Catalysts for stereospecifically polymerizing olefins and process for preparing same.

摘要

Process for preparing a solid catalyst component based on titanium trichloride, useful to polymerize stereospecifically olefins, comprising the following operations:
1) preparing a suspension of finely dispersed siliceous material of the diatomite type (diatomaceous earth) in a mixture of inert hydrocarbon solvent and of TiCl4;
2) reducing TiCl4 in said mixture to TiCl3 with aluminium-organic compound at low temperature;
3) washing the solid catalytic component so obtained with a hydrocarbon solvent, optionally after an activation step at 40 DEG -150 DEG C in the presence of an ether as complexing agent.