| 摘要 |
PROBLEM TO BE SOLVED: To provide a polarizing film giving a polarizer excellent in durability against heat cycle test and allowing the orthogonal hue to be neutral gray; a manufacturing method thereof; and a polarizer with a protective layer formed on the polarizing film.SOLUTION: Provided are: a polarizing film where an iodine is adsorbed and oriented to a polyvinyl alcohol resin (PVA) film, the boron content is within the range of 1 to 3.5 wt.%, and when cut into 2 mm×10 mm with an absorption axis as the long side and heated at 80°C for 4 hours, the shrinkage force in the absorption axis direction is 2.8 N or less and the b value of the orthogonal hue is within the range of -2.2 to + 0.5; and a polarizer with a protective layer formed thereto. This polarizing film can be manufactured by the method where a PVA film is subjected to iodine dyeing, boric acid treatment, and washing in this order and uniaxial stretching is performed in the step of boric acid treatment or in a previous step, and the film is subjected to primary drying to dry between the above boric acid treatment and washing. |
