JP3908340B2 - Formaldehyde capture wallpaper and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wallpaper used for a wall surface of a house, a hotel, a public facility or the like and a method for manufacturing the wallpaper.
[0002]
[Prior art]
Conventionally, wallpaper is often used with a backing paper that has a vinyl chloride resin foam layer, a pattern printing layer, and a transparent protective layer in this order. Yes. The base material that constitutes the base material of these wall surfaces is generally wood base material such as wood plywood, wood fiber board, particle board, gypsum base material such as gypsum board, gypsum slag board, pulp cement board, asbestos slate. These include fiber cement boards such as boards, asbestos cement boards and wood chip cement boards, GRC and concrete. However, many base materials that are used to bond wallpaper use materials that generate formaldehyde. For example, wood base materials are bonded by an adhesive, and as this adhesive, an adhesive of urea, melamine or phenolic resin is often used from the viewpoint of adhesive performance and cost. However, these adhesives contain free formaldehyde, and formaldehyde is released by decomposition of the resin. Therefore, formaldehyde is a toxic substance with a strong irritating odor, so-called formalin odor, when wallpaper is pasted on such a wooden base material as it is, and the above wooden base material releases this formaldehyde and impairs the hygienic environment. become. In addition, the adhesive used when bonding the wallpaper to the base material of the wall surface includes those containing formaldehyde as an adhesive stabilizer and preservative, and even when these adhesives are used, There is also a problem that formaldehyde is released into the air, which also impairs the hygienic environment such as indoors.
[0003]
In addition, a paper-based decorative sheet was attached to the interior of the building via an adhesive on a base material made of a wooden base material, such as interior materials such as ceiling materials and flooring materials, doors, fences, and other construction materials. Many decorative materials or decorative plates are used, and formaldehyde is also released into the air from these interior materials and artificial materials, and there is also a problem that the hygienic environment such as the room is impaired.
[0004]
Therefore, many proposals have been made as methods for preventing the release of formaldehyde from these woody base materials. For example, measures such as using a resin that does not contain formaldehyde, such as vinyl acetate resin, or adding a formaldehyde scavenging substance made of an organic amino compound in a resin that generates formaldehyde, such as urea resin, have been taken. Resin that does not contain formaldehyde has a weak adhesive force, so in the case of plywood, there is a problem that the adhesive strength between layers becomes insufficient, and in the case of particle board and wood fiber board, physical properties such as strength change. There was a problem.
[0005]
In addition, when the foamed resin layer is foamed with the foamable resin containing the pyrolytic foaming agent, the wallpaper having the formaldehyde capturing layer formed of the organic amino compound is thermally decomposed or decomposed by heating required for forming the foamed resin layer. There is also the possibility of volatilization, in which case the problem of reducing the function of capturing formaldehyde occurs.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of such problems, and the object of the present invention is to provide a wallpaper using a foaming resin layer containing a pyrolytic foaming agent and the like, and a wallpaper having a formaldehyde-capturing function. It is in providing the manufacturing method.
[0007]
[Means for Solving the Problems]
The solution means of the present invention for achieving the above object is a laminate in which a foamed resin layer and a pattern printing layer are provided on one side of a backing paper, and a formaldehyde capturing layer is provided on the surface of the laminate. It is to formaldehyde capture wallpaper characterized by this.
By adopting such a configuration, the formaldehyde generated from the adhesive used for bonding of the base material, which is the base material of the wall surface, or the sticking of wallpaper to the base material, or the ceiling material, flooring material, etc. is laminated. Since it is trapped and adsorbed by a formaldehyde trapping layer containing a formaldehyde scavenger provided on the surface of the body, it is very unlikely that an irritating odor is caused by formaldehyde.
[0008]
Further, the formaldehyde capturing layer is provided on the other side of the backing paper of the laminate. By doing so, formaldehyde generated from the adhesive used for bonding the base material of the wall surface or sticking the wallpaper to the base material is formaldehyde provided on the other side of the backing paper of the laminate. Since it is trapped and adsorbed by the formaldehyde trapping layer containing the trapping agent, formaldehyde is less likely to be released from the surface side of the wallpaper, and therefore, the irritating odor due to formaldehyde is extremely reduced.
[0009]
Further, the formaldehyde capturing layer may be formed as a surface protective layer on the pattern printing layer, or may be formed on the surface protection layer provided on the pattern printing layer. By doing so, it is possible to efficiently capture and adsorb formaldehyde generated from wood-based base materials used for ceiling materials, flooring materials, etc., and keep the room in a good sanitary environment at all times. it can.
