Patents by Inventor Chad A. Strait

Chad A. Strait 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 of improving the oxidative thermal stability of ethylene polymers
    Patent number: 5756659
    Abstract: A method of improving the oxidative thermal stability of ethylene polymers is disclosed. The method comprises removing residual unreacted monomer(s), solvent and thermally unstable species from the molten polymer. The resulting polymer is characterized by having an oxidative exotherm of not more than about 50 percent of the original polymer, as measured by differential scanning calorimetry.
    Type: Grant
    Filed: October 21, 1994
    Date of Patent: May 26, 1998
    Assignee: The Dow Chemical Company
    Inventors: Morgan M. Hughes, Michael E. Rowland, Chad A. Strait
  • Single screw method and apparatus
    Patent number: 5700885
    Abstract: An extruder screw having a plurality of plasticating sections sufficient for plasticating polymeric materials of different bulk density.
    Type: Grant
    Filed: October 27, 1995
    Date of Patent: December 23, 1997
    Assignee: The Dow Chemical Company
    Inventors: Hoang T. Pham, Chad A. Strait, Richard O. Kirk
  • Single screw extruder method and apparatus
    Patent number: 5655835
    Abstract: An extruder screw having a plurality of plasticating sections sufficient for plasticating polymeric materials of different bulk density.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: August 12, 1997
    Assignee: The Dow Chemical Company
    Inventors: Hoang T. Pham, Chad A. Strait, Richard O. Kirk
  • Adhesive, RF heatable grafted polymers and blends
    Patent number: 5089556
    Abstract: Ethylene polymers grafted with dicarboxylic acid functionality have synergistically improved adhesive properties and acquire heatability employing RF electromagnetic radiation when blended with a carbon monoxide-containing ethylene polymer. The dicarboxylic acid grafted and carbon monoxide-containing ethylene polymers and blends thereof are particularly useful as adhesive layers in laminate structures where RF heat sealing methods can be employed.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: February 18, 1992
    Assignee: The Dow Chemical Company
    Inventors: Ricky L. Tabor, Chad A. Strait, Gerald M. Lancaster
  • Meleic anhydride graft copolymers having low yellowness index and films containing the same
    Patent number: 4966810
    Abstract: Maleic anhydride can be satisfactorily grafted to polymers at low pressures by feeding the polymer through a multiple screw extruder and injecting the maleic anhydride and a free radical initiator into the extruder. The maleic anhydride and initiator can be pre-mixed in a solvent solution. The solvent and unreacted maleic anhydride can be removed by low pressure devolatilization. The graft copolymer has a yellowness index as measured by ASTM D-1925-70 less than about 10.0 and as measured by ASTM E-313-73 less than about 11.0. Further, between 0.75 and 2.0 weight percent of the graft copolymer comprises maleic anhydride. The graft copolymer can further be blended with an olefinic polymer to yield adhesive thermoplastics suitable for use as food packaging multilayer coextruded films.
    Type: Grant
    Filed: March 6, 1990
    Date of Patent: October 30, 1990
    Assignee: The Dow Chemical Company
    Inventors: Chad A. Strait, Ricky L. Tabor, Gerald M. Lancaster
  • Maleic anhydride graft copolymers having low yellowness index and films containing the same
    Patent number: 4927888
    Abstract: Maleic anhydride can be satisfactorily grafted to polymers at low pressures by feeding the polymer through a multiple screw extruder and injecting the maleic anhydride and a free radical initiator into the extruder. The maleic anhydride and initiator can be pre-mixed in a solvent solution. The solvent and unreacted maleic anhydride can be removed by low pressure devolatilization. The graft copolymer has a yellowness index as measured by ASTM D-1925-70 less than about 10.0 and as measured by ASTM E-313-73 less than about 11.0. Further, between 0.75 and 2.0 weight percent of the graft copolymer comprises maleic anhydride. The graft copolymer can further be blended with an olefinic polymer to yield adhesive thermoplastics suitable for use as food packaging multilayer coextruded films.
    Type: Grant
    Filed: August 5, 1988
    Date of Patent: May 22, 1990
    Assignee: The Dow Chemical Company
    Inventors: Chad A. Strait, Ricky L. Tabor, Gerald M. Lancaster
  • Method of grafting maleic anhydride to polymers
    Patent number: 4762890
    Abstract: Maleic anhydride can be satisfactorily grafted to polymers at low pressures by feeding the polymer through a co-rotating, twin-screw extruder and injecting the maleic anhydride and a free radical initiator into the extruder. The maleic anhydride and initiator can be pre-mixed in a solvent solution. The solvent and unreacted maleic anhydride can be removed by low pressure devolatilization.
    Type: Grant
    Filed: September 5, 1986
    Date of Patent: August 9, 1988
    Assignee: The Dow Chemical Company
    Inventors: Chad A. Strait, Gerald M. Lancaster, Ricky L. Tabor