Die Erfindung betrifft ein verbessertes Verfahren zur Herstellung von in wässrigem Medium löslichen Polymeren auf (Meth)acrylat-Basis, die sich vor allem als assoziative und nichtassoziative Verdicker einsetzen lassen.Producing polymerizate comprises polymerizing monomers of a polymer A or B partially or virtually completely, and adding the monomers of respective other polymer, subsequently polymerizing the monomers of respective other polymer and the partially polymerized polymer A or B, or polymerizing the virtually completely polymerized polymer A or B, with the formation of a mixture of polymer A and polymer B. The polymerizate includes mixture of polymer A including e.g. alkyl-methacrylate, methacrylic acid, and polymer B including e.g. a monomer carrying an amide group and optionally other monomers. Producing polymerizate comprises polymerizing monomers of a polymer A or B partially or virtually completely, and adding the monomers of respective other polymer, subsequently polymerizing the monomers of respective other polymer and the partially polymerized polymer A or B, or polymerizing the virtually completely polymerized polymer A or B, with the formation of a mixture of polymer A and polymer B. The polymerizate includes the mixture of at least one polymer A and at least one polymer B, where (A) polymer A comprises (in wt.%): (a1) alkyl-methacrylate having 1-4C (30-70), (a2) methacrylic acid (30-70), (a3) monomers substituted with 8-30C (0 -20), (a4) monomers more different from (a1) to (a3) (0 -20), and (B) polymer B comprises (in wt.%): (b1) at least one monomer carrying at least one amide group, and (b2) optionally other monomers different from the (b1), where the components of the polymers A and B are present in a copolymerized form. and (B) Polymer B comprises in copolymerized form. Independent claims are also included for (1) the polymerizate obtainable by the above method； and (2) treating hair comprising contacting the hair with the above obtained pol
