JPH11192778A - Recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording sheet having good ink absorbing property, character printability and image quality and excellent water resistance and moisture resistance. SOLUTION: In the recording sheet comprising an ink receptive layer at least on one side surface of a base material, the receptive layer contains a water soluble or water dispersible polyester resin, and a cationic polymer resin. The polyester resin is preferably a copolymer of a hydrophilic radical polymerizable vinyl monomer or a copolymer of a hydrophilic radical vinyl monomer and other copolymerizable vinyl monomer. And, the polymer resin preferably has a carboxylic acid group, or a quaternary ammonium base, a carboxylic acid group and an ether group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording sheet used for an electrophotographic copying machine, an ink jet printer, a thermal transfer printer and the like. More specifically, particularly in ink jet recording, the ink absorbability is excellent, good color recording is possible, the image density is high,
The present invention relates to a recording sheet having a clear image color tone, good color developability (gloss), and excellent water resistance and moisture resistance.

[0002]

2. Description of the Related Art With the spread of office automation in recent years, there has been an increasing demand for creating and recording documents in offices, and there has been a demand for a printer with low noise and excellent image quality. Electrophotographic copying machines, inkjet printers, and thermal transfer printers have been put to practical use to satisfy these requirements.
In recent years, color copying technology has reached the stage of completion, and color copiers / printers are gradually spreading. Above all, the spread of inkjet printers is remarkable. Ink jet printers use ink that is difficult to dry in order to prevent clogging of nozzles, and the components of this ink generally include a binder, a dye, a solvent, and additives dissolved in water. Therefore, it is necessary to use a recording sheet having good water absorbency, and special paper having good ink absorbency is usually used.

Conventionally, various recording sheets have been proposed.

For example, Japanese Patent Application Laid-Open No. 52-53012 discloses a recording sheet in which base paper is impregnated with a paint for surface treatment. JP-A-53-49113 discloses a recording sheet in which a sheet containing a urea-formalin resin powder is impregnated with a water-soluble polymer. JP 55
JP-A-146786 discloses an example in which a water-soluble polymer is applied.

[0005] However, the conventional recording sheet has high ink absorbency, but has disadvantages such as a large dot diameter, easy to blur around the dots, and a large dimensional change of the paper after recording.

[0006]

Generally, paper is water-resistant,
Since the film is inferior in moisture resistance and the like, if a plastic film not having these drawbacks can be applied, the advantages can be utilized in various fields.

When a sheet having low ink absorbency is used in recording by an ink jet printer, the ink may be insufficiently dried or may not be dried at all. If the finger is rubbed or overlapped, the recording portion becomes dirty. Is virtually unusable. In order to improve these points, in order to improve the ink absorption of the substrate, for example, polyvinyl alcohol, starch, gelatin, cellulose derivatives such as hydroxyethylcellulose and methylcellulose, polyacrylic acid, polymethacrylic acid and salts thereof and the like It has been proposed to provide a water-soluble polymer recording layer (for example, JP-A-61-59239, JP-B-27941, JP-B-2-3479).
No. 2). However, even if the conventional recording layer satisfies the ink absorbency, the water resistance is poor, the recording layer or the recording portion is dissolved in water, and the recorded image disappears, or the recorded image becomes sticky. Bleeding or blocking when sheets are laminated.

An object of the present invention is to solve the above-mentioned problems and to provide a recording sheet which is excellent in ink absorbency and excellent in water resistance, moisture resistance, and color development (luster).

[0009]

According to the present invention, there is provided a recording sheet comprising a substrate having an ink receiving layer provided on at least one side of a substrate, wherein the ink receiving layer is water-soluble or water-dispersible. And a cationic polymer resin.

[0010]

Hereinafter, the recording sheet of the present invention will be described in more detail.

The base recording sheet of the present invention is provided with an ink receiving layer on at least one side, and the ink receiving layer comprises a water-soluble or water-dispersible polyester resin and a cationic polymer resin. It contains.

