KR20090075619A - Capsulated colorant, method of the same, and Ink composition including the same - Google Patents

Abstract

A capsulated colorant is provided to form an ink composition implementing a character with excellent water resistance, light-proof, abrasion resistance, and optical density and an image with excellent durability and printing gloss. A capsulated colorant comprises a coloring agent and a polymer resin coating the coloring agent. The polymer resin is cross-linked to have the degree of swelling of about 10-150 %. The polymer resin is obtained by polymerizing a composition containing a polymerizable unsaturated monomer, a cross-linking agent and a polymerization initiator.

Description

Encapsulated colorant, preparation method thereof, ink composition including the encapsulated colorant {Capsulated colorant, method of the same, and Ink composition including the same}

Encapsulated colorants, methods of making the same, and ink compositions comprising the encapsulated colorants are disclosed.

In inkjet printers, a material which exhibits a unique color by selectively absorbing or reflecting visible light is generally called a colorant, and the colorant can be classified as a dye and a pigment.

A dye is a coloring agent which has a fastness to the dye, such as fiber, leather, fur, paper, etc., in a certain way, and has a high degree of fastness to sun washing, friction, etc., and the pigment is a fine particle having a coloring agent, and is not directly dyed on the surface of the dye. It is attached to the surface of the salt by adhesion, etc.) to give a unique color.

The dye is mixed and dissolved in a solvent such as water, but since the pigment is generally insoluble in a solvent such as water, it is most important to uniformly disperse the pigment fine particles in the solution so as to permanently maintain the dispersed state that is not reaggregated.

Water-soluble dye-type ink has a very long-term storage stability, uniformity is maintained, color and brightness is clear, while there is a disadvantage in water resistance, light resistance and the like.

Pigment type ink has a high optical density (OD), has excellent water resistance and light resistance, has less blurring between colors, has poor color clarity, and long-term storage stability is inferior to dye type ink. In addition, the image on which the pigment-type ink is printed is poorly rubbed in dry and wet conditions, that is, wear resistance.

In addition, when color printing (multicolor printing) with dyes or pigments, there is a problem in that bleeding occurs at each color boundary, resulting in deterioration of image sharpness.

Accordingly, there is a need for an ink composition that has improved storage gloss and wear resistance while maintaining excellent storage stability of the water-soluble dye type ink and excellent water resistance of the pigment type ink.

On the other hand, in order to improve the wear resistance of the ink, a technique of adding a resin to the ink composition has been proposed, but the problem regarding the increase in ink viscosity due to the addition of the resin is still not solved. Moreover, although the technique of adding resin particles to the ink for the purpose of suppressing the viscosity increase of the ink has been proposed, in this ink, the resin particles and the pigment were in a dispersed state separately, which was insufficient for improvement in wear resistance.

Therefore, there is a limit to improve the above problems by adding a new additive to the ink composition, the situation is required to improve the properties of the ink composition through the modification of the colorant itself.

According to an embodiment of the present invention, by controlling the degree of swelling of the polymer resin coating the colorant, it is possible to realize images having excellent water resistance, light resistance, wear resistance, optical density, and excellent durability as well as printing gloss. Encapsulating colorants used in ink compositions which can be used, methods for preparing the same, ink compositions comprising the encapsulating colorants, ink sets comprising two or more of the ink compositions, cartridges for inkjet recording devices comprising the ink sets, and the inkjets An inkjet recording apparatus including a cartridge for a recording apparatus is provided.

Encapsulation colorant according to an embodiment of the present invention is a colorant; And a polymer resin covering the colorant, and the polymer resin is crosslinked to have an expansion degree of 10 to 150%.

According to one embodiment of the present invention, a method of preparing an encapsulating colorant may include emulsifying a polymerization composition comprising a polymerizable unsaturated monomer, an aqueous medium, a colorant, a crosslinking agent, a chain transfer agent, an emulsifier, and a polymerization initiator; And

Polymerizing the polymerizable unsaturated monomer and the crosslinking agent on the colorant to form a polymer resin covering the colorant, wherein the polymer resin is crosslinked to have an expansion degree of 10 to 150%.

An ink composition according to an embodiment of the present invention includes the encapsulating colorant.

Ink composition according to an embodiment of the present invention is a solvent; An encapsulation colorant comprising a polymer resin having a crosslinked structure, wherein the encapsulation colorant has a plurality of printing gloss and optical density according to the degree of expansion of the crosslinked polymer resin.

An ink set according to an embodiment of the present invention includes two or more kinds of the ink composition.

A cartridge for an ink jet recording apparatus according to an embodiment of the present invention includes the ink set.

An ink jet recording apparatus according to an embodiment of the present invention includes the cartridge for the ink jet recording apparatus.

According to one embodiment of the present invention as described above, by adjusting the degree of expansion of the polymer resin in the encapsulation colorant coating the surface of the colorant with a polymer resin having a crosslinked structure, the encapsulation colorant coated with a polymer resin having a low expansion The ink composition containing the ink prints, and the ink composition containing the encapsulating colorant coated with a high-expansion polymer resin is used to print the image, the character and the water resistance, light resistance, abrasion resistance, optical density (Good Optical Density) and Not only durability but also printing gloss can be realized at the same time.

It will be described in more detail below.

One embodiment of the present invention is a colorant; And a polymer resin coating the colorant, wherein the polymer resin is crosslinked such that the polymer resin has an expansion degree of 10 to 150%.

The colorant may be used both dyes and pigments, and any color may be used without limitation. That is, direct dyes, acid dyes, food dyes, alkaline dyes, reactive dyes, disperse dyes, oil dyes, various pigments, self-dispersible pigments, or mixtures thereof can all be used.

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 Yellow Direct yellow dyes, anthraquinone dyes, monooazo dyes, diazo 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, quina And quinacridone and indigoid pigments. Examples of self-dispersed pigments include cabojet series or CW-series of Orient Chemical. It is not limited only.

The polymer resin may be prepared by polymerizing a composition including a polymerizable unsaturated monomer, a crosslinking agent, and an initiator.

