| US 7,541,394 B2 | ||
| Water base pigment ink composition for inner lead type writing instrument | ||
| Kazuhiro Kawauchi, Osaka (Japan); and Takeshi Omatsu, Osaka (Japan) | ||
| Assigned to Sakura Color Products Corporation, Osaka-shi (Japan) | ||
| Appl. No. 10/541,932 PCT Filed Dec. 26, 2003, PCT No. PCT/JP03/16904 § 371(c)(1), (2), (4) Date Oct. 07, 2005, PCT Pub. No. WO2004/063297, PCT Pub. Date Jul. 29, 2004. |
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| Claims priority of application No. 2003-003904 (JP), filed on Jan. 10, 2003. | ||
| Prior Publication US 2006/0142418 A1, Jun. 29, 2006 | ||
| Int. Cl. C09D 11/00 (2006.01) | ||
| U.S. Cl. 523—160 [523/161] | 2 Claims |
| 1. Inner lead type writing instruments comprising:
inner leads in which fiber bundles are bundled as ink containers and
pen tips that discharge inks contained in said inner leads and are composed of any one of fibers, plastic leads, brush-like
materials and pen-shaped materials,
wherein said inks do not comprise white colored inorganic pigments or white colored resin particles as coloring materials,
and the content of pigments other than said white colored inorganic pigments or white colored resin particles 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.
|