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AssigneeAtochem
InventorsJean-Loup Lacombe, Claude Brun
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A process for preparation of a transition metal component of a catalytic system for the polymerization of olefins, wherein an organo-magnesium-aluminum reaction product is formed by bringing into contact, a halogenated, alkylated or alkoxylated magnesium compound with an organo-aluminum compound, then subjecting the reaction product to a chlorination and to a treatment by a compound of a transition metal such as Ti, V, Zr and Cr. As an organo-aluminum compound there is used one or several aluminoxane compounds of the formula ##STR1## wherein R' is an alkyl or from C.sub.1 to C.sub.16, the R"s form together a radical --O-- or designate each a radical R' and n is an integer of from 0 to 20. The transition metal component obtained can be used in combination with a co-catalyst and eventually an electron donor to form a catalytic system apt to polymerize the alpha-olefins.
A process for the preparation of a transition metal component for a catalytic system for the polymerization of olefins, wherein an organo-magnesium-aluminum reaction product is formed in a liquid medium of a halogenated alkylated magnesium compound or an alkylated magnesium compound with an organoaluminum compound, the reaction product being then subjected to a chlorination and to a treatment with a transition metal component selected from the group consisting of Ti, V, Zr and Cr, characterized by using as an organo-aluminum compound, at least one aluminoxane compound of the formula ##STR3## wherein R' designates an alkyl radical of from C.sub.1 to C.sub.16, the R"s form together a bivalent --O-- radical or designate each an R' radical and n is an integer from 0 to 20.
Dependencies are inferred from the claim text.