Inorganic binder composition comprising a copolymer

A composition comprising

• (α) at least one inorganic binder
• (β) at least one water-soluble copolymer based on
• (a) 0.1 to 20 wt % of at least one monomer of the formula (I),
• H2C═C(R1)—R2—O—(—CH2—CH2—O—)k—(—CH2—CH(R3)—O—)l—(—CH2—CH2—O—)m—R4 (I)
• where the units —(—CH2—CH2—O—)k, —(—CH2—CH(R3)—O—)l and —(—CH2—CH2—O—)m are arranged in a block structure in the order shown in formula (I)
• and the radicals have the following meanings:
• k:
• is from 10 to 150;
• l :
• is from 5 to 25;
• m:
• is from 1 to 15;
• R1:
• is H or methyl;
• the radicals R2:
• are each, independently of one another, a single bond or a divalent, linking group selected from the group consisting of —(CnH2n)— and —O—(Cn′H2n′)— and —C(O)—O—(Cn″H2n″)—, where n, n′ and n″ are each a natural number from 1 to 6;
• R3:
• is a hydrocarbon radical having at least 2 carbon atoms or an ether group of the general formula —CH2—O—R3′, where R3′ is a hydrocarbon radical having at least 2 carbon atoms and the radicals R3 can be identical or different within the group —(—CH2—CH(R3)—O—)l;
• the radicals R4:
• are each, independently of one another, H or a hydrocarbon radical having 1 to 4 carbon atoms, and
• (b) 25 to 99.9 wt % by weight of at least one monoethylenically unsaturated, hydrophilic monomer (b) different from monomer (a),
• where the wt % figures are in each case based on the total amount of all monomers in the copolymer and the at least one copolymer has a molar mass average M of 1 500 000 to 30 000 000 g/mol which is determined by the Mark-Houwink relationship (1)
• M=([η]/K)1/α (1),
• where K=0.0049, α=0.8 and [η] is the intrinsic viscosity.