C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/24.6
C25D 11/12 (2006.01) B41N 3/03 (2006.01)
Patent
CA 1206912
Abstract of the Disclosure The invention relates to a process for manufacturing a support material for offset-printing plates, comprising the step of: subjecting a support member comprising aluminum or an alloy thereof, which has been roughened by chemical, mechanical or elec- trochemical treatment, to a two-stage anodic oxidation treatment including a first stage a) comprising anodic oxidation in an aqueous electrolyte consisting essentially of sulfuric acid and Al3+ ion, so that at least one layer comprising aluminum oxide is deposited on said support member to a layer thickness of about 0.3 to 2.5 microns, and thereafter to a second stage b) comprising anodic oxidation in an aqueous electrolyte which is different from that in stage a) and which consists essentially of (i) an acid com- prising at least one of the oxoanions of carbon, boron, vanadium, molybdenum, and tungsten or (ii) a salt having an alkali metal cation, an alkaline earth metal cation or an ammonium cation, and at least one of said oxoanions at a voltage between 10 and 100 V, at a temperature of from about 10 to 60°C, and for a duration of from about 1 to 60 seconds. The process can be carried out, in a modern belt-type unit, comparatively rapidly, and without great expense, the proportion of the oxide undergoing redissolution is low, preserves the known, positive properties of the oxide layer which are derived from the anodic oxidation in an aqueous H2SO4 solution and enhance the resistance to alkali, of support mate- rials for offset-printing plates based on roughened and anodically oxidized aluminum.
421170
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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