公开(公告)号：US11540992B2

公开(公告)日：2023-01-03

申请号：US17271129

申请日：2019-08-13

Applicant: L'OREAL

Inventor： Tomotaka Michitsuji ,  Celine Bossard ,  Dhimoy Roy ,  Maxime De Boni

IPC: A61Q5/10 ,  A61K8/46 ,  A45D19/00 ,  A61K8/44 ,  A61Q5/06

Abstract: The present invention relates to a process for coloring keratin fibers, preferably hair, comprising the steps of: (i) applying onto the keratin fibers a composition comprising (a) at least one compound chosen from alkylaminosulfonic acids and those of the formula (I) and (II), (b) at least one direct dye, and (c) at least one alkaline agent; (ii) heating the keratin fibers; and (iii) optionally rinsing and/or drying the keratin fibers. The present invention can provide superior coloring efficiency, such as color intensity and color lastingness.