Patents by Inventor Peijun Jiang

Peijun Jiang 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).

  • Lubricating oil compositions and method for making them
    Patent number: 9416206
    Abstract: Provided are ethylene propylene copolymers compositions thereof and methods for making the same. The composition may include an ethylene copolymer, comprising 40 wt % to 70 wt % of units derived from ethylene, and at least 30 wt % of units derived from at least one ?-olefin having 3 to 20 carbon atoms. The composition can have a melting point (Tm) in ° C., as measured by DSC, that satisfies the relation: Tm>3.4×E?180, where E is the weight % of units derived from ethylene in the copolymer. The composition can also have a Mw/Mn ratio of about 1.5 to about 3.5. The composition can further have a content of Group 4 metals derived from a catalyst of 25 ppm or less.
    Type: Grant
    Filed: January 12, 2011
    Date of Patent: August 16, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Rainer Kolb, Liehpao Oscar Farng, Sudhin Datta, Donna J. Crowther, Peijun Jiang
  • Low viscosity poly-alpha-olefins
    Patent number: 9409834
    Abstract: A low viscosity poly(apha-olefin) (PAO) is produced by contacting one or more C3 to C24 alpha-olefins with an unbridged, substituted bis cyclopentadienyl transition metal compound, a non-coordinating anion activator, and an alkyl-aluminum compound. The molar ratio of transition metal compound to activator is 10:1 to 0.1:1, and the molar ratio of alkyl aluminum compound to transition metal compound is 1:4 to 4000:1. The transition metal compound has either (a) at least one non-isoolefin substitution on both cyclopentadienyl rings, or (b) at least two substitutions on at least one cyclopentadienyl ring. The PAO is comprised of at least 50 mole % of C3 to C24 alpha-olefins and has a kinematic viscosity at 100° C. of 20 cSt or less.
    Type: Grant
    Filed: May 21, 2012
    Date of Patent: August 9, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Margaret May-Som Wu, Catalina L. Coker, John F. Walzer, Jr., Peijun Jiang
  • Production of shear-stable high viscosity PAO
    Patent number: 9365663
    Abstract: The invention is directed to a process for the preparation of high viscosity lubricant base stocks by contacting alphaolefin feedstocks with single-site metallocene catalysts in a mixed flow or continuous stirred tank reactors.
    Type: Grant
    Filed: February 19, 2009
    Date of Patent: June 14, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Mark Paul Hagemeister, Peijun Jiang, Margaret M. Wu, Norman Yang
  • Modified polyethylene compositions for blown film
    Patent number: 9340664
    Abstract: The present invention relates to a blown film comprising more than 25 wt % (based on the weight of the composition) of one or more linear ethylene polymers having a g?vis of 0.97 or more and an Mw of 20,000 g/mol or more and at least 0.1 wt % of a branched modifier where the modifier has a) a g?vis of 0.90 or less; b) an Mw of 100,000 g/mol or more; c) an Mw/Mn of 3.0 or more; d) an Mz/Mn of 7.0 or more; e) optionally, an Mz of 2,000,000 g/mol or less; and f) a shear thinning ratio of 40 or more.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: May 17, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Pradeep P. Shirodkar, Jianya Cheng, Peijun Jiang
  • Modified polyethylene compositions for cast film
    Patent number: 9321911
    Abstract: The present invention relates to a cast film comprising a composition comprising more than 25 wt % (based on the weight of the composition) of one or more linear ethylene polymers having a g?vis of 0.97 or more and an Mw of 20,000 g/mol or more and at least 0.1 wt % of a branched modifier where the modifier has a) a g?vis of 0.90 or less; b) an Mw of 100,000 g/mol or more; c) an Mw/Mn of 3.0 or more; d) an Mz/Mn of 7.0 or more; e) a shear thinning ratio of 40 or more; and f) an I21 of 20 dg/min or less; where the film has at least a 10% reduction in neck-in as compared to the same composition formed into a film under the same conditions, except that the branched modifier is absent.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: April 26, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Pradeep P. Shirodkar, Jianya Cheng, Peijun Jiang, Arturo Leyva, Steven A. Best
  • Process for controlling molecular weight of polyolefins prepared using pyridyl diamide catalyst systems
    Patent number: 9102773
    Abstract: Pyridyldiamido transition metal complexes are disclosed for use in alkene polymerization to produce polyolefins.
