JP2005007828A - Inkjet recording sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording sheet, which has enough high ink absorbing speed and, at the same time, is excellent in image preservabilities such as light resistance, gas resistance or water resistance. <P>SOLUTION: In the inkjet recording sheet 1 formed by providing an ink accepting layer 3 on a support 2, the ink accepting layer 3 includes phosphor-containing chelating agent. The favorable chelating agent contains a compound with phosphonic acid group, a compound with both phosphonic acid group and carboxylic acid group and one or at least two compounds selected from these alkali metal salts or amine salts. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００３８】
（＊１）気相法シリカ：ＱＳ３０、トクヤマ社
（＊２）気相法アルミナ：Ａｌ２Ｏ３−Ｃ、日本アエロジル社
（＊３）ホスホノブタントリカルボン酸：水可溶性：ＰＨ４３０、キレスト社
（＊４）アミノトリメチレンホスホン酸：水可溶性：ＰＨ３２０、キレスト社
（＊５）１−ヒドロキシエチリデン−１，１−ジホスホン酸：水可溶性：
ＰＨ２１０、キレスト社
（＊６）ポリビニルアルコール：ＧＨ２０、日本合成化学工業社
（＊７）ポリジアリルアミン重合物：ＰＡＳ−Ｈ−５Ｌ、日東紡社
（＊９）ポリウレタン系樹脂：ＮＳ−３１０Ｘ、高松油脂社
【００３９】
【表２】
インク受容層用塗工液 （単位：重量部）

【００４０】
（＊１）気相法シリカ：ＱＳ３０、トクヤマ社
（＊２）気相法アルミナ：Ａｌ２Ｏ３−Ｃ、日本アエロジル社
（＊６）ポリビニルアルコール：ＧＨ２０、日本合成化学工業社
（＊７）ポリジアリルアミン重合物：ＰＡＳ−Ｈ−５Ｌ、日東紡社
（＊８）エチレンジアミン四酢酸：水不溶性、ｐＨ２．９：３Ａ、キレスト社
エチレンジアミン四酢酸・４Ｎａ塩、ｐＨ１１：水可溶性：Ｄ、キレスト社
（＊９）ポリウレタン系樹脂：ＮＳ−３１０Ｘ、高松油脂社
【００４１】
（２）評価
実施例１〜１２及び比較例１〜８の各インクジェット記録シートについて、インク吸収性、耐光性、耐ガス性及び耐水性を下記基準に従って評価した。これらの結果を表３に示す。
【００４２】
なお、これらの評価において、インクジェット記録シートへの印字には、インクジェットプリンター（ＢＪ−Ｆ６００、キャノン（株））を用いた。
【００４３】
（２−１）インク吸収性
２色のインクを用いてベタ重ね印字を行い、顕微鏡でインクの吸収状態を観察するとともに、印字直後のインクジェット記録シートに紙を荷重５０ｇ／ｃｍ^２ で圧着し、インク転移の状態を観察し、次の基準で評価した。
【００４４】
Ａ：印字境界部が明瞭であり、紙にインクが全く転移していない場合
Ｂ：印字境界が明瞭であるが、僅かに紙にインクが転写した場合
Ｃ：印字境界が不明瞭であるか、紙に多くのインクが転写した場合
Ｄ：印字境界が不明瞭であり、さらに紙に多くのインクがした場合
【００４５】
（２−２）耐光性
インクジェット記録シートに対して、マゼンタインクで１６階調印画を行い、初期濃度がマクベス濃度計で１．０になる部分を選定し、その部分をキセノンフェードメーター（Ｃｉ３５Ａ、アトラス社）を用いて、５５℃、６０％ＲＨ環境中で６２時間照射し、照射後の照射前に対する濃度残存率を求め、次の基準で評価した。
【００４６】
Ａ：濃度残存率が９０％以上
Ｂ：濃度残存率が８０％以上で９０％未満
Ｃ：濃度残存率が７０％以上で８０％未満
Ｄ：濃度残存率が７０％未満
【００４７】
（２−３）耐ガス性
インクジェット記録シートに対して、マゼンタインクで１６階調印画を行い、初期濃度がマクベス濃度計で１．０になる部分を選定し、その部分をオゾンウェザーメーター（ＯＭＳ−Ｌ、スガ試験機社）を用いて、２０℃、５０％ＲＨ，、オゾン濃度０．５ｐｐｍの環境中で２４時間試験し、試験後の試験前に対する濃度残存率を求め、以下の基準で評価した。
【００４８】
Ａ：濃度残存率が９０％以上
Ｂ：濃度残存率が８０％以上で９０％未満
Ｃ：濃度残存率が７０％以上で８０％未満
Ｄ：濃度残存率が７０％未満
【００４９】
（２−４）耐水性
インクジェット記録シートに、イエロー、マゼンタ、シアン及びブラックの各色のベタ印画を行い、次いでこのインクジェット記録シートを純水中に５分間浸漬し、印画物の水への再溶出の状態を観察し、以下の基準で評価した。
【００５０】
Ａ：全く溶出が認められない場合
Ｂ：僅かに、溶出が認められるが実用上問題が無い場合
Ｃ：溶出が認められ、非印画部分に再染着が認められる場合
Ｄ：溶出が著しく、印画部の濃度低下が認められる場合
【００５１】
【表３】

【００５２】
表３の結果から、本発明の実施例１〜１２のインクジェット記録シートは、インク吸収性に優れ、耐光性、耐ガス性及び耐水性といった画像保存性も優れていることがわかる。特に、リンを含有するキレート化剤の添加量を、無機粒子１００重量部に対して１〜１５重量部した実施例１〜４、実施例６〜１１においてはインク吸収性が優れていること、また、無機粒子としてシリカを用いた実施例１〜７、実施例９〜１１においては、耐水性が優れていることがわかる。
【００５３】
これに対し、リンを含有するキレート化剤がインク受容層に含まれない比較例１〜８においては、耐光性、耐ガス性及び耐水性が劣り、また、キレート剤としてエチレンジアミン四酢酸又はその塩を用いた比較例３〜７においても耐光性、耐ガス性及び耐水性が劣り、さらにこれらはインク受容層がひび割れしやすいことがわかる。
【００５４】
【発明の効果】
