Method of producing planographic printing plates
Abstract
Abstract A PHOTOGRAPHIC PRINTING PLATE IS PREPARED FROM A SHEET MATERIAL CARRYING AN EXTERIOR HYDROPHILIC COLLOID LAYER HAVING SUBSTANTIALLY CONCENTRATED AS ITS FREE SURFACE A PATTERN OF FINELY DIVIDED SILVER PARTICLES, BY CONTACTING THE SAME WITH AN AQUEOUS ALKALINE LIQUID FIXER COMPOSITION CONTAINING AN OXIDIZING AGENT FOR SAID SILVER, PARTICLES, E.G. CYANOFERRATE (III)-IONS, AN ORGANIC THIOXO COMPOUND OR TAUTOMER THEREOF FOR CONVERTING THE PATTERN OF SILVER PARTICLES INTO A HYDROPHOBIC INK-RECEPTIVE PATTERN, A HIGHER FATTY ACID, E.G., OLEIC ACID, FOR IMPROVING THE INK-RECEPTIVITY OF SAID PATTERN, AND A WATER-SOLUBLE NITRITE, SUCH AS ALKALI METAL NITRITE OR AN AMMONIUM NITRITE, FOR STABILIZING THE DISPERSION OF THE HIGHER FATTY ACID IN THE FIXED LIQUID.
Inventors
- 👤 Louis Maria De Haes
Bibliographic Details
Claims Analysis
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