JP2009137160A - Deodorizable inkjet recording sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deodorizable inkjet recording sheet which has excellent deodorization effect, also has excellent immediate effect and maintainability, and further can obtain a photography image. <P>SOLUTION: Disclosed is a deodorizable inkjet recording sheet obtained by providing an ink receiving layer comprising a mordant and silica on the surface of a supporting body comprising an amorphous aluminum-containing composite phyllosilicate having a three component compositional ratio of SiO<SB>2</SB>: 5 to 80 mol%, ZnO: 5 to 65 mol%, and Al<SB>2</SB>O<SB>3</SB>: 1 to 60 mol% and a fiber for paper manufacture. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a deodorant inkjet recording sheet, and more particularly to a deodorant inkjet recording sheet capable of photographic-like recording.

With the recent increase in airtightness of living spaces and the urbanization and diversification of living environments associated with building technology, interest in odors around us has increased, especially in the workplace and at home, air purification such as deodorization and slow dust is required. It has been.
Conventionally, paper that has been proposed as deodorizing paper is known in which activated carbon is fixed to the pulp with a binder, but it is essentially black due to the use of activated carbon, and its appearance is poor. The use was limited, and the gas adsorption ability of the activated carbon was selective, so that it was not possible to exert a wide range of effects against various bad odors. In order to improve these points, deodorized paper coated with an inorganic substance having solid acidity (see, for example, Patent Document 1), and deodorized paper in which aluminum hydroxide is contained in pulp (see, for example, Patent Document 2). Etc. have been proposed.
_Further, SiO 2 5 to 80 mol%, ZnO 5 to 65 _{mol%, Al} 2 O 3 deodorizing sheet obtained by carrying aluminosilicate zinc porous sheet consisting of 1 to 60 mol% (e.g., Patent Documents 3 and 4 In addition, a deodorizing sheet (for example, see Patent Document 5) carrying an oxidizing agent such as ammonium persulfate in combination has also been reported.
Further, as a deodorizing sheet capable of inkjet recording, etc., a deodorizing sheet (see, for example, Patent Document 6) in which a layer containing a thermal catalyst on an inkjet image-receiving layer and a layer containing a photocatalyst thereon is provided, and charcoal powder is contained on the back surface. Inkjet printing sheets (see, for example, Patent Document 7) in which a layer is formed, inkjet recording materials containing antibacterial colored particles of an ink receiving layer (for example, see Patent Document 8), and the like have been reported.
JP-A-1-239200 Japanese Patent Laid-Open No. 2-47395 Japanese Patent Laid-Open No. 1-176448 JP-A-6-285367 JP-A-2-277455 JP 2001-58002 A JP 2002-113939 A JP 2005-288886 A

However, although the deodorizing paper or deodorizing sheet of Patent Documents 1 and 2 is integrated by adding an odor eliminating base to pulp using an adhesive or making a deodorizing substrate with pulp, There was a drawback that the odor base was easily removed.
The deodorizing paper or deodorizing sheet of Patent Documents 3 and 5 is slightly improved both in terms of deodorizing capacity and selectivity of the deodorizing effect, but in terms of deodorizing various malodorous components quickly to a human threshold or less. , Still not enough.
The deodorant sheet of Patent Document 4 is intended for deodorization itself and is not something that can be appreciated. In addition, the immediate effect is not sufficient, and the effect on acetic acid components is not sufficient.
In Patent Document 6, there is a layer that deteriorates the image quality in the inkjet image receiving layer, so that the image quality is not photographic-like. In Patent Document 7, the inkjet image receiving layer and the deodorizing effect are unclear. There were various problems such as odor performance, in particular, that the image quality was not photographic-like.
The present invention has been made in view of the above, and provides a deodorant inkjet recording sheet that has an excellent deodorizing effect, is excellent in immediate effect and sustainability, and provides a photographic-like image quality. For the purpose.

<1> 3-component composition ratio _SiO 2: 5 to 80 mol%, ZnO: 5 to 65 _{mol%, Al} 2 O 3: _1~60 mol% amorphous papermaking and aluminum-containing composite phyllosilicate is A deodorant inkjet recording sheet in which an ink receiving layer containing a mordant and silica is provided on a support containing fibers.
<2> The deodorant inkjet recording sheet according to <1>, wherein the silica is vapor-phase process silica.

<3> The deodorant inkjet recording sheet according to <1> or <2>, wherein the mordant is polyaluminum hydroxide.
<4> The deodorant inkjet recording sheet according to any one of <1> to <3>, wherein the mordant is a polydiallylamine derivative.

  According to the present invention, it is possible to provide a deodorant ink jet recording sheet that has an excellent deodorizing effect, is excellent in immediate effect and sustainability, and provides a photographic-like image quality.

Deodorizing ink jet recording sheet of the present invention, the ternary ratio of _SiO 2: 5 to 80 mol%, ZnO: 5 to 65 _{mol%, Al} 2 O 3: amorphous containing 1 to 60 mol% An ink receiving layer containing a mordant and silica is provided on a support including an aluminum composite phyllosilicate and a papermaking fiber.
By adopting the above-described configuration, it is possible to obtain a deodorant inkjet recording sheet that has a deodorizing effect excellent in deodorizing power, immediate effect, and sustainability, and that provides a high-quality image having a photographic-like gloss. .
Surprisingly, it has been found that the deodorant inkjet recording sheet of the present invention is superior to the deodorant sheet containing an aluminum-containing composite phyllosilicate, which is conventionally known as a deodorant material, and has an immediate effect. It was. The reason is not clear, but the aluminum-containing composite phyllosilicate has a large deodorizing power and excellent sustainability, but has a relatively small surface area and therefore has a slow adsorption / desorption rate. On the other hand, although the ink-receptive layer is not large in deodorizing power, it is presumed that the adsorption / desorption speed of the odor component is fast because the silica / mordant has a large surface area. That is, first, the odor component is adsorbed on the ink receiving layer, but is desorbed because the adsorbability is not high, and the concentration of the odor component near the sheet increases. Since the odor components gathered in the vicinity of the sheet are efficiently adsorbed by the aluminum-containing composite phyllosilicate, it is considered that the immediate effect is excellent. In addition, silica / mordant has a high adsorption power for acetic acid-based components, and is presumed to play a role in compensating for the weaknesses of aluminum-containing composite phyllosilicates.

[Support]
The support in the present invention comprises a base paper having at least an amorphous aluminum-containing composite phyllosilicate and papermaking fibers.
The support can effectively hold the amorphous aluminum-containing composite phyllosilicate by including the fiber for papermaking.

Composite phyllosilicates of the amorphous used as deodorizing base is a complex of a phyllosilicate formed amorphous silica or silica-alumina and the surface, SiO ₂ in the ternary ratio 5 to 80 mol% (preferably 25 to 70 mol%), ZnO 5 to 65 mol% (preferably 15 to 60 _{mol%), Al} 2 O 3 _1~60 mol% (preferably 1 to 45 mol%) Having a composition.

  Such a composite phyllosilicate and a process for producing the same are described in JP-A 63-2110017. For example, a water-soluble silicate, water-soluble zinc salt, water-soluble An amorphous composite phyllosilicate is obtained as a white powder in which an aluminum-containing phyllosilicate is formed on the surface of amorphous silica or silica alumina by adding a reactive aluminum salt or aluminate to react. be able to. The composite phyllosilicate used as a deodorant base in the present invention preferably has an average particle size of 1 to 20 μm.

The papermaking fiber contained in the support may be wood pulp, waste paper pulp, synthetic pulp, or the like. Hereinafter, the papermaking fiber is also referred to as “pulp”.
The said support body consists of a structure containing a base paper, and a base paper is obtained by papermaking the pulp paper material which beaten desired pulp, especially the pulp slurry which was beaten and prepared.
In the paper making process for making paper, the web layer side corresponding to the surface on which the recording layer of the base paper is coated, for example, is dried by pressing the dryer canvas against the drum dryer cylinder. In this process, the dryer canvas Can be dried within the range of 1.5 to 3 kg / cm.

  The pulp is not particularly limited, and natural pulp selected from conifers, hardwoods, etc., for example, LBKP (hardwood bleached kraft pulp) such as aspen, acacia, maple, poplar, eucalyptus, spruce, Douglas It can be appropriately selected from NBKP (softwood bleached kraft pulp) such as fur material, LBSP, NBSP, LDP, NDP, LUKP, NUKP and the like. These can be used alone or in combination of two or more, in addition to being used alone.

  The form of the pulp constituting the base paper is preferably 30% by mass or more of kraft pulp made of maple (maple material LBKP), more preferably 50% by mass or more of maple material LBKP. When the blending amount of the maple material LBKP in the pulp is 30% by mass or more, the smoothness of the support is improved and the glossiness is further improved.

  The manufacturing method of said kraft pulp (LBKP) is not specifically limited, The manufacturing method of a normal kraft pulp can be used widely. The kraft pulp is beaten so that the water retention is within a predetermined range, and then a sizing agent is added to the pulp as necessary to prepare a pulp slurry, and the prepared pulp slurry is paper-made. In addition, when setting it as multiple types of mixed pulp, while beating and preparing a certain kraft pulp, beating and preparing other pulp separately from this kraft pulp, both are mixed.

  When making paper, the freeness after beating of LBKP is preferably 200 to 400 ml in accordance with the Canadian standard freeness (C.S.F). When the freeness is in the above range, the swelling / shrinkage rate is small, and good flatness (surface smoothness) can be obtained. The freeness is a value measured in accordance with the Canadian Standard Test Method in “Pulp Freeness Test Method” of JIS-P8121.

  The water retention after beating is preferably 100 to 200%. When the water retention of the pulp after beating constituting the pulp stock before papermaking is in the above range, the pulp has a low expansion / shrinkage ratio, high gloss, and smooth surface properties with little unevenness.

  The degree of water retention refers to JAPAN TAPPI Paper Pulp Test Method No. 26: 2000 (pulp-water retention test method). This is due to the method of dewatering the pulp suspension by centrifugal force and measuring the water retention of the pulp after dehydration. Specifically, the beaten pulp suspension is filtered through a suitable filtration cup called a centrifugal cup. After suction filtration in step 1, each container is placed in a settling tube of a centrifuge and centrifuged for a certain period of time under certain conditions, and the dehydrated wet pulp is taken out and weighed. Next, drying is performed at 105 ° C., and the wet pulp after centrifugal dehydration is absolutely dried. Then, the mass of the wet pulp after centrifugal dehydration is A, the mass of the pulp after absolutely dry is B, and the water retention (%) = (A−B) / B × 100.

  As the pulp, it is preferable to use a pulp with few impurities, and it is also useful to use a pulp (bleached pulp) that has been subjected to a bleaching treatment to improve whiteness.

  Among the above, the pulp is preferably a hardwood bleached kraft pulp (bleached LBKP) that has been bleached to improve whiteness in terms of impurities and hue, and among them, aspen, acacia, maple, and poplar Hardwood bleached kraft pulp (bleached LBKP) comprising at least one selected from the above is particularly preferred. Each of these bleaching LBKPs may be used alone or as a mixed pulp in which two or more kinds of bleaching LBKP are mixed, or one or two or more kinds of bleaching LBKP and one or more kinds of other pulps other than the bleaching LBKP. As the mixed pulp, it can be suitably used.

  The content of the papermaking fiber (pulp) in the base paper is preferably 60% by mass or more from the viewpoint of retention of the amorphous aluminum-containing composite phyllosilicate and other compounds contained in the base paper. 80 mass% or more is more preferable.

The blending amount of the papermaking fiber (pulp) and the composite phyllosilicate in the base paper is not particularly limited, but the composite phyllosilicate 10 to 100 parts by mass of the papermaking fiber (pulp). 70 parts by mass is preferred.
The support in the present invention comprises a base paper, and can be obtained, for example, by preparing a papermaking raw material by dispersing papermaking fibers and composite phyllosilicate in water and papermaking it by a conventional method. Moreover, additives, such as a binder and a flocculant, can also be mix | blended as needed.

The amorphous aluminum-containing composite phyllosilicate is preferably contained in a pulp stock before paper making.
Furthermore, the anionic colloidal silica can further be contained in the pulp stock before paper making. That is, it is preferable to make paper after the addition of anionic colloidal silica to obtain the base paper according to the present invention. The inclusion of anionic colloidal silica is effective in improving the sharpness when cutting, that is, the cutting suitability, in addition to the ability to enhance dehydration (that is, function as a drainage aid).

