JPH1148601A - Method for manufacturing ink jet recording medium - Google Patents

Abstract

(57) [Problem] To provide an ink jet recording paper excellent in coloring and ink absorption. In a method of manufacturing an ink jet recording sheet provided with an ink-receiving coating layer containing a pigment and a resin on a support, infrared rays are used as drying means for the ink-receiving coating layer in a wet state. A method for producing an ink jet recording paper. The pigment contains finely powdered synthetic silica, and the ratio of the peak area of silicon electron 2P to carbon atom 1S (C _1S / Si _2P ) measured on the surface of the ink receptive coating layer by X-ray photoelectron spectroscopy is 3.0 to 30. 2.0. The method for producing an ink jet recording sheet according to the above, wherein

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 material used for a printer, a plotter or the like using an aqueous ink, and particularly capable of recording an image having excellent color development, dot shape, and other characteristics. The present invention relates to an ink jet recording medium having a very high print density and excellent ink absorbability.

[0002]

2. Description of the Related Art The performance of ink-jet type printers using water-based inks and improvements in inks have made it possible to obtain clear images and print quality using plain paper as ink-jet paper. However, on the other hand, in order to make the print quality, saturation, appearance, and image more attractive, a recording material having more advanced characteristics has been required. In particular, due to improvements in printing speed, resolution, saturation, etc., more advanced characteristics such as high-speed absorption, high absorption capacity, regular ink bleeding, etc. are required for recording materials, and ink receptivity A so-called coated paper provided with a coating layer on the surface has been developed. For example, Japanese Patent Application Laid-Open No. 62-158084 discloses a method for producing an ink jet recording medium having high aqueous ink absorbency, color reproducibility and color density using fine-particle synthetic silica.
That is, in order to meet the above-mentioned required characteristics, it is usually practiced to provide a coating layer mainly composed of a white pigment excellent in liquid absorbing property such as fine particle synthetic silica on the surface of a base paper mainly composed of cellulose pulp. Have been. In particular, fine coating / base paper absorbing type inkjet paper is well-balanced in cost, hand and performance, and is expected to increase demand in the future. Ink-jet paper of uncoated type or lightly coated / base paper absorption type has good ink absorbency, and the ink is absorbed inside the paper layer and becomes apparently dry. Two performances are required that no strikethrough occurs due to the aqueous ink. These two conditions are generally inconsistent and cause a problem because the more ink-absorbing paper, the greater the strike-through due to the aqueous ink.

[0003] For example, if the absorption speed is increased using low-size paper, the penetration of the ink becomes faster, and the ink penetrates deeply to cause strikethrough. On the other hand, in high-size uncoated paper or finely-coated paper in which an absorbent coating layer is provided on a high-size base paper, it is possible to increase the absorption speed of only the absorption layer and suppress ink absorption into the base paper. it can. However, if the absorption layer exceeds the limit of the ink absorption capacity, the base paper cannot absorb the ink, causing image defects such as bleeding. There are problems such as clogging of the printer head due to peeling off and an increase in cost.

[0004] Ink-jet recording has features such as low noise, high-speed printing, low running cost, and easy color recording. In addition, due to the explosion of personal computers in recent years, ink-jet printers with low hardware prices have become less popular. And for hard copy of image information. Recently, the use of hard copy of multimedia color information on paper and the printing of high-quality images comparable to silver halide photographs have been spreading with the spread of digital cameras, and the number of hard copies is expected to increase further. ing. By further improving the hardware, the density of normal cyan and magenta inks called photo inks is reduced by two to three times to normal four-color inks (black, cyan, magenta, and yellow) to three tones from the previous two tones. Printers equipped with inks that can express images have also appeared, and images are becoming more detailed and closer to photographs. Further, as the image approaches a photograph, a more vivid and higher-density image is required.

When an attempt is made to increase the print density using photo ink, it is necessary to increase the ink ejection amount because the ink density is low. Therefore, if the ink absorbency of the paper is insufficient, bleeding or the like is likely to occur. Conversely, if the ink ejection amount is suppressed, there is a problem that the print density is not sufficiently obtained.
JP-A-63-170075 discloses that the drying conditions of the coating layer are such that the temperature gradient is 20 ° C. or higher and the maximum drying temperature is 120-200 ° C.
An ink jet recording paper having a temperature of 150 ° C. is disclosed. Such a method is effective for preventing cracks and the like of a coating layer, but is insufficient to satisfy the above requirements.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and provides a high-quality ink jet recording having high print density, high ink absorbency and high resolution when printing using an ink jet printer. The purpose is to provide paper.

