JP2002370442A - Transfer type ink jet recording medium, ink jet recording method and image forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer type ink jet recording medium having a surface roughness within a proper range, and an ink jet recording method and an image forming method, with which a clear image can be surely transferred by employing the transfer type ink jet recording medium. SOLUTION: The surface of the transfer type ink jet recording medium has 500 to 12,000 projections per square millimeter each having the height of 1 to 10 μm. Its ink jet recording method and its image forming method are also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer type ink jet recording medium, an ink jet recording method, and an image forming method. More specifically, the present invention relates to a method for forming an ink image on a transfer type ink jet recording medium and transferring the image to a recording medium. The present invention relates to an image forming method for finally obtaining an ink image on the recording medium.

[0002]

2. Description of the Related Art A transfer type ink jet printer is characterized in that the ink jet is not clogged due to unintended contact between recording paper or paper dust and a recording head, and high reliability can be obtained. As such a transfer type ink jet printer, a configuration described in U.S. Pat. Nos. 4,538,156 and 5,099,256 is known.

In these apparatuses, an ink jet recording head (hereinafter, referred to as a recording head) having a plurality of nozzles is provided on a cylindrical transfer medium via a gap. The transfer medium includes a metal tube and an elastic layer that covers the metal tube. Silicon rubber is used as the elastic layer.

Japanese Patent Application Laid-Open No. Hei 3-242667 proposes improving the transferability by reducing the surface roughness of the silicone elastomer on the image forming surface in the thermal transfer system to a maximum height Rmax of 10 μm or less.

Furthermore, Japanese Patent Application Laid-Open No. 7-17030 proposes to improve transferability by using an elastic material as a transfer medium.

In these apparatuses, since an ink image is once formed on a transfer medium and then transferred to a final image forming body, it is necessary to minimize mixing, blurring of an image and a decrease in density due to ink bleeding on the transfer medium. . In the conventional example, attention is paid to transferability, and Rmax is 10 μm or less, or Rmax is 1 μm.
m to 25 μm. However,
It has been found that even when Rmax is within a certain range, the effect is not sufficiently exhibited depending on the resolution. In addition, since the surface tension of water is large, a repelling phenomenon is remarkably observed in an ink containing water as a main component.

In particular, the repelling phenomenon is more likely to occur as the surface becomes smoother. Conversely, if the surface becomes rough, the transferability deteriorates, and at the same time, the ink flows into the concave portions, causing image flow.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a transfer type ink jet recording medium (hereinafter simply referred to as a transfer medium) in which repelling phenomenon is prevented and transfer is excellent. Or a recording medium), in other words, a transfer type ink jet recording medium having a surface roughness in an appropriate range is provided, and by using the transfer type ink jet recording medium, a clear image can be reliably transferred. The present invention provides a recording method and an image forming method.

[0009]

The above object of the present invention has been attained by the following constitutions.

[0010] 1. A protrusion with a height of 1 to 10 μm on the surface,
A transfer type inkjet recording medium having 500 to 12000 pieces / mm ² .

2. 2. The transfer type inkjet recording medium according to the above 1, wherein the surface layer contains a material that does not absorb ink.

3. 3. The transfer type ink jet recording medium according to the above 1 or 2, wherein the surface layer has a function of increasing the viscosity of the ink.

4. 4. The transfer type ink jet recording medium according to any one of the above items 1 to 3, comprising at least three layers.

5. 5. The transfer type ink jet recording medium according to any one of items 1 to 4, further comprising an elastic intermediate layer.

6. 5. The transfer type ink jet recording medium according to any one of items 1 to 4, wherein the transfer type ink jet recording medium has a porous intermediate layer.

[7] A transfer type ink jet recording medium, wherein the surface layer is a dense layer of a porous film.

8. A transfer type ink jet recording medium, wherein the surface layer is a dense layer of a porous film, and the surface layer contains a material which does not absorb ink.

9. 7. The transfer type ink jet recording medium according to the item 6, wherein the surface layer is a dense layer of a porous film, and the surface layer contains a material that does not absorb ink.

10. The print density of the ink of the transfer type inkjet recording medium according to any one of 1 to 9 is 5 to 10.
An ink jet recording method characterized by recording at ²⁰ nl / mm ² .

11. 10. An image forming method using the transfer type ink jet recording medium according to any one of the items 1 to 9.

The present invention will be described in more detail. In the present invention, the number of protrusions of 1 μm or more with respect to the center of the surface is 500 /
mm ^{2 to} 12000 pieces / mm ² . If less than this, the effect of the present invention cannot be obtained. On the other hand, if it is more than this, bleeding is suppressed, but dirt is generated or processing is difficult.

The surface shape can be processed by sandblasting, embossing or the like, but embossing is preferable to obtain a desired shape with good reproducibility.

The surface roughness Ra ranges from 0.2 μm to 2.
5 μm is preferred. More preferably 0.4 μm to 1.5
μm.

In the present invention, the density of the projections on the surface and the surface roughness Ra are measured with a surface roughness meter (RST / PLUS WYCO
Manufactured by the company).

As a method of increasing the viscosity of the ink on the transfer medium, heating, evaporating the solvent, increasing the viscosity by cooling, absorbing with a solvent-absorbing substance, and incorporating a photocrosslinking agent,
There is a method such as light irradiation.

Examples of the layer that does not absorb ink used for the surface layer include metals such as stainless steel, fluorine-based resins, silicon-based resins, Teflon (R) -based resins, polyethylene, and polystyrene.

The porous film according to the present invention is formed by laminating a porous film having a dense layer on the surface on at least one surface of a substrate, and the porous film extends in the thickness direction on the substrate side. have. This porous film usually has a dense layer on the surface side of the porous film and voids extending in the thickness direction.

In the above porous membrane, the average pore size of the dense layer on the surface is 0.01 to 1.5 μm, preferably 0.02 to 1.5 μm.
It is about 1.2 μm, more preferably about 0.05 to 1.0 μm. The voids usually extend in the thickness direction of the porous film and are regularly or irregularly adjacent to each other.
The shape of the void is not particularly limited, but is usually a columnar shape or a curved columnar shape. In addition, in this specification, a void means a space | gap sufficiently larger than the space | gap of a dense layer, and it is 5-200 with respect to the space | gap of a dense layer.
Twice, preferably about 7 to 150 times.

