A composition with improved adhesive and sealant properties comprising a pre-polymer comprising a polymeric unit of the general formula (1A1B-)n, wherein A represents a substituted or un-substituted ester, B represents a substituted or un-substituted acid ester comprising at least two acid ester functionalities, and n represents an integer greater than 1, wherein the compositions has a grafted anhydride content of less than about 0.05 mol/mol of polyacid.