JP2955697B2 - Waterproof coated paper for decorative board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to waterproof coated paper for decorative boards. More specifically, the present invention
The present invention relates to a waterproof coated paper used for a sanitary room such as a bathroom, a dressing room, a washroom, a building material used for a kitchen or the like, a decorative board such as a laminated plywood used for a kitchen cabinet and the like.

[0002]

2. Description of the Related Art Sanitary rooms, wall panels used in kitchens, piers, storage cabinet panels, kitchen cabinets, etc. are required to be easily dew-condensed, wet with water, and have moisture-proof and waterproof properties. Is used. In recent years, along with changes in lifestyles and diversification of needs, general decorative panels such as wall panels for living rooms and furniture have a high-quality feel and high-quality ones that give a feeling of moisturizing life. Is being sought. In addition, from the viewpoint of total harmony of dwellings, sanitary rooms, wall panels used for kitchens, crosspieces, storage panels, and kitchen cabinets etc. have the same luxury as living room wall boards and furniture. There is a demand for a high-quality product having a feel that gives moisture to life. For that purpose, a moisture-proof and waterproof veneer is suitable. However, both the particle board and the medium fiberboard (MDF), which are the base materials of the decorative board, have poor moisture-proof and waterproof properties, swell when absorbing water, curl or generate mold, and cannot be used as is. . Therefore, sanitary rooms,
Of those used for wall panels, crossbars, storage panels used for kitchens, and kitchen cabinets,
As a moisture-proof / waterproof decorative board, there are printed vinyl chloride and the like on a base material made of plywood, particle board, MDF, etc., which are the same as those currently used for wall boards for living rooms and furniture. Veneer or V-cut plywood laminated with a veneer film made of, or a veneer wrapped by a wrapping machine. Printed decorative film made of vinyl chloride etc. has high moisture-proof and water-proof properties, and is well suited to the pressure roll of a lapping machine in laminating a curved substrate. It is often used not only for decorative boards for curved shapes. However, the cost of the material of vinyl chloride is relatively high, and there are limitations on the inks and the like that can be used for printing, and there is a limit in giving a high-class feel. In addition, printing of vinyl chloride is performed by the gravure printing method, but in order to prevent the occurrence of troubles due to deterioration of the dimensional stability of the vinyl chloride film due to heating in the drying process after printing, printing and printing are performed.
Since the drying speed must be suppressed and the speed cannot be increased, productivity is low. In addition, there is a problem that harmful gas is generated during combustion.

As decorative board paper, (a) base paper to which a resin is internally added, and (b) paper to which resin is impregnated at the time of papermaking or after papermaking (JP-A-63-199002, See, for example, JP-A-63-199044). Paper is inexpensive, and a wide variety of printing inks can be used, and a wide range of printing inks can be used, so high-quality printing is possible. Adhesion with the substrate surface made of plywood, particle board, MDF, etc. It is much better than vinyl chloride. However, moisture proof
In addition to lack of waterproofness, even when a paper printed and top-coated is used, water penetrates from the top-coat layer, swells the particle board and MDF, and causes curling and mold generation. Also, in the laminating process on the curved substrate, when the pressure roll of the lapping machine is pressed against the concave portion of the curved substrate, the bending strength and inter-sheet strength are not enough, so that cracks, cracks, cracks, etc. occur. It is easy to be fuzzed or damaged due to friction during use as a decorative board. For this reason, this type of decorative board paper of the related art is only used for a planar decorative board for ceiling or the like which is bonded to a plywood or the like.

As a result of intensive studies, the inventor of this application has already invented a coated paper for decorative board having good printability (see JP-A-4-314538). However, the coated paper for decorative board was not sufficient in moisture-proof / water-proof properties, bending strength, and inter-sheet strength.
Therefore, in addition to being inexpensive for paper and capable of high-quality printing, it is excellent in moisture-proof and waterproof properties, and has excellent bending strength and inter-sheet strength. The development of a suitable one was desired.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and uses inexpensive paper as a material, has excellent moisture-proof and waterproof properties, and is capable of wrapping on a curved base material. It is an object of the present invention to provide a waterproof coated paper for decorative board, which has good processing characteristics in V-cut and can obtain a high-quality decorative board.

