Polymeric sanitary coating system

Claim 1

A PROCESS OF COATING A METAL SURFACE COMPRISING THE STEPS OF FILMING ON THE METAL SURFACE A COMPOSITION IN WHICH THE RESIN, OIL AND SOLVENT CONSTITUENTS CONSIST ESSENTIALLY OF (1) COPOLYMER SELECTED FROM COPOLYMERS OF VINYL CHLORIDE AND VINYLIDENE CHLORIDE IN PROPORTIONS OF 30/70 TO 75/25. INCLUSIVE, AND MIXTURES THEREOF,A ND CHARACTERIZED BY COMPLETE SOLUBILITY IN XYLENE AT 25% SOLIDS CONCENTRATION AND BY SPECIFIC VISCOSITY OF SUBSTANTIALLY 0.12 TO 0.30 DETERMINED AT 25*C. IN 0.4% SOLUTION IN NITROBENZENE; (22) SOLVENT OF WHICH AT LEAST 85% CONSISTS OF LIQUID AROMATIC HYDROCARBON MATERIAL HAVING A BOLILING POINT AT LEAST AS HIGH AS BENZENE, THE BALANCE OF THE SOLVENT CONSISTING OF MATERIAL SELECTED FROM THE GROUP CONSISTING OF METHYL ETHYL KETONE, METHYL ISOBUTYL KETONE, CYCLOHEXANONE, ETHYL ACETATE, BUTY PROPIONATE, AND MIXTURES THEREOF; AND (III) AN OLERESINOUS VARNISH BASE WHICH CONSISTS OF DRYING OIL HEATED WITH OIL-SOLUBLE, NON-HEAT HARDENING VARNISH RESIN, WHICH HAS A DRYING OIL/VARNISH RESIN RATIO IN THE RANGE OF 20/80 TO 67/33, INCLUSIVE, AND WHICH IS COMPATIBLE IN SOLUTION IN SAID SOLVENT WITH THE SAID COPOLYMER CONSTITUENT BUT IS CAPABLE OF STRAIFYING TOWARD A METAL SURFACE WHEN THE COMPOSITION IS FILMED ON SAID SURFACE; THE COMBINED SOLIDS CONCENTRATION OF THE COPOLYMER AND OLEORESINOUS VARNISH BASE IN THE SOLVENT BEING IN THE RANGE OF 15 TO 50%, INCLUSIVE, BY WEIGHT, AND THE RATIO OF THE COPOLYMER TO THE OLEORESINOUS VARNISH BASE ON A SOLIDS BASIS BEING IN THE RANGE OF 95/5 TO 10/90, INCLUSIVE; AND BAKING THE FILMED COMPOSITION ON THE METAL SURFACE AT A TEMPERATURE OF AT LEAST 260*F. TO FORM A STRONG, RESISTANT, ADHERENT COATING THEREON.