Thermofixing of dyes in presence of polymerizable compound and a

Details Thermofixing of dyes in presence of polymerizable compound and a Thermofixing of dyes in presence of polymerizable compound and a

1996-03-14

1998-03-10

Einsmann, Margaret

Bleaching and dyeing; fluid treatment and chemical modification

Reactive dye composition, process, or product

8405, 8523, 8554, 8602, 8606, 8618, 8630, 8917, 8918, 8922, 8924, 8926, 8928, 8933, D06P 152, D06P 166

Patent

active

057256047

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a process for fixing dyes on organic materials by means of at least one colourless cationic compound containing at least one polymerizable double bond and at least one polymerization initiator by thermally initiated polymerization.
It is known that dyes, preferably those containing reactive groups, can be fixed on organic material, in particular on fibre material, by thermofixing.
The practice of dyeing, in particular, with reactive dyes but also with direct dyes has recently led to increased demands on the quality of dyeing and the economy and ecology of the dyeing process. In many cases, fixing of direct and reactive dyes carried out by conventional methods does not meet these demands. As a result, the object of the present invention is to provide an improved process for fixing which can achieve high degrees of fixation and an economically and ecologically optimum dyeing process.
It has now been found that this object can be achieved by the inventive process described below.
Accordingly, the present invention provides a process for dyeing or printing organic material, in particular fibre material, which comprises applying at least one dye, at least one colourless cationic compound containing at least one polymerizable double bond, and at least one polymerization initiator, and, if desired, further auxiliaries to the organic material, in particular fibre material, and then subjecting it to thermofixing.
The process according to the invention is distinguished by the fact that, for example, the dye can be applied together with a colourless cationic compound and a polymerization initiator, and, if desired, further auxiliaries, so that only a single dyeing vat or only a single dyeing liquor or printing paste is necessary and a substantially higher degree of fixation is achieved than in the known processes in which no colourless cationic polymerizable compound is used. It is however also possible to apply the colourless cationic compound, the polymerization initiator and also further auxiliaries, if used, separately after the actual dyeing process and then subjecting them to thermofixing.
The process according to the invention significantly reduces the use of auxiliaries and waste water since, for example, after the fixation process according to the invention, no fixing alkali has to be washed off but the dyed or printed fibre material only needs to be dried and possibly rinsed for a short period of time.
Fixing according to the invention is carried out, for example, by subjecting an organic fibre material, for example a textile fibre material, after the treatment with a dye in the presence of a colourless cationic compound containing at least one polymerizable double bond and a polymerization catalyst, and, if desired, further auxiliaries to a thermal treatment for a short period of time while it is wet, moist or dry. The treatment of the organic fibre material with a dye according to the definition can be carried out in one of the usual ways, for example in the case of textile fabric by impregnation with a dye solution in an exhaust bath or by applying a padding solution by spraying or by pad-dyeing, or by printing it, for example, in a roller printing machine or film printing machine or by means of the ink-jet printing technique.
The polymerization initiators added in the process according to the invention are inorganic or organic peroxides or aliphatic azo compounds which are activated by the heat generated during the thermal treatment and initiate the polymerization.
Examples of such polymerization initiators include, for example, 4,4'-azobis(4-cyanopentanoic acid), .alpha.,.alpha.'-azobis(butyronitrile), azoamides, for example 2,2'-azobis(2-methylpropiohydroxamic acid), 2,2'-azobis(2-methylpropionohydrazide), 2,2'-azobis(N,N-dimethyleneisobutylamidine), 2,2'-azobis(2-amidinopropane dihydrocbloride), organic peroxides, for example chloroacetyl peroxide, trichloroacetyl peroxide, benzoyl peroxide, chlorobenzoyl peroxide, benzoyl acetyl peroxide, propionyl peroxide, fluorochloroprop

REFERENCES:
patent: 4678474 (1987-07-01), Ueda et al.
patent: 5147411 (1992-09-01), Topfl
patent: 5230711 (1993-07-01), Keil et al.
patent: 5238465 (1993-08-01), Fritzsche
patent: 5409504 (1995-04-01), Fritzsche
Chemical Abstracts, 95: 205340U (JP A-56-096976).
AATCC Technical Manual-Test Method 61-1994 pp. 94-97 (1995).

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