JP2024038896A - Wallpaper backing paper - Google Patents

Abstract

To provide wallpaper backing paper that does not cause stains on conveyor rolls that occur in a drying process during production, has good peel-up properties after use, has excellent hiding properties, and has wet strength.SOLUTION: The problem can be solved by wallpaper backing paper containing base paper containing at least wood pulp, filler, wet strength agent, dry strength agent and polyethylene wax, and a surface sizing agent imparted to the base paper. The filler contains at least calcined kaolin and the polyethylene wax contains at least polyethylene oxide wax.SELECTED DRAWING: None

Description

The present invention relates to a wallpaper backing paper that is a base material for a wallpaper backing material made of resin.

Wallpaper made from resin such as vinyl chloride resin or olefin resin is produced by applying a resin-containing liquid to the surface of the wallpaper lining paper that serves as the base material and drying it, or applying vinyl chloride to the surface of the wallpaper lining paper. It is formed by laminating synthetic resin layers made of resin or olefin resin. Thereafter, the wallpaper is given a design by embossing or printing, if necessary. To apply wallpaper to walls, apply water-soluble glue such as starch, vinyl acetate emulsion, and methylcellulose to the back side of wallpaper backing paper and/or the wall surface, and then apply wallpaper to walls such as plywood, gypsum board, and concrete. Paste it.

When the glue is applied to the back side of the wallpaper backing paper and/or the glue is applied to the wall and then the wallpaper backing paper is pasted, the moisture contained in the glue is absorbed by the wallpaper backing paper. Moisture may cause the wallpaper backing paper to soften and/or stretch, resulting in a decrease in the wet strength of the wallpaper backing paper. A decrease in wet strength results in damage to the wallpaper and a decrease in the workability of wallpapering.

The wallpaper backing paper also needs to have concealing properties. If the hiding power of the wallpaper lining paper is insufficient, the color or pattern of the wall surface will be reflected on the surface of the wallpaper when the wallpaper is applied to the wall surface. This phenomenon impairs the texture of the wallpaper. Therefore, wallpaper lining paper needs to have practically sufficient hiding power.

In addition, for example, wallpaper as an interior material in Japan has traditionally been applied to walls such as gypsum board using starch-based adhesives in accordance with Japanese Industrial Standard JIS A6922:2010 "Starch-based adhesives for wallpaper construction and fittings". The most common method of construction is to attach it to the wall. When carrying out interior renovations, it is necessary to remove the existing wallpaper. Wallpaper lining paper has a so-called peel-up property, in which the layers peel off when removed to facilitate the peeling process, leaving one half of the layer as a thin layer on the wall surface. If the wallpaper lining paper does not have good peel-up properties, work is required to make the wall surface uniform, which deteriorates work efficiency.

In addition, for wallpaper lining paper, a liquid containing resin is coated and dried on the surface of the wallpaper lining paper, or a synthetic resin layer made of vinyl chloride resin or olefin resin is laminated, so the surface of the formed resin High smoothness is required to prevent unevenness from occurring. However, when attempting to impart high smoothness to wallpaper-backed paper, components of the wallpaper-backed paper may adhere to transport rolls and the like present during the drying process during manufacture, resulting in roll stains.

There are wallpaper lining papers that have excellent peel-up properties, surface fuzz control, dimensional stability, hiding properties, and foaming properties when used for wallpaper. For example, a paper machine equipped with an on-top former with a wire part and a Yankee dryer is used, raw material pulp and filler are used as the main raw materials, and the raw material pulp contains 5 to 65% by mass of mechanical pulp, and the freeness of the raw material pulp is 400cc or more, contains a dry paper strength enhancer, a wet paper strength enhancer, and a sizing agent, the smoothness of the drying surface that is the contact surface to the Yankee dryer according to JIS-P8119 is 30 to 60 seconds, and JAPANTAPPI No. There is a known wallpaper backing paper characterized by an interlaminar strength in the Z-axis direction of 40 to 90 mJ in both the vertical and horizontal directions, as measured by the internal bond tester method specified in 18-2. For example, see Patent Document 1).

JP2018-084011A

In light of the above circumstances, the object of the present invention is to provide a wallpaper that does not cause stains on conveyor rolls that occur during the drying process during manufacturing, has good peel-up properties after use, has excellent hiding properties, and has wet strength. The purpose is to provide a backing paper.

