Abstract
The catalytic fading of combination dyeings on polyester fabric of six pyridone-azo and one quinolone-azo yellow disperse dyes imparted by C.I. Disperse Blue 165 as a result of exposure to a carbon arc in air was analyzed in terms of reactivity ( k 0) towards singlet oxygen and the photosensitivity ( f) of the dyes. Based on the assumption that the rate of photo-fading of single dyeings is proportional to the product of k 0 and f, the fading behavior of both single and mixture dyeings was explained. The k 0 values for the seven azo dyes could be correlated to the sum of electrophilic frontier densities determined using the PM5 method. The nitro groups in the pyridone-azo dyes decreased the reactivity of the electron density in parts of the diazo component. Disperse dyes with excellent light fastness on polyester exhibit low values of both f and k 0. The f values observed for the combination dyeings did not show simple additivity.
Published Version
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