1
John A Ewen, Howard C Welborn Jr: Process and catalyst for producing reactor blend polyolefins. Exxon Research & Engineering Company, M B Kurtzman, June 26, 1990: US04937299 (321 worldwide citation)

Polyolefin reactor blends obtained by polymerization of ethylene and higher alpha-olefins in the presence of a catalyst system comprising two or more metallocenes and alumoxane.


2
Phil M Stricklen: Process for producing polyolefins and polyolefin catalysts. Phillips Petroleum Company, Phillips Petroleum Company, July 3, 1990: US04939217 (155 worldwide citation)

A process for producing a polyolefin having a multimodal molecular weight distribution wherein the polymerization is conducted in the presence of hydrogen and a catalyst system containing aluminoxane and at least two different metallocenes each having different olefin polymerization termination rate ...


3
John A Ewen, Howard C Welborn Jr: Process and catalyst for producing polyethylene having a broad molecular weight distribution. Exxon Research & Engineering Company, M B Kurtzman, June 19, 1990: US04935474 (117 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.


4
Anthony D Caunt, Paul D Gavens, John McMeeking: Olefine polymerization process. Imperial Chemical, Cushman Darby & Cushman, May 24, 1983: US04385161 (67 worldwide citation)

A catalyst component is a transition metal composition which is obtained by reacting together an inert particulate material, an organic magnesium compound, a halogen-containing compound such as carbon tetrachloride silicon tetrachloride or boron trichloride and a specified transition metal compound ...


5
Jean Pierre Hermans, Paul Henrioulle: Preactivated catalytic complex spogospheres. Solvay & Cie, Spencer & Kaye, July 1, 1980: US04210729 (53 worldwide citation)

Storage stability of Ziegler-type catalysts for .alpha.-olefin polymerization and having a specific surface greater than 75 m.sup.2 /g is improved by treating the catalysts with a preactivator which is an organic compound of a metal of one of Groups Ia, IIa, IIb and IIIa of the Periodic Table.


6
Walter Kaminsky, Stefan Niedoba: Process for the preparation of optically active polyolefins. Hoechst Aktiengesellschaft, June 12, 1990: US04933403 (51 worldwide citation)

Process for the preparation of optically active polyolefins by polymerizing olefins of the formula CH.sub.2 .dbd.CHR in which R.dbd.C.sub.1 C.sub.10 -alkyl in the presence of an optically active catalyst system composed of an optically active transition metal compound containing only enantiomer (R- ...


7
Takashi Fujita: Polymerization of ethylene. Mitsubishi Petrochemical Company, Oblon Spivak McClelland Maier & Neustadt, June 5, 1990: US04931517 (50 worldwide citation)

A process for the polymerization of ethylene comprises bringing ethylene or ethylene and at least one .alpha.-olefin in contact with a catalyst comprising a metallocene compound of a transition metal selected from Groups IVB, VB and VIB, an aluminoxane and a silicon compound having an Si-O-C bond fo ...


8
Donald E Gessell: High efficiency titanate catalyst for polymerizing olefins. The Dow Chemical Company, August 7, 1979: US04163831 (50 worldwide citation)

Compositions exhibiting high catalytic activity in the polymerization of .alpha.-olefins are provided by reacting compound of titanium, e.g., a titanate such as tetra(isopropoxy)titanium, an organomagnesium compound or complex such as a hydrocarbon soluble complex of dialkyl magnesium and an alkyl a ...


9
Nobuyuki Kuroda, Tatsuo Horie, Kazuo Matsuura, Kunimichi Kubo, Mituji Miyoshi: Continuous process for the preparation of polyolefins having widely distributed molecular weights. Nippon Oil Company, Jordan and Hamburg, November 8, 1983: US04414369 (45 worldwide citation)

Polyolefins having a wide distribution of molecular weights are prepared in a plural stage process, by initially polymerizing the olefins in the presence of a solvent, hydrogen and a highly active Ziegler type catalyst under pressure, and beneath a gas phase containing an inert gas, to form in the f ...


10
Karl Ziegler deceased, Heinz Breil, Erhard Holzkamp, Heinz Martin: Polymerization of ethylenically unsaturated hydrocarbons. Studiengesellschaft Kohle m b H, Burgess Dinklage & Sprung, December 13, 1977: US04063009 (45 worldwide citation)

Alpha olefins are polymerized alone or in admixture at comparatively low pressures to produce polymers employing a two-component catalyst wherein one component is an organozinc or organomagnesium compound, e.g. zinc diethyl, magnesium diphenyl, propyl magnesium chloride, etc. The other component is ...