JP2883139B2 - Manufacturing method of cast coated paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a method capable of producing cast coated paper having high quality with high efficiency.

2. Description of the Related Art Conventionally, as a method for producing a cast coated paper, a wet cast method in which a wet coated layer is pressed against the surface of a heating drum to give a gloss finish (for example, Japanese Patent Publication No. 28-3407, 38-2516)
No. 0), a gelling casting method in which the wet coating layer is brought into a gelled state and pressed against the surface of a heating drum to give a glossy finish (for example, Japanese Patent Publication Nos. 38-15751 and 40-7207, US Pat. No. 3,377,192).
No., JP-A-51-40410), a wet-coating layer is dried or semi-dried once, then plasticized by re-wetting and pressed against the surface of a heating drum (for example, US Pat. No. 2,759,847, JP-B-48-38005, JP-A-51-102111
No.) etc. are known.

In any of the methods for producing these cast coated papers, a base paper is provided with a coating layer mainly composed of a pigment and an adhesive, and while the coating layer is in a wet state, it is pressed against a heating drum surface having a mirror surface. It is common in that a mirror-finished surface is transferred to a plasticized coating layer to finish it as a coated paper having a smooth and high gloss.

Therefore, in the production of cast coated paper, it is necessary that the heating drum surface having a mirror surface be faithfully transferred to the paper surface in order to continuously perform a stable operation. It is absolutely necessary that no part of the coating layer remains on the surface of the heating drum when the mold is released. When a simple paint consisting only of pigment and adhesive is used and cast finish is performed on an untreated heating drum, after drying, the paper is difficult to release from the heating drum, and immediately after the start of operation, the coating layer A phenomenon called a so-called drum pick in which a part adheres to the heating drum, or paper sticks to the heating drum and paper breakage easily occurs, and satisfactory cast finishing cannot be performed.

Various proposals have been made as a method for improving the releasability of paper from the heating drum surface.

For example, the surface of a heating drum is previously treated with an oily substance such as fatty acid, fatty acid soap, sulfated castor oil, tributyl phosphate, xylene, terpene, monochlorobenzene, and the like.
A method of adding about 1.0% by weight has been proposed (U.S. Pat. No. 2,568,288, Japanese Patent Publication No. 28-3407).

In this method, an oil film is formed on the surface of the heating drum, and a part of the oil film is carried away in the process of drying and releasing the coating layer. A thick oil film is formed on the surface of the heating drum to maintain an apparent equilibrium and assist in paper release.

In addition, in order to improve the releasability in addition to the above oily substances,
A method has been proposed in which polyethylene, an alkyl phosphate, a higher fatty acid ester of sucrose, lecithin, a nonionic activator, an alkyl ketene dimer, or the like is added as a release agent to a paint, a gelling liquid or a rewetting liquid.

In these methods, the releasability changes depending on the cleanliness of the heating drum surface, and the drum surface gradually becomes dirty in about half a day, so that the releasability decreases and a cast coated paper having good quality is obtained. Can not be. Stop the machine each time,
Again, the drum surface must be treated with an oily substance, and no further long-term continuous operation is possible with these methods.

There is also a method of adding a large amount of the above oily substance to a cast coating liquid, a gelling liquid or a re-wetting liquid in order to improve the releasability, but in this case, generally, as the releasability is improved, However, there is a problem that gloss, which is the biggest selling point of cast coated paper, tends to decrease, and at the same time, printability also decreases.

Further, as a method of inactivating the surface of the heating drum to improve the releasability, a method of treating the drum surface with acetic acid or nitric acid (US Pat. No. 2,943,954), a methyl silicone resin (US Pat. No. 3,088,883), polyethylene, polypropylene ,
Coating the surface of a drum with a synthetic resin such as polystyrene, polyester, polyethylene terephthalate, polyisobutylene, fluorine resin, silicon resin, polyacryl resin, polyvinyl chloride, etc. (JP-B-35-8105, JP-B-35-11301) And Japanese Patent Publication No. 35-13705).

