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US 6,020,470 AGranted
Water-soluble azo compounds and process for producing the same
AssigneeKabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo
InventorsRyuzo Ueno, Masaya Kitayama, Kenji Minami, Masaharu Kittaka
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Abstract
The present invention provides novel water-soluble azo compounds derived from 2-hydroxynaphthalene-3,6-dicarboxylic acid or derivatives thereof and diazonium salts having sulfo group(s). These compounds are useful as raw materials for dyes having excellent dyeing properties and fastness.
Claims3
A water-soluble azo compound represented by the general formula [I]:
- ##STR22## wherein, Y is --OM, --OR1, or --NH--X, and Y' is --OM', --OR1', or --NH--X',
- in which M and M' each represent a hydrogen atom or an alkali metal;
- R1 and R1' each represent a group selected from an optionally branched saturated or unsaturated aliphatic hydrocarbon group having 1 to 6 carbon atoms, an optionally substituted cycloalkyl group having 3 to 6 carbon atoms, and an optionally substituted aromatic group;
- and
- X and X' each represent an optionally substituted aromatic group or an optionally substituted heterocyclic group having conjugated double bonds;
- provided that at least one of Y and Y' represents --OM or --OM';
- p represents an integer 1 or 2;
- Z is ##STR23## in which R2, R3 and R4 each represent a hydrogen atom or a halogen atom;
- and
- W1 and W2 each represent a hydrogen atom, a halogen atom, or a group selected from ##STR24## in which the aromatic rings may optionally have further substituent(s);
- m1 and m2 each represent an integer 1 or 2, and n1 and n2 each represent an integer from 1 to 3.
8 more elements
Dependencies are inferred from the claim text.