Optical thin films

Abstract

The present invention aims to provide an optical film with excellent low moisture permeability and scratch resistance, suitable for use as a protective film for polarizing plates. The optical film 10 of the present invention has a laminated structure in which a resin layer 1 is formed on one area layer of a light-transmitting substrate 2. The resin layer 1 is formed from a cured product of a curable composition, which comprises at least one polymeric compound selected from the group consisting of monomers having polymeric functional groups and oligomers having polymeric functional groups. Regarding the optical film 10, before and after the scratch resistance test described below, the change in moisture permeability [g / m²・24h] of the aforementioned optical film at a temperature of 40°C and a relative humidity of 92% is less than 20. • The scratch resistance test uses steel wool to be passed back and forth 10 times on the surface of the aforementioned resin layer under a load of 3.92 N and a moving speed of 100 mm / s.

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