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1. (WO2018139775) GRAFT COPOLYMER, PREPARATION METHOD THEREFOR, THERMOPLASTIC RESIN COMPOSITION CONTAINING SAME, AND MOLDED PRODUCT

Pub. No.:    WO/2018/139775    International Application No.:    PCT/KR2018/000057
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Wed Jan 03 00:59:59 CET 2018
IPC: C08F 279/02
C08L 55/02
C08K 5/098
C08F 2/24
C08F 2/38
C08F 2/44
Applicants: LG CHEM, LTD.
(주) 엘지화학
Inventors: JANG, Seok Goo
장석구
CHOI, Jeong Su
최정수
LEE, Won Seok
이원석
LEE, Roo Da
이루다
PARK, Sang Hoo
박상후
OK, Hye Jeong
옥혜정
KIM, Ho Hoon
김호훈
SHIM, Hyung Seop
심형섭
YOO, Keun Hoon
유근훈
Title: GRAFT COPOLYMER, PREPARATION METHOD THEREFOR, THERMOPLASTIC RESIN COMPOSITION CONTAINING SAME, AND MOLDED PRODUCT
Abstract:
The present invention relates to a graft copolymer having improved thermal stability, a preparation method therefor, a thermoplastic resin composition containing the same, and a molded product and, more specifically, to a graft copolymer having a core-shell structure, the graft copolymer being polymerized by comprising a specific amount of metal sorbate, which can be readily removed in a dehydration process, as an emulsifier so as to alleviate the problem of thermal stability deterioration caused by residual emulsifiers during the preparation of an emulsion-polymerized graft copolymer. According to the present invention, by reducing the amount of residual emulsifiers, the thermal stability of a graft copolymer is improved, and a thermoplastic resin composition and a molded product, which comprise the same, have excellent impact strength, flowability, and the like and also have effects of improved physical properties such as transparency, a degree of discoloration during injection duration and a degree of discoloration during high-temperature long-term storage.