KR20060007763A - Ink composition - Google Patents

Abstract

The present invention is a colorant in the present invention; water; And it provides an ink composition comprising a compound represented by the formula (1).

<Formula 1>

Wherein X ₁ and X ₂ are each independently NR ″, O or S and R ″ is H, a substituted or unsubstituted C1-C20 alkyl group, and R ₁ and R ₂ are independently hydrogen, substituted or unsubstituted A substituted C1-C20 alkyl group, a substituted or unsubstituted C1-C20 alkenyl group, a substituted or unsubstituted C1-C20 alkynyl group, a substituted or unsubstituted C6-C20 aryl group, a substituted or unsubstituted C6 -C20 arylalkyl group, substituted or unsubstituted C1-C20 heteroalkyl group, substituted or unsubstituted C6-C20 heteroaryl group, or substituted or unsubstituted C6-C20 heteroarylalkyl group, or R ₁ and R ₂ is connected to each other to form a 5-12 atom ring. The ink composition of the present invention is excellent in storage stability even after long-term storage, and is rapidly dried in the media, thereby reducing the color bleeding, thereby realizing excellent image quality.

Description

Ink composition

The present invention relates to an inkjet ink composition, and more particularly, to an ink composition which is excellent in storage stability even after long-term storage, and which dries quickly in a media, thereby reducing inter-color bleeding, thereby realizing an excellent image.

An inkjet recording apparatus implements an image on media by ejecting ink droplets through a fine nozzle. Inkjet inks should have good drying characteristics on media, no smearing of images, even images of any media type, and color mixing at different color boundaries when printing multiple colors. The durability of the image (water resistance, light resistance, friction resistance) should be excellent. Various ink compositions have been proposed to satisfy these conditions. In particular, attempts have been made to increase the drying speed of the ink in order to enable high-speed printing and to prevent color mixing. Drying of the ink proceeds by two mechanisms: evaporation and penetration, which is determined by the vapor pressure of the ink, and the transmission is determined by the interfacial energy between the ink and the media. Diethylene glycol monobutyl ether was added to the ink in US Pat. Nos. 5,156, 675 as a kind of penetrant to lower the drying time of the ink by improving the permeation rate to the media and to reduce the mixing between colors. 5,196,056 added diethylene glycol monobutyl ether and surfynol 465 to the ink. US Pat. No. 6,132,502 issued diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, propylene glycol monobutyl ether, dipropylene. Disclosed is the addition of a water soluble emulsion with a glycol monobutyl ether such as glycol monobutyl ether to the ink.

In addition, US Patent No. 5,300, 143 discloses a method of adding a sulfone compound and a cyclic amide compound to the ink in order to reduce the drying time of the ink.

As described above, various ink compositions have been proposed, but there is room for improvement because it does not reach a level that satisfies basic performance, such as storage stability, rapid drying and reduction of color bleeding on ordinary paper, and image durability.

The technical problem to be achieved by the present invention is to provide an ink composition which is excellent in storage stability even after long-term storage, and which can dry quickly in the media and reduce color spreading, thereby realizing an excellent image.

In the present invention for achieving the above technical problem; water; And it provides an ink composition comprising a compound represented by the formula (1).

<Formula 1>                     

Wherein X ₁ and X ₂ are each independently NR ″, O or S

R ″ is H, a substituted or unsubstituted C1-C20 alkyl group,

R ₁ and R ₂ are each independently hydrogen, a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted C 1 -C 20 alkenyl group, a substituted or unsubstituted C 1 -C 20 alkynyl group, substituted or unsubstituted C6-C20 aryl group, substituted or unsubstituted C6-C20 arylalkyl group, substituted or unsubstituted C1-C20 heteroalkyl group, substituted or unsubstituted C6-C20 heteroaryl group, or substituted or unsubstituted C6-C20 heteroarylalkyl group, or R ₁ and R ₂ are connected to each other to form a 5-12 membered ring.

Hereinafter, the present invention will be described in more detail.

The ink composition of the present invention basically includes a colorant, water, and a compound represented by the following Chemical Formula 1.

