JP2007077526A - Backing paper for wall paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backing paper for a wall paper, hardly curling even on applying paste, without forming apertures after pasting, also easy for peeling off at a re-covering time, and showing a uniform backing paper layer remaining on the wall after removal. <P>SOLUTION: This backing paper for the wall paper is to make the wall paper by installing a decoration layer on its one side surface. The backing paper is characterized by having 5-40 mass% content of a thermoplastic synthetic fiber based on the total of the fibers and also containing a fatty acid amine resin and/or fatty acid amide resin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a backing paper for wallpaper.

  The wallpaper is affixed to the wall for a long period of time in order to beautify the room in general houses, hotels, hospitals, and the like. The wallpaper includes a vinyl wallpaper, an olefin wallpaper, a fabric wallpaper, a paper wallpaper, an inorganic wallpaper, and the like. These wallpapers include a decorative layer such as a vinyl layer, an olefin layer, a fabric layer, a paper layer, an inorganic layer, and the decorative layer. It is comprised by the backing paper for hold | maintaining.

  These wallpapers are glued to the wall with starch or vinyl acetate resin water-based glue during construction, but the backing paper absorbs moisture in the glue during the gluing process, so the wallpaper becomes soft or the backing paper May increase due to increased moisture. For these reasons, the wallpaper is curled, making it difficult to apply to the wall, and causing problems such as the tendency of wrinkling after application. Furthermore, since the backing paper contracts when the glue dries, there is a problem in that a gap (opening) is generated at the joint portion between the adjacently bonded wallpapers, and the design properties after construction are impaired.

  In addition, after long-term use, it is required that the wallpaper is easily peeled off during the wallpaper replacement work, and that the paper layer of the backing paper remaining on the wall surface after the peeling is uniform. Since most of the wallpaper repainting work is done manually, if the peeling resistance when peeling is large, it will be difficult to remove, and the peeled marks will remain unevenly on the wall, so it will take a considerable amount of time to correct the groundwork. It becomes inefficient. For this reason, there has been a demand for a backing paper that has low peeling resistance when peeled and can be peeled uniformly by the backing paper layer.

Synthetic fibers such as backing paper (Patent Documents 1, 2, 3, 4, 5), polyolefins, polyesters, polyamides, etc. blended with inorganic fibers such as glass fibers that are less stretched by moisture to improve the dimensional stability of the backing paper (Patent Documents 6, 7, 8, 9, and 10) are disclosed.
However, since inorganic fibers such as glass fibers do not have self-adhesive properties, the fibers tend to fall off the sheet, resulting in poor workability, and fiber fluffing occurs during papermaking, wallpaper processing, and wallpaper construction. In addition, since the glass fiber is rigid, when it comes into contact with the skin, a tingling irritation occurs, which causes discomfort to humans. Therefore, backing paper containing inorganic fibers has not been widely used.
Japanese Examined Patent Publication No. 7-122236 JP-A-8-1000039 JP-A-8-325997 Japanese Patent Publication No. 8-26631 Japanese Patent No. 3252265 JP-A-5-59696 JP-A-5-59698 JP-A-5-59699 JP-A-8-127999 JP 2003-3397 A

  Synthetic resin fibers are not a problem in the papermaking process, but wallpaper is generally used for decoration. During production, foaming is applied to the vinyl chloride paste layer or olefin resin layer of the decorative layer at a high temperature of about 200 ° C. Since heat treatment such as embossing is performed, the synthetic fibers are softened and fused, and the paper interlayer strength of the backing paper is increased. As a result, the peel strength of the wallpaper is increased and the peelability is impaired.

