Erasable marking medium composition

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 11/16 (2006.01)

Patent

CA 2146978

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.

La présente invention a pour objet une composition d'écriture effaçable pour utilisation dans les stylos à pointe poreuse ainsi que dans les stylos à bille. La composition d'écriture effaçable est composée d'une émulsion ayant une phase aqueuse continue et une phase discontinue à base de caoutchouc. Les particules pigmentaires sont exclusivement associées à la phase discontinue. Bien que la composition émulsifiable possède une très faible viscosité, une très faible tension superficielle, et des particules pigmentaires de très faible diamètre, elle est stable avant son utilisation. Lors de l'application de la composition sur la surface hautement ionique de papier standard, l'émulsion devient instable et le caoutchouc s'agglomère, sans pénétrer le papier. En séchant, le pigment demeure dans la phase caoutchouc, empêchant ainsi le support d'écriture d'absorber le pigment. La phase caoutchouc forme ainsi une couche pigmentée à la surface du support d'écriture. La couche en question peut être enlevée par effaçage pour faire disparaître toute trace de pigment de la surface d'écriture.

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