<Formula 1>

Wherein X ₁ and X ₂ are each independently NR ″, O or S

R ″ is H, a substituted or unsubstituted C1-C20 alkyl group,

R ₁ and R ₂ are each independently hydrogen, a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted C 1 -C 20 alkenyl group, a substituted or unsubstituted C 1 -C 20 alkynyl group, substituted or unsubstituted C6-C20 aryl group, substituted or unsubstituted C6-C20 arylalkyl group, substituted or unsubstituted C1-C20 heteroalkyl group, substituted or unsubstituted C6-C20 heteroaryl group, or substituted or unsubstituted C6-C20 heteroarylalkyl group, or R ₁ and R ₂ are connected to each other to form a 5-12 membered ring.

When R ₁ and R ₂ in the compound of Formula 1 are connected to each other to form a 5-12 membered ring, they are represented by the following Formula 2.

 <Formula 2>

Wherein X ₁ and X ₂ are as described above,

n is an integer from 1 to 8,

R 'is a monosubstituted or polysubstituted substituent, which is hydrogen or a substituted or unsubstituted C1-C20 alkyl group, halogen atom, nitro group, sulfone group, amide group, substituted or unsubstituted C1-C20 alkyl group A phenyl group, a substituted or unsubstituted C6-C20 aryl sulfone group, a substituted or unsubstituted C1-C20 alkylamide group, a substituted or unsubstituted C6-C20 arylamide group, and a is 0 to 2n + 2 As a number, it is a number of 0-18.

As a specific example of the compound represented by Formula 1, ethyl cyclohexylethylthiocarbamate of Formula 3, 3-phenylthiazolidine-2,4-dione of Formula 4, 3-phenylthiazolidine-2,4 -dione), S-methyl ester thiocarbanilic acid of formula 5, S-propyl ester dipropylcarbamothioic acid of formula 6, 2, 4-thiazolidinone (2,4-thiazolidinedione), S-ethyl O-methyl thiocarbonate of the formula (7), diethadione of the formula (8), and the like, but not necessarily It is not limited only to this.

[Formula 3]

[Formula 4]

[Formula 5]

[Formula 6]

[Formula 7]

[Formula 8]

The content of the compound of Formula 1 is preferably 0.6 to 1,500 parts by weight, particularly 3 to 1,000 parts by weight based on 100 parts by weight of the colorant.                     

In the present invention, the compound of Formula 1 allows the ink to quickly penetrate the media, thereby rapidly drying the ink, and as a result, reduces the time for contact between different color inks at the interface, thereby reducing the color bleeding.

There is no particular limitation on the colorant used in the present invention. That is, it is possible to use both dyes that can be dissolved or dispersed in water, pigments that can be stably dispersed in water, self-dispersible pigments that can be stably dispersed in water without a separate dispersant, or mixtures thereof. Do.

Specific examples of the dye in the colorant are Food Black dyes, Food red dyes, Food Yellow dyes, Food Blue dyes, Acid Black dyes dyes, Acid Red dyes, Acid Blue dyes, Acid Yellow dyes, Direct Black dyes, Direct Blue dyes, Direct Direct yellow dyes, anthraquinone dyes, monooazo dyes, disazo dyes, phthalocyanine derivatives, and the like. Specific examples of the pigment include carbon black. , Graphite, vitreous carbon, activated charcoal, activated carbon, anthraquinone, phthalocyanine blue, phthalocyanine green, diazos, monooazos, pyranthrones, perylene,And Cri may include a money (quinacridone), indigoid based pigments (indigoid pigments) such as, but are not necessarily limited thereto.                     

The content of water in the ink composition is preferably 270 to 8,000 parts by weight based on 100 parts by weight of the colorant. If the water content is outside the above range, it is not preferable in terms of physical properties of the ink composition.

The ink composition of the present invention may further include one or more additives selected from the group consisting of cosolvents, wetting agents, surfactants, dispersants, viscosity regulators, pH regulators, and antioxidants. Here, the total content of the additives is 0.6 to 4,000 parts by weight based on 100 parts by weight of the colorant.