The specific surface area of the anionic colloidal silica is preferably in the range of 100 to 1000 m ² / g, and the average particle diameter is preferably in the range of 1 to 20 nm.

  As content in the case of containing the anionic colloidal silica, 0.005 to 0.5 mass% with respect to the amount of the pulp according to the present invention, in terms of the above-described cutting suitability improvement and dewatering improvement. Preferably, 0.01 to 0.2 mass% is more preferable.

  The paper machine for making the pulp stock is not particularly limited, and can be appropriately selected from conventionally known paper machines. For example, a long paper machine equipped with a shaking device having a vibration amplitude of 10 mm or more can be cited, and a paper machine having a dandy roll (for example, a dandy roll made of 60 to 100 mesh wire) in terms of improving flatness. Is preferred.

  The base paper in the present invention is preferably composed mainly of normal natural pulp as the papermaking fiber (pulp), and the base paper contains clay, talc, calcium carbonate, urea resin fine particles and the like as additive chemicals. Fillers, sizing agents such as rosin, alkyl ketene dimers, higher fatty acid salts, paraffin wax, alkenyl succinic acid, paper strength enhancers such as starch, polyacrylamide and polyvinyl alcohol, moisture retention agents such as polyethylene glycols, sulfate bands, etc. Fixing agents, etc. can be added as appropriate. In addition, white pigments such as dyes and titanium oxide, fluorescent dyes, slime control agents, antifoaming agents, and softening agents such as quaternary ammonium can be added as necessary.

The surface of the base paper made of natural pulp paper can be surface-sized with a film-forming polymer such as gelatin, starch, carboxymethylcellulose, polyacrylamide, polyvinyl alcohol, or a modified product of polyvinyl alcohol. Examples of modified polyvinyl alcohol include carboxyl group-modified products, silanol-modified products, and copolymers with acrylamide. The coating amount of the film-forming polymer in the case of surface sizing by the film-forming polymer is preferably adjusted to ^{0.1~5.0g / m 2, 0.5~2.0g / m} 2 It is more preferable to adjust to. Further, an antistatic agent, a fluorescent brightening agent, a pigment, an antifoaming agent, and the like can be added to the film-forming polymer as necessary.

  The base paper usually has a moisture content of about 7.0% by mass, but in the present invention, considering the texture of the base paper, 7.5 to 10% by mass is preferable, and 8.0 to 10% by mass is more preferable. preferable.

Further, the thickness of the base paper (after calendering described later) is not particularly limited, and is preferably 150 to 250 μm, and the basis weight of the base paper is preferably 150 to 250 g / m ² , particularly 180. ˜220 g / m ² is preferred.

  The base paper according to the present invention preferably has excellent surface smoothness and flatness in consideration of the case where flatness such as photographic printing paper is desired. From such a viewpoint, a machine calendar, a super calendar, etc. A surface treatment can be performed by applying heat and pressure by applying a calendering treatment to give a higher degree of smoothness.

The density of the base paper is generally 0.7 to 1.2 g / m ² (JIS P-8118). Further, as the stiffness of the base paper, MD (vertical direction) is 1.0 to 3.0 mNm and CD (horizontal direction) is 0.5 to 1.5 mNm under the conditions specified in JIS P-8125 (2000). preferable.

A surface sizing agent may be applied to the surface of the base paper. As the surface sizing agent, the same sizing agent that can be added to the base paper can be used.
Moreover, it is preferable that pH of a base paper is 5-9 by the measured value by the hot water extraction method prescribed | regulated by JISP-8113.

  Glossiness can be adjusted by adjusting the center plane average roughness (SRa) of the surface of the support (particularly the base paper) and improving the smoothness of the support (particularly the base paper). is there.

  Specifically, the center plane average of the surface of the support (particularly the base paper) constituting the deodorant inkjet recording sheet of the present invention at least on the side where the ink receiving layer is formed (that is, one side or both sides of the substrate). The roughness (SRa) shall be 0.70 μm or less when measured under the condition of cut-off 0.05 to 0.5 mm, and 0.80 μm or less when measured under the condition of cut-off 1 to 3 mm. Can be suitably adjusted.

  The center plane average roughness (SRa) is an index for evaluating the smoothness (surface smoothness) of the surface of the support (particularly the base paper), and when the center plane average roughness SRa is out of the above range, When an image recording material is constituted, glossiness and surface smoothness suitable for forming a photographic-like image may not be obtained.

  In other words, when SRa when measured under a condition of a cut-off of 0.05 to 0.5 mm exceeds 0.70 μm, specifically, when a deodorant inkjet recording sheet is formed, reflection of a fluorescent lamp is reflected. In some cases, the reflection image such as the image may appear blurred and the glossiness may deteriorate, and if the SRa when measured under the condition of a cutoff of 1 to 3 mm exceeds 0.80 μm, the deodorant inkjet recording sheet Specifically, the reflected image such as the reflection of the fluorescent lamp may appear distorted, and the glossiness may be deteriorated.

  The SRa is preferably 0.60 μm or less under a condition of a cutoff of 0.05 to 0.5 mm and 0.60 μm or less under a condition of a cutoff of 1 to 3 mm. The lower limit of each SRa is preferably closer to 0 μm.

  The center plane average roughness SRa is determined by using ZYGO New View 5000 (manufactured by ZYGO Co., Ltd.) under the condition of a cut-off of 0.05 to 0.5 mm. By using Kuroda Seiko Co., Ltd.), the values are each suitably measured.

  In the above, from the viewpoint of improving the smoothness of the support (particularly the base paper), the dispersion of the inorganic fine particles (vapor phase method silica fine particles) in the coating liquid for forming the ink receiving layer is performed by an ultrasonic disperser or a high pressure disperser (particularly a high pressure disperser). It is also possible to adjust glossiness by adjusting the dispersion state (dispersibility) of the inorganic fine particles by using a jet disperser. Details of the inorganic fine particles are as described later.

  Specifically, by using an ultrasonic disperser or a high-pressure disperser instead of a disperser using a dispersion such as beads (for example, a bead mill disperser) generally used for dispersion of inorganic fine particles. It can adjust suitably. As the high-pressure disperser, for example, a disperser of a liquid-liquid facing collision type [for example, an optimizer system (manufactured by Sugino Machine Co., Ltd.)] is preferable, and the dispersion treated with this disperser is highly transparent. The manufactured deodorant inkjet recording sheet used (especially the ink receiving layer) has a high glossiness.

  In the dispersion by the ultrasonic disperser, the dispersion is further obtained by applying ultrasonic waves to the pre-dispersed liquid containing inorganic fine particles and preliminarily dispersed. There is no particular limitation as long as ultrasonic irradiation is possible. For example, an ultrasonic disperser UH-600H manufactured by SMT Co., Ltd. can be suitably used.

  In the dispersion by the high-pressure disperser (particularly, the high-pressure jet disperser), the pre-dispersed liquid containing inorganic fine particles and preliminarily dispersed is caused to collide with a liquid-liquid oppositely at a high pressure, or is passed through an orifice at a high pressure. To further disperse to obtain a dispersion. There is no particular limitation as long as it is an aspect capable of opposing collision at high pressure or passage to the orifice, and a commercially available device generally called a high pressure homogenizer can be suitably used.

  The orifice is a mechanism that inserts a thin plate (orifice plate) having a fine hole such as a circle into the straight pipe and rapidly narrows the flow path of the straight pipe.

  The high-pressure disperser is basically an apparatus composed of a high-pressure generating unit for pressurizing raw material slurry and the like, and a liquid-liquid facing collision unit or an orifice unit. As the high-pressure generator, a high-pressure pump generally called a plunger pump is suitable, and the high-pressure pump includes various types such as a series type, a double type, a triple type, and any type is particularly limited. It is applicable.

  Examples of the high-pressure disperser include a nanomizer manufactured by Nanomizer, a microfluidizer manufactured by Microfluidics, and an optimizer manufactured by Sugino Machine.

  The processing pressure when the liquid-liquid facing collision is performed at a high pressure is preferably 50 MPa or more, more preferably 100 MPa or more, and particularly preferably 130 MPa or more. Further, the differential pressure between the orifice inlet side and the outlet side when passing through the orifice is preferably 50 MPa or more, more preferably 100 MPa or more, and particularly preferably 130 MPa or more, like the treatment pressure.

In any case, since the dispersion efficiency depends on the processing pressure, the higher the processing pressure, the higher the dispersion efficiency. However, the upper limit of the processing pressure is 350 MPa. When it is less than 350 MPa, it is preferable in terms of pressure resistance such as piping of a high-pressure pump and durability of the apparatus.
Moreover, there is no restriction | limiting in particular in the frequency | count of a process, Usually, it selects suitably in the range of 1 to several dozen times.

When preparing a dispersion, various additives can be added.
Examples of additives include nonionic or cationic surfactants (anionic surfactants are not preferred for forming aggregates), antifoaming agents, nonionic hydrophilic polymers (polyvinyl alcohol, polyvinylpyrrolidone). , Polyethylene oxide, polyacrylamide, various sugars, gelatin, pullulan, etc.), nonionic or cationic latex dispersion, water-miscible organic solvent (ethyl acetate, methanol, ethanol, isopropanol, n-propanol, acetone, etc.), Inorganic salts, pH adjusters and the like can be mentioned, and can be appropriately added as necessary.

  The water-miscible organic solvent is particularly preferable in terms of suppressing the formation of fine lumps when inorganic fine particles (particularly gas phase method silica) are pre-dispersed. The content of the dispersion is preferably 0.1 to 20% by mass, particularly preferably 0.5 to 10% by mass.

  In addition, the pH when preparing a dispersion of inorganic fine particles (particularly gas phase method silica) can vary widely depending on other components such as the type of inorganic fine particles (particularly gas phase method silica) and various additives, Generally it is the range of 1-8, and the range of 2-7 is especially preferable.

  When preparing a dispersion of inorganic fine particles, the average primary particle size of the inorganic fine particles is preferably 30 nm or less, more preferably 20 nm or less, still more preferably 10 nm or less, and particularly preferably 3 to 10 nm. Furthermore, from the viewpoint of giving glossiness, the average primary particle size of the inorganic fine particles is 30 nm or less, and the secondary particle size of the inorganic fine particles in the dispersion after dispersion is 200 nm or less (more preferably 150 nm or less, particularly Preferably it is 120 nm or less.

  In addition to the additives, a mode in which a water-soluble organic cation compound and / or a water-soluble polyvalent metal compound is added and dispersed using the above-described disperser according to the present invention is also suitable.

<Water-soluble organic cation compound>
The inorganic fine particles are preferably used in a state of being predispersed before dispersion. In this case, it is possible to suitably perform dispersion by containing at least one water-soluble organic cation compound as a dispersant (aggregation inhibitor).

  Although there is no restriction | limiting in particular in a water-soluble organic cation compound, The example of the mordant mentioned later etc. Water-soluble organic cation compound which has a primary-tertiary amino group, a quaternary ammonium base, or a phosphonium base (These Salt) are preferred. Among them, the average molecular weight is preferably 50,000 or less, and particularly preferably 20,000 or less. A silane coupling agent can be used as the other dispersant.

  Among the water-soluble organic cation compounds, a water-soluble organic cation compound having a polydiallylamine derivative as a constituent unit is particularly preferable, and this can be obtained by cyclocondensation of a diallylamine compound. Examples of commercially available products include Charol DC902P (Daiichi Kogyo Seiyaku Co., Ltd.), Jetfix 110 (Satoda Kako Co., Ltd.), Unisense CP-101 to 103 (Senka Co., Ltd.), PAS-H (Nittobo Co., Ltd.), and the like. It is done.

  The amount of the water-soluble organic cation compound is preferably 1 to 10% by mass and more preferably 1 to 5% by mass with respect to the inorganic fine particles. When the amount increases, as described above, the gelation ability after coating decreases depending on the type of vapor phase silica.

As the water-soluble organic cation compound, a water-soluble or aqueous emulsion type can be suitably used. For example, a dicyan cation resin represented by a dicyandiamide-formalin polycondensate, a polyamine represented by a dicyanamide-diethylenetriamine polycondensate system cationic resin, epichlorohydrin - dimethylamine addition polymers, dimethyldiallylammonium chloride -SO ₂ copolymer, diallylamine salt -SO ₂ copolymer, dimethyl diallyl ammonium chloride polymer, polymer of allylamine salt, dialkylaminoethyl (meth ) Polycationic cationic resins such as acrylate quaternary salt polymers and acrylamide-diallylamine salt copolymers. Among them, dimethyl diallyl ammonium chloride, monomethyl diallyl ammonium chloride and polyamidine are preferable, and dimethyl diallyl ammonium chloride and monomethyl ammonium chloride are particularly preferable in terms of water resistance. A water-soluble organic cation compound may be used individually by 1 type, or may use 2 or more types together.

