Method of synthesizing resin prepolymers
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsCarl J. Garvin, Teddy M. Keller
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Abstract
An improved method of synthesizing bisorthodinitriles having the formula: ##STR1## where R is an aliphatic or aromatic radical, which involves dissolving the eactants in a dipolar aprotic solvent such as dimethylformamide, and heating the mixture to reflux until the completion of the reaction. The usage of such solvents permits the reaction to be completed at least ten times as fast as the prior-art method, while the volume of solvent used is also reduced by a factor of ten.
Claims5
In a method for synthesizing phthalonitrile resins prepolymers which comprises admixing 4-aminophthalonitrile with a di-aldehyde in a solvent to form a fluid mixture, heating said mixture to reflux, whereby 4-aminophthalo-nitrile reacts with said di-aldehyde to form said phthalonitrile resin prepolymer, cooling said mixture to precipitate said phthalonitrile resin prepolymer, and separating said phthalonitrile resin prepolymers, the improvement which comprises selecting a dipolar aprotic solvent as said solvent.
Dependencies are inferred from the claim text.