JPH09226233A - Ink jet recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the ink absorbing properties and water resistance of an ink jet recording sheet. SOLUTION: Ink absorbing layer formed of water absorbing polymer or water soluble polymer crosslinking material containing epoxy group is formed on one or both sides of a support to obtain an ink jet recording sheet. The polymer having the epoxy group is formed of polyvinyl alcohol, polyvinyl pyrrolidone, poly(meth)acrylic acid or its salt, and the content of the monomer unit having the epoxy group is about 0.01 to 5mol% to the entire polymer. The polymer containing the epoxy group can be crosslinked by heating or crosslinker (such as polyoxyalkylene diamine).

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 more particularly to a recording sheet which can be printed on one or both sides of a transparent support with an inkjet printer.

[0002]

2. Description of the Related Art Ink jet printers are widely used as printing / outputting devices for computer recording devices, word processors, copiers, etc. because they are inexpensive, low noise, high speed, and capable of color printing. The ink components of an inkjet printer are generally composed mainly of dyes, binders, solvents, additives, and the like, and water for dissolving these components. For this reason, the ink jet printer recording material needs to have a property of sufficiently absorbing such an ink and preventing the ink from bleeding. Therefore, a surface-treated paper or the like is often used.

With the demand for color presentations, there is an increasing demand for printing on an overhead projector (OHP) sheet by an inkjet printer. However, a normal OHP sheet has no water absorption and is not practical.

Various attempts have been made to print on an OHP sheet with an ink jet printer. As a general attempt, coating a water-absorbing or hydrophilic resin (such as polyvinyl alcohol) on a transparent substrate (JP-A-60-44386), and adding an inorganic substance to the water-absorbing or hydrophilic resin. (JP-A-60-224
579, etc.), addition of a copolymer of olefin or styrene and maleic anhydride as a cross-linking agent to polyvinyl alcohol (JP-A-60-234879, etc.), and use of epoxy group-modified polyvinyl alcohol (special (Kaisho 62-278080, etc.) is known. However, an inkjet recording sheet having a well-balanced ink absorption, resin water resistance and transparency has not been obtained.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an ink jet recording sheet excellent in ink absorbency and water resistance. Another object of the present invention is to provide an OHP sheet for inkjet, which has transparency, ink absorbency, and water resistance at a high level and in good balance.

[0006]

Means for Solving the Problems As a result of intensive studies for achieving the above-mentioned object, the present inventor has found that when an epoxy group-containing water-absorbing polymer or water-soluble polymer is crosslinked, the ink absorbency and water resistance are increased. The present invention has been completed by finding that it can be greatly improved. That is, the ink jet recording sheet of the present invention is an ink absorbing sheet having an ink absorbing layer on one side or both sides of a support, wherein the ink absorbing layer is a water-absorbing polymer containing an epoxy group or a high water-soluble polymer. It is composed of cross-linked molecules. The polymer having an epoxy group can be composed of, for example, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid or a salt thereof. The polymer can be crosslinked, for example, by heating or a crosslinking agent.

[0007]

The material of the support of the present invention is not particularly limited, and the support having a two-dimensional structure, for example, paper,
Examples include coated paper, non-woven cloth, and plastic film, and among these, the plastic film is preferable. Examples of the polymer constituting the plastic film include polyolefins such as polyethylene and polypropylene, ethylene-vinyl acetate copolymer, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, poly (meth) acrylic acid ester, polystyrene, polyvinyl. Alcohol, ethylene-vinyl alcohol copolymer, cellulose derivative such as cellulose acetate, polyester (polyalkylene terephthalate such as polyethylene terephthalate and polybutylene terephthalate, polyalkylene naphthalate such as polyethylene naphthalate and polybutylene naphthalate), polycarbonate, Polyamide (polyamide 6, polyamide 6/6, polyamide 6/10, polyamide 6/12, etc.), polyester amide, polyether, polyimid , Polyamideimide, polyether ester and the like, further, these copolymers, blends, may be used crosslinked product.

Of these films, polyolefins (particularly polypropylene), polyesters (particularly polyethylene terephthalate), polyamides, etc. are usually used, and polyesters (particularly polyethylene terephthalate) are particularly preferred from the viewpoints of mechanical strength and workability. .

