JP2017206021A - Inkjet recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inkjet recording method capable of providing a high quality image, which can achieve both a low static surface tension and a high dynamic surface tension in ink, can achieve both excellent permeability and ejection stability of ink and suppresses bleeding to a medium for a concealment postcard.SOLUTION: There is provided an inkjet recording method which comprises a jetting process in which a stimulus is applied to an inkjet recording ink and the inkjet recording ink is jetted to record an image on a recording medium, where the inkjet recording ink contains water, a water-soluble organic solvent, a colorant and a surfactant and has a surface life time measured by a predetermined maximum bubble pressure method and a predetermined static surface tension, the recording medium is a medium for a concealment postcard, which has a support and a recording layer which is provided on at least one surface of the support, contains a predetermined amount of a cationic resin and laminates the surfaces of the recording layer via a peelable adhesive after recording information on the surfaces of the recording layer and the surface of the recording layer has a predetermined 10-sec Cobb size degree.SELECTED DRAWING: None

Description

  The present invention relates to an ink jet recording method, an ink jet recording apparatus, and an ink recorded matter.

The ink jet recording method is a recording method in which ink droplets are ejected from very fine nozzles and deposited on a recording medium to form characters and images. This method has been widely used in recent years because it is easier to achieve full color than other recording methods and has an advantage that a high-resolution image can be obtained even with an apparatus having a simple configuration.
Ink characteristics are indicated by physical property values such as viscosity and surface tension. By defining these physical property values, the image quality and wettability of the ink can be controlled.

  When ejecting ink droplets, a new meniscus of ink is formed at the same time as the ink droplets are ejected from the ejection port. The surface tension of the ink at this time is when the meniscus starts to form at the ejection port, immediately before ejection, at the moment of ejection, at the moment of landing, at the moment of landing on the recording medium, and when it penetrates into the recording media And so on. In particular, surface tension in the state that can be regarded as static, such as when a new meniscus surface starts to form at the discharge port or when it penetrates into recording media such as paper, and the moment when it is discharged Thus, the surface tension in a dynamic state with a fast movement is greatly different. For this reason, when evaluating the characteristics of the ink for inkjet recording, it is necessary to consider not only the static surface tension but also the dynamic surface tension which is the surface tension in a dynamic state.

  Generally, static surface tension is related to ink permeability to recording media, so it should be low to some extent. On the other hand, dynamic surface tension is related to ejection stability, so it needs to have a certain size. It becomes. It is already known that these surface tensions are controlled by the ratio of a surfactant or a wetting agent added to the ink.

  However, with the conventional control method, if the static surface tension is lowered, the dynamic surface tension is similarly lowered, and conversely, if the dynamic surface tension is raised, the static surface tension is also raised. It was difficult to secure both high tension and dynamic surface tension at appropriate strengths. For this reason, there was a problem that it was impossible to achieve both satisfactory ejection stability and permeability.

  In addition, a recording medium such as a pressure-sensitive concealed postcard in which information is recorded on the surface of the recording medium by ink jet and then a peelable adhesive layer is provided on the surface has been proposed (for example, see Patent Document 1). In this proposal, the coating layer on the surface is adjusted so that the adhesive component remains on the surface when the adhesive is applied, and as a result, the permeability of the ink also deteriorates. In order to increase the permeability of the ink to such a recording medium for concealment postcards, it is an effective means to reduce the static surface tension of the ink. The tension dropped and the discharge performance became unstable. For this reason, there has been no ink jet recording ink that has good penetrability with respect to the recording medium and can produce a high-quality image without causing bleeding.

Also, by defining the relationship between the dynamic surface tension in the fast motion state and the dynamic surface tension in the slow motion state, when used in the ink jet recording method, it has excellent ejection stability and high quality recorded images. In order to provide an ink composition that can be obtained, an ink set has been proposed in which the difference in dynamic surface tension between inks at a surface life of 100 ms and 1,000 ms is controlled (see, for example, Patent Document 2). .
However, this proposal does not take measures against the problem of low ink permeability to the recording medium, and has a problem that it cannot solve the problem of compatibility between ejection stability and permeability. Further, the present invention is not applied to a recording medium for concealment postcards, and there is a problem that a high-quality image cannot be provided to the concealment postcard medium.

  An object of the present invention is to solve the above-described problems and achieve the following objects. That is, the present invention achieves both a low static surface tension and a high dynamic surface tension in the ink, and can achieve both excellent ink permeability and ejection stability, and can bleed the cover postcard media. An object of the present invention is to provide an ink jet recording method capable of providing a suppressed high quality image.

Means for solving the problems are as follows. That is,
The inkjet recording method of the present invention is an inkjet recording method using an inkjet recording ink and a recording medium,
The inkjet recording ink contains water, a water-soluble organic solvent, a colorant and a surfactant, and satisfies the following requirements (1) to (4):
(1) The dynamic surface tension (D ₁ ) at a surface lifetime of 15 ms or more and less than 100 ms according to the maximum bubble pressure method is 30.0 mN / m to 60.0 mN / m,
(2) The dynamic surface tension (D ₂ ) at a surface lifetime of 100 ms to 3,000 ms according to the maximum bubble pressure method is 27.0 mN / m to 35.0 mN / m,
(3) D ₁ ≧ D ₂ and
(4) The static surface tension is 27.0 mN / m or less,
The recording medium, at least one of and a recording layer provided on a surface, said recording layer is a cationic resin 1.0g ^/ m ² ~2.0g / m 2 containing the support and the support And a medium for concealing postcards, in which information is recorded on the surface of the recording layer, and then the surfaces of the recording layers are pasted together via an adhesive that can be peeled off, and conforms to JIS P8140 on the surface of the recording layer. , characterized in that 10 seconds Cobb sizing degree is ^{10g / m 2 ~30g / m 2} .

  According to the present invention, the above-described problems can be solved and the object can be achieved, and the ink has both low static surface tension and high dynamic surface tension, and has excellent ink permeability. And an ink jet recording method capable of providing a high-quality image with suppressed bleeding on the cover postcard medium.

FIG. 1 is a diagram showing an example of an ink jet recording apparatus of the present invention.

(Inkjet recording method)
The inkjet recording method of the present invention is an inkjet recording method using an inkjet recording ink and a recording medium.

The ink jet recording method of the present invention preferably includes at least an ink flying step of applying a stimulus to the ink jet recording ink and causing the ink jet recording ink to fly to record an image on a recording medium. And other processes.
The stimulus is preferably at least one of heat, pressure, vibration, and light.

<Ink for inkjet recording>
The ink for ink jet recording (hereinafter sometimes simply referred to as “ink”) contains at least water, a water-soluble organic solvent, a colorant, and a surfactant, and further includes a foam suppressor, a penetrating agent, and the like as necessary. Of other ingredients.
The ink for ink jet recording satisfies the following requirements (1) to (4).
(1) The dynamic surface tension (D ₁ ) at a surface lifetime of 15 ms or more and less than 100 ms according to the maximum bubble pressure method is 30.0 mN / m to 60.0 mN / m.
(2) The dynamic surface tension (D ₂ ) at a surface lifetime of 100 ms to 3,000 ms according to the maximum bubble pressure method is 27.0 mN / m to 35.0 mN / m.
(3) D ₁ ≧ D ₂
(4) The static surface tension is 27.0 mN / m or less.

