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:
Mar. 12, 2013
Filed:
Apr. 28, 2009
Dongmei Cui, Changchun, CN;
Xinli Liu, Changchun, CN;
Dongtao Liu, Changchun, CN;
Wei Gao, Changchun, CN;
Shihui LI, Changchun, CN;
Lingfang Wang, Changchun, CN;
Zhichao Zhang, Changchun, CN;
Dongmei Cui, Changchun, CN;
Xinli Liu, Changchun, CN;
Dongtao Liu, Changchun, CN;
Wei Gao, Changchun, CN;
Shihui Li, Changchun, CN;
Lingfang Wang, Changchun, CN;
Zhichao Zhang, Changchun, CN;
Changchun Institute of Applied Chemistry Chinese Academy of Sciences, Changchun, Jilin Province, CN;
Abstract
An isoprene or butadiene cis 1,4-selective polymerization catalyst system together with its polymerization method is provided. This catalyst system is composed of NCN-imine pincer type rare earth metal complex of formula [2,6-(CH═N—R)-4-R-1-CH]LnX(THF)and alkylating reagent. In an hydrocarbon solvent or under bulk conditions, at a polymerization temperature in a range of −20-120° C., the conjugated diene is polymerized by using the catalyst system, to produce polyisoprene and polybutadiene having controllable number-average molecular weight, molecular weight distribution of 3.0 or less than, and cis 1,4-content of 95% or more, even 99% or more. The crude rubber and vulcanized rubber of the polyisoprene have high strength, stretching crystallization capability and transparency.