JP2001277701A - Cut sheet-like ink jet recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording medium, which has a high ink absorbency, excellent image coloring properties and photographic external appearance in order to easily obtain photographic printed matters by printing highly precise images or the like with an ink jet printer or the like under the condition that the medium can easily be set to an ink jet printer on hand without purchase of special optional parts so as to obtain meander-free printed matters with a few waste. SOLUTION: This ink jet recording sheet is produced by providing an inorganic pigment or adhesive-containing ink accepting layer and has a cut sheet having the ratio of the longitudinal length to the lateral breadth of the cut sheet in the range of 2.5-7.0 to 1 of breadth. The preferable shape of the recording medium has a lateral breadth of 182 mm or less. More preferably, the ink accepting layer is excellent in gloss and absorbency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording medium for recording using ink, and more particularly, to an ink-jet recording medium having high ink absorbency, excellent image color, and obtaining a photographic-like print. And the shape of the ink jet recording medium to be used.

[0002]

2. Description of the Related Art Ink-jet recording is a method in which fine droplets of ink are made to fly and adhere to a recording medium such as paper by various operating principles to record images and characters. It has features such as easy multi-coloring, great flexibility in recording patterns, and no need for development-fixing, and is rapidly spreading in various applications as a printer for various figures and color images including kanji. . Further, an image formed by the multi-color ink jet system can obtain a record comparable to multi-color printing by a plate making system or printing by a color photographic system. In applications where the number of copies required is small, it is being widely applied to the field of full-color image recording because it is cheaper than the photographic technique.

[0003] In addition, the cost of ink jet printers has been reduced,
Inkjet printers can be changed from special printers used by specific people to general-purpose printers because images with excellent image reproducibility and color reproducibility such as sharpness and color reproducibility can be easily obtained at the personal computer level. In recent years, in particular, in recent years, ink jet printers have been further enhanced in definition, and the appearance of photographic quality and image storability has appeared at a low price, so that the ratio of personal possession has also increased significantly. .

Further, with the development of digital cameras, the number of pixels of recorded images has been dramatically improved, so that there are many opportunities to take photographic images into a computer or directly output from a digital camera to these inkjet printers. I have. However, photographic images with a small number of pixels
For example, when the image is output on a large screen such as an A4 size, the roughness of the number of pixels becomes visible, and the image quality is not improved. Even in such a case, the roughness of the number of pixels is not conspicuous if the image is output to a photo L plate or postcard size. Also, if you output a large image even with a digital camera with a large number of pixels, the cost of paper and ink will increase, so
In many cases, it is sufficient to output a photo L version or postcard size.

[0005] Usually, a recording medium supplied to an ink jet printer is supplied in the form of a standardized A or B plate cut sheet or wound in a roll. In particular, most of the personal use is supplied in A4 size cut sheets. Alternatively, as an ink jet recording medium stating the photographic quality, a cut sheet of a postcard size or a roll type of 89 mm width and 100 mm width may be supplied.

On the other hand, an ink jet printer as a color output device of a personal computer has been remarkably developed, and an ink jet printer which claims photographic quality has become easily available. In addition, since high-quality images can be easily taken into a personal computer from a digital camera or the like, there are many uses for making photographic-quality color prints by oneself. However, general-purpose inkjet printers are often designed to handle cut sheets, and when using photographic-quality inkjet recording media, it is necessary to install an auxiliary device so that roll-paper-type recording media can be set. There is. Since the roll-type recording medium is wound in a small roll shape, the more the center, the more the curl called a curl occurs. Further, when printed, a roll-shaped material tends to meander rather than travel straight along a transport path, and an image may not be printed parallel to the paper width. In addition, when the image is output to the size of a normal cut sheet (A4 size), the image resolution is insufficient and the roughness becomes visible. In this case, an unnecessary portion is generated in the A4 size, and the portion to be trimmed and discarded after printing increases.

[0007] As the performance of these inkjet printers and the diversification of uses have been increased, the characteristics and requirements required of the ink jet recording medium have been considerably increased. In particular, printers that claim high-definition images and printers that can print large-format images use a large amount of ink to form images, and improve the ink-receiving layer to absorb ink. Is also progressing.

[0008] Further, diversification of uses has also occurred with respect to the appearance of ink jet recording media. In addition to the conventional glossy or low gloss appearance of plain paper or matte paper, art paper, coated paper, cast paper, There is a demand for an appearance having gloss similar to paper, photographic paper, and the like. This is because ink jet recording can reproduce image quality comparable to printing or photography, and there is a demand for a similar appearance.

As an ink jet recording medium having enhanced surface gloss, a medium in which an ink receiving layer made of a resin is provided on a support has been disclosed. Examples of resins used in such applications include, for example, JP-A-57-38185,
Polyvinylpyrrolidone, vinylpyrrolidone-vinyl acetate copolymer described in JP-A-62-184879, JP-A-60-168651, JP-A-60-17
Nos. 1143 and 61-134290, resin compositions mainly comprising polyvinyl alcohol, and vinyl alcohol and olefin or styrene and maleic anhydride as disclosed in JP-A-60-234879. Copolymers with acids, crosslinked products of polyethylene oxide and isocyanates as disclosed in JP-A-61-74879, JP-A-61-181679
Mixture of carboxymethyl cellulose and polyethylene oxide as disclosed in
A polymer obtained by grafting methacrylamide onto polyvinyl alcohol as disclosed in JP-A-132377, an acrylic polymer having a carboxyl group as disclosed in JP-A-62-220383,
Polyvinyl acetal polymer disclosed in JP-A-4-214382 and the like;
There are various ink-absorbing resins such as a crosslinkable acrylic polymer as disclosed in JP-A-282 and JP-A-4-285650. Also, JP-A-4-282282, JP-A-4-282282.
JP-A-285650 and the like disclose an ink jet recording medium in which a polymer matrix composed of a crosslinkable polymer and an absorbing polymer are used in combination. However, although the ink receiving layer made of these resins has a higher surface gloss than the ink receiving layer made of fine pigment particles such as silica, it has a drawback that the drying speed is slow and the absorption amount is small.

Inkjet recording media using alumina hydrate (cationic alumina hydrate) have recently been disclosed as ink jet recording media having a high ink drying rate and improved surface gloss. Kaisho 60-
As disclosed in JP-A-232990, JP-A-60-245588, JP-B-3-24906, JP-A-6-199035 and JP-A-7-82694, water-soluble fine pseudoboehmite-type alumina hydrate is prepared. There is an ink jet recording medium coated on the surface of a support together with a binder. However, an ink jet recording medium using pseudo-boehmite-type alumina hydrate has very high surface gloss, but has a small pore volume, and as described in JP-A-5-24335, for example. In addition, the ink absorption capacity is small, and thick film coating is necessary to obtain a sufficient ink absorption capacity.

[0011] For example, Japanese Patent Application Laid-Open No. Hei 10-203006 discloses an ink jet recording medium having a primary particle diameter of 3 nm to 30 nm and mainly using synthetic silica obtained by a gas phase method. Also in this case, in order to obtain a sufficient absorption capacity, a film thickness of 30 μm or more is required.
Such a thick-film-coated inkjet recording medium,
When placed in a rolled state, there is a disadvantage that the curl tends to be formed.

On the other hand, Japanese Patent Application Laid-Open No. 7-89217 discloses an ink jet recording medium in which a base paper provided with an ink receiving layer is provided with an uneven pattern. This is characterized in that an irregular pattern is formed on the surface of a base paper mainly composed of cellulose pulp, and an ink receiving layer mainly composed of a white pigment and a binder resin is provided thereon. However, in this method, since the base paper is a paper containing cellulose pulp as a main component, the ink receiving layer made of a forming material requiring a thick film coating such as alumina hydrate or fumed silica as described above is used. However, the effect of providing an uneven pattern hardly appears, and a sufficient aesthetic effect was not obtained.

