| abstract |
A catalyst for polymerising 1-olefins, comprising (a) a tetradentate ligand I and II as illustrated in the specification wherein; D and D′ are phosphorus or nitrogen; Q and Q are bridging groups forming part of a ring; B is a bridging group between D and D′; R 1 and R 9 are each independently a polar group or phenyl, naphthyl, anthryl, phenanthryl, triptycyl or a heteroaromatic ring; R 5 to R 8 are selected from hydrogen, halogen, hydrocarbyl, heterohydrocarbyl, NR′ 2 , PR′ 2 , OR′, SR′ or SiR′ 3 where each R′ is independently selected from hydrogen, halogen, hydrocarbyl, heterohydrocarbyl, and any adjacent groups may be joined together to form a ring; in the case I, A and A′ are independently OH, 0 − , SH, S − , NR″H, R″N − , PR″H or R″P − ; and in the case II A and A′ are independently NH, N − , PH or P − , where R″ is defined as for groups R 5 to R 9 above; and R 5 and R 5′ , R 6 and R 6′ , or R 7 and R 8 may be joined together to form a ring; (b) a source of Group 3 to 10 transition metal or a lanthanide metal and optionally (c) an activator. Also claimed are transition metal complexes of the ligands and a process for (co)polymerising 1-olefins. |