公开(公告)号：EP3872104A1

公开(公告)日：2021-09-01

申请号：EP20854245.6

申请日：2020-08-03

申请人： LG Chem, Ltd.

发明人： KIM, Yoo Vin ,  SUK, Jae Min ,  JEONG, Young Hwan ,  PARK, Changhong

IPC分类号： C08F279/04 ,  C08F6/18 ,  C08F2/24 ,  C08L55/02 ,  C08L25/12

摘要： The present invention relates to a method of preparing a graft copolymer, and a thermoplastic resin composition including the same. More specifically, the present invention relates to a method of preparing a graft copolymer, the method including a step of preparing graft copolymer latex by graft-polymerizing 20 to 40 % by weight of an aromatic vinyl compound and 1 to 20 % by weight of a vinyl cyanide compound onto 50 to 70 % by weight of conjugated diene rubber latex having a solids content of 30 to 65 % by weight; and a step of coagulating the prepared graft copolymer latex by adding 0.04 to 0.27 parts by weight of a nonionic polymer coagulant as a first coagulant, and 0.47 to 1.65 parts by weight of a cationic polymer coagulant or 0.73 to 3.35 parts by weight of an anionic polymer coagulant as a second coagulant to 100 parts by weight (based on solids) of the prepared graft copolymer latex, wherein, when the second coagulant is the cationic polymer coagulant, the total weight of the nonionic polymer coagulant and the cationic polymer coagulant is 0.7 to 1.7 parts by weight, and when the second coagulant is the anionic polymer coagulant, the total weight of the nonionic polymer coagulant and the anionic polymer coagulant is 0.97 to 3.37 parts by weight, and a thermoplastic resin composition including the graft copolymer. According to the present invention, when a graft copolymer is prepared using the above-described method, the graft copolymer may have improved coagulation efficiency and high gloss. In addition, a b-value measured using a Hunter lab colorimeter and a b-value measured after being left may be small, thereby realizing excellent color properties.

公开(公告)号：EP3696201A1

公开(公告)日：2020-08-19

申请号：EP19880937.8

申请日：2019-10-21

申请人： LG Chem, Ltd.

发明人： SUK, Jae Min ,  KIM, Yoo Vin ,  KIM, Young Min ,  LEE, Jin Hyoung ,  HAN, Sujeong ,  JEONG, Young Hwan ,  PARK, Changhong ,  HEO, Jaewon

IPC分类号： C08F279/02 ,  C08F6/18

摘要： The present invention relates to a method of preparing a graft copolymer and a thermoplastic resin composition including the graft copolymer. More specifically, the present invention relates to a method of preparing a graft copolymer, the method including a step of performing coagulation by adding an acid coagulant to 100 parts by weight (based on solids) of graft copolymer latex prepared by graft-polymerizing an aromatic vinyl compound and a vinyl cyanide compound onto conjugated diene rubber latex; and a step of performing coagulation once more by adding a salt coagulant thereto.
According to the present invention, when the method is used to prepare a graft copolymer, coagulation efficiency may be improved and the gloss of the prepared graft copolymer may be increased. In addition, since a b-value measured using a Hunter lab colorimeter and a b-value measured after being left at 250 °C for 15 minutes are low, the graft copolymer may have excellent color characteristics. In addition, since heating loss is low and scorch time is long, the graft copolymer may have excellent processing characteristics.