JP3279961B2 - Waterproof printing paper that can be recovered and recycled - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-resistant paper for printing which can be recovered and recycled. More particularly, the present invention relates to a water-resistant paper coated with a hydrophobic dispersion on a strong size paper to form a layer having high water resistance and preventing water penetration. It is a processed paper that can compete with synthetic paper,
In addition, the present invention relates to a waterproof paper for printing that can be collected and recycled.

[0002]

2. Description of the Related Art Conventionally, as paper having water resistance,
(1) paper made by fixing a wet strength resin to a raw material, (2) a water-soluble polymer and a crosslinking agent thermosetting resin, and / or
Or, a mixture with a non-thermosetting resin such as epichlorohydrin-modified polyamidoamine, or by externally adding a dispersion of a water-resistant thermoplastic resin, to impart a water-resistant bond to the material constituting the paper, There are known papers and the like in which even if hydrogen bonds are broken by permeation of water, a part of paper strength can be retained by water-resistant bonding points.

[0003] Further, there is a method of providing a water-resistant coating on the paper surface to prevent water from penetrating. Structurally, a polyethylene-coated paper or a mixture of an acrylic dispersion and paraffin is applied. In each case, high water resistance is obtained.

[0004]

However, in the above-mentioned water-resistant paper by internal or external addition (impregnation method), there is a paper that enhances resistance to water penetration depending on the material to be used. Since the penetration of water into the fiber cannot be completely prevented, the effect on the deformation due to the decrease in the paper strength and the expansion of the fiber, especially the effect on the deformation cannot be said to be great.

On the other hand, some water-resistant papers having a water-resistant coating on the paper surface have an effect of preventing water permeation almost completely, but can always satisfy the feel and printability of the paper. And it is difficult to recover and regenerate.

The present invention has been made in view of the above-mentioned problems in the conventional water-resistant paper, and an object thereof is to provide a resin-treated paper as described above in which the paper layer is formed in a paper layer. While preventing the penetration of water as much as possible, the coating layer has a hydrophilic property that does not repel water, aqueous solutions and aqueous dispersions, so that the feel and printability as paper are good and environmental problems are also reduced. It is an object of the present invention to provide a waterproof paper for printing that can be used and can recover used paper.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above object, and as a result of intensive studies, a styrene-butadiene-based synthetic rubber-based copolymer which has been generally unsuitable as a water-proofing agent or a moisture-proof material. Practical water resistance can be obtained by coating a dispersion in which the weight ratio of the styrene component is 30% or more and a good film-forming property is obtained by mixing 60 to 200 parts by weight per 100 parts by weight of the pigment. I found that.

[0008] Styrene 3 having good film-forming properties in the same way
We found that high water resistance and printability can be obtained even with a coating material in which a binder in which a highly hydrophobic (meth) acrylic polymer dispersion is used in combination with a styrene-butadiene-based copolymer of 0% or more and a pigment is used. did.

Further, a styrene-butadiene copolymer is added to a highly water-resistant base paper having a Cobb water absorption of 30 g / m ² or less by using a modified rosin emulsion of 1.0% or more and a metal salt with respect to pulp. It has been found that a water-resistant paper having high water resistance can be obtained by applying a coating material in which a weight ratio of a styrene component is 30% or more and which has a good film-forming property and a mixture of a pigment.

The present invention based on these findings is as follows. In other words, the invention according to claim 1 of the present application is a waterproof paper for printing in which at least one side or both sides of a base paper is coated with a paint containing at least a pigment and a synthetic rubber-based copolymer, The copolymer is mixed in an amount of 60 to 200 parts by weight per 100 parts by weight of the pigment, and the synthetic rubber-based copolymer is a styrene-butadiene-based copolymer or a styrene-butadiene-based copolymer and an acrylic copolymer. Containing a mixture with
And the weight ratio of the styrene component in the monomer component of the styrene-butadiene copolymer is 50 to 60%;
120 second Cobb water absorption by APPI T-441 is 3
g / m ² or less, whereby the coating layer is imparted with hydrophilicity that does not repel water, an aqueous solution, and an aqueous dispersion, thereby improving printability. Available in waterproof paper for printing.

