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US 12,654,483 B2Granted
Oil-based ballpoint pen
AssigneeKabushiki Kaisha Pilot Corporation
InventorsHironobu Kanbayashi, Hidenori Kudou, Toshihide Kawasaki, Takahiro Joshita
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Abstract
An oil-based ballpoint pen includes: an ink container configured to accommodate an ink composition for the oil-based ballpoint pen, the ink composition containing colorant, alkylene glycol alkyl ether, and polyacrylic resin; and a ballpoint pen tip configured to rotatably hold a ball at one end thereof in an extending direction of the ink container. A ratio of an ink consumption (mg) per writing distance of 100 m to a diameter (mm) of the ball is 30 or more.
Claims15
An oil-based ballpoint pen comprising:
- an ink container configured to accommodate an ink composition for the oil-based ballpoint pen, the ink composition containing colorant, alkylene glycol alkyl ether, polyacrylic resin, and water;
- and
- a ballpoint pen tip configured to rotatably hold a ball at one end thereof in an extending direction of the ink container, wherein
- a ratio of an ink consumption (mg) per writing distance of 100 m to a diameter (mm) of the ball is 30 or more, and
- carboxyl group content in the polyacrylic resin is 40% by mass or more and 80% by mass or less
- wherein a content of the water based on a total amount of the ink composition is 0.1% by mass or more and 20% by mass or less and
- wherein a blending ratio of the water to the polyacrylic resin is 0.1 times or more and 20 times or less on a mass.
4 more elements
Dependencies are inferred from the claim text.