JP2001105722A - Ink jet recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording medium not only recording a highly precise image with good reproducibility but also having sufficient surface strength as an office sheet and no paper chip generated when conveyed in a printer. SOLUTION: In the ink jet recording medium comprising an ink receiving layer containing a noncrystalline silica having a mean particle size of 2 to 10 μm and an adhesive on a support, the layer contains polymer fine particles having a mean particle size of 3 to 40 μm.

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 on a recording medium by using an aqueous ink, and in particular, has excellent ink absorbency and image reproducibility, and has sufficient surface strength as office paper. The present invention relates to an ink jet recording medium that generates less paper dust when conveyed by a printer.

[0002]

2. Description of the Related Art An ink jet recording system using an aqueous ink has a low noise at the time of recording, is easy to colorize, and is capable of high-speed recording. Applications to form printing and the like are being promoted. Because high-quality paper and coated paper used for general printing have poor ink absorption,
The printed ink remains on the paper surface without drying for a long time, and contaminates the apparatus and the continuously printed sheet or stains the image. In order to solve such a problem, a recording paper having a low size is used (Japanese Patent Laid-Open No.
No. 53012), and a base paper containing a urea-formalin resin impregnated with a water-soluble polymer (Japanese Unexamined Patent Publication No.
No. 49113). Further, recording papers coated with various porous inorganic pigments such as amorphous silica on the surface thereof for the purpose of enhancing the color developability and reproducibility of the ink (JP-A-55-51583, JP-A-56-51583) 148585). Also,
The physical properties of these porous pigments are specified for the purpose of obtaining a high-definition image with reduced bleeding (JP-A-58-110287, JP-A-59-185690, JP-A-61-161).
41584) has been proposed.

[0003] However, the recording medium proposed in the above-mentioned proposals has clearness, reproducibility and ink absorbability of an image, but has poor surface strength. For this reason, there is a problem in that the paper dust accumulates on parts such as a paper feed roll due to the conveyance of the recording medium inside the printer, causing a paper feed failure and recording stains. That is, when the recording paper and the recording paper are conveyed, they are rubbed, the pigments fall off, and accumulate on conveyance rolls and the like,
Misfeed due to roll idling and deterioration of image quality due to adhesion of paper powder to the printing surface occur.

[0004] As an example of using an organic pigment, a coating sheet for ink jet recording of a coating layer containing an oil-absorbing inorganic pigment, an organic pigment and an aqueous adhesive (JP-A-64-24785) is disclosed. However, it had only oil-based inkjet recording suitability but not aqueous inkjet recording suitability. A recording medium (Japanese Patent Application Laid-Open No. 57-82085) has been disclosed in which polystyrene particles are added to quickly absorb ink, suppress diffusion of the ink in the horizontal direction, and increase the resolution. And had the disadvantage of producing paper dust.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks, and not only can record a high-definition image with good reproducibility, but also has sufficient surface strength as office paper and can be used in a printer. Provided is a recording medium for ink jet which does not generate paper dust during transportation.

[0006]

The present invention includes the following aspects. [1] In an ink jet recording medium comprising an ink receiving layer containing amorphous silica having an average particle diameter of 2 to 10 μm and an adhesive on a support, the ink receiving layer further has an average particle diameter of 3 to 40 μm. An ink jet recording medium comprising: polymer fine particles of the above. [2] The ink jet recording medium according to [1], wherein the ink receiving layer further contains a cationic resin. [3] Polymer fine particles are polyethylene fine particles [1]
Or the inkjet recording medium according to [2]. [4] The ink jet recording medium according to [1] or [2], wherein the polymer particles are spherical urethane particles.

[5] The average particle diameter of the polymer fine particles is 5
The inkjet recording medium according to [1], which has a thickness of from 20 to 20 μm.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

As a method for producing amorphous silica, there are a wet method and a dry method. Silica by the wet method is produced using silicon dioxide (SiO ₂ ), which is present in large amounts on the earth, mainly silica sand as a raw material. The physical properties of amorphous silica can be controlled by the production method, and it is possible to produce amorphous silica with properties according to the intended use, such as for adsorption separation, for catalyst carriers, and for filling paints and resins. It is. As a method for producing amorphous silica by a wet method, there are a gel method and a sedimentation method.