The ink composition may further include co-solvent. As the cosolvent, an organic solvent is mainly used, and serves to dissolve or disperse the colorant with water. Examples of cosolvents include alcohol compounds of methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, t-butyl alcohol or isobutyl alcohol; Ketone compounds of acetone, methyl ethyl ketone, diethyl ketone or diacetone alcohol; Ester compounds of methyl acetate, ethyl acetate or ethyl lactate; Ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol, 1,4-butanediol, 1,2,4-butanetriol, 1,5-pentanediol, 1,2,6-hexanetriol Polyhydric alcohol compounds of hexylene glycol, glycerol, glycerol ethoxylate or trimethylolpropane ethoxylate; Nitrogen compounds of 2-pyrrolidone or N-methyl-2-pyrrolidone; And sulfur-containing compounds of dimethyl sulfoxide, tetramethylenesulfone or thioglycol, but are not necessarily limited thereto. In the ink composition according to one embodiment and another embodiment of the present invention, the content of the cosolvent is preferably 6 to 100 parts by weight based on 100 parts by weight of water. And when using cosolvent with water, the total content of water and cosolvent is adjusted to the range of 270 to 9,000 parts by weight based on 100 parts by weight of the colorant.

The ink composition may further include a humectant. The humectant is for preventing the ink composition from clogging at the nozzle, and polyhydric alcohol is preferable. Specific examples of humectants include glycerin, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, hexylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 2- Butene-1, 4-diol, 2-methyl- 2-pentanediol, its mixture, etc. are mentioned, It is not necessarily limited to this. In the ink composition according to one embodiment and the other embodiment of the present invention, the content of the humectant is preferably 30 to 2,000 parts by weight based on 100 parts by weight of the colorant. If the content of the humectant is less than the above range, it is not preferable in terms of physical properties of the ink composition.

The ink composition may further include a surfactant to adjust the surface tension of the ink composition to stabilize jetting performance at the nozzle and to control the extent to which ink penetrates the media.

It is preferable to use anionic surfactant, cationic surfactant, or nonionic surfactant as said surfactant. Examples of the anionic surfactants include salts of alkyl carboxylic acids having 1 to 1000 carbon atoms (preferably salts of alkyl carboxylic acids having 10 to 200 carbon atoms) and salts of alcohol sulfonic acid esters having 1 to 1000 carbon atoms. Salts of alcohol sulfonic acid esters of 10 to 200 carbon atoms, salts of alkyl sulfonic acids of 1 to 1000 carbon atoms (preferably salts of alkyl sulfonic acids of 10 to 200 carbon atoms), salts of alkylbenzenesulfonic acids of 1 to 1000 carbon atoms (preferably Salts of alkylbenzenesulfonic acids having 10 to 200 carbon atoms), or mixtures thereof, but are not necessarily limited thereto. Examples of cationic surfactants include, but are not limited to, fatty acid amine salts, quaternary ammonium salts, sulfonium salts, phosphonium salts, salts thereof, mixtures thereof, and the like. Examples of the nonionic surfactants include polyoxyethylene alkyl ethers (wherein alkyl is an alkyl group having 1 to 1000 carbon atoms, preferably an alkyl group having 10 to 200 carbon atoms), and polyoxyethylene alkyl phenyl ether (where alkyl is carbon atoms). Alkyl groups of 1 to 1000, preferably alkyl groups of 10 to 200 carbon atoms, polyoxyethylene secondary alcohol ethers, polyoxyethylene-oxypropylene block copolymers, polyglycerin fatty acid esters, sorbitan fatty acid esters, mixtures thereof, and the like. Although it is mentioned, it is not necessarily limited to this.

In the ink composition according to one embodiment and the other embodiment of the present invention, the content of the surfactant is preferably 0.6 to 500 parts by weight based on 100 parts by weight of the colorant. If the content of the surfactant is outside the above range is not preferable in terms of the physical properties of the ink composition.

