Patents by Inventor Keng-Yu Shih

Keng-Yu Shih 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).

  • Patent number: 7291575
    Abstract: A catalyst composition, and olefin polymerization process using same, formed from a mixture of a non-aluminoxane aluminum compound, an inorganic oxide and a transition metal bidentate or tridentate complex in certain prescribed proportions. The composition can be formed in a single step or in-situ in the polymerization reaction zone. The resultant catalyst has high activity and is capable of producing high molecular weight olefin products without reactor fouling.
    Type: Grant
    Filed: August 5, 2003
    Date of Patent: November 6, 2007
    Inventor: Keng Yu Shih
  • Patent number: 6958375
    Abstract: The present invention is directed to a novel one-step method for forming a supported catalyst complex of high activity by substantially simultaneously contacting a bidentate or tridentate ligand forming compound, a transition metal compound and a chromium immobilized Lewis acid support-agglomerate. The catalyst can be formed prior to polymerization of olefins or within the polymerization reaction zone.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: October 25, 2005
    Assignee: W.R. Grace & Co.-Conn.
    Inventors: Keng-Yu Shih, Dean Alexander Denton, Rimantas Glemza
  • Patent number: 6946420
    Abstract: The present invention is directed to a coordinating catalyst system comprising at least one pre-catalyst selected from late transition metal bidentate or tridentate ligand containing compounds, at least one support-agglomerate having chromium immobilized thereto (e.g., spray dried silica/clay agglomerate), and optionally at least one organometallic compound in controlled amounts, and methods for preparing the same. The resulting catalyst system exhibits enhanced activity for polymerizing olefins and yields polymer products having very good morphology.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: September 20, 2005
    Assignee: W. R. Grace & Co.-Conn
    Inventors: Keng-Yu Shih, Dean Alexander Denton, Rimantas Glemza
  • Patent number: 6943224
    Abstract: A process for forming a coordination catalyst system comprising sequentially or substantially simultaneously contacting: (I) pre-catalyst reactants comprising (a) at least one first ligand-containing reactant; and (b) at least one first transition metal reactant suitable to form at least one metallocene or constrained geometry pre-catalyst compound (e.g., rac-ethylene bis(indenyl)zirconiUm dichloride); an optionally (c) at least one second ligand-containing reactant and (d) at least one second transition metal reactant suitable to form at least one non-metallocene, non-constrained geometry, bidentate or tridentate transition metal compound (e.g., tridentate 2,6-diacetylpyridine-bis(2,4,6-trimethylanaline)FeCl2) and (II) further contacting, jointly or individually, the pre-catalyst compound(s) and optional bidentate or tridentate compound(s) with at least one support-activator agglomerate (e.g., spray dried silica/clay agglomerate).
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: September 13, 2005
    Assignee: W. R. Grace & Co.-Conn.
    Inventor: Keng-Yu Shih
  • Patent number: 6927261
    Abstract: The present invention is directed to a novel one-step method for forming a supported catalyst complex of high activity by substantially simultaneously contacting a bidentate or tridentate ligand forming compound, a transition metal compound and a Lewis acid support-activator agglomerate. The catalyst can be formed prior to polymerization of olefins or within the polymerization reaction zone.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: August 9, 2005
    Assignee: W. R. Grace & Co.-Conn.
    Inventor: Keng-Yu Shih
  • Patent number: 6734131
    Abstract: A chromium containing catalyst wherein the chromium atom is in one of its higher valence states and is immobilized to a support-agglomerate composed of at least one inorganic oxide component and at least one ion-containing layered component.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: May 11, 2004
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Keng-Yu Shih, Dean Alexander Denton, Rimantas Glemza
  • Publication number: 20040029719
    Abstract: A catalyst composition, and olefin polymerization process using same, formed from a mixture of a non-aluminoxane aluminum compound, an inorganic oxide and a transition metal bidentate or tridentate complex in certain prescribed proportions. The composition can be formed in a single step or in-situ in the polymerization reaction zone. The resultant catalyst has high activity and is capable of producing high molecular weight olefin products without reactor fouling.
    Type: Application
    Filed: August 5, 2003
    Publication date: February 12, 2004
    Inventor: Keng Yu Shih
  • Patent number: 6686306
    Abstract: A coordination catalyst system comprising at least one metallocene or constrained geometry pre-catalyst transition metal compound, (e.g., rac-ethylene bis(indenyl)zirconium dichloride), at least one non-metallocene, non-constrained geometry, bidentate transition metal compound or tridentate transition metal compound (e.g., tridentate 2,6-diacetylpyridine-bis(2,4,6-trimethylanaline)FeCl2), at least one support-activator (e.g., spray dried silica/clay agglomerate), and optionally at least one organometallic compound (e.g., triisobutyl aluminum), in controlled amounts, and methods for preparing the same. The resulting dual transition metal catalyst system is suitable for addition polymerization of ethylenically and acetylenically unsaturated monomers into polymers; for example, polymers having a broad molecular weight distribution, Mw/Mn, and good polymer morphology.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: February 3, 2004
    Assignee: W.R. Grace & Co.- Conn.
