JPH10258568A - Recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording sheet without fault such as printing unevenness or stain due to ink jet recording or lap feeding at the time of conveying a sheet with excellent antistatic property. SOLUTION: An ink jet ink receiving layer 2 is formed on a surface of a base material 3, and polymer antistatic agent made of sulfonated polyaniline is added into the ink layer, or the agent spray coats a surface of the receiving layer. Or, a primer layer is provided between the layer 2 and the material 3 and the agent is added into the primer layer to provide excellent antistatic performance, thereby obtaining the recording sheet having satisfactory perservability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a recording sheet for an ink jet printer, and more particularly to a novel recording sheet for an ink jet printer using an excellent antistatic agent made of a specific material.

[0002]

2. Description of the Related Art Conventionally, as an output print of a computer or a word processor, a wire dot recording system,
Various systems such as a heat-sensitive coloring recording system, a heat-sensitive melt transfer recording system, a heat-sensitive sublimation transfer recording system, an electrophotographic recording system, and an ink jet recording system have been put into practical use. Among them, the ink jet recording method has the features that plain paper can be used as recording paper, printing cost is low, the apparatus is compact, there is no noise, and high-speed recording is possible. For this reason, attention has been paid to the use as a printer for quickly and accurately outputting image information such as characters and figures produced by a computer or the like. Also, because it is easy to colorize and the picture is clear, there is a need to record image information produced by a computer on a transparent recording sheet with an ink jet printer and use this as a manuscript of OHP etc. at conferences, presentations at various conferences etc. Is also growing.

In general, an ink jet printer ejects recording ink from a nozzle by pressure of a fine piezoelectric element (piezo element) or air pressure (bubble jet) generated by heating a thermal head, and prints the recording ink on a recording sheet. Recording is carried out by attaching. For this reason, as a recording sheet used for ink jet recording, ink that is difficult to dry is used in order to prevent ejection of ink from nozzles due to an increase in viscosity due to drying of the ink. For this reason, this ink component is generally obtained by dissolving a dye, a resin, an additive, and the like in water and alcohol.

Therefore, a recording sheet for recording by an ink jet printer is required to absorb moisture of the attached ink and rapidly dry and solidify the ink, and a specific ink receiving layer is formed on a resin film or paper. A recording sheet with improved ink absorbency is used.
The ink receiving layer of the ink jet recording sheet is required to have the following characteristics. It is excellent in ink absorbency, fast drying property of ink, moderate dot spread is obtained, excellent imageability to obtain clear images without blur, etc., haze is not large and transparency is high, Excellent storage stability that does not cause printing deterioration or blocking after high-temperature and high-humidity storage, has curling resistance that does not cause curling in the use environment, does not cause adhesion of dust due to charging, and does not cause double feeding of sheets. , And so on. From such a viewpoint, a conventional recording sheet using a water-absorbing / water-soluble resin or the like as an ink receiving layer on a base material has been put to practical use.

[0005]

However, the ink receiving layer formed by applying a water-soluble resin such as polyvinyl alcohol or polyvinylpyrrolidone has a low antistatic property and has a sufficient antistatic property in a normal temperature to low humidity environment. Does not show sex. For this reason, there is a problem of adhesion of dust due to static electricity and a problem in conveyance such as double feeding during printing. In particular, the adhesion of dust leads to a decrease in the formed image quality and resolution, and causes a problem that an image quality that can be used practically cannot be obtained.

As a method for solving such a problem, it is known to form an antistatic layer on the back surface of a recording sheet. However, when the antistatic layer is formed of a surfactant or a conventional antistatic agent, the recording sheet may be sticky, or the ink may bleed, the haze may increase, or the printability may decrease. By the above ~
Characteristics are degraded. Further, there has been a problem that the antistatic effect is insufficient or the effect decreases with time. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a recording sheet that has printability, transparency, and storability and is excellent in antistatic properties.

[0007]

According to a first aspect of the present invention, there is provided an ink receiving layer mainly composed of a water-soluble resin or a water-absorbing resin on at least one surface of a support. A recording sheet comprising a sulfonated polyaniline as an antistatic agent in the ink receiving layer. Since such a recording sheet is used, there is little occurrence of trouble due to charging during recording by an ink jet printer.