    Type: Grant
    Filed: January 20, 2014
    Date of Patent: August 11, 2015
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: John R. Hagadorn, Matthew S. Bedoya, Peijun Jiang
  • Polymerization process for production of polymer
    Patent number: 9096700
    Abstract: A process comprising contacting a catalyst system with one or more olefins in a bubble column reactor. Also, a polyolefin copolymer composition comprising ethylene, propylene and optionally a C4 to C20 alpha olefin; said composition having a bimodal distribution with respect to composition distribution, molecular weight distribution or a combination thereof; an Mw of 10,000 g/mol or more; and/or at least two melting peaks in a DSC heating cycle with a difference in melting temperatures of at least 5° C.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: August 4, 2015
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Peijun Jiang, Keith E. Jolibois, Ronald R. Thackston
  • In-reactor polymer blends
    Patent number: 9068034
    Abstract: This invention relates to in-reactor polymer blends comprising at least 60 mole % of propylene and from 0.01 to 10 mole % of at least one diene selected from the group of C6 to C12 ?,?-diene, norbornadiene, vinyl norbornene and mixtures thereof with the balance being ethylene. The blend comprises first and second polymers having different crystallinities and or different Tg's.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: June 30, 2015
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Kevin R. Squire, Charles J. Ruff, Cesar A. Garcia-Franco, Peijun Jiang
  • Propylene copolymers for adhesive applications
    Patent number: 9051404
    Abstract: Disclosed herein is an in-reactor produced multi-component copolymer comprises a semi-crystalline component having a crystallinity of 20% or more, and an amorphous component having a crystallinity of 5% or less. The copolymer comprises at least 80 wt % of units derived from propylene and from about 1 to about 20 wt % of units derived from at least one C6 to C12 alpha-olefin. The copolymer has a viscosity at 190° C. of at least 530 mPa sec and a heat of fusion between about 10 and about 70 J/g. An adhesive containing the copolymer exhibits a good balance of adhesive properties and mechanical strength.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: June 9, 2015
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Peijun Jiang, Patrick Brant, David Aaron Henning, David Raymond Johnsrud, Charles Lewis Sims
  • Crack-Resistant Polyethylene Compositions
    Publication number: 20150125645
    Abstract: A crack-resistant article comprising a diene terpolymer, the diene terpolymer comprising (or consisting essentially of) from 0.01 wt % to 10.0 wt % diene derived units, and 1.0 wt % to 20 wt % of C4 to C10 ?-olefin derived units based on the weight of the diene terpolymer, wherein the diene terpolymer: a) has a g?vis of less than 0.90; b) has an Mw within a range of from 100,000 g/mol to 500,000 g/mol; c) has an Mw/Mn within the range of from 3.5 to 12.0; and d) an Mz/Mn of greater than 7.0. Inventive articles comprise a blend of a relatively high density linear polyethylene and the diene terpolymer.
    Type: Application
    Filed: January 14, 2015
    Publication date: May 7, 2015
    Inventors: Jianya Cheng, Pradeep P. Shirodkar, Peijun Jiang, Andrew Takacs
  • Foamed Polyethylene Compositions
    Publication number: 20150126634
    Abstract: A foamable or foamed article comprising a diene terpolymer, the diene terpolymer comprising (or consisting essentially of) from 0.01 wt % to 10.0 wt % diene derived units, and 1.0 wt % to 20 wt % of C4 to C10 ?-olefin derived units based on the weight of the diene terpolymer, wherein the diene terpolymer: a) has a g?vis of less than 0.90; b) has an Mw within a range of from 100,000 g/mol to 500,000 g/mol; c) has an Mw/Mn within the range of from 3.5 to 12.0; and d) an Mz/Mn of greater than 7.0. Inventive articles comprise a blend of a relatively high density linear polyethylene and the diene terpolymer.
