Patent ID: 8023098

Claim:
A production method for a birefringent film, comprising: the step (1) of preparing a solution that exhibits a nematic liquid crystal phase, containing at least one kind of polycyclic compound containing a —SO 3 M group and/or a —COOM group (M represents a counter ion) and a solvent; the step (2) of preparing a base material at least one surface of which is subjected to a hydrophilization treatment; and the step (3) of applying the solution prepared in the step (1) to the surface of the base material prepared in the step (2), the surface being subjected to the hydrophilization treatment, followed by drying, wherein a contact angle of water at 23° C. on the surface of the base material prepared in the step (2), the surface being subjected to the hydrophilization treatment, is 45° or less.