Japanese Patent Application Laid-Open No. 9-86034 discloses an ink jet recording medium having a glossy and moldable pattern by forming a glossy ink receiving layer and then embossing the ink receiving layer. However, in this method, it is necessary to first form a glossy ink receiving layer by a casting method or the like, and then mold the surface with an embossing machine or the like, so that the manufacturing process becomes complicated. In addition, since there is a gloss imparting step by a casting method, the support needs to have air permeability, and a film or synthetic paper without air permeability,
Alternatively, there is a drawback that it cannot be produced with resin-coated paper.

[0014]

SUMMARY OF THE INVENTION An object of the present invention is to print a high-definition image or the like with an ink-jet printer or the like so as to easily obtain a photographic-like print. It has absorptivity, excellent image color and photo-like appearance, and can be easily set without purchasing special optional parts for hand-held inkjet printer. To provide an ink jet recording medium that can be used.

[0015]

The ink jet recording medium of the present invention is a recording medium in which an ink receiving layer containing an inorganic pigment and an adhesive is provided on a support, and the shape of the recording medium is a width. 1 is a cut sheet type ink jet recording medium, wherein the vertical length is 2.5 or more and 7.0 or less. The recording medium has a width of 182 m.
m or less, and more preferably 148 mm or less in width.

A preferred form is one in which the ink receiving layer is provided with high gloss by a casting method.

The inorganic pigment is preferably ultrafine silica or alumina hydrate synthesized by a gas phase method, and more preferably the alumina hydrate has a pseudo-boehmite structure.

The support is preferably a resin-coated paper in which a thermoplastic resin coating layer is provided on paper, a white film, or a synthetic paper. The thermoplastic resin is a polyolefin resin, and among them, polyethylene. Resins or polypropylene resins are more preferred. It is further preferred that the coating layer of the thermoplastic resin contains a pigment.

Further, it is preferable that the thickness of the support is 150 μm or more, since the effects of the present invention can be more exhibited.

Further, on the surface of the support on which the ink receiving layer is provided,
The one with the mold is a preferred form. A preferred form is one in which the coating layer of the thermoplastic resin-coated paper is formed by being pressed against a cooling roller having a desired shape at the time of melt extrusion coating of the thermoplastic resin.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The ink jet recording medium of the present invention will be described below in detail.

The ink jet recording medium of the present invention is in the form of a cut sheet having a length of 2.5 or more and 7.0 or less with respect to a width of 1. By adopting this shape, A4
Eliminates wasted margins when printing small photographic quality images on plates, eliminates the need for jigs for mounting photographic quality recording media supplied in roll type, and has curl and printing paper that are disadvantages of roll type. A recording medium without meandering can be provided.

The width is 89 mm, 100 mm, 148 m
m, 182 mm, etc., and the vertical length is from 2.5 to 7.0 times the horizontal width. However, it is preferable that the length be such that it fits with a margin. The smaller the width is, the more effective it is. It is effective if the width is smaller than 182 mm (long side length of B5 plate). More effective against meandering. In this case, the paper has a length (machine direction) and a width (cross direction), but has no relation to the length and width of the recording medium of the present invention. That is, it is also possible to cut the recording medium in the width direction of the cut sheet recording medium.

The ink jet recording medium to be cut into the shape of the present invention is not particularly limited as long as it has an ink receiving layer for ink jet recording, but high resolution, high color saturation and high gloss for photographic image quality are sought. In addition, an ink jet recording medium having good storage stability can be preferably used. These recording media are preferably provided with an ink receiving layer containing an inorganic pigment and an adhesive constituting a porous absorbent layer on a support.

The support used in the present invention is paper,
Fabric, synthetic paper, resin-coated paper, opaque film with pigment,
Foamed films, transparent films and the like can be mentioned. In order to obtain a photograph-like printed image, synthetic paper, resin-coated paper, and an opaque film containing pigment (white film) are preferable. In particular, a resin-coated paper similar to a photographic support is more preferably used from the viewpoint of a feeling of touch, a sense of quality, and ease of molding.

The base paper for resin-coated paper preferably used in the present invention is not particularly limited, and generally used paper can be used. Preferably, for example, a base paper used for a photographic support is used. Smooth and dense base paper. As the pulp constituting the base paper, a natural pulp, a recycled pulp, a synthetic pulp, or the like is used alone or in combination of two or more. As the natural pulp, bleached chemical pulp such as pulp usually used for papermaking, that is, softwood kraft pulp, hardwood kraft pulp, softwood sulphite pulp, hardwood sulphite pulp and the like can be used. Further, mechanical pulp having high whiteness may be used. Further, non-wood pulp manufactured from grass fibers such as straw, esparto, bagasse, and kenaf, bast fibers such as hemp, mulberry, ganpi, mitsumata, and cotton, may be used. Of these, bleached chemical pulp, such as softwood kraft pulp, hardwood kraft pulp, softwood sulphite pulp, and hardwood sulphite pulp, which is usually most frequently used industrially, is particularly preferred.

Pulp is used in order to improve papermaking suitability and various properties of paper such as strength, smoothness, formation uniformity and the like.
It is usually beaten by a beater such as a double disc refiner. The degree of beating is 250 ml to 450 ml in Canadian Standard Freeness (CSF).
Can be selected according to the purpose within the usual range.

The beaten pulp slurry is made by a papermaking apparatus such as a fourdrinier paper machine, a twin wire paper machine, or a round net paper machine. In the present invention, the pulp slurry usually used in papermaking is used. Various additives such as a dispersing aid, a dry paper strength enhancer, a wet paper strength enhancer, a filler, a sizing agent, and a fixing agent can all be added as needed. Further, if necessary, a pH adjuster, a dye, a colored pigment, an optical brightener and the like can be added.

The dispersing aids include, for example, polyethylene oxide, polyacrylamide, smelt, and the like. The paper strength enhancers include, for example, vegetable gums, starches, anionic paper strength enhancers such as carboxy-modified polyvinyl alcohol, cationized starch, and the like. Cationic polyacrylamide, a cationic paper strength enhancer such as polyamide polyamine epichlorohydrin resin, as a filler, for example, clay, kaolin,
Talc, calcium carbonate, barium sulfate, titanium oxide,
Aluminum hydroxide, magnesium hydroxide and the like, as sizing agents, for example, higher fatty acid salts, rosin, rosin derivatives such as maleated rosin, dialkyl ketene dimer, alkenyl or alkyl succinate, epoxidized fatty acid amide, polysaccharide ester and the like Examples of the fixing agent include polyvalent metal salts such as aluminum sulfate and aluminum chloride, cationic polymers such as cationized starch and polyamide polyamine epichlorohydrin resin, and examples of the pH adjusting agent include hydrochloric acid, caustic soda, and sodium carbonate.

The base paper for resin-coated paper used in the present invention can be tab-sized or size-pressed with a liquid containing various additives including a water-soluble polymer additive. .

