POLYMERIZATION OF α-OLEFINS WITH THE SUPPORTED ZIEGLER TYPE CATALYSTS; INFLUENCE OF THE CRYSTALLINE STRUCTURE OF THE CATALYSTS ON THE ISOTACTICITY OF POLYPROPYLENE

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Abstract
Various transition metal compounds were supported on magnesium hydroxide and propylene polymerization was carried out by using them as catalyst. The isotacticity of polypropylene was remarkably increased in comparison with that obtained with the use of carrier free catalyst, from which it has been concluded that the stereoregulation of polymer is mainly based on the crystalline structure of the catalyst not on the transition metal compound.