Uncharged clay blocking agent

A construction material composition comprising

• A) at least one non-ionic copolymer, wherein the copolymer is uncharged at a pH range of 5 to 9, comprising residues based on the following monomer components:
• i) monomer Component A, comprising an ethylenically unsaturated monomer comprising at least one alkyl amide moiety or at least one nitrogen-containing heterocyclic moiety, and
• ii) monomer Component B, comprising an ethylenically unsaturated monomer comprising at least one polyether moiety, wherein the at least one polyether moiety in monomer Component B comprises the structural unit (a)
• *—U—(C(O))k—X-(AlkO)n—W (a)
• wherein
• * denotes the binding site to the polymer,
• U is a chemical bond or a C2-C8-alkylene,
• X is O, N, or NR1,
• k is 0 or 1,
• n is an integer having a mean value of between 24 to 300, based on the whole non-ionic copolymer,
• Alk is C2-C4-alkylene, wherein Alk may be same or different within the group of (AlkO)n,
• W is H, C1-C6-alkyl, aryl, or Y—F,
• Y is a linear or branched C2-C8-alkylene, which may further be substituted with a phenyl,
• F is a 5 to 10-membered nitrogen heterocycle, which is attached via a nitrogen to Y, wherein besides the nitrogen atom and carbon atoms 1, 2, or 3 additional heteroatoms selected from the group consisting of oxygen, nitrogen, and sulfur may be present as ring members and wherein the nitrogen ring members may be bond to a moiety R2, and wherein 1 or 2 carbon ring members may be present as carbonyl,
• R1 is H, C1-C4-alkyl, or benzyl, and
• R2 is H, C1-C4-alkyl, or benzyl,
• with the proviso that k is 0 if U is a chemical bond;
• and
• B) at least one inorganic binder selected from a hydraulic binder or a latent hydraulic binder.

A method comprising providing a non-ionic copolymer, wherein the copolymer is uncharged at a pH range of 5 to 9,

• comprising residues based on the following monomer components:
• i) monomer Component A, comprising an ethylenically unsaturated monomer comprising at least one alkyl amide moiety or at least one nitrogen-containing heterocyclic moiety;
• ii) monomer Component B, comprising an ethylenically unsaturated monomer comprising at least one polyether moiety comprising the structural unit (a)
• *—U—(C(O))k-X-(AlkO)n-W (a)
• wherein
• * denotes the binding site to the polymer,
• U is a chemical bond or a C1-C8-alkylene,
• X is O, N, or NR1,
• k is o or 1,
• n is an integer having a mean value of between 3 to 300, based on the whole non-ionic copolymer,
• Alk is C2-C4-alkylene, wherein Alk may be same or different within the group of (AlkO) n,
• W is H, C1-C6-alkyl, aryl, or Y—F,
• Y is a linear or branched C2-C8-alkylene, which may further be substituted with a phenyl,
• F is a 5 to 10-membered nitrogen heterocycle, which is attached via a nitrogen to Y, wherein besides the nitrogen atom and carbon atoms 1, 2, or 3 additional heteroatoms selected from the group consisting of oxygen, nitrogen, and sulfur may be present as ring members and wherein the nitrogen ring members may be bond to a moiety R2, and wherein 1 or 2 carbon ring members may be present as carbonyl,
• R1 is H, C1-C4-alkyl, or benzyl, and
• R2 is H, C1-C4-alkyl, or benzyl;
• and
• at least one inorganic binder selected from a hydraulic binder or a latent hydraulic binder or at least one inorganic binder based on calcium sulfate, and
• iii) optionally monomer Component C, having the formula (1) wherein
• RA is H, OH, (C1-C3-alkylene)-OH, or C1-C3-alky;
• RB is H, OH, (C1-C3-alkylene)-OH, or C1-C3-alky;
• RC is H, OH, (C1-C3-alkylene)-OH, or C1-C3-alky;
• and
• n is an integer from o to 10,
• preparing a construction material composition,
• and modifying robustness against clay deviations, without retarding the set time of the construction material composition.