[Object] A polarizing element and polarizing plate having improved optical properties and durability.
[Solution] A polarizing element characterized in comprising a polyvinyl alcohol resin film adsorbing at least one dichromatic pigment that is a compound represented by formula (I) or a salt thereof as a free acid, and being streched, wherein the polyvinyl alcohol resin has a degree of polymerization of 5,000 to 10,000:
(wherein A represents a phenyl group or a naphthyl group having a substituent; R1-R6 each independently represent a hydrogen atom, a hydroxyl group, a lower alkyl group, a lower alkoxy group, a sulfo group, or a lower alkoxy group having a sulfo group; X represents an amino group optionally having a substituent, a benzoylamino group optionally having a substituent, a phenylamino group optionally having a substituent, a phenylazo group optionally having a substituent, or a naphthotriazole group optionally having a substituent; and m represents 0 or 1).
[目的]一种偏光元件和偏光板,具有更好的光学性能和耐久性。
[解决方案] 一种偏光元件,其特征在于由聚
乙烯醇树脂薄膜组成,该薄膜吸附了至少一种二色
颜料,该
颜料是由式(I)代表的化合物或其作为
游离酸的盐,并被拉伸,其中聚
乙烯醇树脂的聚合度为 5,000 至 10,000:
(其中 A 代表苯基或具有取代基的
萘基;R1-R6 各自独立地代表氢原子、羟基、低级烷基、低级烷氧基、磺基或具有磺基的低级烷氧基;X 代表任选具有取代基的
氨基、任选具有取代基的苯甲酰
氨基、任选具有取代基的苯基
氨基、任选具有取代基的苯基偶氮基团或任选具有取代基的
萘三唑基团;以及 m 代表 0 或 1)。