JPH03213595A - Production of cast-coated paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Field of Application" The present invention provides a method for producing high-quality cast coated paper with high efficiency.

``Prior Art'' Conventionally, methods for producing cast coated paper include the wet casting method (for example, Japanese Patent Publication No. 3407/1986, 31
3-25160), a gel casting method in which the wet coating layer is gelled and brought into contact with the heating drum surface for a glossy finish (for example, Japanese Patent Publication No. 38-15751, 40-7).
No. 207, U.S. Patent No. 3,377,192, Japanese Patent Application Laid-Open No. 1983-4
No. 0410), a rewet casting method in which the wet coating layer is once dried or semi-dried, then plasticized by rewetting and pressed against the heated drum surface (for example, US Pat. No. 2759).
No. 847, Japanese Patent Publication No. 48-38005, Japanese Patent Publication No. 51-1
02111) etc. are known.

In all of these methods of producing cast coated paper, a coating layer mainly composed of pigment and adhesive is provided on a base paper, and while the coating layer is in a wet state, the coating layer is pressed against a heating drum surface having a mirror surface. They have in common that they produce a coated paper that is smooth and highly glossy by copying a mirror surface onto the coated layer that is in a plastic state.

Therefore, in the production of cast coated paper, in order to perform continuous and stable operations, it is necessary that the heated drum surface, which has a mirror surface, be faithfully transferred to the paper surface. It is absolutely necessary that not even a part of the coating layer remains on the surface of the heating drum when it is released from the mold. If a simple paint consisting of pigment and adhesive is used and cast on an untreated heated drum, after drying,
The paper is difficult to release from the heating drum, and immediately after the start of operation, a part of the coating layer adheres to the heating drum, a phenomenon called drum pick, and the paper sticks to the heating drum, resulting in paper breakage. Yazu (Unable to achieve a satisfactory cast finish.

Various proposals have been made to improve the releasability of paper from the heated drum surface.

For example, pre-heated drum surface can be heated with fatty acids, fatty acid soap, etc.
Treated with oily substances such as sulfated castor oil, I-butyl phosphate, xylene, terpene, and monochlorobenzene, and furthermore contain 0.1 to 0.1% of these oily substances in the paint used.
A method of adding about 1.0% by weight has been proposed (US Pat. No. 2,568,288, Japanese Patent Publication No. 3407/1983).

In this method, an oil film is formed on the surface of the heating drum, and as the coated layer dries and is released from the mold, some of the oil film is carried away. A thick oil film is formed on the surface of the heated drum to maintain an apparent equilibrium and aid in paper release.

In addition to the above-mentioned oil-based substances, polyethylene, alkyl phosphates, sucrose higher fatty acid esters, lecithin, nonionic activators, A method of adding an alkyl ketene dimer etc. has been proposed.

In these methods, the releasability changes depending on the cleanliness of the heating drum surface, and as the drum surface gradually becomes dirty in about half a day, the releasability decreases, making it difficult to obtain cast coated paper with good quality. I won't be able to do it.

Each time, the machine must be stopped and the drum surface must be treated again with an oily substance, and longer continuous operation is not possible with these methods.

There is also a method of adding a large amount of the above-mentioned oil-based substances to the casting coating liquid, gelling liquid, or rewetting liquid in order to improve the mold release property, but this method improves the mold release property for boat fishing. As a result, the gloss, which is the most important selling point of cast coated paper, tends to decrease, and at the same time, there are drawbacks such as a decrease in printability.

Furthermore, as a method of inactivating the heating drum surface and improving mold release properties, a method of treating the drum surface with acetic acid or nitric acid (
Synthesis of methyl silicone resin (US Patent No. 3,086,883), polyethylene, polypropylene, polystyrene, polyester, polyethylene terephthalate, polyisobutylene, fluororesin, silicone resin, polyacrylic resin, polyvinyl chloride, etc. Method of coating the surface of the drum with resin, etc.
-8105, Special Publication No. 11301, Special Publication No. 11301, Special Publication No. 1973
-13705) has been proposed.

