up, and G is a derivatizable group such as an unsaturated functionality or ester subs...http://www.google.com/patents/US6730772?utm_source=gb-gplus-sharePatent US6730772 - Degradable polymers from derivatized ring-opened epoxidesAdvanced Patent SearchPublication numberUS6730772 B2Publication typeGrantApplication numberUS 09/886,394Publication dateMay 4, 2004Filing dateJun 22, 2001Priority dateJun