PHASE DIFFERENCE FILM, POLARIZATION PLATE USING THE SAME, AND LIQUID CRYSTAL DISPLAY UNIT

摘要

Provided is a phase difference film having excellent phase difference performance and moisture permeability and few changes in the phase difference value with respect to environmental humidity, and also provided are a polarization plate comprising the phase difference film, and a liquid crystal display unit. The phase difference film prevents polarizer irregularities between the core of a roll and the outside of the roll when a polarization plate roll is fabricated, and the phase difference film has excellent adhesion with the polarizer. The phase difference film comprises: a cellulose ester that satisfies a predetermined relational expression; and a vinyl compound polymer or oligomer having substituent groups selected from specific substituent groups and a weight-average molecular weight within a range of 500 to 200,000, in which the mass ratio of the cellulose ester and the polymer or oligomer content is within a range of 95:5 to 50:50.