JP2018053159A - Nonaqueous inkjet ink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonaqueous inkjet ink that can suppress deformation of a clear file and deformation of paper and has suppressed odor.SOLUTION: The nonaqueous inkjet ink includes a coloring agent, a fatty acid ester which is an ester of a fatty acid and a 10C or more alcohol with a total carbon number of 24 or more and an organic solvent including a triethylene glycol monoalkyl ether represented by formula (1) as give below. In formula (1), R represents a 2-5C alkyl group.SELECTED DRAWING: None

Description

  Embodiments described herein relate generally to a non-aqueous inkjet ink.

The ink jet recording method is a method in which ink jet ink having high fluidity is ejected as droplets from fine nozzles, and an image is recorded on a recording medium placed facing the nozzles, and high speed printing can be performed with low noise. Therefore, it has been spreading rapidly in recent years.
As an ink used in such an ink jet recording method, an aqueous ink containing water as a main solvent, an ultraviolet curable ink (UV ink) containing a polymerizable monomer as a main component and a high content, and a wax as a main component are high. A so-called non-aqueous ink containing a non-aqueous solvent as a main solvent together with hot-melt ink (solid ink) contained in a content is known. Non-aqueous inks can be classified into solvent ink (solvent ink) whose main solvent is a volatile organic solvent, and oil ink (oil ink) whose main solvent is a low-volatile or nonvolatile organic solvent. The solvent ink is dried on the recording medium mainly by evaporation of the organic solvent, whereas the oil-based ink is dried mainly by penetrating into the recording medium.

  Document storage has a structure in which two plastic sheets are bound together, and a clear file that is used by sandwiching a document between the two sheets is widely used in offices and homes. . When a printed matter printed using non-aqueous ink is sandwiched between clear files using polypropylene (PP) as a main component, the clear file may be deformed so as to wave as time passes.

Patent Document 1 discloses that a pivalate ester having 25 or more carbon atoms and a formula HO— (CH ₂ CH ₂ O) _n —R (wherein R is carbon) with the object of suppressing deformation of the clear file and reducing the solubility of the toner. A non-aqueous inkjet ink containing an organic solvent containing ethylene glycol monoalkyl ether or diethylene glycol monoalkyl ether represented by an alkyl group of several 4 to 6 and n is an integer of 1 or 2 is disclosed.

Japanese Unexamined Patent Publication No. 2013-166813

Patent Document 1 discloses using a pivalic acid ester having 25 or more carbon atoms and a specific ethylene glycol ether. However, even with this method, there is room for improvement in suppressing the deformation of the clear file.
Further, it has been found that when a fatty acid ester and ethylene glycol ether are combined, deformation (paper deformation) may occur in the printed paper.
Moreover, when alcohol with a small carbon number is generated by hydrolysis of a fatty acid ester, an odor resulting from the generated alcohol may be generated.

  Accordingly, an object of the present invention is to provide a non-aqueous ink-jet ink that can suppress clear file deformation and paper deformation and that has reduced odor.

  One aspect of the present invention relates to the following non-aqueous inkjet ink.

式（１）中、Ｒは炭素数２〜５のアルキル基を表す。 <1> a colorant;
An organic solvent containing an ester of a fatty acid and an alcohol having 10 or more carbon atoms and a total number of carbon atoms of 24 or more, and a triethylene glycol monoalkyl ether represented by the following formula (1):
A non-aqueous ink jet ink.

In formula (1), R represents an alkyl group having 2 to 5 carbon atoms.

<2> The non-aqueous inkjet ink according to <1>, wherein the triethylene glycol monoalkyl ether includes triethylene glycol monobutyl ether.

<3> The non-aqueous inkjet ink according to <1> or <2>, wherein the content of the triethylene glycol monoalkyl ether is 5 to 20% by mass with respect to the total amount of the non-aqueous inkjet ink.

  ADVANTAGE OF THE INVENTION According to this invention, the clear file deformation | transformation and paper deformation | transformation can be suppressed, and the non-aqueous inkjet ink by which the odor was suppressed can be provided.

  Although one embodiment of the present invention is described below, the present invention is not limited to the following embodiment.

