JP2000043405A - INK JET RECORDING MEDIUM AND ITS MANUFACTURING METHOD - Google Patents

Abstract

(57) [Summary] First of all, it is required to simultaneously satisfy the wettability and the dyeing property of the ink, as well as the water resistance property, and particularly, the transparency is required as represented by an OHP sheet. Having sufficiently high transparency for the application,
Further, the present invention provides an ink jet recording medium satisfying these conditions, in which the image quality is not deteriorated and the image quality is not deteriorated despite the crosslinking when forming the ink image receiving layer. The ink image receiving layer contains a copolymer containing at least three of a hydrophobic monomer, a cation-modified acrylic monomer and diacetone acrylamide as a monomer component. It is characterized in that a dicarboxylic acid dihydrazide is added to the union, and the mixture is cured by heating on a substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium for an ink jet printer and, more particularly, to a recording medium which simultaneously satisfies both wettability and absorbability to ink and water resistance.

[0002]

2. Description of the Related Art In recent years, various types of printers for computer output have become widespread. Above all, an ink jet printer is excellent in quietness, cost, and image quality, can reproduce a full-color image with high quality, has excellent performance not found in other systems, and can be expected to spread further. On the other hand, paper is often used for printer paper, and plastic films and synthetic papers are also used for applications requiring smooth images utilizing their smooth surface and transparency.

[0003] Ink-jet inks include:
In order to prevent clogging of the ink nozzle, a slow-drying ink in which a water-soluble dye or the like is dissolved in an aqueous solvent is used. Therefore,
Good if the recording paper is water-absorbent, such as paper, but if it is non-water-absorbing such as a plastic film, the ink will have poor drying properties after printing. An image receiving layer is provided.

However, a structure in which an ink image-receiving layer is provided on a support such as a plastic film has not been obtained with sufficient performance. That is, in order to improve the wettability and dyeability of the slow-drying ink, or to improve the absorbability, a method in which the ink image-receiving layer is composed of a water-soluble resin or a hydrophilic resin has been proposed. By the aqueous solvent,
Alternatively, the ink image receiving layer becomes wet and sticky in a highly humid environment, or blocking when a recording medium is stacked,
In addition, there is a problem that drying is poor and soiling is easy if touched by hand after printing. Properties such as wettability, dyeing properties, and absorbency and properties such as water resistance, drying property and blocking resistance are mutually contradictory properties, and properties satisfying these simultaneously have not yet been obtained. Absent.

[0005]

According to the prior art, an ink jet recording medium using such a non-water-absorbing support has a satisfactory performance even if the ink receiving layer and the like are modified. Was not obtained. The present invention has been made in view of the problems with such conventional technology, the purpose is to be able to simultaneously satisfy the water resistance properties, along with the wettability and dyeing properties of the ink, It is still another object of the present invention to provide an ink jet recording medium having sufficiently high transparency especially for applications requiring transparency, as represented by an OHP sheet, and a method of manufacturing the same.

[0006]

Means for Solving the Problems The present invention has been made to achieve the above object, and the invention as set forth in claim 1 is to provide at least one surface of a substrate with at least a hydrophobic monomer as a monomer component. An ink image receiving layer using a copolymer resin composed of a cation-modified acrylic monomer and diacetone acrylamide, and at least a hydrophobic monomer as a monomer component, a cation-modified acrylic monomer, and a copolymer resin composed of diacetone acrylamide and fine particles. An ink jet recording medium characterized in that the used protective layer is laminated in this order.
This makes it possible to obtain excellent performance in ink absorption and ink fixability, and particularly excellent cyan fixability, which is usually difficult to fix. In addition, the provision of the protective layer containing the fine resin particles is effective in improving printed images, drying properties, and preventing blocking.

According to a second aspect of the present invention, based on the constitution of the ink jet recording medium of the first aspect, the fine particles contained in the protective layer are substantially spherical, and have an average particle diameter of 0.1.
An ink jet recording medium characterized by being 10 μm to 10 μm insoluble in either water or alcohols. According to this, the particle size of the fine particles is 0.1
When the thickness is from 10 to 10 μm, the effect on the blocking resistance is large. If the particle size of the fine particles is less than 0.1 μm, the effect on blocking resistance is small, and 10 μm
When it exceeds, transparency is reduced.

