TWI758407B - Ink composition and printed matter - Google Patents

Abstract

The solution is an ink composition, which is characterized by containing (A) a nonionic surfactant represented by a specific formula, water, (B) a water-soluble organic solvent with a solubility parameter (SP value) of 9.0 to 12.0, and The content of the coloring agent (A) component is 0.01 to 5 mass %. The effect is that the ink composition of the present invention has excellent wettability and permeability, no bleeding, excellent color development and image uniformity, and can also be adapted to high-speed printing and high-speed coating. In addition, since this ink composition shows a moderately low contact angle to media with poor absorption such as glossy paper, PP, PET, and PVC films, the ink dots are distributed independently, and there is no penetration, and the printing density and the color density of the printing image are Very dense, while showing very good printing properties.

Description

Ink composition and printed matter

The present invention relates to an ink composition and printed matter containing a nonionic surfactant, water, a water-soluble organic solvent and a colorant.

In recent years, in the printing industry, the development of water-based inks (water/low-volatility water-soluble organic solvent mixed system) has been continuously promoted based on eco-friendly orientations and the like. In response to this trend, media (recording media) with poor absorptivity, such as glossy paper, polypropylene (PP), polyethylene terephthalate (PET), and polyvinyl chloride (PVC) films, which have traditionally been the mainstream of organic solvent-based inks ) is also the same.

Especially for such a medium with poor absorbency, in a system (water/organic solvent mixed system) in which a part of the organic solvent of the ink is replaced with water, printing failure due to insufficient wettability occurs. Therefore, surfactants are generally added to such inks.

Nonionic surfactants such as polysiloxane-based surfactants and acetylene glycol-based surfactants are widely used in the ink and water-based paint industries. Modified polysiloxane compounds are known as polysiloxane-based surfactants, which are disclosed in Patent Documents 1 to 4 (JP 2003-253166 A, JP 2013-203910 A, JP 2005-A Ink compositions using polyether-modified polysiloxane are disclosed in Gazette No. 23253 and Japanese Patent Laid-Open No. 2005-120181).

However, printing on a medium with poor absorptivity by using only the ink using such a polysiloxane-based surfactant often fails to impart sufficient wettability, and thus a solution to this problem has been demanded. [Prior Art Literature] [Patent Literature]

[Patent Document 1] JP 2003-253166 A Bulletin No.

[The problem to be solved by the invention]

The present invention has been made in view of the above-mentioned facts, and is intended to provide an ink composition capable of exhibiting excellent wettability even when printing on media with poor absorptivity such as glossy paper, PP, PET, and PVC films, and to provide the same ink composition. The ink composition is intended to be printed on a recording medium. [Means of Solving Problems]

As a result of intensive research to achieve the above object, the inventors of the present application have newly discovered that the solubility parameter (SP value) of the organic solvent used in the ink composition and the wettability of the ink have a certain degree of correlation. That is, we found that when comparing organic solvents alone, using an organic solvent with a smaller SP value tends to be more excellent in the wettability of the ink composition. Therefore, in the mixed ink composition of water and organic solvent, if an organic solvent with a small SP value is used, an ink composition with excellent wettability is expected to be obtained.

However, even if the conventionally used surfactant is added to the above-mentioned mixed ink composition of water and organic solvent, the wettability cannot be significantly improved. Therefore, as a result of further investigations by the inventors of the present application, it was found that in the mixed ink composition of water/organic solvent using an organic solvent whose solubility parameter (SP value) is a smaller value of 12.0 or less, by using the optimum interface activity It is also known as the polysiloxane-based nonionic surfactant represented by the following formula (1), which can still exert excellent wetting properties when printing on media with poor absorptivity such as glossy paper, PP, PET, and PVC films. The ink dots are distributed independently, there is no infiltration, the printing density and the color density of the printing image are extremely dense, and the printing performance is extremely good, and the present invention is completed.

