Bleaching and dyeing; fluid treatment and chemical modification – Dyeing process utilizing electric – magnetic – or wave energy;...
Patent
1994-12-02
1996-11-19
Einsmann, Margaret
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing process utilizing electric, magnetic, or wave energy;...
8549, 8552, 8554, 8558, 8606, 8586, 8587, 8582, 8594, 8662, 8532, D06P 520, D06P 152, D06P 366
Patent
active
055758207
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the dyeing or printing of organic material, in particular fibre material, which comprises applying dyes containing at least one polymerisable double bond together with at least one colourless cationic compound containing at least one polymerisable double bond and, if desired, one or more colourless nonionic compounds containing at least one polymerisable double bond and, if desired, further auxiliaries to the organic material, in particular fibre material, and then fixing them by means of ionising radiation.
The fixation of dyes containing-activated unsaturated groups by exposure of organic material, even fibre material, to ionising radiation is known. Compared with the conventional methods for the fixation of dyes, in particular of reactive dyes, fixation produced by radiation is distinguished by the fact that, for example, fixing baths and fixing agents can be completely avoided. The simultaneous application and fixation of dye and textile finishing agents, for example for improving antistatic properties., reducing the soilability and the crease resistance, was regarded as a further advantage. Furthermore, to improve crosslinking of the dye and the fibre, polymerisable compounds were added to the dye liquor, and the dry dyed material was irradiated in order to fix the dye. An increase in the fixation yield could not be observed.
The practice of dyeing, in particular with reactive dyes but also with disperse dyes, has recently led to increased demands on the quality of the dyeing and the economy of the dyeing process. Fixation of reactive dyes by means of ionising radiation alone has hitherto not yet been carried out in practice due to the low degrees of fixation. Consequently, the object of the present invention is to provide an improved process for fixation which in addition exhibits the advantages of fixation produced by radiation.
It has now been found that this object can be achieved by means of the inventive process described below.
Accordingly, the present invention relates to a process for the dyeing or printing of organic material, in particular fibre material, which comprises applying dyes containing at least one polymerisable double bond together with at least one colourless cationic compound containing at least one polymerisable double bond and, if desired, one or more colourless nonionic compounds containing at least one polymerisable double bond and, if desired, further auxiliaries to the organic material, in particular fibre material, and then fixing them by means of ionising radiation. The process according to the invention is distinguished by the fact that dye and colourless cationic compound can be applied together, so that only a single dye bath or dyeing liquor is necessary and a substantially higher degree of fixation is achieved than in the known processes which do not use a colourless cationic polymerisable compound. A further advantage is that the process can be operated at such a low radiation dosage that less dye is destroyed, resulting in high brilliance of the dyeing.
The process according to the invention considerably reduces the use of auxiliaries and apparatuses, since, according to the fixation procedure of the invention, no fixing alkali has to be washed off, rather only drying and maybe a brief rinsing of the dyed or printed fibre material are necessary.
The process of fixation consists in irradiating a fibre material to be dyed, for example a textile fibre material, after the treatment with a dye containing at least one polymerisable double bond and/or at least one polymerisable ring system and in the presence of at least one colourless cationic compound containing at least one polymerisable double bond and, if desired, one or more colourless nonionic compounds containing at least one polymerisable double bond and, if desired, further auxiliaries while wet, moist or dry with ionising radiation for a short period. The treatment of the fibre material to be dyed with a dye according to the definition can take place by one of the usual
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Ciba-Geigy Corporation
Einsmann Margaret
Mansfield Kevin T.
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