Method of making and the composition for an initially erasable i

Details Method of making and the composition for an initially erasable i Method of making and the composition for an initially erasable i

1981-03-26

1982-09-14

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

8558, 106 22, 106 23, 106 27, 106 28, 106 29, 106 30, 106 32, 260DIG38, 401 17, 401 18, 401 21, 401 34, 524 88, 524143, 524296, 524297, 524383, 524385, 524476, 524571, C09D 1118, C09D 1110, C09D 1108

Patent

active

043496393

ABSTRACT:
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, synthetic 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 elastomer and a solvent system that contains a volatile component and an essentially non-volatile low viscosity component.

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