JP7124791B2 - Coated paper and its manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a coated paper capable of suppressing reflection of blue light and a method for producing the same.

In recent years, health problems caused by blue light (blue light) have become a problem. Blue light refers to high-energy light with a short wavelength of 380 to 500 nm among visible rays, and is often emitted from lighting devices using blue LEDs. It is said that if the naked eye is exposed to blue light for a long time when reading printed materials such as books using a lighting device, it may cause eyestrain, dry eyes, sleep disorders, stiff shoulders, headaches, etc. there is

A number of prior arts have already been disclosed for paper that is easy on the eyes and causes little eye strain. For example, Patent Literature 1 discloses paper containing at least waste paper and having whiteness within a specific numerical range, and a ^{* and b* values} in L ^* a ^* b ^* color difference notation. Based on the results of a visual fatigue measurement test conducted by a plurality of subjects, the hue and whiteness are specified so that the user's eyes will not get tired even after long-term use.

Further, in Patent Document 2, a coating for printing having two coating layers, an undercoat coating layer mainly composed of a pigment and an adhesive, and a top coating layer, on at least one surface of a base material A craft paper is disclosed. The coating agent for the coated paper contains, as a pigment, recycled pigment agglomerates made mainly from deinked froth. The white paper glossiness of this coated paper is 30 to 50%, the difference between the white paper glossiness and the printing glossiness is 30% or more, and the image clarity value measured by an image clarity tester is 10 to 35%.

Japanese Patent No. 3896762 Japanese Patent No. 4027957

The invention described in Patent Document 1 specifies the whiteness and hue of the paper, but does not specify the type or content of the dye or pigment. There was a possibility that it would be difficult to resolve. Further, the invention described in Patent Document 2 has two coating layers, an undercoat coating layer and a top coating layer. In addition, the deinked floss is used as the main raw material, and recycled pigment aggregates manufactured through many processes are used as pigments for coating agents, and there is room for improvement in terms of productivity and manufacturing costs. rice field.

The present invention has been made in view of the above situation. That is, an object of the present invention is to provide a coated paper capable of suppressing reflection of blue light and reducing eye fatigue, and a method for producing the same.

The inventor of the present invention conducted extensive studies to solve the above problems. As a result, it was found that by incorporating a specific organic compound having a maximum absorption peak in the wavelength region of blue light into the coated paper, blue light reflection from the coated paper can be suppressed and the above problems can be solved. I have perfected my invention. The present invention has the following configuration.

(1) A coated paper having a coating layer containing a pigment and a binder resin on at least one side of the base paper, and containing at least one organic compound having a maximum absorption peak in the visible light region with a wavelength of 380 to 500 nm. A coated paper characterized by:

(2) The coated paper according to (1), wherein the coating layer contains the organic compound.

(3) The coated paper according to (1) or (2) above, wherein the coated surface of the coating layer has a degree of whiteness of 70 to 80%.

(4) The coated paper according to any one of (1) to (3) above, wherein the coated surface of the coating layer has an a ^* value of 0 to -5.0.

(5) The coated paper according to any one of (1) to (4) above, wherein the b ^* value of the coated surface of the coating layer is 1.0 to 10.0.

(6) The coated paper according to any one of (1) to (5), wherein the organic compound is at least one selected from tetracene derivatives, porphyrin derivatives, carotene derivatives and fucoxanthin derivatives.

(7) Any one of (1) to (6) above, wherein the organic compound is a tetracene derivative, and the tetracene derivative is contained in a proportion of 0.01 to 2% by mass relative to the solid content of the coating layer. Coated paper according to the paragraph.

(8) The coated paper according to any one of (1) to (7) above, wherein the coating amount of the coating layer is 2 to 20 g/m ² per side as a solid content.

(9) The coated paper according to any one of (1) to (8) above, wherein the proportion of calcium carbonate in the pigment is 60 to 100% by mass.

(10) The coated paper according to any one of (1) to (9) above, wherein the binder resin is a styrene-butadiene resin.

(11) The coated paper according to any one of (1) to (10) above, wherein the coating layer is applied to at least one side of the base paper using a blade coater or a rod blade coater. manufacturing method.

The coated paper of the present invention can suppress blue light reflection and reduce eye fatigue. Moreover, the coated paper manufacturing method of this invention can manufacture the said coated paper.

