公开(公告)号：US20240360292A1

公开(公告)日：2024-10-31

申请号：US18556486

申请日：2022-05-03

Applicant: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY

Inventor： Joungmo CHO ,  Ye Rim JO ,  Thi Hong Ngan LE

IPC: C08J11/08 ,  C08J11/22 ,  D06L4/00

CPC classification number: C08J11/08 ,  C08J11/22 ,  D06L4/00 ,  C08J2301/02 ,  C08J2333/04 ,  C08J2367/00 ,  C08J2377/00 ,  C08J2389/04

Abstract: The present invention relates to an extractant and an extraction method for removing color-expressing foreign substances from a colored polymer containing an ester functional group and a method for chemically selecting a polymer containing an ester functional group from a colored polymer mixture and, more specifically, to an extractant capable of effectively removing foreign substances, such as a dye and a pigment, from a colored polymer exhibiting a color by the foreign substances and containing an ester functional group, to a method for eluting most of color-expressing foreign substances by contact with a colored polymer containing an ester functional group while the extractant is maintained at a specific temperature range, and to a method of adding the extractant to a colored polymer mixture to selectively elute foreign substances from only a colored polymer containing an ester functional group and then effectively selecting, through color differentiation, a polymer having the foreign substances removed therefrom and containing an ester functional group.