ISOPRENE OR BUTADIENE CIS 1, 4-POLYMERIC BI-COMPONENT CATALYST SYSTEM AND POLYMERIZATION PROCESS

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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-R1)2-4-R2-1-C6H2]LnX2(TBF)n 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.