Although the above method may show good releasability, the quality of the cast coated paper such as glossiness and shine is inferior,
In addition, there is a problem that the surface treatment method of the drum is difficult, and it has not been put to practical use.

Other methods include hydrophobic coating on the surface of pigments used in paints, use of calcium carbonate or plastic pigments with good air permeability, or latex used as an adhesive in paints, vinyl acetate and vinyl stearate. A method using a copolymer of the above, vinyl acetate, or a latex copolymerized with acrylonitrile has been proposed, but long-term continuous operation is difficult with either method.

In particular, when satin white is contained in the coating layer as a pigment, the releasability is further deteriorated, and there is a problem that stable continuous operation for more than half a day is difficult in any method.

Therefore, in any of the prior arts, there is no method capable of stably and continuously operating a cast coated paper having a high gloss for a long time, so that the productivity of the cast coated paper is significantly reduced. Is the current situation.

"Problems to be Solved by the Invention" The present invention provides a method for stably and continuously producing cast coated paper having high quality for a long time.

"Means for Solving the Problems" The present invention provides a coating layer mainly composed of a pigment and an adhesive on a base paper, and applies the coating layer having a specular gloss to the surface of a heating drum having a wet gloss while the coating layer is in a wet state. A method for producing a cast coated paper, which has a high gloss finish by pressing, wherein one or more fluorine-containing surfactants are contained in the coating layer.

"Action" The present inventors have focused on a release agent added to the cast coating layer in order to continuously operate high-quality cast coated paper for a long time, and as a result of intensive research, as a result, It has been found that by including a fluorine-containing surfactant in the cast coating layer, continuous operation can be performed for a long time and a high-quality cast coated paper can be obtained, and the present invention has been completed.

That is, in the method for producing a cast coated paper of the present invention, a fluorine-containing surfactant, more preferably the following general formula [1], [2], [3], [4] or [ 5].

_Rf represents a perfluoroalkyl group or a perfluoroalkenyl group having 4 to 20 carbon atoms, and a part of fluorine atoms may be substituted with a hydrogen atom. n is an integer of 1 to 3, M is an alkali metal, alkaline earth metal, zinc, ammonium salt, amine, hydrogen atom, or 1 to 20 carbon atoms.
Represents an alkyl group. Z is a divalent bridging group bonded to the carbon atom of R _f and the oxygen atom of the phosphate group. m represents an integer of 0 or 1. As an example of Z: Or (Where i is an integer of 1 to 20, j is an integer of 0 to 50, and R is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms).

The following is mentioned as a specific example of the general formula [1].

R _f -Y _m -SO _{3 M} (2) R _f, m and M are as defined in [1]. Y is a divalent bridging group bonded to a carbon atom and a sulfur atom of R _f . As an example of Y, —CH ₂ OCH ₂ CH ₂ O _{i and the} like. (Here, i represents an integer of 1 to 20.) Specific examples of the general formula [2] include the following.

C ₅ F ₁₁ SO ₃ Na, C ₆ F ₁₃ SO ₃ K, C ₆ F ₁₃ SO ₃ NH ₄ , C ₈ F ₁₇ SO ₃ Li, C _{7
F 15 SO 3 N (C 2} H 5) 4, C 4 F 9 SO 3 Na, _{C 11 F 23 CH 2 OCH 2} CH 2 O 7 SO 3 Na.

R _f -U _m -COOM (3) R _f, m and M are as defined in [1].

U is a divalent bridging group bonded to the carbon atom of R _{f and} the carbon atom of the carboxylic acid group. As an example of U, And so on. (Where i represents an integer of 1 to 20, R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.) Specific examples of the general formula [3] include the following. That is, C ₇ F ₁₅ COONH ₄ , H (CF ₂ ) ₉ COONa, And so on.