Here, the dynamic surface tension is a value measured at 24.0 ° C. to 26.0 ° C. by the maximum bubble pressure method, and is measured using, for example, a dynamic surface tension meter SITA DynaTester (manufactured by SITA Messtechnik). Can do. The “surface lifetime” is the lifetime of bubbles generated in the maximum bubble pressure method, also called bubble lifetime, from the time when a new interface is generated in the probe tip of the dynamic surface tension meter until the maximum bubble pressure is reached. Of time.
In addition, satisfying the requirements (1) to (2) above is that several points, for example, 15 ms, 150 ms, 1,500 ms, and 3,000 ms of motion in the numerical range of 15 ms to less than 100 ms to 100 ms to 3,000 ms. The target surface tension can be measured and evaluated by comparing the obtained regression curve with a predetermined numerical range of the dynamic surface tension.
Regarding the requirement (3), the surface tension (ie, dynamic surface tension) of the surfactant in a non-equilibrium state approaches the equilibrium state over time (that is, the surface life becomes longer), and eventually Equal to the static surface tension of the surfactant. Therefore, among the dynamic surface tensions (D ₁ ) at the surface lifetime of 15 ms or more and less than 100 ms by the maximum bubble pressure method, the value at a certain surface lifetime is always the dynamic surface tension at the surface lifetime of 100 ms to 3,000 ms by the maximum bubble pressure method ( Of D ₂ ), it is equal to or greater than the value at a certain surface lifetime.
Regarding the requirement (4), the static surface tension is measured at 24.0 ° C. to 26.0 ° C. using a fully automatic surface tension meter (CBVP-Z, manufactured by Kyowa Interface Science Co., Ltd.), for example. can do.

<< Surfactant >>
The surfactant is used to lower the surface tension of the ink so as to easily penetrate the recording medium, and to control the behavior of the dynamic surface tension.
The content of the surfactant is not particularly limited as long as it satisfies the requirements (1) to (4) above, and can be appropriately selected according to the purpose. 0.01 mass% to 5.0 mass% is preferable, and 0.01 mass% to 1.0 mass% is more preferable. When the content is 0.01% by mass or more, sufficient permeability to the recording medium can be secured, and the image density does not decrease. Moreover, if it is 5.0 mass% or less, a viscosity will become high too much and it will not have a bad influence on discharge stability. On the other hand, when the content is 0.01% by mass to 1.0% by mass, it is advantageous in terms of foaming and feathering.

The surfactant is not particularly limited as long as it satisfies the requirements (1) to (4) above, and can be appropriately selected according to the purpose. For example, the following general formulas (I) to (I) And a surfactant represented by III). These surfactants may be used individually by 1 type, and may use 2 types together.
_{C n F 2n + 1 -CH 2} CH (OH) CH 2 -O- (CH 2 CH 2 O) a -Y '
Formula (I)
In general formula (I), n represents an integer of 2 to 6, a represents an integer of 15 to 50, Y ′ represents —C _b H _{2b + 1} (b is an integer of 11 to 19) or —CH _{2. CH (OH) CH 2 -C d} F 2d + 1 (d is a is an integer from 2 to 6) represents a.
In general formula (II), R ¹ represents an alkylene group having 1 to 10 carbon atoms, R ² represents hydrogen or an alkyl group having 1 to 5 carbon atoms, m represents an integer of 0 to 10 and n represents 0. Represents an integer of -40, and a and b each represent an integer of 1-20.
In the general formula (III), R ³ may be the same or different from each other, and represents hydrogen, an alkyl group, or an acyl group, R ⁴ may be the same or different from each other, and —CF ₃ or —CF ₂ CF ₃ , n and p each represents an integer of 1 to 4, and m represents an integer of 1 to 25.

As the surfactant represented by the general formula (I), There are no particular restrictions and may be appropriately selected depending on the intended _{purpose, C 4 F 9 -CH 2 CH} (OH) CH 2 -O- ( _{CH 2 CH 2 O) 21 -C} 12 H 25, C 4 F 9 -CH 2 CH (OH) CH 2 -O- (CH 2 CH 2 O) 25 -C 12 H 25, C 4 F 9 -CH 2 CH _(OH), such as _{CH 2 -O- (CH 2 CH 2} O) 23 -CH 2 CH (OH) CH 2 -C 4 F 9 are preferred.

The surfactant represented by the general formula (II) is not particularly limited and may be appropriately selected depending on the intended purpose. In the general formula (II), m = 10, n = 4, R ¹ = A surfactant having CH ₂ , R ² = H, a = 6, and b = 2 is preferable.

The surfactant represented by the general formula (III) is not particularly limited and may be appropriately selected depending on the intended purpose. In the general formula (III), R ³ = H, R ⁴ = CF ₂ CF ₃ , surfactant with m = 21, n = 2, p = 2, surfactant with R ³ = H, R ⁴ = CF ₂ CF ₃ , m = 21, n = 4, p = 3, R ³ = COCF ₃ , R ⁴ = CF ₂ CF ₃ , m = 10, n = 2, surfactant where p = 2, R ³ = COCF ₃ , R ⁴ = CF ₂ CF ₃ , m = 20, n = 4, surfactants with p = 4, surfactants with R ³ = COH, R ⁴ = CF ₂ CF ₃ , m = 20, n = 4, p = 4 are preferable.

<< Water-soluble organic solvent >>
The water-soluble organic solvent is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include ethylene glycol, diethylene glycol, 1,3-butanediol, 3-methyl-1,3-butanediol, Ethylene glycol, polyethylene glycol, polypropylene glycol, 1,5-pentanediol, 1,6-hexanediol, glycerin, 1,2,6-hexanetriol, ethyl-1,2,4-butanetriol, 1,2,3 Polyhydric alcohols such as butanetriol and 3-methylpentane-1,3,5-triol; ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol Polyhydric alcohol alkyl ethers such as monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether; Polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether; 2-pyrrolidone, N-methyl Nitrogen-containing heterocyclic compounds such as 2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone, 1,3-dimethylimidazolidinone, ε-caprolactam, γ-butyrolactone; formamide, N-methylformamide, N, N-dimethyl Amides such as formamide; amines such as monoethanolamine, diethanolamine and triethylamine; sulfur-containing compounds such as dimethylsulfoxide, sulfolane and thiodiethanol; propylene carbonate Boneito include such as ethylene carbonate is. These water-soluble organic solvents may be used individually by 1 type, and may use 2 types together.
Among these, 1,3-butanediol, diethylene glycol, triethylene glycol, glycerin, and the like are preferable in that an excellent effect is obtained in preventing discharge failure due to water evaporation.

<< Colorant >>
The colorant is used for coloring the ink and improving the image density, and is not particularly limited and can be appropriately selected from known pigments and dyes according to the purpose. Is preferred.

