Phthalonitrile resin from diphthalonitrile monomer and amine
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorTeddy M. Keller
Life of this patent
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Abstract
Phthalonitrile resins useful as high-temperature coatings and plastics and n high-temperature composites are obtained by heating a diphthalonitrile monomer with a primary amine from a temperature from about the melting point of the monomer to about the decomposition temperature of the resin. The resins can also be prepared by dissolving a diphthalonitrile monomer in a solvent, e.g. acetonitrile, adding a primary amine to form a suspension, heating the suspension to the B-stage, quenching the suspension, removing the solvent, and heating the residue at a temperature from about its melting point to about the decomposition temperature of the resin.
Claims29
A phthalontrile resin obtained by admixing a primary amine in an amount from about 1 to about 40 percent of total resin weight with a diphthalonitrile monomer at a temperature from about the melting point of said phthalonitrile monomer to about the decomposition temperature of the resulting resin.
A phthalonitrile resin obtained by forming a solution of a diphthalonitrile monomer;
- admixing said solution with an amount from about 1 to 40 percent of total resin weight of a primary amine having a boiling point and a decomposition temperature of at least about 50.degree. C. in excess of the boiling point of said solution to form a suspension;
- heating said suspension until the B-stage of said resin is reached;
- quenching said B-staged resin;
- removing said solvent by reduced pressure to form a frangible solid;
- and heating said solid, until the C-stage of said resin is reached, at a temperature from at least about the melting point of said solid to about the decomposition temperature of said C-staged phthalonitrile resin.
Dependencies are inferred from the claim text.