JP3461754B2 - Ink jet recording medium and recording method - 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 high printing density, is clear, has excellent ink absorbability, and has good surface strength, light resistance, indoor storability, and water resistance. The present invention relates to an ink jet recording medium that has no density drop / color tone change with respect to direct sunlight (sunlight) or room light, has a high ink absorption rate, and is sufficiently compatible with future high-speed printing.

[0002]

2. Description of the Related Art Ink jet printers have characteristics such as sharpness of recording, quietness of 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,
Water-soluble inks in which dyes, solvents, additives, etc. are dissolved or dispersed in water are used. However, characters and images formed on recording media using water-soluble inks are more light-resistant, water-resistant, and moisture-resistant than those printed with pigment-based inks and silver-salt photographs (leave at high temperature and high humidity). However, it is inferior from the viewpoints of no discoloration or fading), indoor storability and storability against 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 indispensable condition for the inkjet 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 of characters and images, 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, If the pigment comes off or the ink receiving layer is peeled off by rubbing or bending the surface, there is a problem with respect to the surface strength. In particular, when the surface strength is weak, there is a problem in that, during ink jet recording, a phenomenon in which a recorded image is lost (referred to as a knurled warp) is observed by the transport roller. Therefore, the present invention has been made in view of the above-described actual situation 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 inventors Means for Solving the Problems] As a result of repeated various studies on the ink jet recording medium, the specific
Partially saponified polyvinyl alcohol and specific emulsion
Resin in combination with the resin
It has been found that the use of the resin as the resin is extremely effective in improving the surface strength of the inkjet recording medium. Therefore, the ink jet recording medium of the present invention is made on the basis of the above findings, and at least on the substrate.
Ink receiving consisting of pigment and binder resin on one side
Layer is provided and a gloss adjusting layer is provided on the outermost surface of this ink receiving layer.
An ink jet recording medium provided, the ink receiving medium
As a binder resin for the layer, a portion having a saponification degree of 73 to 85
Both saponified polyvinyl alcohol and emulsion resin
The emulsion resin contains nonionic or
Is a weak anionic ethylene-vinyl acetate emulsion
Resin, isocyanate having cationic substituent
Disperse Ionomer Resin Particles of Copolymer of Polyol and Polyol
Sustainable water-based urethane resin, S
Acrylic esters with cationic substituents on the ter groups
Alternatively, at least one component of methacrylic acid ester
Acrylic ester emulsion resin as a polymerization component
It is characterized by being either . Hereinafter, preferred embodiments 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, and the ink receiving layer is formed in plural layers. It may be present or a gloss adjusting layer may be provided on the ink receiving layer. The materials constituting the substrate, the ink receiving layer and the gloss adjusting layer will be described below.

(1) Substrate The substrate on which the ink receiving layer and the back coat layer used in the present invention are applied is a chemical pulp such as LBKP or NBKP, G
Mechanical pulp such as P, PGW, RMP, TMP, CTMP, CMP, CGP,
Mainly composed of wood pulp such as waste paper pulp such as DIP, and synthetic fiber pulp such as polyethylene fiber, and various additives commonly used in papermaking such as pigments and sizing agents, fixing agents, retention agents, and paper strength agents. Mixing agents as needed, to the base paper manufactured by various devices such as fourdrinier paper machine, cylinder paper machine, twin wire paper machine, and further to the base paper,
Use a size press with starch, polyvinyl alcohol, etc. or a base paper with an anchor coat layer, or coated paper such as art paper, coat paper, cast coat paper with a coat layer on them. be able to. The base paper and the coated paper may be provided with the ink receiving layer as they are, or a calendering machine such as a machine calendar, a TG calendar, or a soft calender that is smoothed before the ink receiving layer coating may be used. good.

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 and the like, a film material of a mixture thereof, or a synthesis thereof. It is also possible to use a medium material obtained by molding a resin into fibers.