  The content of the water-soluble organic cation compound in the ink receiving layer is preferably 1 to 10% by mass and more preferably 1 to 5% by mass with respect to the mass of the inorganic fine particles.

  The water-soluble organic cation compound may be added to the dispersion medium before adding the inorganic fine particles, or may be added during the preliminary mixing or after the dispersion is completed. In view of obtaining a more stable dispersion, it is particularly preferred to add it to the dispersion medium before adding the inorganic fine particles.

<Water-soluble polyvalent metal compound>
The water-soluble organic cation compound can be used in the dispersion without using or using at least one water-soluble polyvalent metal compound.

  The water-soluble polyvalent metal compound may be added to the dispersion medium, or may be added during premixing or after the completion of dispersion. In view of obtaining a more stable dispersion, it is preferable to add it to the dispersion medium before adding the inorganic fine particles.

The water-soluble polyvalent metal compound is preferably a trivalent or higher valent metal compound. For example, a water-soluble salt of a metal selected from calcium, barium, manganese, copper, cobalt, nickel, aluminum, iron, zinc, zirconium, chromium, magnesium, tungsten, and molybdenum can be given.
Specific examples include calcium acetate, calcium chloride, calcium formate, calcium sulfate, calcium butyrate, barium acetate, barium sulfate, barium phosphate, barium oxalate, barium naphthoresorcin carboxylate, barium butyrate, manganese chloride, manganese acetate, Manganese formate dihydrate, manganese ammonium sulfate hexahydrate, cupric chloride, ammonium copper (II) chloride dihydrate, copper sulfate, copper (II) butyrate, copper oxalate, copper phthalate, copper citrate , Copper gluconate, copper naphthenate, cobalt chloride, cobalt thiocyanate, cobalt sulfate, cobalt acetate (II), cobalt naphthenate, nickel sulfate hexahydrate, nickel chloride hexahydrate, nickel acetate tetrahydrate, sulfuric acid Nickel ammonium hexahydrate, nickel amidosulfate tetrahydrate, nickel sulfamate, 2 Nickel ethylhexanoate, aluminum sulfate, aluminum sulfite, aluminum thiosulfate, polyaluminum chloride, aluminum nitrate nonahydrate, aluminum chloride hexahydrate, aluminum acetate, aluminum lactate, basic aluminum thioglycolate, 1st bromide Iron, ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, iron (III) citrate, iron (III) lactate trihydrate, triammonium iron trioxalate (III) trihydrate Japanese products, zinc bromide, zinc chloride, zinc nitrate hexahydrate, zinc sulfate, zinc acetate, zinc lactate, zirconium acetate, zirconium chloride, zirconium chloride octahydrate, zirconium zirconium chloride, chromium acetate, chromium sulfate, Magnesium acetate, magnesium oxalate, magnesium sulfate, magnesium chloride hexahydrate, magnesium citrate Hydrates, sodium phosphate, sodium tungsten citrate, 12 tungstophosphoric acid n-hydrate, dodecatungstosilicic acid 26-hydrate, molybdenum chloride, dodecamolybdophosphoric acid n-hydrate. Two or more of these water-soluble polyvalent metal compounds may be used in combination.
In the present invention, “water-soluble” in a water-soluble polyvalent metal compound means that 1% by mass or more dissolves in water at 20 ° C.

  Of the above water-soluble polyvalent metal compounds, compounds of aluminum or Group 4A metals (for example, zirconium, titanium) of the periodic table are preferable. Particularly preferred is a water-soluble aluminum compound. Examples of the water-soluble aluminum compound include inorganic salts such as aluminum chloride or a hydrate thereof, aluminum sulfate or a hydrate thereof, ammonium alum, and the like. Aluminum compounds are preferred.

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⁺ , [Al ₁₃ Examples include (OH) ₃₄ ] ⁵⁺ , [Al ₂₁ (OH) ₆₀ ] ³⁺ , and other water-soluble polyaluminum hydroxides that stably contain a basic and high-molecular polynuclear condensed ion.
[Al ₂ (OH) _n Cl _6-n ] _m General formula 1
[Al (OH) ₃ ] _n AlCl ₃ ... General formula 2
Al _n (OH) _m Cl _(3n-m) [0 <m <3n] ... General formula 3

  These are water treatment agents from Taki Chemical Co., Ltd. under the name of polyaluminum chloride (PAC), from Asada Chemical Co., Ltd. under the name of polyaluminum hydroxide (Paho), and from Hakone Co., Ltd. to HAP. The name is -25, which is Alphain 83 from Daimei Chemical Co., Ltd. and is also marketed by other manufacturers for the same purpose, and various grades are easily available.

  Preferable examples of the water-soluble polyvalent metal compound containing Group 4A metal of the periodic table include water-soluble compounds containing titanium or zirconium. Examples of the water-soluble compound containing titanium include titanium chloride and titanium sulfate. Water-soluble compounds containing zirconium include zirconium acetate, zirconium chloride, zirconium oxychloride, hydroxy zirconium chloride, zirconium nitrate, basic zirconium carbonate, zirconium hydroxide, zirconium lactate, zirconium carbonate / ammonium, zirconium carbonate / potassium, zirconium sulfate. And zirconium fluoride compounds.

  The content of the water-soluble polyvalent metal compound in the ink receiving layer is preferably in the range of 0.1 to 10% by mass and more preferably in the range of 0.5 to 8% by mass with respect to the inorganic fine particles.

  The dispersion medium used for dispersing the inorganic fine particles is preferably water or a mixed solvent of water and a small amount of an organic solvent (a low-boiling solvent such as a lower alcohol or ethyl acetate). In that case, the organic solvent is preferably 20% by mass or less, more preferably 10% by mass or less, based on the total dispersion medium.

  Pre-mixing (premixing, pre-dispersion) before dispersion by the high-pressure disperser or ultrasonic disperser can be performed by ordinary propeller stirring, turbine stirring, homomixing stirring, or the like. As described above, a high-pressure disperser (particularly a high-pressure jet disperser), an ultrasonic disperser, or the like is used for the secondary dispersion.

  Further, from the viewpoint of increasing the concentration of the inorganic fine particles in the dispersion liquid, a method of adding the inorganic fine particles stepwise is preferable.

In the present invention, the liquid temperature when premixing or predispersing as the primary dispersion is not particularly limited, and is preferably 30 ° C. or less, particularly in that a slurry of inorganic fine particles (particularly silica fine particles) can be stably prepared. 25 degrees C or less is preferable. In this case, the dispersion medium before adding the inorganic fine particles may be kept at 20 ° C. or lower, or may be cooled to 20 ° C. or lower by cooling during the preliminary mixing.
In addition, it is preferable to inject into the disperser in a state where the temperature of the slurry of the inorganic fine particles is 20 ° C. or lower, and further 15 ° C. or lower from the viewpoint of obtaining a more stable dispersion.

  The time after preparation of the dispersion and / or the coating liquid for forming the ink receiving layer (ink receiving layer coating liquid) is preferably 5 hours or more, more preferably 8 hours from the viewpoint of stabilizing the coated surface. That's it. The upper limit is not limited and may be several days to several tens of days. The temperature over time is about 10 ° C to about 40 ° C, preferably about 15 ° C to about 35 ° C. The inorganic fine particles may be gently stirred over time so as not to settle.

From the viewpoint of the stability of the coating solution, it is also preferable to apply a heat treatment at 45 ° C. or lower between the end of dispersion of the inorganic fine particles and the application of the coating solution for the ink receiving layer, and then apply after the heat treatment. In particular, the inorganic fine particle dispersion was subjected to a heat treatment at 30 to 48 ° C., preferably 40 to 45 ° C. for about 120 minutes or longer (no upper limit, but preferably about 1 hour or longer and about 24 hours or shorter). Thereafter, it is preferable to prepare and apply a coating liquid for the ink receiving layer.
Furthermore, a mode in which the dispersion of inorganic fine particles is aged for 5 hours or more and combined with heat treatment is particularly preferable.

  The deodorant inkjet recording sheet of the present invention is a dispersion of inorganic fine particles prepared as described above, or the dispersion, a hydrophilic binder such as polyvinyl alcohol, a crosslinking agent for the hydrophilic binder, a surfactant, After preparing a coating liquid for an ink-receiving layer by mixing a water-dispersible cationic resin, etc., a substrate (support) such as paper, polyolefin resin-coated paper, or plastic resin film using any one of these as a coating liquid ) And can be manufactured.

When the dispersion is prepared as described above, the concentration of the inorganic fine particles in the dispersion is appropriately about 10 to 40% by mass, and preferably 15 to 35% by mass.
The concentration of inorganic fine particles (particularly silica fine particles) in the ink-receiving layer coating solution is suitably about 5 to 25% by mass, preferably 8 to 20% by mass. The amount of inorganic fine particles in the ink receiving layer is preferably in the range of 5 to 30 g / m ² .

  The deodorant inkjet recording sheet of the present invention is preferably used by dissolving a water-soluble resin, a surfactant, and a water-soluble organic solvent having a boiling point of 150 ° C. or more in an aqueous solution (aqueous medium).

  In addition, in terms of enhancing the apparent surface characteristics and texture when the support is composed of a base paper, the paper ground index is also important, and the base paper according to the present invention has a ground index value of 60 or more. It is preferably made of paper.

  The texture index indicates that the larger the value, the better the texture, and by making the texture index value particularly in the above range, there is no texture unevenness, the smoothness is uniform and high, It is possible to enhance the texture.

In other words, when the formation index value is less than 60, the occurrence of uneven formation becomes remarkable, and the surface uniformity and texture may be inferior. As a result, when an image recording material is constructed, the formability of a photographic-like high-quality image is impaired.
The formation index value is preferably 70 or more.

  The formation index value is M / K Systems, Inc. A 3D sheet analyzer (M / K950) manufactured by (MKS) was used, and the aperture of the analyzer was 1.5 mm in diameter and measured using a micro formation tester (MFT).

  That is, a sample is mounted on a rotating drum in a 3D sheet analyzer, and a local basis weight difference in the sample is determined by a light source mounted on the drum shaft and a photodetector mounted on the outside of the drum corresponding to the light source. Measure as light intensity difference. The measurement target range at this time is set by the diameter of the diaphragm attached to the light incident part of the photodetector. Next, the light intensity difference (deviation) is amplified, A / D converted, classified into 64 photometric basis weight classes, and 100,000 pieces of data are taken in one scan, and the histogram frequency for that data is taken. Get. Then, the highest frequency (peak value) of the histogram is divided by the number of classes having a frequency of 100 or more among those classified into classes corresponding to 64 micro basis weights, and the divided value is set to 1/100. The value is calculated as the formation index value.

  As a method of increasing the formation index value, that is, improving the texture of the base paper, for example, a screen or a vortex cleaner is installed in front of the head box of the paper machine so that the flow direction of the base paper raw material is not constant. Or a method of managing the flocculation of the raw material using additive chemicals such as a dispersant, a texture control additive, a retention and a drainage aid. However, it is not limited to these methods.

  The support constituting the deodorant inkjet recording sheet of the present invention is provided with a polyolefin resin so that at least the surface of the base paper on which the ink receiving layer is formed (that is, one side or both sides of the base paper) is coated. It can be suitably configured.

The layer thickness of the polyolefin resin on the side where the ink receiving layer is formed is preferably in the range of 20 to 60 μm. More preferably, it is 35-60 micrometers. When the layer thickness is within this range, a photographic texture with excellent gloss and excellent gloss can be obtained, which is effective in improving productivity and reducing costs.
Especially, the aspect which made the layer thickness the range of 40-55 micrometers is preferable.

  When a polyolefin resin layer is provided on the surface of one side or both sides of the base paper, that is, in the production of a support coated with a resin such as a support for photographic paper, there are melt extrusion, wet lamination, and dry lamination. Melt extrusion is most preferred. When the polyolefin resin layer is formed by melt extrusion, the base paper is pretreated before the polyolefin resin layer is melt-extruded onto the base paper in order to strengthen the adhesion between the base paper and the polyolefin resin layer. Is preferred. For example, a polyolefin resin extruded from an extrusion die on a running base paper is formed by forming a resin film so that the base paper is covered at the nip point between the nip roller and the cooling roller, and by niping and pressing. An extrusion laminating method (also referred to as an extrusion coating method) in which a resin film is laminated on a base paper is widely adopted.

