SPHERICAL POLYESTER RESIN PARTICLES AND METHOD FOR PRODUCING SAME

• US 20200131306A1
• Filed: 03/20/2018
• Published: 04/30/2020
• Est. Priority Date: 03/31/2017
• Status: Active Grant

• Current Assignee: Sekisui Kasei Co., Ltd.
• Original Assignee: Sekisui Plastics Company Limited
• Inventors: HARADA, Ryosuke
• Granted Patent: US 11,332,572 B2
• Time in Patent Office: Days
• CPC Class Codes: A61K 2800/10 General cosmetic use
• CPC Class Codes: A61K 2800/262 Transparent; Translucent
• CPC Class Codes: A61K 2800/28 Rubbing or scrubbing compositions; Peeling or abrasive compositions; Containing exfoliants
• CPC Class Codes: A61K 2800/654 The particulate/core comprising macromolecular material
• CPC Class Codes: A61K 8/025 Explicitly spheroidal or spherical shape
• CPC Class Codes: A61K 8/04 Dispersions; Emulsions
• CPC Class Codes: A61K 8/85 Polyesters
• CPC Class Codes: A61Q 19/00 Preparations for care of the skin
• CPC Class Codes: C08G 63/16 Dicarboxylic acids and dihydroxy compounds
• CPC Class Codes: C08G 63/88 Post-polymerisation treatment
• CPC Class Codes: C08J 2367/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds; C08J2367/06 takes precedence
• CPC Class Codes: C08J 2433/04 esters
• CPC Class Codes: C08J 3/12 Powdering or granulating
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08L 2201/10 Transparent films; Clear coatings; Transparent materials
• CPC Class Codes: C08L 2201/56 Non-aqueous solutions or dispersions
• CPC Class Codes: C08L 2203/16 used for films
• CPC Class Codes: C08L 2205/18 Spheres
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: C09D 167/02 : Polyesters derived from dicarboxylic acids and dihydroxy compounds C09D167/06 takes precedence
• CPC Class Codes: C09D 7/65 : macromolecular C09D7/41-C09D7/48 take precedence
• CPC Class Codes: G02B 1/04 : made of organic materials, e.g. plastics G02B1/08 takes precedence

Abstract

Spherical polyester-based resin particles characterized in that the spherical polyester-based resin particles contain a polyester-based resin and have a crystallinity of 20% or less and an average circularity of 0.96 or more. The spherical polyester-based resin particles according to the present invention can provide suitable resin particles as compounding agents for cosmetics such as foundation, antiperspirants, and skin scrubs; various agents such as matte coating agents for paints, rheology modifying agents, antiblocking agents, slipperiness-imparting agents, light diffusion agents, electroconductive agents, and diagnostic testing agents for medical use; and additives to molded articles such as automobile materials and construction materials.

Claims

1. Spherical polyester-based resin particles wherein the spherical polyester-based resin particles comprise a polyester-based resin and have a crystallinity of 20% or less and an average circularity of 0.96 or more.

2. The spherical polyester-based resin particles according to claim 1, wherein the mass loss ratio after heating at 200°

C. for two hours is 3% or less.

3. The spherical polyester-based resin particles according to claim 1, wherein the polyester-based resin is a polyethylene terephthalate or a polybutylene terephthalate.

4. The spherical polyester-based resin particles according to claim 1, wherein the proportion of the particles having a circularity of 0.90 or less is 10% by number or less.

5. The spherical polyester-based resin particles according to claim 1, wherein the spherical polyester-based resin particles are compounding agents for optical films.

6. The spherical polyester-based resin particles according to claim 1, wherein the spherical polyester-based resin particles are compounding agents for paints.

7. The spherical polyester-based resin particles according to claim 1, wherein the spherical polyester-based resin particles are compounding agents for cosmetics.

8. A method for producing spherical polyester-based resin particles as defined in claim 1, comprising

melting polyester-based raw material resin particles having an intrinsic viscosity of 0.6 dl/g or less at a temperature higher than a melting point of the particles by 80°

C. or more to form into spheres, and

cooling the particles after formation into spheres at a temperature equal to or lower than the melting point to solidify.

9. A dispersion wherein the dispersion comprises spherical polyester-based resin particles as defined in claim 1 and a binder, wherein the spherical polyester-based resin particles are dispersed as dispersed particles in the binder.

10. An optical film wherein the optical film comprises spherical polyester-based resin particles as defined in claim 1.

11. Cosmetics wherein the cosmetics comprise spherical polyester-based resin particles as defined in claim 1.