JP2003341225A - Ink jet recording material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink jet recording material of which an ink accepting layer on one side is highly glossy and scratch resistant while the other side is high in ink-absorbing, low in ink bleeding, highly suitable for script and good in feeding despite a continuous printing of numerous copies. <P>SOLUTION: The ink jet recording material which has the ink accepting layer comprising inorganic particulates having average primary particle size of 100 nm or smaller and a hydrophilic binder on one face of a water resistant base. On the other face, there are provided an outermost layer most remote from the water resistant base which comprises inorganic particulates having average particle size of 1 to 10 μm and a polyvinylalcohol compound, an intermediate layer which comprises inorganic particulates having average particle size of larger than 0.1 μm and smaller than 1 μm and the hydrophilic binder and, a lower layer which comprises inorganic particulates having average particle size of 100 nm or smaller and the hydrophilic binder. <P>COPYRIGHT: (C)2004,JPO

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 having ink receiving layers on both sides, and more particularly, one side has high gloss and photo-like image quality, and when continuously printed by a printer. Is not scratched easily, the other side has writability, there are no surface defects during application, there is little ink bleeding when printing, and it is easy to transport even when printing a large number of consecutive sheets with a printer. The present invention relates to an ink jet recording material which has good quality and can be used for postcards.

[0002]

2. Description of the Related Art As a recording material used in an ink jet recording method, a pigment called amorphous silica or the like is formed on a support called ordinary paper or ink jet recording paper, and a porous material made of a water-soluble binder such as polyvinyl alcohol is used. A recording material provided with the ink absorption layer is known.

For example, JP-A-55-51583 and JP-A-5-51583.
No. 6-157, No. 57-107879, No. 57-10.
No. 7880, No. 59-230787, No. 62-160.
No. 277, No. 62-184879, No. 62-1833.
No. 82 and No. 64-11877, there are proposed recording materials obtained by coating a paper support with a silicon-containing pigment such as silica together with an aqueous binder.

Further, Japanese Patent Publication No. 3-56552 and Japanese Patent Laid-Open No. Hei 2
-188287, 10-81064, 10
-119423, Dohei 10-175365, Dohei 1
0-193776, 10-203006, 10
-217601, Dohei 11-20300, Dohei 11
Nos. -20306 and 11-34481 disclose the use of synthetic silica fine particles prepared by a vapor phase method (hereinafter referred to as vapor phase silica). The vapor-phase method silica is an ultrafine particle having an average primary particle diameter of several nm to several tens of nm, and is characterized by high gloss.
However, since they are ultrafine particles, scratches are likely to occur on the surface of the ink receiving layer, and the problem of double feeding during transportation by a printer,
In addition, there are problems that slippage occurs when the printed sheets are stacked and aligned, and scratches occur in the printing portion when the printed sheets are stacked and transported.

Japanese Unexamined Patent Publication (Kokai) No. 6-55830 proposes a recording paper containing a specific lubricant on the surface opposite to the ink-receptive coating layer to improve the transportability of the printer. And the problem of scratches on the ink receiving surface have not been solved. In addition, Japanese Patent Laid-Open No. 7-1790
No. 25, there is proposed a recording sheet in which a spherical fine particle polymer is contained in a backing layer of a support. However, the spherical fine particle polymer alone is inferior in ink absorbency, and at the time of production,
The occurrence of scratches on the surface of the ink receiving layer during processing is not eliminated, and the problem that scratches are apt to be noticeable on the printed portion particularly when fine inorganic fine particles are used for the ink receiving layer cannot be solved.

On the other hand, conventionally, paper has been generally used as a support for the ink jet recording material, and the paper itself has a role as an ink absorbing layer. In recent years, as photo-like recording sheets have been demanded, recording sheets using a paper support have problems such as gloss, texture, water resistance, cockling (wrinkles or waviness) after printing, and are treated with water resistance. Further, a paper support such as a polyolefin resin-coated paper obtained by laminating a polyolefin resin such as polyethylene on paper, a plastic film or the like has come to be used. However, unlike the paper support, these water-resistant supports have a high smoothness on the surface provided with the ink receiving layer, and when they are overlapped with the back surface, scratches easily occur on the ink receiving surface due to rubbing, and the printed sheet When the sheets are stacked and transported, scratches are likely to occur on the printed part. Further, there is a problem that double feeding or idling is likely to occur during inkjet printing, and slipping is difficult when the printed sheets are stacked and aligned. In particular, double-sided printing was likely to cause double feeding when printing later.

In particular, both sides have ink jet recording suitability such as a postcard, and the surface has high photo-like glossiness,
When printing image quality is required, it is difficult to improve the transportability and scratch resistance on the surface because there is a limitation due to the decrease in glossiness.The surface is opposite after printing on the ink receiving layer surface with high glossiness. When printing on the surface of the ink receiving layer, the transportability deteriorates, and there arises a problem that blank feeding or double feeding occurs.
Japanese Unexamined Patent Publication (Kokai) No. 8-260382 proposes a double-sided recording paper for inkjet recording in which a pigment layer is provided on a paper base material, but sufficient glossiness and a printed image cannot be obtained. JP-A-8-11422 proposes to bond a base paper having an ink receiving layer with a polyolefin resin laminate layer, but there is a concern that scratches may occur at the time of bonding, particularly in the case of having a high gloss ink receiving layer. However, the transportability and scratch resistance of the printer were not sufficient. JP 2000-
No. 301823 proposes an inkjet recording paper having a porous ink absorption layer on one surface of a paper base material with a relatively thin hydrophobic resin layer interposed therebetween and an ink absorption layer directly on the other surface. However, as a preferred embodiment, there is a description that a matting agent having an average particle size of 5 μm or more is contained in a porous ink absorbing layer, but the glossiness is greatly reduced to obtain sufficient scratch resistance, and the opposite surface after printing on one side The problem of deterioration in transportability such as double feeding and idling that occurs when printing on paper has not been solved.

Further, as disclosed in JP-A-11-301095 and JP-A-11-301106, double-sided printable ink jet recording papers such as those to which papers are stuck or ink-receiving layers are provided on both sides are available. Proposed. Inkjet recording paper that can be printed on both sides is sometimes used as a postcard or card, and a glossy surface requires a high-quality image equivalent to a photograph. On the other hand, the back coat surface is required to have writability such as a pencil, a mechanical pencil, a ballpoint pen, and a fountain pen, and also to be printable with an inkjet. In addition, water resistance against rainwater is also required. Further, when printing as postcards, printing is often performed with a set number of sheets, and there are problems such as transportability in the printer and powder falling off of the coating layer. In particular, in the case of a recording material using a water-resistant support, when a large number of sheets are continuously printed on the back coat surface to which writability is imparted, there is a problem that the conveyance roller and the recording material slip and printing becomes impossible. All of the above problems cannot be satisfied with the above-mentioned paper stuck together or the ink-receiving layer provided on both sides.

[0009]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a photo-like image quality and a good tactile sensation with a high gloss on one side of the ink receiving layer and a good scratch resistance, and a high ink on the other side. It has absorptivity, little bleeding when printed in color, the strength of the coating layer is high, it has high writing properties, and there is no problem in transportability even when printing a large number of sheets in succession. An object of the present invention is to provide an inkjet recording material that does not have a problem of transportability such as double feeding when printing on both sides even when printing on both sides.

[0010]

In order to solve the problems, the present inventors have found that, among the above-mentioned problems, poor transportability when a large number of ink-jet prints are continuously made on the back ink-receptive layer having writability is due to the inorganic substance from the ink-receptive layer. It has been found that scraps of a rubber-like substance that constitutes the conveying roller together with the fine particle powder are generated by adhering to the roller, and that other problems are mainly solved by the following means.

(1) At least one ink receiving layer A (hereinafter referred to as "table ink receiving layer") containing inorganic fine particles having an average primary particle size of 100 nm or less and a hydrophilic binder on one surface of a water-resistant support. ) And two or more ink receiving layers B are provided on the other surface of the ink-jet recording material, the uppermost layer B2 farthest from the water-resistant support of the ink receiving layer B (hereinafter referred to as “the backmost ink receiving layer The upper layer) contains at least one kind of inorganic fine particles having an average particle size of 1 to 10 μm, a polyvinyl alcohol compound, and spherical organic particles having an average particle size larger than that of the inorganic fine particles contained, and a water-resistant support. The lower layer B1 (hereinafter referred to as "the lower layer of the back ink receiving layer") having a mean primary particle size of 10
An inkjet recording material comprising inorganic fine particles of 0 nm or less and a hydrophilic binder.

(2) At least one ink-receiving layer C containing inorganic fine particles having an average primary particle size of 100 nm or less and a hydrophilic binder on one surface of the water-resistant support (hereinafter referred to as "table ink-receiving layer"). ) Is provided, and the ink-jet recording material having three or more ink-receiving layers D on the other side is the furthest from the water-resistant support of the ink-receiving layer D (hereinafter referred to as “back-side ink-receiving layer”). The uppermost layer D3 (hereinafter referred to as "uppermost layer of the back ink receiving layer") contains inorganic fine particles having an average particle diameter of 1 to 10 µm and a polyvinyl alcohol compound, and is closer to the water resistant support than the uppermost layer D3. Layer D2 (hereinafter referred to as "intermediate layer of the back ink receiving layer") contains inorganic fine particles having an average particle size of more than 0.1 and less than 1 µm and a hydrophilic binder, and is more water resistant than the intermediate layer D2. Lower layer D near An inkjet recording material characterized in that 1 (hereinafter referred to as "a lower layer of the back ink receiving layer") contains inorganic fine particles having an average primary particle diameter of 100 nm or less and a hydrophilic binder.

