A comb polymer KP comprising or consisting of: a mole fractions of a partial structural unit S1 of formula I b mole fractions of a partial structural unit S2 of formula II c mole fractions of a partial structural unit S3 of formula III wherein each M independently of one another represents H +, an alkali metal ion, an alkaline earth metal ion, an equivalent of a divalent or trivalent metal ion, an ammonium ion or an organic ammonium group, each R u independently of one another represents hydrogen or a methyl group, each R v independently of one another represents hydrogen or COOM, each R 1 independently of one another represents a C 1 - to C 20 -alkyl,-Cycloalkyl, -alkylaryl or - n -R 2, wherein A = C 2 - to C 4 -alkylene, R 2 = C 1 - to C 20 -alkyl, -cyclohexyl or alkylaryl; and n = 2 - 300, each R 3, independently of one another, represents a C 1 - to C 5 -alkyl group, preferably a methyl, ethyl or Isopropyl group, each R 4, independently of one another, represents hydrogen,a C 1 - to C 5 -alkyl group, preferably hydrogen, each R 5, independently of one another, represents an alkyl group with 1 - 20 carbon atoms or an alkylaryl group with 7 - 20 carbon atoms, each Z, independently of one another, represents oxygen or N-R 6, wherein R 6 represents hydrogen, an alkyl group with 1 - 20 carbon atoms or an alkylaryl group with 7 - 20 carbon atoms, x has the values of 1 - 4, y has the values of 2 - 250, w has the values of 0 - 5, and wherein a, b, and c represent the mole fractions of the respective partial structural units S1, S2 and S3, with the molar ratio a / b / c = 0.1 − 0.9 / 0 − 0.4 / 0.1 − 0.9, especially a/b/c = (0.4 - 0.8) / (0 - 0.25) / (0.1 - 0.4), particularly a/b/c = (0.4 - 0.8) / (0.05 - 0.25) / (0.1 - 0.4), and the proviso that a + b + c = 1. a mole fractions of a partial structural unit S1 of formula I b mole fractions of a partial structural unit S2 of formula II c mole fractions of a partial structural unit S3 of formula III wherein each M independently of one another represents H +, an alkali metal ion, an alkaline earth metal ion, an equivalent of a divalent or trivalent metal ion, an ammonium ion or an organic ammonium group, each R u independently of one another represents hydrogen or a methyl group, each R v independently of one another represents hydrogen or COOM, each R 1 independently of one another represents a C 1 - to C 20 -alkyl,-Cycloalkyl, -alkylaryl or - n -R 2, wherein A = C 2 - to C 4 -alkylene, R 2 = C 1 - to C 20 -alkyl, -cyclohexyl or alkylaryl; and n = 2 - 300, each M independently of one another represents H +, an alkali metal ion, an alkaline earth metal ion, an equivalent of a divalent or trivalent metal ion, an ammonium ion or an organic ammonium group, each R u independently of one another represents hydrogen or a methyl group, each R v independently of one another represents hydrogen or COOM, each R 1 independently of one another represents a C 1 - to C 20 -alkyl,-Cycloalkyl, -alkylaryl or - n -R 2, wherein A = C 2 - to C 4 -alkylene, R 2 = C 1 - to C 20 -alkyl, -cyclohexyl or alkylaryl; and n = 2 - 300, each R 3, independently of one another, represents a C 1 - to C 5 -alkyl group, preferably a methyl, ethyl or Isopropyl group, each R 4, independently of one another, represents hydrogen,a C 1 - to C 5 -alkyl group, preferably hydrogen, each R 5, independently of one another, represents an alkyl group with 1 - 20 carbon atoms or an alkylaryl group with 7 - 20 carbon atoms, each Z, independently of one another, represents oxygen or N-R 6, wherein R 6 represents hydrogen, an alkyl group with 1 - 20 carbon atoms or an alkylaryl group with 7 - 20 carbon atoms, x has the values of 1 - 4, y has the values of 2 - 250, w has the values of 0 - 5, and wherein a, b, and c represent the mole fractions of the respective partial structural units S1, S2 and S3, with the molar ratio a / b / c = 0.1 − 0.9 / 0 − 0.4 / 0.1 − 0.9, especially a/b/c = (0.4 - 0.8) / (0 - 0.25) / (0.1 - 0.4), particularly a/b/c = (0.4 - 0.8) / (0.05 - 0.25) / (0.1 - 0.4), and the proviso that a + b + c = 1.