The ink-receiving layer contains both a water-soluble or water-dispersible polyester resin and a cationic polymer resin. Is undesirably reduced. Further, when a cationic polymer resin is not contained, the water resistance is undesirably reduced. In the present invention,
Preferably, the polyester resin and a cationic polymer resin are used as main components to form an ink receiving layer, and by containing these resins, a synergistic effect of improving ink dyeing properties and moisture resistance is provided. Has also been obtained.

In the recording sheet of the present invention, as the substrate, paper, cloth, synthetic paper, plastic film, paper / plastic film, cloth / plastic film, etc. can be used. Among them, a plastic film is preferable from the viewpoint of water resistance and moisture resistance.

Examples of the material of the plastic film include polyester, polyolefin, polyamide, polyesteramide, polyether, polyimide, polyamideimide, polystyrene, polycarbonate, poly-ρ-phenylene sulfide, polyetherester, polyvinyl chloride and poly (meth). Acrylic esters are preferred. Further, these copolymers, blends, and further cross-linked ones can also be used.

Further, among the above plastic films, polyesters such as polyethylene terephthalate, polyethylene 2,6-naphthalate, polyethylene α, β-bis (2-chlorophenoxy) ethane 4,4 ′
-Dicarboxylate, polybutylene terephthalate and the like are preferable, and among these, in consideration of mechanical properties, quality such as workability, economical efficiency, etc., polyethylene terephthalate and polyethylene 2,6-naphthalate are more preferable. preferable.

The polyester in the present invention is, for example, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, bis-α, β (2-chlorophenoxy) ethane 4,4′-dicarboxylic acid, adipic acid, Polyester obtained by polycondensing at least one kind of bifunctional carboxylic acid such as sebacic acid and at least one kind of glycol such as ethylene glycol, triethylene glycol, tetramethylene glycol, hexamethylene glycol, and decamethylene glycol. . In addition, the polyester may be blended or copolymerized with various kinds of polymers as long as the effects of the present invention are not impaired, or further may be an antioxidant, a heat stabilizer, a lubricant, a pigment, An ultraviolet absorber or the like may be included. The intrinsic viscosity (measured in orthochlorophenol at 25 ° C.) of the polyester is usually 0.4 to 2.0, preferably 0.5 to 1.
It is good to be in the range of 0.

In the present invention, a white base material may be used as the base material. For example, the above-mentioned polyester film used for the base material may be whitened by including white inorganic particles in polyester. It can also be used.

The white inorganic particles are inorganic particles that are almost uncolored, and include calcium carbonate, amorphous zeolite particles, anatase type titanium dioxide, calcium phosphate, calcium sulfate, barium sulfate, silica, alumina, kaolin,
Talc, clay and the like can be used. In addition to such inorganic particles, fine particles precipitated by a reaction between a catalyst residue and a phosphorus compound in a polyester polymerization reaction system can also be used.

Further, a film which contains fine bubbles inside the film and which is whitened by scattering light with the bubbles can also be used. The formation of such fine bubbles can be caused by incompatible polymers, such as poly-3-methylbutene-1, poly-4-methylpentene-1, polypropylene, polyvinyl-t-butane, in a film matrix, such as polyester. Finely disperse 1,4-trans-poly-2,3-dimethylbutadiene, cellulose triacetate, cellulose tripropionate, polychlorotrifluoroethylene, or the like, or add the above-described whitening fine particles to form a uniaxial or It is formed by biaxially stretching. This is because, upon stretching, voids (bubbles) are formed around the immiscible polymer particles, which exhibit a light scattering action and are whitened.
In addition, such a film is preferable because it has fine bubbles and therefore has a low specific gravity and also has a cushioning property, so that a clear image can be obtained.

When such a bubble-containing polyester film is used, the apparent specific gravity of the bubble-containing polyester film is preferably 0.4 or more and 1.3 or less, and more preferably 0.6 or more and 1.2 or less. If the apparent specific gravity is lower than the above range, mechanical properties and thermal dimensional stability are inferior, which is not preferable.

When the polyester film is a film which has been subjected to an appropriate surface treatment, for example, a corona discharge treatment (in air, nitrogen, carbon dioxide gas, etc.) or an easy adhesion treatment, the polyester film has good adhesion to the recording layer, It is preferably used because water resistance and solvent resistance are improved. Various methods can be used for the easy adhesion treatment, and acrylic, urethane, and polyester adhesives are applied in the film manufacturing process, or the film after uniaxial or biaxial stretching is applied as described above. Those to which various adhesives are applied can be suitably used.