[0010]
Also, a step of providing a foamable resin layer on one side of the backing paper, a step of providing a pattern printing layer on the surface of the foamable resin layer, and a surface protective layer comprising a transparent resin layer as necessary, followed by foaming A formaldehyde-trapping layer, wherein a formaldehyde-trapping layer is applied and formed on at least one surface of the other side of the backing paper, the pattern printing layer, or the upper surface of the surface protective layer. This is a wallpaper manufacturing method. By manufacturing in this way, the formaldehyde trapping layer is not affected by heating for foaming the foamable resin layer made of the resin composition containing the pyrolytic foaming agent. Degradation of formaldehyde trapping performance due to decomposition or volatilization can be prevented, and as a result, formaldehyde trapping and adsorption performance of the formaldehyde trapping layer can be sufficiently exhibited.
[0011]
Further, a step of providing a foamable resin layer on one side of the backing paper, a surface printing layer comprising a pattern print layer on the surface of the foamable resin layer, and a transparent resin layer containing a formaldehyde scavenger as required A heating step for foaming the foamable resin layer, and then forming and forming a formaldehyde-trapping layer on the other side of the backing paper. By manufacturing in this way, formaldehyde capture layers will be formed on both the front and back of the wallpaper, so formaldehyde capture wallpaper that can fully exhibit formaldehyde capture and adsorption performance can be easily and reliably produced. It is.
[0012]
Furthermore, by using a formaldehyde-trapping wallpaper manufacturing method characterized in that the foamable resin layer provided on one side of the backing paper is composed of a resin composition containing a pyrolytic foaming agent, particularly at high temperatures. Formaldehyde that reliably captures and adsorbs formaldehyde even in wallpaper that uses a pyrolytic foaming agent that requires heating and has a high possibility of thermal decomposition or volatilization of the formaldehyde scavenger during heating and foaming It makes it possible to produce capture wallpaper.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
1 to 6 are cross-sectional views showing the laminated structure of the embodiment of the wallpaper of the present invention. 1, 10, 20, 30, 40, 50 are wallpaper, 2 is backing paper, 3 is a foamed resin layer, 4 is The pattern printing layer, 5 represents a surface protective layer, and 6 represents a formaldehyde capturing layer.
[0014]
As shown in FIG. 1, the laminated structure of the wallpaper 1 of the first embodiment of the wallpaper of the present invention is a foamed resin layer 3 on the upper surface of the backing paper 2, and a picture printing layer 4 comprising a solid ink layer 4a and a picture ink layer 4b. And the formaldehyde capturing layer 6 is laminated on the lower surface of the backing paper 2. Here, the formaldehyde capturing layer 6 is laminated on the lower surface of the backing paper 2 after the foamable resin layer is heated and foamed. Thus, the performance of capturing and adsorbing formaldehyde generated from the adhesive used for laminating the wall surface base material and the wallpaper and the base material can be sufficiently exhibited.
[0015]
FIG. 2 shows a laminated structure of the wallpaper 10 according to the second embodiment of the wallpaper of the present invention. The pattern printing comprising the foamed resin layer 3, the solid ink layer 4a and the pattern ink layer 4b on the upper surface of the backing paper 2. The layer 4 is laminated, and the surface protective layer 5 is laminated thereon, and the formaldehyde capturing layer 6 is laminated on the lower surface of the backing paper 2. A surface protective layer 5 made of a transparent resin is formed on the surface for the purpose of imparting physical properties such as abrasion, scratching and contamination to the wallpaper.
[0016]
The backing paper 2 used in the present invention is mainly composed of cellulose fibers, and if necessary, synthetic fibers, inorganic fibers, synthetic pulp, etc. are appropriately blended, self-extinguishing filler, other fillers, dry paper strength enhancer, wet paper It is obtained by making paper by adding a force enhancer, a colorant, a sizing agent, a fixing agent and the like as appropriate, and particularly for vinyl wallpaper having a weight of 70 to 100 g / m ² and a thickness of 0.10 to 0.12 mm. Flame retardant paper is preferably used.