本発明によれば、インクの吸収速度が十分に高く、かつ、耐光性、耐ガス性、耐水性などの画像保存性にも優れたインクジェット記録シートが提供される。
【図面の簡単な説明】
【図１】インクジェット記録シートの断面図である。
【符号の説明】
１…インクジェット記録シート、 ２…支持体、 ３…インク受容層、[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inkjet recording sheet.
[0002]
[Prior art]
As one of the methods for outputting image information and character code information produced by a personal computer to a recording medium such as paper, recording using water-soluble dyes or pigments as a drive source using electric field, heat, pressure, etc. There is an ink jet recording method in which an image is formed by being ejected from a nozzle onto a recording medium.
[0003]
The inkjet recording system has advantages such as low running costs, low noise, easy multi-coloring, and the ability to form images on plain paper. is doing.
[0004]
In addition to plain paper, the recording medium on which an image is formed by the inkjet recording method is coated paper having an ink receiving layer on the recording surface side, glossy paper having a glossy recording surface, and ink reception on a transparent substrate. An ink jet recording sheet such as an OHP recording sheet having a layer is used.
[0005]
The characteristics required for the ink jet recording sheet are that the ink absorption speed is fast, the ink does not flow out or bleed even when the print dots overlap, the density of the print dots is high, the color tone is bright and vivid, The spreading of the printed dots in the lateral direction is not larger than necessary, and the periphery is smooth and unblurred. In particular, regarding the ink absorption rate, if the ink absorption rate is slow, the ink droplets mix with other droplets before being absorbed by the surface layer of the inkjet recording sheet, causing uneven printing such as repellency and bleeding. The image quality may be greatly reduced. Therefore, the ink jet recording sheet is required to have high ink absorbability.
[0006]
In order to satisfy these required characteristics, conventionally, a method has been proposed in which an ink jet recording sheet is provided with a porous layer having voids using inorganic particles such as alumina and silica and a binder resin to increase the ink absorbability. Yes. Furthermore, when forming such a porous layer on an ink jet recording sheet, the porous layer is made into a three-dimensional network structure using silica having a specific particle diameter and a water-soluble resin (Patent Document 1), It has also been proposed to add a chain polycarboxylic acid to the layer to prevent discoloration during image storage (Patent Document 2).
[0007]
On the other hand, in order to improve the color developability of the ink jet recording sheet, it has been proposed that the surface coating layer contains a chelating agent such as ethylenediaminetetraacetic acid (Patent Document 3).
