| abstract |
A polymer film that has an in-plane retardation Re (λ) and a thickness-direction retardation Rth (λ) satisfying formula (i) and (ii), and that further has a surface energy of at least one surface is from 50 mN/m to 80 mN/m: n 0≦ Re (630) ≦10, and | Rth (630) |≦25; (i)n n and n | Re (400) −Re (700) |≦10, and | Rth (400) −Rth (700) |≦35. (ii)n in the formulae, Re (λ) and Rth (λ) are measurement values at the wavelength of λ nm, and an optically-compensatory film, an optical material such as a polarizer and a liquid-crystal display device using the polymer film. |