C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
252/109, 402/565
C08F 4/642 (2006.01) C08F 10/00 (2006.01) C08F 10/02 (2006.01) C08F 10/14 (2006.01)
Patent
CA 2038330
A supported Ziegler-Natta catalyst active in ethylene polymerization and in the copolymerization of ethylene with alpha- olefins consists of: (A) a cocatalyst in the form of an organometallic compound of aluminium, and (b) a solid catalyst component obtained by: - (i) impregnating a granular solid support with a solution of a titanium alcaholate and magnesium chloride in a liquid aliphatic hydrocarbon, followed by evaporation of the hydrocarbon solvent; - (ii) impregnating the support treated in (i) with a solution of magnesium chloride in a liquid aliphatic ester, followed by evaporation of the ester solvent; and - (iii) activating the support treated in (ii) by contact with an alkyl aluminium halide. In a preferred embodiment, measured quantities of a silicon halide are introduced in stage (i) and/or (ii), this considerably improving catalytic activity. In a particular embodiment, zirconium or hafnium are introduced into the solid catalyst component (B) in addition to titanium, to obtain catalysts able to produce polyethylenes with a widened molecular weight distribution.
Borghi Italo
Invernizzi Renzo
Luciani Luciano
Masi Francesco
Polesello Mario
Montedipe S.r.l.
Robic
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