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:
May. 13, 2003
Filed:
Jun. 14, 2001
Applicant:
Inventors:
Young-Chan Jang, Taejeon, KR;
Pil-Sung Kim, Taejeon, KR;
Gwang-Hoon Kwag, Taejeon, KR;
A-Ju Kim, Taejeon, KR;
Seung-Hwon Lee, Taejeon, KR;
Assignee:
Korea Kumho Petrochemical Co., Ltd., Seoul, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F 4/70 ; C08F 4/50 ;
U.S. Cl.
CPC ...
C08F 4/70 ; C08F 4/50 ;
Abstract
A method for preparing polybutadiene having controlled molecular weight and high 1,4-cis content over 95% in the presence of a diethylzinc compound as a cocatalyst (i.e., alkylating agent) and molecular-weight-controlling agent, in which the molecular weight of the polybutadiene is controlled by variating the added amount of the diethylzinc compound without deterioration of 1,4-cis content nor polymerization yield, thus guaranteeing the optimum processability and physical properties of polymer according to the use purpose.