JP2002180399A - Backing paper sheet for wallpaper sheet and the wallpaper sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a backing paper sheet for a wallpaper sheet, having high opacity and high whiteness even though an inorganic powder is added thereto in an amount less than ever, and to prepare the wallpaper sheet by forming a decorative surface layer on the backing paper sheet so that the wallpaper sheet has a high masking effect and is highly designable. SOLUTION: This backing paper sheet for the wallpaper sheet comprises a composite inorganic powder of calcium carbonate having surfaces on which titanium oxide is supported and an organic fiber or an inorganic fiber. The wallpaper is prepared by forming the decorative surface layer on the backing paper sheet. The production of the backing paper sheet is conducted by almost uniformly dispersing the powder in the organic fiber or in the inorganic fiber, or coating the paper with the composite inorganic powder after the paper is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backing paper for wallpaper (cloth) and a wallpaper having a decorative layer formed on the surface thereof, and more particularly to a backing paper for wallpaper having high opacity without lowering whiteness. And a wallpaper which can be made to have high concealing property and excellent design by using this backing paper.

[0002]

2. Description of the Related Art Inorganic paper and flame-retardant paper are widely used as wall covering materials, and they are used particularly as backing paper for wallpaper. The term inorganic paper as used herein refers to a paper in which aluminum hydroxide is contained at a high content of about 60 to 80% by weight. Demonstrate high flame retardant effect.

[0003] In addition, inorganic paper has the feature that the opacity and whiteness are high due to the large amount of aluminum hydroxide in the paper. The aluminum content is extremely high, resulting in high cost and limited use for special applications,
Typically, it will be used in places where fire protection standards are strict.

[0004] On the other hand, as for flame-retardant paper, only those obtained by adding inorganic powders such as aluminum hydroxide, talc, kaolin and titanium dioxide to cellulose pulp by a wet papermaking method and cellulose pulp are difficult to obtain. The thing which applied or impregnated the fuel is known. The content of the inorganic powder such as aluminum hydroxide and talc in the flame retardant paper is extremely low as compared with the inorganic paper, and is usually less than 10% by weight.

[0005] These flame-retardant papers are made of groundwood pulp (GP) or thermomechanical pulp (TM) as cellulose pulp.
P) or pulp that is not completely exposed,
Alternatively, many papers have a yellow tint due to the addition of a coloring pigment or dye in the papermaking process, or the application or impregnation of a flame retardant, and cannot be said to be a backing paper with high whiteness.

[0006] As the flame retardant to be impregnated in the flame retardant paper, methylolated guanidine sulfamate is generally used in order to maintain heat resistance and paper strength. However, most of the methylolated guanidine sulfamate contains formalin, which has been a difficult problem since it was pointed out that workers at papermaking sites could be harmful to health and environmental pollution in the room after wallpaper construction, especially sick house syndrome. Backing papers not impregnated with flame retardants have also appeared on the market.

[0007] The newly introduced backing paper not impregnated with a flame retardant has a lower rice basis weight and lower opacity as compared with a conventional flame retardant paper containing an inorganic powder. In particular, if the basis weight of rice is reduced to reduce costs, the effect is large and naturally causes a reduction in opacity. At the same time, flame-retardant paper is losing its price competitiveness compared to the backing paper not newly impregnated with flame retardants. The cost is also reduced due to the reduction.

However, when a wallpaper using a low opacity backing paper, that is, a cloth is applied to a wall surface,
The wallpaper is not preferable as a wall covering material because the color or pattern of the groundwork at the place where the construction is performed is reflected on the surface of the wallpaper and impairs the texture of the wallpaper. In order to compensate for the lowered opacity of the backing paper, it is conceivable to improve the opacity of the decorative layer, but this increases the cost of the wallpaper product.

