Title:
METHOD FOR STORING RECYCLED BIS(2-HYDROXYETHYL)TEREPHTHALATE AND METHOD FOR PREPARING POLYESTER RESIN
Document Type and Number:
WIPO Patent Application WO/2023/249327
Kind Code:
A1
Abstract:
Recycled bis(2-hydroxyethyl)terephthalate, obtained by depolymerization of a waste polyester, is mixed and stored with a solvent under specific conditions, leading to the stable maintenance of purity and yellowness and the improvement in product quality, including colors, of a final polyester resin prepared therefrom.
Inventors:
KIM HA-NEUL (KR)
LEE YOO JIN (KR)
HWANG DA-YOUNG (KR)
LEE YOO JIN (KR)
HWANG DA-YOUNG (KR)
Application Number:
PCT/KR2023/008270
Publication Date:
December 28, 2023
Filing Date:
June 15, 2023
Export Citation:
Assignee:
SK CHEMICALS CO LTD (KR)
International Classes:
C07C67/62; C07C69/94; C08G63/06; C08G63/60; C08G63/85; C08J5/18; C08J11/10
Domestic Patent References:
WO2021032826A1 | 2021-02-25 |
Foreign References:
KR20220059681A | 2022-05-10 | |||
KR20210066507A | 2021-06-07 | |||
KR20130120906A | 2013-11-05 | |||
KR20020077874A | 2002-10-14 |
Attorney, Agent or Firm:
FIRSTLAW P.C. (KR)
Download PDF: