Back to results
US 8,772,545 B2Granted
Rinsable dyes and methods for their preparation
AssigneeSpectra Colors Corp.
InventorsMark Berenfeld, Sal Harfouch, Peter Caputo
Life of this patent
Estimating the term…
Abstract
Rinsable dyes with improved fugitivity are formulated by attaching dyestuff compounds with amine-capped sulfonic solubilizing groups to commercially available ethoxylated aniline, so that the surfactant effect of the ethoxylated aniline counteracts the substantivity of the dyestuff compound, while the neutralization of the sulfonic solubilizing groups reduces substantivity.
Claims3
A method of preparing a rinsable dye, comprising the following steps:
- (a) providing an organic sulfonic acid, comprising sulfonic acid molecules which each contain one or more sulfonic groups and an aryl-aldehyde functional group;
- (b) providing a polyalkyleneoxylated tertiary aryl amine, comprising polyalkyleneoxylated tertiary aryl amine molecules;
- (c) reacting the polyalkyleneoxylated tertiary aryl amine with the organic sulfonic acid so as to attach two of the polyalkyleneoxylated tertiary aryl amine molecules to each of the sulfonic acid molecules, thereby forming triarylmethane molecules;
- (d) oxidizing the triarylmethane molecules so that one or more of the sulfonic groups become sulfonic ions (SO3−);
- and
- (e) capping the sulfonic ions in the triarylmethane molecules with an amine or amine salt group.
3 more elements
Dependencies are inferred from the claim text.