Examples of the above-mentioned water-soluble polymer additives include starch derivatives such as starch, cationized starch, oxidized starch, etherified starch and phosphate esterified starch; polyvinyl alcohol derivatives such as polyvinyl alcohol and carboxy-modified polyvinyl alcohol; Carboxymethyl cellulose,
Hydroxymethyl cellulose, hydroxyethyl cellulose, cellulose derivatives such as cellulose sulfate,
Gelatin, casein, water-soluble natural polymers such as soy protein,
Sodium polyacrylate, sodium salt of styrene-maleic anhydride copolymer, water-soluble polymer such as maleic anhydride resin such as sodium polystyrene sulfonate, and aqueous polymer such as thermosetting synthetic resin such as melamine resin and urea resin Adhesives and the like are used. In addition, petroleum resin emulsions, ammonium salts of styrene-maleic anhydride copolymer alkyl esters, alkyl ketene dimer emulsions, styrene-butadiene copolymers, ethylene-vinyl acetate copolymers are used as sizing agents. Dispersions of polymers, polyethylene, polyvinylidene chloride and the like can be mentioned. Other additives include an inorganic electrolyte such as sodium chloride, calcium chloride, and boa nitrate as antistatic agents, glycerin and polyethylene glycol as hygroscopic substances, and clay, kaolin, talc, barium sulfate, and oxidized as pigments. Titanium or the like is used as a pH adjusting agent such as hydrochloric acid, caustic soda, or sodium carbonate, and other additives such as a dye, a fluorescent whitening agent, an antioxidant, and an ultraviolet absorber can be used in combination.

The base paper for resin-coated paper used in the present invention preferably has good surface smoothness such as compression by applying pressure with a calender or the like during or after papermaking.
Beck's smoothness measured by JIS-P-8119 is 20
Those having 0 seconds or more are particularly preferably used. The basis weight is preferably from 30 to 250 g / m ² .

As a resin for coating the resin-coated paper, a thermoplastic resin or a resin which is cured by an electron beam can be used.
Examples of the thermoplastic resin include a polyolefin resin and a polyester resin. As polyolefin resin,
It is a homopolymer of an olefin such as low-density polyethylene, high-density polyethylene, polypropylene, polybutene, or polypentene, or a copolymer composed of two or more olefins such as an ethylene-propylene copolymer, and a mixture thereof. Examples of the polyester resin include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. These thermoplastic resins having various densities and melt viscosity indices (melt index) can be used alone or in combination. Preferably, polyethylene resin and polypropylene resin are used.

In the resin of the resin-coated paper, white pigments such as titanium oxide, zinc oxide, talc and calcium carbonate, fatty acid amides such as stearamide, arachidic amide, zinc stearate, calcium stearate, stearic acid Aluminum, metal salts of fatty acids such as magnesium stearate, pigments and dyes of blue such as cobalt blue, ultramarine blue, cecilian blue, and phthalocyanine blue; pigments and dyes of magenta such as cobalt violet, fast violet, and manganese purple; fluorescent brighteners; It is preferable to add various additives such as an ultraviolet absorber and an antioxidant in an appropriate combination.

The resin-coated paper as a support preferably used in the present invention is a so-called resin-coated paper in which, when the coating resin is a thermoplastic resin such as a polyolefin resin or a polyester resin, the resin melted by heating and melting is cast on a running base paper. It is manufactured by an extrusion coating method, and the side on which the ink receiving layer is provided or both sides is coated with a resin. When the coating resin is a resin that is cured by an electron beam, the resin is applied by a commonly used coater such as a gravure coater or a blade coater, and then irradiated with an electron beam to cure and coat the resin. Before coating the resin on the base paper,
Preferably, the base paper is subjected to an activation treatment such as a corona discharge treatment or a flame treatment. The surface of the support on which the ink receiving layer is applied may be a glossy surface, a matte surface, or the like, depending on the application. In the present invention, the surface is a specular glossy surface or a silky, mesh-like, canvas-like, fine-grained surface. And the like, in which various irregular patterns such as the above are formed on the surface thereof are preferably used.

Although it is not necessary to coat the back surface with a resin, it is preferable to coat the resin from the viewpoint of preventing curling. The back surface is usually a matte surface, and the front surface or both front and back surfaces can be subjected to an activation treatment such as a corona discharge treatment or a flame treatment as required. The thickness of the coating resin layer is not particularly limited, but is generally 5 to 50 μm on the surface or both surfaces on which the ink receiving layer is applied.

In the production of a resin-coated paper which is preferably used in the present invention, the surface of which has been subjected to the imprinting of various uneven patterns such as a specular gloss surface or a silk-like, mesh-like, canvas-like or fine-grained surface. Is produced by heating and melting a polyolefin resin or the like with an extruder, extruding a film between a sheet-like substrate such as paper and a cooling roll, pressing and cooling. The cooling roll is used to form the surface shape of the resin coating layer,
The surface of the resin-coated paper can be formed into a specular gloss, a matte, or a patterned, for example, a silk-like or mat-like shape depending on the shape of the cooling roll surface. In the present invention, using a mirror-finished or finely roughened cooling roll, forming a resin coating layer on the side where the ink receiving layer is provided,
In the case of mirror finishing, it is used as it is as mirror glossy paper,
In the case of embossing a concavo-convex pattern, there is a method in which various embossing patterns such as silk, mesh, canvas, and fine-grained surfaces are thereafter formed into a desired shape by an embossing machine. In the production of resin-coated paper, there is also a method in which a desired pattern is formed by copying the pattern with a cooling roll having a desired pattern engraved on the surface in advance. The resin-coated paper having an embossed pattern preferably used in the present invention is a resin-coated paper on which a desired embossing machine is applied by using an embossing machine, or more preferably, using a cooling roll engraved with a desired embossing pattern. This is a resin-coated paper that was simultaneously molded when producing the resin-coated paper.

As the inorganic pigment contained in the ink receiving layer in the ink jet recording medium of the present invention, any conventionally known inorganic pigment can be used. For example, silica (colloidal silica, amorphous silica), alumina or alumina hydrate (alumina sol, colloidal alumina, cationic aluminum oxide or hydrate thereof, pseudoboehmite, etc.), aluminum silicate, magnesium silicate, magnesium carbonate , Light calcium carbonate, heavy calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, diatomaceous earth, calcium silicate, aluminum hydroxide, lithopone, zeolite, water Halloysite, magnesium hydroxide and the like. Furthermore, styrene plastic pigment, acrylic plastic pigment, polyethylene, microcapsules, urea resin,
Use of an organic pigment such as a melamine resin may be used at all.

Among these inorganic pigments, porous inorganic pigments are preferable, and examples thereof include synthetic amorphous silica, porous magnesium carbonate, and porous alumina hydrate. Inorganic pigments having a primary particle diameter of 100 nm or less, such as pseudo-boehmite of alumina hydrate, can be preferably used.

The inorganic pigments having a primary particle diameter of 100 nm or less which can be preferably used in the present invention include, for example, JP-A-1-9
Nos. 7678, 2-275510 and 3-2
81383, 3-285814, 3-
285815, 4-92183, 4-
Pseudo-boehmite sols disclosed in JP-A-267180 and JP-A-4-275917, and JP-A-60-219.
Nos. 083, 61-19389, 61-1
JP-A-88183, JP-A-63-178074, and colloidal silica disclosed in JP-A-5-51470, JP-B-4-19037, and JP-A-62-286787. Silica / alumina hybrid sol as described in JP-A-10-1194
No. 23, JP-A-10-217601, silica sol obtained by dispersing synthetic amorphous silica with a high-speed homogenizer, and smectite clay such as hectite and montmorillonite (JP-A-7-81210). Publication), zirconia sol, chromia sol, yttria sol, ceria sol, iron oxide sol, zircon sol, antimony oxide sol, and the like.

