JPH09268495A - Mat coated paper having uncoated paper-like touch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a mat coated paper having an uncoated paper-like touch close to that of a base paper before coating, excellent in ink color development, hardly causing ink stain resulting from friction against a white paper surface. SOLUTION: This mat coated paper having uncoated paper-like touch comprises 3-40wt.% calculated as a solid content ratio based on the whole pigments in a coated layer of a non-hollow organic pigment having 80-400ml/100g oil absorption and 70-9wt.% calculated as a solid content ratio based on the whole pigments of the total of at least one pigment selected from kaolin, delaminated kaolin and talc having 1.5-15μm average particle diameter as pigments and 15-40wt.% calculated as a solid content ratio of based on the whole pigments of a polymer latex having 5-50wt.% gel content and has 1-10% gloss value, 1-25 second smoothness and 2.0-6.0μm surface roughness Ra as the surface physical properties of the pigment coated layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a matte coated paper provided with a pigment coating layer, and in particular, the product has a non-coated paper texture close to that of a base paper before coating, and further has an ink coloring property when printed. The present invention relates to a matte coated paper which is excellent in ink resistance and does not easily cause ink stains due to friction with a blank surface after printing.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for printing papers that maintain a touch, unevenness and bulkiness similar to those of uncoated papers and that are excellent in ink coloring and dot reproducibility when printed. However, in actual uncoated paper, the ink density does not rise when printed, or it is difficult to produce clear gradation because of the poor reproducibility of fine halftone dots. I have some difficulties. On the other hand, general coated paper has a pigment coating layer that eliminates the unevenness of the base paper, and if necessary, calendering is performed to improve smoothness, thus improving ink coloring and halftone dot reproducibility. Although it is excellent, it has less unevenness, and the feel and visual feeling are different from the uncoated paper texture.

From the above, in order to obtain a product excellent in ink coloring and dot reproducibility when printed while maintaining the feel, unevenness and bulkiness close to those of uncoated paper, The pigment coating layer is provided on the base paper within a range that does not impair the above. However, when the unevenness is emphasized, the printing finish becomes insufficient, and when the printing finish is emphasized, the unevenness of the base paper disappears and the texture of the uncoated paper is not obtained, so both the texture of the uncoated paper and the printability are compatible. At present, it is very difficult to get it done.

Further, since it is necessary to maintain the texture of uncoated paper and to prevent the white paper gloss after coating from rising, a pigment having relatively coarse particles is preferred as a pigment in the coating layer. Used. The product finished in this way is subjected to printing, bookbinding process, or transportation process, especially when the printing surface and the blank paper surface are overlapped and the work is proceeded. As a result of scraping off the ink by rubbing it against the coating layer on the paper surface, there is a problem that the white paper surface is easily stained with ink, that is, so-called ink stain is likely to occur.

In order to solve such ink stains,
Measures have been taken to reduce the coefficient of friction between the printed surface and the blank surface by adding a friction-resistant compound containing wax as a main component to the ink. On the other hand, as the coated paper, a method of treating the coated paper with a high temperature soft calender having a certain temperature or more (JP-A-5-117995), delaminated kaolin having an average particle diameter of 0.4 to 1.0 μm is used. A method of providing a coating layer containing a specific amount (JP-A-5-5
No. 297) has been proposed. However, at present, none of the methods has been able to obtain a coated paper having the texture of uncoated paper desired by the present invention.

Further, a fatty acid emulsion in the coating layer,
A method of forming a coating layer by incorporating a lubricant such as a fatty acid salt emulsion, a wax emulsion, or a polyethylene emulsion has been proposed (Japanese Patent Laid-Open No. 158594/1994). The present situation is that a matte coated paper having the texture of a non-coated paper has not yet been obtained.

[0007]

DISCLOSURE OF THE INVENTION The present invention relates to a matte coated paper provided with a pigment coating layer, and more particularly to a coated paper having an uncoated paper texture whose appearance is close to that of a base paper before coating, In addition, the problem of ink stain, which is often found in conventional matte coated papers, is very effectively solved, and the matte coated papers are excellent in print finish, especially ink coloring property.

