Method for producing antireflection film, antireflection film, polarizing plate, and image display device

Abstract

The present invention provides a production method for the easy production of an antireflection film which has excellent antireflection properties, excellent scratch resistance, and antifouling performance and with which the occurrence of faint whitening that has thus far not been addressed is controlled, as well as an antireflection film, and a polarizing plate and image display device that use the film. The production method for producing an antireflection film involves performing, in the following order, a step (1) for forming a coating film by applying, on a transparent substrate, a composition containing at least a fluorine-containing compound, microparticles, and a binder resin and that is for forming a low-refractive-index layer, a step (2) for phase separation of the coating film into a low-refractive-index phase and an antifouling phase, and a step (3) for forming a low-refractive-index layer and an antifouling layer for covering the entire surface of the low-refractive-index layer by heating the low-refractive-index phase and the antifouling phase, or by exposing the low-refractive-index phase and the antifouling phase to ionizing radiation. In the production method, at least a transparent substrate, a low-refractive-index layer, and an antifouling layer are formed in that order, and the fluorine atom / carbon atom ratio measured by X-ray photoelectron spectroscopy (XPS) from the antifouling layer side is between 0.6 and 1.0, the silicon atom / carbon atom ratio is less than 0.25, and the average surface roughness of the antifouling layer (Ra') is 10 nm or less.

Description

technical field [0001] The present invention relates to a method for producing an antireflection film, an antireflection film, a polarizing plate, and an image display device. Background technique [0002] Conventionally, on the surface of displays such as liquid crystal displays (LCDs), plasma display panels (PDPs), and cathode tube display devices (CRTs), in order to impart high surface hardness or to prevent reflections of light from external light sources such as incandescent lamps and fluorescent lamps, Anti-reflection film is provided for the anti-reflection characteristics. Generally, an antireflection film is a film having a structure in which a hard coat layer and a low-refractive index layer are laminated on a transparent substrate. The low-refractive index layer preferably has a lower refractive index in order to contribute to antireflection. In addition, as a method for realizing low reflectance, for example, it is known to laminate a layer having a higher refra...

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Problems solved by technology

However, since the layer is formed by vapor deposition, other materials such as adhesive resin cannot be used, and since the layer strength of the antifouling layer or the adhesion to the transparent film substrate deteriorates, several times of wiping will cause The antifouling layer is peeled off from the film and the antifouling performance is significantly reduced. Also, because the evaporation must be carried out at a high temperature of several hundred degrees, there is a transparent film substrate that shrinks due to heating, or accelerates the deterioration of the product before distribution. During the test, there were problems such as decomposition of the substrate itself that was thermally damaged by high-temperature vapor deposition

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