| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composition excellent in rigidity, impact resistance, transparency and slight whitening properties of molding. SOLUTION: The propylene-based copolymer composition is shown by the composition formula (Ppx .Ety )p .Ppq .Etr (Et is ethylene unit; Pp is propylene unit; (Ppx .Ety ) is a propylene-ethylene/random copolymer block unit; (x), (y), (p) and (q) respectively show composition relationship of 0.5/95<=x/y<=5/95, 85/15>=q/r>=65/35 and 80/20<=p/(q+p)<=(95/5). The copolymerization block unit has relationship between a boiling n-pentane extraction ratio (W<1> ext ) and ethylene content (W<1> c2 ) of W<1> ext /W<1> c2 <=0.90 and relationship between its intrinsic viscosity ([η]PP) and intrinsic viscosity ([η]RC) of a unit except the copolymer block of 0.5<=[η]RC/[η]PP<=2.0. The propylene-based copolymer composition has 0.01-50g/10 minutes melt flow index.
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