C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
400/3063, 400/90
C09D 11/18 (2006.01) C09D 11/16 (2006.01)
Patent
CA 1145872
B12038 ERASABLE WRITING MEDIUM COMPOSITION ABSTRACT OF THE INVENTION 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 a 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.
362609
Ferree William I. Jr.
Nguyen Giao V.
Mcfadden Fincham
The Gillette Company
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