In addition, when changing the wallpaper, in order to make it easy to peel lightly and uniformly between the paper layers of the backing paper, for example, a paper or a paper sheet containing a filler is coated with a flame retardant aqueous solution using starch or polyvinyl alcohol in combination as a binder. A method for producing a flame retardant paper for backing a lightly peelable vinyl wallpaper that has been subjected to flame retardant treatment is disclosed (Patent Document 11). However, the present invention is limited to flame retardant paper and a specific filler and The application of a specific binder is indispensable, and there are drawbacks such as severe restrictions on manufacturing.
JP-A-6-73700

In addition, a base paper mainly composed of an inorganic filler and cellulose fiber is impregnated with a flame retardant to form a base paper, and an internal bond strength of the base paper is set to 100 by providing a coating layer mainly composed of an inorganic pigment and a binder on one side. Although a backing paper for wallpaper having a strength of ˜200 g / 15 mm and stronger than the internal bond strength of the coating layer has been disclosed (Patent Document 12), it is also possible to use a flame retardant paper as a base paper. Not only is it essential, but there is a major limitation in manufacturing such as providing a pigment coating layer on one side of flame retardant paper, and the use is limited to flame retardant paper, so the field of commercialization is limited was there.
Japanese Unexamined Patent Publication No. 7-197399

  Therefore, the object of the present invention is not only that the wallpaper is not easily curled even if glue is applied at the time of construction, but also does not cause opening after being applied, and is easy to peel off when the wallpaper is replaced, and remains on the wall after peeling. It is an object of the present invention to provide a wallpaper backing paper having a uniform backing paper layer.

As a result of earnestly examining the above object, the present inventors specify the ratio of synthetic fibers in the total fiber content in the backing paper for wallpaper produced by a paper machine, and when a specific fatty acid resin is contained, It has been found that the dimensional stability of the wallpaper becomes good and the peelability can be improved at the same time, and the present invention has been achieved.
That is, the present invention is a wallpaper backing paper for providing a decorative layer on one side to make a wallpaper, wherein the backing paper has a thermoplastic synthetic fiber content of 5 to 40% by mass in the total fiber content. In addition, a backing paper for wallpaper characterized by containing a fatty acid amine resin and / or a fatty acid amide resin, and wallpaper using the same.

In addition, it is preferred that the backing paper of the present invention has a Steecht sizing degree of 10 seconds or more and a paper interlayer strength after heating of 20 to 40 N / m. Furthermore, it is preferable to apply a coating liquid mainly composed of a water-soluble resin binder and / or a water-dispersible resin binder on at least one side of the backing paper surface, and the basis weight is 40 to 120 g / m ^2. preferable.

  The backing paper for wallpaper of the present invention is excellent in workability because it is not curled at the time of construction, and can be improved in appearance because no openings are formed after application. In addition, since it can be peeled lightly and evenly between the backing paper layers, the labor of the operator can be reduced and the work can be performed efficiently.

The backing paper for wallpaper of the present invention has a thermoplastic synthetic fiber content of 5 to 40% by mass in the total fiber content. In this way, by using thermoplastic synthetic fibers that do not easily expand and contract due to moisture, it is possible to prevent the wallpaper from curling due to water absorption and the opening after drying. When the thermoplastic synthetic fiber is less than 5% by mass, the dimensional stability is not sufficient, and curling and opening are likely to occur. Moreover, when the content rate of a thermoplastic synthetic fiber exceeds 40 mass%, the paper interlayer strength after a heating will become high and peelability will be impaired.
Furthermore, when the number of synthetic fibers that do not have self-adhesion increases, the parts that come into direct contact with the backing paper, such as wet press parts, dryer parts, size press rolls, canvases, calendar rolls, etc., fall off or melt during paper making. It is not preferable because it becomes dirty due to the like.

  As a form of the thermoplastic synthetic fiber used by this invention, it is preferable that the length of a fiber is 0.5-20 mm. If it is less than 0.5 mm, the paper-making property is good, but the dimensional stability of the backing paper is lowered. If the fiber length exceeds 20 mm, synthetic fibers or synthetic fibers and wood pulp fibers are entangled in piping, pulp storage tank, paper machine stock inlet, dewatering wire, etc. during the preparation process such as fiber disaggregation and dispersion. As a result, it becomes easy to form a flock, and the formation is easily deteriorated and the paper is easily cut.