(3) At least one ink-receiving layer (G) containing inorganic fine particles having an average primary particle size of 100 nm or less and a hydrophilic binder on one surface of the water-resistant support (hereinafter referred to as "table ink-receiving layer"). Described) and an ink receiving layer (H) (hereinafter referred to as “back ink receiving layer”) provided on the other surface, the ink receiving layer (H) has two or more layers. , The uppermost layer (H2) farthest from the water-resistant support (hereinafter "the uppermost layer of the ink receiving layer on the back").
Contains a polyvinyl alcohol-based compound and spherical inorganic fine particles having an average particle size of 1 μm or more, and is a lower layer (H1) close to a water-resistant support (hereinafter “lower layer of the back ink-receiving layer”).
(Hereinafter referred to as “)” contains inorganic fine particles having an average primary particle size of 100 nm or less and a hydrophilic binder.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
The water-resistant support used in the present invention is a support in which at least one layer constituting the layer does not swell with water or does not permeate water, and examples thereof include polyester resins such as polyethylene terephthalate, diacetate resins, and triacetate resins. Acrylic resin, polycarbonate resin, polyvinyl chloride, polyimide resin, cellophane, celluloid, and other plastic resin films, paper and resin film bonded together, resin coating with a thermoplastic resin such as polyolefin resin laminated on at least one side of the paper Examples include paper. A water-resistant support having a thickness of 50 to 300 μm, preferably 100 to 260 μm is used. From the glossiness of the ink receiving layer surface, JIS-B0 of the water resistant support surface is used.
The cutoff value specified in 601-1982 is 0.8 m.
The center line average roughness (Ra) in m is 2.6 μm or less, and preferably 2 μm or less. After that, Ra is JIS-B-
The cutoff value specified in 0601-1982 is 0.8.
Represents centerline average roughness in mm.

The polyolefin resin-coated paper support preferably used in the present invention (hereinafter referred to as resin-coated paper) will be described in detail. The resin-coated paper used in the present invention is
The water content is not particularly limited, but is preferably in the range of 5 to 9%, more preferably in the range of 6 to 9%, in view of curling property. The water content of the resin-coated paper can be measured using an arbitrary water content measuring method. For example, infrared moisture meter,
An absolutely dry weight method, a dielectric constant method, a Karl Fischer method or the like can be used.

The base paper constituting the resin-coated paper is not particularly limited, and commonly used paper can be used, but more preferably, it is a smooth base paper such as that used for a photographic support. As the pulp constituting the base paper, one kind or two kinds of natural pulp, recycled pulp, synthetic pulp, etc.
Used as a mixture of two or more species. Additives such as a sizing agent, a paper strength enhancer, a filler, an antistatic agent, an optical brightening agent and a dye, which are generally used in papermaking, are added to the base paper.

Further, a surface sizing agent, a surface paper strength agent, a fluorescent whitening agent, an antistatic agent, a dye, an anchoring agent, etc. may be applied on the surface.

The thickness of the base paper is not particularly limited, but it is preferable that the paper has good surface smoothness, such as being compressed by applying pressure with a calendar or the like during or after paper making, and its basis weight is 30 to 250 g / m ² is preferable.

As the thermoplastic resin for coating the base paper, a polyolefin resin, a polyacrylic acid resin, a polyurethane resin or the like is used. As the polyolefin resin, low density polyethylene, high density polyethylene, polypropylene, polybutene, polypentene are used. , Homopolymers of olefins such as polystyrene, copolymers of two or more olefins such as ethylene-propylene copolymers, styrene-butadiene copolymers, and mixtures thereof, and various density and melt viscosity index (melt index)
These can be used alone or as a mixture thereof.

In the resin of the resin-coated paper, white pigments such as titanium oxide, zinc oxide, talc and calcium carbonate, fatty acid amides such as stearic acid amide and arachidic acid amide, zinc stearate, calcium stearate and stearic acid. Aluminum, fatty acid metal salts such as magnesium stearate, antioxidants such as Irganox 1010 and Irganox 1076, blue pigments and dyes such as Cobalt Blue, Ultramarine Blue, Cecilian Blue, Phthalocyanine Blue, Cobalt Violet, Fast Violet, Manganese Purple It is preferable to add various additives such as magenta pigments and dyes, fluorescent whitening agents, and ultraviolet absorbers in an appropriate combination.

The resin-coated paper is mainly produced by a so-called extrusion coating method, in which a thermoplastic resin such as a polyolefin resin is cast on a running base paper in a state of being heated and melted, and at least one surface thereof is coated with the resin. To be covered. Further, it is preferable that the base paper is subjected to an activation treatment such as a corona discharge treatment or a flame treatment before the resin is coated on the base paper. From the viewpoint of curl prevention, it is preferable to coat the back surface of the ink receiving layer with a thermoplastic resin, but the curl can be adjusted by the coating amount of the back ink receiving layer or the undercoat layer. It is preferable not to cover it in view of transportability when printing a large number of sheets continuously. The back surface is usually a matte surface, and the front surface or both front and back surfaces can be subjected to activation treatment such as corona discharge treatment and flame treatment, if necessary. The thickness of the resin coating layer is not particularly limited, but is generally 5 to 50 μm on one side.
It is coated on both the front and back sides to the thickness of. When only one side of the base paper is coated with a resin, the thickness of the resin coating layer is preferably about 5 to 25 μm from the viewpoint of curl of the obtained ink jet recording material.

The surface of the resin-coated paper of the present invention on which the ink receiving layer is applied (hereinafter referred to as the surface of the resin-coated paper) is mainly made by heating and melting a polyolefin resin on one side of the base paper with an extruder to form a base paper. It is manufactured by extruding in a film shape between a cooling roll and a cooling roll, press-bonding and cooling. At this time, the cooling roll is used to form the surface shape of the polyolefin resin coating layer, and the surface of the resin layer is shaped into a mirror surface, a finely rough surface, or a patterned silk-like or matte shape depending on the shape of the cooling roll surface. It is possible to process, and the patterning process is preferable from the viewpoint of printer transportability, but Ra is 2.6 μm or less from the gloss of the ink receiving layer surface.
It is preferably 2 μm or less, and particularly preferably 1.8 μm or less.

The surface of the resin-coated paper of the present invention which is opposite to the surface on which the ink receiving layer is coated (hereinafter referred to as the back surface of the resin-coated paper) is preferably not resin-coated from the viewpoint of continuous transportability, but curling and When a resin coating layer is provided for the purpose of improving a printed image, the polyolefin resin is mainly heated and melted by a melt extruder, extruded in a film form between a base paper and a cooling roll, pressure-bonded, and cooled to manufacture. At this time, Ra of the cooling roll is 0.3 to 5 μm, preferably 0.8 from the transportability in the printer and the printed image on the back surface.
It is preferable that the cooling roll has a finely rough surface depending on the shape of the surface of the cooling roll, or a pattern, for example, a matte shape or a matte shape.

The method for providing the thermoplastic resin coating layer on the front surface or the back surface of the base paper is, for example, a method of applying an electron beam curable resin and then irradiating with an electron beam, in addition to the method of extruding and applying a heat-melting resin.
After applying the coating solution of polyolefin resin emulsion, dry it,
There is a method of performing surface smoothing treatment. In either case, the resin-coated paper applicable to the present invention can be obtained by imprinting with a heat roll having irregularities.

An undercoat layer may be provided on the front and back surfaces of the resin-coated paper used in the present invention. This undercoat layer is applied and dried on the surface of the resin layer of the support in advance before the ink receiving layer is applied. The undercoat layer mainly contains a water-soluble polymer or polymer latex capable of forming a film. Preferred are water-soluble polymers of gelatin, polyvinyl alcohol, polyvinylpyrrolidone, water-soluble cellulose and the like and derivatives thereof, and gelatin is particularly preferable. The adhesion amount of these water-soluble polymers is 1
0 to 500 mg / m ² is preferable, 20 to 300 mg / m ²
Is more preferable. Furthermore, it is preferable that the undercoat layer further contains a surfactant or a hardener. Further, it is preferable to perform corona discharge before applying the undercoat layer to the resin-coated paper.

In the present invention, the reason why the transportability of continuous multiple-sheet printing is better when the resin coating layer is not provided on the back surface of the base paper as the water resistant support is not clear, but it is presumed as follows. . That is, since inorganic fine particles having an average particle size of 1 to 10 μm are used in the ink receiving layer on the back side for the purpose of improving writing performance, the surface of the rubber-like substance constituting the conveying roller is continuously conveyed to the inorganic fine particles of the ink receiving layer. When rubbing off scraps such as rubber and sticking to the surface of the transport roller, the back surface of the ink receiving layer and the roller surface become slippery, and it is presumed that transport failure will occur, and the resin layer is not provided on the back surface of the base paper. Since the pressure from the transport roller is directly applied to the base paper, it is easily compressed, and it becomes difficult for the rubber-like substance on the roller surface and the inorganic fine particles in the ink receiving layer to adhere to each other. It is presumed that the unevenness of the surface of the base paper is larger than the surface of the resin coating layer provided on the base paper, so that the adhesion between the inorganic fine particles and the roller surface is also reduced. .

