Chemistry: electrical and wave energy – Processes and products
Patent
1984-03-30
1986-01-28
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
204 28, 204 33, 204 376, 204 383, 204 58, C25D 1108, C25D 1112, C25D 1116, C25D 1118
Patent
active
045669520
ABSTRACT:
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.degree. to 70.degree. 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.degree. to 65.degree. 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.
REFERENCES:
patent: 3511661 (1970-05-01), Rauner et al.
patent: 3594289 (1971-07-01), Watkinson et al.
patent: 3940321 (1976-02-01), Adams
patent: 4211619 (1980-07-01), Usbeck
patent: 4229266 (1980-10-01), Usbeck
Niderstatter Walter
Sprintschnik Gerhard
Stroszynski Joachim
Hoechst Aktiengesellschaft
Tufariello T. M.
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