| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a biaxially oriented polyethylene terephthalate film for polarization plate release having excellent contrast, break resistance, optical axis accuracy and thermal dimensional stability, with little haze variation due to heat treatment. <P>SOLUTION: The biaxially oriented polyethylene terephthalate film satisfies the following structural requirements (1)-(5): (1) 2.0% or less of a thermal shrinkage in both the longitudinal direction and the width direction when heated at 150°C for 30 min., (2) 1.0% or less of a difference in thermal shrinkages in the longitudinal direction and width direction when heated at 150°C for 30 min., (3) 1.80-2.10 of an MOR (Maximum Oriented Ratio) value measured with a microwave transmission type molecule orientation meter, (4) 3.0-5.0°per 500 mm of variation of an orientation angle in the film width direction, (5) 0.1% or less of the haze variation after heat treatment at 170°C for 20 min. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