[0007]

The present invention includes the following aspects. [1] In a method for producing an ink jet recording medium provided with an ink receptive coating layer containing a pigment and a resin on a support,
A method for producing an ink jet recording material, comprising drying an ink-receiving coating layer in a wet state using infrared rays. [2] The pigment contains finely powdered synthetic silica, and has carbon atoms 1 measured by X-ray photoelectron spectroscopy on the surface of the ink-receiving coating layer.
Ratio of peak area of silicon electron 2P to S (C _1S / Si
_2P ) is 3.0 to 30.0 [1]
The method for producing an ink jet recording medium according to the above. [3] The method for producing an ink jet recording medium according to [1] or [2], wherein the ink receptive coating layer contains finely powdered synthetic silica, silanolated polyvinyl alcohol-based resin, and cationic resin.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As a method for drying an ink receptive coating layer, there have hitherto been used steam heating, hot air heating, drum heating and the like. In these drying methods, only the drying of the surface portion of the coating layer is preceded. However, uniform drying (particularly drying in the Z-axis direction) over the entire coating layer is not performed, and as a result, drying unevenness and binder migration occur, resulting in printing unevenness during printing. Printing unevenness, that is, image non-uniformity,
This contributes to lowering the print density. However, in the drying method using infrared rays, drying of the coating layer in the Z-axis direction becomes uniform and a bulky coating layer is obtained, so that the ink absorbency is improved and an image without bleeding is obtained. In addition, when infrared drying is used, the occurrence of binder migration can be suppressed, and as a result, the proportion of the pigment content on the surface of the coating layer increases, which is considered to contribute to the print density. In the present invention, a resin is used to fix the pigment in the coating layer.However, some resins do not contribute to ink absorbency depending on the type of the resin, and when such a resin is used, only the resin portion is applied to the ink. It is considered that dyeing does not occur and the area of the dyed portion is reduced, which eventually results in a decrease in print density.

Further, the present inventors have proposed a pigment and resin ink.
Regarding the abundance ratio on the surface of the receptive coating layer,
It was studied using electron spectroscopy. In X-ray electron spectroscopy, the elements
Is irradiated with X-rays, and the unique free electrons emitted from the elements
Kinetic energy is measured quantitatively and qualitatively. this
In the method, about 3 to 50 Å below the surface of the coating layer
Only the constituent elements of the coating layer can be measured.
Cannot be measured (Surface Analysis Picture Book: Japan Surface Science)
Association, Society Press Center, P.K. 124-P. 125 X-ray
See photoelectron spectroscopy). In the present invention, preferably,
Using silica-based pigments such as Rica, but using X-ray photoelectron spectroscopy
Analyze the surface of the ink receptive coating layer using
C derived from _1SPeaks and derived from finely powdered synthetic silica
Si_2PPeak area ratio C_1S/ Si_2PBy calculating
Calculate the index of the ratio of pigment and resin on the surface of the ink receiving layer
It is possible. In the present invention, the peak area ratio C_1S
/ Si_2PIs preferably 3.0 to 30.0, more preferably
Is from 6 to 25. When the peak area ratio is less than 3.0
Indicates that the pigment ratio on the surface of the ink-receiving coating layer increases and
Although the concentration improves, the resin ratio on the surface of the coating layer decreases.
The surface of the coating layer becomes weaker,
It is not suitable because it affects the running performance of the center. On the other hand,
If the surface area ratio is large, the resin ratio on the coating layer surface increases
Then, the place where the ink is not absorbed appears, and as a result,
Since the unstained portion occurs, the print density is reduced.
Wake up. Especially when it exceeds 30.0, the unabsorbed portion of the ink
Extremely increased, resulting in uneven ink absorption and reduced image quality
Therefore, it is not suitable.

