder; and
washing primary particles of boron nitride obtained as a result of the grinding in a washing liquid that contains a surfactant, and drying the washed primary particles.

### Claim 6 (depends on 1)

A cosmetic comprising the boron nitride powder according to claim 1.

### Claim 7 (depends on 6)

The cosmetic according to claim 6,
wherein an amount of the boron nitride powder contained in the cosmetic is 0.1 mass % to 70 mass %.

### Claim 8 (depends on 6)

The cosmetic according to claim 6,
wherein the cosmetic is liquid foundation.