[0008] A second aspect of the present invention to solve the above-mentioned problem is to provide a recording sheet provided with an ink receiving layer mainly composed of a water-soluble resin or a water-absorbing resin on at least one surface of a support. A recording sheet comprising a sulfonated polyaniline as an antistatic agent on the surface of the ink receiving layer. Since such a recording sheet is used, there is little occurrence of trouble due to charging during recording by an ink jet printer.

A third aspect of the present invention for solving the above-mentioned problems is that a primer layer is provided on at least one surface of the support.
A recording sheet provided with an ink-receiving layer mainly composed of a water-soluble resin or a water-absorbing resin, wherein the primer layer contains a sulfonated polyaniline as an antistatic agent. Since such a recording sheet is used, there is little occurrence of trouble due to charging during recording by an ink jet printer.

[0010]

FIG. 1 is a sectional view showing one embodiment of a recording sheet of the present invention. In FIG. 1, a recording sheet 1 of the present invention includes a base material 3 and an ink receiving layer 2 on one surface of the base material 3 on which an image can be formed. Ink receiving layer 2
Alternatively, the surface thereof contains sulfonated polyaniline as an antistatic agent. On the opposite side of the substrate 3 from the ink receiving layer 2, an anti-curl / anti-static layer 5, which also serves as anti-curl and anti-static, is provided if necessary. The anti-curl / antistatic layer 5 is an optional layer, which may contain sulfonated polyaniline. FIG. 2 is a sectional view showing another embodiment of the recording sheet of the present invention. In FIG. 2, the recording sheet 1 of the present invention includes a base material 3 and an ink receiving layer 2 on one surface of the base material 3 on which an image can be formed via a primer layer 4. The primer layer 4 contains sulfonated polyaniline as an antistatic agent.

(Antistatic Agent) Sulfonated polyaniline is an antistatic agent composed of an electronically conductive polymer. Recording sheets using such an antistatic agent are found in conventional ionic antistatic agents. It exhibits sufficient antistatic performance even in a low humidity environment without being affected by such environmental humidity. In addition, because it is a polymer antistatic agent, almost no bleed-out or show-through as seen with conventional low-molecular-weight antistatic agents is observed, excellent printability and transparency,
Has preservability.

As the sulfonated polyaniline used as an antistatic agent, various ones are known. One example is a sulfonated polyaniline represented by the following structure.

[Formula 1] (In the above formula, x, y and n have a molecular weight of about 30.
It is a value that becomes 0 to 10,000. )

The above-mentioned sulfonated polyaniline is soluble in a solvent containing water or alkaline water, and dissolves by forming an internal salt or an alkaline salt. These sulfonated polyanilines may be used, for example, under the trade name of "Aqua-SAVE-01Z" from Nitto Chemical Industry Co., Ltd., and as an aqueous solution or a mixed solvent solution of water and an organic solvent. Can be. These solutions are yellowish solutions, but are almost colorless at low concentrations.

As a method for applying the antistatic agent to the ink receiving layer, mixing with the resin of the ink receiving layer, overcoating or spraying the ink receiving layer can be mentioned. The overcoating or spraying is preferably carried out after diluting to about 1 to 30% with a single solvent or a mixed solvent of water, alcohol and other organic solvents. In mixing with the ink receiving layer resin, it is preferable to mix about 0.1 to 20% with respect to the resin component. Particularly preferably, about 1 to 10% is mixed. If the amount of the antistatic agent is small, the antistatic effect is not exhibited, and if it is too large, coloring becomes strong and transparency is impaired. It is also preferable to mix the same when it is contained in the primer layer. In the case of mixing with the ink receiving layer resin, the application of the ink receiving layer is performed in two or three times, and the antistatic agent is contained only in the surface layer by adding the sulfonated polyaniline only to the last coating layer. Can be made.

When the sulfonated polyaniline is contained on the ink receiving layer, as described above, water or alcohol or another organic solvent may be used alone or in a mixed solvent.
After diluting to about 30%, there is a method of spraying by a top coat method or a spray method.
The solid content of the sulfonated polyaniline after drying was 0.1%.
About 01 to 1.0 g / m ² is preferable.