[0017]
Examples of the resin used for the foamable resin layer 3 of the present invention include polyvinyl chloride, a copolymer of polyvinyl chloride as a main component, vinyl acetate, acrylic acid, an ethylene vinyl acetate copolymer, and the like. A mixture of the coalescence and polyvinyl chloride is appropriately mixed with a stabilizer, a plasticizer, and a dispersant to form a paint, or dissolved in a solvent to form a paint, or a vinyl acetate aqueous emulsion, Uses water-soluble emulsion paints by adding inorganic fillers and metal hydrates to one or more resin mixtures of urethane-based aqueous emulsions, acrylic-based aqueous emulsions, and polyolefin-based aqueous emulsions. Is possible.
[0018]
Moreover, as a foaming agent used for the foamable resin layer 3, a thermal decomposition type that decomposes at a temperature below the temperature at which the resin used for the foamable resin layer 3 completely melts and gels and above the softening point of the resin is used. Or a microcapsule type containing a gas or a low boiling point organic solvent.
Examples of the thermal decomposition type foaming agent, azodicarbonamide, azobisisobutyronitrile, azo foaming agents, such as diazoaminobenzene, N, N ^'- dimethyl -N, ^N' - such as dinitrosoterephthalamide Nitroso-based blowing agents, benzenesulfonyl hydrazide, toluenesulfonyl hydrazide, sulfonyl hydrazide-based blowing agents such as P, P'-oxybisbenzenesulfonyl hydrazide, sodium bicarbonate, etc. Examples thereof include organic foaming agents such as polyacrylonitrile, vinylidene chloride-acrylonitrile copolymer, phenol resin, and epoxy resin.
In the case of pyrolytic foaming agents, the decomposition temperature is adjusted by using a decomposition aid such as oxalic acid, citric acid, tartaric acid, urea, zinc compound, copper compound, etc. It is desirable to decompose and generate gas.
[0019]
Moreover, colorants such as titanium oxide, carbon black, and cyanine blue, fillers such as calcium carbonate and clay, and flame retardants such as antimony trioxide and molybdenum oxide can be appropriately blended.
[0020]
The pattern printing layer 4 applied to the foamed resin layer 3 is provided with a solid ink layer 4a for printing on the entire surface and a pattern ink layer 4b for expressing, for example, wood grain, stone grain, natural leather surface pattern, cloth pattern, abstract pattern, and the like. As the ink vehicle, known ones can be used, for example, a single or a plurality of resin systems such as acrylic, vinyl chloride, vinyl chloride-vinyl acetate copolymer, chlorinated polyolefin, nitrocellulose, and urethane. If necessary, a mixture of a colorant such as a pigment or a dye, an extender pigment, a solvent, or the like can be used. Although not shown in the figure, in order to impart design properties, a composition containing a compound that prevents part of the pattern ink layer 4b from decomposing the foaming agent or hinders the action of the foaming accelerator, that is, a foam-suppressing ink is used. Then, a foam suppression pattern may be formed on the foamable resin layer, and the foam may be heated and foamed to form a foam in which the foam suppression pattern portion is recessed, thereby performing foam suppression embossing by a chemical reaction.
[0021]
The surface protective layer 5 made of a transparent resin used in the present invention may be a resin having a higher softening point than the resin constituting the foamed resin layer 3. The resin as the surface protective layer 5 can be formed in a form in which an ink form or a sol form is applied. For example, an ink made of polyurethane, polyester, epoxy resin, high molecular weight polyvinyl chloride resin or the like cross-linked with isocyanate, amine or the like is applied and dried, and is cured and cross-linked with heat or the like as necessary. Alternatively, a film such as polyvinyl chloride, polyethylene terephthalate, ethylene-vinyl alcohol copolymer, acrylic resin, or fluororesin may be laminated with a known appropriate adhesive such as a two-component curable urethane or polyester adhesive. good. Although not shown, the surface of the surface protective layer 5 may be provided with a concavo-convex pattern with an embossed plate having convex portions in order to impart higher design characteristics.
[0022]
Next, the formaldehyde trapping layer 6 captures formaldehyde in a solvent type or emulsion type vehicle such as nitrified cotton / alkyd, cellulose, vinyl chloride, vinyl chloride-vinyl acetate, acrylic, acrylic polyol, ester, etc. It can be formed by coating a flame retardant backing paper with a coating liquid kneaded by arbitrarily adding a substance having an action and additives. A typical substance having formaldehyde scavenging action is an organic amino compound, and this compound reacts easily with formaldehyde, and the product does not dissociate formaldehyde and is a harmless and stable substance. For example, urea, ethylene Urea, propylene urea, 5-hydroxypropylene urea, 5-methoxypropylene urea, 5-methylpropylene urea, parabanic acid (glyoxal monourene), 4,5-dimethoxyethylene urea, pyrrolidine, piperidine, morpholine, dicyandiamide, 2- Examples thereof include amines such as hydrazobenzothiazole or a derivative thereof, amides, and imides. Moreover, you may add ammonium hydroxide as needed. Further, the formaldehyde-trapping substance may be supported on an inorganic powder such as silica, talc, clay, activated carbon, zeolite, sepiolite.
