Automatic Shock-delivery Trip Patents (Class 56/418)
  • Methyl substituted polyimides containing carbonyl and ether connecting groups
    Patent number: 5145942
    Abstract: Novel polyimides have been prepared from the reaction of aromatic diahydrides with novel aromatic diamines having carbonyl and ether groups connecting aromatic rings containing pendant methyl groups. The methyl substituent polyimides exhibit good solubility and form tough, strong films. Upon exposure to ultraviolet irradiation and/or heat, the methyl substituted polyimides crosslink to become insoluble.
    Type: Grant
    Filed: September 28, 1990
    Date of Patent: September 8, 1992
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Paul M. Hergenrother, Stephen J. Havens