Wherein the polymerizable unsaturated monomer is unsaturated carboxylic acid, vinyl cyanide monomer, unsaturated carboxylic acid alkyl ester, unsaturated carboxylic hydroxyalkyl ester, unsaturated carboxylic acid amide and derivative, aromatic vinyl monomer, methyl vinyl ketone, and One or more selected from the group consisting of vinylidene chloride can be used.

Specifically, the unsaturated carboxylic acid is at least one selected from the group consisting of methacrylic acid, acrylic acid, itaconic acid, crotonic acid, fururic acid, and maleic acid; The unsaturated polycarboxylic acid alkyl ester is at least one selected from the group consisting of itaconic acid monoethyl ester, fumaric acid monobutyl ester, and maleic acid monobutyl ester; The vinyl cyanide monomer may be acrylonitrile or methacrylonitrile; The unsaturated carboxylic acid amide is acrylamide, methacrylamide, itaconeamide, or maleic acid monoamide or a derivative thereof; And an aromatic vinyl monomer may be selected from the group consisting of α-methylstyrene, vinyltoluene, or P-methylstyrene.

By providing the crosslinking structure to the polymer resin coated on the colorant, the crosslinking agent may provide an effect of coating the dense polymer resin in the form of a mesh to the encapsulation colorant according to an embodiment of the present invention, and as a result, the encapsulation colorant Also in the ink composition comprising a cross-linked polymer resin can be provided an effect of the difference in the printing gloss and optical concentration according to the degree of expansion.

The crosslinking agent may be selected from the group consisting of an aldehyde crosslinking agent, an epoxy crosslinking agent and a carbodiimide crosslinking agent.

The aldehyde-based crosslinking agent may be formaldehyde, a compound represented by Formula 1 or dextrin aldehyde, and examples of the compound represented by Formula 1 include glutaraldehyde, glyoxal, succinaldehyde, adialdehyde, and the like. It is not limited to this.

[Formula 1]

Wherein n = 1 to 10.

As said epoxy type crosslinking agent, it is a compound represented by following formula (2).

[Formula 2]

(a는 1 내지 30의 정수이고, 상기 메틸렌기 중 하나 이상은 방향족, 산소 등으로 치환 가능 하다) 이다. Wherein m = 1 to 10 and X is halogen or

(a is an integer of 1 to 30, and at least one of the methylene groups can be substituted by aromatic, oxygen, etc.).

Specific examples of the epoxy-based crosslinking agent include epichlorohydrin, ethylene glycol diglycidyl ether, resorcinol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycid Dyl ether, hydrogenated bisphenol A diglycidyl ether, polybutadiene diglycidyl ether, diethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, dipropylene glycol diglycidyl ether, polypropylene glycol di Glycidyl ether, sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, glycerol polyglycidyl ether or trimethylolpropane polyglycid Dill ether and the like, but are not limited thereto.

Examples of the carbodiimide crosslinking agent include 1-ethyl-3 (3-dimethylamino propyl carboimide) dicyclocarbodiimide, 1-ethyl-3 (2-morpholinyl-4-methyl) carbodiimide, and the like. It is not limited.

The polymer resin has a different degree of expansion according to the type and degree of crosslinking of the polymerizable monomer used at this time, the coloring agent surrounded by a high expansion polymer resin expresses the soft properties and the coloring agent surrounded by a small expansion polymer resin Since the hard properties are expressed, the degree of hardness of the shell (shell) portion of the colorant can be adjusted differently to realize high optical density when printing characters, and high printing gloss can be expressed when printing images.

Thus, the polymeric resin of the encapsulating colorant according to one embodiment of the invention has, for example, about 10 to about 150%, about 60 to about 100% swelling degree.

The degree of expansion of the polymer resin is expressed as a percentage of the increase in weight when the maximum amount of water is contained relative to the dry weight from which the water is completely removed from the polymer resin. When the degree of crosslinking of the polymer resin is small, the water penetrates from the outside. Due to the high degree of deformation of the polymer structure, the content of moisture remaining in the polymer resin increases. However, when the degree of crosslinking is high, the polymer structure is rigid and the probability of infiltration and expansion of water decreases. The amount of moisture that can be reduced is reduced. Accordingly, the degree of crosslinking of the polymer resin can be evaluated using the numerical value of the degree of expansion.

The degree of expansion can be measured by the following method.

That is, after separating the encapsulated colorant coated with the polymerized polymer resin using a centrifuge, the weight is measured, and the encapsulated colorant is dried in an oven at about 70 ° C. for about 10 hours and the weight thereof is measured. Thereafter, the degree of expansion may be measured using the following equation.

% Expansion = [(WW-DW) / DW] ㅧ 100

WW: Weight of the encapsulated colorant after separation using a centrifuge (g)

DW: dry weight of encapsulating colorant (g)

If the swelling degree is less than about 10%, a linear polymer resin having a small amount of crosslinking is formed, and thus it is not effective to surround the colorant. If the expansion degree is greater than about 150%, the capsule wall of the colorant, that is, the thickness of the crosslinking is too thick, so that the color is well formed. You may not be able to shoot.

In addition, according to one embodiment of the invention, the step of emulsifying a polymerization composition comprising a polymerizable unsaturated monomer, an aqueous medium, a colorant, a crosslinking agent, a chain transfer agent, an emulsifier and a polymerization initiator; And

Forming a polymer resin covering the colorant by polymerizing the polymerizable unsaturated monomer and the crosslinking agent on the colorant, wherein the polymer resin is crosslinked such that the polymer resin has an expansion degree of about 10 to about 150%. This is presented.

The polymerizable unsaturated monomers include unsaturated carboxylic acids, vinyl cyanide monomers, unsaturated carboxylic acid alkyl esters, unsaturated carboxylic hydroxyalkyl esters, unsaturated carboxylic acid amides and derivatives, and aromatic vinyl monomers as described above. One or more selected from the group can be used.