[0010] In order to obtain infrared radiant energy, there are a method of directly obtaining from a heat source and a method of generating effective infrared radiation therefrom through a heat medium. Infrared rays are emitted from an object due to vibration waves of lines of electromagnetic force that depend on molecular motion, and its generation mechanism includes cold radiation and heat radiation. Cold radiation is radiant energy generated when gas atoms and molecules are impacted by ionization or collisional excitation due to discharge or the like in a closed vessel containing a low-pressure gas, such as discharge lamps of mercury, xenon, cesium, sodium, etc., and carbon dioxide gas lasers. There is. Heat radiation, on the other hand, is when the atoms and molecules that make up an object absorb energy,
Alternatively, it is energy radiated from molecules and atoms excited by heat generated by the chemical reaction, electric resistance, friction, and the like. Thermal radiation includes solids and gases, and their spectra also differ. Platinum as a source of heating radiation for solids,
Electrical resistors such as tungsten, nichrome, and kanthal are often used, and there are various types depending on the application, such as a bulb shape or heating directly in air. In addition, since the radiation efficiency is poor when the above-mentioned metal is directly heated, there is a method in which infrared rays are radiated through a ceramic heat medium in recent years. As an infrared radiation device, a halogen lamp using tungsten as a filament is useful. Halogen lamps have advantages such as good thermal efficiency and quick start-up.

As the infrared heating system used in the present invention, those described above can be used. A gas heater or the like that emits infrared light can also be an object of the present invention. Infrared rays are 2.5μm or less depending on the wavelength, near infrared rays, 2.5-25μm.
m is classified as (middle) infrared ray, and 25 μm or more is classified as far infrared ray. In the present invention, since the moisture in the paint applied to the paper is dried using infrared rays, an infrared wavelength matching the infrared absorption of water is desirable. When the infrared absorption spectrum of the water molecule is measured, the fundamental vibration of expansion and contraction is about 3642 / cm, and the wavelength is 2.7 μm. Can be dried. However, since pigments, resins, and the like actually exist in the coating material in addition to water, their absorption wavelengths should be considered. In the present invention, in addition to the above-described infrared heating, conventionally known steam heating, hot air heating, drum heating, electric heater heating, laser heating, electron beam heating, and the like can be used in combination. In this case, an infrared heating method is used in the initial stage of drying, and the method is used after the fluidity of the coating layer is reduced and the movement of moisture is sufficiently performed. For example, it is used for adjusting the moisture content of paper.

The support of the present invention is a paper, a resin film (including a paper having a resin laminated on the surface), a synthetic paper (a thermoplastic resin containing a filler such as an inorganic pigment or the like and drawn into a paper shape). Are used. Pulp materials contained in paper include Akamatsu, Kuromatsu, Ezomatsu, Todomatsu,
It is appropriately selected from conifers such as cedar, groundwood pulp, sulfite pulp, kraft pulp, semi-chemical pulp, semi-chemical pulp, chemical ground pulp, refiner ground pulp and waste paper pulp mainly using broadleaf trees such as beech, hippopotamus, and shionoki. . The paper used as the support of the present invention includes inorganic pigments such as clay, talc, calcium carbonate, calcined kaolin, aluminum oxide, aluminum hydroxide, and titanium oxide, and urea resin-based fine particles in addition to the wood pulp described above. And organic additives such as rosin, alkyl ketene dimer, alkenyl succinic acid, etc., fixing agents such as sulfate band, cationic starch, polyacrylamide polymer, starch, etc. A base paper made by appropriately selecting an agent and the like and internally adding the same to a known paper machine is suitably used. If necessary, rosin-based, petroleum resin-based, oxidized starch, acetylated starch, starch such as hydroxyethylated starch and derivatives thereof, polyvinyl alcohol and derivatives thereof, styrene, alkyd, polyamide, acrylic, olefin, maleic acid,
Synthetic resin systems comprising a polymer such as vinyl acetate or two or more copolymers and these synthetic resin emulsion systems,
The sizing treatment may be performed with a surface sizing agent such as a wax. Examples of the paper include acid paper and neutral paper. Further, in order to adjust the thickness and the smoothness, known equipment such as a machine calendar and a super calendar may be used as necessary.

