The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 02, 2025
Filed:
Dec. 07, 2023
Applicant:
SK Chemicals Co., Ltd., Seongnam-si, KR;
Inventors:
Assignee:
SK CHEMICALS CO., LTD., Seongnam-si, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 67/54 (2006.01); C07C 67/02 (2006.01); C07C 69/82 (2006.01); C08J 11/24 (2006.01);
U.S. Cl.
CPC ...
C07C 67/54 (2013.01); C07C 67/02 (2013.01); C07C 69/82 (2013.01); C08J 11/24 (2013.01); C08J 2367/02 (2013.01);
Abstract
A method for preparing a recycled raw material uses a waste copolyester. The method for preparing a recycled raw material includes (1) depolymerizing a waste copolyester to obtain a first reactant; (2) removing impurities present in the first reactant to obtain a second reactant; (3) distilling the second reactant to obtain a third reactant containing crude recycled bis-2-hydroxyethyl terephthalate and a fourth reactant containing a recycled diol-ester; and (4) mixing the third reactant with an aqueous solvent and recrystallizing it to obtain a fifth reactant containing recycled bis-2-hydroxyethyl terephthalate and a filtrate.