The inorganic fine particles having an average primary particle size of 100 nm or less used in the ink receiving layer of the table of the present invention are synthetic silica such as vapor phase silica, alumina, hydrated alumina, calcium carbonate, magnesium carbonate, titanium dioxide. Etc. are used. From the viewpoint of glossiness and print density, it is preferable to use at least one of vapor phase method silica having an average primary particle diameter of 3 to 50 nm, alumina, and alumina hydrate.

In the present invention, the solid coating amount of the ink receiving layer in the table is generally 5 to 50 g / m ² , preferably 10 to 40 g / m ² , and more preferably 13 to 3 g.
It is in the range of 5 g / m ² . If the content is in the above range, cracks,
And the ink absorbency becomes good.

The synthetic silica used in the present invention includes a wet method and a vapor phase method. Usually, silica fine particles often refer to wet-process silica. As the wet process silica, silica sol obtained through metathesis of sodium silicate with an acid or the like or an ion exchange resin layer, or colloidal silica obtained by heating and aging this silica sol, and gelation of the silica sol, and by changing the formation conditions thereof Silica gel having a size of several μm to 10 μm, which is a three-dimensional secondary particle in which primary particles are siloxane-bonded, and silicic acid obtained by heating and producing silica sol, sodium silicate, sodium aluminate, etc. There are synthetic silicic acid compounds and the like.

The vapor-phase process silica preferably used in the present invention is also called a dry process as opposed to a wet process, and is generally produced by a flame hydrolysis method. Specifically, a method of burning silicon tetrachloride with hydrogen and oxygen is generally known, but instead of silicon tetrachloride, silanes such as methyltrichlorosilane and trichlorosilane may be used alone or in the form of silicon tetrachloride. It can be used as a mixture with.
Vapor phase silica is commercially available as Aerosil from Nippon Aerosil Co., Ltd. and QS type from Tokuyama Corp., and can be obtained.

The average particle diameter of the primary particles of the vapor-phase process silica of the present invention is preferably 3 to 50 nm, and in order to obtain higher gloss, it is 5 to 20 nm and the specific surface area by the BET method is 90 to 400 m ² / It is preferable to use g. The BET method referred to in the present invention is one of the methods for measuring the surface area of powder by the vapor phase adsorption method, and is a method for obtaining the total surface area of 1 g of a sample, that is, the specific surface area, from the adsorption isotherm. Nitrogen gas is often used as the adsorbed gas, and the most commonly used method is to measure the adsorbed amount from the change in pressure or volume of the adsorbed gas. The most prominent one for expressing the isotherm of multimolecular adsorption is the Brunauer, Emmett, and Teller equation, which is called the BET equation and is widely used for determining the surface area.
The surface area is obtained by determining the adsorption amount based on the BET formula and multiplying the area occupied by one adsorbed molecule on the surface.

When vapor-phase method silica is used, a recording material having good ink absorbency and high gloss can be obtained, but on the other hand, the cohesiveness of secondary particles is weak, probably because the silica surface has few silanol groups.
It has the drawback of being easily scratched. Due to this defect, problems such as scratches due to rubbing on the front and back surfaces become a problem, but they are improved by the present invention.

As the alumina of the present invention, γ-alumina which is a γ-type crystal of aluminum oxide is preferable, and δ is particularly preferable.
Group crystals are preferred. γ-alumina has 1 primary particle
It is possible to reduce the particle size to about 0 nm, but normally, secondary particle crystals of several thousands to tens of thousands nm are ultrasonically treated, a high pressure homogenizer, an opposed collision type jet crusher, etc.
Those crushed to about 00 nm can be preferably used.

The alumina hydrate preferably used in the present invention is represented by the constitutional formula of Al ₂ O ₃ .nH ₂ O (n = 1 to 3). When n is 1, it represents an alumina hydrate having a boehmite structure, and when n is more than 1 and less than 3, it is an alumina hydrate having a pseudo-boehmite structure. It can be obtained by a known production method such as hydrolysis of aluminum alkoxide such as aluminum isopropoxide, neutralization of aluminum salt with alkali, and hydrolysis of aluminate.

The average particle size of the primary particles of the alumina hydrate used in the present invention is preferably 3 to 50 nm, and in order to obtain higher gloss, it is 5 to 20 nm and the average aspect ratio (the surface with respect to the average thickness). It is preferable to use tabular grains having a ratio (average particle diameter of 1) of 2 or more.

The ink receiving layer in the table of the present invention is preferably composed of two or more layers for each purpose. The uppermost layer is intended to improve gloss and scratch resistance, and the lower layer is intended to improve ink absorption.

The ink receiving layer in the table of the present invention has an average particle size of 1 μm for improving scratch resistance, transportability and blocking property.
It is preferable to contain the above spherical particles, and it is more preferable to contain at least one kind of spherical particles having an average particle size of 1 to 7 μm and at least one kind of spherical particles having an average particle size of 10 μm or more. It is preferable that the spherical particles having an average particle diameter of 10 μm or more are larger than the film thickness of the ink receiving layer contained therein,
The upper limit is about 40 μm. Especially for the front ink receiving layer 2
It is preferable that the number of layers is two or more, and the above-mentioned two types of spherical particles are contained in the uppermost layer from the viewpoint of scratch resistance and glossiness, and the average particle diameter of particles of 10 μm or more is preferably larger than the thickness of the uppermost layer. It is preferable not to project more than 10 μm from the layer from the touch. Especially, the uppermost layer contains 1 to 10 g / m ^{2 of} inorganic fine particles, and the average particle diameter is 1 to 7 μm and 10 μm.
In the case of containing 0.005 to 0.2 g / m ² of spherical particles of m or more in total, the scratch resistance and the transportability are good and the ink absorbency is good.
A product with excellent gloss can be obtained. In particular, when printing on the ink receiving layer on the back side which is the address side for postcard applications, it is preferable because scratches can be prevented from occurring on the front ink receiving layer. Printing in this case is printing by a relief printing method, an intaglio printing method, or a lithographic printing method, and scratches are likely to occur due to rubbing between the ink receiving layer and a roll of a printing machine.

The reason why the use of spherical particles having an average particle size of 1 to 7 μm and 10 μm or more improves scratch resistance and transportability as compared with the case where they are used alone is presumed as follows. That is, even if spherical particles having a particle size of 10 μm or more are added, a convex portion is generated on the surface of the ink receiving layer, so that the scratch resistance and blocking property are improved, but when used in combination, spherical particles having a particle size of 1 to 7 μm have a spherical shape of 10 μm or more. It is expected that scratch resistance and transportability will be greatly improved by acting as a buffer against external force applied to the particles.

The spherical particles having an average particle size of 1 μm or more, which are preferably used in the ink receiving layer of the table of the present invention, are organic particles or inorganic particles having a substantially spherical shape,
Includes spheroids and those with fine irregularities on the particle surface. As spherical organic particles, polyethylene, polypropylene, polystyrene, polyacrylic acid ester, polymethacrylic acid ester, polyacrylamide, polyvinyl chloride, etc. and their copolymers. , Urea resin, melamine resin, and the like, and spherical inorganic particles include synthetic inorganic particles such as silica, calcium carbonate, magnesium carbonate, and titanium dioxide.

In the present invention, the average primary particle diameter of the particles is within a certain area by observing the dispersed particles with an electron microscope.
The diameter of a circle equal to the projected area of each of the 00 particles was determined as the particle diameter of the particles. The average primary particle size of the hydrated alumina of the present invention is measured in a flat state in the case of a flat plate. The average thickness of the tabular alumina hydrate is obtained by observing the cut surface of the sheet obtained by coating the alumina hydrate on the film, and the aspect ratio of the alumina hydrate is the ratio of the average particle diameter to the average thickness. can get. Further, the average particle size of the particles of the present invention,
It also includes the particle size of the primary particles and the secondary particles in which the primary particles are aggregated and integrated, and is obtained by electron microscope observation in the same manner as in the case of obtaining the average primary particle diameter of dispersed particles. .

The light resistance is improved by adding a known light resistance improver such as an ultraviolet absorber, a hindered amine and a hindered phenol to the ink receiving layer in the table of the present invention. In addition, a surfactant, a defoaming agent, a coloring agent or the like for improving the coating property can be added.

In the ink receiving layer in the table of the present invention, a hydrophilic binder having high transparency and high penetrability of ink is used in order to maintain characteristics as a film.
In using the hydrophilic binder, it is important that the hydrophilic binder does not swell and block the voids at the initial penetration of the ink. From this viewpoint, a hydrophilic binder having a low swelling property at around room temperature is preferable. In particular, polyvinyl alcohol compounds are used. Polyvinyl alcohol, polyethylene glycol, starch, dextrin, carboxymethyl cellulose and the like and derivatives thereof are used, but a particularly preferable hydrophilic binder is completely or partially saponified polyvinyl alcohol or cation-modified polyvinyl alcohol.

Among the polyvinyl alcohols, those partially or completely saponified with a saponification degree of 80% or more are particularly preferable. Polyvinyl alcohol having an average degree of polymerization of 500 to 5000 is preferable.

As the cation-modified polyvinyl alcohol, for example, as described in JP-A-61-10483, primary to tertiary amino groups and quaternary ammonium groups are added to the main chain or side chain of polyvinyl alcohol. It is polyvinyl alcohol contained therein.

