Patent ID: 6177529
Filing Date: 2001-01-23
Classification: B01J,C07F,C08F,Y10S

Abstract:
A process for the polymerization of olefins comprisinga) selecting a metallocene catalyst comprising a metallocene compound described by the formula(CpR.sub.4)--C.sub.m H.sub.2m --CR'.sub.k R"".sub.2-k --C.sub.n H.sub.2n --(CpR.sub.4)MQ.sub.2whereinM is a Group IVb metal,Q is a hydrocarbyl radical having from 1 to 20 carbon atoms or a halogen, each Q being the same or different,Cp is a cyclopentadienyl ring,R is a substituent on a cyclopentadienyl ring and can be H or a hydrocarbon radical having 1 to 9 carbon atoms, each R being the same or different,each (CpR.sub.4) being the same or different,m is 0, 1, 2 or 3,n is 0, 1, 2, or 3,m+n is 0, 1, 2 or 3,k is 1 or 2R' is an electron-donor substituent of general formulaR'""ZR"""".sub.jwhereinR'"" is a rigid unsaturated hydrocarbon radical selected from the group consisting of an aryl and arylalkyl between Z and the bridge such that Z is separated from the bridge by 2 to 5 carbon atoms wherein an aryl ring carbon is bonded directly to a bridge carbon,Z is nitrogen, phosphorus, oxygen or sulphur,R"""" is H or an alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl having a maximum of 15 carbon atoms, each R"""" being the same or different,j is 1 when Z=O or S and 2 when Z=N or P,R"" is as indicated for R""""b) introducing the catalyst into a polymerization reaction zone containing an olefin monomer and maintaining the reaction zone under polymerization reaction conditions; andc) extracting a polymer product.