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Studies of Ziegler-type catalysts for the polymerization of ethylene and propylene II The polymerization of ethylene with VOCl3-Et3Al2Cl3 (chlorinated activator) catalysts

✍ Scribed by E.W. Duck; D. Grant; J.R. Horder; D.K. Jenkins; A.E. Marlow; S.R. Wallis; A.G. Doughty; J.M. Marandon; G.A. Skinner

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
626 KB
Volume
10
Category
Article
ISSN
0014-3057

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✦ Synopsis

VOCla-Et3A12Cl 3 (chlorinated activator) catalysts have been employed for the polymerization of ethylene at T between 15 and 85 Β° in n-hexane. Using butylperchlorocrotonate as the activator, the following catalyst efficiencies (g polymer/gV, hr, atmosphere ethylene in the cap gas) were achieved: l06~, MFI = 0.00; l0 s's, e.g. MFI = 1.0 (with 9 per cent H, present in the cap gas) and l0 ~''9, MFI = 0.4 (with 44 mmole/l styrene in the hexane medium). Reactions between the aluminium alkyl and the activator molecules produced other chlorinated species of high average activator effectiveness. The catalyst system could be reactivated by further additions of Et3AI2Cl 3 . The minimum value of the polymerization propagation rate constant is estimated to be 1012.2-6 Γ— 103/4.6T cm3/mole sec.

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