Patents Represented by Attorney Bruce S. Brown

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  • Solventless preparation of phthalimides
    Patent number: 6096900
    Abstract: A method for the solventless synthesis of a phthalimide or phthalimide mixture is provided comprising contacting at least one amine reactant and at least one anhydride reactant in a solventless environment at a first temperature sufficient to allow the reactants to at least partially condense; and increasing the temperature to a second temperature sufficient to melt the reaction mixture, thereby allowing the reaction to go essentially to completion and form the reaction product.
    Type: Grant
    Filed: October 15, 1999
    Date of Patent: August 1, 2000
    Assignee: General Electric Company
    Inventors: Robert Joseph Nick, Mark Erik Nelson, Joseph John Caringi, Drew Elliot Williams
  • Phase transfer catalyzed method for prepared oxybisphthalic compounds
    Patent number: 6028203
    Abstract: Oxybisphthalic compounds such as 4,4'-oxybis(N-methylphthalimide) and 4,4'-oxybis(phthalic anhydride) are prepared from the corresponding nitro- or halo-substituted phthalic compounds by reaction with an alkanoate or carbonate salt in a non-polar solvent and in the presence of a hexaalkylguanidinium salt as phase transfer catalyst. A carboxylic acid such as 4-chlorobenzoic acid may be used as an additional catalyst. Reaction rates and yields are higher than with other phase transfer catalysts.
    Type: Grant
    Filed: December 14, 1998
    Date of Patent: February 22, 2000
    Assignee: General Electric Company
    Inventors: Daniel Joseph Brunelle, Thomas Link Guggenheim