Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1994-06-23
1996-07-09
Szekely, Peter A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524556, 106 20A, 106 22B, 106 23B, 523160, 523161, C08L 908, C08L 3308, C09D 1118
Patent
active
055345875
ABSTRACT:
A color-changeable marking composition well-suited for drawing and coloring activities. In a preferred embodiment, the composition comprises (a) an emulsion, the emulsion having an aqueous continuous phase characterized by a basic pH and a noncarboxylated styrene-butadiene rubber latex discontinuous phase; (b) a pigment insoluble in the aqueous continuous phase of the emulsion; and (c) an acid dye soluble in the aqueous continuous phase of the emulsion, the acid dye having a different color than the water-insoluble pigment. Upon contact with the surface of a conventional porous marking substrate, the emulsion breaks, causing the aqueous continuous phase to be absorbed by the substrate and the rubber latex discontinuous phase to form a cohesive film on the surface of the substrate. The acid dye, because of its solubility in the aqueous continuous phase, is also absorbed by the substrate and cannot readily be removed therefrom. The pigment, because of its insolubility in the aqueous continuous phase, becomes associated with the cohesive film and can easily be removed from the substrate by stripping the cohesive film from the substrate using an ordinary pencil eraser. Accordingly, if the cohesive film is not removed from the substrate, the mark reflects the color contribution of the pigment (or, in some cases, both the pigment and the dye) whereas, if the cohesive film is removed from the substrate, the mark reflects the color contribution of the dye only.
REFERENCES:
patent: 4365035 (1982-12-01), Zabiak
patent: 5389717 (1995-02-01), Santini et al.
Avery Dennison Corporation
Szekely Peter A.
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