Patents by Inventor James C. Halas

James C. Halas 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).

  • Unsymmetrical diperoxides and processes of use in polymerizing unsaturated monomers
    Patent number: 4219676
    Abstract: Unsymmetrical diperoxides of the general structure: ##STR1## for example, 4-(t-butylperoxycarbonyl)-3-hexyl-6-[7-(tbutylperoxycarbonyl)heptyl] cyclohexene, are useful for polymerizing ethylenically unsaturated monomers (such as styrene). The polymerizations can be carried out at higher temperatures and in shorter times than with conventional initiator systems, without detrimental decrease in polymer molecular weight or significant change in molecular weight distribution. The unsymmetrical diperoxides are also useful as catalysts for curing unsaturated polyester resins.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: August 26, 1980
    Assignee: Pennwalt Corporation
    Inventors: Jose Sanchez, Vasanth R. Kamath, James C. Halas