Patents by Inventor Margarito Lopez
Margarito Lopez 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: 6777367Abstract: A process for the preparation of a supported metallocene catalyst incorporating metallocene and co-catalysts components on a support. There is provided a particulate catalyst support material in which an alumoxane co-catalyst is incorporated onto the support particles and contacted with a dispersion of a metallocene catalyst in an aromatic hydrocarbon solvent. The metallocene solvent dispersion and the alumoxane-containing support are mixed at a temperature of about 10° C. or less for a period sufficient to enable the metallocene to become reactively supported on the alumoxane support material. The supported catalyst is recovered from the aromatic solvent and then washed optionally with an aromatic hydrocarbon and then sequentially with a paraffinic hydrocarbon solvent at a temperature of about 10° C. or less. The washed catalyst is dispersed in a viscous mineral oil having a viscosity which is substantially greater that the viscosity of the paraffinic hydrocarbon solvent.Type: GrantFiled: February 13, 2001Date of Patent: August 17, 2004Assignee: Fina Technology, Inc.Inventors: William John Gauthier, Margarito Lopez, Donald Gordon Campbell, Jr.
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Publication number: 20040138055Abstract: Bridged catalyst component in which a bridge spans two cylcopentadienyl or aromatic groups. The Cp or aromatic groups are attached to the same or different heteroatoms of the bridge, which heteroatoms are also bonded to a metal. A catalyst system can be made by contacting the bridged component with a cocatalyst. Polymerization of olefins can be catalyzed by the system.Type: ApplicationFiled: October 23, 2003Publication date: July 15, 2004Applicant: Fina Technology, Inc.Inventors: Abbas Razavi, Margarito Lopez, Didier Baekelmans, Vladimir Marin
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Publication number: 20040102311Abstract: Bridged metallocene catalyst component in which a bridge spans two cyclopentadienyl groups, which Cp groups are attached to same or different heteroatoms of the bridge, which heteroatoms are also bonded to the metal. A catalyst systems is made by contacting the bridged component with a cocatalyst. Polymerization of olefins in catalyzed by the system.Type: ApplicationFiled: November 21, 2002Publication date: May 27, 2004Inventors: Abbas Razavi, Margarito Lopez, Didier Baekelmans
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Patent number: 6653254Abstract: Provided is a catalyst system for polymerization of monomers having at least one Ziegler-Natta polymerizable bond, comprising: a) a supported Ziegler-Natta transition metal catalyst having a magnesium component modified with a metallocene catalyst component, such that the ratio of magnesium component to metallocene component is within the range of about 1:1 to about 4:1, during its synthesis or production; and b) an effective co-catalyst.Type: GrantFiled: February 22, 1999Date of Patent: November 25, 2003Assignee: Fina Technology, INCInventors: Edwar Shoukri Shamshoum, Hong Chen, Margarito Lopez
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Patent number: 6559088Abstract: Provided is a catalyst system for polymerization of monomer having at least one Ziegler-Natta polymerizable bond comprising: c) a supported Ziegler-Natta transition metal catalyst component comprising a Group 15 atom having two groups selected from the group consisting of alkyl and aryl, wherein the support is a magnesium halo dialkylamide; and d) an effective co-catalyst.Type: GrantFiled: February 22, 1999Date of Patent: May 6, 2003Assignee: Fina Technology, Inc.Inventors: Edwar Shoukri Shamshoum, Hong Chen, Margarito Lopez
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Patent number: 6518377Abstract: A polyolefin metallocene catalyst which includes two metallocene components, a stereorigid isospecific metallocene catalyst component and a stereorigid syndiospecific metallocene catalyst component, both of which are supported upon the same support. A method of forming a catalyst system includes contacting the above catalyst with a cocatalyst or Lewis acid. A method of polymerization includes contacting an olefin with the catalyst system.Type: GrantFiled: September 1, 2000Date of Patent: February 11, 2003Assignee: Fina Technology, Inc.Inventors: Edwar S. Shamshoum, Margarito Lopez, Ted G. Harris, III, Sehyun Kim
