Abstract
An aliphatic polyester and/or copolyester, obtained from a polyreaction of at least one monomer from the group comprising lactides, lactones, cyclic carbonates and cyclic anhydrides. To be able to prepare the aliphatic polyester and/or copolyester a reaction mixture is used which contains at least one catalyst of the general formula (M) (X1, X2 . . . X), M being a metal selected from the group 3 to 12 of the periodic system (X1, X2 . . . Xm) being a substituent selected from one of the families of alkyls, aryls, oxides, carboxylates, halogenides, alkoxides and compounds with elements from group 15 and/or 16 of the periodic system, m being an integer in the range of from 1 to 6, and n being an integer in the range of from 0 to 6, and which also contains a co-catalyst of the general formula (Y) (R1, R2 . . . Rq)p, Y being an element selected from the group 15 or 16 of the periodic system. (R1, R2 . . . Rq) being a substituent selected from one of the families of the alkyls, aryls, oxides, halogenides, oxyalkyls, aminoalkyls, thiolkyls, phenoxides, aminioaryls, thioaryls, and q and p corresponding to the values for m and n.
Original language | English |
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Patent number | US6166169 |
IPC | C08G 63/ 78 A N |
Priority date | 11/07/97 |
Publication status | Published - 26 Dec 2000 |
Externally published | Yes |