  Specific examples of the thermoplastic synthetic fiber used in the present invention include polyolefin resin fibers such as polyethylene and polypropylene, polyester resin fibers such as polyethylene terephthalate, polyamide resin fibers such as nylon, and acrylic resins such as polyacrylonitrile. Examples thereof include halogen-containing resin fibers such as fibers, polyurethane-based resin fibers, and polyvinyl chloride. Also used are synthetic fibers copolymerized with the above thermoplastic synthetic resins, or composite fibers containing two or more different thermoplastic synthetic resins in a single fiber having a core-sheath structure, a sea-island structure, etc. can do. These synthetic fibers may be used alone or in combination.

  It contains a fatty acid amine resin and / or a fatty acid amide resin to be contained in the backing paper of the present invention. The resin is usually present almost uniformly throughout the backing paper, but is not limited thereto. As the fatty acid amine resin, a quaternary ammonium salt of a condensate of higher fatty acid, polyalkylene polyamine and epichlorohydrin is preferably used. Examples of the quaternary ammonium salt of the condensate include higher fatty acids (fatty acids having 8 to 24 carbon atoms such as stearic acid, palmitic acid, lauric acid, and behenic acid), polyalkylene amines (for example, diethylenetriamine, triethylenetetramine). Amine, dipropylenetriamine, tripropylenetetraamine, tetraethylenepentamine, 1,1-diethylethylenetomiamine, 1,1-dimethylethylenetriamine, 1,1-diethylethylenetetraamine, 1,1-dimethylpropylenetriamine) And a resin polymerized from epichlorohydrin. The molar ratio of the higher fatty acid, polyalkyleneamine, and epichlorohydrin is preferably in the range of (1-3): 1: (0.2-3), respectively.

In the present specification, a compound polymerized from higher fatty acid and polyalkyleneamine (higher fatty acid / polyalkyleneamine) and a compound synthesized from higher fatty acid, polyalkyleneamine and dicarboxylic acid (higher fatty acid / polyaminoamine). Amino groups (—NH ₂ , —NH—) present in the polyamide) are referred to as “active amino groups”. In the condensation reaction of a higher fatty acid, a polyalkylene polyamine, and epichlorohydrin, the active amino group produced during the polymerization of the higher fatty acid and the polyalkylene amine reacts with epichlorohydrin. In this case, it is preferable that the addition amount of epichlorohydrin is 0.2-3 mol with respect to an active amino group.

As the fatty acid amide resin, it is preferable to use a quaternary ammonium salt of a higher fatty acid / polyaminopolyamide / epichlorohydrin condensate. Examples of the quaternary ammonium salt of the condensate include higher fatty acids (fatty acids having 8 to 24 carbon atoms, such as lauric acid, stearic acid, oleic acid, and behenic acid), polyalkylene amines (for example, diethylenetriamine, triethylenetetramine). Amines, tetraethylenepentamine, iminobispropylamine), dicarboxylic acids (eg, succinic acid, malonic acid, succinic acid, maleic acid, fumaric acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid) And a resin polymerized from epichlorohydrin. In this case, a polyaminopolyamide is produced by the reaction between the polyalkyleneamine and the dicarboxylic acid. The molar ratio of the higher fatty acid, polyalkyleneamine, and dicarboxylic acid is preferably in the range of 1: (0.2 to 0.3): (0.01 to 0.5), respectively. Moreover, it is preferable to contain epichlorohydrin only by the quantity which makes 0.2-3 molar equivalent react with an active amino group like the above.
The number of carbon atoms of the higher fatty acid moiety in the fatty acid amine resin and / or fatty acid amide resin used in the present invention is preferably 8-24. When the number of carbon atoms is less than 8, the strength between the paper layers becomes high, and the peel strength tends to deteriorate. Moreover, when carbon number exceeds 24, the dispersibility with respect to water and emulsifying property will fall, and there exists a tendency for resin to isolate | separate and settle.

  The content of the fatty acid amine-based resin and / or fatty acid amide-based resin in the fiber content of the backing paper for wallpaper is preferably 0.005 to 2% by mass based on the absolute dry mass. If the content of the resin is less than 0.005% by mass, sufficient peelability cannot be obtained, and if the content exceeds 2% by mass, the strength of the backing paper decreases, which is not preferable.