According to a third aspect of the invention, based on the constitution of the ink jet recording medium according to the first or second aspect, the proportion of the fine particles in the protective layer is determined by using the copolymer resin used in the protective layer. 1 to 20% by weight of the ink jet recording medium. According to this, if the added amount of the fine particles is less than 1% by weight, the effect on the drying property and the blocking resistance of the medium is small, and if it exceeds 20% by weight, the transparency is remarkably reduced.

According to a fourth aspect of the present invention, the dry thickness of the protective layer is 0.5 to 2 μm based on the constitution of the ink jet recording medium according to any one of the first to third aspects. It is a recording medium. If the thickness of the protective layer is less than 0.5 μm, the effect on the drying properties and blocking resistance of the medium is reduced, and if it exceeds 2 μm, the transparency is undesirably reduced.

According to a fifth aspect of the present invention, based on the constitution of the ink jet recording medium according to any one of the first to fourth aspects, the fine particles have a refractive index in a range of 1.45 to 1.55, In addition, the present invention provides an ink jet recording medium using an organic resin. According to this, the transparency of the protective layer coating film is good. If the refractive index is 1.45
If the ratio is not in the range of 1.55, the decrease in transparency becomes more and more remarkable, which is not preferable.

According to a sixth aspect of the present invention, based on the configuration of the ink jet recording medium according to any one of the first to fifth aspects, the fine particles have a hydrogen ion concentration within a range of 4.0 to 7.5. And an ink jet recording medium characterized by using an inorganic material. According to this, the dispersibility of the inorganic fine particles in the copolymer resin is good. If the hydrogen ion concentration exceeds 7.5, the inorganic fine particles aggregate and precipitate in the coating solution, and if the hydrogen ion concentration is less than 4.0, an image is formed on the formed ink jet recording medium by ink jet. In this case, it is not preferable because the hue may be changed.

According to a seventh aspect of the present invention, based on the configuration of the ink jet recording medium according to any one of the first to sixth aspects, the ink image-receiving layer and the protective layer are formed of any one of the copolymer resins used for these. Alternatively, both are ink-jet recording media in which dicarboxylic acid dihydrazide is added and then heat-cured. According to this, the addition of dicarboxylic acid dihydrazide causes a cross-linking reaction with the carbonyl group of diacetone acrylamide in the resin unit, thereby realizing complete water resistance of the coating film. In addition, the conventional crosslinking agent increases the hydrophobicity of the resin itself in proportion to the amount added, and remarkably adds image quality. However, the present invention is excellent because no deterioration in image quality due to crosslinking is observed.

[0013] The invention according to claim 8 is to provide a coating for an ink image receiving layer in which a copolymer resin comprising at least a hydrophobic monomer, a cation-modified acrylic monomer, and diacetone acrylamide as a monomer component is liquefied using a suitable solvent. A working liquid is applied to at least one surface of the substrate and then heated and cured to form an ink image receiving layer, and then at least a hydrophobic monomer as a monomer component,
Coating a copolymer resin composed of a cation-modified acrylic monomer and diacetone acrylamide with an appropriate solvent to form a coating liquid and apply a coating liquid for a protective layer obtained by adding fine particles to the coating liquid on the ink image receiving layer. And forming a protective layer by heating and curing after the formation. For example, this makes it possible to obtain excellent performance in ink absorption and ink fixability, particularly excellent in cyan fixability, which is usually difficult to fix, and by providing a protective layer containing fine resin particles, a printed image, It is possible to manufacture an excellent ink jet recording medium that is effective in improving drying properties and preventing blocking.

According to a ninth aspect of the present invention, there is provided a method for coating an ink image receiving layer in which a copolymer resin comprising at least a hydrophobic monomer, a cation-modified acrylic monomer, and diacetone acrylamide as a monomer component is liquefied using a suitable solvent. A working liquid is applied to at least one surface of the substrate, and then at least a hydrophobic monomer as a monomer component,
A cationically modified acrylic monomer, and a copolymer resin composed of diacetone acrylamide is coated with an appropriate solvent into a coating liquid, and a coating liquid for a protective layer obtained by adding fine particles to the coating liquid is used for the coated ink image receiving layer. A method for producing an ink jet recording medium, characterized in that an ink image receiving layer and a protective layer are formed by coating on a coating liquid and then heating and curing these. For example, by this, it is possible to obtain a performance excellent in ink absorption and ink fixability, and particularly excellent in cyan fixability, which is usually difficult to fix, and by providing a protective layer containing fine resin particles, a printed image is provided. It is possible to manufacture an excellent ink jet recording medium which is effective in improving drying properties and preventing blocking.

