Effect of Titanium-Magnesium Catalyst Morphology on the Properties of Polypropylene upon Propylene Polymerization in a Liquid Monomer

The effect of the particle size of an IK-8-21 domestic titanium-magnesium catalyst on the properties of polypropylene (PP) produced during the polymerization of propylene in a liquid monomer is studied. Catalysts with particle sizes of 20 to 64 mu m are shown to have high activity and identical sensitivity to hydrogen and allow PP to be obtained with a narrow distribution of particles over size, high isotacticity, and close values of crystallinity, melting temperature, and physicomechanical properties. A slight decrease in the activity and bulk density of PP powder is observed when the average size of catalyst particles is increased from 20 to 43 mu m. A more notable reduction in the activity and bulk density of PP powder is observed for catalyst with particle sizes of 62 to 64 mu m. IK-8-21 catalyst is not inferior to its foreign analogues with respect to the properties of the resulting PP.