  The backing paper for wallpaper of the present invention preferably has a Steecht size of 10 seconds or more. If the Steecht sizing degree is less than 10 seconds, an adhesive such as starch paste or vinyl acetate tends to penetrate into the paper layer of the backing paper, which is not preferable because peeling tends to be heavy. If the Steecht sizing degree is 10 seconds or more, the penetration of the glue into the paper layer can be suppressed and the peelability can be kept good.

A sizing agent is used for the backing paper of the present invention in the same manner as ordinary paper. The sizing agent may be added internally or externally. Examples of sizing agents include rosin sizing agents, rosin emulsion sizing agents, and alpha carboxymethyl saturated fatty acids in the case of acidic papermaking. In the case of neutral papermaking, rosin for neutral papermaking. Examples thereof include sizing agents, alkyl ketene dimers, alkenyl succinic anhydrides, and cationic polymer sizing agents. The addition amount of the sizing agent is not particularly limited, and it may be 10 seconds or more in terms of the Stechit sizing degree. For example, when the basis weight is 60 g / m ² , it is preferable to add 0.35% by mass or more of the rosin-based sizing agent with respect to the fiber content.

  It is preferable that the paper interlayer strength of the backing paper of the present invention after heating a decorative layer described later is 20 to 40 N / m. If it is less than 20 N / m, the strength between the paper layers is too low. On the other hand, if it exceeds 40 N / m, the strength between the paper layers becomes too strong, and it is difficult to peel off from the wall, and the decorative layer such as the upper vinyl chloride layer can be easily removed.

  In the present invention, in order to increase the surface strength of the backing paper and prevent fluffing, it is preferable to apply at least the surface of the decorative layer side with a coating liquid mainly composed of a water-soluble binder and / or a water-dispersible resin binder. For example, when producing vinyl wallpaper, a vinyl chloride paste is applied to the surface of the backing paper, and after the vinyl chloride paste is cured, it is subjected to a printing process so that the vinyl chloride layer becomes a decorative layer. In this case, if the surface strength of the backing paper is low, the fibers on the paper surface fluff during the coating, and the fluffed portion protrudes on the surface of the wallpaper after curing, causing printing failure.

As the water-soluble binder, various modified starches such as oxidized starch and enzyme-modified starch, polyvinyl alcohol, carboxymethyl cellulose, casein and the like can be used as appropriate.
As the water-dispersible binder, styrene / butadiene copolymer latex, methyl methacrylate / butadiene copolymer latex, acrylic emulsion, vinyl acetate emulsion and the like can be appropriately used.
In this case, the binder may be used alone, but may be used by mixing with various pigments such as clay, kaolin, calcium carbonate and titanium dioxide.
The coating amount of the binder is preferably 0.2 to 10 g / m ² in terms of solid content. When the amount is less than 0.2 g / m ² , the fiber fuzz increases. Further, if it exceeds 10 g / m ² , all the fibers are covered with the binder layer, so that the anchor effect is lost between the vinyl chloride paste and the paper layer, and the backing paper is difficult to peel off between the paper layers when peeled from the wall.

The basis weight of the backing paper of the present invention is preferably 40 g / m ² or more and 120 g / m ² or less. If the basis weight is less than 40 g / m ² , the strength is low, so that paper breakage is likely to occur during processing. On the other hand, if the basis weight exceeds 120 g / m ² , it tends to be too hard when processed into wallpaper, making construction difficult.

Examples of fiber components other than the thermoplastic synthetic fibers used in the backing paper of the present invention include soft pulp, hardwood chemical pulp, mechanical pulp, and wood pulp such as recycled pulp obtained from waste paper, bast pulp, linter pulp Natural pulp such as non-wood pulp such as hemp pulp can be used, but wood pulp is preferably used in terms of quality and cost.
Further, fixing agents, dry paper strength agents, wet paper strength agents, fillers, yield improvers, dyes, pigments and the like can be used as internal additives as long as the quality is not affected. Furthermore, surface paper strength agents, dyes, pigments and the like can be used as external chemicals to be applied or impregnated with a size press or the like.

