C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
101/61, 204/21.5
C25D 11/24 (2006.01) B41N 3/03 (2006.01) C25D 11/20 (2006.01)
Patent
CA 1236045
ABSTRACT OF THE DISCLOSURE The process for manufacturing materials, in the form of sheets, foils or webs, comprised of chemi- cally, 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 vinyl- methylphosphinic acid monomers, such as polyvinylphos- phonic acid. Treatment of the aluminum oxide layer is accomplished by means of immersion and/or electrochemi- cally. Materials prepared by this process are particu- larly useful as supports for offset printing plates, showing an improved resistance to alkali and a reduced tendency to adsorb dyestuff.
474617
Beutel Reiner
Simon Ulrich
Sprintschnik Gerhard
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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