| 摘要 |
PROBLEM TO BE SOLVED: To provide a polypropylene composition comprising a crystalline ethylene/propylene copolymer component and a crystalline polypropylene component, which is suitable as a base resin for polypropylene molded products having an excellent transparency, rigidity, heat resistance, impact resistance, etc., and showing no surface stickiness. SOLUTION: The titled composition comprises 5 to 95 wt.% crystalline propylene polymer(PP) component containing 90 mol% or more propylene-derived polymer units wherein 0.05 mol% or more 2,1- and 1,3-bonds are present in the propylene polymer unit, and 95 to 5 wt.% crystalline ethylene/propylene copolymer(EP) component comprising ethylene and propylene which contains 70 to 95 mol% ethylene-derived polymer units. A polypropylene composition is prepared through a two-step polymerization process utilizing a metallocene- supporting solid catalyst suitable for preparing crystalline propylene polymers.
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