Bimetal catalyst for the (co)polymerization of .alpha.-olefins

C - Chemistry – Metallurgy – 08 – F

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C08F 4/658 (2006.01) C08F 10/00 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2367762

Bimetal catalyst for the (co)polymerization of .alpha.-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.

La présente invention a pour objet un catalyseur bimétallique destiné à la (co)polymérisation d'.alpha.-oléfines, comprenant un co-catalyseur constitué d'un hydrure ou d'un composé organométallique d'un élément des groupes 1, 2 ou 13 du tableau périodique et un composant solide constitué d'au moins 95 % en poids de titane, de magnésium, de hafnium, d'aluminium, de chlore et de groupes carboxylates R-COO, dans lesquels R représente un hydrocarbure aliphatique, cycloaliphatique ou aromatique contenant de 1 à 30 atomes de carbone. Au moins 80 % du titane est dans un état d'oxydation +3 et au moins 1 % dudit titane dans un état d'oxydation +3 présente une configuration géométrique de coordination tétraédrique. Ledit catalyseur permet de produire des polymères oléfiniques, notamment du polyéthylène, ayant un poids moléculaire élevé, au moyen de procédés de polymérisation en solution à des températures supérieures à 200 degré .C.

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