Patents by Inventor Robert Craig Wasson

Robert Craig Wasson 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).

  • Polymers having improved processability
    Patent number: 6255445
    Abstract: Poly(lactones) are provided. The poly(lactones) are obtained by polymerization of a lactone with an initiator system comprising at least one polyfunctional initiator. The poly(lactones) have a shear viscosity at some temperature in the range of from 35 to 45° C. above the melting temperature of the poly(lactone) of at least 6 kPas at 0.1 s−1 shear rate and no greater than 3.5 kPas at 100 s−1 shear rate, and a shear viscosity activation energy of greater than 40 kJ/mol. Preferably, the poly(lactone) is poly(caprolactone).
    Type: Grant
    Filed: April 17, 1998
    Date of Patent: July 3, 2001
    Assignee: Solvay Interox Limited
    Inventors: Amanda Jane Dutton, Robert Craig Wasson, Ivan Lode André Maria Claeys
  • Macromonomer preparation
    Patent number: 5731406
    Abstract: A process for the preparation of macromonomers by reaction between a lactone and a hydroxyalkylacrylate in the presence of >200 ppm phosphoric acid catalyst is provided. The reaction takes place in the presence of a free radical inhibitor at a temperature of from 100.degree. to 130.degree. C. Preferably, the lactone is .epsilon.-caprolactone and the hydroxyalkylacrylate is selected from the group consisting of 2-hydroxyethylacrylate and 2-hydroxyethylmethacrylate.
    Type: Grant
    Filed: June 12, 1996
    Date of Patent: March 24, 1998
    Assignee: Solvay Interox Limited
    Inventor: Robert Craig Wasson