[0023]
The formaldehyde trapping layer 6 can be easily formed by a well-known roll coat method with a coating liquid obtained by kneading the formaldehyde scavenger composed of the organic amine compound on the lower surface of the backing paper 2 of the laminate. Further, as shown in FIG. 3 to be described later, the form print capturing layer 4 is formed on the upper surface of the surface protective layer 5 by a sponge roll coating method, a knife coating method or the like as shown in FIG. 6 can also be formed easily. The formaldehyde trapping layer 6 in the case of FIG. 3 may have a characteristic as a surface protective layer. Further, the foamable resin layer is pressurized with an embossing plate simultaneously with heat foaming, and the surface of the concavo-convex pattern (not shown) formed on the upper surface of the pattern printing layer 4 or the surface protective layer 5 is a sponge roll coating method or knife coating method. As a result, it is possible to apply more to the recesses and improve surface properties such as contamination and scratch properties.
[0024]
The laminated structure of the wallpaper 20 of the third embodiment of the wallpaper of the present invention is shown in FIG.
Hereinafter, the same reference numerals as those of the components already described are used, and redundant descriptions are omitted.
The wallpaper 20 is different from the wallpaper 1 of the first embodiment or the wallpaper 10 of the second embodiment in that the formaldehyde capturing layer 6 is formed. That is, the wallpaper 20 shows that the formaldehyde capturing layer 6 is formed by a coating material in which a formaldehyde scavenger is added to a resin that forms a surface protective layer provided on the upper surface of the picture printing layer 4. By containing, formaldehyde generated from wooden base materials used for ceiling materials, flooring materials, etc. can be efficiently captured and adsorbed, and the room is always kept in a good sanitary environment. Can do. In addition, since it is not necessary to provide a separate formaldehyde capturing layer, the number of man-hours is reduced, and the cost is reduced.
[0025]
The laminated structure of the wallpaper 30 of the fourth embodiment of the wallpaper of the present invention is shown in FIG.
The wallpaper 30 of the present embodiment is formed by laminating the foamed resin layer 3 and the pattern printing layer 4 composed of the solid ink layer 4a and the pattern ink layer 4b on the upper surface of the backing paper 2, and the surface protective layer 5 is laminated thereon, In order to effectively capture and adsorb formaldehyde generated from woody base materials used for ceiling materials, flooring materials, etc., with a structure in which a formaldehyde capturing layer 6 is laminated on the upper surface of the surface protective layer 5 The indoor environment can always be in a good sanitary environment.
[0026]
The laminated structure of the wallpaper 40 of 5th Embodiment of the wallpaper of this invention is shown in FIG.
The wallpaper 40 of the present embodiment has a configuration in which the formaldehyde capturing layer 6 is laminated on the lower surface of the backing paper 2 as in FIG. 2, and further the formaldehyde capturing layer 6 is formed on the upper surface of the surface protective layer 5 as in the wallpaper 30 in FIG. It shows that the formaldehyde capturing layer 6 is provided on both the front and back sides of the laminate in which the foamed resin layer 3, the pattern printing layer 4, and the surface protective layer 5 are laminated in this order on the surface of the backing paper 2. . Since the foamed resin layer 3 provided on the upper surface of the backing paper 2 has a property of hardly allowing the permeation of formaldehyde, the formaldehyde capturing layer 6 provided on the backing paper 2 is bonded to the base material, which is a base material, or to the base material. Captures and adsorbs formaldehyde generated from the adhesive used to attach the wall paper, prevents it from being released into the air, and a formaldehyde capturing layer 6 provided on the upper surface of the surface protective layer 5 is provided from the ceiling and flooring. In order to capture and adsorb formaldehyde in the released air, the indoor environment can always be in a good sanitary environment.
[0027]
The laminated structure of the wallpaper 50 of the sixth embodiment of the wallpaper of the present invention is shown in FIG.