As the synthetic amorphous silica preferably used in the present invention, among the above, silica fine particles synthesized by a gas phase method, among which ultrafine silica having an average primary particle diameter of 3 nm to 100 nm, are preferable. Particularly preferred primary particle size is 4
nm to 50 nm. Further, the secondary particles to which these are connected are preferably 10 nm to 200 nm, more preferably 15 nm to 100 nm. Aerosil (Texa) corresponds to a commercially available product as amorphous silica fine particles synthesized by the gas phase method.

The alumina hydrate used in the present invention can be represented by the following general formula. Al ₂ O ₃ .nH ₂ O alumina hydrate is classified into gypsite, vialite, norstrandite, boehmite, boehmite gel (pseudo boehmite), diaspore, amorphous amorphous, etc. according to the difference in composition and crystal form. You. Among them, in the above formula, when the value of n is 1, it represents an alumina hydrate having a boehmite structure, and when n is more than 1 and less than 3, it represents an alumina hydrate having a pseudo-boehmite structure; When it is 3 or more, it represents an alumina hydrate having an amorphous structure. In particular, alumina hydrates preferred for the present invention are those having a pseudo-boehmite structure in which at least n is more than 1 and less than 3.

In order for the alumina hydrate to have a sufficient ink absorption rate, the average pore radius of the alumina hydrate should be 1 to 1
The thickness is preferably 0 nm, particularly preferably 3 to 7 nm. If the pore radius is too small, it becomes difficult to absorb the ink. If the pore radius is too large, fixation of the dye in the ink is deteriorated, and image bleeding occurs.

In order for the alumina hydrate to have a sufficient ink absorption capacity, the pore volume of the alumina hydrate is preferably in the range of 0.3 to 0.8 ml / g.
It is preferably in the range of 0.4 to 0.6 ml / g. When the pore volume of the ink receiving layer is large, cracks and powder fall occur in the ink receiving layer, and when the pore volume is small, absorption of the ink becomes slow. Further, the solvent absorption amount of the ink receiving layer per unit area is preferably 5 ml / m ² or more, particularly preferably 10 ml / m ² or more. When the amount of solvent absorption per unit area is small, ink may overflow especially when multicolor printing is performed.

In order for the alumina hydrate to sufficiently absorb and fix the dye in the ink, the BET specific surface area should be 70 to 300.
It is preferably in the range of m ² / g. If the BET specific surface area is too small, the pore size distribution tends to be large, and the fixing efficiency of the dye in the ink is deteriorated, and image bleeding occurs. Conversely, if the BET specific surface area is too large, it becomes difficult to disperse the alumina hydrate.

The shape of the alumina hydrate used in the present invention may be any of a flat plate shape, a fibrous shape, a needle shape, a spherical shape, a rod shape and the like, and a preferable shape is a flat plate shape from the viewpoint of ink absorption. The plate-like alumina hydrate has an average aspect ratio of 3
-8, preferably an average aspect ratio of 3-6. Aspect ratio is the "diameter" of the particle "thickness"
It is expressed by the ratio of Here, the diameter of the particle means the diameter of a circle equal to the projected area of the particle when the alumina hydrate is observed with an electron microscope. When the aspect ratio is smaller than the above range, the pore size distribution of the ink receiving layer becomes narrow, and the ink absorbency decreases. On the other hand, when the aspect ratio exceeds the above range, it becomes difficult to prepare alumina hydrate by aligning the particles.

The alumina hydrate used in the present invention can be produced by a known method such as hydrolysis of aluminum alkoxide such as aluminum isopropoxide, neutralization of aluminum salt with alkali, hydrolysis of aluminate, and the like. . The physical properties of alumina hydrate, such as particle diameter, pore diameter, pore volume, and specific surface area, should be controlled by conditions such as precipitation temperature, aging temperature, aging time, liquid pH, liquid concentration, and coexisting compounds. Can be.

As a method for obtaining an alumina hydrate from an alkoxide, JP-A-57-88074 and JP-A-62-88074 describe the method.
No. 56321, JP-A-4-275917, JP-A-6-64918, JP-A-7-10535,
-267633, U.S. Pat. No. 2,656,321
Patent Document 1 discloses a method for hydrolyzing aluminum alkoxide. These aluminum alkoxides include isopropoxide, 2-butoxide and the like.

Also, Japanese Patent Application Laid-Open No. 54-116398,
JP-A-55-23034, JP-A-55-27824 and JP-A-56-120508 disclose a method using an aluminum inorganic salt or a hydrate thereof as a raw material. Examples of the raw material include inorganic salts such as aluminum chloride, aluminum nitrate, aluminum sulfate, polyaluminum chloride, ammonium alum, sodium aluminate, potassium aluminate, and aluminum hydroxide, and hydrates thereof.

As still another method, Japanese Patent Application Laid-Open No. 56-120
No. 508, a method in which the pH is alternately changed from an acidic side to a basic side to grow alumina hydrate crystals, and aluminum as described in Japanese Patent Publication No. 4-33728. There is also a method of mixing alumina hydrate obtained from an inorganic salt of the above with alumina obtained by the Bayer method, and rehydrating the alumina.

A water-soluble or water-insoluble polymer compound may be added as a binder for the inorganic pigment used in the present invention. The polymer compound used in the present invention is a compound having an affinity for ink as a component of the ink receiving layer. For example, as the water-soluble polymer compound, polyvinyl alcohol, acrylic resin, styrene-acrylic copolymer, maleic anhydride polymer, styrene-maleic anhydride copolymer, ethylene-vinyl acetate copolymer, starch, polyvinyl butyral, Gelatin, casein, ionomer, gum arabic, carboxymethylcellulose, alginic acid, sodium alginate, pullulan, polyvinylpyrrolidone, polyacrylamide, polyethylene glycol, polypropylene glycol and the like. Preferably, it is polyvinyl alcohol.

As the water-insoluble polymer compound, alcohols such as ethanol and 2-propanol and a water-insoluble binder dissolved in a mixed solvent of these alcohols and water can stabilize the dispersion of aluminum oxide. Is particularly preferred. Examples of such a water-insoluble binder include acetal resins such as a vinylpyrrolidone / vinyl acetate copolymer, polyvinyl butyral, and polyvinyl formal. Particularly, the degree of acetalization is 5 mol%.
The acetal resin in the range of not less than 20 mol% is particularly preferable because it can contain water to some extent and can easily disperse the inorganic ultrafine particles.

These polymer compounds may be used alone or in combination of two or more, and 2 to 70% by weight is added to the inorganic pigment. Preferably, 5 to 40% by weight is added. If the amount is less than the above range, the strength of the coating film becomes weak, and if it is too large, the ink absorbency decreases.

The method for applying the coating liquid in the present invention is as follows.
E-bar coating, curtain coating, strado hopper coating, extrusion coating, roll coating, air knife coating,
Various coating methods such as gravure coating and rod bar coating can be adopted.

In the present invention, the ink receiving layer may have a single layer structure or a multilayer structure. In the case of a laminated structure, all layers may be layers having the same composition, or may be a laminated structure with a layer composed of other components.

The coating amount of the ink receiving layer containing the inorganic pigment of the present invention is 10 per square meter in terms of solid content.
g or more, more preferably 15 g or more and 60 g or less per unit square meter, in order to recognize the further effect of the present invention.

As a means for drying after coating, a general known method can be used and is not limited. For example,
There are a method of transporting the heated air generated by the heat source into the heated heater, and a method of passing the air near the heat source such as a heater.