[0006]

Means for Solving the Problems The above problems are solved by JIS P
When the surface strength specified in 8129 is 15 to 32 A and J
A soap-free emulsion polymerization SBR resin as a clear waterproof resin containing no filler is provided on at least one side of base paper having a smoothness specified by ISP 8119 of 200 seconds or more.
Tex, soap-free emulsion polymerization NBR latex,
Any of the loop-free emulsion polymerization MBR latex
Was achieved by causing 5 to 25 g / ^{m 2} coated on dry weight.

[0007] The base paper used in the present invention must satisfy the conditions of pulp: L-BKP is 80-1.
00%, N-BKP is 0 to 20%, freeness: 180
It is preferable to use one of up to 350 cc. The freeness is preferably 200 to 310 cc. NB
If the KP exceeds 20%, the formation deteriorates and coating unevenness occurs during coating, resulting in printing unevenness. If the freeness is less than 180 cc,
Drainage of water and drying properties are deteriorated, and uneven adhesion of the dryer occurs, resulting in uneven gloss. Conversely, if the freeness exceeds 350 cc, sufficient inter-sheet strength cannot be obtained.
The freeness is preferably in the above-mentioned range in view of the balance between the applicability of the clear waterproof resin component to the base paper surface described later and the inter-sheet strength, and the like.

[0008] Among the chemicals internally added to the pulp solution, cationized starch, polyacrylamide resin, polyamide epichlorohydrin resin and the like can be used as a paper strength enhancer. In particular, cationized starch also functions as a wire release accelerator. The amount of addition
DRY 30 to 65 kg / T is preferable, and in particular, the addition amount DRY 50 to 60 kg / T is desirable to increase the sheet-to-sheet strength. In addition, a filler such as a size fixing agent such as a sulfuric acid band, a pitch removing agent, a rosin sizing agent (saponification type, emulsion type), an antifoaming agent, and titanium oxide can be added to the pulp solution.

The pulp liquor can be formed by a conventional fourdrinier, twin-wire papermaker, or round mesh papermaker. Then, it is dried by a Yankee dryer or a multi-cylinder dryer to a moisture content of about 4.0%.

The base paper preferably has a surface strength of 15 to 32 A and a smoothness of 200 seconds or more. If the surface strength in the range of 15～32A, was coated on a base paper chestnut
A chromatography waterproof resin and cracks by pressing the roll wrapping machine I cooperation with, crack, to crack and the like occur,
It has sufficient bending strength for bending for V-cut plywood. In addition, high-quality decorative boards used in kitchen cabinets and the like are required to have sufficient strength against the tape peeling strength (inter-sheet strength) after cross-cutting. In order to satisfy such a tape peeling strength, the base paper preferably has a surface strength of particularly 20 to 32A. In addition, there in the smoothness of 200 seconds or more
If it is possible to perform the coating of the clear over the waterproof resin liquid uniformly. If smoothness is less than 200 seconds, clear over uneven coating of the waterproof resin liquid is generated, is not preferred since it leads to uneven printing later. In addition, the smoothness of the base paper may be any level as long as the clear waterproof resin liquid can be uniformly applied to the base paper.
The upper limit is not particularly limited. However,
In the case of using a paper-made and dried base paper, a base paper having a technical limit of about 500 seconds can be used, and in the case of a super calendered base paper, a base paper of up to 800 seconds can be used. In the base paper with a smoothness exceeding this, the transferability of the clear waterproof resin liquid to the base paper during coating is poor,
As a result, coating unevenness is likely to occur, which is not preferable.