式（１）中、Ｒは炭素数２〜５のアルキル基を表す。 The non-aqueous inkjet ink of the embodiment (hereinafter, also referred to as “ink” or “non-aqueous ink”) is an ester of a colorant, a fatty acid, and an alcohol having 10 or more carbon atoms, and has a total carbon number of 24. A non-aqueous inkjet ink comprising the fatty acid ester as described above and an organic solvent containing a triethylene glycol monoalkyl ether represented by the following formula (1).

In formula (1), R represents an alkyl group having 2 to 5 carbon atoms.

  Hereinafter, components contained in the ink according to the embodiment, a method for preparing the ink, and physical properties of the ink will be described.

  In the embodiment, the non-aqueous ink-jet ink includes a fatty acid ester having a fatty acid and an alcohol having 10 or more carbon atoms and an overall carbon number of 24 or more, and a triethylene glycol monoalkyl ether represented by the formula (1). And an organic solvent containing. In an embodiment, the organic solvent is an ester of a fatty acid and an alcohol having 10 or more carbon atoms, the fatty acid ester having a total carbon number of 24 or more, a triethylene glycol monoalkyl ether represented by the formula (1), Can be provided, a non-aqueous ink-jet ink in which clear file deformation and paper deformation can be suppressed and odor is suppressed can be provided.

A fatty acid ester (hereinafter, also referred to as “fatty acid ester A”) that is an ester of a fatty acid and an alcohol having 10 or more carbon atoms and having an overall carbon number of 24 or more will be described.
In the embodiment, the total number of carbon atoms of the fatty acid ester A is preferably 24 or more, and more preferably 25 or more, from the viewpoint of suppression of clear file deformation.
Moreover, since the viscosity of the ink using the fatty acid ester tends to increase as the number of carbon atoms of the fatty acid ester increases, the total number of carbon atoms of the fatty acid ester A is preferably 40 or less from the viewpoint of the viscosity of the ink-jet ink and ejection properties. 30 or less is more preferable.
The total number of carbon atoms of the fatty acid ester A may be, for example, 24 to 40, 24 to 35, 25 to 30, or 25 to 28, but is not limited thereto.

In the embodiment, the fatty acid ester A is an ester of a fatty acid and an alcohol having 10 or more carbon atoms. Alcohol is generated when the fatty acid ester is hydrolyzed, but alcohol with a small number of carbon atoms generates odor. In the fatty acid ester A, the number of carbon atoms of the alcohol is preferably 10 or more, more preferably 12 or more, more preferably 13 or more, and still more preferably 14 or more, from the viewpoint of suppressing the odor of the ink. Further, the carbon number of the alcohol is preferably 20 or less, more preferably 18 or less, and still more preferably 16 or less, from the viewpoint of dischargeability. The alcohol may be saturated or unsaturated. Moreover, it may be linear or branched.
In the fatty acid ester A, the fatty acid is not particularly limited, and may be either a saturated fatty acid or an unsaturated fatty acid. Further, it may be linear or branched. Although carbon number of a fatty acid is not specifically limited, From a viewpoint of odor suppression, 5 or more are preferable, 8 or more are more preferable, and 10 or more are further more preferable. Further, the number of carbon atoms of the fatty acid is preferably 20 or less, more preferably 18 or less, and still more preferably 16 or less, from the viewpoint of dischargeability.

式（２）において、Ｒ^１は、アルキル基であり、Ｒ^２は、炭素数１０以上のアルキル基である。
Ｒ^１及びＲ^２は、それぞれ、独立に、直鎖状であっても分岐状であってもよい。Ｒ^１の炭素数は、脂肪酸エステルＡの脂肪酸の炭素数から１を除いたものであり、具体的には、Ｒ^１の炭素数は、４以上が好ましく、７以上がより好ましく、９以上がさらに好ましい。また、Ｒ^１の炭素数は、１９以下が好ましく、１７以下がより好ましく、１５以下がさらに好ましい。
Ｒ²の炭素数は、脂肪酸エステルＡのアルコールの炭素数と同義であり、好ましい範囲も同様である。具体的には、Ｒ^２の炭素数は、１２以上がより好ましく、１４以上がさらに好ましい。また、Ｒ²の炭素数は、２０以下が好ましく、１８以下がより好ましく、１６以下がさらに好ましい。 The fatty acid ester A is preferably a fatty acid ester represented by the following formula (2).

