Wella Aktiengesellschaft

Cècile Pasquier

Hans-Juergen Braun

Patrick Wyss

Laurent Chassot

Juergen Allwohn

David Rozzell

Guido Sauter

Vèronique Buclin-Charrière

Pro-dyes of direct dyes having an enzymatically-labile functionality, e.g. glutaramide derivatives of direct dyes of formula (I) or their physiologically acceptable salts, are described, as well as compositions for dyeing keratinous fibers containing these pro-dyes, as well as compositions for dyeing keratinous fibers containing a combination of at least one pro-dye and at least one enzyme capable of cleaving the glutaramide functionality in the pro-dye. A method for dyeing keratinous fibers with the aforementioned dyeing compositions is also described.

Compositions and methods for dyeing keratinous fibers

The object of the present patent application are 3-aminophenol derivatives of formula (I) or the physiologically tolerated, water-soluble salts thereof wherein R denotes a heterocyclic aromatic 5-membered ring of formula (Ia) and colorants based on a developer-coupler combination and containing these compounds.

M-aminophenol derivatives and coloring agents containing them

The object of the present patent application are agents for dyeing keratin fibers based on a developer-coupler combination and characterized in that they contain at least one 3-aminophenol derivative of formula (I) or a physiologically compatible, water-soluble salt thereof wherein  

Oxidation hair dyes containing 3-aminophenol derivatives, and novel 3-aminophenol derivatives

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Marly, Switzerland

Cècile Pasquier