FIELD: chemistry.
SUBSTANCE: invention relates to use of a polymer P containing at least one acid link, at least one ester link and at least one amide link, and the ratio of acid links to ester and amide links is equal to 2-6, as a dispersant, especially as a plasticiser, for gypsum compositions, as well as a binder containing said polymer P and a method of preparing the binder, wherein the polymer P is added separately or premixed as an additive in solid or liquid form to the binder. The invention is developed in subclaims.
EFFECT: high fluidity, low shrinkage and low swelling capacity.
23 cl, 6 tbl
