Patents by Inventor William J. Shuttleworth

William J. Shuttleworth 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).

  • 2,5-substituted tetrahydrofurans as anionic initiator modifiers
    Patent number: 5385994
    Abstract: A method for improving the initiation efficiency during the anionic polymerization of 15 to 100 percent weight of a vinyl aromatic hydrocarbon monomers and 0 to 85 percent by weight of a conjugated diene monomer by conducting the polymerization in the presence of a catalytically effective amount of: (a) an organolithium initiator and (b) a 2,5-substituted tetrahydrofuran modifier having the structural formula: ##STR1## wherein R.sub.1 and R.sub.1 ' are independently H or an alkyl group containing 1 to 4 carbon atoms and R.sub.2 and R.sub.2 ' are alkyl group containing 1 to 4 carbon atoms.
    Type: Grant
    Filed: October 22, 1993
    Date of Patent: January 31, 1995
    Assignee: Bridgestone Corporation
    Inventors: Daniel F. Graves, James E. Hall, William J. Shuttleworth