JPH10226152A - Ink jet recording medium and ink jet recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording medium holding a good printing grade and water resistance having the draping and touch of a support in an ink jet type printer. SOLUTION: In an ink jet recording medium wherein an ink receiving layer is provided on the surface of a support, the peaks of the pore distribution curve of the ink jet recording medium are substantially present at one or more place within a range of 1μm below 5μm and at one or more place within 5μm-below 80μm and the peaks of the pore distribution curve of the support is substatially present at one or more place within a range of 1μm below 5μm and at one or more place within a range of 5μm-below 80μm.

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 used in an ink jet recording system for recording by flying ink as droplets, and more particularly to an ink jet recording medium having a texture of a support. . The present invention also relates to an ink jet recording method for performing recording using the ink jet recording medium.

[0002]

2. Description of the Related Art An ink jet recording system is a system in which minute droplets of ink are made to fly and adhere to a recording medium such as paper by various operation principles to record images, characters, etc. It has features such as easy multi-coloring, high flexibility in recording patterns, and no need for development-fixing. It has rapidly spread to recording devices for various figures including characters, color images, and various other uses. I have.

[0003] High-speed absorption of ink to a recording medium,
In addition to high absorption capacity, high density printing, and improvement in image quality, various feelings and hand feelings have been required. In particular, recently, the demand for the texture and feel of the support has been increasing.

[0004]

Problems to be Solved by the Invention
No. 87 discloses an ink jet recording paper provided with an ink-absorbing coating layer on the surface of a support, and the peak of a pore distribution curve of the whole ink receiving layer is at least 0.2.
It is characterized in that it is located at two places of not less than μm and not more than 10 μm and not more than 0.05 μm. Also, JP-A-58-1102
No. 88 discloses high quality paper-like ink jet recording paper of high print quality, and the peak of the pore distribution curve of the sheet is 0.2 μm or more and 10 μm or less and 0.05 μm or less.
m or less.

[0005] However, a recording sheet provided with a coating layer as disclosed in JP-A-58-110287 is called a so-called coated paper, and has good smoothness and water resistance, but it is difficult for the support to be used. The texture could not be expressed. This is because the filler completely covers the support. The peak appearing below 0.05 μm in the pore distribution curve is presumed to be due to this filler. See also
Japanese Patent Application Laid-Open No. 8-110288 discloses a high quality paper-like ink jet recording paper which can express the texture of a support to some extent, but has drawbacks such as low density and poor water resistance due to deep penetration of ink. was there.

When a conventional support is used as it is,
The ink density was low, feathering occurred, and the character quality was extremely deteriorated. In addition, since water resistance is low, there is a problem that bleeding occurs when moisture adheres.

[0007]

In view of the above situation,
SUMMARY OF THE INVENTION An object of the present invention is to provide an ink jet recording medium which maintains good print quality and water resistance, and has a feeling of a support and a feeling of touch in an ink jet printer. That is, the present invention provides an ink jet recording medium comprising an ink receiving layer provided on the surface of a support, wherein the peak of the pore distribution curve of the ink jet recording medium is at least one spot in a range of 1 μm or more and less than 5 μm. One or more places in a range of less than 80 μm,
It is substantially present, and one or more peaks of a pore distribution curve of the support in the range of 1 μm or more and less than 5 μm
An ink jet recording medium characterized by being substantially present at one or more places in a range of not less than 80 μm and not more than 80 μm.

In order to realize a good texture, it is a precondition that the texture of the support is good. here,
The pores having a size of 5 μm or more and less than 80 μm existing in the support greatly affect the feeling of touch, and contribute to expressing the texture due to minute unevenness on the surface of the support. Therefore,
By having the peak of the pore distribution in the above range, a good texture is realized.

The character quality can be improved by improving the fixability of the colorant in the ink. Here, the pores of 1 μm or more and less than 5 μm in the support contribute to fixation of the colorant in the ink, and by having a peak of the pore distribution in this range, good character quality is realized. .

As described above, in order to realize good texture, character quality, and excellent water resistance, it is a precondition that the pore distribution of the support satisfies the above requirements. However, the above effects cannot be achieved unless the pore distribution is maintained after the application step. That is, it is necessary to satisfy the requirements of the pore distribution for both the support and the entire coated paper.

