JP2000103162A - Ink jet recording medium and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance wettability, a dyeing property, dryness, water resistance, and the like by laminating on the surface of a base material an acceptable layer including diacetone (meth)acrylamide as an essential component heat- hardened in a copolymeric resin component and a protection layer consisting of a copolymeric resin thermosetting substance and minute grains. SOLUTION: At least one surface of a base material as a support body 2 is laminated by the turn with an ink acceptable layer 3 as a fundamental structure containing diacetone (meth)acrylamide as an essential component in a copolymeric resin component and heat-hardened by carboxylic acid dihydrazine, and a protection layer containing the copolymeric thermosetting substance and minute grains. An addition quantity of diacetone (meth)acrylamide is made 5-40 wt.% in the total quantity of a monomer component, and an addition quantity of carboxylic acid dihydrazine is equivalent to mols of 0.02-0.50 times with respect to a molar quantity of diacetone (meth)acrylamide. The thickness of an ink acceptable layer is made of the order of 1-50 μm usually to subsequently be heated by the dryer of a coater after coating.

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. A receiving layer is provided.

However, a structure in which an ink 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 of forming the ink receiving layer from a water-soluble resin, a hydrophilic resin, or the like has been proposed. By the aqueous solvent,
Alternatively, the ink receiving layer becomes wet and tacky in a high-humidity environment, and blocking occurs when recording media are 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 above-mentioned problems of the conventional technology. The first object of the present invention is to simultaneously satisfy the wettability and dyeing properties of the ink and the water resistance of the ink receiving layer. The second object is to have a sufficiently high transparency especially for an application requiring transparency, as represented by an OHP sheet. Further, the object of the present invention is to obtain an extremely excellent image quality without deteriorating the image quality despite the crosslinking when forming the ink receiving layer. To provide.

[0006]

Means for Solving the Problems The present invention has been made to achieve the above object, and the invention according to claim 1 has at least one surface of a base material having at least one surface in a copolymer resin component. An ink-receiving layer containing diacetone (meth) acrylamide as an essential component and cured by heating with carboxylic acid dihydrazide, and a protective layer composed of the thermosetting copolymer resin and fine particles are laminated in this order. An ink jet recording medium characterized in that: This makes it possible to obtain excellent performance in ink absorption, ink fixability, and water resistance, and particularly excellent cyan fixability, which is usually difficult to fix. In addition, the provision of the protective layer containing fine particles is effective in improving printed images, drying properties, and preventing blocking.

According to a second aspect of the present invention, in the ink jet recording medium of the first aspect, the fine particles contained in the protective layer are spherical and have an average particle size of 0.01 to 30 μm.
And insoluble in water or alcohols. According to this, the particle size of the fine particles is 0.0
When the thickness is 1 to 30 μm, the effect of preventing blocking is large. If the particle size of the fine particles is less than 0.01 μm, the anti-blocking effect is small, and if it is larger than 30 μm, the transparency is significantly reduced.

[0008] The invention described in claim 3 is claim 1 or 2.
3. The ink jet recording medium according to claim 1, wherein the fine particles of the protective layer are organic fine particles having a refractive index of 1.45 to 1.57 and a hydrogen ion concentration of 3.0 to 7.5. . According to this, the transparency of the protective layer coating film is good.

According to a fourth aspect of the present invention, there is provided the ink jet recording medium according to any one of the first to third aspects, wherein the fine particles of the protective layer have a hydrogen ion concentration of 2.0 to 2.0.
It is characterized by being inorganic fine particles within the range of 7.0.
According to this, the dispersibility of the inorganic fine particles in the copolymer is good. If the hydrogen ion concentration is 7.0 or more, the inorganic fine particles aggregate, and settle in the coating solution, which is not preferable.

According to a fifth aspect of the present invention, in the ink jet recording medium according to any one of the first to fourth aspects, the addition amount of the fine particles is 1 to 20% based on the copolymer resin. . According to this, the addition amount of the fine particles is 1%
When the amount is less than the above, the effect on the drying property and the blocking resistance of the medium is small, and when it exceeds 20%, the transparency is remarkably reduced.

