Patents by Inventor James Francis Nangeroni

James Francis Nangeroni 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).

  • Continuous process for the preparation of poly(vinyl acetate) for poly(vinyl alcohol) production
    Patent number: 6054530
    Abstract: An improved process for the continuous production of poly(vinyl alcohol) which involves purifying poly(vinyl acetate) paste exiting from a polymerization reactor and dissolving the substantially pure poly(vinyl acetate) in a hydrolytic alcohol-containing solvent for subsequent saponification to produce poly(vinyl alcohol). Poly(vinyl acetate) paste, containing poly(vinyl acetate), vinyl acetate, and solvent, is heated to a temperature above the glass transition temperature but below a temperature which will degrade the poly(vinyl acetate) and is fed into a flashing area of an extruding devolatilization device. Vinyl acetate and solvent are flashed through vent ports in the flashing area of the devolatilization device and can then be recycled to a polymerization reactor, if desired.
    Type: Grant
    Filed: March 11, 1998
    Date of Patent: April 25, 2000
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Stephen Charles Webb, James Francis Nangeroni, Brian Thomas Carvill, Beth Ann Frey