As the aqueous medium, water or a mixed solution of water and an organic solvent is used. The content of the aqueous medium is, for example, about 500 to about 5,000 parts by weight, about 1,500 to about 3,000 parts by weight based on 100 parts by weight of the polymerizable unsaturated monomer. If the content is less than about 500 parts by weight, the reaction proceeds too fast and the thickness of the resin to be coated becomes too thick. If the content is greater than about 5,000 parts by weight, the monomer is difficult to move to each reaction site, so the reaction proceeds too slowly, The coating can be difficult.

As the colorant, as described above, direct dyes, acid dyes, food dyes, alkaline dyes, reactive dyes, disperse dyes, oil dyes, various pigments, self-dispersible pigments, or mixtures thereof may be used.

The content of the colorant is, for example, about 0.1 to about 20 parts by weight and about 1 to about 5 parts by weight based on 100 parts by weight of the polymerizable unsaturated monomer. When the content is less than about 0.1 parts by weight, the optical concentration is lowered, and when the content is more than about 20 parts by weight, the stability of the colorant may be deteriorated.

As described above, the crosslinking agent may be selected from the group consisting of an aldehyde crosslinking agent, an epoxy crosslinking agent, and a carbodiimide crosslinking agent.

The content of the crosslinking agent is, for example, about 1 to about 20 parts by weight and about 1 to about 10 parts by weight based on 100 parts by weight of the polymerizable unsaturated monomer. If the content is less than about 1 part by weight, the amount of crosslinking may be small, so that the bonding with the colorant may not be sufficient, and when the content is greater than about 20 parts by weight, the crosslinking may occur too much and it may be difficult to fuse the printing medium.

The emulsifier may be a nonionic, anionic or ampholytic emulsifier containing both.

The content of the emulsifier is, for example, about 0.01 to about 10 parts by weight, about 0.1 to about 7 parts by weight based on 100 parts by weight of the polymerizable unsaturated monomer. If the content is less than about 0.01 parts by weight, the emulsion concentration may be less than the critical emulsion concentration. If the content is more than about 10 parts by weight, foaming may occur a lot after the completion of the reaction due to the use of an excessive emulsifier.

As the emulsification method, a direct emulsification method is used in which the dispersion of the colorant in the polymerizable unsaturated monomer is emulsified in an aqueous medium to which an emulsifier is added using a disperser such as a homomixer, a line mixer or a high pressure homogenizer, or the polymerizable unsaturated monomer. After adding an emulsifier to the dispersion of a coloring agent in the inside, the natural emulsification method of pouring this mixture in a large amount of water can be used.

Moreover, after adding an emulsifier to the dispersion of a coloring agent in a polymerizable unsaturated monomer, the phase transition emulsification method which adds water little by little to this mixture can be used, stirring this mixture.

As the polymerization initiator, a redox composition composed of a combination of a water-soluble or fat-soluble persulfate, a peroxide, an azo compound or a peroxide and a reducing agent such as sulfite can be used. Examples thereof include ammonium persulfate, potassium persulfate, sodium persulfate, hydrogen peroxide, t-butyl hydroperoxide, t-butyl peroxybenzoate, 2,2-azobis-isobutyronitrile, 2,2-azobis (2-diaminopropane) hydrochloride and 2,2-azobis (2,4-dimethylvaleronitrile).

The content of the polymerization initiator is, for example, about 0.05 to about 3 parts by weight, about 0.5 to about 1.5 parts by weight based on 100 parts by weight of the polymerizable unsaturated monomer. When the content is less than about 0.05 parts by weight, the reaction is not started well, so the reaction occurs too slowly. When the content is more than about 3 parts by weight, the reaction rate is too fast, making it difficult to control the reaction rate.

The polymerization initiator may be added at the beginning of the reaction together with other raw materials participating in the polymerization reaction, that is, a polymerizable unsaturated monomer, an aqueous medium, a colorant, a crosslinking agent, a chain transfer agent, and an emulsifier, and the other raw materials are first emulsified and then heated up. It may be added afterwards. At this time, the former has a feature that is difficult to control the reaction rate, the latter has a feature that is easy to control the reaction rate.

In addition, if necessary, the polymerizable composition may further include an additive, for example, an ultraviolet absorber, an antioxidant, and a color improving agent.

In the method for producing an encapsulating colorant according to an embodiment of the present invention, by controlling the content of the crosslinking agent, the degree of crosslinking of the polymer resin may be changed. As a result, it is possible to control the degree of expansion of the crosslinked polymer resin, thereby producing an encapsulated colorant coated with a polymer resin having a different degree of expansion.

When the content of the crosslinking agent is about 4.2 to about 20 parts by weight based on 100 parts by weight of the polymerizable unsaturated monomer, the degree of expansion of the polymer resin is about 10 to about 70%, and the content of the crosslinking agent is about 1 to about 4 weight In denier, the degree of expansion of the polymer resin is from about 90 to about 150%.

In addition, according to one embodiment of the present invention, there is provided an ink composition comprising the encapsulating colorant and a solvent.

In the ink composition according to an embodiment of the present invention, the content of the encapsulating colorant is, for example, about 1 to about 20 parts by weight, about 2 to about 10 parts by weight, and about 3 to about 7 based on 100 parts by weight of the ink composition. Parts by weight.

If the content is less than about 1 part by weight, it is difficult to achieve a desired optical density, and when the content is greater than about 20 parts by weight, the inkjet ejection performance may be deteriorated due to a high concentration and low storage stability.

The solvent includes an aqueous solvent such as water or one or more organic solvents. Such a solvent may be used, for example, in an amount of about 80 to about 99 parts by weight, about 85 to about 98 parts by weight, and about 90 to about 97 parts by weight based on 100 parts by weight of the ink composition.

When the content of the solvent is less than about 80 parts by weight, the viscosity of the ink composition may be excessively high, so that the ejection performance may be lowered.

The organic solvent included in the solvent may be one or more selected from the group consisting of monohydric alcohol solvents, polyhydric alcohol solvents, ketone solvents, ester solvents, nitrogen-containing solvents, and sulfur-containing solvents.

