Rapid application and fixation of dye or brightening agent on sy

Bleaching and dyeing; fluid treatment and chemical modification – Chemical modification of textiles or fibers or products thereof – Treating textiles or fibers from synthetic resin or natural...

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8 94A, 8173, 8176, D06P 168

Patent

active

039921450

ABSTRACT:
Non-aqueous, atmospheric pressure, batch exhaust process for applying and fixing a disperse dye or brightening agent on a disperse dyeable synthetic polymer, for example, a polyester, in the form of a fiber, fabric or film, said process providing good exhaust and rapid fixation of dye and agent and comprising:
A. immersing the polymer in a bath containing a dispersion comprising a liquid, organic continuous phase, a dispersing agent having dispersing activity in the continuous phase and at least one member of the group consisting of disperse dye and brightening agent, said continuous phase being a non-solvent for the dye or brightening agent;
B. distillatively removing the continuous phase from the bath and replacing same, at a rate which is volumetrically proportional to the rate of removal of the continuous phase, with a liquid fluorocarbon which is miscible with the continuous phase and has a fluorine to carbon atom ratio of at least 1.5, a solubility parameter of no greater than 6.5 and a boiling point at 760 mm. pressure at least as high as the glass transition temperature (Tg) of the polymer and at least 10.degree. C. higher than that of the continuous phase;
C. heating the polymer to at least its Tg and maintaining it at this temperature until the dye or agent is fixed on the polymer; and
D. recovering polymer having dye or agent fixed thereon.

REFERENCES:
patent: 3081140 (1963-03-01), Ford
patent: 3255149 (1966-06-01), Dye
patent: 3667898 (1972-06-01), Bergman et al.
patent: 3900287 (1975-08-01), Jackson
Gebert, Melliand Textilberichte, 1971, 5Z (6), pp. 710-715.
Farben Revue, 1971, Special Edition 13, pp. 78-97.

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