Preparing polyester fibers of improved dyeability using aromatic amines

Claim 1

A PROCESS FOR PREPARING POLYESTER FIBERS WHICH CAN BE READILY DYED WITH METALLIZABLE DYES COMPRISING THE FOLLOWING STEPS, (1E FORMING A MIXTURE OF (A) A LINEAR, HIGHLY POLYMERIC, CONDENSATION POLYESTER OF (A) AT LEAST ONE BIFUNCTIONAL DICARBOXYLIC ACID COMPRISING AT LEAST 50 MOLE PERCENT OF AN ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID, 4,4''-SULFONYLDIBENZOIC ACID, 4,4''-BENZOPHENONEDICARBOXULIC ACID, 4,4 ETHYLENEDIOXYDIBENZENE ACID, 4,4''-ETHYLENEDIBENZOIC ACID, 4,4''-DIPHENIC ACID AND TRANS-U,4-CYCLOHEXANEDICARBOXYLIC ACID AND (B) AT LEAST ONE BIFUNCTIONAL GLYCOL CONTAINING FROM 2 TO 12 CARBON ATOMS, SAID POLYESTER BEING FIBER-FORMING AND HAVING A MELTING POINT OF AT LEAST 150*C., WITH (B) A NONMETALIZED AROMATIC COMPOUND HAVING FROM 6 TO 20 CARBON ATOMS AND FROM 1 TO 2 CARBOCYCLIC RINGS, WHICH AROMATIC COMPOUND IS ENTIRELY COMPOSED OF CARBON ATOMS, HYDROGEN ATOMS, AT LEAST ONE AMINO GROUP DIRECTLY CONNNECTED TO A BENZENE RING AND ONLY THOSE OTHER SUBSTITUENTS SELECTED FROM THE GROUP CONSISTING OF (A) HALIDE ATOMS, (B) NITRO RADICALS, (C) ALKOXY RADICALS, (D) CARBONYL RADICALS, (E) HYDROCARBON RADICALS, (F) SULFONUL RADICALS EACH OF WHICH SUBSTITUENTS IS DIRECTLY CONNECTED TO A BENZENE RING, AND (G) HYDROGEN ATOMS, SAID MIXTURE CONTAINING FROM ABOUT 2 TO ABOUT 10% BY WEIGHT OF SAID COMPOUND (B), (2) FROMING A FIBER OF SAID MIXTURE OF (A) AND (B) AND (3) BRINGING SAID FIBER INTO INTIMATE CONTACT WITH AN AQUEOUS SOLUTION OF A WATER-SOLUBLE MORDANT SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF CHROMIUM, COBALT, NICKEL AND COPPER, SAID CONTACT BEING AT A TEMPERATURE OF FROM ABOUT 80*C. UP TO THE BOILING POINT OF SAID AQUEOUS SOLUTION WHEREBY THERE IS FORMED A FIBER WHICH CAN BE READILY DYED WITH A METALLIZABLE DYE, SAID FIBER CONTAINING FROM ABOUT 1% TO ABOUT 10% BASED ON THE WEIGHT OF THE FIBER OF SAID MORDANT SALT.