Chemistry: electrical and wave energy – Processes and products
Patent
1985-10-10
1987-03-03
Demers, Arthur P.
Chemistry: electrical and wave energy
Processes and products
204 17, 204 383, 204 33, 204 58, 430270, 430278, 430302, C25D 1112, B41N 108
Patent
active
046473467
ABSTRACT:
In an anodized aluminum support for use in a lithographic printing plate comprising an anodic surface stratum consisting essentially of oxides and phosphates of aluminum; the improvement wherein said surface stratum has an average thickness greater than 0.50 micrometers, is present in a coverage of greater than 600 milligrams per square meter of support, and has a web-like surface structure characterized by the presence of a multiplicity of interlacing filaments having average widths within the range of from about 0.03 to about 0.15 micrometers. The support is prepared by a process of anodically oxidizing at least one surface of an aluminum plate in an aqueous electrolyte, wherein the electrolyte comprises from about 15 to 30% phosphoric acid by weight, and the anodic oxidation is carried out at an anodizing voltage of at least about 50 volts at an electrolyte temperature of from about 25.degree. C. to about 50.degree. C. and at an anodizing condition of at least 2.5 amp.multidot.min/dm.sup.2. A lithographic printing plate comprising a radiation sensitive layer and the above-described support exhibits improved resistance to abrasion.
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"Structural Features of Oxide Coatings on Aluminum," Journal of the Electrochemical Society, vol. 100, No. 9, p. 411, Sep. 1953.
Gilson Richard E.
Miller Gary R.
Demers Arthur P.
Eastman Kodak Company
Lorenzo Alfred P.
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