If necessary, conventional additives such as antioxidants, ultraviolet absorbers, heat stabilizers, lubricants and pigments may be added to the plastic film. Further, in order to improve the adhesiveness with the ink absorbing layer, surface treatment such as corona discharge treatment or undercoat treatment may be performed.

The thickness of the support is, for example, 20 to 200 μm.
It can be selected from a range of about m, and is preferably 50 to 170 μm.
m, and more preferably about 80 to 150 μm. If the thickness of the support is less than 20 μm, it will be difficult to insert it into the printer, warp the sheet and handle the sheet from the viewpoint of strength and rigidity, and if it is more than 200 μm, the price per sheet will increase and the weight of the sheet will increase. Due to the increase in the number of sheets, the portability of a large number of sheets is likely to deteriorate.

An ink absorbing layer is formed on one side or both sides of the support to form an ink jet recording sheet (ink absorbing sheet). The ink absorbing layer is composed of a cross-linked product of a water-absorbing polymer or a water-soluble polymer containing an epoxy group (hereinafter sometimes simply referred to as an epoxy group-containing resin). The ink absorbing layer is not particularly limited as long as it is composed of a cross-linked product of an epoxy group-containing resin, and the epoxy group-containing resin is (1) a homopolymer or a copolymer having a monomer unit having an epoxy group, (2) ) Any resin such as an epoxidized resin obtained by epoxidizing the resin itself may be used.

In the epoxy group-containing resin (1),
Examples of the epoxy group-containing monomer include a vinyl group-containing polymerizable compound. Examples of such epoxy group-containing monomers include allyl glycidyl ether, glycidyl methacrylate, glycidyl acrylate, methallyl glycidyl ether, 1-allyloxy-3,
4-epoxybutane, 1- (3-butenyloxy)-
Examples include 2,3-epoxypropane and 4-vinyl-1-cyclohexene-1,2 epoxide. These epoxy-containing monomers can be used alone or in combination of two or more. Preferred epoxy-containing monomers include allyl glycidyl ether, glycidyl (meth) acrylate and the like from the viewpoint of hydrolyzability during resin production.

The copolymerizable monomer that reacts with the epoxy group-containing monomer to form a water-absorbing polymer or a water-soluble polymer includes, for example, olefins or dienes (ethylene, propylene, butadiene, etc.). , Maleic acid dialkyl esters, vinyl esters (vinyl acetate, vinyl propionate, etc.), (meth) acrylic monomers [methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, etc. ) Acrylate, 2-hydroxyethyl (meth) acrylate, hydroxy-containing (meth) acrylate such as 2-hydroxypropyl (meth) acrylate, N, N
-Amino group-containing (meth) acrylates such as diethylaminoethyl (meth) acrylate, amide group-containing monomers such as (meth) acrylamide, vinyl cyanide such as (meth) acrylonitrile, etc.], vinylpyrrolidone,
Heterocyclic vinylamines such as vinylimidazole, allyl-based monomers (allyl alcohol, allyl isocyanate, etc.), monomers containing sulfonic acid groups or salts thereof (styrene sulfonic acid and its sodium salts, etc.), carboxyl groups Or a monomer containing a salt thereof (carboxyl group such as (meth) acrylic acid, crotonic acid, maleic acid monoalkyl ester or a salt thereof such as sodium salt), a monomer containing an acid anhydride group ( Maleic anhydride, etc., vinyl monomers (vinyl isocyanate, aromatic vinyl monomers such as styrene, vinyl methyl ether, vinyl ethyl ether, vinyl isobutyl ether and other vinyl ethers, vinyl trisalkoxysilane, vinyl chloride, vinylidene chloride) Such as halogen-containing vinyl monomers) And the like. These copolymerizable monomers may be used alone or in combination of two or more.

