抄録
The various dyeing properties of the new reactive dyes, Diact Color C type, have been investigated. The dyes are derived by introducing CON3 groups in order to give the properties as the reactive dye for cellulose fibers, The results of this experiment are summarized as follows—
a) The standard affinity of these dyes for cotton and viscose rayon at 30°C are -1.9_??_-4. lkcal/mol and -1.6_??_-3.3kcal/mol, respectively. The affinity of coloring matter decomposed in alkaline solution (Na2CO3) is smaller, while in acidic solution larger than the value of the original dyes.
b) The absorption spectra in the vissible region indicate that the wave length value of absorption maxima of acidic decomposed colloring matter are shifted to long wave length from the respective values of Diact Color, and the coloring matter decomposed in aqueous NaHCO3 solution is a mixture of acidic and alkaline (Na2CO3) decomposition products.
c) The rate of reaction (recognized to be 1st order) of Diact Color in water is slow in acidic solution, but fast in alkaline solution, the reaction being accelerated by increasing the temperature.
d) The values of diffusion coefficient at 30°C with 5g/l NaCl are 0.13_??_0.21cm2/day, smaller than the values of acid dyes and larger than direct dyes.
e) The rate of batchwise dyeing and the fastness of dyeings are similar to Procion Dye (cold type). In the case of Diact Color, however, the color of dyeings are changed appreciablly by severe washing with Na2CO3.
