JP5747951B2 - Ink set for ink jet recording, ink jet recording method, recorded matter - Google Patents

Description

  The present invention relates to a yellow ink composition used in an ink jet recording method, an ink jet ink set including the yellow ink composition, an ink jet recording method, and a recorded matter.

  In recent years, ink jet recording methods have attracted attention. The ink jet recording method is a printing method in which printing is performed by causing an ink composition to fly as small droplets and attaching the droplets to a recording medium (media) such as paper. This method has a feature that a high-resolution and high-quality image can be printed at a high speed by a relatively inexpensive apparatus. Ink jet recording apparatuses using this method are widely accepted in the market due to excellent print quality, low cost, relatively quiet operation, and excellent graphic forming ability. Among them, thermal (Bubble Jet®) and piezoelectric drop-on-demand printers have been particularly successful commercially and have been widely used as printers for personal computers in offices and homes.

  In recent years, it has been practiced to form a color image by an ink jet recording method using a plurality of color ink compositions to obtain a recorded matter. In general, a color image is formed by three colors, ie, a yellow ink composition, a magenta ink composition, and a cyan ink composition, and further, if desired, four colors including a black ink composition. There are also cases where color images are formed by six colors obtained by adding a light cyan ink composition and a light magenta ink composition to these four colors, or seven colors obtained by further adding a dark yellow ink composition to them. A combination of two or more ink compositions is an ink set.

  In the ink composition used for forming the color image described above, the ink composition for each color itself has a good color developability, and a good intermediate color when a plurality of color ink compositions are combined. And the like, and the recorded material obtained should not discolor during storage.

  More recently, in “photo quality” printing by color inkjet printers, the head, ink composition, recording method, and media have been continuously improved, and the resulting image quality is comparable to “silver salt photography”. , "Like photo". On the other hand, improvement in the ink composition and the media has improved the storability of the image of the recorded matter obtained using the color ink jet printer, and in particular, the light resistance of the image is a level at which there is no practical problem. Has been improved.

  However, image degradation is caused not only by the action of light but also by oxidation with an oxidizing gas present in the environment, such as ozone, or moisture (humidity) in the environment, and the fading or discoloration of the image proceeds. . Therefore, in order to further improve the storability of the image of the recorded matter, it is desired to improve the light resistance of the image formed by the ink composition as well as to improve the ozone resistance and the moisture resistance. . For this reason, various studies for improving the light resistance, ozone resistance and moisture resistance of ink-jet recorded materials have been conducted (for example, see Patent Document 1).

JP-A-2005-15813

  In an ink set, when each of the light resistance of a specific ink composition is significantly lower than the light resistance of the other ink composition, the color formed by the specific ink composition fades faster than other colors and Discoloration and the like, and the balance of the color tone of the entire image becomes worse. Then, the observer can recognize the image quality deterioration of the image within a shorter time than the observer can recognize that the image formed by the single ink composition fades. Therefore, in the ink set, in addition to improving the light fastness of each ink composition constituting the ink set, the level of the light fastness of each ink composition, that is, the image formed by each ink composition. It is preferable that the deterioration rate due to light, ozone and water, for example, the fading rate is the same as much as possible. In other words, it is preferable that each ink composition constituting the ink set is excellent in light resistance and the like, and each difference in light resistance between the ink compositions is small.

  Considering the use of pigments as colorants for ink jet recording inks, pigments are superior in light resistance and water resistance compared to dyes, but the types of usable colorants are fewer than dyes. When actually used as an ink for ink jet recording, it is necessary to sufficiently study the balance between light resistance and color development. Further, when used as an ink set, the light resistance and color developability between the ink compositions constituting the ink set, in addition to improving the light fastness and color developability of each ink composition constituting the ink set. It is also necessary to consider the balance.

  Accordingly, an object of the present invention is to provide a yellow ink composition that is comprehensively excellent in terms of light resistance, color developability, and storage stability. Also provided are an ink set having an excellent balance of light resistance and color developability between the ink compositions constituting the ink set, an ink jet recording method using the ink set, and a recorded matter recorded by the ink jet recording method. That is the purpose.

  The inventors of the present invention have recently found that a yellow ink composition containing a specific pigment can realize a good image in a color ink jet recording method. Furthermore, it has been found that an image having a good color balance can be obtained by using this yellow ink composition in combination with a specific color ink composition. The present invention is based on such knowledge, and C.I. I. The present invention provides a yellow ink composition for ink-jet recording, comprising one or more pigments selected from the group consisting of CI Pigment Yellow 213, 185, and 155.

