Patents by Inventor Nikos Hadjichristidis

Nikos Hadjichristidis 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: 20240228903
    Abstract: A blend for lubricating a surface includes a lubricant and a polyepoxide co(ter)polymer additive mixed with the lubricant. The polyepoxide co(ter)polymer additive includes a first block having monomer M1 and a second block having monomer M2. The first monomer M1 includes hexene oxide, HO, or octene oxide, OO, and the second monomer M2 includes propylene oxide, PO.
    Type: Application
    Filed: March 14, 2022
    Publication date: July 11, 2024
    Applicants: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY, SAUDI ARABIAN OIL COMPANY
    Inventors: Subram Mani SARATHY, Nikos HADJICHRISTIDIS, Viko LADELTA, Tsu-fang HONG
  • Publication number: 20240132798
    Abstract: A blend for lubricating a surface includes a lubricant and a polyepoxide co(ter)polymer additive mixed with the lubricant. The polyepoxide co(ter)polymer additive includes a first block having monomer M1 and a second block having monomer M2. The first monomer M1 includes hexene oxide, HO, or octene oxide, OO, and the second monomer M2 includes propylene oxide, PO.
    Type: Application
    Filed: March 13, 2022
    Publication date: April 25, 2024
    Applicants: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY, SAUDI ARABIAN OIL COMPANY
    Inventors: Subram Mani SARATHY, Nikos HADJICHRISTIDIS, Viko LADELTA, Tsu-fang HONG
  • Patent number: 11753503
    Abstract: Supported onium salts used as initiators for the synthesis of polycarbonates by copolymerization of carbon dioxide with epoxides are described. Embodiments of the present disclosure describe initiators comprising an insoluble portion including an onium cation attached to an insoluble support; and an anion, wherein the anion is a counter-ion to the onium cation. Embodiments further describe methods of making polycarbonates using the initiator, methods of making initiators, and the like.
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: September 12, 2023
    Assignee: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Xiaoshuang Feng, Naganatha Patil, Caroline Luciani, Yves Gnanou, Nikos Hadjichristidis
  • Publication number: 20220033556
    Abstract: Embodiments include degradable polyethers comprising ester units from a cyclic ester or carbonate units from carbon dioxide incorporated into a poly(ethylene oxide) backbone or a multifunctional core of a degradable polyether star. Embodiments include methods of forming a degradable polyether comprising contacting an ethylene oxide monomer with a lactide monomer or carbon dioxide in the presence of an alkyl borane and an initiator. Embodiments include methods of forming degradable polyether stars comprising contacting a diepoxide monomer with carbon dioxide and/or a cyclic ester in the presence of an initiator and a first amount of an alkyl borane to form a multifunctional core comprising degradable carbonate linkages and/or degradable ester linkages, and contacting the multifunctional core with an ethylene oxide monomer in the presence of a second amount of an alkyl borane to form arms of a polyether attached to the degradable multifunctional core.
    Type: Application
    Filed: September 17, 2019
    Publication date: February 3, 2022
    Inventors: Xiaoshuang FENG, Jobi VARGHESE, Yves GNANOU, Nikos HADJICHRISTIDIS, Mingchen JIA, Dhanya AUGUSTINE
  • Publication number: 20220010040
    Abstract: Embodiments of the present disclosure describe a method of removing an end group from a polymer comprising contacting a polymer having a thiocarbonylthio end group, or a solution containing such a polymer, with an excess of a borane compound in the presence of oxygen. Embodiments of the present disclosure further describe a method of polymerization comprising contacting one or more monomers with an initiator and a chain transfer agent to form a polymer having a thiocarbonylthio end group in a reaction solution and contacting the polymer with a borane compound in the presence of oxygen to remove the thiocarbonylthio end group from the polymer.
    Type: Application
    Filed: November 14, 2019
    Publication date: January 13, 2022
    Inventors: Xiaoshuang FENG, Prakash ALAGI, Yves GNANOU, Nikos HADJICHRISTIDIS
  • Publication number: 20220010060
    Abstract: Embodiments of the present disclosure describe polymerization systems for the synthesis of polycarbonate polyols, methods of synthesizing polycarbonate polyols using the polymerization systems, methods of recovering initiators and/or activators for use or re-use in the synthesis of polycarbonate polyol, and the like. The polymerization systems can comprise an initiator including a mono- or multi-functional carboxylate or carbonate salt having an organic cation as a counter-ion; an optional co-initiator including a mono- or multi-functional protic compound selected from acids, alcohols, water, and combinations thereof; and an activator including a borane compound selected from alkyl boranes and aryl boranes; wherein the activator and one or more of the initiator and co-initiator associate to form an ate complex.
