| abstract |
A process for homopolymerizing propylene or copolymerizing propylene with other unsaturated hydrocarbon, which comprises conducting polymerization in liquid-phase propylene using a catalyst system composed of a transition metal or the complex thereof, an organoaluminum compound, and an electron donor supported on magnesium halide, contacting the resulting polymerization slurry with a C 3-8 alcohol and liquid-phase propylene in a countercurrent washing tower to deactivate the catalyst and remove a soluble polymer and the catalyst in the polymerization slurry. This process enables to simplify the production steps, and the catalyst shows a large initial activity and such a high efficiency that the polymer yield per carrier weight is high. The resulting polymer has high purity and has a sufficient stereospecificity and excellent rigidity and filming properties. |