Patents by Inventor Debra C. Handy

Debra C. Handy 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 rubbery isoolefin polymers
    Patent number: 5182333
    Abstract: A substantially gel free C.sub.4 to C.sub.7 isoolefin homopolymer rubber, butyl copolymer rubber, halogenated butyl rubber (e.g., chlorinated or brominated), or mixtures thereof, comprising a molecular weight distribution such that the ratio of the moments of said molecular weight distribution, Mz/Mw, is equal to or exceeds 2.0, and that portion of said molecular weight distribution which is equal to and greater than 4 times the peak molecular weight, Mp, comprises greater than 8 percent of the total polymer species, and Mp is greater than about 250,000 and wherein said polymer species of molecular weight less than Mp are substantially branch free. Various means are disclosed for effecting the molecular weight distribution including blending of homopolymers and/or copolymers of appropriate molecular weight and molecular weight distribution and direct polymerization using a functional reagent to introduce branching.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: January 26, 1993
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Kenneth W. Powers, Hsien-Chang Wang, Debra C. Handy, James V. Fusco
  • Rubbery isoolefin polymers exhibiting improved processability
    Patent number: 5071913
    Abstract: A substantially gel free C.sub.4 to C.sub.7 isoolefin homopolymer rubber, butyl copolymer rubber, halogenated butyl rubber (e.g., chlorinated or brominated), or mixtures thereof, comprising a molecular weight distribution such that the ratio of the moments of said molecular weight distribution, Mz/Mw, is equal to or exceeds 2.0, and that portion of said molecular weight distribution which is equal to and greater than 4 times the peak molecular weight, Mp, comprises greater than 8 percent of the total polymer species, and Mp is greater than about 250,000 and wherein said polymer species of molecular weight less than Mp are substantially branch free. Various means are disclosed for effecting the molecular weight distribution including blending of homopolymers and/or copolymers of appropriate molecular weight and molecular weight distribution and direct polymerization using a functional reagent to introduce branching.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: December 10, 1991
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Kenneth W. Powers, Hsien-Chang Wang, Debra C. Handy, James V. Fusco