    Inventor: Keng-Yu Shih
  • Publication number: 20030225225
    Abstract: A coordination catalyst system comprising at least one metallocene or constrained geometry pre-catalyst transition metal compound, (e.g., rac-ethylene bis(indenyl)zirconium dichloride), at least one non-metallocene, non-constrained geometry, bidentate transition metal compound or tridentate transition metal compound (e.g., tridentate 2,6-diacetylpyridine-bis(2,4,6-trimethylanaline)FeCl2) at least one support-activator (e.g., spray dried silica/clay agglomerate), and optionally at least one organometallic compound (e.g., triisobutyl aluminum), in controlled amounts, and methods for preparing the same. The resulting dual transition metal catalyst system is suitable for addition polymerization of ethylenically and acetylenically unsaturated monomers into polymers; for example, polymers having a broad molecular weight distribution, Mw/Mn, and good polymer morphology.
    Type: Application
    Filed: April 10, 2002
    Publication date: December 4, 2003
    Inventor: Keng-Yu Shih
  • Publication number: 20030224927
    Abstract: A process for forming a coordination catalyst system comprising substantially simultaneously contacting: (I) pre-catalyst reactants comprising (a) at least one first ligand; and (b) at least one first transition metal suitable to form at least one metallocene or constrained geometry pre-catalyst compound (e.g., rac-ethylene bis(indenyl)zirconium dichloride); and optionally (c) at least one second ligand and (d) at least one second transition metal suitable to form at least one non-metallocene, non-constrained geometry, bidentate or tridentate transition metal compound (e.g., tridentate 2,6-diacetylpyridine-bis(2,4,6-trimethylanaline)FeCl2); and (II) further contacting, jointly or individually, the pre-catalyst compound(s) and optional bidentate or tridentate compound(s) with at least one support-activator agglomerate (e.g., spray dried silica/clay agglomerate). When individually contacted, the supported catalyst components can be mixed or blended.
    Type: Application
    Filed: April 10, 2002
    Publication date: December 4, 2003
    Inventor: Keng-Yu Shih
  • Publication number: 20030203808
    Abstract: The present invention is directed to a novel one-step method for forming a supported catalyst complex of high activity by substantially simultaneously contacting a bidentate or tridentate ligand forming compound, a transition metal compound and a Lewis acid support-activator agglomerate. The catalyst can be formed prior to polymerization of olefins or within the polymerization reaction zone.
    Type: Application
    Filed: April 10, 2002
    Publication date: October 30, 2003
    Inventor: Keng-Yu Shih
  • Publication number: 20030204032
    Abstract: The present invention is directed to a novel one-step method for forming a supported catalyst complex of high activity by substantially simultaneously contacting a bidentate or tridentate ligand forming compound, a transition metal compound and a chromium immobilized Lewis acid support-agglomerate. The catalyst can be formed prior to polymerization of olefins or within the polymerization reaction zone.
    Type: Application
    Filed: April 10, 2002
    Publication date: October 30, 2003
    Applicant: W.R. Grace & Co.-Conn.
    Inventors: Keng-Yu Shih, Dean Alexander Denton, Rimantas Glemza
  • Publication number: 20030171207
    Abstract: The present invention is directed to a coordinating catalyst system comprising at least one metallocene or constrained geometry pre-catalyst transition metal compound, (e.g., di-(n-butylcyclopentadienyl) zirconium dichloride), at least one support-activator (e.g., spray dried silica/clay agglomerate), and optionally at least one organometallic compound (e.g., triisobutyl aluminum), in controlled amounts, and methods for preparing the same. The resulting catalyst system exhibits enhanced activity for polymerizing olefins and yields polymer having very good morphology.
    Type: Application
    Filed: March 6, 2003
    Publication date: September 11, 2003
    Inventors: Keng-Yu Shih, Dean Alexander Denton, Michael John Carney
  • Publication number: 20030162917
    Abstract: A chromium containing catalyst wherein the chromium atom is in one of its higher valence states and is immobilized to a support-agglomerate composed of at least one inorganic oxide component and at least one ion-containing layered component.