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Publication number: 20020147105Abstract: Supported stereospecific catalysts and processes for the stereotactic propagation of a polymer chain derived from ethylenically unsaturated monomers which contain three or more carbon atoms or which are substituted vinyl compounds, such as styrene and vinyl chloride. One application is the stereospecific propagation of C3-C4 alpha olefins, particularly the polymerization of propylene to produce syndiotactic polypropylene over a supported metallocene catalyst comprising a stereospecific metallocene catalyst component incorporating a metallocene ligand structure having two sterically dissimilar cyclopentadienyl ring structures coordinated with the central transition metal atom. Both of the cyclopentadienyl groups are in a relationship with one another by virtue of bridge or substituent groups, which provide a stereorigid relationship relative to the coordinating transition metal atom to prevent rotation of said ring structures.Type: ApplicationFiled: April 2, 2002Publication date: October 10, 2002Inventors: Edwar S. Shamshoum, Margarito Lopez
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Publication number: 20020137624Abstract: Process of preparing silica-supported catalysts. A support material comprising silica particles impregnated with an alumoxane co-catalyst with at least one-half of the co-catalyst disposed within the internal pore volume of the silica is contacted with a dispersion of a metallocene catalyst in an aromatic solvent. The dispersion and support are mixed at a temperature of about 10° C. or less to enable the metallocene to become reactively supported on and impregnated within the alumoxane-impregnated silica particles. The supported catalyst is recovered from the aromatic solvent and washed with an aromatic hydrocarbon and then a paraffinic hydrocarbon at a temperature of about 10° C. or less. The washed catalyst is dispersed in a viscous mineral oil.Type: ApplicationFiled: February 13, 2001Publication date: September 26, 2002Inventors: William John Gauthier, Margarito Lopez, David John Rauscher, Don Gordon Campbell, Margaret Elaine Kerr
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Publication number: 20020137623Abstract: A process for the preparation of a supported metallocene catalyst incorporating metallocene and co-catalysts components on a support. There is provided a particulate catalyst support material in which an alumoxane co-catalyst is incorporated onto the support particles and contacted with a dispersion of a metallocene catalyst in an aromatic hydrocarbon solvent. The metallocene solvent dispersion and the alumoxane-containing support are mixed at a temperature of about 10° C. or less for a period sufficient to enable the metallocene to become reactively supported on the alumoxane support material. The supported catalyst is recovered from the aromatic solvent and then washed optionally with an aromatic hydrocarbon and then sequentially with a paraffinic hydrocarbon solvent at a temperature of about 10° C. or less. The washed catalyst is dispersed in a viscous mineral oil having a viscosity which is substantially greater that the viscosity of the paraffinic hydrocarbon solvent.Type: ApplicationFiled: February 13, 2001Publication date: September 26, 2002Inventors: William John Gauthier, Margarito Lopez, Donald Gordon Campbell
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Patent number: 6432860Abstract: Supported stereospecific catalysts and processes for the stereotactic propagation of a polymer chain derived from ethylenically unsaturated monomers which contain three or more carbon atoms or which are substituted vinyl compounds, such as styrene and vinyl chloride. One application is the stereospecific propagation of C3-C4 alpha olefins, particularly the polymerization of propylene to produce syndiotactic polypropylene over a supported metallocene catalyst comprising a stereospecific metallocene catalyst component incorporating a metallocene ligand structure having two sterically dissimilar cyclopentadienyl ring structures coordinated to the central transition metal atom. Both of the cyclopentadienyl groups are in a relationship with one another by virtue of bridge or substituent groups, which provide a stereorigid relationship relative to the coordinating transition metal atom to prevent rotation of said ring structures.Type: GrantFiled: March 22, 1999Date of Patent: August 13, 2002Assignee: Fina Technology, Inc.Inventors: Edwar S. Shamshoum, Margarito Lopez
