Process for a two-stage hydrophilizing post-treatment of aluminu

Details Process for a two-stage hydrophilizing post-treatment of aluminu Process for a two-stage hydrophilizing post-treatment of aluminu

1985-02-15

1987-08-25

Niebling, John F.

Stock material or miscellaneous articles

Composite

Of silicon containing

204 27, 204 33, 204 383, 204 387, 428451, 428469, 430278, 430302, C25D 1124, B41N 104, B41N 300

Patent

active

046892729

ABSTRACT:
The process for manufacturing materials, in the form of sheets, foils or webs, comprised of chemically, mechanically and/or electrochemically roughened and anodically oxidized aluminum or an aluminum alloy, which process is performed with two hydrophilizing post-treatment steps. In post-treatment step (a) a supported aluminum oxide layer is treated with an aqueous alkali metal silicate solution which optionally contains alkaline earth metal ions, and in step (b) the aluminum oxide layer is separately treated with an aqueous solution containing at least one organic polymer comprised of vinylphosphonic acid and/or vinylmethylphosphinic acid monomers, such as polyvinylphosphonic acid. Treatment of the aluminum oxide layer is accomplished by means of immersion and/or electrochemically. Materials prepared by this process are particularly useful as supports for offset printing plates, showing an improved resistance to alkali and a reduced tendency to adsorb dyestuff.

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