Method for gentle, chemical hair treatment

A method for the chemical treatment of keratinic fibers, comprising:

• i. applying a cosmetic composition to keratinic fibers as a pretreatment, and
• ii. chemically treating the keratinic fibers with an oxidizing agent and/or a reducing agent within a period of from about 5 seconds to about 24 hours after step i, wherein;
• the cosmetic composition, based on its total weight, comprises from about 0.01 to about 4.00 by weight of a polyorganosiloxane of the formula (I)
• wherein
• X1 and X2 independently of one another denote OH, OR1, R2, O-PDMS or O-fSiloxane,
• X3 denotes hydrogen or a monovalent hydrocarbon radical having 1 to 8 carbon atoms per radical, PDMS or fSiloxane,
• X4 is a radical of the formula
• and
• a is an integer from 1 to about 100,
• wherein
• R1 denotes an alkyl radical having 1 to 8 carbon atoms,
• R2 denotes a monovalent, saturated or unsaturated hydrocarbon radical having 1 to about 200 carbon atoms per radical, optionally substituted with the elements N, P, S, O, Si and halogen,
• PDMS stands for
• fSiloxane stands for
• R3 independently of one another each denotes a monovalent, saturated or unsaturated hydrocarbon radical having 1 to about 200 carbon atoms per radical, optionally substituted with the elements N, P, S, O, Si and halogen,
• A denotes a radical of the formula R6—[NR7—R8-]fNR72,
• wherein
• R6 denotes a divalent linear or branched hydrocarbon radical having 3 to about 18 carbon atoms,
• R7 denotes a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or an acyl radical,
• R8 denotes a divalent hydrocarbon radical having 1 to 6 carbon atoms,
• b is an integer from 1 to about 2000,
• c is 0 or a number from 1 to about 2000,
• d is an integer from 1 to about 1000,
• e is 0 or a number from 1 to 5,
• f is 0, 1, 2, 3 or 4,
• Z denotes hydrogen, an alkyl radical having 1 to 8 carbon atoms or
• R4 denotes a monovalent hydrocarbon radical having 1 to about 18 carbon atoms, optionally comprising N and/or O atoms, and
• R5 denotes a divalent hydrocarbon radical having 3 to about 12 carbon atoms, optionally comprising N and/or O atoms.