The amorphous silica produced by the gel method is prepared by mixing sodium silicate and sulfuric acid made of high-purity silica sand as raw materials to form a silica sol. Silicic acid sol gradually polymerizes, forms primary particles, forms three-dimensional aggregates, and gels. Amorphous silica having different physical properties such as specific surface area and pore diameter can be produced by changing the conditions for producing primary particles in this process. This silica aggregate is micronized and pulverized.

The amorphous silica of the sedimentation method sediments when the growth of the secondary aggregates is stopped under the above reaction conditions of the gel method silica due to the influence of temperature, coexisting ions, surfactants, etc. (Secondary particle diameter of about 0.1 μm or less). Incidentally, the amorphous silica of the dry method is SiCl ₄
Is produced by combustion hydrolysis in the gas phase, so it is also called a dry method as opposed to a wet method. This method results in a compact silica with no gaps inside the particles and therefore no internal surface area.

The difference in the production method of the amorphous silica is that the amorphous silica produced by the gel method has small primary particles, the cohesive force of the amorphous silica is large, and relatively dense secondary particles are easily produced. . Since the pore volume is small in order to produce relatively dense secondary particles, the ink receptivity may be inferior to amorphous silica produced by a precipitation method in some cases. On the other hand, amorphous silica produced by the sedimentation method has large primary particles, the cohesive force of the silica is small, and relatively loose secondary particles are easily produced. The pore volume is a void formed by agglomeration of primary particles and has a controllable property. Amorphous silica produced by the gel method generally forms stronger aggregates with each other than amorphous silica produced by the sedimentation method. These strong agglomerates are expected to contribute to the improvement of the strength of the coating film, and improve the pencil writability which is an important factor as suitability for office paper.

Although the precipitated silica generally has an effect of improving the image quality, the surface strength is weak and paper powder is easily generated. Gel silica has high surface strength and hardly generates paper powder, but may have a poor dot shape. By using both of them, quality design can be performed so as to be compatible with various printers.

With respect to the ink jet recording system for performing recording on a medium using an aqueous ink, in an ink jet recording medium comprising an ink receiving layer containing amorphous silica and an adhesive on a support, the ink receiving layer may be used. If the average amount of the amorphous silica particles is less than 2 μm, the recording properties of the ink jet recording medium may be high, but the surface strength may be poor. Also, if the amorphous silica in the ink receiving layer contains a large amount of amorphous silica having an average particle diameter of more than 10 μm, the suitability for recording as an inkjet recording medium may be slightly deteriorated in some cases. Therefore, the average secondary particle diameter of the amorphous silica is preferably 2 to 10 μm.

[0015] Other pigments can be used in combination. For example, among inorganic pigments such as aluminum silicate, calcium silicate, magnesium silicate, amorphous silica other than the above, colloidal silica, alumina, aluminum hydroxide, and magnesium hydroxide, those preferably having an aggregate secondary particle structure. In particular, aluminum hydroxide, magnesium hydroxide, and amorphous silica other than those described above can be preferably used because many varieties are industrially marketed and those having desired performance can be easily selected. .

In order to improve the water resistance of images printed with aqueous inks, polyethyleneimine resins, polyamine resins, polyamide resins, polyamide epichlorohydrin resins, polyamine epichlorohydrin resins, polyamide polyamine epichlorohydrin resins, polydiallylamine resins Resins, cationic resins such as diallyldialkyl quaternary ammonium hydrochloride, dicyandiamide condensate,
Cationic polymer compounds such as urea resin and melamine resin acid colloid can be suitably used. The content of the cationic resin in the ink receiving layer is not particularly limited,
The amount is preferably 3 to 200 parts by weight based on 100 parts by weight of the total amorphous silica. When the content of the cationic resin is 3 parts by weight or less of the total amorphous silica, image reproducibility may be deteriorated. The content of the cationic resin is 2
When the amount is more than 00 parts by weight, there is a possibility that the print drying property is inferior.

The present invention relates to an ink jet recording medium for recording on a recording medium using a water-based ink. In particular, the present invention is excellent in ink absorbency and image reproducibility, has sufficient surface strength as office paper, and can be used in a printer. As a result of various studies on an ink jet recording medium which generates little paper dust during transportation, a best method for solving the problem by blending polymer fine particles having a specific particle diameter was found.

