PROCESS FOR PRODUCING POLARIZER, POLARIZER, POLARIZING PLATE, OPTICAL FILM, PROCESS FOR PRODUCING COMPOSITE POLARIZING PLATE, COMPOSITE POLARIZING PLATE, AND IMAGE DISPLAY DEVICE

摘要

This invention provides a process for producing a polarizer which can simultaneously realize the contact of a liquid with a hydrophilic polymer film and stretching of the hydrophilic polymer film in the widthwise direction by a tenter method or the like, using a small and simple production apparatus. The production process comprising a widthwise direction stretching step of holding both ends in the widthwise direction of a hydrophilic polymer film (1), being continuously supplied, by holding means (2), allowing the holding means (2) to travel in the longitudinal direction of the film (1), bringing the film (1) into contact with a liquid, and further moving the holding means (2), which holds at least one side of both the ends of the film (1) in its widthwise direction, to the outer side of the film (1) in its widthwise direction to stretch the film (1) in its widthwise direction, and a dying step of dying the film (1) with a dichroic substance. In the widthwise direction stretching step, the contact of the liquid is carried out by at least one of spraying and coating of the liquid, and the widthwise direction stretching step is carried out in at least one of the dying step and another step different from the dying step.;COPYRIGHT KIPO & WIPO 2010