Treating aluminum oxide layer with aqueous hexametaphosphate...

Details Treating aluminum oxide layer with aqueous hexametaphosphate... Treating aluminum oxide layer with aqueous hexametaphosphate...

C - Chemistry, Metallurgy

25

D

204/11.5, 204/21

C25D 11/18 (2006.01) B41N 1/08 (2006.01) B41N 3/03 (2006.01) C25D 11/24 (2006.01)

Patent

CA 1271958

ABSTRACT OF THE DISCLOSURE A process for manufacturing materials in the form of sheets, foils or webs comprising chemically, mechanically and/or electrochemically roughened and anodically oxidized aluminum or one of its alloys, wherein the resultant aluminum oxide layers are post- treated with an aqueous solution containing phosphoroxo anions, is performed such that a post-treatment of the aluminum oxide layers is effected by immersion in an aqueous solution containing hexametaphosphate anion. In a preferred embodiment, the aqueous solution is adjusted to a pH of 1 to 5 by addition of an acid. The resulting materials, which have reduced adsorption pro- perties, are preferably employed as support materials for offset printing plates.

481442

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