| 摘要 |
PROBLEM TO BE SOLVED: To satisfactorily improve the erasing property of a photosensitive layer in a correcting process and to also improve the easiness for fouling of a non-image area. SOLUTION: After an anodic oxide film is formed on an Al or Al alloy sheet, it is treated with an aq. soln. of a compd. having a sulfonic acid group adjusted to pH 3.0-7.0. The compd. having a sulfonic acid group is preferably lignin sulfonic acid or its compd. A layer of a compd. having an amino group or an amine is preferably disposed on a substrate produced by this method. |
