| 摘要 |
PROBLEM TO BE SOLVED: To obtain excellent water resistance and recording running properties by incorporating casein or acetoacetyl-modified polyvinyl as adhesive in a recording layer or protective layer, and incorporating ketone resin as crosslinking agent of the adhesive. SOLUTION: Casein or acetoacetyl-modified polyvinyl alcohol is contained as adhesive in a recording layer or protective layer, and ketone resin is contained as crosslinking agent of adhesive. A using amount of the adhesive is about 5 to 40 wt.% to overall solid amount of the recording layer in the recording layer, and about 20 to 99 wt.% to overall solid content amount of the protective layer in the protective layer. A using amount of the ketone resin is preferably about 2 to 30 wt.% to the adhesive. As the polyvinyl alcohol, polyvinyl alcohol having polymerization degree of about 200 to 3000 containing about 0.01 to 10 mol % of acetoacetyl group in a molecule of the alcohol is used. As the ketone resin, condensate of acetone and formaldehyde or the like is used. |
