Patents by Inventor Dusan Jeremic
Dusan Jeremic has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9708479Abstract: A process for polymerizing ethylene in the presence of a polymerization catalyst by copolymerizing ethylene with a comonomer selected from the group of C4-C10 alpha-olefins in three polymerization stages. The polymers produced in the three stages have different melt flow rates. The polymer composition produced by the process has good mechanical properties and can be used for making pipes. The process has a good productivity and provides a stable and economic operation.Type: GrantFiled: September 24, 2014Date of Patent: July 18, 2017Assignee: BOREALIS AGInventors: Thomas Hjertberg, Ravindra Tupe, Udo Wahner, Tanja Piel, Yi Liu, Alexandra Romina Albunia, Floran Prades, Joseph Thorman, Dusan Jeremic
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Publication number: 20160369091Abstract: A process for polymerizing ethylene in the presence of a polymerization catalyst by copolymerizing ethylene with a comonomer selected from the group of C4-C10 alpha-olefins in three polymerization stages. The polymers produced in the three stages have different melt flow rates. The polymer composition produced by the process has good mechanical properties and can be used for making pipes. The process has a good productivity and provides a stable and economic operation.Type: ApplicationFiled: September 24, 2014Publication date: December 22, 2016Inventors: Thomas HJERTBERG, Ravindra TUPE, Undo WAHNER, Tanja Piel, Yi LIU, Romina Alexandra ALBUNIA, Floran PRADES, Joseph THORMAN, Dusan JEREMIC
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Patent number: 8829137Abstract: Polyethylene films having a good balance of optical and mechanical properties are disclosed. The films are derived from ethylene copolymer compositions made with a suitably substituted phosphinimine catalyst. The ethylene copolymers have very narrow molecular weight distributions and broadened comonomer distributions.Type: GrantFiled: February 27, 2012Date of Patent: September 9, 2014Assignee: Nova Chemicals (International) S.A.Inventors: Patrick Lam, Victoria Ker, Charles Ashton Garret Carter, Benjamin Milton Shaw, Cliff Robert Baar, Alexei Kazakov, Ian Douglas McKay, Dusan Jeremic
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Patent number: 8536081Abstract: Supported catalyst system for the polymerization of olefins, having at least two different monocyclopentadienyl transition metal compounds, one or more activators including an ionic compound having (i) a cation and (ii) an anion having up to 100 non-hydrogen atoms and the anion containing at least one substituent comprising a moiety having an active hydrogen, and one or more support materials. The supported “mixed or dual site” catalyst systems having different monocyclopentadienyl catalysts when activated by specific ionic activators lead to catalyst systems showing an improved balance of properties which may be used to prepare LLDPE polymers having broad melt flow ratios.Type: GrantFiled: November 10, 2005Date of Patent: September 17, 2013Assignee: Ineos Europe LimitedInventors: Grant Berent Jacobsen, Dusan Jeremic, Sergio Mastroianni, Ian Douglas McKay
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Publication number: 20120238720Abstract: Polyethylene films having a good balance of optical and mechanical properties are disclosed. The films are derived from ethylene copolymer compositions made with a suitably substituted phosphinimine catalyst. The ethylene copolymers have very narrow molecular weight distributions and broadened comonomer distributions.Type: ApplicationFiled: February 27, 2012Publication date: September 20, 2012Applicant: NOVA CHEMICALS (INTERNATIONAL) S.A.Inventors: Patrick Lam, Victoria Ker, Charles Ashton Garret Carter, Benjamin Milton Shaw, Cliff Robert Baar, Alexei Kazakov, Ian Douglas McKay, Dusan Jeremic
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Patent number: 7863213Abstract: A supported catalyst for olefin polymerization comprises a selected ionic activator, a selected organometallic catalyst and a support material. The selected activator must contain an active hydrogen moeity. The organometallic catalyst is characterized by having a phosphinimine ligand and a substituted cyclopentadienyl ligand (which contains from 7 to 30 carbon atoms). The supported catalyst exhibits excellent activity in gas phase olefin polymerizations and may be used under substantially “non-fouling” polymerization conditions.Type: GrantFiled: May 7, 2007Date of Patent: January 4, 2011Assignee: Nova Chemicals (International) S.A.Inventors: Ian McKay, Dusan Jeremic, Grant Berent Jacobsen, Sergio Mastroianni
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Patent number: 7476715Abstract: The use of high activity “Single Site” polymerization catalysts often causes the fouling of polymerization reactors. The problem is particularly acute with gas phase polymerizations. While not wishing to be bound by theory it is believed that the fouling is initiated by the buildup of static charges in the reactor. The use of anti-static agents mitigates this problem, but typical antistatic agents contain polar species, which can deactivate the polymerization catalyst. We have now discovered that the use of a porous metal oxide support allows large levels of a selected antistatic agent to be used in a manner that reduces static/fouling problems in highly active polymerization catalysts.Type: GrantFiled: May 7, 2007Date of Patent: January 13, 2009Assignees: Nova Chemicals(International) S.A., Ineos Europe LimitedInventors: Ian McKay, Dusan Jeremic, Paul Mesquita, Grant Berent Jacobsen, Sergio Mastroianni