[0008]

The present invention provides a matte coated paper having a non-coated paper texture in which a pigment coating layer containing a pigment and an adhesive as a main component is provided on at least one surface of a base paper. As the pigment, a non-hollow organic pigment having an oil absorption of 80 to 400 ml / 100 g according to JIS K5101 is 3 to 40% by weight based on the total solid content in the coating layer, and an average particle diameter is 1. The total amount of at least one pigment selected from the group consisting of kaolin, delaminated kaolin, and talc, which is 5 to 15 μm, is contained so as to be 70 to 97% by weight based on the total solid content. On the other hand, a polymer latex having a gel content of 5 to 50% as an adhesive is 1 in terms of solid content relative to all pigments.
5 to 40% by weight, and as the surface properties of the pigment coating layer, the glossiness according to JIS P8142 is 1 to 10%, the smoothness according to JIS P8119 is 1 to 25 seconds, And a matte coated paper having a non-coated paper texture, characterized in that the surface roughness Ra according to JIS B0601 is finished to be 2.0 to 6.0 μm.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The inventors of the present invention have found that a glossy coated paper having excellent printability can be obtained, which solves ink stains that are easily exhibited in matte coated paper and does not impair the texture of uncoated paper. We have earnestly studied to obtain erase-coated paper. As a result, as a pigment, a non-hollow organic pigment having a specific oil absorption amount, one or more of kaolin, delaminated kaolin, and talc having a specific particle size, and a specific polymer latex are applied as pigments. By including it in the layer and finishing the surface of the obtained pigment coating layer so as to have specific surface physical properties, the above-mentioned problems are extremely effectively solved, and a non-coating exhibiting an excellent print finish. It was found that a matte coated paper having a paper texture can be obtained, and finally the present invention was completed.

That is, the coated paper has the texture of non-coated paper (base paper), and when printed, the ink coloring property is good,
And as a method of obtaining a matte coated paper that hardly causes ink stains even if the ink on the printed surface and the coating layer on the white paper surface rub,
It has been found that it is very important for the pigment coating layer to have the following physical properties (1) to (5) at the same time. Glossiness according to JIS P8142 (measurement condition 7
5 °) is 1 to 10% Smoothness according to JIS P8119 is 1 to 25 seconds Surface roughness Ra according to JIS B0601 is 2.
0 to 6.0 μm In particular, the above conditions 1 to 5 are necessary for obtaining the texture of uncoated paper (base paper). Incidentally, if any one of them does not meet the requirement, the desired effect of the present invention cannot be obtained.

First, the glossiness of the pigment coating layer of 1 to 10
Specification of% is necessary in order to make its appearance close to that of uncoated paper. Incidentally, when it is less than 1%, the texture of uncoated paper can be obtained, but the ink coloring property and the printing smoothness are deteriorated and satisfactory printability cannot be obtained. On the other hand,
When it exceeds 10%, the appearance is close to the texture of coated paper, which is not preferable.

Further, the smoothness of 1 is specified for 1 to 25 seconds and the surface roughness Ra thereof is specified to be 2.0 to 6.0 μm in order to make its appearance and touch feel close to those of uncoated paper. is necessary. Incidentally, if the smoothness is less than 1 second or the surface roughness Ra exceeds 6.0 μm, the color developability of the ink is deteriorated, which is not preferable. On the other hand, if the smoothness exceeds 25 seconds or the surface roughness Ra is less than 2.0 μm, the surface appearance of the pigment coating layer approaches the texture of the coated paper, which is not preferable.

Measures for obtaining the physical properties of the coating layer include, for example, smoothness of the base paper, selection of the type and particle size of the pigment used in the coating layer, and coating of the coating layer composition on the base paper. In that case, it can be achieved by appropriately adjusting the coating method, the coating amount, or the calendering condition after coating. By the way, it is relatively easy to satisfy only one of the above-mentioned surface physical property requirements, but in order to simultaneously satisfy a plurality of requirements, some of the above-mentioned measures are appropriately combined. To obtain desired surface physical properties.

