JP2005001373A - Inkjet recording material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording material, on the surface of a gloss developing layer of which no crack develops and both the color developing properties and absorbability of pigmented ink are equipped in combination. <P>SOLUTION: In the inkjet recording material formed by providing an ink accepting layer and the gloss developing layer at least on one side of a support in the order named, at least 50 volume % of the total volume of inorganic particles included in the ink accepting layer have particle diameter of 1.2-15 μm and the gloss developing layer includes at least inorganic ultrafine particles, a hydrophilic binder and boric acid or borate and the dry coating amount of the gloss developing layer in the inkjet recording material is 20-120 mass % of that of the ink accepting layer. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an ink jet recording material, and more particularly to an ink jet recording material suitable for pigment ink.

  In recent years, due to remarkable progress of inkjet printers and plotters, full-color and high-definition images can be easily obtained.

  The ink jet recording system records images, characters, and the like by causing micro droplets of ink to fly and adhere to a recording material such as paper according to various operating principles. Inkjet printers and plotters have rapidly become popular in recent years in various applications as hard copy creation devices for image information such as letters and various graphics created by computers. In particular, color images formed by the multi-color ink jet method can be recorded inferior to multi-color printing by the plate making method and printing by the color photographic method, and in applications where the number of copies is small. Are being widely applied because they are less expensive than printing and photographic techniques.

  Furthermore, with the diversification of uses, it is increasingly used for large-format posters, POP art, and drafting. In these applications, since the high sharpness of the ink jet is utilized and the color is excellent, a good image can be obtained and the advertising effect is great. Application to these is because it is possible to easily obtain an image with excellent image reproducibility and color reproducibility such as sharpness and color at the personal computer level, which is also a reason for using a lot of ink jet recording materials. .

  Due to the high performance and diversification of applications of these ink jet recording apparatuses, the need for ink jet recording has increased, and as a result, the characteristics and requirements required for the recording apparatus or ink jet recording material have become considerably high. For example, in the case of applications such as large posters, POP art, and photographic image output, the applications are for indoor / outdoor exhibitions and personal record storage, and thus weather resistance and image storage stability are required more than before. It is like that. In response to such demands, improvements in inks and ink jet recording materials have progressed, and considerably better storage stability has been obtained than in the past. However, in particular, the light resistance has not yet reached the level of silver salt photography, and the current situation is that the requirements are not satisfied.

  In order to satisfy such demands, pigment type inks have recently been used. It is known that the pigment ink has little light deterioration and does not re-dissolve with water, so that the weather resistance and the image storage stability are improved as compared with the dye type ink. However, since the color material pigment in the ink is insoluble in the solvent unlike the dye, it is necessary to stably disperse the color material pigment in the ink, and the ratio of the color material pigment in the ink cannot be easily increased. In addition, the coloring efficiency is not high like dye ink, and it is difficult to obtain a clear color.

  Therefore, the demand for ink jet recording materials is inevitably increasing. As a method for improving the absorbability of the pigment ink, it is conceivable to increase the thickness of the ink receiving layer to be coated on the support. Ink absorption is improved by this method, but the color develops because the ink penetrates deeply in the direction of the base paper. As described above, in the case of the pigment ink, it is difficult to obtain a clear color compared with the dye ink, so that the color developability is significantly lowered when the ink penetrates deeply. Furthermore, the decrease is further remarkable in the ink jet recording material having no ink receiving layer.

  For these ink jet recording materials, for the purpose of obtaining good ink jet recording performance, an ink jet recording material containing inorganic ultrafine particles has been proposed, and synthetic silica mainly having a primary particle diameter of 3 nm to 30 nm is used by a gas phase method. An ink jet recording material is disclosed (for example, see Patent Documents 1 and 2).

  In addition, a method of providing a coating layer containing inorganic ultrafine particles, polyvinyl alcohol and boric acid or a salt thereof on a non-absorbable support has been proposed (see, for example, Patent Documents 3 to 5). According to this method, when the dry coating amount of the coating layer is small, the coating layer can be obtained without causing cracks, but the ink absorbency is low and the ink absorbability is improved. In order to provide a thick coating layer, the coating solution is heated after being heated to room temperature or higher, or cooled after coating, and the coating solution is set on a support, and a viscosity increasing agent and inorganic ultrafine particles or After forming a strong bond with the binder, drying must be performed, so that the production efficiency is lowered, and even if the coating layer is thickened, the ink absorbency may not be satisfactory.

  In order to improve the ink absorbency, a porous silica layer is provided in the lower layer, an ink jet recording material having an alumina or alumina hydrate-containing layer in the upper layer, an absorbent pigment-containing layer in the lower layer, and pseudoboehmite in the outermost layer. Recording materials have been proposed (see, for example, Patent Documents 6 and 7).

  When forming such a coating liquid for the glossy layer containing inorganic ultrafine particles on the lower layer made of porous silica, the inorganic ultrafine particle component in the glossy layer drops into the lower layer. As a result, the surface of the glossy layer tends to crack, and the surface gloss is lowered.When dye ink is used in ink jet recording, the ink absorbability is improved due to the large number of cracks. In the case of a pigment ink having a lower color developability than that of the ink, the pigment ink characteristics may deteriorate due to the pigment ink falling into the cracks.

In addition, an ink jet recording material has been proposed in which an undercoat layer containing a basic material is provided in order to improve the color developability of the ink, and a porous image receiving layer made of fumed alumina is formed thereon (for example, a patent) However, since the primer layer containing a basic material is only a polymer component such as gelatin, the polymer component swells due to moisture in the porous image receiving layer during the application of the porous image receiving layer. Since the distortion occurs when the quality image receiving layer is dried, cracks may occur in the porous image receiving layer, and the glossiness and pigment ink characteristics may deteriorate.
JP-A-10-203006 (page 3-9) JP-A-8-174992 (page 3-6) JP-A-7-76161 (page 2-3) JP-A-10-193777 (page 2-10) JP 2002-2094 A (page 2-10) JP-A-6-55829 (page 2-3) JP-A-7-89216 (page 2-6) JP 2002-331746 A (page 3-5)

  An object of the present invention is to provide an ink jet recording material that has both high absorbability and color developability of pigment ink without causing cracks on the surface of the glossy layer.

  As a result of diligent research to achieve the above object, in an ink jet recording material formed by sequentially applying and drying the ink receiving layer and the gloss developing layer on at least one side of the support, the ink 50% by volume or more of the total volume of inorganic particles contained in the receiving layer is a particle diameter of 1.2 μm or more and 15 μm or less, and the glossy layer contains at least inorganic ultrafine particles, a hydrophilic binder and boric acid or borate. This was solved by the ink jet recording material containing the glossy layer and having a dry coating amount of 20% by mass to 120% by mass of the dry coating amount of the ink receiving layer.

