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    • 8. 发明专利
    • Production method for the propylene-based polymer
    • JP5321506B2
    • 2013-10-23
    • JP2010050298
    • 2010-03-08
    • 住友化学株式会社
    • 靖己 藤原
    • C08F297/08C08F4/658
    • PROBLEM TO BE SOLVED: To provide a production method for a propylenic polymer excellent in impact resistance, rigidity and molding processability. SOLUTION: The production method for a propylenic polymer comprises steps of: (I) bringing a solid catalyst component containing a titanium atom, a magnesium atom and a halogen atom, an organoaluminum compound, an external electron donor represented by formula (i), Rsi(OC 2 H 5 ) 3 , and an external electron donor represented by formula (ii), R 2 n Si(OC 2 H 5 ) 4-n , into contact with each other, to produce a polymerization catalyst; (II) homopolymerizing propylene or copolymerizing propylene with other olefins in the presence of the polymerization catalyst to produce a polymer component (1) containing ≥90 wt.% propylene unit and having a limiting viscosity [η] 1 of ≤1.0 dl/g; and (III) copolymerizing propylene with other olefins in the presence of the polymer component (1) to produce a polymer component (2) containing 10-90 wt.% propylene unit and having a limiting viscosity [η] 2 of 1-10 dl/g and of ≥3 times the [η] 1. COPYRIGHT: (C)2011,JPO&INPIT