Ink composition, ink set, and black ink set

摘要

Disclosed herein is an ink composition, including: a pigment; acetylenediol having an HLB of less than 4; and an anionic surfactant, in which the mass ratio of the acetylene diol to the anionic surfactant is 0.30 to 4.0.

主权项

1. An ink composition configured for use in an ink jet recording apparatus having a nozzle for ejecting the ink composition and a suction cap that seals the nozzle, the suction cap defining a cap space that includes an ink absorber therein, and the cap space is configured to be evacuated when the suction cap seals the nozzle, the ink composition comprising:
a pigment, a content of the pigment being equal to or greater than 5.0 mass %; acetylenediol having an HLB of less than 4, a content of the acetylenediol being 0.010 mass % to 0.40 mass %; a 1,2-alkanediol having 4 to 6 carbon atoms, a content of the 1,2-alkanediol having 4 to 6 carbon atoms being 0.50 mass % to 6.0 mass %; and an anionic surfactant, a content of the anionic surfactant being 0.025 mass % to 0.25 mass %, wherein a mass ratio of the acetylenediol to the anionic surfactant is 0.30 to 4.0, a mass ratio of the acetylenediol to the 1,2-alkanediol is 0.0010 to 0.100, and wherein during evacuation of the suction cap when the suction cap seals the nozzle, the acetylenediol having the HLB of less than 4 reduces the formation of bubbles in the ink composition that collect on the ink absorber.