  The oil absorption of the inorganic particles measured by JIS-K5101 is preferably 160 ml / 100 g or more and 320 ml / 100 g or less.

  More preferably, the pH of the ink receiving layer coating solution is 8 or more and 11 or less, and the pH of the glossy layer coating solution is 3 or more and 5 or less.

  More preferably, the inorganic ultrafine particles are alumina hydrate.

  In particular, the glossy layer preferably contains basic polyaluminum hydroxide.

  The ink jet recording material of the present invention has no cracks on the surface of the glossy layer, has high surface gloss, and has both the absorbability and color developability of the pigment ink.

  Hereinafter, the ink jet recording material of the present invention will be described in detail.

  As a method for improving the suitability of the pigment ink, the present inventors have separated the solvent in the pigment ink and the color material pigment, distributed the color material pigment in the pigment ink in the vicinity of the surface of the glossy layer, and the solvent content in the ink. We thought that it was possible to improve the high absorbency and color developability by penetrating into the receiving layer.

  Accordingly, as a result of intensive studies on the method of eliminating the cracks on the surface of the glossy layer and separating the colorant pigment component and the solvent component in the pigment ink, the present inventors have determined that the total volume of inorganic particles contained in the ink receiving layer is 50%. Volume% or more has a particle diameter of 1.2 μm or more and 15 μm or less, and the gloss developing layer contains at least inorganic ultrafine particles, a hydrophilic binder and boric acid or borate, and the dry coating amount of the gloss developing layer is ink. By making the dry coating amount of the receiving layer 20% by mass or more and 120% by mass or less, it becomes possible to provide a glossy layer without cracks on the highly absorbing ink receiving layer, and effectively color the pigment ink. The pigment ink is separated into the pigment and the solvent, and the solvent of the separated pigment ink is efficiently absorbed by the ink receiving layer, and the colorant pigment in the pigment ink is distributed near the surface of the glossy layer. It has been found that an ink jet recording material having both high absorbency and color developability can be produced.

  The pigment ink as used in the present invention is a recording liquid comprising a colorant pigment, a dispersion solvent, other additives, and the like, and is not particularly limited. Further, the dispersion solvent may be any of water and various organic solvents.

  The ink receiving layer according to the present invention will be described below.

  In the present invention, volume% represents the ratio of the total volume of inorganic particles having a particle diameter in a specified range to the total volume of inorganic particles contained in the ink receiving layer.

  The average particle size and volume% in the present invention are obtained from particle size distribution data measured by a particle size distribution meter using a laser diffraction / scattering method.

  In the present invention, the inorganic particles contained in the ink receiving layer are particles having a volume of 50 volume% or more of the total volume of the inorganic particles of 1.2 μm or more and 15 μm or less. In order to improve the gloss and color developability of the gloss developing layer surface while maintaining the ink absorbency, 50% by volume or more of the total volume of the inorganic particles contained in the ink receiving layer is 1.5 μm or more and 10 μm or less. preferable. More preferably, the inorganic particles having a particle size of 1.5 μm or more and 10 μm or less are 65% by volume or more of the total volume of the inorganic particles contained in the ink receiving layer. By setting it within this range, it is preferable that ink absorbability can be more efficiently obtained without causing cracks on the surface of the glossy layer by preventing the glossy layer from dropping into the lower layer of the inorganic ultrafine particles.

  The inorganic pigment contained in the ink receiving layer preferably has an oil absorption measured by JIS-K5101 of 160 ml / 100 g or more and 320 ml / 100 g or less, more preferably 170 ml / 100 g or more and 300 ml / 100 g or less, more preferably 190 ml. / 100g or more and 280ml / 100g or less. When the gloss developing layer is applied within this range, moisture in the gloss developing layer coating liquid is appropriately absorbed, so that a thickening effect can be obtained by increasing the concentration of the gloss developing layer coating liquid. Since the generation of cracks in the surface of the glossy layer can be suppressed by preventing the inorganic ultrafine particles from falling into the lower layer, the surface gloss of the glossy layer is preferably improved.

  Inorganic pigments mixed in the inorganic pigment contained in the ink receiving layer even when two or more of the same kind of inorganic particles having different properties such as average secondary particle diameter and oil absorption amount are used. By making the oil absorption amount within the above range, ink absorbability can be more efficiently obtained without causing cracks on the surface of the glossy layer.

  Examples of inorganic particles used in the ink receiving layer include light calcium carbonate, heavy calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, White inorganic pigments such as diatomaceous earth, calcium silicate, magnesium silicate, synthetic amorphous silica, colloidal silica, colloidal alumina, pseudoboehmite, aluminum hydroxide, alumina, lithopone, zeolite, hydrous halloysite, magnesium carbonate, magnesium hydroxide, etc. Can be used. Among the inorganic pigments described above, porous inorganic pigments are preferable, and examples thereof include porous amorphous synthetic silica and porous magnesium carbonate, and porous synthetic amorphous silica having a large pore volume is particularly preferable.

In the present invention, the dry coating amount of the ink receiving layer is 3 to 30 g / m ² , more preferably 5 to 20 g / m ² , and further preferably 7 to 20 g / m ² . By setting the dry coating amount within this range, it is preferable because ink absorbency can be obtained more efficiently without reducing glossiness.

  In the present invention, in addition to the above, the ink receiving layer may contain a cationic compound in addition to inorganic particles, an adhesive, and the like, as well as an inkjet recording method in which pigment ink and dye ink are used in combination. it can. In addition, as additives, dye fixing agents, pigment dispersants, thickeners, fluidity improvers, surfactants, antifoaming agents, antifoaming agents, mold release agents, foaming agents, penetrating agents, colored dyes, Coloring pigments, fluorescent whitening agents, ultraviolet absorbers, antioxidants, preservatives, antibacterial agents, water resistance agents, wetting power enhancers, dry paper strength enhancing agents, and the like can be appropriately blended.

  Examples of the binder used in the ink receiving layer of the present invention include starch derivatives such as oxidized starch, etherified starch, and phosphate esterified starch; cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose; casein, gelatin, soybean protein, and polyvinyl Polyvinyl alcohol derivatives such as alcohol or silyl-modified polyvinyl alcohol, polyvinyl pyrrolidone, maleic anhydride resin, styrene-butadiene copolymer, conjugated diene copolymer latex such as methyl methacrylate-butadiene copolymer, acrylic ester and methacrylic ester Acrylic copolymer latex such as acid ester polymer or copolymer, vinyl copolymer latex such as ethylene vinyl acetate copolymer, or a variety of these copolymers Functional group-modified copolymer latex with functional group-containing monomers such as ruxoxy groups, aqueous adhesives such as thermosetting synthetic resins such as melamine resin and urea resin, acrylic acid esters such as polymethyl methacrylate, Examples of the polymer or copolymer resin latex, polyurethane resin, unsaturated polyester resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, and alkyd resin latex may be used, and one or more of these may be used. Of these binders, polyvinyl alcohol and polyvinyl alcohol derivatives such as silyl-modified polyvinyl alcohol are preferable from the viewpoint of adhesive strength.

