| 摘要 |
<p>Aqueous thermosetting varnish compositions that are particularly water resistant after curing are disclosed. These compositions contain by weight (A) about 20-40 percent of a solution copolymer polymerized from monomers consisting essentially of (a) about 50-75 percent vinyl ester of a C,-C<Sub>3</Sub> carboxylic acid, (b) about 10-45 percent of C<Sub>1</Sub>-C<Sub>8</Sub> alkyl acrylate or methacrylate ester and (c) about 5-15 percent of a mixture of (i) at least about 0.5 percent monoethylenically unsaturated C<Sub>3</Sub>-C<Sub>5</Sub> carboxylic acid and (ii) at least about 2 percent C<Sub>2</Sub>-C<Sub>4</Sub> hydroxyalkyl acrylate or methacrylate. The copolymer is polymerized at a temperature of at least 110°C and at a non-volatile solids content of 60-80 percent. Also present in the varnish are (B) about 35-55 percent water, (C) about 7-15 percent water-miscible organic solvent, (D) about 7-15 percent cross-linking agent, and (E) an amount of a volatile amine sufficient to disperse the copolymer in the vehicle provided by the water and water-miscible organic solvent.</p> |