Hereinafter, the structure of each part of the recording sheet of the present invention will be sequentially described. (Substrate) As the substrate 3 used in the recording sheet of the present invention, when the recording sheet 1 is used for, for example, an OHP sheet or a backlight film, transparency, heat resistance, and dimensional stability are used. Preferably, it is a thermoplastic having rigidity. Specifically, a thickness of about 5 to 250 μm of polyethylene terephthalate resin, polycarbonate resin, acrylic resin, polyvinyl chloride resin, polypropylene resin, polystyrene resin, polyvinyl alcohol resin, polyethylene resin, diacetate resin, triacetate resin, polyimide resin, etc. , Preferably 5
Examples thereof include a film or a sheet having a thickness of about 0 to 180 μm.

If the transparent substrate 3 has insufficient adhesion to the ink receiving layer formed on its surface, it is preferable to apply a primer treatment or a corona discharge treatment to its surface. When a primer layer is provided, antistatic properties can be measured by including a sulfonated polyaniline in the primer layer. Further, an anti-curl / antistatic layer 5 may be provided on the back surface of the substrate 3 on which the ink receiving layer is not formed.

When the use of the recording sheet 1 is not limited to an OHP sheet such as dedicated paper, glossy paper, and label paper, the recording sheet 1 does not need to be transparent. , High quality paper, art paper, coated paper, cast coated paper, wallpaper, backing paper, synthetic resin impregnated paper, emulsion resin impregnated paper, synthetic rubber latex impregnated paper, synthetic resin internal paper, paperboard, white plastic film, foam film, etc. Various colored or white papers can also be used.

(Ink Receiving Layer) The ink receiving layer 2 is a receiving layer of an ink jet ink, and therefore is mainly composed of a mixture of a water-soluble resin, an aqueous water-absorbing resin, and a water-soluble resin having wet heat resistance and low-temperature printability. It is characterized by:
The water-soluble resin used in the present invention is soluble in water or a mixed solution of water and alcohol, and various conventionally known resins can be used. For example, polyvinyl alcohol, polyvinyl chloridone, poly (meth) acrylic acid, cellulose resin (carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, etc.), polyacrylamide, polyethylene oxide, polyethylene glycol, polyvinyl acetal resin, polyvinyl methyl ether, Polyamine, polyethylene imine,
Water-soluble resins such as casein, gelatin, starch and / or
Alternatively, at least one or more of these copolymers, cations, anion-modified products and the like are used.

It is particularly preferred that the mixture is a combination of a water-absorbing polyester resin, polyvinyl alcohol and polyvinyl pyrrolidone. Aqueous water-absorbent resin is a water-soluble resin that is cross-linked to make it water-absorbent and water-insoluble, and is obtained by coating a water-soluble resin partially cross-linked or grafted. After coating, there is a cross-linking agent or a cross-linked by heating or ionizing radiation. Other examples include copolymers of a hydrophilic monomer and a hydrophobic monomer, such as a water-absorbing alkyd resin, a polyester resin, a polyvinyl acetate resin, a polyvinyl chloride copolymer resin, an NBR resin, an SBR resin, and a polyurethane. Resin, acrylic resin, polyamide resin, etc. alone or as a mixture,
It is used as a copolymer or a modified product. The modified product is, for example, a product obtained by copolymerizing or grafting a monomer or oligomer containing a hydroxyl group, a carboxylic acid, a sulfonic acid, a quaternary ammonium salt, or the like to increase the hydrophilicity. Above all, the water-absorbing polyester resin is particularly preferable because it has high adhesiveness to the substrate, high film strength, and scars of the print roller marks on the printed portion during transport of the printer, that is, high wet strength.

