C - Chemistry – Metallurgy – 25 – F
Patent
C - Chemistry, Metallurgy
25
F
204/11.5, 204/86
C25F 3/04 (2006.01) B41N 3/03 (2006.01)
Patent
CA 1199004
Abstract of the Disclosure This invention pertains to a process for electro- chemically modifying electrochemically roughened alumi- num or aluminum alloy-based support materials for printing plates, in which at least one surface of the material is treated in an aqueous electrolyte, with the roughened material being made the cathode. The process results in an electrochemical removal of material from the sur- face in the order of from 0.1 to 10 g/m2, and is carried out in an aqueous electrolyte which has a pH value in the range from 3 to 11 and includes at least one water-soluble salt in a concentration ranging from 5 g/l up to the saturation limit thereof. The process is appropriately conducted using direct current at a current density from 3 to 100 A/dm2, at a temperature from 15 to 90° C, and for a duration from 5 to 90 seconds. The abrasive modi- fication is optionally followed by an anodic oxidation of the support material and a hydrophilizing post-treatment of the oxide layer. Support materials which have been prepared in this manner are used in the manufacture of offset printing plates carrying a radiation-sensitive coating.
429650
Fraß Werner
Mohr Dieter
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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