Method for marking a perfluorocarbon resin surface and composition therefor

Claim 1

THE PROCESS FOR PREPARING AN AQUEOUS DISPERSION INK COMPOSITION FOR MARKING A PERFLUORCARBON RESIN SURFACE WHICH COMPRISES COMBINING AN AQUEOUS SUSPENSOID OF COLLOIDAL PARTICLES OF A PERFLUOROCARBON POLYMER COMPOSITION WHICH IN 100 PARTS INCLUDES AT LEAST 50 PARTS OF AN INTERPOLYMER OF HEXAFLUOROPROPYLENE AND TETRAFLUOROETHYLENE, THE REMAINDER, 0 TO 50 PARTS, BEING POLYTETRAFLUOROETHYLENE, WITH A HEAT-RESISTANT PIGMENT, A WATERDISPERSIBLE, HEAT-REACTIVE SILICONE RESIN IN AN AMOUNT UP TO 50 PARTS PER 100 PARTS OF SAID PERFLUOROCARBON POLYMER, A WATER-IMMISCIBLE VOLATILE LIQUID ORGANIC DILUENT COMPRISING A SOLVENT FOR SAID SILICONE RESIN, AND A DISPERSING AGENT IN THE PRESENCE OF AN AQUEOUS MEDIUM ESSENTIALLY COMPRISING WATER AND AN EFFECTIVE SMALL PROPORTION OF A SUSPENSION STABILIZER HAVING THE PROPERTY OF IMPARTING INCREASED VISCOSITY TO THE AQUEOUS PHASE SUFFICIENT TO INHIBIT PIGMENT SETTLING, SAID DISPERSING AGENT BEING CHARACTERIZED BY A HYDROPHILE/LIPOPHILE BALANCE WHICH FAVORS THE FORMATION OF AN OIL IN WATER DISPERSION, AND UNIFORMLY DISPERSING SAID COLLOIDAL PARTICLES OF PERFLUOROCARBON POLYMER, SAID PIGMENT, SAID SILICONE RESIN AND SAID ORGANIC DILUENT IN THE AQUEOUS MEDIUM AS THE CONTINUOUS PHASE.