JP2020196978A - Coated paper and manufacturing method thereof - Google Patents

Abstract

To provide a coated paper capable of suppressing the reflection of blue light and reducing eye fatigue, and to provide a method for manufacturing the coated paper.SOLUTION: The coated paper of this invention has a coating layer containing a pigment and a binder resin at least on one side of base paper, and contains at least one kind of organic compound having the maximum absorption peak in a visible light region of a wavelength of 380 to 500 nm. In the method for producing the coated paper, a coating layer is coated at least on one side of the base paper by using a blade coater or a rod blade coater.SELECTED DRAWING: None

Description

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

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

Several prior arts have already been disclosed for paper that is easy on the eyes and causes less eye strain. For example, Patent Document 1 discloses a paper containing at least used paper and having a specific numerical range of whiteness, an a ^* value and a b ^* value in the L ^* a ^* b ^* color difference notation. This defines the hue and whiteness that prevent the eyes from getting tired even when the user uses it for a long time, based on the results of a visual fatigue measurement test conducted by a plurality of subjects.

Further, Patent Document 2 describes a coating for printing having two coating layers, an undercoating layer containing a pigment and an adhesive as a main component, and a topcoating layer, on at least one surface of the base material. The paper is disclosed. The coating agent for the coated paper contains a regenerated pigment aggregate containing deinking floss as a main raw material as a pigment. The blank paper glossiness of this coated paper is 30 to 50%, the difference between the blank paper glossiness and the print glossiness is 30% or more, and the mapability value by the mapability tester is 10 to 35%.

Japanese Patent No. 3896762 Japanese Patent No. 4027957

In the invention described in Patent Document 1, the whiteness and hue of the paper are specified, but the type and content of the dye and pigment are not specified. Therefore, depending on the type of dye and pigment, there is a problem. It had the potential to be difficult to resolve. Further, the invention described in Patent Document 2 has two coating layers, an undercoat coating layer and a topcoat coating layer. Recycled pigment aggregates produced through many processes using deinked floss as the main raw material are used as pigments for coating agents, and there is room for improvement in terms of productivity and manufacturing cost. It was.

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

The present inventor has made repeated 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, the reflection of blue light from the coated paper can be suppressed and the above-mentioned problems can be solved. The invention was completed. 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 having a wavelength of 380 to 500 nm. Coated paper that is characterized by that.

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

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

(4) The coated paper according to any one of (1) to (3) above, wherein the a ^* value on the coated surface of the coated layer is 0 to −5.0.

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

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

(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 with respect to the solid content of the coating layer. The coated paper described in the section.

(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 ratio of calcium carbonate to 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 coated on at least one side of the base paper by using a blade coater or a rod blade coater. Manufacturing method.

The coated paper of the present invention can suppress the reflection of blue light and reduce eye fatigue. Further, the method for producing a coated paper of the present invention can produce the coated paper.

Hereinafter, embodiments of the present invention will be described with reference to specific examples of embodiments. However, the embodiments of the present invention are not limited to the following embodiments.

[Coated paper]
The coated paper of the present 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 a printing paper by printing on the coating layer side. The printing method is not particularly limited, such as offset printing, letterpress printing, flexo printing, gravure printing, screen printing, and inkjet printing.

(Base paper)
The base paper preferably contains wood pulp as a main component. Here, "mainly composed of wood pulp" means that wood pulp is contained in an amount of 50% by mass or more 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 usually used for papermaking can be used. Examples of wood pulp include chemical pulps such as broadleaf kraft pulp (LBKP), coniferous kraft pulp (NBKP), broadleaf sulphite pulp (LBSP), and coniferous sulphite pulp (NBSP), stone ground pulp (GP), and pressurization. Unbleached, semi-bleached, or bleached pulp, sulfite pulp, such as stone ground pulp (PGW), refiner ground pulp (RGP), chemi-grand pulp (CGP), thermomechanical pulp (TMP), chemi-thermomechanical pulp (CTMP), etc. Deinked waste paper pulp (DIP) and the like can be mentioned.

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

The Canadian standard pulp drainage degree (freeness, beating degree) measured according to JIS P 8121: 1995 of the base paper pulp shall be 400 to 600 ml from the viewpoint of the strength of the base paper and the prevention of ink strike-through during printing. Is preferable, and 520 to 580 ml is more preferable. Since the pulp fibers are not easily crushed when the amount is 400 ml or more, it is possible to effectively suppress the occurrence of ink strike-through during printing without reducing the thickness of the base paper. On the other hand, if it is 600 ml or less, the strength of the base paper can be improved. As a method for adjusting the drainage degree of the pulp of the base paper, various known methods are used.

(Filling fee)
It is preferable to add a filler to the base paper. By adding the 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 the filler 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, and water. Examples include zinc oxide. In addition, the filler contained in used paper and waste paper can be reused. The content of the filler is preferably 7 to 30% by mass, more preferably 13 to 20% by mass, based on the base paper.

(Size agent)
It is preferable to add a sizing agent to the base paper. By adding a sizing agent to the base paper, 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 the sizing agent include rosin-based, alkyl ketene 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, based on the base paper.