  As a compounding quantity of the binder used for the ink receiving layer of this invention, it is 5-60 mass parts with respect to 100 mass parts of total of inorganic particle, Preferably, it is 10-50 mass parts.

  Next, the glossy expression layer according to the present invention will be described.

  The inorganic ultrafine particles in the ink jet recording material of the present invention refer to inorganic fine particles having an average secondary particle diameter of 500 nm or less, for example, JP-A-1-97678, JP-A-2-275510, and JP-A-3-281383. 3-285814, 3-285815, 4-92183, 4-267180, 4-27517, etc., and other alumina hydrates such as pseudoboehmite sol. Vapor phase alumina described in JP-A-8-72387, JP-A-60-219083, 61-19389, 61-188183, 63-178074, JP-A-62-178074 Colloidal silica as described in JP-A-5-51470, JP-B-4-19037, JP-A-62-28 No. 787, silica / alumina hybrid sol, and gas phase method silica as described in JP-A-10-119423 and JP-A-10-217601 are dispersed with a high-speed homogenizer. Silica sol, wet silica pulverized to an average secondary particle size of less than 500 nm, other smectite clays such as hectite and montmorillonite (JP-A-7-81210), zirconia sol, chromia sol, yttria sol, ceria sol, iron oxide sol, Typical examples include zircon sol, aluminum oxide sol, and antimony oxide sol.

  Among the above-mentioned inorganic ultrafine particles, alumina hydrate is particularly preferable. When alumina hydrate is used, cracks are less likely to occur on the surface of the glossy layer, and the separation performance of the pigment ink and the solvent component of the pigment ink can be improved.

The alumina hydrate used in the present invention can be represented by the following general formula. Al ₂ O ₃ · nH ₂ O alumina hydrates are classified into gypsite, vialite, norstrandite, boehmite, boehmite gel (pseudoboehmite), diaspore, amorphous amorphous, etc., depending on the composition and crystal form. The In particular, in the above formula, when the value of n is 1, it represents an alumina hydrate having a boehmite structure, and when n is more than 1 and less than 3, it represents an alumina hydrate having a pseudo boehmite structure, where n is 3 or more represents an amorphous alumina hydrate. In particular, the preferred alumina hydrate for the present invention is an alumina hydrate having a pseudo boehmite structure in which at least n is more than 1 and less than 3.

  In order to stabilize the dispersion of alumina hydrate, various acids are usually added to the dispersion. Examples of such acids include nitric acid, hydrochloric acid, hydrobromic acid, acetic acid, formic acid, ferric chloride, aluminum chloride and the like, but the present invention is not limited thereto.

  The shape of the alumina hydrate used in the present invention may be any of a flat plate shape, a fiber shape, a needle shape, a spherical shape, a rod shape, and the like, and a preferable shape is a flat shape from the viewpoint of ink absorbability. The plate-like alumina hydrate has an average aspect ratio of 3 to 8, and preferably an average aspect ratio of 3 to 6. The aspect ratio is expressed as the ratio of the “diameter” to the “thickness” of the particles. Here, the diameter of the particle represents the diameter of a circle equal to the projected area of the particle when the alumina hydrate is observed with an electron microscope.

  The alumina hydrate used in the present invention can be produced by a known method such as hydrolysis of aluminum alkoxide such as aluminum isopropoxide, neutralization of aluminum salt with alkali, hydrolysis of aluminate. The physical properties of alumina hydrate, such as particle size, pore size, pore volume, and specific surface area, should be controlled by conditions such as precipitation temperature, aging temperature, aging time, solution pH, solution concentration, and coexisting compounds. Can do.

  As methods for obtaining alumina hydrates from alkoxides, JP-A-57-88074, JP-A-62-256321, JP-A-4-275717, JP-A-6-64918, JP-A-7-10535, JP-A-7-267633, US Pat. No. 2,656,321 and the like disclose a method for hydrolyzing aluminum alkoxide. These aluminum alkoxides include isopropoxide, 2-butoxide and the like.

  The alumina hydrate used in the present invention is preferably an alumina hydrate having an average primary particle size of 3 nm to 25 nm. A particularly preferable average primary particle diameter is 5 nm to 20 nm. Moreover, it is preferable to set it as 50 nm-200 nm as an average secondary particle diameter which these connected.

  Examples of the hydrophilic binder used in the glossy layer of the present invention include polyvinyl alcohol containing modified products such as silanol modification, starch and modified products thereof, gelatin and modified products thereof, casein, pullulan, gum arabic, karaya gum, albumin and the like. Examples thereof include natural polymer resins or derivatives thereof, vinyl polymers such as polyacrylamide and polyvinylpyrrolidone, polyethyleneimine, polypropylene glycol, polyethylene glycol, maleic anhydride or copolymers thereof, and can be used alone or in combination. However, the present invention is not limited to these. The total amount of these hydrophilic binders is preferably 4 to 25% by mass, particularly 6 to 20% by mass, based on the inorganic ultrafine particles.

  As the hydrophilic binder used in the glossy layer of the present invention, polyvinyl alcohol or polyvinyl alcohol derivatives such as silyl-modified polyvinyl alcohol are preferable from the viewpoint of adhesive strength. Polyvinyl alcohol having a degree of polymerization of 2000 or more and a degree of saponification of 88% or more and less than 96% is particularly preferred from the viewpoints of miscibility with alumina hydrate, adjustment of the coating liquid viscosity, and film-forming properties.

As boric acid used in the present invention, not only orthoboric acid but also metaboric acid and hypoboric acid can be used. The borate is preferably a soluble salt such as Na ₄ B ₄ O ₇ .10H ₂ O, NaBO ₂ .4H ₂ 0, K ₂ B ₄ O ₇ .5H ₂ O, NH ₄ HB ₄ O. _{7 · 3H 2 O, NH 4} BO 2 , and the like, but the present invention is not limited thereto.

The amount of boric acid or borate added is 1 to 15% by mass, preferably 3 to 10% by mass, based on the hydrophilic binder in terms of H ₃ BO ₃ .

