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

1982-05-07

1983-10-18

Marquis, Melvyn I.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524525, 524575, 401209, B41K 700, C08K 501, B43K 710, C09D 1118

Patent

active

044106432

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 synthetic rubbers not having the chemical structure of natural rubber, with or without cis-1,4-polyisoprene, 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, a non-volatile low viscosity component, and a non-volatile component having a boiling point of 300.degree. or greater.

REFERENCES:
patent: 3875105 (1975-04-01), Daugherty et al.
patent: 4097290 (1978-06-01), Muller et al.
patent: 4297260 (1981-10-01), Feree et al.
patent: 4329262 (1982-05-01), Muller
patent: 4329264 (1982-05-01), Muller
Derwent Abst. 27627E/14, Feb. 1982, J5703173, Mitsubishi Pencil.
Derwent Abst. 06981D/05, Nov. 1981, J55152769, Pilot Pen.
Derwent Abst. 27104E/14, Feb. 1982, J57034170, Mitsubishi Pencil.
Derwent Abst. 55103D/30, Jul. 1981, JJP8101858, Pentel KK.
Derwent Abst. 42733D/24, Apr. 1981, J56043374, Pilot Ink KK.
Derwent Abst. 58013D/32, Jun. 1981, J56076477, Pentel KK.
Derwent Abst. 74849D/41, Aug. 1981, J56109265, Pentel KK.
Chem. Abs. 94(141410), 1981, .intg.Ink Compositions for Ball Point Pens", Pilot Japanese Patent Application 61368/79.

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