The width of the void in the plane direction is 0.1 to 10
The thickness is about 0 μm, preferably about 0.5 to 50 μm, and more preferably about 1 to 30 μm. If the width of the void in the planar direction is less than 0.1 μm, the ink absorbency of the ink decreases, and if it exceeds 100 μm, the sharpness of the image may decrease.

The thickness of the dense layer is, for example, about 1 to 50%, preferably about 5 to 30%, and the thickness of the void layer is, for example, 30 to 90%, preferably about 40%. About 80%. In a porous membrane,
A porous intermediate region may be formed between the dense layer and the void layer.

The ink absorbency is also affected by the porosity of the porous film. In the porous film, the porosity of the film surface (print surface, that is, the surface on the dense layer side) is 20 to 70.
%, Preferably about 30 to 60%. 20 porosity
If it is less than 70%, the surface area of the absorbing surface is small, so that the absorption ability of the film to the ink is low. If it exceeds 70%, the strength of the porous film itself may be reduced.

The porous membrane is made of a resin,
It may have a microphase separation structure, particularly a microphase separation structure by a phase inversion method. This microphase-separated structure can be formed by coagulation of a gel phase that has been phase-separated due to a change in the composition of the cast resin solution.

The resin constituting the porous film is not particularly limited as long as a porous film having the above characteristics can be formed, and various resins (a thermoplastic resin and a thermosetting resin) can be used. A plastic resin is used. Specifically, the following resins or polymers can be exemplified.

Cellulosic resin (cellulose derivative):
Cellulose esters, for example, cellulose acetate,
Organic acid esters such as cellulose propionate, cellulose butyrate, cellulose acetate propionate, cellulose acetate butyrate, and cellulose acetate phthalate; cellulose nitrate, cellulose sulfate,
Inorganic acid esters such as cellulose phosphate; mixed acid esters such as cellulose nitrate acetate; cellulose ethers: for example, methyl cellulose, ethyl cellulose, isopropyl cellulose, butyl cellulose, benzyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, cyano Ethyl cellulose and other vinyl polymers, olefin polymers, (olefin homo- or copolymers): For example, polyethylene, polypropylene, poly 1-butene, polyisobutene, polybutadiene, polyisoprene, polyallene, ethylene-propylene copolymer Such as copolymers of olefins and copolymerizable monomers, ethylene-vinyl acetate copolymers, ethylene- (meth) acrylic Acid copolymers: for example, ethylene - (meth) acrylic acid ester copolymer, and modified polyolefins, halogen-containing vinyl polymer: for example, a homo- or copolymer of a halogen-containing vinyl monomer, polyvinyl chloride,
Copolymers of halogen-containing vinyl monomers and copolymerizable monomers such as polyvinylidene chloride, polyvinyl bromide, polyvinyl fluoride, and polyvinylidene fluoride: for example, vinyl chloride-vinyl acetate copolymer, vinylidene chloride- Vinyl ester polymers or vinyl ester polymers such as vinyl acetate copolymer, vinylidene chloride- (meth) acrylamide copolymer, vinylidene chloride- (meth) acrylic acid copolymer, vinylidene chloride- (meth) acrylic acid ester copolymer Derivative: for example, polyvinyl acetate, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyvinyl acetal-based polymer (polyvinyl formal, polyvinyl acetal, polyvinyl butyral, etc.), styrene-based polymer: for example, aromatic vinyl monomer (Styrene monomer Homo- or copolymers (polystyrene, poly (α-methylstyrene), poly (4-chlorostyrene), etc.) and copolymers of aromatic vinyl monomers and copolymerizable monomers (styrene- (meta- ) Acrylic acid C1-C10
Alkyl ester copolymer, styrene-maleic anhydride copolymer, styrene-maleimide copolymer, etc.), allyl alcohol-based polymer: for example, allyl alcohol-C1 to C6 alkyl vinyl ether copolymer (allyl alcohol-methyl vinyl ether copolymer) Polyvinyl ketones: for example, polyvinyl methyl ketone, polyvinyl methyl isobutyl ketone, polymethyl isopropenyl ketone, etc. Polyalkyl vinyl ethers: for example, polymethyl vinyl ether, methyl vinyl ether-maleic anhydride copolymer, etc. ) Acrylic polymer: For example, a homo- or copolymer of a (meth) acrylic monomer [(meth) acrylonitrile, (meth) acrylic acid ester monomer, etc.), and a copolymer with a (meth) acrylic monomer Polymerizable monomer ( Copolymer with vinyl ester monomer, heterocyclic vinyl monomer, aromatic vinyl monomer, vinyl monomer such as polymerizable unsaturated dicarboxylic acid or derivative thereof) Polysulfone polymer: Polyoxide-based polymers such as polysulfone and polyethersulfone: Polyoxymethylene and polyoxymethylene copolymer (polyacetal resin), polyoxyethylene, polyoxypropylene, polyoxyethylene-polyoxypropylene copolymer, and other polyamide- and polyimide-based polymers Coalescing: polyamide (nylon 6, nylon 66, nylon 11, nylon 1
2, nylon 6/11, nylon 6/12, etc.), polyester amide, polyimide, polyamide imide, etc., polyester polymer (saturated polyester, etc.): poly C2-C6 alkylene terephthalate (polyethylene terephthalate, polybutylene terephthalate, etc.), poly C2-C6 alkylene naphthalate (such as polyethylene naphthalate), copolyester (where at least part of the diol component and terephthalic acid is ethylene glycol, propylene glycol, butanediol, hexanediol, polyoxy C2-C4 alkylene glycol, cyclohexanedimethanol, etc.) Diol component), aromatic dicarboxylic acids such as phthalic acid and isophthalic acid or acid anhydrides thereof, and C6 to C12 such as adipic acid.
Polyalkylene terephthalate copolyesters and polyalkylene naphthalate copolyesters substituted with other diol components or dicarboxylic acid components such as aliphatic dicarboxylic acids, etc. Polycarbonate: Aromatic polycarbonate (bisphenol A type polycarbonate, etc.), other polymers : These resins or polymers such as thermoplastic urethane polymers (polyurethane using diol component such as polyester diol, polyether diol, etc.), polyether ether ketone, polyether ester, polyphenylene ether, polyphenylene sulfide, polyethylene imine They can be used alone or in combination of two or more.

