# US 11,077,048 B2 · Oil-in-water emulsion cosmetic

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- Number: US 11,077,048 B2
- Document ID: US11077048B2
- Status: Granted
- Kind: B2
- Application number: 16/773,142
- Filed: 2020-01-27
- Published: 2020-05-21
- Granted: 2021-08-03
- Earliest claimed: 2020-01-27
- Assignees: Shiseido Company, Ltd.
- Applicants: Shiseido Company, Ltd.
- Inventors: Mayuri Tashiro; Yuko Nagare; Takashi Matsui
- Web page: https://patentgrep.com/patent/US11077048B2

## CPC

- A61K 8/731: {Cellulose; Quaternized cellulose derivatives}
- A61K 8/062: {Oil-in-water emulsions}
- A61K 8/25: Silicon; Compounds thereof
- A61K 8/27: Zinc; Compounds thereof
- A61K 8/29: Titanium; Compounds thereof
- A61K 8/37: Esters of carboxylic acids
- A61K 8/375: {the alcohol moiety containing more than one hydroxy group}
- A61K 8/41: Amines
- A61K 8/4966: {Triazines or their condensed derivatives}
- A61K 8/8158: {Homopolymers or copolymers of amides or imides, e.g. (meth) acrylamide; Compositions of derivatives of such polymers}
- A61K 8/88: Polyamides
- A61Q 17/04: Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
- A61K 2800/48: Thickener, Thickening system
- A61K 2800/621: by inorganic compounds
- A61K 2800/624: by macromolecular 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 has the purpose of providing an oil-in-water emulsion cosmetic that contains a high quantity of an ultraviolet absorbing agent and an ultraviolet scattering agent in the oil phase and achieves a high SPF, while simultaneously having a Distinctive fresh feeling in use when applied to the skin. The present invention provides an oil-in-water emulsion cosmetic characterized by comprising (A) 0.05 to 1% by mass of a hydrophobically modified alkyl cellulose; (B) 5 to 40% by mass of an oil component; (C) 2.5 to 30% by mass of an ultraviolet scattering agent having a hydrophobic surface; and (D) a water phase thickener having low salinity tolerance; wherein the (C) ultraviolet scattering agent is dispersed in the oil phase.

## Claims

### Claim 1

A method of making an oil-in-water emulsion that provides a fresh feeling upon application to skin resulting from a sudden loss of viscosity upon application to the skin,
the method comprising emulsifying
(a) 5 to 40% by mass of an oil component, wherein the oil component comprises a combination of a polar oil and a non-polar oil, wherein at least 55% by mass of the oil component is constituted by the polar oil;
(b) 0.05 to 1% by mass of an emulsifier wherein the emulsifier is a hydrophobically modified alkyl cellulose;
(c) 3.0 to 30% by mass of an ultraviolet scattering agent having a hydrophobic surface, wherein the ultraviolet scattering agent is dispersed in the oil component; and
(d) 0.15 to 1% by mass of a water phase thickener selected from the group consisting of polyvinyl alcohol, polyvinyl acetate, polyvinyl methyl ether, polyvinyl pyrrolidone, copolymers of vinyl pyrrolidone and vinyl acetate, carboxyvinyl polymers, sodium polyacrylate, poly ethyl acrylate, alkanolamine polyacrylate, copolymers of alkyl methacrylate and dimethylaminoethyl methacrylate, poly-2-acrylamido-2-methylpropane sulfonic acid, polymethacryloyloxy trimethylammonium, (ammonium acryloyldimethyl taurate/VP) copolymers, and (dimethylacrylamide/sodium acryloyldimethyl taurate) crosspolymers;
wherein if the oil-in-water emulsion comprises additional emulsifiers other than the hydrophobically modified alkyl cellulose, the additional emulsifiers are used in an amount of 1% by mass or less.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the hydrophobically modified alkyl cellulose is hydrophobic hydroxypropyl methylcellulose.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the water phase thickener is a thickener that forms a water-swellable microgel in the water phase.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the emulsion is a sunscreen cosmetic.