1
Robert K Rosen, Daniel D VanderLende: Highly soluble olefin polymerization catalyst activator. The Dow Chemical Company, July 6, 1999: US05919983 (234 worldwide citation)

A catalyst activator, comprising a cation which is a Bronsted acid capable of donating a proton, and an inert, compatible, noncoordinating, anion, characterized by a solubility constant at 25.degree. C. in hexane, cyclohexane or methylcyclohexane of at least 5 weight percent.


2
Robert K Rosen, Peter N Nickias, David D Devore, James C Stevens, Francis J Timmers: Addition polymerization process using stabilized reduced metal catalysts. The Dow Chemical Company, December 20, 1994: US05374696 (102 worldwide citation)

Complexes useful as addition polymerization catalysts, a process for their manufacture and addition polymerization processes wherein the complex comprises a Group 4 metal in the .sup.+ 3 oxidation state, a delocalized .pi.-bonding moiety, and at least one stabilizing ligand.


3
David D Devore, Francis J Timmers, David R Wilson, Robert K Rosen: Titanium(II) or zirconium(II) complexes and addition polymerization catalysts therefrom. The Dow Chemical Company, November 28, 1995: US05470993 (82 worldwide citation)

Novel titanium or zirconium complexes containing one and only one cyclic delocalized, anionic, .pi.-bonded group wherein the metal is in the +2 formal oxidation state and having a bridged ligand structure, also referred to as constrained geometry complexes; catalytic derivatives of such complexes; m ...


4
Robert E LaPointe, Robert K Rosen, Peter N Nickias: Process for preparing addition polymerization catalysts via metal center oxidation. The Dow Chemical Company, February 23, 1993: US05189192 (70 worldwide citation)

Addition polymerization catalysts comprising a derivative of a Group 4-8 metal compound prepared by metal center oxidation.


5
James C Stevens, Robert K Rosen: Reduced oxidaton state group 4 metal complexes, addition polymerization catalysts, and polymerization process. The Dow Chemical Company, January 11, 2000: US06013819 (57 worldwide citation)

Metal complexes having constrained geometry and a process for preparation thereof, addition polymerization catalysts formed therefrom, processes for preparation of such addition polymerization catalysts, methods of use, and novel polymers formed thereby, including ElPE resins and pseudo-random copol ...


6
Robert K Rosen, Brian W S Kolthammer: Synthesis of cyclopentadienyl metal coordination complexes from metal hydrocarbyloxides. The Dow Chemical Company, December 30, 1997: US05703257 (55 worldwide citation)

A process for preparing bridged mono- and bis(cyclopentadienyl) metal dihydrocarbyloxy coordination complexes (I) by contacting in the presence of an aprotic organic diluent a metal compound of the formula M(OR).sub.4 with a dianionic salt compound. A process for preparing bridged mono- and bis(cycl ...


7
Robert K Rosen, James C Stevens, John C Tracy: Olefin addition polymerization catalyst composition. The Dow Chemical Company, June 13, 2000: US06074977 (51 worldwide citation)

Catalyst compositions that are highly tolerant of catalyst poisons comprising a cationic or zwitterionic Group 4 metal complex of the constrained geometry type and an organoaluminum hydrocarbyloxide compound according to the formula R.sup.1.sub.2 Al(OR.sup.2),


8
David D Devore, Francis J Timmers, James C Stevens, Robert K Rosen: Group 4 metal diene complexes and addition polymerization catalysts therefrom. The Dow Chemical Company, January 23, 1996: US05486632 (30 worldwide citation)

Novel Group 4 metal complexes containing one and only one cyclic delocalized, anionic, .pi.-bonded group wherein the metal is in the +4 formal oxidation state and having a bridged ligand structure, also referred to as constrained geometry complexes and a conjugated diene divalent anionic ligand grou ...


9
Peter N Nickias, David D Devore, Francis J Timmers, Robert K Rosen, Robert D Mussell: Preparation of addition polymerization catalysts via Lewis acid mitigated metal center oxidation. The Dow Chemical Company, September 13, 1994: US05347024 (25 worldwide citation)

Addition polymerization catalysts comprising a derivative of a titanium or zirconium in the +4 oxidation state prepared by metal center oxidation and cation complex formation of a reduced metal precursor complex via electron transfer in a single step by use of a neutral organic oxidant, optionally i ...


10
Robert K Rosen, David D Devore, Peter N Nickias, James C Stevens, Francis J Timmers: Homogenous, stabilized, reduced metal addition polymerization catalysts, process for preparation and method of use. The Dow Chemical Company, February 27, 1996: US05494874 (20 worldwide citation)

Complexes useful as addition polymerization catalysts, a process for their manufacture and addition polymerization processes wherein the complex comprises a Group 4 metal in the .sup.+ 3 oxidation state, a delocalized n-bonding moiety, and at least one stabilizing ligand.