Further, in order to obtain the desired effects of the present invention, it is not sufficient to satisfy the surface properties of the coating layer as described above, and the materials constituting the coating layer as described below ( In particular, by incorporating specific requirements for pigments and adhesives), an excellent effect that satisfies all of the texture, printability, and ink stains of uncoated paper can be obtained. Further, it has been found that more excellent effects can be obtained by preferably adjusting the lubricant contained in the pigment coating layer, the smoothness of the base paper used, and the surface roughness Ra.

That is, as the pigment of the pigment coating layer, JIS
Oil absorption according to K5101 is 80-400ml / 10
At least 1 selected from kaolin, delaminated kaolin, and talc, in which the solid content of the non-hollow organic pigment of 0 g is 3 to 40% by weight with respect to the total pigment, and the average particle diameter is 1.5 to 15 μm. It is important that the seed (or the total amount of two or more kinds) is contained in a solid content of 70 to 97% by weight with respect to the total pigment. Here, the non-hollow organic pigment refers to one having no single void isolated from the outside inside the pigment particle, for example, an organic pigment having a large number of fine voids formed as an aggregate of fine particles. Alternatively, an organic pigment having an internal void penetrating from the particle surface or the like is applicable. By the way, when a hollow organic pigment is used as the organic pigment, the outer shell of the pigment is thin and highly deformable because it has a single large void inside, and as a result, the glossiness is 10
%, Uncoated paper texture may be lost, which is not preferable.

When the content of the organic pigment is less than 3% by weight, or the oil absorption of the organic pigment is 80 ml / 100 g.
If it is less than 1, the ink setting becomes slow and set-off easily occurs, which is not preferable. On the other hand, the oil absorption of organic pigments is 400
ml / 100g or more than 40
When it exceeds the weight%, the absorption of ink becomes too large and a high printing (ink) density cannot be obtained. Further, the content of the organic pigment is more preferably adjusted to 3 to 14% by weight in order to effectively balance the uniformity of ink transfer, the ink setting property, or the print density.

The oil absorption amount according to JIS K5101 is 8
Examples of the non-hollow organic pigment of 0 to 400 ml / 100 g include urea-formaldehyde resin and JP-A-2-7074.
No. 1 discloses a styrene-acryl-based konpeito sugar-like porous particle or fine particle aggregated porous particle, and further, JP-A-5-222108 discloses the production method. As a structure of a particle of styrene-acrylic type or the like when dried, a through-hole type particle having at least one through hole connecting the surface layer portion of the particle to the inside thereof can be exemplified.

Further, at least one kind selected from kaolin, delaminated kaolin, and talc having an average particle diameter of 1.5 to 15 μm (in the case of two or more kinds, the total amount thereof) is a solid content based on all pigments. And 70-97% by weight
It is important to allow the ink to be effectively contained in the ink while suppressing an increase in the glossiness of the white paper. Incidentally, the average particle size of kaolin, delaminated kaolin, and talc is 1.5.
When the coated paper having a thickness of less than μm is used, the glossiness of the coated white paper may exceed 10%, and the texture of the non-coated paper may not be obtained. This is not preferable because there is concern about deterioration in ink colorability and ink stains. Further, if the content is less than 70% by weight, there is a concern that the effect of eliminating or reducing ink stain may not be obtained.

In the present invention, even when the above-mentioned pigment is used, a gel content of 5 to 50 is used as an adhesive in order to achieve a high printing density and to balance the printability of an ink set or the like. It is important to add the polymer latex in an amount of 15% to the pigment in the coating layer so that the solid content is 15 to 40% by weight. Incidentally, when the content of the polymer latex is less than 15% by weight or the content of the gel is less than 5%, a high printing density may not be obtained. On the other hand, when the polymer latex content exceeds 40% by weight or the gel content exceeds 50%, a high printing density can be obtained, but the ink setting becomes slow and set-off easily occurs. , Not preferable.

