JP3427279B2 - Inkjet recording sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inkjet recording sheet and an inkjet recording method, and more particularly to an inkjet recording sheet using a water-soluble ink.

[0002]

2. Description of the Related Art In recent years, ink jet recording type printers have been rapidly spread with the spread of personal computers. In particular, its use is drawing attention in the printing field and design department where high image quality is required.

As a recording sheet used in the ink jet recording system, a recording sheet having an ink receiving layer (hereinafter, also referred to as an ink absorbing layer) provided on a support which is conventionally called a normal paper or an ink jet recording sheet is used. Sheets have been used. However, when these recording sheets are used, they cannot be used in the above fields where high resolution and high gloss are required, such as a large amount of ink bleeding and low gloss.

Further, even if a transparent support is used as an original for an OHP (overhead projector), there is a problem that the porous ink absorbing layer deteriorates the light transmittance.

In order to solve such a problem, a technique of an ink jet recording sheet using resin-coated paper in which both surfaces of the paper are coated with resin, so-called RC (resin coated) paper as a support and gelatin as an ink receiving layer JP-A-4-21
6990, 6-64306 and the like.

According to the above-mentioned publication, it is possible to obtain an image having a high resolution and gloss, but it is possible to stably convey a desired recording sheet due to poor conveyance of a recording sheet depending on environmental conditions during printing. There were problems such as not being able to obtain a print and causing streak-like unevenness in the print area.

On the other hand, the compound represented by the general formula [E] of the present invention is generally known as a fluorescent whitening agent, and its application to an ink jet recording sheet is described in, for example, JP-A-61-2979. Discloses that whiteness (fluorescent whitening property) is increased without lowering water resistance. However, the publication does not disclose the problems and techniques of an inkjet recording sheet using gelatin, and addition of the compound of the present invention to an ink receiving layer containing gelatin improves the above-mentioned conveyance failure. There is no mention that it will be done.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ink jet recording sheet which has high image quality in ink jet recording and stable transportability.

[0009]

The above object of the present invention can be achieved by the following constitutions.

(1) In an ink jet recording sheet in which an ink receiving layer is provided on at least one side of a support, the support is a film or a resin-coated paper in which both sides of the paper are coated with a resin. Contains an gelatin and a compound represented by the following general formula [E].

[0011]

[Chemical 3]

In the formula, X ₂ , X ₃ , Y ₁ and Y ₂ are each a hydroxyl group, a halogen atom, an alkyl group (including a substituent), an aryl group (including a substituent),

[0013]

[Chemical 4]

Alternatively, it represents --OR ₂₅ .

Here, R ₂₁ and R ₂₂ are each a hydrogen atom, an alkyl group (including a substituent) or an aryl group (including a substituent), and R ₂₃ and R ₂₄ are an alkylene group (including a substituent).
R ₂₅ represents a hydrogen atom, an alkyl group (including a substituent) or an aryl group (including a substituent), and M represents a hydrogen atom or an alkali metal atom.

(2) The ratio of the compound represented by the general formula [E] contained in the ink receiving layer is 0.1 to 10%.
(Weight ratio) The inkjet recording sheet according to the above item 1, characterized in that:

(3) The ink jet recording sheet according to the above item 1 or 2, wherein the ink receiving layer contains gelatin and a water-soluble polymer.

(4) The ink jet recording sheet according to the above item 1, 2 or 3, wherein the water-soluble polymer contains at least one compound selected from polyvinyl pyrrolidones and polyvinyl alcohols.

(5) The ink jet recording sheet as described in the above item 1, 2, 3 or 4, wherein the addition ratio of the water-soluble polymer to gelatin is 10 to 70 wt%.

(6) The ink jet recording sheet according to the above item 1, 2, 3, 4 or 5, wherein the addition ratio of the water-soluble polymer to gelatin is 40 to 60 wt%.

(7) The film surface pH of the ink receiving layer is from 3 to
10. The ink jet recording sheet according to the above item 1, 2, 3, 4, 5 or 6, which is 10.

