Ink composition for oil-based ballpoint pen and method for production thereof, and ballpoint pen refill
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United States of America Patent
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Jul 8, 2008
Grant Date -
Jul 20, 2006
app pub date -
Feb 9, 2004
filing date -
Feb 17, 2003
priority date (Note) -
Expired
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Abstract
In order to obtain an ink for oil-based ballpoint pens and an oil-based ballpoint pen which are excellent in handwriting sharpness, handwriting dryness, handwriting and feeling of writing, an ink composition includes an oil-soluble dye, water, an organic solvent whose vapor pressure at 20.degree. C. is 0.5 mmHg or more and which dissolves the water, and an organic solvent whose vapor pressure at 20.degree. C. is 0.1 mmHg or less and which dissolves the organic solvent whose vapor pressure at 20.degree. C. is 0.5 mmHg or more. A total of these three components is 20 to 75% by mass based on an entire mass of the ink composition. A content of the water is 3.0 to 15.0% by mass based on the entire mass of the ink composition. An ink viscosity at 20.degree. C. is 100 to 5,000 mPas. The water and the other components are formulated, mixed and stirred to produce the ink. A ballpoint pen refill with low vapor permeability is used.
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