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AssigneeBrother Kogyo Kabushiki Kaisha
InventorsNarumi Koga, Kazuma Goto, Hiromitsu Sago, Hideo Ohira, Shunichi Higashiyama, Masaya Fujioka
Estimating the term…
A water base ink set for ink-jet recording comprises a black ink which contains a black pigment, water, and a water-soluble organic solvent, and a color ink which contains a dye, water, a water-soluble organic solvent, and at least one compound represented by the following formulas (1) to (3), wherein the nozzle clog-up at an ink-jet head and the malfunction of a purging pump, which would be otherwise caused by the aggregation of the black ink, can be avoided: R1—O—(CH2CH2O)x—SO3.Na (1) wherein R1 represents a straight chain alkyl group having a number of carbon atoms of 16 to 22, and x=20 to 30 is satisfied in the formula (1); 1 wherein l+m+n+o+p+q=20 to 100 is satisfied in the formula (2); and 2 wherein R2 represents a straight chain alkyl group having a number of carbon atoms of 16 to 22, and y=100 to 300 is satisfied in the formula (3).
A water base ink set for ink-jet recording comprising a black ink and a color ink, wherein the black ink contains at least a black pigment, water, and a water-soluble organic solvent, and the color ink contains at least a dye, water, a water-soluble organic solvent, and at least one compound selected from the group consisting of a compound (1) represented by the following formula (1), a compound (2) represented by the following formula (2), and a compound (3) represented by the following formula (3):
An ink-jet recording apparatus comprising:
Dependencies are inferred from the claim text.
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Inkjet printing inks: ink-sets specially adapted for multi-colour inkjet printing
Coating compositions
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1.Field of the Invention
The present invention relates to a water base ink set for ink-jet recording and an ink-jet recording apparatus which accommodates the same.
2. Related Art
An embodiment of the invention will be described in detail with reference to the following figures wherein:
FIG. 1 is a perspective view showing a color ink-jet printer having an ink cartridge which contains ink prepared in examples of the invention;
FIG. 2 is a perspective view of a head unit, with its nozzles facing upward; and
The water base ink set for ink-jet recording of the present invention comprises the black ink and the color ink. The black ink contains at least the black pigment, water, and the water-soluble organic solvent.
The black pigment is dispersed as the coloring agent in the black ink. The black pigment is not specifically limited, and it is possible to use known compounds which are commercially available. In particular, a self-dispersing type black pigment, to which a surface-modifying treatment is applied and in which a hydrophilic anionic functional group such as carboxylate and sulfonate is added to surfaces of pigment particles, is preferably used.
The blending amount of the black pigment in the black ink is preferably 0.1 t 20% by weight, more preferably 0.3 to 15% by weight, and much more preferably 0.5 to 10% by weight as represented by the solid content with respect to the total amount of the ink.