[式(1)中，m1為10以上之整數，n1為1以上之整數，R¹ 表示碳數為1～20之烷基、碳數為1～20之含羥基之烷基、碳數為1～20之含羧基之烷基、或下述式(2)所示之基]

[R² 為氫原子或碳數1～5之烷基，a為0～10的數，b為0～50的數；又，(C₂ H₄ O)單元及(C₃ H₆ O)單元不拘其順序，可為隨機或嵌段式]。 　　[2]如[1]之油墨組成物，其中上述(A)成分之式(1)之R¹ 的至少1個為上述式(2)所示之基。 　　[3]如[1]或[2]之油墨組成物，其中上述(A)成分之非離子性界面活性劑，其上述式(1)中的n1為1～5。 　　[4]如[1]～[3]中任一項之油墨組成物，其中上述(B)成分之水溶性有機溶劑的含量為5～40質量%。 　　[5]如[1]～[4]中任一項之油墨組成物，其中水與(B)成分之水溶性有機溶劑的比，以質量比計為95：5～60：40。 　　[6]一種印刷物，其特徵為具有由如上述[1]～[5]中任一項之油墨組成物所形成的印刷部。 [發明之效果]Accordingly, the present invention provides the following ink composition and a printed matter obtained by printing the ink composition on a recording medium. [1] An ink composition comprising (A) a nonionic surfactant represented by the following formula (1), water, and (B) water solubility having a solubility parameter (SP value) of 9.0 to 12.0 An organic solvent and a coloring agent, the content of the above-mentioned (A) component is 0.01 to 5 mass %;

[In formula (1), m1 is an integer of 10 or more, n1 is an integer of 1 or more, R ¹ represents an alkyl group having 1 to 20 carbon atoms, a hydroxyl group-containing alkyl group having 1 to 20 carbon atoms, and a carbon number of Carboxyl group-containing alkyl group of 1 to 20, or group represented by the following formula (2)]

[R ² is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, a is a number of 0 to 10, and b is a number of 0 to 50; and (C ₂ H ₄ O) unit and (C ₃ H ₆ O) The units are not in any order and can be random or block]. [2] The ink composition according to [1], wherein at least one of R ¹ in the formula (1) of the component (A) is a group represented by the formula (2). [3] The ink composition according to [1] or [2], wherein the nonionic surfactant of the component (A) above, wherein n1 in the above formula (1) is 1 to 5. [4] The ink composition according to any one of [1] to [3], wherein the content of the water-soluble organic solvent of the component (B) is 5 to 40% by mass. [5] The ink composition according to any one of [1] to [4], wherein the ratio of water to the water-soluble organic solvent of the component (B) is 95:5 to 60:40 in terms of mass ratio. [6] A printed matter characterized by having a printed portion formed of the ink composition according to any one of the above [1] to [5]. [Effect of invention]

The ink composition of the present invention has excellent wettability and permeability, no bleeding, excellent color development and image uniformity, and can also be adapted to high-speed printing and high-speed coating. In addition, since this ink composition shows a moderately low contact angle to media with poor absorption such as glossy paper, PP, PET, and PVC films, the ink dots are distributed independently, and there is no penetration, and the printing density and the color density of the printing image are Very dense, while showing very good printing properties.

[Form of implementing the invention]

The ink composition of the present invention contains a specific nonionic surfactant as the component (A), water, a water-soluble organic solvent exhibiting a specific solubility parameter (SP value) as the component (B), and a colorant.

(A) component is a nonionic surfactant represented by the following formula (1):

In the above formula (1), m1 is an integer of 10 or more, n1 is an integer of 1 or more, and R1 represents an alkyl group having ¹ to 20 carbon atoms, a hydroxyl group-containing alkyl group having 1 to 20 carbon atoms, and an alkyl group having 1 to 20 carbon atoms. The carboxyl group-containing alkyl group, or the group represented by the following formula (2).

In the above formula ( ₂ ), R ² is a hydrogen atom or an alkyl group having 1 to ₅ carbon atoms, a is a number of 0 to 10, and b is a number of 0 to 50; The C ₃ H ₆ O) units are not in any order and can be random or block.

In the above formula (1), m1 is an integer of 10 or more. When the nonionic surfactant of the above formula (1) in which m1 is an integer of 10 or more is used, when a solubility parameter (SP value) of 12.0 or less is used as a water-soluble organic solvent, excellent wettability is exhibited. Moreover, in said Formula (1), m1 is preferably an integer of 10-100, more preferably an integer of 10-60.

Moreover, in said Formula (1), n1 is an integer of 1 or more, Preferably it is an integer of 1-10, More preferably, it is an integer of 1-5. If the value of the above n1 deviates from the above range, the wettability of the ink may be insufficient.

R ¹ in the above formula (1) is preferably at least one, more preferably all of the groups represented by the formula (2). In this case, when the base represented by the above formula (2) is used as R ¹ in the above formula (1), the values of a and b in the formula are a=1 to 10, b=1 to 20, especially a=1～5, b=1～10 is appropriate. If the above-mentioned a or b value deviates from the above-mentioned range, the wettability of the ink may be insufficient.

