| 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) and the step (b) of producing an ethylene copolymer (b) 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 step (b), of the polymer produced in the preceding step (a), in which process the obtained polymer composition contains 20-90 wt. % of the (co)polymer (a) and 80-10 wt. % of the copolymer (b) 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> |
