Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1979-11-19
1981-10-27
Michl, Paul R.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 297N, 260 297NE, 260 4221, C08K 517
Patent
active
042972604
ABSTRACT:
An erasable writing medium composition suitable for use in porous tip and ballpoint pens is provided. The erasable writing medium comprises an emulsion having a continuous water phase and discontinuous phase that comprises a styrene-butadiene latex copolymer. The colorant or dye is dissolved in the continuous phase and also is believed to form a surface layer on the discontinuous phase particles. Upon drying, the colorant is captured by the copolymer thereby preventing the colorant from being absorbed by the writing surface.
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Ferree, Jr. William I.
Nguyen Giao V.
Liquid Paper Corporation
Michl Paul R.
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