The invention according to claim 2 of the present application is directed to a printing method in which a coating material containing at least a pigment, a synthetic rubber-based copolymer and a (meth) acrylic-based polymer is applied to one or both sides of the base paper. Water-resistant paper, wherein the synthetic rubber-based copolymer is 60 to 20 parts by weight per 100 parts by weight of the pigment.
0 parts by weight, and the synthetic rubber-based copolymer contains a styrene-butadiene-based copolymer or a mixture of a styrene-butadiene-based copolymer and an acrylic-based copolymer. The water absorption of 120 seconds Cobb by -441 is 3 g / m ² or less, whereby the coating layer is provided with a hydrophilic property that does not repel water, aqueous solution and aqueous dispersion, thereby improving printability. A water-resistant paper for printing that can be recovered and recycled.

Further, the invention according to claim 3 of the present application is characterized in that the styrene-butadiene copolymer has a weight ratio of the styrene component in the monomer component of 30 to 70%. 2. A water-resistant paper for printing that can be recovered and recycled according to 2.

Further, the invention according to claim 4 of the present application is characterized in that the (meth) acrylic polymer has a monomer
Alkyl styrene (meth) acrylate and / or
4. The water-recyclable printing paper according to claim 2, wherein the alkyl (meth) acrylate is a copolymer having an alkyl group of C = 8 or more. .

The invention according to claim 5 of the present application is characterized in that the pigment uses any one of calcium carbonate, kaolin, and titanium dioxide. Recyclable printing water-resistant paper.

Further, the invention according to claim 6 of the present application provides a method of adding TAPP to a pulp by adding 1.0% or more of a modified rosin-based emulsion and a metal salt.
The 120 second Cobb water absorption measured by IT-441 is 30 g /
in m ² or less and the water-resistant sheet for one or both surfaces of the base paper, a printing waterproof paper that was coated with coating material containing at least a pigment and a synthetic rubber-based copolymer, the synthetic rubber-based copolymers are 60 to 200 parts by weight per 100 parts by weight of the pigment, and the synthetic rubber-based copolymer is a styrene-butadiene-based copolymer or a mixture of a styrene-butadiene-based copolymer and an acrylic copolymer. And the weight ratio of the styrene component in the monomer component of the styrene-butadiene copolymer is 50 to 60%, and the 120-second Cobb water absorption by TAPPI T-441 is 3 g / m ² or less. Thereby, the coating layer is provided with a hydrophilic property that does not repel water, an aqueous solution and an aqueous dispersion, so that printability is improved. In the ability to print for water-resistant paper.

Further, the invention according to claim 7 of the present application provides a method of adding TAPP to a pulp by adding 1.0% or more of a modified rosin-based emulsion and a metal salt.
The 120 second Cobb water absorption measured by IT-441 is 30 g /
in m ² or less and the water-resistant sheet for one or both surfaces of the base paper, a printing waterproof paper that was coated with coating material containing at least a pigment and a synthetic rubber copolymer and (meth) acrylic polymer, the The synthetic rubber-based copolymer is pigment 100
60 to 200 parts by weight per part by weight, the synthetic rubber-based copolymer is a styrene-butadiene-based copolymer,
Or a mixture of a styrene-butadiene-based copolymer and an acrylic-based copolymer, and TAPPI T-
The water absorption of 120-second Cobb according to 441 is 3 g / m ² or less, whereby the coating layer is imparted with hydrophilicity that does not repel water, aqueous solution and aqueous dispersion, so that printability is improved. The present invention is directed to a water-resistant paper for printing that can be recovered and recycled.

The invention according to claim 8 of the present application is characterized in that the styrene-butadiene copolymer has a weight ratio of the styrene component in the monomer component of 30 to 70%. 7. Waterproof printing paper which can be recovered and recycled according to item 7.

Further, in the invention described in claim 9 of the present application, the modified rosin-based emulsion is a rosin emulsion modified with an α, β-unsaturated polybasic acid, and the metal salt is an aluminum salt. 7. The method according to claim 7, wherein
9. The waterproof paper for printing according to any one of items 1 to 8, wherein the paper is recyclable.

