| 摘要 |
The purpose of the invention is to provide a water-based primer having excellent water resistance. The invention is a water-based primer that is an aqueous solution containing an acrylic polymer having an anionic functional group and a cationic functional group; the amount of this acrylic polymer is 15 mass%, and the viscosity at 20°C is less than 800 mPa∙s. |