[0011]

Next, a preferred embodiment of the ink jet recording medium of the present invention will be described in detail.

As the support used in the ink jet recording medium of the present invention, a support in which the peak of the pore distribution curve substantially exists at one place at 1 μm to less than 5 μm and at one or more places at 5 μm to less than 80 μm is used. The peak appearing at 1 μm or more and less than 5 μm is based on the pores of cellulose fibers in the paper,
The peak appearing below μm is due to the entanglement of the cellulose fibers. In particular, in order to express the texture peculiar to the support, it is necessary to have one or more peaks in the range of 5 μm or more and less than 80 μm.

The support is usually made of paper made of natural pulp. Among them, kenaf paper is preferably used in the present invention. Kenaf is an annual plant grown in Thailand, China, Australia and other countries, and is attracting attention as an alternative to wood as a material for paper pulp. Since the US Department of Agriculture pioneered the use of kenaf in the 1950s, basic and industrial-level research has been conducted, and numerous proposals have been made. For example, Japanese Patent Publication No. 2-42952 proposes to use kenaf woody chemical pulp in combination with thick-walled textile pulp to improve the poor smoothness of the thick-walled textile. Also,
Japanese Patent Application Laid-Open No. 2-91297 proposes a method for improving the performance of mechanical pulp by using kenaf pulp in combination with mechanical pulp. Also,
JP-A-2-88286 and JP-A-2-92576 disclose the use of kenaf pulp in combination with ordinary pulp to provide heat-sensitive recording paper,
There have been proposals for obtaining a base paper for pressure-sensitive copying paper. Japanese Patent Application Laid-Open No. 6-262868 proposes a method for obtaining a thermal transfer receiving paper.

The thickness of the support is preferably from 10 to 200 μm, and the basis weight is preferably from 10 to ²⁰⁰ g / m ² . In order to form an ink-receiving layer having good water resistance, there is an appropriate range in the degree of Stigcht size of the support. In other words, the Steckigt sizing degree is preferably from 40 seconds to 220 seconds based on a basis weight of 127 g / m ² . If the time is less than 40 seconds, the ink penetrates deeply into the support, causing problems such as strikethrough and cockling.

When kenaf paper is used, the weight ratio of kenaf pulp to wood pulp is preferably from 10:90 to 100: 0. If the content of kenaf pulp is 10% or less, the texture unique to kenaf paper is impaired, which is not preferable.

In the recording medium of the present invention, an ink receiving layer is provided on at least one surface of the support. The ink receiving layer contains alumina hydrate and / or amorphous finely divided silica.

The alumina hydrate is represented by the following general formula. Al ₂ O _3-n (OH) _2n · mH ₂ O [wherein n represents any one of 0, 1, 2 and 3 and m represents a value of 0-10, preferably 0-5. Express. m can be a non-integer value, since mH ₂ O often represents a desorbable aqueous phase that does not participate in the formation of the crystal lattice. Further, m may reach a value of 0 by burning this kind of alumina hydrate. ]

The alumina hydrate suitable for the practice of the present invention is an alumina hydrate showing a boehmite structure or an amorphous structure by X-ray diffraction analysis.
Nos. 25437, 5-125438, 5-
It is preferable to use the alumina hydrate described in JP-A Nos. 125439 and 6-114571. Especially transparency,
The alumina hydrate is preferably a boehmite structure or an amorphous compound from the viewpoint of color development and ink adsorbability, and is preferably a tabular alumina hydrate having an average aspect ratio of 3 to 10.

The amorphous finely divided silica preferably has a high specific surface area and a high pore volume. Specifically, the BET specific surface area is from 180 to 420 m ² / g, and the BET pore volume is from 0.1 to 420 m ² / g.
Those having a concentration of 5 to 1.8 ml / g are used in the present invention. BET
If the specific surface area and the BET pore volume are smaller than the above values, the solvent component and the dye component in the ink cannot be completely absorbed, the ink overflows on the medium surface, the dot diameter increases, and the water resistance deteriorates. I do. On the other hand, when the value is larger than the above value, the dot diameter becomes extremely small and the density is lowered, which is not preferable. This amorphous finely divided silica is preferably present on at least one surface of the support at 30 to 60% by weight of the total coating solids. If the amount is less than 30% by weight, the absorption capacity of the ink decreases, and the ink bleeds, which is not preferable. 60% by weight
If the amount is larger than this, the image quality is good, but silica powder is generated, which is not preferable.