  The wallpaper of the present invention can be obtained by providing a decorative layer on the upper layer of the backing paper of the present invention. For example, a vinyl wallpaper provided with a vinyl layer as a decorative layer, an olefin wallpaper provided with an olefin layer, a woven wallpaper provided with a fabric layer, a paper wallpaper provided with a paper layer, an inorganic wallpaper provided with an inorganic layer, and the like. In any case, after providing a resin layer as a decorative layer, printing is performed as necessary, and heating to about 200 ° C. is performed to perform foaming or embossing to obtain a decorative layer.

EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not limited by this.
About the backing paper for wallpaper obtained by each Example and the comparative example, the characteristic test was done with the following method. The results are summarized in Table 1.

1. Water elongation: The test piece was conditioned at 23 ° C. and 50% R / H atmosphere, and the length of the test piece in the horizontal direction of papermaking was measured. The test piece was immersed in pure water, left for 1 hour, then taken out, and the lateral length immediately after taking out was measured. The water elongation (%) was determined by the following formula.
Water elongation (%): (length after water immersion-length before water immersion) / length before water immersion x 100
2. Interlaminar strength of paper (1) Normal state: Cellophane tape was applied to both sides of the backing paper in an atmosphere of 23 ° C. and 50% R / H, and cut into a 15 mm width in the papermaking direction to obtain a test piece. A cut was made between the paper layers with a cutter so as to peel between the paper layers at the time of measurement, and the tensile strength was measured at an angle of 90 degrees according to JIS P8113.
(2) After heating: The test piece was heat-treated at 170 ° C. for 2 minutes in a blow dryer, and then measured in the same manner as in the normal state.
3. Steffith sizing: according to JIS P 8122.

4). Workability, dimensional stability, and peelability A vinyl chloride paste made of vinyl chloride resin, plasticizer (phthalate ester), calcium carbonate, titanium dioxide, mineral spirit, etc. is applied to the surface of the backing paper to a coating thickness of 250 μm. It was made to gel by heating at 180 ° C. for 2 minutes. The obtained vinyl wallpaper was cut into a length of 1 m and a width of 95 cm to prepare a sample.
(1) Workability Prepare two samples, apply starch-based Yayoi Chemical's A glue on the backing paper, and paste it on a 2m wide and 1m long veneer so that the edges of the two sheets of paper overlap. The overlapping part was cut with a cutter so that the joints could not be seen. In this work, the evaluation was made based on whether or not the wallpaper was curled.
Evaluation
○: No curling ×: Curling (2) Dimensional stability After construction, leave for 7 days in an atmosphere of 23 ° C and 50% R / H for complete drying. Opening occurs at the joints after drying. It was evaluated by whether or not.
Evaluation
○: No opening X: Opening (3) Peelability The ease of peeling when the wallpaper was peeled from the veneer board and the appearance of the backing paper remaining on the veneer board were observed.
Evaluation
○: Light peeling and uniform peeling ×: Heavy peeling and not uniform peeling

Bleached kraft pulp NBKP (Canadian standard freeness (CSF) 500 ml) 55% by mass, LBKP (CSF 500 ml) 30% by mass, fiber length 5 mm core sheath fiber (trade name: N-701S, core: polyester fiber, After adding a sulfuric acid band so that pH becomes 4.5 in the pulp slurry which mix | blended 15 mass% of scabbard: Polyethylene and Kuraray Co., Ltd., alpha carboxymethyl saturated fatty acid salt (brand name: 0.15% by mass of NSP-S (manufactured by Seiko PMC) was added. Furthermore, 0.2% by mass of polyamide / epichlorohydrin resin (trade name: WS-547, manufactured by Seiko PMC Co., Ltd.) was added as a wet paper strength agent, and then fatty acid amine resin (trade name: N-815, Seiko PMC). 0.3% by mass) was added.
The obtained mixture was used for paper making using a long paper machine. In addition, 1.5% by mass of polyvinyl alcohol (trade name: Poval 117, manufactured by Kuraray Co., Ltd.) was applied with a size press in the middle of the process.

