CATALYTIC PRODUCT FOR STEREOSPECIFIC POLYMERIZATION ALPHA-OLERINS, METHOD FOR ITS PREPARATION AND METHOD FOR STEREOSPECIFIC POLYMERIZATION OF POLYPROPYLENE

摘要

Catalytic solids based on complexed titanium trichloride, which can be employed for the stereospecific polymerisation of alpha-olefins preactivated by being brought into contact with an organoaluminium preactivator comprising the product of reaction of a compound (a) chosen from organoaluminium compounds and of a compound (b) chosen from hydroxyaromatic compounds in which the hydroxyl group is sterically blocked. These solids enable propylene to be polymerised with an improved stereospecificity.