[0011] Then, as a clear waterproof resin used in this invention can be used saw Pufuri emulsion polymerization SBR latex, soap-free emulsion polymerization NBR latex, any of the soap-free emulsion polymerization MBR latex. Soap-free emulsion polymerization refers to polymerization in which a reactive emulsifier is used and the emulsifier reacts with the produced polymer at the end of the emulsion polymerization to be incorporated into polymer molecules. For soap-free emulsion polymerization of latex, it is preferable to use a reactive emulsifier of an allyl alcohol derivative. Soap-free emulsion polymerization SBR
Latex, soap-free emulsion polymerization NBR latex,
By using a soap-free emulsion polymerization MBR latex, a moisture-proof / water-proof function can be provided. On the other hand, SBR latex, NBR latex and MBR latex which have not undergone soap-free emulsion polymerization contain an emulsifier, which absorbs water, and thus has insufficient moisture-proof and waterproof functions, which is not preferable. Further, at least internally crosslinked SBR latex as a clear waterproof resin,
Any of internally crosslinked NBR latex, internally crosslinked MBR latex, self-crosslinked SBR latex, self-crosslinked NBR latex, and self-crosslinked MBR latex can be used. Internally crosslinked S
BR latex, internally crosslinked NBR latex, internally crosslinked MBR latex are SBR latex, NB
It can be obtained by subjecting R latex and MBR latex to internal crosslinking with an internal crosslinking agent. High internal density of polymer (to increase the molecular weight) by internal crosslinking
By doing so, swelling in water can be suppressed, and the moisture-proof / water-proof function can be improved. As the internal crosslinking agent,
Divinylbenzene (DVB) is preferably used. Self-crosslinked SBR latex, self-crosslinked NB
R latex and self-crosslinked MBR latex are SB
It can be obtained by self-crosslinking R latex, NBR latex and MBR latex with a self-crosslinking agent. The self-crosslinking agent allows a crosslinking reaction at the time of film formation to promote film formation, thereby improving the moisture-proof / waterproof function. As the self-crosslinking agent, n-methylolacrylamide (n-MAM) and glycidyl methacrylate (GMA) are preferable. These clear waterproofing resins can be used alone or in combination, which is the product of interest, namely sanitary rooms,
It is appropriately determined according to the required quality (sheet-to-sheet strength, bending strength, etc.) of the wall plate, crosspiece, storage panel, and kitchen cabinet used in the kitchen.

[0012] The clear waterproof resin composed of the above-mentioned materials is obtained by a roll coater method, an air knife coater method,
The raw paper is supplied and coated on at least one side of the base paper by a known coating method such as a blade coater method or a bar coater method. From the viewpoint of the smoothness of the coated surface, the blade coater method,
Particularly, a method using a tip blade method or a vent blade method is preferable. By such a method, the clear waterproof resin is coated on the base paper so that the dry weight becomes 5 to 25 g / m ² ,
Obtain waterproof coated paper for decorative board. If the dry weight of the clear waterproof resin is less than 5 g / m ² , the surface of the base paper cannot be covered uniformly, resulting in uneven coating, resulting in insufficient moisture and waterproof properties. Conversely, 25g
If it exceeds / m ² , the drying property after coating will be poor and the coating speed will be slow, leading to an increase in cost. The back of the base paper may be coated with a known curled-preventing oxidized starch, a preservative, and a water-proofing agent, if necessary. And, of course, the application of the clear waterproof resin liquid may be performed on both sides.

Further, after a clear waterproof resin solution is applied and dried, a pigment comprising titanium, clay and calcium carbonate is provided on at least one side of waterproof coated paper for decorative board in order to improve printing properties such as ink receptivity. Coating can also be applied. As the pigment coating agent, titanium, clay, and calcium carbonate alone or a mixture thereof is used. These pigment coating liquids are supplied to the surface of the waterproof coated paper for decorative boards by a known coating method such as a roll coater method, an air knife coater method, a blade coater method, and a bar coater method to form a coating layer.

When the printing gloss is required, it is preferable to perform a super calendar process. The nip pressure or the number of nip steps of the super calender is appropriately changed depending on the required glossiness. Usually, the nip pressure is preferably 145 to 250 kg / cm, and the nip step number is preferably 5 or more. After that, print it,
If necessary, apply a surface protective material by a known method,
It is possible to obtain a waterproof coated paper product for a printed decorative board having extremely high moisture resistance and waterproofness. Then, this is bonded to a base material such as plywood or wrapped by a wrapping machine to produce a moisture-proof / waterproof decorative board, which is used as a building material requiring moisture-proof / waterproof.

