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A polyester of general formula (1) and its use as Association Thickener in aqueous media such as paints and inks; wherein R is hydrogen or a polymerisation terminating group; A is a residue of a poly-C2-6-alkyleneglycol containing not less than 80% by weight polyethyleneglycol such as polyethyleneglycol with number average MW from 200 to 35,000; B is the residue of C4-50-alk(en)yl succinic acid such as C14-alkylsuccinic acid; X is hydroxy, a group ROA-, a group -OR1, -NHR1 or -O-M+, R1 is C1-18-alk(en)yl; M+ is a metal cation, and n is from 2 to 100. Drawing : NIL Total Pages: 19 (FIG. - NIL)