JP2003313462A - Ink for inkjet recording, ink set for inkjet recording, and inkjet recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink for inkjet recording, which can prevent the clogging of a nozzle and can form an inkjet image having high quality with controlled blurring, an ink set for inkjet recording, and an inkjet recording method using the ink or ink set for inkjet recording. <P>SOLUTION: The ink for inkjet recording contains a water-soluble dye, water, and a water-soluble organic solvent, wherein the content of the water-soluble organic solvent is 5-50 mass%, and tetraethylene glycol dimethyl ether accounts for 40-100 mass% of the water-soluble organic solvent. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inkjet recording ink, an inkjet recording ink set, and an inkjet recording method.

[0002]

2. Description of the Related Art Ink jet recording methods have been widely used as methods for easily obtaining high quality images, and high image quality has been advanced.

In the conventional ink for ink jet recording, the ink is apt to evaporate in the nozzle, whereby the coloring material is deposited and the nozzle is clogged, or the viscosity of the ink changes and the ejection becomes unstable. Had problems such as.

In order to solve these problems, there is known a technique in which a water-soluble organic solvent containing a large amount of glycerin or the like having a high boiling point is added to the ink to suppress the evaporation of the ink and prevent the nozzle from clogging. Has been.

[0005]

However, the conventional ink has a problem that bleeding easily occurs in the formed inkjet image. Bleeding is a phenomenon in which, when an inkjet image formed by inkjet recording is stored for a long period of time, the coloring material on the inkjet image diffuses due to the influence of humidity, temperature, etc., and the image bleeds.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent ink from clogging the nozzles and further prevent bleeding to form an ink jet image of high quality, and an ink jet recording ink. The present invention provides a recording ink set and an inkjet recording method using the inkjet recording ink or the inkjet recording ink set.

[0007]

The object of the present invention has been achieved by the following constitution.

1) In an ink jet recording ink containing a water-soluble dye, water and a water-soluble organic solvent, the content of the water-soluble organic solvent is 5 to 50% by mass, and tetraethylene glycol occupies the water-soluble organic solvent. An ink jet recording ink, wherein the ratio of dimethyl ether is 40 to 100% by mass.

2) In an ink jet recording ink containing a water-soluble dye, water and a water-soluble organic solvent, the content of the water-soluble organic solvent is 5 to 50% by mass, and tetraethylene glycol dimethyl ether is used as the water-soluble organic solvent. And an ethylene glycol and / or diethylene glycol.

3) The total content of the tetraethylene glycol dimethyl ether and further the ethylene glycol and / or the diethylene glycol in the water-soluble organic solvent is 50 to 100% by mass. Ink for inkjet recording.

4) The above 1) characterized in that the proportion of glycerin in the water-soluble organic solvent is 25% by mass or less.
~ 3) The ink for inkjet recording according to any one of 3).

5) In an ink jet recording ink set having at least a yellow ink jet recording ink, a magenta ink jet recording ink, a cyan ink jet recording ink, and a black ink jet recording ink, all of the ink jet recording inks described above. An ink set for inkjet recording, which is the ink for inkjet recording according to any one of 1) to 4).

6) An ink jet recording method according to any one of 1) to 4) above, wherein the ink is recorded on a recording medium having an ink receiving layer containing a water-soluble binder. Alternatively, it is the ink set for ink jet recording according to the above 5, which is an ink jet recording method.

7) The ink jet recording method as described in 6) above, wherein the ink receiving layer has a porous structure.

8) The ink jet recording method according to 6) or 7), wherein a fixing process is performed on the recorded recording medium.

9) The ink jet recording method according to any one of 6) to 8), wherein the recording is performed by an on-demand method.

10) Recording is performed by ejecting the ink by an electromechanical conversion method.
9. The inkjet recording method according to any one of 9).

11) The recording is performed by ejecting the ink by an electric / heat conversion system.
The inkjet recording method according to any one of 1.

As a result of intensive studies by the present inventors, in an ink jet recording ink containing a water-soluble dye, water, and a water-soluble organic solvent, the water-soluble organic solvent in the ink was set to 5 to 50% by mass, and further water-soluble. 40 to 10 of organic solvent
It has been found that the inkjet recording ink in which 0% by mass is tetraethylene glycol dimethyl ether has suppressed nozzle clogging, and an inkjet image formed using this ink has suppressed bleeding.

Further, in the ink for ink jet recording containing a water-soluble dye, water and a water-soluble organic solvent, the present inventors occupy 5 to 50% by mass of the water-soluble organic solvent in the ink.
The ink for inkjet recording containing tetraethylene glycol dimethyl ether, and at least one of ethylene glycol and diethylene glycol is capable of suppressing clogging of nozzles, and an ink jet image formed by using this ink has suppressed bleeding. Also found.

The ink jet recording ink of the present invention comprises
The water-soluble organic solvent in the ink is 5 to 50% by mass, and 40 to 100% by mass of the water-soluble organic solvent is tetraethylene glycol dimethyl ether which is a high-boiling water-soluble organic solvent. Therefore, the occurrence of nozzle clogging can be suppressed.

The ink jet recording ink of the present invention contains the water-soluble organic solvent in the ink in an amount of 5 to 50% by mass.
In addition, since the water-soluble organic solvent further contains tetraethylene glycol dimethyl ether and further contains at least one of diethylene glycol and ethylene glycol, the evaporation of ink is suppressed and the occurrence of nozzle clogging can be suppressed.

The ink jet recording ink of the present invention comprises
The proportion of tetraethylene glycol dimethyl ether in the water-soluble organic solvent is preferably 50 to 100% by mass. As a result, bleeding can be further suppressed, and nozzle clogging can be further suppressed.

The ink jet recording ink of the present invention comprises
The total ratio of at least one of tetraethylene glycol dimethyl ether and ethylene glycol or diethylene glycol in the water-soluble organic solvent is 50 to 100.
It is also preferable that the content is% by mass, since bleeding can be further suppressed and nozzle clogging can be further suppressed.

The ink jet recording ink of the present invention comprises
The proportion of glycerin in the water-soluble organic solvent is 25% by mass
The following is preferable, and it is most preferable that glycerin is not contained in the water-soluble organic solvent. This can further suppress bleeding.

The water-soluble organic solvent in the present invention means alcohols (for example, methanol, ethanol, propanol, isopropanol, butanol, isobutanol, secondary butanol, tertiary butanol, pentanol, hexanol, cyclohexanol, benzyl alcohol, etc.). , Polyhydric alcohols (for example, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, butylene glycol, hexanediol, pentanediol, glycerin, hexanetriol, thiodiene Glycol, etc.), polyhydric alcohol ethers (eg ethylene glycol monomethyl ether) Ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monophenyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, propylene glycol monomethyl ether, propylene glycol monobutyl ether, ethylene glycol monomethyl ether acetate, tri Ethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, triethylene glycol dimethyl ether, dipropylene glycol monopropyl ether, tripropylene glycol dimethyl ether, etc.), amine (E.g., ethanolamine, diethanolamine, triethanolamine, N- methyldiethanolamine, N-
Ethyldiethanolamine, morpholine, N-ethylmorpholine, ethylenediamine, diethylenediamine, triethylenetetramine, tetraethylenepentamine, polyethyleneimine, pentamethyldiethylenetriamine, tetramethylpropylenediamine, etc., amides (eg formamide, N, N-dimethyl) Formamide, N, N-dimethylacetamide, etc.), heterocycles (eg, 2-pyrrolidone, N-methyl-2-pyrrolidone,
N-cyclohexyl-2-pyrrolidone, 2-oxazolidone, 1,3-dimethyl-2-imidazolidinone, etc.),
Sulfoxides (eg, dimethyl sulfoxide, etc.),
Examples thereof include sulfones (eg, sulfolane).

The water-soluble organic solvent used in the ink jet recording ink of the present invention preferably has a high boiling point in order to further suppress nozzle clogging.

Examples of water-soluble dyes that can be used in the present invention include azo dyes, methine dyes, azomethine dyes, xanthene dyes, quinone dyes, phthalocyanine dyes, triphenylmethane dyes and diphenylmethane dyes. Specific compounds are shown below.
However, the compounds are not limited to these exemplified compounds.

