Patents by Inventor Chia S. Chee

Chia S. Chee 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: 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
  • Patent number: 7858714
    Abstract: This invention is directed to processes of making polymer in the presence of a fluorinated hydrocarbon and recovering the polymer. The processes provided enable polymerization processes to be practiced with minimal fouling in the reaction system, and allows for the recovery of the fluorinated hydrocarbon and other hydrocarbons such as hydrocarbons for reuse in the process or hydrocarbon by-products from the polymerization process. The invention is particularly beneficial in the production of propylene based polymers using Ziegler Natta catalyst systems.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: December 28, 2010
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Robert O. Hagerty, Chia S. Chee, Randall B. Laird, Michael A. Risch, Pradeep P. Shirodkar, Peijun Jiang
  • Patent number: 7728084
    Abstract: This invention is directed to processes of making polymer in the presence of a hydrofluorocarbon or perfluorocarbon and recovering the polymer. The processes provided enable polymerization processes to be practiced with minimal fouling in the reaction system, and to the recovery of the hydrofluorocarbon and other hydrocarbons such as hydrocarbons for reuse in the process or hydrocarbon by-products from the polymerization process. The invention is particularly beneficial in the production of ethylene based polymers using Ziegler Natta catalyst systems.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: June 1, 2010
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Robert O. Hagerty, Chia S. Chee, Randall B. Laird, Michael A. Risch, Pradeep P. Shirodkar, Zerong Lin, Larry L. Iaccino
  • Patent number: 7691956
    Abstract: This invention is directed to processes of making polymer in the presence of a hydrofluorocarbon or perfluorocarbon and recovering the polymer. The processes provided enable polymerization processes to be practiced with minimal fouling in the reaction system, and to the recovery of the hydrofluorocarbon and other hydrocarbons such as hydrocarbons for reuse in the process or hydrocarbon by-products from the polymerization process. The invention is particularly beneficial in the production of ethylene based polymers using bulky ligand metallocene-type catalyst systems.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: April 6, 2010
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Robert O. Hagerty, Chia S. Chee, Randall B. Laird, Michael A. Risch, Pradeep P. Shirodkar, Zerong Lin, Larry L. Iaccino
  • Patent number: 7491776
    Abstract: This invention is directed to processes of making polymer in the presence of a hydrofluorocarbon or perfluorocarbon and recovering the polymer. The processes provided enable polymerization processes to be practiced with minimal fouling in the reaction system, and provide polymer products that can be manufactured to relatively low densities. The invention is particularly beneficial in the production of ethylene based polymers using chromium catalyst systems.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: February 17, 2009
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Robert O. Hagerty, Chia S. Chee, Randall B. Laird, Michael A. Risch, Pradeep P. Shirodkar, Zerong Lin, Larry L. Iaccino
  • Publication number: 20080081885
    Abstract: This invention is directed to processes of making polymer in the presence of a hydrofluorocarbon or perfluorocarbon and recovering the polymer. The processes provided enable polymerization processes to be practiced with minimal fouling in the reaction system, and to the recovery of the hydrofluorocarbon and other hydrocarbons such as hydrocarbons for reuse in the process or hydrocarbon by-products from the polymerization process. The invention is particularly beneficial in the production of ethylene based polymers using bulky ligand metallocene-type catalyst systems.
    Type: Application
    Filed: June 20, 2005
    Publication date: April 3, 2008
    Inventors: Robert O. Hagerty, Chia S. Chee, Randall B. Laird, Michael A. Risch, Pradeep P. Shirodkar, Zerong Lin, Larry L. Iaccino
  • Patent number: 6372858
    Abstract: A solid nucleophilic reagent for the conversion of benzylic halogen functionality on polymers to other functionalities, and methods of making and using the same.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: April 16, 2002
    Assignee: Exxon Mobil Chemical Patents Inc.
    Inventors: Chia S. Chee, Hsien-Chang Wang, Kenneth William Powers
  • Patent number: 6156810
    Abstract: A solid nucleophilic reagent for the conversion of benzylic halogen functionality on polymers to other functionalities, and methods of making and using the same.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: December 5, 2000
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: Chia S. Chee, Hsien-Chang Wang, Kenneth William Powers