Monohydric alcohol solvents usable as the organic solvent include methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, t-butyl alcohol or isobutyl alcohol. Examples of the alcohol solvent include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol, 1,4-butanediol, 1,2,4-butanetriol, 1,5-pentanediol, 1,2 , 6-hexanetriol, hexylene glycol, glycerol, glycerol ethoxylate or trimethylolpropane ethoxylate, the ketone solvent is acetone, methyl ethyl ketone, diethyl ketone or diacetone alcohol, the ester System solvents include methyl acetate, ethyl acetate or ethyl lactate. The monohydric alcohol solvent may improve the permeability, dot forming ability, and drying characteristics of a printed image on a recording medium such as plain paper or specialty paper by adjusting the surface tension of the ink, and the polyhydric alcohol solvent does not easily evaporate. By lowering the freezing point of the ink, it is possible to improve the storage stability of the ink to prevent clogging of the nozzle.

Examples of the nitrogen-based solvent include 2-pyrrolidone or N-methyl-2-pyrrolidone, and examples of the sulfur-containing solvent include dimethyl sulfoxide, tetramethylene sulfone or thioglycol.

When such an organic solvent is used together with an aqueous solvent such as water, the content of the organic solvent is, for example, about 0.1 to about 130 parts by weight, about 10 to about 50 parts by weight, and about 0.1 based on 100 parts by weight of water. If it is less than the weight part, the surface tension of the ink may be excessively increased, and if it exceeds about 130 parts by weight, the viscosity of the ink may increase and the ejection performance may be degraded.

The ink composition according to an embodiment of the present invention may include various additives to enhance its properties, and specifically, is selected from the group consisting of a wetting agent, a dispersing agent, a surfactant, a viscosity adjusting agent, a pH adjusting agent, and an antioxidant. It may further comprise one or more additives, the content of the additive is, for example, about 0.5 to about 600 parts by weight, about 10 to about 300 parts by weight based on 100 parts by weight of the colorant. If the content of the additive is less than about 0.5 parts by weight, it is difficult to express the performance, and if it is more than about 600 parts by weight, the storage stability may be lowered.

In particular, there is no restriction | limiting in particular as surfactant in the said additive, According to the objective, it can select suitably, For example, an amphoteric surfactant, anionic surfactant, cationic surfactant, nonionic surfactant, etc. are mentioned. These may be used individually by 1 type and may use 2 or more types together.

Examples of the amphoteric surfactant include alanine, dodecyldi (aminoethyl) glycine, di (octylaminoethyl) glycine, N-alkyl-N, N-dimethylammonium betaine and the like.

Examples of the anionic surfactants include alkylbenzene sulfonates, α-olefin sulfonates, polyoxyethylene alkyl ether acetate surfactants, and phosphate esters.

Examples of the cationic surfactant include amine salts such as alkylamine salts, aminoalcohol fatty acid derivatives, polyaminefatty acid derivatives, and imidazoline, alkyltrimethylammonium salts, dialkyldimethylammonium salts, alkyldimethylbenzylammonium salts, pyridinium salts, and alkyls. Quaternary ammonium salt type surfactants, such as an isoquinolinium salt and benzetonium chloride, etc. are mentioned.

As said nonionic surfactant, a polyoxyethylene alkyl ether surfactant, a polyoxyethylene alkyl phenyl ether surfactant, an acetylene glycol surfactant etc. are mentioned, for example.

Among these, nonionic surfactants are preferred because of their excellent defoaming performance.

Preferred nonionic surfactants include SURFYNOL series from Air Products, which has an acetylenic ethoxylated diol structure, TERGITOL series, and polyoxyethylene sorbitan fatty acid, which are manufactured by Union Carbide, which has a polyethylene oxide or polypropylene oxide structure. Tween series having an ester (polyoxyethylene sorbitan fatty acid ester) structure.

The ink composition according to the embodiment of the present invention has a surface tension at 25 ° C., for example, about 15 to about 70 dyne / cm, about 20 to about 50 dyne / cm, in order to exhibit an optimal use state. The viscosity at 25 ° C. is for example about 1 to about 15 cps, about 1.5 to about 10 cps. If it is out of the range of the surface tension printing performance is lowered, if it is out of the range of the viscosity may not be properly discharged.

The ink composition according to an embodiment of the present invention is used in two or more kinds of different compositions to constitute an ink set.

In this case, when two ink compositions are included in the ink set, the ink set includes one ink composition comprising about 90 to about 150 encapsulated colorants coated with a polymer resin having an expansion degree of about 10 to about 70%. It may include one ink composition comprising an encapsulating colorant coated with a polymer resin having a degree of expansion of%.

In addition, when two ink compositions are included in the ink set, the difference in the degree of expansion between the polymer resins of the encapsulating colorants included in the ink composition may be, for example, about 20 to about 140, about 20 to about 100%, and about 30 to about 80%. In this case, when the difference in swelling is less than about 20%, it is difficult to put a differentiation for each pigment ink. If the difference is greater than about 140%, crosslinking of one pigment ink hardly occurs, so that the effect of encapsulation may not be exhibited.

An ink set using two ink compositions containing encapsulated colorants coated with a polymer resin having such a different degree of expansion has an ink composition comprising an encapsulated colorant coated with a polymer resin having a high degree of expansion, that is, a high degree of crosslinking. An ink composition which prints silver characters and includes an encapsulation colorant coated with a polymer resin having a low degree of expansion, that is, a low crosslinking, can be used to print an image.

At this time, the encapsulation colorant coated with a polymer resin having a low degree of expansion has a very hard property, so that the spreadability in the paper is not good, so that the thickness after printing does not change, so that an excellent optical density can be realized. The encapsulating colorant coated with the polymer resin can be spread evenly on the paper evenly after printing because it is excellent in spreadability with respect to paper, so that the image can have excellent durability as well as printing gloss. And improved printing results respectively in the image.

