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:
Feb. 14, 2017
Filed:
Nov. 10, 2010
Choon-hwa Lee, Daejeon, KR;
Moon-seok Chun, Daejeon, KR;
Choon-Hwa Lee, Daejeon, KR;
Moon-Seok Chun, Daejeon, KR;
LG CHEM, LTD., Seoul, KR;
Abstract
Disclosed is a method for preparing a vinyl aromatic hydrocarbon-conjugated diene block copolymer using a coupling reaction with improved ion stability. The method comprises (a) polymerizing a vinyl aromatic hydrocarbon monomer in a hydrocarbon solvent with an organic lithium compound as a polymerization initiator to prepare a first mix solution comprising a vinyl aromatic hydrocarbon block; and (b) adding a conjugated diene monomer to the first mix solution of step (a) to form a conjugated diene block on an end of the vinyl aromatic hydrocarbon block and to thereby prepare a second mix solution comprising a vinyl aromatic hydrocarbon block-conjugated diene block, wherein the method further comprises (c) adding a Lewis acid to the first mix solution before, during or after polymerization of the vinyl aromatic hydrocarbon monomer of step (a).