The present inventors have made extensive research to achieve the above object, and as a result, the object of the present invention is achieved as follows.

[1] A base paper containing at least wood pulp, a filler, a wet paper strength agent, a dry paper strength agent, and a polyethylene wax, and a surface sizing agent applied to the base paper, and the filler contains calcined kaolin. A wallpaper backing paper comprising at least said polyethylene wax comprising at least oxidized polyethylene wax.

[2] The wallpaper lining paper according to [1] above, wherein the calcined kaolin is 66% by mass or more and 94% by mass or less based on the entire filler.

[3] The wallpaper lining paper according to [1] or [2] above, wherein the surface sizing agent contains at least starch and styrene-acrylic resin.

According to the present invention, it is possible to provide a wallpaper lining paper that does not cause stains on conveyor rolls that occur during the drying process during manufacturing, has good peel-up properties after use, has excellent hiding properties, and has wet strength. can.

The present invention will be explained in detail below.
The base paper constituting the wallpaper backing paper contains at least wood pulp, filler, wet strength agent, dry strength agent, and polyethylene wax.

The base paper is made of wood pulp, fillers, wet strength agents, dry strength agents and polyethylene wax, and optionally sizing agents, retention aids, fixing agents, binders, drainage aids, cationic resins and polymers. Cationizing agents such as cationic salts, pigment dispersants, thickeners, fluidity improvers, antifoaming agents, foam inhibitors, mold release agents, foaming agents, penetrating agents, colored dyes, colored pigments, ultraviolet absorbers It can be obtained by making a paper stock containing one or more additives selected from the group consisting of additives conventionally known in the paper manufacturing field, such as , antioxidants, preservatives, anti-bite agents, and waterproofing agents.

Paper making is carried out using a conventionally known paper machine by adjusting the paper stock to be acidic, neutral or alkaline. Examples of paper machines include Fourdrinier paper machines, twin wire paper machines, combination paper machines, cylinder paper machines, Yankee paper machines, and the like.

The base paper can be calendered. The calendering process may be performed either before and/or after the size press described later. Calendering is a process that averages smoothness and thickness by passing paper between rolls. Examples of calendering devices include machine calenders, soft nip calenders, super calenders, multi-stage calenders, and multi-nip calenders.

The above-mentioned wood pulp is conventionally known in the paper manufacturing field. Examples of wood pulp include chemical pulps such as LBKP (Leaf Bleached Kraft Pulp) and NBKP (Needle Bleached Kraft Pulp), GP (Groundwood Pulp), PGW (Pressure GroundWood pulp), RMP (Refiner Mechanical Pulp), and TMP (ThermoMechanical Pulp). Mechanical pulp such as Pulp), CTMP (ChemiThermoMechanical Pulp), BCTMP (Bleached ChemiThermoMechanical Pulp), CMP (ChemiMechanical Pulp), CGP (ChemiGroundwood Pulp), waste paper pulp such as DIP (DeInked Pulp), and waste paper generated at paper mills. (Spoilage) can be mentioned. Examples of wood include conifers and hardwoods. The wood pulp is one or more types selected from the group consisting of these.

The above fillers are conventionally known in the papermaking field. Examples of fillers include calcium carbonate, kaolin, clay, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, activated clay, diatomaceous earth, silica, alumina, hydroxide. White inorganic pigments such as aluminum, lithopone, zeolite, magnesium carbonate and magnesium hydroxide, and white organic pigments such as styrene plastic pigments, acrylic plastic pigments, polyethylene plastic pigments, microcapsules, urea resin particles and melamine resin particles. can be mentioned. The filler is one or more kinds selected from the group consisting of these.

The filler includes at least calcined kaolin, which is a type of kaolin. Calcined kaolin can be obtained by various conventionally known production methods. The method for producing the calcined kaolin of the present invention is not limited. Calcined kaolin can be roughly divided into partially calcined kaolin obtained by calcining kaolinite at a temperature of approximately 650°C to 700°C, and fully calcined kaolin obtained by calcining kaolinite at a temperature of 1000°C to 1050°C. It may be. If the wallpaper backing paper does not contain calcined kaolin, the hiding properties, peel-up properties and wet strength will deteriorate.
In some embodiments, the wallpaper lining paper has a filler content of 300 parts by mass or more and 500 parts by mass or less based on 1000 parts by mass of wood pulp in the wallpaper lining paper.
Additionally, in some embodiments, the calcined kaolin is 66% by weight or more and 94% by weight or less based on the total filler in the wallpaper backing paper, including the calcined kaolin. The reason for this is that hiding properties, peel-up properties and wet strength are improved.