[0008]
[Patent Document 1] Japanese Patent Laid-Open No. 7-276789 [Patent Document 2] Japanese Patent No. 3236118 [Patent Document 3] Japanese Patent Laid-Open No. 9-314985
[Problems to be solved by the invention]
By the way, in recent years, as an alternative to silver halide photography, it has become widespread to output image data recorded by a digital camera or the like using an ink jet recording system. Therefore, the image recorded on the ink jet recording sheet is often stored for a long period of time, and the image formed on the ink jet recording sheet is kept clear for a long period of time, that is, excellent in image storability. Has come to be desired. More specifically, even when exposed to light for a long period of time, the printed image is highly resistant to fading and discoloration, and even if exposed to a small amount of ozone or oxidizing gas contained in the air for a long period of time, the printed image Therefore, there is a demand for a high gas resistance that is less likely to cause fading or discoloration, and a high water resistance that prevents the printed image from bleeding or fading even if the printed image is accidentally exposed to water.
[0010]
However, conventionally, an ink jet recording sheet having a sufficiently high ink absorption rate and excellent image storage stability has not been obtained.
[0011]
Accordingly, an object of the present invention is to provide an ink jet recording sheet having a sufficiently high ink absorption rate and excellent image storability such as light resistance, gas resistance and water resistance.
[0012]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides an inkjet recording sheet in which an ink receiving layer is provided on a support, wherein the ink receiving layer contains a chelating agent containing phosphorus. A sheet is provided, and in particular, the ink receiving layer is provided with an inorganic particle and a porous layer containing 10 to 40% by weight of a hydrophilic resin with respect to the inorganic particle.
[0013]
In this ink jet recording sheet, since the ink receiving layer contains a chelating agent containing phosphorus, image storability is improved. Although the mechanism by which the image storage stability is improved by adding a chelating agent to the ink receiving layer is not clear, unstable ions generated by decomposition of the dye during image storage are blocked by the chelating agent, and the dye is It is considered that the discoloration or discoloration of the stored image is suppressed because the chain reaction that decomposes is suppressed.
[0014]
Further, in this ink jet recording sheet, the ink absorption speed was improved in the aspect in which the inorganic layer and the porous layer containing 10 to 40% by weight of the hydrophilic resin with respect to the inorganic particle were provided as the ink receiving layer. It will be a thing.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
[0016]
FIG. 1 is a cross-sectional view of an ink jet recording sheet 1 according to an embodiment of the present invention. The ink jet recording sheet 1 includes a support 2 and an ink receiving layer 3 provided on the support 2.
[0017]
The ink receiving layer 3 is a layer on which an image is formed by performing ink jet recording, and is a porous layer composed of inorganic particles, a chelating agent containing phosphorus, a resin, and auxiliaries.
[0018]
Here, as the inorganic particles, various particles conventionally used for forming a porous layer of an ink jet recording sheet can be used. For example, light calcium carbonate, heavy calcium carbonate, magnesium silicate, silicic acid Aluminum, colloidal silica, colloidal alumina, barium sulfate, calcium sulfate, satin white, clay, synthetic amorphous silica, alumina, titanium dioxide, kaolin, magnesium hydroxide, pseudoboehmite, magnesium carbonate, zinc oxide, mica, zinc sulfide, etc. Can be mentioned. These may be used alone or in combination of a plurality of types for forming the ink receiving layer 3.
[0019]
Among these, as the inorganic particles, porous synthetic amorphous silica or porous alumina having a large pore volume is preferable. In particular, the silica fine particles synthesized by the gas phase method can be relatively easily converted to the primary particles. This is preferable because an ink receiving layer having a high porosity can be obtained.
[0020]
On the other hand, a chelating agent containing phosphorus refers to a compound containing phosphorus in the molecule and capable of forming chelate complexes with various metal ions. The chelating agent is preferably a compound having a phosphonic acid group, a compound having a phosphonic acid group and a carboxylic acid group, or an alkali metal salt or amine salt thereof. Moreover, as a chelating agent containing phosphorus, the thing (pH of the saturated aqueous solution of the said chelating agent) of 7 or less is preferable from a gas-resistant point. Specific examples of particularly preferable chelating agents include, for example, 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) (pH 1.6), phosphonobutane tricarboxylic acid (PBTC) (pH 1.6) having a pH of 2 or less. ), Aminotrimethylenephosphonic acid (NTMP) (pH 1.5), etc. In addition, K salt (pH 4.5) of phosphonobutanetricarboxylic acid, aminopolyphosphonic acid (APP), etc. are also used. be able to. These can be used as one kind or a mixture of two or more kinds.