Preferred resins include at least one resin selected from cellulose derivatives, vinyl polymers and polysulfone polymers. Preferred polysulfone-based polymers include, for example, polyethersulfone.

Of the vinyl polymers, (meth) acrylonitrile polymers and (meth) acrylate polymers are preferred. That is, a homo- or copolymer of at least one (meth) acrylic monomer selected from (meth) acrylonitrile and (meth) acrylic ester-based monomers, Of at least one monomer selected from a vinyl ester monomer, a heterocyclic vinyl monomer, an aromatic vinyl monomer, a polymerizable unsaturated dicarboxylic acid or a derivative thereof, and the like. Is preferred.

The (meth) acrylonitrile-based polymer includes
It includes polyacrylonitrile, poly (meth) acrylonitrile, and a copolymer of (meth) acrylonitrile and a copolymerizable monomer. Examples of the copolymerizable monomer include vinyl ester monomers (vinyl formate, vinyl acetate, vinyl propionate, etc.), (meth) acrylic monomers [(meth) acrylic acid, (meth) acrylic (Meth) acrylic acid C1 such as methyl acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate
C10 alkyl ester; hydroxyalkyl (meth) acrylate such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate; glycidyl (meth) acrylate, dimethylamino Ethyl (meth)
Alkylamino-alkyl (meth) acrylates such as acrylate, diethylaminoethyl (meth) acrylate, diethylaminopropyl (meth) acrylate;
(Meth) acrylamide, N-methyl (meth) acrylamide, methylol (meth) acrylamide, alkoxymethyl (meth) acrylamide, etc.), heterocyclic vinyl monomers (vinylpyrrolidone, vinylpyridine, vinylpiperidine, vinylimidazole, vinyl A 5- to 6-membered heterocyclic vinyl monomer containing at least one hetero atom selected from nitrogen, oxygen and sulfur atoms such as carbazole, etc., and aromatic vinyl monomers (styrene, vinyl toluene, α -Methylstyrene, etc.), polymerizable unsaturated dicarboxylic acids or derivatives thereof (itaconic acid,
Maleic acid, maleic anhydride, fumaric acid, lower alkyl esters or acid anhydrides thereof, maleimide, N-alkylmaleimide, N-phenylmaleimide, etc.). These copolymerizable monomers can be used alone or in combination of two or more.

Preferred copolymerizable monomers include vinyl ester monomers (eg, vinyl acetate), (meth) acrylic monomers [(meth) acrylic acid, (meth) acrylic acid C1
-C8 alkyl ester, C1-C4 alkylamino-
C2-C4 alkyl (meth) acrylates, etc.], nitrogen-containing heterocyclic vinyl monomers (such as vinylpyrrolidone)
Or a combination of these.

As the (meth) acrylonitrile copolymer, for example, acrylonitrile-vinylpyrrolidone copolymer, acrylonitrile-vinyl acetate copolymer, acrylonitrile-C1 to C8 alkyl (meth) acrylate copolymer (acrylonitrile-methyl acrylate) Copolymers), acrylonitrile-vinylpyrrolidone-
C1-C8 alkyl (meth) acrylate copolymer, acrylonitrile-vinyl acetate-C1-C8 alkyl (meth) acrylate copolymer, acrylonitrile- (meth) acrylic acid copolymer, acrylonitrile-vinyl acetate- (meth) acrylic acid Copolymer, acrylonitrile-
C1-C8 alkyl (meth) acrylate- (meth) acrylic acid copolymers can be exemplified.

As the (meth) acrylic ester-based polymer, a homo- or copolymer of the above (meth) acrylic ester [for example, poly (meth) acrylic acid, poly (meth)
C1-C18 alkyl acrylate homo- or copolymer, poly (meth) acrylate, poly (meth) acrylate
C1-C10 alkyl (meth) acrylates such as ethyl acrylate, poly (butyl) methacrylate, methyl methacrylate- (meth) acrylic acid copolymer
(Meth) acrylic acid copolymer, methacrylic acid C1-C10 alkyl ester-acrylic acid C1-C10 alkyl ester copolymer such as methyl methacrylate-acrylic acid C1-C10 alkyl ester copolymer], (meth) acrylic Of copolymer-based monomers and copolymerizable monomers (such as vinyl ester-based monomers, aromatic vinyl monomers, polymerizable unsaturated dicarboxylic acids or derivatives thereof) [for example, methyl methacrylate-styrene] (Meth) acrylic acid C1-C10 alkyl ester such as copolymer (meth) acrylic acid C1-C10 alkyl ester-styrene copolymer, methyl methacrylate- (meth) acrylic acid-styrene copolymer- (meth) ) Acrylic acid-styrene copolymer, etc.].

The porous layer may have a high wettability to the aqueous ink and have a hydrophilic surface sufficient for the aqueous ink to penetrate into the pores. Such a porous layer can be composed of a hydrophilic resin. In addition, the hydrophilic resin is
The contact angle is less than 80 ° (preferably 0 to 60 °, especially 0 to 60 °)
(Approximately 40 °). The contact angle is the angle between the tangent to the water droplet and the polymer surface at the intersection of the surface of the water droplet and the polymer surface at room temperature with the spread of the water droplet on the polymer surface stopped.

The thickness of the porous film is not particularly limited and can be selected according to the application, and is, for example, about 1 to 300 μm, preferably about 3 to 250 μm, and more preferably about 5 to 50 μm. If the film thickness is too small, the strength will be insufficient.

In the present invention, it is preferable to use an elastic substance between the cylindrical support and the surface layer in order to improve the transferability of the transfer medium. This includes silicone rubber, fluoro rubber,
Urethane rubber, NR natural rubber, SBR, NBR, nitrile rubber, CR chloroprene, HR butyl rubber, EPDM
Rubber materials such as ethylene propylene rubber and Hypalon can be used.

Further, a cleaning means for cleaning the ink remaining on the intermediate transfer layer which has not been completely transferred to the recording medium may be provided between the fixing roller and the recording head.

Next, the ink jet recording ink will be described. For the transfer medium of the present invention, conventionally known inkjet inks can be used without any particular limitation.

Preferred among the inks for ink jet recording are inks containing a water-soluble dye or water-dispersed particles as a colorant. The water-soluble dye is selected from water-soluble direct dyes, acid dyes, reactive dyes, and basic dyes, and these may be used alone or in combination of two or more. These dyes are used by dissolving them in a solvent appropriately selected and used as desired. The following are representative dyes, but the present invention is not limited thereto.

