Titanium trichloride catalytic component and method for homo-or co-polymerization of α-olefin

Abstract

Abstract A titanium trichloride catalytic component suitable for preparing highly stereospecific polymers having highly uniform particle diameters from α-olefins is prepared by precipitating such catalytic component from a solution of TiCl 4 in a solvent comprising a saturated aliphatic hydrocarbon and/or an alicyclic hydrocarbon. Such solution is obtained by dissolving TiCl 4 , an ether and an organo-aluminum compound having the formula AlR n X 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° C. in the concomitant presence of an aromatic hydrocarbon halide; subsequently, the temperature of the resulting system is raised to 45°-150° C. over a period of 10 minutes to 24 hours to precipitate the catalytic component which has a uniform particle diameter between 10 and 1000μ. Homo- or co-polymerization of α-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 2 H 5 ) 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.

Inventors

• 👤 Yoshikazu Takahashi
• 👤 Yoichi Sunada
• 👤 Masaru Takitani

Bibliographic Details