In the formula (2), R ¹ is an alkyl group, and R ² is an alkyl group having 10 or more carbon atoms.
R ¹ and R ² may each independently be linear or branched. The carbon number of R ¹ is one obtained by subtracting 1 from the carbon number of the fatty acid of fatty acid ester A. Specifically, the carbon number of R ¹ is preferably 4 or more, more preferably 7 or more, and 9 or more. Further preferred. The number of carbon atoms of ^{R 1} is preferably 19 or less, more preferably 17 or less, more preferably 15 or less.
The carbon number of R ² is synonymous with the carbon number of the alcohol of fatty acid ester A, and the preferred range is also the same. Specifically, the carbon number of R ² is more preferably 12 or more, and further preferably 14 or more. The carbon number of R ² is preferably 20 or less, more preferably 18 or less, and still more preferably 16 or less.

  Specific examples of the fatty acid ester A include the following compounds, but the fatty acid ester A is not limited to these compounds. In the following list of compounds, CFA represents the carbon number of the fatty acid, CA represents the carbon number of the alcohol, and CT represents the total carbon number of the fatty acid ester.

Isoeicosyl pivalate (CFA = 5, CA = 20, CT = 25)
Isostearyl palmitate (CFA = 16, CA = 18, CT34)
Decyl oleate (CFA = 18, CA = 10, CT28)
Oleyl oleate (CFA = 18, CA = 18, CT36)

  Among the specific examples of the fatty acid ester A, isoeicosyl pivalate and decyl oleate are preferable.

Fatty acid ester A may use only 1 type and may use it in combination of 2 or more type.
From the viewpoint of storage stability, the content of the fatty acid ester A is preferably 30% by mass or more, more preferably 40% by mass or more, and further preferably 50% by mass or more based on the total amount of the ink. Further, the content of the fatty acid ester A is preferably 90% by mass or less, more preferably 80% by mass or less, and further preferably 70% by mass or less based on the total amount of ink from the viewpoint of ejection stability.

式（１）中、Ｒは炭素数２〜５のアルキル基を表す。 The triethylene glycol monoalkyl ether represented by the formula (1) will be described.

In formula (1), R represents an alkyl group having 2 to 5 carbon atoms.

  In the embodiment, when the ink contains the triethylene glycol monoalkyl ether represented by the formula (1) together with the fatty acid ester A, it is possible to suppress clear file deformation and paper deformation.

Formula (1) is a triethylene glycol monoalkyl ether in which one hydroxy group of triethylene glycol is alkylated, but having a structure in which one hydroxy group is alkylated contributes to the suppression of clear file deformation. sell.
In Formula (1), the polymerization degree of ethylene glycol (CH ₂ CH ₂ O) is 3, and R represents an alkyl group having 2 to 5 carbon atoms.
In ethylene glycol monoalkyl ether represented by HO— (CH ₂ CH ₂ O) _n —R (R is an alkyl group), when the polymerization degree n of ethylene glycol increases, the polarity of ethylene glycol monoalkyl ether increases, It is considered that paper deformation tends to occur because it affects the hydrogen bonding of paper. On the other hand, when the carbon number of R is increased, the polarity of ethylene glycol monoalkyl ether is lowered, and it is likely to penetrate into the clear file. Therefore, it is considered that the deformation of the clear file tends to occur.
In Formula (1), the polymerization degree of ethylene glycol is 3, and R is an alkyl group having 2 to 5 carbon atoms. In this case, the balance between the two suppresses clear file deformation and paper deformation. I think it can be done.

  In the formula (1), R is an alkyl group having 2 to 5 carbon atoms. R may be linear or branched. R is more preferably an alkyl group having 2 to 4 carbon atoms, and further preferably an alkyl group having 4 carbon atoms.

  Preferred examples of the triethylene glycol monoalkyl ether represented by the formula (1) include triethylene glycol monoethyl ether (R = alkyl group having 2 carbon atoms), triethylene glycol monopropyl ether (R = alkyl having 3 carbon atoms). Group) triethylene glycol monobutyl ether (R = alkyl group having 4 carbon atoms) and triethylene glycol monopentyl ether (R = alkyl group having 5 carbon atoms). Of these, triethylene glycol monoethyl ether (R = alkyl group having 2 carbon atoms), triethylene glycol monobutyl ether (R = alkyl group having 4 carbon atoms), and triethylene glycol monopentyl ether are preferable. Butyl ether (R = C4 alkyl group) is more preferred.

