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- W2010205655 abstract "Abstract Hafnium polymerization catalysts supported on spray-dried magnesium chloride have been prepared by precipitation with alkylaluminium chlorides from paraffin solutions of hafnium(tetra-n-butanolate). These catalysts have been used for ethylene polymerization after activation with different aluminium alkyl derivatives such as tri(isobutyl) aluminium, triethylaluminium and diethylaluminium chloride. The influence of the polymerization conditions, i.e . hydrogen pressure, 1-butene content, temperature, cocatalyst and ethyl benzoate, on the specific activity, polymerization rate and molecular weight has been investigated. The behaviour of the Hf catalyst has been compared to that of similar systems based on titanium or zirconium. The results obtained suggest that the selection of appropriate transition metal derivatives provides the further possibility of tailoring the characteristics of polyethylene." @default.
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- W2010205655 date "1989-11-01" @default.
- W2010205655 modified "2023-09-25" @default.
- W2010205655 title "Supported hafnium catalysts for ethylene polymerization" @default.
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- W2010205655 doi "https://doi.org/10.1016/0304-5102(89)80179-8" @default.
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