Polypropylene block copolymer resin and compositions

摘要

PCT No. PCT/JP92/00807 Sec. 371 Date Feb. 26, 1993 Sec. 102(e) Date Feb. 26, 1993 PCT Filed Jun. 25, 1992 PCT Pub. No. WO93/00375 PCT Pub. Date Jan. 7, 1993.Polypropylene based resins and compositions comprising the resin having extremely high stiffness, heat resistance and impact strength, with these properties being well-balanced, are provided. The polypropylene based resins are characterized by comprising: (1) a propylene polymer having a content of alpha-olefin other than propylene of not more than 4 mole percent, and the following properties (2), (3) and (4): (2) a pentad fraction (mmmm fraction) measured by 13C-NMR of not less than 96.0 percent, (3) a main elution fraction peak position of not less than 118.0 DEG C. and a peak half value width of less than 4.0, these values being measured by the temperature raising separation method, and (4) an intrinsic viscosity of not less than 0.5 dl/g, but not more than 5.0 dl/g; and, (5) a rubber content measured by pulse NMR of more than 25 percent.