Patent ID: 9500790
Filing Date: 2016-11-22
CPC Classification: C07D,G02B,G02F,H01L

Claim Text:
1. An optical film comprising a thermoplastic resin and at least one compound which satisfies all of the following requirements (1) to (5): (1) the compound has at least two absorption maxima in a wavelength region of from 200 nm to 350 nm in a solution absorption spectrum; (2) when a wavelength of a first absorption maximum of the two absorption maxima in the wavelength region of from 200 nm to 350 nm is designated as λmax1, and a wavelength of a second absorption maximum of the two absorption maxima at shorter wavelengths than the first absorption maximum is designated as λmax2, wherein λmax1−λmax2 is 20 nm or more; (3) an aspect ratio of a molecule of the compound is 1.70 or more; (4) the compound has a non-aromatic hydrocarbon ring, an aromatic heterocyclic ring, or a non-aromatic heterocyclic ring in the molecule; and (5) for a sample film having a thickness of 60 μm and containing the thermoplastic resin and the compound at a proportion of 1% by mass with respect to the thermoplastic resin, when a retardation in an in-plane direction at a wavelength of 550 nm before stretching of the sample film is designated as R for a blank film having a thickness of 60 μm and formed from the thermoplastic resin, when a retardation in the in-plane direction at a wavelength of 550 nm before stretching of the blank film is designated as R an in-plane retardation increase sensitivity defined by A−B is 0.1 or more, wherein when the retardations in the in-plane direction measured at wavelengths of 450 nm, 550 nm and 650 nm are designated as R