A retardation film and a method for manufacturing the same, and a circularly polarizing plate and an image display device using the retardation film.

摘要

PROBLEM TO BE SOLVED: To provide a reverse dispersion retardation film having excellent extensibility and phase difference expression and having a small haze. The retardation film of the present invention contains at least one bonding group selected from the group consisting of carbonate bonds and ester bonds, and a structural unit derived from divalent oligofluorene, and has a positive refractive index difference. Contains an anisotropic resin; an acrylic resin; The content of the acrylic resin is 0.5% by mass to 2.0% by mass. The acrylic resin contains 70% by mass or more of a structural unit derived from methyl methacrylate, and its weight average molecular weight Mw is 10,000 to 200,000. The Re (550) of the retardation film is 100 nm to 200 nm, and the Re (450) / Re (550) is more than 0.5 and less than 1.0. [Selection diagram] Fig. 1