公开(公告)号：US20230167230A1

公开(公告)日：2023-06-01

申请号：US17997071

申请日：2020-04-26

申请人： WANHUA CHEMICAL (SICHUAN) CO., LTD. ,  WANHUA CHEMICAL GROUP CO., LTD.

发明人： Shuangyi SUN ,  Yitao QIAO

IPC分类号： C08G63/08 ,  C08G63/82 ,  C08G63/85

CPC分类号： C08G63/08 ,  C08G63/823 ,  C08G63/85

摘要： The present invention relates to the technical field of the production of polylactic acid, and in particular to a production method for preparing polylactic acid by means of a ring-opening polymerization method, and a prepolymer mixture and the polylactic acid. The production method comprises: (1) enabling an initiator, a catalyst and a monomer I to be in contact in a production device to undergo a ring-opening polymerization reaction, so as to generate a prepolymer mixture containing a polylactic acid prepolymer; and (2) enabling the prepolymer mixture and a monomer II to be in contact with one another to undergo a reaction, so as to generate a high molecular weight polylactic acid. The monomer I and the monomer II are the same or are different, and each independently comprises lactide. The production method provided by the present invention can reduce the fluctuation in the feeding quality of the initiator and the catalyst, and can improve the production stability during the production process.

公开(公告)号：US20230018924A1

公开(公告)日：2023-01-19

申请号：US17784879

申请日：2019-12-23

申请人： WANHUA CHEMICAL GROUP CO., LTD.

发明人： Qiang HAN ,  Qinhua ZHANG ,  Ning MA ,  Yibing ZHAO ,  Shuangyi SUN ,  Bo LIU ,  Yifeng SUN

IPC分类号： C08F279/04 ,  C08F2/26 ,  C08F2/38 ,  C08F2/02 ,  C08F6/16 ,  C08F6/22 ,  C08J3/16

摘要： Disclosed in the present invention are ABS rubber powder with a low impurity content, a preparation method therefor, and an ABS resin. The ABS rubber powder is treated by using the following steps: washing the ABS rubber powder with a washing solution I, and monitoring the content of soluble organic carbon in the ABS rubber powder until the content of soluble organic carbon in the ABS rubber powder is less than or equal to 9000 ppm, so as to obtain the ABS rubber powder with the low impurity content. In the present invention, by controlling the content of soluble organic carbon or the contents of soluble organic carbon and iron ions in the ABS powder, the ABS resin with a low yellow index of less than or equal to 18 is obtained.