| 摘要 |
Disclosed are a propylene polymer having a high crystallinity of a boiled heptane-insoluble component contained therein, a high stereoregularity and an extremely long mesochain (continuous propylene units wherein directions of alpha-methyl carbons are the same as each other), and a process for preparing said polymer. Further disclosed is a propylene polymer composition comprising the above propylene polymer and at least one stabilizer selected from a phenol type stabilizer, an organophosphite type stabilizer, a thioether type stabilizer, a hindered amine type stabilizer a metallic salt of higher aliphatic acid. The propylene block polymer of the invention is well-balanced between rigidity, heat resistance and moisture resistance, and can be favorably used for sheet, filament, injection molded product, blow molded product, etc. The propylene polymer composition of the invention has excellent properties of the propylene polymer of or the propylene block copolymer, and moreover is excellent in heat stability during the molding stage, long-term heat stability and weathering resistance. The propylene polymer composition can be favorably used for sheet, film, filament, injection mold product, blow molded product, etc.
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