Patents by Inventor Tak W. Leung

Tak W. Leung 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: 20190338054
    Abstract: Disclosed are catalyst compositions having an internal electron donor which includes a 3,6-di-substituted-1,2-phenylene aromatic diester. Ziegler-Natta catalyst compositions containing the present catalyst compositions exhibit very high hydrogen response, high activity, high selectivity and produce propylene-based olefins with high melt flow rate.
    Type: Application
    Filed: June 19, 2019
    Publication date: November 7, 2019
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao, Kuanqiang Gao
  • Patent number: 10358505
    Abstract: Disclosed are catalyst compositions having an internal electron donor which includes a 3,6-di-substituted-1,2-phenylene aromatic diester. Ziegler-Natta catalyst compositions containing the present catalyst compositions exhibit very high hydrogen response, high activity, high selectivity and produce propylene-based olefins with high melt flow rate.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: July 23, 2019
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao, Kuanqiang Gao
  • Patent number: 9534063
    Abstract: Disclosed are procatalyst compositions having an internal electron donor which include a substituted phenylene aromatic diester and optionally an electron donor component. Ziegler-Natta catalyst compositions containing the present procatalyst compositions exhibit high activity and produce propylene-based olefins with broad molecular weight distribution.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: January 3, 2017
    Assignee: W. R. GRACE & CO.—CONN
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao
  • Publication number: 20160280808
    Abstract: Disclosed are procatalyst compositions having an internal electron donor which include a substituted phenylene aromatic diester and optionally an electron donor component. Ziegler-Natta catalyst compositions containing the present procatalyst compositions exhibit high activity and produce propylene-based olefins with broad molecular weight distribution.
    Type: Application
    Filed: June 6, 2016
    Publication date: September 29, 2016
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao
  • Patent number: 9441058
    Abstract: Disclosed are procatalyst compositions having an internal electron donor which includes a substituted amide ester and optionally an electron donor component. Ziegler-Natta catalyst compositions containing the present procatalyst compositions exhibit improved catalyst activity and/or improved catalyst selectivity and produce propylene-based olefins with broad molecular weight distribution.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: September 13, 2016
    Assignee: W. R. Grace & Co.—Conn.
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao, Kuanqiang Gao, James X. Shu
  • Patent number: 9434799
    Abstract: Disclosed are procatalyst compositions having an internal electron donor which include a substituted phenylene aromatic diester and optionally an electron donor component. Ziegler-Natta catalyst compositions containing the present procatalyst compositions exhibit high activity and produce propylene-based olefins with broad molecular weight distribution.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: September 6, 2016
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao
  • Patent number: 9382342
    Abstract: Disclosed herein are catalyst compositions and polymers, i.e., propylene-based polymers, produced therefrom. The present catalyst compositions contain an internal electron donor of an alkoxyalkyl 2-propenoate and optionally a mixed external electron donor. The present catalyst compositions improve catalyst selectivity and polymer stiffness. Polypropylene homopolymer produced from the present catalyst composition has a xylene solubles content less than 4 wt % and a TMF greater than 172.0° C.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: July 5, 2016
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao
  • Patent number: 9382343
    Abstract: Disclosed herein are catalyst compositions and polymers, i.e., propylene-based polymers, produced therefrom. The present catalyst compositions include an internal electron donor with an alkoxypropyl ester. The present catalyst compositions improve catalyst selectivity. Propylene-based polymer produced from the present catalyst composition has a melt flow rate greater than 4 g/10 min.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: July 5, 2016
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao
  • Patent number: 9315592
    Abstract: Disclosed herein are processes for preparing procatalyst compositions with an internal electron donor containing greater than 4.5 wt % of a compounded alkoxyalkyl ester. Also disclosed are catalyst compositions containing the procatalyst composition and polymers, i.e., propylene-based polymers, produced therefrom. The present procatalyst compositions improve catalyst selectivity, catalyst activity, procatalyst morphology and polymer particle morphology, and improve hydrogen response during olefin polymerization.
    Type: Grant
    Filed: April 1, 2013
    Date of Patent: April 19, 2016
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Linfeng Chen, Tak W. Leung, Kelly Gonzalez, Tao Tao
  • Publication number: 20150344597
    Abstract: The present disclosure is directed to the production of substituted phenylene aromatic diesters and 5-tert-butyl-3-methyl-1,2-phenylene dibenzoate (or “BMPD”) in particular. The processes disclosed herein produce a liquid BMPD product. The liquid BMPD product unexpectedly creates production efficiencies by reducing the number of production steps, reducing the amount and/or number of reagents required for BMPD production. The liquid BMPD product may also be utilized in procatalyst production yielding similar production efficiencies. The procatalyst composition is subsequently used for olefin polymerization.
    Type: Application
    Filed: August 7, 2015
    Publication date: December 3, 2015
    Inventors: Michael F. Gullo, Gary A. Roth, Tak W. Leung, Clark C. Williams
  • Publication number: 20150299346
    Abstract: Disclosed are procatalyst compositions having an internal electron donor which include a substituted phenylene aromatic diester and optionally an electron donor component. Ziegler-Natta catalyst compositions containing the present procatalyst compositions exhibit high activity and produce propylene-based olefins with broad molecular weight distribution.