EMBODIMENT OF THE INVENTION Below, embodiment of this invention is described, giving a specific example of embodiment. However, embodiments of the present invention are not limited only to the following embodiments.

[Coated paper]
The coated paper of this embodiment has a coating layer on at least one side of the base paper. The coated paper of the present embodiment can be used as printing paper by printing on the coating layer side. The printing method is not particularly limited and may be offset printing, letterpress printing, flexographic printing, gravure printing, screen printing, inkjet printing, or the like.

(Base paper)
The base paper preferably contains wood pulp as a main component. Here, "mainly composed of wood pulp" means that 50% by mass or more of wood pulp is contained as a material constituting the base paper. The pulp constituting the base paper is not particularly limited as long as it is wood pulp, and wood pulp that is usually used for papermaking can be used. Wood pulp includes, for example, hardwood kraft pulp (LBKP), softwood kraft pulp (NBKP), hardwood sulfite pulp (LBSP), chemical pulp such as softwood sulfite pulp (NBSP), stone ground pulp (GP), pressurized Unbleached, semi-bleached or bleached pulp such as stone ground pulp (PGW), refiner ground pulp (RGP), chemi ground pulp (CGP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), sulfite pulp, Deinked waste paper pulp (DIP) and the like can be mentioned.

The pulp of the base paper preferably contains hardwood kraft pulp and softwood kraft pulp. Since hardwood kraft pulp is excellent in formation and dimensional stability, it is preferably contained in a large amount. On the other hand, since softwood kraft pulp has thick and long fibers, the inclusion of softwood kraft pulp increases the tensile strength and makes the paper less likely to tear. However, a large amount of softwood kraft pulp is not preferable because it causes feathering and lowers fine line reproducibility. Therefore, the mass ratio of hardwood kraft pulp to softwood kraft pulp is preferably 98:2 to 60:40, more preferably 95:5 to 70:30.

Canadian standard pulp freeness (freeness, beating degree) measured according to JIS P 8121:1995 of base paper pulp should be 400 to 600 ml from the viewpoint of strength of base paper, prevention of ink strike-through during printing, etc. is preferred, and 520-580 ml is more preferred. When the volume is 400 ml or more, the pulp fibers are less likely to be crushed, so that the thickness of the base paper does not decrease, and the occurrence of ink strike-through during printing can be effectively suppressed. On the other hand, when it is 600 ml or less, the strength of the base paper can be improved. Various known methods are used for adjusting the freeness of the pulp of the base paper.

(filler)
Fillers are preferably added to the base paper. By adding filler to the base paper, the printing ink can be fixed in the base paper. The type of filler is not particularly limited. Examples of fillers include calcium carbonate, talc, white carbon, titanium dioxide, kaolin, calcium sulfite, gypsum, amorphous silica, diatomaceous earth, magnesium carbonate, aluminum oxide, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, water. Zinc oxide and the like can be mentioned. In addition, fillers contained in waste paper, waste paper, etc. can be reused. The filler content is preferably 7 to 30% by mass, more preferably 13 to 20% by mass, relative to the base paper.

(Sizing agent)
It is preferable to add a sizing agent to the base paper. By adding a sizing agent to the base paper, the strike-through of the printing ink can be suppressed. The method of adding the sizing agent may be an internal addition method or an external addition method. Examples of sizing agents include rosin-based, alkylketene dimer-based, alkenyl succinic anhydride-based, styrene-acrylic, higher fatty acid-based, and petroleum resin-based sizing agents. The content of the sizing agent is preferably 0.01 to 0.20% by mass, more preferably 0.05 to 0.10% by mass, relative to the base paper.

The base paper may further contain other additives. Other additives include fixing agents such as aluminum sulfate, cationic starch, and cationic polymer electrolytes, paper strength agents such as polyacrylamide polymers and starch, melamine resins, urea resins, and the like. Wet strength agents, yield improvers, pH adjusters and the like can be mentioned.

(Coating layer)
The coated paper of this embodiment has a coating layer containing a pigment and a binder resin on at least one side of the base paper.

