| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polypropylene unstretched film which is excellent in the balance of transparency and rigidity. <P>SOLUTION: The polypropylene unstretched film satisfies all of the following requirements: (1) the density measured by a density gradient tube is at least 0.890 g/cm<SP POS="POST">3</SP>; (2) crystal of α-crystalline form is contained; and (3) the degree of orientation measured by a wide-angle x-ray diffraction method is at least 60%. <P>COPYRIGHT: (C)2012,JPO&INPIT |
