UV-light-absorbing quaternary polysiloxanes

A UV-light-absorbing quaternary polysiloxane of the general formula (I)

• in which the radicals
• R1 are identical or different and are in each case alkyl radicals having 1 to 22 carbon atoms or phenyl radicals,
• 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 or Ib)
• R2=-M-S (Ia)
• or
• R2=-M-Z+A− (Ib)
• with the proviso that, in the average molecule, at least two radicals R2 are in each case a radical of the formula -M-S and -M-Z+A−,
• in which
• S is a monovalent chromophore radical responsible for the UV absorption and
• Z+ is a radical of the formula (Id)
• R6, R7 are alkyl radicals having 1 to 22 carbon atoms or alkenyl radicals having 2 to 22 carbon atoms, in which the alkyl or alkenyl radicals can have hydroxyl groups,
• R8 is
• R9 may be a monovalent hydrocarbon radical having 1 to 22 carbon atoms, or
• is a monovalent chromophore radical responsible for the UV absorption,
• x=0 to 6,
• y=0 or 1 and
• M is a divalent hydrocarbon radical having at least 4 carbon atoms, which has a hydroxyl group and which may be interrupted by one or more oxygen atoms,
• A− is an inorganic or organic anion which originates from a customary physiologically compatible acid HA,
• a independently of the others has a value of from 1 to 200 and
• b has a value of from 0 to 10.