A polypropylene resin composition comprising (A) a crystalline propylene block copolymer having a content of a room temperature n-decane-soluble portion of 15 to 35% by weight and having MFR of 5 to 80 g/10min, in an amount of 94 to 55%, (B) an elastomeric polymer in an amount of 1 to 20% by weight and (C) an inorganic filler in an amount of 5 to 25% by weight, said composition having the property that a ratio of an Izod impact strength (J/m, IZ250-30) of a specimen obtained by maintaining the composition at 250°C for 30 minutes in a molten state in an injection molding machine and then molding the composition, said Izod impact strength being measured after 48 hours from the molding, to an Izod impact strength (J/m, IZ230-3) of a specimen obtained by maintaining the composition at 230°C for 3 minutes in a molten state in the same injection molding machine and then molding the composition by the same method, said Izod impact strength being measured after 48 hours from the molding, satisfies the following formula: 1.0≥(IZ250−30/IZ230−3)≥0.5.
一种聚
丙烯树脂组合物,包括(A)结晶
丙烯嵌段共聚物,其室温正
癸烷可溶部分含量为 15-35%(重量比),且 MFR 为 5-80g/10min,含量为 94-55%;(B)弹性聚合物,含量为 1-20%(重量比);以及(C)无机填料,含量为 5-25%(重量比)、IZ250-30)与通过在注塑机中将熔融状态的组合物在 250°C 下保持 30 分钟,然后将组合物成型(所述伊佐德冲击强度在成型 48 小时后测量)而获得的试样的伊佐德冲击强度(J/m、在同一注塑机中,将熔融状态下的组合物在 230°C 下保持 3 分钟,然后用同样的方法将组合物成型,在成型 48 小时后测得的试样的伊佐德冲击强度(J/m,IZ230-3)满足下式:1.0≥(IZ250−30/IZ230−3)≥0.5.