Preparation of a component for polymerization catalysts

Details Preparation of a component for polymerization catalysts Preparation of a component for polymerization catalysts

1979-07-12

1980-09-23

Garvin, Patrick

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

526143, C08F 464

Patent

active

042241847

ABSTRACT:
A special process for the preparation of a titanium component for polymerization catalysts of the Ziegler-Natta type, wherein (1) in a first stage (1.1) an alcoholate of the formula Mg(OR).sub.2, where R is lower alkyl, and (1.2) benzoyl chloride are milled together in a particular molar ratio in a vibratory ball mill under particular milling conditions, especially a relatively low temperature, in the absence of a diluent, thereafter (2) in a second stage (2.1) the material resulting from stage (1) is brought together with (2.2) titanium tetrachloride in a particular ratio, the batch is kept at an elevated temperature for some time, with constant mixing, and the resulting solid is isolated, excess titanium tetrachloride being removed, and finally (3) in a third stage (3.1) the solid resulting from stage (2) is again brought together with (3.2) titanium tetrachloride in a particular ratio, the batch is again kept at an elevated temperature for some time, with constant mixing, and the resulting solid, constituting the novel titanium component, is isolated, excess titanium tetrachloride being removed. The novel titanium component permits the preparation of .alpha.-monoolefin polymers in high yield and with high isotacticity.

REFERENCES:
patent: 3317499 (1967-05-01), Nakaguchi et al.
patent: 3380981 (1968-04-01), Miller et al.

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