According to a tenth aspect of the present invention, there is provided a method of manufacturing an ink jet recording medium according to any one of the eighth and ninth aspects, wherein the coating liquid for the ink image receiving layer and the coating liquid for the protective layer are separated. Is a method for producing an ink jet recording medium, characterized in that dicarboxylic acid dihydrazide is added to one or both of them. according to this,
The addition of dicarboxylic acid dihydrazide causes a cross-linking reaction with the carbonyl group of diacetone acrylamide in the resin unit, thereby realizing complete water resistance of the coating film. In addition, the conventional crosslinking agent increases the hydrophobicity of the resin itself in proportion to the amount added, and remarkably adds image quality. However, the present invention is excellent because no deterioration in image quality due to crosslinking is observed.

[0016]

In order to solve the above-mentioned problems, the ink jet recording medium of the present invention comprises at least one surface of a substrate comprising at least a hydrophobic monomer, a cation-modified acrylic monomer, and diacetone acrylamide as monomer components. One having an image receiving layer containing a copolymer resin as an essential component has a basic structure.

In the above ink jet recording medium, an ink image receiving layer made of the copolymer resin and a protective layer containing the copolymer resin and fine particles are sequentially laminated to form an ink jet recording having excellent image quality and excellent drying properties of the ink. They have found that a medium can be obtained and have completed the present invention.

The ink image receiving layer in the present invention is a layer that receives ink. In the present invention, by using a specific resin for the layer, image quality, ink dyeing property and wettability can be improved.
Balances water resistance. As such an ink image receiving layer, a hydrophobic monomer, a cation-modified acrylic monomer,
It is composed of a copolymer resin composed of diacetone acrylamide. For dyeing the ink, a cation-modified acrylic monomer and an amide-based acrylic monomer are effective. In the present invention, by using diacetone acrylamide as the amide-based acrylic monomer, excellent image quality and complete water resistance can be imparted by obtaining a crosslinked structure that retains hydrophilicity in combination with a dihydrazide compound. In addition, it has been found that providing a protective layer comprising the copolymer resin and the fine particles on the ink image receiving layer can impart more excellent ink absorbency and image quality than those having a single-layer structure.

The hydrophobic monomer described in the present invention is preferably a polymer whose homopolymer exhibits hydrophobicity.
For example, various acrylic acid esters, methacrylic acid esters, styrene monomers and derivatives thereof can be mentioned. Above all, methyl methacrylate and styrene monomer have high hydrophobicity and high Tg of the homopolymer, so that it is possible to synthesize a copolymer resin having good physical properties, and its use is preferred.

The cation-modified acrylic monomer described in the present invention is an acrylic monomer having a quaternary ammonium base, such as (meth) acryloyloxytrimethylammonium chloride, (meth) acroyloxytrimethylammonium bromide, (meth) acrylic acid. Acroyloxytrimethylammonium iodide, (meth) acryloyloxydimethylmethylammonium sulfate, (meth) acryloyloxydimethylethylammonium sulfate, (meth) acroyloxyhydroxypropyltrimethylammonium acetate,
(Meth) acrylamidopropyltrimethylammonium chloride, (meth) acrylamidopropyltrimethylammonium bromide, (meth) acrylamidopropyltrimethylammonium iodide, (meth)
Acrylamidopropyltrimethylammonium methylsulfate, (meth) acrylamidopropyltrimethylammonium p-toluenesulfonate, (meth)
Examples include acrylamidopropyltridimethylhydroxypropylammonium acetate, allyltrimethylammonium chloride, metachlorin chloride, metachlorin bromide, and metachlorin iodide, and mixtures thereof.