  The present invention also provides an ink set for inkjet recording comprising a yellow ink composition, a cyan ink composition, a magenta ink composition, and a black ink composition, wherein the yellow ink composition is the yellow ink composition. An inkjet ink set is provided, wherein the cyan ink composition contains a phthalocyanine pigment, the magenta ink composition contains a quinacridone pigment, and the black ink composition contains carbon black.

  Furthermore, the present invention relates to an inkjet recording method for performing printing by ejecting droplets of an ink composition and attaching the droplets to a recording medium, wherein the yellow ink composition or the ink is used as the ink composition. An inkjet recording method using a set is provided.

  Furthermore, the present invention provides a recorded matter printed by the ink jet recording method.

  According to the yellow ink composition of the present invention, light resistance, color developability, and storage stability can be comprehensively improved. Therefore, an ink jet ink set, an ink jet recording method and a recorded matter provided with the yellow ink composition are excellent in fading balance with a color ink composition other than the yellow ink composition, and improve image deterioration due to secular change. be able to.

[Ink composition]
The yellow ink composition for inkjet recording of the present invention contains C.I. I. And one or more pigments selected from the group consisting of CI Pigment Yellow 213, 185, and 155.

(Coloring agent)
As a colorant, C.I. I. A yellow ink composition containing one or more pigments selected from the group consisting of CI Pigment Yellow 213, 185, and 155 (hereinafter simply referred to as “yellow ink composition”) has light resistance, color developability, and storage stability. Overall, it will be excellent. Therefore, it is suitable as an ink for inkjet recording.

  According to the embodiment of the present invention, the content of the pigment contained in the yellow ink composition may be appropriately determined, but is preferably 0.5 to 15% by weight, and preferably 1 to 10% by weight. More preferably, it is 2 to 8% by weight.

  The average particle size of the pigment is preferably 1 to 300 nm from the viewpoint of improving color development.

(Dispersant)
The yellow ink composition of this embodiment preferably contains a dispersant in order to stabilize pigment dispersion. As the dispersant, a water-soluble polymer or various surfactants described later are used.

  As the water-soluble polymer, a water-soluble polymer having an ionic hydrophilic group such as an alkali metal salt such as a sulfonic acid group, a carboxylic acid group, or an amino group, an ammonium salt, an inorganic acid salt, or an organic acid salt is used. These can be used alone or in admixture of two or more.

  Specifically, carboxymethyl cellulose salts, cellulose derivatives such as viscose, natural polymers such as alginate, gelatin, albumin, casein, gum arabic, tongant gum, lignin sulfonate, cationic starch, phosphate starch, carboxymethyl starch salt Starch derivatives such as polyacrylate, polyvinyl sulfate, poly (4-vinylpyridine) salt, polyamide, polyallylamine salt, condensed naphthalene sulfonate, styrene-acrylate copolymer, styrene-methacrylate Polymer, acrylate-acrylate copolymer, acrylate-methacrylate copolymer, methacrylate-acrylate copolymer, methacrylate-methacrylate copolymer, styrene-itacon Acid salt , Synthetic polymers such as itaconic acid ester-itaconate copolymer, vinyl naphthalene-acrylate copolymer, vinyl naphthalene-methacrylate copolymer, vinyl naphthalene-itaconate copolymer, etc. is there. Among these, an ammonium salt of a styrene-acrylic acid copolymer can be preferably used.

  These water-soluble polymers preferably have a weight average molecular weight in the range of 2,000 to 1,000,000. If the weight average molecular weight is 2,000 or more, the scratch resistance of the image can be improved. If it is 1,000,000 or less, it is easy to make the ink viscosity within a range that can be ejected in the ink jet system.

  When a water-soluble polymer is used, it is preferably added in the range of 0.01 to 20% by weight with respect to the total amount of ink. If it is 0.01% by weight or more, the scratch resistance of the image can be improved. If it is 20% by weight or less, the ink viscosity tends to be within a range that can be ejected in the ink jet system.