The above-mentioned wet paper strength agents are conventionally known in the paper manufacturing field. Examples of wet paper strength agents include melamine resins, urea resins, polyamide resins, urea formaldehyde resins, melamine formaldehyde resins, polyamide epichlorohydrin resins, and polyamide polyamine epichlorohydrin resins. Examples include polyamide epoxy resins having an epoxy group in the resulting molecule.
In some embodiments, the wallpaper-backed paper has a wet strength agent content of 7 parts by weight or more and 27 parts by weight or less based on 1000 parts by weight of the wood pulp in the wallpaper-backed paper. The reason for this is that peel-up properties and wet strength are improved.

In some embodiments, the wet paper strength agent includes at least a polyamide polyamine epihalohydrin resin. Polyamide polyamine epihalohydrin resin is a resin obtained by reacting polyamide polyamine and epihalohydrin. In at least one embodiment, the polyamide polyamine epihalohydrin resin is 50% or more by weight of the total wet strength agent in the wallpaper backing paper, including the polyamide polyamine epihalohydrin resin. The reason for this is that the wet strength is improved.

Examples of the epihalohydrin of the polyamide polyamine epihalohydrin resin include epichlorohydrin and epibromohydrin. From the viewpoint of industrial availability, epichlorohydrin is preferred.
Polyamide polyamine Examples of the polyamide polyamine of the epihalohydrin resin include polycondensates of dicarboxylic acids and polyalkylene polyamines. The dicarboxylic acids are one or more selected from dicarboxylic acids, dicarboxylic esters, and dicarboxylic anhydrides. Dicarboxylic acids include, for example, aliphatic dicarboxylic acids such as malonic acid, succinic acid, glutaric acid and adipic acid, dicarboxylic acids such as aromatic dicarboxylic acids such as phthalic acid, isophthalic acid and terephthalic acid, and sodium or potassium dicarboxylic acids. Examples include salts such as Dicarboxylic acid esters are these esters, and dicarboxylic acid anhydrides are these anhydrides. As the dicarboxylic acids, two or more different dicarboxylic acids can be used in combination. Examples of the polyalkylene polyamines include diethylenetriamine, triethylenetetramine, and tetraethylenepentamine. As the polyalkylene polyamines, two or more different polyalkylene polyamines can be used in combination.

In the above polycondensation reaction, for example, aminocarboxylic acids or diamines can be used in combination. Examples of aminocarboxylic acids include aminocarboxylic acids such as glycine, alanine, and aminocaproic acid, esters thereof, and lactams such as caprolactam. Examples of diamines include ethylenediamine, 1,3-propanediamine, and 1,4-butanediamine. Examples of the polycondensation reaction include a method in which the reaction is carried out at a temperature of about 50° C. or more and 250° C. or less under normal pressure or reduced pressure, and the produced water or alcohol is removed from the system.

The obtained polyamide polyamine is then subjected to reaction with epihalohydrin. The reaction between the polyamide polyamine and epihalohydrin is carried out, for example, in an aqueous solution having a resin concentration of about 10% by mass or more and 70% by mass or less. The reaction between the polyamide polyamine and epihalohydrin is usually carried out at a temperature of 10°C or higher and 80°C or lower.
Polyamide polyamine epihalohydrin resins are commercially available from, for example, Seiko PMC, Taoka Chemical Industries, and Arakawa Chemical Industries.

The above-mentioned dry paper strength agents are conventionally known in the paper manufacturing field. Examples of dry paper strength agents include polyacrylamide resins such as anionic polyacrylamide resins, cationic polyacrylamide resins, and amphoteric polyacrylamide resins, cationized starches, dialdehyde starches, and vegetable gums.
In some embodiments, the wallpaper lining paper has a dry paper strength agent content of 8 parts by mass or more and 18 parts by mass or less based on 1000 parts by mass of wood pulp in the wallpaper lining paper. The reason for this is that it prevents the occurrence of stains on the conveyor rolls that occur during the drying process during manufacturing and improves the wet strength.

