Patent ID: 9535201
Date: 2017-01-03
CPC Classifications: C08L,G02B

Claim:
1. A retardation film consisting of a single layer having a slow axis with an angle of 10 to 80° with respect to a longitudinal direction thereof, wherein the retardation film contains cellulose acylate having a degree of acyl substitution of 2.0 to 2.7, and wherein: Ro a wavelength dispersion property ΔRo defined by the following formula (1) is 3 to 30 nm, all of a wavelength. dispersion property ARc originating from the cellulose acylate and defined by the following formula (2), a wavelength dispersion property ΔRa originating from the component other than the cellulose acylate and defined by the following formula (3), an in plane retardation Rc at a wavelength of 550 nm, and an in-plane retardation Ra at a wavelength of 550 nm, are equal to or greater than 0, a retardation share ratio of Ra wherein Ro