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).

  • Publication number: 20220289879
    Abstract: This invention relates to polymers comprising: one or more that include 1) at least 11 wt % 4 substituted 1,4 hexadiene and less than 20 wt % 5-methyl-1,4-hexadiene, based upon the weight of the polymer, and 2) optionally, one or more olefins; and processes to produces such polymers using metallocene or post-metallocene catalyst compounds.
    Type: Application
    Filed: February 23, 2022
    Publication date: September 15, 2022
    Inventors: Alex E. Carpenter, Tzu-Pin Lin, Brian J. Rohde, Sarah J. Mattler, Nikola S. Lambic, Hsu Chiang, Peijun Jiang, Irene C. Cai, Gursu Culcu, Jarod M. Younker
  • Patent number: 11421050
    Abstract: The present disclosure provides the use of quinolinyldiamido transition metal complexes, an activator and a metal hydrocarbenyl chain transfer agent, such as an aluminum vinyl-transfer agent, to produce long chain branched propylene polymers.
    Type: Grant
    Filed: October 15, 2020
    Date of Patent: August 23, 2022
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: John R. Hagadorn, Jo Ann M. Canich, Peijun Jiang, Maksim E. Shivokhin
  • Patent number: 11414436
    Abstract: The present disclosure provides borate or aluminate activators comprising cations having linear alkyl groups, catalyst systems comprising, and methods for polymerizing olefins using such activators. Specifically, the present disclosure provides activator compounds represented by Formula: [R1R2R3EH]d+[Mk+Qn]d?, wherein: E is nitrogen or phosphorous; d is 1, 2 or 3; k is 1, 2, or 3; n is 1, 2, 3, 4, 5, or 6; n?k=d; R1 is C1-C20 linear alkyl group; each of R2 and R3 is a C1-C40 linear alkyl group, a meta- and/or para-substituted phenyl group, an alkoxy group, a silyl group, a halogen, or a halogen containing group, wherein R1+R2+R3?15 carbon atoms; M is an element selected from group 13, typically B or Al; and each Q is independently a hydride, bridged or unbridged dialkylamido, halide, alkoxide, aryloxide, hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, or halosubstituted-hydrocarbyl radical, provided that when Q is a fluorophenyl group, then R2 is not a C1-C40 linear alkyl group.
    Type: Grant
    Filed: April 25, 2019
    Date of Patent: August 16, 2022
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Catherine A. Faler, Margaret T. Whalley, Peijun Jiang, John R. Hagadorn, Crisita Carmen H. Atienza, Alex E. Carpenter, George Rodriguez
  • Publication number: 20220251361
    Abstract: The present disclosure provides methods for producing an olefin polymer by contacting a C3-C40 olefin and ethylene with a catalyst system including an activator and a metallocene catalyst compound comprising a substituted or unsubstituted tetrahydro-s-indacenyl group and obtaining a C3-C40 olefin-ethylene copolymer typically comprising from 0.5 to 43 wt % ethylene, and from 99.5 to 57 wt % C3 to C40 comonomer wherein the Tg of the terpolymer is from 0 to ?60° C.
    Type: Application
    Filed: July 17, 2020
    Publication date: August 11, 2022
    Inventors: Zhifeng Bai, Jo Ann M. Canich, Jingwen Zhang, Peijun Jiang, Adrian Garcia Barry, Chase A. Eckert, Sarah J. Mattler
  • Patent number: 11390704
    Abstract: Compositions are provided which include blends of (A) branched and/or bimodal ethylene copolymers and (B) linear ethylene copolymers. The branched and/or bimodal ethylene copolymers may be produced using a dual metallocene catalyst system comprising two different metallocene catalysts: one capable of producing high Mooney-viscosity polymers and one suitable for producing polymers having at least a portion of vinyl terminations. The linear ethylene copolymers may be produced using a metallocene catalyst capable of producing high Mooney-viscosity polymers, which may be the same as such catalyst of the dual metallocene catalyst system. Processes for making such blends, including parallel and/or series polymerization processes, are also provided. The blends may have excellent cure properties suitable in curable rubber compound applications.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: July 19, 2022
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Narayanaswami Dharmarajan, Francis C. Rix, Jo Ann M. Canich, Danica L. Nguyen, Peijun Jiang, Rhutesh K. Shah
  • Patent number: 11352451
    Abstract: Processes are provided which include copolymerization using two different metallocene catalysts, one capable of producing high Mooney-viscosity polymers and one suitable for producing lower Mooney-viscosity polymers having at least a portion of vinyl terminations. The two catalysts may be used together in polymerization to produce copolymer compositions of particularly well-tuned properties. For instance, polymerizations are contemplated to produce high-Mooney metallocene polymers that exhibit excellent processability and elasticity, notwithstanding their high Mooney viscosity. Other polymerizations are also contemplated in which lower-Mooney metallocene polymers are produced, which also exhibit excellent processability and elasticity, while furthermore having excellent cure properties suitable in curable elastomer compound applications.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: June 7, 2022
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Francis C. Rix, Rhutesh K. Shah, Rainer Kolb, Jo Ann M. Canich, Peijun Jiang, Periagaram S. Ravishankar, Syamal Tallury
  • Publication number: 20220162348
    Abstract: This invention relates to a polymerization process for forming polymer comprising: contacting (typically in a solution or slurry phase), a monomer and a catalyst system in a reaction zone comprising at least one spiral heat exchanger and recovering polymer, wherein the monomer, the catalyst system and the polymer flow through the at least one spiral heat exchanger in a cross-flow direction relative to spirals of the at least one spiral heat exchanger.
