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US 12,226,515 B2Granted
Method for colouring hair including pretreatment
AssigneeWella Operations US, LLC
InventorsLars Siegfried Dahne, Mandy Hecht, Mathias Kurt Herrlein, Katrin Kaestle, Bryan Patrick Murphy, Monica Jo Patten
Life of this patent
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Abstract
Method for colouring hair comprising pretreating the hair with at least one primer composition before treating the hair with a polymeric hair colouring system.
Claims7
A method for colouring hair comprising:
- carrying out the following sequence of steps:
- a) in advance of coloring the hair, pretreating the hair with at least one non-polymeric primer composition to form modified hair,
- wherein the non-polymer primer composition comprises an oxidizing agent in combination with a pH of at least 9 and a surfactant, and the non-polymer primer composition does not comprise a dyestuff, a chromophore, a fluorophore, an oxidative dye primary developer, an oxidative dye coupler or a direct dye,
- b) optionally repeating step a) at least once,
- c) treating the modified hair with a hair colouring system comprising a first composition having a pH of from 7 to 9 and at least one cationic polymer having at least one covalently bonded pendant and/or in-chain chromophore and/or fluorophore to form a cationic polymer layer on the modified hair,
- d) overlaying the layer of cationic polymer on the modified hair with a second composition having a pH of from 5 to 6 and at least one anionic polymer optionally having at least one covalently bonded pendant and/or in-chain chromophore and/or fluorophore to form a dual polymeric layer on the modified hair.
3 more elements
Dependencies are inferred from the claim text.