Patents by Inventor Virginia A. Dais

Virginia A. Dais 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 molecular weight polysytrene production by vinyl acid catalyzed free radical polymerization
    Patent number: 5990255
    Abstract: The present invention is a free radical bulk polymerization process for the preparation of high molecular weight polymers from vinyl aromatic monomers, characterized in that the polymerization is conducted in the presence of a vinyl acid containing either a sulfur or phosphorus atom within the acid functional group.
    Type: Grant
    Filed: February 23, 1996
    Date of Patent: November 23, 1999
    Assignee: The Dow Chemical Company
    Inventors: Duane B. Priddy, Virginia A. Dais
  • High molecular weight polystyrene production by vinyl acid catalyzed free radical polymerization
    Patent number: 5962605
    Abstract: The present invention is a free radical bulk polymerization process for the preparation of high molecular weight polymers from vinyl aromatic monomers, characterized in that the polymerization is conducted in the presence of a vinyl acid containing either a sulfur or phosphorus atom within the acid functional group.
    Type: Grant
    Filed: February 26, 1997
    Date of Patent: October 5, 1999
    Assignee: The Dow Chemical Company
    Inventors: Duane B. Priddy, Virginia A. Dais
  • Degradable B-alkoxy vinyl ketone resin composition
    Patent number: 5187249
    Abstract: Photodegradable polymers comprising B-alkoxy substituted vinyl ketone functionality and thermoplastic articles formed therefrom.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: February 16, 1993
    Assignee: The Dow Chemical Company
    Inventors: Virginia A. Dais, Duane B. Priddy
  • Photodegradable polymers of furan derivatives
    Patent number: 5164420
    Abstract: Photodegradable polymers comprising substituted furan functionality or ring opened derivatives thereof and thermoplastic articles formed therefrom.
    Type: Grant
    Filed: October 26, 1990
    Date of Patent: November 17, 1992
    Assignee: The Dow Chemical Company
    Inventor: Virginia A. Dais
  • Hydroperoxide catalyzed free radical polymerization of vinyl aromatic monomers
    Patent number: 5115055
    Abstract: High molecular weight polymers of vinyl aromatic monomers are prepared by organic hydroperoxide initiated free radical polymerization in the presence of 5 to 5000 ppm of a soluble organic acid having pKa from 0.5 to 2.5.
    Type: Grant
    Filed: October 29, 1991
    Date of Patent: May 19, 1992
    Assignee: The Dow Chemical Company
    Inventors: Virginia A. Dais, Duane B. Priddy