JPH09156204A - Ink jet recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording method using a high-grade ink jet recording medium of high image quality excellent in ink receptivity (water absorbability), drying properties, image density and sharpness and not generating blocking or superposed colour blur. SOLUTION: The pore vol. per a unit area of the ink receiving layer of an ink jet recording medium formed by providing at least one or more ink receiving layer on a support is set to 50-150% of the max. ink emitting amt. per a unit area of one color. It is pref. that the film thickness of the ink receiving layer is 5-30μm and an average pore size is 40-200Å in order to more develop effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inkjet recording method, and more particularly, to improvement of a recording medium used in various inkjet recording type devices.

[0002]

2. Description of the Related Art The ink jet recording system is one in which minute droplets of ink are ejected by various operating principles and adhered to a recording medium such as paper to record images, characters, etc. Since it is possible to perform high-speed recording and is easily multicolored, it is applied to various printers, plotters, and the like, and is used in various fields.

As the recording medium used in the ink jet recording system, not only each medium such as high-quality paper and coated paper but also these recording media can be used efficiently, and the recording apparatus and the ink composition surface can be improved so that the image reproducibility is excellent. Also, improvement efforts are being made.

However, at the present time, it is not yet satisfactory, and further improvement efforts are desired. In addition, as the performance of recording devices such as higher recording speed and higher definition is improved, and as the applications are expanded, such as multi-color and full-color, more advanced characteristics are required for recording paper. There is.

Several proposals have hitherto been made to solve these problems. For example, JP-A-52-53
No. 012 discloses an ink jet recording medium obtained by wetting a low-sized base paper with a coating material for surface processing, and JP
No. 3-49113 discloses an inkjet recording medium in which a sheet containing urea / formalin resin powder is impregnated with a water-soluble polymer. Also, JP-A-55-583
No. 0 discloses an ink jet recording medium having an ink-absorbing coating layer on the surface of a support, and JP-A Nos. 55-51583 and 56-157 disclose non-colloidal silica powder as a pigment in a coating layer. The example used is further disclosed in JP-A-55-11829.
The publication discloses an example of a smear paper having a two-layer structure having different ink absorption rates. Further, the above-mentioned JP-A-55-515
No. 83 and No. 56-157 disclose a combined use example of non-colloidal silica and starch for the purpose of adjusting absorption and spread of ink.

The non-coat type ink jet recording medium (hereinafter also referred to as "recording medium") itself must have absorbency, and a small amount of non-sized paper or sizing agent is added or the filler is increased. There is a method to make low-sized paper. However, such a recording medium has good absorbability when recording with an aqueous ink,
Image chromaticity, sharpness, print dot density, image density, etc. are low, and the feathering of the bird's feathers (feat)
The deterioration of the dot shape called "hering" and the blurring around the dots may cause the inconvenience that the ink deeply penetrates into the base paper layer and even escapes to the back surface.

On the other hand, the coating type recording medium is a recording medium having a coating layer using a non-sized paper or a low-sized paper as a support and has a good absorbability, and the color quality, sharpness, feathering and ink of an image are excellent. This is an improvement over non-coated type recording media in terms of strike-through. In particular, an image recorded on a recording medium provided with a coating layer containing an amorphous silica powder and a water-soluble polymer substance as an image receiving layer has very excellent color
Shows sharpness and resolution, and improves feathering and ink strikethrough. However, the improvement in absorbability is insufficient, and further, the decrease in image density becomes a problem.

Further, a recording medium provided with a coating layer, such as high-size paper, polyethylene terephthalate (PET) film, or synthetic paper, which does not absorb the solvent of the water-based ink or has low absorbability, is used as a support. Since the body itself hardly absorbs the ink solvent, the dye is retained on the surface of the recording medium, and it is easy to obtain a good image in terms of print dot density, image density, color, sharpness, feathering, strikethrough, etc. ,
When the coating amount is low, the ink absorbency is poor and the absorption capacity is also small. For this reason, when the coating amount is increased for the purpose of increasing the absorption capacity, the adhesiveness of the coating layer, powder drop and the like tend to deteriorate, and improvement in this aspect is necessary.

