Process for preparing p-phenylenediamine color developers in...

G - Physics – 03 – C

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G03C 7/413 (2006.01) G03C 5/26 (2006.01)

Patent

CA 2462605

An improved method for making a p-phenylenediamine color developeer concentrate in a free-base form wherein the sulfate or chloride salt of the color developer is contacted with an alkali metal hydroxide includes the steps of forming a liquid free-base layer and a water layer, separating the liquid free-base layer from the water layer; and mixing the liquid free-base with a water soluble hydroxy organic solvent, wherein the p-phenylenediamine color developer concentrate has at least 0.06 mol/l of a color developing agent in the free base form.

L'invention concerne un procédé amélioré de production de concentré de révélateur chromogène constitué de p-phénylènediamine sous forme de base libre, procédé selon lequel le sel de sulfate ou le sel chloré du révélateur chromogène est mis en contact avec un hydroxyde alcalin. Ledit procédé comprend les étapes consistant à: former une couche de base libre liquide et une couche d'eau; à séparer la couche de base libre liquide de la couche d'eau; et à mélanger la base libre liquide à un solvant organique hydroxy soluble dans l'eau; le concentré de révélateur chromogène constitué de p-phénylènediamine présentant au moins 0,06 mol/l d'un agent de développement chromogène sous forme de base libre.

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