CELLULOSE ACYLATE FILM AND ITS MANUFACTURING METHOD, POLARIZATION PLATE, OPTICAL COMPENSATION FILM FOR LIQUID CRYSTAL DISPLAY PLATE, ANTI-REFLECTION FILM AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a cellulose acylate film reduced not only in the irregulality (distribution) of Re and Rth within a film plane due to the variation of environmental humidity but also in a change in a moist heat dimensional change and hardly occurring display irregularity at the time of a change in an environmental temperature when used as a liquid crystal display device.

SOLUTION: The cellulose acylate film having a composition containing 1-25 mass% of a plasticizer is laterally stretched at preheating temperature>stretching temperature in the relation of preheating length/stretching zone=0.1-10. After the cellulose acylate film is laterally stretched under a condition of 0≤X≤2.5 and 2.1≤X+Y≤3.0 X is an acetyl group, Y is at least a substituent selected from a propionyl group, a butyril group and a phthaloyl group and thermally fixed at stretching temperature>thermal fixing temperature under a condition of thermal fixing zone length/stretching zone length=0.1-10.

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