DYE TYPE POLARIZING PLATE

摘要

A poly(vinyl alcohol)-based polarizing film or plate which comprises a water - soluble dye having the formula (1) in a free acid form or a copper complex salt thereof. The polarizer has excellent polarizing performance capability and durability, and is suitably used for the green channel of a liquid cryst al projector when B in formula (1) is a benzoylamino group and the water-solubl e dye has a wave length for maximum absorption (.lambda.max) of 520 nm or more and less than 580 nm.