In the present invention, in addition to the above-mentioned organic pigment, kaolin having a specific particle size, delaminated kaolin and talc, a general pigment for coated paper can be used if necessary. Specific examples include calcined kaolin, structured kaolin, amorphous silica, zinc oxide, zinc hydroxide,
Inorganic pigments such as aluminum oxide, aluminum hydroxide, barium sulfate, satin white, titanium dioxide, aluminum silicate, magnesium silicate, calcium carbonate, magnesium carbonate, diatomaceous earth, bentonite and sericite, and organic pigments other than the organic pigments specified above. And the like, and one or more kinds of these pigments can be appropriately combined and used within a range not impairing the desired effect of the present invention.

The polymer latex used in the present invention is, for example, a conjugated diene latex such as a styrene-butadiene copolymer latex or a polymer or copolymer latex of acrylic acid ester and / or methacrylic acid ester. Acrylic latex such as, vinyl latex such as ethylene-vinyl acetate copolymer latex and the like, further acrylic acid ester and methacrylic acid ester together with styrene and butadiene,
Further, a modified latex such as a modified styrene-butadiene copolymer latex obtained by reacting an acid monomer such as acrylic acid, itaconic acid or crotonic acid can be used.

The gel content of the polymer latex used depends on the composition of the monomers to be polymerized, the composition and mixing ratio of various monomers in the case of copolymerization, the amount of polymerization initiator, chain transfer agent, and polymerization terminator. It can be controlled by changing the polymerization conditions such as type, type and reaction temperature.

In addition to such a polymer latex, a polymer latex outside the range specified in the present invention may be used in combination so long as the desired effects of the present invention are not impaired, and further, casein, soybean protein, synthetic protein, etc. Proteins, various starches such as starch and oxidized starch, polyvinyl alcohol, cellulose derivatives such as carboxymethyl cellulose and methyl cellulose, olefin-maleic anhydride resin, etc., and at least one general adhesive for coated paper should be used in combination. You can also

In the pigment coating layer, polyolefin resin particles having an average particle diameter of 8 to 30 μm measured by a laser diffraction method as a lubricant are used in a solid content of 2.5 with respect to all pigments.
The inclusion of 5 wt% is a preferable embodiment because ink stains can be further eliminated.

Generally, a polyolefin resin is used as a lubricant and a release agent in the field of coated paper manufacturing, but the average particle diameter is mainly 5 μm or less. As a result of various investigations focusing on the polyolefin resin particles, the present inventors have found that when used in matte coated paper, there is a specific particle size that effectively acts to prevent ink stains. is there. That is, as described above, the ink stain is a phenomenon in which the ink on the printed surface is scraped off by the unevenness of the white paper surface.By including the polyolefin resin particles having the specific average particle size as described above, the polyolefin particles are printed on the printed surface. It acts as a spacer to prevent the contact between the paper and the blank surface, and effectively suppresses the generation of ink stains.
It was also found to be more effective in obtaining a texture similar to that of uncoated paper.

Incidentally, if the average particle size of the polyolefin resin particles is less than 8 μm, the action as a spacer is poor and the effect of improving ink stain is poor, while if the particles are larger than 30 μm, the ink transfer failure occurs during printing. May cause. Further, when the amount of the polyolefin resin particles added is less than 2.5% by weight based on all pigments,
The effect of eliminating ink stains is poor. On the other hand, when the amount exceeds 5% by weight, the adhesion between the coating layer and the ink is insufficient, and there is a risk that the ink will be easily removed when it comes into contact with the white paper surface. is there.

In addition to the above-mentioned pigments, adhesives, and polyolefin resin particles, the water-based paint constituting the pigment coating layer includes an antifoaming agent, a coloring agent, a release agent, a flow-altering agent, a water-proofing agent,
Preservatives and the like are also used if necessary.