(pigment)
Pigments such as calcium carbonate, talc, and white carbon are added to the coating layer. These pigments are added for the purpose of improving ink absorbability, preventing ink strike-through, etc., and are distinguished from so-called color pigments. Among these pigments, calcium carbonate is preferable because it is excellent in both offset printability and white paper glossiness. The proportion of calcium carbonate in the pigment is preferably 60-100% by mass, more preferably 70-90% by mass.

Other types of pigments may be added as pigments, if desired. Other types of pigments include, for example, titanium dioxide, kaolin, calcium sulfite, gypsum, amorphous silica, diatomaceous earth, magnesium carbonate, aluminum oxide, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, and the like. mentioned.

The total content of pigments is preferably 30 to 95% by mass, more preferably 50 to 80% by mass, based on the solid content of the coating layer.

(binder resin)
A binder resin is used to form a coating layer on the base paper. The binder resin is not particularly limited as long as it is used for the coating layer for paper. Examples of binder resins include water-soluble celluloses, natural water-soluble polymer derivatives, water-soluble polymers, and aqueous resin dispersions (latex). Here, water-soluble celluloses include carboxymethyl cellulose, methyl cellulose, hydroxyalkyl cellulose and the like. Natural water-soluble polymer derivatives include alginic acid, guar gum, xanthan gum, pullulan, and casein. Water-soluble polymers include starch, starch derivatives, polyvinyl alcohol, cationized polyvinyl alcohol, polyacrylamide, and the like. Starch derivatives include alkyl-modified starch, cationized starch, oxidized starch, etherified starch, esterified starch, and the like. Examples of the resin for the aqueous resin dispersion include styrene-butadiene-based resin, ethylene-vinyl acetate-based resin, acrylonitrile-butadiene-based resin, polyurethane-based resin, vinyl acetate-based resin, and the like. Among these, an aqueous resin dispersion (latex) of a styrene-butadiene-based resin is preferable from the viewpoint of good suitability for offset printing and good coating layer strength. When a styrene-butadiene-based resin is used as the binder resin, the content of the styrene-butadiene-based resin is preferably 7 to 26% by mass with respect to 100% by mass of the pigment.

The content of the binder resin is preferably 4 to 25% by mass, more preferably 10 to 25% by mass, even more preferably 10 to 15% by mass, based on the solid content of the coating layer. . By setting the content of the binder resin within the above range, it is possible to suppress a decrease in surface strength and prevent the occurrence of rubbing stains on the printed portion.

(blue light)
Blue light (blue light) refers to high-energy light with a wavelength of 380 to 500 nm among visible rays. Long-term exposure of the naked eye to blue light may cause eye strain, dry eye, sleep disturbance, shoulder stiffness, headache, etc., and has become a health problem in recent years.

(organic compound)
In order to suppress the reflection of blue light from the coated paper, the present inventors investigated incorporating an organic compound having an absorption peak in the visible light region with a wavelength of 380 to 500 nm into the coated paper. In particular, an organic compound having a maximum absorption peak in the visible light region with a wavelength of 380 to 500 nm (hereinafter sometimes simply referred to as "organic compound") was investigated.

By including an organic compound in the coated paper, visible light including blue light is absorbed, so that the reflection of blue light out of the visible light emitted from lighting devices, etc., is suppressed, thereby reducing eye fatigue. becomes possible. Coated paper may contain at least one organic compound.

Methods of incorporating an organic compound into coated paper include a method of incorporating an organic compound into a coating layer and a method of incorporating an organic compound into a base paper. The method of incorporating an organic compound into the coating layer is preferable because the efficiency of allowing the organic compound to absorb blue light is greater.

Organic compounds such as tetracene derivatives, porphyrin derivatives, carotene derivatives and fucoxanthin derivatives are known as organic compounds. The organic compound is preferably at least one selected from these derivatives. These are commercially available as dyes and pigments.

Specific examples of tetracene derivatives include rubrene, 2,8-di-tert-butyl-5,11-bis(4-tert-butylphenyl)-6,12-diphenyltetracene (abbreviation: TBRb), 5,12 -bis(1,1'-biphenyl-4-yl)-6,11-diphenyltetracene (abbreviation: BPT), N,N,N',N'-tetrakis(4-methylphenyl)tetracene-5,11- diamine (abbreviation: p-mPhTD), tetracene and the like. Specific examples of porphyrin derivatives include porphyrin derivatives, tetraphenylporphyrin derivatives, tetrabenzoporphyrin derivatives and the like. Specific examples of carotene derivatives include α-carotene, β-carotene, lycopene and the like.