  Moreover, as a dispersing agent, a commercially available thing can be used, As the specific example, Johnson polymer Co., Ltd. product, Jonkrill 61J (molecular weight 10000, acid value 195), Jonkrill 68 (molecular weight 10000, acid value) 195), Joncryl 450 (molecular weight 10,000 to 20000, acid value 100), Joncryl 55 (molecular weight 7500, acid value 200), Joncryl 555 (molecular weight 5000, acid value 200), Joncryl 586 (molecular weight 3100, acid value). 105), Joncryl 680 (molecular weight 3900, acid value 215), Joncryl 682 (molecular weight 1600, acid value 235), Joncryl 683 (molecular weight 7300, acid value 150), B-36 (molecular weight 6800, acid value 250) Etc. In addition, molecular weight shows a weight average molecular weight.

  In the ink, the dispersant is preferably contained in an amount of 0.1 to 10% by weight, more preferably 0.3 to 6% by weight, in terms of solid content, with respect to the pigment.

  Further, in the yellow ink composition of the present embodiment, a so-called surface-treated pigment (self-dispersed pigment) in which a dispersibility-imparting group is chemically introduced directly on the pigment particle surface is used instead of the above-described pigment and dispersant. You can also.

(Penetration enhancer)
The yellow ink composition of the present embodiment preferably contains a penetration enhancer because it improves the wettability of the organic pigment by increasing the wettability to the recording medium. Examples of the penetration enhancer include various surfactants such as a cationic surfactant, an anionic surfactant and a nonionic surfactant; alcohols such as methanol, ethanol and isopropyl alcohol; ethylene glycol monomethyl ether and diethylene glycol mono Lower alkyl ethers of polyhydric alcohols such as ethyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, prolene glycol monobutyl ether, prolene glycol monobutyl ether; 1 such as 1,2-pentanediol, 1,2-hexanediol, etc. , 2-alkanediol, and one or more of these are used. In particular, it is preferable to use 1,2-alkanediol.

  The penetration enhancer is preferably about 0.1 to 20% by weight, more preferably about 3 to 15% by weight in the yellow ink composition.

  Other preferred examples of the penetrant include polyether-modified organosiloxane compounds represented by the following general formula (1).

（式中、Ｒ¹〜Ｒ⁷は、それぞれ独立して、Ｃ_1-6アルキル基であり、ｊ、ｋ及びｇは、それぞれ独立して、１以上の整数であり、ＥＯはエチレンオキシ基であり、ＰＯはプロピレンオキシ基であり、ｐ及びｑは０以上の整数であるが、但しｐ＋ｑは１以上の整数であり、ＥＯ及びＰＯは、［ ］内においてその順序は問わず、ランダムであってもブロックであってもよい）

Wherein R ^{1 to} R ⁷ are each independently a C _1-6 alkyl group, j, k and g are each independently an integer of 1 or more, and EO is an ethyleneoxy group Yes, PO is a propyleneoxy group, p and q are integers of 0 or more, provided that p + q is an integer of 1 or more, and EO and PO are random in [] regardless of their order. Or block)

  Examples of the 1,2-alkanediol include those having 4 to 6 carbon atoms, such as 1,2-butanediol, 1,2-pentanediol, or 1,2-hexanediol. , 2-pentanediol and 1,2-hexanediol, more preferably 1,2-hexanediol. These can be used alone or in combination of two or more.

  The amount of 1,2-alkanediol added is preferably in the range of about 0.1 to 20% by weight, more preferably about 3 to 15% by weight, still more preferably about 5 to 10% by weight with respect to the ink composition. is there.

As the polyether-modified organosiloxane compound represented by the above general formula (1), preferably, R ¹ to R ⁷ is independently an alkyl group having 1 to 6 carbon atoms, preferably a methyl group. j, k, and g are each independently an integer of 1 or more, and more preferably 1 or 2. P and q are integers of 0 or more, provided that p + q is an integer of 1 or more.

As the polyether-modified organosiloxane compound represented by the general formula (1), more preferably, for example, a compound satisfying j = k + 1, R ^{1 to} R ⁷ are all methyl groups, and j is 2. Yes, k is 1, g is 1, p is an integer of 1 or more, and q is 0.

  The compounds represented by the above general formula (1) are commercially available and can be used. For example, commercially available silicon surfactants BYK-345, BYK-346, BYK-347, or BYK-348 are available from Big Chemie Japan.

