the present invention describes a polyoxaester copolymer and blends thereof that may be used to produce hydrogels , surgical devices such as sutures , sutures with attached needles , molded devices , drug matrices , adhesives , sealants and the like . the invention also contemplates a process for producing these polyesters . the polyoxaester copolymers of the present invention are formed from a first divalent repeating unit of formula ia : — r 30 — c —] ia a second divalent repeating unit of the formula ib : — c — o — r 3 — o — c — c —] ib and a third repeating unit selected from the group of formulas consisting of : a , ii —] b , iii ] p — o —) l g xi and combinations thereof . these aliphatic polyoxaesters may be blended with other polymers that are preferably biocompatable .