The component (A) only needs to be represented by the above formula (1). In particular, the HLB is preferably 5 to 16, more preferably 5 to 8, and its performance is not necessarily related to HLB.

Here, HLB (hydrophilic group/hydrophobic group balance "Hydrophile-Lipophile Barance") is defined by the following formula (3) (Griffin method). HLB takes a value from 0 to 20, the closer the value is to 0, the higher the lipophilicity, and the closer to 20, the higher the hydrophilicity.

When the HLB of the nonionic surfactant represented by the above formula (1) is calculated, the hydrophilic part belongs to the (C ₂ H ₄ O) unit of R ¹ , a hydroxyl group, and a carboxyl group.

The content of the component (A) is 0.01 to 5.0 mass % in 100 mass % of the ink composition, preferably 0.05 to 5.0 mass %, and more preferably 0.1 to 5.0 mass %. (A) When content of a component exceeds 5.0 mass %, foaming or impregnation at the time of printing may be caused.

Moreover, 0.2-100 mass % is preferable, and, as for content of (A) component with respect to a coloring agent, 1-100 mass % is more preferable.

Further, the ink composition of the present invention contains water and a water-soluble organic solvent having a solubility parameter (SP value) as the component (B) of 9.0 to 12.0.

As the water contained in the ink composition of the present invention, for example, ion-exchanged water can be used. The content of water is preferably 55 to 95% by mass, and more preferably 60 to 80% by mass in 100% by mass of the ink composition.

於此，ΣE_coh 表示凝聚能(cal/mol)，ΣV表示莫耳分子體積(cm³ /mol)。

Examples of the water-soluble organic solvent of the component (B) include alkyl alcohols having 5 to 10 carbon atoms, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, and diethylene glycol monobutyl ether. Ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, acetone, etc., one or more of these can be appropriately selected and used, but the water-soluble organic solvent of component (B), its solubility parameter ( SP value) is 9.0 to 12.0. This solubility parameter (SP value) δ is a value obtained using Fedors' estimation method (RF Fedors: Polym. Eng. Sci., 14[2], 147-154 (1974)). In the Fedors estimation method, the SP value δ is obtained by substituting the values shown in Table 1 into the following formula (4) based on the molecular structure. In addition, the values shown in Table 1 are excerpts from the values proposed by Fedors.

Here, ΣE _coh represents cohesion energy (cal/mol), and ΣV represents molar molecular volume (cm ³ /mol).

For example, in the case of ethylene glycol monopropyl ether, it is obtained as follows.

Therefore, the solubility parameter (SP value) of ethylene glycol monopropyl ether here is "11.1".

If the solubility parameter (SP value) of the water-soluble organic solvent of the component (B) exceeds 12.0, the wettability of the ink may be insufficient, and if it is less than 9.0, the storage stability of the ink may be poor.

The content of the water-soluble organic solvent of the component (B) is preferably 5 to 40% by mass, more preferably 20 to 40% by mass in 100% by mass of the ink composition.

The content ratio of water and the water-soluble organic solvent of the component (B) is preferably 95:5 to 60:40 in terms of mass ratio, more preferably 80:20 to 60:40. The smaller the content of the water-soluble organic solvent, the less concern for environmental protection is preferred, but if it is too small, the wettability of the ink composition may be insufficient.