Other white pigments may be used in combination depending on the purpose of use of the paper and the required performance of the printer. These white pigments include zeolite, calcium carbonate, diatomaceous earth, kaolin clay, calcined clay, talc, aluminum hydroxide, colloidal alumina, pseudoboehmite, alumina, barium sulfate, titanium dioxide, zinc oxide, zinc carbonate, magnesium silicate, carbonate Examples include pigments generally used for paper coating, such as magnesium and organic pigments (plastic pigments). In order to make these pigments paints, it is necessary to disperse them uniformly in water.For this purpose, for example, a usual dispersant such as sodium polyacrylate, phosphate, surfactant, etc. is added. Is preferred.

Further, in the present invention, it is preferable that the ink receiving layer contains a cationic substance. Specific examples include quaternary ammonium salt-type compounds such as hydrochlorides and acetates such as laurylamine, stearylamine, and rosinamine. Specific examples include benzyltributylammonium chloride, lauryltrimethylammonium chloride, and benzalcoyl chloride. , Benzethonium chloride, etc.
Specific examples of the pyridinium salt-type compound include cetylpyridinium chloride and cetylpyridinium bromide, and examples of the ethylene oxide adduct of a higher alkylamine include dihydroxyethylstearylamine. In addition, polyallylamine or a salt thereof, polyamine sulfone or a salt thereof, polyvinylamine or a salt thereof, chitosan or a salt thereof, and the like can be given. Further, a part of the nonionic substance may be cationized. Specific examples thereof include a polymer of vinylpyrrolidone and a quaternary salt of aminoalkyl alkylate, and a copolymer of acrylamide and a quaternary salt of aminomethylacrylamide, but are not limited to these compounds. Needless to say. The amount of the cationizing agent to be added is 5 to 40 with respect to the total solid content of the paint in the ink receiving layer.
% By weight.

Further, in the present invention, it is preferable to use a binder. For example, polyvinyl alcohol, modified polyvinyl alcohol, polyacrylamide, vinyl acetate,
Conjugated diene copolymers such as oxidized starch, etherified starch, cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, casein, gelatin, soy protein, maleic anhydride resin, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer, etc. Copolymer latex, acrylic polymer latex such as copolymer of acrylic acid ester and methacrylic acid ester, or vinyl polymer latex such as ethylene vinyl acetate copolymer, or carboxyl group of these various polymers Aqueous binders such as thermosetting synthetic resins such as functional group-modified polymer latex, melamine resin, and urea resin with functional group-containing monomers such as polymethyl methacrylate, polyurethane resin, unsaturated polyester resin, and vinyl chloride-vinyl acetate Copolymer Polyvinyl butyral, it includes synthetic resin binder and these ionically modified resins such as alkyd resins, used in one or more. Of these, a water-soluble polymer binder is preferably used in the present invention. The amount of the binder is preferably 15 to 35% by weight of the total coating solids on at least one surface of the support. If the amount is less than 15%, powder falling of silica or alumina described below occurs. If the amount is more than 35% by weight, water resistance is poor, which is not preferable.

A surfactant may be used in the ink receiving layer of the present invention. For example, anionic surfactants such as carboxylate, sulfonate, sulfate, phosphate and the like, aliphatic amine salt, aliphatic quaternary ammonium salt, aromatic quaternary ammonium salt, heterocyclic quaternary ammonium Cationic surfactants such as salts, polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, ether types such as polyoxyethylene polyoxypropylene block polymers, polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, etc. Nonionic surface activity such as ether ester type, ester type polyoxyethylene fatty acid amide such as polyethylene glycol fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester and nitrogen-containing type such as polyoxyethylene alkylamine , Betaine, aminocarboxylates, and amphoteric surfactants such as imidazoline derivatives.

