Chemically resistant coatings and method for preparation thereof

Claim 1

A PROCESS WHICH COMPRISES APPLYING SUCCESSIVELY TO A SUBSTRATE A FIRST, METAL OXIDE FREE, COATING COMPOSITION COMPRISING A POLYMER OF A FLUORINE-CONTAINING OLEFIN HAVING BETWEEN 2 AND 5 CARBON ATOMS AND HAVING AT LEAST ONE ATOM OF A NORMALLY GASEOUS HALOGEN FOR EVERY TWO CARBON ATOMS OF SAID OLEFIN, AND AT LEAST ONE ADHESIVE RESIN SELECTED FROM THE GROUP CONSISTING OF EPOXIDE RESIN AND PHENOLIC RESIN, THE ADHESIVE RESIN-TO-POLYMER RATIO RANGING FROM ABOUT 10:90 TO ABOUT 90:10, AND A SECOND COATING COMPOSITION BEING FREE OF SAID ADHESIVE RESIN AND COMPRISING A METAL OXIDE OF A METAL ABOVE THE FOURTH GROUP OF THE PERIODIC TABLE, SAID METAL HAVING A MELTING POINT BETWEEN 600*C. AND 1500*C., AND A POLYMER OF A FLUORINE-CONTAINING OLEFIN, THE METAL OXIDE-TO-POLYMER RATIO RANGING FROM ABOUT 5:100 TO ABOUT 60:100, AND FINALLY HEATING SAID COATINGS TO A TEMPERATURE BETWEEN ABOUT 420*F. AND ABOUT 600*F. TO PROVIDE A FUSED ADHERENT COATING ON THE SURFACE OF THE SUBSTRATE.