JP3378810B2 - Inkjet recording media - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium, and in particular, it has excellent ink absorbency, good surface strength, and no decrease in density or change in color tone due to direct sunlight (sunlight) or room light. The present invention relates to an ink jet recording medium that has a high ink absorption speed and is sufficiently compatible with future high speed printing.

[0002]

2. Description of the Related Art Inkjet printers have become more and more popular in recent years because they have features such as clear recording, quiet sound, and easy colorization. In this inkjet printer, it is necessary to use an ink that is difficult to dry in order to prevent clogging of the nozzle due to drying of the ink. As an ink having this characteristic, a water-soluble ink in which a dye, a solvent, an additive and the like are dissolved or dispersed in water is generally used. However, the characters and images formed on the recording medium using water-soluble ink are more water and moisture resistant than those printed with pigment-based inks and silver salt photographs・ It is inferior from the standpoint of light resistance, that is, it does not fade and that it can be stored indoors or in direct sunlight.

In recent years, as ink jet printers have become cheaper and their vividness and colorability have become more familiar, demands for various characteristics such as light resistance of recorded images and surface strength of ink jet recording media have become increasingly high and severe. It is becoming. Therefore, under the present circumstances, it is now an essential condition for the ink jet recording medium to completely secure various properties such as light resistance and surface strength.

[0004]

However, the conventional ink jet recording medium has been proposed to improve the light resistance of recording characters, images, etc., particularly full-color recording, but it is still insufficient. Further, the recording medium is formed with an ink receiving layer containing a large amount of a pigment component having excellent ink absorbability, and the strength of the ink receiving layer is reduced due to the increase in the amount of ink used for full-color recording,
There is a problem with the surface strength that the pigment may fall off or the ink receiving layer may peel off due to rubbing or bending the surface. Therefore, the present invention has been made in view of the above-mentioned circumstances in the prior art, and has good ink jet recording characteristics, excellent light resistance that has not been obtained in the past, and excellent surface strength in which a recorded image is hardly peeled off. The purpose is to provide a medium for use.

[0005]

The present inventor has conducted various studies on ink jet recording media, and as a result, alkyl acrylate, hydroxyalkyl (meth)
By providing an ink receiving layer containing a copolymer containing an acrylate, an antioxidant monomer and / or an ultraviolet absorbing monomer as a monomer component, it is extremely effective in improving the light resistance and surface strength of the inkjet recording medium. I found that. In addition, the present inventors
Add acrylonitrile as a copolymerization component of the polymer
Inkjet recording characteristics and light resistance
It was found that the wear resistance can be improved. Therefore, the inkjet recording medium of the present invention is made based on the above findings, and is an inkjet recording medium having an ink receiving layer provided on at least one surface of a substrate,
The binder resin of the ink receiving layer contains at least component A: alkyl acrylate, component B: hydroxyalkyl (meth) acrylate, component C: antioxidant monomer and / or UV absorbing monomer , and
It is characterized in that it contains a copolymer containing four components of acrylonitrile as a monomer component as a main component. Less than,
A preferred embodiment of the present invention will be described in detail.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The ink jet recording medium of the present invention has a layer structure in which at least one layer of an ink receiving layer is provided on at least one side of a substrate by a laminating means such as a coating method. It may be present or a surface layer may be provided on the ink receiving layer. The materials constituting the substrate, the ink receiving layer and the surface layer will be described below.

(1) Substrate The substrate on which the ink receiving layer used in the present invention is applied is a chemical pulp such as LBKP or NBKP, GP or PG.
W, RNP, TMP, CTMP, CMP, CMP and other mechanical pulps, DIP and other waste paper pulps and other wood pulps, and polyethylene fibers and other synthetic fiber pulps as main components, pigments and sizing agents, fixing agents, and yield improvers. , Various additives commonly used in papermaking such as paper-strengthening agents are mixed if necessary, and base paper produced by various devices such as Fourdrinier paper machine, cylinder paper machine, twin wire paper machine, It is possible to use a base paper in which a size press using starch, polyvinyl alcohol or the like or an anchor coat layer is provided on the base paper, or coated paper such as art paper, coated paper or cast coated paper having a coat layer provided thereon. The ink receiving layer may be provided on the base paper and the coated paper as they are, and the one that has been smoothed before the coating of the ink receiving layer using a calendar device such as a machine calendar, a TG calendar, and a soft calendar is used. You may.

