| 摘要 |
PROBLEM TO BE SOLVED: To obtain a thermoplastic polymer composition which is light in weight, excellent in processability in injection molding, good in appearance, flexural modulus, surface hardness and suitable for injection molded products such as car interior parts. SOLUTION: This composition comprises (A) 61-87 pts.wt. of a propylene- ethylene block copolymer having an MFR of 30-60g/10min, the MFR of the propylene homopolymer portion of 50-90g/10min, the MFR of the isotactic pentad fraction of >=0.97, (B) 5-15 pts.wt. of an ethylene-α-olefin copolymer with a melting point of 60-100 deg.C and an MFR of 3-10g/10min, and (C) 8-14 pts.wt. of talc with particle sizes of <=5μm and a specific surface area of >=3.5m<2> /g, where the components B+C is 13-25 pts.wt. and the physical properties of the composition are as follows: MFR, >=23g/10min; flexural modulus, >=20,000kg/cm<2> ; Izod impact value, >=5kg.cm/cm; Rockwell hardness, >=85 and brittle temperature, <=15 deg.C.
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