Patent ID: 6413703
Filing Date: 2002-07-02
Classification: G03C

Abstract:
One-part color developer concentrate which contains 50 to 700 mmol/l of at least one color developer substance, at least one antioxidant, at least one water softener, a buffer system, alkali and contains at most 0.1 mol of sulfate ions/L, wherein the concentrate is a multi-phase concentrate and the color developer substance is 4-(N-ethyl-N-2-methylsulfonylaminoethyl)-2-methylphenylenediamine or 4-(N-ethyl-N-2-hydroxyethyl)-2-methylphenylenediamine, said color developer substance essentially being present as free base or as phosphate and the concentrate contains one or more water-soluble organic solvents, 50 to 95 wt. % of the total of water and solvent is water, and the concentrate contains 50 to 700 mmol of color developer substance/L and the concentrate contains two or more liquid phases, but no precipitation.