Further, as the substrate, a polyolefin resin layer may be provided on the above-mentioned base paper, synthetic resin such as polyethylene, polypropylene, polyester, nylon, rayon, polyurethane, etc., a film material of a mixture thereof,
It is also possible to use a medium material formed by molding these synthetic resins into fibers.

(2) Ink-Receiving Layer In the present invention, the use of a copolymer composed of the following specific monomer components as the main component of the binder resin of the ink-receiving layer provided on at least one side of the substrate is excellent. Ink jet recording characteristics can be achieved. The ink receiving layer is formed by adding other binder resins and additives to the copolymer and the pigment as needed.

(A) Monomer Component of Copolymer The acrylic acid alkyl ester of the component A is
It is a component that exerts an effect on miscibility with a pigment, stability of a coating, and the like, and a compound represented by the following chemical formula 1 can be used. The content of the alkyl acrylate ester in the copolymer is preferably 50 mol% or more, and when it is less than 50 mol%, the film strength becomes insufficient and there is a problem in abrasion resistance. In the formula, R ₁ represents an alkyl group having 1 to 6 carbon atoms. However, in the present invention, excellent moisture resistance that does not cause discoloration or fading of the image even when the recorded image is left under high temperature and high humidity is obtained. Therefore, ethyl acrylate is preferable.

[0011]

[Chemical 1]

Hydroxyalkyl (meth) as the component B
As the acrylate, a compound represented by the following chemical formula 2 can be used. Hydroxyalkyl (meth) acrylate has the effects of enhancing the dispersibility of the copolymer and further improving the sharpness and light resistance of the image. The content of the component B in the copolymer is preferably 1 to 25 mol%. If the content of this component B exceeds 25 mol%, the problem of poor water resistance occurs. In the formula, R ₂ represents a hydrogen atom or a methyl group, R ₃ represents a C 1-6 alkyl group having a hydroxyl group as a substituent, and the hydroxyl group is preferably at the terminal. In the present invention, among such compounds, 2-hydroxyethyl methacrylate, which is particularly excellent in the above effects, is preferable.

[0013]

[Chemical 2]

The antioxidant monomer and the ultraviolet absorbing monomer of the C component are compounds having a structure capable of polymerizing with the A component and the B component and having excellent water solubility and dispersibility, for example, the following chemical formula (3) Monomer) and
Examples thereof include compounds represented by (ultraviolet absorbing monomer). These compounds may be used alone or in combination of two or more, but it is necessary that at least one kind is contained in the copolymer. By thus incorporating the antioxidant monomer and / or the ultraviolet absorbing monomer into the copolymer, it is possible to obtain light resistance superior to that obtained by simply adding the antioxidant and / or the ultraviolet absorbing agent to the binder resin. it can. Further, the content of the component C in the copolymer is preferably 1 to 20 mol%, and when it is more than this range, the image characteristics, particularly the ink adsorbability are deteriorated. In the formula, R ₄ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R ₅ represents a hydrogen atom, a methyl group or an ethyl group. R ₆ is a hydrogen atom,
It represents a halogen atom, a hydroxyl group, an alkyl group, an acyl group, an acyloxy group or an alkoxyl group, and the alkyl group, the acyl group, the acyloxy group and the alkoxyl group preferably have 1 to 3 carbon atoms.

