| abstract |
Catalytic systems comprising on the one hand a catalytic solid based on complexed titanium trichloride, and on the other hand a non-halogenated organoaluminum activator.n n n Used in gas phase polymerization processes of olefins, these catalytic systems make it possible to manufacture a wide range of homopolymers and copolymers (statistical and block), with an isotacticity index adjustable up to very low values and excellent flowability, even for copolymers with a high comonomer content.n n n They also make it possible, in the absence of transfer agents, to synthesize with increased activity polymers of very high molecular weights.n n n These polymerization processes give particularly advantageous results in the case of propylene. |