The amount of diacetone acrylamide described in the present invention is preferably one obtained by copolymerizing 5 to 30% by weight of all monomer components. The reason for this is that the diacetone acrylamide component acts on both image quality and curing by crosslinking, so that if the addition amount is less than 5% by weight,
The effects on both image quality and water resistance are small, and when it exceeds 30% by weight, the hydrophilicity of the copolymer resin is too increased, and it is difficult to achieve both water resistance and image quality even by crosslinking. More preferably, the range is 5 to 20% by weight.
If necessary, an acrylamide-based monomer other than diacetone acrylamide may be copolymerized for imparting hydrophilicity.

The cation-modified acrylic monomer described in the present invention is preferably added in an amount of 20 to 60% by weight of all the monomer components. The reason for this is that the cation-modified acrylic monomer contributes to water absorption and ink fixability. If the amount is less than 20% by weight, the effect is small, and if it is more than 60% by weight, the hydrophilicity is excessively increased. This is not desirable because it makes it difficult to maintain the physical properties of the coating film.

The dicarboxylic acid dihydrazide described in the present invention includes malonic dihydrazide, succinic dihydrazide, glutaric dihydrazide, adipic dihydrazide, pimelic dihydrazide, suberic acid dihydrazide, azelaic dihydrazide, sebacic dihydrazide, dodecanedidic dihydridide, dodecanedihydridide dihydrazide Dihydrazide and the like. These can be added in a predetermined amount, alone or as a mixture. Among them, adipic acid dihydrazide is particularly desirable because it has high reactivity, little deterioration in image quality due to crosslinking, and is relatively inexpensive due to industrial production.

The amount of the dicarboxylic acid dihydrazide described in the present invention is preferably 0.25 to 0.75 times the molar equivalent of the diacetone acrylamide. The reason for this is that dicarboxylic acid dihydrazide undergoes a cross-linking reaction with the active carbonyl group of the diacetone acrylamide component. Therefore, if the amount added is 0.25 times or less the molar amount of diacetone acrylamide, the water resistance effect of the cross-linking is reduced When the molar amount is 0.75 times or more, the amount of unreacted components increases, thereby deteriorating the image quality.

The fine particles to be filled in the protective layer described in the present invention include, for example, polymethyl methacrylate, polystyrene, vinyl resin such as fluororesin, polyolefin resin such as polyethylene and polypropylene, thermoplastic resin such as polyamide, Synthetic resin fine particles made of thermosetting resin such as polybenzoguanamine resin or urea resin, or natural polymer such as cellulose or starch-based fine particles, silica, clay, calcium carbonate, barium sulfate, alumina white, aluminum hydroxide, talc And inorganic fine particles such as silicic acid anhydride, hydrated silicic acid, hydrated calcium silicate, hydrated aluminum silicate and the like known as colloidal silica and bentonite, titanium oxide and the like, and alumina sol and the like.

Preferably, about 0.1 to 20% by weight is usually contained in the ink image receiving layer. If the content is too small, sufficient transportability and blocking resistance cannot be obtained. In the case of an application such as an OHP which requires a particularly transparent image, transparency is impaired if the content is too large, so that the content is preferably less than 10 wt%.

Each of the above image receiving resins is
It is used as a coating liquid of a 10 to 50% by weight solution using one or more mixed solvents of water, methanol, ethanol, isopropyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, toluene, xylene and the like.

In addition, the ink image-receiving layer may have, depending on the purpose,
Other resins other than the above, or a surfactant,
An ultraviolet absorber, an antioxidant, a pH adjuster, an antifoaming agent, and other additives may be appropriately mixed without departing from the performance.

The thickness of the ink image receiving layer is usually from 1 to 50 μm.
m, preferably about 3 to 20 μm. If the thickness is too small, the dyeing properties will be insufficient, and the drying property and the anti-blocking property will be reduced. Conversely, if the thickness is too large, the cost will increase and the curl will increase. The ink image-receiving layer is formed by coating a coating solution obtained by mixing the above-described base agent and curing agent at an appropriate equivalent ratio on at least one surface of the support by a known coating method such as gravure coating, roll coating, or wire bar coating. I just need to work.

By heating the ink image receiving layer of the present invention with a coater drier or the like after coating, the coating film can be three-dimensionally cured to impart complete water resistance. The heating temperature is not particularly specified, but is usually in the range of 90C to 120C.

