# US 11,298,302 B2 · Water-in-oil type emulsion cosmetic

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- Number: US 11,298,302 B2
- Document ID: US11298302B2
- Status: Granted
- Kind: B2
- Application number: 16/338,145
- Filed: 2016-09-30
- Published: 2019-09-05
- Granted: 2022-04-12
- Earliest claimed: 2016-09-30
- Assignees: Shiseido Company, Ltd.
- Applicants: Shiseido Company, Ltd.
- Inventors: Shoji Tajima; Tomoko Ikeda
- Web page: https://patentgrep.com/patent/US11298302B2

## CPC

- A61K 8/064: {Water-in-oil emulsions, e.g. Water-in-silicone emulsions}
- A61K 8/29: Titanium; Compounds thereof
- A61K 8/73: Polysaccharides
- A61K 8/732: {Starch; Amylose; Amylopectin; Derivatives thereof}
- A61K 8/8152: {Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers}
- A61K 8/891: saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
- A61K 8/896: containing atoms other than silicon, carbon, oxygen and hydrogen, e.g. dimethicone copolyol phosphate
- A61Q 1/02: Preparations containing skin colorants, e.g. pigments (preparations in powder form A61Q1/12)
- A61Q 1/12: Face or body powders for grooming, adorning or absorbing
- A61K 2800/43: Pigments; Dyes
- A61K 2800/612: By organic compounds
- A61K 2800/651: The particulate/core comprising inorganic material
- 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

## Abstract

The present invention provides a water-in-oil type emulsion cosmetic which has a fresh and smooth feeling to the touch; forms a uniform coating film once applied; can make skin unevenness such as pores look less prominent while covering discolorations such as age spots and freckles; and does not give an impression of thick application. The water-in-oil emulsion cosmetic is characterized by including (A) 0.1-10% by mass of a pigment-grade titanium dioxide and (B) 0.01-2% by mass of sodium acrylate grafted starch. It is preferred that this cosmetic further includes (C) spherical particles and/or (D) a silicone elastomer.

## Claims

### Claim 1

A water-in-oil emulsion cosmetic, comprising:
(A) 2 to 8% by mass of a pigment-grade titanium dioxide having an average particle diameter of 200 nm to 1 μm;
(B) 0.01 to 2% by mass of a sodium polyacrylate starch;
(C) 2 to 10% by mass of a spherical powder; and
(D) 1 to 10% by mass of a silicone elastomer;
wherein said (D) silicone elastomer comprises at least one silicone elastomer capable of emulsifying the composition and selected from the group consisting of PEG-10 dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, lauryl PEG-9 polydimethylsiloxyethyl dimethicone, and lauryl PEG-15 polydimethylsiloxyethyl dimethicone, (dimethicone/(PEG-10/15)) crosspolymer and (dimethicone/polyglycerol-3) crosspolymer.

### Claim 2 (depends on 1)

The water-in-oil emulsion cosmetic according to claim 1, wherein: said spherical powder (C) is at least one selected from the group consisting of a spherical silicone powder, a spherical silica powder, a nylon spherical powder, a urethane spherical powder, a polymethyl methacrylate spherical powder, a polyethylene spherical powder, and a polypropylene spherical powder.