Among these organic compounds, tetracene derivatives and porphyrin derivatives are preferred, and tetracene derivatives are more preferred, from the viewpoint of blue light wavelength absorption. These organic compounds can be used individually by 1 type or in combination of 2 or more types.

The content of the organic compound in the coating layer depends on the type of organic compound, but is usually preferably 0.01 to 2% by mass, more preferably 0.1 to 2% by mass, based on the solid content of the coating layer. Preferably, 1 to 2% by mass is more preferable.

The coating amount of the coating layer is preferably 2 to 20 g/m ² per side, more preferably 3 to 10 g/m ² as a solid content, from the viewpoint of coatability and productivity of the coating layer. preferable. The thickness of the coating layer is preferably 5-40 μm, more preferably 10-20 μm.

The coating layer is colored by containing an organic compound having a maximum absorption peak in the visible light region with a wavelength of 380 to 500 nm. In addition, it is preferable that the printed material such as a book is colored using a dye or a pigment so as to reduce eye fatigue when reading the printed material for a long time. From such a point of view, the whiteness, a ^* value and b ^* value of the coated surface of the coating layer are defined as follows.

The whiteness of the coating surface of the coating layer is preferably 70 to 80%, more preferably 75 to 80%. Here, the whiteness is the ISO whiteness (diffuse blue light reflectance) specified in JIS P 8148 (ISO 2470).

The a ^* value of the coated surface of the coating layer is preferably from 0 to -5.0, more preferably from -2.0 to -3.5. Here, the a ^* value is a numerical value in the chromaticity diagram (CIELAB coordinates) of the L ^* a ^* b ^* color system, and is measured according to JIS Z 8781-4:2013.

The b ^* value on the coated surface of the coating layer is preferably 1.0 to 10.0, more preferably 1.5 to 3.0, and 1.5 to 2.5. More preferred. Here, the b ^* value is a numerical value in the chromaticity diagram (CIELAB coordinates) of the L ^* a ^* b ^* color system, and is measured according to JIS Z 8781-4:2013.

[Method for producing coated paper]
(Manufacturing method of base paper)
The base paper can be obtained by conventionally making paper using various paper machines to form a wet paper and then drying the wet paper. An organic compound is added as necessary during papermaking. After that, it is manufactured through a conventional treatment process such as a surface size press treatment and a smoothing treatment using a calendar or the like.

The paper machine includes, for example, a Fourdrinier paper machine having an air cushion headbox or hydraulic headbox, a twin wire paper machine, an on-top twin wire paper machine, a Yankee paper machine, and the like.

(Coating solution for coating layer)
The coating liquid for the coating layer is prepared by appropriately adding the above-mentioned organic compound and various auxiliary agents to the pigment and the binder resin, if necessary. Various auxiliary agents include dispersants, thickeners, water retention agents, antifoaming agents, cationic resins, sizing agents, viscosity modifiers, glossing agents, waxes, stabilizers, antistatic agents, cross-linking agents, UV Examples include absorbents, plasticizers, lubricants, and the like. Water is usually used as the solvent for the coating liquid.

As a method of applying the coating liquid for forming the coating layer, a generally known coating apparatus can be used. Examples of coating equipment include methods using blade coaters, rod blade coaters, air knife coaters, roll coaters, bar coaters, gravure coaters, micro gravure coaters, lip coaters, die coaters, curtain coaters, printers, and the like. can be done. Among these, the coating method using a blade coater or a rod blade coater is preferable from the viewpoint of the smoothness of the coating layer surface.

The present embodiment will be described more specifically by the following examples. In the following description, "parts" means "mass parts" and "%" means "mass%".