[0009] The opacity can be reduced by adding pigments and dyes to the papermaking process of the backing paper and coloring it. However, the whiteness of the backing paper decreases, and as a result, the decorative layer becomes white. Is not suitable as a wallpaper product because the non-white color of the backing paper is transparent. In particular, the majority of wallpapers are based on white, and even if the wallpaper is not white, when applying a color or pattern to the decorative layer, the color and pattern of the decorative layer can be freely drawn by using a white base . That is, it is preferable that both the opacity and whiteness required of the backing paper are high.

In order to reduce the cost by reducing the basis weight of the above-mentioned backing paper and not to reduce the paper strength and operability,
Generally, an inorganic powder having high opacity is required. In order to impart a high degree of opacity to paper, generally, titanium dioxide having a high refractive index is provided by filling or coating the paper with titanium dioxide. However, since titanium dioxide is expensive, it goes against cost reduction.

Titanium dioxide is mainly used as fillers and pigments for papermaking. Particles having a particle size of 0.1 to 0.5 μm are used. , Due to the effect of the type and concentration of the paper strength agent, etc., it has the property of easily agglomerating, so the distribution of titanium dioxide particles in the paper becomes uneven, and the properties of titanium dioxide can be fully exhibited. Absent.

Japanese Unexamined Patent Publication No. 3-199500 proposes a flame retardant paper for improving the opacity of the backing paper for wallpaper coated or impregnated with the flame retardant described above. Is about 30 pieces of mechanical pulp.
% Inevitably lowers whiteness. In order to solve this problem, a backing paper for wallpaper which has been considered to achieve both opacity and whiteness has already been proposed.

Japanese Patent Application Laid-Open No. 4-50400 discloses a backing paper for wallpaper. The backing paper is obtained by mixing two or more types of aluminum hydroxide having different particle diameters with bleached softwood kraft pulp by a wet papermaking method. It is manufactured by a method in which aluminum hydroxide is contained in an amount of 40% by weight or more and 60% by weight or less in the total weight of paper. However, according to this method, although it is possible to provide a certain degree of opacity, it is difficult to meet the demand for higher opacity. That is, the aluminum hydroxide content is reduced from 40% by weight to 60% by weight.
Increasing the opacity only increases by 1%.

[0014]

As described above, in the backing paper for wallpaper, it is necessary to ensure high opacity and whiteness and promote cost reduction.
To that end, the issue is how to reduce the rice basis weight of the backing paper. To solve this problem, of course, it is sufficient to increase the amount of the inorganic powder in the paper. However, if the amount of the inorganic powder is increased, the paper strength is reduced, the formation is poor due to rapid dehydration, and the filler is dropped. Increases the number of pinholes in the paper web.

The present invention provides a wallpaper backing paper which solves these problems and a wallpaper using the same. In other words, the inorganic properties of the paper are not impaired (that is, the strength of the paper is not reduced, the formation failure due to rapid dehydration, the pinholes in the paper are not increased due to the dropout of the filler, etc.), and the inorganic properties are reduced. It is an object of the present invention to provide a backing paper having a high opacity and high whiteness in a powder amount, and a highly designable wallpaper having a high concealing property formed by forming a decorative layer on the backing paper. .

[0016]

[Means for Solving the Problems] The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, the backing paper for wallpaper and the wallpaper of the present invention have been successfully developed. Among them, the backing paper for wallpaper is characterized by containing a composite inorganic powder carrying titanium dioxide on the surface of calcium carbonate and organic or inorganic fibers, and the wallpaper is
A decorative layer is formed on the backing paper.

In the backing paper of the present invention, the backing paper has high opacity and high whiteness with a small amount of inorganic powder by incorporating a composite inorganic powder carrying titanium dioxide on the surface of calcium carbonate. It does not impair the characteristics inherent in the paper and expresses the strength. That is, a decrease in paper strength, poor formation due to rapid dehydration, an increase in pinholes in the paper web due to dropout of the filler, and the like do not occur. Also, wallpaper having a decorative layer formed on its surface is less affected by an underlayer or backing paper on the decorative layer surface, and can have high design properties.

