Bleaching and dyeing; fluid treatment and chemical modification – Dyeing process utilizing electric – magnetic – or wave energy;...
Patent
1995-08-28
1997-10-21
Einsmann, Margaret
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing process utilizing electric, magnetic, or wave energy;...
8499, 8606, 8552, 8661, 8662, 8917, 8918, 8922, 8924, 8927, 8928, 8405, 8543, D06P 138, D06P 520
Patent
active
056791151
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for fixing dyes containing no polymerizable double bond to organic materials in the presence of colourless polymerizable compounds by means of ionizing radiation or by irradiation with UV light in the presence of photoinitiators.
It is known that dyes containing activated unsaturated groups can be fixed on organic material, in particular on fibre material, by the action of ionizing radiation. Compared with the conventional processes for fixing dyes, in particular reactive dyes, fixation by radiation is notable for the fact that, for example, fixing baths and fixing agents can be completely avoided. A further advantage is the simultaneous application and fixation of dye and textile finishes, for example for improving antistatic properties, reducing soil retention and improving crease resistance. Furthermore, to improve the crosslinking between dye and fibre, polymerization-capable compounds were added to the dyeing liquor and the dry material was irradiated for the purpose of fixation. The object of the present invention is consequently to provide a fixation process which offers the advantages of radiation-induced fixation for dyes containing no polymerizable double bond, too.
It has now been found that this object is achieved by the below-described, inventive process.
The present invention accordingly provides a process for dyeing or printing organic material, in particular fibre material, which comprises applying dyes containing no polymerizable double bond together with at least one colourless cationic compound containing at least one polymerizable double bond and, if desired, one or more colourless nonionic compounds containing at least one polymerizable double bond and, if desired, further auxiliaries to the fibre material and then fixing them by means of ionizing radiation, or applying dyes containing no polymerizable double bond together with at least one colourless cationic compound containing at least one polymerizable double bond and, if desired, one or more colourless nonionic compounds containing at least one polymerizable double bond and at least one photoinitiator and also, if desired, further auxiliaries to the fibre material and then fixing them by means of UV light.
The process of the invention is notable for the fact that the dye and the colourless cationic compound can be applied together, so that only a single dyebath or dyeing liquor is required and a distinctly higher degree of fixation is achieved than in known processes not involving the use of colourless cationic polymerizable compounds. However, the colourless cationic compound can also be applied separately before or after the actual dyeing process. Another advantage is that it is possible to use such a low radiation dosage that less dye is destroyed, which leads to a dyeing of high brilliance.
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 no polymerizable double bond and in the presence of at least one colourless cationic compound containing at least one polymerizable double bond and, if desired, one or more colourless nonionic compound(s) containing at least one polymerizable double bond and also, if desired, further auxiliaries in the wet, moist or dry state with ionizing radiation for a short period or in the presence of at least one photoinitiator with UV light. The treatment of the fibre material with a dye of the type defined can take place by one of the usual methods, for example in the case of textile fabric by impregnation with a dye solution in an exhaust bath or by spraying onto the fabric or by padding with a padding solution or by printing, for example on a roller printing machine, or by means of the ink-jet printing technique.
Ionizing radiation is to be understood as meaning radiation which can be detected by means of an ionization chamber. It consists either of electrically charged, directly ionizing particles which produce ions in gases along their trajectory by collisi
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Aeschlimann Peter
Fritzsche Katharina
Scheibli Peter
Ciba-Geigy Corporation
Einsmann Margaret
Mansfield Kevin T.
McC Roberts Edward
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