Aromatic polyester particles and method for producing aromatic polyester particles

Patent metadata

Field	Value
Publication number	US-11198758-B2
Application number	US-201816621208-A
Country	US
Kind code	B2
Filing date	Jun 11, 2018
Priority date	Jun 13, 2017
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

Aromatic polyester particles which are formed from an aromatic polyester having a flow starting temperature of 400° C. or higher and have a circularity of a projected image of 0.80 or more and 1.00 or less.

First claim

The invention claimed is:

1. Aromatic polyester particles which are formed from an aromatic polyester having a flow starting temperature of 400° C. or higher and have a circularity of a projected image of 0.80 or more and 1.00 or less.

2. The aromatic polyester particles according to claim 1 ,
wherein said aromatic polyester is composed of a repeating unit represented by the following formula (1):
—O—Ar 1 —CO—  (1)

(Ar 1 represents a 1,4-phenylene group, a 2,6-naphthylene group, or a 4,4′-biphenylene group),
wherein the repeating unit is contained in an amount of 90 mol % or more and 100 mol % or less with respect to all repeating units constituting the aromatic polyester.

3. The aromatic polyester particles according to claim 1 , wherein a volume average particle diameter is 30 μm or more and 100 μm or less.

4. A method for producing aromatic polyester particles according to claim 1 ,
the method comprising:
producing a lumpy material of an aromatic polyester;
pulverizing said lumpy material;
spheroidizing amorphous particles obtained by pulverizing said lumpy material by a mechanical treatment; and
subjecting said spheroidized particles to solid phase polymerization.

5. The method for producing aromatic polyester particles according to claim 4 , wherein said mechanical treatment is a compression shear treatment using a dry attrition mill.

6. The method for producing aromatic polyester particles according to claim 4 , wherein in pulverization of said lumpy material, said lumpy material is pulverized so that a volume average particle diameter of said amorphous particles is 30 μm or more and 100 μm or less.

Assignees

• Sumitomo Chemical Co

Inventors

• Ito Kazuyuki
• Sato Tomohiro
• Saitou Yuzuru

Classifications

• B29B2009/166

  Deforming granules to give a special form, e.g. spheroidizing, rounding · CPC title

• C08G63/065 Primary

  the hydroxy and carboxylic ester groups being bound to aromatic rings · CPC title

• C08J3/12

  Powdering or granulating · CPC title

• C08J2367/02

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

• B29B9/12

  characterised by structure or composition · CPC title