CATALYTIC SYSTEMS AND POLYMERIZATION PROCESSES USING ALKYLLITHIUM AS CO-CATALYST Russian patent published in 2005 - IPC

FIELD: polymerization processes and polymerization catalysts.

SUBSTANCE: catalytic system including chromium compound deposited on silicon oxide/titanium oxide carrier, which is preliminarily reduced by carbon monoxide, and co-catalyst selected from group consisting of (i) alkyl lithium, (ii) dialkylaluminum alkoxides combined with at least one alkyl metal selected from group consisted of alkylzinc, alkylaluminum, alkylboron, and mixtures thereof, and (iii) their mixtures, can be used for polymerization of olefins to form low-density polymer with reduced melt index and/or greatly loaded melt index. Such catalyst may be used jointly with olefin polymerization Ziegler-Natta catalytic system. Polymerization processes involving above-defined catalytic systems are also disclosed. Polymers obtained via processes according to invention also show elevated volume viscosity values and find use as components in preparation of bimodal high-molecular weight resins for production of films and/or in pneumatic molding processes.

EFFECT: expanded olefin polymerization possibilities.

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