Further, the form in which the composite inorganic powder is contained in the backing paper of the present invention is not limited to the case where the inorganic or organic fibers are substantially uniformly dispersed throughout the fiber, that is, not only the case where the inorganic or organic fibers are filled, but also the surface of the paper made fiber. Even when the composite inorganic powder is applied (applied) on the top, high opacity and high whiteness can be exhibited in the same manner as in the case where the compounded inorganic powder is contained therein.
The wallpaper produced using the backing paper obtained in this manner has little influence of the underlayer or backing paper on the surface of the decorative layer, and can have high design properties.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The composite inorganic powder having titanium dioxide supported on the surface of calcium carbonate used in the present invention is one in which titanium dioxide is fixed on the surface of calcium carbonate. For example, Japanese Patent Application Hei 2000
There is a titanium dioxide-calcium carbonate composite particle in which titanium dioxide is directly supported on the surface of calcium carbonate proposed in JP-A-202813.

The proposed method for producing titanium dioxide-calcium carbonate composite particles is that titanium dioxide is added directly to the surface of calcium carbonate by adding titanium dioxide particles during the carbonation reaction in the process of producing synthetic calcium carbonate. The titanium dioxide-calcium carbonate composite particles to be supported and obtained by this method can be suitably used in the present invention.

In the present invention, the weight of titanium dioxide supported on the surface of calcium carbonate is desirably at least 0.1 part by weight, preferably at most 0.1 part by weight, based on 100 parts by weight of calcium carbonate. If so, the opacity improving effect of titanium dioxide is hardly exhibited. The form of titanium dioxide to be carried is not particularly limited, and industrially produced rutile-type titanium dioxide and anatase-type titanium dioxide can be used. The particle size of titanium dioxide is excellent in scattering and absorbing light.
1 to 0.5 μm is desirable.

With respect to calcium carbonate carrying titanium dioxide, the smaller the particle size, that is, the same particle size as titanium dioxide is desirable in terms of scattering and absorption of light. If the particle size is too small, the yield rate of the powder decreases, and wastewater is contaminated due to waste of calcium carbonate and an increase in the concentration of suspended solids in the wastewater.

In particular, if the calcium carbonate powder having an average particle size of 25 μm contains 5% by weight or more of calcium carbonate having a particle size of 45 μm or more, the smoothness of the surface of the backing paper becomes remarkable. As a result, the decorative property of the decorative layer formed on the surface is also lowered, so that the design of the wallpaper is not satisfactory. For this reason, the average particle size of calcium carbonate is desirably in the range of 0.5 to 20 μm.

The organic fibers used in the present invention include cellulose fibers, polyvinyl alcohol fibers, polyester fibers, polyethylene fibers and the like, and one or more of these can be used. As the cellulose fiber, for example, softwood kraft pulp (NK
P), hardwood kraft pulp (LKP), softwood sulphite pulp (NSP), hardwood sulphite pulp (LSP), thermomechanical pulp (TMP), groundwood pulp (GP) and other wood pulp. Pulp in which seeds are appropriately selected, pulp in which two or more types are appropriately selected and mixed, or linter pulp can be used.

Polyvinyl alcohol fibers and polyethylene fibers have the property that they are melted by heat and are easily adhered to each other and other compounds. This has the effect of enhancing the water resistance and paper strength of the backing paper. is there. Polyester fiber is excellent in dimensional stability due to water, so by blending polyester fiber, it is possible to reduce elongation and shrinkage when glue is applied to the backing paper of the present invention and the wallpaper using it, and thereafter. it can.

Examples of the inorganic fiber include glass fiber, rock wool fiber, alumina fiber, silica fiber, and the like. Dimensional change and rigidity of the sheet can be obtained. In particular, glass fibers and rock wool fibers can reduce the dimensional change when wet as the backing paper and provide the sheet with rigidity at a reasonable price to ensure the performance as the backing paper for wallpaper.