    Type: Application
    Filed: December 12, 2019
    Publication date: January 13, 2022
    Inventors: Xiaoshuang FENG, Naganath PATIL, Senthil BOOPATHI, Yves GNANOU, Nikos HADJICHRISTIDIS
  • Publication number: 20210309801
    Abstract: Degradable ethylene oxide-based copolymers, including random, tapering, and block copolymers are described. For example, the present disclosure describes materials and methods for synthesizing degradable hydrophilic ethylene oxide-based copolymers, degradable amphiphilic ethylene oxide-based block copolymers, degradable hydrophobic polyethers and degradable functionalized polyethers via boron-activated copolymerization of ethylene oxide monomers with carbon dioxide.
    Type: Application
    Filed: March 17, 2021
    Publication date: October 7, 2021
    Inventors: Xiaoshuang FENG, Jobi VARGHESE, Yves GNANOU, Nikos HADJICHRISTIDIS, Mingchen JIA, Dhanya AUGUSTINE
  • Publication number: 20210070932
    Abstract: Supported onium salts used as initiators for the synthesis of polycarbonates by copolymerization of carbon dioxide with epoxides are described. Embodiments of the present disclosure describe initiators comprising an insoluble portion including an onium cation attached to an insoluble support; and an anion, wherein the anion is a counter-ion to the onium cation. Embodiments further describe methods of making polycarbonates using the initiator, methods of making initiators, and the like.
    Type: Application
    Filed: May 17, 2019
    Publication date: March 11, 2021
    Inventors: Xiaoshuang FENG, Naganatha PATIL, Caroline LUCIANI, Yves GNANOU, Nikos HADJICHRISTIDIS
  • Patent number: 9309337
    Abstract: Provided are blends of branched hydrocarbon comb polymers having tailored branching and molecular weight parameters, with substantially linear polymers. Such blends have been found to have improved extensional rheological properties, while maintaining nearly the viscosity of the substantially linear polymers. The blends of the hydrocarbon comb polymers with the substantially linear polymers thus maintain the extrusion processing characteristics of the linear polymer alone, but have improved extensional flow processability, with strain hardening ratios (SHR) greater than 1. The blends are effective in blown film processing. Also disclosed are related methods for improving extensional flow processability using the branched hydrocarbon comb polymers, as well as the branched hydrocarbon comb polymers themselves, including as a property enhancing additive for such substantially linear polymers.
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: April 12, 2016
    Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Johannes Matthieu Soulages, David John Lohse, Andy Haishung Tsou, Thomas Sun, Pamela Jean Wright, Nikos Hadjichristidis, Pradeep Pandurang Shirodkar
  • Patent number: 8703666
    Abstract: Provided is a method for stabilizing a dispersion of a carbon nanomaterial in a lubricating oil basestock. The method includes providing a lubricating oil basestock; dispersing a carbon nanomaterial in the lubricating oil basestock; and adding at least one block copolymer thereto. The at least one block copolymer has two or more blocks includes at least one alkenylbenzene block and at least one linear alpha olefin block. The at least one block copolymer is present in an amount sufficient to stabilize the dispersion of the carbon nanomaterial in the lubricating oil basestock. Also provided is a lubricating engine oil having a composition including: a lubricating oil base stock; a carbon nanomaterial dispersed in the lubricating oil basestock; and at least one block copolymer.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: April 22, 2014
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Andy Haishung Tsou, Vera Minak-Bernero, Martin N. Webster, Nikos Hadjichristidis
  • Patent number: 8623980
    Abstract: A process for making a substantially saturated dendritic hydrocarbon polymer. The process has the following steps: (a) polymerizing an amount of a first alkadiene monomer under anionic conditions in the presence of a first organic monolithium initiator to produce a linear polyalkadiene having a lithiated chain end; (b) reacting the linear polyalkadiene with an amount of a second organic monolithium initiator in the presence of tetramethylethylene diamine to form a multilithiated polyalkadiene; (c) reacting the multilithiated polyalkadiene with an amount of a second alkadiene monomer to form a branched polyalkadiene; (d) repeating steps (b) and (c) with the branched polyalkadiene one or more times to prepare a dendritic polyalkadiene; and (e) hydrogenating the dendritic polyalkadiene to form the substantially saturated dendritic hydrocarbon polymer.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: January 7, 2014
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: David John Lohse, Nikos Hadjichristidis, Andy Haishung Tsou, Pamela J. Wright, Suzzy Chen Hsi Ho, Paul Edward Schuenzel
  • Patent number: 8604136