In the ink receiving layer of the table of the present invention, the hydrophilic binder as a whole is 8 to 35% by mass based on the inorganic fine particles,
It is preferable to contain 10 to 25% by mass.

In the first embodiment of the back ink receiving layer of the present invention, the back ink receiving layer has two or more layers, and the uppermost layer has inorganic fine particles having an average particle size of 1 to 10 μm, polyvinyl alcohol, and an average particle size. Contains at least one kind of spherical organic particles larger than the inorganic fine particles, and the lower layer contains inorganic fine particles having an average primary particle diameter of 100 nm or less and a hydrophilic binder. The solid content of the uppermost layer is preferably 0.5 to 5 g
/ M ² . In this case, the uppermost layer has the ink permeability in the depth direction and the ink bleeding prevention property in the surface direction, the coating layer strength is strong, and the inorganic fine particle powder from the ink receiving layer and the rubber-like substance of the transport roller peel off. And the lower layer for the purpose of preventing ink bleeding, improving ink absorbency, and improving smoothness.

In the second embodiment of the back ink-receiving layer of the present invention, the back ink-receiving layer has three or more layers, and the uppermost layer contains inorganic fine particles having an average particle size of 1 to 10 μm and a polyvinyl alcohol compound. , The intermediate layer has an average particle size larger than 0.1 and 1
It contains inorganic fine particles of less than μm and a hydrophilic binder, and the lower layer contains inorganic fine particles having an average primary particle size of 100 nm or less and a hydrophilic binder. Preferably, the solid content of each of the uppermost layer and the intermediate layer is 0.5 to 5 g / m ² . More preferably, the uppermost layer contains at least one kind of spherical organic particles having an average primary particle size larger than that of the inorganic fine particles, so that the transportability in continuous multi-sheet printing is further improved. In this case, the uppermost layer has writability and scratch resistance, and has ink penetrability in the depth direction and ink bleeding prevention property in the surface direction, the coating layer strength is strong, and the inorganic fine particle powder from the ink receiving layer and the conveyance roller The intermediate layer has a strong coating layer strength, high ink absorbency and ink bleeding prevention property, and enhances the interlayer strength between the uppermost layer and the lower layer in order to prevent the rubber-like substance from peeling off and to improve the transportability. The purpose of the lower layer is to prevent ink bleeding, improve ink absorbency, and improve smoothness. It is speculated that by providing the intermediate layer of the present invention, the inorganic fine particles in the lower layer are less likely to be exposed on the surface, and also ink bleeding can be suppressed by suppressing the lateral spread of the ink between the upper layer and the lower layer. It By thickening the uppermost layer without providing the intermediate layer, the inorganic fine particles in the lower layer are less likely to be exposed, but the opacity is increased and the printing density is lowered, which is not preferable.

In the third embodiment of the back ink-receptive layer of the present invention, the back ink-receptive layer has two or more layers, and the uppermost layer farthest from the water-resistant support is the polyvinyl alcohol compound and the average particle size is 1 μm or more. Of spherical inorganic fine particles, and the lower layer near the water resistant support contains inorganic fine particles having an average primary particle diameter of 100 nm or less and a hydrophilic binder. In this case, by using spherical inorganic fine particles having an average particle size of 1 μm or more in the uppermost layer, the ink absorbency is high, the writability and scratch resistance are good, and the inorganic fine particle powder from the ink receiving layer and the rubber-like substance of the transport roller are used. It is possible to prevent peeling and peeling and improve the transportability. The use of inorganic fine particles having an average primary particle size of 100 nm or less in the lower layer makes it possible to prevent ink bleeding, improve ink absorbency, and improve smoothness.

The average particle size used for the uppermost layer in the first and second embodiments of the back ink-receiving layer of the present invention is from 1 to 1.
Examples of the 10 μm inorganic fine particles include silica, alumina, hydrated alumina, aluminum hydroxide, calcium carbonate,
Magnesium carbonate, titanium dioxide, clay, kaolin,
Although talc and the like can be mentioned, wet silica is preferable from the viewpoint of writing property. The inorganic fine particles used are preferably spherical inorganic fine particles in terms of the feel, print quality, transportability, and scratch resistance of the front ink-receiving layer, and the average particle diameter is 3 to 7 μm.
Is more preferable. When it is less than 1 μm, the ink absorption capacity is insufficient, so that the ink bleeding property is deteriorated and the writability is not sufficient.
The scratch resistance of the front ink receiving layer becomes insufficient. In order to improve continuous transportability, spherical inorganic fine particles having an average particle size of more than 10 μm in the third embodiment are added to the uppermost layer in the first and second embodiments of the back ink receiving layer of the present invention. Good.

The spherical inorganic fine particles having an average particle size of 1 μm or more used in the uppermost layer in the third aspect of the back ink-receiving layer of the present invention are the same as those of the back ink-receiving layer in the first and second aspects. Similar to the inorganic fine particles used in the uppermost layer, silica, alumina, alumina hydrate, aluminum hydroxide,
Spherical ones such as calcium carbonate, magnesium carbonate and titanium dioxide can be used. Spherical inorganic fine particles having an average particle diameter of 3 to 15 μm are preferable from the viewpoint of hand feeling, printed surface quality, transportability, and scratch resistance of the front ink receiving layer. Along with the spherical inorganic fine particles having an average particle size of 1 μm or more, the average particle size is 1 to
By using non-spherical inorganic fine particles of 10 μm in combination, especially non-spherical inorganic fine particles smaller than the average particle diameter of the spherical inorganic fine particles, continuous printing transportability of the ink receiving layer on the back side, ink absorbability, and front ink receiving The scratch resistance of the layer is further improved. It is presumed that the voids between the non-spherical inorganic fine particles and the spherical inorganic fine particles and the space between the transport roller and the non-spherical inorganic fine particles effectively influence. It is preferable that 10 to 80% by mass of the inorganic fine particles contained in the uppermost layer of the back ink receiving layer be spherical inorganic fine particles to further enhance the above-mentioned effects such as continuous printing transportability.

The first, second, and third ink-receiving layers of the back of the present invention
The polyvinyl alcohol-based compound is used for the uppermost layer in the third aspect from the viewpoint of ink bleeding property, and the content thereof is preferably 30 to 8 in terms of solid content with respect to the inorganic fine particles.
It is 0% by mass, more preferably 40 to 70% by mass. By the above range, the writability, film strength, ink bleeding property,
Good transportability.

The first, second, and third ink-receiving layers of the back of the present invention
And the top layer of the coating amount of the third aspect is at 0.5 g / m ² or more as a solid content, preferably 0.5 to 5 g / m ^2, more preferably from 0.8~3g / m ^2. Within the above range, the writability, coating layer strength, ink bleeding, ink density, and ink absorbency will be better.

The average particle size used in the intermediate layer of the second aspect of the back ink-receiving layer of the present invention is greater than 0.1 and 1
As the inorganic fine particles having a particle size of less than μm, the same silica, alumina, alumina hydrate as the inorganic fine particles used in the uppermost layer,
Aluminum hydroxide, calcium carbonate, magnesium carbonate, titanium dioxide, clay, kaolin, talc and the like can be mentioned, but wet silica and gas phase method silica which is preferably used in the ink receiving layer in the table are particularly preferable. From the viewpoint of ink absorbency and smoothness, the average particle size of the inorganic fine particles used is particularly preferably 0.2 to 0.8 μm. If the average particle size is smaller than 0.1 μm, the ink absorption capacity is insufficient, and the ink bleeding property is deteriorated. If the average particle size is larger than 1 μm, the transportability when printing a large number of continuous sheets is deteriorated.

The hydrophilic binder used in the intermediate layer in the second embodiment of the back ink-receiving layer of the present invention is polyvinyl alcohol, polyethylene glycol, starch, dextrin, carboxymethyl cellulose, etc. used in the front ink-receiving layer. Particularly preferred hydrophilic binders are fully or partially saponified polyvinyl alcohol or cation-modified polyvinyl alcohol. The content of the hydrophilic binder is preferably 2 in terms of solid content with respect to the inorganic fine particles contained in the intermediate layer.
The amount is 0 to 60% by mass, and more preferably 30 to 50% by mass. Within the above range, the ink absorbency, the ink bleeding property, the film strength, and the transportability in continuous multiple-sheet printing are improved.

The solid content of the intermediate layer in the second embodiment of the back ink receiving layer of the present invention is 0.5 g / m ² or more, preferably 0.5 to 5 g / m ² , and more preferably Is 0.8 to 3 g / m ² . Within the above range, the ink absorbency and the film strength will be good. Within the above range, the coating layer strength, the transportability when printing a large number of continuous sheets, the ink absorbency, the ink bleeding property, and the print density become better.

The first, second, and third ink-receiving layers of the back of the present invention,
The inorganic fine particles having an average primary particle size of 100 nm or less used in the lower layer in the third aspect are synthetic silica such as vapor phase method silica, alumina, hydrated alumina, calcium carbonate used in the ink receiving layer in the table. , Magnesium carbonate, titanium dioxide, etc. are used. Preferably, at least one of fumed silica having an average primary particle size of 3 to 50 nm, alumina, and alumina hydrate is used.