R _f and m are the same as those in [1], and R ₁ , R ₂ and R ₃ are a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a hydroxyalkyl group, a cycloalkyl group, or a C 7 to 15 Is an aralkyl group. X is a halogen _{atom, OH, HSO 4, CH 3} -S
O ₄ , CH ₃ COO or H ₂ PO ₄ , And the like. V is a divalent bridging group bonded to the carbon and nitrogen atoms of _Rf . As an example of V, Or And so on. (Where i is an integer of 1 to 20, j is an integer of 1 to 50, R is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.) Specific examples of the general formula [4] are as follows. Are included.

_{C 7 F 15 -OCH 2 CH 2} O 10 CH 2 CH 2 N + (CH 3) 3 I -, _{C 8 F 17 SO 2 NH (} CH 2) 3 N + (CH 3) 2 (C 2 H 4) Br -, _{C 5 F 11 SO 2 NHCH 2} 3 OCH 2 2 N + (CH 3) 3 I -, R _f , V and m are the same as above.

R ₄ and R ₅ are the same as R ₁ and R _3. A is, COO or a SO _3. m represents an integer of 0 or 1.

 q is an integer of 1 to 4.

Specific examples of the general formula [5] include the following.

_{C 8 F 17 OCH 2 CH 2} O 10 (CH 2) 2 N + (CH 3) 2 (CH 2) 3 COO -, _{C 6 F 13 SO 2 NH (} CH 2) 3 N + (CH 3) 2 (CH 2) 3 SO 3 -, _{C 7 F 15 SO 2 NH (} CH 2) 3 O (CH 2) 2 N + (CH 3) 2 CH 2 COO -.

Furthermore, the above general formulas [1] to
Specific examples of the fluorinated surfactant other than [5] include the following.

C ₈ F ₁₇ CH ₂ CH ₂ O ₄ CH ₂ CH ₂ C ₈ F ₁₇ , C ₉ F ₁₉ CH ₂ CH ₂ SCH ₂ CH ₂ OCH ₂ CH ₂ O ₄ −CH ₂ CH ₂ SCH ₂ CH ₂ C ₉ F ₁₉ , _{C 7 F 15 CH 2 OCH 2} CH 2 O 9 H, C 12 F 25 CH 2 OCH 2 CH 2 O 20 H, CF 3 C (C 2 F 5) 2 C (CF 3) = C (CF 3) - _{OCH 2 CH 2 O 15 CH 3} , C 6 F 13 CH 2 CH 2 OH, C 8 F 17 OCH 2 CH 2 O 15 CH 3.

Representative specific examples of the fluorinated surfactant used for the cast coating layer include those described above,
The invention is of course not limited to these.

In general, fatty acids as mold release agents for molding plastics, etc.
Paraffin, natural waxes, silicon compounds, fluorine compounds, etc. are widely used, but these generally improve the printability, such as the gloss of cast coated paper and the ink adhesion, when the release property is improved. It tends to decrease.

Under the specific conditions of production of the cast coated paper intended for the present invention, that is, the base paper is basically coated with an aqueous coating liquid containing a pigment and an adhesive as a main component, and the coated layer is in a wet state. When pressed against the surface of the cast drum heated during this time, the coating layer must be properly adhered to the cast drum, and then must be released from the cast drum after the coating layer has dried. In order to satisfy the conditions, only the fluorinated surfactant of the present invention can obtain particularly stable continuous operability as a release agent in the cast coating layer, and the glossiness and printability are reduced. And excellent cast-coated paper can be obtained.