    Abstract: A process for making a substantially saturated dendritic hydrocarbon polymer. The process has the following steps: (a) polymerizing an amount of one or more alkadiene monomers and/or one or more alkenylaromatic polymers under anionic conditions in the presence of a di- or tri-functional organic lithium initiator to produce a polyalkadiene defining a multiplicity of lithiated chain ends; (b) reacting the polyalkadiene with an amount of a tri- or di-functional silane coupling agent to form a dendritic polyalkadiene; and (c) hydrogenating the dendritic polyalkadiene to form a substantially saturated dendritic hydrocarbon polymer.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: December 10, 2013
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: David John Lohse, Nikos Hadjichristidis, Andy Haishung Tsou, Suzzy C. H. Ho, Paul Edward Schuenzel
  • Publication number: 20130324447
    Abstract: Provided is a method for stabilizing a dispersion of a carbon nanomaterial in a lubricating oil basestock. The method includes providing a lubricating oil basestock; dispersing a carbon nanomaterial in the lubricating oil basestock; and adding at least one block copolymer thereto. The at least one block copolymer has two or more blocks includes at least one alkenylbenzene block and at least one linear alpha olefin block. The at least one block copolymer is present in an amount sufficient to stabilize the dispersion of the carbon nanomaterial in the lubricating oil basestock. Also provided is a lubricating engine oil having a composition including: a lubricating oil base stock; a carbon nanomaterial dispersed in the lubricating oil basestock; and at least one block copolymer.
    Type: Application
    Filed: June 1, 2012
    Publication date: December 5, 2013
    Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Andy Haishung Tsou, Vera Minak-Bernero, Martin N. Webster, Nikos Hadjichristidis
  • Publication number: 20130261264
    Abstract: Provided are blends of branched hydrocarbon comb polymers having tailored branching and molecular weight parameters, with substantially linear polymers. Such blends have been found to have improved extensional rheological properties, while maintaining nearly the viscosity of the substantially linear polymers. The blends of the hydrocarbon comb polymers with the substantially linear polymers thus maintain the extrusion processing characteristics of the linear polymer alone, but have improved extensional flow processability, with strain hardening ratios (SHR) greater than 1. The blends are effective in blown film processing. Also disclosed are related methods for improving extensional flow processability using the branched hydrocarbon comb polymers, as well as the branched hydrocarbon comb polymers themselves, including as a property enhancing additive for such substantially linear polymers.
    Type: Application
    Filed: April 2, 2013
    Publication date: October 3, 2013
    Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Johannes Mattieu Soulages, David John Lohse, Andy Haishung Tsou, Thomas Sun, Pamela Jean Wright, Nikos Hadjichristidis, Pradeep Pandurang Shirodkar
  • Patent number: 8487061
    Abstract: Provided is a process for making a saturated star hydrocarbon polymer. The process has the following steps: (A) hydrosilylating tetraethylene silicon with methyldichlorosilane in the presence of a hydrosilylating catalyst to form a chlorosilane dendrimer; (B) reacting the chlorosilane dendrimer with vinylmagnesium bromide in the presence of a lithium and/or organolithium initiator stepwise to build a higher generation chlorosilane dendrimer; (C) anionically polymerizing polybutadiene in the presence of a lithium and/or organolithium initiator to form living poly(butadienyl)lithium; (D) attaching the living poly(butadienyl)lithium to the higher generation dendrimer to form a star polybutadiene; and (E) hydrogenating the star polybutadiene to form the saturated star hydrocarbon polymer. There is also provided a saturated star hydrocarbon polymer made according to the above process and a polymer composition of a matrix ethylene polymer and the saturated star hydrocarbon polymer.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: July 16, 2013
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Andy H. Tsou, Nikos Hadjichristidis, Pamela J. Wright, Johannes M. Soulages
  • Publication number: 20120296046
    Abstract: Provided is a process for making a saturated star hydrocarbon polymer. The process has the following steps: (A) hydrosilylating tetraethylene silicon with methyldichlorosilane in the presence of a hydrosilylating catalyst to form a chlorosilane dendrimer; (B) reacting the chlorosilane dendrimer with vinylmagnesium bromide in the presence of a lithium and/or organolithium initiator stepwise to build a higher generation chlorosilane dendrimer; (C) anionically polymerizing polybutadiene in the presence of a lithium and/or organolithium initiator to form living poly(butadienyl)lithium; (D) attaching the living poly(butadienyl)lithium to the higher generation dendrimer to form a star polybutadiene; and (E) hydrogenating the star polybutadiene to form the saturated star hydrocarbon polymer. There is also provided a saturated star hydrocarbon polymer made according to the above process and a polymer composition of a matrix ethylene polymer and the saturated star hydrocarbon polymer.