Preferred copolymerizable monomers include hydrophilic monomers having a hydrophilic group (for example, a carboxyl group, a sulfonic acid group or salts thereof, a hydroxyl group, an ether group, etc.), particularly an ether. Group, especially vinyl monomer having oxyalkylene unit, for example, the number of alkylene oxide units (additional mol) is 1 to 100, preferably 2 to 80 (for example, 5 to 80), and more preferably 5 to 70 ( For example, about 10 to 50) (meth) acrylic acid ester or allyl ether can be used. The vinyl monomer having an oxyalkylene unit includes, for example,
Diethylene glycol mono (meth) acrylate, triethylene glycol mono (meth) acrylate, polyethylene glycol mono (meth) acrylate, dipropylene glycol mono (meth) acrylate, tripropylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, Diethylene glycol monoallyl ether, triethylene glycol monoallyl ether, polyethylene glycol monoallyl ether, dipropylene glycol monoallyl ether, tripropylene glycol monoallyl ether,
Polypropylene glycol monoallyl ether and the like are included. These vinyl monomers can be used alone or in combination of two or more. Preferred monomers include (meth) acrylates of vinyl monomers whose oxyalkylene units are oxyethylene units, especially polyoxyalkylene allyl ethers (among others, polyoxyethylene allyl ether).

The proportion of these hydrophilic monomers can be selected within a range that does not impair the sharpness and water resistance of the image, and is, for example, 0.1 to 50 mol%, preferably 1 with respect to the total amount of the monomers. Is about 30 to 30 mol%, more preferably about 2.5 to 25 mol% (for example, 3 to 20 mol%).

Other preferred copolymerizable monomers include vinyl esters (such as vinyl acetate), vinylpyrrolidone,
(Meth) acrylic monomer ((meth) acrylic acid C _1-8
Alkyl ester etc.), monomer containing carboxyl group or its salt ((meth) acrylic acid or its salt etc.)
Is included. When vinyl esters are used as the copolymerizable monomer, the vinyl ester units in the water-absorbing or water-soluble polymer may be hydrolyzed to form vinyl alcohol units. For example, a vinyl alcohol-allyl glycidyl ether copolymer can be obtained by hydrolyzing a vinyl acetate-allyl glycidyl ether copolymer, and the saponification degree is, for example, 70 to
It may be about 100%. These copolymerizable monomers may be used alone or in combination of two or more.

The amount (content) of the epoxy group-containing monomer used is 0.01 to 10 mol% based on the total amount of the monomers.
(For example, 0.01 to 5 mol%), preferably 0.1 to
3 mol% (eg 0.2-2.5 mol%), especially 0.
It is about 2 to 2 mol%. If the epoxy group content is low, the resin is not crosslinked or the degree of crosslinking is insufficient, so sufficient water resistance, ink absorption, and absorption rate cannot be obtained, and even if the epoxy group content is too high, the degree of crosslinking is excessive. Therefore, sufficient ink absorbency and absorption speed cannot be obtained.

In the epoxy group-containing resin (2),
As a method of epoxidizing a water-absorbing polymer or a water-soluble polymer, active hydrogen atoms (for example, hydroxyl group, amino group,
A method of introducing an epoxy group by reacting epichlorohydrin with a water-absorbent polymer having a carboxyl group or the like) or a water-soluble polymer can be adopted. Examples of such water-absorbing polymers or water-soluble polymers include water-absorbing natural polymers and their derivatives (starch, corn starch, alginic acid or salts thereof (sodium salt, etc.), gum arabic, gelatin, casein, dextrin, etc.), cellulose Derivatives (methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, cellulose sulfate, cyanoethyl cellulose, etc.),
Vinyl alcohol-based polymers (polyvinyl alcohol, ethylene-vinyl alcohol copolymer, etc.), polyethylene oxide, acrylic-based polymers [2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate and other hydroxy-containing (meth ) Copolymers containing acrylate, acrylic acid-polyvinyl alcohol copolymers, etc.], vinyl monomer copolymers having oxyalkylene units (copolymers containing polyethylene glycol monoallyl ether, copolymers containing polypropylene glycol monoallyl ether) Etc.), and these water-absorbing polymers or water-soluble polymers can be used alone or in combination of two or more. The amount of the epoxy group introduced is 0.01 to 1 with respect to the entire polymer, as described above.
0 mol% (for example, 0.01 to 5 mol%), preferably 0.1 to 3 mol% (for example, 0.2 to 2.5 mol%),
Particularly, it is about 0.2 to 2 mol%.

Preferred polymers having an epoxy group are, for example, polyvinyl alcohol, polyvinylpyrrolidone,
Water-soluble acrylic resin (for example, carboxyl group-containing (meth) acryl such as poly (meth) acrylic acid or its salt, (meth) acrylic acid C _1-8 alkyl ester- (meth) acrylic acid copolymer or its salt) Resin or its salt)
It can be composed of at least one selected from.