The invention according to claim 10 of the present application is characterized in that the coating amount per one side is in the range of 8 to 25 g / m ² . It is in water-resistant paper for printing that can be recovered and recycled.

Further, the invention described in claim 11 of this application is characterized in that the number of coatings per one side is 2 or more, and the total coating amount is in the range of 8 to 25 g / m ^2. A water-resistant paper for printing that can be recovered and recycled according to any one of claims 1 to 9.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION As one embodiment of the present invention, water-repellent paper for printing that can be recovered and recycled is a styrene-butadiene copolymer on at least one surface of plain paper or paper provided with strong size. The weight ratio of the styrene component is 30 to
It is constituted by applying a paint composed of 70% of a styrene-butadiene copolymer and a pigment. Styrene-
The butadiene-based copolymer is a copolymer of styrene-butadiene, alkyl (meth) acrylate, other vinyl compounds, unsaturated carboxylic acids, and the like. High water resistance is obtained in the range of up to 70%.

In order to provide a water-resistant coating, the hydrophobicity of the dispersoid itself and the surfactant forming the dispersion are important. Soap-free dispersions are ideal, but dispersants with a large interfacial tension reducing effect should be limited as much as possible. In order for these dispersions to exhibit the function of water resistance, it is a necessary condition that the film-forming property is good, and a lower film-forming temperature is desirable.
Since a high styrene-based styrene-butadiene-based copolymer increases the film-forming temperature, the film-forming property deteriorates unless treated at a high temperature. From this point, it can be said that those having a styrene weight ratio of 50 to 60% are optimal.

From this viewpoint, a styrene-butadiene copolymer having a high film-forming property may be replaced with another high styrene or butadiene copolymer.
A styrene copolymer may be used in combination, or a highly hydrophobic alkyl styrene (meth) acrylate having C = 8 or more,
Mixing and / or using a (meth) acrylic polymer such as an alkyl (meth) acrylate copolymer is also effective for forming a water-resistant coating. In particular, a paint using a dispersion of a (meth) acrylic polymer in combination is characterized by a remarkable improvement in ink acceptability.

A water repellent such as paraffin, microcrystalline wax, polyethylene, or a higher fatty acid derivative can be used in combination with these pigment / resin dispersions. The water absorption of Cobb is definitely reduced by the combination of these water repellents, but it does not contribute to water resistance for liquid temperatures higher than the melting point of the water repellent itself. Often lower. In addition, since the water-repellent composition significantly impairs the acceptability of the printing ink, the upper limit is set to 5 parts by weight or less only for applications requiring water-repellency.

As a water repellent, normal paraffin and then microcrystalline wax are effective.
Since the quality of the printing paper is deteriorated, almost no water-repellent effect is recognized, but it is better to use polyethylene, metal soap or the like. However, since the water-resistant coating of the present invention can completely prevent water from entering, it is not necessary to use a water repellent in practical use, and a dispersion of polyethylene, metal soap or the like may be called a lubricant.

As the pigment, kaolin, calcium carbonate,
Titanium dioxide, aluminum trihydroxide, amorphous silica,
Satin white, talc, zinc oxide, parium sulfate, mica, and the like can be used, and those having a high plate-like aspect ratio are preferable for water resistance, but sedimentable calcium carbonate is superior in providing ink receptivity.

Even if covered with a coating having high water resistance, water penetrates from the cross section of the paper like a label and becomes contaminated with the coloring agent, and the surrounding area becomes wavy due to wet elongation, The water resistance of the base paper becomes extremely important in applications in which the penetration of water from the cut surface becomes a problem because the water is frozen by refrigeration and the paper layer is broken. The contact water varies depending on the application such as alkaline water, high-temperature water, etc., and the Cobb water absorption is reduced to 30 g / m ² or less, preferably 20 g / m ² or less by a sizing agent suitable for the purpose, and the water absorption is reduced as much as possible It is desirable to suppress.

In order to improve the water resistance of the base paper, a rosin emulsion modified with an α, β-unsaturated polybasic acid is preferably fixed with a sufficient aluminum salt. In particular, for applications that come into contact with high-temperature water, a raw material in which the above-mentioned modified rosin has a softening point raised to 110 ° C. or higher should be used.
Of course, it is also effective to esterify a part of the acid.

