Process for the two-stage anodic oxidation of aluminum bases for

Details Process for the two-stage anodic oxidation of aluminum bases for Process for the two-stage anodic oxidation of aluminum bases for

1984-07-26

1986-08-19

Niebling, John F.

Stock material or miscellaneous articles

Composite

Of metal

1014631, 204 27, 204 33, 204 383, 204 42, 204 58, 430278, C25D 1112, B41N 104, B41C 110

Patent

active

046069755

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.

REFERENCES:
patent: 3511661 (1970-05-01), Rauner et al.
patent: 3594289 (1971-07-01), Watkinson et al.
patent: 3836437 (1974-09-01), Osada et al.
patent: 3945899 (1976-03-01), Nikaido et al.
patent: 3960676 (1976-06-01), Miyosawa et al.
patent: 4188270 (1980-02-01), Kataoka
patent: 4211619 (1980-07-01), Usbeck

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