The basis weight of the formed backing paper was 65 g / m ² , the water elongation was 0.5%, the paper interlayer strength was 20 N / m in the normal state, 35 N / m after heating, and the sizing degree was 35 seconds. A vinyl chloride paste was applied to the backing paper, and then heated at 180 ° C. for 2 minutes to make a wallpaper. The workability and peelability of this wallpaper were evaluated.

A backing paper was prepared and evaluated in the same manner as in Example 1 except that the amount of fatty acid amine-based resin N-815 added was 0.6% by mass. The basis weight of the formed backing paper was 65 g / m ² , the water elongation was 0.48%, the paper interlayer strength was 15 N / m in the normal state, 28 N / m after heating, and the sizing degree was 42 seconds.

A backing paper was prepared and evaluated in the same manner as in Example 1 except that the amount of N-815 added to the fatty acid amine resin was 1.5% by mass. The basis weight of the formed backing paper was 65 g / m ² , the water elongation was 0.45%, the paper interlayer strength was 10 N / m in the normal state, 44 N / m after heating, and the sizing degree was 45 seconds.

A backing paper was prepared and evaluated in the same manner as in Example 1 except that 8% by mass of the core-sheath fiber was blended without changing the blending ratio of the wood pulp. The basis weight of the printed backing paper was 65 g / m ² , the water elongation was 0.75%, the paper interlayer strength was 20 N / m in the normal state, 30 N / m after heating, and the sizing degree was 40 seconds.

A backing paper was prepared and evaluated in the same manner as in Example 1 except that 30% by mass of the core-sheath fiber was blended without changing the blending ratio of the wood pulp. The basis weight of the formed backing paper was 65 g / m ² , the water elongation was 0.25%, the paper interlayer strength was 10 N / m in the normal state, 35 N / m after heating, and the sizing degree was 47 seconds.

A backing paper was prepared and evaluated in the same manner as in Example 1 except that 30% by mass of the core-sheath fiber was blended without changing the blending ratio of the wood pulp. Narushi and basis weight of the paper backing had a 65 g / ^{m 2,} water elongation of 0.25%, the paper internal bond strength is normal is 10 N / m, the post-heating 35N / m, sizing degree was 47 seconds.

[Comparative Example 1]
A backing paper was prepared and evaluated in the same manner as in Example 1 except that the synthetic fiber and the fatty acid amine resin N-815 were not blended. The results are summarized in the table. The basis weight of the formed backing paper was 65 g / m ² , the water elongation was 2.10%, the paper interlayer strength was 45 N / m in the normal state, 50 N / m after heating, and the sizing degree was 28 seconds.

[Comparative Example 2]
A backing paper was prepared and evaluated in the same manner as in Example 1 except that N-815 of a fatty acid amine resin was not blended. The basis weight of the formed backing paper was 65 g / m ² , the water elongation was 0.55%, the paper interlayer strength was 32 N / m in the normal state, 65 N / m after heating, and the sizing degree was 25 seconds.

[Comparative Example 3]
A backing paper was prepared and evaluated in the same manner as in Example 1 except that the core-sheath fiber was not blended, NBKP was 65% by mass, and LBKP was 35% by mass. The basis weight of the formed backing paper was 65 g / m ² , the water elongation was 2.50%, the paper interlayer strength was 32 N / m in the normal state, 65 N / m after heating, and the sizing degree was 25 seconds.

[Comparative Example 4]
A backing paper was prepared and evaluated in the same manner as in Example 1 except that the addition amount N-815 of the fatty acid amine-based resin was changed to pentaerythritol fatty acid ester (trade name: KB115, manufactured by Kao Corporation). It was. The basis weight of the formed backing paper was 65 g / m ² , the water elongation was 0.50%, the paper interlayer strength was 16 N / m in the normal state, 30 N / m after heating, and the sizing degree was 5 seconds.