    Type: Application
    Filed: May 28, 2015
    Publication date: October 22, 2015
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao
  • Patent number: 9133286
    Abstract: The present disclosure is directed to the production of substituted phenylene aromatic diesters and 5-tert-butyl-3-methyl-1,2-phenylene dibenzoate (or “BMPD”) in particular. The processes disclosed herein produce a liquid BMPD product. The liquid BMPD product unexpectedly creates production efficiencies by reducing the number of production steps, reducing the amount and/or number of reagents required for BMPD production. The liquid BMPD product may also be utilized in procatalyst production yielding similar production efficiencies. The procatalyst composition is subsequently used for olefin polymerization.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: September 15, 2015
    Assignee: W. R. Grace & Co.-Conn
    Inventors: Michael F. Gullo, Gary A. Roth, Tak W. Leung, Clark C. Williams
  • Patent number: 9045570
    Abstract: Disclosed are procatalyst compositions having an internal electron donor which include a substituted phenylene aromatic diester and optionally an electron donor component. Ziegler-Natta catalyst compositions containing the present procatalyst compositions exhibit high activity and produce propylene-based olefins with broad molecular weight distribution.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: June 2, 2015
    Assignee: W.R. Grace & Co. - Conn.
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao
  • Publication number: 20140163184
    Abstract: Disclosed are procatalyst compositions having an internal electron donor which includes a substituted amide ester and optionally an electron donor component. Ziegler-Natta catalyst compositions containing the present procatalyst compositions exhibit improved catalyst activity and/or improved catalyst selectivity and produce propylene-based olefins with broad molecular weight distribution.
    Type: Application
    Filed: November 8, 2013
    Publication date: June 12, 2014
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao, Kuanqiang Gao, James X. Shu
  • Patent number: 8697827
    Abstract: Disclosed herein are procatalyst compositions, catalyst compositions and polymers, i.e., propylene-based polymers, produced therefrom. The present procatalyst compositions contain a halo-malonate and a 2-fluoro-malonate in particular. The present catalyst compositions improve catalyst selectivity, improve catalyst activity, and also improve hydrogen response during polymerization. Propylene-based polymer produced from the present catalyst composition has a melt flow rate greater than 50 g/10 min.
    Type: Grant
    Filed: February 6, 2013
    Date of Patent: April 15, 2014
    Assignee: W. R. Grace & Co.-Conn
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao
  • Publication number: 20140046009
    Abstract: Disclosed herein are catalyst compositions and polymers, i.e., propylene-based polymers, produced therefrom. The present catalyst compositions contain an internal electron donor of an alkoxyalkyl 2-propenoate and optionally a mixed external electron donor. The present catalyst compositions improve catalyst selectivity and polymer stiffness. Polypropylene homopolymer produced from the present catalyst composition has a xylene solubles content less than 4 wt % and a TMF greater than 172.0° C.
    Type: Application
    Filed: December 2, 2011
    Publication date: February 13, 2014
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao
  • Patent number: 8633126
    Abstract: A solid, hydrocarbon-insoluble, catalyst component useful in polymerizing olefins, said catalyst component containing magnesium, titanium, and halogen, and further containing an internal electron donor having a structure: [R1—O—C(O)—O—]xR2 wherein R1 is independently at each occurrence, an aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 1 to 20 carbon atoms; x is 2-4; and R2 is an aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 1 to 20 carbon atoms, provided that there are from 3 to 4 atoms in the shortest chain connecting a first R1—O—C(O)—O— group and a second R1—O—C(O)—O— group.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: January 21, 2014
    Assignee: Dow Global Technologies LLC
    Inventors: Joseph N. Coalter, III, Tak W. Leung, Tao Tao, Kuanqiang Gao
  • Publication number: 20140012035
    Abstract: Synthesis pathways for a precursor to 5-tert-butyl-3-methyl-1, 2-phenylene dibenzoate are provided. The precursor is methylcatechol and/or 5-tert-butyl-3-methylcatechol.
    Type: Application
    Filed: March 27, 2012
    Publication date: January 9, 2014
    Inventors: Linfeng Chen, Tak W. Leung, Kuanqiang Gao, Tao Tao
  • Publication number: 20140011670
    Abstract: Disclosed are procatalyst compositions having an internal electron donor which include a substituted phenylene aromatic diester and optionally an electron donor component. Ziegler-Natta catalyst compositions containing the present procatalyst compositions exhibit high activity and produce propylene-based olefins with broad molecular weight distribution.
    Type: Application
    Filed: September 10, 2013
    Publication date: January 9, 2014
    Applicant: DOW GLOBAL TECHNOLOGIES LLC
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao
  • Patent number: 8604144
    Abstract: Disclosed are procatalyst compositions having an internal electron donor which includes a substituted amide ester and optionally an electron donor component. Ziegler-Natta catalyst compositions containing the present procatalyst compositions exhibit improved catalyst activity and/or improved catalyst selectivity and produce propylene-based olefins with broad molecular weight distribution.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: December 10, 2013
    Assignee: Dow Global Technologies LLC
    Inventors: Linfeng Chen, Tak W. Leung, Tao Tao, Kuanqiang Gao, James X. Shu