Patents by Inventor Srivatsan Srinivas
Srivatsan Srinivas 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: 8709560Abstract: Polymeric compositions and methods of making and using such compositions are provided. The compositions incorporate a first polymeric component that is at least one high density polyethylene and a second polymeric component that is at least one polymer including propylene-derived units having a heat of fusion of less than 75 J/g wherein the propylene-derived units have an isotactic triad fraction of about 65% to about 99%. The polymeric compositions are found to have desirable environmental stress crack resistance properties and impact resistance properties. The polymeric compositions are useful in a variety of applications such as molded containers and extruded pipes.Type: GrantFiled: September 16, 2005Date of Patent: April 29, 2014Assignee: ExxonMobil Chemical Patents Inc.Inventors: Srivatsan Srinivas Iyer, Thomas Michael Miller
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Patent number: 8071681Abstract: Polymeric compositions and methods of making and using such compositions are provided. The compositions incorporate at least one component that is a polymer including propylene-derived units and at least one component that is a styrenic block copolymer. The polymeric compositions are found to have desirable elastomeric properties while at the same time exhibiting beneficial processability characteristics. The unique combination of processability and performance attributes result in the polymeric compositions useful in a variety of applications such as films, fibers, woven and non-woven fabrics, sheets, molded objects, extruded forms, thermoformed objects, and all products made from such application materials.Type: GrantFiled: July 20, 2005Date of Patent: December 6, 2011Assignee: ExxonMobil Chemical Patents Inc.Inventors: Srivatsan Srinivas Iyer, Sudhin Datta, Trazollah Ouhadi
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Patent number: 8013069Abstract: Blends of at least two polymers incorporating propylene-derived units and processes for producing such blends are provided. The first polymer of the blend is a low crystallinity polymer including propylene-derived units. The second polymer is a high crystallinity polymer including propylene-derived units. The polymer blends exhibit the beneficial performance characteristics of low crystallinity propylene polymers while minimizing certain processing and handling problems associated with low crystallinity propylene polymers. Low crystallinity propylene polymer pellets often exhibit a tendency to agglomerate because of the softness of such particles. Agglomeration of the pellets creates problems in handling and processing the particles. The polymer blends disclosed reduce the tendency of polymer pellets to agglomerate while maintaining the desirable physical properties, such as elastomeric properties, exhibited by low crystallinity propylene polymers.Type: GrantFiled: January 13, 2006Date of Patent: September 6, 2011Assignee: Exxonmobil Chemical Patents Inc.Inventors: Bruce Allan Harrington, Michael Glenn Williams, Sudhin Datta, Srivatsan Srinivas Iyer
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Patent number: 8013093Abstract: The present invention is directed generally to the use of propylene-based elastomers in articles. The propylene-based elastomers have isotactic polypropylene crystallinity, a melting point by DSC of 110° C. or less, a heat of fusion of from 5 to 50 J/g, and comprise at least 75 wt % propylene-derived units, at least 6 wt % ethylene-derived units, and optionally diene-derived units. The present invention is also directed to processes for making articles comprising propylene-based elastomers.Type: GrantFiled: November 12, 2004Date of Patent: September 6, 2011Assignee: ExxonMobil Chemical Patents Inc.Inventors: Sudhin Datta, Chia Yung Cheng, Srivatsan Srinivas, Abdelhadi Sahnoune
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Patent number: 7781530Abstract: Polymeric compositions and methods of making and using such compositions are provided. The compositions incorporate a first component that is an isobutylene-based polymer and a second component having propylene-derived units and polyene derived units. The polymeric compositions have desirable processability characteristics, particularly for injection molding applications.Type: GrantFiled: January 13, 2006Date of Patent: August 24, 2010Assignee: ExxonMobil Chemical Patents Inc.Inventors: Hsien-Chang Wang, Wai Keung Wong, Srivatsan Srinivas Iyer, Pascal Van Hoeck
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Patent number: 7683129Abstract: This invention relates to a film comprising a heterogeneous blend of: 1) from 60 to 99 wt % of one or more semi-crystalline polymers; and 2) from 1 to 40 wt % of one or more semi-amorphous polymers; where the blend has: an MFR of 0.5 to 100 dg/min, a haze of 20% or less, and a permanent set of greater than 65%; and where the film is 2.5 to 635 microns thick and has: a haze of 10% or less, a 1° Secant tensile modulus of 100,000 to 30,000 psi, an Elmendorf tear in the machine direction and transverse direction of 45 g/mil or more, a total energy impact of 3 J or more; and a 45 degree gloss of 82 or more.Type: GrantFiled: December 9, 2005Date of Patent: March 23, 2010Assignee: ExxonMobil Chemical Patents Inc.Inventors: Aspy K. Mehta, Sudhin Datta, Wen Li, Srivatsan Srinivas Iyer