[Comparative Example 5]
A backing paper was prepared and evaluated in the same manner as in Example 1 except that the amount of the core-sheath fiber was 50%, the amount of NBKP was 33% by mass, and the amount of LBKP was 17% by mass. . The basis weight of the formed backing paper was 65 g / m ² , the water elongation was 0.20%, the paper interlayer strength was 12 N / m in the normal state, 80 N / m after heating, and the sizing degree was 50 seconds.

NBKP (CSF 500 ml) 20 mass%, LBKP (CSF 500 ml) 30 mass%, thermomechanical pulp (CSF 250 ml) 20 mass%, polyethylene resin-based branched synthetic fiber SWP (trade name: E-400, manufactured by Mitsui Chemicals, Inc.) ) With 30% by mass of pulp, and further with 0.6% by mass of fatty acid amide resin (trade name: PT-205, manufactured by Seiko PMC Co., Ltd.). Paper was prepared and evaluated. The basis weight of the formed backing paper was 65 g / m ² , the water elongation was 0.78%, the paper interlayer strength was 16 N / m in the normal state, 32 N / m after heating, and the sizing degree was 40 seconds.

[Comparative Example 6]
A backing paper was prepared in the same manner as in Example 1 except that no synthetic fiber was used, NBKP was used in an amount of 29 mass%, LBKP was used in an amount of 42 mass%, and TMP was used in an amount of 29 mass%. And evaluated. The basis weight of the formed backing paper was 65 g / m ² , the water elongation was 2.30%, the paper interlayer strength was 48 N / m in the normal state, 50 N / m after heating, and the sizing degree was 35 seconds.

[Comparative Example 7]
A backing paper was prepared and evaluated in the same manner as in Example 1 except that no fatty acid amide resin (trade name: PT-205, manufactured by Seiko PMC Co., Ltd.) was added. The basis weight of the printed backing paper was 65 g / m ² , the water elongation was 0.76%, the paper interlayer strength was 22 N / m in the normal state, 60 N / m after heating, and the sizing degree was 45 seconds.

[Comparative Example 8]
Except that the synthetic fiber SWP E-400 was not blended, the blending amount of NBKP was 29 mass%, the blending amount of LBKP was 42 mass%, and the blending amount of TMP was 29 mass%, the same as in Example 1. A backing paper was prepared and evaluated. The basis weight of the formed backing paper was 65 g / m ² , the water elongation was 2.10%, the paper interlayer strength was 25 N / m in the normal state, 30 N / m after heating, and the sizing degree was 45 seconds.

  As shown in Table 1, the backing papers of Examples 1 to 7 containing a synthetic fiber and a fatty acid amine-based resin were good without curling and opening during construction. In addition, the peelability was also light and uniform between the paper layers, which was a good result. On the other hand, the backing papers of Comparative Examples 1 to 5 containing no synthetic fiber and fatty acid amine-based resin were unable to achieve both curling and opening prevention and peelability.

Since the wallpaper obtained by providing a decorative layer such as a vinyl layer, an olefin layer, a fabric layer, a paper layer, an inorganic layer on the upper layer of the backing paper of the present invention can be affixed to the wall for a long time, It is worth using for the beautiful interior in residences, hotels, hospitals, etc.

Claims (5)

  A wallpaper backing paper for providing a decorative layer on one side as a wallpaper, wherein the backing paper has a thermoplastic synthetic fiber content of 5 to 40 mass% in the total fiber content, and a fatty acid amine resin And / or a wallpaper backing paper characterized by containing a fatty acid amide resin.   The backing paper for wallpaper according to claim 1, wherein the sizing degree is 10 seconds or more, and the strength between paper layers after heating is 20 to 40 N / m.   The backing paper for wallpaper according to claim 1 or 2, wherein a coating liquid containing a water-soluble resin binder and / or a water-dispersible resin binder is applied on at least one side. Basis weight of 40 g / ^{m 2} or more 120 g / ^{m 2} or less, wallpaper backing paper according to any of claims 1 to 3. A wallpaper comprising a decorative layer on the surface of the backing paper for wallpaper according to any one of claims 1 to 4.