According to a sixth aspect of the present invention, in the ink jet recording medium according to any one of the first to fifth aspects, the coating thickness of the protective layer is 0.5 to 2 μm. According to this, when the thickness of the protective layer is less than 0.5 μm, the effect on the drying property and anti-blocking property of the medium is small, and when it exceeds 2 μm, the transparency is significantly reduced.

According to a seventh aspect of the present invention, in the ink jet recording medium according to any one of the first to sixth aspects, a component other than diacetone (meth) acrylamide of the copolymer resin component is a hydrophobic monomer and a cation-modified component. It is a quaternary copolymer comprising a hydrophilic monomer other than the (meth) acrylic monomer and the cation-modified (meth) acrylic monomer. According to this, a hydrophobic monomer has an effect on water resistance of a coating film, and a cation-modified (meth) acrylic monomer and a hydrophilic monomer other than the cation-modified (meth) acrylic monomer have an effect on ink absorption and dye-dyeing properties, respectively.

The invention according to claim 8 is the ink jet recording medium according to any one of claims 1 to 7, wherein the hydrophilic monomer other than the cation-modified acrylic monomer of the copolymer resin component is (meth) acrylamide, and It is characterized by being vinylpyrrolidone. according to this,
(Meth) acrylamides and vinylpyrrolidone have a large effect on dye-dyeing properties, particularly on cyan dye-dyeing.

According to a ninth aspect of the present invention, at least one surface of the base material mainly comprises the copolymer resin containing diacetone (meth) acrylamide as an essential component in the copolymer resin component and a carboxylic acid dihydrazide. After applying a coating liquid comprising the composition as a component, heat treatment is performed, and the copolymer resin is cured with carboxylic acid dihydrazide to form an ink receiving layer, and further, the copolymer resin is further formed thereon. After applying a coating liquid composed of fine particles and a composition containing carboxylic acid dihydrazide as the main component, heat treatment is performed, and the copolymer resin is cured with carboxylic acid dihydrazide to form a protective layer. This is a method for manufacturing an ink jet recording medium.

[0015]

In order to solve the above problems, the ink jet recording medium of the present invention contains diacetone (meth) acrylamide as an essential component in a copolymer resin component on at least one surface of a substrate. And a device having an ink receiving layer which is cured by heating with carboxylic acid dihydrazide.

In the above-mentioned ink jet recording medium, the image quality and the drying property of the ink can be improved by sequentially laminating an ink receiving layer made of the thermosetting copolymer and a protective layer containing the microparticles. It has been found that an ink jet recording medium having excellent performance can be obtained, and the present invention has been completed.

The ink 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. For such an ink receiving layer, a copolymer resin comprising diacetone (meth) acrylamide as an essential component and a hydrophobic monomer, a cation-modified acrylic monomer, and a hydrophilic monomer other than the cation-modified acrylic monomer is used as a carboxylic acid dihydrazide. It is composed of a material that has been heat-cured. In the present invention, by using diacetone (meth) acrylamide as an essential component,
By obtaining a crosslinked structure maintaining hydrophilicity by a combination of a thermosetting reaction with a dihydrazide compound, excellent image quality and complete water resistance can be imparted. Further, on this ink receiving layer, by providing a protective layer composed of the copolymer and fine particles, more excellent ink absorbency than that of a single-layer structure,
It has been found that image quality can be provided.

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 are highly hydrophobic and have high Tg of a homopolymer, so that it is possible to synthesize a copolymer having good film 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) acryloyloxytrimethylammonium bromide, and (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) acrylamidopropyltridimethylhydroxypropylammonium acetate, allyltrimethylammonium chloride, methacryloline chloride, methacryloline bromide, methacryloline yoda And a mixture thereof.

Examples of hydrophilic monomers other than the cation-modified acrylic monomer described in the present invention include acrylamide monomers represented by acrylamide, methacrylamide, dimethylacrylamide and the like, and vinylpyrrolidone and the like, and mixtures thereof. May be.

