| abstract |
(57) [Abstract] [Problem] There is no decrease in corrosion resistance, the initial coating film hardness is high, Provided is an aqueous vinyl-modified epoxy resin material that is less likely to cause water whitening in a black coating film, and an aqueous coating agent comprising the aqueous vinyl-modified epoxy resin material. SOLUTION: Bisphenol type epoxy resin (1 a), a polymerizable unsaturated group-containing modified epoxy resin (1) obtained by reacting a glycidyl group-containing vinyl monomer (1b) and an amine (1c) with a carboxyl group-containing vinyl monomer (2). The copolymer (A) thus obtained is A vinyl-modified epoxy resin aqueous material characterized by being neutralized by a basic compound and dispersed or dissolved in water, and an aqueous coating agent containing the aqueous material are used. |