[0015]

[Chemical 3]

[0016]

[Chemical 4]

Further, in the present invention, the fourth common weight
Acrylonitrile represented by the following chemical formula 5 is used as a compounding component.
Need to be present. Use this acrylonitrile
Inkjet recording characteristics and light resistance
Wearability can be improved. Furthermore, the above A,
As a monomer component of the copolymer other than the components B and C and acrylonitrile , a compound that does not impair the miscibility with the binder resin and the dispersibility of the copolymer is improved in ink jet recording characteristics and light resistance / wear resistance. A compound can be added as appropriate .

[0018]

[Chemical 5]

(B) Preparation of Copolymer Since the alkyl acrylate as the component A is poorly soluble in water, the copolymer of the above materials is prepared by an emulsion polymerization method and used as an acrylic aqueous emulsion.
When the above monomer components are dispersed in water together with an emulsifier,
It becomes an emulsion in which the component A is incorporated into the micelle formed by the emulsifier. Usually, as the emulsifier, at least one of anionic, cationic and nonionic surfactants is used. In the preparation of the copolymer used in the present invention, partially saponified polyvinyl alcohol is used as a protective colloid agent. If used, it also functions as an emulsifier, so it is preferable to use partially saponified polyvinyl alcohol. Then, a polymerization initiator is added to this emulsion to generate radicals in the aqueous layer to initiate polymerization. The low polymer radical generated here is
It can enter the micelles and can form a high polymer by further polymerizing with the component A. In this method, since the polymerization is carried out in an emulsified state, the polymerization rate is high and it is easy to obtain a high polymer. Further, there is an advantage that the molecular weight distribution of the polymer is narrow and the characteristics of the copolymer can be easily controlled.

The heating temperature during polymerization is preferably 60 to 100 ° C, more preferably 80 to 90 ° C. If the heating temperature is too low, the weight average molecular weight becomes very large, which adversely affects the ink absorbability and the like. If it is too high, normal polymerization reaction does not occur and by-products occur. Further, in the case of a polymer having a small weight average molecular weight, the film strength of the ink receiving layer using the polymer will be insufficient.

As the polymerization initiator, a known radical polymerization initiator can be used. Specifically, 2,
2'-azobis-isobutyronitrile, 2,2'-azobis-2-methylbutyronitrile, 1,1'-azobis-1-cyclohexanecarbonitrile, dimethyl-2,
2'-azobisisobutyrate, 2,2'-azobis-
Azo-based initiators such as (2-amidinopropane) -2-hydrochloride, benzoyl peroxide, decanoyl peroxide, acetyl peroxide, t-butyl peroxide, octanoyl peroxide, succinic acid peroxide, etc. Examples include physical initiators. The half-life temperature of these polymerization initiators is preferably 60 to 90 ° C, more preferably 65 to 80 ° C.

(C) Binder resin In the present invention, the binder resin contained in the ink receiving layer contains the above-mentioned copolymer as a main component, and the copolymer is 30 to 100% by weight of the whole binder resin. Is preferable, and 40 to 80% by weight is more preferable. As the binder resin which can be used in combination with such a copolymer, a water-soluble or water-dispersible resin can be used, and examples thereof include polyvinyl alcohol, vinyl acetate, oxidized starch, etherified starch, casein, gelatin,
Soybean protein, modified polyvinyl alcohol such as carboxyl modified, carboxymethyl cellulose; cellulose derivative such as hydroxyethyl cellulose, maleic anhydride resin; styrene-butadiene copolymer; conjugated diene-based copolymer latex such as methyl methacrylate-butadiene copolymer, Acrylic polymer latex such as polymers or copolymers of acrylic acid ester and methacrylic acid ester, vinyl polymer latex such as ethylene vinyl acetate copolymer, or functional group such as carboxyl group of these various polymers Functional group-modified polymer latex with monomer, melamine resin; water-based adhesive such as thermosetting synthetic resin such as urea resin, polymethylmethacrylate; polyurethane resin; unsaturated polyester resin; vinyl chloride-vinyl acetate copolymer; Vinyl butyral; synthetic resin adhesives such as alkyd resins and the like, which can be used alone or in combination.