The base paper thus obtained is coated with pigment 100
A coating composition containing 60 to 200% by weight of a dispersion of a styrene-butadiene copolymer in which the weight ratio of the styrene component is 30 to 70% per part by weight is 8 to 25 g /
m ^2, preferably 12 to 20 g / m ² . If the coating amount is 8 g / m ² or less, sufficient water resistance cannot be obtained. If the amount is 25 g / m ² or more, fragments of a coating amount are generated in the regeneration and recovery step, which may cause fish eyes. However, since it is extremely hydrophobic, separation and removal are easy.

The water-resistant coating layer of the present invention further comprises other additives such as a dispersant, a thickener, a flow improver, an antifoaming agent,
A coloring material, a preservative / deodorant, a deodorant, an ultraviolet absorber, a lubricant, an anti-blocking agent, a surfactant, a plasticizer, a pH adjuster, and the like are used as necessary. In the process of forming a waterproof layer of this type, evaporation of water after film formation destroys the film and forms pinholes, and shrinkage during drying often causes cracks in the film. For the purpose of preventing such defects, the quality can be further improved by two or more coating operations.

In order to obtain the water resistance of the present invention, the coating layer can be formed by a usual coater head such as an air knife, a die, a blade, a knife, a roll, a kiss, a wire bar, and a comma.

[0032]

Next, the present invention will be described in detail with reference to examples. All parts and percentages in the examples are parts by weight and percentage by weight.

Example 1 80 parts by weight of heavy calcium carbonate (Escalon # 2000 Sankyo Flour) was dispersed in 20 parts by weight of delaminated kaolin (Hydraprint JM Huber) with an anionic dispersant, and the pH was adjusted with ammonia. Was adjusted to 9.0 or more, and P-6 × 20 (a styrene-butadiene-based copolymer having a styrene component weight ratio of 56%) was added to the resin dispersion.
80 parts by weight of Sumitomo ABS Latex Co., Ltd.
Paritax NS-6 (Wax emulsion Misawa Semetic Chemical Co., Ltd.) for water repellent dispersion
Was added to obtain a paint. 93 g / m of this paint
² Fine paper (Cobb water absorption 22 seconds) Coated on both sides with a coating rod to a solid content of 15 g / m ² / s and dried in a dryer at 105 ° C for 2 minutes. Hot water resistance and ink acceptability were measured.

1) Cobb Water Absorption Cobb water absorption is defined as TAPPI T-441. The water absorption from the paper surface is 2 for the felt surface of the processed paper.
Water permeation g / m when contacted with water at 0 ° C. for 120 seconds
² (the amount of cold water permeation from one side). This measured value was used as an index for comparing the water resistance of the coating film at room temperature.

2) Hot water resistance The hot water resistance is determined by cutting a 5 cm × 10 cm sample from double-sided paper, placing it in a rough wire mesh basket so that the entire surface is in contact, and immersing it in hot water at 80 ° C. for 20 minutes. , Lightly wipe off the adhering water with filter paper, measure the weight,
% Weight increase with respect to equilibrium weight, water absorption per area as g
/ M ² . This measured value was obtained by measuring the amount of water absorption from the coated surface and the cut surface, and was used as an index related to deformation of a label or the like during hot water disinfection.

3) Ink acceptability Ink acceptability was measured using an IHI RI tester type 1 with 0.2 cc of Trans-G red ink manufactured by Dainippon Ink and Chemicals, and the uncoated sample was printed. The printing density of the printing paper was measured with a Macbeth densitometer (red filter).

4) Difficulty of Processed Paper The difficulty of processed paper is evaluated by subjecting the processed paper to a disintegration process using a standard disintegrator specified in JIS P-8209, observing the dispersion state of paper components, and evaluating the disintegration. Passed samples with the same disintegration properties as art, art, and coated paper (marked with ○ in the table)
And

Example 2 100 parts by weight of P-6 × 20 in a resin dispersion,
Paritax NS-6 for water repellent dispersion 5
The same procedure as in Example 1 was carried out except that the coating was made by adding parts by weight.