In the ink absorbing layer, the epoxy group-containing resin constitutes a crosslinked body. Therefore, water resistance can be improved while maintaining high ink absorbency. The epoxy group-containing resin may be crosslinked with heat and / or a crosslinking agent. That is, in the absence of a cross-linking agent, the temperature is lower than the heat resistant temperature of the support and is a temperature at which cross-linking is possible (e.g.
The epoxy group-containing resin may be crosslinked by heating to 50 ° C, preferably about 110 to 130 ° C. In order to complete the cross-linking, it is advantageous to cross-link with a cross-linking agent to form a cross-linked product. When a cross-linking agent is used, heating may not be necessary depending on the type of the cross-linking agent, but it is usually 50 to 120 ° C, preferably 80 to 110 ° C.
It is efficient to heat the resin to a certain degree to crosslink the epoxy group-containing resin.

As the cross-linking agent, a compound which can react with an epoxy compound (epoxy curing agent), such as polycarboxylic acid or acid anhydride, amines (primary or secondary amine, etc.) and the like are usually used. It can be used. Examples of the acid anhydrides include aliphatic acid anhydrides (polydecylic acid anhydrides such as dodecenyl succinic anhydride, polyadipic acid anhydride, and polysebacic acid anhydride), alicyclic acid anhydrides (methyltetrahydrophthalic anhydride, Methyl hexahydrophthalic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride,
Methylcyclohexene tetracarboxylic acid anhydride, etc.),
Aromatic acid anhydrides (phthalic anhydride, trimellitic anhydride,
Pyromellitic dianhydride, benzophenone tetracarboxylic acid anhydride, ethylene glycol bis (anhydrotrimate) and the like) and halogenated acid anhydrides (het anhydride, tetrabromophthalic anhydride and the like) can be mentioned. Examples of the polycarboxylic acid include compounds corresponding to the above acid anhydrides.

The amines include aliphatic polyamines [ethylenediamine, tetramethylenediamine, hexamethylenediamine, octamethylenediamine, dipropylenediamine, diethylenetriamine, triethylenetetramine, tetramethylenepentamine, diethylaminopropylamine, etc.], polyamide polyamines ( Polyaminoamides produced by reaction of fatty acid or fatty acid derivative with polyamine), alicyclic polyamines [mensendiamine, isophoronediamine, N-aminoethylpiperazine, 3,9-bis (3-aminopropyl) -2,4 ，
8,10-tetraoxaspiro (5.5) undecane,
Bis (4-amino-3-methylcyclohexyl) methane, bis (4-aminocyclohexyl) methane, etc.],
Aromatic polyamines [meta-xylenediamine, diaminodiphenylmethane, diaminodiphenylsulfone, m-phenylenediamine, etc.], dicyandiamide, dihydrazides (polyhydric carboxylic acid dihydrazides such as adipic acid dihydrazide), polyether type diamines or polyamines (polyoxypropylenediamine) , Polyoxyethylenediamine, polyoxymethylenediamine, polyoxybutylenediamine, and the like, such as diamines or polyamines whose main chain is an alkylene oxide and has an amino group at the end), and silicone-based diamines.

Among these crosslinking agents, polyoxyalkylene type diamines or polyamines (that is, polyether type diamines or polyamines) in terms of ink absorbability,
For example, polyoxypropylene diamine, polyoxyethylene diamine (diethylene glycol bispropyl amine, polyoxyethylene diamine, etc.), polyoxymethylene diamine, polyoxybutylene diamine, polyamine in which amino group is introduced at the end of polyhydric alcohol-alkylene oxide adduct, etc. Is preferred.

The addition amount of the cross-linking agent can be selected according to the epoxy group concentration of the epoxy group-containing resin, the number of functional groups of the cross-linking agent, and the like, for example, 0.01 to 5 mol per mol of the epoxy group of the epoxy group-containing resin. , Preferably 0.05 to 3 mol (eg 0.1 to 2 mol), more preferably 0.2.
It is about 5 to 0.75 mol. If the amount of the cross-linking agent added is too small, the degree of cross-linking becomes insufficient and the water resistance and the like tend to decrease, and if it is too large, the free terminal hydrophilic groups of the cross-linking agent are generated, and the water resistance tends to decrease.