(8) The ink jet recording sheet according to the above item 1, 2, 3, 4, 5, 6 or 7, wherein the resin is a polyolefin resin.

(9) The above 1, 2, 3, 4, characterized in that the polyolefin resin is a polyethylene resin.
An ink jet recording sheet according to the item 5, 6, 7 or 8.

(10) The above-mentioned 1, 2, 3, 4, 5, wherein the film is a polyester film.
An ink jet recording sheet according to item 6 or 7.

(11) The ink jet recording sheet according to the above item 1, 2, 3, 4, 5, 6, 7 or 10, wherein the polyester film is a polyethylene terephthalate film.

The present invention will be described in detail below.

In the above general formula [E], X ₂ , X ₃ , Y ₁ and Y ₂ are each a hydroxyl group, a halogen atom such as chlorine or bromine, an alkyl group (including a substituent), an aryl group (including a substituent). ),

[0028]

[Chemical 5]

Or —OR ₂₅ , R ₂₁ and R ₂₂ are each a hydrogen atom, an alkyl group (including a substituent) or an aryl group (including a substituent), and R ₂₃ and R ₂₄ are an alkylene group (including a substituent). the containing body), R ₂₅ represents a hydrogen atom includes alkyl groups (substituents) or aryl group (including substituted derivatives),
M represents a hydrogen atom or an alkali metal atom.

The alkyl group represented by R ₂₁ , R ₂₂ and R ₂₅ preferably has 1 to 6 carbon atoms, and the alkylene group represented by R ₂₃ and R ₂₄ has preferably 1 to 2 carbon atoms. .

The substituents of the alkyl group and aryl group represented by R ₂₁ , R ₂₂ and R ₂₅ and the alkylene group represented by R ₂₃ and R ₂₄ are hydroxy group, sulfo group, sulfoamino group and carboxamino group. Is preferred.

[0032]

[Chemical 6]

Specific examples of alkylamino group (for example, methylamino, ethylamino, propylamino, dimethylamino, cyclohexylamino, β-hydroxyethylamino, di (β-hydroxyethyl) amino, β-
Sulfoethylamino, N- (β-sulfoethyl) -N-
Methylamino, N- (β-hydroxyethyl-N-methylamino, etc.), or arylamino group (for example, anilino, o-, m-, p-sulfoanilino, o-, m-, p).
-Chloroanilino, o-, m-, p-toluidino, o
-, M-, p-carboxyanilino, o-, m-, p-
Hydroxyanilino, sulfonaphthylamino, o-, m
-, P-aminoanilino, o-, m-, p-anidino, etc.),

[0034]

[Chemical 7]

A morpholino group can be mentioned as a specific example of, and an alkoxy group (for example, methquinine, etokin, methoxyethoxy, etc.), an aryloxy group (for example, phenoxy, p-sulfophenoxy, etc.) can be given as a specific example of -OR _25.
Is mentioned.

As the alkali metal atom represented by M,
For example, it is a sodium atom, a potassium atom, or a lithium atom, preferably a sodium atom or a potassium atom.

Among the compounds represented by the above general formula [E], preferred compounds are X ₂ , X ₃ , Y ₁ and Y _2.

[0038]

[Chemical 8]

Or a compound which is —OR ₂₅ , and the most preferred compound is —OR _{25 for} X ₂ and Y ₁ and the other is

[0040]

[Chemical 9]

And the one of X ₃ and Y ₂ is -OR ₂₅
When the other

[0042]

[Chemical 10]

Is a compound that is

Specifically, the following compounds can be mentioned, but the invention is not limited thereto.