[0015]

[Function] Soap free as a clear waterproof resin containing no filler, on at least one side of base paper having a surface strength specified by JIS P 8129 of 15 to 32 A and a smoothness specified by JIS P8119 of 200 seconds or more.
Emulsion polymerization SBR latex, soap-free emulsion polymerization NB
R latex, soap-free emulsion polymerization MBR latex
The veneer waterproof coated paper or is formed by 5 to 25 g / m ² coated at a dry weight of the moisture-proof and waterproof properties,耐曲strength, inter-sheet strength, smoothness, print gloss, ink receptivity It is suitable for the production of a moisture-proof / waterproof decorative board using a V-cut plywood and a wrapping machine.

[0016]

The present invention will be described below in more detail with reference to examples. Of course, the present invention is not limited by the following examples. (Example 1) L-BKP 100%, Freeness 200
cc, polyacrylamide paper strength enhancer DRY46
A pulp solution of Kg / T was formed on a fourdrinier paper machine at a speed of 200 m / min to obtain a base paper having a surface strength of 23 A, a smoothness of 410 seconds, and a rice tsubo of 30 g / m ² . Soap-free emulsion polymerization SB
R latex (trade name Pateracol SB-302, manufactured by Dainippon Ink and Chemicals, Inc.) was coated on one side of the base paper with a coating amount (dry weight) of 10 g / m ² by a vent blade coater on an off-machine. Then, the coated surface was super-calendered at a speed of 500 m / min and a nip pressure of 1
This was treated under the conditions of 45 kg / cm and a roll temperature of 40 ° C. to obtain a waterproof coated paper for decorative board. The obtained waterproof coated paper for decorative board was wrapped on MDF by a wrapping machine using a vinyl acetate adhesive to produce a decorative board. In order to evaluate the printability of the waterproof coated paper for decorative boards, gravure printing was performed using a nitrifying cotton-based ink.

The test method and the evaluation method are as follows, and the results are as shown in Table 1. (A) Freeness is based on JIS P 8121,
It was measured with a Canadian standard freeness tester. (B) The surface strength was measured by a wax method based on JIS P8129. (C) Smoothness was measured using a Beck smoothness tester based on JIS P 8119. (D) The moisture permeability was measured under condition B, that is, at a temperature of 40 ° C. and a relative humidity of 90% based on JIS Z 0208. (E) The waterproofness was evaluated by immersing in water after laminating with MDF and evaluating the increase in weight due to water content. ：: excellent ：: good ×: unsuitable (f) The gloss was measured by a gloss meter based on JIS P8142. (G) Printability was evaluated by performing gravure printing on building materials and enlarging the shape of halftone dots. After printing, a normal urethane top coat was applied. ：: excellent ：: good Δ: slightly difficult ×: unsuitable (h) The tape peeling strength was measured by applying a cellophane tape (registered trademark) strongly to the coated surface, peeling off the surface fiber, and observing the state of peeling between paper fibers. ：: Excellent ：: Good △: Slightly difficult ×: Unsuitable (i) Cross-cut suitability: Cross-cut the coated surface with a cutter, strongly adhere cellophane tape (registered trademark), peel off, observe the state of separation between papers did. ：: Excellent ：: Good Δ: Slightly difficult ×: Unsuitable (j) For the lapping machine aptitude, cracks, cracks and cracks in the uneven portions were observed. ◎: None at all ○: Almost none △: Somewhat ×:
Inappropriate (k) V-cut suitability is as follows: a cut out to a predetermined size is folded and expanded in a cross shape, then turned upside down and expanded again in a cross shape, and along the fold on the coating side. Then, Magic Ink (registered trademark) was applied, and the degree of ink penetration was observed from the back surface. ◎: None at all ○: Almost none △: Somewhat ×:
Unsuitable (l) Stain resistance is due to the change in gloss of the coated surface due to detergent, and
Evaluation was made based on the change in gloss of the coated surface due to alkali (NaOH) and acid (HCl). ◎: Excellent ○: Good △: Somewhat difficult ×: Not suitable