The resin film used for the support in the present invention may be a thermoplastic resin such as polyester resin and olefin resin. As polyester resin,
Examples of polyethylene terephthalate, polybutylene terephthalate, polycyclohexene terephthalate, and the like, and examples of olefin resins include those composed of polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer, and those containing these as main components. it can. One or more of these thermoplastic resins can be appropriately selected and used, and a mixture of polystyrene, an acrylate copolymer, or the like can be used as another thermoplastic resin. A film formed by stretching these thermoplastic resins in the machine direction and / or the transverse direction can also be used. In addition, a film is formed by mixing inorganic fine powder in this thermoplastic resin,
This may be biaxially stretched, for example, to form a paper-like layer.
In the present invention, a multilayer film obtained by laminating a plurality of such films is used as a support, for example, a base layer and a two- or three-layer film provided with a paper-like layer on both sides or one side, or Further, a three- to five-layer film having a surface layer formed on at least one side of a paper-like layer may be used. What made a thermoplastic resin into a paper-like layer is generally known as synthetic paper. The opacity of such a film is not particularly limited in the present invention.

The pigment used in the ink receptive coating layer is preferably made of a material which is porous, has high ink absorbency, and enables clear color development. As such a pigment, fine powder synthetic silica is particularly preferred. Finely divided synthetic silica is roughly classified into a wet method and a dry method according to its production method. The wet method is obtained by using sodium silicate as a raw material and neutralizing with an acid to precipitate silica. The wet method is further divided into a precipitation method and a gelation method. Further, in the dry method, it is obtained by burning silicon tetrachloride as a raw material together with hydrogen and oxygen to precipitate silica. The finely divided synthetic silica used in the present invention has an average particle size of 0.5 to
15 μm is preferred. When the particle diameter is out of this range, the dot shape of the recorded ink may be deteriorated when printing on the paper. For the purpose of absorbing ink, it is desirable that the synthetic silica has a high oil absorption.
It is preferably at least 00 ml / 100 g. If the amount of oil absorption is out of this range, the ink absorption capacity becomes insufficient and the image quality deteriorates. Further, other white pigments can be used in combination according to the purpose of use of the sheet and the required performance of the printer. These white pigments include colloidal silica, precipitated calcium carbonate, heavy calcium carbonate, calcium silicate, aluminum hydroxide, zeolite, calcined clay,
Pigments generally used for paper coating, such as kaolin clay, talc, white carbon, and organic pigments (plastic pigments, urea resins), may be mentioned.

The usage ratio of such a white pigment is not particularly limited, but is preferably from 50 to 90% by weight of the total solid content of the coating layer. If the amount is small, the ink absorbency becomes insufficient in many cases, and if the amount is large, the strength of the ink receptive coating layer may be reduced, which is not preferable. Examples of the resin used in the ink-receiving coating layer of the present invention include polyvinyl alcohol and polyvinyl alcohol derivatives modified with silanol groups, proteins such as polyvinyl pyrrolidone and casein, derivatives such as starch and oxidized starch, and styrene-butadiene copolymer. Copolymers, conjugated diene polymer latex such as methyl methacrylate-butadiene copolymer, acrylic polymer latex such as acrylate and methacrylate polymer or copolymer, and vinyl such as ethylene-vinyl acetate copolymer -Based polymer latex, or a modified polymer latex containing functional groups such as carboxyl groups and cationic groups of these various polymers, synthetic resin-based aqueous adhesives such as thermosetting resins such as melamine resins and urea resins, and maleic anhydride. Acid copolymer resin, polyacrylamide Polymers such as polymethyl methacrylate, polyurethane resin, unsaturated polyester resin, polyvinyl butyral, alkyd resin and other synthetic resin adhesives have good adhesion to pigments in the ink-receiving coating layer. It is preferably used because it has good affinity with water-based ink and improves liquid absorption.

Particularly, as the resin of the present invention, a polyvinyl alcohol derivative modified with a silanol group is preferable.
Silanolated polyvinyl alcohol is obtained by copolymerizing a silicon-containing vinyl compound with vinyl acetate and then saponifying the vinyl acetate unit into vinyl alcohol, and the silicon-containing monomer unit into silanol groups. (JP-A-58-59203). Silanolated polyvinyl alcohol specifically and firmly binds to inorganic pigments such as finely powdered synthetic silica, so that it is possible to achieve sufficient coating strength with a small amount that does not hinder color development and resolution. Further, depending on the purpose, it is also possible to use the above various resins in combination with silanolated polyvinyl alcohol. When using the infrared drying of the present invention, it is particularly preferable to use silanolated polyvinyl alcohol as the resin. Silanolated polyvinyl alcohol has excellent adhesion to finely powdered synthetic silica,
Although sufficient adhesiveness can be obtained even with a small amount, the dye itself does not contribute to ink absorption and is not dyed. Therefore, when a large amount is present on the surface of the coating layer, the print density is reduced. The proportion of the resin used in the ink receptive coating layer is not limited either, but is preferably 10 to 50% by weight, preferably 10 to 4% by weight of the total solid content of the coating layer.
0% by weight. If the amount is small, the adhesive strength becomes insufficient, and there is a concern that the strength of the coating layer may be reduced. On the other hand, although the adhesion is increased at most, it is unsuitable because the use ratio of the pigment is reduced and the problem of the ink absorbability occurs as described above.

