Permanent coloring of hair using carbonate salts and bicarbonate salts and using percarbamic acid precursors

US6821302B2 · kind B2 · utility

Assignee

• Unilever Home & Personal Care USA, Division of Conopco, Inc. · US

Inventors

• Van Au · Oxford, US
• Stephen A. Madison · New City, US
• John Brian Bartolone · Bridgeport, US

Key dates

• Filing date: Nov 1, 2002
• Grant date: Nov 23, 2004
• Expiry date: Jun 28, 2023

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K8/40
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Compositions and methods for achieving permanent hair color change which composition includes a mixture of:a) a composition A which comprises:i) at least one oxidation hair dye precursor;ii) a metal cyanate selected from the group consisting of KOCN, NaOCN, LiOCN, Ca(OCN)2, Mg(OCN)2, Zn(OCN)2 and mixtures thereof which comprises a cyanate ion at about 0.1 to about 2.5%; andiii) an alkalizing agent;b) and a composition B which comprises:i) an oxidizing compound;wherein the mixture of composition A and composition B has a pH of about 7 to about 11;are described.