The effect of the fluorinated surfactant used in the present invention as described above is not necessarily clear, but the perfluoroalkyl group or perfluoroalkenyl group of the fluorinated surfactant is present on the surface of the cast coating solution. To lower the gloss of cast coated paper by lowering the tension more efficiently than conventionally known release agents and applying special release conditions to the cast coated layer, such as the production of cast coated paper. Without releasing, it is possible to improve the releasability, furthermore, the hydrophilic group of the surfactant gives the surfactant an appropriate hydrophilicity, the distribution of the surfactant in the coating layer becomes uniform In addition, it is possible to control the release unevenness, etc., and to improve the poor ink inking property of the resulting cast coated paper, thereby enabling unprecedented long-term continuous operation of high quality cast coated paper. Presumed.

As described above, the present invention has revealed for the first time that the use of the above-mentioned fluorine-containing surfactant in a cast coating layer improves long-term continuous operability.

Further, compounds having a hydrophilic group represented by the above general formulas [1] to [5] are more preferably used because they have excellent compatibility with cast coating liquids, and exhibit excellent effects. .

As a method of adding the fluorinated surfactant to the cast coating layer, it may be added to the cast coating solution, or, in the case of the rewet casting method or the gelling casting method, may be added to the rewet liquid or the gelling liquid. The fluorinated surfactant is often directly or after previously dissolved in water or an organic solvent, and then added to the cast coating layer, the rewet liquid, or the gelling liquid.

The content of the fluorine-containing surfactant in the cast coating layer is preferably 0.01 to 10 parts by weight, more preferably 0.05 to 5 parts by weight, based on 100 parts by weight of the pigment. .

By the way, when the amount is less than 0.01 part by weight, sufficient releasability cannot be obtained, and when the amount exceeds 10 parts by weight, the cast coated layer in which the cast coated layer is in a wet state is pressed against a cast drum. Since the adhesion of the cast coating layer to the cast drum is poor, unevenness in gloss and a decrease in gloss on the surface of the cast coated paper are observed.

When added to the rewetting liquid or the gelling liquid, 0.001 to 5% by weight, more preferably 0.01 to 1% by weight.
It is good to adjust and use within the range.

The solvent used to dissolve the fluorinated surfactant is not particularly limited, but water or an organic solvent, a mixture of water and an organic solvent, or a mixture of organic solvents is used.

Examples of the organic solvent include alcohols such as methanol, ethanol, propanol and isopropanol, ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone, ethers such as ethyl ether, isopropyl ether, dioxane, and etrahydrofuran, and ethyl acetate. And esters such as butyl acetate, and halogenated hydrocarbons such as dichloromethane, trichloroethane, chloroform and trichlorofluoromethane.

In addition, fatty acids such as stearic acid, oleic acid, palmitic acid and the like, salts thereof such as sodium, potassium, calcium, ammonium, zinc, etc., as sulfates in a coating composition, a re-wetting liquid, or a gelling liquid. Oily substances such as castor oil, hydrocarbon surfactants, polyethylene waxes, alkyl phosphates, higher fatty acid esters of sucrose, lecithin and the like, may be used in combination with the above-mentioned fluorine-containing surfactants. The mixing ratio is adjusted in the range of 0.01 to 100 parts by weight, more preferably 0.1 to 10 parts by weight, based on 1 part by weight of the fluorine-containing surfactant.

In addition, the surface of the cast drum used for the casting finish may be a fluorine-containing surfactant, or a fatty acid, a fatty acid soap, a sulfated castor oil, a natural wax such as carbana wax,
It may be coated with an oily substance such as paraffin wax or silicone oil or a hydrocarbon-based surfactant.

Thus, in the present invention, a cast coated paper is produced by using the cast coated composition containing the above specific fluorine-containing surfactant.

The base paper for cast coated paper is not particularly limited, and acid paper or neutral paper generally used in the field of cast coated paper is applied. Incidentally, one or both sides of the base paper may be preliminarily coated with a general pigment coating composition if necessary, and the coating amount in that case is about 5 to 30 g / m ^{2 in} dry weight per side. preferable.

Further, the coating composition for the cast coating layer is not particularly limited, and a coating composition containing a pigment and an adhesive as main components generally used in the field of cast coated paper can be applied. is there.

