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US-20260125570-A1 - NONAQUEOUS INK COMPOSITION, RECORDING METHOD, METHOD FOR PRODUCING RECORDED MATERIAL, INK SET, RECORDED MATERIAL, AND INKJET RECORDING APPARATUS

US20260125570A1US 20260125570 A1US20260125570 A1US 20260125570A1US-20260125570-A1

Abstract

A nonaqueous ink composition is to be ejected by an inkjet method and contains a pigment, a pigment dispersant, an organic solvent, and a resin that is different from the pigment dispersant; the pigment contains a pigment having a specific structure; the content of the pigment dispersant is lower than the content of the pigment; and the content of the resin is higher than the content of the pigment.

Inventors

  • Fumie Yamazaki
  • Keishiro Yoshimori
  • Yuka ORIKASA
  • Mitsuyoshi Tamura

Assignees

  • DNP FINE CHEMICALS CO., LTD.

Dates

Publication Date
20260507
Application Date
20231027
Priority Date
20221111

Claims (20)

  1. 1 . A nonaqueous ink composition comprising a pigment, a pigment dispersant, an organic solvent, a resin different from the pigment dispersant, and being ejected by an inkjet method, the pigment comprising at least one or more pigments selected from the group consisting of a pigment A1 represented by the following formula (1), a pigment A2 represented by the following formula (2), and a pigment A3 represented by the following formula (3), a content of the pigment dispersant is smaller than a content of the pigment, and a content of the resin is greater than the content of the pigment: wherein in the formula (1), X 1 to X 16 each independently represent a halogen atom or a hydrogen atom; and M represents a metal atom optionally including two hydrogen atoms or a ligand.
  2. 2 . The nonaqueous ink composition according to claim 1 , wherein the content of the resin is greater than a total content of the pigment, the pigment dispersant, and a surfactant different from the resin.
  3. 3 . The nonaqueous ink composition according to claim 1 , wherein the content of the pigment is 1.0% by mass or more.
  4. 4 . The nonaqueous ink composition according to claim 1 , wherein the content of the resin is greater than the content of the pigment dispersant.
  5. 5 . The nonaqueous ink composition according to claim 1 , wherein (the content of the pigment dispersant)/(the content of the resin) is less than 0.8.
  6. 6 . The nonaqueous ink composition according to claim 1 , wherein (the content of the pigment dispersant)/(the content of the pigment) is less than 0.45.
  7. 7 . The nonaqueous ink composition according to claim 1 , wherein a content of water in the ink composition is 0.5% by mass or less.
  8. 8 . A recording method comprising ejecting the nonaqueous ink composition according to claim 1 to a surface of a base material by an inkjet method.
  9. 9 . A method for producing a recorded material, the method comprising ejecting the nonaqueous ink composition according to claim 1 to a surface of a base material by an inkjet method.
  10. 10 . An ink set comprising at least the nonaqueous ink composition according to claim 1 .
  11. 11 . A recorded material comprising a layer of the nonaqueous ink composition according to claim 1 , formed on a surface of a base material.
  12. 12 . An inkjet recording device comprising a storage container filled with the nonaqueous ink composition according to claim 1 .
  13. 13 . The nonaqueous ink composition according to claim 2 , wherein the content of the pigment is 1.0% by mass or more.
  14. 14 . The nonaqueous ink composition according to claim 2 , wherein the content of the resin is greater than the content of the pigment dispersant.
  15. 15 . The nonaqueous ink composition according to claim 2 , wherein (the content of the pigment dispersant)/(the content of the resin) is less than 0.8.
  16. 16 . The nonaqueous ink composition according to claim 2 , wherein (the content of the pigment dispersant)/(the content of the pigment) is less than 0.45.
  17. 17 . The nonaqueous ink composition according to claim 2 , wherein a content of water in the ink composition is 0.5% by mass or less.
  18. 18 . A recording method comprising ejecting the nonaqueous ink composition according to claim 2 to a surface of a base material by an inkjet method.
  19. 19 . A method for producing a recorded material, the method comprising ejecting the nonaqueous ink composition according to claim 2 to a surface of a base material by an inkjet method.
  20. 20 . An ink set comprising at least the nonaqueous ink composition according to claim 2 .