  Examples of the pretreatment include an acid etching treatment using a mixed solution of chromic sulfate, a flame treatment using a gas flame, an ultraviolet irradiation treatment, a corona discharge treatment, a glow discharge treatment, and an anchor coat treatment such as an alkyl titanate, which can be freely selected. In particular, corona treatment is preferable from the viewpoint of simplicity. In the case of corona treatment, it is necessary to treat so that the contact angle with water is 70 ° or less.

  Known examples of the anchor coating agent include organic titanium, isocyanate (urethane) polyethyleneimine, polybutadiene, and the like. Specifically, as the organic titanium system, alkyl titanates such as tetraisopropyl titanate, tetrabutyl titanate and tetrastearyl titanate, titanium acylates such as butoxytitanium stearate, titanium chelates such as titanium acetylacetonate, etc. are known. Yes. Further, as the isocyanate type (urethane type), toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HMDI), xylylene diisocyanate (XDI), isophorone diisocyanate (IPDI) and the like are known.

  Particularly in the present invention, in the case of the extrusion laminating method, after the polyolefin resin is melt-extruded on the base paper, it is preferably passed through an elastic roll having a nip pressure of 2 MPa or more and a cooling roll to perform lamination. A resin layer can be formed.

In other words, fine pores (hereinafter referred to as “craters”) may be formed on the surface of the resin film laminated on the base paper. However, when the number of craters is large, the appearance is not only impaired, but also glossiness is exhibited. Product value is significantly reduced due to the decline. The occurrence of this crater is due to the influence of the entrained air generated when the cooling roller rotates, and the entrained air accumulates in the area between the resin film and the cooling roller, causing a concave dent in the resin film. ing. The smaller the nip pressure between the elastic roll and the cooling roll, and the greater the line speed during lamination, the thinner the resin film, the lower the resin discharge temperature from the extrusion die, and the base paper The rougher the surface roughness, the more likely the craters are generated.
Therefore, by setting the nip pressure between the elastic roll and the cooling roll to 2 MPa or more, generation of craters can be suppressed, and smooth and smooth flatness can be ensured. Preferably, the nip pressure is 3 MPa or more, and the upper limit is 8 MPa.

As the polyolefin resin provided on the base paper, for example, an α-olefin homopolymer such as polyethylene and polypropylene, a mixture of these various polymers, or a random copolymer of ethylene and vinyl alcohol is preferable.
As the polyethylene, for example, LDPE (low density polyethylene), HDPE (high density polyethylene), and L-LDPE (linear low density polyethylene) can be used alone or in combination. When using polyethylene, the melt flow rate before processing is a value measured according to JIS 7201, and preferably 1.2 to 12 g / 10 min.

  When a polyolefin layer made of polyolefin (for example, polyethylene), for example, a polyethylene layer is provided, the polyethylene layer on the side on which the ink receiving layer of the base paper is formed when producing a deodorant inkjet recording sheet is generally widely used. As is the case with photographic paper, it is preferred to add rutile or anatase type titanium oxide, fluorescent whitening agent, ultramarine to polyethylene to improve opacity, whiteness and hue. Here, as a titanium oxide content, about 3-20 mass% is preferable with respect to polyethylene, and 4-13 mass% is more preferable.

  Further, an undercoat layer can be provided on the polyolefin layer for the purpose of imparting adhesion to an ink receiving layer responsible for image recording. As the undercoat layer, aqueous polyester, gelatin and polyvinyl alcohol (PVA) are preferable, and the thickness of the undercoat layer is preferably from 0.01 to 5 μm.

  The base paper in the present invention is a polyolefin resin-coated paper (for example, polyethylene-coated paper) when at least part of the surface on one side where the ink receiving layer is formed or each surface on both sides is coated with polyolefin (for example, polyethylene). ), And can be used as glossy paper. Also, when a polyolefin such as polyethylene is melt-extruded onto a base paper and coated, a so-called molding process is performed to obtain a normal photographic printing paper. It can also be used as a support having a matte surface or a silky surface.

  A back coat layer can also be provided on the surface of the base paper constituting the deodorant inkjet recording sheet of the present invention on the side opposite to the side on which the ink receiving layer is formed. This back coat layer can be constituted by adding and containing a white pigment, an aqueous binder, and other components.

  Examples of white pigments that can be added to the backcoat layer include light calcium carbonate, heavy calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, and silicic acid. White inorganic pigments such as aluminum, 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, Examples thereof include organic pigments such as styrene plastic pigment, acrylic plastic pigment, polyethylene, microcapsule, urea resin, and melamine resin.

  Examples of the aqueous binder that can be added to the backcoat layer include styrene / maleate copolymer, styrene / acrylate copolymer, polyvinyl alcohol, silanol-modified polyvinyl alcohol, starch, cationized starch, casein, gelatin, Examples thereof include water-soluble polymers such as carboxymethyl cellulose, hydroxyethyl cellulose and polyvinyl pyrrolidone, and water-dispersible polymers such as styrene butadiene latex and acrylic emulsion.

  Examples of other components that can be added to the backcoat layer include an antifoaming agent, an antifoaming agent, a dye, a fluorescent brightening agent, an antiseptic, and a water-proofing agent.

Next, the configuration other than the support constituting the deodorant inkjet recording sheet will be described in detail.
The deodorant inkjet recording sheet of the present invention has at least one ink-receiving layer on at least one of the supports, and has other layers as necessary.

[Ink receiving layer]
The ink receiving layer contains at least a mordant and silica. It is an embodiment that preferably contains a water-soluble resin, and more preferably contains a crosslinking agent capable of crosslinking the water-soluble resin. Moreover, it can comprise using other components (surfactant etc.) as needed.

  The ink receiving layer has a porous structure by containing the silica, thereby improving the ink absorption performance. In particular, when the solid content in the ink-receiving layer of silica is 50% by mass or more, more preferably more than 60% by mass, it is possible to obtain a more favorable porous structure, and the ink absorbability is further improved. be able to. Here, the solid content in the ink receiving layer of silica is a content calculated based on components other than water in the composition constituting the ink receiving layer.

  The porous ink-receiving layer is a layer having a porosity of 50 to 75%, preferably 60 to 70%. If the porosity is 50% or less, ink absorbability may be insufficient, and if it is 75% or more, a problem of powder falling due to insufficient binder may occur. Moreover, it is preferable that the layer thickness of an ink receiving layer is 20-40 micrometers from the quality of a deodorant inkjet recording sheet.

-Fine particles-
The ink receiving layer can contain other fine particles in addition to the silica. Hereinafter, unless otherwise specified, silica will be described as one of the fine particles.
As the fine particles, either organic fine particles or inorganic fine particles can be used. Preferred examples of the organic fine particles include polymer fine particles obtained by, for example, emulsion polymerization, microemulsion polymerization, soap-free polymerization, seed polymerization, dispersion polymerization, suspension polymerization, and the like. Specifically, polyethylene, polypropylene, Examples include polystyrene, polyacrylate, polyamide, silicon resin, phenol resin, natural polymer powder, latex or emulsion polymer fine particles, and the like.

  Examples of the inorganic fine particles include silica fine particles, colloidal silica, titanium dioxide, barium sulfate, calcium silicate, zeolite, kaolinite, halloysite, mica, talc, calcium carbonate, magnesium carbonate, calcium sulfate, pseudoboehmite, zinc oxide, Examples thereof include zinc hydroxide, alumina, aluminum silicate, calcium silicate, magnesium silicate, zirconium oxide, zirconium hydroxide, cerium oxide, lanthanum oxide, and yttrium oxide.

  Among these, inorganic fine particles are preferable from the viewpoint of ink absorbability and image stability, and silica fine particles, colloidal silica, alumina fine particles, or pseudoboehmite are preferable from the viewpoint of forming a better porous structure. The fine particles may be used as primary particles or in a state where secondary particles are formed. The average primary particle size of these fine particles is preferably 2 μm or less, and more preferably 200 nm or less.

  Among these, silica fine particles are generally roughly classified into wet method particles and dry method (vapor phase method) particles according to the production method. In the wet method, a method is mainly used in which active silica is produced by acid decomposition of silicate, and this is appropriately polymerized and coagulated and precipitated to obtain hydrous silica. On the other hand, the gas phase method is a method by high-temperature gas phase hydrolysis of silicon halide (flame hydrolysis method), a method in which silica sand and coke are heated and reduced by an arc in an electric furnace and oxidized with air. The method of obtaining anhydrous silica by the (arc method) is the mainstream, and the “gas phase method silica” means anhydrous silica fine particles obtained by the gas phase method. As the silica fine particles in the present invention, gas phase method silica fine particles are particularly preferable.

Vapor phase silica is different from hydrous silica in terms of the density of silanol groups on the surface, the presence or absence of vacancies, etc., and exhibits different properties, but is suitable for forming a three-dimensional structure with a high porosity. The reason for this is not clear, but in the case of hydrous silica, the density of silanol groups on the surface of the fine particles is high at 5 to 8 / nm ² , and the silica fine particles tend to aggregate closely (aggregate). In the case of the method silica, the density of silanol groups on the surface of the fine particles is 2 to 3 / nm ² , so that it is sparse soft aggregation (flocculate), and as a result, it is assumed that the structure has a high porosity. Is done.

  Since the vapor phase silica has a particularly large specific surface area, the ink absorption and retention efficiency is high, and since the refractive index is low, transparency can be imparted to the receiving layer by dispersing it to an appropriate particle size. It is characterized by high color density and good color development. The transparency of the receiving layer is important not only for applications that require transparency, such as OHP, but also for obtaining high color density and good color development gloss even when applied to recording media such as photo glossy paper. It is.

  The average primary particle size of the vapor phase silica is preferably 30 nm or less, more preferably 20 nm or less, particularly preferably 10 nm or less, and most preferably 3 to 10 nm. Vapor phase silica is easy to adhere to each other by hydrogen bonds with silanol groups, so that when the average primary particle size is 30 nm or less, a structure with a large porosity can be suitably formed, and ink absorption characteristics are effective. Can be improved.

  Silica fine particles may be used in combination with the other fine particles described above. When the other fine particles and the vapor phase silica are used in combination, the content of the vapor phase silica in all the fine particles is preferably 30% by mass or more, and more preferably 50% by mass or more.

As the inorganic fine particles, alumina fine particles, alumina hydrate, a mixture or a composite thereof are also preferable. Of these, alumina hydrate is preferable because it absorbs and fixes ink well, and pseudoboehmite (Al ₂ O ₃ .nH ₂ O) is particularly preferable. Alumina hydrates can be used in various forms, but it is preferable to use sol boehmite as a raw material because a smooth layer can be easily obtained.

  About the pore structure of pseudo boehmite, the average pore radius is preferably 1 to 25 nm, and more preferably 2 to 10 nm. The pore volume is preferably 0.3 to 2.0 ml / g, more preferably 0.5 to 1.5 ml / g. Here, the pore radius and the pore volume are measured by a nitrogen adsorption / desorption method, and can be measured using, for example, a gas adsorption / desorption analyzer (for example, trade name “Omni Soap 369” manufactured by Coulter).

  Among the alumina fine particles, vapor-phase method alumina fine particles are preferable because of their large specific surface area. The average primary particle diameter of the vapor phase alumina fine particles is preferably 50 nm or less, and more preferably 20 nm or less. Furthermore, colloidal silica having an average primary particle size of 50 nm or less is also preferable.

  The above-mentioned fine particles are, for example, JP-A-10-81064, JP-A-10-119423, JP-A-10-157277, JP-A-10-217601, JP-A-11-348409, JP-A-2001-138621, JP-A-2000-43401. 2000-212235, 2000-309157, 2001-96897, 2001-138627, JP-A-11-91242, 8-2087, 8-2090, 8-2091, The embodiments disclosed in JP-A-8-2093, JP-A-8-174992, JP-A-11-192777, JP-A-2001-301314 and the like can also be preferably used.

