| http://www.w3.org/ns/prov#value | - The process according to claim 1, wherein the at least one alkylaluminum compound comprises a compound having the general formula: AlRaXb, wherein R is an alkyl radical, X is a halogen radical, a is an integer from 1 to 3, b is 0, 1 or 2, and the sum (a+b) is 3.
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