Ink composition for water-based ballpoint pen
AssigneeMitsubishi Pencil Company, Limited
InventorsAkiko Hirayama, Kousuke Ogura
Life of this patent
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Abstract
An ink composition for a water-based ballpoint pen and a water-based ballpoint pen, which have stable ink flowability even in a so-called fine ballpoint pen, have excellent luster of drawn lines, and do not cause a ball to fall off. The ink composition for a water-based ballpoint pen according to the present invention contains at least an aluminum pigment and 8 to 25 mass % of solid urethane particles with an average particle size of 0.3 to 10 μm. In addition, a water-based ballpoint pen according to the present invention is provided with the ink composition for a water-based ballpoint pen that has the above composition.
Claims17
A water-based ballpoint pen, comprising:
- a ballpoint pen tip having a ball with a ball diameter of 0.5 mm or less;
- and
- an ink composition suitable for a water-based ballpoint pen,
- wherein the ink composition comprises an aluminum pigment, having an average particle size in a range of from 5 to 20 μm, in a range of from 0.1 to 20 mass % and solid urethane particles, having an average particle size in a range of from 0.3 to 10 μm, in a range of from 8 to 25 mass %.
Dependencies are inferred from the claim text.