As the pigment, one or more pigments for general coated paper such as clay, kaolin, aluminum hydroxide, calcium carbonate, titanium oxide, barium sulfate, zinc oxide, satin white, and plastic pigment are appropriately used. .

In addition, as the adhesive, starch, modified starch, casein,
Generally used for aqueous coating compositions such as natural adhesives such as soy protein and protein, styrene-butadiene copolymer latex, acrylic emulsion latex, butadiene-acrylonitrile copolymer latex, and synthetic adhesives such as polyvinyl alcohol One or more of various natural and synthetic adhesives are used in appropriate combination.

In general, the amount of the adhesive used is adjusted in the range of 5 to 50 parts by weight, more preferably 10 to 30 parts by weight, based on 100 parts by weight of the pigment.

Further, various assistants such as a dispersant, a water-proofing agent, a preservative, a dye, an antifoaming agent, and a flow modifier can be appropriately added to the coating composition, if necessary.

Thus obtained coated composition, an air knife coater onto a base paper, a blade coater, a brush coater, a roll coater, by a suitable coated device such as a size press to a dry weight becomes about 5~35g / m ² After the coated layer contains water and is in a plasticized state while being in a plastic state, it is pressed against the heating drum surface specified in the present invention and dried, and after the water in the coated layer is substantially evaporated, the drum is dried. And a cast coated paper is obtained.

As a method for finishing such a cast coated paper, conventionally known various methods such as a wet casting method, a re-wetting casting method, and a gelling casting method can be directly carried out.

"Examples" Hereinafter, the present invention will be described in more detail, but is of course not limited thereto. Unless otherwise specified, parts and% in examples are parts by weight and% by weight, respectively.

Example 1 70 parts of kaolin, 25 parts of light calcium carbonate, 5 parts of satin white, and 0.5 part of sodium polyacrylate were dispersed in water using a Cores disperser to prepare a pigment slurry having a solid content of 60%.

Compound 1 shown in Table 1 as a release agent was added to this slurry.
0.5 parts, 0.5 parts of tributyl phosphate as an antifoaming agent,
10 parts of a 15% aqueous casein solution (solid content) dissolved with ammonia as an adhesive and 25 parts (solid content) of a styrene-butadiene copolymer latex were added, and 4 parts of ZnSO ₄ and water were further added to obtain a solid content. A coating liquid for casting having a concentration of 45% was prepared, and was subjected to a cast finish by a re-wet cast method using the apparatus shown in FIG.

That is, the cast coating solution prepared as described above is
The g / m ² base paper for casting (1) was coated with an air knife coater (2) to a dry weight of 20 g / m ² and dried with an air floating dryer (3).

Next, this coated paper is pressed into a press roll with a diameter of 750 mm (4).
And a press nip (6) formed by a cast drum (5) having a 1500 mm diameter chrome-plated mirror surface gloss treated with stearic acid, and a nozzle (7)
From the surface of the coating layer with a rewet liquid (0.5% concentration) composed of polyethylene emulsion supplied from
After pressing and drying at 00Kg / cm, take-off roll (8)
To give a cast coated paper (9). The operation speed at this time was 80 m / min.

Example 2 A cast coated paper was obtained in the same manner as in Example 1, except that 0.05 parts of Compound 4 was used instead of Compound 1 in Table 1 as a release agent to be added to the cast coating liquid. Was.

Example 3 A cast coated paper was obtained in the same manner as in Example 1 except that 1.0 part of Compound 8 was used instead of Compound 1 in Table 1 as a release agent to be added to the cast coating liquid. Was.

Example 4 A cast coated paper was obtained in the same manner as in Example 1, except that 0.5 parts of Compound 10 was used instead of Compound 1 in Table 1 as a release agent to be added to the cast coating liquid. Was.