The wallpaper 50 of the present embodiment has a configuration in which the formaldehyde capturing layer 6 also serving as the surface protective layer 5 is formed on the upper surface of the pattern printing layer 4 similar to FIG. 3, and the formaldehyde capturing layer 6 on the other surface of the backing paper 2. In the present invention, the foamed resin layer 3 and the pattern printing layer 4 are laminated in this order on the surface of the backing paper 2 and the formaldehyde-trapping layer 6 is provided on both front and back surfaces of the laminate. This has the same effect as the wallpaper 40 of the fifth embodiment. The formaldehyde capturing layer 6 provided on the upper surface of the pattern printing layer 4 is formed at the same time as the pattern printing layer 4 is formed, and the formaldehyde capturing layer 6 is formed on the other side of the backing paper 2 later. Is also good.
[0028]
However, a foamable resin obtained by adding a pyrolytic foaming agent to a vinyl chloride resin is applied to the backing paper 2 and heated to a temperature higher than the foaming temperature of the pyrolytic foaming agent to foam the foamable resin, and the foamed resin layer 3 When the formaldehyde scavenger that forms the formaldehyde scavenging layer 6 is made of an organic amino compound, the foaming temperature of the pyrolytic foaming agent of the vinyl chloride resin-based foamed resin is as high as 180 to 220 ° C. Since the organic amino compound has a relatively low melting point of 90 to 100 ° C., a foaming resin is formed by forming a formaldehyde capturing layer made of an organic amino compound before heating and foaming the foaming resin layer made of a vinyl chloride resin. It is said that organic amino compounds are thermally decomposed by the heat that melts by heating and decomposes the foaming agent, or the function of volatilizing and capturing formaldehyde is reduced. The result.
[0029]
Therefore, in the present invention, when producing a wallpaper in which a formaldehyde capturing layer made of an organic amino compound is formed and a foamed resin layer, a pattern printing layer, and a surface protective layer are formed on the surface of the backing paper, A foamable resin layer containing a pyrolytic foaming agent, a print printing layer, and a surface protective layer were laminated on the surface and heated at a high temperature to foam the foamable resin layer containing the pyrolytic foaming agent to form a foamed resin layer Later, by applying and forming a formaldehyde capturing layer comprising an organic amino compound on the other side of the backing paper and / or the pattern printing layer or the upper surface of the surface protective layer, a wallpaper having excellent formaldehyde scavenging properties can be obtained. it can.
[0030]
【Example】
Example 1
A flame retardant backing paper having a weight of 70 g / m ² (TTK-70 manufactured by Tokushu Paper Industries Co., Ltd.) is coated with a vinyl chloride paste paint containing a foaming agent azodicarbonamide on the flame retardant backing paper using a comma coater. It is coated to a film thickness and gelled at 160 ° C for 1 minute, on which a colored solid ink layer and a pattern ink layer are printed by gravure printing using a vinyl chloride ink, and acrylic on the surface of the pattern ink layer A transparent paint was applied with a gravure coater so as to be 1.8 g / m ² (during drying) and then heat-treated at 220 ° C. for 40 seconds to produce a wallpaper. Next, a formaldehyde-trapping layer was formed on the other side of the flame-retardant backing paper of the wallpaper obtained above to prepare a formaldehyde-trapping wallpaper. The formaldehyde scavenging layer is formed by using an acrylic resin-based methanol solution (manufactured by The Inktec Co., Ltd., FC coating liquid C) containing a formaldehyde scavenger (manufactured by Miki Riken Co., Ltd., FC-18-6) as a gravure coater. And 3.6 g / m ² (when dry).
[0031]
Example 2
A flame retardant backing paper having a weight of 70 g / m ² (TTK-70 manufactured by Tokushu Paper Industries Co., Ltd.) is coated with a vinyl chloride paste paint containing a foaming agent azodicarbonamide on the flame retardant backing paper using a comma coater. Coating to a film thickness and gelling at 160 ° C / min, printing a colored solid ink layer and a pattern ink layer by gravure printing using a vinyl chloride ink, and a surface containing a formaldehyde scavenger Protective paint (Nishin Chemical Co., Ltd., Vinyblan S-800) was applied with a gravure coater to 2.0g / m ² (during drying) and then heat-treated at 220 ° C for 40 seconds to foam the wallpaper. Produced. Next, in the same manner as in Example 1, an acrylic resin-based methanol solution containing a formaldehyde scavenger (FC-18-6, manufactured by Miki Riken Co., Ltd.) on the other side of the flame-retardant backing paper obtained above was used. -Inktec Co., Ltd. product, FC coating liquid C) was coated with a gravure coater so as to be 3.6 g / m ² (when dried) to prepare a formaldehyde-trapping wallpaper.
