| 摘要 |
<p>Catalyst systems comprising, on the one hand, a catalytic solid based on complexed titanium trichloride and, on the other hand, a nonhalogenated organoaluminium activator. Employed in gas phase olefin polymerisation processes, these catalyst systems make it possible to manufacture a wide range of homopolymers and copolymers (random and block), with an isotacticity index capable of being adjusted to very low values and with excellent pourability, even in the case of copolymers with a high content of comonomer. They also make it possible, in the absence of transfer agents, to synthesise polymers of very high molecular masses, with an increased activity. These polymerisation processes give particularly advantageous results in the case of propylene.</p> |
