AQUEOUS LIQUID CONTAINING VINYL-MODIFIED EPOXY RESIN, PROCESS FOR PRODUCING THE SAME, AND WATER-BASED COATING MATERIAL

摘要

An aqueous vinyl-modified epoxy resin composition of the invention comprises: an aqueous composition comprising a modified epoxy resin (A) that is neutralized with a basic compound and dispersed or dissolved in water, wherein the modified epoxy resin (A) is obtained by copolymerizing a polymerizable unsaturated group-containing modified epoxy resin (a) and a vinyl monomer (b) comprising at least a carboxyl group-containing vinyl monomer (b-1), wherein the polymerizable unsaturated group-containing modified epoxy resin (a) is obtained by a reaction among (a-1) an epoxy resin comprising at least an aromatic epoxy resin (a -11), (a-2) a glycidyl group-containing vinyl monomer, and (a-3) an amine, and optionally (a-4) a component capable of reacting with the components (a-1) to (a-3); and a water-miscible crosslinking agent (B). The aqueous vinyl-modified epoxy resin composition of the invention can provide a coating film that has high resistance to harsher environment, such as resistance to brake fluids.