Preparation of lactic acid homo- and copolymers by ring opening polymerization of their cyclic monomers useful for synthetic packaging materials, hygiene products surgical implantation, and parenteral medicinal materials

摘要

A process for preparation of lactic acid homo- and copolymers by ring opening polymerization of their cyclic monomers in a liquid/melt phase in the presence of an initiator containing a tin compound and at least one other initiator selected from metal compounds of the fourth sub-group is new.