| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition excellent in mechanical strength such as shock resistance, hardness, rigidity, moldability, heat resistance and resistance to metallic hazard. SOLUTION: This resin composition comprises 100 pts.wt. of the resin components with a melt flow rate(MFR) of 15-40g/10min and containing (A) 50-75 pts.wt. of a propylene-ethylene block copolymer containing (i) 5-20wt.% of a polypropylene-ethylene copolymer (having an intrinsic viscosity of 3-5dl/g and an ethylene content of 30-50wt.% in the copolymerization part) (ii) 95-80wt.% of a propylene homopolymer satisfying the formula:ΔHm >=24.5+1.583log MFR whereΔHm is the heat of fusion, (B) 25-50 pts.wt. of talc with an average particle size of <=5μm, (C) 0.01-2 pts.wt. per 100 pts.wt. of the resin components (A and B), of an antioxidant and (D) 0.01-2 pts.wt. of a metal deactivator.
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