Polyester copolymer comprising recycled monomers

Patent metadata

Field	Value
Publication number	US-2024002588-A1
Application number	US-202118247458-A
Country	US
Kind code	A1
Filing date	Sep 14, 2021
Priority date	Nov 11, 2020
Publication date	Jan 4, 2024
Grant date	—

Abstract

In the present disclosure, it is possible to identify and select recycled bis-2-hydroxyethyl terephthalate of a certain quality or higher, and thus the quality of a polyester resin prepared using the recycled bis-2-hydroxyethyl terephthalate can be improved.

First claim

What is claimed is:

1 . A polyester resin obtained by copolymerizing recycled bis-2-hydroxyethyl terephthalate, a dicarboxylic acid or its derivative, and a diol containing ethylene glycol and a comonomer and having a structure in which a moiety derived from the bis-2-hydroxyethyl terephthalate, an acid moiety derived from the dicarboxylic acid or its derivative, and a diol moiety derived from the diol are repeated,
wherein the polyester resin satisfies the following Equation 1:
0<( A×B/ 100)<10  [Equation 1]

in Equation 1, A is a YID value of a 25 wt % recycled bis-2-hydroxyethyl terephthalate solution, and B is wt % of a moiety derived from recycled bis-2-hydroxyethyl terephthalate based on a total weight of the polyester copolymer.

2 . The polyester resin of claim 1 ,
wherein a solvent of the 25 wt % recycled bis-2-hydroxyethyl terephthalate solution in A is dimethylformaldehyde, ethylene glycol, water, or cyclohexanedimethanol.

3 . The polyester resin of claim 1 ,
wherein A is more than 0 and less than 15.

4 . The polyester resin of claim 1 ,
wherein B is 1 to 95.

5 . The polyester resin of claim 1 ,
wherein the dicarboxylic acid or its derivative is terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, diphenyl dicarboxylic acid, 4,4′-stilbenedicarboxylic acid, 2,5-furandicarboxylic acid, or 2,5-thiophenedicarboxylic acid.

6 . The polyester resin of claim 1 ,
wherein the comonomer is cyclohexanedimethanol, isosorbide, or diethylene glycol.

7 . The polyester resin of claim 1 ,
wherein the polyester copolymer has an intrinsic viscosity of 0.50 to 1.0 dl/g.

8 . The polyester resin of claim 1 ,
wherein a value of (Hunter L value)−(Hunter b value) measured with respect to a 6 mm-thick specimen of the polyester copolymer is 83 or more.

9 . A product comprising the polyester copolymer according claim 1 .

10 . A product comprising the polyester copolymer according claim 2 .

11 . A product comprising the polyester copolymer according claim 3 .

12 . A product comprising the polyester copolymer according claim 4 .

13 . A product comprising the polyester copolymer according claim 5 .

14 . A product comprising the polyester copolymer according claim 6 .

15 . A product comprising the polyester copolymer according claim 7 .

16 . A product comprising the polyester copolymer according claim 8 .

17 . A product comprising the polyester copolymer according claim 9 .

Assignees

• Sk Chemicals Co Ltd

Inventors

• Hwang Da-Young
• Kim Ha-Neul
• Lee Yoo Jin

Classifications

• C08G63/183 Primary

  Terephthalic acids · CPC title

• C08G63/199 Primary

  Acids or hydroxy compounds containing cycloaliphatic rings · CPC title

• C08G63/19

  Hydroxy compounds containing aromatic rings · CPC title

• C08G63/863

  Germanium or compounds thereof · CPC title

• C08G63/60 Primary

  derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds · CPC title