Example 5 A cast coated paper was obtained in the same manner as in Example 1 except that 5.0 parts of Compound 14 was used instead of Compound 1 in Table 1 as a release agent to be added to the cast coating liquid. Was.

Example 6 In Example 1, 0.1 part of Compound 1 was replaced with 0.1 part of calcium stearate as a release agent instead of 0.5 part of Compound 1.
A cast coated paper was obtained in the same manner as in Example 1 except that 0.9 parts of the mixture was used.

Example 7 A cast coated paper was obtained in the same manner as in Example 1 except that a mixture of 0.05 part of compound 1 and 0.25 part of compound 7 was used instead of compound 1 as a release agent.

Example 8 In Example 1, calcium stearate was used in place of Compound 1 in Table 1 as a release agent to be added to the cast coating solution.
A cast-coated paper was obtained in the same manner as in Example 1 except that% was added.

Example 9 A cast coated paper was obtained in the same manner as in Example 8, except that 1.0% of Compound 7 was added instead of Compound 2 in Table 1.

Example 10 A cast coated paper was obtained in the same manner as in Example 8, except that 2.0% of Compound 12 was added instead of Compound 2 in Table 1.

Example 11 In Example 1, the compound 3 of Table 1 was added to the rewet solution at a concentration of 0.2%.
A cast coated paper was obtained in the same manner as in Example 1 except that 5% was added.

Comparative Example 1 A cast coated paper was obtained in the same manner as in Example 1, except that 2.0 parts of calcium stearate was used instead of Compound 1 in Table 1.

Comparative Example 2 A cast coated paper was obtained in the same manner as in Comparative Example 1, except that 2.0% of ammonium oleate was added to the rewet liquid.

Comparative Example 3 A cast coated paper was obtained in the same manner as in Example 1 except that silicone oil was used instead of compound 1 in Table 1.

Table 2 shows the continuous operation time in Examples 1 to 11 and Comparative Examples 1 to 3 and the quality results of the obtained cast paper.

Example 12 A pigment slurry having a concentration of 70% was obtained by dispersing 75 parts of kaolin, 15 parts of light calcium carbonate, 5 parts of aluminum hydroxide, 5 parts of satin white, and 0.5 parts of polyacrylic acid sodium as a dispersant using a Coreless disperser in water. Was prepared. 0.5 part of tributyl phosphate as an antifoaming agent, 1.0 part of compound 2 in Table 1 as a releasing agent, 15 parts of a 15% aqueous casein solution (solid content) dissolved in aqueous ammonia as an adhesive, styrene / butadiene copolymer 14 parts (solid content) of the combined latex and water were added to obtain a coating liquid having a concentration of 55%.

Using this cast coating solution, cast finishing was performed by a gel casting method using the apparatus shown in FIG.

That is, the cast coating solution prepared as described above is
g / m ² base paper for casting (10) is coated with a roll coater (11) to a dry weight of 20 g / m ² ,
The coating layer was gelled by contact with a 5% aqueous solution of calcium formate (12).

Next, this paper was pressed against a cast drum (14) (surface temperature of 90 ° C.) (surface temperature: 90 ° C.) with a press linear pressure of 180 kg / cm and dried by a take-off roll (15). It was peeled off from the cast drum to obtain a cast coated paper (16). The operating speed at this time is 60m /
Minutes.

Example 13 Compound 5 was used in place of Compound 2 in Table 1 as a mold release agent.
A cast-coated paper was obtained in the same manner as in Example 12 except for using some parts.

Example 14 Compound 7 was added to the release agent in the place of Compound 2 in Table 1 for 0.5 part.
A cast-coated paper was obtained in the same manner as in Example 12 except for using some parts.

Example 15 Compound 15 was used in place of Compound 2 in Table 1 as a release agent.
A cast-coated paper was obtained in the same manner as in Example 12 except for using some parts.

