Ethylene is polymerized with 1,4-bis(2,6-diisopropylphenyl)acenaphthenediiminenickel (II) dichloride dissolved in the ionic liquid 1-butyl-3-methylimidazolium organochloroaluminate under mild reaction conditions (pressure of 1050 mbar, reaction temperature between –10°C and +10°C). The catalyst solution can be reused in successive ethylene polymerization cycles upon addition of an alkylaluminium cocatalyst, showing enhanced activities and producing polyethylenes with bimodal molecular weight distributions suggesting the formation of non-uniform active centers.
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Pinheiro et al. (2001) studied this question.