-Water-soluble resin-
As described above, the ink receiving layer preferably contains a water-soluble resin. Examples of the water-soluble resin include a polyvinyl alcohol resin [polyvinyl alcohol (PVA) which is a resin having a hydroxy group as a hydrophilic structural unit. ), Acetoacetyl-modified polyvinyl alcohol, cation-modified polyvinyl alcohol, anion-modified polyvinyl alcohol, silanol-modified polyvinyl alcohol, polyvinyl acetal, etc.], cellulose resins [methyl cellulose (MC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), carboxymethyl cellulose (CMC), hydroxypropylcellulose (HPC), hydroxyethylmethylcellulose, hydroxypropylmethylcellulose, etc.], chitins, chitosans, Demp , Resins having an ether bond [polyethylene oxide (PEO), polypropylene oxide (PPO), polyethylene glycol (PEG), polyvinyl ether (PVE), etc.], resins having a carbamoyl group [polyacrylamide (PAAM), polyvinylpyrrolidone (PVP) , Polyacrylic acid hydrazide, etc.]. Among these, polyvinyl alcohol resins, cellulose resins, resins having an ether bond, resins having a carbamoyl group, resins having a carboxyl group, and gelatins are preferable.
Moreover, the polyacrylic acid salt which has a carboxyl group as a dissociable group, maleic acid resin, alginate, gelatins, etc. can be mentioned.

  Among these, polyvinyl alcohol resin is particularly preferable. Examples of the polyvinyl alcohol include Japanese Patent Publication No. 4-52786, Japanese Patent Publication No. 5-67432, Japanese Patent Publication No. 7-29479, Japanese Patent No. 2537827, Japanese Patent Publication No. 7-57553, Japanese Patent No. 2502998, and Japanese Patent No. 3053231. JP-A-63-176173, JP-A-2604367, JP-A-7-276787, JP-A-9-207425, JP-A-11-58941, JP-A-2000-135858, JP-A-2001-205924, JP 2001-287444, JP 62-278080, JP 9-39373, JP 2750433, JP 2000-18801, JP 2001-213045, JP 2001-328345, JP 8 -324105, JP-A-11-348417, etc. It is below.

  These water-soluble resins may be used alone or in combination of two or more. As content of the said water-soluble resin, 9-40 mass% is preferable with respect to the total solid content mass of an ink receiving layer, and 12-33 mass% is more preferable.

Each of the water-soluble resin and the fine particles constituting the ink receiving layer may be a single material or a mixed system of a plurality of materials.
From the viewpoint of maintaining transparency, the type of water-soluble resin combined with the fine particles, particularly silica fine particles, is important. When the gas phase method silica is used, the water-soluble resin is preferably a polyvinyl alcohol resin, more preferably a polyvinyl alcohol resin having a saponification degree of 70 to 100%, and a saponification degree of 80 to 99.5. % Of polyvinyl alcohol resin is particularly preferable.

The polyvinyl alcohol-based resin has a hydroxyl group in its structural unit, and since this hydroxyl group and the surface silanol group of the silica fine particle form a hydrogen bond, a three-dimensional network having a secondary particle of the silica fine particle as a network chain unit. It becomes easy to form a structure. By forming this three-dimensional network structure, it is considered that a porous ink receiving layer having a high porosity and sufficient strength is formed.
In ink jet recording, the porous ink receiving layer obtained as described above can absorb ink rapidly by a capillary phenomenon, and can form dots with good roundness without ink bleeding.

  In addition, the polyvinyl alcohol resin may be used in combination with the other water-soluble resin. When the other water-soluble resin and the polyvinyl alcohol resin are used in combination, the content of the polyvinyl alcohol resin in the total water-soluble resin is preferably 50% by mass or more, and more preferably 70% by mass or more.

<Content ratio of fine particles and water-soluble resin>
The mass ratio [PB ratio; = x / y] of the mass (x) of the fine particles and the mass (y) of the water-soluble resin greatly affects the film structure and film strength of the ink receiving layer. That is, as the mass ratio (PB ratio) increases, the porosity, pore volume, and surface area (per unit mass) increase, but the density and strength tend to decrease.
As the PB ratio (x / y) in the ink receiving layer, the decrease in film strength and cracking during drying caused by the PB ratio being too large are prevented, and the PB ratio is too small, From the viewpoint of preventing the ink absorbability from being lowered due to the void being easily blocked by the resin and decreasing the porosity, 1.5 to 10 is preferable.

  In addition, since stress may be applied to the deodorant inkjet recording sheet when passing through the conveyance system of the inkjet printer, the ink receiving layer needs to have sufficient film strength and is cut into a sheet shape. When processing, the ink receiving layer needs to have sufficient film strength from the viewpoint of preventing the ink receiving layer from cracking or peeling off. In consideration of these, the PB ratio is more preferably 5 or less, and more preferably 2 or more from the viewpoint of ensuring high-speed ink absorbability in an inkjet printer.

For example, a coating solution in which gas phase method silica fine particles having an average primary particle size of 20 nm or less and a water-soluble resin are completely dispersed in an aqueous solution at a PB ratio (x / y) of 2 to 5 is applied on a support and dried. In this case, a three-dimensional network structure is formed in which the secondary particles of vapor phase silica fine particles are network chains, the average pore diameter is 25 nm or less, the porosity is 50 to 80%, and the pore specific volume is 0.5 ml / A translucent porous membrane having a specific surface area of 100 m ² / g or more can be easily formed.

-Mordant-
In the present invention, a mordant is contained in the ink receiving layer in order to further improve the water resistance and aging resistance of the formed image, and to improve the adsorptivity of malodorous components, particularly acetic acid malodorous components. Is preferred.
As the mordant, any of an organic mordant such as a cationic polymer (cationic mordant) and an inorganic mordant such as a water-soluble metal compound can be used. Of these, organic mordants are preferable, and cationic mordants are particularly preferable.

  The presence of the mordant in at least the upper layer of the ink receiving layer allows interaction with the liquid ink having an anionic dye as a coloring material, thereby stabilizing the coloring material and preventing water resistance and aging resistance. Further improvements can be made.

  In this case, it may be contained in either the ink receiving layer coating liquid (first liquid) or the basic solution (second liquid) when forming the ink receiving layer, but inorganic fine particles (especially gas phase method silica). It is preferable to contain and use in the 2nd liquid used as a liquid different from the liquid containing. That is, when the mordant is added directly to the ink receiving layer coating solution, aggregation may occur in the presence of an anion charge-containing silica vapor, but the mordant containing solution and the ink receiving layer coating solution are respectively If the method of independently preparing and coating each is employed, it is not necessary to consider the aggregation of inorganic fine particles, and the range of mordant selection is expanded.

As the cationic mordant, a polymer mordant having a primary to tertiary amino group or a quaternary ammonium base as a cationic functional group is preferably used, but a cationic non-polymer mordant is also used. be able to.
Examples of the polymer mordant include a homopolymer of a monomer having a primary to tertiary amino group and a salt thereof, or a quaternary ammonium base (hereinafter referred to as “mordant monomer”), the mordant monomer, Those obtained as copolymers or condensation polymers with other monomers (hereinafter referred to as “non-mordant polymer”) are preferred. These polymer mordants can be used in any form of a water-soluble polymer or water-dispersible latex particles.

  Examples of the mordant monomer include trimethyl-p-vinylbenzylammonium chloride, trimethyl-m-vinylbenzylammonium chloride, triethyl-p-vinylbenzylammonium chloride, triethyl-m-vinylbenzylammonium chloride, N, N-dimethyl- N-ethyl-Np-vinylbenzylammonium chloride, N, N-diethyl-N-methyl-Np-vinylbenzylammonium chloride, N, N-dimethyl-Nn-propyl-Np-vinylbenzyl Ammonium chloride, N, N-dimethyl-Nn-octyl-Np-vinylbenzylammonium chloride, N, N-dimethyl-N-benzyl-Np-vinylbenzylammonium chloride, N, N-diethyl-N Benzyl-Np-vinylbenzylammonium chloride, N, N-dimethyl-N- (4-methyl) benzyl-Np-vinylbenzylammonium chloride, N, N-dimethyl-N-phenyl-Np-vinyl Benzylammonium chloride;

Trimethyl-p-vinylbenzylammonium bromide, trimethyl-m-vinylbenzylammonium bromide, trimethyl-p-vinylbenzylammonium sulfonate, trimethyl-m-vinylbenzylammonium sulfonate, trimethyl-p-vinylbenzylammonium acetate, trimethyl-m-vinyl Benzylammonium acetate, N, N, N-triethyl-N-2- (4-vinylphenyl) ethylammonium chloride, N, N, N-triethyl-N-2- (3-vinylphenyl) ethylammonium chloride, N, N-diethyl-N-methyl-N-2- (4-vinylphenyl) ethylammonium chloride, N, N-diethyl-N-methyl-N-2- (4-vinylphenyl) ethylammonium chloride Tate;

N, N-dimethylaminoethyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, N, N-diethylaminopropyl (meth) acrylate, N, N- Methyl chloride, ethyl chloride, methyl bromide of dimethylaminoethyl (meth) acrylamide, N, N-diethylaminoethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, N, N-diethylaminopropyl (meth) acrylamide , Quaternized products of ethyl bromide, methyl iodide or ethyl iodide, or sulfonates, alkyl sulfonates, acetates or alkyl carboxylates substituted with their anions.

  Specific examples of the compound include monomethyl diallylammonium chloride, trimethyl-2- (methacryloyloxy) ethylammonium chloride, triethyl-2- (methacryloyloxy) ethylammonium chloride, trimethyl-2- (acryloyloxy) ethylammonium chloride, Triethyl-2- (acryloyloxy) ethylammonium chloride, trimethyl-3- (methacryloyloxy) propylammonium chloride, triethyl-3- (methacryloyloxy) propylammonium chloride, trimethyl-2- (methacryloylamino) ethylammonium chloride, triethyl- 2- (methacryloylamino) ethylammonium chloride, trimethyl-2- (acryloylua) C) ethylammonium chloride, triethyl-2- (acryloylamino) ethylammonium chloride, trimethyl-3- (methacryloylamino) propylammonium chloride, triethyl-3- (methacryloylamino) propylammonium chloride, trimethyl-3- (acryloylamino) Propylammonium chloride, triethyl-3- (acryloylamino) propylammonium chloride;

N, N-dimethyl-N-ethyl-2- (methacryloyloxy) ethylammonium chloride, N, N-diethyl-N-methyl-2- (methacryloyloxy) ethylammonium chloride, N, N-dimethyl-N-ethyl- 3- (acryloylamino) propylammonium chloride, trimethyl-2- (methacryloyloxy) ethylammonium bromide, trimethyl-3- (acryloylamino) propylammonium bromide, trimethyl-2- (methacryloyloxy) ethylammonium sulfonate, trimethyl-3- And (acryloylamino) propylammonium acetate.
Other examples of the copolymerizable monomer include N-vinylimidazole and N-vinyl-2-methylimidazole.

In addition, allylamine, diallylamine, derivatives thereof, salts and the like can also be used. Examples of such compounds include allylamine, allylamine hydrochloride, allylamine acetate, allylamine sulfate, diallylamine, diallylamine hydrochloride, diallylamine acetate, diallylamine sulfate, diallylmethylamine and salts thereof (for example, Hydrochloride, acetate, sulfate, etc.), diallylethylamine and salts thereof (for example, hydrochloride, acetate, sulfate, etc.), diallyldimethylammonium salt (chloride, acetic acid as counter anions of the salt) Ion sulfate, etc.). In addition, since these allylamines and diallylamine derivatives are inferior in polymerizability in the amine form, it is a general production method to polymerize in the form of a salt and desalting as required.
In addition, a polymerization unit such as N-vinylacetamide, N-vinylformamide or the like, which is converted into a vinylamine unit by hydrolysis after polymerization, and a salt thereof can be used.

The non-mordant monomer does not contain a basic or cationic moiety such as a primary to tertiary amino group and a salt thereof, or a quaternary ammonium base, and does not interact with a dye in an inkjet ink. Or a monomer having a substantially small interaction.
Examples of the non-mordant monomer include (meth) acrylic acid alkyl ester; (meth) acrylic acid cycloalkyl ester such as cyclohexyl (meth) acrylate; (meth) acrylic acid aryl ester such as phenyl (meth) acrylate; Aralkyl esters such as (meth) benzyl acrylate; Aromatic vinyls such as styrene, vinyl toluene and α-methylstyrene; Vinyl esters such as vinyl acetate, vinyl propionate and vinyl versatic acid; Allyl esters such as allyl acetate Halogen-containing monomers such as vinylidene chloride and vinyl chloride; vinyl cyanide such as (meth) acrylonitrile; olefins such as ethylene and propylene; and the like.

  The (meth) acrylic acid alkyl ester is preferably a (meth) acrylic acid alkyl ester having 1 to 18 carbon atoms in the alkyl moiety, specifically, for example, methyl (meth) acrylate or ethyl (meth) acrylate. Propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, hexyl (meth) acrylate, (meth) Examples include octyl acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, and the like. Among these, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, and hydroxyethyl methacrylate are preferable. The non-mordant monomer can also be used alone or in combination of two or more.