[0021]
In the present invention, as the chelating agent containing phosphorus, one that can be dissolved in water at room temperature is used. Use of a water-insoluble chelating agent is not preferable because the glossiness of the ink jet recording sheet becomes insufficient and the coating strength of the ink receiving layer is also inferior.
[0022]
The addition amount of the chelating agent having phosphorus is 1 to 15 parts by weight, preferably 2.5 to 10 parts by weight with respect to 100 parts by weight of the inorganic particles contained in the ink receiving layer 3 described above. If the amount of the chelating agent added is too small, the effect of improving the image storability is insufficient. On the other hand, if the amount is too large, the ink absorptivity is insufficient and the printing density is lowered.
[0023]
In the formation of the ink receiving layer 3, the resin is used for forming a coating film. Examples of this resin include polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl acetal, cellulose derivatives such as carboxymethyl cellulose and methyl cellulose, various starches such as starch and oxidized starch, proteins such as casein and soybean protein, acrylic resins, melamine resins, Known resins generally used for coated paper, such as acrylic polymer latex, styrene-butadiene copolymer, ethylene-vinyl acetate copolymer, polyurethane resin, can be used alone or in combination, A hydrophilic resin is particularly preferable. Among these, polyvinyl alcohol is preferable from the viewpoint of improving the coating strength.
[0024]
A preferable addition amount of the resin in the ink receiving layer 3 is 10 to 40 parts by weight, more preferably 15 to 30 parts by weight with respect to 100 parts by weight of the inorganic particles. If the addition amount is less than 10 parts by weight, the coating film strength is reduced and cracking is likely to occur, and even if the above-mentioned chelating agent is added, the effect of improving the image preservability may not be obtained. . On the other hand, if it exceeds 40 parts by weight, it is not preferred because the ink absorptivity decreases and the image is blurred.
[0025]
Auxiliaries are added to the ink receiving layer 3 as necessary. As auxiliary agents, for example, ink fixing agents, pigment dispersants, thickeners, singlet oxygen quenchers, hindered amine light stabilizers, antioxidants, antifoaming agents, ultraviolet absorbers, fluorescent whitening agents, Water-resistant agents, anti-fading agents, antistatic agents, anti-mold agents and the like can be mentioned.
[0026]
In particular, it is preferable to add an ink fixing agent in order to improve the water resistance of the printed image and prevent bleeding of the printed image. As the ink fixing agent, since the ink-jet ink dye is usually anionic, it is preferable to add a cationic inorganic or organic substance to insolubilize the dye, and it is more preferable to add a cationic organic substance. Examples of such cationic organic substances include polyethyleneimine, polyethyleneamine, polypropylene polyamine, polyvinylamine, polyamine sulfone, polyamine polyamide epichlorohydrin, dimethyldiallylammonium chloride polymer, dimethyldiallylammonium chloride polymer-SO2 copolymer, diallylamine. Examples thereof include a salt-SO2 copolymer, a dicyandiamide-diethylenetriamine polycondensate, and a dicyandiamide-formalin polycondensate.
[0027]
The ink receiving layer 3 is prepared by dissolving or dispersing the above-described inorganic particles, phosphorus-containing chelating agent, resin, and auxiliaries in water or an appropriate solvent, and preparing the coating liquid by, for example, Formed by applying onto the support 2 and drying using a roll coating method, blade coating method, air knife coating method, rod bar coating method, gravure coating method, comma coating method, die coating method or the like as appropriate. can do.
[0028]
The coating amount of the ink receiving layer 3 can be appropriately determined, but is usually preferably about 10 to 40 g / m ² , more preferably about 15 to 30 g / m ² .
[0029]
On the other hand, as the support 2 which is the base of the ink receiving layer 3, for example, a paper support made of a pulp raw material mainly composed of natural cellulose fibers, polyester (eg, polyethylene terephthalate), cellulose triacetate, polycarbonate, polychlorinated A plastic support made of a material such as vinyl, polypropylene, or polyimide, or a resin-coated paper (eg, RC paper) having a polyolefin resin coating layer in which a white pigment or the like is added to at least one of the base papers can be used.
[0030]
In order to obtain a clear image at a higher density, it is preferable to use a hydrophobic material that does not allow ink liquid to penetrate into the support 2. Specifically, a plastic support or a resin coating is used. It is preferable to use paper or the like.
