Loading patent…
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorLi-Chen Hsu
Estimating the term…
Triazine compounds and cross-linked polymer compositions are made by heating aromatic nitriles to a temperature in the range of from about 100.degree.0 C. to about 700.degree. C., and preferably in the range of from about 200.degree. C. to about 350.degree. C. in the presence of a catalyst or mixture of catalysts selected from one or more of the following groups: (A) organic sulfonic and sulfinic acids, (B) organic phosphonic and phosphinic acids, and (C) metallic acetylacetonates, at a pressure in the range of from about atmospheric pressure to about 10,000 p.s.i., and preferably in the range of from about 200 p.s.i. to about 750 p.s.i. Aromatic nitrile-modified (terminated and/or appended) imide, benzimidazole, imidazopyrrolone, quinoxaline, and other condensation type prepolymers or their precopolymers are made which are trimerized with or without a filler by the aforementioned catalytic trimerization process into triaryl-s-triazine ring containing or cross-linked polymeric or copolymeric products useful in applications requiring high thermal-oxidative stability and high performance structural properties at elevated temperatures.
A process for preparing an aromatic 1, 3, 5-triazine compound from an aromatic nitrile compound which comprises heating the aromatic nitrile compound to a temperature in the range of from about 100.degree. C. to about 700.degree. C. in the presence of a catalyst consisting essentially of a compound or mixture of compounds from at least one of the following groups:
Dependencies are inferred from the claim text.