  The triethylene glycol monoalkyl ether represented by the formula (1) may be used alone or in combination of two or more.

The triethylene glycol monoalkyl ether represented by the formula (1) is a polar solvent that can be easily mixed with a fatty acid ester, and is good when the triethylene glycol monoalkyl ether represented by the formula (1) is used. It tends to be easy to obtain good ink repellency.
The content of the triethylene glycol monoalkyl ether represented by the formula (1) is preferably 3% by mass or more, more preferably 5% by mass or more with respect to the total amount of ink from the viewpoint of improving ink repellency. The mass% or more is more preferable.
Further, the content of the triethylene glycol monoalkyl ether represented by the formula (1) is 25% by mass with respect to the total amount of the ink from the viewpoint of maintaining the affinity of the components and improving the storage stability of the ink. The following is preferable, 20% by mass or less is more preferable, and 15% by mass or less is more preferable.

  The ratio of the content of the fatty acid ester A and the triethylene glycol monoalkyl ether represented by the formula (1) is not particularly limited, but the mass of the fatty acid ester A: the triethylene glycol monoalkyl ether represented by the formula (1) The ratio is preferably 99: 1 to 75:25, more preferably 99: 1 to 80:20, and still more preferably 90: 5 to 85:15.

  The total content of the fatty acid ester A and the triethylene glycol monoalkyl ether represented by the formula (1) is 50% by mass or more based on the total solvent of the ink, although it depends on the type of other organic solvent contained. Is preferable, 70 mass% or more is more preferable, 90 mass% or more is further preferable, and 100 mass% may be sufficient.

  In the embodiment, in addition to the fatty acid ester A and the triethylene glycol monoalkyl ether represented by the formula (1), the organic solvent can form a single phase with these organic solvents as necessary. Other organic solvents may be included. Other organic solvents include non-aqueous solvents.

  As the non-aqueous solvent, any of a non-polar organic solvent and a polar organic solvent can be used. These may be used alone or in combination. In the present invention, as the non-aqueous solvent, it is preferable to use a water-insoluble organic solvent that is not uniformly mixed with the same volume of water at 1 atm.

  Preferable examples of the nonpolar organic solvent include petroleum hydrocarbon solvents such as aliphatic hydrocarbon solvents, alicyclic hydrocarbon solvents, and aromatic hydrocarbon solvents. Examples of the aliphatic hydrocarbon solvent and the alicyclic hydrocarbon solvent include non-aqueous solvents such as paraffinic, isoparaffinic, and naphthenic solvents, and commercially available products include 0 Solvent L, 0 Solvent M, 0 Solvent H, Cactus normal paraffin N-10, Cactus normal paraffin N-11, Cactus normal paraffin N-12, Cactus normal paraffin N-13, Cactus normal paraffin N-14, Cactus normal paraffin N-15H, Cactus normal paraffin YHNP Cactus normal paraffin SHNP, Isosol 300, Isosol 400, Teclean N-16, Teclean N-20, Teclean N-22, AF Solvent No. 4, AF Solvent No. 5, AF Solvent No. 6, AF Solvent No. 7, Futezol 160, Naphthezol 200, Naphthezol 220 (all trade names made by JX Nippon Oil & Energy Corporation); Isopar G, Isopar H, Isopar L, Isopar M, Exol D40, Exol D60, Exol D80, Exol D95, Exol D110 And Exol D130 (both are trade names manufactured by TonenGeneral Sekiyu KK) and the like. As the aromatic hydrocarbon solvent, grade alkene L, grade alkene 200P (all are trade names manufactured by JX Nippon Oil & Energy Corporation), Solvesso 100, Solvesso 150, Solvesso 200, Solvesso 200ND (all are TonenGeneral Sekiyu KK) The product name of the product and the like can be preferably mentioned. The distillation initial boiling point of the petroleum hydrocarbon solvent is preferably 100 ° C. or higher, more preferably 150 ° C. or higher, and even more preferably 200 ° C. or higher. The distillation initial boiling point can be measured in accordance with JIS K0066 “Method for Distillation Test of Chemical Products”.