Further, a coating liquid for forming an ink receiving layer containing the inorganic pigment of the present invention and, if necessary, a binder may contain, if necessary, a surfactant, an inorganic pigment, a coloring dye, a coloring pigment, and an ink dye fixing agent. Known agents such as an agent (cationic resin), an ultraviolet absorber, an antioxidant, a pigment dispersant, an antifoaming agent, a leveling agent, a preservative, an optical brightener, a viscosity stabilizer, a pH adjuster, and a hardener. Various additives can be added.

One form of the ink receiving layer of the present invention is a so-called cast treatment in which the ink receiving layer is pressed against a heated mirror roll and dried to finish while the ink receiving layer is in a wet state.

As a method of casting the ink receiving layer, there are a direct method, a gelling method and a rewetting method. Among them, the direct method is to apply a high gloss finish by pressing the coating layer onto a heated mirror drum while the coating layer applied on the support is still wet. In the gelation method, while the coating layer applied on the support is still in a wet state, the coating layer is brought into contact with a gelling agent bath, and the coating layer in the wet gel state is heated to a mirror surface of a heated mirror drum. To perform a high gloss finish. Furthermore, in the rewetting method, after a wet state coating layer is once dried, this coating layer is brought into contact with a rewetting liquid, and the wet state coating layer is pressed against a heated mirror-surface drum to give a high gloss finish. Is performed.

When the method of cast coated paper is adopted,
When any of the above three methods is selected, the moisture of the coating layer evaporates from the back surface of the support. Therefore, it is necessary to select a paper support having moisture permeability as the support.

The cast receiving ink receiving layer is
Conventionally known configurations of various ink receiving layers can be used. That is, one configuration is an ink receiving layer mainly containing a porous pigment and an aqueous adhesive.

Examples of the porous pigment of the present structure include porous synthetic amorphous silica, porous calcium carbonate, porous magnesium carbonate, and porous alumina (pseudo-boehmite, δ-alumina). High porous synthetic amorphous silica is preferred. Such a synthetic amorphous silica is a microporous, irregular fine particle having a three-dimensional structure of SiO2 formed by gelation of silicic acid, and has a pore diameter of 10%.
About 2000 Å.

As such synthetic amorphous silica, commercially available ones can be suitably used. For example, Mizukasil P-
526, Mizukacil P-801, Mizukasil NP-8,
Mizukacil P-802, Mizukasil P-802Y, Mizukasil C-212, Mizukacil P-73, Mizukacil P
-78A, Mizukacil P-78F, Mizukacil P-8
7, Mizukacil P-705, Mizukasil P-707, Mizukasil P-707D, Mizukasil P-709, Mizukasil C-402, Mizukasil C-484 (all manufactured by Mizusawa Chemical), Toksil U, Toksil UR, Toksil G
U, Toksil AL-1, Toksil GU-N, Toksil N, Toksil NR, Toksil PR, Solex, Fine Seal E-50, Fine Seal T-3
2, Fine Seal X-37, Fine Seal X-7
0, Fine Seal RX-70 Fine Seal A, Fine Seal B (all manufactured by Tokuyama), Carplex F
PS-101, carplex CS-7, carplex 80, carplex XR, carplex 67 (all manufactured by Shionogi & Co., Ltd.), thyroid 63, thyroid 6
5, thyroid 66, thyroid 77, thyroid 7
4, thyroid 79, thyroid 404, thyroid 6
20, thyroid 800, thyroid 150, thyroid 244, and thyroid 266 (all manufactured by Fuji Silysia Chemical Ltd.).

Examples of the water-based adhesive of the present invention include starch derivatives such as starch, oxidized starch, cationized starch, etherified starch, and phosphate esterified starch, carboxymethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, and cellulose sulfate. Cellulose derivatives, polyvinyl alcohol of various degrees of saponification or silanol modified products thereof, carboxylated products, various derivatives such as cationized products, casein, gelatin, modified gelatin, natural polymers such as soy protein, polyvinylpyrrolidone, sodium polyacrylate, styrene- Water-soluble synthetic polymers such as maleic anhydride copolymer sodium salt and polystyrene sodium sulfonate are used. Styrene-
Butadiene copolymer, conjugated diene copolymer latex such as methyl methacrylate-butadiene copolymer, acrylic polymer latex such as polymer or copolymer of acrylate and methacrylate, ethylene-
Vinyl-based polymer latex such as vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, or functional group-modified polymer latex with functional group-containing monomer such as carboxy group of these polymers, polyurethane resin Thermosetting synthetic resins such as latex, melamine resin, and urea resin can be used.

The amount of the aqueous adhesive to be added to the porous inorganic pigment is 3 parts by weight based on 100 parts by weight of the total solid content of the pigment.
To 70 parts by weight, preferably 5 to 50 parts by weight,
If the amount is less than the weight part, the coating strength of the ink receiving layer is insufficient,
If the amount exceeds 70 parts by weight, the ink absorbency decreases.

Further, in the ink absorbing layer, as an additive,
Dye fixing agents (various cationic resins), pigment dispersants, thickeners, flow improvers, defoamers, defoamers, release agents, sizing agents, penetrants, coloring dyes, coloring pigments, fluorescent whitening Agents, ultraviolet absorbers, antioxidants, preservatives, anti-binders, wet strength enhancers, dry strength enhancers, and the like can also be appropriately compounded.

In particular, secondary amines which form salts insoluble with sulfonic acid groups, carboxyl groups, amino groups and the like in water-soluble direct dyes and water-soluble acid dyes which are dye components of aqueous inks,
When a cationic dye fixing agent comprising a quaternary amine and a quaternary ammonium salt is blended, the dye is captured in the ink receiving layer, so that the color is improved. Further, the formation of an insoluble salt is preferable because the destruction of the recorded image due to the dye or pigment in the ink flowing out of the ink receiving layer due to water dripping or moisture absorption is suppressed.

In the present configuration, if the coating amount of the ink receiving layer is too small, not only will there be a problem in the ink absorbency, but also the image density, color and sharpness will be low, The dot shape is deteriorated, called feathering, which is diffused and jagged like a bird. Further, if the coating amount is too large, the drying load in the drying step after coating increases, and not only does the productivity decrease due to a decrease in the coating speed, but also the coating composition constituting the ink receiving layer in drying under a high load. The adhesive inside moves to the surface of the ink receiving layer together with the solvent that evaporates, and reduces the amount of voids on the surface. From such a viewpoint, the coating amount of the ink receiving layer is preferably from 1 to 30 g / m ² . In addition, the ink receiving layer can be applied in a certain application amount by dividing the application amount into several times. In order to impart gloss, the gloss is improved as compared with the case where the application amount is applied all at once.

The method for applying the ink-receiving layer is as follows. Various apparatuses such as a blade coater, a roll coater, an air knife coater, a bar coater, a rod blade coater, a curtain coater, a short dwell coater, and a size press are used on-machine or off-machine. Can be used. Coating with a curtain coater which can provide a coating layer having a uniform thickness without coating unevenness is particularly preferable. or,
After the application, it is possible to use a calender such as a machine calender, a TG calender, a super calender, and a soft calender to flatten and impart gloss.

When the ink receiving layer is applied, the ink receiving layer may be directly provided on the support, or may be subjected to a known surface activation treatment such as a corona treatment, a flame treatment, a plasma treatment, or an ultraviolet irradiation treatment. It can be applied later.

Another structure of the ink-receiving layer used in the present invention is that a gloss-developing layer composed of a coating composition containing a pigment and an adhesive as a main component is applied on the ink-receiving layer. This is a method of performing a casting process while in a wet state. In order to obtain a glossy layer in a wet state,
There are a method in which the gloss-generating layer is cast immediately after coating, and a method in which the gloss-generating layer is once dried and then brought into a wet state by bringing the coating layer into contact with a rewetting liquid.