In the present invention, besides the composite inorganic powder having titanium dioxide supported on the surface of calcium carbonate, other inorganic powders can be used, including aluminum hydroxide, calcium carbonate, talc, kaolin, Clay, silica, etc., which have an average particle size of 0.5 to 20 μm.
Thus, it can be used within a range that does not hinder the manufacturing process, and is not particularly limited.

In the present invention, the backing paper contains the composite inorganic powder in a form in which it is almost uniformly dispersed throughout the inorganic or organic fiber, that is, in a case where the backing paper is filled.
These include the case where the composite inorganic powder is applied to the paper-made surface of the fibers, and the former backing paper is a mixed slurry containing an organic or inorganic fiber raw material and the composite inorganic powder, and a retention aid. And binders are appropriately selected and added,
It can be produced by making a paper by an ordinary wet papermaking method.
The paper machine used at that time may be any of a circular net, a short net, a long net, a birch former, a rotoformer, a hydroformer, etc.The dryer used for drying the paper after the papermaking is a Yankee type, a multi-cylinder. Type or through type.

It is preferable to use a retention aid in the papermaking, which includes a cationic polymer, such as a cationized starch, a cationic polyacrylamide, a polyethyleneimine, a polyamide polyamine. Examples include epichlorohydrin, cation-modified guar gum, cation-modified polyvinyl alcohol, and other cationic polymers, which can be used without any particular limitation.

Also, anionic polymers can be used in the same manner, and examples thereof include polyacrylamide, polymethacrylamide, oxidized starch, and other anionic polymers. It can be used as an agent. Further, in order to maintain the strength of the base paper, an adhesive such as a soluble polyvinyl alcohol or a latex emulsion may be used.

In the backing paper for wallpaper in the present invention, an internal and / or external sizing agent is added during papermaking of the backing paper in order to prevent the paste from penetrating into the base paper at the time of wallpaper application. Is preferred. As the sizing agent, there are internal and / or external sizing agents such as alkyl ketene dimer, acrylic type, alkenyl succinic anhydride, and styrene type, and these can be appropriately selected and used.

In the present invention, the backing paper manufactured as described above may be coated or impregnated on one or both sides with a polymer resin. The purpose is to increase the paper strength of the backing paper, prevent the inorganic powder contained in the backing paper from falling off, and improve the workability with the decorative layer. Examples of the polymer resin used for this purpose include starch, PVA, styrene-butadiene latex, styrene-acryl emulsion, vinyl chloride-acryl emulsion, and polyacryl emulsion.

In the present invention, the polymer resin is used for purposes other than those described above, and the purpose is to impart flame retardancy to the backing paper. Examples of the polymer resin used for this purpose include guanidine sulfamate, guanidine phosphate, guanidine sulfamate, ammonium sulfamate, a condensed phosphate alkyl ester derivative, and ammonium phosphate.

One or more of these polymer resins may be appropriately selected and used in combination with a thickener. The method of applying or impregnating the polymer resin is not particularly limited, but they may be used, for example, by using a commonly used apparatus such as a size press coater, a roll coater, a blade coater, a bar coater, an air knife coater, etc. on-machine or off-machine. It may be applied or impregnated by using.

The amount of the polymer resin to be applied or impregnated is optimally ² to 10 g / m ² . The reason is 2g /
m ² following be coated or impregnated with an amount difficult to secure the strength and surface strength of the paper backing is because it comes to coating or impregnating a 10 g / m ² or more quantities and uneconomical.

In the present invention, the composite inorganic powder is added to the polymer resin in addition to or in place of the above-described filling to form a coating agent, and the coating agent is used to form a coating on one or both surfaces. Pigment may be applied. The purpose of the pigment application at this time is to improve the opacity and whiteness, and to improve the surface smoothness of the backing paper and finish the overall backing paper.

As described above, when the composite inorganic powder is pigment-coated, the composite inorganic powder is used in addition to or in place of the above-described filling, so that the composite inorganic powder is used as a fiber during papermaking. It is not necessary to disperse the composite inorganic powder in the pigment, in which case the composite inorganic powder in the pigment contributes to the improvement in opacity and whiteness in place of the composite inorganic powder dispersed in the fiber. The composite inorganic powder may, of course, use both the filling and the pigment application.