The first, second, and third ink-receiving layers of the back of the present invention,
And the hydrophilic binder used in the lower layer in the third aspect is polyvinyl alcohol, polyethylene glycol, starch, dextrin, carboxymethyl cellulose, or the like used in the intermediate layer of the front ink-receiving layer or the back ink-receiving layer. Derivatives are used, but a particularly preferred hydrophilic binder is fully or partially saponified polyvinyl alcohol or cation-modified polyvinyl alcohol. The content of the hydrophilic binder is preferably 10 to 40% by mass and more preferably 10 to 30% by mass in terms of solid content with respect to the inorganic fine particles contained in the lower layer.
Within the above range, the ink absorbency, the ink bleeding property, the film strength, and the transportability in continuous multiple-sheet printing are improved.

In the present invention, the coating amount of the lower layer in the first, second and third aspects of the back ink receiving layer is
Generally, the solid content is 5 to 30 g / m ² , preferably 5 to 25 g / m ² , and more preferably 8 to ²
It is 0 g / m ² . Within the above range, the ink absorbency, ink bleeding, and smoothness will be better.

In the present invention, the solid content ratio E3 of the polyvinyl alcohol compound contained in the uppermost layer of the second embodiment of the back ink receiving layer to the inorganic fine particles, and the solid content of the hydrophilic binder contained in the intermediate layer to the inorganic fine particles. When the relationship of the ratio E2 and the solid content ratio E1 of the hydrophilic binder contained in the lower layer to the inorganic fine particles satisfies the following expression (1), the continuous transportability at the time of printing the ink receiving layer on the back side becomes better. Although the reason is unknown, the surface of the inorganic fine particles is likely to be covered because the ratio of the polyvinyl alcohol-based compound in the uppermost layer is large, and in addition to being difficult to scratch the transport roll surface, the uppermost layer and the intermediate layer are It is presumed that the lower layer is hard to be exposed because it is hard to peel off, and the inorganic fine particles having a small particle diameter are hard to be peeled off, so that the friction coefficient between the transport roller and the surface of the ink receiving layer is hard to be lowered. Formula (1) E3 ≧ E2 ≧ E1

In the present invention, 100 is formed as the lower layer of the back ink receiving layer.
By providing the inorganic fine particles of nm or less, the printing density is high, the ink is less likely to spread laterally in the lower layer of the ink receiving layer, and clearer printing is possible. The reason is presumed to be as follows. That is, when inorganic fine particles having an average particle size of more than 1 μm are used in the lower layer of the ink receiving layer, the density of the printed coloring material is less likely to occur due to the high opacity of the lower layer, and the ink is laterally spread in the layer. When an intermediate layer having inorganic fine particles having an average particle diameter of 0.1 to 1 μm is provided, the inorganic fine particles easily fall into the voids in the lower layer, and therefore, between the lower layer and the intermediate layer in the ink receiving layer. The ink absorption rate decreases, resulting in ink bleeding. Even when inorganic fine particles having an average particle diameter of 0.1 to 1 μm are used in the lower layer of the ink receiving layer, the opacity of the layer is high, and the ink is likely to spread laterally in the lower layer, making it difficult to print clearly.

For the back ink receiving layer of the present invention, spherical organic particles having an average particle size of 1 μm or more, which are similar to those preferably used for the front ink receiving layer, are preferably used. The average particle size of the spherical organic particles is preferably larger than the average particle size of the inorganic fine particles contained in the same layer, and the upper limit is 40 μm.
It is a degree. In particular, it is preferable to include spherical organic particles in the uppermost layer of the first, second, and third aspects of the back side ink receiving layer from the viewpoint of scratch resistance and transportability in continuous multiple-sheet printing. It is particularly preferable that the average particle diameter of the spherical organic particles contained in the uppermost layer is larger than the film thickness of the uppermost layer, but it is preferable that it does not protrude more than 10 μm from the ink receiving layer from the touch. The coating amount of the solid content of the spherical organic particles having an average particle diameter of 1 μm or more contained in the back ink receiving layer is 0.
005-2g / m ² , preferably 0.01-1.5g / m ²
By this, continuous transportability and tactile sensation are improved. In particular, when spherical organic particles are contained in the uppermost layer of the ink receiving layer on the back side, a small particle size can provide a large effect of improving continuous transportability. When the solid content is 100% by mass or less, the ink absorbency becomes good. The reason why the transportability of continuous multiple-sheet printing is improved by the spherical organic particles of the present invention is not clear, but by using the spherical organic particles, the rubber-like substance on the surface of the transport roller is peeled off by the inorganic fine particles in the uppermost layer. In addition to the effect of preventing the above, the uppermost layer and the intermediate layer are peeled off by pressure and rubbing during transportation, and the fine inorganic fine particles of the intermediate layer and the lower layer, especially the inorganic fine particles having an average primary particle size of 100 nm or less contained in the lower layer are The reason why the spherical organic particles are used to prevent the peeling of the uppermost layer is that the sheet is exposed and is deposited on the surface of the transport roll to make the sheet slippery and difficult to transport.

In the present invention, preferably, the front and back ink receiving layers contain a water-soluble metal compound to prevent cracking. Therefore, it is possible to further reduce the hydrophilic binder amount and further increase the inorganic fine particle adhesion amount in order to improve the ink absorbability.

The water-soluble metal compound is, for example, a water-soluble polyvalent metal salt selected from calcium, barium, manganese, copper, cobalt, nickel, aluminum, iron, zinc, zirconium, chromium, magnesium, tungsten and molybdenum. And water-soluble salts of metals. Specifically, for example, calcium acetate, calcium chloride, calcium formate, calcium sulfate, barium acetate,
Barium sulfate, barium phosphate, manganese chloride, manganese acetate, manganese formate dihydrate, manganese ammonium sulfate hexahydrate, cupric chloride, ammonium copper (II) chloride
Dihydrate, copper sulfate, cobalt chloride, cobalt thiocyanate, cobalt sulfate, nickel sulfate hexahydrate, nickel chloride hexahydrate, nickel acetate tetrahydrate, nickel ammonium sulfate hexahydrate, nickel amide sulfate sulfate Tetrahydrate, aluminum sulfate, aluminum sulfite, aluminum thiosulfate, polyaluminum chloride, aluminum nitrate nonahydrate, aluminum chloride hexahydrate, ferrous bromide, ferrous chloride, ferric chloride, sulfuric acid Ferrous iron, ferric sulfate, zinc phenolsulfonate, zinc bromide, zinc chloride, zinc nitrate hexahydrate, zinc sulfate, zirconium acetate, zirconium chloride,
Zirconium oxide chloride octahydrate, zirconium hydroxychloride, chromium acetate, chromium sulfate, magnesium sulfate,
Magnesium chloride hexahydrate, magnesium citrate nonahydrate, sodium phosphotungstate, sodium tungsten citrate, 12 tungstophosphoric acid n hydrate, 12 tungstosilicic acid 26 hydrate, molybdenum chloride, 12 molybdophosphoric acid Examples include n-hydrate.

In the present invention, it is preferable that the front and back ink receiving layers contain a cationic polymer in order to improve water resistance. Examples of the cationic polymer include polyethyleneimine, polydiallylamine, polyallylamine, and JP-A-59-20696 and 59-33176.
No. 59-33177, No. 59-155088,
60-11389, 60-49990, 60
-83882, 60-109894, 62-1
98493, 63-49478, 63-115.
780, 63-280681, JP-A-1-403.
No. 71, No. 6-234268, No. 7-125411.
No. 1, No. 10-193776 and the like.
Polymers having a primary amino group and a quaternary ammonium salt group are preferably used. The molecular weight of these cationic polymers is preferably 5,000 or more, more preferably 5,000 to 1
About 0,000 is preferable.

The amount of these cationic polymers to be used is 0.5 to 10% by mass, preferably 1 to 8% by mass with respect to the inorganic fine particles in both the front ink receiving layer and the back ink receiving layer.

In the present invention, the ink receiving layer may preferably contain various oil droplets in order to improve the brittleness of the film. Examples of such oil droplets are hydrophobic high-boiling point organic solvents having a solubility in water at room temperature of 0.01% by weight or less (for example, liquid paraffin, dioctyl phthalate, tricresyl phosphate, silicone oil, etc.) and polymer particles ( For example, styrene, butyl acrylate,
Particles obtained by polymerizing one or more polymerizable monomers such as divinylbenzene, butyl methacrylate, hydroxyethyl methacrylate) may be included. Such oil droplets are preferably 10 to 50 relative to the hydrophilic binder.
It can be used in the range of mass%.

In the present invention, the ink receiving layer preferably contains a hardener together with a hydrophilic binder. Specific examples of the hardening agent include formaldehyde, an aldehyde compound such as glutaraldehyde, diacetyl,
Ketone compounds such as chlorpentanedione, bis (2-
Chloroethylurea) -2-hydroxy-4,6-dichloro-1,3,5triazine, U.S. Pat. No. 3,288,7
No. 75, a compound having a reactive halogen, such as divinyl sulfone, a compound having a reactive olefin, such as those described in US Pat. No. 3,635,718, and an N-- compound such as described in US Pat. No. 2,732,316. Methylol compounds, isocyanates such as those described in US Pat. No. 3,103,437, US Pat. Nos. 3,017,280 and 2,
983,611, aziridine compounds, U.S. Pat. No. 3,100,704, carbodiimide compounds, U.S. Pat. No. 3,091,537, epoxy compounds, and mucochloric acid, halogen carboxaldehydes. And dioxane derivatives such as dihydroxydioxane, inorganic hardeners such as chromium alum, zirconium sulfate, boric acid and borates.
They may be used alone or in combination of two or more. Among these, boric acid or borate is particularly preferable. The amount of the hardener added is preferably 0.1 to 40% by mass, and more preferably 0.5 to 30% by mass, with respect to the hydrophilic binder constituting the ink receiving layer.