The polymer fine particles (organic polymer type fine particle material) include crosslinked acrylic resin, methacrylic resin, fluorine resin, vinylidene fluoride resin, benzoguanamine resin, silicone resin, epoxy resin, nylon 6, nylon 66, nylon 11, There are fine particles of nylon 12, polystyrene resin, cross-linked polystyrene resin, phenol resin, melamine resin, polyolefin resin, polyethylene resin, urethane resin, cellulose and the like. Particularly, polyethylene fine particles and spherical urethane fine particles are preferable.

However, for use in an ink jet recording medium, it is preferable to use polymer fine particles having excellent waterproofness for an aqueous ink jet system and excellent solvent resistance for an oil ink jet system. The average particle size of the polymer fine particles is 3 to 40 μm, preferably 4 to 30 μm, and 5 to 20 μm.
Is more preferred. If the average particle size of the polymer fine particles is less than 3 μm, there is no effect of improving the friction resistance, and if it exceeds 40 μm, poor image reproducibility may occur. As the polymer fine particles, polyethylene fine particles or true spherical urethane fine particles are more preferable. The average particle diameter of the amorphous silica is preferably larger than the average particle diameter of the amorphous silica.
It is preferably about 1 to 10 times, more preferably 1.5 to 5 times.
It is about twice.

The spherical urethane fine particles are produced by using a method for producing microcapsules. As the encapsulation method, conventionally known coacervation methods, interfacial polymerization methods, in-situ (in situ) methods and the like can be appropriately selected and used. Can be manufactured.

In the present invention, spherical urethane fine particles are prepared using an aliphatic or aromatic polyvalent isocyanate compound.

Examples of the polyvalent isocyanate include m-phenylene diisocyanate, p-phenylene diisocyanate, 2,6-tolylene diisocyanate, 2,4-tolylene diisocyanate, naphthalene-1,4-diisocyanate and diphenylmethane-4,4'-. Diisocyanate, 3,3'-dimethoxy-4,4'-biphenyl diisocyanate, 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate, xylylene-1,4-
Diisocyanate, xylylene-1,3-diisocyanate, 4,4′-diphenylpropane diisocyanate, trimethylene diisocyanate, hexamethylene diisocyanate, propylene-1,2-diisocyanate, butylene-1,2-diisocyanate, ethylidene diisocyanate, cyclohexylene- 1,2-diisocyanate, cyclohexylene-1,4-diisocyanate, isophorone diisocyanate, p-phenylenediisothiocyanate, xylylene-1,4-diisothiocyanate, ethylidene diisothiocyanate, dimethylsilyl diisocyanate, vinylmethylsilyl isocyanate, 4-isocyanatomethyl-1,8-octamethylene diisocyanate, lysine diisocyanate,
Diisocyanates or diisothiocyanates such as bis (isocyanatomethyl) cyclohexane, dicyclohexylmethane diisocyanate, trimethylhexamethylene diisocyanate, 4,4 ′, 4 ″ -triphenylmethane triisocyanate, toluene-2,4,6-triisocyanate, tris ( Isocyanate phenyl)
Thiophosphate, methylsilyl triisocyanate,
Vinylsilyl triisocyanate, phenylsilyl triisocyanate, octadecylsilyl triisocyanate, methoxysilane triisocyanate, butoxysilane triisocyanate, octylsilane triisocyanate, 2,6-diisocyanatocaproic acid-β-isocyanateethyl ester, 2,6-diisocyanatecaprone Acid-γ-isocyanate propyl ester,
2,6-diisocyanatocaproic acid-2-methyl-β
Triisocyanates such as isocyanate esters, trimers of hexamethylene diisocyanate, polymethylene polyphenylisocyanate, 4,4′-dimethyldiphenylmethane-2,2 ′, 5,5′-tetraisocyanate, tetraisocyanatesilane, hexamethylene Examples include polyvalent isocyanates such as buret-type polyisocyanates containing residues derived from diisocyanate and isophorone diisocyanate. Urethane fine particles include those obtained by adding these polyvalent isocyanates to a compound having a hydrophilic group such as a polyvalent amine, a polyvalent carboxylic acid, a polyvalent thiol, a polyvalent hydroxy compound, or an epoxy compound.

In the present invention, the above aliphatic or aromatic polyvalent isocyanate compounds are used alone or in combination to prepare spherical urethane fine particles. The type and amount of the polyvalent isocyanate compound are appropriately adjusted according to the performance value of the target spherical urethane fine particles, and are not particularly limited.

