JP3918682B2 - Inkjet recording sheet - Google Patents

Description

【００６１】
【発明の効果】
表１から明らかなように、本発明のインクジェット記録用シートは、オゾンガスに暴露された場合でも画像の変褪色が非常に少なく、長期保存性に優れた記録用シートであった。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink jet recording sheet used for ink jet printing, and in particular, while maintaining the characteristics of high print density of an image printed in full color on an ink jet recording sheet and excellent ink absorbency, The present invention relates to an ink jet recording sheet having no discoloration in long-term storage, which was a drawback of the ink jet recording sheet.
[0002]
[Prior art]
The ink jet recording method that forms an image by ejecting liquid ink from a fine nozzle onto a recording body has low noise during recording, easy colorization, high-speed recording, and other printing It is widely used in terminal printers, facsimiles, plotters, form printing, and the like because it is less expensive than the apparatus.
On the other hand, with the rapid spread of printers, high definition and high speed, and the advent of digital cameras, advanced characteristics have also been demanded on the recording medium side. That is, there is a strong demand for the realization of a recording material that has excellent absorbability, recording density, water resistance, and storage stability, and has image quality and storage stability comparable to silver salt photography.
[0003]
In order to meet such demands, many proposals have been made on a sheet in which an ink receiving layer mainly composed of a pigment and an adhesive is provided on a support. For example, a coating layer comprising amorphous silica and a polymer binder (Japanese Patent Laid-Open Nos. 55-51583, 57-157786, 62-158084), a coating layer having an ink adsorbing pigment such as zeolite ( JP-A-56-144172), coating layer composed of finely divided silicic acid and a water-soluble resin (JP-A-56-148583), coating layer having porous cationic alumina hydrate (JP-A-60) No. 232990) and the like are proposed on a support.
[0004]
From the viewpoint of improving the water resistance of printing, cationic polymers (Japanese Patent Laid-Open Nos. 56-84992, 60-49990, 61-125878) and basic latex (Japanese Patent Laid-Open No. 57-36692) are also disclosed. (Patent Publications) and the like have been proposed.
[0005]
Further, from the viewpoint of improving the storability of printing, a method of adding at least one of metal oxides such as phosphotungstic acid, phosphomolybdic acid, and chromic chloride, metal chloride, and tannic acid (JP-A-57). -87987), a method of adding an antioxidant such as hindered phenols (Japanese Patent Laid-Open No. 57-74192), a method of adding hindered amines (Japanese Patent Laid-Open No. 61-14659), a benzophenone series, A method of adding an ultraviolet absorber such as a benzotriazole type or a phenyl salicylic acid type (Japanese Patent Laid-Open Nos. 57-74193, 57-87988, 63-222858), a method of adding a thiourea compound ( JP, 61-163886, 2-mercaptobenzothiazole, 2-mercaptobenzimidazole, etc. And a method of adding dithiocarbamate, thiuram salt, thiocyanate or thiocyanate (JP-A-7-314882) and the like have been proposed. Yes.
[0006]
However, full-color inkjet recording images formed using these techniques are still insufficient for discoloration during long-term storage, particularly when magenta dyes are used.
[0007]
There is an invention described that albumin is used for the ink receiving layer (for example, JP-A-3-155882). However, it is only an example as a kind of water-soluble adhesive, and apart from the water-soluble adhesive, there is no technical idea to be used as a dye preservability improving agent, and suggests the effect of being excellent in preservability. not.
[0008]
In addition, there is an invention (JP-A-5-85033) that states that proteins can be used when a xenogel-based porous pigment is used as a coating material for an ink-jet receiving layer. The purpose is different and the effect is also different, and ovalbumin, egg yolk, lipoprotein, etc. are not specified.
[0009]
[Problems to be solved by the invention]
The object of the present invention is to change the color of a long-term storage, which is a disadvantage of the conventional inkjet recording sheet, especially when a magenta dye is used, when the ink is printed in full color on the inkjet recording sheet. The present invention is to provide an ink jet recording sheet which can significantly reduce the ink quality and has no problem with other print quality and strength.
[0010]
[Means for Solving the Problems]
The present invention includes the following embodiments.