[C. I. Acid Yellow] 1, 3, 1
1, 17, 18, 19, 23, 25, 36, 38, 4
0, 42, 44, 49, 59, 61, 65, 67, 7
2, 73, 79, 99, 104, 110, 114, 11
6, 118, 121, 127, 129, 135, 13
7, 141, 143, 151, 155, 158, 15
9, 169, 176, 184, 193, 200, 20
4, 207, 215, 219, 220, 230, 23
2, 235, 241, 242, 246 [C. I. Acid Orange] 3, 7, 8, 10, 1
9, 24, 51, 56, 67, 74, 80, 86, 8
7, 88, 89, 94, 95, 107, 108, 11
6, 122, 127, 140, 142, 144, 14
9, 152, 156, 162, 166, 168 [C. I. Acid Red] 88, 97, 106, 11
1, 114, 118, 119, 127, 131, 13
8, 143, 145, 151, 183, 195, 19
8, 211, 215, 217, 225, 226, 24
9, 251, 254, 256, 257, 260, 26
1, 265, 266, 274, 276, 277, 28
9, 296, 299, 315, 318, 336, 33
7, 357, 359, 361, 362, 364, 36
6, 399, 407, 415 [C. I. Acid Violet] 17, 19, 21,
42, 43, 47, 48, 49, 54, 66, 78, 9
0, 97, 102, 109, 126 [C. I. Acid Blue] 1, 7, 9, 15, 23,
25, 40, 62, 72, 74, 80, 83, 90, 9
2, 103, 104, 112, 113, 114, 12
0, 127, 128, 129, 138, 140, 14
2, 156, 158, 171, 182, 185, 19
3, 199, 201, 203, 204, 205, 20
7,209,220,221,224,225,22
9, 230, 239, 249, 258, 260, 26
4, 278, 279, 280, 284, 290, 29
6, 298, 300, 317, 324, 333, 33
5, 338, 342, 350 [C. I. Acid Green] 9, 12, 16, 19,
20, 25, 27, 28, 40, 43, 56, 73, 8
1, 84, 104, 108, 109 [C. I. Acid Brown] 2, 4, 13, 14, 1
9, 28, 44, 123, 224, 226, 227, 2
48, 282, 283, 289, 294, 297, 29
8, 301, 355, 357, 413 [C. I. Acid Black] 1, 2, 3, 24, 2
6, 31, 50, 52, 58, 60, 63, 107, 1
09, 112, 119, 132, 140, 155, 17
2, 187, 188, 194, 207, 222 [C. I. Direct Yellow] 8, 9, 10, 11,
12, 22, 27, 28, 39, 44, 50, 58, 7
9, 86, 87, 98, 105, 106, 130, 13
2, 137, 142, 147, 153 [C. I. Direct Orange] 6, 26, 27, 3
4, 39, 40, 46, 102, 105, 107, 11
8 [C. I. Direct Red] 2, 4, 9, 23, 2
4, 31, 54, 62, 69, 79, 80, 81, 8
3, 84, 89, 95, 212, 224, 225, 22
6, 227, 239, 242, 243, 254 [C. I. Direct Violet] 9, 35, 51,
66, 94, 95 [C. I. Direct Blue] 1, 15, 71, 76,
77, 78, 80, 86, 87, 90, 98, 106,
108, 160, 168, 189, 192, 193, 1
99, 200, 201, 202, 203, 218, 22
5,229,237,244,248,251,27
0, 273, 274, 290, 291 [C. I. Direct Green] 26, 28, 59, 8
0,85 [C. I. Direct Brown] 44, 106, 11
5, 195, 209, 210, 222, 223 [C. I. Direct Black] 17, 19, 22, 3
2, 51, 62, 108, 112, 113, 117, 1
18, 132, 146, 154, 159, 169 [C. I. Basic Yellow] 1, 2, 11, 13,
15, 19, 21, 28, 29, 32, 36, 40, 4
1, 45, 51, 63, 67, 70, 73, 91 [C. I. Basic orange] 2, 21, 22 [C. I. Basic Red] 1, 2, 12, 13, 1
4, 15, 18, 23, 24, 27, 29, 35, 3
6, 39, 46, 51, 52, 69, 70, 73, 8
2, 109 [C. I. Basic Violet] 1, 3, 7, 1
0, 11, 15, 16, 21, 27, 39 [C. I. Basic blue] 1, 3, 7, 9, 21,
22, 26, 41, 45, 47, 52, 54, 65, 6
9, 75, 77, 92, 100, 105, 117, 12
4, 129, 147, 151 [C. I. Basic green] 1, 4 [C. I. Basic Brown] 1 [C. I. Reactive Yellow] 2, 3, 7, 15,
17, 18, 22, 23, 24, 25, 27, 37, 3
9, 42, 57, 69, 76, 81, 84, 85, 8
6, 87, 92, 95, 102, 105, 111, 12
5, 135, 136, 137, 142, 143, 14
5, 151, 160, 161, 165, 167, 16
8, 175, 176 [C. I. Reactive orange] 1, 4, 5, 7, 1
1, 12, 13, 15, 16, 20, 30, 35, 5
6, 64, 67, 69, 70, 72, 74, 82, 8
4, 86, 87, 91, 92, 93, 95, 107 [C. I. Reactive Red] 2, 3, 5, 8, 1
1, 21, 22, 23, 24, 28, 29, 31, 3
3, 35, 43, 45, 49, 55, 56, 58, 6
5, 66, 78, 83, 84, 106, 111, 11
2, 113, 114, 116, 120, 123, 12
4, 128, 130, 136, 141, 147, 15
8, 159, 171, 174, 180, 183, 18
4, 187, 190, 193, 194, 195, 19
8, 218, 220, 222, 223, 228, 235 [C. I. Reactive Violet] 1, 2, 4,
5, 6, 22, 23, 33, 36, 38 [C. I. Reactive blue] 2, 3, 4, 5, 7,
13, 14, 15, 19, 21, 25, 27, 28, 2
9, 38, 39, 41, 49, 50, 52, 63, 6
9, 71, 72, 77, 79, 89, 104, 109,
112, 113, 114, 116, 119, 120, 1
22, 137, 140, 143, 147, 160, 16
1, 162, 163, 168, 171, 176, 18
2, 184, 191, 194, 195, 198, 20
3, 204, 207, 209, 211, 214, 22
0, 221, 222, 231, 235, 236 [C. I. Reactive Green] 8, 12, 15, 1
9, 21 [C. I. Reactive Brown] 2, 7, 9, 10,
11, 17, 18, 19, 21, 23, 31, 37, 4
3, 46 [C. I. Reactive Black] 5, 8, 13, 1
4, 31, 34, 39 [C. I. Food Black] 1, 2 Examples include compounds represented by the general formula (1) and compounds represented by the general formula (2).

[0030]

[Chemical 1]

[0031]

[Chemical 2]

The dyes listed above are described in "Dyeing Note 21st Edition" (published by Shikiso Co., Ltd.) and the like.

In the present invention, C.I. I.
Direct Yellow 132, a compound represented by the general formula (1) as a magenta dye, a compound represented by the general formula (2), and a cyan dye such as C.I. I. Direct Blue 199, C.I. as a black dye. I. It is preferable to use Food Black 2. The light resistance of the inkjet image thus formed can be improved, and the quality of the inkjet image can be improved.

The compound represented by the general formula (1) will be described. In the formula, R ₁ represents a hydrogen atom or a substitutable substituent, preferably a hydrogen atom or a phenylcarbonyl group. R ₂ may be different and represents a hydrogen atom or a substitutable substituent, preferably a hydrogen atom. R ₃ represents a hydrogen atom or a substitutable substituent, preferably a hydrogen atom or an alkyl group. R ₄ represents a hydrogen atom or a substitutable substituent, preferably a hydrogen atom or an aryloxy group. R ₅ may be different and represents a hydrogen atom or a substitutable substituent, and a sulfonic acid group is preferable. n represents an integer of 1 to 4. m represents an integer of 1 to 5.

The compound represented by the general formula (2) will be described. In the formula, X represents a phenyl group or a naphthyl group, which may be substituted with a substitutable substituent, and is preferably substituted with a sulfonic acid group or a carboxyl group. Y represents a hydrogen ion, a sodium ion, a potassium ion, a lithium ion, an ammonium ion, or an alkylammonium ion. R ₆ may be different and represents a hydrogen atom or a substituent capable of substituting on the naphthalene ring. q represents an integer of 1 or 2. p represents an integer of 1 to 4. q
+ P = 5. Z represents a substitutable substituent, represents a carbonyl group, a sulfonyl group or a group represented by the general formula (3), and a group represented by the general formula (3) is preferable.

