Hoechst Aktiengesellschaft

Claus Schuster

Manfred Schneider

Rudolf Schickfluss

Manfred Hahnke

Reinhard Hahnle

Joachim Steinbach

Horst Homuth

Gerd Krauzpaul

Ullrich Saalfrank

Cellulose fibers are dyed ecologically soundly with sulfur black dyes by the pad-dyeing process by avoiding sulfides as reducing agent by replacing them by a dithionite-based mixture with at least one reducing sugar. A high color yield, a deep black shade and good reproducibility are ensured. The preferred reducing sugar is glucose.

Pad-dyeing of cellulose fibers with sulfur black dyes: mixture of

In printing transfer papers with standard aqueous print pastes, the local swelling of the paper substance gives rise to the problem of the dimensional stability of the papers. These disadvantages are eliminated according to the invention by using as print pastes foamed dyestuff liquors in which the consistency of the foam acts as thickening agents. As a result the moisture content in the print pastes can be reduced.

Process for producing transfer printing papers with foamed aqueous ink

Transfer printing supports impregnated or printed with a formulation containing a dyestuff of the formula I ##STR1## in which R.sup.1 is alkyl having from 1 to 4 carbon atoms, R.sup.2 is hydrogen or has the meaning of R.sup.1, R.sup.3 is methyl, methoxy or ethoxy, and R.sup.4 is hydrogen, methyl, methoxy or ethoxy, or containing mixtures of such dyestuffs, a process for the manufacture of these supports, which comprises impregnating or printing the support material with formulations containing a dyestuff of the formula I or mixtures of such dyestuffs, and the use of these supports for the dyeing and printing of flat web or sheet structures of synthetic or natural materials according to the heat transfer printing process.

Transfer printing support, process for the manufacture thereof, with

Transfer-printing supports, which are impregnated or printed with a formulation containing a mixture of a blue disperse dyestuff which sublimes readily and has the formula ##STR1## in which X is hydrogen or halogen, R, R.sup.1 and R.sup.2 denote alkyl with 1 to 4 carbon atoms and R.sup.3 denotes hydrogen or alkyl with 1 to 4 carbon atoms, and yellow to red disperse dyestuffs which sublime readily, give deep and fast black dyeings on polyester materials and polyester mixed materials by the heat transfer-printing process.

Growing community of inventors

Hofheim am Taunus, Germany

Claus Schuster