Polyester mixture and manufacturing method for polyester

Patent metadata

Field	Value
Publication number	US-2020131308-A1
Application number	US-201916394296-A
Country	US
Kind code	A1
Filing date	Apr 25, 2019
Priority date	Oct 25, 2018
Publication date	Apr 30, 2020
Grant date	—

Abstract

esterifying the mixture to form a first polyester mixture; and polymerizing the first polyester mixture to form a second polyester mixture, in which the second polyester mixture has a diethylene glycol concentration of less than 1 wt % but greater than 0.1 wt %, based on the total weight of the second polyester mixture, and a polydispersity index of polyethylene terephthalate in the second polyester mixture is less than 3 but greater than 2.

First claim

What is claimed is:

1 . A manufacturing method of polyester, comprising:
mixing Bis(2-Hydroxyethyl) terephthalate monomer with terephthalic acid to form a mixture, wherein the diethylene terephthalate monomer is represented by formula (I) below:

esterifying the mixture to form a first polyester mixture; and
polymerizing the first polyester mixture to form a second polyester mixture, wherein the second polyester mixture has a diethylene glycol concentration of greater than 0.1 wt % but less than 1 wt %, based on the total weight of the second polyester mixture, and a polydispersity index of polyethylene terephthalate in the second polyester mixture is greater than 2 but less than 3.

2 . The manufacturing method of claim 1 , wherein the mixing the Bis(2-Hydroxyethyl) terephthalate monomer with the terephthalic acid to form the mixture comprises mixing an alkaline substance with the Bis(2-Hydroxyethyl)terephthalate monomer and the terephthalic acid.

3 . The manufacturing method of claim 2 , wherein the alkaline substance comprises tetraethylammonium hydroxide.

4 . The manufacturing method of claim 1 , wherein the second polyester mixture has an intrinsic viscosity in a range from 0.5 to 0.8.

5 . The manufacturing method of claim 1 , wherein the polymerizing the first polyester mixture to form the second polyester mixture comprises adding a catalyst into the first polyester mixture.

6 . The manufacturing method of claim 1 , wherein a molar ratio of the Bis(2-Hydroxyethyl) terephthalate monomer to the terephthalic acid ranges from 1.31:1 to 1.09:1.

7 . The manufacturing method of claim 1 , wherein the first polyester mixture comprises Bis(2-Hydroxyethyl) terephthalate oligomer.

8 . The manufacturing method of claim 7 , wherein the first polyester mixture further comprises diethylene glycol.

9 . The manufacturing method of claim 1 , wherein the manufacturing method is devoid of a step of adding nucleating agents.

10 . A polyester mixture, comprising:
polyethylene terephthalate having a polydispersity index of greater than 2 but less than 3; and diethylene glycol, wherein the diethylene glycol has a weight percentage of greater than 0.1 wt % but less than 1 wt %, based on a total weight of the polyester mixture.

11 . The polyester mixture of claim 10 , wherein the polyester mixture has an intrinsic viscosity in a range from 0.5 to 0.8.

Assignees

• Far Eastern New Century Corp

Inventors

• Hwang Der-Ren
• Wang Cheng-Ting
• Wang Hsiao-Chan
• Lee Yi-Chen

Classifications

• C08G63/183 Primary

  Terephthalic acids · CPC title

• C08G63/866

  Antimony or compounds thereof · CPC title

• C08G63/86

  Germanium, antimony, or compounds thereof · CPC title

• C08G63/78

  Preparation processes · CPC title

• C08G63/87

  Non-metals or inter-compounds thereof (boron C08G63/84) · CPC title