In the ink receiving layer of the present invention, other additives such as a pigment dispersant, a thickener, a flow improver, an antifoaming agent, a foam inhibitor, a release agent, a foaming agent, a penetrant, a coloring agent Pigments, coloring dyes, fluorescent whitening agents, ultraviolet absorbers, antioxidants, preservatives, anti-binders, water-proofing agents, monomers, polymers, ink setting agents, and the like can be appropriately compounded.

In the present invention, a sizing agent, a dry paper strength improver, a wet paper strength improver, a retention improver, a water repellency improver, a colorant, a defoamer, a slime control agent and the like usually used in a papermaking process are used. May be added.

The above composition is provided as an ink receptive coating layer on a support at 1 to 12 g / m ² . If it is less than 1 g / m ² , the print density, print quality, and water resistance are reduced. If it is more than 12 g / m ² , the distribution of 5 μm or more in the pore distribution changes from the distribution of 5 μm or more of the support. It is not preferable because the texture of the body is greatly impaired.

The coating liquid of the present invention is prepared by uniformly dispersing and dissolving the above-mentioned components in water by a usual method. As a dispersing method, it is preferable to use a dispersing machine such as a ball mill, an attritor, a sand mill, a homomixer, a microfluidizer (manufactured by Microfluidex), a nanomizer (manufactured by Nanomizer), and the like.

In the method for producing a recording medium for an ink jet according to the present invention, after obtaining the support, at least one or more ink-receiving layers are coated with the coating liquid using a coating apparatus or a size press. Provide. As a coating method, either an on-machine coater or an off-machine coater may be used.
Conventionally known air knife coater, die coater, blade coater, gate roll coater, bar coater,
Rod coater, roll coater, gravure coater,
A curtain coater or the like can be used. After coating, the coating liquid is dried by blowing hot air. The temperature and air volume of hot air vary depending on the support and coating solution used, but 70 ° C
To 160 ° C. is preferred. When the temperature is lower than 70 ° C., it takes a long time to dry. When the temperature is higher than 160 ° C., the support and the coating liquid are undesirably denatured.

In the present invention, a back coat layer may be provided on the surface of the substrate opposite to the surface on which the ink receiving layer is coated. The composition of the back coat layer may be the same as or different from the composition of the ink receiving layer, and there is no limitation on the coating amount, coating method, and the like.

Further, after the coating, a calendering treatment such as a machine calender, a super calender, a soft calender, or the like may be performed within a range that does not impair the pore distribution of 5 μm or more of the support.

The ink-jet recording medium according to the present invention thus produced has a pore distribution curve whose peak is substantially the same as the pore distribution curve of the support, and at least one peak of 1 μm or more and less than 5 μm. 5 μm or more and 80 μm
There is less than one place.

The measurement of the pore distribution curve referred to in the present invention is based on the QUA
It was determined by a mercury intrusion method using a porosimeter, Autoscan 500 and Autoscan 33 manufactured by Antachrome. The surface tension of mercury was 485 dyn / cm, and the contact angle used was 135 degrees. Measurement is about 0.3 samples
g was precisely weighed and the cumulative pore volume per unit sample (cc / g) was measured by the above-mentioned porosimeter, and this was differentiated and plotted as a frequency with respect to the pore radius (μm).

The ink used in the present invention includes the following colorants:
A recording medium comprising a liquid medium and other additives. Examples of the colorant include a direct dye, an acid dye, a basic dye, a reactive dye, and a water-soluble dye such as a food colorant. Water and various water-soluble organic solvents can be used as the liquid medium.

