Process for manufacturing support materials for offset...

Details Process for manufacturing support materials for offset... Process for manufacturing support materials for offset...

C - Chemistry, Metallurgy

25

D

204/24.6

C25D 11/12 (2006.01) B41N 3/03 (2006.01)

Patent

CA 1205418

ABSTRACT OF THE DISCLOSURE The process for manufacturing support materials for offset-printing plates is carried out in two stages. These materials are in the form of plates, foils, or strips, composed of aluminum, or an alloy thereof, which have been roughened by chemical, mechanical and/or electrochemical treatment. These two stages comprise an anodic oxidation in a) an aqueous electrolyte based on sulfuric acid, and in b) an aqueous electrolyte with a content of anions which contain phosphorus. An electrolyte with a content, in solution, of phosphoroxo anions, phosphorofluoro anions, and/or phosphoroxofluoro anions is employed in stage b), and the treatment is carried out at a voltage between about in and 100 V, at a temperature of from about 10 to 80°C, and for a duration of from about 1 to 60 seconds. The electrolyte is, in particular, an oxygen acid of phosphorus, or a salt with the above-mentioned anions. Following stage b), it is also possible to carry out an additional treat- ment to impart hydrophilic properties to the support material.

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