| 摘要 |
PROBLEM TO BE SOLVED: To provide a polypropylene-based resin film which causes the deterioration of optical characteristics, especially transmittance and transparence even when exposed under high temperature environment and can sufficiently endure even being used under the high temperature environment.SOLUTION: A stretched film is made of a polypropylene-based resin and stretched at the fixed end to the magnification ratio of 1.3 times or more at a temperature of 100°C or higher and 170°C or lower. In the stretched film, the change of a haze value obtained by holding at 100°C for 150 h is 0.5 point or less by the difference of the haze value in % expression. The stretched film can be preferably used as an optical film for a liquid crystal display device, for example, a phase difference film, or a protective film stuck on a polarizing film. |