There is no restriction | limiting in particular as content in the said inkjet recording ink of the said pigment, Although it can select suitably according to the objective, 0.1 mass%-50.0 mass% are preferable, 0.1 mass% -20.0 mass% is more preferable.
The 50% particle diameter (median diameter, D50) of the pigment is preferably 150 nm or less, and more preferably 100 nm or less. Here, the value of “D50” is measured by a dynamic light scattering method using Microtrack UPA manufactured by Nikkiso Co., Ltd. in an environment of 23 ° C. and 55% RH.

  The pigment may be either an inorganic pigment or an organic pigment, and may be used alone or in combination of two or more.

  The inorganic pigment is not particularly limited and may be appropriately selected depending on the intended purpose. For example, titanium oxide, iron oxide, calcium carbonate, barium sulfate, aluminum hydroxide, barium yellow, bitumen, cadmium red, chrome yellow , Metal powder, carbon black, and the like. Among these, carbon black is preferable, and examples thereof include those produced by known methods such as a contact method, a furnace method, and a thermal method.

The organic pigment is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include azo pigments, azomethine pigments, polycyclic pigments, dye chelates, nitro pigments, nitroso pigments, and aniline black. . Among these, azo pigments and polycyclic pigments are more preferable.
There is no restriction | limiting in particular as said azo pigment, According to the objective, it can select suitably, For example, an azo lake, an insoluble azo pigment, a condensed azo pigment, a chelate azo pigment etc. are mentioned.
The polycyclic pigment is not particularly limited and may be appropriately selected depending on the intended purpose.For example, phthalocyanine pigment, perylene pigment, perinone pigment, anthraquinone pigment, quinacridone pigment, dioxazine pigment, indigo pigment, thioindigo Pigments, isoindolinone pigments, quinofullerone pigments, rhodamine B lake pigments and the like.
There is no restriction | limiting in particular as said dye chelate, According to the objective, it can select suitably, For example, basic dye type chelate, acidic dye type chelate, etc. are mentioned.

The pigment for black ink is not particularly limited and may be appropriately selected depending on the intended purpose. For example, carbon black such as furnace black, lamp black, acetylene black, channel black (CI Pigment Black 7) , Copper, iron (CI pigment black 11), metals such as titanium oxide, and organic pigments such as aniline black (CI pigment black 1).
As the carbon black, a furnace method, a carbon black produced by the channel method, primary particle diameter of 15Nm～40nm, the BET specific surface area of ^{50m 2 / g~300m 2 / g,} DBP oil absorption amount 40 mL / 100 g ˜150 mL / 100 g, volatile content of 0.5% to 10% and pH value of 2 to 9 are preferred.
There is no restriction | limiting in particular as a commercial item of the said carbon black, According to the objective, it can select suitably, For example, it is No. 2300, no. 900, MCF-88, no. 33, no. 40, no. 45, no. 52, MA7, MA8, MA100, no. 2200B (all manufactured by Mitsubishi Chemical Corporation); Raven700, 5750, 5250, 5000, 3500, 1255 (all manufactured by Colombian Chemical); Regal400R, 330R, 660R, Mogulu L, Monoarch 700, 800, 880, 900, 1000, 1100, 1300, Monarch 1400 (all manufactured by Cabot Japan Co., Ltd.); Color Black FW1, FW2, FW2V, FW18, FW100, FW200 , S150, S160, S170, Printex 35, U, V, 140U, 140V, Special Black 6, 5, 4A, 4 (all manufactured by Evonik Degussa Japan) Is mentioned.

  Examples of commercially available color ink pigments include yellow inks such as C.I. I. Pigment yellow 1, C.I. I. Pigment yellow 2, C.I. I. Pigment yellow 3, C.I. I. Pigment yellow 12, C.I. I. Pigment yellow 13, C.I. I. Pigment yellow 14, C.I. I. Pigment yellow 16, C.I. I. Pigment yellow 17, C.I. I. Pigment yellow 73, C.I. I. Pigment yellow 74, C.I. I. Pigment yellow 75, C.I. I. Pigment yellow 83, C.I. I. Pigment yellow 93, C.I. I. Pigment yellow 95, C.I. I. Pigment yellow 97, C.I. I. Pigment yellow 98, C.I. I. Pigment yellow 114, C.I. I. Pigment yellow 120, C.I. I. Pigment yellow 128, C.I. I. Pigment yellow 129, C.I. I. Pigment yellow 138, C.I. I. Pigment yellow 150, C.I. I. Pigment yellow 151, C.I. I. Pigment yellow 154, C.I. I. Pigment yellow 155, C.I. I. Pigment yellow 174, C.I. I. And CI Pigment Yellow 180.

  For magenta ink, for example, C.I. I. Pigment red 5, C.I. I. Pigment red 7, C.I. I. Pigment red 12, C.I. I. Pigment red 48 (Ca), C.I. I. Pigment red 48 (Mn), C.I. I. Pigment red 57 (Ca), C.I. I. Pigment red 57: 1, C.I. I. Pigment red 112, C.I. I. Pigment red 122, C.I. I. Pigment red 123, C.I. I. Pigment red 146, C.I. I. Pigment red 168, C.I. I. Pigment red 176, C.I. I. Pigment red 184, C.I. I. Pigment red 185, C.I. I. Pigment Red 202, Pigment Violet 19 and the like.

For cyan ink, for example, C.I. I. Pigment blue 1, C.I. I. Pigment blue 2, C.I. I. Pigment blue 3, C.I. I. Pigment blue 15, C.I. I. Pigment blue 15: 3, C.I. I. Pigment blue 15: 4, C.I. I. Pigment blue 15:34, C.I. I. Pigment blue 16, C.I. I. Pigment blue 22, C.I. I. Pigment blue 60, C.I. I. Pigment blue 63, C.I. I. Pigment blue 66; C.I. I. Bat Blue 4, C.I. I. Examples include Bat Blue 60.
In addition to the above-mentioned commercially available products, those newly produced for the present invention can also be used.
If Pigment Yellow 74 is used as the yellow pigment, Pigment Red 122, Pigment Bio Red 19 as the magenta pigment, and Pigment Blue 15: 3 as the cyan pigment, an ink having excellent color tone and light resistance and well-balanced can be obtained. .

As the dye, those having excellent water resistance and light resistance among dyes classified in the color index into acid dyes, direct dyes, basic dyes, reactive dyes, and food dyes are used. These dyes may be used as a mixture of a plurality of types, or may be used as a mixture with other colorants such as pigments as necessary. However, it is necessary to add other colorants as long as the effects of the present invention are not inhibited.
Specific examples of the dye include those shown in the following (a) to (d).

