| 摘要 |
To develop a polarizing element having a good polarizing property, and also having a high durability without use of a raw material belonging to a specified chemical substance such as dianisidine. Provided is a polarizing element that comprises a film of a polyvinyl alcohol resin or a derivative thereof containing dichromatic pigments, and having been stretched, in which at least one of the dichromatic pigments is an azo compound represented by Formula (1) or a salt thereof.
(wherein, A represents a naphtyl group or a benzene ring that is unsubstituted, or has one or more of substituents selected from a group consisting of a sulfo group, an alkyl group, an alkoxy group, an alkoxy group having a sulfo group, a carboxy group, a nitro group, an amino group, and a substituted amino group; and, R1, R2, R3 and R4 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, a sulfo group, or an alkoxy group having a sulfo group.) |
