Titanium trichloride catalytic component and method for homo-or

Details Titanium trichloride catalytic component and method for homo-or Titanium trichloride catalytic component and method for homo-or

1978-12-20

1980-11-25

Garvin, Patrick

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

526142, 526144, C08F 464

Patent

active

042357454

ABSTRACT:
A titanium trichloride catalytic component suitable for preparing highly stereospecific polymers having highly uniform particle diameters from .alpha.-olefins is prepared by precipitating such catalytic component from a solution of TiCl.sub.4 in a solvent comprising a saturated aliphatic hydrocarbon and/or an alicyclic hydrocarbon. Such solution is obtained by dissolving TiCl.sub.4, an ether and an organo-aluminum compound having the formula AlR.sub.n X.sub.3-n (wherein R, X and n are as defined hereinafter) in the solvent. The organo-aluminum compound is added at a solvent temperature not exceeding 55.degree. C. in the concomitant presence of an aromatic hydrocarbon halide; subsequently, the temperature of the resulting system is raised to 45.degree.-150.degree. C. over a period of 10 minutes to 24 hours to precipitate the catalytic component which has a uniform particle diameter between 10 and 1000.mu..
Homo- or co-polymerization of .alpha.-olefins is carried out in the presence of a catalyst system consisting of the above-described titanium trichloride catalytic component and an organo-aluminum compound (e.g., (C.sub.2 H.sub.5).sub.2 AlCl) to yield such polymers having highly uniform particle diameters and which are sufficiently pure to permit the omission or simplification of the conventional de-ashing and washing steps.

REFERENCES:
patent: 3094568 (1963-06-01), Hay et al.
patent: 3825524 (1974-07-01), Wada et al.
patent: 4123387 (1978-10-01), Shiga et al.

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