Sublimation transfer and isocyanate fixation of amino- or hydroxy-containing dyestuffs and transfer sheets therefor
AssigneeCiba-Geigy Corporation
InventorsRaymond DeFago, Hans-Joerg Angliker, Herbert Holzrichter, Werner Kneubuehler, Richard Peter
Life of this patent
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Abstract
The invention relates to a process for the manufacture of prints which are fast to wet processings and sublimation on textile or non-textile sheets by means of the transfer printing process, wherein dyestuffs containing mercapto, hydroxyl and/or amino groups and applied to sheets by means of the transfer printing process are fixed by the action of isocyanates or masked isocyanates, which are applied to the sheets before, during, or after the dyestuff transfer.
Claims25
A transfer printing process for the manufacture of prints on a textile or non-textile, hydrophobic sheet which prints are heat-fast and fast to wet processing, comprising the steps of
- a. applying to an auxiliary carrier web a sublimable dyestuff containing a hydroxyl group, an amino group or both,
- b. transferring said dyestuff to said sheet by heatinduced sublimation or diffusion from said auxiliary carrier web.
- c. subsequently providing to the printed area of said sheet an isocyanate compound, having only one isocyanate group per molecule, and which is capable of reacting with said dyestuff and fixing the dyestuff to the printed area of said sheet by reaction therewith.
An auxiliary carrier web for use in heattransfer printing, consisting essentially of flexible sheet material carrying (1) a sublimable disperse dyestuff containing a hydroxyl group, an amino group or both, and (2) a masked isocyanate compound which decomposes to liberate an isocyanate, having only one isocyanate group per molecule, at a temperature no greater than 240.degree.C., wherein the sublimation temperature of the dyestuff is at least 10.degree.C. lower than the decomposition temperature of the masked isocyanate.
Dependencies are inferred from the claim text.