| 摘要 |
<p>Fractionable, reactor blend polypropylenes, directly obtainable from the polymerization reaction of propylene, having: (a) content of isotactic pentads (mmmm) comprised between 25 and 85 %; (b) ratio Mw/Mn < 5; containing from 10 to 70 % by weight of a fraction soluble in boiling diethyl ether, said fraction having a content of isotactic pentads (mmmm) comprised between 5 and 25 %, and from 30 to 90 % by weight of a boiling n-heptane-insoluble fraction, soluble in xylene at 135 °C, said fraction having a content of isotactic pentads (mmmm) comprised between 50 and 99 %, are disclosed. These polymers are suitable as thermoplastic-elastomeric materials. A process for the preparation of these polymers and a process for the preparation of 2-aryl-substituted indenyl metallocene ligands is also disclosed.</p> |
