Patent ID: 6528045
Filing Date: 2003-03-04
Classification: A61K,A61Q

Abstract:
Process for the preparation of stable, aqueous hair dyeing emulsions, comprising at least one oxidation dyestuff precursor, whereby a water-in-oil emulsion (A), comprisinga) 10% to 50% by weight, of at least one nonionic emulsifier, b) 10% to 50% by weight, of at least one nonionic co-emulsifier selected from the group of C10-C22-fatty alcohols, C12-C18-fatty acid mono-and dialkanolamides, and C10-C22-fatty acid esters with polyvalent alcohols, c) 5% to 40% by weight of oleic acid, and d) up to 25% of water, each calculated to the total water-in-oil emulsion composition, is mixed with an aqueous phase (B), comprising at least one water-soluble surfactant, under shear force at 15Â° to 30Â° C.