  In the present invention, in order to efficiently separate the colorant pigment and the solvent content in the pigment ink by the gloss developing layer, the dry coating amount of the gloss developing layer is 20% by mass or more of the dry coating amount of the ink receiving layer. It is 120 mass% or less. More preferably, it is 40 mass% or more and 100 mass% or less.

  In the present invention, it is preferable to add basic polyaluminum hydroxide to the glossy layer in order to improve the separation performance of the colorant pigment and solvent in the pigment ink.

The basic polyaluminum hydroxide compound has a main component represented by the following general formula 1, 2, or 3, for example, [Al ₆ (OH) ₁₅ ] ³⁺ , [Al ₈ (OH) ₂₀ ] ⁴⁺ , [ It is a water-soluble polyaluminum hydroxide that stably contains basic and high-molecular polynuclear condensed ions such as Al ₁₃ (OH) ₃₄ ] ⁵⁺ , [Al ₂₁ (OH) ₆₀ ] ³⁺ , and the like.

[Al ₂ (OH) _n Cl _6-n ] _m , [Al (OH) ₃ ] _n AlCl ₃ , Al _n (OH) _m Cl _(3n-m) (m is an integer satisfying the relationship 0 <m <3n And)

  These are marketed under the name of polyaluminum chloride (PAC) from Taki Chemical Co., Ltd., polyaluminum hydroxide (Paho) from Asada Chemical Co., Ltd., and Purachem WT from Riken Green Co., Ltd. Are easily available.

In the present invention, the content of the glossy layer of the basic polyaluminum hydroxide ^{is, 0.1g / m 2 ~5g / m} 2, and preferably from ^{0.2g / m 2 ~3g / m 2} .

  Further, the glossy layer of the present invention includes other additives such as a cationic dye fixing agent, a pigment dispersant, a thickener, a fluidity improver, a viscosity stabilizer, a pH adjuster, a surfactant, an antifoaming agent. Agent, foam suppressor, mold release agent, foaming agent, penetrating agent, coloring dye, coloring pigment, fluorescent brightening agent, ultraviolet absorber, antioxidant, leveling agent, antiseptic, antibacterial agent, waterproofing agent, wetting A paper strength enhancer, a dry paper strength enhancer, and the like can be appropriately added as long as the object of the present invention is not impaired.

  In the present invention, the ink receiving layer and the gloss developing layer are provided by coating and drying a coating liquid for the ink receiving layer and the gloss developing layer on a support.

  In the present invention, the pH of the ink receiving layer coating solution is from 8 to 11, and the pH of the glossy layer coating solution is from 3 to 5. Preferably, the pH of the ink receiving layer coating solution is 8.5 to 11, and the pH of the glossy layer coating solution is 3 to 4.5. By setting it in this range, the drop of the binder and inorganic ultrafine particles in the glossy expression layer to the ink receiving layer is reduced and the surface gloss is improved, which is preferable.

  As long as it is compatible with the ink receiving layer coating liquid, any basic material can be used for the ink receiving layer coating liquid used in the present invention, and it should be added to the ink receiving layer coating liquid. Then, the pH of the ink receiving layer is appropriately adjusted. Examples of the basic material used include hydroxides such as aluminum hydroxide and sodium hydroxide, carbonate compounds such as sodium carbonate, amine compounds, and ammonia.

  As long as it is compatible with the gloss developing layer coating liquid, any acidic material can be used for the gloss developing layer coating liquid used in the present invention, and by adding it to the coating liquid of the gloss developing layer coating liquid. Then, the coating solution pH of the glossy layer is appropriately adjusted. Examples of the basic material used include inorganic acids and organic acids such as nitric acid, hydrochloric acid, hydrobromic acid, acetic acid, formic acid, lactic acid, citric acid, ferric chloride, and aluminum chloride.

  In the present invention, when the ink receiving layer and the gloss developing layer are provided, a coating method is not particularly limited, and a known coating method can be used. For example, coating with various devices such as air knife coater, curtain coater, slide lip coater, die coater, blade coater, gate roll coater, bar coater, rod coater, roll coater, bill blade coater, short dwell blade coater, size press, etc. can do.

  In the present invention, the method of drying after coating the coating liquid is not particularly limited, and a known drying method can be used. In particular, a method of drying by heating, such as a method of blowing hot air or a method of irradiating infrared rays, is used. The productivity is good and it is preferably used.

  In the present invention, after the ink receiving layer or gloss developing layer is coated and dried, it may be smoothed by a calendar process for the purpose of controlling flattening or further increasing the surface gloss. Examples of the calendar processing device at that time include a gloss calendar, a super calendar, and a soft calendar. Moreover, a glossy surface can be formed using a known cast coating method.

  Thus, it is preferable that the 75 degree specular glossiness measured by JIS-P8142 of the inkjet recording material which provided the gloss expression layer on the ink receiving layer on a support body is 40% or more. More preferably, it is 50% or more.

  The support used in the present invention may be transparent, translucent or opaque, such as paper, various nonwoven fabrics, woven fabric, synthetic resin film, synthetic resin laminated paper, synthetic paper, metal foil, ceramic paper, glass plate, etc. Alternatively, a composite sheet combining these can be arbitrarily used depending on the purpose, but is not limited thereto.

  Examples of paper used as a support in the present invention include chemical pulps such as LBKP and NBKP, mechanical pulps such as GP, PGW, RMP, TMP, CTMP, CMP, and CGP, and wood pulp such as waste paper pulp such as DIP and conventionally known pulps. The main component is a pigment, and a binder, a sizing agent, a fixing agent, a yield improver, a cationizing agent, a paper strength enhancer and the like are mixed using one or more additives, and a long net paper machine, circular net paper machine, Paper manufactured with various devices such as twin wire paper machines, paper with size press or anchor coat layer with starch, polyvinyl alcohol, etc., art paper with coat layer on top Coated paper such as paper and cast coated paper is also included. Such a paper and coated paper may be provided with the coating layer in the present invention as they are, or a calendar device such as a machine calendar, a TG calendar, or a soft calendar may be used for the purpose of controlling flattening.

  EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. In the examples, “parts” and “%” indicate parts by mass and mass% unless otherwise specified.

  In each ink-receiving layer coating liquid used in the examples, the ratio of the inorganic particles having a particle diameter of 1.2 μm to 15 μm contained in the ink-receiving layer to the total volume of the inorganic particles is determined by the laser light diffraction / scattering method (Microtrack 9320HRA, manufactured by Leeds & Northrup).

  Moreover, the oil absorption amount of the inorganic particles used for each ink receiving layer was measured according to the method of JIS-K5101.

