# US 11,078,338 B2 · Generally spherical resin particles formed of thermoplastic resin, method for producing same and use of same

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- Number: US 11,078,338 B2
- Document ID: US11078338B2
- Status: Granted
- Kind: B2
- Application number: 16/318,808
- Filed: 2016-07-22
- Published: 2019-09-12
- Granted: 2021-08-03
- Earliest claimed: 2016-07-22
- Assignees: Sekisui Plastics Co., Ltd.
- Applicants: Sekisui Plastics Co., Ltd.
- Inventors: Kaori Kuwagaki; Akiyoshi Kusaka
- Web page: https://patentgrep.com/patent/US11078338B2

## CPC

- C08J 3/095: {Oxygen containing compounds}
- C08J 3/16: by coagulating dispersions {(C08J3/122 takes precedence)}
- A61K 8/025: {Explicitly spheroidal or spherical shape}
- A61K 8/85: Polyesters
- A61K 8/922: {of vegetable origin}
- A61Q 19/00: Preparations for care of the skin
- C08G 63/06: derived from hydroxycarboxylic acids
- C08G 63/08: Lactones or lactides
- C08G 63/16: Dicarboxylic acids and dihydroxy compounds
- C08G 63/88: Post-polymerisation treatment
- C08J 3/11: from solid polymers
- C08J 3/12: Powdering or granulating
- C08J 3/14: by precipitation from solutions {(C08J3/122 takes precedence)}
- C09D 5/031: {characterised by particle size or shape}
- C09D 167/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09D167/06 takes precedence)
- C09D 167/04: Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C09D167/06 takes precedence)
- A61K 2800/10: General cosmetic use
- A61K 2800/26: Optical properties
- A61K 2800/412: Microsized, i.e. having sizes between 0.1 and 100 microns
- C08G 2230/00: Compositions for preparing biodegradable polymers
- C08J 2300/16: Biodegradable polymers
- C08J 2367/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence)
- C08J 2367/04: Polyesters derived from hydroxy carboxylic acids, e.g. lactones (C08J2367/06 takes precedence)
- 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)
- 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
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

Generally spherical resin particles formed of a thermoplastic resin, having a sphericity of 0.90 to 1.00, a light scattering index of 0.5 to 1.0 and a linseed oil absorption of 30 to 150 mL/100 g.

## Claims

### Claim 1

Resin particles formed of a thermoplastic resin, wherein the resin particles have a sphericity of 0.90 to 1.00, a light scattering index of 0.5 to 1.0 and a linseed oil absorption of 30 to 150 mL/100 g, wherein the thermoplastic resin is at least one resin selected from the group consisting of polybutylene succinate and polyhydroxyalkanoate.

### Claim 2 (depends on 1)

The resin particles formed of a thermoplastic resin according to claim 1, wherein the thermoplastic resin is biodegradable.

### Claim 3 (depends on 1)

The resin particles formed of a thermoplastic resin according to claim 1, wherein the resin particles are used for any application of:
(i) compounding agents for cosmetics selected from foundations, antiperspirants and scrubes;
(ii) various agents selected from flatting agents for paints, rheology modifying agents, antiblocking agents, lubricity imparting agent, light diffusing agents, auxiliary agents for sinter molding of fine ceramics, fillers for adhesives and medical diagnostic examination agents; and
(iii) additives for molded articles selected from automobile materials and construction materials.

### Claim 4 (depends on 1)

The resin particles formed of a thermoplastic resin according to claim 1, wherein the resin particles have a volume average particle diameter of 1 to 500 μm and a CV of 39.1 to 57.9.

### Claim 5

A method for producing resin particles formed of a thermoplastic resin comprising emulsifying and dispersing the thermoplastic resin at a temperature of 100°C. or higher in the presence of a solvent containing 3-alkoxy-3-methyl-1-butanol and/or 3-alkoxy-3- methyl-1-butylacetate (the alkoxy group has 1 to 5 carbon atoms), water and a dispersion stabilizer followed by cooling, wherein the thermoplastic resin is at least one resin selected from the group consisting of polybutylene succinate and polyhydroxyalkanoate.

### Claim 6 (depends on 5)

The method for producing the resin particles formed of a thermoplastic resin according to claim 5, wherein the thermoplastic resin is biodegradable.

### Claim 7 (depends on 5)

The method for producing the resin particles formed of a thermoplastic resin according to claim 5, wherein the resin particles have a volume average particle diameter of 1 to 500 μm and a CV of 39.1 to 57.9.

### Claim 8 (depends on 1)

A cosmetic comprising the resin particles formed of a thermoplastic resin according to claim 1.

### Claim 9 (depends on 1)

A coating material comprising the resin particles formed of a thermoplastic resin according to claim 1.