| 摘要 |
<p>A process for producing a propylene polymer composition by conducting a multi-stage polymerization comprising the step (a) of producing a propylene (CO) polymer (a), the step (b) of producing a propylene-olefin copolymer (b), and the step (c) of producing an ethylene-olefin copolymer (c) in an arbitrary order in the presence of a transition metal compound (A) containing a ligand having a cyclopentadienyl skeleton and a compound (B) capable of activating the compound (A) and also in the presence, in the steps (b) and (c) of the polymers produced in the preceding steps, in which process the obtained polymer composition contains 20-90 wt.% of the co(polymer) (a), 5-75 wt.% of the copolymer (b), and 5-75 wt.% of the copolymer (c) and has a melt flow rate of 0.01-500 g/10 min. as measured at a temperature of 230 °C under a load of 2.16 kg. This process can provide a propylene polymer composition having an excellent balance among rigidity, heat resistance and impact resistance.</p> |