    Type: Application
    Filed: January 14, 2015
    Publication date: May 7, 2015
    Inventors: Pradeep P. Shirodkar, Jianya Cheng, Joseph M. Tomei, Peijun Jiang, Arturo Leyva
  • Blocky ethylene propylene copolymers and methods for making them
    Patent number: 9012578
    Abstract: Copolymers comprising ethylene and propylene and methods for producing such polymers are provided. The polymers are blocky copolymers having semicrystalline ethylene sequences and amorphous or low crystallinity propylene sequences. The polymers are preferably prepared using metallocene-based catalyst systems but without the use of a chain shuttling agent. The polymers may have higher melting temperatures than previously known random copolymers or blocky copolymers prepared with chain shuttling agents having similar comonomer contents. The polymers include both ethylene-rich and propylene-rich copolymers.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: April 21, 2015
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Rainer Kolb, Donna J. Crowther, Peijun Jiang
  • Branched vinyl terminated polymers and methods for production thereof
    Patent number: 8981029
    Abstract: This invention relates to a process for polymerization, comprising (i) contacting, at a temperature greater than 35° C., one or more monomers comprising ethylene and/or propylene, with a catalyst system comprising a metallocene catalyst compound and an activator, (ii) converting at least 50 mol % of the monomer to polyolefin; and (iii) obtaining a branched polyolefin having greater than 50% allyl chain ends, relative to total unsaturated chain ends. The invention also relates to the branched polyolefins and functionalized branched polyolefins.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: March 17, 2015
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Peijun Jiang, Patrick Brant
  • Multiple catalyst system for olefin polymerization and polymers produced therefrom
    Patent number: 8957159
    Abstract: This invention relates to an adhesive comprising an olefin polymer composition comprising a first amorphous polymer having a crystallinity of 5% or less, prepared with a first catalyst; and a second crystalline polymer, differing in chemical and physical properties from the first polymer, having a crystallinity of 20% or more, prepared with a second catalyst; and where the olefin polymer composition has a Dot T-Peel of 1 Newton or more on Kraft paper; an Mw of at least 7,000 to 80,000; a branching index (g?) of from 0.4 to 0.90 measured at the Mz of the polymer composition; and a crystallinity of between 5 and 40%.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: February 17, 2015
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Peijun Jiang, Armenag Hagop Dekmezian, Jo Ann Marie Canich, Charles Lewis Sims, Ramin Abhari, Cesar Alberto Garcia-Franco, David Raymond Johnsrud
  • Process Using Substituted Metallocene Catalysts and Products Therefrom
    Publication number: 20150025210
    Abstract: This invention relates to a process to produce propylene polymer using a bridged hafnium transition metal metallocene catalyst compounds having two indenyl ligands substituted at the 4 positions with a C1 to C10 alkyl, where the 3 positions are hydrogen (assuming the bridge position is counted as the one position) and the bridging atom is carbon or silicon which is incorporated into a cyclic group comprising 3, 4, 5, or 6 silicon and/or carbon atoms that make up the cyclic ring, where the propylene polymer has 1) greater than 40% vinyl chain ends, relative to the total unsaturated chain ends, 2) a Tm of 70° C. or more; an Mw of 3000 to 300,000 g/mol, and 4) a g?vis of 0.90 or less.
