optical film

Abstract

The subject of this invention is providing the optical film which reduced the generation|occurrence|production of the crack and chip|tip at the time of punching of a polarizing plate when using an optical film as a protective film of a polarizing plate. The optical film of the present invention is an optical film containing a cycloolefin resin, characterized in that the cycloolefin resin is a cycloolefin resin having at least one hydrogen bond accepting group, and the film contains an alcohol solvent and a hindered phenol solvent. compound, and contains 0.1 to 2.5% by mass of silica particles relative to the total mass of the film, and the hydrophobization degree of the silica particles measured by the methanol wettability method is calculated by volume ratio using methanol and pure water. The degree of hydrophobization in the case of the first solution of 3:7 is 20% or less, and the degree of hydrophobization in the case of the second solution using methanol and pure water in a volume ratio of 6:4 is 80% or more.

Description

technical field [0001] The present invention relates to an optical film. More specifically, when using an optical film for the protective film of a polarizing plate, it is related with the optical film etc. which reduced the generation|occurrence|production of the crack and chip|tip at the time of punching of a polarizing plate. Background technique [0002] In the past, the polarizing plate was cut into a rectangular shape for liquid crystal display devices. However, from the viewpoint of improving design, in recent years, displays with polygonal and curved lines have appeared for car navigation systems and other in-vehicle displays. Therefore, it is necessary to respond Polarizers are cut in various shapes. [0003] In addition, since in-vehicle displays are exposed to severe environments such as high temperature and high humidity, it is preferable to use an optical film using a resin excellent in heat resistance and moisture resistance, such as a cycloolefin-based resin ...

AI Technical Summary

Problems solved by technology

[0004] When cutting the polarizer into a shape other than a rectangle, it is necessary to punch out a free shape, but for curved parts, etc., there is a problem as follows: Cracks such as burrs and cracks are likely to occur on the end surface, or chips due to cutting are likely to occur, and this problem becomes more serious as the thickness of the polarizer becomes thinner.

[0005] Usually, in order to improve the operability in the film production process and processing process, it is suitable to use a matting agent (fine particles) such as silica particles, but in cycloolefin resins, silica particles tend to aggregate, and the aggregated silica particles are It is easy to become the starting point of the crack when punching the polarizing plate

[0006] Patent Document 1 describes an example in which fine particles of a matting agent are contained in a cycloolefin-based resin film. Although it is true that the workability can be improved by this technology, it is not effective in reducing the generation of cracks and chips when punching out in a free shape. full

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