[0045]

[Chemical 11]

[0046]

[Chemical 12]

[0047]

[Chemical 13]

[0048]

[Chemical 14]

[0049]

[Chemical 15]

[0050]

[Chemical 16]

The compound represented by the general formula [E] can be prepared by a known method, for example, "Fluorescent brightening agent" edited by Chemical Industry Association.
(Published in August 1976) Can be synthesized by the usual method described on page 8. It is also possible to obtain commercial products such as Uvitex (trade name of Ciba-Geigy Co., Ltd.) and Whitex (trade name of Sumitomo Chemical Co., Ltd.).

Particularly preferred among the exemplified compounds are E-34, E-36 and E-37.

From the viewpoint of the effects of the present invention, the compound represented by the general formula [E] is preferably contained in the ink receiving layer in an amount of 0.1 to 10% by weight, more preferably 0.5 to 5%.
% By weight. If it is less than 0.1%, the effect of the present invention cannot be obtained, and if it exceeds 10%, the gloss and transparency of the surface of the receiving layer are lost, which is not preferable.

As the gelatin according to the present invention, any gelatin derived from animal collagen can be used, but gelatin derived from pig skin, cow skin or cow bone is preferred. Further, the kind of gelatin is not particularly limited, but lime-processed gelatin, acid-processed gelatin, gelatin derivatives (for example, Japanese Patent Publication No. 38-4854).
No. 39, No. 5514, No. 40-12237, No. 4
2-26345, U.S. Pat. Nos. 2,525,753, 2,594,293, 2,614,928, 2,763,639, 3,118,766, and 3,132. , 945, 3,186,846, 3,312,553, British Patents 861,414, 103,189, etc.) can be used alone or in combination. .

The jelly strength of the gelatin according to the present invention (PA
GI method, by Bloom type jelly strength meter) is 1
It is preferably 50 g or more, and particularly preferably 200 to 300 g.

In the present invention, the coating amount of gelatin contained in the ink receiving layer is 3 to 50 g in terms of solid content.
/ M ² is preferable, and more preferably 5 to 30 g / m ^2.
Is. When the ink receiving layer is less than 3 g / m ² , the ink receiving property is poor and the ink overflows from the receiving layer after printing.
Further, when the amount exceeds 50 g / m ² , the ink receptivity is improved, but problems such as cracking and curling occur.

In the present invention, the following water-soluble polymers are preferably used in combination with gelatin for the purpose of improving the ink receptivity and dot reproducibility. Examples of the water-soluble polymer used in combination include polyvinyl alcohol,
Polyvinylpyrrolidone, polyvinylpyridinium halides, vinyl formals such as various modified polyvinyl alcohols and their derivatives (JP-A-60-145879, 60-220750, 61-143177, 6).
1-235182, 61-235183, 61
-237681, 61-261089), polyacrylamide, polydimethylacrylamide, polydimethylaminoacrylate, sodium polyacrylate,
Acrylic group-containing polymers such as acrylic acid / methacrylic acid copolymer salt, poly (methacrylic acid) soda, vinyl acrylate / vinyl alcohol copolymer salt (JP-A-60-168651).
No. 62-9988, etc.), starch, oxidized starch,
Carboxyl starch, dialdehyde starch, cationized starch, dextrin, sodium alginate, gum arabic,
Casein, pullulan, dextran, methyl cellulose, ethyl cellulose, carboxymethyl cellulose,
Natural polymer materials such as hydroxypropyl cellulose or derivatives thereof (JP-A-59-174382 and JP-A-60-74382)
No. 262685, No. 61-143177, No. 61-1
81679, 61-193879, 61-28.
No. 7782), polyethylene glycol, polypropylene glycol, polyvinyl ether, polyglycerin, alkyl vinyl ether maleate copolymer,
Maleic acid-N-vinylpyrrole copolymer, styrene-
Synthetic polymers such as maleic anhydride copolymers and polyethyleneimine (JP-A-61-32787 and 61-237).
No. 680, No. 61-277483, etc.) and the like. Of these polymers, polyethylene glycol, polyvinylpyrrolidone and polyvinyl alcohol are preferable, and polyvinylpyrrolidone and polyvinyl alcohol are more preferable. From the viewpoint of stickiness on the surface, these polymers preferably have an average molecular weight of 10,000 or more, more preferably 100,000 or more.