In the present invention, the ink receiving layer further includes a coloring agent, a coloring pigment, an ultraviolet absorber, an antioxidant, a pigment dispersant, a defoaming agent and a leveling agent in addition to the surfactant and the hardener. Various known additives such as antiseptics, optical brighteners, viscosity stabilizers, and pH adjusters can also be added.

In the present invention, the coating method of the front ink-receiving layer and the back ink-receiving layer is not particularly limited,
When two or more ink receiving layers in the table are coated simultaneously or continuously, a coating device such as a slide bead coater, a curtain coater or an extrusion coater can be used. A combination of the above coating devices and an air knife coater can be used. It is possible to continuously coat with a coater, a rod coater, a blade coater, etc. by the above coating device. In the present invention, simultaneous coating means coating each layer substantially at the same time, and continuous coating means continuously coating the upper layer after a short time (usually within about 10 seconds) without a drying step after coating the lower layer. Simultaneous coating is preferable from the viewpoint of uniformity of the ink receiving layer.

[0070]

The present invention will be described in detail below with reference to examples, but the contents of the present invention are not limited to the examples.
The parts and% in the examples and comparative examples represent parts by mass and% by mass, respectively.

Example 1 <Preparation of Polyolefin Resin Coated Paper Support> A 1: 1 mixture of a bleached hardwood kraft pulp (LBKP) and a bleached hardwood sulfite pulp (LBSP) was beaten to 300 ml at Canadian standard freeness, and the pulp was pulped. A slurry was prepared. Alkyl ketene dimer as a sizing agent to 0.5% by weight of pulp, polyacrylamide as a strength agent to 1.0% by weight of pulp, cationized starch to 2.0% by weight of pulp, and polyamide epichlorohydrin resin. 0.5% by mass of pulp was added and diluted with water to obtain a 1% slurry. This slurry was made into paper by a Fourdrinier paper machine so as to have a basis weight of 170 g / m ² , dried and conditioned to obtain a base paper for polyolefin resin-coated paper. Low-density polyethylene with a density of 0.918 g / cm ^{3 on} paper
32% of a polyethylene resin composition in which 10% by mass of anatase-type titanium is uniformly dispersed in 00% by mass of resin
It was melted at 0 ° C., extrusion-coated to a thickness of 15 μm at 200 m / min, and a slightly roughened surface coating layer was provided using a cooling roller having a slightly roughened surface to form a resin coating layer on the front surface. .

A high-frequency corona discharge treatment was applied to the front surface of the above polyolefin resin-coated paper, and then an undercoat layer having the following composition was coated and dried so that gelatin was 50 mg / m ² to prepare a support.

[0073] <Undercoat layer> 100 parts of lime-processed gelatin Sulfosuccinic acid-2-ethylhexyl ester salt 2 parts Chrome Alum 10 copies

On the back surface of the above resin-coated paper, the lower layer coating liquid 1 of the back ink-receiving layer having the following composition was solid content of 22 g / m ² , and the intermediate layer coating liquid 1 of the back ink-receiving layer was 1.5 g of solid content. /
m ² , the top layer coating liquid 1 of the ink receiving layer on the back side was 1.
Simultaneously applied with a slide bead coater so as to be 5 g / m ² and dried. Then, the lower layer coating liquid 1 of the ink receiving layer having the composition shown below was applied to the surface of the resin-coated paper at a solid coating amount of 1
9 g / m ² of coating liquid 1 for the uppermost layer of the ink receiving layer in the table was simultaneously coated with a slide bead coater so that the coating amount was 4 g / m ² in solid content, and dried.

[0075] <Lower layer coating liquid 1 of the back ink receiving layer> 100 parts of vapor phase silica   (Average primary particle size 7 nm) Dimethyldiallylammonium chloride homopolymer 4 parts   (Daiichi Kogyo Seiyaku Co., Ltd., Charol DC902P, molecular weight 9000) Boric acid 3 parts Polyvinyl alcohol 22 parts   (Saponification degree 88%, average degree of polymerization 3500) Cationic surfactant 0.3 parts   (Kyoeisha Chemical Co., Ltd., Catiolite BC)

[0076] <Intermediate layer coating liquid 1 for the ink receiving layer on the back> Wet silica 100 parts   (Mizukasil P78A beads mill crushed product, average particle size 0 ． 7 μm) Boric acid 8.7 parts Polyvinyl alcohol 40 parts   (Saponification degree 88%, average degree of polymerization 3500) Cationic surfactant 0.3 parts   (Kyoeisha Chemical Co., Ltd., Catiolite BC)

[0077] <Uppermost layer coating liquid 1 of the ink receiving layer on the back> Wet silica 100 parts   (Mizukasil P-78A, manufactured by Mizusawa Chemical Co., Ltd., average particle size 3 μm) 20 parts of spherical organic particles   (Sekisui Chemical's polystyrene, SBX-6, average particle size 6 μm) Boric acid 8.7 parts Polyvinyl alcohol 50 parts   (Saponification degree 88%, average degree of polymerization 3500) Cationic surfactant 0.3 parts   (Kyoeisha Chemical Co., Ltd., Catiolite BC)

[0078] <Lower layer coating liquid 1 of the ink receiving layer in the table> 100 parts of vapor phase silica   (Average primary particle size 7 nm) Dimethyldiallylammonium chloride homopolymer 4 parts   (Daiichi Kogyo Seiyaku Co., Ltd., Charol DC902P, molecular weight 9000) Boric acid 3 parts Polyvinyl alcohol 22 parts   (Saponification degree 88%, average degree of polymerization 3500) Cationic surfactant 0.3 parts   (Kyoeisha Chemical Co., Ltd., Catiolite BC)

[0079] <Uppermost coating liquid 1 for the ink receiving layer in the table> 100 parts of vapor phase silica   (Average primary particle size 7 nm) Dimethyldiallylammonium chloride homopolymer 4 parts   (Daiichi Kogyo Seiyaku Co., Ltd., Charol DC902P, molecular weight 9000) Spherical organic particles 0.5 part   (Sekisui Chemical's polystyrene, SBX-17, average particle size 17 μm) Spherical organic particles 1 part   (Sekisui Chemical's polystyrene, SBX-6, average particle size 6 μm) Boric acid 3 parts Polyvinyl alcohol 22 parts   (Saponification degree 88%, average degree of polymerization 3500) Cationic surfactant 0.3 parts   (Kyoeisha Chemical Co., Ltd., Catiolite BC)

The recording material prepared as described above has continuous front and back printability, scratch resistance of the front ink receiving layer, back ink bleeding property, coatability, back coating layer strength, curl property, and writing. The sex was evaluated by the following method. The results are shown in Table 1.

<Continuous printing transportability> Under the conditions of 23 ° C. and 50% RH, the ink receiving layer of the front side of the ink jet recording material of 300 sheets and the ink jet recording material of 300 sheets by the ink jet printer PM-880C manufactured by Seiko Epson. Continuous printing was performed on each of the ink receiving layers on the back side of the sheet to evaluate the transportability. The surface of the transport roller was wiped with alcohol before evaluation. ⊚: No blank feed occurred. ◯: The blank feeding occurred between the 250th sheet and the 300th sheet. B: Blank feeding occurred between 200 and 250 sheets. X: Jump feeding occurred up to the 200th sheet.

<Transportability after front-side printing (transportability of back-side printing after front-side printing)> With an ink jet printer PM-880C manufactured by Seiko Epson under the conditions of 23 ° C. and 50% RH.
Solid printing was performed on the front ink-receiving layer of 100 sheets of the inkjet recording material, and then printing was performed on the back ink-receiving layer to evaluate the transportability during back-side printing. ◯: Double feeding did not occur at all. Δ: Double feeding occurred once or twice. X: Double feeding occurred three or more times.

<Scratch resistance of the ink receiving layer in the table> Two sheets of non-printed ink jet recording material are overlaid, and 1 is placed thereon.
After the lower recording material was extracted with a weight of 00 g left, scratches on the ink receiving layer on the surface of the remaining recording material were visually observed. ◯: No scratch on the ink receiving layer in the table was observed. B: Some scratches on the ink receiving layer in the table were observed, but there was no problem in practical use. X: The ink receiving layer in the table is markedly scratched and cannot be put to practical use.

<Backside ink bleeding property> An ink jet printer P manufactured by Seiko Epson Co., Ltd. on the back side of the ink receiving layer of the ink jet recording material under the conditions of 20 ° C. and 65% RH.
Print color (C, M, Y) characters with M-880C,
The ink bleeding property was evaluated. ○: There is no problem in recognizing characters without being crushed. △: There is some character collapse, but there is no problem in recognizing. ×: The character is broken and the character cannot be recognized.

<Back Writability> Characters were written on the ink receiving layer on the back of the ink jet recording material with an HB core mechanical pen to evaluate the writability. ◯: When writing a character, the character can be recognized without peeling of the coating film. Δ: When writing a character, the character can be recognized although there is some peeling of the coating film. X: When a character is written, the coating film is peeled off or the character cannot be recognized due to the density.