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Patent number: 6376418Abstract: The invention provides a metallocene catalyst for use in preparing polyolefins having low molecular weight. The catalyst comprises a bridged metallocene in which one of the cyclopentadienyl rings is substituted in a substantially different manner from the other ring.Type: GrantFiled: April 27, 2000Date of Patent: April 23, 2002Assignee: Fina Technology, Inc.Inventors: Edwar S. Shamshoum, B. Raghava Reddy, Margarito Lopez
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Patent number: 6362125Abstract: A polyolefin metallocene catalyst which includes two metallocene components, a stereorigid isospecific metallocene catalyst component and a stereorigid syndiospecific metallocene catalyst component, both of which are supported upon the same support. A method of forming a catalyst system includes contacting the above catalyst with a cocatalyst or Lewis acid. A method of polymerization includes contacting an olefin with the catalyst system.Type: GrantFiled: May 22, 2000Date of Patent: March 26, 2002Assignee: Fina Technology, Inc.Inventors: Edwar S. Shamshoum, Margarito Lopez, Ted G. Harris, III, Sehyun Kim
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Patent number: 6225251Abstract: The invention provides a polymerization process with improved catalyst activity of a metallocene catalyst supported on silica treated with MAO, a process for supporting a metallocene compound on silica treated with MAO, a metallocene catalyst supported on silica treated with MAO within a certain temperature range and a process for making a metallocene catalyst supported on silica treated with MAO. The invention includes supporting the metallocene compound on a MAO-treated silica at a temperature of below 0° C. The supported catalyst is activated with an aluminum alkyl. The catalyst may be prepolymerized in a tubular reactor prior to being introduced into the polymerization reaction zone.Type: GrantFiled: May 4, 1999Date of Patent: May 1, 2001Assignee: Fina Technology, Inc.Inventors: Edwar S. Shamshoum, Margarito Lopez, B. Raghava Reddy, Theodore G. Harris
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Patent number: 6201081Abstract: The invention provides a polymerization process with improved catalyst activity of a metallocene catalyst supported on silica treated with MAO, a process for supporting a metallocene compound on silica treated with MAO, a metallocene catalyst supported on silica treated with MAO within a certain temperature range and a process for making a metallocene catalyst supported on silica treated with MAO. The invention includes supporting the metallocene compound on a MAO-treated silica at a temperature of below 0° C. The supported catalyst is activated with an aluminum alkyl. The catalyst may be prepolymerized in a tubular reactor prior to being introduced into the polymerization reaction zone.Type: GrantFiled: May 4, 1999Date of Patent: March 13, 2001Assignee: Fine Technology, Inc.Inventors: Edwar S. Shamshoum, Margarito Lopez, B. Raghava Reddy, Theodore G. Harris
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Patent number: 6143683Abstract: A polyolefin metallocene catalyst which includes two metallocene components, a stereorigid isospecific metallocene catalyst component and a stereorigid syndiospecific metallocene catalyst component, both of which are supported upon the same support. A method of forming a catalyst system includes contacting the above catalyst with a cocatalyst or Lewis acid. A method of polymerization includes contacting an olefin of at least 3 carbon atoms with the catalyst system.Type: GrantFiled: April 9, 1997Date of Patent: November 7, 2000Assignee: Fina Technology, Inc.Inventors: Edwar S. Shamshoum, Margarito Lopez, Ted G. Harris, III, Sehyun Kim