Example 3 The resin dispersion was changed to L-430 (a styrene-butadiene copolymer having a styrene component weight ratio of 60% by weight, Nippon Zeon Co., Ltd.) and 100 parts by weight, and a latex was added to the water repellent dispersion. The procedure was performed in the same manner as in Example 1 except that 5 parts by weight of NS-6 was added to obtain a coating material.

Example 4 50 parts by weight of P-6 × 20 and U in a resin dispersion
C-404 (styrene-acrylate copolymer)
This was carried out in the same manner as in Example 1 except that 50 parts by weight of Seiden Chemical Co., Ltd. was used in combination, and a coating was prepared by adding 55 parts by weight of Paritax NS-6 to the water repellent dispersion.

Example 5 A resin dispersion was repelled by using 50 parts by weight of P-6 × 21 (a styrene-butadiene copolymer having a styrene content of 39% by weight, Sumitomo ABS Co., Ltd.) and 50 parts by weight of US-40450. The same operation as in Example 1 was carried out except that the coating material did not use a liquid agent.

Example 6 N-BKP and L-BKP pulp having a mixing ratio of 1: 1 was mixed with 300
The mixture was beaten to 1.7 ml, and a sizing agent (R-800, manufactured by Hyundai Chemical Industry Co., Ltd.) 1.7%, a sulfate band 2.5%, sodium aluminate 0.1%, and cationized starch 1.2% were added.
8 produced 64 g / m ² paper. The Cobb water absorption of the papermaking paper was 15 g / m ² . This hot water base paper was used for the following coated paper.

20 parts by weight of delaminated kaolin and 80 parts by weight of heavy calcium carbonate were dispersed with an anionic dispersant,
After adjusting the pH to 9 or more with aqueous ammonia, 80 parts by weight of P-6 × 20 was added to the resin dispersion, and 2 parts by weight of Nopcoat C-104 (Calcium Stearate San Nopco Co., Ltd.) was added as a lubricant to form a paint. Thereafter, the solid content is 15 g / m ² /
s was measured for Cobb water absorption, hot water resistance, and ink receptivity of a sample which was coated on both sides so as to obtain s and dried in a dryer at 105 ° C. for 2 minutes.

Example 7 The same procedure as in Example 6 was carried out except that P-6 × 20 was used as 100 parts by weight as the resin dispersion.

Example 8 The resin dispersion was Pateracol EXP LK-4.
06 (a styrene-butadiene-based polymer having a weight ratio of 60% of a styrene component, Dainippon Ink and Chemicals, Inc.) of 80 parts by weight,
The operation was carried out in the same manner as in Example 6 except that the amount of Nopcoat C104 was changed to 2.5 parts by weight.

Example 9 The resin dispersion was Pateracol EXP LK-4.
06 was used in combination with 30 parts by weight of UC-404, and 2.5 parts by weight of Nopcoat C-104 were used in the same manner as in Example 6.

Example 10 60 parts by weight of P-6 × 21 was added to a resin dispersion.
Example 6 was carried out in the same manner as in Example 6, except that 40 parts by weight of EK-61 (acrylic acid ester copolymer Seiden Chemical Co., Ltd.) was used.

Example 11 70 parts by weight of light calcium carbonate (TP-121 Okutama Kogyo Co., Ltd.) was dispersed in 30 parts by weight of a delaminated clay with an anionic dispersant, and the pH was adjusted to 9.9 with aqueous ammonia.
0 or more, and P-6 × 20 = 6 for resin dispersion
A coating material containing 0 parts by weight, 40 parts by weight of UC-404 and 1.5 parts by weight of Nopcoat C104 as a lubricant was applied to the base paper of Example 6 with an air knife coater at 15 g / m ² . About coated paper (a) and super-hanging goods (b)
Cobb's water absorption, heat resistance and ink acceptability were measured.

Comparative Example 1 100 parts by weight of SK-451 (styrene-butadiene copolymer having a styrene content of 36% by weight, Takeda Pharmaceutical Co., Ltd.) as a resin dispersion, and Paragit P-60 (normal) as a water repellent Paraffin emulsion was carried out in the same manner as in Example 1, except that 5 parts by weight of Meisei Chemical Industry Co., Ltd. was used.