Examples of the support for the ink jet recording medium include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyolefins such as polyethylene and polypropylene, polyvinyl chloride, polystyrene, polymethyl methacrylate, polycarbonate, cellophane, cellulose acetate, and polyarylate. A film or plate made of a resin such as polyether sulfone can be used. OHP for inkjet recording media
If it is intended for use, it is transparent, especially polyethylene terephthalate film, rigid polyvinyl chloride film,
Use a polypropylene film, a triacetate film, or the like. Also, a glass plate or the like can be used. On the other hand, OHP
If it is not a transparent image application such as a transparent image, an opaque support such as white may be used, and various papers such as synthetic paper, high-quality paper, art paper, coated paper, cast coated paper, and paperboard can also be used.

The thickness of the substrate is appropriately selected in consideration of the strength in accordance with the application and is not particularly limited.
It is about 0 μm. The surface of the substrate may be subjected to a corona discharge treatment or a known easy adhesion treatment such as an anchor layer made of a polyurethane resin or the like for the purpose of improving the adhesion of the ink image receiving layer provided on the surface.

The aqueous ink that can be used in the ink jet recording medium of the present invention is a known ink jet ink, and is usually a water-soluble dye, a wetting agent, a dye solubilizer, a preservative, water, and a water-miscible ink. It consists of an organic solvent and the like.

<Operation> As described above, in the ink jet recording medium of the present invention, in a recording medium including an image receiving layer provided on a base material, the image receiving layer comprises at least a hydrophobic monomer as a monomer component and a cation-modified acrylic. Ink image receiving layer formed by adding dicarboxylic acid dihydrazide to a copolymer resin composed of monomer and diacetone acrylamide, dissolving in an appropriate solvent, coating and heating and curing, and protection comprising the copolymer resin and fine particles. By sequentially laminating the layers, excellent image quality, wettability and dyeing properties as well as water resistance are simultaneously achieved.

The cation-modified portion of the acrylic copolymer resin to be cured and the diacetone acrylamide mainly have an ink absorbing property and a dyeing property, and have a property of being hardly soluble in water alone, and are further characterized by diacetone acrylamide and dicarboxylic dihydrazide. A complete water resistance of the resin is realized by a crosslinking reaction with the resin. In addition, the filled fine particles provide an ink absorption speed, and no stickiness occurs even when the ink is absorbed.

[0036]

The present invention will be described below more specifically with reference to examples and comparative examples. In the description, "parts" are based on weight and solids unless otherwise specified.

<Synthesis Example 1> In a four-necked flask equipped with a stirrer, a nitrogen inlet tube and a reflux condenser, 50 g of methyl methacrylate and 10 g of diacetone acrylamide were added.
g, methacrylamidopropyltrimethylammonium chloride (40 g) was introduced, ethanol (70 g) was added and dissolved, and the mixture was stirred on an oil bath under a nitrogen atmosphere. 0.2g to this
Of α, α′-azobisisobutyronitrile was added to initiate polymerization, and the mixture was heated and stirred in an oil bath at 60 ° C. for 5 hours to obtain a colorless and viscous polymer solution A.

<Synthesis Example 2> In a four-necked flask equipped with a stirrer, a nitrogen inlet tube and a reflux condenser, 45 g of methyl methacrylate and 15 g of diacetone acrylamide were added.
g, methacrylamidopropyltrimethylammonium chloride (40 g) was introduced, ethanol (70 g) was added and dissolved, and the mixture was stirred on an oil bath under a nitrogen atmosphere. 0.2g to this
The polymerization was started by adding α, α'-azobisisobutyronitrile of the formula (1), and the mixture was heated and stirred on an oil bath at 60 ° C for 5 hours to obtain a colorless and viscous polymer solution B.

<Synthesis Example 3> In a four-necked flask equipped with a stirrer, a nitrogen inlet tube and a reflux condenser, 35 g of methyl methacrylate and 10 g of diacetone acrylamide were placed.
g, methacryloyloxyethyltrimethylammonium methyl paratoluenesulfonate (55 g) was introduced, ethanol (70 g) was added to dissolve the mixture, and the mixture was stirred on an oil bath under a nitrogen atmosphere. Polymerization was started by adding 0.2 g of α, α'-azobisisobutyronitrile thereto, and the mixture was heated and stirred in a 60 ° C. oil bath for 6 hours to give a colorless and viscous polymer solution C. I got

<Synthesis Example 4> In a four-necked flask equipped with a stirrer, a nitrogen inlet tube, and a reflux condenser, 50 g of styrene monomer, 10 g of diacetone acrylamide, and 40 g of methacrylamidopropyltrimethylammonium chloride were introduced. Add 70 g and dissolve,
The mixture was stirred under a nitrogen atmosphere on an oil bath. 0.2g of α,
Polymerization was started by adding α′-azobisisobutyronitrile, and the mixture was heated and stirred on a 60 ° C. oil bath for 5 hours to obtain a colorless and viscous polymer solution D.

