# US 9,434,819 B2 · Hydrophilized silicone particles and making method

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- Number: US 9,434,819 B2
- Document ID: US9434819B2
- Status: Granted
- Kind: B2
- Application number: 14/649,035
- Filed: 2013-01-03
- Published: 2015-11-19
- Granted: 2016-09-06
- Earliest claimed: 2013-01-03
- Assignees: Shin-Etsu Chemical Co., Ltd.
- Applicants: Shin-Etsu Chemical Co., Ltd.
- Inventors: Yoshinori Inokuchi; Mamoru Hagiwara; Naoki Omura
- Web page: https://patentgrep.com/patent/US9434819B2

## CPC

- C08G 77/38: Polysiloxanes modified by chemical after-treatment
- C08J 3/28: Treatment by wave energy or particle radiation
- C08J 7/18: using wave energy or particle radiation
- C08G 77/04: Polysiloxanes
- C08G 77/50: by carbon linkages
- C08J 2383/02: Polysilicates
- C08J 2383/04: Polysiloxanes
- Y10T 428/2995: Silane, siloxane or silicone coating
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Surfaces of silicone particles are hydrophilized by plasma treatment. The hydrophilized silicone particles are readily dispersible in aqueous materials without a need for dispersants, typically surfactants. In aqueous cosmetic applications externally applied to the skin such as skin care cosmetics, make-up cosmetics, antiperspirant cosmetics, and UV care cosmetics, for example, products free of skin irritation concern can be formulated because formulation is possible without a need for surfactants.

## Claims

### Claim 1

A uniform water dispersion of silicone particles made hydrophilic at their surfaces by plasma treatment; wherein the particles are not re-dispersible in water after the water has been removed from said dispersion.

### Claim 2 (depends on 1)

The water dispersion of silicone particles of claim 1 wherein silicone particles to by hydrophilized are polyorganosilsesquioxane particles or silicone rubber particles surface coated with polyorganosilsesquioxane.

### Claim 3

A method for preparing hydrophilic silicone particles comprising plasma treating surfaces of hydrophobic silicone particles, wherein surfaces of hydrophobic silicone particles are hydrophilized by subjecting them to plasma polymerization treatment using a hydrocarbon gas, an oxygen-containing gas and optionally, a rare gas.

### Claim 4 (depends on 3)

The method of claim 3 wherein the hydrophobic silicone particles are fed into a plasma polymerization reactor, the reactor is pumped to a pressure equal to or less than 0.5 Pa, a hydrocarbon gas, an oxygen-containing gas and optionally, a rare gas are fed into the reactor, and plasma polymerization treatment is effected under a pressure of 3 to 10 Pa.

### Claim 5 (depends on 3)

The method of claim 3 wherein the hydrophobic silicone particles are polyorganosilsesquioxane particles or silicone rubber particles surface coated with polyorganosilsesquioxane.

### Claim 6 (depends on 3)

The method of claim 3 wherein the silicone particles as plasma treated are optionally exposed to a water vapor atmosphere and admitted to and dispersed in water.

### Claim 7 (depends on 4)

The method of claim 4 wherein the silicone particles as plasma treated are optionally exposed to a water vapor atmosphere and admitted to and dispersed in water.

### Claim 8 (depends on 5)

The method of claim 5 wherein the silicone particles as plasma treated are optionally exposed to a water vapor atmosphere and admitted to and dispersed in water.

### Claim 9

A cosmetic composition comprising a uniform water dispersion of silicone particles made hydrophilic at their surfaces by plasma treatment; wherein the particles are not re-dispersible in water after the water has been removed from said dispersion.