| 摘要 |
PROBLEM TO BE SOLVED: To provide a propylene-based resin film high in impact resistance and excellent in transparency and blocking resistance, etc. SOLUTION: The propylene-based resin film meets the following requirements (A-i) to (A-iv): (A-i) It consists of a propylene-ethylene random block copolymer comprising 30-85 wt.% of (A1) a component obtained in a first step, 0.5-6 wt.% in ethylene content, synthesized using a metallocene-based catalyst and 70-15 wt.% of (A2) a component obtained in a second step, containing an ethylene component more than the component (A1) by 6-18 wt.%. (A-ii) In the TREF (temperature rising elution fractionation) elution curve, the peak T (A1) at higher temperature side falls within the range from 55°C to 96°C, while the peak T (A2) at lower temperature side falls below 45°C, and the temperature T (A4) at which 99 wt.% of the whole block copolymer is eluted is below 98°C. (A-iii) The MFR falls within the range of 1-50 g/10 min. (A-iv) The tanδcurve determined by solid viscoelasticity measurement has a single peak below 0°C. COPYRIGHT: (C)2007,JPO&INPIT
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