The Influence of Morphology of a Ti-Mg Catalyst for Propylene Polymerization in a Liquid Monomer Medium on the Polypropylene Properties

Abstract

The studies were focused on the influence of particle size of the Russian Ti-Mg catalyst IC-8-21 on the properties of polypropylene (PP) synthesized by polymerization of propylene in a liquid monomer medium. The catalysts with particles of 20 to 64 mm in size were shown to be highly active, identically sensitive to hydrogen and to provide synthesis of PP with a narrow particle size distribution, high isotacticity, close values of crystallinity, melting temperature and physicomechanical properties. A minor decrease in the activity and bulk density of PP powder was observed with an increase in the average size of catalyst particles from 20 to 43 mm. The activity and bulk density decreased more considerably over the catalyst with particles of 62–64 mm in size. The properties of polypropylene synthesized over IC-8-21 are not inferior to the properties provided by the known analogues.