<Direct Dye> C.I. I. Direct Yellow 1, 4, 8, 11, 12, 24, 26, 27, 28, 3
3, 39, 44, 50, 58, 85, 86, 100, 1,
10, 120, 132, 142, 144; I. Direct Red 1,2,4,9,11,13,17,2
0, 23, 24, 28, 31, 33, 37, 39, 4
4, 47, 48, 51, 62, 63, 75, 79, 8
0, 81, 83, 89, 90, 94, 95, 99, 22
0, 224, 227, 243; I. Direct Blue 1, 2, 6, 8, 15, 22, 25, 71, 76, 7
8, 80, 86, 87, 90, 98, 106, 108,
120, 123, 163, 165, 192, 193, 1
94, 195, 196, 199, 200, 201, 20
2, 203, 207, 236, 237; I. Direct Black 2, 3, 7, 17, 19, 22, 32, 3
8, 51, 56, 62, 71, 74, 75, 77, 10
5, 108, 112, 117, 154.

<Acid Dye> C.I. I. Acid Yellow 2, 3, 7, 17, 19, 23, 25, 29, 38, 4
2, 49, 59, 61, 72, 99; I. Acid orange 56, 64; I. Acid Red 1,
8, 14, 18, 26, 32, 37, 42, 52, 5
7, 72, 74, 80, 87, 115, 119, 13
1, 133, 134, 143, 154, 186, 24
9, 254, 256; C.I. I. Acid Violet 1
1, 34, 75; I. Acid Blue 1, 7, 9,
29, 87, 126, 138, 171, 175, 18
3, 234, 236, 249; I. Acid green 9, 12, 19, 27, 41; I. Acid Black 1, 2, 7, 24, 26, 48, 52, 58, 6
0, 94, 107, 109, 110, 119, 131,
155.

<Reactive dye> C.I. I. Reactive Yellow 1, 2, 3, 13, 14, 15, 17, 37, 4
2, 76, 95, 168, 175; I. Reactive Red 2, 6, 11, 21, 22, 23, 24, 3
3, 45, 111, 112, 114, 180, 218,
226, 228, 235; I. Reactive Blue 7, 14, 15, 18, 19, 21, 25, 38, 4
9, 72, 77, 176, 203, 220, 230, 2
35; I. Reactive Orange 5, 12, 13,
35, 95; I. Reactive Brown 7, 11,
33, 37, 46; I. Reactive Green 8,
19; I. Reactive Violet 2, 4, 6,
8, 21, 22, 25; C.I. I. Reactive Black 5, 8, 31, 39.

<Basic dye> C.I. I. Basic yellow 11, 14, 21, 32; I. Basic red 1, 2, 9, 12, 13; I. Basic violet 3, 7, 14; I. Basic Blue 3, 9,
24, 25.

Other dyes that can be used in the ink include chelate dyes and azo dyes used in so-called silver dye bleaching light-sensitive materials (for example, Cibachrome manufactured by Ciba-Geigy). For the chelate dye, for example, the description in British Patent 1,077,484 can be referred to. Regarding the azo dye for the silver dye bleaching photosensitive material, refer to, for example, the descriptions in British Patents 1,039,458, 1,004,957, 1,077,628 and U.S. Pat. No. 2,612,448. You can do it.

The content of the water-soluble dye used in the ink is preferably 1 to 10% by mass based on the total mass of the ink.

In the present invention, pigments and disperse dyes can be used as colorants. These pigments and disperse dyes are used by dispersing in a solvent that is appropriately selected and used as desired. Representative examples are described below, but the present invention is not limited to these.

The disperse dyes preferably used in the present invention include, for example, C.I. I. Disperse Yellow 3, 4,
5, 7, 9, 13, 24, 30, 33, 34, 42, 4,
4, 49, 50, 51, 54, 56, 58, 60, 6
3, 64, 66, 68, 71, 74, 76, 79, 8
2, 83, 85, 86, 88, 90, 91, 93, 9
8, 99, 100, 104, 114, 116, 118,
119, 122, 124, 126, 135, 140, 1
41, 149, 160, 162, 163, 164, 16
5, 179, 180, 182, 183, 186, 19
2, 198, 199, 202, 204, 210, 21
1, 215, 216, 218, 224; I. Dis
perserange1,3,5,7,11,13,
17, 20, 21, 25, 29, 30, 31, 32, 3
3, 37, 38, 42, 43, 44, 45, 47, 4
8, 49, 50, 53, 54, 55, 56, 57, 5
8, 59, 61, 66, 71, 73, 76, 78, 8
0, 89, 90, 91, 93, 96, 97, 119, 1
27, 130, 139, 142; I. Disper
se Red 1, 4, 5, 7, 11, 12, 13, 1
5, 17, 27, 43, 44, 50, 52, 53, 5
4, 55, 56, 58, 59, 60, 65, 72, 7
3, 74, 75, 76, 78, 81, 82, 86, 8
8, 90, 91, 92, 93, 96, 103, 105,
106, 107, 108, 110, 111, 113, 1
17, 118, 121, 122, 126, 127, 12
8, 131, 132, 134, 135, 137, 14
3, 145, 146, 151, 152, 153, 15
4, 157, 159, 164, 167, 169, 17
7, 179, 181, 183, 184, 185, 18
8, 189, 190, 191, 192, 200, 20
1, 202, 203, 205, 206, 207, 21
0, 221, 224, 225, 227, 229, 23
9, 240, 257, 258, 277, 278, 27
9, 281, 288, 298, 302, 303, 31
0, 311, 312, 320, 324, 328;
I. DisperseViolet 1, 4, 8, 23,
26, 27, 28, 31, 33, 35, 36, 38, 4
0, 43, 46, 48, 50, 51, 52, 56, 5
7, 59, 61, 63, 69, 77; I. Disp
erse Green 9; I. Disperse
Brown 1, 2, 4, 9, 13, 19; I.
Disperse Blue 3, 7, 9, 14, 1
6, 19, 20, 26, 27, 35, 43, 44, 5
4, 55, 56, 58, 60, 62, 64, 71, 7
2, 73, 75, 79, 81, 82, 83, 87, 9
1, 93, 94, 95, 96, 102, 106, 10
8, 112, 113, 115, 118, 120, 12
2, 125, 128, 130, 139, 141, 14
2,143,146,148,149,153,15
4, 158, 165, 167, 171, 173, 17
4, 176, 181, 183, 185, 186, 18
7, 189, 197, 198, 200, 201, 20
5, 207, 211, 214, 224, 225, 25
7, 259, 267, 268, 270, 284, 28
5, 287, 288, 291, 293, 295, 29
7, 301, 315, 330, 333; I. Dis
perseBlack 1, 3, 10, 24; and the like.