    Type: Application
    Filed: April 10, 2002
    Publication date: August 28, 2003
    Inventors: Keng-Yu Shih, Dean Alexander Denton, Rimantas Glemza
  • Publication number: 20030130111
    Abstract: The present invention is directed to a coordinating catalyst system comprising at least one pre-catalyst selected from late transition metal bidentate or tridentate ligand containing compounds, at least one support-agglomerate having chromium immobilized thereto (e.g., spray dried silica/clay agglomerate), and optionally at least one organometallic compound in controlled amounts, and methods for preparing the same. The resulting catalyst system exhibits enhanced activity for polymerizing olefins and yields polymer products having very good morphology.
    Type: Application
    Filed: April 10, 2002
    Publication date: July 10, 2003
    Inventors: Keng-Yu Shih, Dean Alexander Denton, Rimantas Glemza
  • Publication number: 20030096698
    Abstract: The present invention is directed to a coordinating catalyst system comprising at least one bidentate or tridentate pre-catalyst transition metal compound, (e.g., 2,6-bis (2,4,6-trimethylarylamino) pyridyl iron dichloride), at least one support-activator (e.g., spray dried silica/clay agglomerate), and optionally at least one organometallic compound (e.g., triisobutyl aluminum), in controlled amounts, and methods for preparing the same. The resulting catalyst system exhibits enhanced activity for polymerizing olefins and yields polymer having very good morphology.
    Type: Application
    Filed: April 1, 2002
    Publication date: May 22, 2003
    Applicant: W. R. Grace & Co.-Conn.
    Inventors: Keng-Yu Shih, Michael John Carney, Dean Alexander Denton
  • Patent number: 6559090
    Abstract: The present invention is directed to a coordinating catalyst system comprising at least one metallocene or constrained geometry pre-catalyst transition metal compound, (e.g., di-(n-butylcyclopentadienyl)zirconium dichloride), at least one support-activator (e.g., spray dried silica/clay agglomerate), and optionally at least one organometallic compound (e.g., triisobutyl aluminum), in controlled amounts, and methods for preparing the same. The resulting catalyst system exhibits enhanced activity for polymerizing olefins and yields polymer having very good morphology. The support-activator is a layered material having a negative charge on its interlaminar surfaces and is sufficiently Lewis acidic to activate the transition metal compound for olefin polymerization.
    Type: Grant
    Filed: November 1, 1999
    Date of Patent: May 6, 2003
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Keng-Yu Shih, Dean Alexander Denton, Michael John Carney
  • Patent number: 6399535
    Abstract: The present invention is directed to a coordinating catalyst system comprising at least one bidentate or tridentate ligand containing pre-catalyst transition metal compound, (e.g., 2,6-bis (2,4,6-trimethylarylamino)pyridyl iron dichloride), at least one support-activator (e.g., spray dried silica/clay agglomerate), and optionally at least one organometallic compound (e.g., triisobutyl aluminum), in controlled amounts, and methods for preparing the same. The resulting catalyst system exhibits enhanced activity for polymerizing olefins and yields polymer having very good morphology.
    Type: Grant
    Filed: November 1, 1999
    Date of Patent: June 4, 2002
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Keng-Yu Shih, Michael John Carney, Dean Alexander Denton
  • Patent number: 6184171
    Abstract: A heterogeneous catalyst composition suitable for olefinic polymerization and to methods of forming polyolefinic products using said composition. The catalyst composition comprises an anionic metalloid silane modified inorganic oxide and the cationic remnant of a transition metal bidentate or tridentate compound represented by the formula: T—[—SiR′R″ODM(Q)3]a−n[Cat]b+m wherein each of the symbols above is defined within the subject application.
    Type: Grant
    Filed: October 5, 1998
    Date of Patent: February 6, 2001
    Assignee: W.R. Grace & Co. -Conn
    Inventor: Keng-Yu Shih
  • Patent number: 6087293
    Abstract: A support for use in preparing supported catalysts for addition polymerizations comprising the reaction product of: (A) an inorganic oxide material comprising reactive surface hydroxyl groups, at least some of said hydroxyl groups optionally having been functionalized an converted to a reactive silano moiety corresponding to the formula: --OSiR.sub.2 H, wherein R, independently each occurrence, is hydrogen C.sub.1-20 hydrocarbyl, or C.sub.1-20 hydrocarbyloxy, said inorganic oxide or functionalized derivative thereof comprising less than 1.0 mmol of reactive surface hydroxyl functionality per gram, and (B) an activator compound comprising: b.sub.1) a cation which is capable of reacting with a transition metal compound to form a catalytically active transition metal complex, and b.sub.
    Type: Grant
    Filed: March 2, 1998
    Date of Patent: July 11, 2000
    Assignees: The Dow Chemical Company, W.R. Grace & Co.-Conn.
    Inventors: Edmund M. Carnahan, Michael J. Carney, David R. Neithamer, Peter N. Nickias, Keng-Yu Shih, Lee Spencer