    Type: Application
    Filed: May 17, 2011
    Publication date: November 22, 2012
    Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Andy H. Tsou, Nikos Hadjichristidis, Pamela J. Wright, Johannes M. Soulages
  • Publication number: 20120157633
    Abstract: A process for making a substantially saturated dendritic hydrocarbon polymer. The process has the following steps: (a) polymerizing an amount of a first alkadiene monomer under anionic conditions in the presence of a first organic monolithium initiator to produce a linear polyalkadiene having a lithiated chain end; (b) reacting the linear polyalkadiene with an amount of a second organic monolithium initiator in the presence of tetramethylethylene diamine to form a multilithiated polyalkadiene; (c) reacting the multilithiated polyalkadiene with an amount of a second alkadiene monomer to form a branched polyalkadiene; (d) repeating steps (b) and (c) with the branched polyalkadiene one or more times to prepare a dendritic polyalkadiene; and (e) hydrogenating the dendritic polyalkadiene to form the substantially saturated dendritic hydrocarbon polymer.
    Type: Application
    Filed: December 19, 2011
    Publication date: June 21, 2012
    Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: David John Lohse, Nikos Hadjichristidis, Andy Haishung Tsou, Pamela J. Wright, Suzzy Chen Hsi Ho, Paul Edward Schuenzel
  • Patent number: 8168724
    Abstract: The present invention relates to a method to produce highly branched polymers with a polyolefin backbone structure of ethylene and precise control of the nature of the branching. In particular, the distribution of branch length and number of branches can be more precisely controlled via the polymerization method of the present invention. The method comprises using anionic chemistry to make unsaturated polydienes with a well-defined, highly-branched structure, and then hydrogenating these polydienes to form highly branched or dendritic saturated hydrocarbon polymers. Highly branched or dendritic polyethylene, ethylene-propylene copolymer and atactic polypropylene are among the saturated hydrocarbon polymers that can be anionically synthesized via the proper selection of diene monomer type, coupling agent, and hydrogenation conditions.
    Type: Grant
    Filed: February 5, 2010
    Date of Patent: May 1, 2012
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: David J. Lohse, C├ęsar Garcia-Franco, Nikos Hadjichristidis
  • Publication number: 20110118420
    Abstract: A process for making a substantially saturated dendritic hydrocarbon polymer. The process has the following steps: (a) polymerizing an amount of one or more alkadiene monomers and/or one or more alkenylaromatic polymers under anionic conditions in the presence of a di- or tri-functional organic lithium initiator to produce a polyalkadiene defining a multiplicity of lithiated chain ends; (b) reacting the polyalkadiene with an amount of a tri- or di-functional silane coupling agent to form a dendritic polyalkadiene; and (c) hydrogenating the dendritic polyalkadiene to form a substantially saturated dendritic hydrocarbon polymer.
    Type: Application
    Filed: October 14, 2010
    Publication date: May 19, 2011
    Applicant: ExxonMobil Research and Engineering Company
    Inventors: David John Lohse, Nikos Hadjichristidis, Andy Haishung Tsou, Suzzy C.H. Ho, Paul Edward Schuenzel
  • Patent number: 7799416
    Abstract: The current invention involves periodically ordered nanostructured materials and methods of using and modifying the materials. In some embodiments, the invention provides periodically structured microphase separated polymeric articles that include periodically occurring separate domains. The polymeric species comprising one or more of the domains, for some embodiments, contains an inorganic species capable of forming an inorganic oxide ceramic. In another aspect, the invention provides methods for modifying the polymeric articles by oxidation and/or radiation to form periodically structured porous and relief articles that, in some embodiments, include a ceramic oxide in their structure. The invention also provides methods of use for the novel articles and novel structures constructed utilizing the articles.
    Type: Grant
    Filed: July 2, 1999
    Date of Patent: September 21, 2010
    Assignees: Massachusetts Institute of Technology, International Business Machines Corporation
    Inventors: Vanessa Z. H. Chan, Edwin L. Thomas, Victor Y. Lee, Robert D. Miller, Apostolos Avgeropoulos, Nikos Hadjichristidis