Patents Represented by Attorney Wiliam H. Pittman

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  • Impact modification of polyimides
    Patent number: 5200465
    Abstract: The impact resistance of polyimides is improved by the addition of impact modifiers comprising, as a first stage, an elastomeric polydiorganosiloxane optionally polymerized simultaneously with but separately from one or more vinyl monomers, and as at least one grafted subsequent stage a polymer or copolymer of acrylonitrile, methacrylonitrile, a vinyl aromatic compound, (meth)acrylic acid, alkyl (meth)acrylate or (meth)acrylamide monomer.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: April 6, 1993
    Assignee: General Electric Company
    Inventors: AnnMarie Hellstern, Robert J. Halley, Linda L. Mitchell, I-Chung W. Wang