CELLULOSE ACYLATE FILM, ITS MANUFACTURING PROCESS AND RETARDATION FILM, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY USING THE FILM

摘要

PROBLEM TO BE SOLVED: To provide a cellulose acylate film which exhibits a negative Rth and has little fine foreign materials and variations.

SOLUTION: A cellulose acylate film having positive birefringence is heat-treated at ≥210°C during transportation to make the retardation value in the film thickness direction negative.

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