Raw materials used in Examples and Comparative Examples are as follows.
Cationic starch: Ace K-100 manufactured by Oji Cornstar Co., Ltd.
Alkenyl succinic anhydride-based neutral sizing agent: Size Pine SA-864 manufactured by Arakawa Chemical Industries, Ltd.
Oxidized starch: Ace A manufactured by Oji Corn Starch Co., Ltd.
Dispersant: Aron A-9 manufactured by Toagosei Co., Ltd.
Calcium carbonate: TP123CS manufactured by Okutama Industry Co., Ltd.
Kaolin: manufactured by Engelhard, Milagros Styrene-butadiene copolymer latex: manufactured by JSR, OJ-3000H
Starch: Oji Corn Starch Co., Ltd. Tetracene derivative: Kanto Chemical Co., Ltd. Tetracene, 909B4037, maximum absorption peak wavelength 477 nm
Violet dye: Kayafect Violet BC Liquid Blue, manufactured by Nippon Kayaku Co., Ltd. Coloring pigment: TB520 Blue 2B, manufactured by Dainichiseika Co., Ltd.
Yellow coloring pigment: TB910 Yellow FR manufactured by Dainichi Seika Co., Ltd.

(Example 1)
<Creating the base paper>
20% by mass of light calcium carbonate is added to a slurry of 100% by mass of bleached hardwood kraft pulp (freeness 400 ml CSF), 1% by mass of cationized starch, and 0.2% by mass of an alkenylsuccinic anhydride-based neutral sizing agent. It was added and thoroughly mixed to obtain a papermaking raw material. After that, the paper was dried to 10% water content using a fourdrinier multi-cylinder paper machine, and 4 g/m ² of a 7% by mass solution of oxidized starch was applied to both sides by a size press. Then, it was dried to a moisture content of 7% to prepare a base paper having a basis weight of 50 g/m ² .

<Preparation of aqueous coating solution A for coating layer>
A pigment slurry was prepared by adding 50% by mass of calcium carbonate and 50% by mass of kaolin to an aqueous solution containing 0.2% by mass of a dispersant and dispersing the mixture with a Colles disperser. 15% by mass of styrene-butadiene-based copolymer latex, 10% by mass of starch, and 1% by mass of tetracene derivative were added as binder resins to this pigment, and a water-based coating solution A for a coating layer having a solid content concentration of 65% by mass was prepared. got The addition of 1% by mass of the tetracene derivative means that it is added so as to be 1% by mass with respect to the solid content of the coating layer.

<Preparation of coated paper>
A base paper with a basis weight of 50 g/m ² was coated on both sides with a blade coater with the aqueous coating solution A for the coating layer so that the dry mass (solid content) on one side was 5 g/m ² , and dried. After that, supercalendering was performed to obtain a coated paper having a basis weight of 70 g/m ² .

(Example 2)
In the preparation of the aqueous coating solution A for the coating layer of Example 1, the procedure of Example 1 was repeated except that 1% by mass of the tetracene derivative was changed to 2% by mass to prepare the aqueous coating solution B for the coating layer. A coated paper was prepared by

(Example 3)
In the preparation of the aqueous coating solution A for the coating layer of Example 1, the aqueous coating solution C for the coating layer was prepared by changing 1% by mass of the tetracene derivative to 0.5% by mass to prepare the aqueous coating solution C for the coating layer. A coated paper was prepared in the same manner.

(Example 4)
In the preparation of the aqueous coating solution A for the coating layer of Example 1, the aqueous coating solution D for the coating layer was prepared by changing 1% by mass of the tetracene derivative to 0.01% by mass to prepare the aqueous coating solution D for the coating layer. A coated paper was prepared in the same manner.

(Comparative example 1)
Coated paper was prepared in the same manner as in Example 1, except that in the preparation of the aqueous coating solution A for the coating layer of Example 1, the aqueous coating solution F for the coating layer was not added with 1% by mass of the tetracene derivative. made.

(Comparative example 2)
In the preparation of the aqueous coating solution A for the coating layer of Example 1, 10% by mass of starch was changed to 70% by mass, and 1% by mass of tetracene derivative was changed to 0.0015% by mass of violet dye and 0.0030% by mass of blue coloring pigment. A coated paper was prepared in the same manner as in Example 1, except that the water-based coating solution G for the coating layer was used.

(Comparative Example 3)
In the preparation of the aqueous coating solution A for the coating layer of Example 1, except that 1% by mass of the tetracene derivative was changed to 0.1% by mass of the yellow coloring pigment to prepare the aqueous coating solution H for the coating layer was carried out. A coated paper was prepared in the same manner as in Example 1.

Various properties of the coated papers obtained in the above Examples and Comparative Examples were measured and evaluated by the methods described below. The results are shown in Table 1.

