Ink set, and method for producing laminate
Provided is an ink set including a first ink and a second ink. 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. 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) 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. Σ A /Σ( A/B )−Σ C /Σ( C/D )≥0 (mN/m) General formula (2)
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,
Σ A /Σ( A/B )−Σ C /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.
2. The ink set according to claim 1 ,
wherein a viscosity of the first ink or the second ink, or both is 5 mPa·s or higher but 40 mPa·s or lower.
3. The ink set according to claim 1 ,
wherein the viscosity of the high-viscosity component at 25 degrees C. is 1,000 mPa·s or higher.
4. The ink set according to claim 1 ,
wherein the content A (% by mass) of each component contained in the first ink, the static surface tension B (mN/m) of each component contained in the first ink, the content C (% by mass) of each component contained in the second ink, and the static surface tension D (mN/m) of each component contained in the second ink satisfy General formula (3) below,
Σ A /Σ( A/B )−Σ C /Σ( C/D )≥3 (mN/m) General formula (3).
5. The ink set according to claim 1 ,
wherein the content A (% by mass) of each component contained in the first ink, the static surface tension B (mN/m) of each component contained in the first ink, the content C (% by mass) of each component contained in the second ink, and the static surface tension D (mN/m) of each component contained in the second ink satisfy General formula (4) below,
Σ A /Σ( A/B )−Σ C /Σ( C/D )≥5 (N/m) General formula (4).
6. The ink set according to claim 1 ,
wherein each component is a liquid component.
7. A method for producing a laminate using the ink set according to claim 1 , the method comprising:
applying the first ink on a base material to form a first layer;
applying the second ink on the first layer to form a second layer; and
solidifying the first layer and the second layer by curing or drying, or both, to form a laminate.
8. The method for producing a laminate according to claim 7 ,
wherein the first layer in the applying the second ink is a liquid, and has a viscosity of 5 mPa·s or higher but 40 mPa·s or lower at 25 degrees C.
9. The ink set according to claim 1 , wherein the static surface tension γ1 (mN/m) of the first ink and the static surface tension γ2 (mN/m) of the second ink satisfies the formula: 2.5 (mN/m)≤γ1−γ2≤4.1 (mN/m).
10. The ink set according to claim 2 , wherein the viscosity of the second ink is: 27 mPa·s or more and 40 mPa·s or lower.