<Synthesis Example 5> In a four-necked flask equipped with a stirrer, a nitrogen inlet tube and a reflux condenser, 35 g of styrene monomer, 10 g of diacetone acrylamide, and 55 g of methacryloyloxyethyltrimethylammonium methyl paratoluenesulfonate. Introduce ethanol 7
0 g was added and dissolved, and the mixture was stirred on an oil bath under a nitrogen atmosphere.
The polymerization was started by adding 0.2 g of α, α'-azobisisobutyronitrile to this,
The heating and stirring were continued for an hour to obtain a colorless and viscous polymer solution E.

<Example 1> to <Example 10> The obtained polymer solution was prepared with an ink receiving layer composition shown in Table 1 and an appropriate amount of water and ethanol to prepare an ink receiving layer coating composition having a solid content of about 20%. did. Similarly, a protective layer coating composition having a solid content of about 5% was prepared using a suitable amount of water and ethanol with the protective layer composition shown in Table 1. 100μ as support
m is coated on a polyethylene terephthalate film (trade name: Lumirror E63S, manufactured by Toray Industries, Inc.) whose surface is easily treated by wire bar coating to obtain a film thickness of 15 μm after drying the ink image receiving layer coating composition. And dried in a dryer at 100 ° C. for 3 minutes. Further, after drying the protective layer coating composition, the film thickness is 1 μm.
m, and dried in a dryer at 100 ° C. for 3 minutes to obtain an inkjet recording medium.

<Comparative Example 1> to <Comparative Example 5> The obtained polymer solution was prepared with an ink receiving layer composition shown in Table 1 and an appropriate amount of water and ethanol to prepare an ink receiving layer coating composition having a solid content of about 20%. As a support, a polyethylene terephthalate film (trade name: Lumirror E63S, Toray Industries, Ltd.) having a surface with a thickness of 100 μm easily treated for adhesion.
Co., Ltd.), the resulting ink image receiving layer coating composition was applied by wire bar coating to a thickness of 15 μm after drying, and then dried in a drier at 100 ° C. for 3 minutes to obtain an ink jet recording medium.

[0044]

[Table 1]

[0045]

[Table 2]

<Medium evaluation> A Canon inkjet printer (product name;
BJC-420J), an image was formed with four color inks of yellow (Y), magenta (M), cyan (C), and black (K), and the medium was evaluated according to the following evaluation criteria. Table 3 shows the evaluation results.

[Ink Absorption] Immediately after printing, the transfer condition of the ink when the paper was overlaid on the recording portion of the recorded matter was evaluated. A: No transfer at all. ；: Slight transfer was observed, but the original image was not affected. Δ: Transfer was observed, which also affected the original image. ×: Transferred at a considerable rate.

[Ink Dyeing Property] The recording section was immersed in a vat filled with water for 3 minutes and then taken out. A: Ink hardly flows out. ；: The ink slightly leaked, but there was no significant change in color tone. Δ: Inflow of ink and change in color tone are observed. X: Most of the ink flows out.

[Resin Water Resistance] The unrecorded portion was immersed in a vat filled with water for 3 minutes, taken out, and immediately wiped lightly with gauze. A: There is almost no damage to the coating film. ；: The coating film is slightly damaged but has no practical problem. Δ: Part of the coating film is dissolved. ×: Most of the coating film is dissolved.

[Blocking Resistance] The degree of sticking when the PET film was superimposed on the recorded matter was evaluated. ◎: Does not stick. ；: Slightly adheres to the recording portion where the print density is high. Δ: Most of the recording portion is stuck. X: Sticking over the entire recorded portion and unrecorded portion.

