Rinse composition and method for use thereof in electrophotographic printing

Claim 1

IN THE ELECTROPHOTGRAPHIC PREPARATION OF ETCHABLE PHOTOENGRAVING PLATES INCLUDING: (A) PROVIDING A PHOTOCONDUCTIVE COMPOSITION COMPRISING, A PHOTOCONDUCTIVE ZINC OXIDE SUSPENDED IN A CROSS-LINKING RESINOUS INSULATING BINDER COATED ON A METAL PLATE, (B) NEGATIVELY ELECTROSTATICALLY CHARGING SAID COATED PLATE, (C) EXPOSING THE CHARGED PLATE TO AN ILLUMINATED IMAGE TO FORM A LATENT ELECTROSTATIC IMAGE, (D) CONTACTING SAID LATENT IMAGE WITH A CROSS-LINKING PROMOTING CATALYST MATERIAL, (E) RINSING THE PLATE SO-CONTACTED IN A RINSING LIQUID, (F) CURING THE PLATE AT AN ELEVATED TEMPERATURE, (G) REMOVING THE NONIMAGE AREAS, AND (H) CONTACTING THE SO-TREATED PLATE WITH A POWDERLESS ETCHING BATH; THE IMPROVEMENT COMPRISING, RINSING THE CATALYST-CONTACTED PLATE WITH A RINSE COMPOSITION COMPRISING: (1) FROM ABOUT 40 TO ABOUT 50 PARTS BY VOLUME OF A STABLE, LOW TOXICITY, NON-FLAMMABLE FLUORINATED HYDROCARBON LIQUID CHARACTERIZED BY A KAURI- BUTANOL VALUE OF ABOUT 31, AN EVAPORATION RATE OF 170 SECONDS (BASED ON CCL4 BEING 100), A BOILING POINT OF ABOUT 117.63* F., AND A MOLECULAR WEIGHT OF ABOUT 187.39, AND (2) FROM ABOUT 60 TO ABOUT 50 PARTS BY VOLUME OF A HIGH PURITY, LOW TOXICITY, ISOPARAFFINC SOLVENT, HAVING A KAURI- BUTANOL VALUE OF ABOUT 29.0, AN EVAPORATION RATE OF ABOUT 353 SECONDS, AND A FLASH POINT (TCC) OF ABOUT 50*F.