| 摘要 |
The invention concerns a process for manufacturing low density linear polyethylene by copolymerizing ethylene and 1-butene, comprising the steps of: (a) dimerizing ethylene to 1-butene in the presence of a soluble catalyst comprising: an alkyl titanate, an aluminum compound of formula AlR3 or AlR2H, wherein R is a hydrocarbyl radical, and an ether; (b) contacting at least a portion of the product obtained in step (a) with an inorganic compound, at least partly insoluble; (c) contacting the insoluble mixture obtained in step (b) with an halogenated aluminum compound of formula Al2R'6-nXn, wherein R' is a hydrocarbyl radical, X a halogen atom, and n a number from 3 to 6, when an halogenated aluminum compound is not already present in said mixture; (d) using the resultant product, containing at least one inorganic carrier, at least one halogenated aluminum compound and at least one titanium compound, as catalyst in the polymerization reactor.
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