In some cases, the above method shows good mold release properties, but there are problems such as the quality of the white cast coated paper, such as gloss and shine, is poor, and the surface treatment method of the drum is difficult, so it cannot be put into practical use. It has not been.

Other methods include applying hydrophobic coating to the surface of pigments used in paints, using breathable calcium carbonate or plastic pigments, and adding vinyl acetate and vinyl stearate to latex used as adhesives in paints. Methods have been proposed that use a copolymer of , or a latex copolymerized with hinyl acetate or acrylonitrile, but with either method, long-term continuous operation is difficult.

In particular, when Sachin White as a pigment is included in the coating layer, the mold releasability becomes even worse, and no matter which method is used, stable continuous operation for more than half a day is difficult.

Therefore, in any of the conventional techniques, there is no method that can stably and continuously operate cast-coated paper with high gloss over a long period of time, which significantly reduces the productivity of cast-coated paper. 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 of high quality over a long period of time.

"Means for Solving the Problems" The present invention provides a coating layer mainly composed of pigment and adhesive on a base paper, and while the coating layer is in a wet state, the heating drum surface having a specular gloss is coated. A method for producing cast-coated paper that is press-contacted to give a high-gloss finish, characterized in that the coating layer contains one or more types of fluorine-containing surfactants.

"Function" In order to continuously operate high-quality cast-coated paper for long periods of time, the inventors of the present invention focused in particular on the release agent added to the cast-coated layer, and as a result of extensive research, a specific The present inventors have discovered that by incorporating a fluorine-containing surfactant into the cast coating layer, long-term continuous operation is possible and high quality cast coated paper can be obtained, and the present invention has been completed.

That is, in the method for producing cast coated paper of the present invention,
The coating layer is characterized by containing a fluorine-containing surfactant, more preferably one or more compounds represented by the following general formulas [1], [2], [3], [4] or [5]. That is.

1 (R, -Z, -0), -PJOM): +-n (
1) R represents a perfluoroalkyl group or a perfluoroalkenyl group having 4 to 20 carbon atoms, and some of the fluorine atoms may be substituted with hydrogen atoms. n is 1
an integer of ~3, M is an alkali metal, an alkaline earth metal,
Indicates zinc, ammonium salt, amines, hydrogen atom, or alkyl group having 1 to 20 carbon atoms. Z is a divalent crosslinking group bonded to the carbon atom of R7 and the oxygen atom of the phosphoric acid group.

m represents an integer of 0 or 1. As an example of Z, +CH2-+i, -0@-! CI+2-)-r.

RR -(-CH2-CHos7CHz-CH-1RRR 8O□-N+CHz-CHO+JCHz-CHR C-N +CIl□-CH0廿CHz-CH+CH2
+tN (-CH2-CI(0-)-Ding CH□-CH0RR -C-0(-CH2-CIO廿CH2-CH-1RR + CHz +60 + CHz-CHO"jr C
Hz-CH or ORRR + CHz+i C-N +CHz-CHO 斤CH2
-Cl+ (herein, 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).

Specific examples of general formula [1] include the following.

C6F + acHzcHzOP (OH)z, Cl
0FZICH20+CHzCHzOh P(OH)2,
CaF + vcHzcHzOP (ONa) z, (
C8FI7CH2C)120)2POH.

CH30 C7F I 5CH20P (ONa) z, CJ'+
5CHz-CH-OP(OH)z, 2H5 C6P IzsO□N-CH2Cl+20P(OK)
2, 2115 C, F, 3SO□N-CH2CH2OP (01()
2, zHs C3FI? 5O2N + CHzCtlzOhoP (ONa) 2, 3 Js CH3 C8F, 7So□N-CH2CH2O + C112CH-0+TaP (Oll) z, OC
21(5 (C7F15C-N-CH2CH2OhP-OH.

113 (CsF I lCH2CH2N-CH2CH2OhP
-ONH4, (C4F, CH2CH2-0→3P.

+CF2su, CHzP-OzCa.

