INK COMPOSITION FOR WATER-BASED BALLPOINT PEN
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United States of America Patent
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Issued Date -
Jun 1, 2023
app pub date -
May 12, 2021
filing date -
May 18, 2020
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Abstract
An ink composition for a water-based ballpoint pen including at least a black pigment and borneol, the black pigment satisfying requirements X to Z below:
- X: 50% particle size (D50) in a cumulative particle size distribution in terms of volume being 0.2 to 1.0 μm,Y: 10% particle size (D10) in a cumulative particle size distribution in terms of volume being 0.1 to 0.3 μm, andZ: 90% particle size (D90) in a cumulative particle size distribution in terms of volume being 1.0 to 5.0 μm.
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