CELLULOSE ACYLATE FILM, ITS MANUFACTURING METHOD, RETARDATION FILM, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a cellulose acylate film superior in conveying properties even at a high temperature, and satisfactory in surface state even after heat treatment.

SOLUTION: The cellulose acylate film satisfies formulae (I) and (II). The formula (I) is 1.01≤E'(//)/E'(⊥)≤1.30 and the formula (II) is 5≤σ240(20%)≤100, wherein E'(//) is a tensile elastic modulus (unit; MPa) in a direction in which the tensile elastic modulus (unit; MPa) becomes maximum at 25°C in the plane, E'(⊥) is tensile elastic modulus (unit; MPa) in a direction crossing the measuring direction of E'(//) at right angles, and σ240expresses a tensile stress (unit; N/mm2) when being stretched 20% at 240°C in a direction in which the tensile elastic modulus at 25°C becomes maximum in the plane.

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