Process of making wholly aromatic polyamides

Claim 1

A PROCESS FOR THE PREPARATION OF A POLYAMIDE, AT LEAST 90% OF THE REPEATING UNITS OF WHICH ARE WHOLLY AROMATIC, THE SAID POLYAMIDE HAVING A MELTING POINT OF AT LEAST ABOUT 300*C. AND AN INHERENT VISCOSITY IN CONCENTRATED SULFURIC ACID OF AT LEAST ABOUT 0.6 WHICH COMPRISES (1) CONTACTING, WITH SUFFICIENT AGITATION TO PRODUCEE VISIBLE TURBULENCE AT A TEMPERATURE BELOW ABOUT 100*C. AND IN THE PRESENCE OF A SOLVENT FOR THE MATERIALS CONTACTED, SUBSTANTIALLY EQUIMOLECULAR AMOUNTS OF (A) AN AROMATIC DIAMINE, THE AMINE GROUPS OF WHICH ARE ATTACHED TO NON-ADJACENT CARBOCYCLIC CARBON ATOMS OF THE SAID DIAMINE AND (B) AN AROMATIC DIACID HALIDE, THE ACID HALIDE GROUPS OF WHICH ARE ATTACHED TO NONADJACENT CARBOCYLIC CARBON ATOMS OF THE SAID DIACID HALIDE, THE SAID SOLVENT HAVING AN AVERAGE SOLUTE-SOLVENT INTERACTION ENERGY WITH COMPLEMENTARY MODELS COMPOUNDS REPRESENTATIVE OF THE SAID POLYMER OF LESS THAN ABOUT 1100 CALORIES PER MOLE AND BEING A MEMBER OF THE CLASS CONSISTING OF (I) A HALOGENATED NON-AROMATIC HYDROCARBON CONTAINING AT LEAST ONE HYDROGEN ON CARBON ATTACHED TO HALOGEN, (II) A CYCLIC METHYLENE SULFONE, (III) A COMPOUND OF THE FORMULA