(A) Acid dyes and food dyes C.I. I. Acid Yellow 17, 23, 42, 44, 79, 142
・ C. I. Acid Red 1,8,13,14,18,26,27,35,37,
42, 52, 82, 87, 89, 92, 97, 106, 111, 114, 115,
134,186,249,254,289
・ C. I. Acid Blue 9, 29, 45, 92, 249
・ C. I. Acid Black 1, 2, 7, 24, 26, 94
・ C. I. Food Yellow 3, 4
・ C. I. Food Red 7, 9, 14
・ C. I. Food Black 1, 2

(B) Direct dye, C.I. I. Direct yellow 1,12,24,26,33,44,50,86,
120, 132, 142, 144
・ C. I. Direct Red 1, 4, 9, 13, 17, 20, 28, 31, 39,
80, 81, 83, 89, 225, 227
・ C. I. Direct orange 26, 29, 62, 102
・ C. I. Direct Blue 1, 2, 6, 15, 22, 25, 71, 76, 79,
86, 87, 90, 98, 163, 165, 199, 202
・ C. I. Direct black 19, 22, 32, 38, 51, 56, 71,
74, 75, 77, 154, 168, 171

(C) Basic dye, C.I. I. Basic yellow 1, 2, 11, 13, 14, 15, 19, 21,
23, 24, 25, 28, 29, 32, 36, 40, 41, 45, 49, 51,
53, 63, 64, 65, 67, 70, 73, 77, 87, 91
・ C. I. Basic Red 2, 12, 13, 14, 15, 18, 22, 23,
24, 27, 29, 35, 36, 38, 39, 46, 49, 51, 52, 54,
59, 68, 69, 70, 73, 78, 82, 102, 104, 109, 112
・ C. I. Basic blue 1,3,5,7,9,21,22,26,35,
41, 45, 47, 54, 62, 65, 66, 67, 69, 75, 77, 78,
89, 92, 93, 105, 117, 120, 122, 124, 129, 137,
141, 147, 155
・ C. I. Basic Black 2,8

(D) Reactive dyes, C.I. I. Reactive Black 3, 4, 7, 11, 12, 17
・ C. I. Reactive Yellow 1,5,11,13,14,20,21,22
25, 40, 47, 51, 55, 65, 67
・ C. I. Reactive Red 1,14,17,25,26,32,37,44,
46, 55, 60, 66, 74, 79, 96, 97
・ C. I. Reactive Blue 1, 2, 7, 14, 15, 23, 32, 35,
38, 41, 63, 80, 95

<< Other ingredients >>
-Foam suppressant-
The ink for ink jet recording may contain a foam suppressor in order to prevent foaming of the ink.
There is no restriction | limiting in particular as said foam suppressant, According to the objective, it can select suitably, For example, what is represented with the following general formula (IV) etc. is mentioned.
_{HOR 1 R 3 C- (CH 2} ) m -CR 2 R 4 OH Formula (IV)
In general formula (IV), R ₁ and R ₂ independently represent an alkyl group having 3 to 6 carbon atoms, R ₃ and R ₄ independently represent an alkyl group having 1 to 2 carbon atoms, m represents an integer of 1 to 6.
Among these, 2,4,7,9-tetramethyldecane-4,7-diol is preferable in that it exhibits an excellent effect of suppressing foam.

  There is no restriction | limiting in particular as content in the said ink of the said foam suppressor, Although it can select suitably according to the objective, 0.01 mass%-10 mass% are preferable, 0.02 mass%-5 mass % Is more preferable. If the content of the antifoaming agent is less than 0.01% by mass, the antifoaming effect may not be sufficiently obtained. If the content exceeds 10% by mass, the effect of antifoaming property changes even if the amount added is increased. In some cases, the foam suppressor may not dissolve in the ink.

-Penetration agent-
The ink for ink jet recording may contain a penetrating agent in order to increase the permeability to the recording medium.
The penetrant is not particularly limited and may be appropriately selected depending on the intended purpose. For example, 2-ethyl-1,3-hexanediol, ethanol, isopropyl alcohol, ethylene glycol-n-butyl ether, alkylbenzene sulfonic acid Salts, alkylbetaines, 2,2,4-trimethyl-1,3-pentanediol, and the like. Among these, 2-ethyl-1,3-hexanediol is preferable in terms of storage stability.

  There is no restriction | limiting in particular as content in the said ink of the said penetrating agent, Although it can select suitably according to the objective, 0.1 mass%-4.5 mass% are preferable. If the content is less than 0.1% by mass, the drying property may be lowered and bleeding may occur in the recorded image. Further, if the content exceeds 4.5% by mass, the dispersion stability of the colorant is impaired, the nozzle of the recording device is likely to be clogged, or the permeability to the recording medium is unnecessarily high, In some cases, the density of the recorded matter may be reduced or the showthrough may occur.

The physical properties of the ink for ink jet recording are not particularly limited as long as the requirements (1) to (4) are satisfied with respect to the surface tension, and can be appropriately selected according to the purpose. (1) Maximum bubble pressure method The dynamic surface tension at a surface lifetime of 15 ms to less than 100 ms is 30.0 mN / m to 60.0 mN / m, preferably 30.0 mN / m to 45.0 mN / m. When the dynamic surface tension is 30.0 mN / m to 45.0 mN / m, it is advantageous in terms of the initial filling property to the head.
(2) The dynamic surface tension at a surface lifetime of 100 ms to 3,000 ms according to the maximum bubble pressure method is not particularly limited as long as it is 27.0 mN / m to 35.0 mN / m, and is appropriately selected according to the purpose. can do.
Moreover, as (4) static surface tension, if it is 27.0 mN / m or less, there will be no restriction | limiting in particular, According to the objective, it can select suitably.

The physical properties of the ink for ink jet recording are not particularly limited as long as the requirements (1) to (4) are satisfied with respect to the surface tension, and can be appropriately selected according to the purpose. It is preferable that it is the range of these.
The viscosity of the ink for inkjet recording is preferably 5 mPa · sec to 20 mPa · sec at 25 ° C., more preferably 5 mPa · sec to 10 mPa · sec. If the viscosity exceeds this range, it may be difficult to ensure ejection stability.
The pH of the inkjet recording ink is preferably 7 to 10.

  The ink for inkjet recording of the present invention is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include black ink, cyan ink, magenta ink, and yellow ink. When recording is performed using an ink set in which two or more of these inks are used in combination, a multicolor image can be formed, and an ink set using at least black ink, cyan ink, magenta ink, and yellow ink is used. When recording is performed, a full-color image can be formed.

<Recording media>
The recording medium, at least one of and a recording layer provided on a surface, said recording layer is a cationic resin 1.0g ^/ m ² ~2.0g / m 2 containing the support and the support And a medium for concealing postcards, in which information is recorded on the surface of the recording layer, and then the surfaces of the recording layers are pasted together via an adhesive that can be peeled off, and conforms to JIS P8140 on the surface of the recording layer. The 10 second Cobb sizing degree is 10 g / m ^{2 to} 30 g / m ² .
There is no restriction | limiting in particular as said recording medium, According to the objective, it can select suitably, For example, the recording sheet etc. which were described in Unexamined-Japanese-Patent No. 2001-219680 are mentioned. Moreover, a commercial item can be used, As this commercial item, DF color IJP2.0 (Mitsubishi Paper Co., Ltd.), Brightmail IJ (Daiou Paper Co., Ltd.), etc. are mentioned.
Here, the medium for concealment postcards means that a recording medium provided with information on an opaque support is folded in two or three, or two sheets are overlapped and adhered by peelable adhesion, and apparently a sheet of one sheet. It is a recording medium such as a peelable postcard, a concealed postcard, or a crimped postcard that can be mailed as a postcard and can be peeled off by the recipient to peel off the peelable adhesive portion.

