Epoxy resin-polycarboxylic acid-dicyandiamide reaction products

Claim 1

A PROCESS FOR THE MANUFACTURE OF A RESIN SOLUTION SUITABLE AS RAW MATERIAL FOR MAKING LACQUERS BAKEABLE AT HIGH TEMPERATURES AND YIELD-ING VERY HEAT RESISTANT COATINGS, AND PREPAREDD FROM A RESINOUS DERIVATIVE OF A POLYHYDRIC PHENOL, WHICH DERIVATIVE CONTAINS AT LEAST TWO ETHYLENE OXIDE GROUPS AND IS OBTAINED BY REACTION OF A CHLORHYDRIN SELECTED FROM THE GROUP CONSISTING OF EPICHLORHYDRIN AND DICHLORHYDRIN ON THE POLYHYDRIC PHENOL IN AN ALKALINE MEDIUM, IN WHICH PROCESS A QUANTITY OF THE ETHYLENE OXIDE DERIVATIVE WHICH CONTAINS 1 MOL OF BOUND POLYHYDRIC PHENOL IS HEATED IN THE PRESENCE OF AN ORGANIC SOLVENT FREE FROM CARBOXYL GROUPS (1) WITH FROM ABOUT 1/8 TO AT MOST 6/5 OF ONE EQUIVALENT OF A SUBSTANCE OF THE GROUP CONSISTING OF (A) A POLYBASIC CARBOXYLIC ACID, OF WHICH THE CARBOXYLIC GROUPS ARE SEPARATED FROM ONE ANOTHER BY AT LEAST TWO CARBON ATOMS, AND (B) AN ANHYDRIDE OF SUCH AN ACID, AND (2) WITH ABOUT 0.06 TO 0.6 MOL OF DICYANDIAMIDE AND WHEREIN THE HEATING IS CARRIED OUT ALSO IN THE PRESENCE OF AN ALKYL ETHER OF A FORMALDEHYDE CONDENSATION PRODUCT OF A SUBSTANCE OF THE GROUP CONSISTING OF MELAMINE, UREA, DICYANDIAMIDE AND PHENOL.