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Patent number: 7655317Abstract: The invention concerns films having a cling layer of an elastomeric propylene-based polymer with a low heat of fusion derived from isotactic propylene type crystallinity, as determined by DSC of less than 40 J/g, optionally blended with a crystalline isotactic propylene derived polymer having a heat of fusion over 70 J/g and/or a melting point of at least 120° C. as determined by DSC, and a non-cling layer of a polyolefin. The cling layer may contain other components such as crystalline polypropylene.Type: GrantFiled: January 19, 2005Date of Patent: February 2, 2010Assignee: ExxonMobil Chemical Patents Inc.Inventors: Patrick Brant, Srivatsan Srinivas, Paul Masten German
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Patent number: 7629416Abstract: The present invention relates to a composition comprising 1) from 1 to 98 weight % of a first propylene polymer having a melting point of 100° C. or more, 2) from 5 to 98 weight % of a second propylene polymer having a heat of fusion of 70 J/g or less and a tacticity index of 75% or more, 3) from 0.5 to 75 weight % of a non-functionalized plasticizer (“NFP”) having a viscosity index of 120 or more, based upon the weight of the first polymer, second polymer, and the NFP, and articles therefrom.Type: GrantFiled: April 29, 2005Date of Patent: December 8, 2009Assignee: ExxonMobil Chemical Patents Inc.Inventors: Wen Li, Mun Fu Tse, Srivatsan Srinivas Iyer, Bryan Robert Chapman
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Publication number: 20090197029Abstract: Polymeric compositions and methods of making and using such compositions are provided. The compositions incorporate a first polymeric component that is at least one high density polyethylene and a second polymeric component that is at least one polymer including propylene-derived units having a heat of fusion of less than 75 J/g wherein the propylene-derived units have an isotactic triad fraction of about 65% to about 99%. The polymeric compositions are found to have desirable environmental stress crack resistance properties and impact resistance properties. The polymeric compositions are useful in a variety of applications such as molded containers and extruded pipes.Type: ApplicationFiled: September 16, 2005Publication date: August 6, 2009Inventors: Srivatsan Srinivas Iyer, Thomas Michael Miller
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Patent number: 7413811Abstract: Two-component polymer composite structures are described, such as a composite structure that includes a first polymer structure and a second polymer structure adhered to one another through interfacial adhesion provided by a semicrystalline random copolymer with 70-88 mole % propylene units and alpha olefin units having 2 or from 4 to 10 carbon atoms, the semicrystalline random copolymer having a heat of fusion of from 2 to 90 J/g and a crystallinity of from 2% to 65% of the crystallinity of isotatic polypropylene.Type: GrantFiled: February 4, 2005Date of Patent: August 19, 2008Assignee: ExxonMobil Chemical Patents Inc.Inventors: Narayanaswami Raja Dharmarajan, Sudhin Datta, Michael C. Bulawa, Srivatsan Srinivas, Thomas J. Reynolds
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Patent number: 7390866Abstract: The present invention provides curable and cured propylene-based elastomers, optionally including a diene, and having isotactic polypropylene crystallinity, a melting point by DSC equal to or less than 110° C., and a heat of fusion of from 5 J/g to 50 J/g. The present invention also provides blend compositions comprising any of the propylene-based elastomers described herein. The present invention also provides compositions comprising any of the propylene-based elastomers described herein and 1 to 100 parts by weight of inorganic filler per 100 parts of polymer. The present invention also provides films, fibers, fabrics, molded objects, and extruded forms which include any of the inventive compositions described herein.Type: GrantFiled: November 12, 2004Date of Patent: June 24, 2008Assignee: ExxonMobil Chemical Patents Inc.Inventors: Sudhin Datta, Rul Zhao, Srivatsan Srinivas, Majia Y Amin, Periagaram S Ravishankar
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Patent number: 7265193Abstract: This invention relates to a process to polymerize olefins comprising: contacting: (i) propylene and (ii) a mixture comprising, optionally ethylene, and three or more different alpha olefins having 4 to 20 carbon atoms, wherein at least one alpha olefin is present at Z percent or more, based upon the weight of the mixture, where Z=Y+X, where X=(100 divided by the number of alpha olefins present in the mixture) and Y equals 1 to 75, where Z is not more than 95%, with (iii) a metallocene catalyst system.Type: GrantFiled: January 13, 2004Date of Patent: September 4, 2007Assignee: ExxonMobil Chemical Patents Inc.Inventors: Weiqing Weng, Srivatsan Srinivas, Robert J. Wittenbrink
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Patent number: 7105603Abstract: Disclosed herein are various compositions that have particular utility in automotive components, including compositions that include: (a) polypropylene having a melting point of 110° C. or more; (b) ethylene ?-olefin polymer in which the ?-olefin is C4 or higher; and (c) propylene polymer, having 60 wt % or more units derived from propylene, including isotactically arranged propylene derived sequences and a heat of fusion less than 45 J/g.Type: GrantFiled: July 21, 2004Date of Patent: September 12, 2006Assignee: ExxonMobil Chemical Patents Inc.Inventors: Narayanaswami Raja Dharmarajan, Michael Glenn Williams, Sudhin Datta, Prasadarao Meka, Srivatsan Srinivas
