| 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: (i) 0≤ Re(630) ≤ 10, and |Rth(630)|≤ 25; and (ii) |Re(400) - Re(700)≤ 10, and |Rth(400) - Rth(700)|≤ 35. 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. |