Patent ID: 9348177
Filing Date: 2016-05-24
CPC Classification: C08B,C08J,C09K,G02B,G02F

Claim Text:
1. An optical film having retardations satisfying relations (1) to (3): I=Re(450)−Re(550); II=Re(650)−Re(550); III=Rth(450)−Rth(550); and IV=Rth(650)−Rth(550), wherein Re(450), Re(550) and Re(650) are in-plane retardations of 450, 550 and 650 nm, respectively; and Rth(450), Rth(550) and Rth(650) are retardations in a thickness direction of the optical film, which are of wavelength of 450, 550 and 650 nm, respectively, and wherein I, II, III and IV satisfy relations (4-D) to (7-D): wherein a material for forming the optical film comprises an acrylic polymer, or cellulose acylate.