Patents by Inventor Robert N. Webb

Robert N. Webb 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).

  • Production of polyisobutylene copolymers
    Publication number: 20020173612
    Abstract: The invention relates to a new improved catalyst to produce random copolymers of one or more iso-olefin monomers and one or more para-alkylstyrene monomers. The invention also relates to an improved continuous slurry polymerization process to produce random copolymers using the improved catalyst system. The process is carried out in an anhydrous polymerization system containing a mixture of the monomers in a polar solvent along with a Lewis acid and a stabilizing initiator.
    Type: Application
    Filed: May 3, 2002
    Publication date: November 21, 2002
    Inventors: Robert N. Webb, Kenneth W. Powers, Michael F. McDonald, Ralph Howard Schatz
  • Production of polyisobutylene copolymers
    Patent number: 6444768
    Abstract: The invention relates to a new improved catalyst to produce random copolymers of one or more iso-olefin monomers and one or more para-alkylstyrene monomers. The invention also relates to an improved continuous slurry polymerization process to produce random copolymers using the improved catalyst system. The process is carried out in an anhydrous polymerization system containing a mixture of the monomers in a polar solvent along with a Lewis acid and a stabilizing initiator.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: September 3, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Robert N. Webb, Kenneth W. Powers, Michael F. McDonald, Ralph Howard Schatz
  • Halogenation of star-branched butyl rubber with improved neutralization
    Patent number: 5286804
    Abstract: A process for halogenating star-branched butyl rubber is provided wherein water and a wetting agent or wetting agent precursor are added to a solution comprising the star-branched butyl rubber, solid particles of branching agent and an organic solvent prior to the neutralization step to increase the rate of neutralization of the hydrogen halide by-product of the halogenation reaction.
    Type: Grant
    Filed: September 17, 1991
    Date of Patent: February 15, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Kenneth W. Powers, Hsien C. Wang, Robert N. Webb, James V. Fusco, Hans F. Vanbrackle, Michael F. McDonald, Jr.