As the pigment contained in the glossy layer, one or more known pigments can be used in order to improve the ink absorption and the color reproducibility of the ink. For example, light calcium carbonate, heavy calcium carbonate, magnesium carbonate, magnesium hydroxide, 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, alumina, colloidal alumina, pseudoboehmite, aluminum hydroxide, lithopone, zeolite, hydrohaloysite, inorganic pigments such as magnesium hydroxide, styrene-based plastic pigments, Organic pigments such as acrylic plastic pigments, polyethylene, microcapsules, urea resins, melamine resins, and the like. Among them, colloid particles having an average particle diameter of 300 nm or less are preferable.

The colloid particles preferably applied to the glossy layer of the present invention preferably have a porous structure of amorphous silica or alumina having an average particle diameter of 300 nm or less. The colloid particles are supplied in a suspended and dispersed form, and have a porous structure having a structure of secondary particles or more in which amorphous silica or alumina having a primary particle diameter of several nm or less, preferably 1 nm or less forms a network. is there. In the case of forming a glossy layer in combination with another pigment, 5 parts by weight, preferably 10 parts by weight or more of the colloid particles is used based on 100 parts by weight of the total pigment in the glossy layer. .

Further, in the colloid particles applied to the glossy layer of the present invention, cationic colloid particles are more preferable, and the cationic colloid particles are suspended and dispersed in water to form a colloid. The average particle diameter in the colloidal state measured by the dynamic light scattering method is 30.
0 nm or less, the particle surface refers to positively charged particles, for example, boehmite, alumina sol such as pseudo-boehmite or colloidal alumina, or the colloidal silica particle surface as disclosed in JP-B-47-26959 And the like coated with alumina. If the average particle diameter exceeds 300 nm, the surface area of the colloidal particles decreases, so that the fixability of the ink decreases, and it becomes necessary to increase the coating amount of the glossy layer.

That is, since the charge on the particle surface is a cation, it becomes possible to fix the dye component in the ink on the glossy layer by electric interaction. Furthermore, since the colloid particles themselves do not have the capacity to absorb the solvent component, the solvent component penetrates the glossy layer,
It will penetrate the ink receiving layer. If the permeation of the solvent component in the ink receiving layer is slow, the ink will stay in the glossy layer and the ink will be diffused, so that the permeation of the solvent component must be fast.

Examples of the adhesive contained in the glossy layer include natural polymers such as casein, gelatin and soybean protein, starch derivatives such as etherified starch and phosphorylated ester, carboxycellulose and hydroxyethylcellulose. Natural derivatives such as cellulose derivatives such as cellulose derivatives thereof, and various derivatives such as polyvinyl alcohol or silanol modified products thereof, carboxyl modified products, cation modified products thereof having various degrees of saponification, polyethylene oxide, polyethylene glycol, polyacrylamide, polyvinyl pyrrolidone, etc. Water-soluble polymer, melamine resin, urea resin,
Various water-soluble synthetic polymers such as polyurea polyamide resins and derivatives thereof such as carboxyl-modified, amide-modified, and cation-modified, and styrene-butadiene-based, acrylate and methacrylate-based, ethylene-vinyl acetate-based, Examples include synthetic polymer emulsions such as polyurethanes, latexes and modified derivatives such as carboxyls, amides, and cations modified with various amine groups.

The mixing ratio of the adhesive in the glossy layer is as follows:
It is usually 5 to 70 parts by weight, preferably 5 to 50 parts by weight, based on 100 parts by weight of the pigment. If the mixing ratio of the adhesive to 100 parts by weight of the pigment is less than 5 parts by weight, the strength of the glossy layer may be insufficient. On the other hand, if the above mixing ratio is more than 70 parts by weight, the ink absorbency may be reduced and good image quality may not be obtained.

For the application of the glossy layer, for example, various blade coaters, roll coaters, bar coaters, rod blade coaters, curtain coaters, short dwell coaters,
Various devices such as a size press can be used.

The amount of the glossy layer to be applied is different depending on the smoothness and size of the ink receiving layer, required smoothness, and the like, and thus it is difficult to determine it in a straightforward manner.
m ² or more is sufficient. After the casting of the glossy layer, humidified air or humidified steam may be blown on the back surface to perform curl correction.
Calendar processing using a calendar, a super calendar, a soft calendar, or the like may be performed.

[0081]

EXAMPLES The present invention will be described below with reference to examples, but is of course not limited thereto.

<Preparation of Base Paper A> Base paper was prepared as follows. For 100 parts of wood pulp consisting of 90 parts of LBKP (freeness 400 mlcfs) and 10 parts of NBKP (freeness 450 mlcfs), 5 parts of light calcium carbonate,
After preparing 0.1 part of a commercially available alkyl ketene dimer, 0.05 part of a commercially available cationic polyacrylamide, and 1.0 part of a commercially available cationized starch, the basis weight was 125% using a fourdrinier paper machine.
After papermaking to g / m ² , oxidized starch (MS3800: manufactured by Japan Food Processing Co., Ltd.) was adhered using an on-machine incline size press to obtain base paper A having a basis weight of 127 g / m ² .

<Preparation of base paper B> Hardwood bleached kraft pulp (LBKP) and softwood bleached sulphite pulp (NBS)
A 1: 1 mixture of P) was beaten to 300 ml with Canadian Standard Freeness to prepare a pulp slurry. As a sizing agent, alkyl ketene dimer to pulp is 0.5% by weight, polyacrylamide is 1.0% by weight to pulp, cationized starch is 2.0% by weight to pulp, and polyamide epichlorohydrin resin is a sizing agent. Add 0.5% by weight to pulp and dilute with water to 1%
A slurry was obtained. This slurry is sent to a Fourdrinier paper machine to obtain a basis weight of 17
The paper was made so as to be 0 g / m ² to obtain a base paper B for a polyolefin resin-coated paper.

<Preparation of Support A> A density of 0.918 g / cm ³ was applied to the surface of base paper B (the side on which the ink receiving layer is provided).
5% to 100% by weight of low-density polyethylene resin
A polyethylene resin composition in which anatase-type titanium (wt%) is uniformly dispersed is melted at 320 ° C., extruded at 200 m / min to a thickness of 30 μm, and glossed using a cooling roll that has been subjected to fine surface roughening. 60% resin coating. The other surface has a density of 0.962 g / cm.
The high-density polyethylene resin of No. ³ was melted at 320 ° C., extrusion-coated to a thickness of 30 μm, and coated with a back surface resin having a gloss of 5% using a rough cooling roll.
Then, the resin-coated paper was applied to a silk-patterned embossing machine, and the surface was subjected to a silk-pattern patterning to prepare a support A.

<Preparation of Support B> Surface of base paper B (ink
On the side on which the receiving layer is provided), a density of 0.918 g / cm^Three
5% to 100% by weight of low-density polyethylene resin
Polyethylene in which weight% anatase type titanium is uniformly dispersed
Melting the ren resin composition at 320 ° C and thickening at 200m / min
Extrusion coating to a thickness of 30μm, silk pattern
Was coated with a resin using a cooling roll engraved with.
The other surface has a density of 0.962 g / cm. ^ThreeHigh density
Melt the ethylene resin at 320 ° C to a thickness of 30 μm.
Extrusion coating and rough cooling roll
Backing resin coating with glossiness of 5% to produce support B
did.

<Preparation of Support C> Synthetic paper (Yupo FPG # 200, manufactured by Oji Yuka Synthetic Paper) produced by blending an inorganic filler with a polypropylene resin and forming it by a biaxially stretched film molding method is used as it is. This was used as a support C.