<Support 1>
100 parts of wood pulp consisting of 70 parts of LBKP with a freeness of 450 ml CSF and 30 parts of NBKP with a freeness of 450 ml CSF, 5 parts of a pigment having a ratio of light calcium carbonate / heavy calcium carbonate / talc of 30/35/35, a commercially available alkyl ketene dimer After preparing 0.1 part, 0.03 part of commercially available cationic acrylamide, 1.0 part of commercially available cationized starch, and 0.5 part of sulfuric acid band, the paper was made with a net paper machine at a basis weight of 105 g / m ^2. A support 1 was obtained.

<Support 2>
A 1: 1 mixture of hardwood bleached kraft pulp (LBKP, whiteness 90%) and softwood bleached sulfite pulp (NBSP, whiteness 90%) was beaten to 300 ml with Canadian Standard Freeness to prepare a pulp slurry. The sizing agent is alkylketene dimer 0.5% to pulp, polyacrylamide is 1.0% by weight to pulp, and cationized starch is 2.0% to pulp, polyamide epichlorohydrin resin as a sizing agent. 0.5% to pulp was added and diluted with water to give a 1% slurry. This slurry is made with a long paper machine so as to have a basis weight of 170 g / m ² to prepare a paper substrate, and the density of the surface of the paper substrate (the side on which the ink receiving layer and the gloss developing layer are provided) is 0. A polyethylene resin composition in which anatase-type titanium is uniformly dispersed at a rate of 5% with respect to 918 g / cm ³ of low-density polyethylene 100% resin is melted at 320 ° C. to a thickness of 20 μm at 200 m / min. Thus, a support 2 was prepared by coating a resin having a glossiness of 60% using a cooling roll that had been extrusion-coated and finely roughened.

<Ink-receiving layer coating solution 1>
100 parts of synthetic amorphous silica (average particle size 1.2 μm, oil absorption 180 ml / 100 g, ratio of inorganic particles having a particle size of 1.2 to 15 μm: 50% by volume) is dispersed in 400 parts of water using a homogenizer, This was mixed with 250 parts of a 10% polyvinyl alcohol (completely saponified, degree of polymerization 1700) aqueous solution to prepare an ink-receiving layer coating solution 1 having a solid concentration of 16.7% and a pH of 6.4.

<Ink-receiving layer coating liquid 2>
100 parts of synthetic amorphous silica (average particle size 1.5 μm, oil absorption 130 ml / 100 g, ratio of inorganic particles 1.2 to 15 μm in particle size: 98% by volume) is dispersed in 400 parts of water using a homogenizer, This was mixed with 250 parts of a 10% polyvinyl alcohol (completely saponified, degree of polymerization 1700) aqueous solution to prepare an ink-receiving layer coating solution 2 having a solid concentration of 16.7% and pH 6.1.

<Ink-receiving layer coating solution 3>
100 parts of synthetic amorphous silica (average particle diameter 4 μm, oil absorption 250 ml / 100 g, ratio of inorganic particles having a particle diameter of 1.2 to 15 μm: 100% by volume) is dispersed in 400 parts of water using a homogenizer. An ink receiving layer coating solution 3 having a solid content concentration of 16.7% and a pH of 6.2 was prepared by mixing 250 parts of a 10% polyvinyl alcohol (completely saponified, degree of polymerization 1700) aqueous solution.

<Ink-receiving layer coating solution 4>
100 parts of synthetic amorphous silica (average particle size 10 μm, oil absorption 200 ml / 100 g, ratio of inorganic particles 1.2 to 15 μm in particle size: 85% by volume) is dispersed in 400 parts of water using a homogenizer. 250 parts of a 10% polyvinyl alcohol (completely saponified, degree of polymerization 1700) aqueous solution was mixed to prepare an ink receiving layer coating solution 4 having a solid content concentration of 16.7% and pH 5.9.

<Ink-receiving layer coating solution 5>
100 parts of synthetic amorphous silica (average particle diameter 15 μm, oil absorption 240 ml / 100 g, ratio of inorganic particles having a particle diameter of 1.2 to 15 μm: 50% by volume) is dispersed in 400 parts of water using a homogenizer. An ink receiving layer coating solution 5 having a solid content concentration of 16.7% and pH 6.0 was prepared by mixing 250 parts of a 10% polyvinyl alcohol (completely saponified, degree of polymerization 1700) aqueous solution.

<Ink-receiving layer coating liquid 6>
50 parts of synthetic amorphous silica (average particle size 1.2 μm, oil absorption 180 ml / 100 g) and 50 parts of synthetic amorphous silica (average particle size 15 μm, oil absorption 240 ml / 100 g) were mixed to obtain a particle size of 1.2. A mixture prepared by adjusting the proportion of inorganic particles of ˜15 μm to 55 volume% of the total volume of inorganic particles is dispersed in 400 parts of water using a homogenizer, and 250 parts of a 10% polyvinyl alcohol (completely saponified, degree of polymerization 1700) aqueous solution is added thereto. Were mixed to prepare an ink receiving layer coating solution 6 having a solid content concentration of 16.7% and a pH of 6.2. The oil absorption of the synthetic amorphous silica mixture used was 205 ml / 100 g.

<Ink-receiving layer coating liquid 7>
100 parts of synthetic amorphous silica (average particle size 4 μm, oil absorption 160 ml / 100 g, ratio of inorganic particles having a particle size of 1.2 to 15 μm: 100% by volume) is dispersed in 400 parts of water using a homogenizer. An ink receiving layer coating solution 7 having a solid content concentration of 16.7% and a pH of 5.8 was prepared by mixing 250 parts of a 10% polyvinyl alcohol (completely saponified, degree of polymerization 1700) aqueous solution.

<Ink-receiving layer coating liquid 8>
100 parts of synthetic amorphous silica (average particle size 4 μm, oil absorption 340 ml / 100 g, ratio of inorganic particles having a particle size of 1.2 to 15 μm: 100% by volume) is dispersed in 400 parts of water using a homogenizer. 250 parts of a 10% polyvinyl alcohol (completely saponified, degree of polymerization 1700) aqueous solution was mixed to prepare an ink receiving layer coating solution 8 having a solid concentration of 16.7% and pH 6.1.

<Ink-receiving layer coating liquid 9>
50 parts of synthetic amorphous silica (average particle diameter 4 μm, oil absorption 160 ml / 100 g) and 50 parts of synthetic amorphous silica (average particle diameter 4 μm, oil absorption 340 ml / 100 g) are mixed to obtain a particle diameter of 1.2 to 15 μm. The amount of the inorganic particles adjusted to 100 volume% of the total volume of the inorganic particles is dispersed in 400 parts of water using a homogenizer, and mixed with 250 parts of a 10% aqueous solution of polyvinyl alcohol (fully saponified, degree of polymerization 1700). Then, an ink receiving layer coating liquid 9 having a solid concentration of 16.7% and a pH of 6.1 was prepared. The oil absorption of the mixture of synthetic amorphous silica used was 250 ml / 100 g.

