Process for the two-stage anodic oxidation of aluminum bases for offset printing plates and product thereof
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United States of America Patent
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Aug 19, 1986
Grant Date -
N/A
app pub date -
Jul 26, 1984
filing date -
Aug 3, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a base for offset printing plates in the form of a sheet, a foil or a web and a process for producing same which includes the steps of chemically, mechanically and/or electrochemically roughening aluminum or one of its alloys, and forming an oxide layer by means of a two-stage anodic oxidation in (a) an aqueous electrolyte which comprises phosphorus-containing anions and (b) an aqueous electrolyte based on sulfuric acid. A H.sub.3 PO.sub.4 -free electrolyte comprising dissolved phosphoroxo anions is employed in the first stage. Also disclosed are an offset printing plate and a process for producing same.
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