[0032]
Comparative Example 1
A flame retardant backing paper having a weight of 70 g / m ² (TTK-70 manufactured by Tokushu Paper Industries Co., Ltd.) is coated with a vinyl chloride paste paint containing a foaming agent azodicarbonamide on the flame retardant backing paper using a comma coater. It is coated to a film thickness and gelled at 160 ° C for 1 minute, on which a colored solid ink layer and a pattern ink layer are printed by gravure printing using a vinyl chloride ink, and acrylic on the surface of the pattern ink layer A transparent paint was applied with a gravure coater so as to be 1.8 g / m ² (when dried), and further heat-treated at 220 ° C. for 40 seconds to produce a wallpaper.
[0033]
Adhesive for wallpaper (Yayoi Chemical Co., Ltd.) on both front and back sides of 2.5mm wood plywood in which each wallpaper of Examples 1 and 2 and Comparative Example 1 was laminated with lauan veneer with urea adhesive , Aminol), respectively. Then, cut out 12 pieces of 5 × 15 cm specimens from each of the pasting plates, put the 12 specimen pieces into a 24 cm diameter desiccator, and put 300 ml of distilled water in a petri dish placed at the center of the bottom of the desiccator. After standing at 20 ° C. for 24 hours, the amount of formaldehyde absorbed in distilled water was measured by the acetylacetone colorimetric method. As a result of measuring the formaldehyde concentration in this way, the formaldehyde emission amount was 1.4 mg / l for the wallpaper of Example 1, 0.6 mg / l for the wallpaper of Example 2, and 4.7 mg / l for the wallpaper of the comparative example. Met.
[0034]
【The invention's effect】
As described above, the wallpaper of the present invention can effectively capture formaldehyde generated from the adhesive used for the wall base material or the wallpaper to be adhered to the base material, as well as the ceiling material and floor material. Formaldehyde released from the like can also be effectively captured. In addition, the formaldehyde-capturing layer is applied and formed after the foamable resin is heated and foamed, so that the production method of the present invention exhibits the performance of effectively capturing formaldehyde, particularly a pyrolytic foaming agent. Even in the case of using a filled resin composition, the effect is surely obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a laminated structure of a first embodiment of wallpaper of the present invention.
FIG. 2 is a cross-sectional view showing a laminated configuration of a second embodiment of the wallpaper of the present invention.
FIG. 3 is a cross-sectional view showing a laminated structure of a third embodiment of the wallpaper of the present invention.
FIG. 4 is a cross-sectional view showing a laminated configuration of a fourth embodiment of the wallpaper of the present invention.
FIG. 5 is a cross-sectional view showing a laminated configuration of a fifth embodiment of the wallpaper of the present invention.
FIG. 6 is a cross-sectional view showing a laminated structure of a sixth embodiment of the wallpaper of the present invention.
[Explanation of symbols]
1, 10, 20, 30, 40, 50 Wallpaper 2 Backing paper 3 Foamed resin layer 4 Pattern printed layer 4a Solid ink layer 4b Pattern ink layer 5 Surface protective layer 6 Formaldehyde capturing layer

Claims (5)

In a laminate in which a foamed resin layer and a pattern printing layer are provided on one side of the backing paper , a formaldehyde capturing layer is provided on the surface of the laminate and the other side of the backing paper of the laminate. And formaldehyde capture wallpaper. The formaldehyde-trapping wallpaper according to claim 1 , wherein the formaldehyde-trapping layer is formed as a surface protective layer on the pattern printing layer. The formaldehyde-trapping wallpaper according to claim 1 , wherein the formaldehyde-trapping layer is formed on a surface protective layer provided on the pattern printing layer.   A step of providing a foamable resin layer on one side of the backing paper, a step of providing a surface protective layer comprising a pattern printing layer and a transparent resin layer containing a formaldehyde scavenger on the surface of the foamable resin layer, and then foamability A heating method for foaming a resin layer, and then applying and forming a formaldehyde trapping layer on the other side of the backing paper. The method for producing formaldehyde-trapping wallpaper according to claim 4 , wherein the foamable resin layer provided on one side of the backing paper is made of a resin composition containing a pyrolytic foaming agent.

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