(Example 2) A 100% L-BKP pulp solution having a freeness of 300 cc and a polyacrylamide-based paper strength enhancer DRY46Kg / T was machined at a speed of a fourdrinier paper machine at a speed of 20%.
Papermaking under the condition of 0 m / min, surface strength 18A, smoothness 38
In 0 seconds, a base paper of 30 g / m ² of rice tsubo was obtained. Soap-free emulsion polymerization SBR latex (trade name Pateracol SB-3)
02, manufactured by Dainippon Ink and Chemicals, Inc.) on a single side of the base paper using a vent blade coater on an off-machine.
g / m ^{2 at} a coating amount (dry weight), and thereafter, the coated surface is super-calendered at a speed of 500 m / min.
It was treated under the conditions of a nip pressure of 145 kg / cm and a roll temperature of 40 ° C. to obtain a waterproof coated paper for decorative board. The obtained waterproof coated paper for decorative board was wrapped on MDF by a wrapping machine using a vinyl acetate adhesive to produce a decorative board. In order to evaluate the printability of the waterproof coated paper for decorative boards, gravure printing was performed using a nitrifying cotton-based ink. The same tests and evaluations as in Example 1 were performed, and the results shown in Table 1 were obtained.

(Example 3) A 100% L-BKP, 350 cc freeness, polyacrylamide-based paper strength enhancer DRY 46 Kg / T pulp solution was machined on a fourdrinier paper machine at a speed of 20%.
Papermaking under the condition of 0 m / min, surface strength 16A, smoothness 37
In 0 seconds, a base paper of 30 g / m ² of rice tsubo was obtained. Soap-free emulsion polymerization SBR latex (trade name Pateracol SB-3)
02, manufactured by Dainippon Ink and Chemicals, Inc.) on a single side of the base paper using a vent blade coater on an off-machine.
g / m ^{2 at} a coating amount (dry weight), and thereafter, the coated surface is super-calendered at a speed of 500 m / min.
It was treated under the conditions of a nip pressure of 145 kg / cm and a roll temperature of 40 ° C. to obtain a waterproof coated paper for decorative board. The obtained waterproof coated paper for decorative board was wrapped on MDF by a wrapping machine using a vinyl acetate adhesive to produce a decorative board. In order to evaluate the printability of the waterproof coated paper for decorative boards, gravure printing was performed using a nitrifying cotton-based ink. The same tests and evaluations as in Example 1 were performed, and the results shown in Table 1 were obtained.

(Example 4) L-BKP 80%, N-BK
A pulp solution containing P20%, freeness of 200 cc and polyacrylamide-based paper strength enhancer DRY46 Kg / T was formed on a fourdrinier paper machine at a speed of 200 m / min.
A base paper of 3A, smoothness of 350 seconds, and rice tsubo of 30 g / m ² was obtained. Soap-free emulsion polymerization SBR latex (trade name Pateracol SB-302, Dainippon Ink and Chemicals, Inc.)
Is coated on one side of the base paper with a coating weight (dry weight) of 10 g / m ² on a off-machine using a vent blade coater.
The coating was performed under the conditions of a speed of 500 m / min, a nip pressure of 145 kg / cm, and a roll temperature of 40 ° C. to obtain a waterproof coated paper for decorative board. The obtained waterproof coated paper for decorative board was wrapped on MDF by a wrapping machine using a vinyl acetate adhesive to produce a decorative board. In order to evaluate the printability of the waterproof coated paper for decorative boards, gravure printing was performed using a nitrifying cotton-based ink. The same tests and evaluations as in Example 1 were performed, and the results shown in Table 1 were obtained.

