| 摘要 |
<p>An erasable writing medium composition suitable for use in porous tip pens and roller-ball pens is provided. The erasable writing medium comprises an emulsion having a continuous water phase and discontinuous phase that is comprised of a rubber. Pigment particles are exclusively associated with the discontinuous phase. Although the emulsion composition has a very low viscosity, very low surface tension, and very small rubber particle size, it is stable before use. Upon application of the composition to the highly ionic surface of standard stationary-type paper, the emulsion becomes unstable and the rubber agglomerates, and does not penetrate the paper. Upon drying, the pigment remains within the rubber phase thereby preventing the pigment from being absorbed by the writing surface. The rubber phase therefore forms a pigmented layer on the writing surface. The layer can be removed by erasure so that no pigment remains on the writing surface.</p> |