The ink jet recording medium of the present invention can be used not only in the ink jet recording method but also in any recording method using a liquid ink at the time of recording. As such a recording method, for example, a heat-fusible substance, a medium in which a heat-fusible ink mainly containing a dye or the like is applied on a thin base material such as a resin film, high-density paper, and synthetic paper, A thermal transfer recording method in which the ink is melted and transferred from the backside, a solid ink jet recording method in which the heat-fusible ink is heated and melted to form small droplets, and the ink is dissolved in a solvent. Examples include an ink jet recording method used, a recording method using a photosensitive pressure-sensitive donor sheet using microcapsules containing a photopolymerizable monomer and a colorless or colored dye or pigment, and the like. The common feature of these printing methods is that the ink is in a liquid state during printing. Liquid ink is cured,
Before solidification or fixing, the ink permeates or diffuses in the depth direction or the horizontal direction of the ink receiving layer of the recording medium. These recording media for various recording systems require absorptivity according to each system, and there is no problem even if the inkjet recording medium of the present invention is used as these recording media. Further, the ink jet recording medium of the present invention may be used as a recording medium for heating and fixing an electrophotographic recording toner widely used in copiers and printers.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the contents of the present invention will be described in more detail using embodiments. [Support] The support used in Examples 1 to 6 was prepared as follows. The measurement of the Stekigt sizing degree of the support is performed according to JIS.
Performed according to the method described in P8122. (1) Support 1 Kenaf paper having a basis weight of 127 g / m ² (kenaf GA field manufactured by Mishima Paper Co., Ltd., kenaf pulp content: 70%). The Stöckicht sizing degree was 50 seconds. (2) Support 2 Kenaf paper having a basis weight of 127 g / m ² (Kenaf 100 manufactured by Mittori Paper Co., Ltd., kenaf pulp content: 100%). The Steckigt sizing degree was 190 seconds. The pore distribution curves of the supports 1 and 2 are shown in FIGS. Table 2 shows the peak value of the pore distribution (exponential pore volume distribution dv (logr)).

[Preparation of Coating Liquids] Coating liquids A to C having the following compositions were obtained. (1) Coating liquid A After stirring 5920 g of an aqueous dispersion having the following formulation with a stirrer for 30 minutes, a harmonizer (manufactured by Nanomizer Co., Ltd.)
To perform a dispersion treatment at a pressure of 10 kg / cm ² . The viscosity of the prepared coating liquid was 450 cps (25 ° C.).

Amorphous silica ^{* 1} 380 g pseudo-boehmite ^{* 2} 20 g Waterproofing agent (benzethonium chloride) ^{* 3} 80 g Waterproofing agent (benzalkonium chloride) ^{* 4} 200 g Binder (polyvinyl alcohol) ^{* 5} 2400 g Ink setting agent ^{* 6} 240 g Deionized water 2600 g * 1 P-78A manufactured by Mizusawa Chemical Industry Co., Ltd. (BET specific surface area 350 m ² / g BET pore volume 1.53 ml /
g) * 2 The one described in Example A of JP-A-7-89221 was used. * 3 Hyamine 1622 manufactured by Sankyo Chemical Industry Co., Ltd. * 4 Cation 08B (50 manufactured by Morin Chemical Industry Co., Ltd.)
% Aqueous solution) * 5 PVA-117 manufactured by Kuraray Co., Ltd. (10% aqueous solution) * 6 Sumirezu Resin 100 manufactured by Sumitomo Chemical Co., Ltd.
1

(2) Coating liquid B Coating liquid A was prepared using 380 g of P-78F manufactured by Mizusawa Chemical Industry Co., Ltd. instead of silica P-78A (P-78F BET specific surface area: 390 m ² / g BET pores) Volume 1.69 ml / g). The viscosity of the prepared coating liquid is 4
80 cps (25 ° C.).

(3) Coating liquid C Alumina hydrate (Example A in JP-A-7-89221)
60 g of the described product, BET specific surface area 76 m ² / g BET pore volume 0.57 ml / g) was put into 240 g of ion-exchanged water, stirred for 30 minutes with a stirrer, and then 8000 rpm for 30 minutes with a homomixer for 30 minutes. This was dispersed to obtain an alumina slurry. Next, 45 g of the alumina slurry was weighed, and a quaternary ammonium salt type water-soluble resin (Yasutex H-90 manufactured by Nagase Kasei Kogyo Co., Ltd., active ingredient concentration: 100%) 20
g, benzethonium chloride (Hyamine 1622 manufactured by Sankyo Kasei Kogyo Co., Ltd., active ingredient concentration: 100%), silicon defoamer (FS Antifoam 91 manufactured by Dow Corning)
Active ingredient concentration 16%) 1.5 g, ion-exchanged water 229
g was added and stirred for 30 minutes with a three-one motor.
The viscosity of the prepared coating liquid was 330 cps (25 ° C.).