The microcapsules made of polyvalent isocyanate may contain a hydrophobic liquid. As the hydrophobic liquid encapsulated in the microcapsules together with the polyvalent isocyanate, for example, a compound having one or more vinyl groups or vinylidene groups, preferably a plurality of compounds, specifically, an acryloyl group, a methacryloyl group, an allyl group,
There are unsaturated polyesters, compounds having a vinyloxyacrylamide group and the like. The type and amount of the hydrophobic liquid are appropriately adjusted according to the performance value of the target spherical urethane fine particles, and are not particularly limited.

It is preferable to add a radical polymerization initiator to the above-mentioned hydrophobic liquid. Examples of the radical polymerization initiator include azobisisobutyronitrile, azobis-2,4
-Azo polymerization initiators such as dimethylvaleronitrile, azobiscyclohexanecarbonitrile, methyl azobisisobutyrate, diisopropyl peroxydicarbonate,
2,4-dichlorobenzoyl peroxide, lauroyl peroxide, benzoyl peroxide, cyclohexanone peroxide, t-butyl perbenzoate, dicumyl peroxide, di-t-butyl peroxide, p-menthane hydroperoxide, pinane hydroperoxide, cumene hydroperoxide And a peroxide-based polymerization initiator such as t-butyl hydroperoxide.

Usually, in the interfacial polymerization method, in order to efficiently emulsify and disperse a hydrophobic liquid containing a polyvalent isocyanate in a hydrophilic liquid, an emulsion-stable emulsion used in water or a conventional capsule production system is used as the hydrophilic liquid. An aqueous solution of the agent is used. Such emulsion stabilizers include, for example, polyvinyl alcohol, anion-modified polyvinyl alcohol, cation-modified polyvinyl alcohol, gelatin,
Gum arabic, carboxymethylcellulose, polyacrylamide, hydroxyethylcellulose, methylcellulose, ethylcellulose, cellulose acetobutyrate, hydroxymethylcellulose, polyvinylpyrrolidone, montmorillonite, ligninsulfonic acid, polystyrenesulfonic acid and copolymers thereof, and hydrolysis of maleic anhydride copolymer Examples include decomposition products, polyacrylic acid and its copolymer, polymethacrylic acid and its copolymer, polyacrylamidomethylpropanesulfonic acid and its copolymer, and salts thereof. These emulsion stabilizers are used alone or as a mixture.

A polyamine may be added to the hydrophilic liquid depending on the desired quality of the spherical urethane fine particles. Such a polyvalent amine includes two or more NHs in the molecule.
Any substance having a group or an NH ₂ group and capable of being dissolved or dispersed in a hydrophilic liquid forming a continuous phase can be used. Specific substances include aliphatic polyamines such as diethylenetriamine, ethylenetriethylenetetramine, 1,3-propylenediamine, and hexamethylenediamine, epoxy compound adducts of aliphatic polyamines, and alicyclics such as piperazine. Formula polyvalent amine, 3,9-bis-
Heterocyclic diamines such as aminopropyl-2,4,8,10-tetraoxaspiro- (5,5) undecane can be mentioned.

At least one of these polyamines is added to the hydrophilic liquid. The amount of the polyamine is determined by the type and amount of the polyvalent isocyanate used and the desired performance value of the spherical urethane fine particles. Decided accordingly. Preferably 0.1 to 200 parts by weight, more preferably 1 to 100 parts by weight per 100 parts by weight of the polyvalent isocyanate.
It is adjusted in the range of parts by weight.

The spherical urethane fine particles obtained by the above-mentioned method are usually aqueous dispersions, which are filtered, then aerated, surface dried, fluidized, flash dried, spray-dried, vacuum-dried, It is used in a dry state after processing such as freeze drying, infrared drying, high frequency drying, ultrasonic drying, and fine pulverization drying.

The amount of the polymer particles to be added to the ink jet recording medium is usually 1 to 40 parts by weight, preferably 2 to 20 parts by weight, based on 100 parts by weight of the amorphous silica. .

In order to coat the ink receiving layer, in addition to the specific inorganic pigment of the present invention, if necessary, for example, calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc carbonate, Inorganic pigments such as satin white, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, amorphous silica, alumina, aluminum hydroxide, etc., styrene-based, acrylic-based, urea-based, melamine-based, and benzoguanamine-based organic pigments Can also be used in combination.