Such an ink set may be provided in the ink containing portion or inkjet printer cartridge of the inkjet recording apparatus. An inkjet recording apparatus according to an embodiment of the present invention is a thermal head of a method of discharging ink droplets by steam pressure by heating the ink composition, and a piezo head of discharging ink droplets using a piezo element. ), A disposable head or a permanent head. In addition, the inkjet recording apparatus may be a scanning type printer or an array type printer, and may also be used for desktop, textile, and industrial use. The head type, printer type, and use associated with the ink jet recording apparatus according to the embodiment of the present invention are merely listed to describe the ink jet recording apparatus in more detail, and are not limited to the above-described ink jet recording apparatus. Can be.

1 is a view showing an inkjet recording apparatus according to an embodiment of the present invention.

Referring to this, the inkjet recording apparatus includes an inkjet printer cartridge containing an ink composition according to an embodiment of the present invention. The printer cover 8 is connected with the main body 13 of the printer 5. The interlocked regions of the movable latch 10 protrude through the holes 7. The movable latch 10 is engaged with the fixing latch 9, and the fixing latch 9 is connected to the inside of the printer cover when the cover is closed. The cover has a recess 14 corresponding to the engaged area of the movable latch 10 extending through the hole. The inkjet printer cartridge 11 is mounted to position the ink on the paper 3 passing through the lower portion of the inkjet printer cartridge 11.

2 is a cross-sectional view of an inkjet printer cartridge including an ink set according to an embodiment of the present invention. The inkjet printer cartridge 100 includes a cartridge body 110 forming the ink reservoir 112, an inner cover 114 covering the top region of the ink reservoir 112, and the inner cover 114. And an outer cover 116 spaced apart from each other and sealing the ink reservoir 112 and the inner cover 114.

The ink reservoir 112 is divided into a first chamber 124 and a second chamber 126 by a vertical barrier wall 123. An ink passage 128 is formed at the bottom of the vertical barrier wall 123 between the first chamber 124 and the second chamber 126. Ink fills the first chamber 124 and sponge 129, and ink fills the second chamber 126. The inner cover 114 is formed in the vent hole 126a corresponding to the second chamber 126.

The filter 14 is formed in the lower portion of the second chamber 126 to filter impurities and fine bubbles in the ink to prevent the ejection hole of the print head 13 from being glogged. The hook 142 is formed on an edge (edge region) of the filter 140 and disposed (coupled) in the top region of the standpipe 132. The ink of the ink reservoir 120 passes through the discharge hole of the printer head 130 and is discharged in a droplet form to the printing medium.

Hereinafter, one embodiment of the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Preparation of Encapsulated Colorant Coated with Crosslinked Polymer Resin

Example 1-1-1

Distilled water (1,360g), carbon black (Cabot, cabojet-300) (384.8g), sodium hydroxide (7g), disodium didodecyldiphenyloxide disulfonate (DPOS) 45, manufactured by CYTEC, USA, 9 g), vinyl alcohol monomer (20 g), styrene monomer (120 g) and t-dodecyl mercaptan (3.2 g) were added, followed by nitrogen substitution with stirring at 250 rpm. Glutalaldehyde (2 g) was then added to the reactor followed by nitrogen to raise the reactor pressure to 2 kg / cm 2. After stirring for 30 minutes, all the inputs were sufficiently mixed, and the temperature of the reactor was raised to 70 ° C. and stirred for 300 minutes to prepare an encapsulated colorant. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 140%.

Example 1-1-2

An encapsulated colorant was prepared in the same manner as in Example 1-1-1 except that glutaraldehyde (5 g) was used. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 98%.

Example 1-1-3

An encapsulating colorant was prepared in the same manner as in Example 1-1-1 except that glutaraldehyde (10 g) was used. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 74%.

Examples 1-2 -1

A (meth) acrylic ester monomer (200 g) was used instead of the vinyl alcohol monomer (20 g) and the styrene monomer (120 g) as the polymerizable monomer, and epichlorohydrin (2 g) was used instead of the glutaraldehyde (2 g) as the crosslinking agent. An encapsulating colorant was prepared in the same manner as in Example 1-1-1 except for the point. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 145%.

Example 1-2-2

A (meth) acrylic ester monomer (200 g) was used instead of the vinyl alcohol monomer (20 g) and the styrene monomer (120 g) as the polymerizable monomer, and epichlorohydrin (5 g) was used instead of the glutaraldehyde (2 g) as the crosslinking agent. An encapsulating colorant was prepared in the same manner as in Example 1-1-1 except for the point. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 96%.

Example 1-2-3

A (meth) acrylic ester monomer (200 g) was used instead of the vinyl alcohol monomer (20 g) and the styrene monomer (120 g) as the polymerizable monomer, and epichlorohydrin (10 g) was used instead of the glutaraldehyde (2 g) as the crosslinking agent. An encapsulated colorant was prepared in the same manner as in Example 1-1-1 except for the point. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 76%.

Example 1-3-1

N-dimethylmaleimide monomer (200 g) is used instead of vinyl alcohol monomer (20 g) and styrene monomer (120 g) as the polymerizable monomer, and 1-ethyl-3- (3- is used instead of glutaraldehyde (2 g) as a crosslinking agent. An encapsulating colorant was prepared in the same manner as in Example 1-1-1 except that dimethylaminopropylcarbodiim) (2 g) was used. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 132%.

Example 1-3-2

N-dimethylmaleimide monomer (200 g) is used instead of vinyl alcohol monomer (20 g) and styrene monomer (120 g) as the polymerizable monomer, and 1-ethyl-3- (3- is used instead of glutaraldehyde (2 g) as a crosslinking agent. An encapsulating colorant was prepared in the same manner as in Example 1-1-1 except that dimethylaminopropylcarbodiim) (5 g) was used. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 63%.

Example 1-3-3

N-dimethylmaleimide monomer (200 g) is used instead of vinyl alcohol monomer (20 g) and styrene monomer (120 g) as the polymerizable monomer, and 1-ethyl-3- (3- is used instead of glutaraldehyde (2 g) as a crosslinking agent. An encapsulating colorant was prepared in the same manner as in Example 1-1-1 except that dimethylaminopropylcarbodiim) (10 g) was used. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 36%.