(2) Ink-Receiving Layer (a) Binder Resin Water-Soluble Resin As the binder resin contained in the ink-receiving layer in the present invention, a water-soluble resin can be used. For example, polyvinyl alcohol, vinyl acetate, oxidized starch, Examples thereof include etherified starch, cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, casein, gelatin, soybean protein, and silyl-modified polyvinyl alcohol. Of these, partially saponified PVA and carboxylic acid-modified PVA are preferable because they have good adhesiveness and satisfy light resistance and moisture resistance. Particularly, the saponification degree of these PVA is 73.0 to 85.0 mol%. Are more preferred.

Emulsion Resin In the present invention, as the binder resin contained in the ink receiving layer, the water-soluble resin and the emulsion resin may be used alone or in combination. As the emulsion resin, an acrylic emulsion resin such as an ethylene-vinyl acetate copolymer emulsion resin, a water-based urethane resin, an acrylic ester-based or methacrylic ester-based polymer or copolymer, and the like may be used. The characteristics of each emulsion resin are preferably those having any of the following conditions, and more preferably satisfying all of the following conditions.

<Ethylene-vinyl acetate emulsion resin> (1) Partially saponified PVA is used as an emulsion stabilizer. (2) Tg when formed into a film is from -30 ° C to -5 ° C. (3) The ionicity is nonionic or weakly anionic.

<Aqueous Urethane Resin> (1) A suspension formed by dispersing ionomer resin particles of a copolymer of an isocyanate having a cationic substituent and a polyol. (2) The ionicity is cationic. (3) Tg when formed into a film is from -30 ° C to 0 ° C. (4) Partially saponified PVA is used as an emulsion stabilizer.

<Acrylic Emulsion Resin> (1) Copolymerizing at least one component of an acrylic ester or a methacrylic ester having a cationic substituent. (2) The ionicity is cationic. (3) Partially saponified PVA is used as an emulsion stabilizer.

The proportion of the emulsion resin occupied by the binder as a whole in the ink receiving layer is 5 to 5 by weight.
50% by weight is preferred. Since the binder resin is preferably 20 to 50% by weight of the total solid content of the ink receiving layer, the emulsion resin is preferably 1 to 25% by weight. Particularly, 1 to 20% by weight is preferable.

(B) Pigment In the present invention, one or more commonly used water-insoluble or sparingly soluble pigments can be used in the ink receiving layer. 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, pseudoboehmite, aluminum hydroxide, alumina, lithopone, zeolite, hydrohalosite, magnesium carbonate, magnesium hydroxide, etc. White inorganic pigments, styrene plastic pigments, acrylic plastic pigments, organic pigments such as polyethylene, urea resins and melamine resins.

Among the above, as the white pigment contained as the main component in the ink receiving layer, a porous inorganic pigment is preferable because of its excellent drying property and absorption property of the ink-jet ink, and porous synthetic amorphous silica. , Porous magnesium carbonate, porous alumina and the like. Among these, the present invention satisfies both print quality and storage properties (water resistance, abrasion resistance, light resistance, indoor storability, storability against direct sunlight), and has a specific surface area of about 200 to 600 g / m ² . It is preferred to use precipitated and gel type porous amorphous silica.

The blending ratio of the pigment and the binder resin in the ink receiving layer is a binder resin: pigment = 1: weight ratio.
1 to 1:15 is preferable, and 1: 2 to 1:10 is particularly preferable.

(C) Lightfastness improving agent A water-soluble metal salt compound or a cationic dye fixing agent can be added to the ink receiving layer in order to improve lightfastness and various characteristics of an image. These 2
It is more effective to use the components together. In the present invention, “water-soluble” means that when a saturated aqueous solution of a metal salt is prepared using water at 20 ° C. as a solvent, the mass of the inorganic metal salt contained in 100 g of the saturated aqueous solution is 1 g or more in terms of anhydrous mass. In the present invention, among such water-soluble metal salt compounds, metal salt compounds that generate divalent or higher cation metal ions when dissolved in water or the like and ionized are particularly preferable. Specifically, those having excellent effects are magnesium chloride, calcium chloride, barium chloride, tin chloride, lead chloride, magnesium sulfate, calcium sulfate, magnesium chlorate, magnesium phosphate, magnesium nitrate, barium nitrate, calcium nitrate, etc. Is mentioned. The content of these metal salts may be any ratio with respect to the total solid content of the ink receiving layer, preferably 1.0% by weight to 40.0% by weight, and 5.0% by weight to 20.0% by weight. % Is most preferred.

