| 摘要 |
PURPOSE:To obtain a high-quality copolymer giving a molded article free from the clouding and stickiness of the surface, in high efficiency, by copolymerizing propylene and ethylene under the polymerization condition comprising specific polymerization temperature, catalyst and catalyst composition. CONSTITUTION:A stereo-regular copolymer soluble in illuminating kerosine at 30 deg.C, having an atactic component accounting for <=15(wt)% of the whole copolymer and an ethylene content of <=6%, is produced by polymerizing propylene with ethylene under specific polymerization temperature, catalyst and catalyst composition to give a polymer having a natural logarithm o the ratio of the intrinsic viscosity numbers of the 30 deg.C kerosine-soluble component to that of the insoluble component of >=-0.36 measured in tetralin solution at 135 deg.C, when polymerized at a propylene/ethylene ratio of 50/50wt. EFFECT:The physical properties can be determined by the small-scale test and the condition to give excellent physical properties can be obtained.
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