<Blank paper gloss on coated surface>
The coated surface of the coated paper was measured according to JIS P 8142:2005. Gloss meter: GM-26D manufactured by Murakami Color Research Institute
The white glossiness was judged to be preferably 30 to 50%.

<Whiteness of coated surface>
Measurement was performed based on JIS P 8148:2005 (ISO 2470).
Measuring device: Reflectometer manufactured by Suga Test Co., Ltd., product number SC-10WP

<a ^* value and b ^* value on coated surface>
The a ^* value and b ^* value in the L ^* a ^* b ^* color system defined in JIS Z 8781-4:2013 were measured.
Measuring device: spectrophotometer manufactured by Suga Test Co., Ltd., product number SC-10WP, light source: D65

<Blue light reduction rate evaluation)>
Using a spectrophotometer (V-770) manufactured by JASCO Corporation, the transmittance spectrum is measured in the wavelength range of 250 nm to 800 nm, the transmittance at a wavelength of 380 nm is read, and the blue light cut reduction rate is calculated from the comparison with the base paper. did. Furthermore, evaluation was made according to the following criteria.
(Evaluation criteria)
◎: 25% or more ○: 15% or more and less than 25% △: 5% or more and less than 15% ×: less than 5%

<Level of eye fatigue (sensory evaluation)>
After printing on coated paper and having 20 male and 20 female subjects (total 40 subjects) read for 10 minutes, they were asked to answer the degree of eye fatigue in the following 5 grades.
5: Easy to read 4: Slightly easy to read 3: Normal 2: Slightly tiring 1: Very tiring The average value of the responses from 40 people was evaluated in 4 stages based on the following criteria.
(Evaluation criteria)
◎: 4.5 or more ○: 4.3 or more and less than 4.5 △: 3.8 or more and less than 4.3 ×: less than 3.8

In Table 1, the coated papers of Examples 1 to 3 were excellent in white paper glossiness, whiteness and color tone of the coated surface, and had excellent performance in blue light reduction rate and eye fatigue. The coated paper of Example 4 had a slightly lower content of organic compounds, so the b ^* value of the coated surface was less than 1, but it had good performance in terms of eye fatigue.

On the other hand, since the coated paper of Comparative Example 1 did not contain an organic compound, the white paper glossiness, whiteness and color tone of the coated surface were inferior, and the blue light reduction rate and eye strain were inferior. Although the coated paper of Comparative Example 2 contains a violet dye and a blue coloring pigment in the coating layer, the wavelength of the maximum absorption peak is not in the range of 380 to 500 nm. It was inferior in blue light reduction rate and eye fatigue. The coated paper of Comparative Example 3 contained a yellow coloring pigment in the coating layer, but was slightly inferior in terms of eye fatigue due to poor absorption of blue light wavelengths.

Claims (11)

A coated paper having a coating layer containing a pigment and a binder resin on at least one side of the base paper,
A coated paper containing at least one organic compound having a maximum absorption peak in the visible light region with a wavelength of 380 to 500 nm. The coated paper according to claim 1, wherein the coating layer contains the organic compound. 3. The coated paper according to claim 1, wherein the coated surface of the coating layer has a degree of whiteness of 70 to 80%. The coated paper according to any one of claims 1 to 3, wherein the a ^* value of the coated surface of the coating layer is 0 to -5.0. The coated paper according to any one of claims 1 to 4, wherein the b ^* value of the coated surface of the coating layer is 1.0 to 10.0. The coated paper according to any one of claims 1 to 5, wherein the organic compound is at least one selected from tetracene derivatives, porphyrin derivatives, carotene derivatives and fucoxanthin derivatives. The coating according to any one of claims 1 to 6, wherein the organic compound is a tetracene derivative, and the tetracene derivative is contained in a proportion of 0.01 to 2% by mass relative to the solid content of the coating layer. paper. The coated paper according to any one of claims 1 to 7, wherein the coating amount of the coating layer is 2 to 20 g/m ² per side as a solid content. The coated paper according to any one of claims 1 to 8, wherein the proportion of calcium carbonate in the pigment is 60 to 100 mass%. The coated paper according to any one of claims 1 to 9, wherein the binder resin is a styrene-butadiene resin. The method for producing coated paper according to any one of claims 1 to 10, wherein the coating layer is applied to at least one side of the base paper using a blade coater or a rod blade coater.