[0051]

[Table 3]

[0052]

As described above, according to the present invention, all of the ink jet recording media were excellent in ink wettability and dyeing property, excellent in ink absorption, and excellent in water resistance. Further, by providing a protective layer containing fine particles, it was possible to improve the ink drying property and also the blocking resistance. Furthermore, because of its excellent transparency, it had excellent suitability for applications such as OHP films. That is, according to the present invention, it was possible to provide an ink jet recording medium which simultaneously satisfies the wettability, the dyeing property, the drying property and the water resistance of the ink, and also has excellent transparency, and a method for producing the same.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of an ink jet recording medium of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ink-jet recording medium 2 ... Support 3 ... Ink image receiving layer 4 ... Protective layer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C056 EA13 FB02 FC06 2H086 BA16 BA32 BA33 BA34 BA37 BA41 4D075 AE03 BB26Z CA35 DA04 DB18 DC27 EA02 EA05 EB22 EB39 EC07 EC24 EC53 EC54 4F100 AA01C AH03B AK01B26 AK01B26 AK01B26 AL06C AT00A BA03 BA10A BA10C BA13 DE01C DE04C EA062 EG002 EH112 EH462 EJ08 EJ082 EJ42 EJ422 EJ86C EJ91C GB90 JA20C JB04 JB06B JB06C JB07 JB09C JB11C JD14 JD14B JN01 JN18C

Claims (10)

[Claims] 1. An ink receiving layer comprising at least one surface of a base material using a copolymer resin of at least a hydrophobic monomer, a cation-modified acrylic monomer and diacetone acrylamide as a monomer component, and at least a hydrophobic monomer as a monomer component An ink jet recording medium comprising: a protective layer using a copolymer resin of cation-modified acrylic monomer, diacetone acrylamide, and fine particles, in this order. 2. The method according to claim 1, wherein the fine particles are substantially spherical, have an average particle size of 0.1 to 10 μm, and are insoluble in either water or alcohols. The ink-jet recording medium according to the above. 3. The ratio of the fine particles in the protective layer is as follows:
3. The ink jet recording medium according to claim 1, wherein the amount is 1 to 20% by weight based on the copolymer resin used for the protective layer. 4. The protective layer has a dry thickness of 0.5 to 2 μm.
The inkjet recording medium according to any one of claims 1 to 3, wherein 5. The fine particles have a refractive index of 1.45 to 1.45.
The inkjet recording medium according to any one of claims 1 to 4, wherein the range is 1.55 and an organic resin is used. 6. The fine particles have a hydrogen ion concentration of 4.
The inkjet recording medium according to any one of claims 1 to 5, wherein the inkjet recording medium is in a range of 0 to 7.5 and uses an inorganic material. 7. The ink image receiving layer and the protective layer are characterized in that one or both of the copolymer resins used for these are heat-cured after addition of dicarboxylic dihydrazide. The ink jet recording medium according to any one of claims 1 to 6. 8. A coating liquid for an ink image-receiving layer obtained by coating a copolymer resin comprising at least a hydrophobic monomer, a cation-modified acrylic monomer, and diacetone acrylamide as a monomer component with an appropriate solvent, An ink image receiving layer is formed by heating and curing after coating on at least one surface, and then a copolymer resin comprising at least a hydrophobic monomer, a cation-modified acrylic monomer, and diacetone acrylamide as a monomer component is mixed with an appropriate solvent. Ink jet recording comprising forming a protective layer by applying a coating liquid for a protective layer to which a coating liquid is added and adding fine particles to the ink image-receiving layer, followed by heating and curing. The method of manufacturing the medium. 9. A coating solution for an ink image receiving layer obtained by coating a copolymer resin comprising at least a hydrophobic monomer, a cation-modified acrylic monomer, and diacetone acrylamide as a monomer component using a suitable solvent, Coating on at least one surface, then, as a monomer component, at least a hydrophobic monomer, a cation-modified acrylic monomer, and a copolymer resin consisting of diacetone acrylamide using a suitable solvent to form a coating liquid and apply fine particles thereto. Coating the added coating liquid for a protective layer onto the coated coating liquid for an ink image receiving layer, and then heating and curing these to form an ink image receiving layer and a protective layer. A method for producing an ink jet recording medium, comprising: 10. The method according to claim 8, wherein a dicarboxylic acid dihydrazide is added to one or both of the coating liquid for the ink image receiving layer and the coating liquid for the protective layer. The method for producing an ink jet recording medium according to any one of the above.