Patent ID: 8066864

Claim:
A polymer having at least partially cross-linked polymeric main chains constructed from repeat units of the general formula I and optionally repeat units of the general formula II with A selected from the group consisting of O, S, and NH, R 1 , respectively independently of each other, selected from the group consisting of straight-chain or branched C 1 to C 8 alkyl, straight-chain or branched C 1 to C 8 hydroxyalkyl and straight-chain or branched C 1 to C 8 hydroxyalkoxy and R 2 , respectively independently of each other, selected from the group consisting of straight-chain or branched C 1 to C 8 alkylene, straight-chain or branched C 1 to C 8 hydroxyalkylene and straight-chain or branched C 1 to C 8 alkyleneoxy, R 3 , respectively independently of each other, R 1 , R 2 , a repeat unit of the general formula II or III and/or a single bond, X − , respectively independently of each other, an ion which is suitable as counter-ion to the quaternary ammonium ion, x=2 or 3, and also optionally repeat units of the general formula III R 4 being selected from the group of five- or six-membered aza aromatics or nitrogen-containing heterocycles with at least two nitrogen atoms or the substituted derivatives thereof and y=1 to 6, wherein via at least respectively one of the radicals R 3 of two repeat units of the general formula I, a cross-linking of the main chains exists.