  Preferable examples of the polar organic solvent include higher alcohol solvents and higher fatty acid solvents. For example, a higher alcohol solvent having 6 or more, preferably 12 to 20 carbon atoms in one molecule, such as isomyristyl alcohol, isopalmityl alcohol, isostearyl alcohol, oleyl alcohol, isoeicosyl alcohol, decyltetradecanol; Higher fatty acid solvents such as lauric acid, isomyristic acid, palmitic acid, isopalmitic acid, α-linolenic acid, linoleic acid, oleic acid, isostearic acid and the like having 12 or more, preferably 14 to 20 carbon atoms in one molecule Is mentioned. The boiling point of polar organic solvents such as higher alcohol solvents and higher fatty acid solvents is preferably 150 ° C. or higher, more preferably 200 ° C. or higher, and even more preferably 250 ° C. or higher. The non-aqueous solvent having a boiling point of 250 ° C. or higher includes non-aqueous solvents that do not exhibit a boiling point.

  In embodiments, the colorant may be a pigment or a dye.

  As the pigment, organic pigments such as azo pigments, phthalocyanine pigments, polycyclic pigments, dyed lake pigments, and inorganic pigments can be used. Examples of the azo pigment include a soluble azo lake pigment, an insoluble azo pigment, and a condensed azo pigment. Examples of phthalocyanine pigments include metal phthalocyanine pigments and metal-free phthalocyanine pigments. Polycyclic pigments include quinacridone pigments, perylene pigments, perinone pigments, isoindoline pigments, isoindolinone pigments, dioxazine pigments, thioindigo pigments, anthraquinone pigments, quinophthalone pigments, metal complex pigments. And diketopyrrolopyrrole (DPP). Representative examples of inorganic pigments include carbon black and titanium oxide. These pigments may be used alone or in combination of two or more.

The average particle diameter of the pigment is preferably 300 nm or less, more preferably 150 nm or less, and further preferably 100 nm or less from the viewpoints of dispersibility and storage stability. Here, the average particle diameter of the pigment is a value measured by a dynamic light scattering particle size distribution analyzer LB-500 manufactured by Horiba, Ltd.
The content of the pigment in the ink is preferably 0.01 to 20% by mass with respect to the total amount of the ink, more preferably 1 to 15% by mass from the viewpoint of printing density and ink viscosity. More preferably, it is mass%.

When a pigment is included as a colorant, it is preferable to contain a pigment dispersant in order to improve the dispersion of the pigment in the ink.
The pigment dispersant is not particularly limited as long as it can stably disperse the pigment in a non-aqueous solvent. Examples thereof include a hydroxyl group-containing carboxylic acid ester, a salt of a long-chain polyaminoamide and a high molecular weight acid ester, and a high molecular weight polycarboxylic acid. Salt of acid, salt of long chain polyaminoamide and polar acid ester, high molecular weight unsaturated acid ester, copolymer of vinyl pyrrolidone and long chain alkene, modified polyurethane, modified polyacrylate, polyether ester type anionic activator, Polyoxyethylene alkyl phosphate ester, polyester polyamine and the like are preferably used.

  Commercially available pigment dispersants include “Antalon V216 (vinyl pyrrolidone / hexadecene copolymer)” (trade name) manufactured by ISP Japan, “Solsperse 13940 (polyesteramine type) manufactured by Nippon Lubrizol Co., Ltd. ), 17000, 18000 (fatty acid amine series), 11200, 21000, 24000, 28000 (all trade names), “Fuka 400, 401, 402, 403, 450, 451, 453 (modified polyacrylate) manufactured by BASF Japan Ltd. ), 46, 47, 48, 49, 4010, 4055 (modified polyurethane) "(all trade names)," Disparon KS-860, KS-873N4 (polyester amine salt) "manufactured by Enomoto Kasei Co., Ltd. (all products) Name), "Daiichi Kogyo Seiyaku Co., Ltd." Lumpur 202,206, OA-202, OA-600 (multi-chain polymeric nonionic) "(all trade names).

  The pigment dispersant is preferably contained in a mass ratio of 0.2 to 1.0 with respect to the pigment 1. The content of the pigment dispersant in the total amount of ink is preferably 0.5 to 15% by mass, and more preferably 1 to 5% by mass.

