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The polymerization of ethylene was carried out with a novel in situ supported metallocene catalyst that eliminated the need for a supporting step before polymerization. In the absence of trimethyl aluminum (TMA), in situ supported Et[Ind] 2 ZrCl 2 was not active, but the addition of TMA during polym
## Abstract **Summary:** In this paper, a mathematical model describing olefin polymerization with metallocene catalysts is presented. It is an improvement of a previous model, the βparticle growth modelβ (PGM) proposed by, among others, one of the authors of the present work and derives from the s
experienced by the catalyst division. Group earnings before tax in 1H 2002 rose 1.5% to β¬7 M, with sales declining 9.9% to β¬365.3 M.