ANTIREFLECTION FILM AND OPTICAL PRODUCT

摘要

PROBLEM TO BE SOLVED: To provide an antireflection film which has no visibility inferiority by light interference such as an interference fringe, has satisfactory optical performances and excellent surface abrasion resistance and which can be suitably used for an optical product; and further to provide the optical product provided with the antireflection film.

SOLUTION: The antireflection film is provided with a base material film which is constituted by laminating (k) layers of thermoplastic resin layers (wherein (k) is an integer of two or more) and an antireflection layer which is laminated on at least one surface of the base material film. The film satisfies following conditions (1), (2): (1) A refractive index ni(λ) at a wavelength λ within a range between 380 nm and 780 nm in an (i)th thermoplastic resin layer and a refractive index ni+1(λ) at the wavelength λ within a range between 380 nm and 780 nm in an (i+1)th thermoplastic resin layer have a relation, ¾ni(λ)-ni+1(λ)¾≤0.05 at i=1 to k-1. (2) When Aidenotes modulus of tensile elasticity of the (i)th thermoplastic resin layer and Ai+1denotes modulus of tensile elasticity of the (i+1)th thermoplastic resin layer, at least one of i(i=1 to k-1) satisfying a relation, ¾Ai+1-Ai¾≥0.5 GPa, is contained.

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