Azo compound and dye polarizing film containing the same

Abstract

Disclosed is an azo compound represented by the formula (1) below, a salt thereof, or a copper complex salt compound thereof. (In the formula, R1 and R2 independently represent a hydrogen atom, a sulfonic acid group, a lower alkyl group or a lower alkoxyl group; R3-R6 independently represent a hydrogen atom, a lower alkyl group or a lower alkoxyl group; R7 represents a lower alkyl group or a lower alkoxyl group; and n represents 0 or 1.)

1 . An azo compound represented by the formula (1) below, a salt thereof or a copper complex salt compound thereof: 
       
         
           
           
               
               
           
         
       
       wherein R1 and R2 each independently represent a hydrogen atom, a sulfonic acid group, a lower alkyl group or a lower alkoxyl group; R3 to R6 each independently represent a hydrogen atom, a lower alkyl group or a lower alkoxyl group; R7 represents a lower alkyl group or a lower alkoxyl group; and n=0 or 1. 
     
     
         2 . The azo compound, a salt thereof or a copper complex salt compound thereof according to  claim 1  wherein R7 is either a methyl group or a methoxy group. 
     
     
         3 . The azo compound, a salt thereof or a copper complex salt compound thereof according to  claim 1  or  2  wherein at least one of R1 and R2 is a sulfonic acid group. 
     
     
         4 . The azo compound, a salt thereof or a copper complex salt compound thereof according to any one of  claims 1  to  3  wherein R1 is at an ortho-position relative to an azo group and R2 is at a para-position relative to an azo group. 
     
     
         5 . The azo compound, a salt thereof or a copper complex salt compound thereof according to any one of  claims 1  to  4  wherein R3 to R6 each independently represent a hydrogen atom, a methyl group or a methoxy group. 
     
     
         6 . A dye-containing polarizing film comprising one or more azo compounds and/or salts thereof or copper complex salt compounds thereof according to any one of  claims 1  to  5  in a polarizing film base material. 
     
     
         7 . A dye-containing polarizing film comprising one or more azo compounds and/or salts thereof or copper complex salt compounds thereof according to any one of  claims 1  to  5  and one or more other organic dyes in a polarizing film base material. 
     
     
         8 . A dye-containing polarizing film comprising two or more azo compounds and/or salts thereof or copper complex salt compounds thereof according to any one of  claims 1  to  5  and one or more other organic dyes in a polarizing film base material. 
     
     
         9 . The dye-containing polarizing film according to any one of  claims 6  to  8  wherein the polarizing film base material is a film comprising a polyvinyl alcohol resin. 
     
     
         10 . A dye-containing polarizing plate comprising a dye-containing polarizing film according to any one of  claims 6  to  9  and a transparent protective film adhered to at least one surface thereof. 
     
     
         11 . A polarizing plate for a liquid crystal display comprising a dye-containing polarizing film or a dye-containing polarizing plate according to any one of  claims 6  to  10 . 
     
     
         12 . A color polarizing plate for a liquid crystal projector comprising a dye-containing polarizing film or a dye-containing polarizing plate according to any one of  claims 6  to  10 .