    Type: Application
    Filed: February 10, 2022
    Publication date: May 26, 2022
    Inventors: Jay L. Reimers, Kevin W. Lawson, Peijun Jiang, Gabor Kiss
  • Patent number: 11279775
    Abstract: This invention relates to a polymerization process for forming polymer comprising: contacting (typically in a solution or slurry phase), a monomer and a catalyst system in a reaction zone comprising at least one spiral heat exchanger and recovering polymer, wherein the monomer, the catalyst system and the polymer flow through the at least one spiral heat exchanger in a cross-flow direction relative to spirals of the at least one spiral heat exchanger.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: March 22, 2022
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Jay L. Reimers, Kevin W. Lawson, Peijun Jiang, Gabor Kiss
  • Patent number: 11248113
    Abstract: The present disclosure provides copolymers comprising from about 0.5 wt % to about 25 wt % cyclic olefin content and films comprising the copolymers. In one embodiment, a copolymer includes a C2-C40 monomer content of from about 75 wt % to about 99.5 wt %; and a C5-C40 cyclic olefin comonomer content of from about 0.5 wt % to about 25 wt %. The copolymer has a density of about 0.91 g/cm3 to about 0.933 g/cm3. Films of the present disclosure can have advantageous mechanical properties (such as melt strength) and optical properties (such as haze %).
    Type: Grant
    Filed: November 22, 2019
    Date of Patent: February 15, 2022
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: David M. Fiscus, Peijun Jiang, Yong Yang
  • Publication number: 20220033549
    Abstract: High molecular weight elastomers, such as ethylene-propylene-diene monomer (EPDM) polymers, are conventionally formulated with a post-polymerization oil extension to mitigate their high Mooney viscosity. Post-polymerization oil extension adds to processing costs and precludes use of polymerization facilities lacking oil extension capabilities. A low molecular weight polymer may be co-produced with a high molecular weight elastomer containing the same monomers, where the low molecular weight polymer may function in place of conventional oil extension. Polymerization methods may comprise: combining one or more olefinic monomers, a metallocene first catalyst component and a non-metallocene transition metal second catalyst component, and a solvent; and reacting the one or more olefinic monomers under solution polymerization conditions to form a polyolefin blend comprising first and second polyolefins having a bimodal molecular weight distribution.
    Type: Application
    Filed: January 7, 2020
    Publication date: February 3, 2022
    Inventor: Peijun Jiang
  • Publication number: 20210380734
    Abstract: This invention relates bisindenyl metallocene catalyst compounds having long (at least 4 carbon atoms) linear alkyl groups substituted at the two position and substituted or unsubstituted aryl groups at the four position and process using such catalyst compounds, particularly in the solution process at higher temperatures.
    Type: Application
    Filed: June 21, 2021
    Publication date: December 9, 2021
    Inventors: Jian Yang, Peijun Jiang, Xiongdong Lian
  • Patent number: 11180644
    Abstract: The present invention relates to a branched modifier and 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 0.70 or less; b) an Mw of 100,000 g/mol or more; c) an Mw/Mn of 4.0 or more; d) a shear thinning ratio of 110 or more, e) a melt strength of 10 cN or more; f) a complex viscosity at 0.1 rad/sec at 190° C. of at least 130,000 Pa·s; and g) a phase angle of Z° or less where Z=138.3G*(?0.142), where G* is the complex modulus reported in Pascals measured at 190° C. and the phase angle units are reported in degrees, wherein the G* is from 1,000 to 1,000,000 Pa.
