Patents by Inventor Elizabeth A. Benham

Elizabeth A. Benham 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).

  • Linear, very low density polyethylene polymerization process and products thereof
    Patent number: 5274056
    Abstract: A copolymer of ethylene and a higher alpha-olefin, preferably 1-butene and/or 1-hexene, can be produced using an activated and subsequently carbon monoxide reduced chromium containing catalyst system and an alkylaluminum or alkylboron cocatalyst. The polymerization process must be carefully controlled to produce a copolymer resin that can be made into a tough product, with an increased melt index and a broad molecular weight distribution.
    Type: Grant
    Filed: February 4, 1993
    Date of Patent: December 28, 1993
    Assignee: Phillips Petroleum Company
    Inventors: Max P. McDaniel, Elizabeth A. Benham
  • Process for making bimodal polyolefins using two independent particulate catalysts
    Patent number: 5237025
    Abstract: A catalyst mixture is disclosed comprising (1) a particulate chromium-containing catalyst comprising inorganic oxide and chromium and (2) a particular type of particulate titanium-containing catalyst. Also disclosed is the use of this catalyst mixture to produce particularly novel olefin polymers.
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: August 17, 1993
    Assignee: Phillips Petroleum Company
    Inventors: Elizabeth A. Benham, Max P. McDaniel
  • Linear, very low density polyethylene polymerization process and products thereof
    Patent number: 5208309
    Abstract: A copolymer of ethylene and a higher alpha-olefin, preferably 1-butane and/or 1-hexane, can be produced using an activated and subsequently carbon monoxide reduced chromium containing catalyst system and an alkylaluminum or alkylboron cocatalyst. The polymerization process must be carefully controlled to produce a copolymer resin that can be made into a tough product, with an increased melt index and a broad molecular weight distribution.
    Type: Grant
    Filed: January 31, 1992
    Date of Patent: May 4, 1993
    Assignee: Phillips Petroleum Company
    Inventors: Max P. McDaniel, Elizabeth A. Benham
  • Process for olefin polymerization
    Patent number: 5171801
    Abstract: Olefins are polymerized with a catalyst composition which forms on mixing a supported chromium oxide catalyst system and a silane compound. This composition allows the production of one or more comonomers in-situ. The resultant polymer has a lower density, a higher melt index, and a higher high load melt index than polymers produced with a similar catalyst system in the absence of a silane compound.
    Type: Grant
    Filed: November 19, 1990
    Date of Patent: December 15, 1992
    Assignee: Phillips Petroleum Company
    Inventors: Shirley J. Martin, Elizabeth A. Benham, Max P. McDaniel, Bruce W. Gerhold
  • Twice-aged porous inorganic oxides, catalysts, and polymerization processes
    Patent number: 5115053
    Abstract: A silica-titania cogel or silica-titanic-chromium tergel is first aged at a substantially neutral pH, then aged at an alkaline pH, and then spray dried or azeotrope dried to form a xerogel. Optionally, a pore- preserving agent can be added prior to drying. The cogel can be impregnated with a chromium compound. The chromium-containing catalyst is activated by calcination. The activated catalyst can be used as a polymerization catalyst to polymerize mono-1-olefins.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: May 19, 1992
    Assignee: Phillips Petroleum Company
    Inventors: Ronald D. Knudsen, Max P. McDaniel, Elizabeth A. Benham, F. Wallace Bailey
  • High strength linear, low density ethylene copolymer
    Patent number: 5115068
    Abstract: A copolymer of ethylene and a higher alpha-olefin, preferably 1-hexene and/or 4-methyl-1-pentene, can be produced using an activated and subsequently carbon monoxide reduced chromium containing catalyst and a trialkyl boran cocatalyst. The polymerization process must be carefully controlled to produce a copolymer resin that can be made into a tough, impact resistant film.
    Type: Grant
    Filed: August 13, 1990
    Date of Patent: May 19, 1992
    Assignee: Phillips Petroleum Company
    Inventors: Fay W. Bailey, Elizabeth A. Benham, Max P. McDaniel
  • High-temperature slurry polymerization of ethylene
    Patent number: 5071927
    Abstract: This invention relates to a high-temperature slurry polymerization of ethylene where: the hexene is generated in situ; a chromium catalyst system is used; a trialkyl boron or a polyalkyl silane compound is used as a cocatalyst; the temperature of the reaction is above the foul curve temperature for a specific copolymer density; and where the polymerization takes place in a continuous loop reactor which has isobutane as a diluent. Additionally, hexene can be withdrawn, or added, to adjust the density.
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: December 10, 1991
    Assignee: Phillips Petroleum Company
    Inventors: Elizabeth A. Benham, Max P. McDaniel, Robert R. McElvain, Roy O. Schneider
  • Process for olefin polymerization
    Patent number: 4988657
    Abstract: Olefins are polymerized with a catalyst composition which forms on mixing a supported chromium oxide catalyst system and a silane compound. This composition allows the production of one or more comonomers in-situ. The resultant polymer has a lower density, a higher melt index, and a higher high load melt index than polymers produced with a similar catalyst system in the absence of a silane compound.
    Type: Grant
    Filed: October 6, 1989
    Date of Patent: January 29, 1991
    Assignee: Phillips Petroleum Company
    Inventors: Shirley J. Martin, Elizabeth A. Benham, Max P. McDaniel, Bruce W. Gerhold
  • High strength linear, low density polyethylene polymerization process
    Patent number: 4966951
    Abstract: A copolymer of ethylene and a higher alpha-olefin, preferably 1-hexene and/or 4-methyl-1-pentene, can be produced using an activated and subsequently carbon monoxide reduced chromium containing catalyst and a trialkyl boran cocatalyst. The polymerization process must be carefully controlled to produce a copolymer resin that can be made into a tough, impact resistant film.
    Type: Grant
    Filed: September 26, 1988
    Date of Patent: October 30, 1990
    Assignee: Phillips Petroleum Company
    Inventors: Elizabeth Benham, Max P. McDaniel, Fay W. Bailey