In some embodiments, the dry paper strength agent includes at least a polyacrylamide resin. Polyacrylamide resin is a resin obtained by polymerizing acrylamide (CH ₂ =CHCONH ₂ ) as a main monomer. In at least one embodiment, the polyacrylamide resin is 50% by mass or more based on the total dry paper strength agent in the wallpaper backing paper, including the polyacrylamide resin. The reason for this is that stains on the conveyor rolls that are present during the drying process during manufacturing are prevented from occurring and the wet strength is improved.

Polyacrylamide resin is a resin obtained by polymerizing acrylamide (CH ₂ = CHCONH ₂ ) as the main monomer, and is a resin in which acrylamide is homopolymerized or copolymerized with other monomers that can be copolymerized with acrylamide. It is a polymerized resin. Here, the polyacrylamide resin obtained by polymerizing acrylamide as a main monomer is a resin containing 50 mol% or more of acrylamide as a monomer in the molecule.

Other monomers that can be copolymerized with acrylamide include, for example, alkylacrylamides such as N-methylacrylamide, dialkylacrylamides such as N,N-dimethylacrylamide, dialkylaminoalkylacrylamides such as dimethylaminoethyl acrylamide and dimethylaminopropylacrylamide, Hydroxyalkylacrylamides such as N-(hydroxymethyl)acrylamide and N-(2-hydroxyethyl)acrylamide, alkylmethacrylamides such as diacetone acrylamide, methacrylamide, N-methylmethacrylamide, N,N-dimethylmethacrylamide, etc. dialkyl methacrylamide, dialkylaminoalkyl methacrylamide such as dimethylaminoethyl methacrylamide and dimethylaminopropyl methacrylamide; hydroxyalkyl methacrylamide such as N-(hydroxymethyl) methacrylamide and N-(2-hydroxyethyl) methacrylamide; Mention may be made of acetone methacrylamide.
Other monomers that can be copolymerized with acrylamide include, for example, α,β-unsaturated carboxylic acids and their salts, unsaturated carboxylic acid anhydrides, unsaturated carboxylic acid esters, and vinyl cyanide monomers. Examples include olefinic monomers and olefinic monomers.
Examples of the vinyl cyanide monomer include acrylonitrile, methacrylonitrile, 2-hydroxyethyl acrylonitrile, and chloroacrylonitrile. Examples of the α,β-unsaturated carboxylic acid include acrylic acid, methacrylic acid, and itaconic acid. Examples of the unsaturated carboxylic anhydride include maleic anhydride and itaconic anhydride. Examples of the unsaturated carboxylic acid ester include methyl acrylate and methyl methacrylate. Examples of the vinyl monomer include styrene, α-methylstyrene, vinyl chloride, and vinyl acetate. Examples of the olefin monomer include ethylene and propylene.
The other monomer that can be copolymerized with acrylamide is one or more monomers selected from the group consisting of these.

Polyacrylamide resins can be produced by conventionally known polymerization methods such as solution polymerization, suspension polymerization, precipitation polymerization, dispersion polymerization, and emulsion polymerization.
Polyacrylamide resins are commercially available from, for example, Seiko PMC Co., Ltd. and Harima Kasei Co., Ltd.

In some embodiments, the base paper contains a sizing agent. The sizing agents are those conventionally known in the paper manufacturing field. Examples of the sizing agent include rosin, petroleum resin sizing agent, alkyl ketene dimer, alkenyl succinic anhydride, and stearic anhydride. In at least one embodiment, the sizing agent is an alkyl ketene dimer. The reason for this is that the alkyl ketene dimer has a lactone ring in its chemical structure and chemically reacts with cellulose, which has an effect not only on the size properties but also on the strength of the paper.
In some embodiments, the wallpaper lining paper has a sizing agent content of 1 part by weight or more and 5 parts by weight or less based on 1000 parts by weight of the wood pulp in the wallpaper lining paper.

In some embodiments, the base paper contains a retention aid. The retention aids are those conventionally known in the papermaking field. Examples of retention aids include inorganic salts such as aluminum sulfate, polyethyleneimine, polyamide, and polyethylene oxide. In at least one embodiment, the retention agent is aluminum sulfate. The reason for this is that aluminum sulfate has a high coagulation ability due to aluminum ions, which is effective not only in improving the yield but also in increasing the strength of the paper.
In some embodiments, the wallpaper-backed paper has a retention aid content of 1 part by weight or more and 9 parts by weight or less based on 1000 parts by weight of the wood pulp in the wallpaper-backed paper.