As the cationic dye fixing agent, a polyamine resin is preferably used, specifically, polyvinylbenzyltrimethylammonium halide, polydiacryldimethylammonium halide, polydimethylaminoethylmethacrylate hydrochloride, polyethyleneimine, dicyandiamide formalin condensate. , Epichloropidoline-modified polyalkylamine, polyvinylpyridinium halide, polyethyleneimine quaternary ammonium salt and the like. These have a sufficient effect of improving the light resistance when used alone, but when used in combination with the water-soluble metal salt having a valence of 2 or more, a synergistic effect is obtained, which is preferable. The solid content ratio of the cationic dye fixing agent to the water-soluble metal salt having a valency of 2 or more in the ink receiving layer in order to make the surface strength (glazed crack) and the light resistance compatible with each other in the present invention and improve the effectiveness thereof. Is preferably 4: 1 to 1: 4, most preferably 3: 2 to 1: 1.

(D) Additives Further, in the ink receiving layer, as other additives, a pigment dispersant, a thickener, a fluidity improver, a defoaming agent, a defoaming agent, a release agent, a foaming agent, A penetrant, a coloring dye, a coloring pigment, a fluorescent whitening agent, an antioxidant, an ultraviolet absorber, an antiseptic, a water-proofing agent, a hardener and the like can be appropriately blended as necessary.

(E) Formation of ink receiving layer In order to form the ink receiving layer, the coating liquid 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. , Various blade coaters, roll coaters, air knife coaters, bar coaters, rod blade coaters, size presses, etc.
It is formed by coating on a base material. The ink absorbing layer may be a single layer or may be divided into two or more layers. When two or more layers are provided, the emulsion resin may be contained in each layer, but may be contained only in the surface side layer.

The coating amount of the ink receiving layer is, for example,
First, in the one-layer type, 5 to 30 g / m ² is preferable. 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 5 to 15 g / m ² , and particularly 5 to 1
0 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. is there. Thus, it is preferable to control the coating amount of the ink receiving layer by the number of the ink receiving layers laminated. When two or more ink receiving layers are laminated, the metal salt may be contained in any one ink receiving layer or may be contained in a plurality of ink receiving layers. Here, when a metal salt is added to a plurality of ink receiving layers, it is more preferable that the content of the metal salt is the same in order to further reduce the concentration gradient between the layers.

After the ink receiving layer is applied, it may be finished using a calendar such as a machine calendar, a TG calendar, a super calendar or a soft calendar.

(3) Glossiness adjusting layer In the present invention, it is essential to provide a glossiness adjusting layer containing a binder resin and a pigment on the above-mentioned ink receiving layer.
It is a configuration requirement of. This glossiness adjusting layer can adjust glossiness to produce high-glossy paper, medium-glossy paper, and slightly glossy paper. Also, prevent too much ink from seeping in,
It also has the effect of improving optical density and saturation. As the binder resin forming the glossiness adjusting layer, a water-soluble resin that can be used in combination with the ink receiving layer can be appropriately used. Further, in order to improve recording characteristics such as ink absorbency, it is preferable to use the pigment used in the ink receiving layer described above together with the binder resin in the gloss adjusting layer,
Among them, colloidal silica is particularly preferable because it is excellent in dispersibility and can improve the stability of the coating material and the productivity.

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 are appropriately added to the material forming the gloss adjusting layer, if necessary. can do. The mixing ratio of the binder resin and the pigment in the gloss adjusting layer is preferably binder resin: pigment = 5: 95 to 30:70, and more preferably 5:95 to 20:80 by weight.

For the gloss adjusting layer, a coating liquid prepared by dispersing and dissolving the above materials in an appropriate solvent such as water or an organic solvent is prepared and coated on the ink receiving layer by the same operation as the ink receiving layer. It can be formed by drying. The coating amount of the glossiness adjusting layer is 5 to 2 when directly coating the substrate.
0 g / m ² is preferred. When laminated on the ink receiving layer, the coating amount is preferably 5 to 15 g / m ² , and particularly 5 to 10 g / m ^2.
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 gloss adjusting layer, and bleeding may occur to impair the sharpness of the image. Further, the gloss adjusting layer may be finished by using a calendar such as a machine calendar, a TG calendar, a super calendar or a soft calendar after coating.

