| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a film for a retort food package which is excellent in transparency, impact-resistance, heat sealing property and heat resistance at satisfactory balance. <P>SOLUTION: The film for the retort food package comprises a propylene-based random block copolymer (A) comprising 90-80 wt.% of a portion (D<SB>insol</SB>) which is insoluble in n-decane at room temperature has been polymerized by a metallocene catalyst system, has a melt flow rate of 1-10 g/10 min and a melting point of 150-155°C and satisfies the following (1)-(3), and 10-20 wt.% of a portion (D<SB>sol</SB>) which is soluble in n-decane at room temperature and satisfies the following (4)-(6). (1) Molecular weight distribution of D<SB>insol</SB>is 1.0-3.5, (2) an ethylene content in D<SB>insol</SB>is 0.5-13 mol%, (3) total of 2,1-insertion bonding amount and 1,3-insertion bonding amount of propylene in D<SB>insol</SB>is 0.2 mol% or less, (4) molecular weigh distribution of D<SB>sol</SB>is 1.0-3.5, (5) intrinsic viscositiy [η] in decalin of 135°C of D<SB>sol</SB>is 1.5-4.0 dL/g, and (6) an ethylene content in D<SB>sol</SB>is 15-35 mol%. <P>COPYRIGHT: (C)2009,JPO&INPIT |
