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US 8,137,019 B2Granted
Ink composition for writing instrument and writing instrument
AssigneeZebra Co., Ltd.
InventorsMayumi Yamaguchi, Yu Tsukamoto, Akinori Tanaka
Life of this patent
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Abstract
The ink composition for a writing instrument has an aqueous component containing water, a thixotropic agent, a polyhydric alcohol and a pigment, dispersed in an oil component having dyes and non-dye components, wherein the IOB value for all of the dyes in the oil component is no greater than 0.9.
Claims16
An ink composition for a writing instrument, comprising:
- an oil component containing dyes and non-dye components;
- and
- an aqueous component containing water, a thixotropic agent, a polyhydric alcohol and a pigment, dispersed in the oil component,
- wherein the IOB value for all of the dyes in the oil component is no greater than 0.9.
1 more element
Dependencies are inferred from the claim text.