The base paper may further contain other additives. Other additives include aluminum sulfate, cationized starch, fixing agents typified by cationic polymer electrolytes, polyacrylamide-based polymers, paper strength enhancers typified by starch, melamine resin, urea resin and the like. Examples thereof include a wet paper strength enhancer, a yield improver, and a pH adjuster.

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

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

As the pigment, other types of pigments may be added as needed. 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. Can be mentioned.

The total content of the pigment 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)
The 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 the binder resin include water-soluble celluloses, natural water-soluble polymer derivatives, water-soluble polymers, resin water dispersion (latex), and the like. 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, casein and the like. 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 of the resin water dispersion include styrene-butadiene resin, ethylene-vinyl acetate resin, acrylonitrile-butadiene resin, polyurethane resin, vinyl acetate resin and the like. Among these, a resin aqueous dispersion (latex) of a styrene-butadiene resin is preferable from the viewpoint of good offset printing suitability and coating layer strength. When a styrene-butadiene resin is used as the binder resin, 7 to 26% by mass of the styrene-butadiene resin is preferable 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, and further preferably 10 to 15% by mass with respect to 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 having a wavelength of 380 to 500 nm among visible light. Prolonged exposure of the naked eye to blue light can cause eye strain, dry eye, sleep disorders, stiff shoulders, headaches, etc., which has become a health problem in recent years.

(Organic compound)
The present inventor has studied the inclusion of an organic compound having an absorption peak in the visible light region having a wavelength of 380 to 500 nm in the coated paper in order to suppress the reflection of blue light from the coated paper. Among them, in particular, an organic compound having a maximum absorption peak in the visible light region having a wavelength of 380 to 500 nm (hereinafter, may be simply referred to as “organic compound”) was examined.

By containing an organic compound in the coating paper, visible light including blue light is absorbed, so that the reflection of blue light among the visible light emitted from the lighting device is suppressed and the eye fatigue is reduced. Is possible. The coated paper may contain at least one type of organic compound.

The method of containing the organic compound in the coated paper includes a method of containing the organic compound in the coated layer and a method of containing the organic compound in the base paper. The method of incorporating the organic compound in the coating layer is preferable because the efficiency of absorbing blue light by the organic compound becomes higher.

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

Specific examples of the tetracene derivative 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- Examples thereof include diamine (abbreviation: p-mPhTD) and tetracene. Specific examples of the porphyrin derivative include a porphyrin derivative, a tetraphenylporphyrin derivative, and a tetrabenzoporphyrin derivative. Specific examples of the carotene derivative include α-carotene, β-carotene, and lycopene.

Among these organic compounds, a tetracene derivative and a porphyrin derivative are preferable, and a tetracene derivative is more preferable, from the viewpoint of absorption of blue light wavelength. These organic compounds may be used alone or in combination of two or more.

The content of the organic compound in the coating layer depends on the type of the 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. It is preferable, and 1 to 2% by mass is more preferable.

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

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

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

The a ^* value on the coated surface of the coating layer is preferably 0 to −5.0, and more preferably −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 in accordance with 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 preferably 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 in accordance with JIS Z 8781-4: 2013.

[Manufacturing method of coated paper]
(Manufacturing method of base paper)
The base paper can be obtained by making paper by various paper machines by a conventional method, forming a wet paper, and then drying it. At the time of papermaking, organic compounds are added as needed. After that, it is manufactured through a treatment process by a conventional method such as a surface size press process and a smoothing process using a calendar or the like.

Examples of the paper machine include a long net paper machine having an air cushion head box or a hydraulic head box, a twin wire paper machine, an on-top type twin wire paper machine, a Yankee paper machine, and the like.

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

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

This embodiment will be described in more detail with reference to the following examples. In the following description, "part" means "part by mass" and "%" means "% by mass".

The raw materials used in the examples and comparative examples are as follows.
Cationic starch: Ace K-100, manufactured by Oji Cornstar
Anhydrous alkenyl succinic acid-based neutral sizing agent: manufactured by Arakawa Chemical Industries, Ltd., size pine SA-864
Oxidized starch: Ace A, manufactured by Oji Cornstarch
Dispersant: Toagosei, Aron A-9
Calcium carbonate: Okutama Kogyo Co., Ltd., TP123CS
Kaolin: Engelhard, Miragros Styrene-butadiene copolymer Latex: JSR, OJ-3000H
Starch: Tetracene derivative manufactured by Oji Cornstarch: Tetracene manufactured by Kanto Chemical Co., Inc., 909B4037, maximum absorption peak wavelength 477 nm
Violet Dye: Nippon Kayaku Co., Ltd., Kayafect Violet BC Liquid Blue Color Pigment: Dainichiseika Co., Ltd., TB520 Blue 2B
Yellow coloring pigment: manufactured by Dainichiseika Co., Ltd. TB910 Yellow FR

(Example 1)
<Creation of base paper>
20% by mass of light calcium carbonate was added to a slurry of 100% by mass of broad-leaved bleached kraft pulp (filter water content 400 ml CSF), and 1% by mass of cationized starch and 0.2% by mass of anhydrous alkenylsuccinic acid-based neutral sizing agent were added. It was added and mixed thoroughly to prepare a papermaking raw material. Then, the water content was dried to 10% using a long net multi-cylinder paper machine, and 4 g / m ² of a 7 mass% solution of oxidized starch was applied on both sides by a size press. Then, it was dried and dried to a moisture content of 7% to prepare a base paper having a basis weight of 50 g / m ² .

