| abstract |
The invention provides a compound suitable for use as a catalyst for ring opening polymerisation reactions for examiile for the polymerisation of lactonss, lactides etc, the catalyst comprising the reaction pi oduct of (I) an alkoxide, halide, condensed alkoxide, amide, condensed amide, mixed halo-alkoxide or, mixed halo-amide, sulphonic acid derivative, sulphonamide, silanot or silylamide of titanium zirconium, hafnium or aluninium or a mixture thereof, and (ii) a complexing compound selected from the list comprising oximes, hydroxy-Schiff bases. 8-hydroxyquinoline derivatives, 10-hydroxybenzo-[h]-quinoline derivatives. Hydrazones and substituted phenols. |