Patents by Inventor Kevin Wayne Lawson

Kevin Wayne Lawson 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).

  • Method for making propylene impact copolymers with balanced impact strength and stiffness
    Patent number: 8076419
    Abstract: Disclosed is a propylene impact copolymer comprising a first polypropylene having an MFR1 within the range from 15 to 40 dg/min; a second polypropylene having an MFR2 within the range from 50 to 190 dg/min; an elastomeric polymer; and wherein the propylene impact copolymer has an MFRICP within the range from 6 to 18 dg/min; a 1% Secant Flexural Modulus of greater than 150 kpsi (1030 MPa); and an Izod Impact at 25° C. of greater than 10 ft-lbs/in (530 J/m). The impact copolymer may be produced in a two or three tandem-reactor system wherein the catalyst composition used in the second reactor to produce the second polypropylene is different from the catalyst composition used in the first reactor to produce the first polypropylene.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: December 13, 2011
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Prasadarao Meka, Kevin Wayne Lawson
  • Method for Making Propylene Impact Copolymers with Balanced Impact Strength and Stiffness
    Publication number: 20110105690
    Abstract: Disclosed is a propylene impact copolymer comprising a first polypropylene having an MFR1 within the range from 15 to 40 dg/min; a second polypropylene having an MFR2 within the range from 50 to 190 dg/min; an elastomeric polymer; and wherein the propylene impact copolymer has an MFRICP within the range from 6 to 18 dg/min; a 1% Secant Flexural Modulus of greater than 150 kpsi (1030 MPa); and an Izod Impact at 25° C. of greater than 10 ft-lbs/in (530 J/m). The impact copolymer may be produced in a two or three tandem-reactor system wherein the catalyst composition used in the second reactor to produce the second polypropylene is different from the catalyst composition used in the first reactor to produce the first polypropylene.
    Type: Application
    Filed: November 10, 2010
    Publication date: May 5, 2011
    Inventors: Prasadarao MEKA, Kevin Wayne Lawson
  • Propylene impact copolymers with balanced impact strength and stiffness
    Patent number: 7851554
    Abstract: Disclosed is a propylene impact copolymer comprising a first polypropylene having an MFR1 within the range from 15 to 40 dg/min; a second polypropylene having an MFR2 within the range from 50 to 190 dg/min; an elastomeric polymer; and wherein the propylene impact copolymer has an MFRICP within the range from 6 to 18 dg/min; a 1% Secant Flexural Modulus of greater than 150 kpsi (1030 MPa); and an Izod Impact at 25° C. of greater than 10 ft-lbs/in (530 J/m). The impact copolymer may be produced in a two or three tandem-reactor system wherein the catalyst composition used in the second reactor to produce the second polypropylene is different from the catalyst composition used in the first reactor to produce the first polypropylene.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: December 14, 2010
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Prasadarao Meka, Kevin Wayne Lawson
  • Reactor systems and polymerization processes using multi-zone circulating reactors
    Patent number: 7816447
    Abstract: The invention relates to the production of polymers using polymerization processes and reactor systems including a plurality of multi-zone circulating reactors. In particular, the invention relates to the production of impact copolymers using reactor systems including a plurality of multi-zone circulating reactors.
    Type: Grant
    Filed: August 23, 2004
    Date of Patent: October 19, 2010
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Kevin Wayne Lawson, Lawrence Carl Smith, Randell Wayne Dickey, Robert Tan Li, Prasadarao Meka
  • Propylene Impact Copolymers With Balanced Impact Strength And Stiffness
    Publication number: 20100105848
    Abstract: Disclosed is a propylene impact copolymer comprising a first polypropylene having an MFR1 within the range from 15 to 40 dg/min; a second polypropylene having an MFR2 within the range from 50 to 190 dg/min; an elastomeric polymer; and wherein the propylene impact copolymer has an MFRICP within the range from 6 to 18 dg/min; a 1% Secant Flexural Modulus of greater than 150 kpsi (1030 MPa); and an Izod Impact at 25° C. of greater than 10 ft-lbs/in (530 J/m). The impact copolymer may be produced in a two or three tandem-reactor system wherein the catalyst composition used in the second reactor to produce the second polypropylene is different from the catalyst composition used in the first reactor to produce the first polypropylene.
    Type: Application
    Filed: October 27, 2008
    Publication date: April 29, 2010
    Inventors: Prasadarao Meka, Kevin Wayne Lawson
  • Multi-donor catalyst system for the polymerization of olefins
    Patent number: 7183234
    Abstract: The present invention provides catalyst systems including a Ziegler-Natta or Ziegler-Natta-type catalyst in combination with a mixture of certain electron donors.
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: February 27, 2007
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Robert Tan Li, Kevin Wayne Lawson, Aspy Keki Mehta, Prasadarao Meka