公开(公告)号：US20190315889A1

公开(公告)日：2019-10-17

申请号：US16469030

申请日：2018-09-14

Applicant: LG CHEM, LTD.

Inventor： Jeong Hun CHO ,  Young Soo SONG ,  Hyun Min KIM ,  Chang Hun KIM ,  Hyo Yong KIM ,  Joon Hee CHO

IPC: C08F2/01 ,  C08F2/06 ,  C08F20/44 ,  D01F9/22

Abstract: The present invention relates to a method of preparing a (meth)acrylonitrile-based polymer for preparing a carbon fiber, which comprises adding a reaction solution comprising a (meth)acrylonitrile-based monomer and a reaction solvent to a reactor to perform solution polymerization, performing solution polymerization under a condition in which a power consumption of the reactor is 1 to 5 kW/m3 when the reaction solution in the reactor has a viscosity of 0.1 poise or more and 250 poise or less, and performing solution polymerization under a condition in which a power consumption of the reactor is 8 to 13 kW/m3 when the reaction solution in the reactor has a viscosity of more than 250 poise and 450 poise or less.

公开(公告)号：US20210301051A1

公开(公告)日：2021-09-30

申请号：US17266078

申请日：2019-11-01

Applicant: LG CHEM, LTD.

Inventor： Jong Gil KIM ,  Chang Hun KIM ,  Jeong Hun CHO ,  Hyun Min KIM ,  Joon Hee CHO ,  Hyo Yong KIM

IPC: C08F220/46 ,  C01B32/05 ,  D01F9/22

Abstract: Provided is a method of preparing an acrylonitrile-based copolymer for a carbon fiber, which comprises: preparing a reaction solution including a monomer mixture comprising a sulfonate-based monomer represented by Chemical Formula 1, a carboxylic acid-based monomer, and an acrylonitrile-based monomer and an organic solvent; and subjecting the reaction solution to polymerization, wherein the monomer mixture comprises the sulfonate-based monomer represented by Chemical Formula 1 at 0.55 to 1.6 mol %.

公开(公告)号：US20220244235A1

公开(公告)日：2022-08-04

申请号：US17617196

申请日：2020-06-19

Applicant: LG CHEM, LTD.

Inventor： Hyo Yong KIM ,  Jin Sook RYU ,  Sunok OH ,  Sung Joon OH

IPC: G01N33/44 ,  G01N24/08 ,  B01D15/34

Abstract: Provided is a method of analyzing a copolycarbonate. More particularly, provided is a method of analyzing a copolycarbonate, in which a polysiloxane structure is introduced into the main chain of a polycarbonate, the method capable of more accurately analyzing a weight average molecular weight, a number average molecular weight, and a molecular weight distribution of a polysiloxane-containing aromatic diol compound which is used as a starting material.