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Copolymerization of olefins with SiO2-, Al2O3-, and MgCl2-supported metallocene catalysts activated by trialkylaluminiums

✍ Scribed by Kazuo Soga; Manabu Kaminaka

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
421 KB
Volume
195
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Copolymerizations of ethylene with propene, of ethylene with 1‐hexene and of propene with 1‐hexene were carried out at 40°C under atmospheric pressure with SiO~2~‐, Al~2~O~3~‐ and MgCl~2~‐supported metallocene catalysts using common alkylaluminiums as cocatalyst. From a detailed analysis of copolymers by ^13^C NMR, all the copolymers obtained were found to be random (r~1~·r~2~ ≤ 1). When ethylene was used as a base monomer, the polymer yield markedly increased with increasing comonomer concentration. The molecular weight of the copolymers obtained in this study were found to be much higher than those obtained with homogeneous Kaminsky‐Sinn catalysts. Whereas, the polydispersity (M~w~/M~n~) of the copolymer is dependent on the combination of monomers as well as on the inorganic compounds used as carrier.

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