<Preparation of Support D> Synthetic paper (Yupo FPG # 200, manufactured by Oji Oil Chemical Synthetic Paper) produced by blending an inorganic filler with a polypropylene resin and forming the film by a biaxially stretched film forming method was used. The pattern was embossed with a pattern, and the surface (the side on which the ink receiving layer was provided) was formed with a silk pattern to prepare a support D.

<Synthesis of Alumina Hydrate> Ion-exchanged water 1
200 g and isopropyl alcohol 900 g were charged into a 3 L reactor and heated to 75 ° C. 408 g of aluminum isopropoxide were added, and 75 g for 24 hours, followed by 9 g
Hydrolysis was performed at 5 ° C. for 10 hours. After hydrolysis, acetic acid 2
4 g was added and the mixture was stirred at 95 ° C. for 48 hours. Next, the mixture was concentrated so that the solid content concentration became 15% by weight to obtain a white alumina hydrate dispersion. The sol was dried at room temperature and measured for X-ray diffraction, which showed a pseudo-boehmite structure. When the average particle size was measured with a transmission electron microscope,
It was 0 nm, and it was a plate-like alumina hydrate having an aspect ratio of 6.0. When the average pore radius, pore volume and BET specific surface area were measured by the nitrogen adsorption / desorption method, 7.1 nm, 0.65 ml / g and 2
00 m ² / g.

<Ink Receiving Layer Coating Liquid A> 10% by weight of polyvinyl alcohol (manufactured by Kuraray Co., Ltd.) was used for 100 parts of the alumina hydrate dispersion using the above-mentioned 15% by weight dispersion of alumina hydrate. PVA235) 15 parts of an aqueous solution were mixed. After mixing, the mixture was uniformly dispersed in a homomixer at 10,000 rpm for 10 minutes. The dispersion was concentrated by an evaporator to a predetermined concentration to obtain a coating liquid A.

<Ink-receiving layer coating liquid B> As alumina fine particles, 600 g of aerosil aluminum oxide C (manufactured by Nippon Aerosil Co., Ltd.) having a primary particle diameter of 13 nm, which is a γ-type alumina crystal powder of the δ group, was placed in 2400 g of ion-exchanged water. The mixture was dispersed by a stirrer to prepare a 20% by weight slurry viscous liquid. Using this 20 wt% γ-type alumina dispersion, 10 wt% was added to 100 parts of the alumina dispersion.
30 parts of an aqueous solution of polyvinyl alcohol (PVA235 manufactured by Kuraray Co., Ltd.) was mixed. After mixing, 10,000 r into a homomixer
The mixture was uniformly dispersed at pm for 10 minutes. The dispersion was concentrated by an evaporator so as to have a predetermined concentration to obtain a coating liquid B.

<Ink Receiving Layer Coating Liquid C> The coating composition for the ink receiving layer is 100% silica (AEROSIL300: manufactured by Nippon Aerosil Co.) having a primary particle diameter of 7 nm.
g in 500 g of ion-exchanged water with a stirrer,
10% by weight of polyvinyl alcohol (Kuraray PVA)
235) A coating solution C was prepared by mixing 80 g of the aqueous solution.

<Ink receiving layer coating liquid D> The coating composition of the ink receiving layer is a synthetic amorphous silica (fine seal X-
37B, average particle diameter 3.5 μm: manufactured by Tokuyama Corporation) 100
Part, polyvinyl alcohol (PVA117: manufactured by Kuraray Co., Ltd.) 30 parts, colloidal silica (Snowtex-O:
Using 30 parts of Nissan Chemical Industries, Ltd. and 20 parts of a cationic dye fixing agent (Sumirez Resin 1001: Sumitomo Chemical Co., Ltd.)
The coating liquid D was prepared at a solid content of 15%.

<Ink receiving layer coating liquid E> The coating composition for the ink receiving layer was a synthetic amorphous silica (Mizukasil P-78).
F, average particle diameter 12 μm: 80 parts, manufactured by Mizusawa Chemical Industry Co., Ltd.)
20 parts of synthetic amorphous silica (Fine Seal X-37B, average particle size 3.5 μm: manufactured by Tokuyama Corporation), 30 parts of polyvinyl alcohol (PVA117: manufactured by Kuraray), colloidal silica (Snowtex-O: Nissan Chemical Industries, Ltd.) Made)
30 parts, cationic dye fixing agent (Violet Resin 100
(1: Sumitomo Chemical Co., Ltd.), and the coating liquid E was prepared at a solid content of 15%.

<Ink receiving layer coating liquid F> The coating composition of the ink receiving layer has an average particle diameter of 65 as colloidal particles.
100 parts of colloidal silica (Snowtex YL: manufactured by Nissan Chemical Industries, Ltd.) and styrene-butadiene-based latex (0693; average particle diameter 135 n) as an adhesive
m: manufactured by Nippon Synthetic Rubber Co., Ltd.) 30 parts, and 2 parts of commercially available potassium oleate as a release agent were used to obtain a coating liquid F having a solid content concentration of 25%.

[0095] Example 1, Comparative Examples 1 and 2 base paper A, by an air knife coater with an ink receiving layer coating solution D, was coated on one side of the coated base paper to give a dry coating weight 10 g / m ^2, 2 After a lapse of seconds, the film was cast by a direct method in which it was pressed against a mirror-surface roll heated to a surface temperature of 90 ° C. and dried. The thickness was 171 μm. Width 10
The recording medium of Example 1 was cut into a shape of 0 mm and a length of 600 mm. The recording medium of Comparative Example 1 was cut into A4 (210 mm × 297 mm), and the recording medium of Comparative Example 2 was cut into a width of 100 mm and a length of 8 m and wound around a roll.

Example 2, Comparative Examples 3 and 4 An ink receiving layer coating solution E was applied to base paper A by an air knife coater on one side of the base paper so as to have a dry coating amount of 8 g / m ^2, and dried. Next, the ink-receiving layer coating liquid F was applied thereon by an air knife coater to a dry coating amount of 4 g / m ^2.
And dried. Water was applied to the coated surface, the coated surface was re-wetted, and a cast treatment was performed by a rewetting method in which the coated surface was pressed against a mirror surface roll heated to 90 ° C. and dried. It was cut into a width of 148 mm and a length of 600 mm to obtain a recording medium of Example 2. A4 (210m
mx 297 mm) in Comparative Example 3, width 148 m
The recording medium of Comparative Example 4 was cut to a length of 8 m and wound on a roll.

Example 3, Comparative Examples 5 and 6 On the support A, an ink receiving layer coating solution A was applied by a curtain coater onto one surface of the support A so as to have a dry coating amount of 30 g / m ^2.・ Dry, 89mm wide, 550m long
The recording medium of Example 3 was cut into m. Also, A4 (2
Comparative Example 5, width 8
A recording medium of Comparative Example 6 was cut to 9 mm and 8 m in length and wound around a roll.

Example 4, Comparative Examples 7 and 8 In Example 3, Comparative Examples 5 and 6, the support A was replaced with the support B
The recording media of Example 4, Comparative Examples 7 and 8 were produced in exactly the same manner as in Example 3 and Comparative Examples 5 and 6, except that the recording medium was replaced.

Example 5, Comparative Examples 9 and 10 In Example 3, Comparative Examples 5 and 6, the support A was replaced with the support C
The recording media of Example 5, Comparative Examples 9 and 10 were produced in exactly the same manner as Example 3 and Comparative Examples 5 and 6, except that the recording medium of Example 5 was changed.

