Patent ID: 6228952
Filing Date: 2001-05-08
Classification: B01J,C08C,C08F

Abstract:
A catalytic composition prepared by reaction between:(A) at least one cyclopentadienyl complex of a transition metal having general formula (I):(R)(R.sup.1)M.sub.1 (R.sup.2)(R.sup.3)wherein:R is an anion containing an .eta..sup.5 -cyclopentadienyl ring coordinated to M.sub.1 ;M.sub.1 is selected from titanium, zirconium and hafnium;R.sup.2 and R.sup.3, the same or different, are organic or inorganic anionic groups bound to M.sub.1 ;R.sup.1 is selected from cyclopentadienyl and R.sup.2 ;with(B) an alkylating composition consisting essentially of:(b1) an organometallic compound having general formula (II):M.sub.2 (R.sup.4)(R.sup.5), wherein M.sub.2 is selected from Zn and Mg, R.sup.4 is selected from aliphatic or aromatic hydrocarbon radicals having from 1 to 20 carbon atoms; R.sup.5 is a halogen or is equal to R.sup.4 ; and(b2) an organoderivative of aluminum having general formula (III): Al(R.sup.6).sub.3, wherein R.sup.6 is a C.sub.1 -C.sub.16 aliphatic hydrocarbon radical, and wherein the molar ratio of (I) to (b1) is from 1/1 to 1/10: and the molar ratio of (b2) to (I) is less than 1.