[0027]

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 the comparative examples, a base material is a high-quality paper having a basis weight of 90 g / m ² , and a coating liquid prepared by dissolving and dispersing materials having the following composition in water is sequentially applied and dried on one surface of the base material. In this way, an ink receiving layer and a gloss adjusting layer are laminated to provide an ink jet recording medium. Listed in the examples are dry solids weight ratios. The coating amount was 10 g / m ^{2 for} both the ink receiving layer and the gloss adjusting layer unless otherwise specified.

<Example 1> [Ink receiving layer] Binder resin partially saponified PVA Kuraray Co., Ltd .: Kuraray Poval PVA-317 30 wt% Vinyl acetate-ethylene emulsion resin Kuraray: Panflex OM-5500 5 wt% White pigment silica Tokuyama: Fineseal X-37B 45% by weight Light resistance improver Tomita Pharmaceutical: Magnesium chloride S (water-soluble metal salt) 10% by weight Senka: HP-134A (cationic dye fixing) Agent) 10 wt% [Glossiness adjustment layer] Binder resin Maleic acid modified saponified PVA Nippon Synthetic Chemical Co., Ltd .: Gohsenal T-350 10 wt% Colloidal silica Nissan Chemical Industries: Snowtex UP 90 wt% <implementation Examples 2-3, Comparative Examples 1-3> The same material as the ink receiving layer described in Example 1 was used. Te, except that the mixing ratio was changed as shown in Table 1 in the same manner as in Example 1, to obtain an ink jet recording media of Examples 2-3 and Comparative Examples 1-3 of the present invention.

[0029] <Example 4> [Ink receiving layer] ・ Binder resin Partially saponified PVA manufactured by Kuraray Co., Ltd .: 30% by weight of Kuraray Poval PVA-317 Acrylic resin emulsion Shin-Nakamura Chemical Co., Ltd .: NK polymer AC-8                                                                 5% by weight ・ White pigment Silica Tokuyama: Fine seal X-37B 45% by weight ・ Light resistance improver Tomita Pharmaceutical Co., Ltd .: Magnesium chloride S (water-soluble metal salt) 10% by weight Senka Co .: HP-134A (cationic dye fixing agent) 10% by weight [Glossiness Adjustment Layer] Same as in Example 1.

<Examples 5 to 6 and Comparative Example 4> The same procedure as in Example 4 was repeated except that the same material as that of the ink receiving layer described in Example 4 was used and the compounding ratio was changed as shown in Table 1. Ink jet recording media of Examples 5 to 6 and Comparative Example 4 of the present invention were obtained.

[0031] <Example 7> [Ink receiving layer] ・ Binder resin Partially saponified PVA manufactured by Kuraray Co., Ltd .: 30% by weight of Kuraray Poval PVA-317 Water-based urethane resin Asahi Denka Co., Ltd .: ADEKA BONTITER HUX-680                                                                 5% by weight ・ White pigment Silica Tokuyama: Fine seal X-37B 45% by weight ・ Light resistance improver Tomita Pharmaceutical Co., Ltd .: Magnesium chloride S (water-soluble metal salt) 10% by weight Senka Co .: HP-134A (cationic dye fixing agent) 10% by weight [Glossiness Adjustment Layer] Same as in Example 1.

<Examples 8 to 10> The present invention was carried out in the same manner as in Example 7 except that the same materials as those in the ink receiving layer described in Example 7 were used and the mixing ratio was changed as shown in Table 1. The inkjet recording media of Examples 8 to 10 were obtained.

[0033] <Comparative Example 5> [Ink receiving layer] ・ Binder resin Partially saponified PVA manufactured by Kuraray: Kuraray Poval PVA-317 25% by weight Polyester emulsion resin: Dainippon Ink and Chemicals: Finetech ES-22                                                               25% by weight ・ White pigment Silica Tokuyama: Fine seal X-37B 30% by weight ・ Light resistance improver Tomita Pharmaceutical Co., Ltd .: Magnesium chloride S (water-soluble metal salt) 10% by weight Senka Co .: HP-134A (cationic dye fixing agent) 10% by weight [Glossiness Adjustment Layer] Same as in Example 1.

