US 11,912,882 B2
Ink set
Tomoki Maruyama, Matsumoto (JP); and Yusuke Mizutaki, Shiojiri (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Sep. 29, 2021, as Appl. No. 17/488,670.
Claims priority of application No. 2020-165270 (JP), filed on Sep. 30, 2020.
Prior Publication US 2022/0098430 A1, Mar. 31, 2022
Int. Cl. C09D 11/40 (2014.01); C08K 5/053 (2006.01); C09D 11/033 (2014.01); C09D 11/328 (2014.01)
CPC C09D 11/40 (2013.01) [C08K 5/053 (2013.01); C09D 11/033 (2013.01); C09D 11/328 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An ink set comprising:
a process color ink set including a yellow ink, a magenta ink, a cyan ink, and a black ink as process color inks; and
a light ink having a color similar to a corresponding one of the process color inks in the process color ink set, wherein
the yellow ink has a maximum absorption wavelength in a range from 350 nm to 480 nm,
the magenta ink has a maximum absorption wavelength in a range from 510 nm to 560 nm,
the cyan ink has a maximum absorption wavelength in a range from 580 nm to 700 nm,
a full width at half maximum of a peak including the maximum absorption wavelength of the yellow ink is in a range from 85 nm to 100 nm,
a full width at half maximum of a peak including the maximum absorption wavelength of the magenta ink is in a range from 85 nm to 100 nm,
a full width at half maximum of a peak including the maximum absorption wavelength of the cyan ink is in a range from 118 nm to 165 nm,
a maximum absorbance in a visible light wavelength range of the light ink is 70% or less of a maximum absorbance in the visible light wavelength range of the corresponding one of the process color inks,
the yellow ink contains a compound represented by the formula (Y-4) or a salt thereof, and
the light ink is a light black ink containing a compound represented by formula (B-1) or a salt thereof in an amount of 0.5% by mass or more relative to a total amount of ink

OG Complex Work Unit Chemistry