Dye-containing light-polarizing film

A dye-containing light-polarizing film showing a neutral gray comprising a dichroic dye adsorbed into a high polymer film, in which said dichroic dye is used in combination with an organic direct dye having absorption in a particular wave length region,

• wherein said dichroic dye is at least one of water-soluble copper-, nickel-, zinc- and iron-containing diazo dyes represented by formula (I) as a free acid, ##STR13## wherein Me represents a transition metal selected from the group consisting of copper, nickel, zinc and iron;
• R represents a 1-naphthol or 2-naphthol residue which is bonded to the azo group at the position adjacent to the hydroxyl group forming a complex bond together with the transition metal and which may have a substituent selected from the group consisting of sulfonic acid, sulfonamide, amino, acylamino, arylamino and hydroxyl not adjacent to the azo group;
• X and Y represent hydrogen, C.sub.1 -C.sub.4 alkyl, lower alkoxy, carboxylic acid, sulfonic acid, sulfonamide, amino, acylamino, nitro or halogen;
• and Z represents hydrogen, C.sub.1 -C.sub.4 alkyl or lower alkoxy;
• said formula (I) having from 1 to 3 sulfonic acid groups.

A dye-containing light-polarizing film comprising a dichroic dye adsorbed into a high polymer film, in which said dichroic dye is a water-soluble copper-, nickel-, zinc- or iron-containing diazo dye represented by formula (I) as a free acid

• wherein Me represents a transition metal selected from the group consisting of copper, nickel, zinc and iron;
• R represents a 1-naphthol or 2-naphthol residue which is bonded to the azo group at the position adjacent to the hydroxyl group forming a complex bond together with the transition metal and which may have a substituent selected from the group consisting of sulfonic acid, sulfonamide, amino, acylamino, arylamino and hydroxyl not adjacent to the azo group;
• X and Y represent hydrogen, C.sub.1 -C.sub.4 alkyl, lower alkoxy, carboxylic acid, sulfonic acid, sulfonamide, amino or acylamino, and Z represents hydrogen, C.sub.1 -C.sub.4 alkyl or lower alkoxy;
• said formula (I) having from 1 to 3 sulfonic acid groups.

A dye-containing light-polarizing film showing a neutral gray comprising a dichroic dye adsorbed into a high polymer film, in which said dichroic dye is used in combination with an organic direct dye having absorption in a particular wave length region,

• wherein said dichroic dye is at least one of water-soluble copper-, nickel-, zinc- and iron-containing diazo dyes represented by formula (I) as a free acid, ##STR14## wherein Me represents a transition metal selected from the group consisting of copper, nickel, zinc and iron;
• R represents a 1-naphthol or 2-naphthol residue which is bonded to the azo group at the position adjacent to the hydroxyl group forming a complex bond together with the transition metal and which may have a substituent selected from the group consisting of sulfonic acid, sulfonamide, amino, acylamino, arylamino and hydroxyl not adjacent to the azo group;
• X and Y represent hydrogen, C.sub.1 -C.sub.4 alkyl, lower alkoxy, carboxylic acid, sulfonic acid, sulfonamide, amino or acylamino;
• and Z represents hydrogen, C.sub.1 -C.sub.4 alkyl or lower alkoxy;
• said formula (I) having from 1 to 3 sulfonic acid groups.

A dye-containing light-polarizing film showing a neutral gray comprising a dichroic dye adsorbed into a high polymer film, in which said dichroic dye is used in combination with an organic direct dye having absorption in a particular wave length region,

• wherein said dichroic dye is at least one of water-soluble nickel-, zinc- and iron-containing diazo dyes represented by formula (I) as a free acid, ##STR16## wherein Me represents a transition metal selected from the group consisting of nickel, zinc and iron;
• R represents a 1-naphthol or 2-naphthol residue which is bonded to the azo group at the position adjacent to the hydroxyl group forming a complex bond together with the transition metal and which may have a substituent selected from the group consisting of sulfonic acid, sulfonamide, amino, acylamino, arylamino and hydroxyl not adjacent to the azo group, X and Y represent nitro or halogen;
• and Z represents hydrogen, C.sub.1 -C.sub.4 alkyl or lower alkoxy;
• said formula (I) having from 1 to 3 sulfonic acid groups.