Catalytic systems for immortal ring-opening polymerisation of cyclic esters and cyclic carbonates

摘要

The present invention discloses new catalyst systems based on complexes of divalent metals supported by chelating phenoxy ligands for immortal ring-opening polymerisation of cyclic esters and cyclic carbonates.

主权项

1. A complex of a divalent metal of formula [LO]-M-X, wherein M is selected from Group 2 or 12 of the Periodic Table; wherein X is hydrocarbyl, or alkoxide group OR″ wherein R″ is hydrocarbyl, aryl, silyl, or amino group NR*2 wherein R* is SiMe3, iso-propyl, methyl or ethyl, and wherein [LO] is represented by formulawherein
R1 is  wherein m is 1, 2 or 3 and n≧1 R2 is hydrocarbyl group having 1 to 10 carbon atoms; R3 is the same as R1 or is hydrocarbyl group having 1 to 20 carbon atoms.