| 摘要 |
An automobile part comprising a polypropylene resin composition, the polypropylene resin composition comprising a propylene homopolymer (A1), an elastomer (B) and an inorganic filler (C), or comprising a propylene block copolymer (A2) and an inorganic filler (C) optionally together with an elastomer (B), in specified proportions. The propylene homopolymer (A1), or the propylene homopolymer segment of the propylene block copolymer (A2) exhibits an MFR (230 DEG C) of 20 to 300 g/10 min, a ratio of position irregular units derived from 2,1-insertion or 1,3-insertion of propylene monomer relative to all propylene structural units, determined from a <13>C-NMR spectrum, each of 0.2% or less, and an Mw/Mn, determined by GPC, of 1 to 3. The present invention enables providing an automobile part (including an injection molded article) which has an excellent balance of rigidity and impact resistance, on which the possibility of flow marks is low and, even if flow marks occur, they are not conspicuous, and which realizes an excellent emboss transfer on molded article surface to thereby have an excellent appearance. The polypropylene resin composition for use in the present invention has the above formulation, so that the time required for plasticization is short. Consequently, the molding cycle for producing an injection molded article can be shortened to thereby accomplish efficient production of an injection molded automobile part capable of realizing the above effects.
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