In the present invention, the addition ratio (wt%) of the water-soluble polymer used in combination to gelatin varies depending on the type of the water-soluble polymer used in combination, but in order to improve ink receptivity and dot reproducibility, gelatin is used. Against 1
It is preferably 0 to 70 wt%, and more preferably 40 to 60 wt%.

In the present invention, the ink receiving layer can be hardened with an appropriate hardener for the purpose of improving water resistance and dot reproducibility. Specific examples of the hardener include aldehyde compounds such as formaldehyde and glutaraldehyde, ketone compounds such as diacetyl and chloropentanedione, bis (2-chloroethylurea), 2-hydroxy-4,6-dichloro-1. , 3,5-triazine,
Reactive halogen-containing compounds such as those described in US Pat. No. 3,288,775, divinyl sulfone, US Pat.
Compounds having a reactive olefin as described in US Pat. No. 635,718, N-methylol compounds described in US Pat. No. 2,732,316, isocyanates as described in US Pat. No. 3,103,437, US Pat. , 280,
No. 2,983,611, aziridine compounds, US Pat. No. 3,100,704, carbodiimide compounds, US Pat. No. 3,091,537, epoxy compounds, and mucochloric acid, halogen carboxy. There are aldehydes, dioxane derivatives such as dihydroxydioxane, chromium alum, potassium alum, and inorganic hardeners such as zirconium sulfate, and these may be used alone or in combination of two or more. The amount of the hardener added is preferably 0.01 g to 10 g, and more preferably 0.1 to 5 g, per 100 g of the binder constituting the ink receiving amount.

In the present invention, the ink receiving layer further includes a surfactant, a binder and a hardener, as well as an inorganic pigment, a coloring dye, a coloring pigment, an ink dye fixing agent, an ultraviolet absorber, an antioxidant and a pigment. Various known additives such as a dispersant, a defoaming agent, a leveling agent, a preservative, a fluorescent whitening agent, a viscosity stabilizer, and a pH adjusting agent can also be added.

As a method for applying the ink receiving layer coating liquid in the present invention, a commonly used application method (for example, curtain method, extrusion method, air knife method,
Roll coating method, rod bar coating method, etc.) are used.

In the present invention, the ink receiving layer may have a single layer structure or a multilayer structure. Examples of the multi-layer structure include JP-A Nos. 57-89954, 60-224578 and 61.
Examples thereof include those described in No. 12388 and the like. For example, the ink permeable layer described in JP-A-61-2138 may be further received on the ink receiving layer of the present invention.

Although the ink receiving layer is provided on at least one side of the support, it may be provided on both sides of the support for the purpose of preventing curling.

With respect to the film surface pH of the ink receiving layer of the present invention, about 0.05 ml of pure water is dropped onto a dry ink receiving layer by using a commercially available flat surface measuring silver / silver chloride electrode, and a water drop portion is dropped. It is a value at 25 ° C. measured by pressing the above electrode. The film surface pH is preferably 3 to 10, and more preferably 4
~ 8. When the pH is lower than 3, the glossiness in printing is lost, and when the pH is higher than 10, the whiteness of the unprinted part deteriorates with time.

The support used in the present invention may be either a transparent support or an opaque support depending on the purpose of use.

As the transparent support, any of the conventionally known supports can be used, and examples thereof include films of polyester resin, cellulose acetate resin, acrylic resin, polycarbonate resin, polyvinyl chloride resin, polyimide resin, cellophane, celluloid and the like. is there. Among these, a polyester resin, particularly a polyethylene terephthalate film, is preferable from the viewpoint of rigidity and transparency of the support. The thickness of such a transparent support is preferably about 10 to 200 μm, more preferably 50 to 150 μm.
It is of a degree.