The base film may be a transparent film or a colored film.

The thickness of the substrate is not particularly limited, but is usually 10 μm or more and 500 μm or less, preferably 20 μm or more and 300 μm or less, more preferably 30 μm or more and 250 μm or less.
It is desirable that it is not more than μm.

The substrate may be constituted by a single material, but is preferably constituted as a laminate. For example, a laminated structure of paper / plastic film,
In the case of a laminated structure of cloth / plastic film, the texture is also preferable, and the plastic film can be made thin, which is advantageous in terms of cost and is therefore preferable.

The water-soluble or water-dispersible polyester resin used in the present invention is preferably such that the polyester resin is a copolymer with a hydrophilic radically polymerizable vinyl monomer, or a hydrophilic radically polymerizable vinyl monomer and other polyesters. Is a copolymer with a copolymerizable vinyl monomer.
In particular, in the case of a copolymer with a hydrophilic radically polymerizable vinyl monomer, the water absorption of the ink is preferably improved, and the copolymer with a hydrophilic radically polymerizable vinyl monomer and another copolymerizable vinyl monomer is preferable. Copolymers are preferred because the water resistance is further improved.

The water-soluble or water-dispersible polyester resin used in the present invention is produced, for example, by subjecting a dicarboxylic acid and a diol to esterification (ester exchange) and polycondensation by a conventionally known production technique. Although it is obtained, its manufacturing method is not particularly limited.

The dicarboxylic acid component is preferably mainly composed of an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid or naphthalene dicarboxylic acid or an ester thereof, but is preferably an aliphatic dicarboxylic acid such as adipic acid, succinic acid or sebacic acid. Hydroxycarboxylic acids such as dicarboxylic acid, hydroxybenzoic acid or esters thereof can also be used as the dicarboxylic acid component or as a part thereof.

On the other hand, as the diol component, ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, cyclohexanedimethanol, bisphenols and the like are used.

Further, in the present invention, in order to impart water solubility, a component having a hydrophilic group, for example, a dicarboxylic acid component such as 5-sodium sulfoisophthalic acid and a diol component such as diethylene glycol, triethylene glycol and polyethylene glycol are used. Copolymerized. It is also preferable to copolymerize a cationic monomer such as a quaternary ammonium salt of aminoalkyl acrylate or aminoalkyl methacrylate in order to improve the dyeing properties of the ink.

In the present invention, hydrophilic radically polymerizable vinyl monomers that can be preferably used include hydroxyethyl acrylate, hydroxyethyl methacrylate,
Hydroxyacrylates such as hydroxypropyl acrylate and hydroxypropyl methacrylate, ethylene glycol acrylate, ethylene glycol methacrylate, polyethylene glycol acrylate, glycol esters such as polyethylene glycol methacrylate, and further acrylamide compounds, glycidyl acrylate compounds, vinyl pyridine, Examples thereof include nitrogen-containing vinyl compounds such as vinylimidazole and vinylpyrrolidone, unsaturated acids such as acrylic acid, methacrylic acid, maleic anhydride, itaconic acid and crotonic acid, and salts thereof.

Other copolymerizable vinyl monomers that can be used in the present invention include vinyl esters such as vinyl acetate, vinyl halides such as vinyl chloride, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, and the like. Examples thereof include unsaturated carboxylic esters such as ethyl methacrylate and butyl methacrylate, vinyl silanes such as dimethylvinylmethoxysilane, and olefins such as ethylene, propylene, styrene and butadiene, and diolefin compounds.

Examples of the hydrophilic radically polymerizable vinyl monomer which can be used in the present invention include hydroxyacrylates such as hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, ethylene glycol acrylate, and ethylene glycol acrylate. Glycol methacrylate,
Polyethylene glycol acrylate, glycol esters such as polyethylene glycol methacrylate, furthermore, acrylamide compounds, glycidyl acrylate compounds, vinylpyridine, vinylimidazole, nitrogen-containing vinyl compounds such as vinylpyrrolidone, acrylic acid,
Unsaturated acids such as methacrylic acid, maleic anhydride, itaconic acid, crotonic acid and salts thereof.