[0036]

[Chemical 3]

In the formula (3), W ₁ and W ₂ may represent different halogen atoms, amino groups, hydroxyl groups, alkylamino groups and arylamino groups, and halogen atoms, hydroxyl groups or alkylamino groups. Is preferred.

In the present invention, among the compounds represented by the general formula (1), the following compounds are particularly preferably used, and the light resistance of the ink jet image formed thereby can be further improved, and the ink jet The image quality can be improved.

[0039]

[Chemical 4]

In the present invention, it is preferable to use the following compounds among the compounds represented by the general formula (2), which can further improve the light resistance of an ink jet image formed.

[0041]

[Chemical 5]

[0042]

[Chemical 6]

The dye represented by the general formula (1) may be used alone or in combination with a plurality of dyes.
The dye having a different structure represented by or the dye represented by the general formula (2) may be used in combination.

The ink jet recording ink of the present invention comprises
The content of the water-soluble dye can be selected in the range of 0.1 to 20% by mass, and in order to form a photographic image with an inkjet image, a so-called dark and light ink in which the content of the water-soluble dye is changed is used. It is preferably prepared and used. Also,
If necessary, it is also preferable in terms of color reproduction that special color inks such as red, green and blue are used.

The ink jet recording ink set in the present invention is an ink jet recording ink set having at least a yellow ink jet recording ink, a magenta ink jet recording ink, a cyan ink jet recording ink, and a black ink jet recording ink. , Refers to an ink set that includes a plurality of inks that are generally used for so-called color inkjet printing.

In the ink jet recording ink set of the present invention, all the ink jet recording inks of the ink jet recording ink set are the ink jet recording ink of the present invention, and when an ink jet image is formed using this ink set, bleeding occurs. Can be suppressed.

The ink jet recording method of the present invention is an ink jet recording in which the ink for ink jet recording of the present invention or the ink set for ink jet recording of the present invention is used for recording on a recording medium having an ink receiving layer containing a water-soluble binder. Ink jet images formed by this recording method are suppressed in bleeding.

The ink receiving layer of the recording medium used in the present invention includes a void type image receiving layer having voids and a so-called swelling type image receiving layer having no voids. In the case of the swelling type image receiving layer, the ink receiving layer is made of a water absorbing resin, and the water absorbing resin absorbs the ink solvent and the dye by incorporating them between the molecules of the resin. Such an ink receiving layer is preferable in that it is more advantageous than the void type because the dye does not come into direct contact with air for fading of the image.

The water-absorbent resin is, for example, polyvinyl alcohol, gelatin, polyethylene oxide, polyvinylpyrrolidone, casein, starch, agar, carrageenan,
Polyacrylic acid, polymethacrylic acid, polyacrylamide, polymethacrylamide, polystyrene sulfonic acid,
Hydrophilic polymers such as cellulose, hydroxylethyl cellulose, carboxymethyl cellulose, hydroxylethyl cellulose, dextran, dextrin, pullulan, and water-soluble polyvinyl butyral can be mentioned.
These hydrophilic polymers can be used in combination of two or more. The hydrophilic polymer preferably used in the present invention is polyvinyl alcohol.

The ink receiving layer preferably contains a curing agent and a surfactant in addition to the hydrophilic binder. To prevent blocking, a filler such as a matting agent can be added to the extent that voids are not generated.

On the other hand, the use of the void type ink receiving layer is preferable in that the color bleeding can be further improved.
The void-type ink receiving layer of the recording medium used in the present invention is
It is preferably formed mainly of fine particles and a hydrophilic binder.

As the fine particles that can be used in the present invention, inorganic fine particles and organic fine particles can be used.
In particular, inorganic fine particles are preferable because they have high gloss and high color density and can easily obtain fine particles. Examples of such inorganic fine particles include light calcium carbonate, heavy calcium carbonate, magnesium carbonate, kaolin, clay, talc, calcium sulfate, barium sulfate,
Titanium dioxide, zinc oxide, zinc hydroxide, zinc sulfide, zinc carbonate, hydrotalcite, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic amorphous silica, colloidal silica, alumina, colloidal alumina, pseudoboehmite, water Aluminum oxide, lithopone,
Examples thereof include white inorganic pigments such as zeolite and magnesium hydroxide. The above-mentioned inorganic fine particles can be used as primary particles as they are, or can be used in a state of forming secondary aggregated particles.

In the present invention, it is preferable to use alumina, pseudo-boehmite, colloidal silica or fine particle silica synthesized by a vapor phase method as the inorganic fine particles from the viewpoint of obtaining high quality prints on the ink jet recording medium.

Of these, pseudo-boehmite alumina hydrate is preferable from the viewpoint of preventing bleeding of a printed image in a high humidity environment. As a typical example of this pseudo-boehmite, Japanese Patent Laid-Open No. 7-8
Alumina Hydrate A described in the example of No. 9221 may be mentioned. This alumina hydrate A was first produced into aluminum alkoxide by the method described in U.S. Pat. No. 4,242,271.
The aluminum alkoxide is hydrolyzed by the method described in No. 0 and aged at 30 ° C. for 2 hours in an oven to obtain a colloidal sol of alumina. This alumina hydrate A is amorphous and has a flat plate shape, and has a BET specific surface area of 7
6 g / m, BET pore volume 0.57 ml / g.

The reason why such pseudo-boehmite has a high ink receptivity is considered to be the fact that its pore radius and pore size distribution are in a range very suitable for ink receptivity. The pore size distribution of pseudo-boehmite has two or more maximums. The relatively large pores absorb the solvent component in the ink, and the relatively small pores adsorb the dye in the ink. One of the maximum pore size distributions of pseudo-boehmite has a pore radius of preferably 10 nm or less, more preferably 1 to 6 nm. The other maximum preferably has a pore radius of 10 to 20 nm.

In the present invention, the most preferable of the above-mentioned inorganic fine particles is fine particle silica synthesized by a gas phase method. It is preferable in terms of color bleed, gloss, image density, and cost. The silica synthesized by this vapor phase method may have a surface modified with Al. The Al content of the vapor grown silica whose surface is modified with Al is preferably 0.05 to 5% by mass with respect to silica.

The inorganic fine particles may have any particle diameter, but the average particle diameter is preferably 1 μm or less. If it is 1 μm or less, the glossiness and color developability are better, and therefore, in particular, 0.2 μm
The following is preferable, and 0.1 μm or less is most preferable. The lower limit of the particle size is not particularly limited, but from the viewpoint of manufacturing the inorganic fine particles, it is generally 0.003 μm or more, and particularly 0.005 μm.
The above is preferable.

The average particle size of the inorganic fine particles is obtained by observing the cross section and the surface of the void-type ink receiving layer with an electron microscope to obtain the particle size of 100 arbitrary particles, and taking the simple average value (number average) as the average value. Desired. Here, each grain size is represented by a diameter assuming a circle having the same projected area.

The dispersity of the fine particles is preferably 0.5 or less from the viewpoint of glossiness and color development. When it is 0.5 or less, gloss and color developability at the time of printing are better. Particularly, 0.3 or less is preferable. Here, the dispersity of the fine particles is represented by a value obtained by observing the fine particles in the void-type ink receiving layer with an electron microscope and determining the standard deviation by the average particle diameter. .

The fine particles may be primary particles as they are or may be present in the porous film as secondary particles or higher-order aggregated particles, but the average particle diameter is observed by an electron microscope. The particle size of the independent particles that are formed in the void-type ink receiving layer.

The content of the above fine particles in the water-soluble coating liquid is 5 to 40% by mass, and particularly preferably 7 to 30% by mass.

The water-soluble binder contained in the void-type ink receiving layer is not particularly limited, and conventionally known water-soluble binders can be used, for example, gelatin, polyvinylpyrrolidone, polyethylene oxide, polyacrylamide, polyvinyl alcohol and the like. Can be used, but polyvinyl alcohol is particularly preferable.

