| 摘要 |
<p>This invention provides a water-dispersed coating composition comprising (1) a dispersion of a water-dispersible form of an acrylic graft polymer containing carboxyl groups and hydroxyl groups, amide groups or mixtures thereof in an aqueous medium containing 60 to 90% by weight of water, said water-disper-sible form being obtained by neutralizing at least 50% of the carboxyl groups of said acrylic graft polymer with a basic substance, and said acrylic graft polymer having an acid value of 15 to 40 and a glass transition temperature of -10.degree.C to 70.degree.C and being produced by polymerizing (A) an acrylic copolymer containing carboxyl groups and unsaturated groups, said acrylic copolymer being obtained by reacting 100 parts by weight of an acrylic polymer having carboxyl groups with 0.2 to 3.0 parts by weight of an unsaturated monomer containing a glycidyl group in a hydrophilic organic solvent, and (B) a mixture of an alpha,beta-ethylenically unsaturated carboxylic acid and another copolymerizable unsaturated monomer, said acrylic copolymer (A) and said mixture (B) being selected such that either one of them has hydroxyl groups, amide groups or mixtures thereof and the difference between the acid value of said acrylic copolymer (A) and that of said mixture (B) is from 25 to 200, and (2) at least one amino resin selected from the group consisting of melamine/formaldehyde resin, urea/formaldehyde resin, guanamine/ formaldehyde resin, benzoguanamine/formaldehyde resin and acetoguanamine/formalde-hyde resin. The present invention also provides a water-dispersed coating compo-sition comprising a dispersion of a water-dispersible form of a self-curable acrylic graft polymer without an amino resin.</p> |