The ink composition of the present invention contains a colorant. As the colorant, dyes, organic pigments, and inorganic pigments can be suitably used. For example, as for dyes, those classified into acid dyes, direct dyes, reactive dyes, vat dyes, sulfur dyes, or food dyes according to the color index can be used, and colorants classified into oil-soluble dyes and basic dyes can also be used. . Moreover, as a pigment, carbon black (C.I. Pigment Black 7) such as furnace black (Color Black), lamp black, acetylene black, channel black, etc. is mentioned as a black ink, and specifically, Ravan is mentioned, for example 7000, Ravan 5750, Ravan 5250, Ravan 5000, Ravan 3500, Ravan 2000, Ravan 1500, Ravan 1250, Ravan 1200, Ravan 1190ULTRA-II, Ravan 1170, Ravan 1255 (the above are manufactured by COLUMBIA), Black Pearls L, Regal 400R , Regal 330R, Regal 660R, Mogul L, Monarch 700, Monarch 800, Monarch 880, Monarch 900, Monarch 1000, Monarch 1100, Monarch 1300, Monarch 1400, Valcan XC-72R (the above are manufactured by CABOT); Color Black FW1, Color Black FW2, Color Black FW2V, Color Black FW18, Color Black FW200, Color Black S150, Color Black S160, Color Black S170, Printex 35, Printex U, Printex V, Printex 140U, Printex 140V, Special Black 6, Special Black 5 , Special Black 4A, Special Black 4 (the above are manufactured by Degussa Corporation); No.25, No.33, No.40, No.47, No.52, No.900, No.2300, MCF-88, MA600, Organic pigments such as MA7, MA8, MA100 (the above are manufactured by Mitsubishi Chemical Corporation), or metals such as copper oxide, iron oxide (C.I. Pigment Black 11), and titanium oxide, and aniline black (C.I. Pigment Black 1). Furthermore, as a color ink, C.I. Pigment Yellow 1 (Fast Yellow G), 3, 12 (Disazo Yellow AAA), 13, 14, 17, 24, 34, 35, 37, 42 (Yellow Oxidation Yellow) can be used. Iron), 53, 55, 74, 81, 83 (disazo yellow HR), 93, 94, 95, 97, 98, 100, 101, 104, 108, 109, 110, 117, 120, 128, 138, 153, 180, C.I. Pigment Red 1, 2, 3, 5, 17, 22 (sunfast bright scarlet), 23, 31, 38, 48:2 (permanent red 2B (Ba)), 48:2 (permanent red) Red 2B(Ca)), 48:3(Permanent Red 2B(Sr)), 48:4(Permanent Red 2B(Mn)), 49:1, 52:2, 53:1, 57:1(bright Magenta 6B), 60:1, 63:1, 63:2, 64:1, 81 (Rose Red 6G Lake), 83, 88, 101 (Iron Red), 104, 105, 106, 108 (Cadmium Red) , 112, 114, 122 (quinacridone magenta), 123, 146, 149, 166, 168, 170, 172, 177, 178, 179, 185, 190, 193, 202, 206, 209, 219, C.I. Pigment Violet 19, 23, C.I. Pigment Orange 36, C.I. Pigment Blue 1, 2, 15 (phthalocyanine blue R), 15:1, 15:2, 15:3 (phthalocyanine blue G), 15:4, 15:6 ( Phthalocyanine Blue E), 16, 17: 1, 56, 60, 63, C.I. Pigment Green 1, 4, 7, 8, 10, 17, 18, 36, etc. The blending amount of the colorant is preferably 0.1 to 15% by mass, more preferably 2 to 10% by mass in 100% by mass of the ink composition.

The ink composition of the present invention can be obtained, for example, by mixing the above-mentioned components by a known mixing and preparation method such as a propeller mixer. In addition, the component which is solid at normal temperature may be heated and mixed as needed.

In the ink composition of the present invention, resin or other additives may also be added as required. For resin, it is a polymer with hydrophobic group and hydrophilic group; preferably, the hydrophobic group of the substance forming the polymer is at least one or more selected from alkyl, cycloalkyl or aryl. Furthermore, it is preferable that the hydrophilic group is at least a carboxyl group, a sulfonic acid group, a hydroxyl group, an amine group, or an amide group or a base thereof. As specific examples of the substances forming the dispersed polymers, monomers or oligomers having a double bond, acryl group, methacryloyl group, vinyl group, or aromatic group can be used. For example, if p-styrene, tetrahydrofurfuryl acrylate, butyl methacrylate, (α,2,3 or 4)-alkylstyrene, (α,2,3 or 4)-alkoxystyrene, 3,4-Dimethylstyrene, α-phenylstyrene, divinylbenzene, vinylnaphthalene, dimethylamino (meth)acrylate, dimethylaminoethyl (meth)acrylate , dimethylaminopropyl acrylamide, N,N-dimethylaminoethyl acrylate, propylene morpholine, N,N-dimethyl acrylamide, N-isopropyl acrylamide , N,N-diethylacrylamide, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, ethylhexyl (meth)acrylate, other (meth)acrylate base) alkyl acrylate, methoxydiethylene glycol (meth)acrylate, ethoxy, propoxy, butoxy diethylene glycol or polyethylene glycol (meth)acrylate, Cyclohexyl (meth)acrylate, Benzyl (meth)acrylate, phenoxyethyl (meth)acrylate, isobornyl (meth)acrylate, hydroxyalkyl (meth)acrylate, other containing Fluorine, chlorine-containing, silicon-containing (meth)acrylates, (meth)acrylamides, maleate amides, (meth)acrylic acids, etc. other than monofunctional, can be used when introducing a cross-linked structure. Di, tri, tetra, poly) ethylene glycol di(meth)acrylate, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol and 1,10-decanediol (meth)acrylate, trimethylolpropane tri(meth)acrylate, glycerol (di, tri)(meth)acrylate, bisphenol A or F ring Ethylene oxide adduct of di(meth)acrylate, neopentylglycol di(meth)acrylate, neopentaerythritol tetra(meth)acrylate, dipeptaerythritol hexa(meth)acrylate Compounds having acryl or methacryloyl groups such as esters.