These coat type recording media are excellent in color and sharpness, have less feathering and strike-through, and easily obtain good images because amorphous silica powder and alumina sol are used. It is considered that the initial amount of voids inside the particles is large and the amount of ink absorbed in the powder, that is, in the coating layer is large. JP-A-6-48016 and 6-1
99034, 6-199035, 6-2552.
No. 35, etc., describes preferable pore volume, pore radius and the like. However, these alone are not sufficient to improve the absorption rate.

As described above, the ink jet recording medium is required to have the following characteristics.

(1) The ink absorbency is good, and bleeding or stain does not occur.

(2) A clear print record is obtained, and the resolution and print density are high.

(3) Diffusion of ink dots in the lateral direction does not increase more than necessary and is uniform (print dot shape is good).

(4) The ink has good dryness and is free from unevenness and curling.

(5) Water resistance is high, and ink does not flow out of a recorded image during storage due to moisture or the like.

(6) In the case of a color image, there is no color shift, the color is vivid, and the coloring and gradation are excellent.

(7) Curling in a wide range of temperature and humidity is small, and the running property when recording is normally performed by a recording device is good.

(8) The image storability such as light resistance and ozone resistance of the recorded image is good.

(9) In the coating type recording medium, the coating layer has high adhesiveness and little powder drop.

(10) It is difficult for the recording medium itself to turn yellow.

(11) Compared with the dot diameter in the single color area,
To obtain a high-definition recorded image by reducing the bleeding in the heavy-colored part, with almost no change in the dot diameter in the heavy-colored part.

[0022]

The object of the present invention is to obtain excellent ink receptivity (water absorption), drying property, image density and sharpness, without blocking, bleeding of heavy colors, etc. and high quality. An inkjet recording method using an inkjet recording medium with high image quality is provided.

[0023]

The above object of the present invention is to provide an ink jet recording medium comprising at least one ink receiving layer on a support, wherein the pore volume per unit area of the ink receiving layer is: This is achieved by an inkjet recording method in which 50 to 150% of the maximum ink discharge amount per unit area of one color is achieved.

The thickness of the ink receiving layer is 5 to 30 μm.
That is, the average pore diameter of 40 to 200Å is a preferable mode because the effect of the present invention can be further exhibited.

Generally, in the case of the ink jet recording system,
If the ink absorbency of the recording medium is increased more than necessary, the density of the recorded image will be lowered, the sharpness of the hue and the color developability will be deteriorated, and the resolution will be deteriorated. On the other hand, if the ink absorbency is suppressed, the image density becomes high, but there is a problem that the image quality is deteriorated due to overprinting or uneven density, or the ink drying property is deteriorated to cause scratches on the recording portion. There are conflicting issues regarding absorbency.

As a result of intensive studies to solve the conflicting problems as described above, the present inventors have found that the pore volume per unit area of the ink receiving layer and the maximum ink discharge amount per unit area of one color. The inventors have found that an ink jet recording medium having excellent quality characteristics, which cannot be predicted from the conventional techniques, can be obtained by specifying the ratio of the above and the present invention, and completed the present invention.

The present invention will be described in more detail below.

In the ink jet recording system of the present invention, the pore volume per unit area of the ink receiving layer having at least one layer on the support is 50 to 150% of the maximum ink discharge amount per unit area of one color. However, there is a feature.

When the ratio of the maximum ink discharge amount is less than 50%, the ink absorption capacity is insufficient, the absorption speed is considerably slowed, and bleeding, beading, etc. occur, and the print quality deteriorates. On the contrary, when the ratio exceeds 150%, the ink absorption speed and the drying are satisfactory, but the print density is lowered, which also causes the deterioration of the print quality.

Considering the print density, the thickness of the ink receiving layer is preferably 5 to 30 μm. Further, the average pore diameter of the ink receiving layer is preferably 40 to 200Å. On the contrary, when the average pore diameter is less than 40Å, the absorption speed of the ink is slowed down, and when it exceeds 200Å, the absorption of the ink on the recording medium becomes conspicuous in the lateral direction, causing bleeding and thickening of characters.

The porous material usable in the present invention is not particularly limited as to the material of the inorganic particles, but it is easy to obtain fine particles of inorganic oxide particles such as alumina or silica having a controlled particle size. In terms of Alternatively, a xerogel prepared by growing crystal particles produced by neutralizing or hydrolyzing the following inorganic compound may be used. Further, it is also preferable to use sol-shaped fine particles such as alumina sol and silica sol.

