| US 7,578,876 B2 | ||
| Aqueous ink, ink jet recording method, ink cartridge, recording unit, and ink jet recording apparatus | ||
| Yoshio Nakajima, Yokohama (Japan); Sadayuki Sugama, Tsukuba (Japan); and Shin-ichi Hakamada, Kawasaki (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Sep. 11, 2007, as Appl. No. 11/853,479. | ||
| Application 11/853479 is a continuation of application No. PCT/JP2007/057334, filed on Mar. 26, 2007. | ||
| Claims priority of application No. 2006-082402 (JP), filed on Mar. 24, 2006. | ||
| Prior Publication US 2008/0124481 A1, May 29, 2008 | ||
| Int. Cl. C09D 11/02 (2006.01) | ||
| U.S. Cl. 106—31.65 | 8 Claims |
| 1. An aqueous ink comprising at least water, a water-soluble organic solvent and carbon black particles, the carbon black
particles including carbon black particles having a particle size of 0.5 μm or more, wherein
a proportion made up by the volume of carbon black particles having a particle size of 0.2 μm or more and less than 0.5 μm
is 0.3% or less based on the total volume of all the carbon black particles in the aqueous ink,
a number of carbon black particles having a particle size of 0.5 μm or more and less than 5.0 μm is 1.0×107 or less per mL of the aqueous ink, and
an average particle size value of the carbon black particles is from 0.060 μm or more to 0.130 μm or less.
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