Compositions comprising menthol compounds as smoothing agents

A method of permanent hair dyeing, comprising the following steps

• (i) mixing all the components of a composition consisting of:
• (a) menthol compounds corresponding to formulas (I), (II) and/or (III)
• in which X represents —Y or —COZ and Y represents the following groups:
• (i)
• a linear or branched alkyl or hydroxyl alkyl radical containing
• 1 to 6 carbon atoms or an allyl radical;
• (ii)
• a hydroxy or dihydroxyalkyl radical containing 1 to 6 carbon
• atoms;
• (iii)
• a radical —OCR1;
• (iv)
• a radical —OCO(M)OH;
• (v)
• a radical —OCO—S;
• (vi)
• a radical —OC(CH2)nCOR2;
• wherein
• M
• represents a linear or branched alkyl and/or alkenyl radical
• containing 1 to 10, preferably, 1 to 4 carbon atoms;
• S
• represents a carbohydrate radical containing 5 to 12 carbon
• atoms, preferably, a fructose, a glucose or a sucrose radical;
• n
• stands for 0 or for numbers of 1 to 6, preferably, of 2 to 3;
• R1
• represents a linear or branched alkyl- or hydroxyl alkyl radical
• containing 1 to 6, preferably, 1 to 2 carbon atoms or an allyl
• radical;
• R2
• represents a hydroxyl radical or a radical —NR3R4;
• R3
• and R4, independently of one another, represent hydrogen or a
• linear or branched alkyl or hydroxyl alkyl radical containing
• 1 to 6, preferably, 1 to 2 carbon atoms,
• while Z represents the following groups:
• (vii)
• a radical NR5R6, or
• (viii)
• a radical NHR7,
• wherein
• R5, R6
• independently of one another, represent hydrogen or a linear
• or branched alkyl or hydroxyl alkyl radical containing 1 to
• 6, preferably, 1 to 2 carbon atoms, a phenyl radical or an
• alkoxyphenyl radical containing 1 to 6, preferably, 1 to 2
• carbon atoms in the alkoxy radical;
• R5, R6, R7
• represent a radical —(CH2)nCOOR8;
• R8
• represents a linear or branched alkyl or hydroxy alkyl
• radical containing 1 to 6, preferably, 1 to 2 carbon atoms,
• and
• n
• stands for 0 or for numbers of 1 to 10, preferably, of 1 to 4,
• and
• (b) a cosmetically acceptable carrier, and
• (c) a hair colouring formulation and/or a hair straightening formulation having a pH of from 6.5 to 12;
• and consisting of
• (c-1) at least one separately provided oxidizing agent, and
• (c-2) at least one oxidation base, and
• (c-3) at least one synthetic dye, and/or
• (c-4) at least one natural dye,
• wherein the composition is in the absence of menthofuran, and applying the obtained mixture onto the hair of a person having a sensitive scalp:
• (ii) leaving the mixture of step (i) on the hair for a defined time;
• then
• (iii) rinsing the hair.