| abstract |
In an ethylene copolymer with alpha-olefins, obtainable by polymerization in the presence of catalysts comprising the following reactants 1), 2), which can be used as additives to improve the properties of the intermediate effluent at low temperatures:n n n The reactant 1) is as followsn n n (Cp 1 Cp 2 ) -M- (L 2 L 3 )n n n Bis-cyclopentadienyl, which has a general formula and includes a group having an oxygen bound to a transition metal, wherein M is IIb in the lanthanides group IIIb group of the periodic table. Metal up to the group; Reactant 2) is a cocatalyst selected from the compounds represented by 2a) and 2b):n n n Reactant 2) is a copolymer selected from alumoxane or boron. |