C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/11.5, 204/24
C25D 11/12 (2006.01) B41N 1/08 (2006.01) B41N 3/03 (2006.01)
Patent
CA 1228049
ABSTRACT OF THE DISCLOSURE Disclosed is a process for the production of a material in the form of a plate, a foil or a strip, from aluminum or an alloy thereof, which has been chemically, mechanically and/or electrochemically roughened. The process comprises a two-stage oxidation involving a first stage a) which is performed in an aqueous electrolyte having from about 60 to 180 g/l of phosphoric acid, at a temperature of the electrolyte bath of about 47 to 70°C and at a voltage of about 36 to 80 V and a second stage b) which is performed in an aqueous electrolyte having from about 60 to 300 g/l of sulfuric acid, at a temperature of the electrolyte bath of about 30 to 65°C and at a voltage of about 15 to 35 V. Also disclosed is an offset-printing plate, having a radiation-sensitive coating and a support material produced by the process described above.
450525
Niederstatter Walter
Sprintschnik Gerhard
Stroszynski Joachim
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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