Water soluble compositions suitable for baked films

Claim 1

A COMPOSITON SUITABLE FOR THE FORMATION OF A HEAT-CURED SURFACE COATING FILM, WHICH COMPOSITON COMPRISES: (A) DISSOLVED HEAT CURABLE RESIN CONSISTING ESSENTIALLY OF A POLYESTER RESIN WHICH IS THE POLYCONDENSATION REACTION PRODUCT OF (A) AN ACIDIC MEMBER SELECTED FROM THE CLASS CONSISTING OF TRIMELLITIC ACID, TRIMELLITIC ANHYDRIDE, HEMIMELLITIC ACID, HEMIMELLITIC ANHYDRIDE AND TRIMESIC ACID, (B) A DIHYDROXYL AFFORDING MATERIAL HAVING ONLY CARBON, HYDROGEN AND OXYGEN ATOMS, AND (C) AN ALKANEDIOIC ACID HAVING 4-10 CARBON ATOMS, THE REACTION SYSTEM CONTAINING ACIDIC MEMBER/DIHYDROXYL/ALKANEDIOIC ACID IN MOLAR RATIO IN THE RANGE OF 2.3-3.5/7/0.0-3.0, THE HYDROXYL GROUP AFFORDING REACTANTS AND CARBOXYL GROUP AFFORDING REACTANTS BEING CONTROLLED TO PROVIDE A MOLAR RATIO HYDROXYL GROUPS/CARBOXYL GROUPS CHARGED TO THE REACTION IN THE RANGE OF 1.05-1.50, AND SAID POLYESTER BEING CHARACTEREIZED BY AN ACID NUMBER OF ABOUT 25-80, (B) DISSOLVED ANTI-CRATERING AGENT WHICH AGENT IS POLYN-VINYL-5-METHYL-2-OXAZOLIDINONE, AND SAID RESIN AND SAID AGENT BEING PRESENT IN A WEIGHT PROPORTION OF ABOUT 98:2 TO ABOUT 75:25, AND (C) WATER IN AN AMOUNT TO DISSOLVE SAID RESIN AND SAID AGENT AND TO IMPART THE DESIRED FLUIDITY TO SAID COMPOSITION, SAID WATER CONTAINING DISSOLVED ALKALINE AGENT SELECTED FROM THE CLASS CONSISTING OF AMMONIA, ALKYL AMINE, HETEROCYCLICAMINE AND ALKANOLAMINE, IN AN AMOUNT SUFFICIENT TO BRING SAID RESIN INTO AQUEOUS SOLUTION AND SAID COMPOSITON KHAVING A PH OF ABOUT 5-8.