Comparative Example 2 P-7110 (styrene-butadiene copolymer having a styrene component weight ratio of 39%) was used as the resin dispersion.
100 parts by weight of Sumitomo ABS Latex Co., Ltd.
A water repellent dispersion was prepared in the same manner as in Example 1 except that Paradit P-60 (Wax Emulsion Meisei Chemical Industry Co., Ltd.) was added in an amount of 5 parts by weight to prepare a paint.

[0051]

[Table 1] As is clear from Table 1, the coating layers of Examples 1 to 4 hardly accept normal-temperature water, but at high temperatures, the water-repellent composition melts, so that the water resistance of the coating layers themselves decreases. The Cobb water absorbency of the base paper used in Examples 1 to 5 and Comparative Examples 1 and 2 was 22 g / m ² , but the cross-sectional area was large because the rice basis weight was large and the density was low. The sizing agent used was a 1% modified rosin emulsion for high-quality paper and lacked heat resistance. When immersed in hot water of 80 ° C. for 20 minutes, 3 to 5 mm of water was observed from the cut edge. Becomes transparent.

On the other hand, the sixth to eleventh embodiments correspond to the sixth embodiment.
Heat-resistant modified rosin emulsion (K-800)
Modern Chemical Industry Co., Ltd.) is used, and the density of the paper layer is increased by wet pressing as much as possible, so that it is prevented from infiltrating from the cross section even in hot water. ing.

When water-resistant paper is used for the bag, water absorption from the cut is hardly a problem, but is extremely important when performing hot water disinfection, particularly when the label is subjected to hot water disinfection. This may cause cracking of the part.

In the label, the adhesive surface is processed with a solvent-based welding agent, which is adhered to the surface of plastic, metal, or ceramic, and when subjected to hot water treatment, only the label surface is exposed to water from the coating film. Although it is likely to be stretched to cause wrinkles and swelling, these defects can be prevented when the hot water resistance is 30 g / m ² or less.

In Comparative Examples 1 and 2, the weight ratio of styrene in the styrene-butadiene copolymer was 40% or less.
Sufficient water resistance is not obtained, Cobb water absorption itself is remarkable,
Indicates that it is big.

[0056]

As described above, according to the present invention, it is possible to obtain a water-resistant paper having good printability and having a small amount of water penetration and little deformation due to water even when used for hot water sterilization. Although the performance is not the same as that of synthetic paper, it is possible to produce a processed paper containing a high percentage of hydrophilic components and having a performance closer to that of synthetic paper. In addition, since the problem of the synthetic paper in the printing process can be considerably improved, it is characterized in that it is possible to partially switch from the synthetic paper, and it is possible to recycle the paper.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-30419 (JP, A) JP-A-9-21096 (JP, A) JP-A-9-67795 (JP, A) 111696 (JP, A) JP-A-6-73692 (JP, A) JP-A-7-189173 (JP, A) JP-A-10-226991 (JP, A) JP-A-9-302598 (JP, A) JP-A-10-204797 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D21H 11/00-27/42

Claims (11)