Example 6, Comparative Examples 11 and 12 In Example 3, Comparative Examples 5 and 6, the support A was replaced with the support D
The recording media of Example 6, Comparative Examples 11 and 12 were produced in exactly the same manner as Example 3 and Comparative Examples 5 and 6 except that the recording medium was replaced.

Example 7, Comparative Examples 13 and 14 On the support A, a coating liquid B for the ink receiving layer was applied by a curtain coater onto one surface of the support A so as to have a dry coating amount of 30 g / m ^2.・ Dry, width 100mm, length 600
The recording medium of Example 7 was cut into mm. Also, A4
(210 mm × 297 mm) was cut into Comparative Example 1
3. The recording medium of Comparative Example 14 was cut into a width of 100 mm and a length of 8 m, and wound around a roll.

Example 8, Comparative Examples 15 and 16 In Example 7, Comparative Examples 13 and 14, except that the support A was replaced with the support B, the procedure was the same as in Example 7, Comparative Examples 13 and 14. The recording media of Example 8, Comparative Examples 15 and 16 were produced.

Example 9, Comparative Examples 17 and 18 In Example 7, Comparative Examples 13 and 14, except that the support A was replaced with the support C, the same as Example 7, Comparative Examples 13 and 14 was carried out. The recording media of Example 9, Comparative Examples 17 and 18 were produced.

Example 10, Comparative Examples 19 and 20 In Example 7, Comparative Examples 13 and 14, except that the support A was replaced with the support D, the procedure was the same as in Example 7, Comparative Examples 13 and 14. The recording media of Example 10 and Comparative Examples 19 and 20 were produced.

Example 11, Comparative Examples 21 and 22 On the support A, a coating liquid C for the ink receiving layer was applied by a curtain coater onto one surface of the support A so as to have a dry coating amount of 30 g / m ^2.・ Dry, 89mm wide, 550m long
The recording medium of Example 11 was cut into m. Also, A4
(210 mm x 297 mm) was cut into Comparative Example 2
1. A recording medium of Comparative Example 22 was cut into a width of 89 mm and a length of 8 m, and wound around a roll.

Example 12, Comparative Examples 23 and 24 In Example 11, Comparative Examples 21 and 22, except that the support A was replaced with the support B, the procedure was the same as in Example 11, Comparative Examples 21 and 22. The recording media of Example 12, Comparative Examples 23 and 24 were produced.

Example 13 and Comparative Examples 25 and 26 In Example 11, Comparative Examples 21 and 22, except that the support A was replaced with the support C, the procedure was the same as in Example 11, Comparative Examples 21 and 22. The recording media of Example 13 and Comparative Examples 25 and 26 were produced.

Example 14, Comparative Examples 27 and 28 In Example 11, Comparative Examples 21 and 22, except that the support A was changed to the support D, the procedure was the same as in Example 11, Comparative Examples 21 and 22. The recording media of Example 14, and Comparative Examples 27 and 28 were produced.

Example 15 and Comparative Example 29 The procedure of Example 11 was repeated, except that the cut shape was cut to a width of 182 mm and a length of 515 mm.
The recording medium of Example 15 was used. A recording medium of Comparative Example 29 was cut into a width of 182 mm and a length of 8 m, and wound around a roll.

<Print> An EPSON is stored in the recording medium.
A photographic image photographed by a digital camera was printed by an inkjet printer PM800C manufactured by Toshiba Corporation. For Examples 1, 7 to 10 and Comparative Examples 1, 2, 13 to 20,
4 continuous images of width 100 mm x length 148 mm
Printed. For Example 2, Comparative Examples 3 and 4,
Continuous 148 mm wide x 100 mm long images 6
Printed. In Examples 3 to 6, 11 to 14, and Comparative Examples 5 to 12 and 21 to 28, four continuous images of 89 mm wide by 126 mm long were printed.
In Example 15 and Comparative Example 29, the width was 172 m.
Two continuous images of mx 247 mm in length were printed.

The result is that the width is 1 and the length is 2.5 or more.
In Examples 1 to 15, which were cut to 0 or less, clear images were printed, there was no waste of margins generated on the A4 size recording medium, and there was no meandering or curl generated by the rolls, and good prints were obtained. was gotten. Comparative Examples 1, 3, 5, 7, 9, 11, 13, 15, 17, 19,
21, 23, 25, and 27 had a large amount of blank space. Also, Comparative Examples 2, 4, 6, 8, 10, 12, 1
4, 16, 18, 20, 22, 24, 26, 28, 29
Used a roll type recording medium mounting jig,
Curl curl and feeding meandering occurred. However, Comparative Example 29 had less meandering than Comparative Example 22, and the curl was relatively gentle. Therefore, Example 11, Comparative Example 22, and Example 15
Width is narrower (148 mm or less) as compared with Comparative Example 29
It can be seen that the effect of cutting in a strip shape is greater.

[0112]

As described above, by making the shape of the recording medium into a cut sheet shape having a width of 1 and a length of 2.5 or more and 7.0 or less, it is likely that the recording medium is usually sold. In addition, it is possible to eliminate the waste of blank space generated in the A4 size plate, eliminate the need for a mounting jig required for a roll, and to avoid meandering and curling of a recording medium generated by a roll.
In particular, when the recording medium is a high-quality, high-resolution compatible medium suitable for photographic printing, the shape of the present invention is
There is also an effect that the user is easily available and easy to use. When the width is 148 mm or less, the effect is extremely large.

Claims (16)

[Claims] 1. A recording medium comprising an ink receiving layer containing an inorganic pigment and an adhesive provided on a support, wherein the recording medium has a width of 1 and a vertical length of 2.5. 7.0
A cut sheet ink jet recording medium characterized by the following. 2. The cut sheet ink jet recording medium according to claim 1, wherein the recording medium has a width of 182 mm or less. 3. The cut sheet ink jet recording medium according to claim 1, wherein the recording medium has a width of 148 mm or less. 4. The ink receiving layer according to claim 1, wherein the ink receiving layer is provided with high gloss by a casting method.
4. The cut sheet ink jet recording medium according to any one of claims 1 to 3. 5. The method according to claim 1, wherein said inorganic pigment is ultrafine silica synthesized by a gas phase method.
The cut sheet-shaped inkjet recording medium according to any one of the above. 6. The cut sheet ink jet recording medium according to claim 1, wherein the inorganic pigment is alumina hydrate. 7. The ink jet recording medium according to claim 6, wherein said alumina hydrate has a pseudo-boehmite structure. 8. The method according to claim 1, wherein the support is a resin-coated paper having a thermoplastic resin coating layer provided on paper. Cut sheet ink jet recording medium. 9. The cut sheet type ink jet recording medium according to claim 8, wherein the thermoplastic resin is a polyolefin resin. 10. The cut sheet ink jet recording medium according to claim 9, wherein said polyolefin resin is a polyethylene resin or a polypropylene resin. 11. The cut sheet ink jet recording medium according to claim 8, wherein the coating layer of the thermoplastic resin contains a pigment. 12. The cut sheet type ink jet recording medium according to claim 1, wherein the support is a white film. 13. The cut sheet ink jet recording medium according to claim 1, wherein said support is synthetic paper. 14. The cut sheet type ink jet recording medium according to claim 1, wherein the thickness of the support is 150 μm or more. 15. The cut sheet type ink jet recording medium according to claim 1, wherein the surface of the support on which the ink receiving layer is provided is subjected to molding. 16. The thermoplastic resin coating layer is formed by being pressed into contact with a cooling roller having a desired shape during melt extrusion coating of the thermoplastic resin.
12. The cut sheet ink jet recording medium according to any one of claims 11 to 11.