METHOD OF DECOLOURING OR DYING KERATIN FIBERS USING AN OXIDATIVE COMPOSITION AND UV-VISIBLE RADIATION Russian patent published in 2020 - IPC A61K8/19 A61K8/22 A61K8/23 A61Q5/08 A61Q5/10 

FIELD: cosmetic industry.

SUBSTANCE: group of inventions relates to a method of decolouring or dying keratin fibers, such as hair, involving: (i) a step of applying on said fibers a composition containing one or more chemical oxidants in amount of 2–10 wt % relative to total weight of oxidising composition, (ii) a step of irradiating said UV-visible radiation with fibers at 365 nm, 385 nm or 405 nm (± 10 nm) and an energy density ranging from 100 to 2000 J/cm² after application of said composition; (iii) if the method is a method of dyeing keratin fibers, the method also uses one or more oxidative dyes, and relates to a method of decolouring or dying keratin fibers, such as hair, involving: (i) a step of applying on said fibers a composition containing one or more chemical oxidants in amount of 2–10 wt % relative to total weight of oxidising composition, (ii) irradiating keratin fibers with one or more diodes characterized by energy density in range of 100 to 2000 J/cm² after application of said composition, if the method is a method of dyeing keratin fibers, the method also uses one or more oxidative dyes.

EFFECT: group of inventions provides more efficient decolouration in shorter processing time, using a smaller amount of oxidants.

14 cl, 3 ex