These are shown in Table 1.

[0035]

[Table 1]

Next, the above Examples 1 to 10 and Comparative Examples 1 to 5
Commercially available inkjet printer (manufactured by Seiko Epson Corp., PM-770).
A print image was obtained by printing an evaluation target such as a color patch on the gloss adjusting layer with the aqueous ink using C). Using the image thus obtained, the surface strength (glazed crack), light resistance, and
The moisture resistance was evaluated.

[Evaluation Method] <Glazed> Using the above printer, solid printing with an optical density of black of 1.0 was performed on the obtained ink jet recording medium, and the recording image was lost by the transport roller. The glazed twist was evaluated according to the following evaluation criteria. A: Practically excellent without any problem (no missing). B: Excellent in practical use (some dents on the surface can be seen, but the quality of the recorded image does not deteriorate). C: Excellent in practical use (at least part of the recorded image is lost).

<Light resistance 1 (xenon lamp acceleration test)>
Xenon Weather Ometer (ATLAS, Ci-50
00) is used, and Bk, Y, M, C, R, G, with an optical density of 1.0
Solid printing of B was performed using the printer. For the inkjet recording medium of each example and each comparative example,
Black panel temperature 35 ℃, relative humidity 60%, 340n
An exposure test of 30 KJ / m ² was performed with an m ultraviolet irradiation intensity of 0.18 W / m ² . Then, by using a spectrophotometer (GRETAG SPM50 manufactured by Gretag Macbeth Co., Ltd.), the optical density of each color patch printed on these recording media was measured before and after the exposure test, and the residual ratio of the optical density after the exposure test was measured. (%) Was determined and the light resistance was evaluated according to the following evaluation criteria. A: The residual ratio of optical density exceeds 90%. B: The residual ratio of optical density is more than 80% and less than 90%. C: The residual ratio of optical density is more than 70% and less than 80%. D: The residual ratio of optical density is less than 70%.

<Light resistance 2 (fluorescent lamp acceleration test)> Using a fluorescent lamp acceleration tester (HPUV manufactured by ATLAS), Bk, Y, M, C, R, G and B having an optical density of 1.0 Solid printing was performed using the printer. With respect to the ink jet recording medium of each example and each comparative example, about 6 W / m ² (300
The exposure test was carried out by irradiating only the white fluorescent lamp for 100 hours in the ultraviolet wavelength range of 400 nm to 400 nm). Then
Spectrophotometer (Gretag S manufactured by Gretag Macbeth Co.)
Using PM50), the optical density of magenta of these recording media was measured in the same manner as in the xenon lamp acceleration test of light resistance 1, and the light resistance was evaluated according to the following evaluation criteria. A: The residual ratio of optical density exceeds 90%. B: The residual ratio of optical density is more than 80% and less than 90%. C: The residual ratio of optical density is more than 70% and less than 80%. D: The residual ratio of optical density is less than 70%.

<Humidity resistance> Using a constant temperature and constant humidity chamber, with respect to the ink jet recording medium of each Example and each Comparative Example,
An exposure test was carried out at 32 ° C. and 85% relative humidity for 3 days.
Thick line thin line of each color (Bk, Y, M, C, R, G, B), thin white line (outline) in each color, outline blur of image and color patch (Bk, Y, M, C, The evaluation was performed from the discoloration of R, G, B) at an optical density of 1.0. Especially for discoloration of color patch, spectrophotometer (Gretag Macbeth, G
RETAG SPM50) was used to measure the residual density (%) of the optical density after the exposure test by measuring before and after the exposure test of these recording media, and the moisture resistance was evaluated according to the following evaluation criteria. A: The residual ratio of optical density exceeds 90%. B: The residual ratio of optical density is more than 80% and less than 90%. C: The residual ratio of optical density is more than 70% and less than 80%. D: The residual ratio of optical density is less than 70%.

Table 2 shows the above evaluation results.