As a binder, starch and its derivatives, carboxymethylcellulose, hydroxyethylcellulose, casein, gelatin, natural or semi-synthetic polymers such as soybean protein, polyvinyl alcohol and its derivatives, polyvinyl butyral resin, polyethyleneimine resin , Polyvinylpyrrolidone resin, poly (meth)
Acrylic resin, acrylate resin, polyamide resin, polyacrylamide resin, polyester resin, urea resin, melamine resin, styrene / butadiene copolymer, methyl methacrylate / butadiene copolymer,
A known material such as an aqueous solution or aqueous dispersion of a vinyl copolymer resin such as an ethylene-vinyl acetate copolymer, or a modified polymer in which an anionic or cationic residue is introduced into the above resins is appropriately used. Can be.

Further, if necessary, a pigment dispersant, a thickener, an antifoaming agent, a foam inhibitor, a foaming agent, a release agent, a penetrant, a wetting agent, a thermal gelling agent, a lubricant, and other additives in the technical field. Various known auxiliaries can also be used.

The base material of the recording medium is not limited, but fillers such as talc, kaolin, calcined kaolin and calcium carbonate are added to the papermaking pulp as needed.
Base paper prepared by a method usually used for acidic or neutral papermaking can be appropriately used. In addition, a dry or wet nonwoven fabric, synthetic paper, film, or the like can be used as the substrate.

Although the coating amount in the ink receiving layer is not limited,
About 30 g / m ² . If the coating amount is small, the surface strength is increased, but the recording image quality may be poor. Conversely, if the coating amount is large, the image quality is good, but the surface strength may be weak.

The means for coating the ink receiving layer can be appropriately selected from commonly used coating means such as a size press, a gate roll, a roll coater, a bar coater, an air knife coater, a rod blade coater and a blade coater. it can.

The aqueous ink used in the present invention contains at least one of a water-soluble direct dye and a water-soluble acid dye as a dye. Contains fungicides and the like. Examples of the water-soluble direct dye include CI. Direct Black, CI. Direct Yellow, CI. Direct Blue, CI. Direct red and the like, and examples of the water-soluble acid dye include CI.
Acid Black, CI. Acid Yellow, CI. Acid Blue, CI. Acid Red and the like can be mentioned, but it is not necessarily limited to these.

[0038]

The present invention will be described in more detail with reference to the following examples, but it should be understood that the present invention is by no means restricted to these examples. In addition, the number of parts and% in an example show a weight part and weight%.

Example 1 100 parts of an amorphous silica pigment (trade name: Fine Seal X-45, manufactured by Tokuyama Corporation) having a specific surface area of 290 m ² / g and an average particle diameter of 4.3 μm produced by a sedimentation method, silanolated polyvinyl 250 parts of a 10% aqueous solution of alcohol (trade name: R-1130, manufactured by Kuraray Co., Ltd.), and a polydiallyldimethylammonium chloride-based cationic resin having a molecular weight of about 100,000 as a cationic resin (trade name: Unisense CP-10)
3, 10 parts of polyethylene fine particles having an average particle diameter of 15 μm (trade name: Flowbeads LE-1080, manufactured by Sumitomo Seika Co., Ltd.) were added as polymer fine particles,
After adding water, a coating liquid for an ink receiving layer having a concentration of 18% was obtained.
The weight of the paper is 80 g / m ² and the weight of dried paper is 10 g / m ^2.
After coating and drying using a bar, a super calender treatment was performed to obtain an ink jet recording medium.

Example 2 An ink jet recording medium was obtained in the same manner as in Example 1 except that the amount of coating after drying was 7 g / m ² .

Example 3 An ink jet recording medium was obtained in the same manner as in Example 1 except that the coating amount after drying was 17 g / m ² .

Example 4 Ink jet recording was carried out in the same manner as in Example 1 except that 10 parts of polyethylene fine particles having an average particle diameter of 15 μm (trade name: Florsen UF-1.5, manufactured by Sumitomo Seika Co., Ltd.) were used as the polymer fine particles. I got the medium.

