Patent ID: 8664324

Claim:
A copolymer made by nitroxide mediated controlled polymerisation comprising, at least one monomer (MA r ) selected from unsaturated monomers out of the group of acrylates, methacrylates, acrylamides, methacrylamides, styrenic monomers, at least one monomer (MB s ) selected from unsaturated monomers out of the group of acrylates, methacrylates, acrylamides, methacrylamides, styrenic monomers wherein the monomer MB has a quaternized N-atom structure with a polar substituent selected from polyether, polyamine, nitrile, amide, imine, imide, ester, ketone, nitrile, aldehyde, diketone, ketoester, ketoamide, carbonate, carbamate, carbamide, sulfoxide, sulfone, carboxylic acid, sulfonic acid, phosphoric acid groups; or carboxylic acid anion, sulfonic acid anion or phosphoric acid anion groups which is formed as betaine structure, wherein r denotes the total number of monomers MA within the structural element (MA r ) and r is >5; s denotes the total number of monomers MB within the structural element (MB s ) and s is >1, a fragment In of an initiator In-E capable to initiate radical polymerisation, and a group E bearing at least one stable free nitroxyl radical which is bound via the oxygen atom to the copolymer.