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Equilibrium isotherms have been obtained at 80d̀c. with acetate rayon and five disperse dyes. Two azo dyes showed a linear relationship up to saturation between dye on the fibre and dye in the aqueous phase. Non‐linear curves were obtained with three anthraquinonoid dyes, but a straight line was obtained when a solubilisate of 1‐methylamino‐4‐anilinoanthraquinone was used in place of a dispersion. With purified Dispersol Fast Scarlet B the slope of the isotherm was found to be independent of liquor: yarn ratio, and inversely proportional to the concentration of dispersing agent over a limited range. The adsorption by acetate rayon of purified Lissapols C and LS has been studied at 80δc. Both detergents hydrolyse gradually in hot aqueous solution.
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Bird et al. (1955) studied this question.
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