Dye-containing pellets for coloring keratin fibers

US7670391B2 · kind B2 · utility

Assignee

• Wella GmbH · DE

Inventors

• Juergen Schmenger · Weiterstadt, DE
• Petra Braun · Munster, DE
• Wolfram Englisch · Rabenau, DE

Key dates

• Filing date: Apr 15, 2008
• Grant date: Mar 2, 2010
• Expiry date: Apr 15, 2028

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K8/0216
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The dust-free coated dye-containing pellet is a granulated carrier material that is encapsulated with a dye-containing coating material. The dye-containing coating material contains a mixture of a water-soluble or water-dispersible film-former with at least one direct dye and/or at least one oxidation dye precursor. Preferred carrier materials include dextrose, oligosaccharides and cellulose compounds. The dust-free coated dye-containing pellet is preferably made by granulating the carrier material together with optional antioxidants and auxiliary agents, heating the resulting granulate at no more than 34° C., subsequently coating the granulate by spraying it with a solution or dispersion of the coating material and optionally drying as needed.