[0021]

[Table 1]

Example 5 A 100% L-BKP pulp solution having a freeness of 200 cc and a polyacrylamide-based paper strength enhancer DRY46 Kg / T was machined at a fret paper machine at a speed of 20%.
Paper-making under the condition of 0 m / min, surface strength 23A, smoothness 41
In 0 seconds, a base paper of 30 g / m ² of rice tsubo was obtained. Soap-free emulsion polymerization NBR latex (trade name Pateracol LP26)
2-4, manufactured by Dainippon Ink and Chemicals, Inc.) on a single side of the base paper using a vent blade coater on an off-machine.
Coating amount (dry weight) of 0 g / m ² , and then the coated surface was super-calendered at a speed of 500 m / m 2.
And nip pressure of 145 kg / cm and roll temperature of 40 ° C. to obtain a waterproof coated paper for decorative board. The obtained waterproof coated paper for decorative board was wrapped on MDF by a wrapping machine using a vinyl acetate adhesive to produce a decorative board. In order to evaluate the printability of the waterproof coated paper for decorative boards, gravure printing was performed using a nitrifying cotton-based ink. The same tests and evaluations as in Example 1 were performed, and the results shown in Table 2 were obtained.

Example 6 A 100% L-BKP pulp solution having a freeness of 200 cc and a polyacrylamide-based paper strength enhancer DRY46 Kg / T was machined at a fret paper machine at a speed of 20%.
Paper-making under the condition of 0 m / min, surface strength 23A, smoothness 41
In 0 seconds, a base paper of 30 g / m ² of rice tsubo was obtained. Soap-free emulsion polymerization MBR latex (trade name Pateracol LP26)
2-5, manufactured by Dainippon Ink and Chemicals, Inc.) on one side of the base paper using a vent blade coater on an off-machine.
Coating amount (dry weight) of 0 g / m ² , and then the coated surface was super-calendered at a speed of 500 m / m 2.
And nip pressure of 145 kg / cm and roll temperature of 40 ° C. to obtain a waterproof coated paper for decorative board. The obtained waterproof coated paper for decorative board was wrapped on MDF by a wrapping machine using a vinyl acetate adhesive to produce a decorative board. In order to evaluate the printability of the waterproof coated paper for decorative boards, gravure printing was performed using a nitrifying cotton-based ink. The same tests and evaluations as in Example 1 were performed, and the results shown in Table 2 were obtained.

(Comparative Example 1) A pulp solution of L-BKP 100%, freeness 200 cc, polyacrylamide paper strength enhancer DRY 46 Kg / T was made at a fourdrinier paper machine at a speed of 20%.
Paper-making under the condition of 0 m / min, surface strength 23A, smoothness 41
In 0 seconds, a base paper of 30 g / m ² of rice tsubo was obtained. Soap-free emulsion polymerization SBR latex (trade name Pateracol SB-3)
02, manufactured by Dainippon Ink and Chemicals, Inc.) on one side of the base paper using a vent blade coater on an off-machine.
/ M ^{2 with} a coating amount (dry weight), and then the coated surface is treated with a super calender under the conditions of a speed of 500 m / min, a nip pressure of 145 kg / cm, and a roll temperature of 40 ° C., and waterproofing for decorative boards. A coated paper was obtained. The obtained waterproof coated paper for decorative board was wrapped on MDF by a wrapping machine using a vinyl acetate adhesive to produce a decorative board. In order to evaluate the printability of the waterproof coated paper for decorative boards, gravure printing was performed using a nitrifying cotton-based ink. The same tests and evaluations as in Example 1 were performed, and the results shown in Table 2 were obtained.

(Comparative Example 2) A commercially available paper-to-paper reinforced paper having a rice area of 30 g / m ² , a surface strength of 20 A, and a smoothness of 200 seconds was subjected to MD by a wrapping machine using a vinyl acetate adhesive.
F was wrapped to produce a decorative board. In order to evaluate the printability of the paper between sheets, gravure printing was performed using a nitrifying cotton-based ink. The same tests and evaluations as in Example 1 were performed, and the results shown in Table 2 were obtained.

Comparative Example 3 A commercially available vinyl chloride film for decorative board was wrapped on MDF with a wrapping machine using a vinyl acetate adhesive to produce a decorative board. In order to evaluate the printability of the vinyl chloride film, gravure printing was performed with a vinyl acetate-based ink. The same tests and evaluations as in Example 1 were performed, and the results shown in Table 2 were obtained.

