摘要:
Fiber material composed of acid-modified homopolymers or copolymers of acrylonitrile (PAC fibers) which has been obtained by a wet spinning process, has not been dried and is still in a swollen condition (gel form), can be dyed advantageously and in fast colors by means of soluble dyes, the molecule of which contains several groups, namely more than one quaternary grouping and/or a strongly basic grouping carrying no charge, which exert a basic action towards the acid groups of the fiber substance. The chromophore of this colorant can belong to the category of monoazo or diazo dyes, methine, azamethine or diazamethine dyes or naphthalactam dyes.In accordance with the invention, after substantially removing the non-aqueous spinning solvent by washing, the spun material, as a moist gel, is dyed continuously or discontinuously from an aqueous dyebath; the fibers can be stretched before the dye is applied, during the dyeing process itself or immediately afterwards.By virtue of their special nature, the dyes of the type designated above, which have a strong fixing action, produce optimum fixing rates when dyeing PAC gels and, in the subsequent production stages, do not cause any noticeable soiling, as a result of dye which has bled out, on components of machines and operating baths, such as stretching or after-treatment baths. Investigations of penetration of the fiber by the dye, of the fixing rate and of the resulting fastness properties, such as fastness to wet processing, have shown no disadvantages compared with conventional dyes.
摘要:
Dyestuffs of the formula ##EQU1## IN WHICH Alk is lower alkyl and in which the phenyl nucleus may be further substituted by nonionic substituents, n is 2 to 6 and x is a number of 1 up to but excluding 2, are useful for dyeing polymers containing acidic groups. These dyestuffs yield stable compositions containing 20 to 40 % by weight of one or more of said dyestuffs, 20 to 40 % by weight of an organic solvent, 20 to 40 % by weight of a nonionic dispersant of the alkylphenolpolyglycolether or fat alcohol polyglycolether type and up to 20 % by weight of water.
摘要:
Improvement of a process for spin-dyeing acid-modified polymers or copolymers of acrylonitrile in which cationic quaternary dyestuffs are added to the spinning mass and spun according to the wet-spinning procedure. The improvement is characterized by using dyestuffs characterized by a migration factor M of 20 or less than 20, by a combination index K of less than 2.5 and a cation weight of more than 310. Migration factor M and combination index K are known values in the dyestuff field or can be determined. The dyestuff to be used according to the invention can belong to the most different classes of dyestuffs; they fix rapidly on the polymer, and thus they do not color, or color only to a minor extent, the coagulation, stretching and washing baths although they are soluble in water and aqueous solutions of these baths. The fibers and filaments obtained by the process of the invention have outstanding fastnesses to wet processing and, owing to the absence of dyestuff aggregates at the surface of the fiber such as occur when spin-dyeing with pigments, very good fastnesses to dry and wet rubbing. The fibers are intense, absolutely transparent and free from specks.
摘要:
Novel azamethine compounds of the formula (1) ##STR1## in which R is alkyl of from 1 to 4 carbon atoms optionally substituted, Alk is alkyl of from 1 to 4 carbon atoms, Y is the methine radical or a nitrogen atom, R.sub.1 is hydrogen or alkyl of from 1 to 4 carbon atoms optionally substituted, alkylene is an alkylene group of from 2 to 6 carbon atoms, Z is a group of the formula (2a) or 2(b) ##STR2## in which R.sub.2 is alkyl of from 1 to 4 carbon atoms optionally substituted, R.sub.3 is alkyl of from 1 to 4 carbon atoms optionally substituted, or is phenyl unsubstituted or substituted by chlorine, alkyl of from 1 to 4 carbon atoms, alkoxy of from 1 to 4 carbon atoms, nitro, carbalkoxy of from 2 to 5 carbon atoms and/or carbamoyl, R.sub.4 is hydrogen or alkyl of from 1 to 4 carbon atoms optionally substituted, or R.sub.2 and R.sub.3 together with the nitrogen atom form a heterocyclic ring containing optionally nitrogen, oxygen or sulfur as a further hetero atom, or R.sub.2 and R.sub.3 or R.sub.2, R.sub.3 and R.sub.4 together with the positive nitrogen form a heterocyclic ring containing optionally nitrogen, oxygen or sulfur as a further hetero atom, the benzene nucleus A is unsubstituted or substituted by halogen, nitro, cyano, sulfamoyl, alkyl of from 1 to 4 carbon atoms, alkoxy of from 1 to 4 carbon atoms and/or carbalkoxy of from 2 to 5 carbon atoms, the benzene nucleus B is unsubstituted or substituted by halogen, nitro, alkyl of from 1 to 4 carbon atoms, alkoxy of from 1 to 4 carbon atoms and/or carbalkoxy of from 2 to 5 carbon atoms, n is the integer 1 or 2, and X.sup.(-) is the equivalent of a colorless anion.These novel compounds can be prepared in usual manner analogously to known processes using the corresponding indoline and alkoxyaniline derivatives as starting compounds with optional subsequent alkylation.The novel azamethine compounds are well suitable as dyestuffs, soluble in water and in acids as well as in various organic solvents, for the dyeing of preferably acid-modified aromatic polyesters, acid-modified polyamides and acid-modified polyacrylonitrile materials, especially those in the form of fibres or in the mass by means of a spin-dyeing procedure.
