Compositions and their applications

A polymer comprising

• (a) a core that bears one to 3 moieties of the general formula (I)
• wherein Z are different or the same and selected from the group consisting of C5-C20-alkylene wherein in said C5-C20-alkylene at least one C-atom is replaced by an N-atom that bears a polyalkylene chain and wherein the C-atoms in said C5-C20-alkylene may be non-substituted or substituted with one or more O—C1-C4-alkyl groups,
• A1 are different or the same and selected from the group consisting of C1-C12-alkylene, C6-arylene, and —CH2C(CO2X2)(OH)—CH2- and C3-C12-cycloalkylene, wherein C1-C12-alkylene and C3-C12-cycloalkylene may be non-substituted or substituted with one or more O—C1-C4-alkyl groups or OH groups, and wherein C3-C12-cycloalkylene may bear one to three methyl groups,
• or based on citric acid,
• X1 is selected from the group consisting of hydrogen, methyl, ethyl and combinations of at least two thereof,
• n is in a range of from 1 to 100,
• X2 is selected from the group consisting of C1-C4-alkyl, hydrogen, and CH(X1)—CH2—N—Z— and
• (b) polyalkylene oxide chains.