Siloxanes containing guanidino groups and use thereof for cosmetic formulations

A polysiloxane containing guanidino groups and of the general formula (I)

• in which the radicals
• R1 are identical or different and are an optionally branched hydrocarbon radical which optionally contains double bonds and has 1 to 30 carbon atoms or phenyl radicals or —OR11 or —OH,
• R2 can in part have the meaning of the radicals R1 and the other radicals R2, independently of one another, are radicals of the formulae (Ia, Ib or Ic)
• R2=-M-G (Ia)
• R2=-M-Q+A− (Ib)
• R2=-(M)x-S (Ic)
• with the proviso that, in the average molecule, at least one radical R2 is a radical of the formula -M-G (Ia),
• in which
• G is a guanidino group with the general formula (Ia1, Ia2)
• and/or salts or hydrates thereof, in which
• R3a) independently of the others, is hydrogen or an optionally branched hydrocarbon radical optionally comprising double bonds,
• R3′ may be R3 or an alkylene group which is joined to M via carbon atoms or heteroatoms and in so doing forms a 5- to 8-membered ring, and
• M is a divalent or polyvalent hydrocarbon radical having at least 4 carbon atoms which has one hydroxyl group and which can be interrupted by one or more oxygen atoms or nitrogen atoms or quaternary ammonium groups or ester or amide functions,
• Q+ is a radical of the formula (Id)
• R4, R5 are alkyl radicals having 1 to 4 carbon atoms,
• R6 is
• R7 may be a monovalent hydrocarbon radical having 1 to 22 carbon atoms,
• y is 0to 6
• z is 0 or 1,
• A− is an inorganic or organic anion which originates from a customary physiologically compatible acid HA,
• S is H, a polyalkylene oxide polyether of the general formula CmH2mO(C2H4O)n(C3H6O)oR8
• in which
• m is 1 to 6,
• n,o independently of one another are 0 to 100 and the polyether has a molecular weight between 100 and 6000 g/mol and
• R8 is H or an optionally branched aromatic or alicyclic hydrocarbon radical optionally containing double bonds and having 2 to 30 carbon atoms, or a UV-absorbing group,
• R11 is an aliphatic or aromatic hydrocarbon radicals having 1 to 30 carbon atoms which are optionally branched or H.
• x is 0 or 1 and
• a independently of the others has a value of from 8 to 1000, and
• b has a value from 0 to 10.