Polyvinyl alcohol is a polymer which has an interaction with inorganic fine particles, has a particularly high holding power for inorganic fine particles, and has a relatively small humidity dependency of hygroscopicity. Is relatively small, the suitability for cracking during coating and drying, which is the subject of the present invention, is excellent. As the polyvinyl alcohol preferably used in the present invention, in addition to ordinary polyvinyl alcohol obtained by hydrolyzing polyvinyl acetate, modified polyvinyl alcohol having a cation-modified terminal or anion-modified polyvinyl alcohol having an anionic group, etc. Polyvinyl alcohol is also included.

The polyvinyl alcohol obtained by hydrolyzing vinyl acetate preferably has an average degree of polymerization of 300 or more, and particularly has an average degree of polymerization of 1,000 to 5,000.
Those of are preferably used. Degree of saponification is 70 to 10
0% is preferable, and 80 to 99.5% is particularly preferable.

As the cation-modified polyvinyl alcohol, for example, a primary to tertiary amino group or a quaternary ammonium group as described in JP-A-61-10483 can be used in the main chain or side chain of the polyvinyl alcohol. Which are obtained by saponifying a copolymer of an ethylenically unsaturated monomer having a cationic group and vinyl acetate.

Examples of the ethylenically unsaturated monomer having a cationic group include trimethyl- (2-acrylamido-2,2-dimethylethyl) ammonium chloride and trimethyl- (3-acrylamido-3,3-dimethylpropyl). Ammonium chloride, N-vinyl imidazole, N-vinyl-2-methyl imidazole, N
-(3-dimethylaminopropyl) methacrylamide,
Hydroxylethyltrimethylammonium chloride, trimethyl- (methacrylamidopropyl) ammonium chloride, N- (1,1-dimethyl-3-dimethylaminopropyl) acrylamide and the like can be mentioned.

The ratio of the cation-modified group-containing monomer of the cation-modified polyvinyl alcohol is 0.1 to 10 mol%, preferably 0.2 to 5 mol% with respect to vinyl acetate.

Polyvinyl alcohol may be used in combination of two or more types such as different degree of polymerization and different types of modification. In particular, when polyvinyl alcohol having a degree of polymerization of 2000 or more is used, the degree of polymerization is set in advance in the inorganic fine particle dispersion liquid.
5,000 or less polyvinyl alcohol is 0.05 to 10% by mass, preferably 0.1 to 5% by mass with respect to the inorganic fine particles.
It is preferable to add polyvinyl alcohol having a degree of polymerization of 2000 or more after the addition because there is no significant increase in viscosity.

The ratio of the fine particles to the water-soluble binder in the void type ink receiving layer is preferably 2 to 20 times by mass. If the mass ratio is less than 2 times, not only the void ratio of the void-type ink receiving layer is lowered and it becomes difficult to obtain a sufficient void volume, but also an excessive amount of the water-soluble binder swells during inkjet recording to form voids. It becomes a factor to block the ink absorption speed. On the other hand, if this ratio exceeds 20 times, cracking tends to occur when the void-type ink receiving layer is applied as a thick film, which is not preferable. Particularly preferred ratio of fine particles to water-soluble binder is 2.5.
˜12 times, most preferably 3 to 10 times.

It is preferable to add a compound containing a zirconium atom or an aluminum atom in the molecule to the void-type ink receiving layer using the vapor-phase method silica in that color bleeding and bleeding are improved.

The compound having a zirconium atom in the molecule which can be used in the recording medium used in the present invention does not include zirconium oxide. Specific examples thereof include zirconium difluoride, zirconium trifluoride and zirconium tetrafluoride. , Hexafluorozirconate (eg, potassium salt), heptafluorozirconate (eg, sodium salt, potassium salt), heptafluorozirconate (eg, sodium salt, potassium salt, ammonium salt), octafluorozirconate salt (Eg lithium salt), zirconium fluoride oxide, zirconium dichloride, zirconium trichloride, zirconium tetrachloride, hexachlorozirconate (eg sodium salt, potassium salt), zirconium trichloride, zirconium dibromide, tribromide Jill Bromide, tetrabromide zirconium,
Zirconium bromide oxide, zirconium triiodide, zirconium tetraiodide, zirconium peroxide, zirconium hydroxide, zirconium sulfate, zirconium p-toluenesulfonate, zirconyl sulfate, sodium zirconyl sulfate, acidic zirconyl sulfate trihydrate, zirconium sulfate Potassium, zirconium selenate, zirconium nitrate, zirconyl nitrate, zirconium phosphate, zirconyl carbonate,
Zirconyl ammonium carbonate, zirconium acetate, zirconyl acetate, zirconyl ammonium acetate, zirconyl lactate, zirconyl citrate, zirconyl stearate,
Zirconium phosphate, zirconyl phosphate, zirconium phosphate, zirconium isopropylate, zirconium butyrate, zirconium acetylacetonate, zirconium acetate, bis (acetylacetonato) dichlorozirconium, tris (acetylacetonate)
Examples thereof include chlorozirconium.

Among these compounds, zirconyl carbonate, zirconyl ammonium carbonate, zirconyl acetate, zirconyl nitrate, zirconium trichloride, zirconyl lactate,
Zirconyl citrate is preferred, with ammonium zirconyl carbonate and zirconyl acetate being most preferred.

The compound containing an aluminum atom in the molecule which can be used in the present invention does not include aluminum oxide, and specific examples thereof include aluminum fluoride, hexafluoroaluminic acid (eg potassium salt), aluminum chloride, Basic aluminum chloride (eg, polyaluminum chloride), tetrachloroaluminate (eg,
Sodium salt), aluminum bromide, tetrabromoaluminate (eg potassium salt), aluminum iodide, aluminate (eg sodium salt, potassium salt, calcium salt), aluminum chlorate, aluminum perchlorate, thiocyan Aluminum acid sulfate, aluminum sulfate, basic aluminum sulfate, aluminum potassium sulfate (alum), ammonium aluminum sulfate (ammonium alum), sodium aluminum sulfate, aluminum phosphate, aluminum nitrate, aluminum hydrogen phosphate, aluminum carbonate, aluminum polysulfate silicate, aluminum formate, Aluminum acetate, aluminum lactate, aluminum oxalate, aluminum isopropylate, aluminum butyrate, ethyl acetate aluminum diisopropylate Rate, aluminum tris (acetylacetonate), aluminum tris (ethylacetoacetate), aluminum monoacetylacetonate bis (ethyl acetoacetonate) and the like.

Among these, aluminum chloride, basic aluminum chloride, aluminum sulfate, basic aluminum sulfate and basic aluminum sulfate silicate are preferable,
Most preferred are basic aluminum chloride and basic aluminum sulfate.

The above compound was used as an ink jet recording paper 1.
Per m ² , usually 0.05 to 25 mmol, preferably 0.25 to 10 mmol, particularly preferably 0.5 to 5 m
Used in the mol range.

In the void type ink receiving layer using silica, it is preferable to add a silane coupling agent because it has an effect of reducing color bleed.

The silane coupling agent is preferably a compound having a quaternary ammonium salt and a di- or trialkoxysilanyl group. Examples of preferable silane coupling agents include (a) 3- (trimethoxysilyl) propyldimethyloctadecyl ammonium chloride,
(B) N-β- (N-vinylbenzylaminoethyl)-
γ-aminopropyltrimethoxysilane, (C) 3-
Examples thereof include (trimethoxysilyl) propyldimethylhydroxyethylammonium chloride and a silane coupling agent having a (d) imidazole group. These chemical formulas are shown below.

[0078]

[Chemical 7]

The curing of the silane coupling agent is carried out by converting a plurality of alkoxysilanyl groups into silanol groups in the presence of water (which can be caused by moisture in the air), so that the silane coupling agents can react with each other (preferably by heating. ) It is carried out by binding by a condensation reaction between silanol groups to form a crosslinked structure.

When these cationic substances are added to the coating liquid for the transparent porous layer, they may interact with the anionic charge on the surface of the inorganic fine particles such as silica to cause aggregation, but they are contained in the coating liquid for the cross-linking agent. In that case, there is no problem, and an effective amount can be added to improve the film quality of the transparent porous layer. The addition amount of the cationic substance is 0.0
It is preferably ¹ to 3.6 g / m ² , and 0.05 to
More preferably, it is about 2 g / m ² .