The above-mentioned polyethylene wax is a wax that is conventionally known as a lubricant in the paper manufacturing field and contains an ethylene monomer in a polymer. Types of polyethylene wax include, for example, low-density polyethylene wax (polymerization type and decomposition type), medium-density polyethylene wax, high-density polyethylene wax, oxides of the above-mentioned various density polyethylene waxes (oxidized polyethylene wax), and oxides of the above-mentioned various density polyethylene waxes. Examples include modified products (modified polyethylene wax) such as acid-modified products (acid-modified polyethylene wax), and emulsions thereof using emulsifiers. The emulsion includes anionic polyethylene wax, cationic polyethylene wax, and nonionic polyethylene wax depending on the type of emulsifier.

Polyethylene wax can be obtained by conventionally known manufacturing methods, including the following five methods.
(1) A method of polymerizing at high temperature and high pressure using an ethylene radical catalyst,
(2) A method of polymerizing at low pressure using a Ziegler catalyst.
(3) A method of reducing the molecular weight of general molding polyethylene by thermal decomposition.
(4) Low molecular weight polyethylene, which is produced as a by-product when manufacturing polyethylene for general molding, is
A method of separating and purifying and using it.
(5) A method of oxidizing polyethylene for general molding.
In addition, polyethylene waxes are available from, for example, Mitsui Chemicals, Baker Petrolite, Kindai Kagaku Kogyo, Toho Chemical, Meisei Chemical, Shamrock, BYK-Chemie Japan, Keimadditec, Sannopco, and BYK. Commercially available.

The polyethylene wax includes at least oxidized polyethylene wax. Oxidized polyethylene wax is a wax obtained by subjecting polyethylene wax to oxidation treatment to introduce polar groups. Further, oxidized polyethylene waxes include anionic polyethylene waxes using emulsifiers, cationic polyethylene waxes, and nonionic polyethylene waxes. Examples of the oxidation treatment include air oxidation and ozone oxidation. Examples of the polar group include a carboxy group, a hydroxyl group, a formyl group, and an alkoxy group. If the wallpaper lining paper does not contain oxidized polyethylene wax, it will be difficult to prevent stains on conveyor rolls that are present during the drying process during manufacturing, and the peel-up properties will be deteriorated.
In some embodiments, the wallpaper-backed paper has a polyethylene wax content of 0.5 parts by weight or more and 3 parts by weight or less based on 1000 parts by weight of the wood pulp in the wallpaper-backed paper. Also, in at least one embodiment, the oxidized polyethylene wax is 70% by weight or more based on the total polyethylene wax in the wallpaper backing paper, including the oxidized polyethylene wax. The reason for this is that it prevents the occurrence of stains on conveyor rolls that occur during the drying process during manufacturing and improves peel-up properties.

Wallpaper backing paper is made by adding a surface sizing agent to the above-mentioned base paper. The wallpaper backing paper contains a surface size by applying a surface size to the base paper. Examples of surface sizing agents include polyvinyl alcohol and modified products thereof, celluloses such as carboxymethyl cellulose and modified products thereof, acrylamide resin, acrylic resin, styrene acrylic resin, acrylonitrile acetate vinyl acrylate resin, and styrene maleic resin. Examples include acid resins, olefin maleic acid resins, and starches. Starches include various modified starches such as hydroxyethylated starch, oxidized starch, etherified starch, phosphate esterified starch, enzyme-modified starch, and cold water-soluble starch obtained by flash-drying them.
In some embodiments, the content of the surface sizing agent is 1.05 g/m ² or more and 6 g/m ² or less as dry solids per side of the base paper. Further, in some embodiments, the surface sizing agent includes at least starch and styrene acrylic resin. In at least one embodiment, the content of starch as a surface sizing agent is 1 g/m ² or more and 5 g/m ² or less per side of the base paper as dry solid content, and the content of styrene acrylic resin as a surface sizing agent is The dry solid content is 0.05 g/m ² or more and 1 g/m ² or less per side of the base paper. The reason for this is that wet strength is improved.