(1) In an inkjet recording sheet in which at least one ink receiving layer is provided on a support, either between the ink receiving layer and the support, in the ink receiving layer, or on the ink receiving layerAnd at least one selected from ovalbumin, egg yolk, and lipoprotein as a preservative improverAn ink jet recording sheet comprising:
[0011]
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to an ink jet recording sheet having at least one ink receiving layer provided on a support, and a storage stability improving agent between the ink receiving layer and the support, in the ink receiving layer, and on the ink receiving layer. AsAt least one selected from ovalbumin, egg yolk, and lipoproteinAn ink-jet recording sheet comprising the ink-jet recording sheet. Above all, in the ink receiving layer and / or on the ink receiving layerSaidAn ink jet recording sheet containing a protein as a preservability improving agent is preferable because discoloration during long-term storage is extremely small. When contained in the ink receiving layer, a protein may be blended as a preservability improver in a known ink receiving layer as an ink jet recording sheet. For example, an ink receiving layer using at least a pigment, a water-soluble adhesive, and a protein is used. It is preferable because it is excellent in ink jet recording suitability.
[0013]
Used in the present inventionAs a shelf life improverIsOvalbumin, egg yolk, lipoproteinHas an effectInExcellent, especially egg yolk and lipoprotein have a remarkable effect.
[0014]
In the present invention, the mechanism by which such a protein functions as a storage stability improving agent is not clear. In general, the cause of discoloration of a full-color inkjet recording image during long-term storage is considered to be because the dye used is easily oxidized by a gas in the air, particularly a gas having a strong oxidizing power such as ozone. . In the present invention, the protein probably has a structure showing hydrophobicity inside and hydrophilicity outside, and the hydrophobic part of the dye enters the hydrophobic part inside the protein having the affinity to protect the dye. It is presumed that, when ozone is approached, protein is oxidized prior to the dye and inhibits the oxidation reaction of the dye.
[0015]
The support for the ink jet recording sheet used in the present invention is not particularly limited as long as it can be used as a normal ink jet recording sheet. Paper (acidic paper, neutral paper), synthetic paper, plastic A film, non-woven fabric, or the like, or a plastic film laminated with coated paper or high-quality paper via an adhesive, or a paper laminated with plastic is used. Examples of such a plastic film include films of polyester, polypropylene, nylon, and the like.
[0016]
In addition, an undercoat layer or a back surface coating layer for the purpose of preventing curling, imparting barrier properties, improving adhesion, preventing static charge, adjusting color tone, etc. between the support and the ink receiving layer or on the surface of the support where the ink receiving layer is not formed. May be formed. Proteins can also be included in this layer.
[0017]
As the ink receiving layer of the ink jet recording sheet, a known ink receiving layer can be used. For example, the ink receiving layer is a layer having a pigment and an adhesive and, if necessary, a cationic polymer.
[0018]
Examples of pigments to be included in the ink receiving layer include zeolite, light calcium carbonate, heavy calcium carbonate, magnesium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium oxide, zinc oxide, zinc sulfide, zinc carbonate, and satin white. , Aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, silica, aluminum hydroxide, alumina, alumina hydrate, aluminosilicate, boehmite, pseudoboehmite, lithopone, urea-formalin resin filler and the like. These are used individually or in mixture of 2 or more types.
Among these, silica, alumina, and alumina hydrate are preferable because of excellent ink absorbability.
[0019]
Furthermore, it is preferable to use silica having an average primary particle size of 30 nm or less and a specific surface area of 200 m 2 / g or more by the BET method because a high-quality image can be obtained. The lower limit of the primary particles is not particularly limited, but is preferably 1 nm or more, and the upper limit of the specific surface area is not particularly limited, but is 500 m.²/ G or less is preferable.
[0020]
The amount of the pigment used in the ink receiving layer is about 20 to 90% by weight, preferably about 30 to 80% by weight, based on the solid content of the ink receiving layer. If the content exceeds 90% by mass, the coating strength of the ink receiving layer decreases, and if it is less than 20% by mass, the ink absorbability decreases, and the ink drying property after recording may be insufficient and the image quality may deteriorate. is there.