The blending amount of the resin is not particularly limited, but is preferably 0 to 30% by mass, and more preferably 0 to 20% by mass in 100% by mass of the ink composition. In addition, when the resin is blended, it is preferably 1 mass % or more.

As other additives, ultraviolet absorbers, antioxidants, pH adjusters, preservatives, viscosity adjusters, and the like can be appropriately blended. These additives can be blended in the remainder of 100% by mass of the ink composition.

The ink composition preferably has a viscosity (23°C) of 4 mPa·s or less (excluding 0), so that excellent printing characteristics can be exhibited.

The ink composition of the present invention is coated and printed on a recording medium as an ink, and can obtain no bleeding, excellent color development and image uniformity, and no bleeding, printing density, and color density of printed images. Very dense print.

Examples of methods for applying ink to a recording medium and printing methods include an ink jet recording method, a recording method using a writing instrument such as a pen, and other well-known printing methods. In particular, the ink composition of the present invention can be preferably used in the ink jet recording method, and can also be used for high-speed printing and high-speed coating.

Furthermore, the ink composition of the present invention is intended for printing on a recording medium, and is particularly suitable for coating on a low-absorptive recording medium and a non-absorptive recording medium. It does not specifically limit as a low absorption recording medium, For example, the coated paper provided with the coating layer which accommodates the oily ink on the surface is mentioned. It does not specifically limit as a coated paper, For example, the actual printing paper (actual printing stock) represented by a coated paper, a coated paper, and a matte paper is mentioned. The non-absorptive recording medium is not particularly limited, and examples thereof include a plastic film without an ink-absorbing layer, a substrate typified by paper coated with plastic, or a plastic film followed. As the plastics referred to here, polyvinyl chloride (PVC), polyethylene terephthalate (PET), polycarbonate, polystyrene, polyurethane, polyethylene, polypropylene ( PP) etc. [Example]

The following examples and comparative examples are shown to specifically describe the present invention, but the present invention is not limited to the following examples.

[Example 1] A nonionic surfactant (A-1) [HLB] having m1=10, n1=3, a=3, b=1, R ² = 5], and the composition is shown in Table 3 to prepare an ink composition.

5.0 mass % of Color Black S170 (manufactured by Degussa Corporation) as a black pigment was gradually added to 64.5 mass % of ion-exchanged water while stirring with a propeller mixer, and then 0.5 mass % of a nonionic surfactant (A -1), 30.0 mass % ethylene glycol monopropyl ether (SP value: 11.1) (B-1), and stirred for 1 hour to obtain a black (B) ink composition.

Furthermore, a magenta pigment (C.I. Pigment Red 122), a cyan pigment (C.I. Pigment Blue 15:3), and a yellow pigment (C.I. Pigment Yellow 74) were used in place of the black pigment, and magenta (M) was prepared in the same manner as above. , Cyan (C), Yellow (Y) ink composition.

The following evaluations were carried out for each of the produced ink compositions. The results are shown in Table 3.

(1) Printing density PX-045A manufactured by Seiko Epson was used to print ink dots on OK Topcoat Paper (manufactured by Oji Paper) using black ink, and the printing density was measured with a Sakura microdensitometer PDM-5 (manufactured by SAKURA SEIKI). The printing density is preferably 0.99 to 1.10, more preferably 1.01 to 1.10.

(2) Dot diameter PX-045A manufactured by Seiko Epson was used to print on OK Topcoat Paper with black ink, magnify 100 times, and measure the dot diameter. The spot diameter is preferably 200 to 250 μm, more preferably 220 to 240 μm.

(3) Color density of printed image Black (B), magenta (M), cyan (C), and yellow (Y) inks were solid-printed on OK Topcoat Paper using PX-045A manufactured by Seiko Epson, and measured as RD by Macbeth density -918 (manufactured by Macbeth) was measured. The color density is preferably 1.30 to 2.00, more preferably 1.40 to 2.00.

