Flooring

Abstract

The object of the present invention is to provide a flooring material that is excellent in stain resistance and stain removal, as well as excellent in slip resistance. [Solution] A flooring material comprising a flooring material body including a resin layer and a surface protective layer on the flooring material body, wherein the surface protective layer includes a cured product of an ionizing radiation-curable resin composition, and the ionizing radiation-curable resin composition includes at least one selected from ionizing radiation-curable silicone-modified urethane (meth)acrylate resin and ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin, and anti-slip particles.

Description

[Technical Field]

[0001] This invention relates to flooring materials. [Background technology]

[0002] Various types of flooring materials have been widely used for a long time. Among them, flooring materials containing a resin layer are easily scratched and soiled when stepped on by the soles of feet or shoes. For this reason, scratch resistance and stain resistance are required as characteristics of flooring materials containing a resin layer. Scratch resistance refers to the property of the flooring material not being easily scratched, while stain resistance refers to the property of being resistant to dirt or being able to easily remove dirt. Ionizing radiation-curable resins have excellent scratch resistance properties and are used to coat various substrates, including flooring surface coatings.

[0003] For example, Patent Document 1 discloses a floor sheet characterized by having a base sheet made of a non-chlorine thermoplastic resin, with one or more layers of non-chlorine thermoplastic resin interposed between them, and the surface of which is provided with a transparent resin layer suitable for repainting with electron beam or ultraviolet curable resin, and the imparting of abrasion resistance and durability is being considered.

[0004] Furthermore, Patent Document 2 discloses a photocurable (meth)acrylate resin composition with excellent decontamination properties, characterized by comprising (A) a photocurable (meth)acrylate resin, (B) a photocurable polysiloxane-based urethane (meth)acrylate resin, (C) a photocurable silicone block (meth)acrylate resin, and (D) a photopolymerization initiator. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2003-13587 [Patent Document 2] Patent No. 3945628 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, the floor sheet described in Patent Document 1 does not have sufficient stain resistance or stain removal properties, and further improvements are needed. On the other hand, the photocurable resin composition described in Patent Document 2 is said to have superior stain removal properties compared to conventional photocurable resin compositions, but the photocurable resin composition described in Patent Document 2 has high sliding properties and is not suitable for floor material applications where slip resistance is required.

[0007] The object of the present invention is to provide a flooring material that is excellent in stain resistance and stain removal, as well as excellent in slip resistance. [Means for solving the problem]

[0008] The present invention relates to a flooring material comprising a flooring material body including a resin layer and a surface protective layer on the flooring material body, wherein the surface protective layer comprises a cured product of an ionizing radiation-curable resin composition, and the ionizing radiation-curable resin composition comprises at least one selected from ionizing radiation-curable silicone-modified urethane (meth)acrylate resin and ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin, and anti-slip particles. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a flooring material that is excellent in stain resistance and stain removal, as well as excellent in slip resistance. [Brief explanation of the drawing]

[0010] [Figure 1] This is a plan view showing one embodiment of the flooring material of the present invention. [Figure 2] This is a cross-sectional view of the flooring material shown in Figure 1, cut in the thickness direction. [Figure 3] This is a cross-sectional view showing one embodiment of the flooring material of the present invention. [Figure 4] This is an image of a coating of anti-slip particles. [Figure 5]These are the test results of antifouling property and stain removability.

Embodiments for Carrying Out the Invention

[0011] As a result of studying the above problems, by using a cured product of an ionizing radiation-curable resin composition containing at least one selected from an ionizing radiation-curable silicon-modified urethane (meth)acrylate resin and an ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin and anti-slip particles in the surface protective layer, it has been found that it is excellent in antifouling property, stain removability, and anti-slip property.

[0012] Regarding the mechanism by which the flooring material of the present invention is excellent in antifouling property and stain removability and is also excellent in anti-slip property, it can be speculated as follows. The flooring material of the present invention contains at least one selected from an ionizing radiation-curable silicon-modified urethane (meth)acrylate resin and an ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin in an ionizing radiation-curable resin composition excellent in antifouling property. Therefore, due to the slidability and water / oil repellency of the functional groups of silicon and fluorine, it is difficult for dirt substances to adhere to the surface of the ionizing radiation-curable resin, and the adhered dirt substances are also easily removed. Regarding the anti-slip property, it is presumed that since fine irregularities due to anti-slip particles are formed on the surface of the surface protective layer, when a person steps on it, it can sink into the sole of the foot or the sole of the shoe and have appropriate anti-slip property. Since the resin containing silicon and fluorine is ionizing radiation-curable, it will firmly adhere integrally as an ionizing radiation-curable resin composition to the surface of the anti-slip particles that form fine irregularities during the curing of the ionizing radiation-curable resin composition. Further, since the ionizing radiation-curable resin is the main component, the anti-slip particles and the ionizing radiation-curable resin composition adhering to the surface of the anti-slip particles are difficult to peel off from the sole of the foot or the sole of the shoe when a person steps on the flooring material. Thus, it is possible to prevent both a decrease in anti-slip property due to peeling of the surface of the anti-slip particles and a decrease in antifouling property due to peeling of the resin containing silicon and fluorine. Also, unlike the case of mixing a silicon and fluorine resin composition such as silicone oil or fluororesin into an ionizing radiation-curable resin, the anti-slip property does not decrease due to bleeding.