Example 16 As a release agent, lecithin was added in place of compound 2 in Table 1 to 1.0.
Of the compound 6 in Table 1 in the gelling solution.
A cast-coated paper was obtained in the same manner as in Example 12 except that the addition was performed so as to be as follows.

Example 17 A cast coated paper was obtained in the same manner as in Example 16 except that 0.5% of the compound 13 in Table 1 was used instead of the compound 6 in the gel solution.

Example 18 In the same manner as in Example 12, except that Compound 1 of Table 1 was used instead of Compound 2 as a release agent, and Compound 11 of Table 1 was added to the gelling solution so as to have a concentration of 0.5%. A cast coated paper was obtained.

Comparative Example 4 A cast coated paper was obtained in the same manner as in Example 12, except that 5.0 parts of lecithin was used instead of Compound 2 as a release agent.

Comparative Example 5 A cast coated paper was obtained in the same manner as in Example 12, except that 0.5 parts of silicone oil was used instead of Compound 2 as a release agent.

Table 3 shows the continuous operation time and the quality results of the cast paper obtained in Examples 12 to 18 and Comparative Examples 4 and 5.

Example 19 As a coating liquid for casting, 80 parts of kaolin, 15 parts of light calcium carbonate, 5 parts of satin white, 15 parts of 15% aqueous casein solution (solid content), acrylic acid / butadiene / methyl methacrylate (ratio: 2/33 / 65) Prepare a 53% concentration coating liquid consisting of 15 parts (solid content) of copolymer latex and 0.7 part of compound 3 in Table 1, and finish casting by wet casting method using the apparatus shown in FIG. Was performed.

That is, the cast coating solution prepared as described above is
g / m ² of a casting base paper (17) by a first coater (18) so as to have a dry weight of 10 g / m ^2, and then while the coating layer is in a wet state. In the second coater (19), the same cast coating solution as described above was applied to a dry weight of 10 g / m ^2, and the paper was immediately surface-treated with stearic acid on a 800 mm diameter press roll (20). Then, it was pressed against the cast drum (21) (surface temperature: 80 ° C.), dried, and peeled from the cast drum to obtain a cast coated paper (22). The operating speed at this time was 70 m / min.

Example 20 Compound 6 was used in place of Compound 3 in Table 1 as a mold release agent.
A cast-coated paper was obtained in the same manner as in Example 19, except for using some parts.

Example 21 Compound 9 was used in place of Compound 3 in Table 1 as a release agent.
A cast-coated paper was obtained in the same manner as in Example 19, except for using some parts.

Example 22 Compound 11 was used in place of Compound 3 in Table 1 as a release agent in the amount of 1.0.
A cast-coated paper was obtained in the same manner as in Example 19, except for using some parts.

Example 23 Compound 13 was used in place of Compound 3 in Table 1 as a mold release agent.
A cast-coated paper was obtained in the same manner as in Example 19, except for using some parts.

Example 24 Compound 16 was used in place of Compound 3 in Table 1 as a release agent.
A cast-coated paper was obtained in the same manner as in Example 19, except for using some parts.

Comparative Example 6 In place of compound 3 in Table 1, stearic acid 5.
A cast coated paper was obtained in the same manner as in Example 19 except that 0 part was used.

Comparative Example 7 Silicone oil was used as a release agent instead of compound 3 in Table 1.
A cast coated paper was obtained in the same manner as in Example 19 except that 1.0 part was used.

Table 4 shows the continuous operation time and the quality results of the cast coated paper obtained in Examples 19 to 24 and Comparative Examples 6 and 7.
It was shown to. In addition, operability and quality evaluation were performed based on the following criteria.

(Continuous operation time) It is the time from the start of the operation until the drum pick occurs or the paper is stuck to make a satisfactory product impossible.

In this example, in order to evaluate continuous operability,
Using a cast coating composition having a low release property,
The continuous operability of the cast coated paper in this case is approximately 12
The evaluation of continuous operation was completed in 12 hours because it was possible to determine the presence or absence of a drum pick and the release state after a time.

