Patents Represented by Attorney, Agent or Law Firm C. Paige Schmidt
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Patent number: 7319122Abstract: A blended polypropylene composition, fiber, and nonwoven articles made therefrom are provided. In one aspect, the blended polypropylene composition comprises a first polymer component having a molecular weight distribution of from 2.5 to 8, and a second polymer component having a molecular weight distribution of from 1.8 to 3. The first polymer component has a melt flow rate of greater than 30 g/10 min. and the second polymer component has a melt flow rate of less than 40 g/10 min., and the blended polypropylene composition has a melt flow rate of greater than 5 g/10 min.Type: GrantFiled: February 7, 2005Date of Patent: January 15, 2008Assignee: ExxonMobil Chemical Patents Inc.Inventors: Chia Yung Cheng, Galen Charles Richeson
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Patent number: 6884850Abstract: Propylene ethylene copolymers with an ethylene content between 8 and 32 mole % have been grafted with maleic anhydride and a peroxide. The functionality level is higher than what is reported with polypropylene.Type: GrantFiled: October 17, 2001Date of Patent: April 26, 2005Assignee: ExxonMobil Chemical Patents Inc.Inventors: Jean-Roch H. Schauder, Sudhin Datta
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Patent number: 6638887Abstract: Described are certain monocyclopentadienyl Group IV B metal compounds, catalyst systems comprising such monocyclopentadienyl metal compounds and an activator, and a process using such catalyst systems for the production of polyolefins, particularly high molecular weight ethylene-&agr;-olefin copolymers having a high level of &agr;-olefin incorporation.Type: GrantFiled: August 2, 2000Date of Patent: October 28, 2003Assignee: ExxonMobil Chemical Patents Inc.Inventor: Jo Ann Marie Canich
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Patent number: 6605560Abstract: This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The method for supporting the catalyst of the invention provides for a supported metallocene catalyst formed by vacuum or pressurized impregnation.Type: GrantFiled: March 13, 1997Date of Patent: August 12, 2003Assignee: Univation Technologies, LLCInventor: Main Chang
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Patent number: 6384142Abstract: This invention relates to propylene impact copolymer compositions. In particular, these unique and improved compositions can be produced using conventional, commercial-scale processes.Type: GrantFiled: March 24, 2000Date of Patent: May 7, 2002Assignee: ExxonMobil Chemical Patents Inc.Inventors: Terry John Burkhardt, Robert Tan Li, Aspy Keki Mehta, Udo M. Stehling, William T. Haygood, Jr., Francis C. Rix, Dawn C. Wiser
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Patent number: 6342566Abstract: This invention relates to propylene impact copolymer compositions. In particular, these unique and improved compositions can be produced using conventional, commercial-scale processes.Type: GrantFiled: May 21, 2001Date of Patent: January 29, 2002Assignee: ExxonMobil Chemical Patents Inc.Inventors: Terry John Burkhardt, Robert Tan Li, Aspy Keki Mehta, Udo M. Stehling, William T. Haygood, Jr., Francis C. Rix, Dawn C. Wiser
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Patent number: 6248833Abstract: This invention relates generally to novel fibers and fabrics. Specifically, these fibers are prepared using propylene impact copolymer compositions. Fabrics, particularly nonwoven fabrics, formed from these fibers exhibit improved elongation properties.Type: GrantFiled: February 29, 2000Date of Patent: June 19, 2001Assignee: Exxon Mobil Chemical Patents Inc.Inventors: Dina Marie Colucci, Chia Yung Cheng, William Michael Ferry, Don Allen Plank
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Patent number: 6228795Abstract: This invention relates to a catalyst system comprising a substituted, bridged bisindenyl metallocene supported on a polymeric support wherein the metallocene is activated for polymerization by an ionizing reaction and stabilized in cationic form with a noncoordinating anion. A protonated ammonium salt of a noncoordinating amine is covalently bonded to the support. Propylene polymers produced by these supported catalyst systems have melting points and polymer microstructures similar to propylene polymers produced using analogous unsupported catalyst systems.Type: GrantFiled: November 2, 1998Date of Patent: May 8, 2001Assignee: Exxon Chemical Patents, Inc.Inventor: James C. Vizzini
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Patent number: 6218010Abstract: The present invention relates to polypropylene copolymer alloys which are especially suited for soft fiber and fabric applications. These alloys comprise an ethylene-propylene random copolymer having an ethylene content of from about 1.0 to 5.0% by weight, in an amount of from about 40 to 90% by weight of the alloy; and an ethylene-propylene bipolymer having an ethylene content of from about 10 to 30% by weight, in an amount of from about 10 to 60% by weight of the alloy. The present invention further relates to fiber and fabric articles made from such alloys.Type: GrantFiled: May 3, 2000Date of Patent: April 17, 2001Assignee: ExxonMobil Chemical Patents Inc.Inventors: George Byron Georgellis, Chia Yung Cheng, William Moa-Tseng Chien
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Patent number: 6184170Abstract: This invention relates generally to metallocene catalyst systems and to methods for their production and use. Specifically, this invention relates to a method for preparing metallocene catalyst systems using olefin additives which promote catalyst activity.Type: GrantFiled: May 5, 2000Date of Patent: February 6, 2001Assignee: Exxon Chemical Patents, Inc.Inventor: Main Chang