[0013] The floor covering of the present invention has a floor covering body and a surface protection layer on the floor covering body. In this specification, the upper side refers to the side far from the floor surface when the floor covering is laid on the floor surface, and is also referred to as the front side. Further, the lower side refers to the side close to the floor surface when the floor covering is laid on the floor surface, and is also referred to as the back side.

[0014] FIG. 1 is a plan view showing one embodiment of the floor covering of the present invention, and FIG. 2 is an enlarged cross-sectional view of the floor covering cut in the thickness direction. The floor covering 1 in the illustrated example is formed in a long strip shape in plan view. The long strip shape is a rectangular shape in which the length in one direction is sufficiently longer than the length in the other direction (the other direction is the direction orthogonal to the one direction). For example, the length in one direction is 2 times or more, preferably 4 times or more the length in the other direction. The long strip-shaped floor covering 1 is usually wound around a roll for storage and transportation, and at the construction site, it is cut into a desired shape and used. However, the floor covering of the present invention is not limited to a long strip shape, and may be formed in a sheet shape such as a square shape in plan view (not shown).

[0015] In the present invention, the floor covering body 2 is the main part that constitutes the strength and weight of the floor covering. In the present invention, the floor covering body 2 includes a resin layer 22 containing a synthetic resin component. As long as the floor covering body 2 includes the resin layer 22, those known in the art can be used. For example, as shown in FIG. 2, the floor covering body 2 may have a structure in which layers such as a base material layer 21, a shape stabilizing layer 23, a decorative layer 24, and a surface layer 3 are arbitrarily combined.

[0016] The synthetic resin component of the resin layer 22 is not particularly limited, but a thermoplastic resin is preferred. Examples of the thermoplastic resin include vinyl chloride resin, olefin resin, vinyl acetate resin, acrylic resin, amide resin, ester resin, various elastomers, rubber, etc. From the viewpoints of processability, flexibility, cost, etc., vinyl chloride resin is preferred. The synthetic resin component may be used alone or in combination of two or more.

[0017] As the vinyl chloride resin, paste vinyl chloride-based resin, suspension vinyl chloride-based resin, etc. are used.

[0018] The paste vinyl chloride resin is, for example, a paste-like vinyl chloride resin obtained by emulsion polymerization, and its viscosity can be adjusted as appropriate with a plasticizer. The paste vinyl chloride resin is a fine powder with a particle size of 0.1 to 10 μm (preferably 1 to 3 μm) consisting of aggregates of many fine particles, and preferably the surface of the fine powder is coated with a surfactant. The average degree of polymerization of the paste vinyl chloride resin is preferably about 1000 to 2000.

[0019] The suspension vinyl chloride resin is, for example, a vinyl chloride resin obtained by suspension polymerization. The suspension vinyl chloride resin is a fine powder with a particle size of preferably 20 μm to 100 μm. The average degree of polymerization of the suspension vinyl chloride resin is preferably about 700 to 1500, more preferably about 700 to 1100, and even more preferably about 700 to 1000. However, the particle size is the median diameter (D) in the volume-based particle size distribution. 50 )

[0020] The aforementioned vinyl chloride resins are preferably those with a K value of approximately 60 to 95, and more preferably those with a K value of approximately 65 to 80.

[0021] The content of synthetic resin components in the resin layer 22 is not particularly limited, but can be, for example, 5 to 100% by mass.

[0022] The resin layer 22 may optionally contain additives, such as fillers, plasticizers, flame retardants, stabilizers, antioxidants, lubricants, colorants, and foaming agents.

[0023] The resin layer 22 may be non-foamed or foamed. If the resin layer 22 is foamed, from the viewpoint of providing good cushioning to the flooring material, the foaming ratio is preferably 1.05 times or more, more preferably 1.1 times or more, and from the viewpoint of preventing it from becoming too soft, it is preferably 10 times or less, and more preferably 5 times or less. That is, the foaming ratio of the resin layer 22 is preferably 1.05 to 10 times, and more preferably 1.1 to 5 times.

[0024] When there are multiple resin layers 22, the physical properties of each resin layer 22 (material, presence or absence of foaming, thickness, etc.) may be the same or different.

[0025] The base layer 21 is the lowest layer of the flooring material and is intended to increase the adhesive strength between the flooring material and the adhesive used to bond it to the floor surface during installation (hereinafter referred to as floor adhesive), thereby suppressing warping of the flooring material. The base layer 21 is not particularly limited, but conventionally known sheet materials such as nonwoven fabric, woven fabric, paper, and felt can be used. The material of the fibers constituting the nonwoven fabric or woven fabric is not particularly limited and includes, for example, synthetic resin fibers such as polyester and polyolefin; inorganic fibers such as glass and carbon; and natural fibers.