C8F+7-C-0 + C112C1120-piece P-(0-Nl14) 2
, 4 C1h O C+oFz+Cl1z-0+ CH2Cl-OhoP(
ONa)z, CH30 C+oPz+ + CHz hc-N + CHzCH
z KanohP (OK) zRt YII 503M
(2) Rf, , m and M are the same as [1]. Y is a divalent bridging group bonded to the carbon atom and sulfur atom of Rf. Examples of Y include C-0+ Cth h or CH2O+ CH2CH2O. (Here, i represents an integer of 1 to 20.) Specific examples of general formula [2] are as follows.

C5F11SOJa, CbP+zSO3K C6F
I3SO3Nl+4, CeF+7SO+Li, C7F
ISSO:IN(C2H4)4,C4FqSOJa,C
7F+sO@-3OJa, C7F+sO@-3O3N
H4, 5 CloFz, o%so3, C7F+sO@(CHz
)+5OJa.

Cl lF23CI+20 + Cl12CI+20
isO4, NaR, -Uffl-COOM
(3) R4, m and M are the same as [1].

U is a divalent bridging group bonded to the carbon atom of Rf and the carbon atom of the carboxylic acid group. Examples of U include R C-N-(-CH2 or -N(-CH2), etc. (where i is an integer of 1 to 20, R is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms) Specific examples of general formula [3] include the following: C7F 15GOONH4, H(CF 2) qcOO
Na.

2H5 C1°F21 (CH2) 1lc0ONH4, C6F
, 350□N-CHzCOOK.

6 3H7 CzHs Cal'+7SOzN-C11zCOONa.

(CtF+5C-N-CHzCOO)zCa.

C3H7C5H7 C6F+3-N-Cll2COONa, C81”+7
SO2N-CJIzCOOCztls, etc.

R.

\3 R, and m are the same as in [1], R4, R2 and R3 are a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a hydroxyalkyl group, a cycloalkyl group,
Or it is an aralkyl group having 7 to 15 carbon atoms. X is a halogen atom, OH, HS 04 , CH2SO4, CH
, COO or [■2PO4,7 and a divalent bridging group bonded to the nitrogen atom. Examples of (2) are R C-N −+ C1 (2) or SO□-N (-CIIZ70 (-CH2), etc.

(Here, i is an integer from 1 to 20, j is an integer from 1 to 50, R
represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. ) Specific examples of general formula [4] include the following.

8 C+oFz+O-@5OzNH-CHzCFIJ +(
C#a)sc]C7F+5-0 (-CIIzCHzO-)-'rocHzcHzN"
(CIl,)31(:aF+□C-NH -(-C) 12 3 N'' (CIlz)31 CH
3 C+oPz+C-N +C)lz h N" (CH3) 30H CIIP+7SOzN)l(CHz)J "(CIl3
)z(CJJBr C1l.

C7FI5SO2N +Cll2h N' (CH3)3I05FI l5
O2NI((-CI□++O+ Cl42-hN ”(
CIl3)3I C3FIISO2N)l + CH2hN"(CIL+
)303 S-@CH3, \5 R4, v and m are the same as above.

R4 and R9 are the same as R and R3.

A is coo or SO2. m represents an integer of 0 or 1.

q is an integer from ■ to 4.

Specific examples of general formula (5) include the following.

CtF+5C-NH(-CH2-h N'' ((:R
3) ZCH2COOCaF+tC-NH(Cl1z'
)= N ” (C13)z(CHz)3cO09 C6F + 30■CH,N ”” (CI(3) 2C82CO0 CaF+,O+ CHzCHzOsu1゜(Ctlz)J
”(CH3) z (CHz) 3COOC1゜pz
+o−@so□NH(CI□)3N′″(C1l+)z
(CI□)3SO3CbP+3SOzNH (GHz)
yN" (CH:+) z (CH2) 3SO3Ce
F + 7cmNH (-CHzt; N'' (C1(zcHzOH)z(
C1l□)3COOC9F, 90■SO□NH(CH
2) 3N ′″(CIl3)2 (CHz)2SO3C
7F + ssO□Nll (CHz) 30 (CH
2) zN ” (CH3) zcHzcO0 Furthermore,
Specific examples of fluorine-containing surfactants other than the above general formulas [1] to [5] that coat the surface of the heating drum include the following.