Other copolymerizable vinyl monomers usable in the present invention include vinyl esters such as vinyl acetate, vinyl halides such as vinyl chloride, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, and the like. Examples include unsaturated carboxylic esters such as ethyl methacrylate and butyl methacrylate, vinyl silanes such as dimethylvinylmethoxysilane, olefins such as ethylene, propylene, styrene, and butadiene, and diolefin compounds.

The cationic polymer resin which can be preferably used in the present invention is preferably a resin having a carboxylic acid group, more preferably a resin having a quaternary ammonium base, a carboxylic acid group and an ether group. is there. For example, a copolymer of these with styrene or an acrylic acid ester can be used.
In the case of those having a carboxylic acid group, the adhesion to a substrate, especially a polyester film is improved, which is preferable. Further, a quaternary ammonium base, a carboxylic acid group,
And those having an ether group are preferable because the ink dyeing property and the water resistance of the receptor layer are improved. Specific examples having a carboxylic acid group include, for example,
Acrylic acid can be used. As a specific example having an ether group, for example, methoxyethyl methacrylate can be used.

Specific examples of the cationic monomer represented by a quaternary ammonium salt include, for example, (meth) acryloyloxytrimethylammonium chloride,
(Meth) acrylic-based monomers such as (meth) acryloyloxyhydroxypropyltrimethylammonium chloride, (meth) acryloyloxytriethylammonium chloride, (meth) acryloyloxydimethylbenzylammonium chloride and (meth) acryloyloxytrimethylammonium methylsulfate Mers,
(Meth) acrylamide-based cationic monomers such as (meth) acrylamidopropyltrimethylammonium chloride and (meth) acrylamidopropyldimethylbenzylammonium chloride can be used.

The acrylate-based ester referred to herein means acrylate and methacrylate, and is preferably a fatty alcohol ester.
For example, methyl acrylate, ethyl acrylate, butyl acrylate, propyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, propyl methacrylate, 2-hydroxylethyl methacrylate, 2-hydroxylethyl acrylate, or the like can be used.

In the present invention, in order to improve the water resistance of the ink receiving layer, at least one of a curing agent selected from melamine, epoxy, isocyanate, oxazoline compound, zirconium compound and the like is used in the ink receiving layer. Is preferable, and among them, a zirconium-based curing agent is more preferable in terms of water resistance, stability of a coating solution, and the like.

Further, in the present invention, it is preferable to use a fluorine-based surfactant in order to improve the leveling property of the ink receiving layer and the dyeing property of the ink. Examples of the fluorine surfactant include a perfluoroalkyl sulfonate, a perfluoroalkyl carboxylate, a perfluoroalkyl ethylene oxide adduct, a perfluoroalkyl trimethylammonium salt, a perfluoroalkyl amino sulfonate and the like containing a perfluoroalkyl group. A fluorine-based surfactant or the like can be used, but is not limited thereto. Among them, a perfluoroalkylethylene oxide adduct is preferable because of its excellent solubility in various solvents, low foaming property, surface tension lowering ability and the like.

In the ink receiving layer of the present invention, another hydrophilic resin can be mixed if necessary. As the hydrophilic resin, ethylene-vinyl acetate copolymer resin, ionomer resin, urethane resin, nylon resin, ethylene-acrylic acid copolymer resin, ethylene-ethyl acrylate copolymer resin, ethylene-methyl acrylate copolymer resin, ethylene -A methacrylic acid copolymer resin, an ethylene-vinyl alcohol copolymer resin, a polyvinyl alcohol resin, a polyvinyl butyral resin, a polystyrene resin, a polyalkylene oxide resin, a polyvinyl pyrrolidone resin, gelatin and the like can be used, but are not limited thereto.

Although the coating thickness of the ink receiving layer is not particularly limited, it is 1 to 50 μm, preferably 2 to 30 μm.
If it is thinner, the ink absorbency of the obtained recording layer is inferior,
If it is thicker than this, the workability deteriorates and blocking tends to occur, which is not preferable.

