A polymer comprising recurring units represented by formula (I): wherein X is selected from the group consisting of C(O)OR1, C(O)SR1, C(O)NR1R2, and VZ, where R1 and R2 are each individually selected from the group consisting of hydrogen, C1 to C10 alkyl, and C6 to C10 aryl, where...http://www.google.com/patents/US6878374?utm_source=gb-gplus-sharePatent US6878374 - Biodegradable polyacetals
