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 extractor to the total polymer, and (3) 5 or more in terms of the value of A in the formula : A=0.8209×log (I) +9.481×log(G)+0.1616×(CT)-23.15 [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), and CT represents the temperature ( deg.C), as determined by differential scanning calorimetry, at which supherulite nuclei are formed wherein both of I and G are measured in the isothermal crystallization at 135 deg.C].
|