[0026] The shape-stabilizing layer 23 is a layer designed to suppress dimensional changes in the flooring material due to shrinkage and expansion over time. The surface protection layer 4 of the flooring material 1 shrinks during the curing and molding of the ionizing radiation-curable resin composition. Because the flooring material 1 is made of resin, unlike flooring materials made of other materials such as wood, stone, and ceramic, it is prone to warping when it shrinks. Furthermore, to increase stain resistance, it is desirable to cover the surface of the anti-slip particles 5 with the resin of the surface protection layer 4, and the thickness of the surface protection layer 4 needs to be increased in order to adequately cover the anti-slip particles 5. Figure 4 shows an image of the coating of anti-slip particles. When the thickness T of the surface protection layer is increased, the surface protection layer 4 shrinks more significantly during curing, making the flooring material 1 more prone to warping. When the flooring material warps, it may become difficult to lay it on the floor surface, walking may become difficult if the sides of the joints are exposed, and problems such as staining of the joints may occur. To prevent these problems, it is desirable to provide the shape-stabilizing layer 23.

[0027] The shape stabilization layer 23 is preferably provided at approximately the center of the overall thickness of the flooring material 1. By providing the shape stabilization layer 23 at this position, the dimensional stability of the flooring material 1 is enhanced and warping of the edges of the flooring material 1 can be prevented. Furthermore, from the viewpoint of effectively suppressing warping due to curing shrinkage of the surface protection layer 4, it is preferable to provide two or more shape stabilization layers. An example of an embodiment in which two or more shape stabilization layers are provided is shown in Figure 3. In the example shown in Figure 3, the shape stabilization layer 23 consists of two layers, a first shape stabilization layer 231 and a second shape stabilization layer 232, with a first resin layer 221, a second resin layer 222, and a third resin layer 223 laminated between these shape stabilization layers 231 and 232. For example, the distance between the first shape stabilization layer 231 and the second shape stabilization layer 232 is 1.0 to 2.0 mm, preferably 1.2 to 1.6 mm. To suppress warping of the flooring material, it is preferable that the first shape stabilization layer 231 is located slightly below the center of the overall thickness of the flooring material, and the two layers of the second shape stabilization layer 232 are located above the center of the overall thickness of the flooring material.

[0028] Examples of the shape-stabilizing layer 23 include nonwoven fabrics and woven fabrics. The material of the fibers constituting the nonwoven or woven fabric is not particularly limited, but examples include synthetic resin fibers, inorganic fibers, and natural fibers. Examples of synthetic resin fibers include polyester and polyolefin, examples of inorganic fibers include glass and carbon, and examples of natural fibers include pulp. From the viewpoint of dimensional stability, a glass sheet containing glass fibers is preferably used, and as the glass sheet, for example, a glass fiber nonwoven fabric such as a glass mat, or a glass fiber woven fabric such as a glass cloth is preferred. The fiber material may be used alone, or two or more types may be used, such as a mixture of glass fibers and pulp. The basis weight of the nonwoven or woven fabric is not particularly limited, but from the viewpoint of improving the dimensional stability of the flooring material, 10 g / m 2 The above is preferable, 20g / m 2 The above is preferable, and from the viewpoint of ensuring appropriate flexibility and processability, 100g / m 2 The following is preferable: 50 g / m 2 The following is more preferable: the basis weight of the nonwoven or woven fabric should be 10-100 g / m². 2is preferred, and 20 to 50 g / m 2 is more preferred.

[0029] The glass fiber nonwoven fabric is such that a plurality of glass fibers overlap or intertwine in the vertical direction (thickness direction) in a disorderly manner and they are bound by a binder such as an adhesive or they bind to each other to form a layer, or a plurality of glass fibers overlap or intertwine in the vertical direction with a certain degree of regularity and they are bound by a binder such as an adhesive or they bind to each other to form a layer.

[0030] As the binder, those with high bonding properties to glass fibers are preferred, and those with high bonding properties to glass fibers and the bonding resin described later are more preferred. Examples of such binders include electron beam curable adhesives such as one-component adhesives, two-component adhesives, thermosetting adhesives, hot melt adhesives, and ultraviolet curable adhesives. Specifically, one or more mixtures selected from urethane resins, vinyl acetate resins, styrene-butadiene copolymers, acrylic resins, vinyl chloride resins, and epoxy resins are exemplified. The thickness of the glass fiber is, for example, 5 μm to 30 μm in diameter, preferably 8 μm to 20 μm in diameter, and the length is, for example, 10 mm to 30 mm.

