Patent ID: 6143845
Filing Date: 2000-11-07
Classification: C08F,Y10S

Abstract:
A process for producing a polyolefin which comprises polymerizing an olefin in the presence of 10.sup.-8 to 10.sup.-2 mole in terms of the atoms M.sup.2 per liter of polymerization solvent of a catalyst consisting essentially of:(A) a transition metal compound having a group with conjugated .pi. electrons as a ligand, said transition metal compound having the formula (III), (IV) or (V)CpM.sup.2 R.sup.5.sub.e R.sup.6.sub.f R.sup.7.sub.g (III)Cp.sub.2 M.sup.2 R.sup.5.sub.e R.sup.6.sub.f (IV)(Cp--A.sub.h --Cp)M.sup.2 R.sup.5.sub.e R.sup.6.sub.r (V)wherein M.sup.2 is a transition metal belonging to the group IVB of the Periodic Table of Elements,Cp is an unsaturated cyclic hydrocarbon radical or an unsaturated chain hydrocarbon radical,R.sup.5, R.sup.6 and R.sup.7, independently, are each a .sigma.-bonding ligand selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryl group, an alkylaryl group, an arylalkyl group each having 6 to 20 carbon atoms, an acyloxy group having 1 to 20 carbon atoms and an allyl group, a acetylacetonato chelating ligand or Lewis base selected from the group consisting of ethers, thioethers, esters, nitrites, amines, phosphine, unsaturated chain hydrocarbons and unsaturated cyclic hydrocarbons,A is a group covalently bonding the Cp groups,e, f and g, independently, are an integer of from 0 to 4, and h is an integer from 0 to 6, wherein two of R.sup.5, R.sup.6 and R.sup.7 may together form a ring:(B) an aluminoxane having formula (VII), ##STR4## wherein R.sup.10 is a hydrocarbon radical having 1 to 8 carbon atoms and r is an integer from 2 to 100, or having formula (VIII) ##STR5## wherein R.sup.11, R.sup.12 and R.sup.13, independently of one another, are each a hydrocarbon radical having 1-8 carbon atoms and s is an integer from 2 to 100; and(C) a magnesium compound represented by the formulaMg(OR).sub.n X.sup.1.sub.2-nwherein R is an alkyl group, a cycloalkyl group, an aryl group or an aralkyl group, X.sup.1 is a halogen atom, and n is a number from 1 to 2,wherein the amount of catalyst component (A) is 10.sup.-4 to 10.sup.-1 mole per mole of catalyst component (C) andwherein said magnesium compound is prepared by reacting an alcohol having 1-6 carbon atoms, metallic magnesium, and a halogen selected from the group consisting of chlorine, bromine and iodine, wherein said magnesium compound is prepared by mixing 2-100 moles of said alcohol per mole of said magnesium at least 0.0001 g-atom of said halogen per mole of said magnesium, and heating the resulting mixture until the generation of hydrogen gas is no longer observed.