Oxidation of vat and sulfur dyes with vanadate activated bromate or iodate
AssigneeOlin Corporation
InventorRichard L. Doerr
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Abstract
An improved process for oxidizing vat or sulfur dyes is provided wherein the reduced form of the dye is oxidized by contact with an aqueous oxidizing solution comprising an alkali metal or ammonium vanadate and an oxidant comprising an alkali metal or ammonium bromate or iodate.
Claims6
In a process for oxidizing vat or sulfur dyes present in reduced form on cotton or regenerated cellulose textile fibers by contacting said dye with an aqueous solution of an oxidizing agent comprising an alkali metal bromate or iodate, the improvement wherein said aqueous solution consists essentially of said oxidizing agent and .005 to 5% by weight alkali metal or ammonium vanadate, has a pH in the range of 3-6 and contacts said dye at a temperature of 75.degree.-200.degree.F.
Dependencies are inferred from the claim text.