Process for colouring hair keratin fibers, comprising the application of a composition comprising at least one (poly)carbodiimide compound and a composition comprising at least one associative polymer and a particular compound

Process for colouring hair keratin fibers, comprising the application of a composition A and a composition B to said hair keratin fibers, in which:

• composition A comprises at least one (poly)carbodiimide compound chosen from the compounds of formula (II) below:
• in which:
• X1 and X2 independently represent an oxygen atom;
• R1 and R2 are independently chosen from dialkylamino alcohols, alkyl esters of hydroxycarboxylic acid and monoalkyl ethers of (poly)alkylene glycol, in which a hydroxyl group has been removed, and mixtures thereof;
• n and z denote an integer ranging from 1 to 20, with n+z≥2 and w is equal to 1;
• L1 is chosen from a C1-C18 divalent aliphatic hydrocarbon-based radical, a C3-C15 cycloalkylene radical, a C3-C12 heterocycloalkylene group or a C6-C14 arylene group, and mixtures thereof;
• E independently represents a group chosen from:
• —O—R3—O—;
• —S—R4—S—;
• and —R5—N(R6)—R4—N(R6)—R5—;
• in which R3 and R4 are independently chosen from a C6-C14 arylene radical, a C3-C12 cycloalkylene radical, a linear or branched C1-C18 alkylene radical, optionally interrupted with one or more heteroatoms, and mixtures thereof;
• R5 independently represents a covalent bond or a saturated divalent hydrocarbon-based radical, optionally interrupted with one or more heteroatoms;
• and when R5 is not a covalent bond, R5 is chosen from a C6-C14 arylene radical, a C3-C12 cycloalkylene radical, a linear or branched C1-C18 alkylene radical, optionally interrupted with one or more heteroatoms, and mixtures thereof;
• and
• R6 is chosen from a C6-C14 arylene radical, a C3-C12 cycloalkylene radical, a linear or branched C1-C18 alkylene radical, optionally interrupted with one or more heteroatoms, and mixtures thereof;
• and
• composition B comprises:
• at least one associative polymer;
• at least one compound, different from the at least one associative polymer, containing at least one carboxylic acid group;
• and
• at least one compound containing at least one hydroxyl function;
• composition A and/or composition B comprising at least one colouring agent chosen from pigments, direct dyes and mixtures thereof, and
• in which composition A and composition B are applied simultaneously or sequentially to the hair keratin fibers.