The above-mentioned inorganic compound is an aluminum salt such as aluminum sulfate, aluminum nitrate, aluminum chloride and the like, an alkali metal aluminate such as sodium or potassium aluminate, or a water-soluble aluminum compound of both. A gel obtained by neutralizing an aqueous solution or performing ion exchange using an ion exchange resin can be used. Alternatively, a gel obtained by using a salt of silicon such as sodium silicate in the same manner as aluminum may be used.

The average pore diameter of the inorganic particles is preferably 20 to 400 Å in view of the ink absorption speed and the absorption capacity.
Furthermore, 40 to 200Å is more preferable.

The particle size of the inorganic fine particles is preferably 0.01 to 10 μm, more preferably 0.02 to 1 μm. The pore volume is preferably 0.5 to 5.0 cc / g, 1.0 to 2.5
More preferred is cc / g.

In the present invention, the pore volume and the pore diameter are ME
RCURY PRESSURE PROSIMETE
R MOD. 220 (manufactured by Carlo Erba) using a so-called mercury porosimetry method to obtain a void volume distribution curve (Urano "Surface" 13 (10), 558 (1975),
Onogi, Yamauchi, Murakami, and Imamura, "Paper and Paper Cooperative Magazine", pp. 28, 99 (1974)), the pore size can be calculated by calculating the pore distribution.

The calculation of the pore size by mercury porosimetry was performed using the following formula (1), which was derived assuming that the cross section of the pore was circular.

Pr = 2a · cos θ (1) where P is the pressure applied to mercury, r is the pore diameter, a is the surface tension of mercury, and θ is the contact angle. The surface tension of mercury is 4
It was measured at 82.536 dyn / cm, the contact angle was 141 degrees, and the absolute mercury pressure was changed from 1 to 2000 kg / cm. Similarly, the cumulative pore volume per unit sample was measured.

The maximum ink discharge amount of one color per unit area is an ink head having a mode in which the size of the maximum ink droplet can be freely changed, and this ink head is used. 100c when the ink jet recording medium is hit in a single color with a droplet size of 720 dpi
It was defined as the ink amount per m ² (= 10 ^-2 m ² ).

Regarding the shape of the pores, it is preferable to use a uniform and straight line with a small labyrinth, and an ink bottle shape with a narrow entrance, a gourd shape with a twist in the middle, a meandering shape, etc. It is not preferable from the viewpoint of absorption rate.

The thickness of the ink receiving layer is strictly determined by the kind of the ink used and its solvent, the amount of the ink, etc., but it is generally suitable that the thickness is about 5 to 50 μm. Further, a thickness of 5 to 30 μm is more preferable. If the amount is less than the above range, the image absorbency is insufficient and the image is blurred. On the other hand, if the amount exceeds the above range, the image absorbency becomes too high and the dye may be absorbed and carried, so that an image may not be formed. Neither is preferable.

Examples of the binder to be used include polyvinylpyrrolidone, sodium polyacrylate, polyvinyl alcohol and modified products thereof, starch and modified products thereof, oxidized starch, etherified starch, cellulose such as vinyl acetate, carboxymethyl cellulose, hydroxyethyl cellulose and the like. Derivative, casein, gelatin, soy protein,
Silyl-modified polyvinyl alcohol, etc .; Conjugated diene copolymer latex such as maleic anhydride resin, styrene / butadiene copolymer, methyl methacrylate / butadiene copolymer: polymer or copolymer of acrylic acid ester and methacrylic acid ester Acrylic polymer latex; vinyl polymer latex such as ethylene / vinyl acetate copolymer; or functional group-modified polymer latex with a functional group-containing monomer such as carboxyl group of these various polymers; melamine resin, Aqueous binder such as thermosetting synthetic resin such as urea resin; polymethylmethacrylate, polyurethane resin, unsaturated polyester resin, vinyl chloride.
Examples thereof include synthetic resin binders such as vinyl acetate copolymer, polyvinyl butyral, and alkyd resin, which may be used alone or in combination of two or more.

When the amount of the binder used is too small, the inorganic particles cannot be sufficiently adhered to the paper surface. On the contrary, when the amount is too large, the inorganic particles have a sufficiently high definition image quality. It is not preferable because it cannot be revealed. Therefore, it is appropriate to use the binder in an amount of about 5 to 60% by weight, more preferably 20 to 40% by weight, based on the total amount of the inorganic particles.