[0031]
The basis weight of the support 2 can be determined as appropriate, but in general, it is preferably about 75 to 350 g / m ² , more preferably about 100 to 300 g / m ² .
[0032]
In addition, the present invention can take various forms as long as the ink receiving layer 3 contains a chelating agent containing phosphorus. For example, in order to improve the adhesion between the ink receiving layer 3 and the support 2, a known anchor agent may be applied to the support 2 as necessary, and the support 2 can be easily made by a plasma discharge method or the like. It may be bonded.
[0033]
In addition, when a transparent substrate is used like an OHP sheet and the ink receiving layer requires high transparency, or when ink jet recording sheets require high glossiness, the ink receiving layer contains inorganic particles. You don't have to. When inorganic particles are not contained, the addition amount of the chelating agent having phosphorus is 1 to 15 parts by weight, preferably 2.5 to 10 parts by weight with respect to 100 parts by weight of the resin contained in the ink receiving layer. If the amount of the chelating agent added is too small, the effect of improving the image preservability is insufficient. On the other hand, if the amount is too large, the coating film becomes opaque or the print density is lowered.
[0034]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. In the following examples, “%” means “% by weight (in terms of solid content)” unless otherwise specified.
[0035]
Examples 1-12 and Comparative Examples 1-8
(1) Preparation of inkjet recording sheet The ink receiving layer coating liquid shown in Tables 1 and 2 was prepared to a solid content concentration of 20% using a solvent of water / isopropyl alcohol = 90/10. the coating amount of 25 g / ^{m 2} (solid basis) was coated using a bar coater on a resin-coated paper having a basis weight of 170g / ^{m 2} (RC paper), then dried for 5 minutes at 90 ° C. with inkjet A recording sheet was prepared.
[0036]
However, in the production of the ink jet recording sheets of Example 12 and Comparative Example 8, instead of polyvinyl alcohol, a polyurethane resin (NS-310X, Takamatsu Yushi Co., Ltd.) was used as the resin, and the coating liquid was 10 g / m. A coating amount of ² (in terms of solid content) was applied onto a white polyester film having a thickness of 100 μm using a bar coater, and then dried at 110 ° C. for 5 minutes to prepare an ink jet recording sheet.
[0037]
[Table 1]
Ink-receiving layer coating solution (Unit: parts by weight)

[0038]
(* 1) Gas phase method silica: QS30, Tokuyama Corporation (* 2) Gas phase method alumina: Al2O3-C, Nippon Aerosil Co., Ltd. (* 3) Phosphonobutane tricarboxylic acid: Water solubility: PH430, Cylest (* 4) Aminotrimethylene phosphonic acid: water-soluble: PH320, Kirest (* 5) 1-hydroxyethylidene-1,1-diphosphonic acid: water-soluble:
PH210, Kirest (* 6) Polyvinyl alcohol: GH20, Nippon Synthetic Chemical Industry (* 7) Polydiallylamine polymer: PAS-H-5L, Nittobo (* 9) Polyurethane resin: NS-310X, Takamatsu Oil Company [0039]
[Table 2]
Ink-receiving layer coating solution (Unit: parts by weight)

[0040]
(* 1) Vapor phase silica: QS30, Tokuyama (* 2) Vapor phase alumina: Al2O3-C, Nippon Aerosil (* 6) Polyvinyl alcohol: GH20, Nippon Synthetic Chemical Industry (* 7) Polydiallylamine polymerization Material: PAS-H-5L, Nittobo Co., Ltd. (* 8) Ethylenediaminetetraacetic acid: water-insoluble, pH 2.9: 3A, ethylene oxide tetraacetic acid, 4Na salt, Kirest Co., Ltd., pH 11: water-soluble: D, Kirest Corporation (* 9) Polyurethane resin: NS-310X, Takamatsu Yushi Co., Ltd.
(2) Evaluation Each ink jet recording sheet of Examples 1 to 12 and Comparative Examples 1 to 8 was evaluated for ink absorptivity, light resistance, gas resistance and water resistance according to the following criteria. These results are shown in Table 3.
[0042]
In these evaluations, an ink jet printer (BJ-F600, Canon Inc.) was used for printing on the ink jet recording sheet.
