Patent ID: 8624042

Claim:
A catalytic composition comprising: at least one organometallic titanium complex, and a hydrocarbylaluminium compound as activating agent, wherein said hydrocarbylaluminium compound is a tris(hydrocarbyl)aluminium compound, a chlorinated or brominated hydrocarbylaluminium compound, or an aluminoxane compound, and said organometallic complex contains at least one alkoxy ligand functionalized by a heteroatom that is nitrogen, oxygen, phosphorus, sulphur, arsenic or antimony or by an aromatic group and having the formula: [Ti(OR) n (Y) (4-n) ] in which: Y in each case is a halide, an R′O— alkoxy group, an R′ 2 N— amido group, or a R′COO— carboxylate, where R′ is a hydrocarbonyl radical, optionally non-functionalized, containing 1 to 30 carbon atoms; n is whole values from 1 to 4; and —OR is an alkoxy ligand the structure of which is below: O—(CR 10 R 11 ) m —X-L in which: the functional group L is a group comprising a heteroatom that is arsenic or antimony, or an aromatic group, or L is —NR 1 R 2 , —OR 3 , —PR 4 R 5 or —SR 6 , wherein R 1 and R 2 together are a cyclic hydrocarbon containing 1 to 30 carbon atoms; wherein R 3 , R 4 , R 5 , R 6 each represent a hydrogen atom or a hydrocarbon chain, which is acyclic or cyclic, containing 1 to 30 carbon atoms, the group X represents —CR 7 R 8 —, —O— or —NR 9 —; the groups R 7 , R 8 , and R 9 each represent a hydrogen atom or a hydrocarbon chain, which is acyclic or cyclic, containing 1 to 30 carbon atoms, and optionally comprising a heteroatom; and the group (CR 10 R 11 ) m is —CH 2 —, —(CH 2 ) 2 —, —(CH 2 ) 3 —, —(CH 2 ) 4 —, —(CH 2 ) 5 —, —C(CH 3 ) 2 —, —C(CH 3 ) 2 —CH 2 —, —C(CH 3 ) 2 —CH 2 —CH 2 —, —C(CF 3 ) 2 —, —C(CF 3 ) 2 —CH 2 — or —C(CF 3 ) 2 —CH 2 —CH 2 —.