| 摘要 |
PURPOSE:To obtain a written line which can be easily recognized visually but cannot be copied by a copying machine by specifying the color difference between the written line and the surface of an electronic writing board. CONSTITUTION:1-12wt.% orange or yellowish green org. pigment, 55-90wt.% org. solvent (e.g. methanol), 1-30wt.% resin sol. in the org. solvent (e.g. polyvinyl butyral), 1-10wt.% stripping agent (e.g.dibutyl adipate), and, if necessary, an antiseptic agent, a mildewproofing agent, a wetting agent, a viscosity controller, a freezing stabilizer, a defoaming agent, a surfactant, etc., are mixed to give a marking pen ink which is used for an electronic writing board and shows a color difference between a written line and the surface of the board of 30-40NBS. |
