C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/24.7
C25D 11/10 (2006.01) B41N 3/03 (2006.01) C25D 11/06 (2006.01) C25D 11/12 (2006.01)
Patent
CA 1190509
ABSTRACT OF THE DISCLOSURE A process is disclosed for anodically oxidizing materials in the form of sheets, foils or strips, comprising aluminum or aluminum alloys, in an aqeuous electrolyte which contains at least 0.05% by weight of at least one acid, if appropriate after a foregoing mechanical, chemical and/or electro- chemical roughening, in which, the said acid or acidic ester is selected from the group conisting of phytic acid, nitrilo triacetic acid, phosphoric acid mono(dodecyloxypolyoxyethlene) ester, tridecyl benzene sulfonic acid, dinitro- stilbene disulfonic acid, dodecyl naphthalene disulfonic acid, dinonyl naphthalene disulfonic acid, di-n-butyl naphthalene disulfonic acid, ethylene diamine tetraacetic acid, hydroxyethyl ethylene diamine triacetic acid or a mixture of at least two of said acids is used. The resulting anodized and sealed metal sheets have good corrosion resistance and are especially suitable for lithography. Lithographic plates made in accordance with this invention exhibit improved adhesion for light sensitive coatings, improved run length, lessened wear on the press, greater shelf life and improved hydrophilicity in non-image areas.
386627
Gillich Thomas N.
Rozell William J.
Walls John E.
Wanat Stanley F.
American Hoechst Corporation
Fetherstonhaugh & Co.
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