The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 30, 2022
Filed:
Sep. 18, 2018
Applicant:
Lg Chem, Ltd., Seoul, KR;
Inventors:
Chang Hun Kim, Daejeon, KR;
Hyun Min Kim, Daejeon, KR;
Jeong Hun Cho, Daejeon, KR;
Joon Hee Cho, Daejeon, KR;
Assignee:
LG CHEM, LTD., Seoul, KR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F 20/44 (2006.01); C08F 220/46 (2006.01); D01F 9/22 (2006.01); C08F 120/44 (2006.01); C08F 220/48 (2006.01); C08F 120/42 (2006.01); C08F 220/44 (2006.01); C08F 20/42 (2006.01); C08F 2/06 (2006.01); C08F 2/04 (2006.01);
U.S. Cl.
CPC ...
C08F 20/44 (2013.01); C08F 20/42 (2013.01); C08F 120/42 (2013.01); C08F 120/44 (2013.01); C08F 220/44 (2013.01); C08F 220/46 (2013.01); C08F 220/48 (2013.01); D01F 9/22 (2013.01); C08F 2/04 (2013.01); C08F 2/06 (2013.01); C08F 2800/20 (2013.01); D01F 9/225 (2013.01);
Abstract
A method of preparing an acrylonitrile-based copolymer for a carbon fiber. The method includes: preparing a reaction solution including a (meth)acrylonitrile-based monomer and a first reaction solvent; adding a first portion of a radical polymerization initiator to the reaction solution to initiate polymerization; and adding a second portion of the radical polymerization initiator to the reaction solution when a polymerization conversion ratio is between 70 to 80%.