abstract |
【Task】 A polarizing element and a polarizing plate with improved optical characteristics and durability. [Solution] It comprises a polyvinyl alcohol resin film formed by adsorbing and stretching at least one dichroic dye which is a compound represented by formula (I) or a salt thereof as a free acid, and the degree of polymerization of the polyvinyl alcohol resin is 5000. A polarizing element having thru 10000. [Chemical 1] (In the formula, A represents a phenyl group having a substituent or a naphthyl group, and R1 to R6 each independently represent a hydrogen atom, a hydroxyl group, a lower alkyl group, a lower alkoxy group, a sulfo group, or a lower group having a sulfo group. X represents an alkoxy group, X may have a substituent, a benzoylamino group that may have a substituent, a phenylamino group that may have a substituent, or a substituent. A phenylazo group or a naphthotriazole group which may have a substituent, and m represents 0 or 1) [Selection figure] None |