摘要：

Formula in the form of the free acid (1) [Formula 1] Wherein, R1 represents a sulfonic acid group, a carboxyl group or a lower alkoxy group, R2 represents a sulfonic acid group, a carboxyl group, a lower alkyl group or a lower alkoxy group. However, except in the case of both the sulfonic acid groups R1, R2. R3 to R6 each independently represent a hydrogen atom, a lower alkyl group or a lower alkoxyl group, R7, R8 each independently represents a hydrogen atom, an amino group, a hydroxyl group, a sulfonic acid group or a carboxyl group. Azo compound represented by] is a very useful compound as a dichroic dye for use in less polarizing plate and a polarizing plate for a liquid crystal projector using the same color leakage in the visible light range is excellent in polarizing performance and durability.

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