In the present invention, when used as a recording sheet, it is preferable to impart an antistatic function from the viewpoint of adhesion of dust and the like due to static electricity and running properties. In order to impart antistatic properties, it is desirable to provide a receiving layer on one side of the substrate and provide an antistatic layer on the other side, or add an antistatic agent to the receiving layer.

The antistatic layer in the present invention includes a coating layer made of an antistatic agent, a resin layer containing an antistatic agent, and a vapor-deposited layer made of a metal or a metal oxide. Agent, conductive polymer, conductive carbon fine particles,
Fine particles of metal or metal oxide can be used.

In the present invention, in order to improve the running property and heavy running property of the recording sheet, an antistatic agent is applied to the surface of the substrate opposite to the receiving layer, or a coating material containing inorganic or organic fine particles is applied. May be.

In the present invention, inorganic and / or organic particles may be dispersed in the receiving layer or the antistatic layer in order to further enhance the recording characteristics. As the inorganic particles, for example, silica, clay, talc, diatomaceous earth, calcium carbonate, barium sulfate, aluminum silicate, synthetic zeolite, alumina, zinc oxide, mica and the like can be used. As the organic particles, for example, polymethyl methacrylate, polystyrene, copolymers thereof, polyvinyl chloride, polyethylene, polypropylene, polyvinylidene chloride, plastic pigments such as polycarbonate can be preferably used, but are not limited thereto is not.

In the recording sheet according to the present invention,
Various additives within a range that does not impair the effects of the present invention, for example, a silicone-based leveling agent, an antifoaming agent, a thickener, an antistatic agent, an antioxidant, an ultraviolet inhibitor, a fluorescent brightener, a dye, and the like. May be included.

The method for applying the recording layer is not particularly limited.
Gravure coating, reverse coating, kiss coating,
Methods such as a die coating method and a bar coating method can be used. At this time, not only the coatability is improved by applying a surface treatment such as a corona discharge treatment or a primer treatment in the air or other atmosphere as necessary before coating on the film, The receiving layer can be more firmly formed on the film. In addition, the coating agent concentration,
The conditions for drying the coating film are not particularly limited, but the drying conditions for the coating film are desirably performed within a range that does not adversely affect the properties of the substrate.

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a method for evaluating various characteristics according to the present invention will be described.

(1) Inkjet recording properties: Using an inkjet printer PM700C manufactured by Epson Corporation, solid images and photographic images were inkjet-recorded, and image quality and ink absorbability were evaluated. Recording properties were determined as follows. . The image quality was evaluated by visual observation using a magnifying glass, and the ink absorptivity was evaluated based on the degree of contamination of the recording layer with ink when the recorded portion was rubbed once with a finger immediately after recording.

Image quality: A: Very good (dots are uniform and clear).

○: good

Δ: slightly inferior

X: There are dot flow, repelling, bleeding, and the like.

Ink absorption: ：: very good (recording layer is not stained at all)

○: good

Δ: Slightly inferior.

×: The ink is removed and the recording layer is stained.

(2) Water resistance of recorded image: The recording sheet on which ink jet recording was performed was immersed in water for 1 minute, and the degree of image flow was evaluated.

：: The image does not flow at all.

Δ: The image slightly flows.

×: Image flows.

(3) Moisture resistance of recorded image: A recording sheet on which ink-jet recording was performed was allowed to stand in an atmosphere of 40 ° C./80% RH for one day, and the degree of image bleeding was evaluated.

A: The image does not blur at all.

Δ: The image is slightly blurred.

×: Image blurred.

(4) Specific gravity: The film is 100 × 100 m
Cut into m-square, dial gauge (No.
09-10), a probe with a diameter of 10 mm (No. 700)
Measure the thickness of at least 10 points with 2) attached,
The average thickness d (μm) is calculated. The film is weighed by a direct balance and the weight w (g) is read to the unit of 10 ^-4 g. At this time, the specific gravity was set to w / d × 100.

Next, the present invention will be described in detail with reference to examples, but is not limited thereto.