[0043]
(2-1) Ink absorbability Solid overprinting is performed using two colors of ink, the ink absorption state is observed with a microscope, and the paper is pressure-bonded to the ink jet recording sheet immediately after printing with a load of 50 g / cm ² . The state of ink transfer was observed and evaluated according to the following criteria.
[0044]
A: The print boundary is clear and the ink has not transferred to the paper at all. B: The print boundary is clear, but the ink is slightly transferred to the paper. C: The print boundary is unclear. When a large amount of ink is transferred onto the paper D: When the printing boundary is unclear, and when a large amount of ink is further printed on the paper
(2-2) A 16-tone printing with magenta ink was performed on a light-resistant ink jet recording sheet, a portion where the initial density was 1.0 with a Macbeth densitometer was selected, and that portion was selected as a xenon fade meter (Ci35A, Atlas Co., Ltd. was used for irradiation for 62 hours in an environment of 55 ° C. and 60% RH, and the concentration residual ratio after irradiation was measured and evaluated according to the following criteria.
[0046]
A: Concentration residual ratio is 90% or more B: Concentration residual ratio is 80% or more and less than 90% C: Concentration residual ratio is 70% or more and less than 80% D: Concentration residual ratio is less than 70%
(2-3) A 16-tone printing with magenta ink is performed on a gas-resistant ink jet recording sheet, and a portion where the initial density is 1.0 with a Macbeth densitometer is selected. -L, Suga Test Instruments Co., Ltd.) in an environment of 20 ° C., 50% RH, and ozone concentration of 0.5 ppm for 24 hours. evaluated.
[0048]
A: Concentration residual ratio is 90% or more B: Concentration residual ratio is 80% or more and less than 90% C: Concentration residual ratio is 70% or more and less than 80% D: Concentration residual ratio is less than 70%
(2-4) Solid printing of each color of yellow, magenta, cyan and black was performed on a water-resistant ink jet recording sheet, and then this ink jet recording sheet was immersed in pure water for 5 minutes to re-elute the printed matter into water. Were observed and evaluated according to the following criteria.
[0050]
A: When elution is not observed at all B: Slight elution is observed but there is no problem in practical use C: Elution is observed and re-dyeing is observed in the non-printed portion D: Elution is remarkable and printing When a decrease in the concentration is observed [0051]
[Table 3]

[0052]
From the results of Table 3, it can be seen that the ink jet recording sheets of Examples 1 to 12 of the present invention are excellent in ink absorbability and excellent in image storability such as light resistance, gas resistance and water resistance. In particular, in Examples 1 to 4 and Examples 6 to 11 in which the addition amount of the chelating agent containing phosphorus is 1 to 15 parts by weight with respect to 100 parts by weight of the inorganic particles, the ink absorbency is excellent. Moreover, in Examples 1-7 and Examples 9-11 which used the silica as an inorganic particle, it turns out that water resistance is excellent.
[0053]
On the other hand, in Comparative Examples 1 to 8 in which a chelating agent containing phosphorus is not included in the ink receiving layer, light resistance, gas resistance and water resistance are inferior, and ethylenediaminetetraacetic acid or a salt thereof as a chelating agent It can be seen that Comparative Examples 3 to 7 using the ink are inferior in light resistance, gas resistance and water resistance, and further, the ink receiving layer tends to crack.
[0054]
【The invention's effect】
According to the present invention, there is provided an ink jet recording sheet having a sufficiently high ink absorption rate and excellent image storability such as light resistance, gas resistance and water resistance.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an inkjet recording sheet.
[Explanation of symbols]
1 ... inkjet recording sheet, 2 ... support, 3 ... ink receiving layer,

Claims (6)

An ink jet recording sheet having an ink receiving layer provided on a support, wherein the ink receiving layer contains a chelating agent containing phosphorus. 2. The ink jet recording according to claim 1, wherein the chelating agent comprises one or more compounds selected from a compound having a phosphonic acid group, a compound having a phosphonic acid group and a carboxylic acid group, and alkali metal salts or amine salts thereof. Sheet. The inkjet recording sheet according to claim 1, wherein the chelating agent has a pH of 7 or less. The ink jet recording sheet according to claim 1, wherein the ink receiving layer comprises an inorganic particle and a porous layer containing 10 to 40% by weight of a hydrophilic resin based on the inorganic particle. The ink jet recording sheet according to claim 4, wherein the inorganic particles are made of porous silica. The ink jet recording sheet according to claim 1, wherein the ink receiving layer contains a cationic ink fixing agent.

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