| 摘要 |
PURPOSE:To obtain the title microcapsule stably containing a large amount of a liquid eraser and being useful for obtaining an eraser which does not undergo a decrease in an erasing capability due to volatilization by allowing hollow particles to occlude a liquid eraser and forming films on the surfaces of the hollow particles. CONSTITUTION:Hollow particles (e.g., silica balloons) are allowed to occlude a liquid eraser, desirably, a solvent which can dissolve or swell a vehicle resin of a water-based ink or a drafting ink, for example, a substance containing at least two isocyanate-reactive functional groups (e.g., ethylene glycol) and the hollow particles are added to, for example, a dispersing medium (e.g., cyclohexane). To this dispersion is added an isocyanate compound (e.g., diphenyl diisocyanate) under agitation to form, desirably, a polyurethane film on the surface. In this way, the title microcapsules comprising surface-coated hollow particles occluding the liquid eraser can be obtained. |
