PROPYLENE RESIN COMPOSITION AND MOLDED ARTICLE THEREOF

摘要

A propylene resin composition prepared by dynamically heat-treating a blend of (A) 100 parts by weight of a propylene- alpha -olefin block copolymer having a ratio ( eta 1/ eta 2) of 3.5 to 8 (wherein eta 1 and eta 2 represent melt viscosities under the shear rate of, respectively, 10<1>sec<-1> and 10<2>sec<-1> as measured by the slit-die method) with (B) 0.005-2 parts by weight of an organic peroxide. The composition has a melt flow rate (as measured at the temperature of 230 DEG C under the load of 2.16 kg according to JIS K7210) of 50-300g/10 mn and a main endothermic peak temperature Tmp of 120-150 DEG C in the melting temperature curve, a main exothermic peak temperature Tcp of 85-105 DEG C in the crystallization temperature curve, and a half width of the Tcp of 5 DEG C or above, each according to differential scanning calorimetry.