Erasable black ink composition for ball-point pens
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United States of America Patent
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-
Aug 19, 1986
Issued Date -
N/A
app pub date -
Nov 6, 1984
filing date -
May 31, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An erasable black ink composition for use in ball-point pens is disclosed. The composition comprises rubber, a low boiling solvent, a black pigment, a quality adjuster and a lubricant, wherein the content of the rubber is 18.9 to 20% by weight of the composition, the ratio by weight of the low boiling solvent to the rubber is in the range of 1.56:1 to 1.64:1, the ratio by weight of the pigment to the rubber is in the range of 0.8:1 to 0.9:1, and the ratio by weight of the quality adjuster to the pigment is in the range of 1.7:1 to 1.8:1. Traces of the ink can be erased by a rubber eraser within an initial period of time.
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