POLARIZER, PROCESS FOR PRODUCING THE SAME, OPTICAL FILM, AND IMAGE DISPLAY

摘要

A polarizer comprising a polarizing element comprising polyvinyl alcohol and transparent protective films disposed respectively on both sides of the polarizing element through an adhesive layer. The transparent protective film on one side comprises a (meth)acrylic resin having a lactone structure and has an in-plane retardation less than 40 nm and a thickness-direction retardation less than 80 nm. The transparent protective film on the other side comprises a cellulose ester and is a retardation film satisfying the relationship nx>ny>nz (provided that the direction in which the in-plane refractive index is maximum is taken as X-axis, the direction perpendicular to the X-axis as Y-axis, and the thickness direction as Z-axis, and the refractive indexes in the respective axial directions are expressed by nx, ny, and nz, respectively). This polarizer can satisfy durability and display evenness.