公开(公告)号：US20220177692A1

公开(公告)日：2022-06-09

申请号：US17440684

申请日：2021-01-27

Applicant: LG CHEM, LTD.

Inventor： Da Eun SUNG ,  Tae Hoon KIM ,  Chun Ho PARK ,  Yong Hee AN ,  Wang Rae JOE ,  Ho Hoon KIM ,  Jeong Min JANG

IPC: C08L51/04

Abstract: Provided is a thermoplastic resin composition which includes: a first graft copolymer including a first acrylic rubber polymer; a second graft copolymer including a second acrylic rubber polymer; and a first styrene-based copolymer including an alkyl-substituted styrene-based monomer unit and an acrylonitrile-based monomer unit, wherein the first acrylic rubber polymer has an average particle diameter larger than that of the second acrylic rubber polymer, the first graft copolymer is included in a larger amount than the second graft copolymer, and the sum of the first graft copolymer and the second graft copolymer is 22 parts by weight or less with respect to 100 parts by weight of the sum of the first graft copolymer, the second graft copolymer, and the first styrene-based copolymer.

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：US20200095346A1

公开(公告)日：2020-03-26

申请号：US16619063

申请日：2018-11-16

Applicant: LG CHEM, LTD.

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

IPC: C08F2/24 ,  C08F279/06 ,  C08F285/00 ,  C08F279/04 ,  C08L51/06

Abstract: The present invention provides a method of preparing a graft copolymer, which comprises: emulsion-polymerizing one or more selected from the group consisting of an aromatic vinyl-based monomer to prepare a seed, a vinylcyano-based monomer and an alkyl (meth)acrylate-based monomer; emulsion-polymerizing the seed and an alkyl (meth)acrylate-based monomer to prepare a core; and emulsion-polymerizing the core, an aromatic vinyl-based monomer and a vinylcyano-based monomer to prepare a shell, wherein one or more steps selected from the group consisting of the steps of preparing the seed, the core and the shell comprises adding an emulsifier comprising a compound represented by Formula 1 below.

公开(公告)号：US20190152910A1

公开(公告)日：2019-05-23

申请号：US16091475

申请日：2017-11-06

Applicant: LG CHEM, LTD.

Inventor： Joo Young CHEON ,  Jun Seon CHOI ,  Ji Yeon KIM ,  Wang Rae JOE ,  Kyung Soo KIM ,  Eung Seob YEOM ,  Won Kyun LEE

IPC: C07D207/452 ,  B01J27/16 ,  B01J27/28

Abstract: The present invention relates to a synthesis method of N-substituted maleimides using a non-homogeneous solid acid catalyst, and particularly, a synthesis method of N-substituted maleimides with high synthesis yield by using a zirconium(IV) hydrogen phosphate as a catalyst, by which, the loss of the catalyst is minimized, the separation and recovering processes of the catalyst are simplified, in case when the activity of the separated and recovered catalyst is decreased, the complete regeneration of the catalyst is possible via washing or firing, and solvents that could be used during a washing process of the catalyst are not limited.

公开(公告)号：US20180273460A1

公开(公告)日：2018-09-27

申请号：US15762868

申请日：2016-12-15

Applicant: LG CHEM, LTD.

Inventor： Kyung Soo KIM ,  Jun Seon CHOI ,  Ji Yeon KIM ,  Joo Young CHEON ,  Wang Rae JOE ,  Hye Jeong OK

IPC: C07C51/25 ,  C07C45/52 ,  B01J27/198 ,  B01J23/888

CPC classification number: C07C51/252 ,  B01J23/8885 ,  B01J27/198 ,  C07C45/52 ,  C07C47/22 ,  C07C57/04

Abstract: The present invention relates to a method for preparing acrylic acid from glycerin. More specifically, the present invention provides a method which can improve the selectivity of acrolein by applying a specific catalyst composition and process conditions to minimize the generation of coke carbon of the catalyst, and can prepare acrylic acid with higher productivity for a longer duration of time because a dehydration reaction can be performed for a longer working period while maintaining catalyst activity at a high level during the reaction.