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Publication number: 20060159943Abstract: The invention concerns films having a cling layer of an elastomeric propylene-based polymer with a low heat of fusion derived from isotactic propylene type crystallinity, as determined by DSC of less than 40 J/g, optionally blended with a crystalline isotactic propylene derived polymer having a heat of fusion over 70 J/g and/or a melting point of at least 120° C. as determined by DSC, and a non-cling layer of a polyolefin. The cling layer may contain other components such as crystalline polypropylene.Type: ApplicationFiled: January 19, 2005Publication date: July 20, 2006Inventors: Patrick Brant, Srivatsan Srinivas, Paul German
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Publication number: 20050137368Abstract: Disclosed herein is a copolymer comprising the polymerization product of propylene and a branched olefin, the copolymer comprising about 80 to about 99.9 wt % propylene; about 0.1 to about 20 wt % branched olefin; and the copolymer having a weight average molecular weigh of about 80,000 to about 800,000 Daltons, wherein a weight average molecular weight of the copolymer after being irradiated at a dosage of at least about 5 kGy is greater than or equal to about 90% the weight average molecular weight of the copolymer prior to being irradiated. Uses of the copolymer and a process of making the copolymer are also disclosed.Type: ApplicationFiled: December 17, 2003Publication date: June 23, 2005Inventors: Weqing Weng, Srivatsan Srinivas, Anthony Karandinos
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Publication number: 20050130544Abstract: Articles and nonwoven fabrics having improved elasticity manufactured from compositions, for example, made from 5 wt % to 100 wt % of a first polymer component of polymers selected from homopolymers of propylene and random copolymers of propylene and from 95 wt % to 0 wt % of a second polymer component of polymers selected from propylene homopolymers and propylene copolymers.Type: ApplicationFiled: October 20, 2004Publication date: June 16, 2005Inventors: Chia Cheng, Srivatsan Srinivas, Sudhin Datta
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Publication number: 20050131152Abstract: Two-component polymer composite structures are described, such as a composite structure that includes a first polymer structure and a second polymer structure adhered to one another through interfacial adhesion provided by a semicrystalline random copolymer with 70-88 mole % propylene units and alpha olefin units having 2 or from 4 to 10 carbon atoms, the semicrystalline random copolymer having a heat of fusion of from 2 to 90 J/g and a crystallinity of from 2% to 65% of the crystallinity of isotatic polypropylene.Type: ApplicationFiled: February 4, 2005Publication date: June 16, 2005Inventors: Narayanaswami Dharmarajan, Sudhin Datta, Michael Bulawa, Srivatsan Srinivas, Thomas Reynolds
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Publication number: 20050106978Abstract: Articles and nonwoven fabrics having improved elasticity manufactured from compositions, for example, made from 5 wt % to 100 wt % of a first polymer component of polymers selected from homopolymers of propylene and random copolymers of propylene and from 95 wt % to 0 wt % of a second polymer component of polymers selected from propylene homopolymers and propylene copolymers.Type: ApplicationFiled: November 18, 2003Publication date: May 19, 2005Inventors: Chia Cheng, Srivatsan Srinivas, Sudhin Datta
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Publication number: 20050107529Abstract: The present invention is directed generally to the use of propylene-based elastomers in articles. The propylene-based elastomers have isotactic polypropylene crystallinity, a melting point by DSC of 110° C. or less, a heat of fusion of from 5 to 50 J/g, and comprise at least 75 wt % propylene-derived units, at least 6 wt % ethylene-derived units, and optionally diene-derived units. The present invention is also directed to processes for making articles comprising propylene-based elastomers.Type: ApplicationFiled: November 12, 2004Publication date: May 19, 2005Inventors: Sudhin Datta, Chia Cheng, Srivatsan Srinivas, Abdelhadi Sahnoune
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Publication number: 20050107534Abstract: The present invention provides curable and cured propylene-based elastomers, optionally including a diene, and having isotactic polypropylene crystallinity, a melting point by DSC equal to or less than 110° C., and a heat of fusion of from 5 J/g to 50 J/g. The present invention also provides blend compositions comprising any of the propylene-based elastomers described herein. The present invention also provides compositions comprising any of the propylene-based elastomers described herein and 1 to 100 parts by weight of inorganic filler per 100 parts of polymer. The present invention also provides films, fibers, fabrics, molded objects, and extruded forms which include any of the inventive compositions described herein.Type: ApplicationFiled: November 12, 2004Publication date: May 19, 2005Inventors: Sudhin Datta, Rul Zhao, Srivatsan Srinivas, Majia Amin, Periagaram Ravishankar