Patent ID: 8791228

Claim:
Process for bulk polymerization of lactide, at a temperature between 160° C. and 195° C., comprising bringing the lactide into contact with a metal catalyst of general formula (I) L-Zn—X (I) in which L is represented by formula (II) in which R 1 is CH 2 —N(R 4 )—CH 2 —CH 2 —N(R 5 )(R 6 ) in which R 4 , R 5 and R 6 are radicals, which may be identical or different, selected from alkyls having from 1 to 10 carbon atoms; or in which R 4 and R 5 are joined together and each represents a methylene group and R 6 is an alkyl having from 1 to 10 carbon atoms, R 2 and R 3 are radicals, which may be identical or different, selected from alkyls having from 1 to 10 carbon atoms, X is an alkyl having from 1 to 10 carbon atoms; or an alkoxide group OR′ in which R′ is an alkyl having from 1 to 10 carbon atoms; or the group N(SiMe 3 ) 2 .