<Ink-Receiving Layer Coating Liquid 10>
2 parts of sodium hydroxide, 100 parts of synthetic amorphous silica (average particle size 4 μm, oil absorption 250 ml / 100 g, ratio of inorganic particles having a particle size of 1.2 to 15 μm: 100% by volume) 400 parts of water using a homogenizer Into this, 250 parts of an aqueous solution of 10% polyvinyl alcohol (completely saponified, degree of polymerization 1700) was mixed to prepare an ink receiving layer coating liquid 10 having a solid content concentration of 16.9% and a pH of 10.5.

<Ink-receiving layer coating solution 11>
100 parts of high white primary kaolin (average particle size 1.6 μm, oil absorption 40 ml / 100 g, ratio of inorganic particles with particle size 1.2 to 15 μm: 80% by volume), 0.1 part of sodium polyacrylate with a homogenizer The mixture was dispersed in 150 parts of water, and 250 parts of an 8% oxidized starch aqueous solution was mixed therewith to prepare an ink-receiving layer coating liquid 11 having a solid concentration of 24% and a pH of 9.5.

<Ink-Receiving Layer Coating Liquid 12>
Using a homogenizer, 100 parts of light calcium carbonate (average particle diameter 2.0 μm, oil absorption 85 ml / 100 g, ratio of inorganic particles having a particle diameter of 1.2 to 15 μm: 65% by volume) and 0.2 part of sodium polyacrylate Dispersed in 100 parts of water and mixed with 42 parts of a 48% styrene-butadiene copolymer latex solid, an ink receiving layer coating solution 12 having a solids concentration of 49.7% and a pH of 9.8 was prepared.

<Ink-Receiving Layer Coating Liquid 13>
100 parts of synthetic amorphous silica (average particle size 0.8 μm, oil absorption 110 ml / 100 g, ratio of inorganic particles having a particle size of 1.2 to 15 μm: 20% by volume) is dispersed in 400 parts of water using a homogenizer, This was mixed with 250 parts of a 10% polyvinyl alcohol (completely saponified, degree of polymerization 1700) aqueous solution to prepare an ink receiving layer coating solution 13 having a solid concentration of 16.7% and a pH of 5.9.

<Ink-receiving layer coating solution 14>
100 parts of synthetic amorphous silica (average particle size 20 μm, oil absorption 230 ml / 100 g, ratio of inorganic particles having a particle size of 1.2 to 15 μm: 30% by volume) is dispersed in 400 parts of water using a homogenizer. 250 parts of a 10% polyvinyl alcohol (completely saponified, degree of polymerization 1700) aqueous solution was mixed to prepare an ink-receiving layer coating solution 14 having a solid concentration of 16.7% and a pH of 5.8.

<Synthesis of alumina hydrate>
The synthesis example of the alumina hydrate used for a glossiness expression layer is shown below. All the raw materials used were commercial products and were used as they were without any purification.

  Ion-exchanged water 1200 g and isopropyl alcohol 900 g were charged into a 3 L reactor and heated to 75 ° C. 408 g of aluminum isopropoxide was added, and hydrolysis was performed at 75 ° C. for 24 hours and at 95 ° C. for 4 hours. Thereafter, 24 g of acetic acid was added, and the mixture was stirred at 95 ° C. for 40 hours, and then concentrated so that the solid content concentration was 16% to obtain a white alumina hydrate dispersion.

When this sol was dried at room temperature and measured for X-ray diffraction, it showed a pseudo-boehmite structure. Further, when the average particle diameter was measured with a transmission electron microscope, it was about 20 nm and was an alumina hydrate having a flat pseudoboehmite structure with an aspect ratio of 6. Further, when the BET specific surface area, the average pore radius, the pore volume with a pore radius of 1 nm to 30 nm, and the pore volume with a pore radius of 2 nm to 10 nm were measured by a nitrogen adsorption / desorption method, 136 m ² / g, 0.8 nm, 0.54 ml / g, and 0.50 ml / g.

<Glossy layer coating liquid 1>
Using the above dispersion of 16% ultrafine alumina hydrate, 625 parts of alumina hydrate dispersion, 60 parts of 10% polyvinyl alcohol (saponification degree 88%, polymerization degree 2400) aqueous solution 4 parts 12.5 parts of boric acid aqueous solution was mixed to prepare a glossy layer coating solution 1 having a solid content of 15.3% and a pH of 3.9.

<Glossy layer coating liquid 2>
100 parts of vapor phase silica (average primary particle diameter 12 nm, average secondary particle diameter 120 nm, specific surface area 300 m ² / g by BET method, dispersity 0.3) are dispersed in 480 parts of water using a homogenizer. A 200% aqueous solution of 10% polyvinyl alcohol (saponification degree 88%, polymerization degree 2400) and 20 parts of a 4% boric acid aqueous solution were mixed to prepare a glossy layer coating solution 2 having a solid content of 15.1% and a pH of 4.7. .

<Glossy layer coating liquid 3>
Using the above dispersion of 16% ultrafine alumina hydrate, 625 parts of alumina hydrate dispersion, 60 parts of 10% polyvinyl alcohol (saponification degree 88%, polymerization degree 2400) aqueous solution 4 parts 12.5 parts of a boric acid aqueous solution and 20 parts of a 25% basic polyaluminum hydroxide aqueous solution were mixed to prepare a glossy layer coating solution 3 having a solid content of 15.5% and a pH of 3.5.

<Glossy layer coating liquid 4>
Using the above dispersion of 16% ultrafine alumina hydrate, 625 parts of alumina hydrate dispersion and 60 parts of 10% aqueous solution of polyvinyl alcohol (saponification degree 88%, polymerization degree 2400) were mixed. A glossy layer coating solution 4 having a solid content concentration of 15.5% and a pH of 3.9 was prepared.

<Glossy layer coating liquid 5>
Gas phase method silica (average primary particle size 12 nm, average secondary particle size 120 nm, specific surface area 300 m ² / g by BET method, dispersity 0.3) is dispersed in 500 parts of water using a homogenizer. 200 parts of 10% polyvinyl alcohol (saponification degree 88%, polymerization degree 2400) aqueous solution 200 parts, 4% boric acid aqueous solution 20 parts, 25% basic polyaluminum hydroxide aqueous solution 20 parts, solid content concentration 15.0%, pH 4 .2 glossy layer coating solution 5 was prepared.

<Glossy layer coating liquid 6>
Using the above dispersion of 16% ultrafine alumina hydrate, 625 parts of alumina hydrate dispersion and 41.7 parts of 48% styrene-butadiene copolymer latex were mixed to obtain a solid concentration. Glossy expression layer coating solution 6 having 17.6% and pH 4.1 was prepared.

