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US-12624235-B2 - Non-aqueous ink jet ink composition and recording method

US12624235B2US 12624235 B2US12624235 B2US 12624235B2US-12624235-B2

Abstract

A non-aqueous ink jet ink composition according to an embodiment of the present disclosure is an ink composition including a bright pigment, and glycol monoether A and glycol monoether B that are represented by Formula (1) and have flash points different from each other, in which the glycol ether A has a flash point of 85° C. or lower, the glycol monoether B has a flash point of 95° C. or higher, a total content of the glycol monoether A and the glycol monoether B is in a range of 20% to 60% by mass with respect to a total amount of the ink composition, and the content of the glycol monoether A is greater than the content of the glycol monoether B. R 1 —(O—R 2 ) n —OH  Formula (1) (In Formula (1), R 1 represents an alkyl group having 1 to 8 carbon atoms or a phenyl group, R 2 represents an alkylene group having 1 to 5 carbon atoms, and n represents an integer of 1 to 4.)

Inventors

  • Hiroshi Takiguchi
  • Kenichiro Kubota
  • Akira Matsumoto

Assignees

  • SEIKO EPSON CORPORATION

Dates

Publication Date
20260512
Application Date
20230330
Priority Date
20220331

Claims (9)

  1. 1 . A non-aqueous ink jet ink composition comprising: a bright pigment that is either a metal pigment or a pearl pigment; and glycol monoether A and glycol monoether B that are represented by Formula (1) and have flash points different from each other, wherein the bright pigment is subjected to a surface treatment with a phosphoric acid alkyl ester, the glycol monoether A has a flash point of 85° C. or lower, the glycol monoether B has a flash point of 95° C. or higher, a total content of the glycol monoether A and the glycol monoether B is in a range of 20% to 60% by mass with respect to a total amount of the ink composition, and the content of the glycol monoether A is greater than the content of the glycol monoether B, R 1 —(O—R 2 ) n —OH Formula (1) in Formula (1), R 1 represents an alkyl group having 1 to 8 carbon atoms or a phenyl group, R 2 represents an alkylene group having 1 to 5 carbon atoms, and n represents an integer of 1 to 4.
  2. 2 . The non-aqueous ink jet ink composition according to claim 1 , wherein R 2 in Formula (1) that represents the glycol monoether A represents an alkylene group having 3 carbon atoms.
  3. 3 . The non-aqueous ink jet ink composition according to claim 1 , wherein the glycol monoether B is tetraethylene glycol monobutyl ether.
  4. 4 . The non-aqueous ink jet ink composition according to claim 1 , further comprising: an acrylic resin.
  5. 5 . The non-aqueous ink jet ink composition according to claim 1 , further comprising: glycol diether represented by Formula (2), R 3 O—(R 4 O) m —R 5 Formula (2) in Formula (2), R 3 and R 5 each independently represent an alkyl group having 1 to 4 carbon atoms, R 4 represents an alkylene group having 2 or 3 carbon atoms, and m represents an integer of 1 to 4.
  6. 6 . The non-aqueous ink jet ink composition according to claim 1 , wherein the content of the glycol monoether A is in a range of 15% to 55% by mass with respect to the total amount of the ink composition.
  7. 7 . The non-aqueous ink jet ink composition according to claim 1 , wherein the content of the glycol monoether B is in a range of 5% to 15% by mass with respect to the total amount of the ink composition.
  8. 8 . The non-aqueous ink jet ink composition according to claim 1 , wherein a ratio (A/B) of the content of the glycol monoether A to the content of the glycol monoether B in terms of mass is 1.8 or greater.
  9. 9 . A recording method comprising: jetting the non-aqueous ink jet ink composition according to claim 1 using an ink jet method and making the non-aqueous ink jet ink composition adhere to a recording medium.