In the present invention, the basis weight of the base paper used is not particularly limited and is generally 30 to 40.
Those of about 0 g / m ² are appropriately used. In addition, the papermaking method of the base paper and the papermaking machine are not particularly limited, and for example, by acid paper or alkaline papermaking, fourdrinier machine, round net machine, combination machine of fourdrinier and round net or twin wire machine, on-top machine. A method such as a twin wire machine can be appropriately selected. On the other hand, as the pulp used as the raw material for the raw paper, it is possible to use chemical pulp, mechanical pulp or waste paper pulp made from wood or non-wood. Further, precoating with a size press or the like, patterning with a blanket or the like in a press process of a machine, or a base paper for imprinting such as embossing after papermaking is appropriately used.

However, in order to further enhance the effect desired by the present invention, as the base paper to be used, JIS
Smoothness according to P8119 is 0.5 to 20 seconds, and J
Surface roughness Ra according to ISB0601 is 3.2 to 7.
When the base paper having a thickness of 0 μm is used, a good non-coated paper texture can be effectively exhibited even after the pigment coating layer is provided, which is a more preferable embodiment. By the way, the smoothness of the base paper is 20
If it exceeds seconds or the surface roughness Ra is less than 3.2 μm, the texture after coating may be the same as that of general matte coated paper. On the other hand, if the smoothness is less than 0.5 seconds or the surface roughness Ra exceeds 7.0 μm, there is a fear that the ink colorability after printing may be deteriorated.

The coating amount of the pigment coating layer on the base paper is not particularly limited, but in order to maintain the texture of the uncoated paper, the excellent ink coloring and the printability, The coating amount is preferably ^{2 to 20} g / m ² , and more preferably 3 to 15 g / m ² . Incidentally, when the coating amount is less than 2 g / m ² , the ink coloring property after printing may be deteriorated and uniform ink deposition may not be obtained. On the other hand, when it exceeds 20 g / m ² , the glossiness according to JIS P8142 exceeds 10%, the smoothness according to JIS P8119 becomes 25 seconds or more, or the surface roughness according to JIS B0601. Ra may be 2.0 μm or less. As a result, the texture after coating is almost the same as that of general matte coated paper, and the effect desired by the present invention cannot be obtained.

The coating device for forming the coating layer is not particularly limited, and a publicly known and used coating device can be used. As a specific example, an air knife coater,
A blade coater, a roll coater, a reverse roll coater, a bar coater, a curtain coater, a slot die coater, a gravure coater, a chanplex coater, a size press coater, a bill blade coater, or the like can be used, and one or more of these coaters are included. An on-machine coater or an off-machine coater can be used to provide a single or multiple coating layers on the base paper. Among the above-mentioned devices, the air knife coater can form a uniform coating layer while maintaining the unevenness of the paper before coating, and thus can be preferably used.

The solid content concentration of the coating material for forming the pigment coating layer is generally 20 to 70% by weight, but it is adjusted in the range of 25 to 65% by weight in consideration of coating suitability and operability. Incidentally, as a method for drying the wet pigment coating layer coated on the base paper, steam heating conventionally used,
Various drying methods such as hot air heating, gas heater heating, high frequency heating, electric heater heating, infrared heater heating, laser heating and electron beam heating can be appropriately used. The coated paper thus obtained can be finished by passing it through a calender, if necessary, within a range that does not impair the surface properties specified in the present invention.

[0033]

The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. Unless otherwise specified, “parts” and “%” in the examples and comparative examples represent “parts by weight” and “% by weight”, respectively. In addition, each measurement method and evaluation method,
It is as follows.

