| abstract |
Provided is a method for manufacturing a polarizing membrane, the method comprising: a step (I-1) for at least dyeing, cross-linking, and stretching a polyvinyl alcohol-based film while conveying the polyvinyl alcohol-based film in the longitudinal direction, to produce a water-containing polarizing membrane; a step (I-2) for applying a liquid to the obtained water-containing polarizing membrane in a state in which the water content in the polarizing membrane is at least X wt%, to produce a polarizing membrane containing liquid-impregnated components; and a step (I-3) for drying the obtained polarizing membrane containing liquid-impregnated components to produce a dried polarizing membrane, wherein expression (1): X (wt%)/thickness (μm) of the dried polarizing membrane > 1 (in expression (1), X is 10-70) is satisfied. The method for manufacturing a polarizing membrane according to the present invention permits an arbitrary component to be easily and sufficiently contained in the polarizing membrane. |