US 12,351,724 B2
Ink set, and method for producing laminate
Manabu Arita, Tokyo (JP); and Shunsuke Kobayashi, Kanagawa (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Manabu Arita, Tokyo (JP); and Shunsuke Kobayashi, Kanagawa (JP)
Filed on Mar. 14, 2022, as Appl. No. 17/654,703.
Claims priority of application No. 2021-048453 (JP), filed on Mar. 23, 2021.
Prior Publication US 2022/0306885 A1, Sep. 29, 2022
Int. Cl. C09D 11/40 (2014.01); B41J 2/01 (2006.01); B41J 2/21 (2006.01); B41M 5/00 (2006.01); B41M 7/00 (2006.01); C09D 11/101 (2014.01); C09D 11/322 (2014.01)
CPC C09D 11/40 (2013.01) [B41J 2/01 (2013.01); B41J 2/2107 (2013.01); B41M 5/0023 (2013.01); B41M 7/009 (2013.01); C09D 11/101 (2013.01); C09D 11/322 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An ink set comprising:
a first ink; and
a second ink,
wherein the second ink contains a high-viscosity component having a viscosity of 500 mPa·s or higher at 25 degrees C., and a low-viscosity component having a viscosity of 30 mPa·s or lower at 25 degrees C.,
wherein a static surface tension γ1 (mN/m) of the first ink and a static surface tension γ2 (mN/m) of the second ink satisfy General formula (1) below,
−1 (mN/m)≤γ1−γ2≤5 (mN/m)  General formula (1),
and
a content A (% by mass) of each component contained in the first ink, a static surface tension B (mN/m) of each component contained in the first ink, a content C (% by mass) of each component contained in the second ink, and a static surface tension D (mN/m) of each component contained in the second ink satisfy General formula (2) below,
ΣA/Σ(A/B)−ΣC/Σ(C/D)≥0 (mN/m)   General formula (2);
wherein the first ink or the second ink, or both are active-energy-ray-curable inks; and
wherein the first ink and the second ink are free of water.