(D) Pigment In the present invention, the ink receiving layer may contain one or more generally used pigments which are insoluble or sparingly soluble in water. For example, light calcium carbonate, heavy calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic amorphous Silica, colloidal silica, colloidal alumina, pseudo-boehmite,
White inorganic pigments such as aluminum hydroxide, alumina, lithopone, zeolite, hydrohalosite, magnesium carbonate, magnesium hydroxide, styrene plastic pigments, acrylic plastic pigments, organic pigments such as polyethylene, urea resins and melamine resins. To be

Among the above, the white pigment contained as the main component in the ink receiving layer is preferably a porous inorganic pigment because it is excellent in the drying property and absorbing property of the ink jet ink, and the porous synthetic amorphous silica is preferable. , Porous magnesium carbonate, porous alumina and the like. Among them, in the present invention, sedimentation with a specific surface area of about 200 to 600 g / m ² which satisfies both print quality and storage properties (water resistance, abrasion resistance, light resistance, indoor storage property, storage property against direct sunlight). It is preferred to use type and gel type porous amorphous silica. Further, the mixing ratio of the pigment and the binder resin in the ink receiving layer is preferably binder resin: pigment = 30: 70 to 95: 5, and more preferably 30:70 to 50:50 by weight.

(E) Additive In order to improve the light fastness and various characteristics of the image, a water-soluble metal salt compound having a valence of 2 or more can be added to the ink receiving layer. Specifically, magnesium chloride, calcium chloride, barium chloride, tin chloride, lead chloride, magnesium sulfate, magnesium chlorate, magnesium phosphate, magnesium nitrate, barium nitrate, calcium nitrate and the like. The content of these metal salts is preferably 1.0 to 40.0% by weight, and more preferably 5.0 to 20.0% by weight, based on the total solid content of the ink receiving layer.

Other additives include pigment dispersants, thickeners, fluidity improvers, defoamers, foam suppressors, mold release agents,
A foaming agent, a penetrating agent, a coloring dye, a coloring pigment, a fluorescent brightening agent, an antioxidant, an ultraviolet absorber, a preservative, a water-proofing agent, a curing agent and the like can be appropriately added as necessary.

(F) Formation of Ink Receptive Layer In order to form an ink receiving layer, a coating solution is prepared by dissolving or dispersing the above-mentioned materials forming the layer in water or an appropriate solvent such as alcohol in which the materials are dissolved. This is coated and formed on a base material by using various devices such as various blade coaters, roll coaters, air knife coaters, bar coaters, rod blade coaters, size presses, etc. on machine or off machine as appropriate. The ink receiving layer may be provided as a single layer or divided into two layers. When two layers are provided, the copolymer may be contained in both layers, but may be contained only in the second layer (surface side).

The coating amount of the ink receiving layer is, for example, preferably 5 to 30 g / m ² in the one-layer type. When the first ink receiving layer is laminated on the substrate and the second ink receiving layer is laminated on the first ink receiving layer to form a two-layer type, the coating amount of the first ink receiving layer is 5 preferably to 30 g / ^{m 2,} in particular, 5 to 20 g / ^{m 2} is preferred. The coating amount of the second ink receiving layer is preferably from 5 to 15 g / ^{m 2,} in particular 5 to 10 g / ^{m 2} is preferred. If the coating amount is less than this range, sufficient ink absorbency and fixability may not be obtained, and if it is greater than this range, problems such as powder falling may occur, and productivity may be reduced and cost may be increased. In particular, if the coating amount of the second ink receiving layer is more than 15 g / m ^2, it may be difficult for the ink to pass through the second ink receiving layer, causing bleeding and impairing the sharpness of the image. . Thus, it is preferable to control the coating amount of the ink receiving layer by the number of the ink receiving layers laminated. Further, after the ink receiving layer is coated, it may be finished using a calendar such as a machine calendar, a TG calendar, a super calendar, and a soft calendar.