Description

TECHNICAL FIELD The present invention relates to a nonaqueous ink composition, a recording method, a method for producing a recorded material, an ink set, a recorded material, and an inkjet recording apparatus. BACKGROUND ART Ink compositions that are widely used include aqueous ink compositions obtained by dissolving or dispersing coloring materials in water or a mixture of water and an organic solvent, and nonaqueous ink compositions obtained by dissolving or dispersing coloring materials in an organic solvent that does not contain water. For example, Patent Document 1 discloses an ink composition for inkjet-recording including a copper complex dye (copper phthalocyanine), in which a free copper ion concentration is 10 ppm or less. Patent Document 1 mentions that this ink composition including no precipitates and having high levels of various properties required for inkjet recording ink compositions. Furthermore, Patent Document 2 also discloses technology relating to a nonaqueous inkjet ink set (ink set) that includes a blue ink (ink composition) including coloring materials such as C.I. Pigment Blue 60 and C.I. Pigment Violet 23. According to Patent Document 2, this non-aqueous inkjet ink set (ink set) has excellent ejection stability during continuous printing, and can produce printed materials with high resolution and wide color gamut. In this way, coloring materials having a phthalocyanine structure, C.I. Pigment Blue 60, and C.I. Pigment Violet 23 are used as coloring materials in ink compositions ejected by an inkjet method. CITATION LIST Patent Document Patent Document 1: Japanese Unexamined Patent Application, Publication No. 2000-355665Patent Document 2: Japanese Unexamined Patent Application, Publication No. 2022-140467 DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As mentioned above, phthalocyanine pigments having a phthalocyanine structure and pigments having a specific structure such as C.I. Pigment Blue 60 and C.I. Pigment Violet 23 are known. However, in nonaqueous ink compositions including these pigments having predetermined structures, study by the present inventors has revealed the problem that the pigments easily precipitate in the nonaqueous ink composition, which may lead to poor storage stability and inkjet ejection stability, or insufficient abrasion resistance of the printed material, and as a result, the properties required for the nonaqueous ink composition may not be satisfied. An object of the present invention is to provide a nonaqueous ink composition exhibiting high storage stability and high ejection stability even when nonaqueous ink composition includes a pigment having a predetermined structure is used, and being suitably used as a nonaqueous ink composition ejected by an inkjet method. Means for Solving the Problems The present inventors have intensively studied for solving the above-mentioned problems, and as a result, have found that the above-mentioned problems can be solved by setting the content ratio of a pigment and a pigment dispersant and the content ratio of the pigment and a resin in a predetermined range, and have completed the present invention. Specifically, the present invention provides the following. (1) A nonaqueous ink composition containing a pigment, a pigment dispersant, an organic solvent, a resin different from the pigment dispersant, and being ejected by an inkjet method, the pigment containing at least one or more pigments selected from the group consisting of a pigment A1 represented by the following formula (1), a pigment A2 represented by the following formula (2), and a pigment A3 represented by the following formula (3), a content of the pigment dispersant is smaller than a content of the pigment, and a content of the resin is greater than the content of the pigment. (In the formula (1), X1 to X16 each independently represent a halogen atom or a hydrogen atom; and M represents a metal atom optionally including two hydrogen atoms or a ligand.) (2) The nonaqueous ink composition described in (1), wherein the content of the resin is greater than a total content of the pigment, the pigment dispersant, and a surfactant different from the resin. (3) The nonaqueous ink composition described in (1) or (2), wherein the content of the pigment is 1.0% by mass or more. (4) The nonaqueous ink composition described in any one of (1) to (3), wherein the content of the resin is greater than the content of the pigment dispersant. (5) The nonaqueous ink composition described in any one of (1) to (4), wherein (the content of the pigment dispersant)/the content of the resin) is less than 0.8. (6) The nonaqueous ink composition described in any one of (1) to (5), wherein (the content of the pigment dispersant)/(the content of the pigment) is less than 0.45. (7) The nonaqueous ink composition described in any one of (1) to (6), wherein a content of water in the ink composition is 0.5% by mass or less. (8) A recording method including ejec