| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an oily ink composition for writing materials, of which a pigment hardly coalesces or precipitates in the ink even after preserving for a long period of time, capable of always forming a good handwriting. <P>SOLUTION: This oily ink composition for writing materials consisting at least of the pigment of which the surface is treated with an acrylic-silicone copolymer, an organic solvent and a resin is provided. The organic solvent is suitably an organic solvent as the main solvent having 5.0 to 50 mmHg (20°C) vapor pressure, e.g. ethyl alcohol, n-propyl alcohol, isopropyl alcohol and propylene glycol monomethyl ether. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