In addition, in the ink composition according to one embodiment and the other embodiment according to the present invention, when the colorant is not a self-dispersing pigment or a dye that does not dissolve in water, one or more kinds as necessary for the dispersion stability of the colorant Dispersants may be included. There is no particular limitation on the dispersant usable in the present invention. That is, a dispersant having a relatively simple structure and a low molecular weight, as well as a dispersant having a large molecular weight such as a block copolymer which may limit the physical properties, stability and functionality of the ink, may be used in the ink composition of the present invention. Specific examples of dispersants having a relatively low molecular weight and simple structure include polyvinyl alcohol (PVA), cellulose polymers, phenol oxide polymers modified with ethylene oxide, ethylene oxide / propylene oxide polymers, sodium poly Acrylate solution (TEGO, disperse 715W), modified polyacrylic resin solution (TEGO, disperse 735W), alkylol ammonium salt solution of low molecular polycarboxylic acid polymer (BYK-Chemie, Disperbyk), alkylol ammonium solution of multifunctional polymer ( BYK-Chemie, Disperbyk-181), or mixtures thereof, and the like, but is not necessarily limited thereto. Specific examples of the dispersant having a complicated structure and a high molecular weight include siloxane series such as polyether siloxane copolymer (TEGO, Wet KL 245 / Wet 260); Hydrophilic polymer of AB or BAB structure, wherein A is a hydrophobic homopolymer or copolymer of an unsubstituted or substituted C1-C30 acrylic monomer, and B is an unsubstituted or substituted C1 AB or BAB polymer of the hydrophilic polymer or copolymer of the acrylic monomer of 30 to 30) and the like, but is not necessarily limited thereto. More specific examples of the above-mentioned complex and molecular weight dispersants include acrylic acid / acrylate copolymers, methacrylic acid / methacrylate copolymers, and acrylic acid / polydialkylsiloxanes. / Acrylate block copolymer (acrylic acid / polydialkylsiloxane / acrylate block copolymer) or a mixture thereof may be used, but is not necessarily limited thereto.

In the ink composition according to one embodiment and the other embodiment of the present invention, the content of the dispersant is preferably 6 to 2,000 parts by weight based on 100 parts by weight of the colorant. If the content of the dispersant is out of the above range, the dispersibility of the ink composition is lowered, which is not preferable.

In the ink composition according to one embodiment and the other embodiment of the present invention, the ink composition may further include a viscosity modifier. The viscosity modifier serves to adjust the viscosity of the ink composition so that smooth spraying from the nozzle can be maintained. Specific examples thereof include, but are not limited to, casein, hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, and the like. The content of the viscosity modifier is preferably 0.6 to 500 parts by weight based on 100 parts by weight of the colorant. If the content of the viscosity modifier is out of the above range is not preferable in terms of the physical properties of the ink composition.

In addition, the ink composition may further include a pH adjusting agent, an antioxidant (antioxidant) and the like.

Hereinafter, a method of preparing an ink composition according to one embodiment and another embodiment of the present invention described above is as follows. That is, the colorant, water, and the compound of Formula 1 are mixed and, if necessary, a cosolvent, a humectant, a surfactant, a dispersant, a viscosity modifier, and the like are added and mixed, followed by stirring with a stirrer to make a uniform state. .                     

Thereafter, the resultant is passed through a filter to obtain an ink composition according to the present invention.

Specific examples of the unsubstituted C 1 -C 20 alkyl group in the general formula of the present invention include methyl, ethyl, propyl, isobutyl, sec-butyl, pentyl, iso-amyl, hexyl, and the like. The atom is a halogen atom, hydroxy group, nitro group, cyano group, amino group, amidino group, hydrazine, hydrazone, carboxyl group or salt thereof, sulfonic acid group or salt thereof, phosphoric acid or salt thereof, alkyl group of C1-C20, C2-C20 alke It may be substituted with a alkyl group, a C2-C20 alkynyl group, a C1-C20 heteroalkyl group, a C6-C20 aryl group, a C6-C20 arylalkyl group, a C6-C20 heteroaryl group, or a C6-C20 heteroarylalkyl group. .

The heteroalkyl group means that the alkyl group as defined above contains a nitrogen atom, a sulfur atom, an oxygen atom or a person atom. Examples thereof include methoxy, ethoxy, propoxy, butoxy and t-butoxy, and examples having substituents are fluoromethoxy, chloromethoxy, trifluoromethoxy, trifluoroethoxy, fluoro Haloalkoxy radicals such as ethoxy and fluoropropoxy. At least one hydrogen atom of these heteroalkyl groups may be substituted with the same substituent as in the alkyl group described above.

The unsubstituted C2-C20 alkenyl group means that it contains a carbon double bond in the middle or the end of the alkyl group as defined above. Examples are ethylene, propylene, butylene, hexylene and the like. At least one hydrogen atom of these alkenyl groups may be substituted with the same substituent as in the alkyl group described above.                     

