| 摘要 |
PROBLEM TO BE SOLVED: To provide a crystalline polypropylene having excellent moldability and rigidity both of which are kept in good balance. SOLUTION: This polypropylene is a crystalline polypropylene which satisfies the following requirements (1) to (3):(1) 0.5<MFR<200 wherein MFR represents a melt flow rate, (2) 90<HI wherein HI represents a weight ratio of the residue after extraction with boiling n-heptane for 6 hours by means of a modified Soxhlet extcactor to the total polymer, and (3) 5 or mare in terms of the value of B in the formula: B=12.74×log (I)+2.997×log(G)-41.70 [wherein I represents a density of supherulite nuclei formed (unit: number/m<3> ) and G represents a growth rate for a (a increasing rate for a supherulite radius, unit:μm/min) wherein both of I and G are measured in the isothermal crystallization at 135 deg.C].
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