<< Support >>
If it is opaque, there will be no restriction | limiting in particular as said support body, According to the objective, it can select suitably, For example, commercially available quality paper etc. are mentioned.

<< Recording layer >>
As the recording layer, if a cationic resin as it contains ^{1.0g / m 2 ~2.0g / m 2} , not particularly limited and may be appropriately selected depending on the intended purpose.
-Cationic resin-
There is no restriction | limiting in particular as said cationic resin, According to the objective, it can select suitably, For example, the alkylamine epihalohydrin polycondensate which is 20,000 or less molecular weight described in Unexamined-Japanese-Patent No. 2001-219680 , Dimethylamine / epichlorohydrin polycondensate, dimethylamine / ammonia / epichlorohydrin condensate, poly (trimethylaminoethyl methacrylate / methyl sulfate), diallylamine hydrochloride / acrylamide copolymer, poly (diallylamine hydrochloride / sulfur dioxide), Polyallylamine hydrochloride, poly (allylamine hydrochloride / diallylamine hydrochloride), acrylamide / diallylamine copolymer, polyvinylamine copolymer, dicyandiamide, dicyandiamide / ammonium chloride / urea / formaldehyde , Polyalkylene polyamine dicyandiamide ammonium salt condensate, dimethyl diallyl ammonium chloride, poly diallyl methyl amine hydrochloride, poly (diallyl dimethyl ammonium chloride), poly (diallyl dimethyl ammonium chloride, sulfur dioxide), poly (diallyl dimethyl ammonium chloride, Diallylamine hydrochloride derivatives), acrylamide / diallyldimethylammonium chloride copolymer, acrylate / acrylamide / diallylamine hydrochloride copolymer, polyethyleneimine, ethyleneimine derivatives such as acrylicamine polymer, and polyethyleneimine alkylene oxide modified products It is done. These may be used individually by 1 type and may use 2 or more types together.

<< Adhesive >>
The adhesive is not particularly limited as long as it can be peeled off, and can be appropriately selected according to the purpose. For example, natural rubber, modified natural rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, ethylene -Vinyl acetate copolymer resin, acrylic ester resin, vinyl chloride resin, vinylidene chloride resin, thermoplastic elastomer, etc. are mentioned, and these are used in the form of an emulsion, or a mixture of one or more. Among these, the adhesive strength at 180 ° peeling is preferably 30 gf / 25 mm to 200 gf / 25 mm. Examples of such an adhesive include 20 mass% to 30 mass% of alkenyl succinic anhydride sodium salt, acrylic emulsion Adhesive containing 5% by mass to 15% by mass and 5% by mass to 15% by mass of silica; 5 parts of an inorganic filler such as microsilica and an additive such as corn starch with respect to 100 parts by mass of an adhesive main agent such as natural rubber latex Adhesives added at a ratio of from 100 parts by mass to 100 parts by mass, and added with a silane coupling agent such as γ-mercaptopropyltrimethoxysilane in an amount of 0.1% by mass to 1% by mass; Adhesives added with resins and other additives that are not compatible with the adhesive main agent, such as polyvinyl alcohol Etc.
Here, the adhesive strength is the strength when a concealed postcard is cut into a strip shape with a width of 25 mm and peeled 180 ° at a peeling speed of 300 mm / min with a Tensilon universal tensile tester.

In the recording medium, the transfer amount of pure water at a contact time of 100 ms measured with a dynamic scanning absorptiometer is not particularly limited and may be appropriately selected depending on the intended purpose, but is 2 mL / m ^{2 to} 30 mL. is preferably ^{/ m 2, 2mL / m 2} ~15mL / m 2 is more preferable. If the transfer amount is less than 2 mL / m ² , color bleeding or beading may occur, and if it exceeds 30 mL / m ² , character bleeding may occur or the image density may decrease. is there. Meanwhile, the transfer amount ^{is 2mL / m 2 ~15mL / m 2} , is advantageous in fine line resolution.

  In the recording medium, when 5 μL of the ink jet recording ink droplet is dropped on the surface, the contact angle at 100 ms after dropping is not particularly limited and may be appropriately selected according to the purpose. It is preferable that it is (degree)-32 degrees. If the contact angle is less than 16 °, character bleeding may occur, and if it exceeds 32 °, color bleeding or beading may occur.

(Inkjet recording device)
The ink jet recording apparatus of the present invention has at least ink flying means, and further includes other means as necessary.
The ink flying means is means for applying a stimulus to the ink jet recording ink and causing the ink jet recording ink to fly to record an image on a recording medium. The ink jet recording ink and the recording medium are The inkjet recording ink and the recording medium described in the inkjet recording method of the invention.
The stimulus is preferably at least one of heat, pressure, vibration, and light.

FIG. 1 shows an example of the ink jet recording apparatus of the present invention. This recording apparatus forms an image by ejecting ink of four colors (black, cyan, magenta, yellow) onto a recording medium such as printing paper.
The ink jet recording apparatus 1 includes four ink jet heads 11 that eject ink of each color, a carriage 12 on which these heads are mounted, and a carriage 12 that moves in the main scanning direction (left and right in the figure) by a drive system (not shown). A guide rod 13 for guiding the printing paper and a paper transport mechanism 14 for transporting the printing paper P in the sub-scanning direction (vertical direction in the figure). The paper transport mechanism 14 includes a transport roller 15 that is rotated by a drive system (not shown), a tension roller 16, and a transport belt 17 that is stretched between them.
Each inkjet head 11 includes a piezoelectric actuator made of a piezoelectric element. Of course, another actuator for discharging ink, for example, a thermal actuator, a shape memory alloy actuator, or an electrostatic actuator may be provided.
Further, the ink jet recording apparatus 1 is mounted on the carriage 12 with four ink cartridges 18 each containing ink of each color, is connected to each ink jet head 11, and each of the four ink cartridges 18 is mounted on a broken line portion in the figure. 4 sub tanks 19 and ink supply tubes (not shown) communicating the respective ink cartridges 18 and the respective sub tanks 19, and the inks of the respective colors accommodated in the respective ink cartridges 18 pass through the respective sub tanks 19. The ink jet heads 11 are supplied to the inkjet heads 11. That is, the liquid flow path of the ink jet recording apparatus 1 is configured by the ink supply tube, the sub tank 19, and the in-head flow path of the ink jet head 11. The ink supply tube is provided with a supply pump (not shown) for supplying the ink in the ink cartridge 18 to the sub tank 19.

(Ink record)
The ink recorded matter of the present invention has an image formed on the recording medium using the ink jet recording method of the present invention.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example, this invention is not restrict | limited to a following example.

