| 主权项 |
1. 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
R1 is CH2—N(R4)—CH2—CH2—N(R5)(R6) in which R4, R5 and R6 are radicals, which may be identical or different, selected from alkyls having from 1 to 10 carbon atoms; or in which R4 and R5 are joined together and each represents a methylene group and R6 is an alkyl having from 1 to 10 carbon atoms, R2 and R3 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(SiMe3)2. |
