EASILY-ADHESIVE POLYESTER FILM FOR OPTICAL USE

摘要

PROBLEM TO BE SOLVED: To obtain a polyester film having high transparency by suppressing fine defects generated in a film-forming process and blocking resistance and excellent in adhesion and resistance to moist heat.

SOLUTION: The easily-adhesive polyester film for optical use is a polyester film having a coating layer at least one surface of a substrate film. The coating layer includes a polycarbonate-based urethane resin and a resin having an oxazoline group as principal components and contains 0.5-4.0 mmol/g of the oxazoline group. The substrate film is a polyester film having laminate structure with three or more layers comprising the outermost layer and at least one central layer. The outermost layer contains inert particles having an average particle diameter of 2.1-2.5 μm and has a thickness 5 times or more and less than 11 times higher than the average particle diameter of the inert particles. On the surface of the outermost layer, the rate of the surface projections having a ratio L/h of the diameter L of the surface projection to the height h thereof of 50 or less is 30% or less of the surface projections having a height of 2 nm or more observed with an atomic force microscope (AFM).

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