C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
400/1116, 6/115,
C09D 11/18 (2006.01)
Patent
CA 1211579
ABSTRACT OF THE DISCLOSURE A method for making and the composition for an initially erasable ink for a ball point writing instrument which ink is characterized by its initial erasability by ordinary pencil erasers when applied by a ball point writing instrument to an absorbent paper-like writing surface and which thereafter develops permanence. The method includes the steps of: (a) selecting elastomeric material from the group consisting of natural rubbers, synthethic rubbers and mixtures thereof; (b) masticating the selected elastomeric material by subjecting same to high shear stresses; (c) coloring said masticated elastomeric material by forced impregnation of colored pigments into said elastomeric material while subjecting same to further shear stresses; and (d) mixing the pigmented elastomeric material with a solvent system that includes a volatile component and an essentially non-volatile low viscosity component in the form of a hydrocarbon oil, an essential oil, a petroleum derivative, a plasticizer or mixtures thereof to form an erasable ink composition. The ink composition comprises a pre-pigmented elastomers and a solvent system that contains a volatile component and an essentially non-volatile low viscosity component.
398630
Meredith & Finlayson
Scripto Inc.
LandOfFree
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