U.S. 8,110,010 B2 Henkel AG & Co. KGaA has obtained a patent for an agent for coloring keratinic fibers comprised of at least one particulate component having a particle core containing at least one oxidation dye precursor product and a casing surrounding the core, wherein the casing is comprised of at least one encapsulation material chosen from homo- and/or copolymers of methacrylic acid and/or of methacrylic acid esters (methacrylates), and/or homo- and/or copolymers of vinyl acetate, and at least one release agent. Source: coatingsworld
Source:
http://www.coatingsworld.com/issues/2012-05/view_patents/coated-coloring-agents/
