The reason of color differences caused by different degree of esterification disperse dyes were investigated by disperse orange 30, disperse red 167:1, disperse blue 79:1 with different degree of esterification. The results showed that the changes of light absorbance abilities and melting points caused by ester groups had no obvious correlation with the color differences caused by ester groups. The changes in the solubilities and affinities caused by the ester groups were the fundamental reason for the changes in the dyeing properties of disperse orange 30, disperse red 167:1 and disperse blue 79:1. As a joint result of the decrease in solubilities and affinities, the dye sorption in polyethylene terephthalate of unesterified disperse orange 30, unesterified disperse red 167:1 and unesterified disperse blue 79:1 were reduced by 37.7%, 83.6% and 54.6%, respectively, compared with those of the corresponding completely esterified dyes.

研究了不同酯化度的分散染料引起色差的原因，分别是将橙色分散30，将红色分散167：1，将蓝色79：1分散于不同的酯化度。结果表明，酯基引起的光吸收能力和熔点的变化与酯基引起的色差无明显相关性。酯基引起的溶解度和亲和力的变化是分散橙30，分散红167：1和分散蓝79：1的染色性能变化的根本原因。由于溶解度和亲和力降低的共同结果，未酯化分散橙30，未酯化分散红167：1和未酯化分散蓝79：1在聚对苯二甲酸乙二醇酯中的染料吸附量降低了37.7％，83.6％和54。