Production of poly-ester-amides

Claim 1

PROCESS FOR THE PRODUCTION OF POLY-ESTERAMIDES BY CONDENSATION OF MORE THAN TWO BIFUNCTIONAL REAGENTS FREE FROM REACTIVE GROUPS OTHER THAN THE TWO FUNCTIONAL GROUPS, INCLUDING 5 TO 50 MOLAR PERCENT OF A SINGLE HIGH-MELTING CONSTITUENT SELECTED FROM THE CLASS CONSISTING OF AROMATIC PRIMARY DIAMINES WHOSE DIACETYL DERIVATIVES DO NOT MELT BELOW 230* C. AND DICARBOXYLIC ACIDS WHOSE DIMETHYL ESTERS DO NOT MELT BELOW 110* C. AND THE AMIDE-FORMING DERIVATIVES OF SUCH ACIDS, THE FUNCTIONAL GROUPS OF SAID REAGENTS BEING MUTUALLY COMPLEMENTARY AND COMPRISING MEMBERS SELECTED FROM EACH OF THE FOLLOWING CLASSES, NAMELY (A) AMINO GROUPS CARRYING HYDROGEN ATOMS, (B) HYDROXY GROUPS AND THEIR ESTER-FORMING DERIVATIVES, AND (C) CARBOXY GROUPS AND THEIR ESTER- AND AMIDE-FORMING DERIVATIVES, COMPRISING FIRST CONDENSING THE REAGENTS OTHER THAN SAID HIGH-MELTING CONSTITUTENT UNTIL THE REACTION MIXTURE FORMED BY MIXING THE LIQUID CONDENSATE WITH THE HIGH-MELTING CONSITITUENT REMAINS HOMOGENEOUS THROUGHOUT SUBSEQUENT CONDENSATION, ADDING THE HIGH-MELTING CONSTITUENT AND COMPLETING THE CONDENSATION, THE CONDENSATION BEING CARRIED OUT SO THAT THE AMINO GROUPS AND THE HYDROXY-GROUPS AND THEIR ESTER-FORMING DERIVATIVES REACT WITH SUBSTANTIALLY EQUIVALENT PROPORTIONS OF THE CARBOXY GROUPS AND THEIR ESTER- AND AMIDE-FORMING DERIVATIVES.