[0021]
In the present invention, as the cationic polymer, it is possible to use a polymer that dissociates and exhibits cationic properties when dissolved or emulsified in water. Examples of such cationic polymers include polydiallyldimethylammonium chloride, diallyldimethylammonium chloride / acrylamide copolymer, diallyldimethylammonium chloride / sulfur dioxide copolymer, polyallylamine hydrochloride, and N-vinylacrylamidine hydrochloride. Acrylamide copolymer, dialkylamine / epichlorohydrin addition polymer, polyamide polyamine epichlorohydrin polymer, dicyandiamide / formalin polycondensate, polyalkylenepolyamine / dicyandiamide polycondensate, polyethyleneimine hydrochloride, poly (meta ) Acryloyloxyalkyldialkylamine hydrochloride, (meth) acryloyloxyalkyldialkylamine hydrochloride / acrylamide copolymer, poly (meth) a Liloyloxyalkyltrialkylammonium chloride, (meth) acryloyloxyalkyltrialkylammonium chloride / acrylamide copolymer, poly (meth) acrylamide alkyldialkylamine hydrochloride, (meth) acrylamide alkyldialkylamine hydrochloride / acrylamide copolymer , Poly (meth) acrylamide alkyltrialkylammonium chloride, (meth) acrylamide alkyltrialkylammonium chloride / acrylamide copolymer, and the like.
[0022]
For the ink receiving layer, for example, starch derivatives such as oxidized starch and etherified starch, cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, casein, gelatin, fully (partially) saponified polyvinyl alcohol, silicon-modified polyvinyl alcohol, Water-dispersible adhesives such as water-soluble adhesives such as acetoacetyl-modified polyvinyl alcohol, styrene-maleic anhydride copolymer salts, styrene-butadiene latex, acrylic latex, polyester polyurethane latex, vinyl acetate latex, etc. Or organic solvent soluble resins such as polymethyl methacrylate, polyurethane resin, unsaturated polyester resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, alkyd resin, etc. Mixed and used in.
These adhesives are generally used in an amount of about 1 to 200 parts by weight, preferably about 10 to 100 parts by weight, with respect to 100 parts by weight of the pigment.
[0023]
In particular, a structure having a pigment, a water-soluble adhesive, and a protein as the ink receiving layer is preferable because it is excellent in ink jet recording suitability, and further, a water-insoluble polymer is preferable because the strength of the ink receiving layer is excellent.
Examples of the water-insoluble polymer include conjugated diene polymers such as styrene-butadiene copolymer and methyl methacrylate-butadiene copolymer, and acrylic polymers such as acrylate ester and methacrylate ester polymers or copolymers. Water-dispersible polymer adhesives such as vinyl polymers such as ethylene-vinyl acetate copolymers, or modified polymers containing functional groups such as carboxyl groups and cationic groups of these various polymers, melamine resins, urea Synthetic resin-based aqueous adhesives such as thermosetting resins such as resins, maleic anhydride copolymer resin systems, polyacrylamide systems, polymethyl methacrylate systems, polyurethane resin systems, unsaturated polyester resin systems, polyvinyl butyral systems, alkyd resin systems And polymers such as synthetic resin adhesives such as acrylic polymers and ethylene- Acid vinyl copolymer has good adhesion, and therefore improves the affinity good absorbent to the ink, preferably used.
[0024]
When the protein is contained in the ink receiving layer, it may be blended in the range of 1 to 20% by mass with respect to the total solid content of the ink receiving layer. When the amount is less than 1% by mass, the effect of improving the storage stability cannot be obtained sufficiently. When the amount exceeds 20% by mass, the strength of the ink receiving layer tends to be lowered.
[0025]
In addition, in the ink receiving layer, pigment dispersants, thickeners, crosslinking agents, fluidity modifiers, antifoaming agents, foam inhibitors, mold release agents, foaming agents, penetrating agents, colored dyes, colored pigments, fluorescent Brightening agents, preservatives, antifungal agents, water-proofing agents, and the like can be added as appropriate.
[0026]
For the ink receiving layer, the ink receiving layer coating liquid is applied after drying on at least one side of the support by a coating method such as a bar coater, blade coater, air knife coater, gravure coater, die coater, curtain coater, slide bead coater, etc. Amount 2-30g / m²It is formed by coating and drying to a degree. Incidentally, the coating amount is 2 g / m.²If it is less, the recording image quality is lowered and 30 g / m.²If it is more, the coating strength may be lowered. A plurality of ink receiving layers can also be formed. In addition, the ink receiving layer can be formed on both sides of the support.
[0027]
For the purpose of imparting high gloss after the ink receiving layer is formed, it is also possible to impart surface smoothness through a roll nip under pressure with, for example, a super calender or gloss calender.