The cationic resin used in the ink-receiving coating layer of the present invention includes polyethyleneimine, polyvinylpyridine, polydialkylaminoethyl methacrylate, polydialkylaminoethyl acrylate, polydialkylaminoethyl methacrylamide, polydialkylaminoethyl acrylamide. And compounds such as polyepoxyamine, polyamidoamine, dicyandiamide-formalin condensate, dicyandiamide-polyalkylenepolyamine condensate, polydimethyldiallylammonium chloride, polyvinylamine, polyallylamine, and modified products thereof. The proportion of the cationic resin used in the ink-receiving coating layer is preferably 1 to 30% by weight based on the total solid content of the coating layer. If the amount is too small, the effect of improving the fixability of the ink dye is insufficient, and the water resistance of the ink is not sufficiently improved. On the other hand, although the fixability of the ink is improved at most, problems such as fading due to light and discoloration of paper may occur. In addition, as additives, pigment dispersants, defoamers, colorants, antioxidants, ultraviolet absorbers, viscosity modifiers,
A cross-linking agent or the like is appropriately used according to the manufacturing conditions, printing quality, and required performance. Known coating equipment such as a bar coater, an air knife coater, a blade coater, and a gravure coater is applied for coating of the paint used for the ink receptive coating layer of the present invention. A sheet provided with an ink receptive coating layer on a base paper can be used as it is as the recording paper of the present invention, but it can be treated with, for example, a super calender, a gloss calender, etc. to impart surface smoothness. It is.

The coating amount of the ink-absorbing coating layer obtained in the present invention is determined by the final use, and does not need to be increased unnecessarily as long as the ink-absorbing property, recording characteristics, storability and the like are satisfied. For example, it is appropriately selected from the range of 1 to ²⁰ g / m ² and used. If the ink-receptive coating layer is small, the ink absorption capacity is often insufficient, causing the image to flow out, causing color blurring, blurring the image, drying slowly, and causing the ink to be discharged onto the paper discharge roll of the printer. Adheres and becomes dirty. In addition, since the amount of ink absorbed by the base paper increases, there is a problem that curling and unevenness are likely to occur. However, at most, a thick coating layer weakens the adhesiveness to paper, and often causes a problem such as clogging of a head nozzle due to a peeled-off coating layer, which is also expensive. Becomes

[0019]

EXAMPLES The present invention will be described more specifically with reference to the following examples, but it should be understood that the present invention is not limited by these examples. In the following, parts and% all indicate parts by weight and% by weight. Example 1 10 parts of light calcium carbonate was washed with hardwood bleached kraft pulp 9
0 parts and 10 parts of softwood bleached kraft pulp were added to the slurry, 0.3 part of carotin starch and 0.02 part of alkenyl succinic anhydride-based neutral sizing agent were added, and mixed well to obtain a papermaking raw material. Moisture is reduced to 10 using a multi-cylinder paper machine.
%, A 1% solution of oxidized starch is applied by a size press, dried, and dried to a moisture content of 7%.
^Two base papers were produced. One side of the obtained base paper was coated with paint-1 at a rate of 9 g / m ^{2 on} a table in a laboratory,
The coating layer was formed by drying for 1 minute using an infrared irradiation apparatus (Heatc Co., Ltd., heat module, wavelength 2.6 μm) to form an ink jet recording paper. Paint-1 Fine powder synthetic silica (Fine Seal X-37, manufactured by Tokuyama, particle size 2.6 μm, oil absorption 275 ml / 100 g) 7
5 parts, polyvinyl alcohol (117: Kuraray) 1
5 parts, starch (Ace A: manufactured by Oji Cornstarch) 5 parts,
5 parts of polydiallyldimethylammonium chloride-based cation resin (PAS-H-5L: manufactured by Nitto Boseki)

