| 摘要 |
<p>[Problem] To develop a polarizing element having high durability and having favorable polarization properties without using a starting material belonging to a specific chemical substance such as a dianisidine. [Solution] The polarizing element, which contains dichroic pigments and comprises a film of a stretched polyvinylalcohol resin or a derivative thereof, is characterized by at least one of the dichroic pigments being the azo compound represented by formula (1) or a salt thereof. (In the formula: A indicates a benzene ring or a naphthyl group that is unsubstituted or has at least one substituent group selected from the group consisting of a sulfo group, an alkyl group, an alkoxy group, an alkoxyl group having a sulfo group, a carboxy group, a nitro group, an amino group, and a substituted amino group; R1, R2, R3, and R4 each independently indicate a hydrogen atom, an alkyl group, an alkoxy group, a sulfo group, or an alkoxy group having a sulfo group.)</p> |
