Method for coating keratin fibers

A method for producing a colored coating on surfaces of keratin fibers comprising

• priming the keratin fibers with a Praeparatur technique to remove sebum and associated substances on the keratin fiber surfaces and deep cleaning the keratin fibers with a Fundamenta technique to remove fatty acid F layers of the keratin fiber surfaces;
• applying to the primed and deep cleaned keratin fibers a pretreatment composition to form a pre-coating layer on the keratin fibers;
• and
• applying to the pre-coating layer on the keratin fibers an aza Michael film forming composition to form a composite film of a layer of the aza Michael film forming composition overlaid on the pre-coating layer on the keratin fibers;
• and,
• converting the composite film to the colored coating on the keratin fibers;
• wherein
• the pretreatment composition comprises an aqueous-alcoholic cosmetic carrier and an organosilicon compound of Formula I
• H2N-L-Si(OR3)3 Formula I
• wherein L is a linear divalent C I-C4 alkylene group and R3 is methyl, ethyl or propyl;
• the aza Michael film forming composition comprises an aqueous-alcoholic cosmetic carrier, one or more pigments, a Michael binder comprising a silicone polymer having α,β-unsaturated alkenoyloxy groups according to Formula IV
• H2C═CHCOOCH2CHOH—CH2—O—(CH2)c—SiMe2O—(SiMe2O)m—[MeSiO—(—(CH2)c—O—CH2—CHOH—CH2OOC—CH═CH2)]g(Me2SiO)p—OSiMe2-(CH2)c—O—CH2—CHOHCH2OOCCH═CH2 Formula IV
• wherein c is an integer of 1 to 6, m and p in Formula IV are each independently an integer of from 5 to 100, g is zero or an integer of from 1 to 10,
• and an aza linker comprising a silicone polymer, according to Formula V
• M1-(SiMe2O)o(SiMe2O-A)p-M2 Formula V
• wherein M1 is Me3SiO or A-SiMe2O and M2 is Si(OR3)3, o is an integer of from 2 to 100, p in Formula V is an integer of from I to 10, R3 in Formula V is methyl, ethyl or propyl and A is H2N—(R10NH)r—R11—
• with R10 being a C2-C4 alkylenyl group, r being zero or an integer of 1 to 3 and R11 being a linear C2-C5 alkylenyl group;
• wherein the Michael binder and aza linker are each linear and the number of Michael binder α,β-unsaturated alkenoyloxy groups is in excess of the number of aza linker H2N— groups;
• wherein the Praeparatur technique comprises contacting the keratin fibers with an aqueous-alcoholic composition of an anionic surfactant selected from an alkali metal salt of a C8-C16 alkyl sulfate or a PEG 2 to PEG 20 C8-C16 alkyl sulfate or a PPG 2 to PPG 5 C8-C16 alkyl sulfate at a concentration of from 10 wt % to 30 wt % relative to the total weight of the aqueous-alcoholic composition and wherein the aqueous-alcoholic composition is free of any conditioning additive;
• wherein the Fundamenta technique comprises contacting the keratin fibers with one of a cold plasma discharge of partially ionized air, oxygen and/or nitrogen, an oxidizing agent or a phase transfer tenside or any combination thereof;
• and,
• wherein the Michael binder combines in situ with the aza linker to crosslink through the Aza-Michael addition, the Si(OR3)3 groups of the organosilicon compound of Formula I self-condense to form Si—O—Si linkages and the Si(OR3)3 groups of the organosilicon compound of Formula I and the aza linker of Formula V interact to form Si—O—Si linkages.