[0028]
A gloss layer can be further provided on the ink receiving layer described above. This gloss layer can contain resin as a main component. Moreover, it can also be comprised by containing a pigment and resin. The gloss layer is preferably made porous or liquid-permeable so long as it does not impair the gloss so that the ink can be passed or absorbed quickly. In order to do this, it is preferable to select a drying condition that does not completely form the resin within a range where the pigment is blended or the gloss is not lowered. Protein can be mix | blended with such a glossy layer as a preservative improvement agent.
[0029]
Examples of the pigment used in the gloss layer include the same pigments as those used in the ink receiving layer, but colloidal silica, amorphous silica, aluminum oxide, aluminosilicate, zeolite in terms of gloss, transparency and ink absorption. Synthetic smectite is preferable. These pigments are preferably contained in the gloss layer in an amount of 10 to 80% by mass. The larger the BET specific surface area of the pigment, the better the ink absorbency.²/ G or more is preferable. There is no upper limit, but 1000m²Up to about 700g / g²/ G or less is preferable. The average particle diameter of the pigment (in the case of aggregated particles, the diameter of the aggregated particles) is preferably 0.01 to 5 μm, and more preferably 0.05 to 1 μm. More preferably, it is 0.05-0.8 micrometer. If the particle diameter is less than 0.01 μm, the effect of improving ink absorbability may be poor, and if it exceeds 5 μm, gloss and print density may be reduced. When fine silica particles having an average primary particle size of 3 nm to 40 nm and an average secondary particle size of 10 nm to 500 nm are used as the pigment, the gloss and ink absorbability are particularly excellent. When the glossy layer is formed with a pigment as a main component (10 to 80%), the ink absorbability is particularly preferable.
[0030]
In this case, since the gloss layer is excellent in ink absorption and transparency, when a cationic compound is blended in the gloss layer, the ink dye is efficiently fixed on the gloss layer, and the print density is extremely excellent in combination with the transparency of the gloss layer. It is easy to become a thing. Examples of the gloss layer resin include water-soluble resins (eg, polyvinyl alcohols such as polyvinyl alcohol, cation-modified polyvinyl alcohol and silyl-modified polyvinyl alcohol, casein, starch, cellulose derivatives such as carboxymethyl cellulose and methyl cellulose), styrene-butadiene copolymer Water-dispersible resins such as polymers, conjugated diene polymer latexes such as methyl methacrylate-butadiene copolymer, vinyl copolymer latexes such as styrene-vinyl acetate copolymer, water-based acrylic resins, water-based polyurethane resins, water-based polyesters Various resins (adhesives) commonly used in the field of coated paper, such as resins, are used alone or in combination.
[0031]
In the case of forming a gloss layer mainly composed of a resin, a polymer or copolymer (hereinafter collectively referred to as a polymer) obtained by polymerizing a monomer having an ethylenically unsaturated bond (hereinafter referred to as an ethylenic monomer). It is preferable that the main component is configured as a main component. Furthermore, substituted derivatives of these polymers may be used. In addition, the above ethylenic monomer is polymerized in the presence of colloidal silica to form a composite by Si—O—R (R: polymer component) bond, or colloidal silica such as SiOH group is added to the polymer. A functional group capable of reacting may be introduced and used in the form of a composite by reacting with colloidal silica. When this composite is used, it tends to be excellent in gloss and ink absorbability.
[0032]
Further, in an embodiment in which a gloss layer is obtained by a cast method using a heated mirror drum, the resin such as the polymer preferably has a glass transition point of 40 ° C. or higher, more preferably in the range of 50 to 100 ° C. . When the glass transition point is low, film formation proceeds too much during drying, and as a result, the porosity of the surface is lowered, and as a result, the ink absorption rate may be lowered. In addition, the drying temperature is important. If the drying temperature is too high, film formation proceeds too much, resulting in a decrease in surface porosity, resulting in a decrease in ink absorption rate. Conversely, if the drying temperature is too low, the gloss is poor. The productivity also decreases. A cast method can also be used for the glossy layer. In this aspect, it tends to be excellent in releasability from the cast drum. The composite particles are not particularly limited, but for example, the average particle size is about 20 to 200 nm.
[0033]
In the wet method, while the glossy layer coated on the base paper is in a wet state, the glossy expression layer is pressed against the heated mirror drum surface to perform a high gloss finish. In the gelation method, while the glossy layer coated on the base paper is in a wet state, the glossy layer is brought into contact with a gelling agent bath, and the gelled glossy layer is pressed against the heated drum surface to obtain a high gloss finish. Is to do. In the rewetting method, a glossy layer in a wet state is once dried and then brought into contact with a wetting liquid again, and then pressed against the surface of a heated drum to perform a high gloss finish.