-Example of dispersion-
<Dispersion Production Example 1: Cyan Dispersion>
With reference to Preparation Example 3 of JP-A-2001-13949, first, as a polymer solution, the inside of a 1 L flask equipped with a mechanical stirrer, thermometer, nitrogen gas introduction tube, reflux tube and dropping funnel is sufficiently After substitution with nitrogen gas, 11.2 g of styrene, 2.8 g of acrylic acid, 12.0 g of lauryl methacrylate, 4.0 g of polyethylene glycol methacrylate, styrene macromer (trade name: AS-6, manufactured by Toagosei Co., Ltd.) 0 g and 0.4 g of mercaptoethanol were charged and the temperature was raised to 65 ° C. Next, 100.8 g of styrene, 25.2 g of acrylic acid, 108.0 g of lauryl methacrylate, 36.0 g of polyethylene glycol methacrylate, 60.0 g of hydroxyethyl methacrylate, styrene macromer (trade name: AS-6, manufactured by Toagosei Co., Ltd.) A mixed solution of 36.0 g, mercaptoethanol 3.6 g, azobisdimethylvaleronitrile 2.4 g and methyl ethyl ketone 18 g was dropped into the flask over 2.5 hours.

  After completion of dropping, a mixed solution of 0.8 g of azobisdimethylvaleronitrile and 18 g of methyl ethyl ketone was dropped into the flask over 0.5 hours. After aging at 65 ° C. for 1 hour, 0.8 g of azobisdimethylvaleronitrile was added, and further aging was performed for 1 hour. After completion of the reaction, 364 g of methyl ethyl ketone was added to the flask to obtain 800 g of a polymer solution having a concentration of 50% by mass. Next, a part of the obtained polymer solution was dried and measured by gel permeation chromatography (standard: polystyrene, solvent: tetrahydrofuran), and the weight average molecular weight was 15,000.

28 g of the polymer solution obtained above, 26 g of copper phthalocyanine pigment, 13.6 g of 1 mol / L potassium hydroxide aqueous solution, 20 g of methyl ethyl ketone and 30 g of ion-exchanged water were sufficiently stirred. Thereafter, the mixture was kneaded 20 times using a three-roll mill (manufactured by Noritake Company, trade name: NR-84A). The obtained paste was put into 200 g of ion-exchanged water and sufficiently stirred, and then methyl ethyl ketone and water were distilled off using an evaporator to obtain a blue polymer fine particle dispersion having a solid content of 20.0% by mass [cyanide Dispersion] 160 g was obtained.
The 50% particle diameter (median diameter, D50) measured by Microtrac UPA of the polymer fine particles was 98 nm.

<Dispersion Production Example 2: Magenta Dispersion>
Except that the copper phthalocyanine pigment of Dispersion Production Example 1 was changed to Pigment Pigment Red 122, 160 g of [Magenta Dispersion], a red-purple polymer fine particle dispersion, was obtained in the same manner as Dispersion Production Example 1. The 50% particle diameter (median diameter, D50) of the polymer fine particles measured by Microtrac UPA was 124 nm.

<Dispersion Production Example 3: Yellow Dispersion>
Except that the copper phthalocyanine pigment of Dispersion Production Example 1 was changed to Pigment Pigment Yellow 74, 160 g of [Yellow Dispersion] as a yellow polymer fine particle dispersion was obtained in the same manner as Dispersion Production Example 1. The 50% particle diameter (median diameter, D50) of the polymer fine particles measured by Microtrac UPA was 78 nm.

<Dispersion Production Example 4: Black Dispersion>
[Black dispersion] 160 g which is a black polymer fine particle dispersion in the same manner as in Dispersion Production Example 1, except that the copper phthalocyanine pigment in Dispersion Production Example 1 was changed to carbon black (Evonik Degussa Japan Co., Ltd., FW100). Got. The 50% particle size (median diameter, D50) of the polymer fine particles measured by Microtrac UPA was 110 nm.

-Ink preparation examples, examples, comparative examples-
Using the dispersion production examples 1 to 4, inks of ink preparation examples 1 to 52 were prepared according to the formulations shown in Tables 1 to 13.
Specifically, after preparing materials in the order of a water-soluble organic solvent, a surfactant, a foam suppressor (antifoaming agent), a penetrant, and ion-exchanged water and stirring for 30 minutes, the dispersion production examples 1 to 4 described above And stirred for 30 minutes, and then filtered through a membrane filter having a pore size of 0.8 μm to obtain an ink. The ink sets of Examples 1 to 7 and Comparative Examples 1 to 6 were obtained by combining the four colors of ink.
In addition, the number in Tables 1-13 is "mass%", and surfactant is as follows.

・ Surfactant A
In the following general formula (I) in, n = 4, a = 21 , b = 12 as the _{C n F 2n + 1 -CH 2} CH (OH) CH 2 -O- (CH 2 CH 2 O) a -Y '
Formula (I)
・ Surfactant B
In the following general formula (II), m = 10, n = 4, R ¹ = CH ₂ , R ² = H, a = 6, b = 2
・ Surfactant C
In the following general formula (III), R ³ = H, R ⁴ = CF ₂ CF ₃ , m = 21, n = 2, p = 2
・ Surfactant D
In the following general formula (V), m = 3 and n = 13 CF ₃ CF ₂ (CF ₂ CF ₂ ) _m —CH ₂ CH ₂ O (CH ₂ CH ₂ O) _n H
General formula (V)
・ Surfactant E
ECTD-3NEX (Nikko Chemicals)
・ Surfactant F
In the above general formula (I), n = 4, a = 23, d = 4. Surfactant G
In the above general formula (III), R ³ = COCF ₃ , R ⁴ = CF ₂ CF ₃ , m = 10, n = 2, p = 2

The meanings of the abbreviations in Tables 10 and 11 are as follows.
・ KM-72F: Self-emulsifying type silicone antifoaming agent
(Shin-Etsu Silicone Co., Ltd., 100 mass% component)
BYK-1615: silicone-based antifoaming agent
(Bic Chemie Japan Co., Ltd., 100 mass% component)

<Evaluation>
The produced ink preparation examples 1 to 52 were evaluated as follows.

<Surface tension>
Tables 14 to 20 show the relationship between dynamic surface tension and surface lifetime and static surface tension of Ink Preparation Examples 1 to 52 prepared in Examples and Comparative Examples. The dynamic surface tension was measured by a maximum bubble pressure method using a dynamic surface tension meter SITA DynaTester (manufactured by SITA Messtechnik). Static surface tension was measured using a fully automatic surface tension meter (CBVP-Z, manufactured by Kyowa Interface Science Co., Ltd.). The numbers in Tables 14 to 20 are values measured at 25 ° C. ± 0.5 ° C., and the unit is “mN / m”.
In order to suppress color bleed, it is desirable that the inks of four colors, cyan, magenta, yellow and black, have the same surface tension.

