Patent ID: 8906986

Claim:
A copolymer comprising: a) 16 to 95 mol % of a cationic structural unit (A), b) 5 to 55 mol % of a macromonomeric structural unit (B), and c) up to 80 mol % of a structural unit (C), d) up to 80 mol % of a structural unit (D) other than the structural unit (C), wherein the structural unit (A) includes at least one unit of at least one of formula (I) or formula (II): wherein R 1 in each occurrence is the same or different and represents hydrogen and/or methyl, R 3 , R 4 and R 5 in each occurrence are the same or different and each independently represent hydrogen, an aliphatic hydrocarbonaceous moiety having 1 to 20 carbon atoms, a cycloaliphatic hydrocarbonaceous moiety having 5 to 8 carbon atoms and/or aryl having 6 to 14 carbon atoms or polyethylene glycol, Y in each occurrence is the same or different and represents oxygen, —NH and/or —NR 3 , V in each occurrence is the same or different and represents —(CH 2 ) x —, wherein x in each occurrence is the same or different and represents an integer from 1 to 6, and X in each occurrence is the same or different and represents a halogen atom, C 1 - to C 4 -alkyl sulfate and/or C 1 - to C 4 -alkyl sulfonate.