[0031] Also, the basis weight of the glass sheet is not particularly limited, but preferably 10 g / m 2 ~100 g / m 2 and more preferably 20 g / m 2 ~ to 50 g / m 2 is. If the thickness or basis weight of the glass sheet is too small, the tensile strength and dimensional stability of the floor covering 1 cannot be sufficiently improved. On the other hand, if it is too large, there is a possibility that the bonding resin will not sufficiently spread into the openings of the glass sheet. The density of the glass sheet is not particularly limited, but is, for example, 0.1 g / cm 3 ~0.5 g / cm 3 is.

[0032] The glass sheets, such as the glass fiber nonwoven fabric and glass fiber woven fabric, have countless openings between the glass fibers. Conceptually, each of these openings is a continuous series of gaps between adjacent glass fibers in the thickness direction of the glass sheet.

[0033] Since the glass sheet has countless openings, a ventilation channel is ensured within the surface of the glass sheet, connecting the front side to the back side. A larger opening ratio of the glass sheet results in higher breathability, while a smaller opening ratio results in lower breathability. In this specification, the opening ratio is evaluated by measuring the breathability of the glass sheet, taking these points into consideration. The opening ratio refers to the total area of ​​openings per unit area of ​​the glass sheet's surface.

[0034] To improve bonding performance, it is preferable to use a glass sheet with high breathability, that is, a glass sheet with a relatively large opening ratio. On the other hand, in order to impart the strength and dimensional change suppression effects of the glass sheet to the flooring material 1, there is a certain upper limit to the opening ratio of the glass sheet. From this viewpoint, the breathability of the glass sheet is preferably 100 ml / cm². 2 ·sec~550ml / cm 2 ·sec, more preferably 200 ml / cm³ 2 ·sec~450ml / cm 2 It is sec.

[0035] Furthermore, the air permeability of the glass sheet is measured in accordance with the air permeability test method of JIS L 1096, using a Fragile type air permeability tester manufactured by Toyo Seiki Seisakusho Co., Ltd., with three glass sheets stacked together. The reason for measuring with three sheets stacked together is that, in the case of glass sheets with a suitable aperture ratio, the air permeability is too high, making it difficult to measure the air permeability using the above method when only one or two sheets are stacked together.

[0036] Furthermore, it is preferable to use a so-called "resin-coated glass sheet," in which a bonding resin is attached to the glass sheet, as the shape-stabilizing layer 23, because the layers adjacent to the back surface and the front surface can be firmly bonded via the bonding resin on the glass sheet. The bonding resin may be attached to the entire surface of the glass fibers, or it may be attached to the entire surface of many glass fibers and to a portion of the surface of the remaining glass fibers. Also, the bonding resin may be attached uniformly to the surface of the glass fibers, or it may be attached unevenly.

[0037] The preferred range for air permeability of resin-coated glass sheets is smaller than that of non-resin-coated sheets, and specifically, preferably 80 ml / cm³. 2 ·sec~500ml / cm 2 ·sec, more preferably 100 ml / cm³ 2 ·sec~400ml / cm 2 It is preferable to set it to be within the range of .sec.

[0038] The bonding resin for the aforementioned resin-coated glass sheet is not particularly limited as long as it bonds to either the glass fibers or the resin layer in contact with the glass fibers, and conventionally known resins can be used. Specifically, it is preferable to use the same type of resin as the resin layer in contact with the glass fibers, and if the resin layer in contact with the glass fibers has a vinyl chloride resin as its main component, it is preferable to include a vinyl chloride resin.

[0039] The thickness of the shape stabilization layer 23 is not particularly limited, but from the viewpoint of suppressing warping of the flooring material and improving dimensional stability, it is preferably 0.1 mm or more. Furthermore, from the viewpoint of not making the flooring material too thick and not reducing the amount of resin components contained in the flooring material, it is preferably 1.0 mm or less, more preferably 0.8 mm or less, and even more preferably 0.7 mm or less. In other words, the thickness of the shape stabilization layer is preferably 0.1 to 1.0 mm, more preferably 0.1 to 0.8 mm, and even more preferably 0.1 to 0.7 mm. However, this does not apply when the shape stabilization layer 23 is a resin-coated glass sheet, in which case it can be, for example, 0.4 to 1.0 mm.

[0040] As described above, the thickness T of the surface protection layer 4 needs to be sufficient to cover the anti-slip particles 5. However, as the thickness T of the surface protection layer 4 increases, the shrinkage force of the surface protection layer 4 increases, making the flooring material 1 more prone to warping. In particular, if the particle size of the anti-slip particles 5 is increased to provide a flooring material with excellent anti-slip properties, the thickness T of the surface protection layer 4 needs to be increased, making the flooring material 1 even more prone to warping. By configuring the shape stabilization layer 23 of the flooring material 1 as described above, even if the thickness T of the surface protection layer 4 of the present invention is sufficient to cover the anti-slip particles, it is possible to suppress warping of the flooring material 1 and maintain its flatness. Generally, in the case of ordinary flooring materials installed with adhesive, the flooring material is fixed to the floor surface with adhesive, so warping of the flooring material can be suppressed. However, in the case of simple loose-lay flooring materials installed with adhesive, it is difficult to suppress warping of the flooring material with adhesive. If the edges warp upward after installation, it spoils the appearance and creates steps in the joints, causing dirt to accumulate and reducing stain resistance. Flooring material 1 equipped with a shape-stabilizing layer 23 can suppress warping, and can therefore be suitably used not only as flooring materials installed with ordinary adhesives but also as simple loose-lay flooring materials.