[0042]

[Table 2]

From the above results, in Examples 1 to 10, the printing density, sharpness, and ink absorbency, which are the essential conditions for the ink jet recording medium, are very high, and the light resistance, especially the decrease in density and the color tone for the indoor storability are shown. An ink jet recording medium with little change was obtained.

In Examples 1 to 3 and Comparative Examples 1 to 3, the vinyl acetate-ethylene emulsion resin was used to change the compounding ratio. When the amount of the emulsion resin in the total amount of the binder resin was 5 to 50% by weight, The result is that the knurling is improved and at the same time the high light resistance can be maintained. In Comparative Example 1, since there is no emulsion resin, jaggedness is not improved, and in Comparative Example 2, since the emulsion resin is used alone, the ink absorbency is poor. Furthermore, Examples 4 to 6 using an acrylic emulsion resin
Similar results were obtained in Comparative Example 4. Good results were obtained in Examples 7 to 10 using the urethane-modified emulsion resin. In addition, the emulsion resin used in Comparative Example 5 improved the jaggedness, but did not have light resistance. As described above, by using these selected emulsion resins and adding the light resistance improver, it is possible to improve the surface strength (roughness) and maintain high moisture resistance while maintaining high light resistance. An inkjet recording medium was obtained.

As in the above embodiments, the present invention is based on the addition of emulsion resin. At this time, it was confirmed that when the Tg of the emulsion resin was selected from −30 ° C. to 0 ° C., an inkjet recording medium having a well-balanced coating property, light resistance, ink absorbability and the like was obtained. In particular, in the case of vinyl acetate-ethylene emulsion resin, the range of -30 ° C to -5 ° C was more preferable. Further, it was confirmed that even if two or more kinds of the emulsion resins mentioned in the above-mentioned examples are mixed and used, the light resistance is not deteriorated and the jaggedness is improved.

[0046]

As described above, according to the present invention, it is preferable that the binder resin of the ink receiving layer of the ink jet recording medium contains at least a water-soluble or water-dispersible resin and an emulsion resin. It is possible to obtain an inkjet recording medium which has excellent ink jet recording characteristics by which a clear image without bleeding can be obtained due to the ink absorptivity, and which also has excellent light resistance and surface strength (jaggedness). In addition, in the present invention, the use of the specific emulsion resin as described above 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 continued (72) Inventor Jun Sugiyama 3-5 Yamato, Suwa City, Nagano Seiko Epson Corporation (72) Inventor Takayuki Ishikawa 3-1, Soba Town, Shizuoka City, Shizuoka Prefecture Stock Company Tomoegawa Paper Mill, Western Paper Division (72) Inventor Nobuhiro Kubota No. 3 Munemachicho, Shizuoka-shi, Shizuoka Prefecture Stock Company, Takagawa Paper Mill, Western Paper Division (72) Inventor Takeshi Yoshimoto 3 Munezawacho, Shizuoka-shi No. 1 In stock company, Tomoegawa Paper Mill, Paper Division (72) Inventor Shigeki Asai No. 3 Somyo-cho, Shizuoka City, Shizuoka Prefecture In stock, Tomagawa Paper Mill, Paper Division (72) Inventor Minoru Tsuchida Shizuoka Prefecture 3-1, Soba-cho, Shizuoka-shi In the paper division of Tomoegawa Paper Co., Ltd. (72) Inventor Kiyoshi Iwamoto 3-1, No. 1, Soba-machi, Shizuoka-shi, Shizuoka In-house Paper Division of Tomoegawa Paper Mill (56) References JP-A-11-99738 (JP, A) JP-A-10-278416 (JP, A) JP-A-11-99741 (JP, A) JP-A-10-226154 ( P, A) JP 9-254531 (JP, A) JP 11-78216 (JP, A) JP 8-338000 (JP, A) JP 9-290560 (JP, A) JP 6-320857 (JP, A) JP 11-20304 (JP, A) JP 9-99633 (JP, A) JP 62-83178 (JP, A) JP 5-246130 (JP , A) JP 9-99632 (JP, A) JP 9-183938 (JP, A) JP 9-104160 (JP, A) JP 10-86505 (JP, A) JP 8-187932 (JP, A) JP-A-11-58940 (JP, A) JP-A-10-25672 (JP, A) JP-A-10-157286 (JP, A) JP-A-10-278411 (JP, A) A) JP-A-6-55830 (JP, A) JP-A-9-157611 (JP, A) JP-A-9-176995 (JP, A) JP-A-61-74880 (JP, A) JP-A-61 -43593 (JP, A) JP 2000-158805 (JP, A) JP 11-180030 (JP, A) JP 2000-247018 (JP, A) Open 2000-280610 (JP, A) JP 2000-153667 (JP, A) JP 2000-280615 (JP, A) JP 9-11609 (JP, A) JP 9-226231 (JP, A) ) (58) Fields investigated (Int.Cl. ⁷ , DB name) B41M 5/00

