Patent ID: 7960018
Filing Date: 2011-06-14
Classification: G02B,Y10T

Abstract:
1. An optical film comprising: a support; a hard coat layer formed by hardening a hard coat layer-coating composition; and an overcoat layer having a thickness of 0.15 to 10 μm formed by hardening an overcoat layer-coating composition, in this order, wherein each of the hard coat layer-coating composition and the overcoat layer-coating composition comprises a compound having a plurality of polymerizable functional groups in one molecule, wherein the compound in the overcoat layer-coating composition comprises a compound having at least three polymerizable functional groups, wherein the optical film further comprises a compositional varying layer having a thickness of from 0.05 to 5 μm between the hard coat layer and the overcoat layer, and a constitutional ratio of at least one of a polymerizable compound and fine particles in the compositional varying layer is same at a surface of (of the compositional varying layer) contacting with the overcoat layer and in the overcoat layer, is same at a surface (of the compositional varying layer) contacting with the hard coat layer and in the hard coat layer, and gradually varies from the surface (of the compositional varying layer) contacting with the overcoat layer to the surface (of the compositional varying layer) contacting with the hard coat layer, wherein a ratio MOC/MHC is from 1.1 to 6.0, wherein MOC is a weight average molecular weight of the compound having the plurality of polymerizable functional groups in one molecule in the overcoat layer-coating composition, and MHC is a weight average molecular weight of the compound having the plurality of polymerizable functional groups in one molecule in the hard coat layer-coating composition, and wherein at least one of the hard coat layer-coating composition and the overcoat layer-coating composition comprises inorganic fine particles.