Starches are conventionally known in the papermaking field. Starches are polysaccharides obtained by polymerizing glucose through glycosidic bonds, and polysaccharides obtained by modifying the hydroxyl groups of glucose with various substituents in polysaccharides obtained by polymerizing glucose through glycosidic bonds. Examples of starches include starch, oxidized starch, enzyme-modified starch, etherified starch, cationic starch, amphoteric starch, dialdehyde starch, esterified starch such as phosphate-esterified starch and urea-phosphate-esterified starch, and hydroxyethylated starch. Examples include starch, hydroxybutylated starch, and the like.

Styrene acrylic resin is a resin obtained by copolymerizing at least a styrene monomer and an acrylic monomer (a monomer having an acryloyl skeleton or a methacryloyl skeleton). Here, the styrene acrylic resin is a resin containing 50 mol% or more of styrene monomers and acrylic monomers in total in the molecule.

Examples of styrenic monomers include alkyl-substituted styrenes such as styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2-ethylstyrene, 3-ethylstyrene, and 4-ethylstyrene. , halogen-substituted styrenes such as 2-chlorostyrene, 3-chlorostyrene, and 4-chlorostyrene, and vinylnaphthalene. The styrenic monomer is one or more selected from the group consisting of these.

Examples of the acrylic monomer include methacrylic acid and its salts, acrylic acid and its salts, methacrylic esters, and acrylic esters.
Examples of methacrylic esters include methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, n-butyl methacrylate, n-pentyl methacrylate, n-hexyl methacrylate, n-heptyl methacrylate, and n-octyl methacrylate. , n-decyl methacrylate, n-dodecyl methacrylate, n-tetradecyl methacrylate, n-hexadecyl methacrylate, n-octadecyl methacrylate, isopropyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, isopentyl methacrylate, methacrylate methacrylic acid alkyl esters such as amyl acid, neopentyl methacrylate, isohexyl methacrylate, isoheptyl methacrylate, isooctyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate and t-butylcyclohexyl methacrylate, phenyl methacrylate, biphenyl methacrylate, Aryl methacrylates such as diphenylethyl methacrylate, t-butylphenyl methacrylate, terphenyl methacrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, methoxyethyl methacrylate, 2-hydroxyethyl methacrylate, β-methacrylate Mention may be made of carboxyethyl, and methacrylamide.
Examples of acrylic esters include methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, n-pentyl acrylate, n-hexyl acrylate, n-heptyl acrylate, and n-octyl acrylate. , n-decyl acrylate, n-dodecyl acrylate, n-tetradecyl acrylate, n-hexadecyl acrylate, n-octadecyl acrylate, isopropyl acrylate, isobutyl acrylate, t-butyl acrylate, isopentyl acrylate, acrylic Acrylic acid alkyl esters such as amyl acid, neopentyl acrylate, isohexyl acrylate, isoheptyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate and t-butylcyclohexyl acrylate, phenyl acrylate, biphenyl acrylate, Acrylic acid aryl esters such as diphenylethyl acrylate, t-butylphenyl acrylate, terphenyl acrylate, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, methoxyethyl acrylate, 2-hydroxyethyl acrylate, β-acrylate Examples include carboxyethyl and acrylamide.
The acrylic monomer is one or more selected from the group consisting of these.

The size press for applying the surface sizing agent to the base paper is a conventionally known method. Size presses include, for example, incline size press, horizontal size press, rod metaling size press, roll metaling size press, and blade metaling size press as film transfer methods, and rod metaling size presses such as shim sizer, opticizer, and speed. Examples include sizers and film presses, and roll metering size presses include gate roll coaters. Other examples include a bill blade coater, a twin blade coater, a Belvapa coater, a tab size press, and a calendar size press.