Further, as a cationic mordant, polydiallyldimethylammonium chloride, polymethacryloyloxyethyl-β-hydroxyethyldimethylammonium chloride, polyethyleneimine, polyallylamine and derivatives thereof, polyamide-polyamine resin, cationized starch, dicyandiamide formalin condensate, dimethyl Addition of 2-hydroxypropylammonium salt polymer, polyamidine, polyvinylamine, dicyandiamide-formalin polycondensate, dicyanamide-cachinic resin, dicyanamide-diethylenetriamine-polycondensate, polyamine-type katine resin, epichlorohydrin-dimethylamine Polymer, dimethyldialin ammonium chloride-SO ₂ copolymer, diallylamine salt-SO ₂ copolymer, A (meth) acrylate-containing polymer having a quaternary ammonium base-substituted alkyl group in the ester portion, a styryl polymer having a quaternary ammonium base-substituted alkyl group, and the like can also be mentioned as preferable examples.

  Specific examples of the cationic mordant include JP-A Nos. 48-28325, 54-74430, 54-124726, 55-22766, 55-142339, 60-23850, and the like. 60-23851, 60-23852, 60-23853, 60-57836, 60-60643, 60-118834, 60-122940, 60-122941, 60- Nos. 122942, 60-235134, JP-A-1-161236, U.S. Pat.Nos. 2,484,430, 2,548,564, 3,148,061, 3,309,690, 4,115,124, 4,124,386, 4,193,800, 4,227,8353 Nos. 4282305 and 4450224, JP No. 161236, No. 10-81064, No. 10-119423, No. 10-157277, No. 10-217601, No. 11-348409, JP-A No. 2001-138621, No. 2000-43401, No. 2000- 211235, 2000-309157, 2001-96897, 2001-138627, JP-A-11-91242, 8-2087, 8-2090, 8-2091, 8-2093 No. 8-1744992, No. 11-192777, JP-A No. 2001-301314, JP-B No. 5-35162, No. 5-35163, No. 5-35164, No. 5-88846, JP-A No. 7-8846 No. 118333, Japanese Patent Laid-Open No. 2000-344990, etc., Japanese Patent Nos. 2648847, 266167 Include those such as described in the specification of the issue, and the like. Among these, polyallylamine and derivatives thereof are preferable, and diallyldialkyl cationic polymers are preferable in terms of structure.

  As the polyallylamine or a derivative thereof, various known allylamine polymers and derivatives thereof can be used. Examples of such derivatives include salts of polyallylamine and acids (acids include inorganic acids such as hydrochloric acid, sulfuric acid, phosphoric acid and nitric acid, methanesulfonic acid, toluenesulfonic acid, acetic acid, propionic acid, cinnamic acid, (meth) An organic acid such as acrylic acid, or a combination thereof, or a salt of only a part of allylamine), a derivative of polyallylamine by a polymer reaction, a copolymer of polyallylamine and another copolymerizable monomer Specific examples of the monomer include (meth) acrylic acid esters, styrenes, (meth) acrylamides, acrylonitrile, vinyl esters and the like.

  Specific examples of polyallylamine and derivatives thereof include JP-B-62-31722, JP-B-2-14364, JP-B-63-43402, JP-A-63-43403, JP-A-63-45721, and JP-A-63-29881. Japanese Patent Publication No. 1-26362, No. 2-56365, No. 2-57084, No. 4-41686, No. 6-2780, No. 6-45649, No. 6-15592, No. 4-68622, Patents No. 3199227, No. 3008369, JP-A-10-330427, JP-A-11-21321, JP-A-2000-281728, JP-A-2001-106636, JP-A-62-256801, JP-A-7-173286, 7-213897, 9-235318, 9-302026, 11-21321, WO99 / 21901 , No. WO99 / 19372, JP-A-5-140213, compounds described in JP Kohyo No. 11-506488, and the like.

Among the above-mentioned cationic mordants, diallyl dialkyl cationic polymers are preferable, and diallyl dimethyl cationic polymers are particularly preferable.
Moreover, as the dispersant, a polydiallylamine derivative described in the section of the water-soluble organic cation compound (water-soluble organic cation compound having a polydiallylamine derivative as a constituent unit) can be given as a suitable example.
The cationic mordant is preferably a cationic polymer having a weight average molecular weight of 60000 or less, particularly 40000 or less, from the viewpoint of dispersibility, particularly prevention of thickening.
The cationic mordant is also useful as the fine particle dispersant described above.

  Further, when added to the ink receiving layer coating solution, the sulfate ion concentration in the coating solution is preferably 1.5% by mass or less from the viewpoint of preventing thickening of the solution. This sulfate ion is contained in the polymerization initiator at the time of production of the cationic polymer, and since it remains in the polymer, the cationic mordant is formed using a polymerization initiator that does not emit sulfate ion. Is desirable.

  Examples of the inorganic mordant include polyvalent water-soluble metal salts and hydrophobic metal salt compounds. Specifically, for example, magnesium, aluminum, calcium, scandium, titanium, vanadium, manganese, iron, nickel, copper, zinc, gallium, germanium, strontium, yttrium, zirconium, molybdenum, indium, barium, lanthanum, cerium, praseodymium , Neodymium, samarium, europium, gadolinium, dysprosium, erbium, ytterbium, hafnium, tungsten, bismuth metal salts or complexes.

  Specific examples include 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, and second chloride. Copper, ammonium chloride (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 amidosulfate tetrahydrate, aluminum sulfate, aluminum alum, basic polyaluminum hydroxide, aluminum sulfite, aluminum thiosulfate, polyaluminum chloride, aluminum nitrate nonahydrate, aluminum chloride hexahydrate , Ferrous bromide, ferrous chloride, ferric chloride, sulfur Ferrous sulfate, ferric sulfate, zinc phenolsulfonate, zinc bromide, zinc chloride, zinc nitrate hexahydrate, zinc sulfate, titanium tetrachloride, tetraisopropyl titanate, titanium acetylacetonate, titanium lactate, zirconium acetylacetate , Zirconyl acetate, zirconyl sulfate, ammonium zirconium carbonate, zirconyl stearate, zirconyl octylate, zirconyl nitrate, zirconium oxychloride, zirconium zirconium chloride, chromium acetate, chromium sulfate, magnesium sulfate, magnesium chloride hexahydrate, magnesium citrate Nine hydrate, sodium phosphotungstate, sodium tungsten citrate, 12 tungstophosphoric acid n hydrate, 12 tungstosilicic acid 26 hydrate, molybdenum chloride, 12 molybdophosphoric acid n hydrate, gallium nitrate , Germanium nitrate, strontium nitrate, yttrium acetate, yttrium chloride, yttrium nitrate, indium nitrate, lanthanum nitrate, lanthanum chloride, lanthanum acetate, lanthanum benzoate, cerium chloride, cerium sulfate, cerium octylate, praseodymium nitrate, neodymium nitrate, samarium nitrate , Europium nitrate, gadolinium nitrate, dysprosium nitrate, erbium nitrate, ytterbium nitrate, hafnium chloride, bismuth nitrate, and the like.

Among inorganic mordants, aluminum-containing compounds, titanium-containing compounds, zirconium-containing compounds, and group IIIB series metal compounds (salts or complexes) of the periodic table are preferable.
The aluminum-containing compound is preferably polyaluminum hydroxide from the viewpoint of malodor component adsorption, and the compound is the same as the compound described in the above-mentioned water-soluble polyvalent metal compound.
The addition amount in the ink receiving layer of the mordant is preferably ^{0.01~5g / m 2, 0.1~3g / m} 2 is more preferable.

-Crosslinking agent-
The ink receiving layer is a porous layer in which a coating layer containing fine particles and a water-soluble resin further contains a crosslinking agent capable of crosslinking the water-soluble resin, and is cured by a crosslinking reaction between the crosslinking agent and the water-soluble resin. Some embodiments are preferred.

Boron compounds are preferred for crosslinking the water-soluble resin, particularly polyvinyl alcohol resin. Examples of the boron compound include borax, boric acid, borates (for example, orthoborate, InBO ₃ , ScBO ₃ , YBO ₃ , LaBO ₃ , Mg ₃ (BO ₃ ) ₂ , Co ₃ (BO ₃ ) ₂ , two Borate (eg, Mg ₂ B ₂ O ₅ , Co ₂ B ₂ O ₅ ), metaborate (eg, LiBO ₂ , Ca (BO ₂ ) ₂ , NaBO ₂ , KBO ₂ ), tetraborate (eg, Na ₂ B ₄ O ₇ · 10H ₂ O), pentaborate (for example, KB ₅ O ₈ · 4H ₂ O, Ca ₂ B ₆ O ₁₁ · 7H ₂ O, CsB ₅ O ₅ ), etc. Of these, borax, boric acid, and borate are preferable, and boric acid is particularly preferable in that a crosslinking reaction can be promptly caused.

As the crosslinking agent for the water-soluble resin, the following compounds other than the boron compound may be used.
For example, aldehyde compounds such as formaldehyde, glyoxal and glutaraldehyde; ketone compounds such as diacetyl and cyclopentanedione; bis (2-chloroethylurea) -2-hydroxy-4,6-dichloro-1,3,5- Active halogen compounds such as triazine and 2,4-dichloro-6-S-triazine sodium salt; divinylsulfonic acid, 1,3-vinylsulfonyl-2-propanol, N, N′-ethylenebis (vinylsulfonylacetamide) ), Active vinyl compounds such as 1,3,5-triacryloyl-hexahydro-S-triazine; N-methylol compounds such as dimethylolurea and methyloldimethylhydantoin; melamine resins (for example, methylolmelamine, alkylated methylolmelamine) ;Epoxy resin;

Isocyanate compounds such as 1,6-hexamethylene diisocyanate; Aziridine compounds described in US Pat. Nos. 3,017,280 and 2,983611; Carboximide compounds described in US Pat. No. 3,100,704; Glycerol triglycidyl Epoxy compounds such as ether; Ethyleneimino compounds such as 1,6-hexamethylene-N, N′-bisethyleneurea; Halogenated carboxaldehyde compounds such as mucochloric acid and mucophenoxycyclolic acid; 2,3-dihydroxy Dioxane-based compounds such as dioxane; titanium-containing aluminum sulfate, chromium alum, potassium alum, metal-containing compounds such as zirconyl acetate, chromium acetate, polyamine compounds such as tetraethylenepentamine, hydrazide compounds such as adipic acid dihydrazide, A low molecule or polymer containing two or more oxazoline groups.
The crosslinking agents may be used alone or in combination of two or more.

  In the crosslinking and curing, a coating liquid (hereinafter also referred to as “ink receiving layer coating liquid” or “first liquid”) and / or a base described below, which contains fine particles, a water-soluble resin, and the like to form an ink receiving layer. And (1) at the same time when the first liquid is applied to form a coating layer, or (2) during the drying of the coating layer formed by applying the first liquid. In any case before the coating layer exhibits reduced-rate drying, a basic solution having a pH of 7.1 or higher (hereinafter also referred to as “second liquid”) is applied to the coating layer. Is preferred.

The application of the cross-linking agent is preferably performed as follows when a boron compound is taken as an example. That is, when the ink receiving layer is a layer obtained by crosslinking and curing a coating layer coated with a coating solution (first solution) containing a water-soluble resin containing fine particles and polyvinyl alcohol, crosslinking curing is performed by (1) At the same time that one liquid is applied to form a coating layer, (2) any one of the coating layers formed by applying the first liquid and being dried and before the coating layer exhibits reduced-rate drying Sometimes, it is carried out by applying a basic solution (second liquid) having a pH of 7.1 or higher to the coating layer. The boron compound as the crosslinking agent may be contained in either the first liquid or the second liquid, and may be contained in both the first liquid and the second liquid.
1-50 mass% is preferable with respect to water-soluble resin, and, as for the usage-amount of a crosslinking agent, 5-40 mass% is more preferable.

-Other ingredients-
In addition to the above components, the ink-receiving layer or the coating solution for forming the ink-receiving layer (ink-receiving layer coating solution) may further include various known additives such as ultraviolet absorbers and antioxidants as necessary. Agent, optical brightener, monomer, polymerization initiator, polymerization inhibitor, anti-bleeding agent, preservative, viscosity stabilizer, antifoaming agent, surfactant, antistatic agent, matting agent, anti-curl agent, water resistance agent Etc. can be contained.