  Further, a pigment derivative may be contained in order to improve the dispersion of the pigment in the ink. Any pigment derivative may be used as long as a polar functional group is introduced into the pigment skeleton. Examples of the pigment derivative include a skeleton of a pigment such as phthalocyanine, azo, anthraquinone, quinacridone, carboxyl group, sulfonic acid group, amino group, nitro group, acid amide group, carbonyl group, carbamoyl group, phthalimide group. , A group to which a functional group such as a sulfonyl group is added, and a salt thereof can be preferably used.

  As dyes, azo dyes, metal complex dyes, naphthol dyes, anthraquinone dyes, indigo dyes, carbonium dyes, quinoneimine dyes, xanthene dyes, cyanine dyes, quinoline dyes, nitro dyes, nitroso dyes, benzoquinone dyes, naphthoquinone dyes, phthalocyanine dyes, Mention may be made of oil-soluble dyes such as metal phthalocyanine dyes. These dyes may be used alone or in combination of two or more.

  The content of the dye in the ink is preferably 1 to 10% by mass, more preferably 2 to 8% by mass, and even more preferably 3 to 5% by mass with respect to the total amount of the ink.

In the embodiment, the ink may contain various additives that are usually used in the art as long as they do not impair the object of the present invention.
Specifically, as an antifoaming agent, a surface tension reducing agent, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, a nonionic surfactant, or a polymer-based, silicone-based, or fluorine-based surfactant. An agent or the like may be added to the ink.
Further, dibutylhydroxytoluene, propyl gallate, tocopherol, butylhydroxyanisole, nordihydroguaiaretic acid, etc., may be added to the ink as an antioxidant.

The method for preparing the ink of the embodiment is not particularly limited.
When the colorant is a pigment, the ink can be produced, for example, by mixing and dispersing all components in a lump or divided. For example, a pigment dispersion containing a pigment, a pigment dispersant, and an organic solvent can be prepared first, and further added with an organic solvent and other optional components. Or you may mix all the compounding components at once. As the dispersing means, for example, a ball mill, a bead mill, or the like can be used. After dispersion, if desired, it may be passed through a filter such as a membrane filter.
When the colorant is a dye, the ink can be produced, for example, by mixing all components.

  In the embodiment, the viscosity of the ink when used in the ink jet recording apparatus has a suitable range depending on the nozzle diameter of the ejection head, the ejection environment, and the like, but in general, it is preferably 1 to 30 mPa · s at 23 ° C. More preferably, it is ˜15 mPa · s. Here, the viscosity represents a value at 23 ° C.

  The manufacturing method of the printed matter using the ink of embodiment is not specifically limited. The method for producing a printed material according to the embodiment is preferably, for example, a method including applying the ink according to the embodiment to a recording medium by an inkjet recording method. The ink jet recording apparatus to be used may be of any system such as a piezo system, an electrostatic system, or a thermal system. In the case of using an ink jet recording apparatus, for example, the ink of the embodiment may be ejected from an ink jet head based on a digital signal, and the ejected ink droplets may be attached to a recording medium.

  In the embodiment, the recording medium is not particularly limited, and printing paper such as plain paper, coated paper, and special paper, cloth, inorganic sheet, film, OHP sheet, and the like, and an adhesive layer on the back surface using these as a base material. The provided adhesive sheet etc. can be used. Among these, printing paper such as plain paper and coated paper can be preferably used from the viewpoint of ink permeability.

  Here, the plain paper is paper in which an ink receiving layer, a film layer, and the like are not formed on normal paper. Examples of plain paper include high quality paper, medium quality paper, PPC paper, reprinted paper, recycled paper, and the like. Plain paper is a paper in which ink easily penetrates because paper fibers having a thickness of several μm to several tens of μm form voids of several tens to several hundreds of μm.

  As the coated paper, matte paper, glossy paper, semi-glossy paper or other inkjet coated paper, or so-called coated printing paper can be preferably used. Here, the coated printing paper is a printing paper conventionally used in letterpress printing, offset printing, gravure printing, etc., and has an inorganic pigment such as clay or calcium carbonate on the surface of high-quality paper or medium-quality paper. A printing paper provided with a coating layer by a paint containing a binder such as starch. Coated printing paper can be applied to fine coated paper, high-quality lightweight coated paper, medium-weight lightweight coated paper, high-quality coated paper, medium-quality coated paper, art paper, cast coated paper, etc., depending on the coating amount and coating method. being classified.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples.