The support used in the present invention is paper,
Alternatively, a thermoplastic resin film, a synthetic paper, a synthetic resin laminated paper such as a photographic support, and a sheet material such as a non-woven fabric mainly composed of wood fibers or synthetic fibers can be used. In the case of paper, with or without addition of internal sizing agent, neutral sizing agent,
Polymer sizes, acid sizes, and other sizing agents may be used alone or in combination, a filler may be included or not included, and there is no limitation with or without a size press. Internal support for paper support,
As the white pigment, conventionally known pigments are used, and they can be used alone or in combination, for example, light calcium carbonate, heavy calcium carbonate, kaolin, clay, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, carbonic acid. White inorganic pigments such as zinc, satin white, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic silica, aluminum hydroxide, alumina, lithopone, zeolite, magnesium carbonate, magnesium hydroxide; styrene plastic pigment, acrylic plastic Pigments, polyethylene, microcapsules, organic resins such as urea resins and melamine resins, and the like. Further, when the support is paper, it contains a neutral sizing agent and a filler and has a wood pulp / filler ratio of 9
0 to 70/10 to 30 (% by weight) and weighed 60 to
It is preferably 120 g / m ² , but is not limited in any way.

As a method for producing an ink jet recording medium, for example, pulp fibers are dissolved to form a slurry, and if necessary, a filler, a sizing agent and other additives are added, papermaking is carried out by a paper machine and dried, or papermaking is carried out. After that, an aqueous solution of starch or a polymer substance is size-pressed, dried and machine-calendered to obtain a support sheet, and at least one or more ink-receiving layers are applied using a coating device or a size press device. Set up. The maximum heating temperature of the dryer is at least 100 ° C or higher, preferably 120 ° C or higher. It is preferable that the temperature is higher in consideration of the drying efficiency, but the temperature is not particularly limited. The machine calendar may or may not be used, but it is preferable to use it in consideration of workability in the next coating step.

The method for providing the ink receiving layer may be either an on-machine coater or an off-machine coater.
For example, conventionally known air knife coater, curtain coater, die coater, blade coater, gate roll coater, bar coater, rod coater, roll coater, bill blade coater, short dwell blade coater, slide hopper coater and the like can be used.
Further, after coating, finishing is performed using a calendar such as a machine calendar, a super calendar, and a soft calendar.

In the present invention, other additives such as pigment dispersants, thickeners, fluidity improvers, defoamers, foam suppressors,
Release agents, foaming agents, penetrants, coloring dyes, coloring pigments, optical brighteners, ultraviolet absorbers, antioxidants, preservatives, antifungal agents, water resistance agents, wet paper strength enhancers, dry paper strength enhancers. Agents and the like can be blended appropriately.

The recording medium of the present invention can be used not only as an ink jet recording medium but also as any recording medium which uses a liquid ink during recording.
For example, an ink sheet that is formed by applying a heat-melting ink that contains heat-melting substances, dyes and pigments, etc., as a main component on a thin support such as resin film, high-density paper, or synthetic paper is heated from the back side to melt the ink. An image receiving sheet for thermal transfer recording that is transferred by transferring; an ink jet recording medium that heat-melts a heat-meltable ink to form fine droplets for flight recording; an ink jet recording medium that uses an ink in which an oil-soluble dye is dissolved in a solvent; photopolymerization type An image receiving sheet corresponding to a light and pressure sensitive donor sheet using microcapsules containing a monomer and colorless or colored dyes and pigments may be mentioned.

The common point of these recording media is that the ink is in a liquid state at the time of recording. The liquid ink permeates or spreads in the depth direction or the horizontal direction of the ink receiving layer of the recording medium before curing, solidifying or fixing. The various recording media described above require absorptivity according to their respective directions, and the recording medium of the present invention can also be used as the various recording media described above. Further, the ink jet recording medium of the present invention can be used as a recording medium for heat-fixing toner of an electrophotographic recording system which is widely used in copying machines, printers and the like.