[Gel Content of Polymer Latex] 10%
After the pH of the polymer latex was adjusted to 8.0 with an aqueous sodium hydroxide solution, the latex to be measured was added so that the thickness would be 1 mm on a glass plate, and the mixture was dried at room temperature for one day and then with a vacuum dryer. Further, it was dried under reduced pressure for one day. About 1 g of this film was precisely weighed and put in a 400 ml (millimeter) Erlenmeyer flask with a stopper together with 400 ml of toluene and left for 24 hours. Then, the toluene solution was filtered through a wire net of known weight, and dried overnight in a drier at 80 ° C.,
After cooling in a desiccator, the weight of the latex film on the wire mesh was measured. Using the obtained data, the gel content measured value (%) was calculated by the following equation (1).

Measured value of gel content (%) = [weight of film on wire mesh / weight of sample (g)] × 100 (1)

[Average Particle Diameter of Pigment] Cedigraph 500
0 (Shimadzu Corporation) was used to measure the particle size distribution, and the particle size when the cumulative weight was 50% was taken as the average particle size.

[Average particle diameter of lubricant] By a laser diffraction method (measuring instrument: SALD-2000 / Shimadzu)
The particle size distribution was measured and the particle size when the cumulative weight was 50% was taken as the average particle size.

[Glossiness of white paper] The glossiness was measured at an angle of 75 ° in accordance with JIS P8142.

[Smoothness] The smoothness was measured according to JIS P8119.

[Surface Roughness Ra] In accordance with JIS B0601, a Surf Test 201 series 178 (manufactured by Mitoyo Seisakusho Co., Ltd.) was used under the conditions of a cutoff value of 0.8 mm and a measurement length of 4 mm.

[Ink stain] A sheet offset ink (trade name:
Printing was performed on the uncoated surface of a commercially available single-sided coated paper (trade name: Kanato one-sided / Shin-Oji Paper Co., Ltd.) using 1.0 ml of F-Gloss (Daini Nippon Ink and Co.). After leaving this for 3 days, it is used in a blank part of each coated paper obtained in Examples 1 to 10 and Comparative Examples 2 to 11 and Comparative Example 1 by using a dyed friction fastness tester (Toyo Seiki Seisakusho). The base paper (fixed) and the printed surface of the printed matter (reciprocating motion) were brought into contact with each other and subjected to 5 reciprocating frictional movements by applying a load of 600 g, and the transferred state (ink stain) of the ink transferred from the printed surface to the white paper surface was as follows. It was evaluated visually according to the standard. A: Almost no ink transfer. ◯: The ink is slightly transferred, but practically no problem. X: A large amount of ink is transferred, which is a practical problem.

[Printing Density (Ink Color Development)] The optical density of the black ink solid portion when simultaneously printed by a sheet-fed printing machine was measured by a Macbeth densitometer (measurement device name: RD-914 / Macbet).
h company). The larger the value, the higher the density and the better the color development of the ink.

[Hand of uncoated paper] The touch (feel) and visual appearance were evaluated according to the following criteria. ◎: Unlike conventional matte coated paper, it has an uncoated paper texture with a good feel. ◯: Unlike the conventional matte coated paper, it has an uncoated paper texture, but the texture is slightly inferior, but there is no practical problem. X: Indistinguishable from the conventional matte coated paper, the desired effect cannot be obtained.

[Ink set] The offsetting sheet-fed printing machine was used to perform four-color solid printing at a printing speed of 8000 sheets / hour, and the set-off situation when printing 5000 sheets in a stack is shown below. It was evaluated according to the standard. ⊚: Good with no set-off. ○: There is slight offset, but there is no problem in practical use. X: The set-off is severe, which is a problem.

Example 1 Kaolin for papermaking having an average particle diameter of 2.5 μm (trade name: NK
To 100 parts of kaolin / Chuo Kaolin Co., 0.2 parts of dispersant (trade name: Aron T-40 / Toagosei Co., Ltd.) (as solid content) was added, and a dispersion having a concentration of 56% was obtained using a Choles disperser. It was Separately, 100 parts of delaminated kaolin (trade name: Nusurf / Engelhard) having an average particle diameter of 2.1 μm was added to 100 parts of a dispersant (trade name: Aron T-4).
0 / Toagosei Co., Ltd.) 0.1 part (as solid content),
Using a Choles disperser, a dispersion having a concentration of 60% was obtained.