Other components may be used alone or in combination of two or more. Other components may be added after being water-solubilized, dispersed, polymer-dispersed, emulsified or formed into oil droplets, or may be encapsulated in microcapsules. As addition amount in the case of adding another component, 0.01-10 g / m < ² > is preferable.

  Further, for the purpose of improving the dispersibility of the inorganic fine particles, the inorganic surface may be treated with a silane coupling agent. The silane coupling agent includes an organic functional group (for example, a vinyl group, an amino group, an epoxy group, a mercapto group, a chloro group, an alkyl group, a phenyl group, an ester group, etc.) in addition to a coupling treatment site. Those having the following are preferred.

  In the present invention, an embodiment in which the ink receiving layer coating solution contains a surfactant is preferred. Surfactants here include any of cationic, anionic, nonionic, amphoteric, fluorine, and silicon surfactants.

  Examples of the nonionic surfactant include polyoxyalkylene alkyl ethers and polyoxyalkylene alkyl phenyl ethers (for example, diethylene glycol monoethyl ether, diethylene glycol diethyl ether, polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyalkylene ether) Ethylene nonylphenyl ether), oxyethylene / oxypropylene block copolymer, sorbitan fatty acid esters (for example, sorbitan monolaurate, sorbitan monooleate, sorbitan trioleate, etc.), polyoxyethylene sorbitan fatty acid esters (for example, polyoxyethylene) Sorbitan monolaurate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitant Oleate, etc.), polyoxyethylene sorbitol fatty acid esters (eg, polyoxyethylene sorbitol tetraoleate), glycerin fatty acid esters (eg, glycerol monooleate), polyoxyethylene glycerin fatty acid esters (polyoxymonostearate) Ethylene glycerol, monooleic acid polyoxyethylene glycerin, etc.), polyoxyethylene fatty acid esters (polyethylene glycol monolaurate, polyethylene glycol monooleate, etc.), polyoxyethylene alkylamine, acetylene glycols (eg, 2, 4, 7) , 9-tetramethyl-5-decyne-4,7-diol, and ethylene oxide adducts and propylene oxide adducts of the diols), and the like. Sharp emission alkyl ethers are preferable. The nonionic surfactant may be contained in the ink receiving layer coating solution.

  Examples of the amphoteric surfactant include amino acid type, carboxyammonium betaine type, sulfoammonium betaine type, ammonium sulfate betaine type, imidazolium betaine type, and the like, for example, US Pat. No. 3,843,368, Those described in JP-A-59-49535, JP-A-63-236546, JP-A-5-303205, JP-A-8-262742, and JP-A-10-282619 can be suitably used. As the amphoteric surfactant, an amino acid type amphoteric surfactant is preferable, and as the amino acid type amphoteric surfactant, as described in JP-A-5-303205, for example, an amino acid (glycine, glutamic acid, Histidine acid etc.) and N-aminoacyl acids and salts thereof into which long chain acyl groups have been introduced.

Examples of the anionic surfactant include fatty acid salts (for example, sodium stearate, potassium oleate), alkyl sulfate esters (for example, sodium lauryl sulfate, triethanolamine lauryl sulfate), and sulfonates (for example, sodium dodecylbenzenesulfonate). Alkyl sulfosuccinate (for example, sodium dioctyl sulfosuccinate), alkyl diphenyl ether disulfonate, alkyl phosphate, and the like.
Examples of the cationic surfactant include alkylamine salts, quaternary ammonium salts, pyridinium salts, imidazolium salts, and the like.

  Examples of the fluorosurfactant include compounds derived via an intermediate having a perfluoroalkyl group using a method such as electrolytic fluorination, telomerization, or oligomerization. Examples thereof include perfluoroalkyl sulfonates, perfluoroalkyl carboxylates, perfluoroalkyl ethylene oxide adducts, perfluoroalkyl trialkyl ammonium salts, perfluoroalkyl group-containing oligomers, and perfluoroalkyl phosphate esters.

  The silicone surfactant is preferably a silicone oil modified with an organic group, and can have a structure in which a side chain of a siloxane structure is modified with an organic group, a structure in which both ends are modified, or a structure in which one end is modified. Examples of the organic group modification include amino modification, polyether modification, epoxy modification, carboxyl modification, carbinol modification, alkyl modification, aralkyl modification, phenol modification, and fluorine modification.

  The total amount of the surfactant in the ink-receiving layer coating solution is preferably 0.001 to 2.0%, more preferably 0.01 to 1.0%.

  The ink-receiving layer is formed by applying a coating solution containing fine particles and a water-soluble resin to the support surface to form a coating layer, and further adding a crosslinking agent to the coating solution and / or the following basic solution, and ( 1) at the same time when the coating solution is applied to form a coating layer, or (2) during the drying of the coating layer formed by coating the coating solution and before the coating layer exhibits reduced-rate drying, In any case, it is preferably formed by a method (Wet-on-Wet method) in which a basic solution having a pH of 7.1 or higher is applied to the coating layer and the coating layer is crosslinked and cured. Here, the crosslinking agent capable of crosslinking the water-soluble resin is preferably contained in at least one or both of the coating solution and the basic solution. Providing the ink-receiving layer crosslinked and cured in this manner is preferable from the viewpoint of ink absorbability and prevention of film cracking.

  The mordant is desirably present so that the thickness of the mordant-existing portion from the surface of the receptor layer is 10 to 60% of the receptor layer thickness. For example, (1) a method of forming a coating layer containing the fine particles, a water-soluble resin, and a crosslinking agent, and applying a mordant-containing solution thereon, (2) a coating solution containing the fine particles, a water-soluble resin, and a mordant-containing solution. It can be formed by any method such as a method of applying multiple layers. The mordant-containing solution may contain inorganic fine particles, a water-soluble resin, a crosslinking agent, and the like.

  As described above, since a large amount of mordant is present in a predetermined part of the ink receiving layer, the ink-jet coloring material is sufficiently mordanted, color density, aging blur, gloss of printed part, and water resistance of characters and images after printing. This is preferable because ozone resistance is improved. Part of the mordant may be contained in the layer initially provided on the support, and in that case, the mordant to be applied later may be the same or different.

In the present invention, the ink-receiving layer coating liquid (first liquid) containing fine particles (for example, vapor phase silica) and a water-soluble resin (for example, polyvinyl alcohol) can be prepared, for example, as follows. . That is,
Fine particles such as vapor phase method silica are added to water together with a dispersant or the like (for example, silica fine particles in water are 10 to 20% by mass), pre-dispersed (primary dispersion) with a homomixer or the like, and then obtained dispersion The liquid is further dispersed (secondary dispersion) in, for example, one pass using a disperser such as an optimizer (manufactured by Sugino Machine Co., Ltd.), and then an aqueous polyvinyl alcohol (PVA) solution (for example, 1/3 of the above-mentioned gas phase method silica). Can be prepared by adding PVA of a moderate mass). In order to impart stability to the coating solution, it is preferable to adjust the pH to about 9.2 with aqueous ammonia or the like, or to use a dispersant. The obtained coating liquid is in a uniform sol state, and a porous ink-receiving layer having a three-dimensional network structure can be formed by coating this on a support by the following coating method and drying it.

  As the disperser used for dispersion, various conventionally known dispersers such as a colloid mill disperser, a high-speed rotating disperser, a medium stirring disperser (ball mill, sand mill, etc.), an ultrasonic disperser, and a high-pressure disperser are used. be able to. Among these, an ultrasonic disperser or a high-pressure disperser (particularly a high-pressure jet disperser) is preferable from the viewpoint of effectively dispersing the formed fine particles.

  Moreover, water, an organic solvent, or these mixed solvents can be used as a solvent in each process. Examples of the organic solvent that can be used for this coating include alcohols such as methanol, ethanol, n-propanol, i-propanol, and methoxypropanol, ketones such as acetone and methyl ethyl ketone, tetrahydrofuran, acetonitrile, ethyl acetate, and toluene. It is done.

Furthermore, a chaotic polymer can be used as the dispersant. Examples of the chaotic polymer include the aforementioned mordants. It is also preferable to use a silane coupling agent as the dispersant.
The amount of the dispersant added to the fine particles is preferably 0.1 to 30% by mass, and more preferably 1 to 10% by mass.

  The ink receiving layer coating solution is applied by a known coating method using, for example, an extrusion die coater, an air doctor coater, a bread coater, a rod coater, a knife coater, a squeeze coater, a reverse roll coater, a bar coater, or the like. Can do.

  A basic solution (second liquid) is applied to the coating layer at the same time as or after the coating of the ink receiving layer coating liquid (first liquid), and the second liquid is applied to the coating layer after coating. You may give before it comes to show decremental drying. That is, after the application liquid for the ink receiving layer (first liquid) is applied, the second liquid is introduced while the applied layer exhibits constant rate drying. This second liquid may contain a mordant.

  Here, “before the coating layer comes to show reduced drying” usually refers to a process for several minutes immediately after the coating of the coating liquid for the ink-receiving layer. This shows a phenomenon of “constant rate drying” in which the content of the solvent (dispersion medium) of the ink decreases in proportion to time. About the time which shows this "constant rate drying", it describes in chemical engineering handbook (pages 707-712, Maruzen Co., Ltd. issue, October 25, 1980), for example.

  As described above, after the application of the first liquid, the coating layer is dried until the coating layer exhibits a reduced rate of drying. This drying is generally performed at 40 to 180 ° C. for 0.5 to 10 minutes (preferably, 0 .5-5 minutes). The drying time naturally varies depending on the coating amount, but usually the above range is appropriate.

  As a method to give before the coating layer which consists of said 1st liquid comes to show a decreasing rate drying rate, (1) The method of further apply | coating 2nd liquid on a coating layer, (2) By methods, such as a spray The method of spraying, (3) The method of immersing the support body in which this application layer was formed in the 2nd liquid, etc. are mentioned.

  In the method (1), examples of the application method for applying the second liquid include curtain flow coater, extrusion die coater, air doctor coater, bread coater, rod coater, knife coater, squeeze coater, reverse roll coater, bar A known coating method such as a coater can be used. However, it is preferable to use a method in which the coater does not directly contact the already formed first coating layer, such as an extrusion die coater, a curtain flow coater, a bar coater or the like.

  After application | coating of a 2nd liquid, generally it heats at 40-180 degreeC for 0.5 to 30 minutes, and drying and hardening are performed. Especially, it is preferable to heat at 40-150 degreeC for 1 to 20 minutes.

  Further, when the basic solution (second liquid) is applied simultaneously with the application of the ink-receiving layer coating liquid (first liquid), the first liquid and the second liquid are brought into contact with the support. Thus, the ink receiving layer can be formed by simultaneously coating (multilayer coating) on the support, followed by drying and curing.

  The simultaneous coating (multilayer coating) can be performed by a coating method using, for example, an extrusion die coater or a curtain flow coater. After the simultaneous coating, the formed coating layer is dried. In this case, the drying is generally performed by heating the coating layer at 40 to 150 ° C. for 0.5 to 10 minutes, preferably 40 to 100. It is carried out by heating at a temperature of 0.5 to 5 minutes.

  When the simultaneous coating (multilayer coating) is performed by, for example, an extrusion die coater, the two types of coating liquid discharged at the same time are close to the discharge port of the extrusion die coater, that is, before moving onto the support. A multilayer is formed, and in that state, the multilayer is applied on the support. Since the two-layer coating liquid that has been layered before coating is likely to cause a crosslinking reaction at the interface between the two liquids when transferred to the support, the two liquids to be discharged are mixed in the vicinity of the discharge port of the extrusion die coater. As a result, thickening is likely to occur, which may hinder the application operation. Therefore, when applying simultaneously as mentioned above, it is preferable to apply a triple layer coating with a barrier layer solution (intermediate layer solution) interposed between the two solutions together with the application of the first solution and the second solution.

  The barrier layer solution can be selected without particular limitation. For example, an aqueous solution containing a trace amount of water-soluble resin, water, and the like can be given. The water-soluble resin is used in consideration of applicability for the purpose of a thickener and the like. For example, a cellulose resin (for example, hydroxypropylmethylcellulose, methylcellulose, hydroxyethylmethylcellulose) And polymers such as polyvinylpyrrolidone and gelatin. The barrier layer liquid may contain the mordant.

  After the ink receiving layer is formed on the support, the ink receiving layer is subjected to, for example, super calender, gloss calender, etc., and is subjected to calender treatment through the roll nip under heat and pressure, so that surface smoothness, glossiness, It is possible to improve transparency and coating strength. However, the calendar process may cause a decrease in the porosity (that is, the ink absorptivity may be decreased), so it is necessary to set conditions under which the decrease in the porosity is small.

