Importance

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Abstract

An object of the invention is to provide foaming polypropylene resin compositions that are suited for injection foam molding, have excellent balance between flowability and melt tension, are foamable at high expansion ratio, and can give lightweight molded foams having excellent appearance and mechanical strength. Another object is to provide injection-molded foams using the compositions.A foaming polypropylene resin composition of the invention includes: 50 to 90 parts by weight of a high-molecular weight component-containing impact polypropylene (AB); 10 to 30 parts by weight of a rubber component (C); and 0 to 20 parts by weight of an inorganic filler (D) (wherein the total of (AB), (C) and (D) is 100 parts by weight); and the high-molecular weight component-containing impact polypropylene (AB) contains 4.5 to 31.0 wt % of a propylene/ethylene copolymer that is identified as a normal temperature paraxylene soluble component, and the high-molecular weight component-containing impact polypropylene (AB) contains 0.2 to 3.7 wt % of a propylene polymer component having an intrinsic viscosity [η] at 135° C. in tetralin of 13.5 to 20.0 dl/g.

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First Claim