Comb-shaped copolymers based on acryoyldimethyl taurine acid

A water-soluble or water-swellable copolymer obtainable by free-radical copolymerization of

• A) acryloyldimethyltaurine and/or acryloyldimethyltaurates,
• B) if desired, one or more other olefinically unsaturated, noncationic, optionally crosslinking comonomers containing at least one oxygen, nitrogen, sulfur or phosphorus atom and possessing a molecular weight of less than 500 g/mol,
• C) if desired, one or more olefinically unsaturated, cationic comonomers containing at least one oxygen, nitrogen, sulfur or phosphorus atom and possessing a molecular weight of less than 500 g/mol,
• D) if desired, one or more at least monofunctional, silicon-containing components capable of free-radical polymerization,
• E) if desired, one or more at least monofunctional, fluorine-containing components capable of free-radical polymerization,
• F) if desired, one or more mono- or polyolefinically unsaturated, optionally crosslinking macromonomers each possessing at least one oxygen, nitrogen, sulfur or phosphorus atom and having a number-average molecular weight of greater than or equal to 200 g/mol, the macromonomers not being a silicon-containing component D) or fluorine-containing component E),
• G) the copolymerization taking place in the presence or absence of at least one polymeric additive having number-average molecular weights of from 200 g/mol to 109 g/mol,
• H) with the proviso that component A) is copolymerized with at least two components selected from at least two of the groups C) to F).