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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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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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Arriola Daniel J, Jazdazewski Brian A, Timmers Francis J, Vosejpka Paul C, Wagner Nicole L, Landes Brian G, Jueptner Guenter, Bank David H, Wenzel Timothy T: Production of blockcopolymers by amorphous polymer segment interchange via metathesis. Dow Global Technologies, Arriola Daniel J, Jazdazewski Brian A, Timmers Francis J, Vosejpka Paul C, Wagner Nicole L, Landes Brian G, Jueptner Guenter, Bank David H, Wenzel Timothy T, RUSZALA Lois K, March 6, 2008: WO/2008/027268 (24 worldwide citation)

A cross-metathesized product mixture is prepared by contacting a metathesis catalyst under metathesis conditions with a composition comprising two or more chemically distinguishable ethylenically unsaturated polymers, at least one of said ethylenically unsaturated polymers (first polymer) having fro ...


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Arriola Daniel J, Timmers Francis J, Vosejpka Paul C, Wagner Nicole L: Metathetic production of functionalized polymers. Dow Global Technologies, Arriola Daniel J, Timmers Francis J, Vosejpka Paul C, Wagner Nicole L, ZUCKERMAN Marie F, January 15, 2009: WO/2009/009158 (23 worldwide citation)

A process for preparing a functionalized polymer, the steps of the process involving contacting a metathesis catalyst under metathesis conditions with a composition comprising: (a) at least one ethylenically unsaturated polymer characterized in that the unsaturated polymer is substantially immune to ...


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Dion Robert P, Jazdzewski Brian A, Timmers Francis J, Watson Keith J, Vosejpka Paul C: Catalysts and methods for polymerizing macrocyclic oligomers. Dow Global Technologies, Dion Robert P, Jazdzewski Brian A, Timmers Francis J, Watson Keith J, Vosejpka Paul C, COHN Gary C, November 10, 2005: WO/2005/105889 (11 worldwide citation)

Cyclic oligomers containing ester linkages are polymerized in the presence of a catalyst having at least one oxygen atom bonded to two metal atoms. At least one of the metal atoms is a tin atom, which is preferably tetravalent, i.e., bonded to three other groups in addition to the oxygen atom. The o ...


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Devore David D, Timmers Francis J, Neithamer David R: Metallocene cocatalyst. Dow Chemical, January 13, 1999: EP0889911-A1 (9 worldwide citation)

Boratabenzene cocatalysts, especially novel pentafluorophenyl boratabenzenes, are useful cocatalysts or activators with metallocenes. They are less expensive than prior art activators, are soluble and offer more irreversible reactions. Compositions comprise at least one metallocene catalyst and at l ...


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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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Kuhlman Roger Lewis, Sammler Robert Louis, Timmers Francis J: Delayed action catalysts and methods for polymerizing macrocyclic oligomers. Dow Global Technologies, Kuhlman Roger Lewis, Sammler Robert Louis, Timmers Francis J, COHN Gary C, January 26, 2006: WO/2006/009735 (8 worldwide citation)

Cyclic oligomers containing ester linkages are polymerized in the presence of a dialkyltin di(carboxylate) catalyst. The catalyst provides a latency period followed by a rapid polymerization to form a high molecular weight polymer.


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Arriola Daniel J, Bokota Marilyn, Timmers Francis J: Improved process for manufacture of polymers. Dow Global Technologies, Arriola Daniel J, Bokota Marilyn, Timmers Francis J, DELINE Douglas N, April 1, 2004: WO/2004/026925 (7 worldwide citation)

A process for preparing interpolymers of ethylene and one or more C3-8 olefin monomers comprising contacting a monomer mixture comprising ethylene and one or more C3-8 olefin monomers with a catalyst composition comprising a Group 4 metal complex of a polyvalent, Lewis base ligand under addition pol ...