Process for producing an olefin polymer using a metallocene
AssigneePhillips Petroleum Company
InventorsM. Bruce Welch, Syriac J. Palackal, Bryan E. Hauger, David W. Dockter, Alexander Köppl, Helmut G. Alt
Life of this patent
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Abstract
Metallocene having two cyclic dienyl groups connected by a single carbon having an aryl substituent and a terminally unsaturated hydrocarbyl substituent, olefin polymerization catalyst systems prepared therefrom, and the use of such catalyst systems are disclosed.
Claims8
A process for producing a polymer comprising contacting at least one olefin under suitable reaction conditions with a solid catalyst system prepared by combining a metallocene with a solution of an organo aluminoxane cocatalyst and conducting prepolymerization to produce a prepolymerized solid, then washing the solid to remove soluble components and recovering the solid catalyst system, said metallocene being selected from those of the formula R(Z)(Z)MQk wherein each Z is bound to M and is the same or different and is a cyclodienyl-type ligand selected from substituted or unsubstituted cyclopentadienyl, indenyl, tetrahydroindenyl, octahydrofluorenyl, and fluorenyl ligands;
- R is a structural bridge linking the Z's which is a single carbon atom connecting the Z's, wherein the other valences of the bridging carbon are satisfied by a terminally unsaturated hydrocarbyl substituent and by an aryl group, and M is a metal selected from the group consisting of IVB, VB, and VIB metals of the periodic table, each Q is the same or different and is selected from the group consisting of hydrogen, halogens, and hydrocarbyl or hydrocarboxyl radicals having 1 to 20 carbon atoms;
- k is a number sufficient to fill out the remaining valences of M.
Dependencies are inferred from the claim text.