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Patent number: 6114480Abstract: The invention provides a metallocene catalyst for use in preparing polyolefins having low molecular weight. The catalyst comprises a metallocene compound generally described by the formula R"(C.sub.5 R.sub.4) (H.sub.2 C.sub.5 C.sub.4 H.sub.4)MeQ.sub.p wherein (C.sub.5 R.sub.4) is a substituted cyclopentadienyl ring; (H.sub.2 C.sub.5 C.sub.4 H.sub.4) is an indenyl ring; (C.sub.5 R.sub.4) has one R substituent in a distal position which is at least as bulky as a t-butyl radical; R" is a structural bridge between the (C.sub.5 R.sub.4) and (H.sub.2 C.sub.5 C.sub.4 H.sub.4) rings to impart stereorigidity; Q is a hydrocarbyl radical, such as an alkyl, aryl, alkenyl, alkylaryl or arylalkyl radical having 1-20 carbon atoms or is a halogen; Me is a Group IIIB, IVB, VB, or VIB metal as positioned in the Periodic Table of Elements; and p is the valence of Me minus 2.Type: GrantFiled: April 19, 1996Date of Patent: September 5, 2000Assignee: Fina Technology, Inc.Inventors: Edwar S. Shamshoum, B. Raghava Reddy, Margarito Lopez
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Patent number: 5968864Abstract: The invention provides a process for making a metallocene catalyst supported on silica treated with MAO. The invention includes supporting the metallocene compound on a MAO-treated silica at a temperature of below 0.degree. C. The supported catalyst is activated with an aluminum alkyl. The catalyst may be prepolymerized in a tubular reactor prior to being introduced into the polymerization reaction zone.Type: GrantFiled: December 20, 1996Date of Patent: October 19, 1999Assignee: Fina Technology, Inc.Inventors: Edwar S. Shamshoum, Margarito Lopez, B. Raghava Reddy, Theodore G. Harris
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Patent number: 5807800Abstract: Stereospecific catalysts and processes for the stereotactic polymerization of ethylenically unsaturated monomers, specifically C.sub.3 -C.sub.4 alpha olefins involving a molecular sieve supported metallocene catalyst comprising a stereospecific metallocene catalyst component and a co-catalyst component. The metallocene catalyst component incorporates a metallocene ligand structure having two sterically dissimilar cyclopentadienyl ring structures coordinated with the central transition metal atom. Both the metallocene catalyst component and the co-catalyst component are supported on a molecular sieve having an average effective pore size which is less than the kinetic diameter of at least one of said ring structures. This supported catalyst is contacted in a polymerization reaction zone with an ethylenically unsaturated monomer which contains 3 or more carbon atoms or which is a substituted vinyl compound under polymerization conditions to produce stereospecific polymerization of the monomer.Type: GrantFiled: February 11, 1997Date of Patent: September 15, 1998Assignee: Fina Technology, Inc.Inventors: Edwar S. Shamshoum, Margarito Lopez
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Patent number: 5789502Abstract: The present invention provides a process for control of desired properties in the polymer product. The catalyst system used in the process includes a supported metallocene catalyst precursor in combination with an oxyorganoaluminum. The process can be applied to the co-polymerization of propylene and ethylene. The randomness of the ethylene incorporation of the co-polymer product is increased as the amount of ethylene in the feed is increased. The amount of ethylene in the feed is up to 6 wt. % with a resulting amount of ethylene incorporated into the copolymer product up to 4 mole %.Type: GrantFiled: April 22, 1997Date of Patent: August 4, 1998Assignee: Fina Technology, Inc.Inventors: Edwar S. Shamshoum, David J. Rauscher, Theodore Harris, The Vu, Margarito Lopez
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Patent number: 5753785Abstract: A process of polymerizing ethylene with a catalyst using a single metallocene catalyst comprising a bridged metallocene compound having two cyclopentadienyl rings, one substituted with a bulky group in a distal position and one substituted such that a fused ring, substituted or unsubstituted, is formed, which produces a copolymer of ethylene. The metallocene catalyst promotes simultaneous oligomerization of a fraction of ethylene to form a comonomer in situ and copolymerization of the remaining ethylene and the comonomer to form a copolymer.Type: GrantFiled: December 16, 1996Date of Patent: May 19, 1998Assignee: Fina Technology, Inc.Inventors: Baireddy Raghava Reddy, Edwar S. Shamshoum, Margarito Lopez