Use of colorants for recording fluids
AssigneeHoechst Aktiengesellschaft
InventorsJosef Ritter, Alexander Sieber
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Abstract
The invention relates to a method using water-soluble dyestuffs for coloring recording fluids, particularly in the ink jet process, wherein the dyestuffs in the form of the free acid have the general formula A--(SO.sub.2 -X).sub.p. The dyestuffs (I) can be prepared analogously to methods for preparing known vinylsulfone or .beta.-sulfatoethylsulfone dyestuffs which are further reacted with nucleophiles R.sup.1 OH, HNR.sup.1 R.sup.2, HSR.sup.1 etc. Some of the reaction products are novel dyestuffs.
Claims13
A method for the dyeing of a recording fluid using a water-soluble dye, consisting essentially of the step of dissolving in a liquid medium a water-soluble dye, wherein the dye in the form of the free acid has the formula (I) ##STR18## in which X stands for a radical of the formula --CH.sub.2 CH.sub.2 OR.sup.1, in which R.sup.1 denotes a cycloalkyl, aryl or aralkyl radical or a substituted or unsubstituted radical of an aliphatic or aromatic heterocyclic system and wherein the resulting recording fluid contains from 0.1% to 20% by weight of the dye of the formula (I), relative to the weight of the recording fluid.
Dependencies are inferred from the claim text.