Aqueous ink, ink jet recording method, ink cartridge,...

Details Aqueous ink, ink jet recording method, ink cartridge,... Aqueous ink, ink jet recording method, ink cartridge,...

2007-09-11

2009-08-25

Lorengo, Jerry (Department: 1793)

Compositions: coating or plastic

Coating or plastic compositions

Marking

Reexamination Certificate

active

07578876

ABSTRACT:
The invention provides an aqueous ink that can prevent clogging at an orifice due to drying of the ink though the ink contains a pigment, and can achieve high-level ejection stability required in recent years. The aqueous ink contains 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 ink, a number of carbon black particles having a particle size of 0.5 μm or more and less than 5.0 μm is 1.0×107or 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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