The thickness of the ink absorbing layer can be selected within a range that does not impair the ink absorbing property, for example, 1 to 50 μm,
It is preferably about 5 to 20 μm. If the ink absorption layer is too thin, the ink from the inkjet printer cannot be completely absorbed, and if it is too thick, the warp of the sheet, the price increase, the handleability of the sheet and the like are likely to be impaired.

In the ink absorbing layer, conventional additives such as antifoaming agents, coatability improvers, thickeners, lubricants, stabilizers (antioxidants, ultraviolet absorbing agents) are used as long as the characteristics of the ink absorbing layer are not impaired. Agents, heat stabilizers, etc.), antistatic agents, pigments and fillers,
An anti-blocking agent or the like may be added.

The ink absorbing layer is formed by applying a coating solution prepared using an appropriate solvent (water, a hydrophilic solvent which may be water-soluble, a hydrophobic solvent or a mixed solvent thereof) to a support. it can. The coating liquid is a conventional casting or coating method, for example, a roll coater, an air knife coater,
It is cast or coated on at least one surface of the support by a blade coater, a rod coater, a bar coater, a comma coater, a gravure coater, a silk screen coater method or the like. After the application of the coating liquid, in order to crosslink the epoxy group-containing resin of the ink absorption layer, heating is usually performed at an appropriate temperature selected from the range of about 50 to 150 ° C. depending on the presence or type of the crosslinking agent. Drying is performed.

If desired, a porous layer may be formed on the ink absorbing layer. INDUSTRIAL APPLICABILITY The recording sheet of the present invention is useful as an inkjet recording sheet for recording by ejecting ink droplets, but also used as a printing sheet for offset printing, flexo printing, etc. (especially a sheet for aqueous ink) it can.

[0029]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. The evaluation methods of various characteristic ink absorbency, water resistance, and printing state in Examples and Comparative Examples are as follows. An inkjet printer (manufactured by Canon Inc., BJC-600) was added to the recording sheets obtained in Examples and Comparative Examples.
S) was used to solidly print each color of cyan, magenta, yellow, and black to form a recorded image. [Ink absorbency] After printing, place a copy machine paper (PPC copy paper) on the print pattern at regular intervals, apply a load (500 g / cm ² ) on it for 5 seconds, and then peel off the copy paper. The state of transfer of the ink to the copy paper was visually determined, and the ink absorption was evaluated according to the following criteria based on the time when the transfer of the ink was stopped. ◯: Ink does not transfer within 1 minute after printing Δ: Ink does not transfer within 3 minutes after printing ×: 3 minutes or more after printing until ink does not transfer [Water resistance] Printing pattern after printing The part was wiped 10 times with a hydrated cotton swab, and the degree of ink removal was visually judged according to the following criteria. ◯: No change Δ: Printed part becomes slightly thin ×: Wipe part is completely removed [Printing condition] The printing pattern was visually observed and the printing condition was evaluated according to the following criteria. ◯: The print pattern is uniformly printed. Δ: Some unevenness is recognized in the print pattern. X: Significant unevenness is recognized in the print pattern. Examples 1 to 5 Polyvinyl alcohol / allyl glycidyl ether copolymer (hereinafter, PVA / AGE copolymer A polyoxypropylene-α, ω-diamine (molecular weight 230) as a cross-linking agent is added at a ratio shown in Table 1 to an aqueous solution of 10% by weight of a PVA portion having a saponification degree of 80% and a polymerization degree of 500). A coating solution was prepared. On a 100 μm thick polyethylene terephthalate film (hereinafter referred to as PET film),
The coating liquid was applied using a coater bar, and then heated and dried at 100 ° C. for 3 minutes to form an ink absorption layer having a thickness of 10 μm. Example 6 A recording sheet was prepared in the same manner as in Example 2 except that the crosslinking agent was replaced with hexamethylenediamine.

Example 7 The same PVA / AGE copolymer as in Example 2 was used and coated on a PET film without adding a crosslinking agent to the coating solution,
A recording sheet was prepared by heating and drying at 120 ° C. for 10 minutes and crosslinking.

