| abstract |
(57) [Summary] [PROBLEMS] A coating film formed using a water-based paint, Increases adhesion to metallic substrates. SOLUTION: An adhesion improver for improving the adhesion of a coating film formed by an aqueous paint applied to a metallic base material includes a solvent substantially insoluble in water, and a phosphate ester dissolved in the solvent. Contains. Here, the solvent is, for example, white kerosene. Phosphate esters have, for example, 6 to 1 carbon atoms. It has eight long-chain alkyl groups and has an acid value of 100 to 100 500. Further, the phosphate ester is dissolved in a solvent at a concentration of 1 to 80% by weight, for example. |