Olefin polymerisation titanium tri:chloride ziegler catalyst component - conditioned by wetting with alkane and benzene or alkylbenzene mixt. and drying

摘要

TiCl3 componens for Ziegler-Natta polymerisation catalysts are prepd. by (1) wetting a standard catalyst component consisting of or contg. TiCl3 with hydrocarbon mixt. contg. (A) 100 pts. vol. pentane, hexane and/or heptane and (B) 10-1000 pts. wt. benzene or alkylbenzene having b. pt. 80-270 degrees C under standard conditions, provided catalyst component: wetting hydrocarbon mixt. is 1: x (where x is no. 0.01-0.5) and (2) drying under constant mixing. The catalyst components are used in alpha-olefin polymerisation, in gas- or liq. phase. The polymers have optimum morphological properties, e.g. narrow grain-size distribution. Catalyst component conditioning suppresses the formation of very fine grains having dia. 200 mu. Alkaline (A) is esp. n-hexane or n-heptane. The benzene hydrocarbon (B) is esp. toluene, a xylene or ethylbenzene. (B) can be a light oil mixt. having b. pt. 80-170 degrees c. Drying can take place (a) under an inert gas, in a rotary evaporator, for 0.5-5 hrs., under pressure 0.9-1.1 bar, at 5-50 degrees C above the highest-boiling hydrocarbon b. pt., or (b) in a ball mill under increasing vacuum.