[0041] The decorative layer 24 is a layer for adding design appeal to the flooring material 1. The decorative layer 24 is preferably provided on the surface side of the flooring material body 2. The decorative layer 24 is not particularly limited as long as it adds design appeal, but it is preferably made of a thermoplastic resin, for example, with a design printed on the surface or colored. Examples of thermoplastic resins include vinyl chloride resin, olefin resin, vinyl acetate resin, acrylic resin, amide resin, ester resin, various elastomers, and rubber, and vinyl chloride resin is preferred from the viewpoint of adhesion to the surface layer 3.

[0042] The surface layer 3 is a layer that provides durability, abrasion resistance, scratch resistance, etc., to the flooring material 1. The surface layer 3 is intended to prevent wear of the flooring material body 2 when the surface protective layer 4 is worn, and to make the surface protective layer 4 less likely to peel off. The surface layer 3 is not particularly limited, but for example it is formed from a thermoplastic resin and a plasticizer. Examples of thermoplastic resins include vinyl chloride resin, olefin resin, vinyl acetate resin, acrylic resin, amide resin, ester resin, various elastomers, and rubber, with vinyl chloride resin being preferred from the viewpoint of flexibility, processability, durability, and cost. For vinyl chloride resin, paste vinyl chloride resins and suspension vinyl chloride resins are used. The thermoplastic resin may be used alone or in combination of two or more types. Examples of plasticizers include benzoic acid ester plasticizers and phthalic acid ester plasticizers. The plasticizer may be used alone or in combination of two or more types.

[0043] The surface protection layer 4 is the outermost layer of the flooring material 1 and protects the flooring material body 2. The surface protection layer 4 may be transparent or opaque, but it is preferable that it be transparent so that the design of the decorative layer 24 and other elements provided on the back side of the surface protection layer 4 can be seen. The surface protection layer 4 is preferably 2 to 50 μm thick, and more preferably 5 to 35 μm thick, because it exhibits scratch resistance without making the entire surface protection layer brittle and also has excellent impact resistance. In particular, a layer thickness of 3 μm or more provides sufficient scratch resistance, and a layer thickness of 35 μm or less prevents the overall rigidity of the flooring material from becoming too high, making it less prone to cracking and easier to process.

[0044] In the present invention, the surface protective layer 4 includes a cured product of an ionizing radiation-curable resin composition, wherein the ionizing radiation-curable resin composition includes at least one selected from ionizing radiation-curable silicone-modified urethane (meth)acrylate resin and ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin, and anti-slip particles.

[0045] The ionizing radiation-curable resin used in the surface protective layer 4 of the present invention refers to a resin that has energy quanta capable of crosslinking and polymerizing monomers, etc., in the presence of charged particle beams or electromagnetic waves, that is, a resin that has been crosslinked and cured by irradiation with electron beams or ultraviolet light, and can be obtained by irradiating an ionizing radiation-curable resin composition with electron beams or light using known methods. The ionizing radiation-curable resin is, for example, a resin in which a curable monomer or oligomer has been cured by ionizing radiation. The curable monomer or oligomer is not particularly limited as long as it can be cured by ionizing radiation, and the curable monomer can be one or more conventionally known monofunctional monomers, difunctional monomers, or polyfunctional monomers of three or more functions that have properties such as hardness, gloss, and stain resistance required for the surface protective layer 4 and are suitable for coating, and can be used alone or in combination of two or more. As the curable oligomer, one or more oligomers such as bisphenol A type, novolac type, polybutadiene type epoxy (meth)acrylate, and polyether type urethane (meth)acrylate, which have properties such as hardness, gloss, and stain resistance required for the surface protective layer 4 and are suitable for coating, can be used. It is preferable to use a curable monomer or oligomer that hardens with ultraviolet light because it can form a relatively strong surface protective layer 4 and is versatile.

[0046] Examples of curable monomers or oligomers include monomers or oligomers having polymerizable unsaturated bonding groups such as (meth)acrylate groups or (meth)acryloyloxy groups, or epoxy groups in the molecule.

[0047] Specific examples of the curable monomer include styrene monomers such as α-methylstyrene, methyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol penta(meth)acrylate, urethane (meth)acrylate, and polyol compounds having two or more thiol groups in the molecule. Specific examples of the curable oligomer include urethane (meth)acrylate, polyester (meth)acrylate, epoxy (meth)acrylate, monofunctional (meth)acrylate or polyfunctional (meth)acrylate having polymerizable unsaturated bonds such as colloidal silica and (meth)acryloylalkoxysilane-derived inorganic hybrid (meth)acrylate, unsaturated polyester, and epoxy.

