Polyester-based resin particles, process for producing same, and use thereof

Patent metadata

Field	Value
Publication number	US-10501586-B2
Application number	US-201615746153-A
Country	US
Kind code	B2
Filing date	Aug 18, 2016
Priority date	Sep 28, 2015
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

Polyester-based resin particles including a polyester-based resin as a base resin, in which the base resin exhibits a plurality of endothermic peaks corresponding to crystal melting temperatures by DSC measurement, at least one of the endothermic peaks exists in each region of a low temperature side region and a high temperature side region, a maximum endothermic peak of the low temperature side region and a maximum endothermic peak of the high temperature side region exhibit a crystal melting heat amount ratio (low temperature side crystal melting heat amount/high temperature side crystal melting heat amount) in a range of 0.1 to 1.5, and the polyester-based resin particles have a volume average particle diameter of 1 to 50 μm.

First claim

What is claimed is:

1. Polyester-based resin particles comprising a polyester-based resin as a base resin,
wherein
said base resin exhibits a plurality of endothermic peaks corresponding to crystal melting temperatures by DSC measurement,
at least one of said endothermic peaks exists in each region of a low temperature side region and a high temperature side region,
a maximum endothermic peak of said low temperature side region and a maximum endothermic peak of said high temperature side region exhibit a crystal melting heat amount ratio (low temperature side crystal melting heat amount/high temperature side crystal melting heat amount) in a range of 0.1 to 1.5, said polyester-based resin particles have a volume average particle diameter of 1 to 50 μm, and said polyester-based resin particles have a crystallization degree of 30 to 50% and do not contain thread-like particles.

2. The polyester-based resin particles according to claim 1 , wherein said polyester-based resin is polyethylene terephthalate.

3. The polyester-based resin particles according to claim 1 , wherein the maximum endothermic peak of said low temperature side region exhibits a maximum peak value at a range of 230° C. or higher and lower than 250° C., and the maximum endothermic peak of said high temperature side region exhibits a maximum peak value at a range of higher than 250° C. and 260° C. or lower.

4. The polyester-based resin particles according to claim 1 , wherein the maximum endothermic peak of said low temperature side region exhibits a crystal melting heat amount of 5 to 35 J/g, and the maximum endothermic peak of said high temperature side region exhibits a crystal melting heat amount of 20 to 50 J/g.

5. A method for producing the polyester-based resin particles as defined in claim 1 , comprising the steps of:
contacting a polyester-based raw material resin having an intrinsic viscosity of 0.5 to 1.3 dl/g and a crystallization degree by DSC measurement of 30 to 50%, with a glycol ether-based solvent; and
grinding a mixture after the contact,
wherein
said contact is performed under a temperature of a crystallization temperature of a polyester-based raw material resin or higher, and
said glycol ether-based solvent is 3-methoxy-3-methyl-1-butanol.

6. A coating material blending with the polyester-based resin particles as defined in claim 1 .

7. A cosmetic material blending with the polyester-based resin particles as defined in claim 1 .

Assignees

• Sekisui Plastics

Inventors

• Kusaka Akiyoshi
• Kuwagaki Kaori
• Harada Ryosuke

Classifications

• C09D7/69

  Particle size larger than 1000 nm · CPC title

• C08J3/12 Primary

  Powdering or granulating · CPC title

• A61K8/0241

  Containing particulates characterized by their shape and/or structure (see also A61K8/04, A61K8/11, and A61K8/14, further aspects are classified in A61K2800/40 and subcodes) · CPC title

• A61Q19/007

  Preparations for dry skin · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title