Alpha-olefin polymerisation catalyst containing an organo:aluminium and an electron donor compound

摘要

A solid catalyst component (X) used for alpha -olefin polymerisation has a particle size distribution of at least 6 (expressed as a value N for a Rosin-Rammler particle size distribution function) and a catalytic activity of at least 10000 g polymer per g solid catalyst per hour. Also claimed are: (1) solid catalyst components (Y) for alpha -olefin polymerisation containing trivalent titanium compounds; (2) alpha -olefin polymerisation catalysts (Z) comprising a component (Y), organoaluminium compound and electron donor compound; and (3) the preparation of poly- alpha -olefin(s) by polymerisation of alpha -olefin(s) using (Z).