Abstract: Permethylpentalene based metallocene complexes are disclosed. The complexes are effective catalysts/initiators in the polymerisation of olefins. Also disclosed are compositions comprising the metallocene complexes, as well as uses of the complexes and compositions in olefin polymerisation.

Abstract: A use of ansa-metallocene complexes for the polymerisation of cyclic esters and cyclic amides is disclosed. The ansa-metallocene complexes are particularly active as initiators/catalysts in the polymerisation of lactides, with the resulting polymeric material demonstrating low polydispersity.

Abstract: The present invention relates to a compound having the formula LaM(OR1)bR2cXd wherein M is a metal selected from Ti, Zr and Hf; L is a ligand selected from permethylpentalene, (hydro)permethyl-pentalene, (hydro)pentalene, cyclopentadiene, indene and ethylene- or silane-bridged indene, preferably (bis)indene; R1 is a 1-6C alkyl, substituted or unsubstituted phenyl, or a substituted or unsubstituted phenylalkylene group; R2 is Me or Et; X is halogen; a=1 to 3, b=1 to 3, c=0 or 1 and d=0, 1, 2 or 3; and dimers thereof, the use of the compound as an initiator in the polymerization of lactide monomer and a process for producing a polylactide performed by contacting a lactide monomer with the compound.

Abstract: The present invention relates to a process for the oligomerisation of ethylene which comprises contacting ethylene with a transition metal-permethylpentalene complex, and a transition metal compound utilized therein.

Abstract: Novel Si-bridged metallocene catalysts of formula I defined herein are disclosed, as well as their use in olefin polymerisation reactions.

Abstract: The present invention relates to a synergistic dual olefin copolymerization catalyst system comprising a solid support material having, on its surface, two or more catalytic metal complexes wherein the two or more catalytic metal complexes comprise at least one first transition metal complex and a second transition metal complex different from the first transition metal complex; use of such a system as a catalyst; a process for producing a polymer of an olefin utilizing the catalyst system.

Abstract: A catalyst system is provided which comprises a solid support material having, on its surface, one or more catalytic transition metal complex wherein the solid support material comprises SiO2@AMO-LDH microspheres having the formula I: (i) wherein, Mz+ and M?y+ are two different charged metal cations; z=1 or 2; y=3 or 4; 0<x<0.9; b is 0 to 10; c is 0.01 to 10, preferably >0.01 and <10; p>0 q>0; Xn? is an anion with n>0, preferably 1?5a=z(1?x)+xy?2; and the AMO-solvent is an 100% aqueous miscible organic solvent. Preferably, M? in the formula I is Al. Preferably, M in the formula I is Li, Mg or Ca. The catalyst system has use in the polymerisation and/or copolymerisation of at least one olefm to produce a homopolymer and/or copolymer.

Abstract: Novel catalytic compositions are disclosed comprising symmetrical metallocene catalytic compounds. Also disclosed are uses of such catalytic compositions in olefin polymerisation reactions, as well as processes for polymerising olefins. When compared with prior art compositions, the catalytic compositions of the invention are markedly more active in the polymerisation of olefins.

Abstract: Novel catalytic compositions are disclosed comprising novel unsymmetrical metallocene catalytic compounds. Also disclosed are uses of such catalytic compositions in olefin polymerisation reactions, as well as processes of polymerising olefins. When compared with the prior art compositions, the catalytic compositions of the invention are markedly more active in the polymerisation of olefins.

Abstract: Novel unsymmetrical metallocene catalytic compounds of formula (I) are disclosed, as well as catalytic compositions comprising compounds of formula (I). Also disclosed are uses of such catalytic compounds and compositions in olefin polymerisation.

Abstract: The present invention relates to a new process for the synthesis of 2,3,4,5,6,7-substituted indenes, which are useful precursors for the formation of certain ansa-metallocene catalysts.

Abstract: The present invention relates to a process for the oligomerisation of ethylene which comprises contacting ethylene with a transition metal-permethylpentalene complex, and a transition metal compound utilized therein.

Abstract: The present invention relates to a synergistic dual olefin copolymerization catalyst system comprising a solid support material having, on its surface, two or more catalytic metal complexes wherein the two or more catalytic metal complexes comprise at least one first transition metal complex and a second transition metal complex different from the first transition metal complex; use of such a system as a catalyst; a process for producing a polymer of an olefin utilizing the catalyst system.

Abstract: Novel Si-bridged metallocene catalysts of formula I defined herein are disclosed, as well as their use in olefin polymerisation reactions.

Abstract: The present invention relates to a compound having the formula LaM(OR1)bR2cXd wherein M is a metal selected from Ti, Zr and Hf; L is a ligand selected from permethylpentalene, (hydro)permethyl-pentalene, (hydro)pentalene, cyclopentadiene, indene and ethylene- or silane-bridged indene, preferably (bis)indene; R1 is a 1-6C alkyl, substituted or unsubstituted phenyl, or a substituted or unsubstituted phenylalkylene group; R2 is Me or Et; X is halogen; a=1 to 3, b=1 to 3, c=0 or 1 and d=0, 1, 2 or 3; and dimers thereof, the use of the compound as an initiator in the polymerisation of lactide monomer and a process for producing a polylactide performed by contacting a lactide monomer with the compound.