As the opaque support, any of conventionally known ones such as resin-coated paper, opaque film containing pigment, and foamed film can be used. However, resin-coated paper and various films are preferable from the viewpoint of glossiness and smoothness, and they have a touch. A resin-coated paper, a polyolefin resin-coated paper, and a polyester film are more preferable from the viewpoint of feeling and high quality.

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

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

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

As the resin for the resin-coated paper, a polyolefin resin or a resin curable with an electron beam can be used.
The polyolefin resin is a homopolymer of olefin such as low density polyethylene, high density polyethylene, polypropylene, polybutene, polypentene or a copolymer of two or more olefins such as ethylene-propylene copolymer and a mixture thereof. Various densities and melt viscosity indexes (melt indexes) can be used alone or in combination.

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

The resin-coated paper, which is a support preferably used in the present invention, is produced by a so-called extrusion coating method in which a resin melted by heating is cast in the case of a polyolefin resin on a running base paper, and both surfaces of the resin are coated. Is covered by. In the case of a resin that is cured by an electron beam, the resin is applied by a commonly used coater such as a gravure coater or a blade coater, and then the resin is irradiated with an electron beam to cure and coat the resin. Further, it is preferable to perform activation treatment such as corona discharge treatment or flame treatment on the base paper before coating the base paper with the resin. The surface (surface) of the support to which the ink receiving layer is applied has a glossy surface, a matte surface or the like depending on the application, and the glossy surface is particularly predominantly used. It is not necessary to coat the back surface with a resin, but it is preferable to coat the resin from the viewpoint of preventing curling. The back surface is usually a matte surface, and the front surface or both front and back surfaces can be subjected to activation treatment such as corona discharge treatment and flame treatment, if necessary. The thickness of the coating resin layer is not particularly limited, but is generally 5 to 50 μm and is coated on the surface or both front and back surfaces.

The aqueous ink referred to in the present invention is a recording liquid containing the following colorant, liquid medium and other additives.
Examples of the colorant include water-soluble dyes such as direct dyes, acid dyes, basic dyes, reactive dyes and food dyes.

As the solvent of the aqueous ink, water and various water-soluble organic solvents such as methyl alcohol, ethyl alcohol, propyl alcohol, isopropyl alcohol, butyl alcohol, sec-butyl alcohol, t
ert-butyl alcohol, isobutyl alcohol, and other alkyl alcohols having 1 to 4 carbon atoms; amides such as dimethylformamide and dimethylacetamide; ketones and ketone alcohols such as acetone and diacetone alcohol; ethers such as tetrahydrofuran and dioxane; Polyalkylene glycols such as polyethylene glycol and polypropylene glycol; alkylene groups such as ethylene glycol, propylene glycol, butylene glycol, triethylene glycol, 1,2,6-hexanetriol, thiodiglycol, hexylene glycol and diethylene glycol having 2 to 2 alkylene groups. 6 alkylene glycols; glycerin, ethylene glycol methyl ether, diethylene glycol methyl (or ethyl) ether, triethyl Glycol, lower alkyl ethers of polyhydric alcohols such as mono-methyl ether,
Pyrrolidinones such as 2H-pyrrolidinone, 1-methyl-
Examples thereof include pyrrolidones such as 2-pyrrolidone and 2-pyrrolidone. Among these many water-soluble organic solvents,
Preferred are polyhydric alcohols such as diethylene glycol, lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl ether and triethylene glycol monoethyl ether, and pyrrolidones.

In the present invention, the solvent of the ink is preferably a mixed solvent of water and the organic solvent from the viewpoint of preventing clogging of the ink head nozzle. At this time, the mixing ratio of water and the organic solvent is 1 by weight. / 9 to 9/1 is preferable, and more preferably 4/6 to 9/1.

Other additives include, for example, a pH adjusting agent, a sequestering agent, an antifungal agent, a viscosity adjusting agent, a surface tension adjusting agent, a wetting agent, a surfactant and a rust preventive agent.

[0078]

The present invention will be described in detail below with reference to examples, but the embodiments of the present invention are not limited thereto.