<Preparation of water-based coating liquid A for coating layer>
50% by mass of calcium carbonate and 50% by mass of kaolin were added to an aqueous solution to which 0.2% by mass of a dispersant was added, and the mixture was dispersed by a choles disperser to prepare a pigment slurry. A water-based coating liquid A for a coating layer, to which 15% by mass of styrene-butadiene copolymer latex, 10% by mass of starch, and 1% by mass of a tetracene derivative are added as a binder resin to this pigment, and the solid content concentration is 65% by mass. 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.

<Making coated paper>
On a base paper basis weight of 50 g / m ^2, the coating layer aqueous coating liquid A, dry mass (solid content) is double-sided Nurihi a blade coater so that the 5 g / m ² on one surface, and dried After that, a super calendar finish was performed to obtain a coated paper having a basis weight of 70 g / m ² .

(Example 2)
In the preparation of the water-based coating liquid A for the coating layer of Example 1, the same as in Example 1 except that 1% by mass of the tetracene derivative was changed to 2% by mass to obtain the water-based coating liquid B for the coating layer. To make coated paper.

(Example 3)
In the preparation of the water-based coating liquid A for the coating layer of Example 1, 1% by mass of the tetracene derivative was changed to 0.5% by mass to obtain the water-based coating liquid C for the coating layer. A coated paper was prepared in the same manner.

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

(Comparative Example 1)
In the preparation of the water-based coating liquid A for the coating layer of Example 1, the coating paper was prepared in the same manner as in Example 1 except that the water-based coating liquid F for the coating layer to which 1% by mass of the tetracene derivative was not added was used. Made.

(Comparative Example 2)
In the preparation of the aqueous coating liquid A for the coating layer of Example 1, 10% by mass of starch was changed to 70% by mass and 1% by mass of the 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 produced in the same manner as in Example 1 except that the water-based coating liquid G for the coating layer was prepared.

(Comparative Example 3)
In the preparation of the water-based coating liquid 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 obtain the water-based coating liquid H for the coating layer. A coated paper was produced in the same manner as in Example 1.

The coated papers obtained in the above Examples and Comparative Examples were measured and evaluated for various performances by the methods described below. The results are shown in Table 1.

<Blank paper gloss on the 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 Technology Research Institute
It was determined that the white glossiness was preferably 30 to 50%.

<Whiteness on the coated surface>
Measurements were made based on JIS P 8148: 2005 (ISO 2470).
Measuring device: Reflectance meter manufactured by Suga Test Instruments Co., Ltd., product number SC-10WP

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

<Blue light reduction rate evaluation)>
Using a spectroscopic altitude meter (V-770) manufactured by JASCO Corporation, the transmittance spectrum is measured in the wavelength range of 250 nm to 800 nm, the transmittance in the wavelength range of 380 nm is read, and the blue light cut reduction rate is calculated from the comparison with the base paper. did. Furthermore, it was evaluated according to the following criteria.
(Evaluation criteria)
⊚: 25% or more 〇: 15% or more and less than 25% Δ: 5% or more and less than 15% ×: less than 5%

<Eye fatigue (sensory evaluation)>
After printing on coated paper and having 20 male and 20 female subjects (40 in total) read for 10 minutes, they answered the degree of eye fatigue in the following five stages.
5: Easy to read 4: Somewhat easy to read 3: Normal 2: Somewhat tired 1: Very tired The average value of the answers of 40 people was evaluated on a 4-point scale based on the following criteria.
(Evaluation criteria)
⊚: 4.5 or more 〇: 4.3 or more and less than 4.5 Δ: 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 degree. Since the coated paper of Example 4 had a slightly low content of organic compounds, 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, it was inferior in the glossiness, whiteness and color tone of the coated surface, and was inferior in each performance of the blue light reduction rate and the degree of eye fatigue. 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, so that the white paper glossiness, whiteness and color tone of the coated surface 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 eye fatigue due to its inferior absorption of blue light wavelength.

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 having a wavelength of 380 to 500 nm. The coated paper according to claim 1, wherein the coating layer contains the organic compound. The coated paper according to claim 1 or 2, wherein the whiteness of the coated surface of the coated layer is 70 to 80%. The coated paper according to any one of claims 1 to 3, wherein the a ^* value on the coated surface of the coated layer is 0 to −5.0. The coated paper according to any one of claims 1 to 4, wherein the b ^* value on 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 a tetracene derivative, a porphyrin derivative, a carotene derivative and a fucoxanthin derivative. 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 with respect 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 ratio of calcium carbonate to the pigment is 60 to 100% by 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 a coated paper according to any one of claims 1 to 10, wherein the coating layer is coated on at least one side of the base paper using a blade coater or a rod blade coater.