Example 2 One surface of the base paper used in Example 1 was coated with 1 paint-2 on a table.
Coating was performed at a rate of 0 g / m ² and dried using the infrared irradiation device used in Example 1 to form a coating layer. In the same manner as in Example 1, an ink jet recording paper was manufactured. Paint-2 Fine particle synthetic silica (Carplex BS-304F: Shionogi & Co., Ltd., particle size 4.1 μm, oil absorption 188 ml / 10
0g) 70 parts, silanolated polyvinyl alcohol (R
-1130: Kuraray) 25 parts, polydiallyldimethylammonium chloride-based cationic resin (PAS-H-
5L: Nitto Boseki) 5 parts

Example 3 An ink jet recording sheet was manufactured in the same manner as in Example 1 except that Paint-1 was changed to Paint-3. Paint-3 Calcium carbonate (short diameter 0.1-0.3 μm, long diameter 1.5
~ 2.5μm, oil absorption 120 ~ 135ml / 100g,
75 parts of Tamapearl TP-123: manufactured by Okutama Industry, 15 parts of polyvinyl alcohol (117: manufactured by Kuraray), 5 parts of starch (Ace A: manufactured by Oji Cornstarch), polydiallyldimethylammonium chloride-based cation resin (P
AS-H-5L: Nitto Boseki) 5 parts

Comparative Example 1 Paint-2 was applied on one side of the base paper obtained in Example 1 on a table at a rate of 10 g / m ² , and a hot air drier (MLC-100L manufactured by Ausugi Co., Ltd.) was used. The coating was dried with hot air at a temperature of 120 ° C. and a wind speed of 35 m / s for 1 minute to form a coating layer, thereby producing an inkjet recording paper. Table 1 shows the evaluation results of these coated papers. The following method was used to evaluate the ink jet recording characteristics. Inkjet printer (BJ
C-420J: manufactured by Canon Inc.)
The print density was measured. In the evaluation of the ink absorbency, the number of seconds until the printed ink dries and the gloss of the ink disappears is measured.以下 indicates 5 seconds or less, Δ indicates 6 to 10 seconds, and X indicates 11 seconds or more. Print density is yellow,
The density of portions printed with solid inks of magenta, cyan, and black inks was evaluated with a Macbeth densitometer. For printing unevenness, a 70% halftone of blue was printed, and the nonuniformity of the image was visually evaluated. A uniform sample was evaluated as ○, and an uneven sample was evaluated as ×. The peak area ratio C _1S / Si _2P is made by JEOL JPS-
At 80, the diameter is 6 mm under the conditions of an acceleration voltage of an X-ray source of 10 kv and an emission power supply of 10 mA (vacuum degree: 5 × 10 −8 mBar, measurement range of binding energy: 0 to 500 eV).
Of the sample surface was measured. The area of the obtained peak was determined by a half-width method (a method of multiplying the height of the peak by the half-width of the intensity curve to obtain a peak area approximately as a triangle), and the area ratio was calculated.

[0023]

[Table 1]

As can be seen from Table 1, the ink jet recording sheets obtained in the examples are very excellent in all of ink absorbency, print density and print unevenness. However, the ink jet recording sheet obtained from the comparative example was inferior in all of the ink absorbency, print density, and print unevenness, and was clearly inferior even in comparison using the same pigment.

[0025]

The recording paper of the ink jet printer according to the present invention has an effect of being excellent in ink absorbency and color development.

Claims (3)

[Claims] 1. A method for producing an ink jet recording material having an ink receptive coating layer containing a pigment and a resin provided on a support, wherein the wet ink receptive coating layer is dried using infrared rays. A method for manufacturing an ink jet recording medium. 2. The pigment contains finely powdered synthetic silica, and the ratio of the peak area (C _1S) of silicon electron 2P to carbon atom 1S measured on the surface of the ink receiving coating layer by X-ray photoelectron spectroscopy.
/ Si _2P) are provided methods for producing the ink jet recording material according to claim 1, wherein it is 3.0 to 30.0. 3. The method according to claim 1, wherein said ink receptive coating layer contains finely powdered synthetic silica, silanolized polyvinyl alcohol-based resin, and cationic resin.