Dye type polarizing plate
AssigneeNippon Kayaku Kabushiki Kaisha
InventorsShoji Oiso, Kumiko Ishii, Yoshitaka Kajiwara, Toru Tabei
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Abstract
This invention relates to a polyvinyl alcohol type 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 said polarizing plate has excellent polarizing performance capability and durability, and is suitably used for the green channel of a liquid crystal projector when B in formula (1) is a benzoylamino group and the water-soluble dye has a wavelength for maximum absorption (λmax) of 520 nm or more and less than 580 nm.
Claims3
A polyvinyl alcohol polarizing film containing, in a substrate for the polarizing film, a water soluble dye represented by the following formula (1) in the form of a free acid:
- wherein A represents the following formula (3)
- wherein X represents a nitro group or an amino group, B represents the following formula (5)
- wherein R6 represents a hydrogen atom, hydroxyl group, substituted or unsubstituted amino group, methyl group, ethyl group, methoxy group, ethoxy group, R7 represents a hydrogen atom, hydroxyl group, substituted or unsubstituted amino group, methyl group, ethyl group, methoxy group, ethoxy group in the formula (5), and n is 0 or 1, and R1, R2, R3, R4 each independently represents a hydrogen atom, methyl group, ethyl group, methoxy group, ethoxy group and acetyl amino group;
- or a copper complex salt of said acid.
Dependencies are inferred from the claim text.