The water-soluble resin having wet heat resistance and low-temperature printability is a resin that is soluble in water, alcohol or a mixed solvent thereof, and is used in various environments (temperature range: -20 to 50 ° C., humidity range: 10 to 10). (90% RH) is preferable. In particular, those which hardly deteriorate in water absorbency and printability before and after storage under high temperature and high humidity. In addition, those having good printability in each environment, particularly those having almost no decrease in water absorbency and printability in a low temperature environment, and various conventionally known ones are used. For example, polyvinylpyrrolidone, poly (meth) acrylic acid, cellulosic resins (methylcellulose, hydroxypropylmethylcellulose,
Water-soluble resins such as hydroxypropylethylcellulose), polyethylene oxide and polyethylene glycol and / or copolymers thereof, specifically, at least one kind of modified cation / anion such as polyvinylpyrrolidone-vinyl acetate copolymer and the like. The above is used. Above all, polyvinylpyrrolidone or hydroxypropylmethylcellulose is particularly preferable because it has excellent ink absorbency, printability in a low-temperature and low-humidity environment, and printability after storage in a high-temperature and high-humidity environment.

The ratio of [aqueous water-absorbing resin] to [the sum of the water-soluble resin and the water-soluble resin having wet heat resistance and low-temperature printability] is between 7: 3 and 1: 9, and When,
The ratio of the water-soluble resin having wet heat resistance and low-temperature printing property is used in the range of 1: 9 to 9: 1, particularly preferably the former is 5: 5 to 2: 8, and the latter is 2: 1. 8 to 4 to 6
Range. If the above range is not met, a record that has a good balance of ink drying properties, image clarity, printability in high-temperature, high-humidity and low-temperature, low-humidity environments, and printability after storage in high-temperature, high-humidity environments Sheets cannot be obtained.

For the purpose of improving blocking resistance, coating strength and adhesion, various aqueous polymers such as alkyd resins, polyester resins, polyvinyl acetate resins, polyvinyl acetate copolymer resins, NBR resin, SB
An R resin, a polyurethane resin, an acrylic resin, a polyamide, or the like is used alone or as a mixture, a copolymer, or a modified product. In particular, organic particles having a primary particle diameter of 5 to 80 μm and secondary particle diameters of 5 to 2
It is effective to add 0 μm inorganic particles in the range of 0.1 to 10% based on the resin component. If the amount is less than this range, a sufficient effect for preventing blocking cannot be obtained. On the other hand, if the amount is more than this range, the transparency of the ink receiving layer decreases, which is not preferable. In addition, additives, inorganic compounds, and the like that enhance dye fixing properties can be added. In addition, various surfactants, antioxidants, ultraviolet absorbers, antifoaming agents, various types of highly hydrophilic modified oils, and the like can be mixed and used as long as the effects of the present invention are not impaired.

The ink-receiving layer of the composition described above may be formed by various known methods, for example, gravure coat, gravure reverse coat, roll coat, wire bar coat, blade coat, knife coat, air knife coat. , Comma coat, slot die coat, dip coat, and the like. The thickness applied to the substrate using these methods is 0.1 to 50 when dry.
μm, preferably 3 to 30 μm. If the thickness is less than 0.1 μm, the ink absorption is not sufficient, and if it exceeds 50 μm, economic disadvantages increase, that is, the manufacturing cost increases, which is not preferable. In addition, in order to secure the coating amount, the liquid having the same composition may be coated plural times.

(Primer layer) The above-mentioned primer layer 4
Is formed mainly of a binder having good adhesiveness to both the substrate and the ink receiving layer, and a sulfonated polyaniline which is an electron conductive polymer as an antistatic agent. As the binder, for example, polyester resin, polyurethane resin, polyacrylic resin, polyvinyl formal resin, epoxy resin, polyvinyl butyral resin, polyamide resin, polyether resin, polystyrene resin, styrene- Acrylic copolymer resins and the like can be mentioned. Among them, a water-soluble or water-dispersible polyester resin having a carboxyl group is used for adhesion to a substrate, compatibility with a sulfonated polyaniline, adhesion to a heat-resistant lubricating layer, and the like. Particularly preferred in terms of,
For example, it can be obtained from Nippon Synthetic Chemical Industry Co., Ltd. under the trade name of "Polyester WR-961" and used in the present invention.

The primer layer in the present invention is formed mainly of the above-mentioned binder and the above-mentioned sulfonated polyaniline, and is formed by a solvent containing water, for example, water and an aqueous solution of methanol, ethanol, isopropyl alcohol, normal propyl alcohol and the like. A coating liquid is prepared by dissolving the binder and the sulfonated polyaniline in a mixture with a neutral organic solvent. An optional additive such as a surfactant for improving the wettability of the base sheet during coating and an antifoaming agent for suppressing bubbles can be added to the coating liquid. In particular, a phosphate ester-based surfactant is preferably used as the surfactant.

