Powderless etching method for magnesium printing plates

Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor

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156 14, 156 18, 252 792, 252 794, B41C 102

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active

039922340

ABSTRACT:
An etching bath for printing plates of magnesium or alloys thereof comprising: aqueous nitric acid; a sulfated fatty acid ester; a first saturated or olefinically unsaturated carboxylic acid which comprises a hydroxy-unsubstituted monocarboxylic acid of from 2 to 6 carbon atoms, or a polycarboxylic or hydroxy substituted monocarboxylic acid of from 2 to 8 carbon atoms; a polyhydric alcohol of from 2 to 10 carbon atoms or an ether derivative thereof; a second saturated or olefinically unsaturated carboxylic acid which comprises at least one hydroxy-unsubstituted monocarboxylic acid of from 8 to 24 carbon atoms; and an alkylarylsulfonate. A concentrated additive comprising all of the foregoing bath ingredients except the aqueous nitric acid, to which water and nitric acid are added to provide a powderless etching bath. A method for etching printing plates of magnesium or alloys thereof using the foregoing bath formulation.

REFERENCES:
patent: 3725158 (1973-04-01), Messerschmidt et al.
patent: 3730899 (1973-05-01), Messerschmidt et al.
patent: 3935118 (1976-01-01), Czier et al.

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