[Preparation of ink]
In the formulations shown in Tables 1 to 4, the components shown in Tables 1 to 4 were mixed and dispersed under the following dispersion conditions to obtain inks of Examples and Comparative Examples. In Tables 1 to 4, the numbers shown for each component indicate “mass%”.
(Distribution condition)
Disperser: Bead mill “MiniCer” (manufactured by Ashizawa Finetech Co., Ltd.)
Dispersion residence time: about 10 minutes

  The components shown in Tables 1 to 4 are as follows. In the following, for the fatty acid ester solvent, CFA represents the carbon number of the fatty acid, CA represents the carbon number of the alcohol, and CT represents the carbon number of the entire fatty acid ester.

<Pigment>
Carbon black (MA8 manufactured by Mitsubishi Chemical Corporation)
Copper phthalocyanine blue (FASTOGEN Blue LA5380 manufactured by DIC Corporation)

<Pigment dispersant>
Pigment dispersant 1 (Solsperse 13940, manufactured by Nippon Lubrizol Corporation)
Pigment dispersant 2 (Solsperse 21000 manufactured by Nippon Lubrizol Corporation)

<Fatty acid ester solvent>
Isotridecyl isononanoate (CFA = 9, CA = 13, CT = 22)
Isooctyl palmitate (CFA = 16, CA = 8, CT = 24)
Decyl oleate (CFA = 18, CA = 10, CT = 28)
Isoeicosyl pivalate (CFA = 5, CA = 20, CT = 25)

<Ethylene glycol ether solvent>
Triethylene glycol monoethyl ether (ethylene glycol polymerization degree 3, R = C2 alkyl group)
Triethylene glycol monobutyl ether (ethylene glycol polymerization degree 3, R = C4 alkyl group)
Triethylene glycol monopentyl ether (ethylene glycol polymerization degree 3, R = alkyl group having 5 carbon atoms)
Triethylene glycol monohexyl ether (ethylene glycol polymerization degree 3, R = alkyl group having 6 carbon atoms)
Triethylene glycol monomethyl ether (ethylene glycol polymerization degree 3, R = alkyl group having 1 carbon atom)
Diethylene glycol monobutyl ether (ethylene glycol polymerization degree 2, R = C4 alkyl group)
Diethylene glycol monomethyl ether (ethylene glycol polymerization degree 2, R = C1 alkyl group)
Diethylene glycol monoethyl ether (ethylene glycol polymerization degree 2, R = C2 alkyl group)
Tetraethylene glycol monobutyl ether (ethylene glycol polymerization degree 4, R = C4 alkyl group)
Triethylene glycol methyl butyl ether (ethylene glycol polymerization degree 3, having a structure in which two hydroxy groups of triethylene glycol are alkylated)

[Evaluation]
<Clear file deformation and paper deformation>
Each of the inks described above is loaded into a line-type ink jet printer “Orifice EX9050” (manufactured by Riso Kagaku Kogyo Co., Ltd.). A printed material was obtained by printing a solid image of 600 nozzles × 260 mm in the sub-scanning direction.
The obtained printed matter is sandwiched between clear files made of polypropylene (PP), left at room temperature for one week, and the clear file and printed matter (paper) after standing for one week are visually observed. Paper deformation was evaluated.
Note that the “Orifice EX 9050” is a system that uses a line-type inkjet head and conveys paper in the sub-scanning direction orthogonal to the main scanning direction (the direction in which the nozzles are arranged) to perform printing.

(Clear file transformation)
A: No clear file warp or clear lily warp within 1 cm from the bottom.
B: Warping of the clear file within 1 cm to 5 cm from the bottom is observed.
C: Warping of clear file exceeding 5 cm from the bottom is seen. Deformation that would hinder use.
(Paper deformation)
A: Waves are not seen or waves within 1 mm from the bottom are seen.
B: Waves greater than 1 mm and within 5 mm are seen from the bottom.
C: Waves exceeding 5 mm are seen from the bottom.

