Abstract: A complex of transition metal Ti, Fe, Co, Ni, Cr, Mn, Ta, Rh, Y, Sc, Ru, Pd, Zr, Hf, V or Nb and a mono-, bi-, tri-, or tetra-dentate ligand, wherein at least one of the donor atoms of the ligand is a nitrogen atom N with a 5-membered heterocyclic substituent joined to the N by a carbon atom. The complex is preferably Formula (I) wherein R5—N-G-X1 is a bi-, tri, or tetra-dentate ligand, N is joined to G by an imine linkage; G is a bridging group which can contain a third or fourth donor atom: X1 is —O or —S if the X1-M bond is covalent, or if the X1-M bond is dative X1 is ?S, —PR7R8, —PR8R9, ?NR7, ?NR8, —NR7R8 or —NR8R9; R5 and R7 are 5-membered heterocyclic substituents joined to the nitrogen (or phosphorus) atoms via a carbon atom: R8 and R9 are hydrocarbyl or heterohydrocarbyl, substituted hydrocarbyl or aryl substituent; X represents an atom or group covalently or ionically bonded to the transition metal M: L is a group datively bound to M, and n is from 0 to 5; q is 1 or 2.

Abstract: A catalyst for the polymerisation of 1-olefins is disclosed, which comprises (1) a compound of Fotmula B wherein M is Fe[II], Fe[III], Co[I], Co[II], Co[III], Mn[I], Mn[II], Mn[III], Mn[IV], Ru[II], Ru[III] or Ru[IV]; X represents an atom or group covalently or ionically bonded to the transition metal M; T is the oxidation state of the transition metal M and b is the valency of the atom or group X; R1, R2, R3, R4, R5, R6 and R7 are independently selected from hydrogen, halogen, hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl or substituted heterohydrocarbyl; and when any two or more of R1-R7 are hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl or substituted heterohydrocarbyl, said two or more can be linked to form one or more cyclic substituents; and (2) a further catalyst. Copolymers made using the catalyst having specific physical properties arm also disclosed.

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?; R1 and R9 are each independently a polar group or phenyl, naphthyl, anthryl, phenanthryl, triptycyl or a heteroaromatic ring; R5 to R8 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 R5 to R9 above; and R5 and R5?, R6 and R6?, or R7 and R8 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 act