Abstract: The thermosetting heat bondable lacquer comprises a solution of a thermosetting mixture of various resins in a solvent or mixture of solvents which boils at a temperature in the range of 50.degree. to 230.degree. C., preferably 130.degree. to 210.degree. C. The thermosetting mixture consists of a polyhydantoin resin, a polyhydroxy polyether or phenoxy resin and a polyurethane resin, each of which must have a pre-determined structure and a pre-determined specific viscosity. The composition of the thermosetting mixture must be within the hatched area in FIG. 1.The thermosetting heat bondable lacquer can be obtained by mixing solutions of the three resin components and can contain auxiliaries and additives and/or catalysts. If the solvent or mixture of solvents is removed from the heat bondable lacquer, e.g.

Abstract: The thermosetting heat bondable lacquer comprises a solution of a thermosetting mixture of various resins in a solvent or mixture of solvents which boils at a temperature in the range of 50.degree. to 230.degree. C., preferably 130.degree. to 210.degree. C. The thermosetting mixture consists of a polyhydantoin resin, a polyhydroxy polyether or phenoxy resin and a polyurethane resin, each of which must have a pre-determined structure and a pre-determined specific viscosity. The composition of the thermosetting mixture must be within the hatched area in FIG. 1.The thermosetting heat bondable lacquer can be obtained by mixing solutions of the three resin components and can contain auxiliaries and additives and/or catalysts. If the solvent or mixture of solvents is removed from the heat bondable lacquer, e.g.