(3) Surface Layer In the present invention, a surface layer containing a binder resin and a pigment can be provided on the above-mentioned ink receiving layer. As the binder resin forming the surface layer, a water-soluble resin that can be used in combination with the above-mentioned ink receiving layer can be appropriately used. Further, in order to improve recording characteristics such as ink absorbability, it is preferable to use the pigment used in the ink receiving layer described above in the surface layer together with the binder resin, and among them, colloidal silica is excellent in dispersibility, and the stability of the coating is improved. Since it has the effect of improving the productivity and improving the productivity,
It is particularly suitable.

In addition to the above binder resin and pigment, additives for improving the light resistance and various characteristics of the image used in the ink receiving layer may be appropriately added to the material forming the surface layer, if necessary. You can The blending ratio of the binder resin and the pigment in the surface layer is preferably binder resin: pigment = 5: 95 to 30:70 by weight, and more preferably 5:95 to 20:80.

The surface layer is prepared by dispersing and dissolving the above materials in a suitable solvent such as water or an organic solvent to prepare a coating solution, which is applied and dried on the ink receiving layer by the same operation as the ink receiving layer. Can be formed. The coating amount of the surface layer is preferably 5 to 15 g / ^{m 2,} in particular 5 to 10 g /
m ² is preferred. When the coating amount is more than 15 g / m ^2, it becomes difficult for the ink to pass through the surface layer, causing bleeding and impairing the sharpness of the image. Further, the surface layer may be a gloss layer, and may be finished by using a calendar such as a machine calendar, a TG calendar, a super calendar or a soft calendar after coating.

[0032]

EXAMPLES Next, examples of the present invention and comparative examples will be shown to further clarify the effects of the present invention. In each of the Examples and Comparative Examples, the base material was a high-quality paper having a basis weight of 90 g / m ² , and the coating amount was 10 g / both for the ink receiving layer and the surface layer.
It was m ^2. <Example 1>

Preparation of Copolymer Material 17 except the component B from the material of the copolymer having the following composition
1 g, potassium persulfate 0.72 g, partially saponified PVA (trade name: Kuraray Poval PVA-217E, manufactured by Kuraray Co., Ltd.) as an emulsifier / protective colloid agent, and water 172.
It was dispersed in 8 g and stirred at 3000 rpm for 2 minutes to prepare an emulsion. From this emulsion, 10 g was set aside, and 0.18 g of potassium persulfate and sodium hydrogen carbonate.
36 g and 79.2 g of water were mixed, and the mixture was mixed in a nitrogen atmosphere at 8
Heat to 0 ± 2 ° C. Then, a solution prepared by mixing 9.0 g of the following component B with the above-mentioned remaining emulsion was added dropwise thereto over 2 hours, and further 0.18 g of potassium persulfate was added to 18 parts of water.
After mixing the aqueous solution dissolved in g, the mixture was heated at 85 ± 2 ° C. for 2 hours. This reaction liquid was cooled, the pH was adjusted to 7 to 8 with aqueous ammonia, and the mixture was filtered through a 150-mesh wire net to polymerize the following monomer components in the following proportions, and an acrylic water-based emulsion type with a weight average molecular weight of about 300,000. Was prepared. The blending ratio of the copolymer is shown in mol%. [Blend of Copolymer] -A component ethyl acrylate 54.5 mol% -B component 2-hydroxyethyl methacrylate 13.4 mol% -C component UV absorbing monomer of the following chemical formula 1.0 mol%

[0034]

[Chemical 6]

[0035]   Antioxidant monomer of the following chemical formula 8.0 mol%

[0036]

[Chemical 7]