<Contact angle>
The contact angles of the ink preparation examples 1 to 52 prepared in the examples and comparative examples with respect to the recording medium were measured. The results are shown in Table 21. For the measurement of the contact angle with ink, OCA200H manufactured by Kyowa Interface Chemical Co., Ltd. was used, 5 μL of ink was dropped from a microsyringe onto the recording medium, and the contact angle value of 100 ms after dropping was defined as the contact angle.
[Recording paper 1] and [Recording paper 2] were used as recording media. [Recording paper 1] is DF color IJP 2.0 (manufactured by Mitsubishi Paper Industries), and [Recording paper 2] is My paper (manufactured by Ricoh Co., Ltd.). It is. DF color IJP 2.0 is a cover postcard medium having a recording layer containing 1.5 g / m ² of a cationic resin on its surface, and my paper is plain paper. The respective 10 second Cobb sizing degrees were 15.0 g / m ² and 20.8 g / m ² . Moreover, the transfer amount of the pure water to each medium in the contact time of 100 ms by a dynamic scanning absorption meter was 7.4 mL / m ² and 14.7 mL / m ² .

<Penetration>
Using a printer (IPSio GXe3300, manufactured by Ricoh Co., Ltd.), printing was performed on [Recording paper 1] and [Recording paper 2]. In a chart in which the print pattern is in the image area, the print area is the entire area of the paper, and the print area of each color is 5% of the print area, each of yellow, magenta, cyan, and black inks of the present invention is printed at 100% duty. The printing conditions were one-pass printing with a recording density of 600 dpi.
Thirty seconds after printing, My Paper (manufactured by Ricoh Co., Ltd.) was placed on the printing surface and rubbed back and forth in the same straight line 20 times while applying a 1 kg load. After the rubbing, the ink stain on the My Paper was evaluated according to the following criteria.
[Evaluation criteria]
A: Almost no ink smudges are observed B: Some areas where ink smudges are dark are recognized C: Overall ink stains are recognized D: Overall severe ink smudges are observed Range. The evaluation results are shown in Table 22.

<Discharge stability>
Using a printer (Ricoh Co., Ltd., IPSio GXe3300), printing is performed on My Paper (Ricoh Co., Ltd.). The print pattern is in the image area, the print area is the entire area of the paper, and the print area of each color is 5%. In one chart, the yellow, magenta, cyan, and black inks of the present invention were printed at 100% duty. The printing conditions were one-pass printing with a recording density of 600 dpi.
As intermittent printing, after the above chart was printed continuously for 20 sheets, it was put into a resting state in which no discharge was performed for 20 minutes, this was repeated 50 times, and after a total of 1,000 sheets were printed, the chart was printed again The presence or absence of streaks, white spots, and jet disturbance in the 5% chart solid portion was visually evaluated.
[Evaluation criteria]
AA: There are no streaks, white spots, or jet disturbance in the solid part.
A: In the first scan, streaks, white spots, and jet disturbance in one or more channels are recognized.
B: On the first scan, some streaks, white spots, and jet disturbance are observed in the solid portion.
C: On the first scan, streaks, white spots, and jet disturbance are observed.
D: Streaks, white spots, and jet turbulence are observed throughout the solid portion.
In these standards, A or more is set as an allowable range. The evaluation results are shown in Table 23.

<Bleed evaluation between black and color>
Using a printer (IPSio GXe3300, manufactured by Ricoh Co., Ltd.), printing was performed on [Recording paper 1] and [Recording paper 2]. As a printing pattern, cyan ink, magenta ink, and yellow ink were printed at 100% duty. Black ink characters were printed in the solid image portion of each color ink thus obtained, and bleeding (bleeding) between the color ink and the black ink was visually and visually evaluated according to the following criteria. The recording density of printing conditions was 600 dpi and one-pass printing.
[Evaluation criteria]
AA: There is no bleed, black characters can be clearly recognized, loupe observation and
There is no visible blur.
A: There is no bleed, black characters can be clearly recognized, and bleeding is observed with a magnifier.
Slightly recognized, but no visible blur is observed.
B: There is no bleed, black characters can be clearly recognized, and bleeding is observed by magnifying glass.
Although it is recognized, there is no visible blur.
C: Slight bleeding occurs and black characters blur slightly.
D: Bleed occurs and it is difficult to recognize black characters.
In these standards, B or more is set as an allowable range. The evaluation results are shown in Table 24.

In the evaluation of penetrability, according to the comparison between the inks of Examples 1 to 7 and Comparative Examples 1 to 6, in the cover postcard media, the penetrability is improved by setting the surface tension of the ink to an appropriate value. I understand that.
In the evaluation of the ejection stability, according to the comparison between the inks of Examples 1 to 7 and Comparative Examples 1 and 2, in the cover postcard medium, the ejection stability is affected even if the surface tension is too high or too low. I can see that.
In the bleed evaluation, according to the comparison between Examples 1 to 7 and Comparative Examples 1 to 6, in the cover postcard medium, the surface tension of the color ink and the black ink is set to an appropriate value, thereby absorbing the ink. Bleeding can be suppressed because the vehicle permeates even the poorly concealed postcard media and the coloring material remains uniformly on the paper surface.