As roll temperature in the case of performing a calendar process, 30-150 degreeC is preferable and 40-100 degreeC is more preferable.
Moreover, as a linear pressure between rolls at the time of a calendar process, 50-400 kg / cm is preferable and 100-200 kg / cm is more preferable.

The layer thickness of the ink receiving layer needs to be determined in relation to the void ratio in the layer since it needs to have an absorption capacity sufficient to absorb all droplets when used for inkjet recording. For example, when the ink amount is 8 nL / mm ² and the porosity is 60%, the layer thickness is preferably about 15 μm or more.
Considering this point, when used for inkjet recording, the thickness of the ink receiving layer is preferably 10 to 50 μm.

Further, the pore diameter of the ink receiving layer is preferably 0.005 to 0.030 μm, more preferably 0.01 to 0.025 μm in terms of median diameter.
The porosity and pore median diameter can be measured using a mercury porosimeter (trade name “Bore Sizer 9320-PC2” manufactured by Shimadzu Corporation).

In addition, the ink receiving layer is preferably excellent in transparency, as a guide, the haze value when the ink receiving layer is formed on a transparent film support is preferably 30% or less, More preferably, it is 20% or less.
The haze value can be measured using a haze meter (HGM-2DP: Suga Test Instruments Co., Ltd.).

  A polymer fine particle dispersion may be added to a constituent layer (for example, an ink receiving layer or a back layer) of the recording deodorant sheet obtained by the present invention. This polymer fine particle dispersion is used for the purpose of improving film properties such as dimensional stabilization, curling prevention, adhesion prevention, and film cracking prevention. The polymer fine particle dispersion is described in JP-A Nos. 62-245258, 62-1316648, and 62-110066. If a polymer fine particle dispersion having a low glass transition temperature (40 ° C. or lower) is added to the layer containing the mordant, cracking and curling of the layer can be prevented. Further, even when a polymer fine particle dispersion having a high glass transition temperature is added to the back layer, curling can be prevented.

A deodorant using jelly as a general deodorant requires a place to put it, is unsightly, and is not visually comfortable. In addition, it can be seen that general deodorant sheets and wallpaper are only existing designs and are clearly installed for deodorization purposes.
Compared with the conventional deodorant, the deodorant inkjet recording sheet of the present invention does not look like a deodorant at first glance, and the deodorizing effect can be obtained with the impression that the original photo-like image is displayed. Furthermore, even if the deodorizing effect is lost, it can be stored as a normal photo-like image, so there is an advantage that it can contribute to waste reduction and global warming.
In addition, the deodorant inkjet recording sheet of the present invention is fast-acting and long-lasting for components such as acetaldehyde, ammonia, hydrogen sulfide, and acetic acid, which are components of tobacco odor, in addition to formaldehyde generated from building materials, adhesives, and paints. Deodorizing function with excellent properties can be exhibited.

  EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to these Examples. In the examples, “part” and “%” are based on mass unless otherwise specified, and “polymerization degree” represents “weight average polymerization degree”.

[Example 1]
-Preparation of composite phyllosilicates-
In accordance with the method described in JP-A-1-151939, an aqueous solution containing sodium silicate and an aqueous solution containing zinc chloride and aluminum chloride are simultaneously poured into an amorphous silica slurry to cause a reaction. As a result, amorphous composite zinc phyllosilicate corresponding to SiO ₂ : 31 mol%, ZnO: 54 mol% and Al ₂ O ₃ : 15 mol% was obtained.

-Production of support-
50 parts of maple kraft pulp (LBKP) and 50 parts of acacia kraft pulp (LBKP) were beaten with a double disc refiner to obtain 330 ml of Canadian freeness (Canadian standard freeness).

  Subsequently, the obtained pulp slurry was 20% by weight of the composite zinc phyllosilicate per pulp, 1.5% of cationic starch (CATO304L, manufactured by Nippon NSC Co., Ltd.), anionic polyacrylamide (DA4104, Seiko PMC Co., Ltd.) )) 0.17%, alkyl ketene dimer (size pine K, manufactured by Arakawa Chemical Co., Ltd.) 0.35%, epoxidized behenamide 0.35%, and polyamide polyamine epichlorohydrin (Arafix 100, Arakawa Chemical ( 0.40%), and then 0.15% of an antifoaming agent was further added.

The pulp slurry prepared as described above was dehydrated and dried using a long paper machine, and a base paper having a basis weight of 200 g / m ² and a thickness of 190 μm was made to obtain a base paper.
Specifically, in the step of drying by pressing the felt surface of the web through the dryer canvas, the tensile force of the dryer canvas is set to 1.6 kg / cm, and then drying is performed. Polyvinyl alcohol (KL-118, manufactured by Kuraray Co., Ltd.) was applied to both sides so as to be 1.0 g / m ² and dried, and machine calendar treatment was performed.

  After the corona discharge treatment was performed on the felt surface side (front side) of the obtained base paper, anatase-type titanium dioxide 10%, a trace amount of ultramarine (manufactured by Tokyo Ink), and a fluorescent brightener ( Whitefloor PSN conc, manufactured by Nippon Chemical Industry Co., Ltd.) Extruded low density polyethylene of MFR (melt flow rate) 3.8 containing 0.08% (vs. polyethylene) to a thickness of 40 μm, elastic roll and cooling A high-gloss polyethylene resin layer is formed on the surface side of the base paper so that the nip pressure between the rolls is 3.5 MPa (hereinafter, this high-gloss surface is referred to as “front side”). A support (hereinafter referred to as support A) was used.

  In addition, the elastic body which comprises an elastic roll used the thing whose material is ethylene propylene rubber, hardness is 80 by the value represented by JISK-6301, and thickness is 25 mm. Moreover, the roughness of the roll surface of this elastic roll is 0.3S by the value represented by JISB-0601.

-Preparation of coating solution for ink receiving layer-
(A) Vapor phase silica fine particles, (b) ion-exchanged water, (c) Charol DC-902P and (d) ZA-30 in the following composition were mixed and pre-dispersed using a homomixer. Thereafter, dispersion was further performed at 170 MPa in one pass using a liquid-liquid collision type disperser (Ultimizer, manufactured by Sugino Machine Co., Ltd.). This dispersion was heated to 45 ° C. and held for 20 hours. In addition, (e) an aqueous boric acid solution, (f) a polyvinyl alcohol solution, (g) a surfactant, (h) polyoxyethylene lauryl ether, and (i) ethanol in the following composition at 30 ° C. In addition, an ink-receiving layer coating solution was prepared. At this time, the mass ratio of the silica fine particles to the water-soluble resin [PB ratio = (a) / (f)] is 4.5, and the pH of the coating liquid for the ink-receiving layer after preparation is 3.9, which is acidic. Indicated.

<Composition of coating liquid for ink receiving layer>
(A) AEROSIL 300S F75 ... 10.0 parts [manufactured by Nippon Aerosil Co., Ltd .; gas phase method silica fine particles, average primary particle diameter of 7 nm]
(B) Ion-exchanged water ... 64.8 parts (c) Charol DC-902P (51.5% aqueous solution) ... 0.87 parts [Daiichi Kogyo Seiyaku Co., Ltd.]
(D) ZA-30 (Daiichi Rare Element Chemical Co., Ltd.) 0.49 part (e) 5% boric acid aqueous solution 0.40 part (f) Polyvinyl alcohol (water-soluble resin) Solution: 32.0 parts [Composition of solution]
-PVA-235 ... 2.0 parts [manufactured by Kuraray Co., Ltd., saponification degree 88%, polymerization degree 3500]
・ Polyoxyethylene lauryl ether: 0.03 part [Emulgen 109P, manufactured by Kao Corporation]
・ The following compound 1: 0.12 part ・ Diethylene glycol monobutyl ether: 0.55 part [Butizenol 20P, manufactured by Kyowa Hakko Chemical Co., Ltd.]
・ Ion-exchanged water: 26.6 parts (g) Superflex 650: 1.2 parts (Daiichi Kogyo Seiyaku Co., Ltd.)
(H) Polyoxyethylene lauryl ether 0.49 part [Emulgen 109P (10% aqueous solution), HLB value 13.6, manufactured by Kao Corporation]
(I) Ethanol: 2.5 parts

-Production of deodorant inkjet recording sheet-
The front surface of the support obtained above was subjected to a corona discharge treatment, and then the front surface was flowed to 180 ml / m ² in the above-mentioned ink-receiving layer coating solution to a 5-fold diluted aqueous solution of polyaluminum chloride (polyethylene chloride). As aluminum chloride, Alpha-in 83 (Daimei Chemical Co., Ltd.) was applied in-line at a rate of 10.8 ml / m ² . Then, it was dried with a hot air dryer at 80 ° C. (wind speed 3 to 8 m / sec) until the solid content concentration of the coating layer became 20%. At this time, the coating layer showed constant rate drying. Immediately thereafter, this was immersed in a solution A (pH = 7.8) having the following composition for 30 seconds to adhere 15 g / m ² to the surface of the coating layer, and further dried at 80 ° C. for 10 minutes. As described above, a deodorant ink jet recording sheet provided with an ink receiving layer having a dry layer thickness of 33 μm was produced.

<Composition of Solution A>
(A) Boric acid ... 0.65 part (b) Zircozol AC-7 ... 3.0 part [Dilute Elemental Chemical Co., Ltd .; Zirconyl ammonium carbonate]
(C) Ammonium carbonate (first grade: manufactured by Kanto Chemical Co., Inc.) 3.5 parts (d) ion-exchanged water 63.3 parts (e) polyoxyethylene lauryl ether 30.0 Part [Emulgen 109P (2% aqueous solution), HLB value 13.6, manufactured by Kao Corporation]

(Examples 2-4, Comparative Examples 1-2)
A deodorant inkjet recording sheet was prepared in the same manner as in Example 1 except that the pigment, mordant 1 and mordant 2 in the ink receiving layer were changed to those shown in Table 1.

(Comparative Example 3)
In Example 1, as described in Table 1, a deodorant inkjet recording sheet was produced in the same manner as in Example 1 except that the ink receiving layer was not provided.

(Evaluation)
The deodorant inkjet recording sheets obtained in the above Examples and Comparative Examples were evaluated according to the following evaluation methods, and the results are shown in Table 1 below.
did.
(1) Deodorant Evaluation Meat, vegetables, fish, etc. were put into a 6 liter desiccator and left for 2 weeks to create an artificial garbage odor. A sample of 1 g of deodorant inkjet recording sheet was placed in a 1.8 liter wide-mouth bottle.
Subsequently, 10 ml of an artificial garbage odor headspace gas was put into a wide-mouth bottle from a 6 liter desiccator, and the odor intensity over time (after 0 to 6 hours) was sensorially evaluated according to the following criteria.
The evaluation was conducted by 5 expert panelists, and the upper and lower 2 persons were cut off and the average of the 3 persons was rounded off.

<Evaluation criteria>
Evaluation points: Evaluation standard 0: Odorless 1: Very faint odor 2: Slight odor 3: Easily felt odor 4: Strong odor 5: Very strong odor

(2) Glossiness Evaluation Each deodorant inkjet recording sheet of Examples and Comparative Examples is loaded into an inkjet printer (PM-G800, manufactured by Seiko Epson Corporation), and each deodorant inkjet recording sheet is a person, a still life, A landscape image was printed and visually evaluated according to the following evaluation criteria.
〔Evaluation criteria〕
0: Excellent gloss.
1 ... Glossiness was generally good.
2 ... The gloss was poor.

Details of the materials used in the above examples are shown below.
Mizukasil P526: Silica (manufactured by Mizusawa Chemical Co., Ltd.)

  As is apparent from Table 1, the comparative example does not satisfy all of the evaluation items, but the examples having the mordant and the ink receiving layer containing silica on the support having the deodorant composition are all in the evaluation items. It turns out that it is excellent and especially Examples 1-2 are very excellent.

Claims (4)

Ternary composition ratio _SiO 2: 5 to 80 mol%, ZnO: 5 to 65 _{mol%, Al} 2 O 3: a and the amorphous fiber for aluminum-containing composite phyllosilicate and paper 1 to 60 mol% A deodorant inkjet recording sheet in which an ink receiving layer containing a mordant and silica is provided on a support.   The deodorant inkjet recording sheet according to claim 1, wherein the silica is vapor phase silica.   The deodorant inkjet recording sheet according to claim 1 or 2, wherein the mordant is polyaluminum hydroxide.   The deodorant inkjet recording sheet according to any one of claims 1 to 3, wherein the mordant is a polydiallylamine derivative.