  The addition amount of the polyether-modified organosiloxane compound may be appropriately determined, but is preferably in the range of about 0.01 to 5% by weight, more preferably about 0.1 to 1% by weight, and more preferably about 0.1 to 1% by weight. Preferably, it is about 0.3 to 0.5% by weight.

  Other preferable examples of the penetrant include polyhydric alcohol lower alkyl ethers (glycol ethers) and / or acetylene glycol surfactants represented by the following general formula (2).

（式中、０≦ｍ＋ｎ≦３０であり、Ｒ⁸〜Ｒ¹¹は、それぞれ独立してＣ_1-6アルキル基である）

(In the formula, 0 ≦ m + n ≦ 30, and R ^{8 to} R ¹¹ are each independently a C _1-6 alkyl group)

  The addition amount of the polyhydric alcohol lower alkyl ether is preferably 1 to 30% by weight, more preferably 5 to 20% by weight.

  Commercially available products may be used as the acetylene glycol surfactant represented by the general formula (2), and specific examples thereof include Surfynol 104, 82, 465, 485 or TG (both Air Product and Chemicals Inc.), Olfin STG, Olphine E1010 (manufactured by Nissin Chemical Co., Ltd. (trade name)).

  The addition amount of the acetylene glycol surfactant may be appropriately determined, but is preferably 0.01 to 5% by weight, more preferably 0.1 to 1% by weight with respect to the ink composition. .

(Wetting agent)
The yellow ink composition of this embodiment preferably contains a wetting agent from the viewpoint of preventing clogging of the nozzles of the inkjet printer. Examples of the wetting agent include glycerin, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polyethylene glycol having a molecular weight of 2000 or less, 1,3-propylene glycol, and isopropylene glycol. And polyhydric alcohols such as isobutylene glycol, 1,4-butanediol, 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, mesoerythritol, and pentaerythritol, preferably glycerin. is there.

  The addition amount of the wetting agent may be appropriately determined, but is preferably about 1 to 30% by weight with respect to the ink composition.

(water)
The yellow ink composition of this embodiment contains water as a balance. It is preferable to use pure water or ultrapure water such as ion exchange water, ultrafiltration water, reverse osmosis water, or distilled water. In particular, water obtained by sterilizing these waters by ultraviolet irradiation or addition of hydrogen peroxide is preferable because generation of mold and bacteria is prevented over a long period of time.

(Other ingredients)
Furthermore, the yellow ink composition of the present embodiment includes a pH adjuster such as triethanolamine or alkali metal hydroxide, a water-soluble polymer such as sodium alginate, a water-soluble resin, a fluorosurfactant, a preservative, A material selected from mold agents, rust inhibitors, dissolution aids, antioxidants, ultraviolet absorbers, and the like can be added as desired. These components can be used alone or in combination of two or more. Moreover, it is not necessary to add, if it is not necessary to add. Those skilled in the art can use the preferable additive selected in a preferable amount as long as the effects of the present invention are not impaired. The dissolution aid is an additive for dissolving the insoluble matter and keeping the ink composition in a uniform solution when the insoluble matter is precipitated from the ink composition.

[Inkjet ink set]
The inkjet ink set of the present invention is an inkjet recording ink set comprising a yellow ink composition, a cyan ink composition, a magenta ink composition, and a black ink composition, wherein the yellow ink composition is the yellow ink described above. The cyan ink composition contains a phthalocyanine pigment, the magenta ink composition contains a quinacridone pigment, and the black ink composition contains carbon black.

  As described above, the yellow ink composition used in the present invention is generally excellent in terms of light resistance, color developability, and storage stability. An inkjet ink set provided with the yellow ink composition is excellent in fading balance with a color ink composition other than the yellow ink composition, and can effectively prevent image deterioration due to secular change.

  Examples of the phthalocyanine pigment contained in the cyan ink composition include C.I. I. Pigment blue 1, 2, 3, 15: 3, 15: 4, 15:34, 16, 22, 60 and C.I. I. Bat blue 4, 60 and the like. These can be used alone or in combination of two or more.

  Examples of the quinacridone pigment contained in the magenta ink composition include C.I. I. Pigment Red, 5, 7, 12, 48 (Ca), 48 (Mn), 57 (Ca), 15: 1, 112, 122, 123, 168, 184, 202, 209 and C.I. I. Pigment violet 19 and the like. These can be used alone or in combination of two or more.