[0034]
The coating amount of the gloss layer is 0.2 to 30 g / m in dry solid content.², Preferably 1-20 g / m²It is. Here, 0.2 g / m²If it is less than 30%, the gloss may not be sufficient. 30g / m²If it exceeds the upper limit, the ink drying property may be deteriorated or the recording density may be lowered.
[0035]
The ink jet recording sheet of the present invention is known as a so-called adhesive process in which a pressure-sensitive adhesive layer and a release sheet are laminated on the back surface, so-called magnetic processing in which a magnetic recording layer is formed on the back surface, so-called card processing to be laminated on a card substrate, etc. Processing can also be performed. It is also possible to laminate the ink jet recording sheet of the present invention on both sides of paper or film so that both sides can perform ink jet recording. Also, for example, it is effective for wallpaper for architectural decoration, posters, signboards, decorative paper for decorative plywood, flooring, interior materials for automobiles, and the like.
[0036]
The liquid ink for forming a recording image is a recording liquid composed of a colorant, a liquid medium, and other additives.
Examples of the colorant include various water-soluble dyes such as direct dyes, acid dyes, and reactive dyes. The liquid medium of the water-based ink includes water alone or a combination of water and a water-soluble organic solvent. Furthermore, an oil-based ink may be used. Examples of water-soluble organic solvents include monohydric alcohols such as ethyl alcohol and isopropyl alcohol, polyhydric alcohols such as ethylene glycol, diethylene glycol, polyethylene glycol, and glycerin, triethylene glycol monomethyl ether, triethylin, triethylene glycol monomethyl ether, and triethylene. And lower alkyl ethers of polyhydric alcohols such as glycol monoethyl ether.
Furthermore, examples of the additive include a pH adjuster, a metal sequestering agent, an antifungal agent, a viscosity adjuster, a surface tension adjuster, a surfactant, and a rust preventive agent.
【Example】
Hereinafter, the present invention will be described in more detail based on examples. In the following examples, parts and% represent parts by mass and% by mass unless otherwise specified.
[0037]
Example 1
A polyester film having a thickness of 50 μm was used as a support, and an ink receiving layer coating composition having the composition of the following coating A was applied to one side and dried to prepare an ink jet recording sheet having a dried ink receiving layer thickness of 35 μm.
[0038]
[0039]
[0040]
[0041]
[0042]
[0043]
[0044]
  "Paint A"
Amorphous silica (trade name: Mizukasil P-78F, manufactured by Mizusawa Chemical Industry)
100 copies
・ Cationic polymer (substance name: diallyldimethylammonium hydrochloride;
(Product name: Unisense CP-105, manufactured by Senka) 20 parts
・ Water-soluble polymers (partially saponified polyvinyl alcohol;
(Product name: PVA420, manufactured by Kuraray) 30 parts
・ Water-insoluble polymers (ethylene / vinyl chloride copolymer;
(Product name: Sumielite 1010, manufactured by Sumitomo Chemical Co., Ltd.) 30 parts
・ Ovalbumin (Kanto Chemical) 20 parts
[0045]
Example 2
An ink jet recording sheet was prepared in the same manner as in Example 1 except that the following paint B was used as the ink receiving layer paint.
[0046]
"Paint B"
Amorphous silica (trade name: Mizukasil P-78F, manufactured by Mizusawa Chemical Industry)
100 copies
・ Cationic polymer (substance name: diallyldimethylammonium hydrochloride;
(Product name: Unisense CP-105, manufactured by Senka)                  20 copies
・ Water-soluble polymers (partially saponified polyvinyl alcohol;
(Product name: PVA420, manufactured by Kuraray)                            30 copies
・ Water-insoluble polymers (ethylene / vinyl chloride copolymer;
(Product name: Sumielite 1010, manufactured by Sumitomo Chemical)              30 copies
・ Yellow yolk (trade name: liquid yolk, manufactured by IFJI Industries)                        20 copies
[0047]
Example 3
An ink jet recording sheet was prepared in the same manner as in Example 1 except that the following paint C was used as the ink receiving layer paint.