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Publication number: 20080139763Abstract: Supported catalyst systems for the polymerisation of olefins, comprise (a) at least two different monocyclopentadienyl transition metal compounds, (b) one or more activators comprising an ionic compound comprising (i) a cation and (ii) an anion having up to 100 non-hydrogen atoms and the anion containing at least one substituent comprising a moiety having an active hydrogen, and (c) one or more support materials. The, supported “mixed or dual site” catalyst systems comprising different monocyclopentadienyl catalysts when activated by specific ionic activators lead to catalyst systems showing an improved balance of properties which may be used to prepare LLDPE polymers having broad melt flow ratios.Type: ApplicationFiled: November 10, 2005Publication date: June 12, 2008Inventors: Grant Berent Jacobsen, Dusan Jeremic, Sergio Mastroianni, Ian Douglas McKay
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Publication number: 20080045406Abstract: A supported catalyst for olefin polymerization comprises a selected ionic activator, a selected organometallic catalyst and a support material. The selected activator must contain an active hydrogen moeity. The organometallic catalyst is characterized by having a phosphinimine ligand and a substituted cyclopentadienyl ligand (which contains from 7 to 30 carbon atoms). The supported catalyst exhibits excellent activity in gas phase olefin polymerizations and may be used under substantially “non-fouling” polymerization conditions.Type: ApplicationFiled: May 7, 2007Publication date: February 21, 2008Inventors: Ian McKay, Dusan Jeremic, Grant Berent Jacobsen, Sergio Mastroianni
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Publication number: 20070282085Abstract: The use of high activity “Single Site” polymerization catalysts often causes the fouling of polymerization reactors. The problem is particularly acute with gas phase polymerizations. While not wishing to be bound by theory it is believed that the fouling is initiated by the buildup of static charges in the reactor. The use of anti-static agents mitigates this problem, but typical antistatic agents contain polar species, which can deactivate the polymerization catalyst. We have now discovered that the use of a porous metal oxide support allows large levels of a selected antistatic agent to be used in a manner that reduces static/fouling problems in highly active polymerization catalysts.Type: ApplicationFiled: May 7, 2007Publication date: December 6, 2007Inventors: Ian McKay, Dusan Jeremic, Paul Mesquita, Grant Berent Jacobsen, Sergio Mastroianni
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Patent number: 6750170Abstract: Single site catalysts which contain a transition metal, a cyclopentadienyl may be activated with alumoxanes in the gas, solution or group-containing ligand, and a phosphinimine ligand slurry phase polymerization of olefin. Alumoxanes contain residual aluminum alkyls which may poison the catalysts. The residual aluminum alkyls may be bound and/or removed from the alumoxanes by treatment with carbohydrates such as cellulose, starch or sugar.Type: GrantFiled: December 4, 2001Date of Patent: June 15, 2004Assignee: Nova Chemicals (International) S.A.Inventors: Peter Phung Minh Hoang, Dusan Jeremic, Jason Roy Kearns, Iain McLaren Coulter, Robert D. Donaldson
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Patent number: 6440890Abstract: New group 4 organometallic complexes are characterized by having a phosphinimine ligand and two or more cyclopentadienyl ligands. Certain of these complexes exhibit unusual behavior when examined by nuclear magnetic resonance (NMR) techniques. Well defined crystals of the inventive complexes have been isolated and analyzed by x-ray crystallography. The complexes have also been found to be polymerization catalysts which are surprisingly more active than their simple metallocene analogs.Type: GrantFiled: September 6, 2000Date of Patent: August 27, 2002Assignee: NOVA Chemicals (International) S.A.Inventors: Rupert Edward von Haken Spence, Stephen John Brown, Ryan Paul Wurz, Dusan Jeremic, Douglas W. Stephan
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Patent number: 6420300Abstract: A catalyst system comprises an organometallic complex of a group 4 metal having a ketimide ligand. The organometallic complex preferably also contains a cyclic ligand which forms a delocalized pi-bond with the metal (such as a cyclopentadienyltype ligand). Preferred organometallic complexes may be activated with a so-called “substantially non coordinating anion” to form a low cost cocatalyst system which is excellent for the preparation of olefin copolymers having both high molecular weight and very low density.Type: GrantFiled: July 14, 2000Date of Patent: July 16, 2002Assignee: Nova Chemicals (International) S.A.Inventors: John McMeeking, Xiaoliang Gao, Rupert Edward von Haken Spence, Stephen John Brown, Dusan Jeremic