[0048] Among these, it is preferable to use urethane (meth)acrylate because it can form a flooring material 1 that has moderate flexibility, excellent heat resistance, chemical resistance, and durability, and furthermore, has excellent adhesion to the flooring material body 2.

[0049] The molecular weight of the curable monomer or oligomer is not particularly limited, but examples include a range of 200 to 10000.

[0050] The ionizing radiation-curable resin composition used in the present invention comprises at least one selected from ionizing radiation-curable silicone-modified urethane (meth)acrylate resin and a curable resin obtained by polymerizing ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin, along with anti-slip particles, and optionally includes other components. Other components include non-silicone-modified ionizing radiation-curable resins, non-fluorine-modified ionizing radiation-curable resins, polymerization initiators, and various other additives. As the resin cured by ionizing radiation, photocurable resins are preferred due to their good processability and versatility. Furthermore, it is more preferable to use an ultraviolet-curable resin.

[0051] For example, when mixing an ionizing radiation-curable silicone-modified urethane (meth)acrylate resin with a non-silicone-modified ionizing radiation-curable resin, it is preferable to select photocurable or ultraviolet-curable resins for both to improve workability during manufacturing. The same applies when mixing an ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin with a non-fluorine-modified ionizing radiation-curable resin.

[0052] Ionizing radiation-curable silicone-modified urethane (meth)acrylate resin, being silicone-modified, does not bleed out, can firmly bond to anti-slip particles, suppresses peeling after curing, and offers excellent durability as a flooring material.

[0053] Ionizing radiation-curable silicone-modified urethane (meth)acrylate resins and ionizing radiation-curable fluorine-modified urethane (meth)acrylate resins may contain one or more functional groups that can be used in the curing reaction, preferably two or more. In particular, they may be bifunctional or polyfunctional (meth)acrylates. The polyfunctional (meth)acrylate may contain epoxy groups, hydroxyl groups, amino groups, sulfonic acid groups, or isocyanate groups.

[0054] The combined content of the curable resin obtained by polymerizing ionizing radiation-curable silicone-modified urethane (meth)acrylate resin and ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin is preferably 0.1% to 5% by mass, and more preferably 0.3% to 3% by mass, in the ionizing radiation-curable resin composition. Antifouling properties can be ensured at 0.1% by mass or more, and the slip resistance of the flooring material will not be impaired at 0% by mass or less.

[0055] Furthermore, as polymerizable monomers for ionizing radiation-curable fluorine-modified urethane (meth)acrylate resins and ionizing radiation-curable fluorine-modified urethane (meth)acrylate resins, (meth)acrylate monomers having radical polymerizable unsaturated groups in the molecule are preferred because they exhibit good polymerizability.

[0056] Ionizing radiation-curable silicone-modified urethane (meth)acrylate resin is a type of ionizing radiation-curable silicone-modified urethane (meth)acrylate resin in which (meth)acrylic groups are introduced to one or both ends of a polysiloxane. An example of an ionizing radiation-curable silicone-modified urethane (meth)acrylate resin is an ionizing radiation-curable polysiloxane-based urethane (meth)acrylate resin, which is formed when functional groups in the polysiloxane and functional groups in the urethane (meth)acrylate resin chemically react and bond. It is preferable to have 1 to 6 (meth)acrylic groups, and they are broadly classified into side-chain type, double-ended type, single-ended type, and side-chain double-ended type depending on the bonding position of the substituted organic group, but there are no particular restrictions on the bonding position of the organic group.

[0057] In the present invention, a silicon-modified urethane (meth)acrylate resin is preferably an ionizing radiation-curable polysiloxane-based urethane (meth)acrylate resin, and one or more polydialkylsiloxane-based urethane (meth)acrylates can be used. Preferably, it is a polydimethylsiloxane-based urethane (meth)acrylate, which is synthesized, for example, by reacting isocyanates, silicone polyols, and hydroxyalkyl (meth)acrylates, and has an acryloyl group (CH2=CH-CO-) or a methacryloyl group (CH2=C(CH3)-CO-) as a functional group in the molecule, and has a urethane bond (-NH-COO-) and a polydialkylsiloxane bond, preferably a polydimethylsiloxane bond (-(-Si(CH3)2-O-)n-). These can be synthesized by known methods. In the present invention, "(meth)acrylate" is a general term for acrylate and methacrylate.

