Ink set and recording method using ink set
View Patent ↗An ink set contains a white ink composition containing a white coloring material and a resin, and a non-white ink composition containing a non-white coloring material and a resin. The white ink composition and the non-white ink composition are used with a treatment liquid containing a coagulant for coagulating a component of the non-white ink composition. When a 5% by mass calcium acetate monohydrate aqueous solution and each of the ink compositions are mixed, a ratio of the viscosity increase after the mixing to the viscosity increase before the mixing is lower in the white ink composition than in the non-white ink composition.
1. An ink set comprising:
a white ink composition containing a white coloring material and a resin, the resin being dispersed in the form of an emulsion or as fine particles, and the resin having an acid value of 15 mgKOH/g or less;
a non-white ink composition containing a non-white coloring material, a dispersant having an acid value of 20 mgKOH/g or more, and a resin; and
a treatment liquid containing a coagulant for coagulating a component of the non-white ink composition,
wherein, when a 5% by mass calcium acetate monohydrate aqueous solution and each of the ink compositions are mixed, a ratio of a viscosity after the mixing to a viscosity before the mixing is lower in the white ink composition than in the non-white ink composition.
2. The ink set according to claim 1 , wherein
when 50% by mass of each of the ink compositions is evaporated, a ratio of a viscosity increase after the evaporation to a viscosity increase before the evaporation is higher in the white ink composition than in the non-white ink composition.
3. The ink set according to claim 1 , wherein
a content of a pigment of the white ink composition is larger than a content of a pigment of the non-white ink composition.
4. The ink set according to claim 1 , wherein
the coagulant is any one of:
a polyvalent metal salt;
an organic acid or a salt of the organic acid; or
a cationic compound.
5. The ink set according to claim 1 , wherein
the white coloring material is at least any one of a metal oxide or a hollow resin particle.
6. The ink set according to claim 1 , wherein
the ratio of the viscosity increase after the mixing to the viscosity increase before the mixing is 3.00 or less in the white ink composition.
7. The ink set according to claim 1 , wherein
when 50% by mass of each of the ink compositions is evaporated, a ratio of a viscosity increase after the evaporation to a viscosity increase before the evaporation is 20.00 or more in the white ink composition.
8. The ink set according to claim 1 , wherein the resin contained in the white ink composition is an acrylic resin.
9. The ink set according to claim 1 , wherein the dispersant contained in the non-white ink composition has an acid value of 50 mgKOH/g or more.