Polyamides from reaction of aromatic diacid halide dissolved in cyclic nonaromatic oxygenated organic solvent and an aromatic diamine

Claim 1

A PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT WHOLLY AROMATIC POLYAMIDE COMPRISING REACTING AN AROMATIC DIAMINE WITH AN EQUIMOLAR AMOUNT OF AROMATIC DIACID HALIDE, THE AMINE GROUPS IN THE AROMATIC DIAMINE AND THE ACID HALIDE GROUPS IN THE AROMATIC DIACID HALIDE BEING ATTACHED DIRECTLY TO NON-ADJACENT CARBON ATOMS IN AROMATIC RINGS, USING THE AROMATIC DIAMINE IN AQUEOUS SOLUTION AND THE AROMATIC DIACID HALIDE DISSOLVED IN A CYCLIC NON-AROMATIC OXYGENATED ORGANIC SOLVENT OF THE GROUP CONSISTING OF CYCLIC TETRAMETHYLENE SULFONE, 2,4-DIMETHGYL CYCLIC TETREMATHYLENE SULFONE, TETRAHYDROFURAN, PROPYLENE OXIDE, AND CYCLOHEXANONE, THE REACTION BEING CARRIED OUT BY AGITATING THE AQUEOUS AROMATIC DIAMINE WITH THE SOLUTION OF AROMATIC DIACID HALIDE TO PRODUCE VISIBLE TURBULENCE AT A TEMPERATURE BELOW 100*C. IN THE PRESENCE OF AN ACID ACCEPTOR TO PRODUCE A POLYAMIDE HAVING AN INHERENT VISCOSITY OF AT LEAST 0.6 WHEN DETERMINED IN SOLUTION IN CONCENTRATED SULFURIC ACID AT 30*C AT A CONCENTRATION OF 0.5 GRAM OF POLYMER PER 100 CUBIC CENTIMETERS OF SOLUTION.