(Gloss of Cast Surface) The gloss of the cast finished surface was measured according to the JIS P8142 method.

(Ink adhesion) Printed by RI printing tester (Meiji Seisakusho)
After leaving for a time, the peeling of the ink was examined with a cellophane tape and evaluated based on the following criteria.

；: Good ink deposition property ×: poor ink deposition property “Effect” The cast coated paper obtained in the examples of the present invention has the following properties.
2. As is evident from the results in Tables 3 and 4, cast coated papers having a high cast surface gloss and excellent cast quality could be obtained with high efficiency.

[Brief description of the drawings]

FIGS. 1, 2 and 3 are schematic diagrams showing a method of producing a cast coated paper used in Examples and Comparative Examples of the present invention. (1), (10), (17): Base paper (unwinder) (2): Air knife coater (3): Air floating dryer (4), (13), (20): Press roll (5), ( 14), (21): Cast drum (6): Press nip (7): Rewetting liquid supply nozzle (8), (15): Take-off roll (9), (16), (22): Cast coating Paper (11): Roll coater (12): Gelling solution (18): First coating device (19): Second coating device

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D21H 1/22-1/28

Claims (6)

(57) [Claims] 1. A cast for providing a coating layer containing a pigment and an adhesive as a main component on a base paper, and pressing the surface of the heating drum having a specular gloss while the coating layer is in a wet state to finish the coating with high gloss. A method for producing a coated coated paper, characterized in that the coated layer contains one or more fluorine-containing surfactants. 2. The method for producing a cast-coated paper according to claim 1, wherein the fluorine-containing surfactant is a compound represented by the following general formula [1]. R _f is a C 4-20 perfluoroalkyl group or
Represents a perfluoroalkenyl group, linear, branched,
Any of a ring or a compound of them may be used.
Further, an oxygen atom may be contained in the main chain, and a part of a fluorine atom may be substituted with a hydrogen atom. n is an integer of 1 to 3, M is an alkali metal, an alkaline earth metal,
Zinc, ammonium salts, amines, hydrogen atoms, or alkyl groups having 1 to 20 carbon atoms. Z is a divalent bridging group bonded to the carbon atom of R _f and the oxygen atom of the phosphate group. m
Represents an integer of 0 or 1. 3. The method for producing a cast coated paper according to claim 1, wherein the fluorine-containing surfactant is a compound represented by the following general formula [2]. R _f -Y _m -SO _{3 M} (2) R _f, m and M are the same as in [1], Y is a divalent bridging group bound to a carbon atom and a sulfur atom of R _f. 4. The method for producing a cast coated paper according to claim 1, wherein the fluorine-containing surfactant is a compound represented by the following general formula [3]. R _f -U _m -COOM [3] R _f , m and M are the same as in [1], and U is a divalent bridging group bonded to the carbon atom of R _{f and} the carbon atom of the carboxylic acid group. 5. The method according to claim 1, wherein the fluorine-containing surfactant is a compound represented by the following general formula [4]. R _f and m are the same as those in [1], and R ₁ , R ₂ and R ₃ are a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a hydroxyalkyl group, a cycloalkyl group, or a C 7 to 15 Is an aralkyl group. X represents a halogen atom, OH, HSO ₄ , CH ₃ SO ₄ ,
H ₂ PO ₄ , CH ₃ COO, And the like. V is a divalent bridging group bonded to the carbon and nitrogen atoms of _Rf . 6. The method for producing a cast-coated paper according to claim 1, wherein the fluorine-containing surfactant is a compound represented by the following general formula [5]. R _f and m are the same as for (1), R ₄ and R ₅ are the same as R ₁ to R _3. A is COO or SO _3,. V is a divalent bridging group bonded to the carbon and nitrogen atoms of _Rf . q
Is an integer from 1 to 4.