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US 6,275,816 B1Granted
Aqueous ink composition for ball-point pen
AssigneeKotobuki & Co., Ltd.
InventorsKatsuya Hattori, Akio Nakamura, Mikio Morishita
Life of this patent
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Abstract
A aqueous ink for a ball-point pen which is stable over time and has high pigment dispersion stability, includes a pigment, a water-soluble organic solvent, water, xanthane gum of about 0.01 to about 0.2 wt. % and a sodium alginate of about 0.2 to about 0.6 wt. % of a total amount of the ink.
Claims28
An aqueous ink for a ball-point pen, comprising:
- a pigment;
- a water-soluble organic solvent;
- and
- water;
- wherein said aqueous ink comprises xanthane gum of substantially about 0.01 to about 0.2 wt. % and an ionic polysaccharide of substantially about 0.2 to about 0.6 wt. %, other than xanthane gum, in a total amount of the ink.
2 more elements
Dependencies are inferred from the claim text.