Patent ID: 7015302

Claim:
A thermoplastic or crosslinked copolymer having, in polymerized form, units derived from a (a) monocydic ester or corresponding hydroxy acid or (b) a monocycic carbonate, or both (a) and (b), and units derived from a bicylic diester and/or carbonate having the structure wherein each R is independently lower (C 1-4 ) alkyl or hydrogen, each Z is —O— or a covalent bond, each n and each o are independently zero or a positive integer, provided that the values of n and o, taken together, are such that the main ring contains 6 or 7 members when each Z is a covalent bond and 8 or 9 members when each Z is —O—, and Y is —(CR 2 ) m — where m is 1, 2 or 3, wherein the copolymer contains from about 0.05 to about 1.5 weight percent, based on the total weight of the copolymer, of units derived from a bicyclic diester and/or carbonate.