Example 1 A homopolymer chip of polyethylene terephthalate produced by a conventional method (intrinsic viscosity: 0.62, melting point: 25)
9 [deg.] C.) to obtain a biaxially stretched polyester film having a thickness of 100 [mu] m and a specific gravity of 1.4 by a conventional method. Corona discharge treatment was performed on the polyester film thus obtained. Next, as a receiving layer on the corona discharge treated surface, a polyester resin obtained by copolymerizing a hydrophilic radically polymerizable vinyl monomer (manufactured by Takamatsu Yushi Co., Ltd., NS141L)
X), a quaternary ammonium salt, a cationic acrylic resin having a carboxylic acid and an ether group (Dulima SPO-602, manufactured by Nippon Pure Chemical Co., Ltd.) and a zirconium-based curing agent (Daiichii Kagaku Kagaku Kogyo, Zircosol) ZC-2) was dissolved in a water / methanol = 2/1 solvent so that the solid content ratio was 100/100/2, and the solid content was 17%.
Was applied by a reverse coater so that the thickness after drying became 10 μm, and dried at 120 ° C. for 1 minute to obtain a recording sheet of the present invention.

The recording characteristics of the recording sheet thus obtained were as shown in Table 1, and the recording sheet was excellent in recording properties and excellent in water resistance and moisture resistance. Further, when projected by an overhead projector, the image was clear and good as a sheet for an overhead projector.

Example 2 In Example 1, as the receiving layer, a polyester resin (NS141LX, manufactured by Takamatsu Yushi Co., Ltd.) copolymerized with a hydrophilic radically polymerizable vinyl monomer and a quaternary ammonium salt, a carboxylic acid and an ether group were used. Having a cationic acrylic resin (manufactured by Nippon Junyaku Co., Ltd., Julimer SPO-6)
02), polyvinylpyrrolidone (Rubiscol K-90, manufactured by BASF) and a zirconium-based curing agent (Zircosol ZC-2, Daiichi Kagaku Kagaku Kogyo Co., Ltd.) in a solid content ratio of 100/100/50/2. Was dissolved in a water / methanol = 2/1 solvent and coated as a solution having a solid content of 15% to obtain a recording sheet of the present invention in the same manner.

The recording properties of the recording sheet thus obtained were as shown in Table 1, and the recording sheet was excellent, and had excellent water resistance and moisture resistance. Further, when projected by an overhead projector, the image was clear and good as a sheet for an overhead projector.

Example 3 Polyethylene Terephthalate Chip and Molecular Weight 40
The master chip to which the polyethylene glycol of No. 00 was added at the time of polymerization of polyethylene terephthalate was vacuum-dried at 180 ° C., and then mixed so as to be 89% by weight of polyethylene terephthalate, 1% by weight of polyethylene glycol, and 10% by weight of polymethylpentene. 300
Feed to extruder B heated to ° C. Further, after drying polyethylene terephthalate containing 10% by weight of calcium carbonate having an average particle diameter of 1.0 μm as described above,
Feed to extruder A. The polymers extruded from the extruders A and B were laminated so as to have a three-layer configuration of A / B / A, and formed into a sheet from a T die.

Further, the unstretched film obtained by cooling and solidifying this film with a cooling drum having a surface temperature of 25 ° C. was heated to 85 to 95 ° C.
And stretched 3.4 times in the longitudinal direction, and cooled by a roll group at 25 ° C.

Subsequently, the longitudinally stretched film was guided to a tenter while holding both ends of the film with clips, and stretched 3.6 times in a direction perpendicular to the longitudinal direction in an atmosphere heated to 130 ° C. Thereafter, heat fixing at 230 ° C. was performed in a tenter, and after uniform cooling, the film was cooled to room temperature and wound up to obtain a white film having a thickness of 100 μm and a specific gravity of 1.0. The laminated structure of the film was 5/90/5 μm. A recording sheet was obtained in the same manner as in Example 2 as a receptor layer on the polyester film obtained by the above method. The recording characteristics of the recording sheet thus obtained are as shown in Table 1, and the recording properties are good.
The water resistance and moisture resistance were also excellent.