As the support used for the recording medium that can be used in the present invention, a water-absorbent support (for example, paper) or a non-water-absorbent support can be used, but a higher quality print can be obtained. From the viewpoint of the above, a non-water absorbent support is preferred.

In the water-absorbent support, not only it is difficult to obtain high-quality prints, but also each overcoated additive component diffuses in the paper after coating, resulting in impairing the original effect of the additive.

As the non-water-absorbing support which is preferably used, for example, polyester film, diacetate film, triate sate film, polyolefin film, acrylic film, polycarbonate film, polyvinyl chloride film, polyimide film, A transparent or opaque film made of a material such as cellophane or celluloid, or resin-coated paper in which both surfaces of a base paper are coated with a polyolefin resin coating layer, so-called RC paper or the like is used.

Various additives can be added to the water-soluble coating liquid for forming the void type ink receiving layer.
Examples of such additives include cationic mordants,
Cross-linking agent, surfactant (cation, nonion, anion,
Amphoteric), white background color adjusting agent, fluorescent whitening agent, antifungal agent, viscosity adjusting agent, low boiling organic solvent, high boiling organic solvent, latex emulsion, anti-fading agent, ultraviolet absorber, polyvalent metal compound (water-soluble or Water-insoluble), a matting agent, silicone oil, and the like. Among them, a cationic mordant is preferable in order to improve water resistance and moisture resistance after printing.

As the cation mordant, a polymer mordant having a primary to tertiary amino group and a quaternary ammonium salt group is used. However, since it is less likely to undergo discoloration or deterioration of light resistance during long-term storage, Polymer mordants having a quaternary ammonium salt group are preferred.

The preferred polymer mordant is obtained as a homopolymer of the above-mentioned monomer having a quaternary ammonium salt group, a copolymer with other monomer or a condensation polymer.

It is also particularly preferable to include a crosslinking agent for the water-soluble binder. The cross-linking agent improves the water resistance of the void-type ink receiving layer, and suppresses the swelling of the water-soluble binder during inkjet recording, thereby improving the ink absorption rate.

As the cross-linking agent, a conventionally known cross-linking agent can be used, and an inorganic cross-linking agent (eg, chromium compound, aluminum compound, zirconium compound, boric acid, etc.) or organic cross-linking agent (eg, epoxy-based cross-linking agent). Cross-linking agent,
Isocyanate crosslinking agent, aldehyde crosslinking agent, N-methylol crosslinking agent, acryloyl crosslinking agent, vinylsulfone crosslinking agent, active halogen crosslinking agent, carbodiimide crosslinking agent, ethyleneimino crosslinking agent, etc.) are used. be able to.

These cross-linking agents are contained in the water-soluble binder in an amount of generally 1 to 50% by mass, preferably 2 to 40%.
It is% by mass.

When the water-soluble binder is polyvinyl alcohol and the fine particles are silica, the crosslinking agent is preferably an inorganic crosslinking agent such as boric acid or a zirconium compound and an epoxy crosslinking agent.

The coating method that can be used in the preparation of the recording medium that can be used in the present invention can be appropriately selected from known methods, for example, gravure coating method, roll coating method, rod bar coating method. An air knife coating method, a spray coating method, an extrusion coating method, a curtain coating method or an extrusion coating method using a hopper described in US Pat. No. 2,681,294 is preferably used.

The void-type ink receiving layer of the recording medium that can be used in the present invention may be a single layer or a multi-layer. In the case of a multi-layer structure, it is necessary to apply all layers at the same time. It is preferable from the viewpoint of manufacturing cost reduction.

The ink jet recording method of the present invention is preferably an on-demand method. In the ink jet recording method of the present invention, it is preferable to perform fixing processing after recording with ink on a recording medium.

In the present invention, the fixing method means (1) a method of closing the voids on the surface by heating after recording with an ink jet on a recording medium containing thermoplastic fine particles on the surface of the void type ink receiving layer, A method of forming a transparent protective layer (overcoat layer) on the surface of the ink receiving layer by thermal transfer after recording on the recording medium by inkjet, (3) forming a resin layer by coating on the surface of the ink receiving layer after recording on the recording medium by inkjet Methods and the like. In either method, it is preferable to evaporate the solvent as much as possible by heating after recording and then perform fixing in order to further suppress the bleeding.

(1), (2) and (3) will be described in detail below. It is preferable that the surface layer of the recording medium containing the thermoplastic fine particles on the surface of the void type ink receiving layer (1) contains the inorganic pigment and the thermoplastic fine particles. The light resistance or water resistance of the recording medium is improved depending on the presence or absence of heat treatment after image recording.

Examples of the thermoplastic fine particles which can be used in the fixing treatment include polycarbonate, polyacrylonitrile, polystyrene, polyacrylic acid, polymethacrylic acid, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyester, polyamide, Examples thereof include polyethers, copolymers thereof and salts thereof. Among them, styrene-acrylic acid ester copolymer, vinyl chloride-vinyl acetate copolymer, vinyl chloride-acrylic acid ester copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid ester copolymer, SBR latex preferable. Further, the thermoplastic fine particles may be a mixture of a plurality of polymers having different monomer compositions, particle sizes, and degrees of polymerization.

In selecting the thermoplastic fine particles, consideration should be given to ink receptivity, image glossiness after fixing by heating and pressurization, image fastness and releasability.

The thermoplastic fine particle size is preferably 0.
The thickness is from 05 to 10 μm, more preferably from 0.1 to 5 μm. More preferably, it is 0.1 to 1 μm.

The glass transition point (Tg) can be mentioned as a criterion for selecting the thermoplastic fine particles. When Tg is lower than the coating drying temperature, for example, the coating drying temperature at the time of manufacturing the recording medium is already higher than Tg and the ink solvent permeates, so that the voids due to the thermoplastic fine particles disappear. The Tg of the thermoplastic fine particles is preferably 50 to 150 ° C. from the viewpoint of the load on the device and the thermal stability of the support.

As the minimum film forming temperature (MFT),
It is preferably 50 to 150 ° C. The thermoplastic particles are
From the viewpoint of environmental suitability, those dispersed in an aqueous system are preferred, and an aqueous latex obtained by emulsion polymerization is particularly preferred. At this time, the type obtained by emulsion polymerization using a nonionic dispersant as an emulsifier is a form that can be preferably used. From the viewpoint of odor and safety, the thermoplastic fine particles to be used preferably have a small amount of residual monomer components, preferably 3% by mass or less, more preferably 1% by mass or less, based on the solid content of the polymer. It is preferably 0.1% by mass or less.

The surface layer containing the inorganic pigment and the thermoplastic fine particles has a solid content of 2 to 50 g /
The range of m ² is preferable, and the range of 3 to 30 g / m ² is more preferable.

[0102] recording medium used in the present invention the ink jet recording method, the solid content of the thermoplastic fine particles contained in the surface layer, preferably in the range of 0.5 to 15 g / m ^2, the range of 1 to 7 g / m ² Is particularly preferable. If the solid content of the thermoplastic fine particles is too small, a sufficient film cannot be formed and the pigment cannot be sufficiently dispersed in the film. Therefore, the image quality, gloss, and light resistance are not sufficiently improved. On the other hand, if the solid content of the thermoplastic fine particles is too large, the thermoplastic fine particles cannot be completely formed into a film by a heating process in a short time, and the fine particles remain as opaqueness to deteriorate the image quality.
In addition, the ink absorption speed is also reduced, causing bleeding at the boundary, which is a problem.

The surface layer coating liquid containing the inorganic pigment and the thermoplastic fine particles may be prepared by dispersing the inorganic pigment and the thermoplastic fine particles at the same time, or may be prepared by dispersing them and mixing them at the time of preparing the coating liquid.

A preferable mode of the ink jet recording method of the present invention is to melt and form the thermoplastic fine particles contained in the surface layer by heat treatment after image recording. In order to give the required amount of heat in a short time, it is desirable to heat using a heat source that is as hot as possible, but if the temperature is excessively high, damage to the support, severe curling, or
Roughness of image surface and roller contamination may occur. 1
The range of 00 to 200 ° C is preferable, and the range of 100 to 150 ° C is more preferable.

The heating method may be carried out by a heater built in the printer or by another heater. The surface of the roller or belt is preferably coated with a fluororesin or a silicone resin in order to prevent contamination. At that time, it is preferable to use a silicon rubber roller or belt coated with heat resistant silicon.

