Transferring dyes for thermal printing

Details Transferring dyes for thermal printing Transferring dyes for thermal printing

1990-10-31

1992-11-10

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Diffusion transfer dyeing process, transfer sheet and product

Dry heat treatment for penetration

8467, 8662, 8922, 8636, B41M 526, C09B 2903

Patent

active

051620456

ABSTRACT:
Dyes are transferred from a carrier by sublimation/vaporization to plastic-coated papers by a process in which the dyes used are of the general formula (I) ##STR1## where A is D--N=N-- or ##STR2## R.sup.1 and R.sup.2 are each hydrogen, alkyl, alkoxy, alkylthio or halogen and R.sup.1 and R together may furthermore form a 5-membered or 6-membered heterocyclic ring, and R and R' independently of one another are each hydrogen, phenyl which is unsubstituted or substituted by methyl or methoxy, or C.sub.5 - or C.sub.6 -cycloalkyl or C.sub.1 -C.sub.6 -alkyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -alkoxycarbonyl, C.sub.2 -C.sub.5 -alkanoyloxy, C.sub.1 -C.sub.4 -alkoxycarbonyloxy, C.sub.1 -C.sub.4 -alkoxy-C.sub.2 - or C.sub.3 -alkoxycarbonyloxy, hydroxyl, cyano, halogen, phenyl or C.sub.5 - or C.sub.6 cycloalkyl, or ##STR3## is a 5-membered or 6-membered saturated heterocyclic ring where D is a radical of a diazo component of the thiophene, thiazole, isothiazole or 1,2,4-thiadiazole series and R.sup.3 is hydrogen or CN.
In the process, the dyes (I) give strong dyeings which have good light fastness and are resistant to chemical substances.

REFERENCES:
patent: 4505857 (1985-03-01), Egli
patent: 4614521 (1986-09-01), Niwa et al.
patent: 4698651 (1987-10-01), Moore et al.
patent: 4764178 (1988-08-01), Gregory et al.
patent: 4777159 (1988-10-01), Taguchi et al.
patent: 4999026 (1991-03-01), Albert et al.

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