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US 5,510,397 AGranted
Aqueous pigment ink composition for writing utensils
AssigneeSakura Color Products Corporation
InventorsYasuji Okuda, Hiroaki Ueda
Life of this patent
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Abstract
An aqueous pigment ink composition for writing utensils is provided, which is capable of providing handwritings with good opacifying properties and exhibits little difference in whiteness between handwritings obtained immediately after writing and after drying. When the composition is applied to the inner stick type of writing utensils, an ink having good opacifying properties is passed out. The ink composition comprises, at least, an emulsion of styrene resin-based doughnut-shaped flat particles as a white opacifying agent.
Claims10
An aqueous pigment ink composition for writing utensils, comprising:
- an emulsion of doughnut-shaped, flat styrene comprising resin particles as a white opacifying agent, having an outer diameter of 0.1 to 1.0 .mu.m and a thickness of 1/3 to 2/3 of said outer diameter.
Dependencies are inferred from the claim text.