As for the polymer resin contained in the pigment coating agent, when it is not used in combination with the composite inorganic powder,
That is, the same material as used alone or impregnated is used for the same purpose as when used alone. Also for the purpose of imparting the flame retardancy of the backing paper, the same thing as the case where the composite inorganic powder is not used together can of course be used. These polymer resins can be appropriately selected from one or more of them, mixed with the composite inorganic powder, and used as a coating agent. Further, a thickener may be mixed and used in this coating agent.

The method of applying the coating agent is not particularly limited, and various types can be used, and a method in which the above-mentioned composite inorganic powder is not used in combination can be appropriately used. In addition, in the case where the composite inorganic powder and the polymer resin are blended in the pigment coating composition, the polymer resin is used for bonding the composite inorganic powder to the backing paper surface in addition to the various functions when used alone. It also has a function as an agent.

The mixing ratio of the polymer resin and the composite inorganic powder contained in the pigment coating composition is not particularly limited, but the polymer resin is in the range of 50 to 200 parts by weight based on 100 parts by weight of the composite inorganic powder. It is desirable that If the amount of the composite inorganic powder is too large, the amount of the polymer resin that adheres between the powders decreases, and the composite inorganic powder may spill from the surface of the backing paper. Conversely, if the amount of the polymer resin is too large, the polymer resin is generally more expensive than the composite inorganic powder or the like, and is therefore uneconomical.

The coating amount of the pigment coating agent is desirably in the range of ² to 30 g / m ^{2 in} total in consideration of performance and cost. If the total coating amount is 2 g / m ² or less, not only the effect of improving the opacity of the composite inorganic powder is not exhibited, but also there is a problem in manufacturing that it is difficult to apply the powder uniformly to paper. On the other hand, even if it is applied in an amount of 30 g / m ² or more, the improvement in opacity reaches a plateau, and above all, the amount of the coating agent to be used increases, which is not economical. In addition, in the coating material, a liquid such as water is used in addition to the polymer resin and the composite inorganic powder of the active ingredient to make the liquid, and the coating amount is the amount in the liquid coating material. It refers to the amount of solid components such as composite inorganic powder and polymer resin excluding liquid components.

In the present invention, when a decorative layer is formed on the above-mentioned backing paper to make a wallpaper, it is possible to obtain a wallpaper product in which the background color and pattern are not reflected on the surface of the decorative layer. Materials for the decorative layer include polyvinyl chloride, (polyvinylidene chloride), polyolefin (polyethylene, polypropylene, acrylic, styrene, acryl-styrene, ethylene vinyl acetate), paper, and the like. Can be composed of at least one of them. As a method of bonding the decorative layer to the backing paper, there is a method of thermocompression bonding the decorative layer and the backing paper or bonding the decorative layer and the backing paper with an adhesive or wet lamination.

[0043]

EXAMPLES Examples of the present invention and comparative examples will be described below, but the present invention is not limited by these examples. Example 1 Pulp obtained by beating organic fibers containing 30% by weight of thermomechanical pulp (TMP), 30% by weight of softwood kraft pulp (NKP) and 40% by weight of hardwood bleached kraft pulp (LBKP) to a freeness of 350 mlcsf by a conventional method. 98 parts by weight, major axis 1.5 μ, minor axis 0.
0.25 μm on the surface of 3 μm spindle-shaped synthetic calcium carbonate
m rutile-type titanium dioxide is mixed with 2.0 parts by weight of a composite inorganic powder in which 25 parts by weight of spindle-shaped synthetic calcium carbonate is supported in an amount of 100 parts by weight to form an aqueous suspension.

