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AssigneeBP Chemicals Limited
InventorsHenri Cramail, Alain Deffieux, Cedric Dever, Sergio Mastroianni
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A process for the preparation of a silicon containing transition metal compound comprises the steps of (a) non-hydrolytic sol-gel condensation of a silane of formula LxSiQn wherein L is a π-bonded ligand, Q is an anionic ligand, and x+n=4 with a halogenated silane (or siloxane) and an alkoxysilane, (b) optionally alkylation, (c) deprotonation and (d) addition of a transition metal compound. The novel process allows for the preparation of transition metal compounds which may suitably be used with cocatalysts for the polymerisation of olefins, in particular for such processes carried out in the gas phase.
A process for the preparation of a silicon containing transition metal compound, said process comprising the steps of
A process for the preparation of a silicon containing transition metal compound, said process comprising the steps of
A polymerisation catalyst system comprising (a) a silicon containing transition metal compound prepared according to any of the preceding claims and (b) a cocatalyst.
A process for the polymerisation of olefin monomers selected from (a) ethylene, (b) propylene (c) mixtures of ethylene and propylene and (d) mixtures of (a), (b) or (c) with one or more other alpha-olefins, said process performed in the presence of a silicon containing transition metal compound prepared according to any of the preceding claims and (b) a cocatalyst.
A process for the polymerisation of ethylene or the copolymerisation of ethylene and α-olefins having from 3 to 10 carbon atoms, said process carried out in the presence of a (a) a silicon containing transition metal compound prepared according to any of the preceding claims and (b) a cocatalyst.
Dependencies are inferred from the claim text.