  The content of the phthalocyanine pigment and the quinacridone pigment in the ink composition can be appropriately changed according to the type of the ink composition such as the dark and light ink composition. In particular, the content of the pigment in the light ink composition (light ink composition) is preferably 0.1 to 1.3% by weight, and more preferably 0.4 to 1.0% by weight. .

  As the black ink composition, it is preferable to use at least two kinds of black ink compositions having different carbon black concentrations. Specifically, the carbon black has a concentration of at least 1.5% by weight black, less than 1.5% by weight to 0.6% by weight gray, and less than 0.6% by weight light gray. It is preferable to use one type, preferably two or more types.

  As described above, by having a plurality of black ink compositions having different pigment concentrations, it is possible to improve the quality of a monochrome image, improve the gradation of a low-lightness portion, stabilize the gray balance, and reduce variations. The effect of doing is obtained.

[Inkjet recording method]
The inkjet recording method of the present invention is an inkjet recording method for performing printing by discharging droplets of an ink composition and attaching the droplets to a recording medium, and the yellow ink composition described above is used as the ink composition. Alternatively, an ink set is used.

Examples of the method for discharging the ink composition include the methods described below.
As a first method, there is an electrostatic suction method, which applies a strong electric field between the nozzle and the acceleration electrode placed in front of the nozzle, and continuously ejects ink from the nozzle in the form of droplets. This is a method in which a print information signal is applied to the deflection electrode while the ink droplet is flying between the deflection electrodes for recording, or a method in which the ink droplet is ejected in response to the print information signal without being deflected.

  The second method is a method in which ink droplets are forcibly ejected by applying pressure to the ink liquid with a small pump and mechanically vibrating the nozzle with a crystal resonator or the like. The ejected ink droplet is charged simultaneously with the ejection, and a printing information signal is given to the deflection electrode and recorded while the ink droplet flies between the deflection electrodes.

  The third method is a method using a piezoelectric element, in which a pressure and a print information signal are simultaneously applied to an ink liquid by a piezoelectric element to eject and record ink droplets.

  The fourth method is a method in which the ink liquid is rapidly expanded in volume by the action of heat energy, and the ink liquid is heated and foamed with a microelectrode in accordance with a print information signal to eject and record ink droplets.

  Any of the above methods can be used in the ink jet recording method using the ink composition of the present embodiment.

  According to the ink jet recording method of the present embodiment, by using the above-described yellow ink composition or ink set, it can be used as it is without providing additional equipment in a conventionally used ink jet recording apparatus. Recorded matter having a good balance between color and color developability can be obtained, and the storability of images can be improved.

[Recordings]
The recorded matter of the present embodiment is a recorded matter recorded on a recording medium using at least the above yellow ink composition or ink set. By using the above-described ink composition or ink set, this recorded matter can be used as it is without providing additional equipment in the conventionally used inkjet recording apparatus, and has an excellent balance between light resistance and color development. In addition, it is possible to obtain a recorded material having excellent image storage stability.

1. Preparation of Ink Composition An ammonium salt of a pigment and a styrene-acrylic acid copolymer (molecular weight 10000, polymer component 38%: dispersant) is glass beads (diameter 1.7 mm, 1. 5 hours) and dispersed for 2 hours. Next, the glass beads were removed, other additives were added, and the mixture was stirred at room temperature for 30 minutes. Filtration through a 5 μm membrane filter gave ink compositions as shown in Table 1 below. The unit is% by weight unless otherwise specified.

  In Table 1, carbon black MA7 manufactured by Mitsubishi Chemical Corporation was used as the carbon black, and John Crill 61J (polymer component 30.5%) manufactured by Johnson Polymer was used as the dispersant. Further, BYK348 means a silicon surfactant manufactured by Big Chemie Japan, and Proxel XL2 means a preservative or fungicide made by AVECIA.

2. Structure of ink set The ink composition obtained as described above was combined as shown in the following table to form an ink set.

3. Evaluation Test (1) Evaluation 1: Light Resistance Of the ink sets configured in 2 above, the color ink composition is filled in an ink cartridge, and the black ink composition is mounted with a genuine cartridge, and an inkjet printer PX-5500 (Seiko) EPSON photographic paper (Seiko Epson) was used for printing.