In the aqueous suspension, a polyamidoamine epichlorohydrin (trade name: Epinox, manufactured by Nippon PMC), which is a cationic polymer compound, is used as a retention aid for improving yield.
0.1 part by weight was added, and 0.3 parts by weight of an alkyl ketene dimer-based sizing agent (manufactured by Arakawa Chemical) as a sizing agent and 0.01 part by weight of Percoll 173 (manufactured by Allied Colloid) as an anionic retention aid were mixed. Paper was made using a hand-made square sheet machine for testing. The sheet thus formed was dried using a drum dryer set at 120 to 130 ° C. to obtain a sheet having a basis weight of 91.4 g / m ² .

Next, a dispersion liquid in which starch powder (Oji Ace A, manufactured by Oji Constarch) as a polymer resin was dispersed in water was heated to about 80 ° C. for about 1 hour to dissolve the dispersion.
It was prepared so as to have a solution having a solid content of 10%. The starch solution was impregnated with 3.7 g / m ^{2 of} polymer resin from both sides of the backing paper using a laboratory size press,
It dried using the drum type dryer set to 120-130 degreeC, and obtained the backing paper for wallpapers in which the composite inorganic powder with a basis weight of 95.1 g / m < ² > was loaded.

Example 2 Same Organic Fiber as in Example 1
0 parts by weight, 3.0 parts by weight of the composite inorganic powder, and aluminum hydroxide (trade name: H-31 having an average particle size of 8) as the inorganic powder.
μm, manufactured by Showa Denko KK) and mixed with 6.0 parts by weight to form an aqueous suspension.
m ² sheets were obtained. Next, the same starch solution as in Example 1 was impregnated and dried to obtain a backing paper for wallpaper having a basis weight of 82.3 g / m ² .

Example 3 Organic Fibers Same as in Example 1
0 parts by weight and 4.0 parts by weight of the same inorganic powder as in Example 2 were mixed to form a water suspension, and a sheet having a basis weight of 80.1 g / m ^{2 was} prepared in the same manner as in Example 1 except for this. Obtained. Then, 50 parts by weight of the same inorganic powder as in Example 2, 100 parts by weight of the same composite inorganic powder as in Example 1, and 10 parts by weight of starch solution were added to a starch solution having a solid concentration of 10% prepared in the same manner as in Example 1.
0 parts by weight (in terms of solid content) were mixed to prepare a pigment coating composition. The pigment coating composition prepared as described above was applied to the surface of the sheet with an applicator bar and dried to obtain a backing paper for wallpaper coated with a composite inorganic powder having a basis weight of 82.5 g / m ² .

Example 4 Same Organic Fiber as in Example 1
0 parts by weight and 3.0 parts by weight of the same inorganic powder as in Example 2 were used.
g / m ² were obtained. Next, the same pigment coating composition as in Example 3 was applied to both sides of the sheet and dried to obtain a paper backing paper having a basis weight of 65.5 g / m ² .

Example 5 Softwood bleached kraft pulp (NBKP) was disintegrated as organic fibers, and then 17.0 parts by weight of a pulp mainly composed of cellulose fibers whose freeness was beaten to 350 mlcsf by a conventional method, polyvinyl alcohol, Fiber (Product name: VPB-101, made by Kuraray)
1.0 parts by weight, glass fiber (diameter 6μ) as inorganic fiber
m, fiber length 3 mm, Nippon Electric Glass) 2.0 parts by weight and 80.0 parts by weight of the same composite inorganic powder as in Example 1 were mixed to form an aqueous suspension, and otherwise the same as in Example 1 Thus, a sheet having a basis weight of 147.5 g / m ² was obtained. Then, Example 1
Impregnated with the same starch solution as above, dried and weighed 151.0 g
/ M ² for wallpaper backing paper.

Example 6 Same organic fiber as in Example 5
0 parts by weight, 1.0 part by weight of polyvinyl alcohol, 2.0 parts by weight of glass fiber, and the same inorganic powder as in Example 2.
0 parts by weight to form an aqueous suspension, 126.0 g / m ²
Sheet was obtained. Next, the same pigment coating composition as in Example 3 was applied to one surface of the above sheet, dried, and weighed 15%.
A 5.3 g / m ² backing paper for wallpaper was obtained.