The composition of the coating liquid for the primer layer is about 2 to 10% by weight, preferably 4 to 4.7% by weight of the binder resin.
5% by weight, sulfonated polyaniline (solid content) about 0.1
Preferred is a composition comprising 〜5% by weight, preferably 0.25 / 1% by weight, about 0-2% by weight of surfactant, preferably 0.2-1% by weight and the balance of solvent. For the formation of the primer layer, the coating liquid is applied to one surface of the base sheet, for example,
It is formed by coating and drying by a conventional coating method such as a gravure coater, a roll coater, and a wire bar.

The coating amount is about 0.02 as a solid content of the coating liquid.
１．０1.0 g / m ² , preferably about 0.07-0.2 g / m ²
in the range of m ^2, the coating amount is less than the above range, an insufficient performance as a primer layer and antistatic layer, whereas, even coating amount exceeds the above range, in proportion to its thickness As a result, the above-described performance is not improved, which is economically disadvantageous.

In order to improve the adhesion of the primer layer and the strength of the coating film, the above resin may be cross-linked with various curing agents, for example, epoxy resin, melamine resin, isocyanate and the like. The method for forming the above-mentioned primer layer,
A method similar to the above-described method for forming the ink receiving layer can be selected.
The thickness of the primer layer is 0.1 to 10 μm when dried,
Preferably, the thickness is 0.2 to 5 μm. If the thickness is less than 0.1 μm, sufficient performance in adhesiveness is not exhibited, while if it exceeds 10 μm, the end face becomes sticky when the recording sheet is cut, which leads to high production costs. Is not preferred.

(Anti-Curl / Antistatic Layer) The same ink-receiving layer as the anti-curl / antistatic layer 5 may be provided on the surface (back surface) of the substrate opposite to the surface on which the ink-receiving layer is formed. good. For the purpose of curling prevention, it is possible to use the same water-soluble resin as the ink receiving layer on the surface, an acrylic resin, a polyester resin, and the like, and in particular, use an acrylic resin or a modified acrylic resin or a polyester resin. It is also useful in terms of imparting anti-blocking properties and slip properties. The thickness of the curl prevention layer is preferably about 0.1 to 50 μm when dried, and a method similar to the above-described method for forming the ink receiving layer can be selected.

Further, in order to prevent the recording sheet from being contaminated by dust and to ensure the stability of conveyance by a printer, an antistatic layer containing the following antistatic agent can be provided.
As the antistatic agent, sulfonated polyaniline can be used, and any conventionally known cation, anion, amphoteric ion, or nonionic antistatic agent can be used. Examples thereof include cationic antistatic agents such as quaternary ammonium salts and polyamine derivatives, anionic antistatic agents such as alkyl phosphates, and nonionic antistatic agents such as fatty acid esters. The antistatic layer may be added with the above antistatic agent and a lubricant such as an organic or inorganic filler, and a compounded solution obtained by dissolving or dispersing them in a solvent, according to a known method, that is, gravure coating, gravure reverse coating. It is formed by applying and drying by a method such as roll coating. The thickness of the antistatic layer is about 0.001 to 0.1 μm when dried.

[0032]

(Ink receiving layer composition)

 Polyvinyl alcohol (solid content 10%, water / IPA = 2/1) 100 parts (Kuraray Co., Ltd. “PVA217” polymerization degree 1700, saponification degree 88 mol%) Sulfonated polyaniline (solid content 10% aqueous solution) 5 parts (solid) (Nitto Chemical Industry Co., Ltd. “AQUA-SAVE-01Z”)

Example 2 As a substrate, a thickness of 100 μm
Polyethylene terephthalate film (manufactured by Toray Industries, Inc. "Lumirror Q80D"), below, an ink-receiving layer composition as dry coating amount of the 6 g / m ^2, was applied by bar coating (wire bar # 50) Method After drying, the same ink-receiving layer composition as in Example 1 was coated with a bar coat (miya bar # 3) such that the dry coating amount was 4 g / m ^2.
0) Method was applied. After the application, drying was performed at 80 ° C. for 5 minutes to form an inkjet ink receiving layer. [Ink receiving layer composition] Polyvinyl alcohol (solid content 10%, water / IPA = 2/1) 100 parts (Kuraray Co., Ltd. "PVA217" polymerization degree 1700, saponification degree 88 mol%)

