POLYPROPYLENE RESIN COMPOSITION

摘要

A polypropylene resin composition including (A) 50-90 parts by weight of a polypropylene resin including (a) 3-30 weight % of stereoblock polypropylene having a weight-average molecular weight of 5,000-1,000,000, a percentage of five continuous propylene monomer units in which all propylene bonds are meso bonds and a percentage of five continuous propylene monomer units in which all propylene bonds are racemic bonds being 70% or more and 5% or more, respectively relative to the all propylene bonds, and (b) 70-97 weight % of an ultra-high stereospecific polypropylene having a melt flow rate of 0.1-1,000 g/10 minutes, an average meso chain length Nm calculated from a triad percentage determined from 13C-NMR spectrum by the following formula of Nm = 2¢mm! / ¢mr! + 1, wherein ¢mm! is (isotactic triad / total triad) x 100 (%) and ¢mr! is (heterotactic triad / total triad) x 100 (%), meeting a relation of Nm > 250 + 29.5 log (MFR), and (B) 50-10 parts by weight of an olefinic rubber and/or a polyolefin other than (A).