| abstract |
Bimetal catalyst for the (co)polymerization of α-olefins comprising a co-catalyst consisting of a hydride or an organometallic compound of an element of groups 1, 2 or 13 of the periodic table, and a solid component consisting of at least 95 % by weight of titanium, magnesium, hafnium, aluminum, chlorine and R-COO carboxylate groups, wherein R is an aliphatic, cycloaliphatic or aromatic hydrocarbon, containing from 1 to 30 carbon atoms, wherein at least 80 % of the titanium is in oxidation state +3, and at least 1 % of said titanium in oxidation state +3 has a tetrahedral coordination geometry. Said catalyst allows the production of olefinic polymers, particularly polyethylene, with a high molecular weight by means of solution polymerization processes at temperatures exceeding 200 °C. |