In some embodiments, the wallpaper backing paper comprises a base paper comprising at least wood pulp, a filler, a wet strength agent, a dry strength agent, and a polyethylene wax, and a surface sizing agent applied to the base paper. and the surface sizing agent contains at least starch and a styrene acrylic resin, the filler contains at least calcined kaolin, and the calcined kaolin is 66% by mass or more and 94% by mass or less based on the entire filler, and The polyethylene wax contains at least oxidized polyethylene wax.
In at least one embodiment, the wallpaper backing paper comprises a base paper comprising at least wood pulp, a filler, a wet strength agent, a dry strength agent and a polyethylene wax, and a surface sizing agent applied to the base paper. The surface sizing agent contains at least starch and a styrene acrylic resin, the filler contains at least calcined kaolin, and the calcined kaolin is 66% by mass or more and 94% by mass or less based on the entire filler, and the The paper strength agent includes at least a polyamide polyamine epihalohydrin resin, the dry paper strength agent includes at least a polyacrylamide resin, and the polyethylene wax includes at least an oxidized polyethylene wax.

Hereinafter, the present invention will be explained in more detail with reference to Examples. Note that the present invention is not limited to these examples. Here, "parts by mass" and "% by mass" represent "parts by mass" and "% by mass" of the dry solid content or the substantial component amount, respectively. The amount applied indicates the amount of dry solid content.

For each Example and each Comparative Example, wallpaper lining paper was produced by the following procedure.

<Base paper>
A paper stock was prepared using water as a medium as described below.
LBKP (freeness 450 ml csf) 650 parts by mass NBKP (freeness 530 ml csf) 350 parts by mass Filler Types and amounts are listed in Table 1 Alkyl ketene dimer 2 parts by weight Aluminum sulfate 5 parts by weight Wet paper strength agent Types and amounts are Dry paper strength agent Types and amounts are listed in Table 1 Wax Types and amounts are listed in Table 1

Each material listed in Table 1 is as follows.
Filler A: Light calcium carbonate Filler B: Kaolin Filler C: Calcined kaolin Wet strength agent A: Polyamide polyamine epihalohydrin resin Wet strength agent B: Urea formaldehyde resin Dry strength agent A: Polyacrylamide resin Dry strength agent B: Cation Modified starch Wax A: Low density polyethylene wax Wax B: Oxidized polyethylene wax Wax C: Paraffin wax

<Surface sizing agent>
A surface size liquid containing surface size was prepared using water as a medium as described below.
Oxidized starch The blending amount is listed in Table 1 Styrene acrylic resin The blending amount is listed in Table 1 Polyvinyl alcohol The blending amount is listed in Table 1

The polyamide polyamine epihalohydrin resin is a polyamide polyamine epichlorohydrin resin, Seiko PMC Co., Ltd. WS4020, the urea formaldehyde resin is Mitsui Chemicals Euramin (registered trademark) P-1500, and the cationized starch is Nihon Shokuhin Kako Co., Ltd. Neotac (registered trademark). #30T, anionic polyacrylamide resin POLYSTRON (registered trademark) 117 from Arakawa Chemical Co., Ltd. for the polyacrylamide resin, Mitsui Chemicals Hiwax 220P for the low density polyethylene wax, and Toho Chemical Co., Ltd. for the oxidized polyethylene wax. Meikatex PEC-270, paraffin wax 135 from Nippon Seirin, oxidized starch MS#3800 from Nihon Shokuhin Kako, styrene acrylic resin Harima Kasei KN500, polyvinyl alcohol. Kuraray Poval (registered trademark) 5-98 manufactured by Kuraray Co., Ltd. was used.

<Preparation of wallpaper lining paper>
The above paper stock was made using a Fourdrinier paper machine to obtain a base paper with a basis weight of 90 g/m ² . Subsequently, a surface sizing liquid containing a surface sizing agent was applied to both sides of the obtained base paper using a size press and dried. The total amount of surface sizing agent applied was 4 g/m ² per side in terms of dry solid content. After size pressing, the paper was calendered to form a wallpaper backing paper. However, in Comparative Example 2, size pressing was not performed.

<Extent of roll staining>
In the production of wallpaper lining paper, we observed stains generated on conveyor rolls during the drying process after papermaking. The results were evaluated according to the following criteria. In the present invention, if the wallpaper lining paper is rated A or B, it is assumed that the rolls are free of stains.
A: Good condition with no roll stains.
B: There is almost no roll staining, and the roll is generally good.
C: Inferior to the above B, with slight roll stains observed.
D: Inferior to the above C, roll stains are observed.