<Preparation of Encapsulation Colorant Coated with Polymer Resin Without Crosslinking Structure>

Comparative Example 1-1-1

An encapsulated colorant was prepared in the same manner as in Example 1-1-1 except that glutaraldehyde (2 g) was not used. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 168%.

Comparative Example 1-1-2

An encapsulating colorant was prepared in the same manner as in Example 1-1-1 except that glutaraldehyde (1 g) was used. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 153%.

Comparative Example 1-1-3

An encapsulated colorant was prepared in the same manner as in Example 1-1-1 except that glutaraldehyde (30 g) was used. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 9.2%.

Comparative Example 1-2-1

An encapsulating colorant was prepared in the same manner as in Example 1-2-1 except that epichlorohydrin (2 g) was not used. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 157%.

Comparative Example 1-2-2

An encapsulating colorant was prepared in the same manner as in Example 1-2-1 except for using epichlorohydrin (1 g). The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 151%.

Comparative Example 1-2-3

An encapsulating colorant was prepared in the same manner as in Example 1-2-1 except for using epichlorohydrin (35 g). The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 8.5%.

Comparative Example 1-3-1

An encapsulating colorant was prepared in the same manner as in Example 1-3-1 except that 1-ethyl-3- (3-dimethylaminopropylcarbodiimide) (2 g) was not used. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 173%.

Comparative Example 1-3-2

An encapsulating colorant was prepared in the same manner as in Example 1-3-1 except that 1-ethyl-3- (3-dimethylaminopropylcarbodiimide) (1 g) was used. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 158%.

Comparative Example 1-3-3

An encapsulating colorant was prepared in the same manner as in Example 1-3-1 except that 1-ethyl-3- (3-dimethylaminopropylcarbodiimide) (45 g) was used. The degree of expansion of the polymer resin coated on the prepared encapsulating colorant was 8.3%.

<Production of Ink Composition>

After mixing the encapsulating colorant, water, organic solvent and additives prepared in Examples 1-1-1 to 1-3-3 and Comparative Examples 1-1-1 to 1-3-3 with the following composition, After stirring for 30 minutes or more in the stirrer to make a uniform state. Thereafter, the mixture was passed through a filter of 0.45 mu m to prepare Examples 2-1-1 to 2-3-3 and Comparative Examples 2-1-1 to 2-3-3 ink compositions.

The ink compositions of Comparative Examples 3 to 5 were prepared in the same manner as above except that a conventional colorant was used instead of an encapsulating colorant.

Example 2-1-1

4.5 parts by weight of the encapsulating colorant prepared in Example 1-1-1

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of glycerol propoxylate

4 parts by weight of 1,3-dimethyl-3,4,5,6-tetrahydro-pyrimidinone

Example 2-1-2

4.5 parts by weight of the encapsulating colorant prepared in Example 1-1-2

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of glycerol propoxylate

4 parts by weight of 1,3-dimethyl-3,4,5,6-tetrahydro-pyrimidinone

Example 2-1-3

4.5 parts by weight of the encapsulating colorant prepared in Example 1-1-3

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of glycerol propoxylate

4 parts by weight of 1,3-dimethyl-3,4,5,6-tetrahydro-pyrimidinone

Example 2-2-1

4.5 parts by weight of the encapsulating colorant prepared in Example 1-2-1

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of glycerol propoxylate

4 parts by weight of 1,3-dimethyl-3,4,5,6-tetrahydro-pyrimidinone

Example 2-2-2

4.5 parts by weight of the encapsulating colorant prepared in Example 1-2-2

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of glycerol propoxylate

4 parts by weight of 1,3-dimethyl-3,4,5,6-tetrahydro-pyrimidinone

Example 2-2-3

4.5 parts by weight of the encapsulating colorant prepared in Example 1-2-3

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of glycerol propoxylate

4 parts by weight of 1,3-dimethyl-3,4,5,6-tetrahydro-pyrimidinone

Example 2-3-1

4.5 parts by weight of the encapsulating colorant prepared in Example 1-3-1

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of glycerol propoxylate

4 parts by weight of 1,3-dimethyl-2-imidazolidinone

Example 2-3-2

4.5 parts by weight of the encapsulating colorant prepared in Example 1-3-2

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of glycerol propoxylate

4 parts by weight of 1,3-dimethyl-2-imidazolidinone

Example 2-3-3

4.5 parts by weight of the encapsulating colorant prepared in Example 1-3-3

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of glycerol propoxylate

4 parts by weight of 1,3-dimethyl-2-imidazolidinone

Comparative Example 2-1-1

4.5 parts by weight of the encapsulating colorant prepared in Comparative Example 1-1-1

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of glycerol propoxylate

4 parts by weight of 1,3-dimethyl-3,4,5,6-tetrahydro-pyrimidinone

Comparative Example 2-1-2

4.5 parts by weight of the encapsulating colorant prepared in Comparative Example 1-1-2

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of glycerol propoxylate

4 parts by weight of 1,3-dimethyl-3,4,5,6-tetrahydro-pyrimidinone

Comparative Example 2-1-3

4.5 parts by weight of the encapsulating colorant prepared in Comparative Example 1-1-3

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of glycerol propoxylate

4 parts by weight of 1,3-dimethyl-3,4,5,6-tetrahydro-pyrimidinone

Comparative Example 2-2-1

4.5 parts by weight of encapsulated colorant prepared in Comparative Example 1-2-1

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of trimethylolpropane propoxylate

4 parts by weight of 1,3-dimethyl-3,4,5,6-tetrahydro-pyrimidinone

Comparative Example 2-2-2

4.5 parts by weight of encapsulated colorant prepared in Comparative Example 1-2-2

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of trimethylolpropane propoxylate

