POLYMER FILM, POLARIZING PLATE PROTECTIVE FILM, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

A polymer film includes: a wavelength dispersion regulator represented by formula (I): wherein R1 and R2 each independently represents a hydrogen atom, an alkyl group or an aryl group, provided that both R1 and R2 are not hydrogen atoms at the same time; and R3 and R4 each independently represents an electron-withdrawing substituent, and R1 and R2, or R3 and R4 may be bonded together to form a ring, and wherein the polymer film has a retardation value that satisfies the following formulae (1) and (2): <?in-line-formulae description="In-line Formulae" end="lead"?>70 nm<=Rth(548)<=300 nm Formula (1)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>Rth(628)<Rth(548)<Rth(446) Formula (2)<?in-line-formulae description="In-line Formulae" end="tail"?> wherein Rth(lambda) represents a retardation value expressed in nm in a film thickness direction measured at a wavelength of lambda nm.