Patent ID: 6831034
Filing Date: 2004-12-14
Classification: C08F,Y10S

Abstract:
A catalytic composition for the (co)polymerization of ethylene and other &agr;-olefins, comprising the following two components in contact with each other, or the product of their reaction:(i) a metallocene complex of a metal M of group 4 of the periodic table, including at least one &eegr;5-cyclopentadienyl group and at least one unsaturated hydrocarbyl group Râ€², bonded to the metal M; (ii) an ionizing activator which is at least one organic or organometallic compound capable of reacting with said metallocene complex (i) so as to form a positive ionic charge thereon by the extraction of an anion of an unsaturated hydrocarbylic organic group and formation of a non-coordinating anion with a delocalized ionic charge; wherein said unsaturated hydrocarbyl group Râ€² has the following formula (I): -(AxDyUz)RIâ€ƒâ€ƒ(I) wherein:A represents any monomeric unit derived from a vinylaromatic group polymerizable by means of anionic polymerization, having from 6 to 20 carbon atoms; D represents any monomeric unit derived from a conjugated diolefin polymerizable by means of anionic polymerization, having from 4 to 20 carbon atoms; U represents any generic monomeric unit derived from an unsaturated compound co-polymerizable with any of the above conjugated diolefins D or vinylaromatic compounds A; RI represents hydrogen or a hydrocarbyl group having from 1 to 20 carbon atoms; the index â€œxâ€  can be zero or an integer; the index â€œyâ€  is an integer higher than zero; the index â€œzâ€  can be zero or an integer ranging from 1 to 20; and the sum (x+y) is equal to or higher than 2.