The amount of diacetone (meth) acrylamide described in the present invention is desirably copolymerized at a ratio of 5 to 40% by weight based on all monomer components. The reason for this is that the diacetone (meth) acrylamide component acts on both image quality and curing by crosslinking, so that if the added amount is 5% by weight or less, the effects on image quality and water resistance are small, and 40%.
When the content is more than 10% by weight, the hydrophilicity of the copolymer resin is excessively increased, and it is difficult to achieve both water resistance and image quality even by crosslinking. More preferably, the content is in the range of 10 to 20% by weight. If necessary, an acrylamide-based monomer other than diacetone (meth) acrylamide may be copolymerized for imparting hydrophilicity.

The addition amount of the cation-modified acrylic monomer described in the present invention is preferably one copolymerized at a ratio of 10 to 50% by weight based on all monomer components. The reason for this is that the cation-modified acrylic monomer contributes to water absorption and ink fixability, so that its effect is small when it is 10% by weight or less, and when it is 50% by weight or more, the hydrophilicity is excessively increased, thereby giving water resistance. This is not desirable because it makes it difficult to maintain the physical properties of the coating film.
More preferably, the content is in the range of 10 to 30% by weight.

The carboxylic dihydrazide described in the present invention includes malonic dihydrazide, succinic dihydrazide, glutaric dihydrazide, adipic dihydrazide, pimelic dihydrazide, suberic acid dihydrazide, azelaic dihydrazide, sebacic dihydrazide, dodecane diacid dihydrazide, and dodecane dihydrazide dihydrazide 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 carboxylic acid dihydrazide described in the present invention is preferably 0.02 to 0.50 times the molar equivalent of the diacetone (meth) acrylamide. The reason for this is that the carboxylic acid dihydrazide undergoes a cross-linking reaction with the active carbonyl group of the diacetone (meth) acrylamide component, so that the amount added is 0.02 times or less the molar amount of diacetone (meth) acrylamide. And the water resistance effect by crosslinking is small, 0.5
If the amount is more than 0 times the amount of unreacted components, the image quality and water resistance decrease.

The filler described in the present invention includes, for example, polymethyl methacrylate, polystyrene, vinyl resin such as fluororesin, polyolefin resin such as polyethylene and polypropylene, thermoplastic resin such as polyamide, polybenzoguanamine resin, or Synthetic resin fine particles made of thermosetting resin such as urea resin, or natural polymers such as cellulose and starch fine particles, silica, clay, calcium carbonate, barium sulfate, alumina white, aluminum hydroxide, talc, bentonite, titanium oxide Etc., silicic anhydride, colloidal silica, etc., hydrous silicic acid,
Examples include white carbon such as hydrous calcium silicate and hydrous aluminum silicate, and inorganic fine particles such as alumina sol.

Preferably, about 0.1 to 20 wt% is usually contained in the ink 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 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 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 receiving layer is formed by applying a coating liquid obtained by mixing the above-mentioned main agent and curing agent at an appropriate equivalent ratio on at least one surface of the support by a known coating means such as gravure coating, roll coating, wire bar coating, or the like. I just need to work.

By heating the ink 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. Further, the surface of the base material may be subjected to a corona discharge treatment or a known easy adhesion treatment such as an anchor layer made of polyurethane resin or the like for the purpose of improving the adhesiveness of the ink 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, diacetone (meth) acrylamide is an essential component in a copolymer resin component. As an ink receiving layer formed by heating and curing with a carboxylic acid dihydrazide, and a protective layer made of a thermosetting product of the copolymer resin and microparticles, which are sequentially laminated to provide excellent image quality and wettability. Water resistance is also achieved at the same time as dyeability.

The cation-modified portion of the copolymer, mainly (meth) acrylamides and vinylpyrrolidone have ink absorption and dyeing properties, and complete resin is obtained by a crosslinking reaction between diacetone (meth) acrylamide and carboxylic acid dihydrazide. To achieve water resistance. In addition, the ink absorption rate is given by the fine particles filled in the protective layer, so that even if the ink is absorbed, stickiness does not occur and the effect of preventing blocking is also exhibited.

