OPTICAL FILM AND METHOD FOR MANUFACTURING THE SAME, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an optical film having excellent durability and capable of reducing moisture permeability.SOLUTION: The optical film includes a base film comprising a thermoplastic resin and a low moisture permeable layer deposited on the base film; and the film has a moisture permeability of 200 g/m/day or less and satisfies an expression (1):A/B≤0.9. In the expression, A represents a moisture permeability of the optical film having the low moisture permeable layer deposited on the base film comprising the thermoplastic resin; B represents a moisture permeability of the base film comprising the thermoplastic resin; and the permeability is measured after the film is kept at 40°C and 90% relative humidity for 24 hours, in accordance with the procedure specified by JIS 0208.