Transfer printing sheet carrying impregnant and transfer printing of cellulose, wool, silk or polyamide textile materials

Claim 1

Transfer printing support in sheet or web form for the thermoprinting of hydroxyl group or nitrogen containing textile fiber materials, characterized by the fact that it comprises, as a coating on a flat substrate: at least one impregnating agent which is a non-toxic organic substance containing at least one nitrogen atom in its molecule, which is solid up to 60° C. and has a melting temperature in the range of from 60° to 230° C., which is liquid up to at least 230° C. and substantially colourless, and which is not a film-forming polymer; at least one dyestuff in the form of a pattern to be transferred; and a binder, said dyestuff being selected from dyestuffs which are not substantially water soluble at least at neutral pH, which do not, visably ublimate under the conditions of sublimation transfer printing, and which are capable of thermosoling, said dyestuff and impregnating agent being selected such that the impregnating agent has solven properties for the dyestuff in its liquid state but not in its solid state. wherein the impregnating agent is selected from the group consisting of epsilon-caprolactam, nicotinic amide, isonicotinic amide, propylene urea, ethylene urea, glyoxal monurein, urea, 5,5-dimethyl hydantoin, imidaxol, 2-methyl imidazol, N-methyl pyrrolidone, N-hydroxy succinimide, biuret, dimethylol urea, dimethylol hydroxyethylene urea, dimethylol ethylene urea, and mixtures thereof.