<Glossy layer coating liquid 7>
40% colloidal silica (average primary particle size 80 nm) was mixed with 200 parts of a 10% polyvinyl alcohol (saponification degree 88%, polymerization degree 2400) aqueous solution and 10 parts of a 2% aqueous sodium borate solution to obtain a solid content concentration of 34.7%. The glossy layer 7 having a pH of 9.2 was prepared.

The ink-receiving layer coating liquid 1 was applied on the support 1 produced above with an air knife coater so as to have a dry solid content of 12 g / m ² and dried with hot air. Next, the glossy layer coating liquid 1 is applied on the ink receiving layer with an air knife coater so as to have a dry solid content of 9 g / m ² , dried by hot air, and then subjected to a soft calendering process. The ink jet recording material of Example 1 was produced.

  An ink jet recording material of Example 2 was produced under the same conditions as Example 1 except that the ink receiving layer coating liquid 2 was used instead of the ink receiving layer coating liquid 1 in Example 1.

  An ink jet recording material of Example 3 was produced under the same conditions as in Example 1 except that the ink receiving layer coating liquid 3 was used instead of the ink receiving layer coating liquid 1 in Example 1.

  An ink jet recording material of Example 4 was produced under the same conditions as in Example 1 except that the ink receiving layer coating liquid 4 was used instead of the ink receiving layer coating liquid 1 in Example 1.

  An ink jet recording material of Example 5 was produced under the same conditions as Example 1 except that the ink receiving layer coating liquid 5 was used instead of the ink receiving layer coating liquid 1 in Example 1.

  An ink jet recording material of Example 6 was produced under the same conditions as Example 1 except that the ink receiving layer coating liquid 6 was used instead of the ink receiving layer coating liquid 1 in Example 1.

  An ink jet recording material of Example 7 was produced under the same conditions as Example 1 except that the ink receiving layer coating liquid 7 was used instead of the ink receiving layer coating liquid 1 in Example 1.

  An ink jet recording material of Example 8 was produced under the same conditions as in Example 1 except that the ink receiving layer coating liquid 8 was used instead of the ink receiving layer coating liquid 1 in Example 1.

  An ink jet recording material of Example 9 was produced under the same conditions as Example 1 except that the ink receiving layer coating liquid 9 was used instead of the ink receiving layer coating liquid 1 in Example 1.

  An ink jet recording material of Example 10 was produced under the same conditions as in Example 1 except that the ink receiving layer coating liquid 10 was used instead of the ink receiving layer coating liquid 1 in Example 1.

  An ink jet recording material of Example 11 was produced under the same conditions as in Example 1 except that the ink receiving layer coating liquid 11 was used instead of the ink receiving layer coating liquid 1 in Example 1.

  An ink jet recording material of Example 12 was produced under the same conditions as Example 1 except that the ink receiving layer coating liquid 12 was used instead of the ink receiving layer coating liquid 1 in Example 1.

  The same conditions as in Example 1 except that the ink receiving layer coating liquid 3 was used instead of the ink receiving layer coating liquid 1 and that the gloss developing layer coating liquid 3 was used instead of the gloss developing layer coating liquid 1 in Example 1. Thus, an inkjet recording material of Example 13 was produced.

  The same conditions as in Example 1 except that the ink receiving layer coating liquid 9 was used instead of the ink receiving layer coating liquid 1 in Example 1, and that the gloss developing layer coating liquid 3 was used instead of the gloss developing layer coating liquid 1 Thus, an ink jet recording material of Example 14 was produced.

  The same conditions as in Example 1 except that the ink receiving layer coating liquid 10 was used instead of the ink receiving layer coating liquid 1 and that the gloss developing layer coating liquid 2 was used instead of the gloss developing layer coating liquid 1 in Example 1. Thus, an inkjet recording material of Example 15 was produced.

  The same conditions as in Example 1 except that the ink receiving layer coating solution 10 was used instead of the ink receiving layer coating solution 1 in Example 1, and the gloss developing layer coating solution 3 was used instead of using the gloss developing layer coating solution 1 Thus, an inkjet recording material of Example 16 was produced.

  The same conditions as in Example 1 except that the ink receiving layer coating liquid 12 was used instead of the ink receiving layer coating liquid 1 and that the gloss developing layer coating liquid 3 was used instead of the gloss developing layer coating liquid 1 in Example 1. Thus, an inkjet recording material of Example 17 was produced.

  An ink jet recording material of Example 18 was produced under the same conditions as in Example 16 except that Support 2 was used instead of Support 1 in Example 16.

  The same conditions as in Example 1 except that the ink receiving layer coating liquid 10 was used instead of the ink receiving layer coating liquid 1 in Example 1, and the gloss developing layer coating liquid 5 was used instead of the gloss developing layer coating liquid 1 Thus, an inkjet recording material of Example 19 was produced.

The dried solid content 12 g / m ² of the ink receiving layer 10 of Example 16 was changed to 17.5 g / m ² , and the dried solid content 9 g / m ² of the gloss developing layer coating liquid 3 was changed to a dried solid content of 3.5 g / m ² . An ink jet recording material of Example 20 was produced under the same conditions as Example 16 except for the change.

The dry solids 12 g / m ² of the ink-receiving layer 10 of Example 16 as a dry solid content 9.5 g / m ^2, glossy layer coating liquid 3 dry solids 9 g / m ² dry solids 11 An ink jet recording material of Example 21 was produced under the same conditions as in Example 16 except for changing to 4 g / m ² .

  The same conditions as in Example 1 except that the ink receiving layer coating solution 10 was used instead of the ink receiving layer coating solution 1 in Example 1, and the gloss developing layer coating solution 7 was used instead of the gloss developing layer coating solution 1 Thus, an inkjet recording material of Example 22 was produced.

(Comparative Example 1)
The ink-receiving layer coating liquid 10 is applied on the support 1 prepared above with an air knife coater and dried with hot air so as to have a dry solid content of 21 g / m ^2. An ink jet recording material of Comparative Example 1 was produced.

(Comparative Example 2)
On the support 1 produced above, the glossy layer coating liquid 1 is applied with an air knife coater so as to have a dry solid content of 21 g / m ² , dried by hot air, and then subjected to a soft calender treatment. Then, an inkjet recording material of Comparative Example 2 was produced.

(Comparative Example 3)
An ink jet recording material of Comparative Example 3 was prepared under the same conditions as in Example 1 except that the ink receiving layer coating liquid 13 was used instead of the ink receiving layer coating liquid 1 in Example 1.

