US 7,566,362 B2
Ink, ink jet recording method, ink cartridge, recording unit and ink jet recording apparatus
Otome Mori, Yokohama (Japan); Kuniaki Fujimoto, Chofu (Japan); Yojiro Kojima, Tokyo (Japan); Jun Yoshizawa, Tokyo (Japan); and Daiji Okamura, Yokohama (Japan)
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan)
Filed on Jul. 15, 2008, as Appl. No. 12/173,422.
Claims priority of application No. 2007-210095 (JP), filed on Aug. 10, 2007; and application No. 2008-175247 (JP), filed on Jul. 04, 2008.
Prior Publication US 2009/0047430 A1, Feb. 19, 2009
Int. Cl. C09D 11/02 (2006.01); B41J 2/01 (2006.01)
U.S. Cl. 106—31.48  [106/31.47; 347/100] 13 Claims
OG exemplary drawing
 
1. An ink comprising at least two coloring materials of a first coloring material and a second coloring material, wherein the first coloring material is a compound represented by the following general formula (I), and the second coloring material is a compound represented by the following general formula (II):

OG Complex Work Unit Drawing
wherein A, B, C and D are, independently of one another, an aromatic six-membered ring, M is a hydrogen atom, alkali metal, ammonium or organic ammonium, E is an alkylene group, X is a sulfo-substituted anilino group, carboxyl-substituted anilino group or phosphono-substituted anilino group, with the proviso that such a substituted anilino group may further have 1 to 4 substituents selected from the group consisting of sulfonic, carboxyl, phosphono, sulfamoyl, carbamoyl, hydroxyl, alkoxy, amino, alkylamino, dialkylamino, arylamino, diarylamino, acetylamino, ureido, alkyl, nitro, cyano, alkylsulfonyl and alkylthio groups and halogen atoms, Y is a hydroxyl group or amino group, and l, m and n have the following relationship: 0≤l≤2, 0≤m≤3, 0.1≤n≤3 and l+m+n=1 to 4; and

OG Complex Work Unit Drawing
wherein R1, R2, Y1 and Y2 are, independently of one another, a monovalent group, X1 and X2 are, independently of each other, an electron attractive group having a Hammett's σp value of 0.20 or more, Z1 and Z2 are, independently of each other, a hydrogen atom, substituted or unsubstituted alkyl group, substituted or unsubstituted alkenyl group, substituted or unsubstituted alkynyl group, substituted or unsubstituted aralkyl group, substituted or unsubstituted aryl group, or substituted or unsubstituted heterocyclic group, and M is a hydrogen atom, alkali metal, ammonium or organic ammonium.