Bleaching and dyeing; fluid treatment and chemical modification – Organic additive for dye composition – dye composition... – Polymeric additive
Patent
1982-09-15
1984-06-26
Clingman, A. Lionel
Bleaching and dyeing; fluid treatment and chemical modification
Organic additive for dye composition, dye composition...
Polymeric additive
8493, 8652, 8918, 8650, D06P 130, D06P 360
Patent
active
044564538
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for the simultaneous oxidation and fixing of dyes applied to cellulosic fibers and using sulfur dyestuffs.
Oxidation after the application of a tint with a sulfur dyestuff upon a cellosic fiber can be achieved with a number of compounds. Among the compounds most in use currently, oxygenated water, sodium bichromate, alkali chlorites, potassium iodate, and potassium bromate can be cited.
It is known that for a certain number of sulfur dyestuffs it is necessary to follow the oxidation treatment by another treatment intended to improve the stability and particularly the stability under moist conditions of the dye. Numerous compounds have been proposed for this purpose, for example, compounds with a dicyanodiamide base. In all such cases, however, the use of the different additives is not effective except after oxidation of the respective dyestuff.
Recently it has been proposed to improve upon the earlier processes by carrying out oxidation and fixation of the dye in a common bath, the oxidation being achieved in this case with the aid of sodium chlorite and the fixation obtained with the aid of alkyl derivatives. This process, however, does not provide for the use of one formulation permitting oxidation and fixation starting from a single substance; the separate addition of each of the products under the rigorous conditions of pH and temperature is absolutely necessary because of the instability of the different compounds.
The object of the present invention is to provide for the oxidation and the fixation of sulfur dyestuffs in a common bath, the introduction in the form of a single stable compound of a derivative serving to achieve simultaneously this oxidation and this fixation.
It is equally an object to provide stable aqueous formulations combining the oxidizing agents and the fixation agents serving in the post treatment of sulfur dyestuffs.
Thus the invention relates to a process of oxidation and fixation simultaneously in the dyeing of cellulosic fibers with sulfur dyestuffs, whose novelty resides in that it is effected in the presence of a stable aqueous formulation combining an oxidation agent selected from iodates and bromates of alkali metals and a fixation agent selected from the thermohardenable (thermosetting) cationic resins.
The thermohardenable cationic resin is advantageously selected from the reaction products of a polyester resin having a carboxylic group at the end of a chain, with an epoxyamine addition compound, the reaction being followed by a condensation with epi-chlorohydrin as is described in French Pat. No. 69 16 433 of the applicant.
The polyester resin is obtained by reaction of a saturated or unsaturated aliphatic dicarboxylic acid containing 3 to 10 carbon atoms with a straight or branched chain aliphatic glycol having two primary hydroxylic groups or one primary hydroxylic group and a secondary hydroxylic group, or possible two secondary hydroxylic groups.
The epoxyamine compound is oxygenated by the reaction of a compound whose molecule contains a plurality of epoxy groups, preferably two epoxy groups, with a polyamide containing at least four reactive hydrogen atoms per molecule.
According to another embodiment, the thermohardenable cationic resin is selected from the polyamide polyester copolymers which are soluble in water such as those described in the French Pat. No. 74 40 699 of the applicant; these copolymers are obtained by reacting a saturated or unsaturated aliphatic dicarboxylic acid containing 3 to 10 carbon atoms, with a mixture of polyalkylenic polyamine and dialkanolamine in molar proportions of dicarboxylic acid/polyamine/dialkanolamine of the order of 0.8 to 1.1/0.3 to 0.9/0.1 to 0.7 at a pH between 1 to 3 and at a temperature between 120.degree. to 200.degree. C., the reaction of these copolymers with epichlorohydrin being carried out between 45.degree. and 100.degree. C. in a ratio of 0.5:1.8 mole of epichlorohydrin per active hydrogen atom.
According to another embodiment, the thermohardenable cationic resin is
REFERENCES:
patent: 3334138 (1967-08-01), Feeman
patent: 3702351 (1972-11-01), Tesson
patent: 3944382 (1976-03-01), Doerr
patent: 4042319 (1977-08-01), Baum et al.
Clingman A. Lionel
Dubno Herbert
Manufacture de Produits Chimiques Protex
Ross Karl F.
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