[0048]
"Paint C"
Amorphous silica (trade name: Mizukasil P-78F, manufactured by Mizusawa Chemical Industry)
100 copies
・ Cationic polymer (substance name: diallyldimethylammonium hydrochloride;
Product name: Unisense CP-105, manufactured by Senka)20 copies
・ Water-soluble polymers (partially saponified polyvinyl alcohol;
(Product name: PVA420, manufactured by Kuraray)                            30 copies
・ Water-insoluble polymers (ethylene / vinyl chloride copolymer;
(Product name: Sumielite 1010, manufactured by Sumitomo Chemical)              30 copies
・ Lipoprotein (bovine lipoprotein cholesterol solution,
  Kanto Chemical)                                                20 copies
[0049]
Comparative Example 1
The following paints for the ink receiving layerDAn ink jet recording sheet was prepared in the same manner as in Example 1 except that was used.
[0050]
"Paint D"
Amorphous silica (trade name: Mizukasil P-78F, manufactured by Mizusawa Chemical)
100 copies
・ Cationic polymer (substance name: diallyldimethylammonium hydrochloride;
  (Product name: Unisense CP-105, manufactured by Senka) 20 parts
・ Water-soluble polymers (partially saponified polyvinyl alcohol;
(Product name: PVA420, Kuraray) 60 parts
[0051]
Comparative Example 2
The following paints for the ink receiving layerEAn ink jet recording sheet was prepared in the same manner as in Example 1 except that was used.
[0052]
"Paint E"
Amorphous silica (trade name: Mizukasil P-78F, manufactured by Mizusawa Chemical)
100 copies
・ Cationic polymer (substance name: diallyldimethylammonium hydrochloride;
  (Product name: Unisense CP-105, manufactured by Senka) 20 parts
・ Water-soluble polymers (partially saponified polyvinyl alcohol;
(Product name: PVA420, manufactured by Kuraray) 30 parts
・ Water-insoluble polymers (ethylene / vinyl chloride copolymer;
  (Product name: Sumielite 1010, manufactured by Sumitomo Chemical Co., Ltd.) 30 parts
[0053]
[0054]
[0055]
[0056]
[0057]
The ink jet recording sheets obtained in the examples and comparative examples were printed with magenta ink and ISO-400 using an imaging ink (manufactured by Hewlett Packard, dye ink) using an inkjet plotter (Designjet 2500CP; manufactured by Hewlett Packard). ("High-definition color digital standard image data ISO / JIS-SCID", p13, image name: portrait, issued by the Japan Planning Association) was evaluated, and the results are shown in Table 1. .
[0058]
"Ozone resistance"
Ozone resistance, which has a high correlation with long-term storage, was evaluated. A solid print of magenta ink and an ISO-4000 image were left in a container with an ozone concentration of 0.1 ppm for 10 hours.
In the case of solid printing, the Macbeth density after the test was measured, and the image residual ratio was calculated by the following equation. On the other hand, in the case of images, the degree of discoloration was visually observed and evaluated.
Image residual ratio (%) = [(density after processing) / (density before processing)] × 100
The image quality of ISO-4000 images was evaluated according to the following criteria.
(Image quality evaluation criteria)
A: No discoloration
B: Discoloration is slightly visible, but there is no practical problem
C: Discoloration is observed, which may cause a practical problem
D: Many discoloration colors are observed, and there are practical problems
E: Discoloration is remarkable and there are practical problems
[0059]
"Strength of ink receiving layer"
A solid print of magenta ink and an ISO-4000 image were scratched with a nail 2 minutes after printing, and evaluated according to the following criteria.
(Abrasion evaluation criteria)
○: Peeling of the ink receiving layer is hardly seen and there is no practical problem
Δ: Peeling of the ink receiving layer is observed, which may cause a practical problem
×: Peeling of the ink receiving layer is remarkable and there is a problem in practical use
[0060]
[Table 1]

[0061]
【The invention's effect】
As is apparent from Table 1, the ink jet recording sheet of the present invention was a recording sheet having very little image discoloration even when exposed to ozone gas and excellent in long-term storage stability.

Claims (1)

In an inkjet recording sheet having at least one ink-receiving layer provided on a support, ovalbumin as a preservative improver may be provided between the ink-receiving layer and the support, in the ink-receiving layer, or on the ink-receiving layer. An ink jet recording sheet comprising at least one selected from egg yolk and lipoprotein .