The pigments preferred in the present invention include, for example, carbon black pigments (CI Pigment Bl).
ack 7); I. Pigment Yellow
12, 13, 14, 16, 17, 73, 74, 75,
83, 108, 109, 110, 180, 182;
I. Pigment Red 5, 7, 12, 112,
123, 168, 184, 202; I. Pigme
nt Blue 1, 2, 3, 15: 3, 16, 22,
60; I. Vat Blue 4, 60; and the like.

In addition to the above, when red, green, blue and intermediate colors are required, the following pigments are preferably used alone or in combination. I. Pigment Red 209, 224, 1
77, 194; I. Pigment Orange
43; I. Vat Violet 3; I.
Pigment Violet 19, 23, 37;
C. I. Pigment Green 36, 7; C.I.
I. Pigment Blue 15: 6; and the like.

The above-mentioned pigment and disperse dye are preferably mixed with a dispersant and other additives necessary for various desired purposes, and dispersed and used by a disperser. In the present invention, when the pigment and the disperse dye used in the ink are dispersed in the state of dispersed particles, the effect of the present invention is great.

A surfactant is used as a dispersant. As the surfactant used in the present invention, any of cationic, anionic, amphoteric and nonionic can be used. As the cationic surfactant, an aliphatic amine salt,
Aliphatic quaternary ammonium salts, benzalkonium salts, benzethonium chloride, pyridinium salts, imidazolinium salts, and the like. Examples of the anionic surfactant include fatty acid soap, N-acyl-N-methylglycine salt,
N-acyl-N-methyl-β-alanine salt, N-acyl glutamate, acylated peptide, alkyl sulfonate, alkyl benzene sulfonate, alkyl naphthalene sulfonate, dialkyl sulfosuccinate, alkyl sulfo acetate, α-olefin sulfonate, N-acylmethyl taurine, sulfated oil, higher alcohol sulfate, secondary higher alcohol sulfate, alkyl ether sulfate, secondary higher alcohol ethoxy sulfate, polyoxyethylene alkylphenyl Ether sulfate, monoglycol sulfate,
Fatty acid alkylolamide sulfates, alkyl ether phosphates, alkyl phosphates, and the like. Examples of the amphoteric surfactant include a carboxybetaine type, a sulfobetaine type, an aminocarboxylate, and imidazolinium betaine. Examples of the nonionic activator include polyoxyethylene secondary alcohol ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene sterol ether, polyoxyethylene lanolin derivative polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene glycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, Oxyethylene castor oil, hydrogenated castor oil, polyoxyethylene sorbitol fatty acid ester, polyethylene glycol fatty acid ester, fatty acid monoglyceride, polyglycerin fatty acid ester, sorbitan fatty acid ester, propylene glycol fatty acid ester, sucrose fatty acid ester, fatty acid alkanolamide, polyoxyethylene Fatty acid amide, polyoxyethylene alkylamine, alkylamine oxide, acetyl Glycol, acetylene alcohol, and the like.

For the ink, a surfactant can be used to accelerate the penetration of the ink droplets after ejection into the medium. The surfactant that can be used is not limited as long as it has no adverse effect such as storage stability on the ink, and the same surfactant as that used as the above dispersant is used. .

In the present invention, an electric conductivity adjusting agent may be used. Examples of the electric conductivity adjusting agent include inorganic salts such as potassium chloride, ammonium chloride, sodium sulfate, sodium nitrate and sodium chloride; There are water-soluble amines such as ethanolamine.

Depending on the purpose of improving ejection stability, compatibility with print heads and ink cartridges, storage stability, image storability, and other various performances, a viscosity adjuster, a specific resistance adjuster, a film forming agent, and an ultraviolet absorbing agent. Agents, antioxidants, anti-fading agents, rust inhibitors, preservatives and the like can also be added.

The ink contains water and a water-soluble organic solvent as main liquid medium components. Water-soluble organic solvents include those having 1 to 4 carbon atoms.
(E.g., methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, isobutyl alcohol, etc.) and amides (e.g., dimethylformamide, dimethylacetamide, etc.) ), Ketones or keto alcohols (eg, acetone, diacetone alcohol, etc.), ethers (eg, tetrahydrofuran, dioxane, etc.), polyalkylene glycols (eg, polyethylene glycol, polypropylene glycol, etc.), carbons having 2 to 6 alkylene groups Alkylene glycols containing atoms (eg, ethylene glycol, propylene glycol, butylene glycol, triethylene glycol, 1,2,6 hexane Triol, thiodiglycol, hexylene glycol, diethylene glycol, etc.), glycerin, lower alkyl ethers of polyhydric alcohols (ethylene glycol methyl ether, diethylene glycol methyl (or ethyl) ether, triethylene glycol monomethyl (or ethyl) ether, etc.)
And the like.

[0063] Among these many water-soluble organic solvents,
Polyhydric alcohols such as diethylene glycol and lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl (or ethyl) ether are preferred.

The content of the water-soluble organic solvent in the ink is generally in the range of 10 to 70% by mass based on the total mass of the ink.

It is preferable to add thermoplastic resin particles to the ink for the purpose of bonding to the recording medium and increasing the image strength on the recording medium. It is particularly preferable to coat the dispersed particles of the colorant with a thermoplastic resin. As a combination with a coloring agent, the thermoplastic resin particles, soluble dye system, disperse dye system, both can be suitably used in the dispersion pigment system,
The thermoplastic resin coat can be particularly suitably used for disperse dyes and disperse pigments. The melting point of the thermoplastic resin particles is preferably 30 ° C. or higher, more preferably 40 ° C. or higher, for stabilizing the liquid properties at room temperature. As the thermoplastic resin, for example, poly (meth) acrylic acid, polyethylene glycol, polyethylene, polypropylene, polyvinyl acetate, polyvinyl acetal, polymethacrylate, polyacrylate, polyether, polyester, polycarbonate, cellulose resin, Examples thereof include polyacrylonitrile, nylon, polyimide, polyamide, polyvinyl chloride, polyvinylidene chloride, polystyrene, thiochol, polysulfone, polyurethane, and copolymers of these resins. Among them, fine particles composed of poly (meth) acrylic acid, polyethylene glycol, polyethylene, polypropylene, polyvinyl acetate, polyvinyl chloride, nylon, polyurethane and the like are more preferably used. Fine particles formed by mixing two or more kinds of these materials may be used, or two or more kinds of fine particles may be mixed and used.

