Patent ID: 8946331
Filing Date: 2015-02-03
Classification: C08F,C08L

Abstract:
1. A polypropylene resin composition comprising: (A) a propylene-based block copolymer satisfying requirements (a), (b), (c) and (d) defined below, and (B) from 0.01 to 1.0 part by weight, based on 100 parts by weight of (A), of aluminum hydroxy-di-(p-tert-butylbenzoate) particles having an average particle diameter, as measured by the laser diffraction method, of from 0.01 to 3 μm wherein particles having particle diameters of not less than 10 μm account for less than 5% by weight of all the particles of aluminum hydroxy-di-(p-tert-butylbenzoate); requirement (a): propylene-based block copolymer (A) is a propylene-based block copolymer including a polymer component (I) and a polymer component (II), wherein the polymer component (I) is a propylene polymer having an intrinsic viscosity as measured in Tetralin at 135° C., of from 0.1 to 5 dl/g and the polymer component (II) is a propylene polymer comprising propylene units and units of at least one comonomer selected from the group consisting of ethylene and α-olefins having 4-12 carbon atoms and having an intrinsic viscosity [η] requirement (b): the polymer component (I) has an isotactic pentad fraction, as measured by requirement (c): the content of the units derived from at least one comonomer selected from the group consisting of ethylene and α-olefins having 4-12 carbon atoms included in the polymer component (II) is from 1 to 80% by weight, provided that the overall amount of the polymer component (II) is 100% by weight, and requirement (d): the content of the polymer component (II) is from 1 to 70% by weight, provided that the weight of the propylene-based block copolymer (A) is 100% by weight, wherein the polymer component (I) is a propylene-based polymer component composed of from 0.01 to 30% by weight, based on the overall amount of the polymer component (I), of units derived from at least one comonomer selected from the group consisting of ethylene and α-olefin having 4-12 carbon atoms and units derived from propylene and the content of 20° C. xylene-soluble component in the polymer component (I) less than 1.0% by weight.