Patents Represented by Attorney Davod A. Roth

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  • Iminoimidazolidinedione and parabanic acid polymers containing imide groups
    Patent number: 3933758
    Abstract: Novel iminoimidazolidinedione polymers containing imide groups (hereinafter PIPA-IM) are prepared from mixtures of dianhydrides, hydrogen cyanide and diisocyanates in an appropriate solvent and with an appropriate catalyst. The cyanide ion is an effective catalyst for all of the reactions involved. Hydrolysis of these polymers produces novel parabanic acid polymers containing imide groups (hereinafter PPA-IM).
    Type: Grant
    Filed: October 26, 1973
    Date of Patent: January 20, 1976
    Assignee: Exxon Research and Engineering Company
    Inventor: Tad L. Patton