# US 11,298,299 B2 · Method for preparing oil-in-water type emulsion composition, and cosmetic material

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- Number: US 11,298,299 B2
- Document ID: US11298299B2
- Status: Granted
- Kind: B2
- Application number: 16/647,357
- Filed: 2018-09-07
- Published: 2021-05-27
- Granted: 2022-04-12
- Earliest claimed: 2017-09-14
- Assignees: Shin-Etsu Chemical Co., Ltd.
- Applicants: Shin-Etsu Chemical Co., Ltd.
- Inventors: Yuko Takada
- Web page: https://patentgrep.com/patent/US11298299B2

## CPC

- A61K 8/06: Emulsions
- A61K 8/062: {Oil-in-water emulsions}
- A61K 8/31: Hydrocarbons
- A61K 8/86: Polyethers
- A61K 8/891: saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
- A61K 8/893: modified by an alkoxy or aryloxy group, e.g. behenoxy dimethicone or stearoxy dimethicone
- A61K 8/895: containing silicon bound to unsaturated aliphatic groups, e.g. vinyl dimethicone
- A61K 8/91: Graft copolymers (A61K8/89 takes precedence)
- A61Q 1/00: Make-up preparations; Body powders; Preparations for removing make-up
- A61Q 1/04: for lips
- A61Q 19/00: Preparations for care of the skin
- A61K 2800/21: Emulsions characterized by droplet sizes below 1 micron
- A61Q 1/06: Lipsticks
- A61Q 1/10: for eyes, e.g. eyeliner, mascara
- 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

Provided is a method for preparing an oil-in-water type emulsion composition, the method comprising a step for stirring and emulsifying a composition containing components (A), (B), (C) and (D) below and then treating under a high shear pressure of 30-300 Mpa, wherein (A) is 5-35 mass % of an acrylic-silicone graft copolymer, (B) is 5-35 mass % of volatile oil, (C) is 2-15 mass % of polyoxyethylene sorbitan fatty acid ester having average addition mole number of ethylene oxide (EO) of 10 or more and HLB of 11 or more, and (D) is 15-88 mass % of water.

## Claims

### Claim 1

A method for producing an oil-in-water emulsion composition, comprising the steps of:
agitating and thereby emulsifying a composition containing:
(A) from 5 to 35 wt % of an acrylic-silicone graft copolymer which has a weight-average molecular weight of 3,000 to 100,000 and contains constituent units (1) and (2) of the following general formulas
wherein each R1 is a group independently selected from monovalent hydrocarbon groups, R2 is an alkyleneoxycarbonyl group of 2 to 11 carbon atoms, the alkylene group being limited to a structure that bonds with a silicon atom, R3 and R4 are each independently a hydrogen atom or a methyl group, R5 is an alkyl group of 1 to 22 carbon atoms or a hydrogen atom, m is an integer from 3 to 500, and the molar ratio between the constituent units having general formulas (1) and (2), expressed as (1)/(2), is from 0.02 to 1,
(B) from 5 to 35 wt % of a volatile oil,
(C) from 2 to 15 wt % of a polyoxyethylene sorbitan fatty acid ester having an average number of moles of added ethylene oxide (EO) of at least 10 and a hydrophilic-lipophilic balance (HLB) of at least 11, and
(D) from 15 to 88 wt % of water; and
subsequently treating the emulsified composition under a high shear pressure of from 30 to 300 MPa.

### Claim 2 (depends on 1)

The method for producing an oil-in-water emulsion composition of claim 1, wherein component (C) is one or more selected from the group consisting of polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate and polyoxyethylene sorbitan monopalmitate.

### Claim 3 (depends on 1)

The method for producing an oil-in-water emulsion composition of claim 1, wherein emulsion particles in the oil-in-water emulsion composition have an average particle size of 300 nm or less.

### Claim 4 (depends on 1)

The method for producing an oil-in-water emulsion composition of claim 1, wherein component (B) is a volatile oil selected from the group consisting of silicone oils having a viscosity at 25′C of 0.2 mm2/s or less and hydrocarbon oils.

### Claim 5 (depends on 1)

The method for producing an oil-in-water emulsion composition of claim 1, further comprising the step of including (E) a water-soluble polymer compound in an amount, based on the combined amount of components (A) and (B), of from 0.1 to 5 wt %.

### Claim 6 (depends on 1)

A cosmetic preparation comprising the oil-in-water emulsion composition obtained by the production method of claim 1.