| 摘要 |
PURPOSE:To produce a propylene copolymer which is improved in transparency and can give a molding free of surface clouding and stickiness, by bulk- polymerizing propylene and ethylene in the presence of an aromatic hydrocarbon compound by using the propylene itself as a liquid medium and using modified titanium trichloride and a specified dialkylauminum halide. CONSTITUTION:A propylene copolymer is produced by bulk-polymerizing propylene and ethylene by using the propylene itself as a medium and using titanium trichloride modified with an oxygen-containing organic compound and a dialkylaluminum halide. Said copolymerization is performed by using a dialkylaluminum halide having a halide to aluminum atomic ratio of 0.90-1.10 in the presence of 1-20vol%, based on the entire volume of the liquid medium, 6-10 C aromatic hydrocarbon compound so that ethylene and/or its mixture with a 4-6 C alpha-olefin may account for 10wt% based on the total copolymer. The copolymer slurry is washed countercurrently with propylene to obtain a propylene copolymer of excellent transparency.
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