Patents by Inventor Venki Chandrashekar
Venki Chandrashekar 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: 7855255Abstract: Disclosed is a polyethylene composition. The composition comprises single-site multimodal resin A and single-site multimodal resin B, wherein resin A differs from resin B in molecular weight, in monomeric composition, in density, in long chain branch concentration or distribution, or in combinations thereof. Disclosed is also a method for making the polyethylene composition. The method comprises polymerizing, in the presence of two or more single-site catalysts, ethylene or its mixture with a C3-C10 ?-olefin to form a first multimodal resin and continuing the polymerization in the presence of the same catalysts but in a different hydrogen concentration, in a different monomer composition, or at a different temperature to form a second multimodal resin.Type: GrantFiled: December 4, 2008Date of Patent: December 21, 2010Assignee: Equistar Chemicals, LPInventors: Venki Chandrashekar, Mark P. Mack, Charles H. Gates, Jr., Charles S. Holland, Natalia Nagy, Sandor M. Nagy, Edward S. Vargas, Jean A. Merrick-Mack
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Publication number: 20090099316Abstract: Disclosed is a polyethylene composition. The composition comprises single-site multimodal resin A and single-site multimodal resin B, wherein resin A differs from resin B in molecular weight, in monomeric composition, in density, in long chain branch concentration or distribution, or in combinations thereof. Disclosed is also a method for making the polyethylene composition. The method comprises polymerizing, in the presence of two or more single-site catalysts, ethylene or its mixture with a C3-C10 ?-olefin to form a first multimodal resin and continuing the polymerization in the presence of the same catalysts but in a different hydrogen concentration, in a different monomer composition, or at a different temperature to form a second multimodal resin.Type: ApplicationFiled: December 4, 2008Publication date: April 16, 2009Inventors: Venki Chandrashekar, Mark P. Mack, Charles H. Gates, JR., Charles S. Holland, Natalia Nagy, Sandor M. Nagy, Edward S. Vargas, Jean A. Merrick-Mack
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Patent number: 7473745Abstract: Disclosed is a polyethylene composition. The composition comprises single-site multimodal resin A and single-site multimodal resin B, wherein resin A differs from resin B in molecular weight, in monomeric composition, in density, in long chain branch concentration or distribution, or in combinations thereof. Disclosed is also a method for making the polyethylene composition. The method comprises polymerizing, in the presence of two or more single-site catalysts, ethylene or its mixture with a C3-C10 ?-olefin to form a first multimodal resin and continuing the polymerization in the presence of the same catalysts but in a different hydrogen concentration, in a different monomer composition, or at a different temperature to form a second multimodal resin.Type: GrantFiled: September 2, 2005Date of Patent: January 6, 2009Assignee: Equistar Chemicals, LPInventors: Venki Chandrashekar, Mark P. Mack, Charles H. Gates, Jr., Charles S. Holland, Natalia Nagy, Sandor M. Nagy, Edward S. Vargas, Jean A. Merrick-Mack
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Publication number: 20070055021Abstract: Disclosed is a polyethylene composition. The composition comprises single-site multimodal resin A and single-site multimodal resin B, wherein resin A differs from resin B in molecular weight, in monomeric composition, in density, in long chain branch concentration or distribution, or in combinations thereof. Disclosed is also a method for making the polyethylene composition. The method comprises polymerizing, in the presence of two or more single-site catalysts, ethylene or its mixture with a C3-C10 ?-olefin to form a first multimodal resin and continuing the polymerization in the presence of the same catalysts but in a different hydrogen concentration, in a different monomer composition, or at a different temperature to form a second multimodal resin.Type: ApplicationFiled: September 2, 2005Publication date: March 8, 2007Inventors: Venki Chandrashekar, Mark Mack, Charles Gates, Charles Holland, Natalia Nagy, Sandor Nagy, Edward Vargas, Jean Merrick-Mack
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Patent number: 7175918Abstract: The present invention relates to polyolefin compositions that incorporate an acrylic/polyether comb-branched copolymer, articles made from the compositions, such as polyolefin films and polyolefin fibers, and methods for making the compositions and the articles.Type: GrantFiled: April 27, 2004Date of Patent: February 13, 2007Assignees: Equistar Chemicals, LP, Lyondell Chemical Technology, L.P.Inventors: Anil W. Saraf, Steven A. Schwartz, Edward T. Shawl, Michael Bridges, Venki Chandrashekar
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Patent number: 7037970Abstract: Ethylene polymer composites, concentrates and a process utilized for their preparation are provided. The composites of the invention have increased melt strength compared to the base resin and other improved physical characteristics. The composites contain an organically modified clay and may also contain a compatibilizng agent, depending on the base resin used.Type: GrantFiled: May 26, 2004Date of Patent: May 2, 2006Assignee: Equistar Chemicals, LPInventors: Sameer D. Mehta, Harilaos Mavridis, Venki Chandrashekar, Edward S. Vargas
