文献类型：专利

英文题名：Method for preparing high molecular weight poly lactic acid by direct polycondensation

作者：ZHOU X;ZHU L;YUAN W

机构：[1]UNIV EAST CHINA SCI & TECHNOLOGY

申请号：CN1132868-C

公开日：2003-12-31

语种：英文

收录：DERWENT

摘要：NOVELTY - One polycondensation process of preparing high molecular weight polylactic acid is disclosed. During the process, one kind of dewatering agent is used to dewater selectively in a closed environment. Owing to the continuous dewatering and no loss of lactide, polylactic acid with very high molecular weight may be prepared. Without organic solvent used, the process can obtain very clean polylactic acid at lower operation cost.