(57) [Claims] [Claim 1, claim] for one side or both sides of the base paper, small
Apply a paint containing at least a pigment and a synthetic rubber-based copolymer.
Water-resistant paper for printing, wherein the synthetic rubber-based copolymer is 60% by weight per 100 parts by weight of the pigment.
To 200 parts by weight, and the synthetic rubber-based copolymer is a styrene-butadiene-based copolymer.
Compound or a styrene-butadiene copolymer and
And a mixture with a ril copolymer.
Styrene in the monomer component of the styrene-butadiene copolymer
The weight ratio of the Tylene component is 50 to 60%, and the 120-second Cobb water absorption according to TAPPI T-441 is 3 g / m ² or less, whereby the coating layer contains water, an aqueous solution, and an aqueous dispersion.
Good printability with hydrophilicity that does not repel John
A water-resistant paper for printing that can be collected and recycled. 2. One or both sides of the base paper are
At least pigments, synthetic rubber copolymers, and (meth) acrylic
Waterproof printing paper coated with a paint containing a polymer.
Thus, the synthetic rubber-based copolymer is 60 parts by weight per 100 parts by weight of the pigment.
To 200 parts by weight, and the synthetic rubber-based copolymer is a styrene-butadiene-based copolymer.
Compound or a styrene-butadiene copolymer and
Containing a mixture with a ril-based copolymer;
120 seconds Cobb water absorption of 3 g / m according to IT-441
² or less, whereby the coating layer has water, an aqueous solution and an aqueous dispersion.
Good printability with hydrophilicity that does not repel John
A mark that can be recovered and recycled.
Waterproof paper for printing. 3. The styrene-butadiene copolymer
Means that the weight ratio of the styrene component in the monomer component is 30 to 7
3. Recovering and recycling according to claim 2, characterized in that it is 0%.
Waterproof paper for printing. 4. The (meth) acrylic polymer is a copolymer in which the monomer is a styrene (meth) acrylic acid alkyl ester and / or a (meth) acrylic acid alkyl ester and the alkyl group is C = 8 or more. 4. The water-repellent printing paper according to claim 2, wherein the printing paper is a recyclable printing paper. 5. The pigment according to claim 1, wherein the pigment is calcium carbonate, kaori.
Or titanium dioxide
The recyclable mark according to any one of claims 1 to 4.
Waterproof paper for printing. 6. Addition of 1.0% or more of a modified rosin-based emulsion and a metal salt to pulp to make TAPPI T-441 a 120-second Cobb water absorbency of 30 g / m2. ^The water-resistant base paper with a thickness of ² or less should have at least one pigment and a synthetic rubber
A waterproof paper for printing coated with a paint containing a polymer, wherein the synthetic rubber-based copolymer is 60% by weight per 100 parts by weight of the pigment.
To 200 parts by weight, and the synthetic rubber-based copolymer is a styrene-butadiene-based copolymer.
Compound or a styrene-butadiene copolymer and
And a mixture with a ril copolymer.
Styrene in the monomer component of the styrene-butadiene copolymer
The weight ratio of the styrene component is 50 to 60%, and the 120-second Cobb water absorbency according to TAPPI T-441 is 3 g / m ² or less, whereby the coating layer contains water, an aqueous solution and an aqueous dispersion.
Good printability with hydrophilicity that does not repel John
A water-resistant paper for printing that can be collected and recycled. 7. Addition of 1.0% or more of a modified rosin-based emulsion and a metal salt to pulp to make TAPPI T-441 a 120-second Cobb water absorbency of 30 g / m2. ^The water-resistant base paper with a thickness of ² or less should have at least one pigment and a synthetic rubber
Apply paint containing polymer and (meth) acrylic polymer
And water-resistant paper for printing, wherein the synthetic rubber-based copolymer is 60% by weight per 100 parts by weight of the pigment.
To 200 parts by weight, and the synthetic rubber-based copolymer is a styrene-butadiene-based copolymer.
Compound or a styrene-butadiene copolymer and
Containing a mixture with a ril-based copolymer;
120 seconds Cobb water absorption of 3 g / m according to IT -441
² or less, whereby the coating layer has water, an aqueous solution and an aqueous dispersion.
Good printability with hydrophilicity that does not repel John
A water-resistant paper for printing that can be collected and recycled. 8. The styrene-butadiene copolymer
Means that the weight ratio of the styrene component in the monomer component is 30 to 7
The recovery and recycling method according to claim 7, wherein the recovery rate is 0%.
Waterproof paper for printing. 9. The modified rosin emulsion according to claim 1, wherein
The water-resistant paper for printing which can be recovered and reproduced according to any one of claims 7 to 8, which is a rosin emulsion modified with an α, β-unsaturated polybasic acid, and wherein the metal salt is an aluminum salt. 10. A coating amount per side of 8 to 25 g / m.
^The waterproof paper for printing which can be collected and reproduced according to any one of claims 1 to 9 , wherein the paper is in the range of ² . 11. coating number per one surface is not less than 2 times, according to any one of claims 1 to 9 the coating amount total is equal to or in the range of 8 to 25 g / m ² Waterproof printing paper that can be recovered and recycled.