[0027]

[Table 2]

FIG. 1 and Table 3 show an example of the relationship between the moisture permeability and the coating amount of the clear waterproof resin. This shows the moisture permeability of the one before the supercalendering and the one after the supercalendering, in which the same amount of base paper and the same coating liquid as in Example 1 were used and the coating amount was changed. The super calendar was performed under the same conditions as in Example 1. In addition, the result of applying the paraffin wax-containing SBR latex under the same conditions is also shown for comparison. If the coating amount of the soap-free emulsion-polymerized SBR latex (trade name: Pateracol SB-302, manufactured by Dainippon Ink and Chemicals, Inc.) is less than 5 g / m ² , the surface of the base paper cannot be uniformly covered and coating unevenness is not preferred. . On the other hand, when the coating amount exceeds 25 g / m ² , the drying property is deteriorated, and it becomes necessary to lower the coating speed, which is not preferable in terms of production efficiency. The soap-free emulsion-polymerized SBR latex (trade name Pateracol SB-302, manufactured by Dainippon Ink and Chemicals, Inc.) was coated and supercalendered. Although it falls, it is preferable to apply a super calender to improve the gravure printing suitability and the like. Those coated only with paraffin wax-containing SBR latex have low moisture permeability, but it is necessary to apply a super calender to give gravure printing aptitude, but applying a super calender increases moisture permeability, which is not preferable. . It is considered that this is because the paraffin wax was transferred to the drum of the super calender, and the coating film of the paraffin wax became uneven.

[0029]

[Table 3]

The relationship between the coating amount of other clear waterproof resin and the moisture permeability is almost the same.

[0031]

Since the present invention is configured as described above in detail, it has the following effects. Surface strength specified by JIS P 8129 is 1
A soap-free milk as a clear waterproof resin containing no filler is provided on at least one side of base paper having a smoothness of 200 seconds or more specified in JIS P8119 at 5 to 32A.
Polymerization SBR latex, soap-free emulsion polymerization NBR
Latex, soap-free emulsion polymerization MBR latex
Waterproof coated paper for decorative boards, which is coated with any one of them in a dry weight of 5 to 25 g / m ² , has moisture-proof / waterproof properties, bending strength, inter-sheet strength, smoothness, print gloss, and ink receptivity. Excellent, V-cut plywood, suitable for the production of decorative boards by wrapping machine, also against condensation, water wet, etc., does not swell or curl the substrate, and does not generate mold In addition, a high-quality, high-quality product can be provided at low cost, and can be replaced with a conventional decorative film using vinyl chloride.

[Brief description of the drawings]

FIG. 1 is a diagram showing the relationship between moisture permeability and the amount of clear waterproof resin applied.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI D21H 27/20 D21H 27/20 A E04B 1/66 E04B 1/66 A

Claims (3)

(57) [Claims] 1. A at a defined surface strength in JIS P 8129 is 15～32A, on at least one surface of the base paper defined smoothness in JIS P 8119 is more than 200 seconds, as clear waterproof resin containing no filler Saw
Pre-free emulsion polymerization SBR latex has a dry weight of 5-2
Veneer waterproof coated paper, characterized in that formed by 5 g / m ² coating. 2. A defined surface strength JIS P 8129 is in 15～32A, on at least one surface of the base paper defined smoothness in JIS P 8119 is more than 200 seconds, as clear waterproof resin containing no filler Saw
Pre-free emulsion-polymerized NBR latex has a dry weight of 5-2
Veneer waterproof coated paper, characterized in that formed by 5 g / m ² coating. 3. A defined surface strength JIS P 8129 is in 15～32A, on at least one surface of the base paper defined smoothness in JIS P 8119 is more than 200 seconds, as clear waterproof resin containing no filler Saw
5 to 2% by weight of dry emulsion-polymerized MBR latex
Veneer waterproof coated paper, characterized in that formed by 5 g / m ² coating.