The method of forming the transparent protective layer by thermal transfer of (2) can be applied to both the void type ink receiving layer and the swelling type ink receiving layer.

In order to perform such fixing, an overcoat transfer sheet obtained by applying a heat resistant film with an overcoat resin containing a thermoplastic resin as a main component is provided on the entire surface or a part of the ink receiving layer after ink jet recording. It can be manufactured by heat-transferring the overcoat resin on the ink-receiving layer after recording by superimposing and heating from the heat-resistant film side while maintaining the surface shape of the heat-resistant film, and peeling the heat-resistant film after thermal transfer. it can.

The resin (overcoat resin) forming the overcoat resin layer used in the present invention is a thermoplastic resin or a heat melting resin, such as polyethylene,
Polypropylene, polyvinyl chloride, polyvinylidene chloride, ethylene / vinyl chloride copolymer resin, ethylene vinyl acetate copolymer, coumarone resin, ketone resin, polyvinyl acetate, phenoxy resin, butadiene resin, polyethylene oxide, polyethylene terephthalate, polyvinyl alcohol, methacrylic resin, Examples thereof include derivatives of these resins, and among them, it is preferable to use a polyolefin resin such as polyethylene or polypropylene having a relatively low melting point and good chemical resistance as a main component. Furthermore, the shape of the overcoat resin is preferably a plastic pigment in the form of a slurry produced by emulsion polymerization from one or more vinyl monomers, or a dried product thereof, or a fine powder obtained by pulverizing solid plastic by various means. It is preferable that the powder be formed into fine particles. This is because if the overcoat resin layer is too flat during the formation of the transfer overcoat layer, bubbles tend to enter when there is close contact with the ink-receiving layer on which an image has been formed, and there is no escape area for the bubbles, resulting in a uniform transfer. This is because it is difficult to form the overcoat layer. The size of the resin fine particles forming these overcoat resins is usually 0.
It is preferable that the thickness is from 01 to 30 μm in terms of film formation. In the case where the overcoat resin layer is dissolved in an organic solution and applied to the heat resistant film, it is preferable to make the surface of the overcoat resin layer uneven and matte.

The melting point of the overcoat resin is 165.
It is preferable that the temperature is not higher than 0 ° C. from the viewpoint of preventing thermal blurring of an ink jet recorded image. The thickness of the transfer overcoat layer is preferably 1 to 10 μm. If the thickness of the transfer overcoat layer is smaller than this range, it becomes difficult to uniformly cover the ink receiving layer, and problems such as chemical resistance and weather resistance are likely to occur. If it is larger than this range, curl and glare that deteriorate image quality may occur. May occur.

In order to obtain the transfer overcoat layer, it is possible to efficiently obtain it by using an overcoat transfer sheet in which a heat resistant film is coated with an overcoat resin layer. The heat resistant film is preferably a sheet having a certain degree of heat resistance, at least a heat resistance at a temperature higher than the softening point of the overcoat resin, and specifically,
Polyethylene terephthalate (polyester) film, polyimide film, polyamide film, polypropylene film, polymethylpentene film (TP
X), metal foil such as aluminum foil, aluminum vapor deposition film, aluminum foil laminated film and the like are preferable. These sheets can be further heat-treated with ceramic fine particles, heat-resistant resin, or the like. The thickness of the heat resistant film is preferably as thin as possible in order to improve heat conduction, and is about 3 to 50 μm. If it is thinner than this thickness, it is difficult to handle, and wrinkles and bubbles are likely to be formed in the step of forming the transfer overcoat layer. If it is thicker than this thickness, not only the thermal conductivity deteriorates, but also the adhesion with the ink receiving layer deteriorates during transfer, and the surface of the transfer overcoat layer tends to become uneven. A heating roller is preferable as a means for heating from the heat resistant film side.

As a method of forming the resin layer by the coating of (3), a method of coating a molten resin or a method of coating a water-based resin fine particle dispersion is preferable.

The resin used for wet laminating includes polyethylene, vinyl chloride, polypropylene and the like. On the other hand, as the resin fine particles used in the aqueous resin fine particle dispersion,
For example, polycarbonate, polyacrylonitrile, polystyrene, polyacrylic acid, polymethacrylic acid, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate,
Examples thereof include polyesters, polyamides, polyethers, copolymers thereof and salts thereof. Among them, styrene-acrylic acid ester copolymer, vinyl chloride-vinyl acetate copolymer, vinyl chloride-acrylic acid ester copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid ester copolymer, SBR latex preferable.

In the ink jet recording method of the present invention, recording is preferably performed by ejecting ink by an electromechanical conversion method. Examples of the electromechanical conversion method include an electromechanical conversion method using a piezoelectric element. Examples of the piezoelectric element include a piezo element.

In the ink jet recording method of the present invention, it is also preferable to perform recording by ejecting ink by an electrothermal conversion method. Examples of the electricity / heat conversion method include an electricity / heat conversion method using a heating element.

[0115]

EXAMPLES Examples of the present invention will be described below.
The invention is not limited to these examples.

Example 1 [Preparation of Recording Medium 1] [Preparation of Silica Dispersions D1 and D2] Vapor phase silica (Nippon Aerosil) in which the average particle diameter of the primary particles dispersed in advance is about 0.012 μm. 400 L of silica dispersion B1 (pH = 2.3, containing 1% by mass of ethanol) containing 25% of A200) and 0.3% of a water-soluble fluorescent whitening agent UVITEXNF LIQUID (manufactured by Ciba Specialty Chemicals). To the cationic polymer P-1
%, N-propanol 10% and ethanol 2%
To 110 L of the contained aqueous solution C1 (pH = 2.5, containing 2 g of antifoaming agent SN381 manufactured by Sannobuco), 3
It was added with stirring at 000 rpm. Next, 54 L of a mixed aqueous solution A1 of boric acid and borax at a 1: 1 mass ratio (concentration of 3% each) was gradually added while stirring.

Then, the mixture was dispersed with a high-pressure homogenizer manufactured by Sanwa Kogyo Co., Ltd. at a pressure of 3000 N / cm ² , and the whole amount was made up to 630 L with pure water to obtain a substantially transparent silica dispersion D1.

On the other hand, 400 L of the above silica dispersion liquid B1
Is an aqueous solution C2 containing 12% of the cationic polymer P-2, 10% of n-propanol and 2% of ethanol.
3000L at room temperature to 120L (pH = 2.5)
Was added with stirring, and then 52 L of the mixed aqueous solution A1 was gradually added with stirring.

Then, a high pressure homogenizer manufactured by Sanwa Kogyo Co., Ltd. was used to disperse the mixture at a pressure of 3000 N / cm ² , and the total amount was made up to 630 L with pure water.
Got 2.

The above silica dispersions D1 and D2 were mixed with each other at 30 μm.
TCP-manufactured by Advantec Toyo Co., Ltd.
Filtration was performed using a 30 type filter.

[Preparation of Oil Dispersion] Diisodecyl phthalate (20 kg) and antioxidant (AO-1) (20 kg) were dissolved in 45 kg of ethyl acetate by heating to prepare acid-treated gelatin 8.
kg, an aqueous gelatin solution 210 containing 2.9 kg of the cationic polymer P-1 and 10.5 kg of saponin.
After mixing with L at 55 ° C. and emulsifying and dispersing with a high pressure homogenizer, the total amount was made up to 300 L with pure water to prepare an oil dispersion.

[0122]

[Chemical 8]

[Preparation of Coating Solution] Using each of the above prepared dispersions, the following additives were sequentially mixed to prepare a coating solution. In addition, each added amount is shown as an amount per 1 L of the coating liquid.