Example 5 An ink jet recording medium was prepared in the same manner as in Example 1 except that 10 parts of polyethylene fine particles having an average particle diameter of 15 μm (trade name: Flowbeads HE-5023, manufactured by Sumitomo Seika Co., Ltd.) were used as the polymer fine particles. I got

Example 6 An ink jet recording medium was prepared in the same manner as in Example 1 except that 10 parts of polyethylene fine particles having an average particle diameter of 25 μm (trade name: Florsen UF-20, manufactured by Sumitomo Seika Co., Ltd.) were used as the polymer fine particles. Obtained.

Example 7 An ink jet recording medium was obtained in the same manner as in Example 1, except that 10 parts of a polyamide resin (trade name: Polyfix 3000, manufactured by Showa Kogyo KK) was used as the cationic resin.

Comparative Example 1 An ink jet recording medium was obtained in the same manner as in Example 1 except that polyethylene fine particles were not used in the preparation of the coating liquid for the ink receiving layer.

Comparative Example 2 Specific surface area 29 produced by an precipitation method as an amorphous silica pigment
Amorphous silica pigment having a particle size of 0 m ² / g and an average particle size of 1.9 μm (trade name: Fine Seal X-20, manufactured by Tokuyama Corporation) 1
An ink jet recording medium was obtained in the same manner as in Example 1 except that 00 parts were used.

Comparative Example 3 Specific surface area produced by sedimentation method 190 m ² / g, average particle size 1
1 μm amorphous silica pigment (trade name: Nipseal E
R, manufactured by Nippon Silica Industry Co., Ltd.), and an ink jet recording medium was obtained in the same manner as in Example 1 except that 100 parts were used.

Example 8 [Preparation of spherical urethane fine particles] Polyvinyl alcohol (trade name: PVA) was placed in a stirring and mixing vessel equipped with a heating device.
-117, manufactured by Kuraray Co., Ltd.) to obtain an aqueous medium for preparing spherical urethane fine particles. Separately, 5 parts of polymethylene polyphenyl isocyanate (trade name: Millionate MR400, manufactured by Nippon Polyurethane Industry Co., Ltd.) and 100 parts of divinylbenzene, 2-isocyanatoethyl-2,6-diisocyanate hexanoate (trade name: T- 100, manufactured by Toray Industries, Inc.) and 2 parts of 1,1′-azobis (cyclohexane-1-carbonitrile) (trade name: V
-40, manufactured by Wako Pure Chemical Industries, Ltd.), and a solution obtained by dissolving 2 parts thereof was used as a capsule core substance in the aqueous medium for preparing spherical urethane fine particles. K. The mixture was emulsified and dispersed at 8,000 rpm for 1 minute using a homomixer (manufactured by Tokushu Kika Kogyo KK).

The emulsified dispersion was added to diethylene triamine 1
And stirred at room temperature for 30 minutes.
The temperature was raised to 0 ° C., and the reaction was carried out for 3 hours while stirring was continued.
The temperature was lowered to room temperature to prepare a dispersion of spherical urethane fine particles having an average particle diameter of 10 μm. Next, the dispersion was filter-pressed and subsequently air-dried to prepare spherical urethane fine particles.

[Preparation of Inkjet Recording Medium] In place of polyethylene fine particles as polymer fine particles, spherical urethane fine particles 1 having an average particle diameter of 10 μm prepared above were used.
An ink jet recording medium was obtained in the same manner as in Example 1 except that 0 part was used.

Example 9 An ink jet recording medium was obtained in the same manner as in Example 8 except that the coating amount after drying was changed to 7 g / m ² .

Example 10 An ink jet recording medium was obtained in the same manner as in Example 8 except that the coating amount after drying was 17 g / m ² .

Example 11 An ink jet recording medium was obtained in the same manner as in Example 7 except that spherical urethane fine particles having an average particle diameter of 20 μm were prepared in [Preparation of spherical urethane fine particles] of Example 8.

Example 12 Ink jet was carried out in the same manner as in Example 8 except that 10 parts of spherical urethane fine particles having an average particle diameter of 10 μm (trade name: Meltex TU-514, manufactured by Sanyo Chemical Industries, Ltd.) were used as the polymer fine particles. A recording medium was obtained.

Example 13 Spherical urethane fine particles having an average particle diameter of 7 μm (trade name: Burnock CFB-101-40, trade name:
Example 8 except that 10 parts of Dainippon Ink and Chemicals, Inc. were used.
In the same manner as in the above, an ink jet recording medium was obtained.

