C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/17
C25D 11/06 (2006.01) B41N 3/03 (2006.01) C25D 11/08 (2006.01)
Patent
CA 1237693
ABSTRACT OF THE DISCLOSURE A process is disclosed for the production of bases for offset printing plates in the form of sheets, foils or webs made of roughened aluminum or one of its alloys, which is carried out in an anodic oxidation stage, i.e. in an aqueous electrolyte which contains phosphorus-containing anions. In the procedure, an electrolyte containing dissolved phosphoroxo anions, with the exception of aqueous H3PO4, is employed, and the treatment is carried out for a period of about 1 to 90 seconds, at a voltage between about 10 and 100 volts and at a temperature of about 10 to 80 °C. The electrolyte is, in particular, a salt of an oxyacid of phosphorus, such as Na3PO4 or K3PO4. Hydrophilization of the base can be carried out additionally after the anodic oxidation. Also dis- closed is a base material produced according to the process and an offset printing plate which includes the base material.
459732
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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