4 parts by weight of 1,3-dimethyl-3,4,5,6-tetrahydro-pyrimidinone

Comparative Example 2-2-3

4.5 parts by weight of the encapsulating colorant prepared in Comparative Example 1-2-3

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

4 parts by weight of trimethylolpropane propoxylate

4 parts by weight of 1,3-dimethyl-3,4,5,6-tetrahydro-pyrimidinone

Comparative Example 2-3-1

4.5 parts by weight of encapsulated colorant prepared in Comparative Example 1-3-1

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

Pentaerythritol propoxylate 4 parts by weight

4 parts by weight of 1,3-dimethyl-2-imidazolidinone

Comparative Example 2-3-2

4.5 parts by weight of the encapsulating colorant prepared in Comparative Example 1-3-2

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

Pentaerythritol propoxylate 4 parts by weight

4 parts by weight of 1,3-dimethyl-2-imidazolidinone

Comparative Example 2-3-3

4.5 parts by weight of the encapsulating colorant prepared in Comparative Example 1-3-3

Glycerol 7.5 parts by weight

8 parts by weight of diethylene glycol

72 parts by weight of water (deionized water)

Pentaerythritol propoxylate 4 parts by weight

4 parts by weight of 1,3-dimethyl-2-imidazolidinone

Comparative Example 3

4.5 parts by weight of Raven 5250 (manufactured by Columbia co.)

Glycerol 7.5 parts by weight

Diethylene glycol 8.0 parts by weight

80.0 parts by weight of water (deionized water)

Comparative Example 4

Regal 330 (manufactured by Cabot co.) 4.0 parts by weight

Glycerol 7.5 parts by weight

Diethylene glycol 8.0 parts by weight

80.0 parts by weight of water (deionized water)

Comparative Example 5

NB (clariant production) 4.5 parts by weight

Glycerol 7.5 parts by weight

Diethylene glycol 8.0 parts by weight

80.0 parts by weight of water (deionized water)

Experimental Example 1. Optical Concentration (OD) Test

The ink compositions obtained in Examples 2-1-1 to 2-3-3, Comparative Examples 2-1-1 to 2-3-3, and Comparative Examples 3 to 5 are refilled in the ink cartridge M-50 (manufactured by Samsung). After printing a stick figure (2 × 10 cm) on a printer (MJC-3300p, manufactured by Samsung) and drying it for 24 hours, image OD was evaluated using an OD tester (GretagMacdeth, SpectorEye) as follows. It is shown in Table 1 below.

A = OD of image

◎: A ≥ 1.4

O: 1.2≤ A <1.4

△: 1.0≤ A <1.2

X: A <1.0

Experimental Example 2. Wear Resistance Test

The ink compositions obtained in Examples 2-1-1 to 2-3-3, Comparative Examples 2-1-1 to 2-3-3, and Comparative Examples 3 to 5 are refilled in the ink cartridge M-50 (manufactured by Samsung). After printing a stick figure (2 × 10 cm) on a printer (MJC-3300p, manufactured by Samsung), drying it for 24 hours, and then rubbing it five times using a tester, before rubbing the OD of the image transferred from the stick figure. Compared with the image OD of the figure, expressed as a percentage and evaluated as follows. The results are shown in Table 1 below.

A = (OD of source image of transition image / OD of stick figure) × 100 (%)

◎: A <15

O: 15≤ A <30

△: 30≤ A ≤ 45

X: A> 45

Experimental Example 3: Waterfastness test

The ink compositions obtained in Examples 2-1-1 to 2-3-3, Comparative Examples 2-1-1 to 2-3-3, and Comparative Examples 3 to 5 are refilled in the ink cartridge M-50 (manufactured by Samsung). After printing a stick figure (2 × 10 cm) on a printer (MJC-2400C, Samsung), drop 5 drops of water after 5 minutes and dry it for 24 hours, and then the water flows down to reduce the OD. Compared with the percentage and evaluated as follows, the results are shown in Table 1 below.

A = (Image after water flows OD / OD of circle bar drawing) × 100 (%)

◎: 95 ≤ A

O: 90 ≤ A <95,

△: 85 ≤ A <90

X: A <85

Experimental Example 4: Printed gloss test

The ink compositions obtained in Examples 2-1-1 to 2-3-3, Comparative Examples 2-1-1 to 2-3-3, and Comparative Examples 3 to 5 are refilled in the ink cartridge M-50 (manufactured by Samsung). After printing a stick figure (2 × 10 cm) in a printer (MJC-2400C, manufactured by Samsung) and after 120 minutes, measured the gloss of printing with a glossmeter (glossmeter) and evaluated the results as shown in Table 1 below.

◎: 40 ≤ A

O: 35≤A <40

△: 30 ≤ A <35

X: A <30

Encapsulation Crosslinking Inflated degree (%) Optical density Wear resistance Water resistance Printing gloss Example 2-1-1 ○ ○ 140 ◎ ○ ○ ◎ Example 2-1-2 ○ ○ 98 ◎ ◎ ◎ ○ Example 2-1-3 ○ ○ 74 ◎ ◎ ◎ ○ Example 2-2-1 ○ ○ 145 ○ △ ○ ◎ Example 2-2-2 ○ ○ 96 ○ ◎ ◎ ○ Example 2-2-3 ○ ○ 76 ○ ◎ ◎ ○ Example 2-3-1 ○ ○ 132 ○ ○ ○ ◎ Example 2-3-2 ○ ○ 63 ○ ◎ ◎ ◎ Example 2-3-3 ○ ○ 36 ○ ◎ ◎ ○ Comparative Example 2-1-1 ○ X 168 △ X ○ ◎ Comparative Example 2-1-2 ○ ○ 153 △ X ○ ◎ Comparative Example 2-1-3 ○ ○ 9.2 △ X ○ △ Comparative Example 2-2-1 ○ X 157 △ △ ○ ◎ Comparative Example 2-2-2 ○ ○ 151 △ △ ○ ◎ Comparative Example 2-2-3 ○ ○ 8.5 △ △ ○ △ Comparative Example 2-3-1 ○ X 173 X X △ ◎ Comparative Example 2-3-2 ○ ○ 158 X △ △ ○ Comparative Example 2-3-3 ○ ○ 8.3 △ △ △ △ Comparative Example 3 X X 0 △ X ○ △ Comparative Example 4 X X 0 △ △ ○ △ Comparative Example 5 X X 0 X X X X

