Abstract
Behavior of non-ionic (disperse) dyes when dying nylon 6, polyethylene terephthalate and triacetate fibers in organic solvents has been studied, and following results are obtained.
(1) The absorption isotherm can be expressed in a formula according to Nernst's partition law.
(2) The partition coefficient, the affinity of dyeing and the heat of dyeing in organic solvents are much smaller than those in an aqueous dyeing system.
(3) The diffusion coefficients differ very much by the combination of fibers and solvents. The rate of diffusion increases largely by increasing the degrees of fiber swelling by solvents.
(4) The swelling of fibers is correlated with the solubility parameter of the solvents. The degree of maximum swelling takes place in solvents the solubility parameter of which is nearly equal to that of fibers.
