Method of making and improved compositions for an initially erasable ink for a ball point writing instrument
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United States of America Patent
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Oct 4, 1983
Grant Date -
N/A
app pub date -
May 5, 1982
filing date -
May 5, 1982
priority date (Note) -
Expired
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Abstract
An initially erasable ink composition 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 ink composition comprises polar elastomers, such as butadiene/acrylonitrile copolymer rubbers and vinyl acetate/ethylene copolymer rubbers, and mixtures thereof, either alone or in admixture with cis-1, 4-polyisoprene (natural rubber or synthetic nature rubber), pigment, and a solvent system. The polar elastomer is present in the range of about 14-25% by weight of the ink and the pigment is present in amount sufficient to impart color and intensity to a trace of the ink when applied to a substrate such as paper. The solvent system essentially comprises a volatile component having a boiling point less than about 180.degree. C. and an essentially non-volatile component which includes pigment vehicle having a boiling point greater than about 300.degree. C. and low viscosity plasticizer having a boiling point greater than 180.degree. C. but less than 300.degree. C., the solvent system being present in amount sufficient to impart a final ink viscosity in the range of about 1.5 million cps.
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