The recording medium of the present invention can prevent the image density from lowering while maintaining its absorbability and color characteristics. In addition, the dot diameter of the heavy-colored dots is approximately the same as the dot diameter of the single-color dots, and the bleeding of the two colors is significantly reduced. Although the mechanism by which the dot diameter of this heavy-color dot becomes larger than that of the single-color dot is not clear, in the conventional recording medium using a porous inorganic pigment, for example, in the case of blue recording, magenta is recorded immediately after recording cyan. Although blue can be expressed by recording, magenta exudes in a concentric pattern around the blue, and the dot diameter is larger than that in the case of single-color recording. As a result, the hue of the recorded image is changed, the color reproducibility is deteriorated, and the resolution is deteriorated, so that the sharpness of the image is lacked and the quality of the recorded image is deteriorated. However, in the recording medium of the present invention, there is almost no bleeding in the second color of the heavy color portion.

Further, both the absorption speed and the image density could be significantly improved, which is the ratio of the pore volume per unit area of the ink receiving layer to the maximum ink discharge amount per unit area of one color. By specifying.

By setting the pore volume of the ink receiving layer to 50 to 150% of the maximum ink discharge amount per unit area of one color, an unexpected effect with respect to ink absorbency and dryness is exhibited, It is an improved one. Furthermore, the blocking resistance is also improved.

The ink jet recording suitability was measured by the following method.

1) Print Density The optical density of the recorded image which was solid-printed in black monochrome with an inkjet printer manufactured by Sharp (IO-720) was measured using a reflection densitometer (PAD-65 manufactured by Konica Corporation). The higher the number, the higher the concentration and the better.
For example, if it is 1.30 or more, it is sufficiently good.

2) Printing dot diameter With the above IO-720 printer, cyan ink single color,
With respect to dots obtained by printing halftone dots with a magenta ink single color and a cyan ink + magenta ink double color, the equivalent circle diameter of the dots was calculated according to the following calculation formula using an image analyzer.

HD = {(4 / π) × A} ^{1/2 In the} formula, HD is the equivalent circle diameter (Heywood Diameter).
er) and A indicate the measured area.

3) Double-color bleeding The quality was judged by how many times the double-color dot diameters of cyan ink and magenta ink were compared with the single-color dot diameter of magenta ink. The closer the value is to 1, the smaller the difference between the single color dots and the heavy color dots, and the better the image quality.

4) Ink Absorbability Using the IO-720 printer, the paper is fed immediately after the solid printing of the heavy color of red printing (magenta + yellow) (after about 1 second) and brought into contact with the finger, and the ink It was judged whether or not it was absorbed inside the receiving layer and did not adhere to the finger.し な い indicates no attachment, X indicates attachment, and Δ indicates the middle.

5) Blocking resistance After recording three colors of yellow, cyan and magenta in full dots, warm air (100 ° C., wind speed 1 m / sec) is applied to the recording surface for 1 time.
After applying for 0 seconds, a clear pocket (polypropylene film manufactured by Lion) with a pressure of 40 g / cm ^{2 on} the recorded image.
When the film was laminated, the film could be easily peeled, and the case where a considerable force was required for peeling was marked with X, and the middle thereof was marked with Δ.

6) Gloss (60 degree specular gloss) Deflection angle gloss meter (VGS-1) according to JIS-Z8741.
001DP: manufactured by Nippon Denshoku Industries Co., Ltd.). The 60-degree specular gloss of the image recording portion was measured for the black print portion.

7) Resolution A value obtained by the following formula by determining the line width of a single color (yellow recording portion and magenta recording portion) and the line width of a mixed color (blue recording portion) perpendicular to the head scan direction of the color pattern. About 200 μm or more, x is 199 to 100 μm
The case was evaluated as Δ, and the case of less than 100 μm was evaluated as ◯.

Resolution = Blue recording portion line width- (Yellow recording portion line width + Magenta recording portion line width) / 2

[0062]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the embodiments of the present invention are not limited thereto.

Example 1 A 100 g / m ² paper support was coated with polyethylene on both sides (however, the polyethylene layer on the ink receiving layer side contained 12% of titanium dioxide based on polyethylene), which was a dioxide of a reflection support. On the titanium-containing side, a gelatin subbing layer having a thickness of 0.1 μm was applied, and the following ink-receiving layer coating liquid was applied thereon to prepare an inkjet recording medium.

The amount of each material used is the amount per 1 m ² of the recording medium, “%” means “% by weight”, and “part” means “part by weight”.

