In order to know dyeing properties and the mechanism of disperse dyes in three different solvents, measurements of the solubilities of disperse dyes in octane, n-buthylalcohol, and water and pertition coefficients from these solutions, have been made at the temperatures of 80°, 90° and 100°C. Affinities, heat of dyeing and heat of solution have been derived. From these values, the absolute heat of association of the dyes with the PET-substrate (ΔHabs) has been estimated, and the following results have been obtained.1. The greater the values of solubility, the smaller the values of affinity irrescective of solvents.2. The higher the values of inorganicity/organicity of dyes, the greater the solubilities of dyes in water, but the smaller in the case of octane.3. It is suggested from the values of ΔHabs (23_??_35 Kcal/mol) that dispersion force between aromatic nucleus of PET molecule and aromatic or anthraquinone nucleus of dye molecule makes a considerable part of contribution to the dye-PET interaction, and additionally, dipole-dipole interaction or hydrogen bond makes a contribution to interaction.
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TSURUOKA et al. (1968) studied this question.