公开(公告)号：US20210024678A1

公开(公告)日：2021-01-28

申请号：US16968996

申请日：2019-08-28

Applicant: LG CHEM, LTD.

Inventor： Bong Keun AHN ,  Min Jung KIM ,  Wang Rae JOE ,  Yong Yeon HWANG ,  Jang Won PARK ,  Ji Yoon JEON

IPC: C08F285/00 ,  C08L51/00 ,  C08L25/12

Abstract: The present invention relates to a method for preparing a graft copolymer and a graft copolymer. The method for preparing a graft copolymer includes the steps of: 1) preparing a seed by adding one or more selected from the group consisting of an alkyl (meth)acrylate-based monomer, an aromatic vinyl-based monomer, and a vinyl cyan-based monomer and carrying out polymerization; 2) preparing a core in the presence of the seed by adding an alkyl (meth)acrylate-based monomer and carrying out polymerization; and 3) preparing a shell in the presence of the core by adding an aromatic vinyl-based monomer and a vinyl cyan-based monomer and carrying out polymerization, wherein an activator including a compound represented by Chemical Formula 1 is added in the step 3), and wherein the core has an average particle diameter of 320 nm to 520 nm. According to this method, a graft copolymer that is particularly excellent in impact resistance, thermal stability, surface clarity, whiteness, appearance quality, and weather resistance can be provided.

公开(公告)号：US20210002472A1

公开(公告)日：2021-01-07

申请号：US16954995

申请日：2019-08-05

Applicant: LG CHEM, LTD.

Inventor： Bong Keun AHN ,  Min Jung KIM ,  Jang Won PARK ,  Yong Yeon HWANG ,  Wang Rae JOE ,  Ji Yoon JEON

IPC: C08L51/00 ,  C08F265/06 ,  C08F257/02 ,  C08F220/14 ,  C08F220/18 ,  C08F220/44 ,  C08F212/08 ,  C08F236/20 ,  C08J3/12

Abstract: Provided are a method of preparing a graft copolymer, a graft copolymer, and a thermoplastic resin molded article including the graft copolymer, the method including: 1) preparing a seed by adding one or more selected from the group consisting of an alkyl (meth)acrylate-based monomer, an aromatic vinyl-based monomer, and a vinyl cyan-based monomer and performing polymerization; 2) in the presence of the seed, preparing a core by adding an alkyl (meth)acrylate-based monomer and performing polymerization; and 3) in the presence of the core, preparing a shell by adding an aromatic vinyl-based monomer and a vinyl cyan-based monomer and performing polymerization, wherein the method further includes adding an alkyl acrylate-based polymer. When the alkyl acrylate-based polymer is included in a graft copolymer, a graft copolymer and a thermoplastic resin molded article excellent in weather resistance, fluidity, mechanical properties, and appearance quality can be provided.

公开(公告)号：US20210246236A1

公开(公告)日：2021-08-12

申请号：US17051757

申请日：2019-10-10

Applicant: LG CHEM, LTD.

Inventor： Min Jung KIM ,  Yong Yeon HWANG ,  Bong Keun AHN ,  Wang Rae JOE ,  Jang Won PARK ,  Ji Yoon JEON

IPC: C08F6/22 ,  C08F2/22 ,  C08F20/14 ,  C08F265/06 ,  C08F12/08 ,  C08F20/44

Abstract: The present invention relates to a method of preparing a graft copolymer powder, which includes: preparing a seed by adding one or more selected from the group consisting of an alkyl (meth)acrylate-based monomer, an aromatic vinyl-based monomer and a vinyl cyan-based monomer to a reactor and carrying out polymerization; preparing a core in the presence of the seed by adding an alkyl (meth)acrylate-based monomer and carrying out polymerization; and preparing a graft copolymer latex in the presence of the core by adding an aromatic vinyl-based monomer and a vinyl cyan-based monomer and carrying out polymerization; adding an alkyl methacrylate-based polymer to the graft copolymer latex and carrying out coagulation, and more particularly, to a method of preparing a graft copolymer powder that is excellent in weather resistance, fluidity, mechanical properties, surface gloss and appearance quality.