As the coating agent for the particles used in the coating of the thermoplastic resin, a conventionally known thermoplastic resin having a melting point of 40 ° C. or more can be used without any particular limitation, and more preferably a thermoplastic resin having a melting point of 50 ° C. or more. As, for example, acrylates, methacrylates, styrenes, styrene-acrylic copolymers, styrene-butadiene copolymers, acrylonitrile-butadiene copolymers,
Homopolymerization or copolymerization resin such as polybutadiene, vinyl acetate, polyvinyl chloride, polyvinylidene chloride, ethylene-vinyl acetate copolymer olefin and monomers having hydrophilic functional groups such as amino group, amide group, carboxyl group, hydroxyl group, etc. Emulsion, microemulsion, internal 3
Examples include dimensionally crosslinked organic fine particles, natural / synthetic wax emulsions such as paraffin wax, polyethylene wax, and carnauba wax, latex, colloid solutions, suspensions and the like.

Next, a recording medium for recording the final image will be described. As the support used for the recording medium, a conventionally known support can be used without particular limitation. The thickness is preferably from 6 to 200 μm, and more preferably from 25 to 125 μm.

As the support, for example, paper, coated paper,
Various papers such as synthetic paper (polypropylene, polystyrene, or a composite material obtained by laminating them with paper), vinyl chloride resin sheet, ABS resin sheet, polyethylene terephthalate film, polybutylene terephthalate film, polyethylene naphthalate film, polyarylate Single layer of film, polycarbonate film, polyetherketone film, polysulfone film, polyethersulfone film, polyetherimides film, polyimide film, polyethylene film, polypropylene film, polystyrene film, stretched nylon film, polyacetate film, etc. Plastic films or sheets formed by laminating two or more layers, films or sheets formed of various metals, or various ceramics. I made a film or sheet, further, aluminum, stainless steel, chromium, metal plate such as nickel, followed by a metal thin film to the paper was resin coated and laminated or deposited. Of these, paper is preferred from the viewpoint of preventing bleeding due to absorption of the ink solvent overflowing from the ink absorbing layer.

These supports may be subjected to various processes such as dimensional stabilization and antistatic treatment. Examples of the antistatic agent include cationic surfactants, anionic surfactants, nonionic surfactants, polymer antistatic agents, conductive fine particles, and “11290 Chemical Products”, Chemical Daily, 87
The compounds described on pages 5 to 876 and the like can be widely used. Further, conventionally known surface modification techniques can also be suitably used.

The surface layer formed on the base paper is mainly formed of a pigment and a binder. As the pigment constituting the surface layer, conventional inorganic pigments and organic pigments generally used can be used. Silica, aluminum oxide, which is more excellent in terms of the adsorption performance of the dye in the ink,
It is desirable to use at least one selected from basic magnesium carbonate as the main pigment. In addition, when it is required to prevent discoloration indoors and to maintain the storage stability of the multicolored recorded matter, it is particularly preferable to use basic magnesium carbonate as the main pigment. In the formation of the surface layer, as a binder that can be used, for example, conventionally known water-soluble polyvinyl alcohol, starch, oxidized starch, cationized starch, casein, carboxymethyl cellulose, gelatin, hydroxyethyl cellulose, acrylic resin and the like One or more of water-dispersible polymers such as polymers and SBR latex and polyvinyl acetate emulsion are used as a mixture. In the present invention, a preferable ratio of the pigment and the binder used is a pigment / binder (P
/ B) is in the range of 10/1 to 1/4, more preferably 6 /
When the amount of the binder is larger than 1/4, the ink absorbency of the surface layer is reduced.
If the amount of the pigment is more than 1, the powder on the surface layer is drastically dropped, which is not preferable.

In preparing the recording medium, a pigment,
An aqueous coating solution containing a binder and other additives, a known method, for example, a roll coater method, a blade coater method, an air knife coater method, a gate roll coater method,
Coating on the surface of the base material by size press method or the like. afterwards,
For example, drying is performed using a hot-air drying furnace, a hot drum, or the like, and a recording medium is obtained. Further, a super calender treatment may be performed to smooth the surface of the surface layer or to increase the surface strength of the surface layer. Further, in the present invention, a dye fixing agent (waterproofing agent), a fluorescent whitening agent, a surfactant, an antifoaming agent, a pH adjuster, a fungicide, an ultraviolet absorber, an antioxidant, An additive such as a dispersant and a viscosity reducing agent may be contained. These additives may be arbitrarily selected from conventionally known compounds according to the purpose.

The coating amount of the surface layer of the recording medium is a coating amount of an extent defined as the surface layer, and is about 0.5 to 20 μm as the maximum thickness in the cross-sectional direction. Here, the maximum thickness is the maximum value of the thickness in the depth direction of the surface layer in the cross section of the recording medium. Preferably, the recording medium in which a part of the base material is exposed to the surface layer, that is, when the base material is paper, the pulp fibers of the paper are mixed with the pigment on the surface of the surface layer. In a multicolor recording method in which a large amount of ink is applied, it is a desirable aspect from the viewpoint of ink absorptivity, particularly when the recording medium is a recording medium.

Further, printing paper can be used as the recording medium,
A conventionally known printing medium can be used. For example, various types of paper / synthetic paper can be used without any particular limitation.

[0074] the paper, coated paper, there is a non-coated paper, the coated paper, 1 m ² per coated amount on one side 20 g / m ² before and after art paper, coated amount per 1 m ² is one side 10g / m ² before and after the coated paper, 1m ² per coated amount on one side 5g / m ² before and after the light-weight coated paper, Binurikoshi, mat coated paper matte finish, Darukoto paper of dull finish, newspaper Examples include paper. As uncoated paper, printing paper A using 100% of chemical pulp, printing paper B using 70% or more of chemical pulp, printing paper C using 40% or more of less than 70% of chemical pulp, printing using less than 40% of chemical pulp Paper D,
Gravure paper containing mechanical pulp and calendered can be used. Further details are described in "Latest Paper Processing Handbook", edited by the Paper Processing Handbook Editing Committee, published by Tech Times, "Printing Engineering Handbook", edited by The Printing Society of Japan, etc.

