| 摘要 |
<p>PURPOSE:To provide a water based ink which can be written even on oil-stained non-absorptive surfaces such as glass surface and gives, handwriting having excellent fixation and water resistance, by incorporating a betaine type acrylic resin and an ampholytic surfactant in a water ink using an oil dye. CONSTITUTION:A betaine type acrylic resin of the formula (wherein R1 is H, methyl, ethyl; R2, R3 are each methyl, ethyl; R4 is a 1-18C alkyl; l is 2-18; m+n=100-1,000) such as Yuka Former.AM-75#202 (a product of Mitsubishi Yuka Fine K.K.) is used. 0.3-15wt% oil dye such as Bary First Blue 1603(S) (a product of Orient Kagaku Kogyo K.K.), 10-60wt% water-soluble org. solvent having a dielectric constant of 8 or above and a b.p. of 80-300 deg.C, such as gamma- butyrolactone, 10-60wt% water, 0.1-10wt% betaine type acrylic resin and 0.05-3wt% ampholytic surfactant such as Amphitol 24B (a product of Kao Atlas K.K.) are blended together.</p> |