Kaolin for papermaking, dispersion of delaminated kaolin for coating, dispersion of heavy calcium carbonate (trade name: FMT-70 / Pharmatech), and non-hollow organic pigment having an oil absorption of 250 ml / 100 g. Urea formaldehyde resin (trade name: COPEARL C-12
2 / Mitsui Toatsu Kagaku Co., Ltd.) to make kaolin for paper making / delaminated kaolin for coating / heavy calcium carbonate / organic pigment = 45/30/5/20 (parts / solid content) The liquids were mixed and water was added to obtain a pigment slurry having a concentration of 50%.

Next, in this slurry, a styrene-butadiene copolymer latex (trade name: LX4) having a glass transition temperature of 38 ° C. and a gel content of 38% as an adhesive was added.
07F T-2047 / ZEON Corporation 25 parts, oxidized starch (trade name: Ace A / Oji Corn Starch Co., Ltd.) 3 parts (each solid content), and water was further added to obtain a coating material having a solid content concentration of 40%. .

The thus-obtained coating material was used in an amount of 150 g / tsubo.
m ^2, smoothness of 8 seconds, the surface roughness Ra of 10% 4.5 [mu] m of bleached cotton linter pulp, NBKP20%, LBK
Both sides of a base paper containing P70% as a main component were coated with an air knife coater so that the dry weight per side was 6 g / m ^2, and after drying with hot air, a coated paper with a water content of 5% was obtained.

Example 2 Example 2 was repeated except that the mixing ratio of kaolin for papermaking / delaminated kaolin for coating / heavy calcium carbonate / organic pigment was changed to 45/30/15/10. A coated paper was obtained in the same manner as in Example 1.

Example 3 In Example 1, a high density polyethylene particle powder (trade name: Miperon XM221-U / having an average particle size of 27.5 μm) was used as a lubricant (polyolefin resin particle) in the coating material.
(Mitsui Toatsu Chemical Co., Ltd.) was dispersed in water with a nonionic surfactant, and then 3.0 parts (as solid content) was added to 100 parts by weight of the pigment, to prepare a coated paper in the same manner as in Example 1. Obtained.

Example 4 In Example 1, as a lubricant (polyolefin resin particles) in the coating composition, a polyethylene wax emulsion having an average particle size of 9.1 μm (trade name: Slip Aid SL-) was used.
A coated paper was obtained in the same manner as in Example 1 except that 4.0 parts (as solid content) of 100 / San Nopco) was added.

Example 5 In Example 1, the oil absorption of the organic pigment was 90 ml / 10.
A coated paper was obtained in the same manner as in Example 1 except that the amount of the non-hollow organic pigment fine particle aggregated porous particles (trade name: Grosdale 110M / Mitsui Toatsu Chemical Co., Inc.) was changed to 0 g.

Example 6 In Example 1, an organic pigment having an oil absorption of 150 ml / 1 was used.
Through-hole type particles of non-hollow organic pigment (product name:
A coated paper was obtained in the same manner as in Example 1 except for changing to Grossdale 62S / Mitsui Toatsu Chemicals, Inc.).

Example 7 In Example 1, the copolymer latex in the coating material was changed to a styrene-butadiene copolymer latex (trade name: T2648 / Nippon Synthetic Rubber Co., Ltd.) having a glass transition temperature of 9 ° C. and a gel content of 10%. A coated paper was obtained in the same manner as in Example 1 except that the changes were made.

Example 8 In Example 1, as the base paper, the pulp composition was NBKP.
5%, LBKP 95%, a blanket was shaped in the press part of the machine, smoothness 1 second, surface roughness 7.5 μm, tsubo 15
A coated paper was obtained in the same manner as in Example 1 except that 0 g / m ² of base paper was used.

Comparative Example 1 Example 1 was repeated except that the mixing ratio of kaolin for papermaking / delaminated kaolin for coating / heavy calcium carbonate / organic pigment was changed to 30/25/25/20. A coated paper was obtained in the same manner as in Example 1.

