Patent ID: 7030275

Claim:
A monomer compound comprising several cationic groups having the following formula: wherein R 1 is a hydrogen atom, a methyl group or an ethyl group, A, which is identical or different, is a group comprising an ester group of formula —A 1 —C(O)—O—A 2 —, or an amide group of formula —A 1 —C(O)—NR 10 —A 2 —, wherein: R 10 , which is identical or different, is hydrogen or an alkyl, hydroxyalkyl, or aminoalkyl C 1 –C 6 linear or branched group, A 1 , which is identical or different, is a covalent bond or a group of formula (CH 2 ) p1 — wherein p1 is an integer of from 1 to 6, A 2 , which is identical or different, is a linear or branched hydrocarbon group comprising optionally N, O, or S heteroatoms or heterogroups, optionally substituted, optionally forming or comprising a cycle, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 , which are identical or different, are hydrogen, alkyl, hydroxyalkyl, or aminoalkyl C 1 –C 6 linear or branched groups, or, if inside the brackets, form a heterocycle with group A2, m is an integer of from 1 to 10, n is an integer of from 1 to 6, Z is —O—, —C(O)O—, or —C(O)NH—, B is a linear or branched C 2 –C 12 polymethylene chain, optionally comprising heteroatoms or heterogroups, and optionally substituted with one or several hydroxy or amino groups, and X − , which are identical or different, are counter ions.