Preparation of dye cyanides
OwnerLyman Chalkleyinventor
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Abstract
Cyanides of amino triarylmethane dyes are prepared by the reaction of dye bases with hydrogen cyanide. The hydrogen cyanide may be provided in gaseous or liquid form or derived from a cyanohydrin.
Claims10
The process of preparation of an amino triarylmethane dye cyanide by reaction of an amino triarylmethane dye base with hydrogen cyanide in absence of additional acid.
The process of preparation of an amino triarylmethane dye cyanide consisting in the steps of conversion of an amino triarylmethane dye into a dye base by admixture in a non-acidic solvent with a tertiary aliphatic amine followed by reaction of said dye base with hydrogen cyanide in absence of additional acid.
Dependencies are inferred from the claim text.