(Comparative Example 4)
An ink jet recording material of Comparative Example 4 was produced under the same conditions as in Example 1 except that the ink receiving layer coating liquid 14 was used instead of the ink receiving layer coating liquid 1 in Example 1.

(Comparative Example 5)
The same conditions as in Example 1 except that the ink receiving layer coating liquid 10 was used instead of the ink receiving layer coating liquid 1 and that the gloss developing layer coating liquid 4 was used instead of the gloss developing layer coating liquid 1 in Example 1. Thus, an inkjet recording material of Comparative Example 5 was produced.

(Comparative Example 6)
The same conditions as in Example 1 except that the ink receiving layer coating liquid 13 was used instead of the ink receiving layer coating liquid 1 and that the gloss developing layer coating liquid 4 was used instead of the gloss developing layer coating liquid 1 in Example 1. Thus, an inkjet recording material of Comparative Example 6 was produced.

(Comparative Example 7)
The same conditions as in Example 1 except that the ink receiving layer coating liquid 3 was used instead of the ink receiving layer coating liquid 1 and that the gloss developing layer coating liquid 6 was used instead of the gloss developing layer coating liquid 1 in Example 1. Thus, an inkjet recording material of Comparative Example 7 was produced.

(Comparative Example 8)
The dry solid content 12 g / m ² of the ink receiving layer 3 of Example 3 was adjusted to 18.5 g / m ^2, and the dry solid content 9 g / m ² of the gloss developing layer coating liquid 1 was set to ² dry solid content. An ink jet recording material of Comparative Example 8 was produced under the same conditions as in Example 3 except that the amount was changed to 0.5 g / m ² .

(Comparative Example 9)
The dry solid content 12 g / m ² of the ink receiving layer 3 of Example 3 was adjusted to 8.4 g / m ^2, and the dry solid content 9 g / m ² of the gloss developing layer coating liquid 1 was set to the dry solid content 12. An inkjet recording material of Comparative Example 9 was produced under the same conditions as in Example 3 except that the amount was changed to 0.6 g / m ² .

Evaluation An image is printed on the ink jet recording materials produced in Examples 1 to 22 and Comparative Examples 1 to 9 using “MC-10000 (printer setting: MC glossy paper, clean)” manufactured by Seiko Epson Corporation. The presence or absence of cracks on the surface of the layer and the ink absorbability were evaluated. The image used for evaluation is composed of solid prints of black, cyan, magenta, yellow, blue, red, green, and a pattern in which white characters are provided.

  The ratio (volume%) of the inorganic particles having a particle diameter of 1.2 μm or more and 15 μm or less contained in the ink receiving layer is shown in “Ratio (%) of the inorganic pigment to the total volume” in Table 1. .

  The presence or absence of cracks on the surface of the glossy layer was evaluated by visually observing the surface of the produced inkjet recording material. For “good”, no cracks are observed. In “OK”, very few fine cracks are observed. “No” has many cracks. The results are shown in “Crack of coating layer” in Table 1.

  The ink absorptivity was evaluated by visually observing the uniformity of solid print portions, the boundary between adjacent solid print portions, the sharpness of white characters, and the like, and was represented by a numerical value of 1 to 10. 1 indicates that the ink absorbability is the worst, and the larger the numerical value, the better the ink absorbency, and 10 indicates the most ink absorbability. The results are shown in “ink absorbability” in Table 1.

  Ink color development was measured by using a densitometer (Macbeth RD918) for the density of the black solid print portion. The higher the value, the better the color developability of the ink. The results are shown in “Ink color development” in Table 1.

<Surface gloss>
As for the surface gloss, a 75-degree specular gloss was measured according to JIS-Z8741. The results are shown in “Surface gloss” in Table 1.

  As shown in Examples 1 to 22 in Table 1, 50% by volume or more of the total volume of the inorganic particles contained in the ink receiving layer is a particle diameter of 1.2 μm or more and 15 μm or less, and the gloss expressing layer is at least inorganic A coating solution containing fine particles, a hydrophilic binder and boric acid is sequentially applied and dried so that the dry coating amount of the glossy layer is 20% by mass or more and 120% by mass or less of the dry coating amount of the ink receiving layer. By using the ink jet recording material, it was possible to obtain an ink jet recording material having both the absorbability and the color developability of the pigment ink without causing cracks on the surface of the glossy layer even when dried by heat. In addition, the absorption is improved by making the oil absorption of the inorganic particles 160 ml / 100 g to 320 ml / 100 g, and the surface gloss is improved by using the ink receiving layer of pH 8 to 11 and the gloss developing layer of pH 3 to 5, Furthermore, by adding basic polyaluminum hydroxide to the glossy layer, the separation of the colorant pigment and the solvent in the pigment ink is further improved, and ink jet recording with better surface gloss, ink absorption and color development. The material could be obtained.

  In Comparative Example 1, since only the ink receiving layer is used, sufficient color developability cannot be obtained. In Comparative Example 2, when only the glossy layer is used, the absorbability of the pigment ink is insufficient. Cracking occurred. In Comparative Example 3, the ink absorbability is not sufficient because the particle size of the inorganic particles contained in the ink receiving layer is small. Conversely, in Comparative Example 4, the particle size is too large for the ink receiving layer. Cracks occurred, and surface gloss and color developability decreased. Further, in Comparative Examples 5, 6 and 7, since the glossy expression layer did not contain boric acid, cracking could not be prevented. In Comparative Examples 8 and 9 that deviate from the coating amount ratio of the ink receiving layer and the gloss developing layer of the present invention, it is possible to combine both the absorbability and the color developability of the pigment ink without causing cracks on the surface of the gloss developing layer. could not.

Claims (5)

  50% by volume of the total volume of inorganic particles contained in the ink receiving layer in an ink jet recording material formed by sequentially applying and drying the ink receiving layer and the gloss developing layer on at least one side of the support. The above is a particle size of 1.2 μm or more and 15 μm or less, and the glossy layer contains at least inorganic ultrafine particles, a hydrophilic binder and boric acid or borate, and the glossy layer has a dry coating amount of An ink jet recording material comprising 20% by mass or more and 120% by mass or less of the dry coating amount of the ink receiving layer.   2. The ink jet recording material according to claim 1, wherein the inorganic particles have an oil absorption of 160 ml / 100 g or more and 320 ml / 100 g or less represented by JIS-K5101.   3. The ink jet recording material according to claim 1, wherein the pH of the ink receiving layer coating liquid is from 8 to 11, and the pH of the glossy layer coating liquid is from 3 to 5.   The ink jet recording material according to claim 1, wherein the inorganic ultrafine particles are alumina hydrate.   The inkjet recording material according to claim 1, wherein the glossy layer contains basic polyaluminum hydroxide.