2nd 0 C2I+ 5 C+aFzrOiCtlzCII20)i+Il, C
3FIISO2N-(CIlzCIlzO)i5II,
Cl2F25G-0-(CHzCHzO)ioH.

C311゜C6FI33O□N ((:HzC)IzO) T11゜C5FI7o■coo℃I(zcHzohHzHs Cl13 C6FI33O□N-CH2CH20-(Hz(JI
O)'T'ilH.

CF3 C1h CF3 113 3H7 C, I7 C8F l 73O□N-(CH□CHzOhCIl□
CH2NC, F, □, C6H+ 3 Ct, Il+3 C6F + 1sOzN-(CHzCHzOhoCHz
CIlzNSOzC6F + 3, C3Fl 7beCH
zCHzO)i CHzCIl□C8F+7, 3117 C311□ C7F, ,,CON -(-CI.CHzO)TCH
2CH2NCOC7F + s, C11zCHzO1l CIbCItzOIl C8F,, SO□NiCH2CH20) TICH2CH
2NSO□CeF 17, 0 1 C7F, 5G Kano (C112CH20)+. 0CC7FI
S, CF3 CF3 CIIF, 7CH□C11zNC11□C1 (20-C
I2CH2NCII□CIl□CBF+7, CF.

CF3 C:+FtO-CFCFzOCFCFz-C0℃11□
CHzOh-CF3 CF3 CCFzCFOCFzCF-QC: +F7, CF3 CF.

OC4119 C:1F70-CFCFZOCFCF2-C-N-(C
IIzCHzOh=4H9 CF3 CF3 CH2CH□N-CCFzCFOCFzCF-OC+F
7C7FISCH2CH2SCH2CH2C[CIIz
CHzO)tCCHzCHzSCH2CLC7F+ s
5 C7F, ,CH2CH□5C)12cH20beCl1
2CII□0)7-CH2O)12scH□CH2C9
FI9CHzCHzCH3(]:+C6F,,50□NC82CH2CH2N"(CH3
) zcll□CI□OR 5H7 C,F,7SO7N (CHzCIlzOH) zF3 (CF3CFZCF20) z-CFCON(CHzC
IIzOH) zC7F,,,C11□0 I℃11□CHz O)TI C+zFzsCHzO℃HzCllzO)mτ11CF
3C(C2F5) 2C(CF3)=C(CF3)-〇℃H2CH20)TT CH3, C6Fr:+CHzC
HzOH.

CeF+ 70 ((:HzClizO)=GoC113
6. Typical specific examples of the fluorine-containing surfactant used in the cast coating layer include those listed above, but the present invention is of course not limited to these.

In general, fatty acids, paraffin, natural one laths, silicone compounds, fluorine compounds, etc. are widely used as mold release agents for plastic molding. It tends to reduce printability such as paper gloss and ink receptivity.

Under the specific conditions of manufacturing cast coated paper, which is the object of the present invention, basically, a base paper is coated with an aqueous coating liquid mainly composed of pigments and adhesives, and this coating layer is in a wet state. When the coating layer is pressed against the heated cast drum surface while it is in the process, the coating layer sticks to the cast drum moderately, and then
In order to satisfy the contradictory condition that the coating layer must be reliably released from the cast drum after drying, only the fluorine-containing surfactant of the present invention can be used as a mold release agent in the cast coating layer. As a result, particularly stable continuous operation properties can be obtained, and excellent cast coated paper can be produced without deterioration in gloss, printability, etc.

Although the effects of the above-mentioned fluorine-containing surfactant used in the present invention are not necessarily clear, it is possible that the perfluoroalkyl group or perfluoroalkenyl group contained in the fluorine-containing surfactant is effective on the surface of the cast coating liquid. It lowers tension more efficiently than conventionally known mold release agents, and
By applying special release conditions to the cast coated layer, such as those used in the manufacture of coated paper, it is possible to improve the release properties without reducing the gloss of the cast coated paper. The hydrophilic group of the surfactant imparts appropriate hydrophilicity to the surfactant, making the distribution of the surfactant uniform in the coated layer, suppressing uneven mold release, etc., and improving the properties of the resulting cast coated paper. It is presumed that as a result of improvements in poor ink adhesion, etc., it has become possible to operate CAST 1-coated paper of unprecedented high quality over a long period of time.