[Preparation of Recording Medium] The above-mentioned coating solution was applied to one side of the above support in a combination shown in Table 1 to prepare a recording medium. These are Examples 1 to 6. Coating method Air knife coater Coating amount Table 1 shows. Drying temperature 100 ° C. Hot air Drying time 5 minutes For Example 4, nip pressure 120 kg /
cm.

[Evaluation Method] The manufactured recording media were evaluated for the following items. (1) Pore distribution The pore distribution of the recording medium produced by the same method as when the pore distribution of the support was measured was measured. (2) Recording evaluation Recording for evaluation was performed using an inkjet printer (BJC-600S, manufactured by Canon Inc.) (3) Image density Optical density of solid printing portions of yellow, magenta, cyan, and black Was measured with a Macbeth densitometer RD-918. (4) Print quality A straight line having a width of 1 dot was printed in parallel with the scanning direction of the head.
Evaluation was made visually from a distance of 25 cm.
A that can be visually recognized as a clear straight line is denoted as A, and B and C are ranked as the line becomes more unclear. (5) Immersion water resistance The solid printed portion was immersed in tap water for 3 minutes, then pulled up.
Air dried. It was visually confirmed whether or not ink flow occurred after drying. A where no ink flow was observed was designated as A, and B and C as the ink flowed. (6) Drop Water Resistance Nine lines were printed at 2 mm intervals in a 2 cm square frame by a printer in a checkered pattern, and one drop of tap water was dropped at the center with a dropper. After air-drying, the gothic lines were distorted and visually checked for blurring. A with no distortion or bleeding was denoted as A, and B and C as flowing. (7) Texture The support and the recording medium manufactured according to this example were compared by touch and visual observation. A, in which the texture hardly changed, was designated A, and B, C as the texture changed.

[Evaluation Results] (1) The measurement results of the pore distribution of the recording media of Examples 1 to 6 are shown in FIGS. 3 to 8, and the peak value (exponential pore volume distribution dv (logr)) of each pore distribution is shown. )) Are shown in Table 2. (2) Table 1 shows the performance evaluation results of the recording medium. Example 1
It is clear that Nos. 6 to 6 show excellent characteristics in all of print quality, water resistance and hand.

[0043]

[Table 1]

[0044]

[Table 2]

[0045]

As described above, in the ink jet recording medium of the present invention, the peak of the pore distribution curve is at one or more places in the range of 1 μm to less than 5 μm, and 5 μm to 80 μm.
And the support also has one or more peaks in the range of 1 μm or more and less than 5 μm, and one or more peaks in the range of 5 μm or more and less than 80 μm. Texture, print quality,
Excellent water resistance.

[Brief description of the drawings]

FIG. 1 is a pore distribution curve of a support 1.

FIG. 2 is a pore distribution curve of a support 2.

FIG. 3 is a pore distribution curve of a recording medium of Example 1.

FIG. 4 is a pore distribution curve of a recording medium of Example 2.

FIG. 5 is a pore distribution curve of a recording medium of Example 3.

FIG. 6 is a pore distribution curve of a recording medium of Example 4.

FIG. 7 is a pore distribution curve of a recording medium of Example 5.

FIG. 8 is a pore distribution curve of a recording medium of Example 6.

Claims (5)

[Claims] 1. An ink jet recording medium comprising an ink receiving layer provided on the surface of a support, wherein the peak of a pore distribution curve of the ink jet recording medium is 1 μm or more and 5 μm or more.
at least one place in the range of less than m, one or more places in the range of 5 μm to less than 80 μm, and one or more peaks in the pore distribution curve of the support in the range of 1 μm to less than 5 μm. An ink jet recording medium, which is substantially present at one or more locations within a range of 5 μm or more and less than 80 μm. 2. The ink jet recording medium according to claim 1, wherein the ink receiving layer contains alumina hydrate and / or amorphous finely divided silica. 3. The ink jet recording medium according to claim 1, wherein the support contains kenaf pulp in an amount of 10% by weight or more and 100% by weight or less. 4. The ink jet recording medium according to claim 1, wherein the support has a Stigget sizing degree of 40 to 220 seconds based on a basis weight of 127 g / m ² . 5. An ink jet recording method using the ink jet recording medium according to any one of claims 1 to 4, wherein recording is performed by flying fine droplets of ink and attaching the ink droplets to the ink jet recording medium.