Comparative Example 1 The same organic fiber 100 as in Example 1
Parts by weight were mixed to form a water suspension to obtain a sheet of 92.9 g / m ² . Next, the same starch solution as in Example 1 was impregnated and dried to obtain a backing paper for wallpaper having a basis weight of 96.2 g / m ² .

Comparative Example 2 Same organic fiber as in Example 1.
0 parts by weight and 6.0 parts by weight of the same inorganic powder as in Example 2 were mixed to form a water suspension, and a sheet having a basis weight of 84.7 g / m ^{2 was} prepared in the same manner as in Example 1 except for this. Obtained. Next, the same starch solution as in Example 1 was impregnated and dried, and the basis weight was 88.3.
g / m ² of wallpaper backing paper was obtained.

For each of the backing papers for wallpaper obtained in the above Examples and Comparative Examples, the compounding amounts of the composite inorganic powder and the inorganic powder contained in the absolutely dried paper were determined by X-ray fluorescence. The results are shown in Table 1. Similarly, opacity and whiteness were measured. The opacity at that time is JIS-P-813
8 and the whiteness was measured according to the Hunter whiteness test method for paper and pulp according to JIS-P-8123. The results are also shown in Table 1.

[0054]

[Table 1]

[Evaluation] According to the results shown in Table 1, the backing paper for wallpaper of the present invention contained at least 1.2% by weight of the composite inorganic powder.
It can be seen that the opacity and whiteness are improved by the inclusion. That is, it was confirmed that opacity and whiteness were improved by filling or pigment-coating a predetermined amount of the composite inorganic powder. In addition, the compounding amount of the composite inorganic powder in Table 1 is the total amount of the filling amount and the coating amount.

With respect to the backing paper for wallpaper of each of the examples and comparative examples obtained above, a prototype wallpaper having a decorative layer formed thereon was manufactured, and the effect of the color of the backing paper on the decorative layer was investigated. The decorative layer was formed as follows. That is, a vinyl chloride paste sol having the following composition was applied to a paper backing paper of each of Examples and Comparative Examples to a thickness of 120 μm by a doctor blade coater, and then the paste was semi-gelled through a heating furnace at 160 ° C. A prototype wallpaper having a decorative layer formed by foaming about twice in a heating furnace at 220 ° C. is obtained. The vinyl chloride paste sol was prepared by mixing a composition having the following composition with a mineral spirit having a viscosity of 8%.
It was prepared by adjusting to 000 centipoise (25 ° C.).

Composition of vinyl chloride paste sol Vinyl chloride paste resin 100 parts by weight DOP (plasticizer) 50 parts by weight TCEP (flame retardant plasticizer) 10 parts by weight Ba-Zn (stabilizer) 3 parts by weight ADCA (foaming agent) 3 Parts by weight Calcium carbonate (filler) 50 parts by weight Sb ₂ O ₃ (flame retardant) 3 parts by weight Titanium oxide (pigment) 20 parts by weight

[Evaluation Method and Criteria]
Non-combustible gypsum board (JIS A6901, certified by the Minister of Construction N)
o1027) A prototype wallpaper was affixed as a base material, and it was visually evaluated whether the base color was reflected on the wallpaper surface and whether the color of the decorative layer had stagnation according to the following criteria. ：: The color of the base is not reflected on the surface at all. And there is no stagnation in the color of the decorative layer. ：: The base color is not reflected on the surface. In addition, there is little stagnation in the color of the decorative layer. ×: The base color is reflected on the surface. In addition, the color of the decorative layer has stagnation.

Table 2 shows the evaluation results. In addition, wallpaper examples 1 to 6 in this table are wallpaper in which the decorative layer having the above composition was formed on each of the backing papers of examples 1 to 6.
Wallpaper comparative examples 1 and 2 are the same as above. According to the results in Table 2, the prototype wallpaper obtained by applying the decorative layer to the wallpaper backing paper of the present invention contained at least 1.2% by weight of the composite inorganic powder.
It can be seen that the color of the underlayer is not reflected on the surface and the color of the decorative layer has little stagnation by the filling or pigment application.

