Patents by Inventor Diane M. Terry

Diane M. Terry 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).

  • Process for producing N-vinyl pyrrolidone polymer having low residual monomer
    Patent number: 5506318
    Abstract: This invention relates to an improved process for the batch polymerization, neat, of a monomer system comprising N-vinyl pyrrolidone monomer utilizing an oil soluble,-thermally activated, free radical initiator. The improvement for reducing the monomer level from about 1 to 2% by weight of the polymerization product to a level below about 0.2 and preferably below about 0.1% by weight of the polymerization reaction product comprises continuously adding an oil soluble azo type free radical generating catalyst to the polymerization reaction product and establishing and maintaining the polymerization reaction product containing residual monomer at a temperature and for a time sufficient to effect substantial polymerization of the residual monomer. Typically the oil soluble, azo type free radical generating catalyst is azobis(isobutyronitrile).
    Type: Grant
    Filed: June 7, 1994
    Date of Patent: April 9, 1996
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Sabrina Wetzel, Roland C. Thorpe, Jr., Diane M. Terry