Example 4 In Example 1, a polyester resin (manufactured by Takamatsu Yushi Co., Ltd., NS141LX) obtained by copolymerizing a hydrophilic radically polymerizable vinyl monomer with a quaternary ammonium salt, a carboxylic acid and an ether group was used as the receiving layer. Having a cationic acrylic resin (Jurimer SPO-6 manufactured by Nippon Pure Chemical Co., Ltd.)
02), polyvinylpyrrolidone (manufactured by BASF, Rubiscol K-90), a fluorine-based surfactant (manufactured by Dainippon Ink and Chemicals, Inc., Megafac F-142D), and a zirconium-based curing agent (Daiichi Kagaku Kagaku Kogyo) Co., Ltd., Zircosol ZC-2) in a solid content ratio of 100/100/50
The recording sheet of the present invention was obtained in the same manner except that the recording sheet was dissolved in a water / methanol = 2/1 solvent so that the ratio became 1/2, and the solution was applied as a solution having a solid content of 15%.

The recording characteristics of the recording sheet thus obtained were as shown in Table 1, and the recording sheet was excellent, and had excellent water resistance and moisture resistance. Further, when projected by an overhead projector, the image was clear and good as a sheet for an overhead projector.

Comparative Example 1 A recording sheet was obtained in the same manner as in Example 1 except that the receiving layer did not contain a polyester resin (NS141LX, manufactured by Takamatsu Oil & Fats Co., Ltd.) copolymerized with a hydrophilic radically polymerizable vinyl monomer. Was. The recording characteristics of the recording sheet thus obtained were as shown in Table 1 and were inferior in image quality and ink absorption. Comparative Example 2 In Example 1, as the receiving layer, a cationic acrylic resin having a quaternary ammonium salt, a carboxylic acid and an ether group (manufactured by Nippon Pure Chemical Co., Ltd., Julima-SPO-6)
02) was obtained in the same manner except that the recording sheet was not included.
The recording characteristics of the recording sheet thus obtained were as shown in Table 1 and were inferior in image quality and ink absorption.

[0077]

[Table 1]

[0078]

The recording sheet of the present invention has excellent ink absorbency, printability, image quality, water resistance and moisture resistance, and is particularly preferably used as a recording sheet for a color ink jet printer. Further, it can be preferably used in electrophotographic copying machines, fabric ink receivers, carbon ink receivers, heat-sensitive ink receivers including sublimation types, and applications such as offset printing and flexographic printing.

Claims (15)

[Claims] 1. A recording sheet having an ink receiving layer provided on at least one surface of a substrate, wherein the ink receiving layer contains a water-soluble or water-dispersible polyester resin and a cationic polymer resin. Recording sheet to be. 2. The recording sheet according to claim 1, wherein the polyester resin is a copolymer with a hydrophilic radically polymerizable vinyl monomer. 3. The recording sheet according to claim 1, wherein the polyester resin is a copolymer of a hydrophilic radically polymerizable vinyl monomer and another copolymerizable vinyl monomer. 4. The recording sheet according to claim 1, wherein the cationic polymer resin has a carboxylic acid group. 5. The recording sheet according to claim 1, wherein the cationic polymer resin has a quaternary ammonium base, a carboxylic acid group and an ether group. 6. The ink receiving layer according to claim 1, wherein the ink receiving layer contains at least one selected from melamine, epoxy, isocyanate, oxazoline, and zirconium-based curing agents. Record sheet. 7. The recording sheet according to claim 1, wherein the ink receiving layer contains a fluorinated surfactant. 8. The recording sheet according to claim 7, wherein the fluorosurfactant is a perfluoroalkylethylene oxide adduct. 9. The recording sheet according to claim 1, wherein the substrate is a polyester film. 10. The recording sheet according to claim 1, wherein the substrate is a white polyester film. 11. The recording sheet according to claim 1, wherein the base material is a white polyester film having an apparent specific gravity of 0.4 or more and 1.3 or less. 12. The recording sheet according to claim 1, wherein the substrate is a polyethylene terephthalate or polyethylene 2,6-naphthalate film. 13. The recording sheet according to claim 1, wherein the base material is a laminated structure of paper / plastic film. 14. The recording sheet according to claim 1, wherein the substrate is a laminated structure of cloth / plastic film. 15. The recording sheet according to claim 1, wherein the recording sheet is an ink jet recording sheet.