[0075]

EXAMPLES The present invention will be described more specifically with reference to examples, but the present invention is not limited to the forms in the examples.

FIG. 1 is a schematic view of a transfer type recording apparatus that can be used in the present invention. In FIG. 1, a transfer type inkjet recording medium 1 is driven to rotate via a ring-shaped gear (not shown) provided at one end. The transfer type ink jet recording medium 1 includes a support 2, an elastic layer 3, a porous layer 4 and a surface layer 5. The surface layer 5 is a layer that does not absorb ink.

The transfer type recording apparatus includes a recording head 7 as a recording image writing means, a drying zone 9, a fixing roller 8 as a recording image fixing means, and a transfer medium reproducing means, which are arranged around the periphery in order from the upper side in the rotation direction. And a cleaning unit 6 as means.

The ink jet image formed by the recording head 7 corresponds to the porous layer 4 of the transfer type ink jet recording medium 1.
After being rotated in the direction of the arrow and dried in the drying zone 9, the image is transferred to a desired recording medium 10 by the fixing roller 8 and discharged in the direction of the arrow to obtain a target image.

In the ink receiving sheets obtained in Examples and Comparative Examples, the average pore diameter, porosity, and void width were evaluated as follows.

[Average pore diameter and porosity] In an electron microscope surface photograph taken at a magnification of 5000 times, 2 cm × 2 cm
The three arbitrary points were processed by an image processing apparatus, the hole diameters were measured with each hole being a perfect circle, and the average was determined to obtain an average hole diameter.

The porosity (%) was calculated by the formula (total area of holes / measured area) × 100. [Void width] In an electron microscope cross-sectional photograph taken at a magnification of 100 times, the width of 10 voids was determined by measuring and averaging the widths of the 10 voids.

Example 1 Polyether sulfone (“Sumika Excel 5200”)
P "(manufactured by Sumitomo Chemical Co., Ltd.) and 35 parts by mass of polyethylene glycol (# 200) were added to 65 parts by mass of a 20% by mass dimethyl sulfoxide solution while stirring well to prepare a dope. This dope was treated with a polyester nonwoven fabric (manufactured by Japan Vilene Co., Ltd., “MF-180K”, average fiber diameter 1).
5 μm, basis weight 180 g / m ² , thickness 200 μm, fiber density 900 kg / m ³ , air permeability 2.0 cm ³ / cm ² · s
ec), coating the dried porous film so as to have a thickness of 150 μm, leaving it to stand at 25 ° C. and 60% RH for 30 seconds, and immersing it in a coagulation bath filled with water at 40 ° C. for 2 minutes. , Phase change. Further, the sheet was dried for about 1 minute under blowing at room temperature (about 20 ° C.) to obtain a sheet. The porous membrane has a dense layer on the surface and voids extending in the thickness direction on the substrate side, the average pore diameter on the surface is 0.3 μm, the porosity on the surface is 48.2%, and the void width Was 13 μm. After adhering ethylene tetrafluoride to the surface side of the obtained sheet, it is adhered to a cylindrical support made of silicon rubber to form an intermediate transfer drum, and a recess of 1 μm or more with respect to the center plane height is 700 μm.
Pieces / m ² were pressed against an imprinting drum spread on the outside of the substrate, and protrusions of 1 μm or more
A surface shape of 0 / mm ² was obtained.

Example 2 18% by mass dimethyl sulfoxide solution of a polyacrylonitrile polymer (acrylonitrile content: 85 mol%) 9
To 0 parts by mass, add 10 parts by mass of water with good stirring,
A dope was prepared. This dope was applied to the same polyester nonwoven fabric as in Example 1 so that the thickness of the porous layer was 100 μm, left at 20 ° C. and 90% RH for 10 seconds, and then filled with water at 50 ° C. It was immersed in a coagulation bath for 2 minutes and the phase was changed. Further, the ink was dried for about 1 minute under blowing at room temperature (about 20 ° C.) to obtain an ink image receiving sheet. The porous film of the obtained ink image receiving sheet has a dense layer on the surface, has voids extending in the thickness direction on the substrate side, the average pore diameter of the surface is 0.7 μm, and the porosity of the surface is 50.6
%, Void width was 54 μm. A stainless steel mesh (pore diameter: 0.1 μm) was adhered to the surface layer of the obtained sheet, and then pressed with the forming drum used in Example 1 to make a 1 μm
A surface shape of 700 protrusions / mm ² or more was obtained.

Example 3 To 60 parts by mass of a 30% by mass dimethyl sulfoxide solution of cellulose acetate (average acetylation degree: 60.5, viscosity average polymerization degree: 260), 40 parts by mass of ethylene glycol were added with good stirring, and the dope was added. Prepared. This dope was prepared in Example 1.
To a non-woven polyester fabric as described above, so that the thickness of the porous layer after drying becomes 100 μm,
After being left for 30 seconds under the condition of H, it was immersed in a coagulation bath filled with water at 40 ° C. for 2 minutes to perform phase change. Further, the ink was dried for about 1 minute under blowing at room temperature (about 20 ° C.) to obtain an ink image receiving sheet. The porous film of the obtained ink receiving sheet has a dense layer on the surface, has voids extending in the thickness direction on the substrate side, the average pore diameter of the surface is 0.8 μm, and the porosity of the surface is 42.4%, and the void width was 59 μm.
After gluing ethylene tetrafluoride to the surface side of the obtained sheet, it is glued to a cylindrical support made of silicon rubber to form an intermediate transfer drum, and 8000 hollows of 1 μm or more with respect to the center plane height are formed. / Mm ² was pressed against a forming drum spread on the outside of the base material to obtain a surface shape in which 8000 protrusions of 1 μm or more were 8000 / mm ² .

