Abstract

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The dyeing properties of dyes synthesized from 2-amino-4-phenylthiazole (Dye 1) and 2-amino-4-methyl-5- carbathoxythiazole (Dye 2) on leather were studied. The effects of pH, temperature, dye concentration, dyeing time as well as rubbing and light fastness properties of the dyes were evaluated. Results obtained indicate that the dyes used were absorbed optimally at pH 3. It was found that increase in dyeing time increases percent exhaustion such that 60 % exhaustion in 20 min. was increased to 85-90 % in 40-60 min. The exhaustion of Dye 1 was 89.4 % at 50 oC while that of Dye 2 was 92 % at 65 oC. The dyeings showed very good fastness to rubbing and good fastness to light

Keywords: 2-amino-4-phenylthiazole, 2-amino-4-methyl-5-carbathoxythiazole, monoazo, leather