Inkjet recording apparatus, method for inkjet recording, and ink

An ink comprising:

• a colorant;
• water;
• and
• a water soluble organic solvent,
• wherein the colorant contains a carbon black partially coated with a resin,
• wherein the ink meets the following expressions (1) and (2):
• 1.0×104<N×R/100<1.0×106 (1)
• 20.0<R≦100.0 (2)
• where R (% by mass) denotes a rate of the mass of the carbon black partially coated with a resin relative to the mass of the colorant, and N denotes the number of coarse particles having a particle diameter of 0.5 μm or more per 5 μL of the ink where the number thereof is determined with a number counting method,
• wherein the ink is used for an inkjet recording apparatus including an ink discharging head which is provided with a nozzle having a silicone-containing water-repellent film on a surface thereof on which the ink contacts,
• and further wherein at least one of the following apply:
• an amount of the resin contained in the carbon black partially coated with the resin is 1% by mass to 40% by mass, and
• the R (% by mass) is 35.0<R<95.0.

A method for inkjet recording comprising:

• recording an image using an ink and an ink discharging head configured to discharge the ink,
• wherein the ink discharging head is provided with a nozzle plate having a silicone-containing water-repellent film on a surface thereof on which the ink contacts,
• wherein the ink contains:
• a colorant;
• water;
• and
• a water soluble organic solvent,
• wherein the colorant contains a carbon black partially coated with a resin,
• wherein the ink meets the following expressions (1) and (2):
• 1.0×104<N×R/100<1.0×106 (1)
• 20.0<R≦100.0 (2)
• where R (% by mass) denotes a rate of the mass of the carbon black partially coated with a resin relative to the mass of the colorant, and N denotes the number of coarse particles having a particle diameter of 0.5 μm or more per 5 μL of the ink where the number thereof is determined with a number counting method,
• and further wherein at least one of the following apply:
• an amount of the resin contained in the carbon black partially coated with the resin is 1% by mass to 40% by mass, and
• the R (% by mass) is 35.0<R<95.0.