Patent ID: 7253279
Filing Date: 2007-08-07
Classification: C07C,C08F,C09B

Abstract:
1. A process for preparing reduced halide-content azine dye-based compounds comprising the steps of: (A) contacting at least one halide-containing azine dye-based compound with a basic ion exchange resin capable of absorbing halide anions and donating hydroxide anions to produce a halide-enriched ion exchange resin and a quantity of azine dye-based hydroxide compound, wherein said at least one halide-containing azine dye-based compound has the general formula: wherein Y is selected from the group consisting of S, O, or NR*, where R* is selected from the group consisting of hydrogen, and saturated, unsaturated and substituted hydrocarbons; R X comprises at least one halide anion selected from the group consisting of chloride, bromide, iodide, and fluoride; and (B) contacting said quantity of azine dye-based hydroxide compound, within no more than about 48 hours of termination of step (A), with an acid compound capable of removing the hydroxide and donating an anion to form a quantity of reduced halide-content azine dye-based compound having no greater than 4 weight percent of non-covalently bound halide, based on the total dry weight of said reduced halide-content azine dye-based compound.