Example 3 As a substrate, a thickness of 100 μm
Polyethylene terephthalate film (manufactured by Toray Industries, Inc. "Lumirror Q80D"), below, an ink-receiving layer composition as dry coating amount of the 10 g / m ^2, was applied by bar coating (wire bar # 30) Method Dried. [Ink receiving layer composition] Polyvinyl alcohol (solid content 10%, water / IPA = 2/1) 100 parts (Kuraray Co., Ltd. "PVA217" polymerization degree 1700, saponification degree 88 mol%) Then, the following antistatic agent The solution was applied by a bar coating method (Miyabar # 3). Next, drying with a dryer was performed. The coating amount was so small that it could not be measured. [Antistatic agent solution] Sulfonated polyaniline (10% solid content aqueous solution) 3 parts (solid content) (Nitto Chemical Industry Co., Ltd. “AQUA-SAVE-01Z”) Phosphate ester surfactant (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) "Plysurf 217E") 1.0 part Water 44.0 parts Isopropyl alcohol 50.0 parts

Example 4 As a substrate, a thickness of 100 μm
The following primer layer composition was dried on a polyethylene terephthalate film (“Lumirror Q80D” manufactured by Toray Industries, Inc.) to a thickness of 0.5 μm when dried (a coating amount of 0.5 g / m 2).
² ) Apply by bar coating (Miyabar No.5) method so as to become, then dry with warm air and primer layer (antistatic layer)
Was formed. [Composition for primer layer] Sulfonated polyaniline (solid content 10% aqueous solution) 1 part (solid content) (Nitto Chemical Industry Co., Ltd. "AQUA-SAVE-01Z") Water-soluble polyester resin (solid content 30% by weight) 4 parts (Solid content) (Polyester WR-961 manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) Phosphate ester surfactant ("Plysurf 217E" manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 1.0 part Water 44.0 parts Isopropyl alcohol 50.0 parts

The following ink-receiving layer composition was applied on the primer layer by a bar coating method (Miyabar # 30) so that the coating amount of the ink-receiving layer composition when dried was 10 g / m ² . After application, drying is performed at 80 ° C for 5 minutes.
An inkjet ink receiving layer was formed. [Ink receiving layer composition] 100 parts of polyvinyl alcohol (solid content 10%, water / IPA = 2/1) (Kuraray Co., Ltd. "PVA217" polymerization degree 1700, saponification degree 88 mol%) sulfonated polyaniline (solid content 10 5% (solid content) (Nitto Chemical Industry Co., Ltd. “AQUA-SAVE-01Z”)

(Comparative Example 1) As a substrate, a thickness of 100 μm
Polyethylene terephthalate film (manufactured by Toray Industries, Inc. "Lumirror Q80D"), below, as an ink-receiving layer composition dry coating amount of the 10 g / m ^2, was coated by a bar coating (wire bar # 30) Method. 80 ° after application
C, drying was performed under the conditions of 5 minutes to form an inkjet ink receiving layer. [Ink receiving layer composition] Polyvinyl alcohol (solid content 10%, water / IPA = 2/1) 100 parts (Kuraray Co., Ltd. “PVA217” polymerization degree 1700, saponification degree 88 mol%) Antistatic agent (Matsumoto Yushi Co., Ltd.) Company "F Coal 70") 5 parts (solid content)

(Comparative Example 2) As a substrate, a thickness of 100 μm
The following primer layer composition was dried on a polyethylene terephthalate film (“Lumirror Q80D” manufactured by Toray Industries, Inc.) to a thickness of 0.5 μm when dried (a coating amount of 0.5 g / m 2).
² ) The composition was applied by a bar coating method (miya bar # 5) and dried with warm air to form a primer layer (antistatic layer). [Composition for Primer Layer] Antistatic agent (Matsumoto Yushi Co., Ltd. “Efcol 70”) 5 parts (solid content) Water-soluble polyester resin (solid content 30% by weight) 4.75 parts (solid content) (Nippon Synthetic Chemical Industry "Polyester WR-961" manufactured by Co., Ltd. Phosphate ester surfactant ("Plysurf 217E" manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 0.2 parts Water 44.8 parts Isopropyl alcohol 50.0 parts