Example 14 Spherical urethane fine particles having an average particle diameter of 14 μm as polymer fine particles (trade name: Vernock CFB-200W-4)
0, manufactured by Dainippon Ink and Chemicals, Inc.), and an ink jet recording medium was obtained in the same manner as in Example 8 except for using 10 parts.

Example 15 An ink jet recording medium was obtained in the same manner as in Example 8, except that spherical urethane fine particles having an average particle diameter of 30 μm were prepared in [Preparation of spherical urethane fine particles] of Example 8.

Example 16 An ink-jet recording medium was obtained in the same manner as in Example 8, except that 10 parts of a polyamide resin (trade name: Polyfix 3000, manufactured by Showa Polymer Co., Ltd.) was used as the cationic resin.

Comparative Example 4 Specific surface area 29 produced by an precipitation method as an amorphous silica pigment
Amorphous silica pigment having a particle size of 0 m ² / g and an average particle size of 1.9 μm (trade name: Fine Seal X-20, manufactured by Tokuyama Corporation) 1
An ink jet recording medium was obtained in the same manner as in Example 8 except that 00 parts was used.

Comparative Example 5 Specific surface area 190 m ² / g, average particle size 1 produced by sedimentation method
1 μm amorphous silica pigment (trade name: Nipseal E
R, manufactured by Nippon Silica Industry Co., Ltd.), and an ink jet recording medium was obtained in the same manner as in Example 8.

[Quality Comparison Test] The following evaluation tests were performed on the ink jet recording media prepared in Examples and Comparative Examples. Table 1 shows the results.

Evaluation 1 [Image Reproducibility] Inkjet printer PM- manufactured by Seiko Epson Corporation
Using 770C, printing of density gradation was performed at a recording density of 1440 dpi, and the linearity of the printing area ratio and the printing density was used as a scale of image reproducibility. (Evaluation criteria) ：: good, Δ: slightly poor, ×: impractical.

Evaluation 2 [Print Drying Property] Solid printing was performed using an ink-jet printer “DeskJet560J” manufactured by Hewlett-Packard Company, and the dry state of the portion was visually evaluated. did. (Evaluation criteria) ○: good (2 seconds or less), ×: slightly poor (2
〜１０: Impossible (more than 10 seconds).

Evaluation 3 [Surface strength] Using a friction tester II type (Gakushin type) described in JIS-L-0849, the mass of the friction element was set to 400 g, and the test piece was ink-received on the tip of the friction element and on the test piece stand. The layers were mounted facing each other, rubbed back and forth 10 times between test pieces 100 mm, and evaluated based on the presence or absence of the ink receiving layer surface falling off and the degree of paper dust generation. (Evaluation criteria) ：: good, Δ: slightly poor, ×: impractical.

Evaluation 4 [Water resistance] Ink jet printer PM- manufactured by Seiko Epson Corporation
Solid printing is performed using 770C, and left for one day. The printed matter left for one day is immersed in water for 5 minutes. After the printed matter was air-dried, the bleeding of the ink in the printed part was visually evaluated. (Evaluation criteria) ：: good, Δ: slightly poor, ×: impractical.

Evaluation 5 [Transportability] Inkjet printer PM- manufactured by Seiko Epson Corporation
Using 770C, solid printing was continuously performed to evaluate the conveyance status. (Evaluation criteria) ：: good, ×: slightly inferior, xx: not practical.

[0068]

[Table 1]

[0069]

As is clear from the results in Table 1, the ink jet recording medium obtained in the examples of the present invention has functions such as image reproducibility and print drying property as an ink jet recording medium, and An excellent ink jet recording medium having a high surface strength and little paper dust.

Claims (4)

[Claims] 1. An ink jet recording medium comprising an ink receiving layer containing amorphous silica having an average particle diameter of 2 to 10 μm and an adhesive on a support, wherein the ink receiving layer further has an average particle diameter of 3 to 10. An ink jet recording medium containing polymer fine particles of from 40 to 40 μm. 2. The ink jet recording medium according to claim 1, wherein the ink receiving layer further contains a cationic resin. 3. The ink jet recording medium according to claim 1, wherein the polymer fine particles are polyethylene fine particles. 4. The ink jet recording medium according to claim 1, wherein the polymer fine particles are spherical urethane fine particles.