| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester block copolymer resin composition excellent in moldability and impact resistance.SOLUTION: A resin composition includes 50-80 wt.% of polyester block copolymer (A) comprising a high melting point crystalline polymer segment (a1) composed of crystalline aromatic polyester; and a low melting point polymer segment (a2) comprising an aliphatic polyether unit and/or aliphatic polyester unit; and 20-50 wt.% of hard resin (B). This polyester block copolymer resin composition further satisfies the following conditions (1)-(4): (1) the viscosity (Pa s) is 40 or less, (2) the isothermal crystallization time is 1.0 min or less, (3) the ductile breaking is shown under the conditions of test speed 10 m/s, striker diameter 1/2 inch, and test temperature -30°C, and the breaking energy is 20J or more, as measured by the high-speed surface impact test according to ASTM D3763, and (4) the bending modulus measured at 23°C according to ASTM D256 is 400 MPa or more. |