Example 1 RC paper (20 g / m ^{2 of a} resin composition consisting of low-density polyethylene (70 parts) and high-density polyethylene (20 parts) was applied to the surface of a base paper having a basis weight of 100 g, and low density was applied to the back surface. 20 g / m ^{2 of a} resin composition consisting of polyethylene (50 parts) and high-density polyethylene (50 parts) was applied), and the film weight after drying the ink receiving layer coating liquid having the following composition was 8 g / m ^2.
Was applied by a bar coating method and then dried to obtain an ink jet recording sheet sample.

<Coating Liquid Composition for Ink Receptive Layer> Lime-treated gelatin (Bloom strength; 250 g) 49 parts by weight PVP-K90 (BASF) 49 parts by weight Additives (described in Table 1) 2 parts by weight Surfactant (Megafuck) F-120) 0.3 parts by weight * Solid content concentration of coating liquid 8% (wt / vol) Coating liquid pH: adjusted to 7.5 using a 5% NaOH aqueous solution.

Next, the obtained sample was used with an ink jet printer (MJC-700V2C, manufactured by Epson Corporation) and a dedicated ink under the environment of 25 ° C. and 80% RH to obtain yellow (Y), magenta (M), cyan ( C), blue (B), green (G), red (R), and black (K) are printed, and the unevenness of the uniform image area is observed.
evaluated. Further, each sample was continuously transported to evaluate the transportability.

The evaluation method is shown below.

<Evaluation of unevenness of uniform image area: B, G, R, K
The presence or absence of streak-like unevenness was judged by visually observing the uniform image portion of each color. > Evaluation criteria: ◎ No streak-like unevenness is observed at all, which is very good ○ Slightly streak-like unevenness is observed, but there is no problem △ Streak-like unevenness is observed, but it is a practical problem There is no x streak-like unevenness, which is not practical.

<Glossiness of image area: A uniform K image area was visually observed to determine the glossiness. > Evaluation criteria: ○ Excellent without any problem △ Slightly lost gloss, but practically no problem × Loss gloss, unusable.

<Transportability: The sample obtained by the above operation was A
It was cut into 4 sizes, 50 sheets were piled up and set in the long side direction, and continuously conveyed. At this time, the state of transportation was visually observed to determine the transportation property. > Evaluation criteria: ○ All prints are transferred without any problems, and print positions do not deviate. △ There are 1 or 2 prints among 50 out of 50 prints. × No transfer, no manual transfer is required.

[0086]

[Table 1]

From Table 1 above, the ink jet recording sheet of the present invention gives good results in all evaluation items (uniformity of uniform image area, glossiness, and transportability), and the recording sheet of the present invention is used. As a result, it can be seen that a stable and high-quality image can be obtained.

Example 2 An ink jet recording sheet was prepared in the same manner as in Example 1 except that in Sample 1-5 prepared in Example 1, the additive amount was changed as shown in Table 2 below. Example 1
In addition to the same evaluation as above, the glossiness of the non-image area was visually evaluated.

<Evaluation of non-image area glossiness> ◎ good ○ The gloss of the non-image area is slightly lost △ The gloss of the non-image area is lost The results are shown in Table 2.

[0090]

[Table 2]

From Table 2 above, it can be seen that the compound of the present invention has a high effect on both surface glossiness and transportability in the range of 0.1 to 10% in the ink receiving layer.

Example 3 An ink jet recording sheet was prepared in the same manner as in Example 1 except that the water-soluble polymers shown in Table 3 were added to Samples 1-6 prepared in Example 1 and the same as in Example 1. In addition to the evaluation above, the ink absorbency was evaluated.