Referring to Table 1, Examples 2-1-1 to 2-3-3 are compared with Comparative Examples 2-1-1 to 2-3-3, and Comparative Examples 3 to 5, and are abrasion resistance, water resistance, printing gloss. And it can be seen that the excellent results in both optical density. In particular, in Examples 2-1-1 to 2-3-3 using encapsulating colorants having an appropriate range of expansion degree due to the crosslinking structure, the thickness change after printing was small and the optical density was excellent. However, in Comparative Examples 2-1 to 2-3 and Comparative Examples 3 to 5, the expansion degree was so large that the thickness change after printing was remarkably large, or the crosslinked structure was too dense, resulting in too small a colorant to print. The optical density decreases due to problems such as absorption into the paper.

According to an embodiment of the present invention, in the encapsulation colorant coating the surface of the colorant with a polymer resin having a crosslinked structure by adjusting the degree of expansion of the polymer resin, the ink containing an encapsulation colorant coated with a low-expansion polymer resin The composition prints letters, and the ink composition comprising an encapsulating colorant coated with a highly expandable polymer resin is used to print an image, so that the water resistance, light resistance, abrasion resistance, and optical density are good. In addition, printing gloss can be realized at the same time excellent image.

1 is a perspective view of an inkjet recording apparatus having an ink cartridge according to an embodiment of the present invention.

2 is a cross-sectional view of an ink cartridge according to an embodiment of the present invention.

<Brief description of the major symbols in the drawings>

3... Paper 5... printer

7... Hall 8.. Printer cover

9... Securing latch 10.. Mobility latch

11... Ink cartridge 13... The main body of the printer

14... Recess

100... Cartridge 112.. Ink bottle

114... Inner cover 116... Outer cover

123... Vertical barrier 124... First chamber

126... Second chamber 126a... Vent Hall

128... Ink bottle 130... Nozzle of print head

132... Standpipe 140... filter

142... hook

Claims (18)

coloring agent; And a polymeric resin coating said colorant, wherein said polymeric resin is crosslinked so that said polymeric resin has an degree of expansion of about 10 to about 150%. The method of claim 1, Encapsulating colorant, characterized in that the polymer resin is prepared by polymerizing a composition comprising a polymerizable unsaturated monomer, a crosslinking agent and a polymerization initiator. The method of claim 2, The polymerizable unsaturated monomers are unsaturated carboxylic acids, vinyl cyanide monomers, unsaturated carboxylic acid alkyl esters, unsaturated carboxylic hydroxyalkyl esters, unsaturated carboxylic acid amides and derivatives, aromatic vinyl monomers methyl vinyl ketones, and vinylidene chloride Encapsulating colorant, characterized in that at least one selected from the group consisting of. The method of claim 2, The encapsulating colorant, wherein the crosslinking agent is selected from the group consisting of aldehyde crosslinking agent, epoxy crosslinking agent, and carbodiimide crosslinking agent. Emulsifying the polymerizing composition comprising a polymerizable unsaturated monomer, an aqueous medium, a colorant, a crosslinking agent, an emulsifier and a polymerization initiator; And Polymerizing the polymerizable unsaturated monomer and the crosslinking agent on the colorant to form a polymer resin covering the colorant, A method of making a crosslinked encapsulating colorant such that said polymeric resin has an swelling degree of about 10 to about 150%. The method of claim 5, The polymerization composition is about 500 parts by weight to about 5,000 parts by weight, about 0.1 to about 20 parts by weight of colorant, about 1 to about 20 parts by weight of crosslinking agent, and about 0.01 to about 10 parts by weight of emulsifier based on 100 parts by weight of polymerizable unsaturated monomer. , And from about 0.05 to about 3 parts by weight of the polymerization initiator. The method of claim 5, By adjusting the content of the crosslinking agent, a method for producing an encapsulating colorant, characterized in that to adjust the degree of expansion of the polymer resin. The method of claim 5, The crosslinking agent is selected from the group consisting of an aldehyde crosslinking agent, an epoxy crosslinking agent, and a carbodiimide crosslinking agent. An ink composition comprising the encapsulating colorant according to any one of claims 1 to 4 and a solvent. The method of claim 9, An ink composition comprising about 1 to about 20 parts by weight of the encapsulating colorant and about 80 to about 99 parts by weight of the solvent, based on 100 parts by weight of the ink composition. The method of claim 9, The solvent is water; Or one or more organic solvents selected from the group consisting of monohydric alcohol solvents, polyhydric alcohol solvents, ketone solvents, ester solvents, nitrogen-containing solvents, and sulfur-containing solvents. The method of claim 9, Wherein the ink composition has a surface tension of about 15 to about 70 dyne / cm at 25 ° C. and a viscosity of about 1 to about 15 cps. An ink set comprising at least two ink compositions comprising the encapsulating colorant according to any one of claims 1 to 4. The method of claim 13, One ink composition comprising an encapsulating colorant coated with a polymeric resin having a degree of expansion of about 10 to about 70%; And an ink composition comprising an encapsulation colorant coated with a polymer resin having an degree of expansion of about 90 to about 150%. The method of claim 13, And two ink compositions included in the ink set, and a difference in swelling degree between the polymer resins covering the encapsulating colorants included in the ink composition, respectively, from about 20 to about 140%. A cartridge for an ink jet recording apparatus, comprising the ink set according to claim 13. An inkjet recording apparatus comprising the cartridge for an inkjet recording apparatus according to claim 16. menstruum; An encapsulation colorant comprising a polymer resin having a crosslinked structure, wherein the encapsulation colorant has a plurality of printing gloss and optical density according to the degree of expansion of the crosslinked polymer resin.

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