POLYPROPYLENE RESIN COMPOSITION AND FILM THEREOF

摘要

A polypropylene resin composition comprising by weight 40 to 80% of a polypropylene component A comprising a copolymer of propylene with ethylene and/or a C4-12 alpha-olefin, or a homopolymer of propylene, and 20 to 60% of a copolymer component B containing a copolymer B-1 and a copolymer B-2, wherein both B-1 and B-2 are copolymers of propylene with ethylene and/or a C4-12 alpha-olefin, in B-1 the amount of units derived from propylene is from more than 50% by weight to 85% by weight, and in B-2 the amount of units derived from propylene is 15 to 50% by weight, the molecular weight distribution Mw/Mn is 3.0 or less, and blockness CSD determined using the measured NMR values is 1.3 or less in which composition the amount of B-2 with respect to the whole polypropylene resin composition is 3% or more, and the ratio of the limiting viscosity of B-1 to the viscosity of A [eta]B-1/[eta]A is 1.5 or less, and the ratio of the limiting viscosity of B-1 to the viscosity of B-2 [eta]B-1/[eta]B-2 is 0.8 or more.