公开(公告)号：US20170342204A1

公开(公告)日：2017-11-30

申请号：US15534274

申请日：2015-12-01

Applicant: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY

Inventor： Jae Chang LEE ,  Jong Geon JEGAL ,  Bong Keun SONG

IPC: C08G63/08 ,  C08G63/85 ,  C08G63/91 ,  C08L101/00

CPC classification number: C08G63/08 ,  C08G63/78 ,  C08G63/85 ,  C08G63/91 ,  C08L101/00 ,  C09D167/04

Abstract: The present invention relates to a method for preparing a stereoblock polylactide, comprising: a step of obtaining a first reaction mixture with a monomer conversion rate of 80 to 95% by adding a catalyst to a D-lactide and growing a PDLA chain; a step of obtaining a second reaction mixture with a monomer conversion rate of 80 to 95% by adding an L-lactide to the first reaction mixture and growing a racemic PDLLA chain at the end of the PDLA chain; and a step of further adding an L-lactide to the second reaction mixture and growing a PLLA chain at the end of the PDLLA chain through a polymerization reaction. The preparation method is capable of providing a more convenient synthesis by skipping a process of removing residual monomers in the middle of the reaction, and also of preventing multi-blocking and oligomerization of polymer chains due to a mixture of chains by gradually adding polymerizable monomers while controlling the monomer conversion rate in a one-port synthesis, thereby reducing chain transfer during the polymerization.