The print pattern was a solid of 10 mm x 10 mm so that the OD value was 1.0. As the print mode, we selected “No color correction” for printer color adjustment in the high definition mode of EPSON photo paper. The produced printed sample was exposed to a dose of 70,000 Lux for 400 hours and 600 hours using a Xenon Weather Meter XL75 manufactured by Suga Test Instruments Co., Ltd., and the OD value was measured. Then, the decrease rate of the OD value after the exposure was obtained based on the OD value before the exposure, and the light resistance of the printed sample was evaluated based on the following evaluation criteria. The results are shown in Table 3.
A: OD value decrease rate is less than 20% B: OD value decrease rate is 20% or more and less than 30% C: OD value decrease rate is 30% or more

(2) Evaluation 2: Color development (saturation)
In the RGB color mode of Adobe Photoshop (registered trademark), a yellow patch with RGB values set to R = 255, G = 255, B = 0, and a red patch with R = 255, G = 0, B = 0 Green patches set with R = 0, G = 255, and B = 0 were printed in the same print mode as (1) above. After the printed sample was dried at room temperature for one day, a * and b * of the patch part were measured, C * was obtained using the following formula, and each color was determined according to the following evaluation criteria from the obtained C *. The saturation was compared. The results are shown in Table 3.

C * = [(a *) ² + (b *) ² ] ^1/2

The saturation of yellow was evaluated according to the following criteria.
A: C *> 105
B: 100 <C * <105
C: 100 ≧ C *

The saturation of red was evaluated according to the following criteria.
A: C *> 90
B: 80 <C * <90
C: 80 ≧ C *

Green saturation was evaluated according to the following criteria.
A: C *> 80
B: 70 <C * <80
C: 70 ≧ C *

(3) Evaluation 3: Storage stability The yellow pigment inks Y1 to Y8 were filled in a sealable storage bottle and left at 60 ° C. for 3 weeks. Table 4 shows the change rate of the particle diameter before and after being left standing. And storage stability was evaluated based on the following evaluation criteria.
A: The change rate of the particle diameter is less than 10% with respect to the initial stage.
B: The change rate of the particle diameter is 10% or more and less than 30% with respect to the initial value.
C: The change rate of the particle diameter is 30% or more with respect to the initial value.

(4) Comprehensive evaluation In order to clarify the effects of the embodiments based on the above evaluations 1 to 3 numerically, the ranks of the evaluations 1 to 3 are represented by points, and the overall evaluation points are obtained by multiplying the points. lead. Points were assigned as follows for each rank. From the judgment that the required function of the present invention is not present when even one C exists, the product of all the evaluation points is taken as a total evaluation point. The results are shown in Table 5.
A: 3 points B: 1 point C: 0 points

  From the above evaluation results, it can be seen that the ink composition of the present example is generally superior to the comparative example in terms of light resistance, color developability, and storage stability. Further, it can be seen that, among the examples, yellow ink using pigment yellow 213 is particularly excellent.

Claims (7)

An ink set for inkjet recording comprising a yellow ink composition, a cyan ink composition, a magenta ink composition, and a black ink composition,
The yellow ink composition is a colorant, and the yellow ink composition is C.I. I. A yellow ink composition containing CI Pigment Yellow 213 ;
The cyan ink composition comprises a phthalocyanine pigment;
The magenta ink composition comprises a quinacridone pigment;
An ink set, wherein the black ink composition comprises carbon black. The ink set according to claim 1 , wherein the content of the pigment contained in the yellow ink composition is 2 to 8% by weight. The ink set according to claim 1, wherein the yellow ink composition, the cyan ink composition, the magenta ink composition, and the black ink composition are non-radiation-type ink compositions. The content of the phthalocyanine pigment in the cyan ink composition is 0.1 to 1.3% by weight, and the content of the quinacridone pigment in the magenta ink composition is 0.1 to 1.3% by weight. The ink set according to any one of claims 1 to 3 . The black ink composition has a carbon black concentration of 1.5 wt% or more, a black ink composition having a carbon black concentration of less than 1.5 wt% to 0.6 wt% or more, and 0.6 The ink set according to any one of claims 1 to 4 , comprising one or more selected from the group consisting of black ink compositions that are less than% by weight. An ink jet recording method for performing printing by discharging droplets of an ink composition and attaching the droplets to a recording medium, wherein the ink according to any one of claims 1 to 5 is used as the ink composition. An ink jet recording method using an ink composition provided in a set. A recorded matter recorded by the ink jet recording method according to claim 6 .