Comparative Example 1 Polyvinyl alcohol (polymerization degree: 500, saponification degree: 80)
%) 10 wt% aqueous solution with a coater bar to a thickness of 1
After coating on a PET film of 00 μm, it was dried at 100 ° C. for 3 minutes to form an ink absorbing layer having a thickness of 10 μm.

Comparative Example 2 The same PVA / AGE copolymer as in Example 2 was used and coated on a PET film without adding a crosslinking agent to the coating solution,
A recording sheet was produced by drying at 100 ° C. for 3 minutes.

Copolymer composition ratio of PVA / AGE copolymer,
Table 1 shows the addition amount of the crosslinking agent and the evaluation results of the recording sheets obtained in Examples 1 to 7 and Comparative Examples 1 and 2.

[0034]

[Table 1] Examples 8 to 12 Polyvinylpyrrolidone / allyl glycidyl ether copolymer (hereinafter referred to as PVP / AGE copolymer, weight average molecular weight 370000) 10% by weight aqueous solution, polyoxypropylene-α, ω-diamine (molecular weight as a crosslinking agent Two
30) was added at the ratio shown in Table 2 to prepare a coating solution.
A coating liquid was applied onto a PET film having a thickness of 100 μm using a coater bar, and then heat-dried at 100 ° C. for 3 minutes to form an ink absorbing layer having a thickness of 10 μm.

Example 13 A recording sheet was prepared in the same manner as in Example 9 except that the crosslinking agent was replaced with hexamethylenediamine.

Example 14 The same PVP / AGE copolymer as in Example 9 was used and coated on a PET film without adding a crosslinking agent to the coating solution,
A recording sheet was prepared by heating and drying at 120 ° C. for 10 minutes and crosslinking.

Comparative Example 3 Polyvinylpyrrolidone (PVP, weight average molecular weight 370
000) 10% by weight aqueous solution was coated on a PET film having a thickness of 100 μm with a coater bar, and then 100
An ink absorption layer having a thickness of 10 μm was formed by drying at 3 ° C. for 3 minutes.

Comparative Example 4 The same PVP / AGE copolymer as in Example 9 was used and coated on a PET film without adding a crosslinking agent to the coating solution,
A recording sheet was produced by drying at 100 ° C. for 3 minutes.

Copolymer composition ratio of PVP / AGE copolymer,
Amount of cross-linking agent added, and Examples 8 to 14 and Comparative Examples 3 and 4
Table 2 shows the evaluation results of the recording sheet obtained in.

[0040]

[Table 2] As is clear from Table 1 and Table 2, when the recording sheet of the example is used, the ink absorbency, water resistance, and print state are good. On the other hand, when the recording sheet of the comparative example is used, any one of the characteristics of ink absorbency, water resistance, and printed state is significantly deteriorated, and water resistance is particularly insufficient.

[0041]

In the recording sheet of the present invention, the ink absorbing layer is composed of a specific crosslinked material, and therefore the ink absorbing property and the water resistance are high. Further, it has good ink absorbency, water resistance, and printability, and is suitable for inkjet recording. Furthermore, an OHP sheet having a support made of a transparent sheet has a high level of transparency, ink absorption and water resistance in a well-balanced manner.

Claims (5)

[Claims] 1. An ink-absorbent sheet having an ink-absorbing layer on one or both sides of a support, wherein the ink-absorbing layer is composed of a cross-linked product of a water-absorbing polymer or water-soluble polymer containing an epoxy group. Inkjet recording sheet. 2. The water-absorbing polymer or water-soluble polymer containing an epoxy group is composed of at least one selected from polyvinyl alcohol, polyvinylpyrrolidone, poly (meth) acrylic acid or salts thereof. The inkjet recording sheet described above. 3. The ink jet recording sheet according to claim 1, wherein the water-absorbent polymer or the water-soluble polymer is crosslinked with a crosslinking agent. 4. The ink jet recording sheet according to claim 1, wherein the crosslinking agent is a polyoxyalkylene type diamine. 5. The ink jet recording sheet according to claim 1, wherein the water-absorbent polymer or water-soluble polymer is polyvinyl alcohol or polyvinylpyrrolidone containing 0.01 to 5 mol% of an epoxy group-containing monomer unit. .