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Publication number: 20050256243Abstract: Ethylene polymer composites, concentrates and a process utilized for their preparation are provided. The composites of the invention have increased melt strength compared to the base resin and other improved physical characteristics. The composites contain an organically modified clay and may also contain a compatibilizng agent, depending on the base resin used.Type: ApplicationFiled: May 26, 2004Publication date: November 17, 2005Inventors: Sameer Mehta, Harilaos Mavridis, Venki Chandrashekar, Edward Vargas
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Publication number: 20050239961Abstract: The present invention relates to polyolefin compositions that incorporate an acrylic/polyether comb-branched copolymer, articles made from the compositions, such as polyolefin films and polyolefin fibers, and methods for making the compositions and the articles.Type: ApplicationFiled: April 27, 2004Publication date: October 27, 2005Inventors: Anil Saraf, Steven Schwartz, Edward Shawl, Michael Bridges, Venki Chandrashekar
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Patent number: 6844389Abstract: Ethylene polymer composites and concentrates utilized for their preparation are provided. The composites of the invention have increased melt strength compared to the base resin and other improved physical characteristics. The composites contain an organically modified clay and may also contain a compatibilizng agent, depending on the base resin used.Type: GrantFiled: December 20, 2001Date of Patent: January 18, 2005Assignee: Equistar Chemicals, LPInventors: Sameer D. Mehta, Harilaos Mavridis, Venki Chandrashekar, Edward S. Vargas
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Patent number: 6602966Abstract: A process is provided for producing ethylene (co)polymer nanocomposites in a high pressure polymerization reactor. The process by which nanocomposites having organically modified clays incorporated and intimately dispersed therein involves polymerizing ethylene and one or more optional comonomers under high pressure polymerization conditions in the presence of an organic peroxide initiator and organically modified clay.Type: GrantFiled: July 11, 2002Date of Patent: August 5, 2003Assignee: Equistar Chemicals, LPInventors: Edward S. Vargas, Michael W. Lynch, Michael J. Ruda, Venki Chandrashekar
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Publication number: 20030130399Abstract: Ethylene polymer composites and concentrates utilized for their preparation are provided. The composites of the invention have increased melt strength compared to the base resin and other improved physical characteristics. The composites contain an organically modified clay and may also contain a compatibilizng agent, depending on the base resin used.Type: ApplicationFiled: December 20, 2001Publication date: July 10, 2003Inventors: Sameer D. Mehta, Harilaos Mavridis, Venki Chandrashekar, Edward S. Vargas
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Patent number: 6562081Abstract: Disperse dyed polyethylene fibers obtained by either melt spinning or flash spinning and materials produced from said fibers are provided. The process utilizes dye blends containing at least three and, more preferably, four or more disperse dyes selected from a primary color group. The individual dyes are utilized at a concentration of at lest 75% but less than 100% of the determined maximum concentration which produces crocking. HDPE and LLDPE materials are effectively dyed using disperse dye blends formulated by the invention.Type: GrantFiled: March 27, 2001Date of Patent: May 13, 2003Assignee: Equistar Chemicals, LPInventors: Anil W. Saraf, Michael Bridges, Venki Chandrashekar
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Publication number: 20030019054Abstract: Disperse dyed polyethylene fibers obtained by either melt spinning or flash spinning and materials produced from said fibers are provided. The process utilizes dye blends containing at least three and, more preferably, four or more disperse dyes selected from a primary color group. The individual dyes are utilized at a concentration of at lest 75% but less than 100% of the determined maximum concentration which produces crocking. HDPE and LLDPE materials are effectively dyed using disperse dye blends formulated by the invention.Type: ApplicationFiled: March 27, 2001Publication date: January 30, 2003Inventors: Anil W. Saraf, Michael Bridges, Venki Chandrashekar
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Patent number: 6355733Abstract: A blend comprising a high molecular weight, medium density polyethylene (HMW, MDPE) and a linear low density polyethylene (LLDPE) is disclosed. The blend comprises from about 20 wt % to about 80 wt % of HMW MDPE. The HMW MDPE has a density from about 0.92 to about 0.944 g/cc, a melt index MI2 from about 0.01 to about 0.5 dg/min, and a melt flow ratio MFR from about 50 to about 300. The blend also comprises about 20 wt % to about 80 wt % of LLDPE. The LLDPE has a density within the range of about 0.90 to about 0.925 g/cc and an MI2 within the range of about 0.50 to about 50 dg/min. The blend provides films with significantly improved toughness and tear strength compared to MDPE or HDPE, and high modulus compared to LLDPE.Type: GrantFiled: October 13, 2000Date of Patent: March 12, 2002Assignee: Equistar Chemicals, LPInventors: Kelly L. Williams, Leonard V. Cribbs, Stephen M. Imfeld, Venki Chandrashekar