IL32631A - Continuous dyeing of synthetic polyamide textile fibers - Google Patents

Description

of textile m The present invention concerns the continous dyeing of synthetic textile fibres with a basic Textile fibres consisting of synthetic are usually dyed either in aqueous solutions or dispersions of dyestuffs at the boiling temperature of the water or under pressure at temperatures between and or by in an aqueous suspension of dyestuff followed by thermal fixation or These processes have various In the case of the polyamides 11 they for to dyeings which are not very and in the case of texturised they lead to uneven when plastosoluble dyestuffs are expensive grinding and dispersing operations are required in order to obtain these dyestuffs in a suitable In order to remove these disadvantages it has been proposed to dye these fibres by impregnating with a solution of in mixture of alcohols and halogenated hydrocarbon derivatives followed by a heat There are however great technical difficulties in the application of this especially in obtaining shades which are uniform and fasb to It has also been proposed to dye with solutions of dyestuffs in solvents and at elevated this if used with the usual commercial does not give satisfactory especially regard to the tinctorial yields and the to wet treatments now results are in the continuous dyeing of synthetic textile fibres having functions passing these materials a very short time from some seconds to some preferably between 10 seconds and 2 at a temperature from to through comprising dioloor a boiling point from to and an anionic dyestuff in the form of the free The synthetic textile fibres possessing basic functions which the present process is applied may be for based on polyamides products of with adipic polymerisation products of polycondensation products of undecanoic acid and other analogous or based on They may be in various forms such as or and they may or may not be The dyestuffs which may be used are those containing at least one free acid group not in salt such as for example a sulphonic or carboxylic acid metallised dyestuffs or metalliferous complexes of the type or the type possessing free acid groups may for example be The amounts of dyestuff to be used depend upon the dyeing conditions and the shades they are only limited by the solubility of the dyestuffs in the diols and triols Suitable organic boil at between and and vhich may be used as solvents for the d estuffs are for exam le and triolo ouch The application of the solution of the textile material is preferably effected by impregnation and for in an apparatus of the wheeled vat type or in a William The greater part of the excess solution may eliminated by for example by squeezing between two rollers and is preferably returned to the impregnating The textile material is then either in the cold or with a solvent or a mixture of solvents with a low boiling such as isopropyl methyl ethyl methylene or methyl or ethyl These volatile solvents may be easily recovered and The present process enables colorations to be obtained in very short times which have penetrated well and are resistant to rubbing and have a fastness to wet treatments and light at least equal to those obtained by the usual It also enables the to be used in any physical form and the long grinding necessary to obtain some of them in a form suitable for their usual application to be The invention is illustrated but not limited the following Examples in which the parts are parts by Example 1 10 parts of the Acid Blue 129 the form of the are dissolved in 1000 parts of pure ethylene This solution is raised to a of v and uniform shade is thus obtained having a fastness to washing and light comparable to that obtained by dyeing in an aqueous instead of the dyestuff mentioned one of those indicated in Table I below is used in the form of the free the dyeing conditions remaining the uniform and well developed shades are also TABLE I Example 2 10 parts of the dyestuff Acid Blue in the form of the acid are dissolved at in 1000 parts of diethylene This solution is raised to a temperature of and a fabric is moved about therein for one then drained by squeezing between two rollers and rinsed immediately in A result comparable to that obtained in the first paragraph of Example 1 is Example temperature of and a fabric is dyed therein as in Example a similar result being Example On replacing the fabric in Example 1 by a polyamide fabric and operating at instead of a uniform blue shade having good fastness is also Example 10 parts of Violet form of the acid are dissolved at in parts of ethylene This solution is to a temperature of a polyamide 11 fabric is moved about therein for one drained and rinsed in A deep and uniform colouration of a violet shade with good fastness to washing is thus With the dyestuffs of Table II the same dyeing conditions lead to deep and well developed shades Table Analogous results are obtained on replacing fabric in example by a polyamide fabric or by a fabric made of fibres marketed under the name of Example 6 10 parts of the Acid Violet in the form of the are dissolved at in 1000 parts of ethylene This solution is raised to a temperature of and a fabric is moved about therein for one and the operation is finished as in the preceding A uniform and fast violet shade is also Example 7 0 parts of the dyestuff Acid Black in the form of the acid are at in 1000 parts of ethylene solution is raised to a temperature of and an unbleached polyamide fabric is moved about therein one and the operation is finished as in Example A uniform and fast black shade is The fabric is then set by thermal fixation on tenters at for one insufficientOCRQuality

Claims (1)

1. CLAIMS A process for the continuous dyeing of synthetic polyamide textile wherein the fibres are passed for a very short from some seconds to some at a temperature from to through a solution comprising a liquid diol or triol having a boiling point from to and an anionic dyestuff in the form of the free process according to Claim wherein the fibres are passed through the solution for from ten seconds to two A process for the continuous dyeing of synthetic polyamide textile substantially as described herein with reference to the For the Applicants insufficientOCRQuality