As described above, the present invention has revealed for the first time that long-term continuous operability is improved by using the above-mentioned fluorine-containing surfactant in the cast coating layer.

Further, compounds having a hydrophilic group as shown in the above general formulas [1] to [5] are more preferably used because they have particularly good compatibility with the cast coating liquid and exhibit excellent effects. .

The fluorine-containing surfactant can be added to the cast coating layer by adding it to the cast coating liquid, or in the case of wet casting or gelling casting, adding it to the rewetting liquid or gelling liquid. Alternatively, the fluorine-containing surfactant may be added to the cast coating layer, rewetting solution, or gelling solution, either directly or after being dissolved in water or an organic solvent in advance.

The content of the fluorine-containing surfactant in the cast coating layer is adjusted within the range of 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. It's good to do that.

Incidentally, if the amount is less than 0.01 parts by weight, sufficient mold releasability cannot be obtained, and if it exceeds 10 parts by weight, when the cast coated paper with the cast coating layer in a wet state is pressed against the cast drum, In addition, due to the poor adhesion of the cast coating layer to the cast drum, uneven gloss and reduced gloss on the surface of the cast coating paper are observed.

In addition, when added to rewetting liquid or gelling liquid,
It is preferable to adjust the amount within the range of 0.001 to 5% by weight, preferably 0.01 to 1% by weight in the mold.

The solvent used to dissolve the fluorine-containing surfactant is not particularly limited, but may include water, an organic solvent,
Alternatively, a mixture of water and an organic solvent or a mixture of organic solvents may be used.

Examples of organic solvents include alcohols such as methanol, ethanol, propatool, and isopropatool;
Ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, ethers such as ether, isopropyl ether, dioxane, tetrahydrofuran,
Examples include esters such as ethyl acetate and butyl acetate, and halogenated hydrocarbons such as dichloromethane, trichloroethane, chloroform, and trichlorofluoromethane.

In addition, fatty acids such as stearic acid, oleic acid, and par-lumitic acid, and their salts such as thorium, potassium, calcium, ammonium, and zinc may be used as release agents in the coating composition, rewetting solution, or gelling solution. , oily substances such as sulfated castor oil, hydrocarbon surfactants, polyethylene waxes, alkyl phosphates, sucrose higher fatty acid esters, lecithin, and other conventionally known mold release agents are used in combination with the above fluorinated surfactants. The mixing ratio is 0.01 to 1 part by weight of the fluorine-containing surfactant.
00 parts by weight, more preferably 0.1 to 10 parts by weight.

In addition, the surface of the cast drum used for casting finishing can be coated with the fluorine-containing surfactant, fatty acids, fatty acid soaps, sulfated castor oil, natural waxes such as Karhanawanx, oily substances such as paraffin wax and silicone oil, or hydrocarbon-based interfaces. It may also be coated with an activator.

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

The base paper for cast coated paper is not particularly limited, and acidic paper or neutral paper that is generally used in the field of cast coated paper is applicable. In addition, if necessary, a general pigment coating composition may be pre-coated on one side or both sides of the base paper, and in that case, the coating amount is 5 to 30 g/rr'r in terms of dry weight per side. degree is preferred.

Furthermore, the coating composition for the cast coating layer is not particularly limited, and coating compositions containing pigments and adhesives as main components that are generally used in the field of cast coated paper can be applied. be.

Examples of pigments include clay, kaolin, aluminum hydroxide, calcium carbonate, titanium oxide, barium sulfate,
One or more types of general pigments for coated paper, such as zinc oxide, satin white, and plastic pigments, may be used as appropriate.