<Backside coatability> The coatability when the coating solution for the ink receiving layer on the backside during production was coated with a slide bead coater was evaluated. ○: Can be applied without problems. Δ: Striations are formed at the time of application, and it is difficult for the liquid to spread uniformly, but application is possible. X: Streaks are formed during application, and the liquid is difficult to spread evenly, so application is not possible.

Example 2 InkJet of Example 2 was repeated except that the coating amount of solid content of the uppermost layer of the back ink receiving layer was changed from 1.5 g / m ² to 0.6 g / m ^2. A recording material for use was obtained. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Example 3 Inkjet recording of Example 3 was carried out in the same manner as in Example 1 except that the coating amount of the solid content of the uppermost layer of the back ink receiving layer was changed from 1.5 g / m ² to 4 g / m ^2. Got the material. Example 1
Table 1 shows the results of the same evaluation.

Example 4 An ink jet recording material of Example 4 was obtained in the same manner as in Example 1, except that the amount of polyvinyl alcohol in the uppermost layer of the back ink receiving layer was changed to 35 parts based on 100 parts of the inorganic fine particles. . Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Example 5 An ink jet recording material of Example 5 was obtained in the same manner as in Example 1 except that the amount of polyvinyl alcohol in the intermediate layer of the back ink receiving layer was 55 parts with respect to 100 parts of the inorganic fine particles. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Example 6 The same procedure as in Example 1 was repeated except that the uppermost wet silica in the back ink receiving layer was changed from an average particle size of 3 μm to 8 μm (Mizukasil P-78D manufactured by Mizusawa Chemical Industry Co., Ltd.). Example 6
A recording material for inkjet of was obtained. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Example 7 In Example 1, the uppermost layer of the ink-receiving layer shown in the table was eliminated, and the coating liquid of the lower layer was made to have a solid content of 23 g / m ^2.
A recording material for inkjet of was obtained. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Example 8 An ink jet recording material of Example 8 was obtained in the same manner as in Example 1 except that spherical organic particles were removed from the composition of the uppermost layer of the back ink receiving layer. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Example 9 An ink jet recording material of Example 9 was obtained in the same manner as in Example 1 except that the uppermost layer of the ink receiving layer shown in Example 1 had the following composition. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

[0095] <Uppermost coating liquid 2 for the ink receiving layer in the table> Alumina hydrate 100 parts   (Pseudoboehmite, average primary particle size 15nm, flat plate with aspect ratio 5) Dimethyldiallylammonium chloride homopolymer 4 parts   (Daiichi Kogyo Seiyaku Co., Ltd., Charol DC902P, molecular weight 9000) Spherical particle 0.5 part   (Silica particles manufactured by Asahi Glass Co., Ltd., H121, average particle size 12 μm) Spherical organic particles 1 part   (Sekisui Chemical's polystyrene, SBX-6, average particle size 6 μm) 1 part boric acid Polyvinyl alcohol 15 parts   (Saponification degree 88%, average degree of polymerization 3500) Cationic surfactant 0.3 parts   (Kyoeisha Chemical Co., Ltd., Catiolite BC)

Example 10 In Example 1, except for the intermediate layer of the ink receiving layer on the back side, there were two layers, an uppermost layer and a lower layer, and the solid content coating amount was 1.5 g / uppermost layer.
An inkjet recording material of Example 10 was obtained in the same manner as in Example 1 except that the coating was carried out by a slide bead coater so that the lower layer had a m ² of 23.5 g / m ² . Table 1 shows the results of evaluation performed in the same manner as in Example 1.

[0097] Example 11 Preparation of the polyolefin resin-coated paper of Example 1, the density on the back surface of the base paper 0.918 g / cm ³ low-density polyethylene and a density 0.962 g / cm ³ density polyethylene each 50 wt% The resin composition mixed with is melted at 320 ° C., extrusion coated to a thickness of 15 μm at 200 m / min, and a resin coating layer on the back surface of the slightly rough surface is provided by using a cooling roller having a slightly rough surface. A polyolefin resin-coated paper support having resin coating layers on both sides of the base paper was obtained in the same manner except for the above. An inkjet recording material of Example 11 was obtained in the same manner as in Example 1 except that the obtained resin-coated paper support was used. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Example 12 An ink jet recording material of Example 12 was obtained in the same manner as in Example 10 except that the polyolefin resin-coated paper support used in Example 11 was used. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Example 13 An ink jet recording material of Example 13 was obtained in the same manner as in Example 10 except that the backmost ink-receiving layer had the following composition. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

[0100] <Uppermost coating liquid 2 of the ink receiving layer on the back> Wet silica 60 parts   (Mizukasil P78A, manufactured by Mizusawa Chemical Co., Ltd., average particle size 3 μm) 40 parts of spherical inorganic particles   (Synthetic silica manufactured by Asahi Glass Co., Ltd., H121, average particle size 12 μm) Boric acid 8.7 parts Polyvinyl alcohol 50 parts   (Saponification degree 88%, average degree of polymerization 3500) Cationic surfactant 0.3 parts   (Kyoeisha Chemical Co., Ltd., Catiolite BC)

Example 14 An ink jet recording material of Example 14 was obtained in the same manner as in Example 13 except that the uppermost layer of the back ink receiving layer was changed to the following composition. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

[0102] <Uppermost coating liquid 3 of the ink receiving layer on the back> Wet silica 85 parts   (Mizukasil P78A manufactured by Mizusawa Chemical Co., Ltd., average primary particle size 3 μm) 15 parts spherical inorganic particles   (Synthetic silica manufactured by Asahi Glass Co., Ltd., H121, average primary particle size 12 μm) Boric acid 8.7 parts Polyvinyl alcohol 50 parts   (Saponification degree 88%, average degree of polymerization 3500) Cationic surfactant 0.3 parts   (Kyoeisha Chemical Co., Ltd., Catiolite BC)

Example 15 An ink jet recording material of Example 15 was obtained in the same manner as in Example 13, except that the uppermost layer of the back ink receiving layer was changed to the following composition. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

[0104] <Uppermost layer coating liquid 4 of the ink receiving layer on the back> Wet silica 95 parts   (Mizukasil P78A manufactured by Mizusawa Chemical Co., Ltd., average primary particle size 3 μm) Spherical inorganic particles 5 parts   (Synthetic silica manufactured by Asahi Glass Co., Ltd., H121, average primary particle size 12 μm) Boric acid 8.7 parts Polyvinyl alcohol 50 parts   (Saponification degree 88%, average degree of polymerization 3500) Cationic surfactant 0.3 parts   (Kyoeisha Chemical Co., Ltd., Catiolite BC)

Example 16 An ink jet recording material of Example 16 was obtained in the same manner as in Example 13 except that the polyolefin resin-coated paper support used in Example 11 was used. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Comparative Example 1 Comparison was made in the same manner as in Example 11, except that the uppermost layer and the intermediate layer of the ink receiving layer on the back side of Example 11 were omitted, and the coating amount of the lower layer was 25 g / m ² in terms of solid content and one layer was applied. A recording material for an injet of Example 1 was obtained. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Comparative Example 2 A coating liquid in which the intermediate layer and the lower layer of the ink receiving layer on the back of Example 11 were removed and spherical organic particles were removed from the composition of the uppermost layer, and the coating amount was 25 g / m ² in terms of solid content. A recording material for ink jet of Comparative Example 2 was obtained in the same manner except that it was applied as a single layer. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Comparative Example 3 An ink jet recording material of Comparative Example 3 was obtained in the same manner as in Example 12, except that the spherical organic particles were omitted from the composition of the uppermost layer of the back ink receiving layer. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Comparative Example 4 Wet silica having an average particle size of 3 μm, which is an inorganic fine particle in the uppermost layer of the ink receiving layer on the back side of Example 12, was mixed with alumina sol having an average particle size of 20 nm (Alumina sol-520 manufactured by Nissan Chemical Industries, Ltd.).
Except that the spherical organic particles were omitted, an inkjet recording material of Comparative Example 4 was obtained. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Comparative Example 5 Wet silica as the uppermost layer of the ink receiving layer on the back side of Example 12 had an average particle size of 12.5 μm (P-78, manufactured by Mizusawa Science Co., Ltd.).
An inkjet recording material of Comparative Example 5 was obtained in the same manner except that it was changed to F) and the spherical organic particles were omitted. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

Comparative Example 6 In Example 12, the uppermost polyvinyl alcohol in the back ink receiving layer was gelatin (manufactured by Nikka Gelatin Co., Ltd., IK-2).
000) instead of 50 parts to 80 parts and omitting boric acid and spherical organic particles.
A recording material for inkjet of was obtained. The results of evaluation performed in the same manner as in Example 1 are shown in Table 1.

