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Stevens James C, Timmers Francis J, Wilson David R, Schmidt Gregory F, Nickias Peter N, Rosen Robert K, Knight George W, Lai Shih Yaw: Constrained geometry addition polymerization catalysts, processes for their preparation, precursors therefor, methods of use, and novel polymers formed therewith.. Dow Chemical, March 13, 1991: EP0416815-A2 (544 worldwide citation)

Metal coordination complexes comprising a metal of Group 3 (except Sc), 4-10 or the lanthanide series and a delocalized PI -bonded moiety have said moiety substituted with a constrain-inducing moiety which reduces the angle at the metal between the centroid of said PI -bonded moiety and at least one ...


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Lapointe Robert E, Rosen Robert K, Nickias Peter N: Process for preparing addition polymerization catalysts via metal center oxidation.. Dow Chemical, July 22, 1992: EP0495375-A2 (159 worldwide citation)

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


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Timmers Francis J, Devore David D, Stevens James C, Rosen Robert K, Patton Jasson T, Neithamer David R: Biscyclopentadienyl diene complexes. Dow Chemical, May 28, 1997: EP0775148-A1 (26 worldwide citation)

Olefins are polymerized by the use of catalysts comprising biscyclopentadienyl, Group 4 transition metal complexes formed with conjugated dienes wherein the diene is bound to the transition metal either in the form of a sigma -complex or a pi -complex in combination with activating cocatalysts.


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Stevens James C, Nickias Peter N, Timmers Francis J, Rosen Robert K, Wilson David R, Knight George W, Schmidt Gregory F, Lai Shih Yaw: Constrained geometry addition polymerization catalysts, processes for their preparation, precursors therefor, methods of use, and novel polymers formed therewith. Dow Chemical, March 26, 1997: EP0764653-A2 (8 worldwide citation)

Hafnium or zirconium coordination complexes comprise a cyclopentadienyl or substituted cyclopentadienyl group forming part of a ring structure in which the metal is both bonded to an adjacent amidosilane moiety and held in association with the (substituted) cyclopentadienyl moiety. These complexes f ...


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Rosen Robert K, Vanderlende Daniel D: Highly soluble olefin polymerization catalyst activator. Dow Chemical, January 13, 1999: EP0889912-A1 (8 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 DEG C in hexane, cyclohexane or methylcyclohexane of at least 5 weight percent.


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Kolthammer Brian, Tracy John C, Cardwell Robert S, Rosen Robert K: Supported homogeneous catalyst complexes for olefin polymerization.. Dow Chemical, July 19, 1995: EP0662979-A1 (7 worldwide citation)

A supported catalyst complex having a Group 4 metal cyclopentadienyl derivative and an aluminoxane reacted with silica which show improved resistance to catalyst poisoning. The supported catalyst composition is particularly suitable for producing homogeneous ethylene polymers and copolymers having a ...


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Rosen Robert K, Nickias Peter N, Devore David D, Stevens James C, Timmers Francis J: Addition polymerization catalysts comprising reduced oxidation state metal complexes.. Dow Chemical, January 11, 1995: EP0632819-A1 (3 worldwide citation)

Addition polymerization catalysts comprising a metal complex containing a Group 4 metal in the +3 oxidation state, a delocalized pi -bonding moiety, and at least one stabilizing ligand, optionally in combination with an activating cocatalyst.


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GIAQUINTA Daniel, BUSACCA Robert S, ROSEN Robert K, VARNI John F, YODER Jeffrey C: [fr] SYSTÈMES DE RÉACTEURS PARALLÈLES ET PROCÉDÉS DE PRÉPARATION DE MATÉRIAUX, [en] PARALLEL REACTOR SYSTEMS AND METHODS FOR PREPARING MATERIALS. FREESLATE, MUNSELL Michael G, October 3, 2013: WO/2013/148669 (2 worldwide citation)

[en] Parallel reactor systems for synthesizing materials are disclosed. The reactor systems may be suitable for synthesizing materials produced from corrosive reagents. Methods for preparing materials by use of such parallel reactor systems are also disclosed.