[0037] ・ Other ingredients   Acrylonitrile 22.1 mol%

Formation of Ink Receptive Layer Next, an ink receptive layer was laminated by applying a coating liquid for the ink receptive layer having the following composition on one side of the substrate and drying. [Coating for ink receiving layer] -Binder resin 30 parts by weight of the acrylic water-based emulsion type copolymer (solid content concentration 41% by weight) 9 parts by weight of itaconic acid-modified PVA (trade name: KL-318K, manufactured by Kuraray Co., Ltd.) -Silica 39 parts by weight (Product name: Mizukasil P78D, manufactured by Mizusawa Chemical Co., Ltd.)-Cationic dye fixing agent 3.5 parts by weight (Product name: Polyfix 550, Showa High Polymer Co., Ltd.)-Magnesium chloride 2.5 parts by weight (Product name: magnesium chloride S, manufactured by Tomita Pharmaceutical Co., Ltd.) ・ Water 156 parts by weight

Formation of surface layer Next, a coating solution having the following composition is applied onto the ink receiving layer.
By drying, the surface layers were laminated to provide the inkjet recording medium of the present invention. [Composition of paint for surface layer] 10 parts by weight of partially saponified PVA (trade name: Gohsenol T-330, manufactured by Nippon Synthetic Chemical Industry) 90 parts by weight of colloidal silica (trade name: Snow Tech UP, manufactured by Nissan Chemical Co., Ltd., Solid content concentration 39% by weight)

<Examples 2 to 3 , Comparative Examples 1 to 5> In the same manner as in Example 1 except that the material of the copolymer was changed to the composition shown in Table 1, Examples 2 to 3 of the present invention and The inkjet recording media of Comparative Examples 1 to 5 were obtained.

[0041]

[Table 1]

Next, a commercially available ink jet printer (PM700C, manufactured by Seiko Epson Corp.) is used by using the ink jet recording media of Examples 1 to 3 and Comparative Examples 1 to 5.
A printed image was obtained by printing an evaluation object such as a color patch on the surface layer using. Using the image thus obtained, light resistance in the following manner,
The surface strength and ink absorbency were evaluated.

[Evaluation method] Light resistance 1 (xenon lamp acceleration test) Xenon weather ometer (ATLAS, Ci-50)
No. 00) was used for the ink jet recording medium of each Example and each Comparative Example, a black panel temperature of 65 ° C.,
Relative humidity 50%, 340nm UV irradiation intensity 0.35W
An exposure test of 90 kJ / m ² was conducted at / m ² . Then
Spectrophotometer (Gretag S manufactured by Gretag Macbeth Co.)
PM50) was used to measure the reflection density of magenta of these recording media before and after the exposure test to obtain the residual ratio (%) of the reflection density after the exposure test to evaluate the light resistance.

Light resistance 2 (fluorescent lamp acceleration test) Approximately 6 W / m ² (UV wavelength range of 300 nm to 400 nm) for 150 hours using a fluorescent lamp acceleration tester (HPLA, manufactured by ATLAS), white fluorescent lamp only The exposure test was performed on the ink jet recording medium of each Example and each Comparative Example by irradiation with. Then, using a spectrophotometer (GRETAG SPM50 manufactured by Gretag Macbeth Co., Ltd.),
The light resistance was evaluated by measuring the magenta reflection density of these recording media in the same manner as in the light resistance 1 xenon lamp acceleration test.

Light Resistance 3 (Sunlight / Actual Environment Test) Yellow, magenta, cyan, and black color patches were printed on the ink jet recording medium of each Example and each Comparative Example, and these colors were passed through the glass window facing south. The patch was left for about 1 month, the residual ratio of the reflection density for each color was obtained in the same manner as the light resistance 1, and the light resistance was evaluated by the average value thereof.