[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, 20 g of methyl methacrylate, 10 g of diacetone (meth) acrylamide, and 15 g of methacryloyloxyethyltrimethylammonium chloride. , 55 g of 1-vinyl-2-pyrrolidone was introduced, isopropyl alcohol: water = 1: 1 was added and dissolved, and the mixture was stirred on an oil bath under a nitrogen atmosphere. Polymerization was started by adding 0.4 g of α, α'-azobisisobutyronitrile thereto, and the mixture was heated and stirred in a 60 ° C. oil bath for 4 hours to give a colorless and viscous polymer solution A. I got

<Synthesis Example 2> In a four-necked flask equipped with a stirrer, a nitrogen inlet tube and a reflux condenser, 20 g of methyl methacrylate, 10 g of diacetone (meth) acrylamide, and methacryloyloxyethyltrimethylammonium paratoluene 15 g of sulfonate, 1-vinyl-
55 g of 2-pyrrolidone was introduced, isopropyl alcohol: water = 1: 1 was added and dissolved, and the mixture was stirred on an oil bath under a nitrogen atmosphere. Polymerization was started by adding 0.4 g of α, α'-azobisisobutyronitrile thereto, and the mixture was heated and stirred in a 60 ° C. oil bath for 4 hours to give a colorless and viscous polymer solution B. I got

Synthesis Example 3 In a four-necked flask equipped with a stirrer, a nitrogen inlet tube and a reflux condenser, 30 g of methyl methacrylate, 10 g of diacetone (meth) acrylamide, and 15 g of methacryloyloxyethyltrimethylammonium chloride. And 45 g of dimethylaminoacrylamide, and isopropyl alcohol: water = 1: 1
Was added and dissolved, and the mixture was stirred on an oil bath under a nitrogen atmosphere. Polymerization was started by adding 0.4 g of α, α'-azobisisobutyronitrile thereto, and the mixture was heated and stirred in a 60 ° C. oil bath for 5 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, 30 g of methyl methacrylate, 10 g of diacetone (meth) acrylamide, and methacryloyloxyethyltrimethylammonium paratoluene 15 g of sulfonate and 45 g of dimethylaminoacrylamide were introduced, isopropyl alcohol: water = 1: 1 was added and dissolved, and the mixture was stirred on an oil bath under a nitrogen atmosphere. Polymerization was started by adding 0.4 g of α, α'-azobisisobutyronitrile thereto, and the mixture was heated and stirred in an oil bath at 60 ° C. for 5 hours to give a colorless and viscous polymer solution D. I got

<Synthesis Example 5> In a four-necked flask equipped with a stirrer, a nitrogen inlet tube and a reflux condenser, 20 g of styrene monomer and 1 g of diacetone (meth) acrylamide were placed.
0 g, methacryloyloxyethyltrimethylammonium chloride 15 g, dimethylaminoacrylamide 5
5 g was introduced, isopropyl alcohol: water = 1: 1 was added to dissolve, and the mixture was stirred on an oil bath under a nitrogen atmosphere. Polymerization was started by adding 0.4 g of α, α'-azobisisobutyronitrile thereto, and the mixture was heated and stirred for 8 hours in a 60 ° C. oil bath to give a colorless and viscous polymer solution E. I got

<Examples 1 to 10> From the obtained polymer solutions, an ink receiving layer coating composition having a solid content of about 20% was prepared using an appropriate amount of water and isopropyl alcohol with the ink receiving layer composition shown in Table 1. Similarly, a protective layer coating composition having a solid content of about 5% was prepared using an appropriate amount of water and isopropyl alcohol with the protective layer composition shown in Table 1. As a support, 10
The ink receiving layer coating composition is first dried by wire bar coating on a polyethylene terephthalate film (trade name: Lumirror E63S, manufactured by Toray Industries, Inc.) having a surface having a thickness of 0 μm and having an easy adhesion treatment, and the film thickness becomes 15 μm after drying. 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 Examples 1 to 5> An ink receiving layer coating composition having a solid content of about 20% was prepared from the obtained polymer solution with an appropriate amount of water and ethanol using the ink receiving layer composition shown in Table 1. A polyethylene terephthalate film (trade name;
Lumirror E63S, manufactured by Toray Industries, Inc.) was applied by wire bar coating so that the ink receiving layer coating composition had a thickness of 15 μm after drying, and was then dried in a dryer at 100 ° C. for 3 minutes. A recording medium was obtained.