[0124]   (Coating liquid for first layer: bottom layer)   Silica dispersion D1 580 ml   Polyvinyl alcohol (Kuraray: PVA203) 10% aqueous solution 5 ml   Polyvinyl alcohol (average degree of polymerization: 3800, saponification degree 88%)     290 ml of 6.5% aqueous solution   Oil dispersion 30ml   Latex dispersion (Showa High Polymer Co., AE803) 42ml   8.5 ml of ethanol   Finish with 1000ml of pure water   (Coating liquid for second layer)   Silica dispersion D1 600ml   Polyvinyl alcohol (Kuraray: PVA203) 10% aqueous solution 5 ml   Polyvinyl alcohol (average degree of polymerization: 3800, saponification degree 88%)     270 ml of 6.5% aqueous solution   Oil dispersion 20ml   Latex dispersion (Showa High Polymer Co., Ltd .: AE803) 22 ml   8 ml of ethanol   Finish with 1000ml of pure water   (Coating liquid for third layer)   Silica dispersion D2 630ml   Polyvinyl alcohol (Kuraray: PVA203) 10% aqueous solution 5 ml   Polyvinyl alcohol (average degree of polymerization: 3800, saponification degree 88%)     270 ml of 6.5% aqueous solution   Oil dispersion 10ml   Latex dispersion (Showa High Polymer AE803) 5 ml   3 ml of ethanol   Finish with 1000ml of pure water   (4th layer coating liquid: top layer)   Silica dispersion D2 660 ml   Polyvinyl alcohol (Kuraray: PVA203) 10% aqueous solution 5 ml   Polyvinyl alcohol (average degree of polymerization: 3800, saponification degree 88%)     250% 6.5% aqueous solution   Betaine type surfactant-1 4% aqueous solution 3 ml   2 ml of a 25% aqueous solution of saponin   3 ml of ethanol   Finish with 1000ml of pure water

[0125]

[Chemical 9]

20% of each coating solution prepared as described above was used.
TCP manufactured by Advantech Toyo Co., Ltd. with filtration accuracy of μm
After filtering with a D-30 filter, it was filtered with a TCPD-10 filter.

[Coating of Recording Medium] Next, using a slide hopper type coater, each of the above coating solutions was applied onto a paper support coated with polyethylene on both sides at 40 ° C. so that the wet film thickness described below was obtained. 4 layers were applied simultaneously.

<Wet Film Thickness> First layer: 42 μm Second layer: 39 μm Third layer: 44 μm Fourth layer: 38 μm The above paper support has a width of about 1.5 m and a length of about 40 μm.
The following support wound in a roll of 00 m was used.

Polyethylene containing 6% of anatase type titanium oxide was extruded and melt-coated at a thickness of 35 μm onto the surface of a photographic base paper having a water content of 8% and a basis weight of 170 g, and a polyethylene having a thickness of 40 μm was extruded on the back surface. Melt coating,
A paper support was obtained. On the front side, after corona discharge, polyvinyl alcohol (PVA235 manufactured by Kuraray Co., Ltd.) was coated with an undercoat layer so that the amount was 0.05 g per 1 m ² of the recording medium, and on the back side, after corona discharge machining, Tg was about 80 ° C
0.4 g of styrene-acrylic acid ester-based latex binder, antistatic agent (cationic polymer) 0.
A back layer containing 1 g and 0.1 g of silica of about 2 μm as a matting agent was applied.

Drying after coating the coating liquid for the ink receiving layer is as follows.
After passing through a cooling zone kept at 5 ° C for 15 seconds to reduce the temperature of the film surface to 13 ° C, the temperature of a plurality of drying zones is appropriately set and dried, and then wound into a roll shape. A comparative recording medium 1 was obtained. The center line average surface roughness (Ra value A) of the recording medium 1 was measured by the method described below, and was 0.21 μm.

[Preparation of Yellow Ink-1] The following components were mixed and sufficiently stirred, and then filtered using a membrane filter having a pore size of 0.45 μm to prepare Yellow Ink-1.

C. I. Direct Yellow 132 2.5 mass% tetraethylene glycol dimethyl ether 10.0 mass% ethylene glycol 3.0 mass% triethylene glycol-mono-n-butyl ether 1.0 mass% 2-propanol 2.0 mass% Olphin E1010 (day Shin Chemical Co., Ltd.) 1.5% by mass Proxel GXL (D) (manufactured by Avicia Co., Ltd.) 0.1% by mass ion-exchanged water 79.9% by mass [Preparation of magenta ink-1] Yellow ink-1
In the preparation of C. I. Yellow Ink-1 except that an equal mixture of Compound M-1 and Compound M-4 was used instead of Direct Yellow 132.
Magenta Ink-1 was prepared in the same manner as in.

[Preparation of Cyan Ink-1] In the preparation of Yellow Ink-1, the water-soluble dye was replaced with C.I. I. C. instead of Direct Yellow 132. I. Cyan Ink-1 was prepared in the same manner as in Yellow Ink-1, except that Direct Blue 199 was used.

[Preparation of Black Ink-1] In the preparation of Yellow Ink-1, the water-soluble dye was replaced with C.I. I. C. instead of Direct Yellow 132. I. Black Ink-1 was prepared in the same manner as in Yellow Ink-1, except that Food Black 2 was used.

[Preparation of Ink Sets-1 to 8] An ink set 1 having the above-mentioned yellow ink-1, magenta ink-1, cyan ink-1, and black ink-1 as one unit was prepared. Further, the yellow ink-1, the magenta ink-1, and the cyan ink-of the ink set 1
1. Black Ink-1 Ink set 2 was prepared by changing the content of the water-soluble dye contained in each ink and the type and amount of the water-soluble organic solvent contained in the ink as shown in Table 1. ~ 8 were produced.

[0136]

[Table 1]

[Preparation of Image Recording Samples 1 to 8] Nozzle diameter 23 μm, driving frequency 10 kHz, number of nozzles per color 128, nozzle density of the same color 90 dpi (hereinafter, dpi represents the number of dots per 2.54 cm). The ink set 1 is set in the on-demand type ink jet printer having the maximum recording density of 720 × 720 dpi, and the recording medium 1 is further set as the recording medium, and each of the yellow, magenta, cyan and black single colors,
And an image recording sample 1 which is a solid image of 10 cm × 10 cm in which two to four colors are overprinted. Similarly, the ink set 1 is changed to the ink sets 2 to 8 and the image recording sample 2 to
8 was produced.

[Evaluation of Bleeding of Image-Recorded Samples 1-8] The following bleeding evaluation was carried out for image-forming samples 1-8. The results are shown in Table 2.

<Evaluation of bleeding> After the image recording sample was left in an environment of 30 ° C. and 80% relative humidity for 2 days, the boundary between the printed portion and the non-printed portion was observed, and the bleeding was evaluated according to the following visual evaluation criteria.

⊚: The boundary between the printed part and the non-printed part is clear even in the 4-color overprinted part. ○: The boundary between the printed part and the non-printed part is clear in the single-color printed part, but some blurring is observed in the overprinted part. : Blurring is observed even in the monochrome printing area

[0141]

[Table 2]

Further, with respect to the ink sets 1 to 8, the following clogging evaluation of nozzles was performed. [Evaluation of Nozzle Clogging] After printing with the printer in which the above ink set 1 is set and confirming the ink ejection from each nozzle, 25
It was left for 3 days in an environment of ° C and relative humidity of 30%. Ejection was performed again after standing, and the cleaning operation (suction operation) required until ejection from all nozzles was possible was evaluated according to the following criteria. Similarly, ink set 1 to ink set 2
Instead of 8, the evaluation was made according to the following criteria. The results are shown in Table 3.
Shown in.

[0143] ○: All nozzles are ejected within 3 cleaning operations ×: All nozzles are ejected after four or more cleaning operations

[0144]

[Table 3]

From the results of Tables 2 and 3, it was found that the ink jet recording ink of the present invention suppressed the nozzle clogging. Further, it was found that the image recording sample produced by using the ink for inkjet recording of the present invention has suppressed bleeding. In particular, it was found that the image recording samples 1 and 4 were suppressed in bleeding. Further, the image recording sample produced using the inkjet recording ink of the present invention had no image bronzing and had good light resistance.

Example 2 [Production of Recording Medium 2] In the production of recording medium 1,
Instead of finishing the fourth layer coating liquid with pure water instead of the layer coating liquid, a 20% aqueous solution of 13.1 mmol zirconyl acetate (molecular weight 215) was gradually added to 0.01 mm.
recording medium 1 except that a translucent coating solution was used by adding pure water so that the total volume of the solution would be 1000 ml, and finally using a semi-transparent coating solution. 2 was produced.

