| abstract |
An optical film made of a resin C comprising a copolymer P comprising a polymer unit A and a polymer unit B, comprising a phase-separated structure exhibiting structural birefringence, wherein the phase-separation structure is a phase containing the polymer unit A as a main component and the phase containing the said polymer unit B as a main component, The value of Rth/d calculated from thickness direction retardation Rth (nm) and thickness d (nm) is 2.5 x 10 -3 or more, The optical film. |