Patents by Inventor Leslie C. Hardy

Leslie C. Hardy 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).

  • Latent, thermal cure accelerators for epoxy-aromatic amine resins having lowered peak exotherms
    Patent number: 5541000
    Abstract: A thermally-curable aromatic amine-epoxy composition comprises(a) at least one polyepoxy compound;(b) a curing amount of at least one aromatic polyamine compound; and(c) a catalytically effective amount of at least one cure accelerator compound which is a .pi.-electron acceptor, and which lowers the cure exotherm peak temperature (as measured by differential scanning calorimetry (DSC) at 10.degree. C. per minute) of the composition by at least about 8 percent relative to the corresponding composition without the cure accelerator. Such accelerator compounds moderate and/or accelerate the thermal curing of aromatic amine-epoxy resins, enabling cure to occur at lower temperatures and/or in shorter time periods than those required for the unaccelerated composition.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: July 30, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Leslie C. Hardy, Wendy L. Thompson