| 摘要 |
There is provided a polarization film for near ultra-violet polarization plate manifesting high polarization ability at the near ultra-violet range of 370-400 nm, having sufficient endurance, and containing a monoazo compound represented by the following formula (I) or a salt thereof: wherein A represents a naphthyl having 1 to 3 sulfos or a phenyl having 1 to 2 water-soluble groups selected from sulfo and carboxyl and optionally having a lower alkyl or lower alkoxy, R1 to R4 are the same or different and represent hydrogen, lower alkyl or lower alkoxy, and R5 represents -OR6 or -NHR6 wherein R6 represents hydrogen, lower alkyl, lower alkyl sulfonyl, benzene sulfonyl, toluene sulfonyl, lower alkyl carbonyl or benzoyl, wherein the benzoyl is unsubstituted or substituted with nitro, amino or sulfo.
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