Thermoplastic resin composition

An automobile exterior trim material comprising:

• (I) 25-35% by weight of a mixture of (a) 10-50% by weight of a propylene homopolymer and/or an ethylene-propylene block copolymer (an isotactic pentad fraction of a propylene homopolymer portion being 0.98 or above) and (b) 50-90% by weight of an olefin-based copolymer rubber, said mixture having been dynamically heat treated in the presence of an organic peroxide and a crosslinking agent;
• (II) 43-70% by weight of a propylene homopolymer and/or an ethylene-propylene block copolymer (a melt index (JIS-K-6758, 230.degree. C.) of a propylene homopolymer portion being 30-150 g/10 min, and an isotactic pentad fraction of the propylene homopolymer portion being 0.98 or above);
• and
• (III) 5-22% by weight of an inorganic filler.

An automobile exterior trim material with excellent heat resistance comprising:

• (I) 16-22% by weight of a mixture of (a) 20-40% by weight of a propylene homopolymer and/or an ethylene-propylene block copolymer (an isotactic pentad fraction of a propylene homopolymer portion being 0.98 or above) and (b) 60-80% by weight of an olefin-based copolymer rubber, said mixture having been dynamically heat treated in the presence of an organic peroxide and a crosslinking agent;
• (II) 56-66% by weight of a propylene homopolymer and/or an ethylene-propylene block copolymer (a melt index (JIS-K-6758, 230.degree. C.) of a propylene homopolymer portion being 30-150 g/10 min, and an isotactic pentad fraction of the propylene homopolymer portion being 0.98 or above);
• and
• (III) 18-22% by weight of an inorganic filler.

An automobile interior trim material comprising:

• (I) 10-15% by weight of a mixture of (a) 10-50% by weight of a propylene homopolymer and/or an ethylene-propylene block copolymer (an isotactic pentad fraction of a propylene homopolymer portion being 0.98 or above) and (b) 50-90% by weight of an olefin-based copolymer rubber, said mixture having been dynamically heat treated in the presence of an organic peroxide and a crosslinking agent;
• (II) 71-84% by weight of a propylene homopolymer and/or an ethylene-propylene block copolymer (an isotactic pentad fraction of a propylene homopolymer portion being 0.98 or above and a melt index (JIS-K-6758, 230.degree. C.) of the propylene homopolymer portion being 30-150 g/10 min);
• and
• (III) 6-14% by weight of an inorganic filler.

An instrumental panel for automobiles comprising:

• (I) 16-22% by weight of a mixture of (a) 10-50% by weight of a propylene homopolymer and/or an ethylene-propylene block copolymer (an isotactic pentad fraction of a propylene homopolymer portion being 0.98 or above) and (b) 50-90% by weight of an olefin-based copolymer rubber, said mixture having been dynamically heat treated in the presence of an organic peroxide and a crosslinking agent;
• (II) 52-66% by weight of a propylene homopolymer and/or an ethylene-propylene block copolymer (an isotactic pentad fraction of a propylene homopolymer portion being 0.98 or above, and a melt index (JIS-K-6758, 230.degree. C.) of the propylene homopolymer portion being 30-150 g/10 min);
• and
• (III) 18-26% by weight of an inorganic filler.