[0058] On the other hand, the fluorine-modified (meth)acrylate used in the present invention can be produced by reacting a compound having a perfluoro group with a (meth)acrylate. For example, the curable fluorine-based compound is a polyfunctional (meth)acrylate formed by reacting a compound having a perfluoro group, such as a perfluoropolyol, a perfluoropolyether polyol, a perfluoropolyether dibasic acid having a carboxylic acid, and a perfluoropolyether epoxy compound having an epoxy group, with a polyfunctional (meth)acrylate such as a modified (meth)acrylate having a carboxylic acid, a (meth)acrylate having an epoxy group, and a (meth)acrylate having an isocyanate group. This polyfunctional (meth)acrylate may include oligomers or prepolymers such as 2-(perfluorodecyl)ethyl (meth)acrylate, 3-perfluorooctyl-2-hydroxypropyl (meth)acrylate, 3-(perfluoro-9-methyldecyl)-1,2-epoxypropane, (meth)acrylic acid-2,2,2-trifluoroethyl, and (meth)acrylic acid-2-trifluoromethyl.

[0059] The ionizing radiation-curable silicone-modified urethane (meth)acrylate resin and the ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin used in this invention cure simultaneously with the ionizing radiation-curable resin composition, forming a photocurable resin layer with high surface hardness. As a result, a good and long-lasting stain-resistant surface can be obtained without silicone or fluorine bleeding out from the surface. Furthermore, because these modified urethane (meth)acrylate resins have urethane bonds within their molecules, they possess moderate toughness due to hydrogen bonding and excellent flexural resistance required for flooring materials. Furthermore, the surface of the surface protection layer 4 of the present invention can be made slippery, improving scratch resistance and other properties. However, this also presents the problem of the surface becoming slippery.

[0060] Conventionally known ionizing radiation-curable resins can be used as silicon-free and fluorine-free ionizing radiation-curable resins. These ionizing radiation-curable resins contain a curable resin formed by polymerization of at least one of monomers and oligomers, which are electron radiation-curable and harden by ionizing radiation, and may contain other components as needed.

[0061] Examples of ionizing radiation-curable monomers or oligomers include monomers or oligomers having polymerizable unsaturated bonding groups such as (meth)acrylate groups or (meth)acryloyloxy groups, or epoxy groups in their molecules. Specific examples of ionizing radiation-curable monomers include styrene monomers such as α-methylstyrene, methyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol penta(meth)acrylate, urethane(meth)acrylate, and polyol compounds having two or more thiol groups in their molecules. Specific examples of ionizing radiation-curable oligomers include acrylates such as urethane(meth)acrylate, polyester(meth)acrylate, and epoxy(meth)acrylate; unsaturated polyesters; and epoxy. These ionizing radiation-curable monomers or oligomers can be used individually or in combination of two or more. Because they are versatile and have excellent processability, it is preferable to use curable monomers or oligomers that harden when exposed to ultraviolet light.

[0062] In particular, as the ionizing radiation-curable monomer or oligomer, it is preferable to use a monomer or oligomer having a (meth)acrylate group in the molecule, and more preferably to use urethane (meth)acrylate.

[0063] The molecular weight of the ionizing radiation-curable monomer or oligomer is not particularly limited, but is preferably in the range of 200 to 10000.

[0064] Ionizing radiation-curable monomers or oligomers are typically used with the addition of polymerization initiators. Examples of polymerization initiators include 2,2-dimethoxy-2-phenylacetophenone, acetophenone, benzophenone, xanthone, 3-methylacetophenone, 4-chlorobenzophenone, 4,4'-dimethoxybenzophenone, benzoinpropyl ether, benzyldimethyl ketal, N,N,N',N'-tetramethyl-4,4'-diaminobenzophenone, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, and other thioxant compounds.

[0065] The anti-slip particles 5 are particles that impart anti-slip properties to the surface protective layer 4. By incorporating them into the surface protective layer 4, fine irregularities are created on the surface of the surface protective layer 4, making it difficult for the soles of feet to slip when standing on the surface protective layer 4. For example, one or more types of inorganic particles can be used as the anti-slip particles 5. Examples of inorganic particles include powders and granules such as silica, alumina, glass, calcium carbonate, barium sulfate, zirconium oxide, silicon nitride, silicon carbide, zeolite, shirasu balloon, diatomaceous earth, silicon dioxide, and diamond, with alumina being preferred from the viewpoint of durability and cost. It is preferable that the surface protective layer 4 of the flooring material 1 of the present invention does not contain photocatalytic particles. Photocatalytic particles consist of titanium oxide, zinc oxide, tin oxide, iron oxide, copper oxide, etc., which have photoactive properties, and are particles that generate reactive oxygen species such as hydrogen peroxide and hydroxyl radicals. The flooring material 1 of the present invention is oxidized and decomposed by the reactive oxygen generated by the photocatalytic particles, reducing its durability, making it easier for the anti-slip particles 5 to peel off from the surface protective layer 4, and thus reducing its stain resistance and anti-slip properties. Therefore, the content of photocatalytic particles in the ionizing radiation-curable resin composition is preferably 4% by mass or less, and more preferably 3% by mass or less.