[0112]

[Table 1] ────────────────────────────────────           Continuous transportability After printing           Front and back transportability Scratch resistance Ink bleeding Writability Applicability ──────────────────────────────────── Example 1 ◎ ◎ ○ ○ ○ ○ ○ ○ Example 2 ◎ ○ ○ ○ ○ △ ○ Example 3 ◎ ◎ ○ ○ △ ○ ○ Example 4 ◎ ○ ○ ○ △ ○ ○ Example 5 ◎ ◎ ○ ○ △ ○ ○ Example 6 ◎ ○ ○ △ △ ○ ○ Example 7 ○ ◎ △ △ ○ ○ ○ Example 8 ◎ ○ △ △ ○ ○ ○ Example 9 ◎ ◎ ○ ○ ○ ○ ○ ○ Example 10 ◎ ○ ○ ○ ○ ○ ○ Example 11 ◎ ○ ○ ○ ○ ○ ○ Example 12 ◎ △ ○ ○ ○ ○ ○ Example 13 ◎ ○ ○ ○ ○ ○ ○ Example 14 ◎ ○ ○ ○ ○ ○ ○ Example 15 ◎ △ ○ △ ○ ○ ○ Example 16 ◎ △ ○ ○ ○ ○ ○ Comparative Example 1 ◎ ○ △ ○ ○ × ○ Comparative Example 2 ◎ × ○ ○ × ○ △ Comparative Example 3 ◎ × △ ○ ○ ○ ○ Comparative Example 4 ◎ △ △ ○ ○ × ○ Comparative Example 5 ◎ × ○ × × ○ ○ Comparative Example 6 ◎ ○ × ○ × △ ○ ────────────────────────────────────   Note 1: "Front" indicates the front ink receiving layer "Back" indicates the back ink receiving layer.   Note 2: Conveyability after printing is that after printing the front ink receiving layer, The transportability during printing is shown.

From the above results, the ink jet recording materials of Examples 1 to 16 of the present invention are excellent in continuous transportability by a printer, have little ink bleeding in the ink receiving layer on the back side, are excellent in writability, and are capable of receiving ink in the front side. The ink absorption of the layer was good, the image quality was photo-like, and the result was that the ink receiving layer was not easily scratched during manufacturing, processing and handling.

In Example 11, the uppermost layer of the back ink receiving layer,
Also, the inkjet recording material of Comparative Example 1 in which the intermediate layer was eliminated and the coating amount of the lower layer was increased, the back ink receiving layer was frequently scratched, the writability of the back was deteriorated, and the back printing transportability after front printing Has dropped. The ink jet recording material of Comparative Example 2 in Example 11 in which the intermediate layer and the lower layer of the ink receiving layer on the back side were removed and spherical organic particles were removed from the composition of the uppermost layer to increase the coating amount was The ink bleeding on the back side deteriorated, and the coating property deteriorated. The inkjet recording material of Comparative Example 3 obtained by removing spherical organic particles from the composition of the uppermost layer of the ink receiving layer on the back in Example 12 deteriorates the continuous transportability on the back,
The reverse printing transportability after front printing was reduced. Inkjet recording of Comparative Example 4 in which the wet silica having an average primary particle diameter of 3 μm, which is the inorganic fine particle in the uppermost layer of the back ink receiving layer in Example 12, was changed to an alumina sol having an average primary particle diameter of 20 nm, and the spherical organic particles were omitted. Regarding the material, the writability on the back side was deteriorated, and the continuous transportability and the backside print transportability after front printing were deteriorated. In Example 12, the uppermost wet silica of the back ink receiving layer had an average particle size of 1
In the inkjet recording material of Comparative Example 5 in which the diameter was changed to 2.5 μm and the spherical organic particles were omitted, continuous transportability on the back side, scratch resistance on the front side, and ink bleeding on the back side were deteriorated. In Example 12, the ink jet recording material of Comparative Example 6 in which polyvinyl alcohol in the uppermost layer in the ink receiving layer on the back side was replaced with gelatin to increase the compounding amount, and boric acid and spherical organic particles were omitted, the back printing after front printing was performed. The transportability and ink bleeding deteriorated, and the writing property on the back side deteriorated. Comparative Example 7 in which the lower layer of the ink receiving layer on the back side of Example 13 was eliminated and spherical inorganic fine particles were removed from the composition of the uppermost layer to increase the coating amount, the inkjet recording materials of Comparative Examples 2, 5 and 7 were: The print density of the printed product used for the evaluation of ink bleeding of the ink receiving layer on the back side was greatly reduced as compared with the inkjet recording materials of Examples 1 to 12.

[0115]

EFFECTS OF THE INVENTION According to the present invention, the ink receiving layer on one side has high gloss, and photo-like image quality with good scratch resistance and good touch can be obtained, and the other side has no surface defects during coating, It has high ink absorbency and less bleeding when printed in color.
The strength of the coating layer is high, it has high writing performance, and even when printing a large number of sheets in succession, there is no problem in transportability such as blank feed, even when printing on both sides even when printing later. An ink jet recording material that can be used for postcards and has no problem of transportability such as double feeding was obtained.

Claims (14)

[Claims] 1. An average primary particle size of 1 on one surface of a water resistant support.
An ink jet recording material having at least one ink receiving layer (A) containing inorganic fine particles of 00 nm or less and a hydrophilic binder, and an ink receiving layer (B) provided on the other surface of the ink receiving layer (B). Is two or more layers, and the uppermost layer (B2) farthest from the water resistant support has an average particle size of 1 to
The lower layer (B1) close to the water-resistant support has an average primary particle size of 100 nm, containing 10 μm of inorganic particles, a polyvinyl alcohol compound, and at least one kind of spherical organic particles having an average particle size larger than the inorganic particles. An inkjet recording material comprising the following inorganic fine particles and a hydrophilic binder. 2. Inorganic fine particles in the lower layer B1 of the ink receiving layer A and the ink receiving layer B have an average primary particle size of 3 to 5
0 nm vapor phase silica, colloidal silica, alumina,
And at least one kind of alumina hydrate, The inkjet recording material according to claim 1, wherein 3. The ink receiving layer A contains at least one kind of spherical particles having an average particle size of 1 to 7 μm and at least one kind of spherical particles having an average particle size of 10 μm or more in the uppermost layer farthest from the water resistant support. The ink jet recording material according to claim 1 or 2, wherein 4. A resin coating in which the surface of the base paper on which the ink receiving layer A is provided is coated with a thermoplastic resin and the surface on which the ink receiving layer B is provided of the water resistant support is not coated with a thermoplastic resin. The inkjet recording material according to any one of claims 1 to 3, which is a paper. 5. The average primary particle size is 1 on one side of the water resistant support.
An ink jet recording material comprising at least one layer of an ink receiving layer (C) containing inorganic fine particles of 00 nm or less and a hydrophilic binder, and an ink receiving layer (D) on the other surface of the ink receiving layer (D). Is 3 layers or more, and the uppermost layer (D3) farthest from the water resistant support has an average particle size of 1
Inorganic fine particles having a mean particle size of more than 0.1 μm and less than 1 μm in the intermediate layer (D2) containing inorganic fine particles of 10 μm and a polyvinyl alcohol compound and closer to the water resistant support than the uppermost layer D3 and a hydrophilic binder. Containing the intermediate layer D2
An inkjet recording material, wherein the lower layer (D1) closer to the water-resistant support contains inorganic fine particles having an average primary particle size of 100 nm or less and a hydrophilic binder. 6. The solid content ratio (E3) of the polyvinyl alcohol compound contained in the uppermost layer D3 of the ink receiving layer D to the inorganic fine particles is 30 to 80% by mass, and the intermediate layer D2.
When the solid content ratio (E2) of the hydrophilic binder contained in the inorganic fine particles is 20 to 60% by mass, and the solid content ratio (E1) of the hydrophilic binder contained in the lower layer D1 is 10 to 40% by mass. The recording material for inkjet according to claim 5, wherein 7. The inkjet recording material according to claim 6, wherein the relationship among E3, E2, and E1 satisfies the following formula (1). Formula (1) E3 ≧ E2 ≧ E1 8. The inorganic primary particles in the ink receiving layer C and the lower layer D1 of the ink receiving layer D have an average primary particle diameter of 3 to 5.
0 nm vapor phase silica, colloidal silica, alumina,
And at least one kind of alumina hydrate, The ink jet recording material according to claim 5, wherein 9. The ink receiving layer C contains at least one kind of spherical particles having an average particle size of 1 to 7 μm and at least one kind of spherical particles having an average particle size of 10 μm or more in the uppermost layer farthest from the water resistant support. The inkjet recording material according to any one of claims 5 to 8, wherein 10. The uppermost layer D3 of the ink receiving layer D,
The inkjet recording material according to claim 5, further comprising at least one kind of spherical organic particles having an average particle size larger than the average particle size of the contained inorganic fine particles. 11. A resin coating in which the surface of the base paper on which the ink receiving layer C is provided is coated with a thermoplastic resin, and the surface on which the ink receiving layer D is provided is not coated with a thermoplastic resin in the water resistant support. It is paper, It is characterized by the above-mentioned.
0. The recording material for inkjet according to any one of 0. 12. A water-resistant support is provided with at least one layer of an ink receiving layer (G) containing inorganic fine particles having an average primary particle size of 100 nm or less and a hydrophilic binder on one side, and the ink receiving layer (H) on the other side. ), The ink receiving layer (H) has two or more layers,
The uppermost layer (H2) farthest from the water resistant support contains a polyvinyl alcohol compound and spherical inorganic fine particles having an average particle size of 1 μm or more, and the lower layer (H1) close to the water resistant support has an average primary particle size of 100 nm or less. An inkjet recording material comprising fine particles and a hydrophilic binder. 13. The ink jet recording material according to claim 12, wherein 10 to 80% by mass of the inorganic fine particles contained in the ink receiving layer H2 are spherical inorganic fine particles. 14. A resin coating in which the surface of the base paper on which the ink receiving layer G is provided is coated with a thermoplastic resin and the surface on which the ink receiving layer H is provided of the water resistant support is not coated with a thermoplastic resin. 13. Paper which is paper,
Or the recording material for inkjet as described in 13 above.