(4) Image uniformity Black (B), magenta (M), cyan (C), and yellow (Y) inks were printed on OK Topcoat Paper with PX-045A manufactured by Seiko Epson. The printed matter was magnified 100 times with an electron microscope, and the flatness was evaluated according to the following criteria. ○: Almost no density difference △: Only slight density difference ×: A crescent-shaped mottled pattern can be seen within the ink dots

(5) Contact angle The contact angle values of various surfactant solutions on OK Topcoat Paper, PP, PET, and PVC were measured after 0.3 seconds using a contact angle meter CA-D manufactured by Kyowa Interface Science Co., Ltd.

[Examples 2 to 11 and Comparative Examples 1 to 15] In the same manner as in Example 1, ink compositions were prepared with the compositions shown in Tables 3 to 5 and evaluated. The evaluation results are shown in Table 3 (Examples 2 to 11), Table 4 (Comparative Examples 1 to 8), and Table 5 (Comparative Examples 9 to 15). In addition, about Examples 2-11 and Comparative Examples 1-15, the following (A) nonionic surfactant and (B) water-soluble organic solvent were used.

(A-1): In formula (1) and formula (2), m1=10, n1=3, a=3, b=1 and R ² =H nonionic surfactant [HLB=5] ( A-2): In formula (1) and formula (2), m1=30, n1=3, a=3, b=8 and R ² =CH ₃ nonionic surfactant [HLB=5] ( A-3): In formula (1) and formula (2), m1=60, n1=3, a=3, b=1 and R ² =H nonionic surfactant [HLB=5] (A -4): In formula (1) and formula (2), m1=1, n1=1, a=3, b=8 and R ² =CH ₃ nonionic surfactant [HLB=4] (A -5): In formula (1) and formula (2), m1=8, n1=1, a=3, b=8 and R ² =CH ₃ nonionic surfactant [HLB=4] (A -6): In formula (1) and formula (2), m1=8, n1=3, a=3, b=1 and R ² =H nonionic surfactant [HLB=5] (A- 7): In formula (1) and formula (2), m1=0, n1=1, a=1, b=0 and R ² =H nonionic surfactant [HLB=5] (B-1 ): Ethylene glycol monopropyl ether (SP value: 11.1) (B-2): Ethylene glycol monobutyl ether (SP value: 10.8) (B-3): Acetone (SP value: 9.1) (B- 4): Propylene glycol (SP value: 15.9) (B-5): Diethylene glycol (SP value: 15.0)

Claims (6)

An ink composition is characterized by containing (A) a nonionic surfactant represented by the following formula (1), water, (B) a water-soluble organic solvent with a solubility parameter (SP value) of 9.0 to 12.0, With the coloring agent, the content of the above-mentioned (A) component is 0.1 to 5% by mass; the above-mentioned water-soluble organic solvent is selected from the alkyl alcohols with 5 to 10 carbon atoms, diethylene glycol monoethyl ether, and diethylene glycol The group of monopropyl ether, diethylene glycol monobutyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, and acetone;

[In formula (1), m1 is an integer of 10 or more, n1 is an integer of 1 or more, R ¹ represents an alkyl group having 1 to 20 carbon atoms, an alkyl group containing 1 to 20 carbon atoms, and an alkyl group having 1 to 20 carbon atoms. The alkyl group containing carboxyl group, or the group represented by the following formula (2)]-C ₃ H ₆ O-(C ₂ H ₄ O) _a -(C ₃ H ₆ O) _b -R ² (2)[ R ² is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, a is a number of 0 to 10, and b is a number of 0 to 50; and, (C ₂ H ₄ O) unit and (C ₃ H ₆ O) unit Irrespective of the order, it can be random or block]. The ink composition according to claim 1, wherein at least one of R ¹ in the formula (1) of the component (A) is a group represented by the formula (2). The ink composition according to claim 1 or 2, wherein the nonionic surfactant of the component (A), n1 in the above formula (1) is 1 to 5. The ink composition according to claim 1 or 2, wherein the content of the water-soluble organic solvent of the component (B) is 5 to 40% by mass. The ink composition of claim 1 or 2, wherein the ratio of water to the water-soluble organic solvent of component (B) is 95:5 to 60:40 in terms of mass ratio. A printed matter characterized by having a printing portion formed of the ink composition according to any one of claims 1 to 5.