Patent ID: 6054404
Filing Date: 2000-04-25
Classification: C07F,C08F,Y10S

Abstract:
A catalyst for the polymerization of olefins comprising the product of the reaction between:(A) a metallocene compound of formula (I): ##STR9## wherein each R.sup.1, same or different, is a hydrogen atom, a C.sub.1 -C.sub.20 -alkyl radical, a C.sub.3 -C.sub.20 -cycloalkyl radical, a C.sub.2 -C.sub.20 -alkenyl radical, a C.sub.6 -C.sub.20 aryl radical, a C.sub.7 -C.sub.20 -alkylaryl radical, or a C.sub.7 -C.sub.20 arylalkyl radical, and further wherein two adjacent R.sup.1 substituents can form a cycle comprising from 5 to 8 carbon atoms, and furthermore the R.sup.1 substituents can contain silicon or germanium atoms;E is a bridging group selected from the group consisting of an SiR.sup.3.sub.2 group and a GeR.sup.3.sub.2 group, wherein each R.sup.3, same or different, is a C.sub.1 -C.sub.20 -alkyl radical, a C.sub.3 -C.sub.20 -cycloalkyl radical, a C.sub.2 -C.sub.20 -alkenyl radical, a C.sub.7 -C.sub.20 -alkylaryl radical, or a C.sub.7 -C.sub.20 arylalkyl radical, optionally containing heteroatoms, or the two R.sup.3 substituents can be joined to form a cycle comprising up to 8 atoms, at least four total carbon atoms being contained in the two R.sup.3 substituents;M is an atom of a transition metal selected from those belonging to Group 4 and 5 in the Periodic Table of the Elements (new IUversion);each Z substituent, same or different, is a halogen atom, an --OH, --SH, R.sup.4, --OR.sup.4, --SR.sup.4, --NR.sup.4.sub.2, or --PR.sup.4.sub.2 group, wherein R.sup.4 has the same definition as R.sup.1 ;wherein the metallocene of formula (I) is optionally present as the reaction of product of the metallocene of formula (I) with an aluminium organo-metallic compound of formula AIR.sup.5.sub.3 or Al.sub.2 R.sup.5.sub.6, wherein substituents R.sup.5, the same or different from each other, are defined as R.sup.1 or are halogen atoms; and(B) an alumoxane, optionally mixed with an aluminium organo-metallic compound of formula AIR.sup.5.sub.3 or Al.sub.2 R.sup.5.sub.6, wherein substituents R.sup.5, the same or different from each other, are as defined above, or one more compounds able to give a metallocene cation.