Patents by Inventor Seldon L. Dotson

Seldon L. Dotson 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).

  • High impact polystyrene containing polyphenylene oxide
    Patent number: 6177512
    Abstract: In the present invention, a process is provided for producing high impact polystyrene of improved heat resistance. According to the invention, after phase inversion of the rubber-polystyrene system, a slurry of PPE in styrene is added in situ to the process. The PPE slurry in styrene contains greater than 15 wt. % of PPE and is introduced to the process at point past rubber phase inversion, preferably at point where total polymer solids is greater than 40 wt. % of the total weight of the polymerization mixture. Preferably, four continuous stirred tank reactors in series are used in the process and preferably the slurry of PPE in styrene monomer is introduced to the third CSTR.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: January 23, 2001
    Assignee: Chevron Chemical Company LLC
    Inventors: Loren K. Gibbons, Chen-Youn Sue, Jeffrey Silloway, Jason J. Miller, Michael J. Hanner, Seldon L. Dotson
  • Vinyl cyanide and vinyl aromatic monomers-grafted nitrile rubber
    Patent number: 5599880
    Abstract: The high nitrile graft copolymer is provided and a high nitrile resin composition impact modified thereby is also provided. Brittle high nitrile resins can be effectively impact modified by the addition of a high nitrile graft copolymer thereto. The high nitrile graft copolymer contains a rubber substrate and a polymeric graft portion superstrate. The substrate contains high levels of diene and amounts of vinyl cyanide and alkylmethacrylate. The polymeric graft portion (superstate) contains high level of vinyl cyanide and a vinyl aromatic hydrocarbon. The high nitrile resin composition is useful as a resin for making chemical resistant high impact molded articles.
    Type: Grant
    Filed: April 8, 1996
    Date of Patent: February 4, 1997
    Assignee: General Electric Company
    Inventor: Seldon L. Dotson
  • Impact modifier for high nitrile resins and impact modified nitrile resin compositions
    Patent number: 5532318
    Abstract: The high nitrile graft copolymer is provided and a high nitrile resin composition impact modified thereby is also provided. Brittle high nitrile resins can be effectively impact modified by the addition of a high nitrile graft copolymer thereto. The high nitrile graft copolymer contains a rubber substrate and a polymeric graft portion superstrate. The substrate contains high levels of diene and amounts of vinyl cyanide and alkylmethacrylate. The polymeric graft portion (superstate) contains high level of vinyl cyanide and a vinyl aromatic hydrocarbon. The high nitrile resin composition is useful as a resin for making chemical resistant high impact molded articles.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: July 2, 1996
    Assignee: General Electric Company
    Inventor: Seldon L. Dotson
  • High impact and low crease stress whitening ABS blends
    Patent number: 5430100
    Abstract: Blends of ABS polymers with different substrate particle sizes are disclosed having a desirable balance of impact resistance, crease stress whitening, and melt viscosity. These compositions are useful in thin guage ABS films.
    Type: Grant
    Filed: March 3, 1994
    Date of Patent: July 4, 1995
    Assignee: General Electric Company
    Inventors: Seldon L. Dotson, Larry B. Simmons