Surface Strength (Adhesiveness) Cellotape was attached to the surface of the surface layer on which an image was formed, and the tape was peeled off to evaluate the surface strength as follows. Evaluation of surface strength A: Excellent in practical use without any problem (no deposits are found on cellophane tape) B: Excellent without practical problem (some deposits are seen, but at least a part of the recorded image) (Peeling off does not occur) C: Practically inferior. (At least part of the recorded image will peel off)

Ink absorbency The ink absorbency of genuine glossy paper manufactured by Seiko Epson (trade name: glossy paper for exclusive use of Super Fine (thick mouth) photo print paper) is compared with the naked eye, and mixed color bleeding with an inkjet printer is performed. Also, the ink absorbency was evaluated by observing bleeding in a single color. Evaluation of Ink Absorbability A: Excellent in practical use without any problems (equal to or higher) B: Excellent in practical use (slightly inferior, but the difference in SCID image is unknown) C: Inferior in practical use The above evaluation results are shown in Table 2.

[0048]

[Table 2]

As is clear from the results shown in Table 2, the ink jet recording medium of the present invention provided good characteristics . On the other hand, Comparative Example 3 containing no B component
In Nos. 4 to 4, the surface strength and ink absorbency are poor, and in Comparative Examples 1 to 3 containing no C component, the light resistance is poor.
It was not practically usable as an inkjet recording medium.

[0050]

As described above, according to the present invention, at least the component A: alkyl acrylate, the component B: hydroxyalkyl (meth) acrylate, the component C is used as the binder resin of the ink receiving layer of the ink jet recording medium. : By containing an antioxidant monomer and / or an ultraviolet absorbing monomer and a copolymer containing four components of acrylonitrile as a monomer component as a main component, a clear image without bleeding can be obtained due to good ink absorbability. An ink jet recording medium having excellent ink jet recording characteristics and exhibiting excellent light resistance and surface strength can be obtained. In addition, in the present invention, the use of the above-mentioned specific copolymer also improves the moisture resistance that does not cause discoloration or fading of the image even if the recording characteristics are left under high temperature and high humidity for a long time.

Front page continuation (72) Nobuhiro Kubota, Inventor No. 3 Munezawa, Shizuoka, Shizuoka Prefecture Stock Company, Tomagawa Paper Mills, Paper Division (72) Inventor Shinichiro Kobayashi, No. 3 Munemachi, Shizuoka, Shizuoka Prefecture No. 3 Incorporated company Tomoegawa Paper Co., Ltd. in the paper division (72) Inventor Kiyoshi Iwamoto No. 3 Somyo-cho for Shizuoka City, Shizuoka Prefecture 3-chome 3-5 Seiko Epson Co., Ltd. (72) Inventor Atsushi Sugiyama Yamato 3-chome 3-5 Seiko Epson Co., Ltd. (72) Inventor Hiroyuki Onishi 3-chome Yamato, Suwa-shi, Nagano No. 3-5 Seiko Epson Corporation (56) Reference JP 10-29369 (JP, A) JP 61-242871 (JP, A) JP 10-235992 (JP, A) JP Flat 8-174990 (JP, A) JP 8-183242 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B41M 5/00

Claims (5)

(57) [Claims] 1. An ink jet recording medium having an ink receiving layer provided on at least one surface of a substrate, wherein the binder resin of the ink receiving layer is at least component A: alkyl acrylate, component B: hydroxyalkyl (meth). ) Acrylate, C component: antioxidant monomer and / or UV absorbing monomer , and acryloni
An ink jet recording medium, characterized in that it contains a copolymer containing four components of tolyl as a monomer component as a main component. 2. The ink jet recording medium according to claim 1, wherein the content of the component C in the copolymer is 1 to 20 mol%. 3. The ink jet recording medium according to claim 1, wherein the content of the component B in the copolymer is 1 to 25 mol%. 4. The ink receiving layer contains a pigment, and the mixing ratio of the binder resin and the pigment is 3 by weight.
It is 0: 70-95: 5, It is characterized by the above-mentioned.
4. The inkjet recording medium according to any one of 3 above. 5. The inkjet recording medium according to claim 1, wherein a proportion of the copolymer in the binder resin of the ink receiving layer is 30 to 100% by weight.