<Wet strength>
The wallpaper lining paper was cut to 15 mm on the MD side x 250 mm on the CD side. The cut wallpaper backing paper was dried at 110° C. for 10 minutes. After drying, the wallpaper lining paper is immersed in water at 20°C for 10 minutes, and after immersion, the water adhering to the surface of the wallpaper lining paper is wiped off, and ISO 3781:1983 "Paper and board - Determination of tensile strength after immersion in wa" is carried out. ter” The wet tensile strength was measured in accordance with the following. The measurement results were evaluated based on the following criteria. In the present invention, the wallpaper backing paper is considered to have wet strength if it is rated A or B.
A: 0.4kN/m or more.
B: 0.35 kN/m or more and less than 0.4 kN/m.
C: Less than 0.35 kN/m.

<Concealment>
A vinyl chloride resin paste was applied to wallpaper lining paper using an experimental blade coater and dried to prepare a wallpaper sample. Coating and drying were adjusted so that the final thickness of the vinyl chloride resin was 100 μm. Starch paste was applied to the wallpaper lining paper surface of the wallpaper sample, and the sample was attached to a gypsum board to obtain a test piece. The test specimen was left at room temperature until the starch paste dried (about 3 days). After being left standing, the hiding power of the wallpaper was observed from the viewpoint of the extent to which the plasterboard was visible. The results were evaluated according to the following criteria. In the present invention, if the wallpaper lining paper is rated A, B or C, it is considered to have excellent concealment properties.
A: Very good concealability.
B: Good concealability.
C: Although inferior to the above B, the hiding property is generally good.
D: Although inferior to the above C, it has a practical concealment property.
E: Inferior to D above, concealment is insufficient.

<Peel-up properties>
A vinyl chloride resin paste was applied to wallpaper lining paper using an experimental blade coater and dried to prepare a wallpaper sample. Coating and drying were adjusted so that the final thickness of the vinyl chloride resin was 100 μm. Starch paste was applied to the wallpaper lining paper surface of the wallpaper sample, and the sample was attached to a gypsum board to obtain a test piece. After pasting, the test specimen was allowed to stand at room temperature for one week. After standing still, the wallpaper sample was peeled off from the gypsum board, and the surface of the gypsum board was observed from the viewpoint of how much of the wallpaper lining paper remained. The results were evaluated according to the following criteria. In the present invention, the wallpaper lining paper is considered to have good peel-up properties if it is rated A, B, or C.
A: The base paper of the wallpaper lining paper does not remain on the plasterboard, which is extremely good.
B: Almost no base paper of the wallpaper lining paper remained on the plasterboard, which was good.
C: Although inferior to B above,
The base paper of the wallpaper lining paper does not remain on the plasterboard and is generally in good condition.
D: Although some of the base paper of the wallpaper lining paper remains on the plasterboard,
The peeling surface of the gypsum board is generally flat, making it practical.
E: The base paper of the wallpaper lining paper remains on the plasterboard,
Unevenness is observed on the peeled surface of the gypsum board due to the adhesion of the base paper.

The evaluation results are shown in Table 2.

From Tables 1 and 2, Examples 1 to 13 that satisfy the constitution of the present invention do not cause stains on the conveyor rolls that exist during the drying process during manufacturing, have good peel-up properties after use, and are easy to conceal. It can be seen that the wallpaper lining paper has excellent properties and wet strength. On the other hand, Comparative Examples 1 to 6 that do not satisfy the constitution of the present invention are wallpaper lining papers that do not satisfy at least one of the above effects.

Mainly, from the comparison between Examples 1 to 5, it can be seen that when the calcined kaolin in the base paper is 66% by mass or more and 94% by mass or less based on the entire filler, the hiding property of the wallpaper lining paper is improved. .

Mainly from the comparison between Example 3 and Examples 6-8, it can be seen that the wallpaper backing paper has better wet strength when the surface sizing agent contains at least starch and styrene acrylic resin.

Claims (3)

A base paper containing at least wood pulp, a filler, a wet paper strength agent, a dry paper strength agent, and a polyethylene wax, and a surface sizing agent applied to the base paper, the filler containing at least calcined kaolin, Wallpaper backing paper, wherein the polyethylene wax comprises at least oxidized polyethylene wax. The wallpaper lining paper according to claim 1, wherein the calcined kaolin accounts for 66% by mass or more and 94% by mass or less based on the entire filler. The wallpaper lining paper according to claim 1 or 2, wherein the surface sizing agent contains at least starch and styrene-acrylic resin.