[Preparation of Recording Medium 3] In preparation of Recording Medium 1, basic polyaluminum hydroxide (manufactured by Riken Green Co., Ltd.) was prepared before finishing the fourth coating liquid with pure water instead of the coating liquid for the fourth layer. Recording medium 3 was prepared in the same manner as recording medium 1 except that 3 g of Purachem WT) was added and finally pure water was added so that the volume of the entire solution was 1000 ml.

[Preparation of Recording Medium 4] Recording medium 4 was prepared by applying the following overcoat liquid on the surface of the ink receiving layer of recording medium 1 at 20 g / m ² and then drying.

(Overcoat liquid) 1 part of borax was mixed with 9 parts of water.
7.8 parts, surfactant (Dainippon Ink and Chemicals, F-
144D) 0.2 part and POLON-MF-50 1 manufactured by Shin-Etsu Chemical Co., Ltd. as a cationic silane coupling agent.
Parts were added and stirred to obtain an overcoat liquid.

[Preparation and Evaluation of Image Recording Sample] Example 1
In, the image recording sample was prepared and the bleeding was evaluated in the same manner as in Example 1 except that the recording medium 1 was changed to the recording mediums 2 to 4, and the image recorded using the inkjet recording ink of the present invention The recorded sample had no bleeding and had no problem.

Example 3 In Example 1, the printer was an inkjet printer BJS700 manufactured by Canon, the recording medium 1 was Pictorico Pro manufactured by PICTORICO, and the compound M-1 and the compound M, which are water-soluble dyes of magenta ink-1, were used. -4
Nozzle clogging was evaluated in the same manner as in Example 1 except that an equal mixture of the compound M-1 and the compound M-9 was used in place of the equal mixture of No. 1, and an image recording sample was formed, and bleeding was performed. However, it was found that the ink jet recording ink of the present invention suppressed the nozzle clogging and the bleeding of the image recording sample. Furthermore, no kogation (sticking of the head) was observed even after continuous emission for a long time.

Example 4 In the same manner as in Example 1, except that the printer was an ink jet printer hp pc1160 manufactured by Hewlett-Packard Company, and the recording medium 1 was a light-resistant premium photo paper (thick) manufactured by Hewlett-Packard Company, Nozzle clogging was evaluated, and further bleeding was evaluated by forming an image recording sample. The ink jet recording ink of the present invention has suppressed nozzle clogging and further bleeding of the image recording sample. I found out.

Example 5 The same procedure as in Example 1 was repeated except that the printer used was a printer Seiko Epson inkjet printer CL-750 and the recording medium 1 was a photo print paper 2 produced by Seiko Epson. Evaluation of clogging and further bleeding by forming an image recording sample were performed. The ink jet recording ink of the present invention has suppressed nozzle clogging and further bleeding of the image recording sample. I found out.

Example 6 Light magenta ink-1 and light cyan ink-1 in which the total dye concentrations of magenta ink-1 and cyan ink-1 prepared in Example 1 were each 0.5% by mass were prepared, respectively. An ink set 9 including yellow ink-1, magenta ink-1, cyan ink-1, black ink-1, light magenta ink-1, and light cyan ink-1 was prepared, and an ink jet printer PM-890C manufactured by Seiko Epson Corporation and The ink jet printer BJ F900 manufactured by Canon Inc. was set. Further, an image recording sample was prepared by using Photoike QP Photo Gloss Paper Thick DX made by Konica as a recording medium, and the bleeding was evaluated, but it was found that almost no bleeding occurred.

Example 7 [Production of Recording Medium 5] In the production of the recording medium 1,
Instead of the layer coating liquid, a mixed liquid of the fourth layer coating liquid and the following thermoplastic fine particle dispersion liquid (thermoplastic fine particles: inorganic pigment, after being mixed so that the solid content mass ratio is 45:55, the viscosity is A recording medium 5 was prepared in the same manner as the recording medium 1 except that (diluted with pure water so as to give 45 mPa · s) was used.

(Thermoplastic Fine Particle Dispersion) Styrene-acrylic latex polymer (Tg 78 ° C., average particle size 250 n) emulsion-polymerized using a nonionic surfactant as an emulsifier.
m, solid content concentration 40%) with a 6% nitric acid aqueous solution to a pH of 4.
It was adjusted to 7, and this was used as a thermoplastic fine particle dispersion.

[Preparation of Image Recording Sample and Evaluation of Bleeding] In Example 1, the recording medium 1 was used as the recording medium 5, and the recording medium 5 after image recording was made of silicone (KS-830E;
An image recording sample was formed and bleeding was evaluated in the same manner as in Example 1 except that the nickel belt coated with Shin-Etsu Chemical Co., Ltd. (heating roller temperature: 120 ° C.) was used for heating and pressing. It was found that bleeding was suppressed in the image recording sample formed using the ink for inkjet recording of the present invention.

Example 8 [Preparation of Image Recording Samples 1'to 8 '] The ink receiving layer of the image recording samples 1 to 8 prepared in Example 1 and the overcoat resin layer surface of the overcoat transfer sheet described below are overlaid and heated. Image recording samples 1'to 8'having a glossy overcoat layer surface by passing a pressure device to transfer the overcoat resin onto the image receiving sheet and peeling off the heat resistant film.
Was produced.

(Overcoat transfer sheet) A polyethylene glycol terephthalate film (E150 made by Diamond Foil) having a smooth surface with a thickness of 12 μm was used as a heat-resistant film, and Chemipearl (made by Mitsui Petrochemical, polyethylene aqueous solution) was used as a thermoplastic overcoat resin layer. Dispersion) 20 parts (solid content mass), polyvinyl alcohol adhesive 7 parts (solid content mass), 40 parts of water is applied to a coating liquid of 5 g / m ² (solid content mass) and dried. It was made.

[Evaluation of bleeding of image recording samples 1'to 8 ']
Bleeding evaluation was performed on the obtained image forming sample,
It was found that bleeding was suppressed in the image recording sample formed using the ink for inkjet recording of the present invention. This shows that the occurrence of bleeding can be suppressed by using the inkjet recording ink of the present invention even in the case where bleeding-prone processing such as laminating is performed on the image of the image recording sample. There is.

[0161]

INDUSTRIAL APPLICABILITY According to the present invention, an ink jet recording ink, an ink jet recording ink set and an ink jet recording ink or ink jet recording capable of suppressing nozzle clogging and further suppressing bleeding and forming a high quality ink jet image. It was possible to provide an inkjet recording method using the ink set for use.

Claims (11)

[Claims] 1. An inkjet recording ink containing a water-soluble dye, water, and a water-soluble organic solvent, wherein the content of the water-soluble organic solvent is 5 to 50% by mass, and tetraethylene glycol occupies the water-soluble organic solvent. An ink jet recording ink, wherein the ratio of dimethyl ether is 40 to 100% by mass. 2. An ink jet recording ink containing a water-soluble dye, water and a water-soluble organic solvent, wherein the content of the water-soluble organic solvent is 5 to 50% by mass, and tetraethylene glycol dimethyl ether is used as the water-soluble organic solvent. And an ethylene glycol and / or diethylene glycol. 3. The total content of the tetraethylene glycol dimethyl ether, further the ethylene glycol and / or the diethylene glycol in the water-soluble organic solvent is 50 to 100% by mass. Ink for inkjet recording. 4. The ratio of glycerin in the water-soluble organic solvent is 25% by mass or less.
4. The inkjet recording ink according to any one of 3 above. 5. At least a yellow ink jet recording ink, a magenta ink jet recording ink,
In an ink jet recording ink set having a cyan ink jet recording ink and a black ink jet recording ink, all of the ink jet recording inks are the ink jet recording inks according to any one of claims 1 to 4. Characteristic inkjet recording ink set. 6. An ink jet recording method according to claim 1, wherein the ink is used for recording on a recording medium having an ink receiving layer containing a water-soluble binder. An ink jet recording method comprising the ink set for ink jet recording according to claim 5. 7. The ink jet recording method according to claim 6, wherein the ink receiving layer has a porous structure. 8. The inkjet recording method according to claim 6, wherein a fixing process is performed on the recorded recording medium. 9. The ink jet recording method according to claim 6, wherein the recording is performed by an on-demand method. 10. The ink jet recording method according to claim 6, wherein recording is performed by ejecting the ink by an electromechanical conversion method. 11. The ink jet recording method according to claim 6, wherein recording is performed by ejecting the ink by an electric / heat conversion method.