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Copolymerizations of ethylene/1-hexene were conducted using different zirconocene/AlR 3 /B(C 6 F 5 ) 3  catalytic systems at 50°C. When AlEt 3  was used as alkylate agent, very low copolymerization activity was observed with both bridged catalyst Et[Ind] 2 ZrCl 2  and unbridged zirconocene Cp 2 ZrCl 2  in-situ activated with B(C 6 F 5 ) 3 . In appropriate Al/Zr mole ratio using Al( i -Bu) 3 , the catalytic activities of both zirconocene catalytic systems were similar to those of sophisticated zirconocene/methylaluminoxane(MAO) catalytic system. The catalytic activities, comonomer incorporation and molecular weight of the copolymer synthesized with Et[Ind] 2 ZrCl 2 /Al( i -Bu) 3 /B(C 6 F 5 ) 3  were higher than those obtained with Cp 2 ZrCl2/Al( i - Bu) 3 /B(C 6 F 5 ) 3 . The effect of the concentration of 1-hexene on catalytic activity, copolymer molecular weight, and comonomer incorporation was investigated. The complicated “co-monomer effect”, together with an increase in comonomer incorporation, a decrease in the copolymer molecular weight, was found when the comonomer concentration was increased.

Copolymerization of Ethylene and 1-Hexene Catalyzed by the Zirconocene/Al(i-Bu) 3 /B(C 6 F 5 ) 3 Catalytic System