Baking type resins from benzene tricarboxylic acids

Claim 1

A COMPOSITION CONSISTING ESSENTIALLY OF (A) THE RESIN POLYESTER CONDENSATION REACTION PRODUCT OF (1) A BENZENE TRICARBOXYLIC ACIDIC MEMBER SELECTED FROM THE CLASS CONSISTING OF TRIMELLITIC ACID, TRIMELLITIC ANHYDRIDE, TRIMESIC ACID, HEMIMELLITIC ACID AND HEMIMELLITIC ANHYDRIDE, (2) AN ALKANDOIC ACID CONTAINING FROM 4 TO ABOUT 20 CARBON ATOMS, AND (3) A GLYCOL CONTAINING NOT MORE THAN 12 CARBON ATOMS, WHEREIN THE MOLE RATIO OF TRICARBOXYLIC ACIDIC MEMBER:ALKANDIOIC ACID: GLYCOL IS BETWEEN ABOUT 1:1:2 TO 10:1:25, SAID REACTION BEING CONTINUED UNTIL THE PRODUCT HAS AN ACID NUMBER BETWEEN ABOUT 20 AND ABOUT 100, WHICH RESIN IS CHARACTERIZED BY THE FORMATION OF A THERMOSET SOLID UPON AIRBAKING AT A TEMPERATURE ON THE ORDER OF 400*F., AND (B) ABOUT 0.5-10 WEIGHT PERCENT, BASED ON SAID RESIN A, OF AN AGENT WHICH LOWERS THE THERMOSETTING TEMPERATURE OF SAID RESIN A, WHICH AGENT IS A DIALDEHYDE SELECTED FROM THE CLASS CONSISTING OF ADIPALDEHYDE AND HYDROXYADIPALDEHYDE.