Adhesives include natural adhesives such as starch, modified starch, casein, soybean protein, and protein, synthetic adhesives such as styrene-butadiene copolymer latex, acrylic emulsion latex, butadiene-acrylonitrile copolymer latex, and polyvinyl alcohol. One or more types of various natural and synthetic adhesives generally used in aqueous coating compositions, such as adhesives, may be used in appropriate combinations.

The amount of adhesive used is generally adjusted within 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.

Furthermore, various auxiliary agents such as a dispersant, a waterproofing agent, a preservative, a dye, an antifoaming agent, and a flow modifier can be appropriately incorporated into the coating composition as required.

The coating composition thus obtained is coated onto base paper using an appropriate coating device such as an air knife coater, blade coater, brush coater, roll coater, or size press so that the dry weight is approximately 5 to 35 g/m. While the coating layer contains water and is in a plastic state, it is pressed against the heated drum surface specified in the present invention and dried, and after the moisture in the coating layer has substantially evaporated, the coating layer is removed from the drum. After releasing the mold, cast coated paper is obtained.

As a finishing method for such cast-coated paper, various conventionally known methods such as the 3-et cast method, the 1-cast method, and the gel cast method can be carried out as they are.

"Example" The present invention will be described in more detail below, but it is of course not limited thereto. In addition, unless otherwise specified, parts and % in the examples indicate parts by weight and % by weight, respectively.

Example 1 70 parts of kaolin, 25 parts of light calcium carbonate, 5 parts of Sachin White, and 0.5 parts of sodium polyacrylate were dispersed in water using a Coles disperser to prepare a pigment slurry with a solid content concentration of 60%.

Compound 1 shown in Table 1 was added to this slurry as a mold release agent.
．． 5 parts, tributyl phosphate 0.5 as antifoaming agent
10 parts (solid content) of a 15% casein aqueous solution dissolved using ammonia as an adhesive and 25 parts (solid content) of styrene-butadiene copolymer latex, and further Z
A coating liquid for casting having a solid content concentration of 45% was prepared by adding 4 parts of n5O<4 and water, and finishing was performed on Cast 1 using the rewet casting method using the apparatus shown in FIG.

That is, the cast coated paper prepared as described above was
g/m2 casting base paper (1) with a dry weight of 20 g
/ m 2 using an air knife coater (2) and drying using an air floating dryer (3).

Next, this coated paper was passed through a press drill (4) with a diameter of 750 mm.
The paper passes through a press nip (6) formed by a cast drum (5) with a diameter of 1500 mm and a chrome-plated, specular luster whose surface has been treated with stearic acid. Cast drum (5) with a surface temperature of 105 °C after rewetting the coating layer surface with a wetting liquid (0.5% concentration)
A cast coated paper (9) was obtained by applying pressure to the paper at a press pressure of 200 kg/cm, drying, and then peeling it off from the cast drum using a take-off roll (8). The operating speed at this time was 80 rn/min.

Example 2 5 Cast coating was carried out in the same manner as in Example 1 except that 0.05 part of Compound 4 in Table 1 was used instead of Compound 1 in Table 1 as the mold release agent added to the cast coating liquid. Got paper.

Example 3 Cast coated paper was prepared in the same manner as in Example 1 except that 1.0 part of Compound 8 in Table 1 was used instead of Compound 1 in Table 1 as the release agent added to the cast coating liquid. I got it.

Example 4 Cast coated paper was prepared in the same manner as in Example 1, except that 0.5 part of Compound 10 in Table 1 was used instead of Compound 1 in Table 1 as the release agent added to the cast coating liquid. I got it.

Example 5 Cast coated paper was prepared in the same manner as in Example 1, except that 5.0 parts of Compound 14 was used instead of Compound I in Table 1 as the release agent added to the cast coating liquid. I got it.

Example 6 2 days Same as Example 1 except that instead of 0.5 parts of Compound 1 as a mold release agent, a mixture of 0.1 part of Compound 1 and 0.9 parts of calcium stearate was used. A cast coated paper was obtained in the same manner.

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

Example 8 In the example process, calcium stearate was used in place of Compound I in Table 1 as the release agent added to the cast coating solution, and 0.05% of Compound 2 in Table 1 was added to the rewetting solution.
A cast coated paper was obtained in the same manner as in Example 1 except that % was added.

