Kenja IP Law PC
Optical laminate, circularly polarizing plate, touch panel, and image display device
An optical layered body including a substrate layer, and an optically anisotropic layer containing at least one liquid crystal cured layer, wherein a light transmittance of the substrate layer at a wavelength of 390 nm is 1% or less, and an in-plane retardation Re0(450) at a wavelength 450 nm before the optical layered body is exposed to the xenon lamp, an in-plane retardation Re0(550) at a wavelength 550 nm before the optical layered body is exposed to the xenon lamp, an in-plane retardation Re300(450) at the wavelength 450 nm after the optical layered body was exposed to the xenon lamp for 300 hours, and an in-plane retardation Re300(550) at the wavelength 550 nm after the optical layered body was exposed to the xenon lamp for 300 hours satisfy the following formulae (1) and (2): 0.95≤Re300(450)/Re0(450)≤1.05  (1),0.95≤Re300(550)/Re0(550)≤1.05  (2).
ZEON CORPORATION
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Hiromasa Masakazu
Hashimoto Saito