Aspects of the present invention are as follows, for example.
<1> including a flying step of applying a stimulus to the inkjet recording ink, causing the inkjet recording ink to fly, and recording an image on a recording medium;
The inkjet recording ink contains water, a water-soluble organic solvent, a colorant and a surfactant, and satisfies the following requirements (1) to (4):
(1) The dynamic surface tension (D ₁ ) at a surface lifetime of 15 ms or more and less than 100 ms according to the maximum bubble pressure method is 30.0 mN / m to 60.0 mN / m,
(2) The dynamic surface tension (D ₂ ) at a surface lifetime of 100 ms to 3,000 ms according to the maximum bubble pressure method is 27.0 mN / m to 35.0 mN / m,
(3) D ₁ ≧ D ₂ and
(4) The static surface tension is 27.0 mN / m or less,
The recording medium, at least one of and a recording layer provided on a surface, said recording layer is a cationic resin 1.0g ^/ m ² ~2.0g / m 2 containing the support and the support And a medium for concealing postcards, in which information is recorded on the surface of the recording layer, and then the surfaces of the recording layers are pasted together via an adhesive that can be peeled off, and conforms to JIS P8140 on the surface of the recording layer. , 10 seconds Cobb sizing degree is an ink jet recording method which is a ^{10g / m 2 ~30g / m 2} .
<2> The ink jet recording method according to <1>, wherein an ink set including at least four colors of black ink, cyan ink, magenta ink, and yellow ink is used as the ink for ink jet recording.
<3> The inkjet recording method according to any one of <1> to <2>, wherein the surfactant is at least one of the surfactants represented by the following general formulas (I) to (III). .
_{C n F 2n + 1 -CH 2} CH (OH) CH 2 -O- (CH 2 CH 2 O) a -Y '
Formula (I)
In general formula (I), n represents an integer of 2 to 6, a represents an integer of 15 to 50, Y ′ represents —C _b H _{2b + 1} (b is an integer of 11 to 19) or —CH _{2. CH (OH) CH 2 -C d} F 2d + 1 (d is a is an integer from 2 to 6) represents a.
In general formula (II), R ¹ represents an alkylene group having 1 to 10 carbon atoms, R ² represents hydrogen or an alkyl group having 1 to 5 carbon atoms, m represents an integer of 0 to 10 and n represents 0. Represents an integer of -40, and a and b each represent an integer of 1-20.
In the general formula (III), R ³ may be the same or different from each other, and represents hydrogen, an alkyl group, or an acyl group, R ⁴ may be the same or different from each other, and —CF ₃ or —CF ₂ CF ₃ , n and p each represents an integer of 1 to 4, and m represents an integer of 1 to 25.
<4> In the recording medium, the transfer amount of pure water at the contacting time 100ms measured by a dynamic scanning liquid absorption ^meter, either the a 2mL / ^{m 2} ~30mL / m 2 of <1> to <3> The inkjet recording method described in 1.
<5> The recording medium according to any one of <1> to <4>, wherein a contact angle at 100 ms after dropping when a 5 μL droplet of inkjet recording ink is dropped on the surface of the recording medium is 16 ° to 32 ° The inkjet recording method described.
<6> At least ink jetting means for applying a stimulus to the ink jet recording ink and causing the ink jet recording ink to fly to record an image on a recording medium;
The inkjet recording ink contains water, a water-soluble organic solvent, a colorant and a surfactant, and satisfies the following requirements (1) to (4):
(1) The dynamic surface tension (D ₁ ) at a surface lifetime of 15 ms or more and less than 100 ms according to the maximum bubble pressure method is 30.0 mN / m to 60.0 mN / m,
(2) The dynamic surface tension (D ₂ ) at a surface lifetime of 100 ms to 3,000 ms according to the maximum bubble pressure method is 27.0 mN / m to 35.0 mN / m,
(3) D ₁ ≧ D ₂ and
(4) The static surface tension is 27.0 mN / m or less,
The recording medium, at least one of and a recording layer provided on a surface, said recording layer is a cationic resin 1.0g ^/ m ² ~2.0g / m 2 containing the support and the support And a medium for concealing postcards, in which information is recorded on the surface of the recording layer, and then the surfaces of the recording layers are pasted together via an adhesive that can be peeled off, and conforms to JIS P8140 on the surface of the recording layer. an ink jet recording apparatus characterized by 10 seconds Cobb sizing degree is ^{10g / m 2 ~30g / m 2} .
<7> The inkjet recording apparatus according to <6>, wherein the stimulus is at least one of heat, pressure, vibration, and light.
<8> An ink recorded matter comprising an image formed on a recording medium using the inkjet recording method according to any one of <1> to <5>.

    1 Inkjet recording device

JP 2001-219680 A JP 2004-168793 A

Claims (8)

Including a flying step of applying a stimulus to the ink jet recording ink and causing the ink jet recording ink to fly to record an image on a recording medium,
The inkjet recording ink contains water, a water-soluble organic solvent, a colorant and a surfactant, and satisfies the following requirements (1) to (4):
(1) The dynamic surface tension (D ₁ ) at a surface lifetime of 15 ms or more and less than 100 ms according to the maximum bubble pressure method is 30.0 mN / m to 60.0 mN / m,
(2) The dynamic surface tension (D ₂ ) at a surface lifetime of 100 ms to 3,000 ms according to the maximum bubble pressure method is 27.0 mN / m to 35.0 mN / m,
(3) D ₁ ≧ D ₂ and
(4) The static surface tension is 27.0 mN / m or less,
The recording medium, at least one of and a recording layer provided on a surface, said recording layer is a cationic resin 1.0g ^/ m ² ~2.0g / m 2 containing the support and the support And a medium for concealing postcards, in which information is recorded on the surface of the recording layer, and then the surfaces of the recording layers are pasted together via an adhesive that can be peeled off, and conforms to JIS P8140 on the surface of the recording layer. the inkjet recording method characterized by 10 seconds Cobb sizing degree is ^{10g / m 2 ~30g / m 2} .   2. The ink jet recording method according to claim 1, wherein an ink set including at least four colors of black ink, cyan ink, magenta ink, and yellow ink is used as the ink for ink jet recording. The inkjet recording method according to claim 1, wherein the surfactant is at least one of the surfactants represented by the following general formulas (I) to (III).
_{C n F 2n + 1 -CH 2} CH (OH) CH 2 -O- (CH 2 CH 2 O) a -Y '
Formula (I)
In general formula (I), n represents an integer of 2 to 6, a represents an integer of 15 to 50, Y ′ represents —C _b H _{2b + 1} (b is an integer of 11 to 19) or —CH _{2. CH (OH) CH 2 -C d} F 2d + 1 (d is a is an integer from 2 to 6) represents a.
In general formula (II), R ¹ represents an alkylene group having 1 to 10 carbon atoms, R ² represents hydrogen or an alkyl group having 1 to 5 carbon atoms, m represents an integer of 0 to 10 and n represents 0. Represents an integer of -40, and a and b each represent an integer of 1-20.
In the general formula (III), R ³ may be the same or different from each other, and represents hydrogen, an alkyl group, or an acyl group, R ⁴ may be the same or different from each other, and —CF ₃ or —CF ₂ CF ₃ , n and p each represents an integer of 1 to 4, and m represents an integer of 1 to 25. In the recording medium, the transfer amount of pure water at the contacting time 100ms measured by a dynamic scanning liquid absorption ^meter, inkjet recording method according to any one of claims 1 to 3 is 2mL / ^{m 2} ~30mL / m 2 .   5. The ink jet recording method according to claim 1, wherein, in a recording medium, when a 5 μL droplet of ink jet recording ink is dropped on the surface, a contact angle at 100 ms after dropping is 16 ° to 32 °. At least ink jetting means for applying a stimulus to the ink jet recording ink and causing the ink jet recording ink to fly to record an image on a recording medium;
The inkjet recording ink contains water, a water-soluble organic solvent, a colorant and a surfactant, and satisfies the following requirements (1) to (4):
(1) The dynamic surface tension (D ₁ ) at a surface lifetime of 15 ms or more and less than 100 ms according to the maximum bubble pressure method is 30.0 mN / m to 60.0 mN / m,
(2) The dynamic surface tension (D ₂ ) at a surface lifetime of 100 ms to 3,000 ms according to the maximum bubble pressure method is 27.0 mN / m to 35.0 mN / m,
(3) D ₁ ≧ D ₂ and
(4) The static surface tension is 27.0 mN / m or less,
The recording medium, at least one of and a recording layer provided on a surface, said recording layer is a cationic resin 1.0g ^/ m ² ~2.0g / m 2 containing the support and the support And a medium for concealing postcards, in which information is recorded on the surface of the recording layer, and then the surfaces of the recording layers are pasted together via an adhesive that can be peeled off, and conforms to JIS P8140 on the surface of the recording layer. the ink jet recording apparatus characterized by 10 seconds Cobb sizing degree is ^{10g / m 2 ~30g / m 2} .   The inkjet recording apparatus according to claim 6, wherein the stimulus is at least one of heat, pressure, vibration, and light.   An ink recorded matter comprising an image formed on a recording medium using the ink jet recording method according to claim 1.