Example 9 Cast coated paper was obtained in the same manner as in Example 8, except that 1.0% of Compound 7 was added in place 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 to 37 instead of Compound 2 in Tables 1 to 1.

Example 11 In Example 1, 0.0% of Compound 3 in Table 1 was added to the rewetting solution.
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 in place 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% ammonium oleate was added to the rewetting 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.

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

Example 12 75 parts of kaolin, 15 parts of light calcium carbonate, 5 parts of aluminum hydroxide, 5 parts of Sachin White, and 0.5 part of sodium polyacrylate as a dispersant were dispersed in water using a Coles disperser to give a concentration of 70%. A pigment slurry was prepared. To this, 1 to 0.5 parts of tributyl phosphate as an antifoaming agent, 1.0 part of Compound 2 in Table 1 as a mold release agent, and 15% casein aqueous solution dissolved in aqueous ammonia as an adhesive.
(solid content), 14 parts (solid content) of styrene-butadiene copolymer latex, and water to obtain a coating liquid with a concentration of 55%.

Using this cast coating liquid, casting 1 to 2 were performed using the gelling casting method 2 using the apparatus shown in FIG.

That is, the cast coating liquid prepared according to
0g/n? The dry weight of the casting paper (10) is 20
g/n (g/n) using a roll coater (11), and then coated with a calcium formate aqueous solution (12) with a concentration of 0.5%.
) to gel the coating layer.

9 Next, this paper was passed through a press roll (13
) with stearic acid surface treatment (14
) (surface temperature 90°C) press linear pressure 180kg/
cm, and after drying, it was peeled off from the cast drum with a take-off roll (15) to obtain cast coated paper 06).

The operating speed at this time was 60 m/min.

Example 13 0.1 of Compound 5 was added to the mold release agent instead of Compound 2 in Table-1.
A cast coated paper was obtained in the same manner as in Example 12, except that the same procedure was used as in Example 12.

Example 14 0.5 of Compound 7 was added to the mold release agent instead of Compound 2 in Table-1.
A cast coated paper was obtained in the same manner as in Example 12, except that the same procedure was used as in Example 12.

Example 15 Compound 15 was added to the mold release agent in place of Compound 2 in Table 1.
A cast coated paper was obtained in the same manner as in Example 12 except that 0 part was used.

Example 16 1.0 part of lecithin 0 was used instead of Compound 2 in Table 1 as a mold release agent, and Compound 6 in Table 1 was added to the gelling solution.
A cast coated paper was obtained in the same manner as in Example 12, except that 0.1% of the following was added.

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

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

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 the release agent.

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

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

Example 19 As coating liquid for casting, 80 parts of kaolin, 15 parts of light calcium carbonate, 5 parts of Sachin White, 15 parts of 15% casein aqueous solution (solid content), acrylic acid/butadiene/methyl methacrylate (ratio: 2/33/ 65) Prepare a cast coating liquid with a concentration of 53% consisting of 15 parts (solid content) of the copolymer latex and 0.7 parts of Compound 3 in Table 1, and apply it by wet casting using the apparatus shown in Figure 3. Finished the cast.

That is, the cast coating liquid prepared as described above was applied to a
g/m2 of casting base paper (17)--A is coated with a first coater (18) to a dry weight of 10 g/m2, and then, while this coated layer is in a wet state, a second coating layer is applied. The same cast coating liquid as above was applied to the paper using the coating device 2 (19) so that the dry weight was Log/m2, and the paper was immediately surface-treated with stearic acid using a press roll 2 (20) with a diameter of 800 mm. It was pressed against a cast drum (21) (surface temperature 80°C), and after drying, it was peeled off from the cast drum to obtain a cast coated paper (22). The operating speed at this time was 70 m/min.

Example 20 0.1 of Compound 6 was added to the mold 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 the same procedure was used as in Example 19.

Example 21 1.0 of Compound 9 was added to the mold 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 the same procedure was used as in Example 19.

Example 22 Compound 11 was used instead 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 that 0 part was used.

