Catalyst for polymerisation of olefins - by mixing porous silicon dioxide particles with dissolved magnesium cpd. and mixing solid. prod. with titanium or vanadium cpd.

摘要

Catalyst component for use in Ziegler catalyst systems for the polymerisation olefins is prepd. by (a) mixing (1) porous silicon dioxide particles and (2) a Mg cpd. dissolved in an organic solvent, the wt. ratio (1)/(2) being 1/0.01-0.25. and (b) mixing (3) the solid prod. from stage (a) with (4) a V or Ti deriv. in the liq. or solid state, or dissolved in an organic solvent, the wt. ratio (3)/(4) being 1/0.01-20. Cpd. (1) has a particle size of 1-1000 mu, a pore volume of 0.3-3 cm3/g., and an active surface of 100-1000 m2/g. Catalyst gives a high polymer yield. The polymer has a low halogen content. Polymsn. can be effected in dry phase at relatively low temps. Morphological properties of the polymer can be controlled. In particular, polymer having a uniform particle size and high apparent density can be obtd.