1
James C Stevens, David R Neithamer: Metal complex compounds. The Dow Chemical Company, Douglas N Delime, November 12, 1991: US05064802 (464 worldwide citation)

A monocyclopentadienyl or substituted monocyclopentadienyl metal complex containing compound useful as a polymerization catalyst corresponding to the formula:


2
Howard C Welborn Jr: Supported polymerization catalyst. Exxon Chemical Patents, M B Kurtzman, February 28, 1989: US04808561 (464 worldwide citation)

An olefin polymerization supported catalyst comprising a support and the reaction product of a metallocene of Group 4b, 5b or 6b of the Periodic Table and an alumoxane, said reaction product formed in the presence of a support.


3
Walter Kaminsky, Heinrich Hahnsen, Klaus Kulper, Rudiger Woldt: Process for the preparation of polyolefins. Hoechst Aktiengesellschaft, Connolly and Hutz, September 17, 1985: US04542199 (323 worldwide citation)

The invention relates to a process for the preparation of polyolefins by polymerizing olefins of the formula CH.sub.2 CHR in which R=H or C.sub.1 -C.sub.10 alkyl, on their own or as a mixture, if appropriate together with C.sub.4 -C.sub.12 .alpha.,.omega.-diolefins, in solvents, liquid monomers or t ...


4
John A Ewen: Hafnium metallocene catalyst for the polymerization of olefins. Fina Technology, John K Abokhair, Stuart L Watt, M Norwood Cheairs, December 27, 1988: US04794096 (318 worldwide citation)

The present invention provides a catalyst system for the polymerization and copolymerization of olefins with the system comprising a chiral, stereorigid hafnium metallocene catalyst in combination with an aluminum compound. The aluminum compound is preferably an alumoxane and may be a mixture of alu ...


5
Jo Ann M Canich, Gary F Licciardi: Mono-Cp heteroatom containing group IVB transition metal complexes with MAO: supported catalyst for olefin polymerization. Exxon Chemical Patents, Myron B Kurtzman, October 15, 1991: US05057475 (312 worldwide citation)

The invention is a supported catalyst system including an inert support material, a Group IV B transition metal component and an alumoxane component which may be employed to polymerize olefins to produce a high molecular weight polymer.


6
John A Ewen, Abbas Razavi: Process and catalyst for producing syndiotactic polyolefins. Fina Technology, Stuart L Watt, John K Abokhair, M Norwood Cheairs, January 9, 1990: US04892851 (286 worldwide citation)

The invention provides a metallocene catalyst for use in preparing syndiotactic polyolefins. The catalyst comprises a bridged metallocene in which one of the cyclopentadienyl rings is substituted in a substantially different manner from the other ring. It was discovered that this type of catalyst is ...


7
Jo Ann M Canich: Monocyclopentadienyl transition metal olefin polymerization catalysts. Exxon Chemical Patents, Jaimes Sher, Myron B Kurtzman, March 17, 1992: US05096867 (277 worldwide citation)

The invention is a catalyst system including a Group IV B transition metal component and an alumoxane component which may be employed to polymerize olefins to produce a high molecular weight polymer.


8
John A Ewen, Howard C Welborn Jr: Process and catalyst for producing polyethylene having a broad molecular weight distribution. Exxon Research & Engineering Co, M B Kurtzman, July 23, 1985: US04530914 (276 worldwide citation)

Polyolefins having a broad molecular weight distribution are obtained by polymerizing ethylene or higher alpha-olefins in the presence of a catalyst system comprising two or more metallocenes each having different propagation and termination rate constants and alumoxane.


9
Mario Ferraris, Francesco Rosati, Sandro Parodi, Enzo Giannetti, Giuseppe Motroni, Enrico Albizzati: Catalyst components and catalysts for the polymerization of alpha-olefins. Montedison S p A, August 16, 1983: US04399054 (275 worldwide citation)

Catalyst components which comprise the reaction product of a Ti compound and a Mg dihalide and which are in the form of spherical particles having an average diameter of 1 to 100 microns, a surface area of 300 to 500 m.sup.2 /g, and a porosity of 0.3 to 0.4 cc/g are disclosed, as are catalysts also ...


10
Andreas Winter, Martin Antberg, Walter Spaleck, Jurgen Rohrmann, Volker Dolle: 2-substituted disindenylmetallocenes, process for their preparation, and their use as catalysts in the polymerization of olefins. Hoechst Aktiengesellschaft, September 8, 1992: US05145819 (246 worldwide citation)

The novel metallocenes of the formula I ##STR1## in which, preferably, M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are alkyl or halogen, R.sup.3 and R.sup.4 are hydrogen, R.sup.5 and R.sup.6 are alkyl or haloalkyl, --(CR.sup.8 R.sup.9).sub.m --R.sup.7 --(CR.sup.8 R.sup.9).sub.n -- is a single- or multi ...