    Type: Grant
    Filed: July 3, 2019
    Date of Patent: November 23, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Jianya Cheng, Pradeep P. Shirodkar, Peijun Jiang, Johannes M. Soulages
  • Publication number: 20210332164
    Abstract: It has become desirable to limit or exclude aromatic solvents, such as toluene, from polymerization reactions. For polymerization reactions employing a non-metallocene transition metal complex as a precursor to a polymerization catalyst, exclusion of aromatic solvents may be difficult due to the limited solubility of such complexes in aliphatic hydrocarbon solvents. Aliphatic hydrocarbon solutions suitable for conducting olefin polymerization reactions, particularly solution polymerization reactions, may comprise: a non-metallocene transition metal complex dissolved in an aliphatic hydrocarbon solvent at a concentration ranging from about 2 mM to about 20 mM at 25° C. in the presence of an organoaluminum compound. A molar ratio of aluminum of the organoaluminum compound to transition metal of the transition metal complex is about 1:1 or greater, and the organoaluminum compound comprises at least about 8 carbons per aluminum.
    Type: Application
    Filed: April 9, 2021
    Publication date: October 28, 2021
    Inventors: John R. Hagadorn, Peijun Jiang, Francis C. Rix, Charles J. Harlan, Jo Ann M. Canich
  • Patent number: 11130828
    Abstract: Disclosed is a solution polymerization process, or, alternatively, a method of delivering powder catalysts to a solution polymerization reactor, comprising combining a homogeneous single-site catalyst precursor with ?-olefin monomers to form a polyolefin, wherein the homogeneous single-site catalyst precursor is in the form of (i) a dry powder, (ii) suspended in a aliphatic hydrocarbon solvent, or (iii) suspended in an oil or wax, wherein the homogeneous single-site catalyst precursor is at a concentration greater than 0.8 mmole/liter when suspended in the aliphatic hydrocarbon solvent prior to entering the solution polymerization reactor.
    Type: Grant
    Filed: September 11, 2019
    Date of Patent: September 28, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Peijun Jiang, Robert T. Li, Jay L. Reimers
  • Patent number: 11059918
    Abstract: This invention relates bisindenyl metallocene catalyst compounds having long (at least 4 carbon atoms) linear alkyl groups substituted at the two position and substituted or unsubstituted aryl groups at the four position and process using such catalyst compounds, particularly in the solution process at higher temperatures.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: July 13, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Jian Yang, Peijun Jiang, Xiongdong Lian
  • Patent number: 11041035
    Abstract: The present disclosure provides methods for producing an olefin polymer including: i) contacting alpha-olefin with a first catalyst system comprising a first non-metallocene catalyst, a first activator, and a reversible chain transfer agent to form a first polymer; ii) contacting the first polymer with a coupling agent in the presence of a catalyst, an activator; and iii) obtaining a second polymer. The present disclosure further provides polymers having a g?vis value from about 0.4 to about 0.8 and a vinyl unsaturation content of 0.8 or greater vinyls/1000 carbons, and preferably low gel content.
    Type: Grant
    Filed: March 1, 2019
    Date of Patent: June 22, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: John R. Hagadorn, Jo Ann M. Canich, Jingwen Zhang, Peijun Jiang, Britni J. Brobey
  • Patent number: 11034819
    Abstract: Disclosed are self-assembled propylene-based bi-layer compositions having a skin layer comprising a propylene-based elastomer-toughened composition and a core layer comprising a propylene-based fiber-reinforced composition, wherein the propylene-based elastomer-toughened composition and propylene-based fiber-reinforced composition self-assemble upon mixing into the skin layer and the core layer. Processes for producing these self-assembled propylene-based compositions are also disclosed.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: June 15, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Andy H. Tsou, John R. Hagadorn, Viktor Buchholz, Peijun Jiang
  • Patent number: 10995170
    Abstract: This invention relates to the use of pyridyldiamido and/or quinolinyldiamido transition metal complexes and catalyst systems with an activator and a metal hydrocarbenyl chain transfer agent, such as an aluminum vinyl-transfer agent (AVTA), to produce branched ethylene copolymers, preferably ethylene-butene, ethylene-hexene and ethylene-octene copolymers.
    Type: Grant
    Filed: April 27, 2020
    Date of Patent: May 4, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Jo Ann M. Canich, John R. Hagadorn, Peijun Jiang
  • Publication number: 20210107930
    Abstract: This invention relates homogeneous (typically solution) polymerization of propylene and optional olefin comonomer using metallocene catalyst compounds having a 1,5,6,7-tetrahydro-s-indacenyl moiety bridged to another indacenyl moiety or bridged to a substituted or unsubstituted indenyl moiety.
    Type: Application
    Filed: October 9, 2020
    Publication date: April 15, 2021
    Inventors: Jian Yang, Peijun Jiang
  • Patent number: 10927196
    Abstract: The present disclosure provides the use of quinolinyldiamido transition metal complexes, an activator and a metal hydrocarbenyl chain transfer agent, such as an aluminum vinyl-transfer agent, to produce long chain branched propylene polymers.
    Type: Grant
    Filed: July 3, 2018
    Date of Patent: February 23, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: John R. Hagadorn, Jo Ann M. Canich, Peijun Jiang, Maksim E. Shivokhin