On the primer layer, the following ink-receiving layer composition was applied by a bar coating method (Miyabar # 30) so that the coating amount of the ink-receiving layer composition after drying was 10 g / m ² . After application, drying is performed at 80 ° C for 5 minutes.
An inkjet ink receiving layer was formed. [Ink receiving layer composition] Polyvinyl alcohol (solid content 10%, water / IPA = 2/1) 100 parts (Kuraray Co., Ltd. "PVA217" polymerization degree 1700, saponification degree 88 mol%)

The above Examples 1 to 4 and Comparative Examples 1 to 2
The surface electrical resistance of the recording sheet obtained in the above was measured in a low humidity environment, and the results of the measured values in Table 1 were obtained. Further, each performance of the transparency and the storage stability was evaluated, and the results shown in Table 1 were obtained. In addition, the evaluation method of each performance is as follows. (1) Antistatic Property The surface electrical resistance (Ω) of the ink-receiving layer formed by coating was measured in an environment at room temperature of 20 ° C. and humidity of 30% RH. In addition, "R12704 R" manufactured by Advantest
efficiency Chamber "and" R8
340A Ultra Resistance Met
er "was used. (2) Transparency The haze value of the sheet was measured. The measurement was performed using "Color & Color Me" manufactured by Nippon Denshoku Industries Co., Ltd.
ter Model 1001DP "was used. (3) Storage properties In a high-temperature and high-humidity environment at room temperature of 40 ° C. and humidity of 90% RH, recording sheets are laminated and stored (48 hours, load: about 100 hours).
g / A4 size), and the printability of the ink jet recording immediately after the elapse of the storage time was evaluated. Evaluation contents ：: The uniformity of the solid print recording portion is good, and no bleeding is observed at the boundary of the print portion. ×: There is unevenness in the solid print recording portion, and bleeding is seen at the boundary of the print portion.

[0041]

[Table 1]

[0042]

The recording sheet of the present invention has excellent antistatic properties because it contains a conductive polymer, sulfonated polyaniline, in the ink receiving layer or in the primer layer below the ink receiving layer. No printing unevenness or bleeding or double feeding during sheet conveyance occurs. In particular, sulfonated polyaniline has no temperature dependency in its antistatic properties, has high transparency, and has a sufficient effect even when added in a small amount, so that even if it is used to form an antistatic layer in the ink receiving layer, As with the conventional antistatic agent, it has excellent performance in that the recording sheet does not stick or the antistatic agent does not bleed out or show-through on the sheet surface when the recording sheet is wound in a roll. Demonstrate.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of a recording sheet of the present invention.

FIG. 2 is a cross-sectional view illustrating another embodiment of the recording sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording sheet 2 Ink receiving layer 3 Substrate 4 Primer layer 5 Curling prevention / antistatic layer

Claims (5)

[Claims] 1. A recording sheet in which an ink receiving layer mainly composed of a water-soluble resin or a water-absorbing resin is provided on at least one surface of a support, wherein the ink receiving layer contains a sulfonated polyaniline as an antistatic agent. A recording sheet characterized by having been made. 2. The recording sheet according to claim 1, wherein an antistatic agent is contained in a surface layer of the ink receiving layer. 3. A recording sheet in which an ink receiving layer mainly composed of a water-soluble resin or a water-absorbing resin is provided on at least one surface of a support, wherein the surface of the ink receiving layer contains sulfonated polyaniline as an antistatic agent. A recording sheet characterized by having been made. 4. A recording sheet in which a primer layer and an ink receiving layer mainly composed of a water-soluble resin or a water-absorbing resin are sequentially provided on at least one surface of a support, wherein the primer layer has a sulfonated polyaniline as an antistatic agent. A recording sheet characterized by containing: 5. The recording sheet according to claim 4, wherein the primer layer contains a polyester resin as a binder.