[0044]

[Table 1]

<Medium Evaluation> A Canon inkjet printer (product name;
BJC-430J), 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 Drying Property] When paper was superimposed on the recording portion, the time until the ink was no longer transferred was evaluated. A: Dried within 5 minutes after printing. ；: Dried within 1 hour after printing. Δ: Dried one day after printing. X: It does not dry even if it takes one day or more after printing. [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. ；: Ink slightly leaked, but no significant change in color tone. Δ: Ink leaked out, and change in color tone was observed. ×: 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.

[0046]

[Table 2]

[0047]

As described above, according to the constitution of the present invention, all of the ink jet recording media were excellent in ink wettability and dyeability, excellent in ink absorption, and excellent in water resistance. In addition, by providing a protective layer containing fine particles, it was possible to improve the ink drying property and 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 is 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 body 3 ... Ink receiving layer 4 ... Protective layer

 ──────────────────────────────────────────────────続 き Continued on front page F-term (reference) 2H086 BA12 BA15 BA32 BA45 4F100 AA00B AA00H AH00B AH00H AK01B AK25J AK26B AK42A AK80B AL01B AT00A BA02 BA10A BA10B BA15 DE01B DE01H EH461 EJ462B EJ08B EJ08B EJ08B EJ08B 4J038 CG171 CK031 GA02 KA20 MA14 NA04 PA19

Claims (9)

[Claims] 1. An ink receiving layer comprising diacetone (meth) acrylamide as an essential component in a copolymer resin component and heat-cured with a carboxylic acid dihydrazide on at least one surface of a base material; An ink jet recording medium comprising a thermosetting polymer resin and a protective layer made of fine particles laminated in this order. 2. The fine particles contained in the protective layer are spherical, have an average particle diameter of 0.01 to 30 μm, and are insoluble in water or alcohols. Inkjet recording medium. 3. The fine particles of the protective layer have a refractive index of 1.4.
5 to 1.57 and the hydrogen ion concentration is 3.0 to
3. The ink jet recording medium according to claim 1, wherein the fine particles are organic fine particles within a range of 7.5. 4. The ink jet recording medium according to claim 1, wherein the fine particles of the protective layer are inorganic fine particles having a hydrogen ion concentration in a range of 2.0 to 7.0. . 5. The ink jet recording medium according to claim 1, wherein the amount of the fine particles in the protective layer is 1 to 20% with respect to the copolymer resin. 6. The coating thickness of the protective layer is 0.5 to 2 μm.
The ink jet recording medium according to any one of claims 1 to 5, wherein 7. The copolymer resin component other than diacetone (meth) acrylamide comprises a hydrophobic monomer, a cation-modified (meth) acrylic monomer, and a hydrophilic monomer other than the cation-modified (meth) acrylic monomer. 2. A quaternary copolymer.
7. The ink jet recording medium according to any one of items 6 to 6. 8. The ink-jet printer according to claim 1, wherein the hydrophilic monomer other than the cation-modified acrylic monomer of the copolymer resin component is (meth) acrylamides and vinylpyrrolidone. recoding media. 9. A composition comprising, as a main component, a copolymer resin containing diacetone (meth) acrylamide as an essential component in a copolymer resin component and carboxylic acid dihydrazide on at least one surface of a substrate. After applying a coating liquid, a heat treatment is performed, the copolymer resin is cured with carboxylic acid dihydrazide to form an ink receiving layer, and the copolymer resin and carboxylic acid dihydrazide are further formed thereon. An ink jet recording medium comprising applying a coating liquid comprising a composition as a main component and fine particles, applying a heat treatment, curing the copolymer resin with carboxylic acid dihydrazide, and laminating a protective layer. Manufacturing method.