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Patent number: 6180808Abstract: Stabilized alumoxane solutions are provided as well as a method for producing such solutions. The method generally involves the use of metallocene catalyst component(s) that when mixed with alumoxane solutions reduce the tendency for such solutions to form gels.Type: GrantFiled: June 27, 1997Date of Patent: January 30, 2001Assignee: Exxon Chemical Patents Inc.Inventors: Agapios Kyriacos Agapiou, Patrick Brant
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Patent number: 6136742Abstract: This invention relates to metallocene catalyst systems and to methods for their production and use. Specifically, this invention relates to catalyst promoters which increase the activity of the metallocene catalyst systems. The promoters can be, for example, styrene or substituted styrene in one embodiment. The metallocene catalyst systems can be used, for example, to make olefins. The catalyst systems of this invention can be supported.Type: GrantFiled: May 22, 1997Date of Patent: October 24, 2000Assignee: Exxon Chemical Patents, Inc.Inventor: Main Chang
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Patent number: 6090740Abstract: This invention relates generally to supported metallocene catalyst systems and to methods for their production which comprising combining inorganic porous support material having an average particle size of from about 30.mu. to about 40.mu., metallocene, and alumoxane wherein the amount of metallocene is in the range of 0.005 to 0.06 mmoles transition metal/g support material and the ratio of aluminum to transition metal is in the range of 10:1 to 300:1. Specifically, this invention relates to supported metallocene catalyst systems having improved metallocene loading and optionally reduced support particle size. These catalyst systems are particularly useful for the polymerization of ethylene polymers.Type: GrantFiled: January 23, 1997Date of Patent: July 18, 2000Assignee: Exxon Chemical Patents Inc.Inventors: Agapios K. Agapiou, Dwayne L. Litteer, Michael E. Muhle
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Patent number: 6087291Abstract: This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The method for supporting the catalyst system of the invention provides for a metallocene catalyst and alumoxane activator supported on a porous support using a total volume of catalyst solution that is less than that of which a slurry is formed. The metallocene and alumoxane aer mixed in solution, then the solution is added to a porous support in a volume between the total pore volume of the support and the volume at which a slurry forms. The solvent is then removed, leaving an activated supported metallocene.Type: GrantFiled: October 24, 1997Date of Patent: July 11, 2000Assignee: Exxon Chemical Patents, Inc.Inventors: Anthony Nicholas Speca, Jeffrey Lawrence Brinen, George Alan Vaughan, Patrick Brant, Terry John Burkhardt
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Patent number: 6010588Abstract: Novel fibers have been made of reactor grade isotactic poly-alpha-olefin wherein polypropylene is produced by single-site catalysis and has a melt flow rate of greater than zero to about 5,000, MWD in the range of about 1.0 to about 3.5.Type: GrantFiled: February 7, 1995Date of Patent: January 4, 2000Assignee: Exxon Chemical Patents Inc.Inventors: Glenn Allan Stahl, James John McAlpin
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Patent number: 5994482Abstract: The present invention relates to polypropylene alloys which are especially suited for soft fiber and fabric applications. An embodiment of these alloys comprise an ethylene-propylene random copolymer having an ethylene content of from about 1.0 to 5.0% by weight, in an amount of from about 40 to 90% by weight of the alloy; and an ethylene-propylene bipolymer having an ethylene content of from about 10 to 30% by weight, in an amount of from about 10 to 60% by weight of the alloy. The present invention further relates to a hybrid process for making these alloys.Type: GrantFiled: March 4, 1997Date of Patent: November 30, 1999Assignee: Exxon Chemical Patents, Inc.Inventors: George Byron Georgellis, Chia Yung Cheng, William Moa-Tseng Chien
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Patent number: 5741563Abstract: Shrink films prepared from metallocene catalyzed propylene homopolymers and copolymers are provided. The films exhibit a unique balance of properties as compared to known shrink films including higher stiffness, tensile strength and moisture barrier, lower extractables, improved shrinkage and increased shrink tension. In addition, the shrink behavior of the film can be substantially tailored by modifying the amount of comonomer present in the propylene polymer.Type: GrantFiled: July 30, 1996Date of Patent: April 21, 1998Assignee: Exxon Chemical Patents Inc.Inventors: Aspy Keki Mehta, Michael Chia-Chao Chen
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Patent number: 5736465Abstract: Novel fibers have been made from reactor grade isotactic poly-alpha-olefin wherein polypropylene is produced by single-site catalysis and has a melt flow rate of greater than zero to about 5,000, MWD in the range of about 1.0 to about 3.5.Type: GrantFiled: May 11, 1995Date of Patent: April 7, 1998Assignee: Exxon Chemical Patents Inc.Inventors: Glenn Allan Stahl, James John McAlpin
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Patent number: 5723560Abstract: An amorphous polypropylene having a high weight average molecular weight prepared by a process in the presence of a catalyst comprising titanium-containing monocyclopentadienyl metallocene and aluminoxane.Type: GrantFiled: June 7, 1995Date of Patent: March 3, 1998Assignee: Exxon Chemical Patents Inc.Inventor: Jo Ann Marie Canich
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Patent number: 5723217Abstract: Novel fibers have been made from reactor grade isotactic poly-alpha-olefin wherein polypropylene is produced by single-site catalysis and has a melt flow rate of greater than zero to about 5,000, MWD in the range of about 1.0 to about 3.5.Type: GrantFiled: May 11, 1995Date of Patent: March 3, 1998Assignee: Exxon Chemical Patents Inc.Inventors: Glenn Allan Stahl, James John McAlpin