Abstract:
PURPOSE: Provided is benzothiazole-based dispersion-reactive dye, which reduces pollution, dose not contain hazardous amine and metals, can be used in acidic and neutral condition, and is excellent in washing-fastness and properties. CONSTITUTION: The benzothiazole-based dispersion-reactive dye represented by the formula 1 is produced by a process comprising the steps of: diazotizing 2-amino-5-(beta-acetoxy ethyl sulfone)benzothiazole or 2-amino-5-(beta-hydroxy ethyl sulfone)benzothiazole; preparing a coupling solution by dissolving a coupler in an acid mixture; mixing the diazotized 2-amino-5-(beta-acetoxy ethyl sulfone)benzothiazole and the coupling solution at 5-10deg.C and adding a base and separating the produced dye or mixing the diazotized 2-amino-5-(beta-hydroxy ethyl sulfone)benzothiazole and the coupling solution at 5-10deg.C and stirring at 80-90deg.C by using acetic anhydride. In the formula, R, R1, R2, and R3 are identically or differently hydrogen, alkyl, alkoxy, cyanoalkyl, or amino acetyl.
Abstract:
PURPOSE: Provided is a water-insoluble dispersion-reactive dye having an acetoxy ethyl sulfone reactive group, which reduces pollution, dose not contain hazardous amine and metals, can be used in acidic and neutral condition, and is excellent in washing-fastness and properties. CONSTITUTION: The dispersion-reactive dye(formula 2) having the 4-aminophenyl-beta-acetoxy ethyl sulfone reactive group(formula 1) is produced by a process comprising the steps of: diazotizing the 4-aminophenyl-beta-acetoxy ethyl sulfone(formula 1); making a coupling solution by dissolving a coupler in water and concentrated hydrochloric acid; mixing the diazotized 4-aminophenyl-beta-acetoxy ethyl sulfone with the coupling solution at 0-5deg.C; adding a base to keep pH neutral condition and separating the produced dye. In the formula, R, R1, R2, and R3 are identically or differently hydrogen, alkyl, alkoxy, cyanoalkyl, amino acetyl, and amino ester.