| US 7,491,266 B2 | ||
| Black ink and ink set for inkjet recording | ||
| Toshiki Taguchi, Tokyo (Japan); Naotaka Wachi, Shizuoka (Japan); and Manabu Ogawa, Shizuoka (Japan) | ||
| Assigned to FUJIFILM Corporation, Tokyo (Japan) | ||
| Appl. No. 10/578,229 PCT Filed Nov. 04, 2004, PCT No. PCT/JP2004/016697 § 371(c)(1), (2), (4) Date May 04, 2006, PCT Pub. No. WO2005/042652, PCT Pub. Date May 12, 2005. |
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| Claims priority of application No. 2003-374328 (JP), filed on Nov. 04, 2003; and application No. 2004-003813 (JP), filed on Jan. 09, 2004. | ||
| Prior Publication US 2007/0101899 A1, May 10, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. C09D 11/02 (2006.01) | ||
| U.S. Cl. 106—31.27 [106/31.46; 106/31.48; 106/31.5; 106/31.52; 106/31.57] | 12 Claims |
| 1. An ink set for inkjet recording, which comprises at least two black inks having different densities from each other, wherein
the at least two black inks each independently comprises: an aqueous medium; and a dye having a λmax of from 500 nm to 700
nm and a half-band value of 100 nm or more in an absorption spectrum of a diluted solution, the absorption spectrum being
standardized to have an absorbance of 1.0 at the λmax,
wherein
a lower density black ink in the at least two black inks has an ozone fastness stronger than that of a higher density black
ink in the at least two black inks, the higher density black ink having a density higher than that of the lower density black
ink.
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