Patents Assigned to Daikin Institute of Advanced Chemistry and Technology (Dai-Act)
  • Fluoropolymer-carbon dioxide compositions and methods of processing fluoropolymers
    Patent number: 7115685
    Abstract: Fluoropolymer materials containing tetrafluoroethylene monomers, such as PTFE, are significantly swollen by supercritical carbon dioxide at high temperatures and pressures. The swollen fluoropolymer is processable by molding, extrusion, and other techniques. In addition, the fluoropolymer may be sintered at significantly lower temperatures compared to a nonswollen fluoropolymer material. The melting temperature of fluorinated polymers containing tetrafluoroethylene and triflouroethylene monomers which are swollen with supercritical carbon dioxide is significantly reduced, thereby permitting manufacturing operations such as extruding and molding to be performed at lower temperatures and with reduced risk of decomposition.
    Type: Grant
    Filed: March 22, 2005
    Date of Patent: October 3, 2006
    Assignees: Daikin Institute of Advanced Chemistry and Technology (DAI-ACT), Virginia Commonwealth University
    Inventors: Kenneth Wynne, Takako Ohsaka, legal representative, Suresh Shenoy, Sadashige Irie, Younosuke Ohsaka, deceased
  • Fluoropolymer-carbon dioxide compositions and methods of processing fluoropolymers
    Patent number: 6960633
    Abstract: Fluoropolymer materials containing tetrafluoroethylene monomers, such as PTFE, are significantly swollen by supercritical carbon dioxide at high temperatures and pressures. The swollen fluoropolymer is processable by molding, extrusion, and other techniques. In addition, the fluoropolymer may be sintered at significantly lower temperatures compared to a nonswollen fluoropolymer material. The melting temperature of fluorinated polymers containing tetrafluoroethylene and triflouroethylene monomers which are swollen with supercritical carbon dioxide is significantly reduced, thereby permitting manufacturing operations such as extruding and molding to be performed at lower temperatures and with reduced risk of decomposition.
    Type: Grant
    Filed: October 11, 2002
    Date of Patent: November 1, 2005
    Assignees: Virginia Commonwealth University, Daikin Institute of Advanced Chemistry and Technology (Dai-Act)
    Inventors: Kenneth Wynne, Suresh Shenoy, Sadashige Irie, Takako Ohsaka, Younosuke Ohsaka