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Publication number: 20020086991Abstract: Aluminoxanes are used as activators for the gas, solution or slurry phase polymerization of olefins in the presence of single site catalysts. Aluminoxanes contain residual aluminum alkyls which may poison the catalysts. The residual aluminum alkyls may be bound an/or removed from the aluminoxanes by treatment with carbohydrates such as cellulose, starch or sugar.Type: ApplicationFiled: December 4, 2001Publication date: July 4, 2002Applicant: NOVA CHEMICALS (INTERNATIONAL) S. A.Inventors: Peter Phung Minh Hoang, Dusan Jeremic, Jason Roy Kearns, Iain McLaren Coulter, Robert D. Donaldson
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Patent number: 6355744Abstract: Organometallic complexes of titanium or zirconium having only three ligands (namely a cyclopentadienyl ligand, a phosphinimine ligand and an activatable ligand) are catalyst components for olefin polymerization. Preferred polymerization systems are prepared by combining the organometallic complexes with an ionic activator and/or an alumoxane. Preferred catalyst components contain titanium (III) and are used in ethylene polymerization.Type: GrantFiled: September 6, 2000Date of Patent: March 12, 2002Assignee: Nova Chemicals (International) S.A.Inventors: Rupert Edward von Haken Spence, Douglas W. Stephan, Stephen John Brown, Dusan Jeremic, Qinyan Wang
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Publication number: 20020010078Abstract: A catalyst which is useful in slurry or gas phase olefin polymerizations and which is prepared by depositing a combination of an organometallic complex of a group 4 metal and a so-called ionic activator on a metal oxide support. The organometallic complex is characterized by being unbridged and by having a cyclopentadienyl ligand, a phosphinimine ligand and an activatable ligand. The “ionic activator” (for example, triphenylcarbenium tetrakis (pentafluorophenyl) boron) is co-deposited with the organometallic complex. The metal oxide support is pre-treated with, for example, an aluminum alkyl in an amount which is at least equivalent to the molar concentration of surface hydroxyls on the support.Type: ApplicationFiled: April 4, 2001Publication date: January 24, 2002Applicant: NOVA CHEMICAL (INTERNATIONAL) S.A.Inventors: Dusan Jeremic, Stephen John Brown, Ian McKay
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Patent number: 6340771Abstract: Aluminoxanes are used as activators for the gas, solution or slurry phase polymerization of olefins in the presence of single site catalysts. Aluminoxanes contain residual aluminum alkyls which may poison the catalysts. The residual aluminum alkyls may be bound an/or removed from the aluminoxanes by treatment with carbohydrates such as cellulose, starch or sugar.Type: GrantFiled: December 22, 1999Date of Patent: January 22, 2002Assignee: Nova Chemicals (International) S. A.Inventors: Peter Phung Minh Hoang, Dusan Jeremic, Jason Roy Kearns, Iain McLaren Coulter, Robert D. Donaldson
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Patent number: 6234950Abstract: An organometallic complex of a group 4 metal having a cyclopentadienyl ligand and a heterosubstituted phosphinimine ligand is a catalyst component for olefin polymerization. The heterosubstituted phosphinimine ligand may be conveniently and inexpensively synthesized using readily available precursors which are comparatively non-pyrophoric. The resulting catalysts are highly active for ethylene copolymerization, particularly when activated with an alumoxane or ionic activator.Type: GrantFiled: November 15, 1999Date of Patent: May 22, 2001Assignee: Nova Chemicals (International) S.A.Inventors: Rupert Edward von Haken Spence, Linda Koch, Dusan Jeremic, Stephen John Brown
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Patent number: 6235853Abstract: A slurry polymerization process uses an unsupported catalyst component which is an organometallic complex having a phosphinimine ligand and a cyclopentadienyl-type ligand. The use of the unsupported catalyst component allows simple, inexpensive catalyst addition techniques to be used in a slurry polymerization process. The catalyst component is highly active for ethylene (co)polymerization in the process of this invention.Type: GrantFiled: November 15, 1999Date of Patent: May 22, 2001Assignee: Nova Chemicals (International) S.A.Inventors: Ian McKay, Dusan Jeremic, Qinyan Wang, P. Scott Chisholm
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Patent number: 6140264Abstract: The present invention provides a novel process for preparing a catalyst, preferably free of electron donor, useful in gas phase polymerization of olefins having a broad polydispersity.Type: GrantFiled: May 12, 1998Date of Patent: October 31, 2000Assignee: Nova Chemicals Ltd.Inventors: Mark Kelly, Dusan Jeremic, Victoria Ker, Charles Russell