US 12,275,857 B2
Inkjet ink set, inkjet recording apparatus, and inkjet recording method
Akinori Koyama, Osaka (JP)
Assigned to KYOCERA Document Solutions Inc., Osaka (JP)
Filed by KYOCERA Document Solutions Inc., Osaka (JP)
Filed on Feb. 23, 2023, as Appl. No. 18/173,653.
Prior Publication US 2024/0287339 A1, Aug. 29, 2024
Int. Cl. C09D 11/40 (2014.01); B41J 2/21 (2006.01); C09D 11/322 (2014.01); C09D 11/38 (2014.01)
CPC C09D 11/40 (2013.01) [B41J 2/2114 (2013.01); C09D 11/322 (2013.01); C09D 11/38 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An inkjet set comprising:
nonwhite ink; and
a white ink, wherein
the nonwhite ink contains a nonwhite pigment, a first polysaccharide, glycol ether, and water,
the white ink contains a white pigment and water,
the nonwhite ink has a first surface tension at 25° C. of at least 30 mN/m and no greater than 40 mN/m,
the first surface tension of the nonwhite ink and a second surface tension at 25° C. of the white ink satisfy formula (1),
the nonwhite ink has a first viscosity at 25° C. of at least 5.0 mPa·s and no greater than 10.0 mPa·s, and
the first viscosity of the nonwhite ink and a second viscosity at 25° C. of the white ink satisfy formula (2):

OG Complex Work Unit Math
where in the formula (1), Tc represents the first surface tension of the nonwhite ink and Tw represents the second surface tension of the white ink, and
in the formula (2), Vc represents the first viscosity of the nonwhite ink and Vw represents the second viscosity of the white ink.