Description

The present application is based on, and claims priority from JP Application Serial Number 2022-058555, filed Mar. 31, 2022, the disclosure of which is hereby incorporated by reference herein in its entirety. BACKGROUND 1. Technical Field The present disclosure relates to a non-aqueous ink jet ink composition and a recording method. 2. Related Art An ink jet recording method enables recording of a high-definition image with a relatively simple device, and thus rapid development has been made in various fields. In recent years, it has been required to apply finer liquid droplets of an ink or the like at a high density to print a higher definition image at a high speed. Under such circumstances, attempts have been made to record an image having metallic gloss, and development of a metallic ink that enables printing of an image having higher gloss has been promoted. For example, JP2016-150984A discloses a non-aqueous ink jet ink composition that contains a bright pigment, specific glycol diether having a flash point of 70° C. or lower, and specific glycol monoether. However, in a case where printing is performed by overlapping a color ink on an upper layer of an image formed of a metallic ink, since the glossiness of a recorded material to be obtained is still insufficient, unevenness occurs when the printing speed is increased. That is, both satisfactory glossiness and a satisfactory property of reducing unevenness cannot be achieved at the same time. SUMMARY According to an aspect of the present disclosure, there is provided a non-aqueous ink jet ink composition including a bright pigment, and glycol monoether A and glycol monoether B that are represented by Formula (1) and have flash points different from each other, in which the glycol ether A has a flash point of 85° C. or lower, the glycol monoether B has a flash point of 95° C. or higher, a total content of the glycol monoether A and the glycol monoether B is in a range of 20% to 60% by mass with respect to a total amount of the ink composition, and the content of the glycol monoether A is greater than the content of the glycol monoether B. R1—(O—R2)n—OH  Formula (1) (In Formula (1), R1 represents an alkyl group having 1 to 8 carbon atoms or a phenyl group, R2 represents an alkylene group having 1 to 5 carbon atoms, and n represents an integer of 1 to 4.) According to another aspect of the present disclosure, there is provided a recording method including jetting the non-aqueous ink jet ink composition according to the above-described aspect using an ink jet method and making the non-aqueous ink jet ink composition adhere to a recording medium. BRIEF DESCRIPTION OF THE DRAWING FIGURE is a schematic view showing an example of a recording device that can be used for a recording method according to the present disclosure. DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the present disclosure will be described. The embodiments below will describe examples of the present disclosure. The present disclosure is not limited to the embodiments below and includes various modifications made in a range not departing from the scope of the present disclosure. Further, not all the configurations described below are necessarily essential configurations of the present disclosure. 1. Non-Aqueous Ink Jet Ink Composition A non-aqueous ink jet ink composition according to an embodiment of the present disclosure is a composition including a bright pigment, and glycol monoether A and glycol monoether B that are represented by Formula (1) and have flash points different from each other, in which the glycol ether A has a flash point of 85° C. or lower, the glycol monoether B has a flash point of 95° C. or higher, the total content of the glycol monoether A and the glycol monoether B is in a range of 20% to 60% by mass with respect to the total amount of the ink composition, and the content of the glycol monoether A is greater than the content of the glycol monoether B. R1—(O—R2)n—OH  Formula (1) (In Formula (1), R1 represents an alkyl group having 1 to 8 carbon atoms or a phenyl group, R2 represents an alkylene group having 1 to 5 carbon atoms, and n represents an integer of 1 to 4.) In the metallic printing of the related art, the pigment size of a metallic ink is increased within a range where the ink can be jetted, and drying of the ink is intended to take time at a relatively slow printing speed. That is, since a large-sized pigment is relatively large with respect to a nozzle hole of an ink jet head, the printing stability at a high frequency is degraded, and thus the printing speed is required to be decreased. One of the reasons for this is that a metal pigment is difficult to uniformly refine to have an extremely fine size and that the productivity of a crushing step is low and thus takes an extremely long time. Further, the reason why it takes a long time to dry the ink is that since a seamless and continuous reflection surface can be formed when the p