The aryl group used alone or in combination means a carbocycle aromatic system having 6 to 20 carbon atoms containing one or more rings, which rings may be attached or fused together in a pendant manner. The term aryl includes aromatic radicals such as phenyl, naphthyl, tetrahydronaphthyl. The aryl group may have substituents such as haloalkylene, nitro, cyano, alkoxy and lower alkylamino. At least one hydrogen atom in the aryl group may be substituted with the same substituent as in the alkyl group described above.

The arylalkyl group means that some of the hydrogen atoms in the aryl group as defined above are substituted with radicals such as lower alkyl, for example methyl, ethyl, propyl and the like. For example benzyl, phenylethyl and the like. At least one hydrogen atom of the arylalkyl group may be substituted with the same substituent as in the alkyl group described above.

The heteroaryl group includes 1, 2 or 3 heteroatoms selected from N, O, P or S, and the remaining ring atoms are C 1-20 monovalent monocyclic or bicyclic aromatic divalent organic compounds having C. it means. At least one hydrogen atom of the hetero atoms may be substituted with the same substituent as in the alkyl group described above.

The heteroarylalkyl group means that a part of the hydrogen atoms of the heteroaryl group is substituted with an alkyl group. At least one hydrogen atom of the heteroarylalkyl group may be substituted with the same substituent as in the alkyl group described above.

Hereinafter, the present invention will be described with reference to the following examples, but the present invention is not limited only to the following examples.                     

Example 1

20 g of carbon black dispersion (20 wt% aqueous solution), 61.8 g of water, 2 g of S-ethyl O-methyl thiocarbonate of formula 7, 6 g of diethylene glycol, 10 g of ethylene glycol, and 0.2 g of Tween 20 were mixed and then mixed in a stirrer. Agitation was carried out for at least 30 minutes to make a uniform state.

The mixture was then passed through a 0.8 μm filter to produce a black ink composition.

Example 2

4 g of Acid Yellow 23, 75.8 g of water, 4 g of S-ethyl O-methyl thiocarbonate of formula 7, 6 g of diethylene glycol, 10 g of ethylene glycol, and 0.2 g of Tween 20 were mixed, followed by a stirrer for at least 30 minutes. Stir enough to make it uniform.

The mixture was then passed through a 0.45 μm filter to produce a color ink composition.

Comparative Example 1

20 g of a carbon black dispersion (20 wt% aqueous solution), 63.8 g of water, 6 g of diethylene glycol, 10 g of ethylene glycol, and 0.2 g of Tween 20 were mixed and then stirred in a stirrer for at least 30 minutes to make a uniform state. The mixture was then passed through a 0.8 μm filter to produce a black ink composition.

Comparative Example 2

4 g of Acid Yellow 23, 79.8 g of water, 6 g of diethylene glycol, 10 g of ethylene glycol, and 0.2 g of Tween 20 were mixed and then stirred in a stirrer for at least 30 minutes to make a uniform state. The mixture was then passed through a 0.45 μm filter to produce a color ink composition.

The properties of the ink composition prepared according to Example 1-2 were evaluated according to the following methods.

1) long-term storage stability

100 ml of the ink compositions obtained in Examples 1-2 and Comparative Examples 1-2 were placed in a heat-resistant glass bottle, and then the inlet was sealed and stored in a 60 ° C thermostat. This was left for 2 months and then evaluated by checking for the presence of sediment on the bottom.

Referring to Table 1, when the ink composition of Example 1-2 was used, all of the precipitates were not formed, it can be seen from this result that the storage stability is excellent.

2) Waterfastness test

After refilling the ink compositions obtained in Example 1-2 and Comparative Example 1-2 in ink cartridge M-50 (manufactured by Samsung) (black ink) or C-60 (manufactured by Samsung) (color ink), the printer (MJC-2400C, Samsung Electronics Co., Ltd.) printed a stick figure (2 * 10cm), dropped 5 drops of water after 5 minutes, dried it for 24 hours, and the water flowed down and expressed as a percentage compared to the OD of the original stick figure. Evaluation as follows to investigate the results are shown in Table 1 below.                     

A = (burn after water drips OD / OD in circle bar plot) ㅧ 100 (%)

 O: A> 95

△: 90 ≤ A <95

 X: A <90

Referring to Table 1, when using the ink composition of Example 1-2, it was confirmed that the water resistance is improved to A> 95 or more.