Claims (13)

(57) [Claims] 1. An ink receiving layer comprising a pigment and a binder resin is provided on at least one surface of a substrate, and the ink receiving layer is provided .
An inkjet recording medium having a glossiness adjusting layer on the outermost surface of the click-receiving layer, as a binder resin of the ink receiving layer, partially saponified degree of saponification 73-85 Poribinirua
An ink jet recording medium comprising both a diol and an emulsion resin, the emulsion resin being a nonionic or weakly anionic ethylene-vinyl acetate emulsion resin. Wherein at least an ink receiving layer comprising a pigment and a binder resin on one surface of the substrate provided, this in
An inkjet recording medium having a glossiness adjusting layer on the outermost surface of the click-receiving layer, as a binder resin of the ink receiving layer, partially saponified degree of saponification 73-85 Poribinirua
The emulsified product containing both rucor and emulsion resin
John resin dispersed ionomer resin particles of copolymer of isocyanate and polyol having cationic substituent
An ink jet recording medium, characterized in that it is a water-based urethane resin that has been suspended . Wherein an ink-receiving layer comprising a pigment and a binder resin provided on at least one surface of the substrate, this in
An inkjet recording medium having a glossiness adjusting layer on the outermost surface of the click-receiving layer, as a binder resin of the ink receiving layer, partially saponified degree of saponification 73-85 Poribinirua
The emulsified product containing both rucor and emulsion resin
Ink jet recording medium, wherein the John resin is an acrylic ester emulsion resin to copolymer component at least one component of an acrylic acid ester or methacrylic acid ester having a cationic substituent to the ester group. 4. An emulsion resin having a Tg of the resin of −30 ° C. to 0 ° C. is used .
The ink jet recording medium according to any one of claims. 5. The binder resin of the ink receiving layer is a partial
A saponified polyvinyl alcohol, vinyl acetate - ethylene, urethane, inkjet according to any one of claims 1 to 4, characterized in that it comprises a two or more emulsion resin selected from acrylic and methacrylic Recording medium. 6. The amount of the emulsion resin in the binder resin amount in the ink receiving layer is an ink jet recording medium according to any one of claims 1 to 5, characterized in that 5 to 50% by weight. The amount of 7. The emulsion resin is claim, characterized in that 1 to 25 wt% of the total ink receiving layer 6
The ink jet recording medium according to item 1. 8. The inkjet recording medium according to any one of claims 1 to 7, wherein the pigment is silica and / or alumina. 9. claimed in any one of claims 1-8, characterized in that it comprises two components of divalent or more water-soluble metal salt and a cationic dye fixing agent as a light resistance improving agent in the ink receiving layer Inkjet recording medium. 10. The light resistance improver is magnesium chloride,
The inkjet recording medium according to claim 9 , comprising at least one water-soluble metal salt selected from magnesium sulfate and calcium chloride. 11. The amount of the light resistance improver with respect to the entire ink receiving layer is 1.0% by weight to 40.0% by weight, and more preferably 5.0% by weight to 20.0% by weight. The inkjet recording medium according to claim 10 , wherein the medium is an inkjet recording medium. 12. The cationic dye fixing agent in the ink receiving layer has a solid content ratio of 4: 1 to 1: 4 with respect to a water-soluble metal salt having a valence of 2 or more. 11
The ink jet recording medium according to item 1. 13. An ink jet recording method characterized by comprising a combination of ink jet recording medium and the aqueous ink according to any one of claims 1 to 12.