Water base pigment ink composition for inner lead type writing instrument
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United States of America Patent
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Jun 2, 2009
Grant Date -
Jun 29, 2006
app pub date -
Dec 26, 2003
filing date -
Jan 10, 2003
priority date (Note) -
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Abstract
A water base pigment ink composition for inner lead type writing instruments do not comprise white colored inorganic pigments or white colored resin particles as coloring materials and the content of pigment is 0.5 to 7 wt %, the content of water-soluble resin is 2 to 10 wt % with respect to the total amount of the ink, and the viscosity is 3.5 to 10 mPa·s.
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