Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1985-04-23
1986-12-02
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
C25F 304
Patent
active
046263284
ABSTRACT:
Disclosed is a process for electrochemically roughening aluminum or aluminum alloys for use as printing plate supports, in an aqueous mixed electrolyte solution containing hydrochloric acid (HCl) and, as additional electrolytes, at least one organic acid selected from the group consisting of diphosphonic acids, polyphosphonic acids and gallic acid. In particular, the solution contains from 0.5 to 10.0% by weight of HCl and from 0.05 to 5.0% by weight of the organic acid (for example, 1-hydroxy-ethane-1,1-diphosphonic acid). The support materials which are particularly uniformly roughened are employed in the production of offset-printing plates.
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A. J. Dowell, "The Alternating Current Etching of Aluminium Lithographic Sheet", Transactions of the Institute of Metal Finishing, vol. 57, pp. 138-144, 1979.
Chemical Abstracts, vol. 80, Nr. 73548w, p. 186.
Hoechst Aktiengesellschaft
Tufariello T. M.
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