RING OPENING POLYMERISATION OF LACTONES AND LACTIDES USING YTTRIUM AND/OR RARE EARTH METAL COMPOUNDS AS CATALYSTS; CATALYSTS, FILMS AND COATED ARTICLES

摘要

Process for yttrium and rare earth compound catalyzed polymerization of lactones and the living polymer compositions of such polymerizations, novel polyester products of such polymerizations and novel yttrium and rare earth metal compounds useful as catalysts in the polymerization of biodegradable polymers for medical uses and flexible films for packaging.