Comparative Example 2 The procedure of Example 1 was repeated except that the mixing ratio of kaolin for papermaking / delaminated kaolin for coating / heavy calcium carbonate / organic pigment was changed to 30/20/5/45. A coated paper was obtained in the same manner as in Example 1.

Comparative Example 3 In Example 1, the copolymer latex in the coating composition was styrene having a glass transition temperature of −11 ° C. and a gel content of 88%.
Butadiene copolymer latex (trade name: T2550K
/ Nippon Synthetic Rubber Co., Ltd.), and coated paper was obtained in the same manner as in Example 1.

Comparative Example 4 A coated paper was prepared in the same manner as in Example 2 except that the organic pigment in the coating material was changed to a hollow organic pigment (trade name: HP-91 / Rohm and Haas Co.). Obtained.

Comparative Example 5 In Example 2, the oil absorption of the organic pigment in the paint was 75 ml.
/ 100g of non-hollow organic pigment (trade name: Grosdale 2
01S / Mitsui Toatsu Chemical Co., Ltd.)
A coated paper was obtained in the same manner as.

Comparative Example 6 In Example 1, the mixing ratio of kaolin for papermaking / delaminated kaolin for coating / heavy calcium carbonate / organic pigment was changed to 45/40/15/0 (the organic pigment was changed to A coated paper was obtained in the same manner as in Example 1 except that it was not used).

Comparative Example 7 In Example 1, both kaolin for papermaking and delaminated kaolin for coating were coated with kaolin (trade name: HT / Engelhard Co., USA) having an average particle size of 0.55 μm. A coated paper was obtained in the same manner as in Example 1 except for the above.

The results obtained as described above are summarized in Table 1.

[0064]

[Table 1]

[0065]

As is clear from the results shown in Table 1, the matte coated paper obtained in the present invention has a non-coated paper texture close to that of the base paper before coating, and the ink coloring property when printed further. It was a matte coated paper that was excellent in ink resistance and that it was difficult for ink stains (rubbing stains) to occur due to friction with the blank surface after printing.

Claims (4)

[Claims] 1. A matte coated paper having a non-coated paper texture, comprising a pigment coating layer comprising a pigment and an adhesive as a main component on at least one side of a base paper.
Oil absorption of 80 to 400 ml / 1 according to K5101
The non-hollow organic pigment (00 g) is 3 to 40% by weight based on the solid content based on all the pigments in the coating layer, and the average particle size is 1.
The total amount of at least one pigment selected from kaolin, delaminated kaolin, and talc, which is 5 to 15 μm, is 70 to 97 in terms of solid content relative to all pigments.
The polymer latex having a gel content of 5 to 50% as an adhesive is contained in an amount of 15 to 40% by weight based on the solid content, based on all pigments. Further, as the surface properties of the pigment coating layer, the glossiness according to JIS P8142 is 1 to 10
%, The smoothness according to JIS P8119 is 1 to 25
Seconds and surface roughness Ra according to JIS B0601
Is 2.0 to 6.0 μm. Matte coated paper having a texture of non-coated paper. 2. A non-hollow organic pigment having an oil absorption of 80 to 400 ml / 100 g is 3 to 14 with respect to all pigments in the coating layer.
The matte coated paper having a non-coated paper texture according to claim 1, which is contained in an amount of 1% by weight. 3. The pigment coating layer has an average particle size of 8 to 30 .mu.m.
The matte coated paper having a non-coated paper texture according to claim 1 or 2, wherein the polyolefin resin particles of m are contained in an amount of 2.5 to 5% by weight based on the total solid content of the pigment. 4. A base paper having a smoothness according to JIS P8119 of 0.5 to 20 seconds and a surface roughness Ra according to JIS B0601 of 3.2 to 7.0 μm is used as the base paper. A matte coated paper having a non-coated paper texture according to any one of claims 1 to 3.