Abstract
Branched polyethylene was successfully produced with ethylene as the sole monomer stock by a novel binary tandem catalyst system composed of 2,6-bis(imino)pyridyl iron complex (1) and mono β-diiminato titanium complex (2) activated only by MMAO, in which the complex 2 was the first non-metallocene titanium complex used as copolymerization catalyst. The copolymerization activity can reach up to 106g/molTi·h·atm. And by simple adjustment of the catalyst molar ratios and polymerization conditions, polymers with various branches including ethyl, butyl and long branches and varying branching degrees (from 0 to 10.7/1000C) can be efficiently produced.
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