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## KleenAir announces major increase in sales KleenAir Systems Inc, in its recently released annual report, indicated an increase in sales from $51,235 in 2002 to $734,993 in 2003 -a fifteenfold increase. In the face of continued delays by the Environmental Protection Agency (EPA) and California Ai
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