<Evaluation of Ink Absorption: After printing a uniform image of B, G, R, and K for 3 minutes, commercially available high-quality paper was overlaid, and the degree of transfer of ink to the high-quality paper was visually observed. It was observed and judged. > Evaluation Criteria ⊚: B, G, R and K are not transferred at all, and there is no problem. ◯: Transfer of K is slightly observed, but there is no problem in practical use. Δ: Slight transfer of B, G, R and K. Transcription is recognized, but there is no problem in practical use x: Table 3 shows the results in which B, G, R, and K transcription are recognized.

[0094]

[Table 3]

As is clear from the results shown in Table 3, when the water-soluble polymer is added to the ink receiving layer, the ink absorbability is further improved in addition to the effect of the present invention. Particularly, polyvinylpyrrolidones and polyvinyl alcohols are used. It turns out that the effect is higher.

Example 4 Example 3 was the same as Example 3 except that the pH of the coating liquid was adjusted and the film surface pH of the ink receiving layer was changed as shown in Table 4 in the preparation of Sample 3-5 used in Example 3. In the same manner, an inkjet recording sheet was produced, and in addition to the evaluation of Example 3, the glossiness of the non-image area was visually evaluated.

The results are shown in Table 4.

[0098]

[Table 4]

From Table 4 above, it is understood that when the film surface pH of the ink receiving layer is in the range of 7 to 11, the ink absorbency is improved in addition to the effect of the present invention, and the effect of the present invention is further improved. . Example 5 A sample was prepared with the same coating solution composition as in Example 1 except that a white polyethylene terephthalate film (100 μm) was used in place of the RC paper used in Example 1, and an experiment was conducted. As a result, almost the same result as in Example 1 was obtained.

[0100]

The ink jet recording sheet according to the present invention makes it possible to obtain high image quality and stable transportability.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41M 5/00 CAPLUS (STN) REGISTRY (STN)

Claims (11)

(57) [Claims] 1. An ink jet recording sheet having an ink-receiving layer on at least one side of a support, wherein the support is a film or a resin-coated paper in which both sides of the paper are coated with a resin. An ink jet recording sheet comprising gelatin and a compound represented by the following general formula [E]. [Chemical 1] In the formula, X ₂ , X ₃ , Y ₁ and Y ₂ are each a hydroxyl group, a halogen atom, an alkyl group (including a substituent), an aryl group (including a substituent), and Alternatively, it represents -OR ₂₅ . Here, R ₂₁ and R ₂₂ are each a hydrogen atom, an alkyl group (including a substituent) or an aryl group (including a substituent), R ₂₃ and R ₂₄ are an alkylene group (including a substituent), R ₂₅ Represents a hydrogen atom, an alkyl group (including a substituent) or an aryl group (including a substituent), and M represents a hydrogen atom or an alkali metal atom. 2. The inkjet according to claim 1, wherein the ratio of the compound represented by the general formula [E] contained in the ink receiving layer is 0.1 to 10% (weight ratio). Recording sheet. 3. The ink receiving layer according to claim 1, wherein the ink receiving layer contains gelatin and a water-soluble polymer.
The inkjet recording sheet described above. 4. The water-soluble polymer contains at least one compound selected from polyvinylpyrrolidones and polyvinyl alcohols,
2. The inkjet recording sheet according to 2 or 3. 5. The ink jet recording sheet according to claim 1, wherein the addition ratio of the water-soluble polymer to gelatin is 10 to 70 wt%. 6. The ink jet recording sheet according to claim 1, wherein the addition ratio of the water-soluble polymer to gelatin is 40 to 60 wt%. 7. The film surface pH of the ink receiving layer is 3 to 10.
The inkjet recording sheet according to claim 1, 2, 3, 4, 5, or 6. 8. The resin according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the resin is a polyolefin resin.
The inkjet recording sheet described above. 9. The method according to claim 1, wherein the polyolefin resin is a polyethylene resin.
An ink jet recording sheet according to 5, 6, 7 or 8. 10. The film of claim 1, wherein the film is a polyester film.
Alternatively, the inkjet recording sheet described in 7 above. 11. The inkjet recording sheet according to claim 1, wherein the polyester film is a polyethylene terephthalate film.