    Type: Application
    Filed: July 8, 2014
    Publication date: January 22, 2015
    Inventors: Jo Ann M. Canich, Peijun Jiang
  • Processes to Produce Polyalpha-Olefin Compositions
    Publication number: 20140378720
    Abstract: A process to produce polyalpha-olefins includes contacting a feed stream of at least one alpha-olefin monomer having 4 to 25 carbon atoms with a metallocene catalyst compound and an activator, and optionally an alkyl-aluminum compound, under polymerizations conditions in a reactor. The alpha-olefin monomer is present at 10% volume or more in the reactor and the feed stream includes less than 600 ppm of heteroatom containing compounds. The process further includes obtaining a polyalpha-olefin with at least 50 mole % C5 to C24 alpha-olefin monomer and kinematic viscosity at 100° C. of 5000 cSt or less.
    Type: Application
    Filed: May 6, 2014
    Publication date: December 25, 2014
    Inventors: Margaret M. Wu, Norman Yang, Lisa S. Baugh, Jo Ann M. Canich, Steven P. Rucker, John F. Walzer, JR., Gordon H. Lee, Frederick Y. Lo, Andrew Jackson, Mark P. Hagemeister, Shakeel Tirmizi, Peijun Jiang, Chia S. Chee
  • Heterogeneous In-Situ Polymer Blend
    Publication number: 20140309359
    Abstract: A heterogeneous in-situ polymer blend comprising a continuous phase comprising a polypropylene having a crystallinity of at least 30% and a melting point temperature Tm greater than 130° C., and a heat of fusion ?Hf greater than 65 J/g; and a dispersed phase comprising particles of an elastomeric copolymer dispersed in the continuous phase and having an average particle size of less than 5 micron, the elastomeric copolymer comprising ethylene units and 0.001 to 5 wt % diene by weight of the copolymer, and having a crystallinity of less than 20% and being at least partially cross-linked such that the degree of cross-link is at least 20%.
    Type: Application
    Filed: June 26, 2014
    Publication date: October 16, 2014
    Inventors: Peijun Jiang, Armenag Dekmezian, Aspy K. Mehta, Sunny Jacob, Andrew G. Narvaez, Jr., Pradeep P. Shirodkar, Weiqing Weng
  • Vulcanized Polymer Blends
    Publication number: 20140309358
    Abstract: A heterogeneous vulcanized polymer blend comprising a continuous phase comprising a thermoplastic polypropylene having a crystallinity of at least 30% and a dispersed phase comprising particles of an elastomeric copolymer dispersed in the continuous phase and having an average particle size of less than 5 micron. The elastomeric copolymer has a crystallinity of less than 20% and is at least partially cross-linked such that no more than about 80 wt % of the elastomeric copolymer is extractable in cyclohexane at 23° C.
    Type: Application
    Filed: June 26, 2014
    Publication date: October 16, 2014
    Inventors: Sunny Jacob, Peijun Jiang, Aspy K. Mehta, Pradeep P. Shirodkar, Armenag H. Dekmezian
  • Catalyst system, process for olefin polymerization, and polymer compositions produced therefrom
    Patent number: 8835587
    Abstract: Provided are catalyst systems, processes for polymerizing one or more olefins, polymers resulting therefrom, and articles prepared from such polymers. The processes comprise contacting under polymerization conditions one or more olefin monomers, preferably propylene, with a catalyst system comprising a transition metal compound and an activator of the formula (1) or (2) as described herein. The polymer compositions described herein exhibit advantageously narrow composition distributions and high melting points in comparison to conventional polymers having the same comonomer content. The polymers described herein exhibit improved properties, e.g., pellet stability, impact properties, heat seal properties, and structural integrity in film and fabricated parts applications.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: September 16, 2014
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Donna J. Crowthers, Peijun Jiang, Rainer Kolb
  • Process for Controlling Molecular Weight of Polyolefins Prepared Using Pyridyl Diamide Catalyst Systems
    Publication number: 20140221587
    Abstract: Pyridyldiamido transition metal complexes are disclosed for use in alkene polymerization to produce polyolefins.
    Type: Application
    Filed: January 20, 2014
    Publication date: August 7, 2014
    Inventors: John R. Hagadorn, Matthew S. Bedoya, Peijun Jiang