| 摘要 |
<p>PURPOSE:To obtain the composition which can form a tough coating film by neutralizing a vinyl polymer made from methyl methacrylate, an acid-group- containing compound, etc., dissolving the neutralized polymer in water and mixing the obtained aqueous solution with a specified aqueous urethane polymer dispersion. CONSTITUTION:A mixture comprising 30-90wt.% methyl methacrylate, 0-30wt.% aromatic vinyl compound especially styrene, 4-20wt.% acid-group-containing vinyl compound especially (meth)acrylic acid and 0-66wt.% other vinyl monomers such as alkyl methacrylate is suspension-polymerized to obtain a vinyl polymer having a Tg of 10-150 deg.C, a specified molecular weight and an acid value of 35-200mgKOH/g, this polymer is neutralized, and the neutralized polymer is dissolved in water to obtain an aqueous solution (A). This solution A is combined with an aqueous urethane polymer dispersion obtained by neutralizing a urethane prepolymer made from an aliphatic or alicyclic diisocyanate, a polyether or an ester diol of a specified molecular weight and an acid-group- containing diol with a tert. amine, and dispersing the neutralized polymer in water in an A/B weight ratio of 5/95 to 95/5 (in terms of the solid content) to obtain the composition for use on an plastic film.</p> |
