Composition and method for removing hardened silicone resin glazes from metal surfaces

Claim 1

IN A PROCESS FOR REMOVING A HARDENED SILICONE RESIN GLAZE FROM AN ASSOCIATED ARTICLE HAVING A SURFACE CONTAINING TIN WITHOUT APPRECIABLY ATTACKING SAID SURFACE, THE STEPS WHICH COMPRISE CONTACTING THE HARDENED SILICONE RESIN WITH A COMPOSITION CONSISTING ESSENTIALLY BY WEIGHT OF ABOUT .02-5% ALKALI METAL HYDROXIDE, 1-97% BY WEIGHT CHLORINATED HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF METHYLENE CHLORIDE, CARBON TETRACHLORIDE, AND PERCHLORETHYLENE, AND SUBSTANTIALLY THE BALANCE AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF ETHANOL, ISOPROPYL ALCOHOL, N-PROPYL ALCOHOL, N-BUTYL ALCOHOL, ISOBUTYL ALCOHOL, SECONDARY BUTYL ALCOHOL, AMYL ALCOHOL, PROPYLENE GLYCOL, DIPROPYLENE GLYCOL AND TRIPROPYLENE GLYCOL, SAID ALCOHOL BEING CAPABLE OF AND PRESENT IN SUFFICIENT AMOUNT TO DISSOLVE SUBSTANTIALLY ALL OF SAID ALKALI METAL BASE AND TO MIX WITH SAID CHLORINATED HYDROCARBON TO FORM A HOMOGENEOUS LIQUID, MAINTAINING SAID COMPOSITION AT A TEMPERATURE OF ABOUT 55-75* C. FOR A PERIOD SUFFICIENT TO MODIFY THE HARDENED SILICONE RESIN GLAZE, SEPARATING THE AFORESAID COMPOSITION FROM THE ARTICLE, AND RINSING THE SURFACE OF SAID ARTICLE.