Method of removing silver images from aluminum lithographic plat

Details Method of removing silver images from aluminum lithographic plat Method of removing silver images from aluminum lithographic plat

1974-01-04

1976-06-08

Bashore, S. Leon

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

75118P, 101465, 134 4, 134 41, 252145, C23G 112

Patent

active

039619826

ABSTRACT:
A coherent silver image which is bonded to the grained surface of an aluminum lithographic plate having an aluminum oxide layer thereon is transformed into a hydrophilic non-image area by contacting the silver image with a viscous composition comprising an aqueous nitric acid solution of sufficient concentration to rapidly effect the removal of the silver image and thereby expose the aluminum oxide under this image and wherein the viscous composition has a viscosity of at least about 500 centipoises. The preferred viscous composition is a thixotropic composition consisting essentially of (1) an aqueous solution of nitric acid present in an amount between about 35% and 70% by volume based upon the total volume of nitric acid solution, and (2) finely divided inert metal oxide capable of imparting thixotropic properties to the solution.

REFERENCES:
patent: 2476413 (1949-07-01), Heath et al.
patent: 3242857 (1966-03-01), Nadeau
patent: 3248332 (1966-04-01), O'Connor
patent: 3275560 (1966-09-01), Wasserman et al.
patent: 3367806 (1968-02-01), Cullis
patent: 3625908 (1971-12-01), Magin
patent: 3807305 (1974-04-01), Gracia et al.
McCutcheon's Detergents and Emulsifiers, 1968, p. 234.

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