Water-soluble resin composition

A water-soluble resin composition comprising a water-soluble resin, a water-soluble crosslinking agent, a surface active agent and a solvent and capable of a crosslinking reaction in the presence of an acid, wherein said surface active agent is at least one member selected from acetylene alcohols, acetylene glycols, acetylene alcohol polyethoxylates, and acetylene glycol polyethoxylates;

• wherein the water-soluble resin is at least one homopolymer or copolymer, containing hydrophilic units, said homopolymer or copolymer being at least one member selected from the group consisting of polyvinyl alcohol (including partially saponified products), polyacrylic acid homopolymer, polymethacrylic acid homopolymer, poly(2-hydroxyethyl acrylate), poly(2-hydroxyethyl methacrylate), poly(4-hydroxybutyl acrylate), poly(4-hydroxybutyl methacrylate), poly(glucosiloxyethyl acrylate), poly(glucosiloxyethyl methacrylate), polyvinyl methyl ether, polyvinyl pyrrolidone, polyethylene glycol, polyvinyl acetal (including partial-acetal products), polyethylene imine, polyethylene oxide, polyvinyl amine, polyallyl amine, oxazoline group-containing water-soluble resin, water-soluble urea resin, alkyd resin, and sulfonamide, as well as salts thereof.