| 摘要 |
PURPOSE: An ink composition for a white board marker is provided to improve conceal ability and clearness and to be easily separated from a board when a character is removed and to prevent ink after image on the board. CONSTITUTION: A method for preparing an ink composition comprises the steps of: mixing pigment, sizing agent, solvent and dispersing agent at 60°C to obtain an existing ink composition; adding a sizing agent and solvent to the ink composition at 60°C to form a first mixture; and mixing a drying retardant, silicon, dispersing agent, plasticizer and release agent with the first mixture, and stirring the mixture at 60°C for 5 hours so that a viscosity is 20~30 cp. |