<Odor>
The printed material prepared for evaluation of clear file deformation and paper deformation was left at room temperature for 1 week in a state of being sandwiched between clear files. The odor of the printed matter after being left was evaluated according to the following criteria by sensory evaluation. The sensory evaluation was performed by five panelists, and the result of exceeding the majority of the five panel evaluations was regarded as the odor evaluation result. That is, when the majority panel is C (has an odor), the majority of the panels are C or less and no odor is present.
A: No odor
C: Odor

<Ink repellency>
Each ink was put in a 30 ml container, one end of a nozzle plate (5 cm long, 5 mm wide) was picked with tweezers, and the other end 2 cm was immersed in the ink. Thereafter, the nozzle plate is quickly lifted from the ink, the time until the ink film remaining on the nozzle plate becomes ink droplets is measured, this is repeated 10 times, and the average value of the 10 measured values is calculated, The ink repellency time was evaluated, and the ink repellency was evaluated according to the following criteria.
A: Ink repellent time less than 3 seconds
B: Ink repellent time 3 seconds or more and less than 6 seconds C: Ink repellent time 6 seconds or more

<Storage stability>
Put each ink in an airtight container and leave it in an environment of 70 ° C. for one week, measure the viscosity of the ink before leaving (initial value of viscosity) and the viscosity of the ink after leaving, and use the following formula to determine the viscosity of the ink. The rate of change was calculated.
Viscosity change rate = [(viscosity value after one week × 100) / (initial value of viscosity)] − 100 (%)
The storage stability was evaluated according to the following criteria using the calculated viscosity change rate.
A: Viscosity change rate less than 5%
B: Viscosity change rate 5% or more and less than 10%
C: Viscosity change rate of 10% or more

In the inks of Examples 1 to 10, clear file deformation and paper file deformation were suppressed, and odor was also suppressed.
In addition, the inks of Examples 1 to 8, in which the content of triethylene glycol monoalkyl ether is 5 to 20% by mass with respect to the total amount of ink, are further excellent in ink repellency and storage stability. Indicated.

  On the other hand, in Comparative Examples 1 to 9, none of the clear file deformation and the paper file deformation was suppressed, and the odor was not suppressed.

In Comparative Example 6 using isotridecyl isononanoate having a fatty acid ester having a carbon number of less than 24, clear file deformation that hinders use was observed.
Moreover, in Comparative Example 7 using isooctyl palmitate in which the fatty acid ester alcohol had less than 10 carbon atoms, there was an odor.

In Comparative Example 2 using diethylene glycol monobutyl ether (degree of polymerization of ethylene glycol, R is an alkyl group having 4 carbon atoms), clear file deformation that hinders use was observed. In Comparative Examples 3 and 4 using diethylene glycol monomethyl ether or diethylene glycol monoethyl ether (ethylene glycol polymerization degree 2, R is an alkyl group having 1 or 2 carbon atoms), deformation of paper was observed, respectively. Comparative Example 1 using triethylene glycol monomethyl ether (ethylene glycol polymerization degree 3, R is an alkyl group having 1 carbon atom) and tetraethylene glycol monobutyl ether (ethylene glycol polymerization degree 4, R is carbon A clear paper deformation was also observed in Comparative Example 5 using an alkyl group of formula (4). In Comparative Example 8 using triethylene glycol monohexyl ether (ethylene glycol has a degree of polymerization of 3 and R is an alkyl group having 6 carbon atoms), the clear file was deformed so as to hinder use. .
Thus, in ethylene glycol ether solvents, it was shown that paper deformation tends to occur when the degree of polymerization of ethylene glycol is large, and clear file deformation tends to occur when the number of carbon atoms in R increases. . In contrast, in Examples 1 to 10, in which the polymerization degree of ethylene glycol was 3 and the carbon number of R was 2 to 5, clear file deformation and paper deformation were suppressed as described above.

  Further, in Comparative Example 9 using triethylene glycol methyl butyl ether having a structure in which two hydroxy groups of triethylene glycol were both alkylated, the clear file was deformed so as to hinder use.

Claims (3)

A colorant;
An organic solvent containing an ester of a fatty acid and an alcohol having 10 or more carbon atoms and a total number of carbon atoms of 24 or more, and a triethylene glycol monoalkyl ether represented by the following formula (1):
A non-aqueous ink jet ink.

(In formula (1), R represents an alkyl group having 2 to 5 carbon atoms.)   The non-aqueous inkjet ink according to claim 1, wherein the triethylene glycol monoalkyl ether includes triethylene glycol monobutyl ether. The non-aqueous inkjet ink according to claim 1 or 2, wherein a content of the triethylene glycol monoalkyl ether is 5 to 20% by mass with respect to the total amount of the non-aqueous inkjet ink.