| 摘要 |
PURPOSE:To provide the titled marking ink which produces clear writings on an impermeable writing board and is readily erasable, consisting of a pigment, a solvent-soluble resin, a volatile solvent, a nonionic surfactant made from edible oil and fat and a specified diluent. CONSTITUTION:A pigment or dye, a solvent-soluble resin, a volatile organic solvent, a nonionic surfactant made from edible oil and fat and a small amount of triethanolamine, nonyl phenol, fatty amine or coconut amine are mixed for dispersion. The nonionic surfactant is incompatible with the resin and has a relatively low vapor pressure at around 230 deg.C. It shoud pref. be used in an amount of 5-12% of the ink composition. The volatile organic solvent includes ketones, alcohols, and aromatic solvents and, for better results, two or more of the above solvents are blended. |