[0060]

[Table 2]

[0061]

The backing paper for wallpaper of the present invention contains a composite inorganic powder in which titanium dioxide is supported on calcium carbonate in the form of being filled or coated, so that titanium dioxide is particularly agglomerated in a papermaking system. And the whiteness can be exhibited without reducing the high refractive index of titanium dioxide, and as a result, high whiteness and high opacity can be secured on the backing paper for wallpaper. Was. Further, it was also found that the wallpaper using the backing paper of the present invention did not show the color of the base on the surface, and the color of the decorative layer had no stagnation. From these, the present invention,
It is also possible to solve the problem of the decrease in opacity due to the decrease in the basis weight of the backing paper for wallpaper and the decrease in whiteness which is caused by the addition of a coloring component used to compensate for this.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsuyuki Tanabe, Inventor Katsuyuki 8-1, Hirai-machi, Nishitama-gun, Tokyo, Japan Inside the Iron Mining Co., Ltd. work Co., Ltd. in the F-term (reference) 4F100 AA08A AA08D AA08E AA21A AA21D AA21E AC10A AG00A AJ04A AJ07 AK01B AK01C AK01D AK01E AK03E AK04A AK15E AK21A AK41A BA02 BA03 BA04 BA05 BA06 BA07 DE01A DE01D DE01E DG01A DG10E EH46B EH46C EH46D EH46E EH462 GB08 HB00 HB00E JN02 YY00A YY00B YY00C YY00D YY00E 4L055 AA02 AA03 AC03 AC06 AF04 AF09 AF16 AF21 AF33 AG10 AG15 AG40 AG47 AG77 AG96 AH11 BE08 EA05 EA14 EA16 EA32 FA12 GA22

Claims (13)

[Claims] 1. A paper backing paper comprising a composite inorganic powder having titanium dioxide supported on the surface of calcium carbonate and organic fibers or inorganic fibers. 2. The calcium carbonate has an average particle size of 0.5 to 0.5.
2. The backing paper for wallpaper according to claim 1, wherein the average particle diameter of the titanium dioxide supported on the backing paper is 0.1 to 0.5 [mu] m. 3. The composite inorganic powder wherein titanium dioxide is directly supported on the surface of calcium carbonate by adding titanium dioxide particles in the carbonation step.
Or the backing paper for wallpaper according to 2. 4. The backing paper for wallpaper according to claim 1, wherein the content of the composite inorganic powder is 1 to 80% by weight. 5. The backing paper for wallpaper according to claim 1, wherein the organic fiber contains at least one kind of cellulose fiber, polyvinyl alcohol fiber, polyester fiber, and polyethylene fiber. 6. An inorganic fiber containing at least one of glass fiber and rock wool.
Backing paper for wallpaper according to any one of the above. 7. The backing paper for wallpaper according to claim 1, wherein a polymer resin is applied or impregnated on one or both sides. 8. The amount of the polymer resin to be applied or impregnated is 2 to 8.
Wallpaper backing paper according to claim 7, which is a 10 g / m ^2. 9. The backing paper for wallpaper according to claim 1, wherein a coating agent containing a composite inorganic powder and a polymer resin is applied to one or both surfaces. 10. The wallpaper backing according to claim 9, wherein the ratio of the composite inorganic powder to the polymer resin in the coating agent is 50 to 200 parts by weight of the polymer resin per 100 parts by weight of the composite inorganic powder. paper. 11. The backing paper for wallpaper according to claim 9, wherein the total coating amount of the coating agent containing the composite inorganic powder and the polymer resin is ² to 30 g / m ² in solid content. 12. A wallpaper having a decorative layer formed on the backing paper for wallpaper according to any one of claims 1 to 11. 13. The decorative layer according to claim 1, wherein the decorative layer comprises at least one of polyvinyl chloride, polyolefin and paper.
Wallpaper described in 2.