Example 4 Cellulose acetate (average acetylation degree 55, viscosity average polymerization degree 17)
0) to 100 parts by mass of a 8% by mass methyl cellosolve solution,
13.7 parts by mass of 4-methylcyclohexanol was added to prepare a dope. This dope was applied to the same polyester nonwoven fabric as in Example 1 and the thickness of the porous film after drying was 50%.
μm, and dried at 40 ° C. and 90% RH for 10 minutes to obtain an ink image receiving sheet. The average pore diameter of the porous film surface of the obtained ink image receiving sheet is 0.2 μm,
The porosity was 39.3%, but no voids were formed. After gluing ethylene tetrafluoride to the surface side of the obtained sheet, it is glued to a cylindrical support made of silicon rubber to form an intermediate transfer drum, and 8000 hollows of 1 μm or more with respect to the center plane height are formed. / Mm ² is pressed against a mold drum spread on the outside of the substrate,
A surface shape having 8000 projections / mm ^{2 of} 1 μm or more was obtained.

Comparative Example 1 An ink receiving sheet was produced in the same manner as in Example 4. Profit
Adhesive sheet to a silicone rubber tubular support
Form an intermediate transfer drum, 1μm or more with respect to the center plane height
15,000 hollows / mm^TwoProcessed to be
The aluminum plate is pressed against the molding drum spread on the outside of the base material,
15000 projections / mm or more ^TwoSurface shape
Shape.

Comparative Example 2 An ink image-receiving sheet was prepared in the same manner as in Example 1, except that the concentration of the dimethyl sulfoxide solution of polyether sulfone was changed to 15% by mass. The obtained ink image receiving sheet had no holes on the surface. After adhering ethylene tetrafluoride to the surface side of the obtained sheet, it is adhered to a cylindrical support made of silicon rubber to form an intermediate transfer drum, and 300 hollows of 1 μm or more with respect to the center plane height are formed. the processed aluminum plate so that the mm ² and typed drum and pressure which were plated on the outside of the substrate, to obtain a surface profile 1μm or more protrusions of 300 pieces / mm ^2.

Example 5 40 parts by mass of ethylene glycol was added to 60 parts by mass of a 30% by mass dimethyl sulfoxide solution of cellulose acetate (average degree of acetylation: 60.5, viscosity average degree of polymerization: 260) while stirring well. Prepared. This dope was prepared in Example 1.
To a non-woven polyester fabric as described above, so that the thickness of the porous layer after drying becomes 100 μm,
After being left for 30 seconds under the condition of H, it was immersed in a coagulation bath filled with water at 40 ° C. for 2 minutes to perform phase change. Further, the ink was dried for about 1 minute under blowing at room temperature (about 20 ° C.) to obtain an ink image receiving sheet. The porous film of the obtained ink receiving sheet has a dense layer on the surface, has voids extending in the thickness direction on the substrate side, the average pore diameter of the surface is 0.8 μm, and the porosity of the surface is 42.4%, and the void width was 59 μm.
The obtained sheet was adhered to a cylindrical support made of silicone rubber to form an intermediate transfer drum, and an aluminum plate processed so that the number of depressions of 1 μm or more with respect to the center plane height was 3000 / mm ^2. Pressing the molding drum spread on the outside of the material,
A surface shape having 3,000 protrusions / mm ^{2 of} 1 μm or more was obtained.

<Image Formation> In the ink jet transfer type recording apparatus shown in FIG. 1, the transfer type ink jet recording medium 1 was 24 cm in diameter. Using a recording head 7 having a nozzle of 720 dpi (dpi represents the number of dots per inch, that is, 2.540 cm), the dye ink is ejected from the recording head to attach the dye ink to the porous layer 4. The dye ink held by the porous layer 4 is pressed against the recording medium 10 (manufactured by Tokishi Art Mitsubishi Paper Mills) at a linear pressure of 8 kg / cm, and the dye ink of the porous layer 4 is pressed onto the recording medium. Transferred to No. 10. As the ink, a commercially available inkjet ink was used.

The obtained images were evaluated by the following methods, and the results are shown in Table 1. [Evaluation of bleeding] The bleeding of the final image was visually evaluated. ○: No bleeding Δ: Slightly bleeding X: Bleeding.

[Evaluation of dirt] Dirt when different images were continuously used was visually evaluated. ○: No dirt was generated. Δ: Slight dirt was found in the non-image part.

[Density] The density was measured using a colorimeter (Spectrolino, keywiz, manufactured by Gretag Macbeth).
ard) under the following conditions.

Light source: D50 Field of view: 2 ° field of view Density: ANSI T White standard: abs Filter: No-filter

[0094]

[Table 1]

As shown in Table 1, the present invention has a high concentration,
Stain and less bleeding were obtained.

[0096]

According to the present invention, a transfer type ink jet recording medium having an appropriate range of surface roughness can be obtained, and a clear image can be reliably transferred by using the transfer type ink jet recording medium. A recording method and an image forming method can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a transfer type recording apparatus that can be used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transfer-type inkjet recording medium 2 Support 3 Elastic layer 4 Porous layer 5 Surface layer 6 Cleaning unit 7 Recording head 8 Fixing roller 9 Dry zone 10 Recording medium

Claims (11)

[Claims] 1. A projection having a height of 1 to 10 μm on a surface,
A transfer-type ink jet recording medium having a density of from 00 to 12000 pieces / mm ² . 2. The transfer type ink jet recording medium according to claim 1, wherein the surface layer contains a material that does not absorb ink. 3. The transfer type ink jet recording medium according to claim 1, wherein the surface layer has a function of increasing the viscosity of the ink. 4. The transfer type ink jet recording medium according to claim 1, comprising at least three layers. 5. The transfer type inkjet recording medium according to claim 1, further comprising an elastic intermediate layer. 6. The transfer type inkjet recording medium according to claim 1, further comprising a porous intermediate layer. 7. A transfer type ink jet recording medium, wherein the surface layer is a dense layer of a porous film. 8. A transfer type ink jet recording medium wherein the surface layer is a dense layer of a porous film, and the surface layer contains a material which does not absorb ink. 9. The transfer type ink jet recording medium according to claim 6, wherein the surface layer is a dense layer of a porous film, and the surface layer contains a material which does not absorb ink. 10. The transfer type ink jet recording medium according to claim 1, wherein the print density of the ink is 5 to 10.
An ink jet recording method characterized by recording at ²⁰ nl / mm ² . 11. An image forming method using the transfer type ink jet recording medium according to claim 1.