Gypsum-containing composition

A composition comprising

• A) at least one binder based on calcium sulfate and
• B) at least one polymer obtainable by polymerization of monomers comprising an unsaturated compound of the general formula (I)
• where
• R1, R2, R3 are identical or different and are each, independently of one another, H, or CH3,
• R4 is linear or branched C1-C30-alkylene,
• R5, R6 are identical or different and are each, independently of one another, H, C1-C20-alkyl, C3-C15-cycloalkyl, aryl, —CH2—O—C1-C20-alkyl, or CH2—O—C2-C20-alkenyl, where R5 and R6 can together also form a C3-C6-alkylene,
• R7 is H, C1-C4-alkyl, or
• R8 is C1-C22-alkyl, or C2-C22-alkenyl, and
• n is an integer from 2 to 200.