3) Bleeding resistance test

The ink compositions obtained in Examples 1-2 and Comparative Examples 1-2 were refilled in an ink cartridge M-50 (manufactured by Samsung) and then tested in a printer (MJC-2400C, made by Samsung) with C-60 (manufactured by Samsung) color inks. 30 minutes after the pattern was printed, the dot line position at which color mixing occurred when the reference was made between the border lines between two adjacent colors was measured by a microscope, and is shown in Table 1 below. (Evaluation criteria: US 5,854,307)

The degree of bleeding is evaluated based on the following.

5: Color mixing does not appear throughout the border.

4: Color mixing appears in the width corresponding to 1 dot diameter.

3: Color mixing appears in the width corresponding to 2 dot diameter.

2: 3 dot color mixing appears in the width as much as the diameter.

1: Color mixing appears at the width corresponding to 4 dot or more diameter (1 dot diameter = 100 ㎛ at 600dpi)

As a result of evaluation, when using the ink composition of Example 1-2, it turned out that bleeding resistance improves.

TABLE 1

Sample 1 Feed 2 Sample 3 Sample A Ink composition Black ink composition Color Ink Composition (Y) Black ink composition Color Ink Composition (Y) Black ink composition Color Ink Composition (Y) Black ink composition Color Ink Composition (Y) Example 1 Example 2 Example 1 Comparative Example 2 Comparative Example 1 Example 2 Comparative Example 1 Comparative Example 2 Storage stability ○ ○ ○ ○ ○ ○ ○ ○ Water resistance ○ ○ ○ X △ ○ △ X B / C color bleeding degree 5 4 4 2

The ink composition of the present invention is excellent in storage stability even after long-term storage, and is rapidly dried in the media, thereby reducing the color bleeding, thereby realizing excellent image quality.

Claims (7)

coloring agent; water; And An ink composition comprising a compound represented by the following formula (1). <Formula 1>

Wherein X ₁ and X ₂ are each independently NR ″, O or S R ″ is H, a substituted or unsubstituted C1-C20 alkyl group, R ₁ and R ₂ are each independently hydrogen, a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted C 1 -C 20 alkenyl group, a substituted or unsubstituted C 1 -C 20 alkynyl group, substituted or unsubstituted C6-C20 aryl group, substituted or unsubstituted C6-C20 arylalkyl group, substituted or unsubstituted C1-C20 heteroalkyl group, substituted or unsubstituted C6-C20 heteroaryl group, or substituted or unsubstituted C6-C20 heteroarylalkyl group, or R ₁ and R ₂ are connected to each other to form a 5-12 membered ring. The ink composition of claim 1, wherein the compound is represented by the following Chemical Formula 2. <Formula 2>

Wherein X ₁ and X ₂ are as defined in claim 1, n is an integer from 1 to 8, R 'is a monosubstituted or polysubstituted substituent, which is hydrogen or a substituted or unsubstituted C1-C20 alkyl group, halogen atom, nitro group, sulfone group, amide group, substituted or unsubstituted C1-C20 alkyl group Phone group, substituted or unsubstituted C6-C20 arylsulphone group, substituted or unsubstituted C1-C20 alkylamide group, substituted or unsubstituted C6-C20 arylamide group, a is a number from 0 to 2n + 2. The ink composition of claim 1, wherein the content of the compound of Formula 1 is 0.6 to 1,500 parts by weight based on 100 parts by weight of the colorant. The method of claim 1, wherein the compound of Formula 1 is ethyl cyclohexylethylthiocarbamate, 3-phenylthiazolidine-2,4-dione, S- S-methyl ester thiocarbanilic acid, S-propyl ester dipropylcarbamothioic acid, 2,4-thiazolidinedione , S-ethyl O-methyl thiocarbonate (S-ethyl O-methyl thiocarbonate) and diethadione (diethadione) ink composition, characterized in that selected from the group consisting of. The ink composition of claim 1, wherein the colorant is a dye, a pigment, a self-dispersing pigment, or a mixture thereof. The ink composition of claim 1, further comprising one or more additives selected from the group consisting of cosolvents, wetting agents, surfactants, dispersants, viscosity regulators, pH regulators, and antioxidants. The ink composition according to claim 6, wherein the total content of the additive is 0.6 to 4,000 parts by weight based on 100 parts by weight of the colorant.