摘要:
A process for the direct preparation of pure thiazolazo compounds had been found with the use of a 2-aminothiazole as diazo or azo component in a coupling process wherein the 2-aminothiazole used therein is subjected to the usual coupling reaction, if used as diazocomponent after diazotation, without intermediate isolation after its preparation in known manner. This process avoids the preparation of the 2-aminothiazoles as starting compounds in its solid form and the expensive purification of these instable compounds and yields now very pure azo products.
摘要:
Improvement of a process for spin-dyeing acid-modified polymers or copolymers of acrylonitrile in which cationic quaternary dyestuffs are added to the spinning mass and spun according to the wet-spinning procedure. The improvement is characterized by using dyestuffs characterized by a migration factor M of 20 or less than 20, by a combination index K of less than 2.5 and a cation weight of more than 310. Migration factor M and combination index K are known values in the dyestuff field or can be determined. The dyestuff to be used according to the invention can belong to the most different classes of dyestuffs; they fix rapidly on the polymer, and thus they do not color, or color only to a minor extent, the coagulation, stretching and washing baths although they are soluble in water and aqueous solutions of these baths. The fibers and filaments obtained by the process of the invention have outstanding fastnesses to wet processing and, owing to the absence of dyestuff aggregates at the surface of the fiber such as occur when spin-dyeing with pigments, very good fastnesses to dry and wet rubbing. The fibers are intense, absolutely transparent and free from specks.
摘要:
The invention relates to dye compositions for obtaining level dyeings on carboxamido-containing and hydroxyl-containing fiber materials, which dyeings have comparably good light and wetlightfastness properties, the dye compositions containing dioxazine dyes (I) and disazo dyes (II) (one or more than one from IIa to IIf) in a weight ratio of 90:10 to 10:90, preferably 60:40 to 10:90, in particular 40:60 to 15:85.
摘要:
In an existing isothermal dyeing process, the alkali required for dye fixation is added to the neutral dyebath under linear or progressive program control. In this process, the amount of alkali added per unit time is small at the beginning and is increased progressively and in accordance with a program. This process passes through a certain (non-controlable) initial phase until the start of dye fixation on the cellulose. As a consequence the rate of fixation passes through a maximum before gradually decreasing when the final state of the dyeing is reached. To shorten the initial phase (waiting time) of dye fixation and to slow down dye fixation during the steepest part, it has proved advantageous according to the invention to add the alkali in accordance with a parabolic program.
摘要:
Azo dyes of the formula ##STR1## wherein R.sup.1 is alkyl having 1 to 4 carbon atoms; R.sup.2 is alkyl having 1 to 3 carbon atoms; R.sup.3 is alkylcarbonyloxyethyl having 1 to 3 carbon atoms in the alkyl moiety, alkoxycarbonyloxyethyl having 1 to 4 carbon atoms in the alkoxy moiety, methoxyethoxycarbonyloxyethyl or ethoxyethoxycarbonyloxyethyl; and R.sup.4 is one of the definitions of R.sup.3 or cyanoethyl; or mixtures of at least two species of said formula are used for dyeing and printing hydrophobic fiber materials.
摘要:
Liquid formulations of mixtures of cationic dyes frequently have a very short storage life. As a consequence, these formulations give rise to customer complaints concerning incorrect dyeing strengths and hues and concerning isoluble constituents. It has now been found according to the invention that powder formulations and in particular liquid formulations of cationic dyes or of mixtures of these dyes can be stabilized by adding selected oxidizing agents.