Dodecylbenzene was added to 90 parts of an ink receiving layer coating liquid alumina sol (alumina sol-100: Nissan Chemical Industries, Ltd., solid content 10%, aqueous dispersion colloidal solution of cationic alumina hydrate having an amorphous crystal form). 5 cc of sulfonic acid was added, and ultrasonic dispersion was applied for 20 minutes. To this dispersion, a 10% aqueous solution of carboxylic acid-modified polyvinyl alcohol (KL-318: manufactured by Kuraray Co., Ltd.) 1
When 0 parts were mixed and these complexes were formed to form a solution and gelled, 100 parts of water was added and vigorously stirred at 65 ° C. for several tens of minutes to obtain a dispersion solution of the complex as a coating liquid. .

Recording medium sample 1 was prepared by coating the above ink-receiving layer coating liquid on the support by a bar coater method so that the dry film thickness was 30 μm, and drying at 110 ° C. for 5 minutes.
I got

Sample 1 had a pore volume of 5.2 cc / m ² and an average pore diameter of 67Å.

The maximum ink amount was printed on Sample 1 at 720 dpi by changing the mode of the printer head as shown in Table 1 (Experiment Nos. 1-1 to 1-4).

[0069]

[Table 1]

Table 2 shows each characteristic in each printing.

[0071]

[Table 2]

Example 2 The following coating liquid for ink receiving layer was prepared.

Ink-receiving layer coating liquid A glass reactor having a volume of 3000 cc was charged with 760 cc of water and i.
-Propyl alcohol 440 cc was mixed and added, and when the liquid temperature was raised to and stabilized at 68 ° C, 412 g of tetraethoxysilane was added over time while stirring. 8
It was hydrolyzed at 0 to 85 ° C for 12 hours. However, the diffusion speed at this time was always kept constant.

Then, the temperature was raised to 95 ° C., and sulfuric acid was added to 10.3.
g was added, the mixture was deflocculated at 85 ° C. for 55 hours (at this time, ultrasonic dispersion was slightly applied), and concentrated to 1000 g to obtain a white silica sol.

To 90 parts of the above silica sol, 3 cc of dodecylbenzenesulfonic acid was added, and ultrasonic dispersion was applied for 15 minutes.
To this dispersion, 10 parts of a 10% aqueous solution of polyvinyl alcohol (KL-117: manufactured by Kuraray Co., Ltd.) was mixed, and when these complexes were formed to form a solution and gel, 100 parts of water was added to 65 ° C. The mixture was vigorously stirred for several tens of minutes to obtain a dispersion solution of the complex as a coating liquid.

On the same support as in Example 1, the above-mentioned coating liquid for ink receiving layer was applied by a bar coater method so that the dry film thickness was 30 μm, and dried at 110 ° C. for 5 minutes to prepare recording medium sample 2. Got

Recording medium sample 3 was obtained in the same manner as sample 2 except that the same coating liquid as sample 2 was used and the dry film thickness was adjusted to 50 μm.

The pore volumes of Samples 2 and 3 were 8.
8 cc / m ² , 14.7 cc / m ² , and the average pore diameter is 5
It was 5Å.

As in Example 1, samples 720 and 720 were used.
The maximum ink amount in dpi was printed by changing the mode of the printer head as shown in Table 3 (Experiment No. 2-1).
~ 2-5, No. 3-1 to 3-4).

[0080]

[Table 3]

Table 4 shows each characteristic in each printing.

Even if the pore volume / maximum ink discharge amount is within the range of the present invention, the resolution is deteriorated when the thickness of the ink receiving layer exceeds 30 μm.

[0083]

[Table 4]

[0084]

As is clear from the examples, according to the ink jet recording method of the present invention, ink receptivity (water absorption), drying property, image density and sharpness are excellent, blocking, heavy color bleeding, etc. It is possible to obtain a high quality image with high quality.

Claims (4)

[Claims] 1. An ink jet recording medium having at least one or more ink receiving layers provided on a support, wherein the pore volume per unit area of the ink receiving layer is the maximum ink discharge amount per unit area of one color. 50 to 150% of the above. 2. The film thickness of the ink receiving layer is 5 to 30 μm.
The inkjet recording method according to claim 1, wherein 3. The average pore diameter of the ink receiving layer is 40 to
The ink jet recording method according to claim 1, wherein the ink jet recording method is 200Å. 4. The thickness of the ink receiving layer is 5 to 30 μm.
The inkjet recording method according to claim 3, wherein