Example 23 Compound 13 was used as a mold 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 0 part was used.

A'J Example 24 Compound 16 was used instead 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 that 0 part was used.

Comparative Example 6 Stearic acid 5. was used instead 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 that 0 part was used.

Comparative Example 7 Silicone oil was used instead 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 that 0 part was used.

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

(Continuous operation time) It is expressed as the time from the start of operation until a drum shock occurs or paper sticks to the product and a satisfactory product cannot be produced.

In this example, in order to evaluate the continuous operability, a cast coating composition having a composition with low mold releasability was used, and the continuous operability of the cast coated paper in this case was approximately 12
The evaluation of continuous operation was completed in 12 hours because it could be determined by the presence or absence of drum picks and the state of release from the mold after hours.

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

(Ink receptivity) Printed with an RI printing tester (manufactured by Mei Seisakusho), and
After standing for a period of time, peeling of the ink was examined using Sellotape and evaluated based on the following criteria.

O: Good ink receptivity ×: Bad ink receptivity "Effect" The cast coated paper obtained in the example of the present invention is as shown in Table-2.
As is clear from the results in Tables 3 and 4, cast-coated paper with excellent cast quality and high gloss on the cast surface could be obtained with high efficiency.

[Brief explanation of drawings]

FIGS. 1, 2, and 3 are schematic diagrams showing the manufacturing method of cast coated paper used in Examples and Comparative Examples of the present invention. (1), (10), (17): Base paper (unwaingu) (2): Air knife cocoon (3): Air floating dryer (4), (
13), (20) Nibbles roll (5), (14)
, (21): Cast drum (9) , (16), (2
2): Cast coated paper (11): Roll coater (12) Nigelling solution (18): First coating device (19): Second coating device 6 Table 1 Table (continued)

Claims (6)

[Claims] (1) Cast coating, in which a coating layer containing pigment and adhesive as main components is provided on base paper, and while the coating layer is in a wet state, it is pressed against the surface of a heating drum that has a specular gloss to give a strong gloss finish. A method for producing cast coated paper, characterized in that the coating layer contains one or more types of fluorine-containing surfactants. (2) The method for producing cast coated paper according to claim (1), wherein the fluorine-containing surfactant is a compound represented by the following general formula [1]. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [1] R_f represents a perfluoroalkyl group or a perfluoroalkenyl group having 4 to 20 carbon atoms, and may be linear, branched, cyclic, or a combination thereof. Any of these may be used, and the main chain may further contain oxygen atoms, and some of the fluorine atoms may be substituted with hydrogen atoms. n is an integer of 1 to 3, and M represents an alkali metal, an alkaline earth metal, zinc, an ammonium salt, an amine, a hydrogen atom, or an alkyl group having 1 to 20 carbon atoms. Z is a divalent crosslinking group bonded to the carbon atom of R_f and the oxygen atom of the phosphoric acid group. m represents an integer of 0 or 1. (3) The method for producing 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_3M [2] R_f, m and M are the same as in [1], and Y is a divalent bridging group bonded to the carbon atom and sulfur atom of R_f. (4) The method for producing 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 for producing cast coated paper according to claim (1), wherein the fluorine-containing surfactant is a compound represented by the following general formula [4]. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [4] R_f and m are the same as in [1], R_1, R_2 and R_3 are hydrogen atoms, alkyl groups having 1 to 10 carbon atoms,
It is a hydroxyalkyl group, a cycloalkyl group, or an aralkyl group having 7 to 15 carbon atoms. X is a halogen atom, OH, HSO_4, CH_3SO_4, H_2PO_
4. Anionic atoms and groups such as CH_3COO, ▲There are mathematical formulas, chemical formulas, tables, etc.▼. V is a divalent bridging group bonded to the carbon atom and nitrogen atom of R_f. (6) The method for producing cast coated paper according to claim (1), wherein the fluorine-containing surfactant is a compound represented by the following general formula (5). ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [5] R_f and m are the same as in [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 bonded to the carbon atom and nitrogen atom of R_f. It is a crosslinking group. q is an integer from 1 to 4.