[0066] The shape of the anti-slip particles 5 can be spherical (such as ellipsoids or spheres), polygonal, flaky, or irregular, but spherical is preferred from the viewpoint of achieving both anti-fouling and anti-slip properties because its corners are rounded. The average particle diameter of the anti-slip particles 5 is preferably 2 μm to 100 μm, more preferably 5 μm to 80 μm, and even more preferably 15 μm to 60 μm. From the viewpoint of providing anti-slip properties without hindering anti-fouling properties, the ratio of the average particle diameter of the anti-slip particles 5 to the thickness of the surface protective layer 4 (particle diameter μm / thickness μm) is preferably 0.1 to 10, more preferably 0.5 to 5, and even more preferably 0.8 to 3. In this specification, the average particle diameter of the anti-slip particles 5 refers to the particle size distribution measurement by laser light diffraction. This creates fine irregularities on the surface of the surface protective layer 4, making it possible to achieve both anti-fouling and anti-slip properties.

[0067] Furthermore, as shown in Figure 4, from the viewpoint of anti-fouling properties, it is preferable that the anti-slip particles 5 are embedded in the surface protective layer 4, and even in the protruding parts, it is preferable that a covering portion 5a is formed where the surface protective layer 4 thinly covers the surface of the anti-slip particles 5. If the anti-slip particles 5 are exposed from the surface protective layer 4, dirt will easily adhere to the exposed areas, and the anti-fouling properties will deteriorate. For example, the thickness of the covering portion 5a is 1 μm to 10 μm, preferably 4 to 8 μm. If the thickness of the covering portion 5a is less than the lower limit, the covering portion 5a will easily peel off, and if it is greater than the upper limit, it will be difficult to form the unevenness caused by the anti-slip particles 5.

[0068] The content of anti-slip particles 5 in the ionizing radiation-curable resin composition is preferably 5 to 60% by mass, more preferably 10 to 45% by mass, and even more preferably 12 to 30% by mass, from the viewpoint of processability such as viscosity. When two or more types of anti-slip particles 5 are used, the content of anti-slip particles 5 refers to the total amount.

[0069] It is preferable that an ionizing radiation polymerization initiator be added to the ionizing radiation curable resin composition. Examples of ionizing radiation polymerization initiators include benzoin-based ionizing radiation polymerization initiators, acetophenone-based ionizing radiation polymerization initiators, benzophenone-based ionizing radiation polymerization initiators, and thioxanthone-based ionizing radiation polymerization initiators.

[0070] Examples of benzoin-based ionizing radiation polymerization initiators include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin isobutyl ether.

[0071] Examples of acetophenone-based ionizing radiation polymerization initiators include benzyldimethyl ketal (also known as 2,2-dimethoxy-2-phenylacetophenone), diethoxyacetophenone, 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, 4-t-butyl-trichloroacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 1-(4-dodecylphenyl)-2-hydroxy-2-methylpropan-1-one, 4-(2-hydroxyethoxy)-phenyl(2-hydroxy-2-propyl)ketone, 1-hydroxycyclohexylphenyl ketone, and 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropane-1, with benzyldimethyl ketal and 1-hydroxycyclohexylphenyl ketone being preferred.

[0072] Examples of benzophenone-based ionizing radiation polymerization initiators include benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone, acrylic benzophenone, 4-benzoyl-4'-methyldiphenyl sulfide, and 3,3'-dimethyl-4-methoxybenzophenone.

[0073] Examples of thioxanthone-based ionizing radiation polymerization initiators include thioxanthone, 2-chlorthioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-dichlorothioxanthone, 2,4-diethylthioxanthone, and 2,4-diisopropylthioxanthone.

[0074] The ionizing radiation polymerization initiator is used in a proportion of 0.1 to 10 parts by mass, preferably 1 to 8 parts by mass, and more preferably 2 to 6 parts by mass, per 100 parts by mass of the total ionizing radiation curable lipid composition.

[0075] In addition, the ionizing radiation-curable resin composition may optionally contain additives as needed, to the extent that it does not impair the objectives of the present invention. Examples of additives include solvents, leveling agents, fine particles other than anti-slip particles, fillers, dispersants, plasticizers, ultraviolet absorbers, surfactants, antioxidants, thixotropizing agents, polymerization inhibitors, reactive diluents, non-reactive diluents, matting agents, defoaming agents, settling inhibitors, heat stabilizers, (meth)acrylate monomers, and compositions containing curable resins.

[0076] Examples of solvents include alcohols, ketones, esters, ethers, glycols, cellosolves, aliphatic hydrocarbons, and aromatic hydrocarbons. The solvent may be used alone or in combination of two or more.

[0077] Examples of (meth)acrylate monomers that may be used as needed in the present invention include esters of alkylene polyols or low polymerization polyether polyols with (meth)acrylic acid, such as 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, 2(2-ethoxyethoxy)ethyl acrylate, tetrahydrofurfuryl acrylate, 2-phenoxyethyl acrylate, diethylene glycol diacrylate, tetraethylene glycol diacrylate, 1,3-butylene glycol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, and hydroxypivalic acid neopentyl glycol diacrylate.

[0078] The ionizing radiation-curable resin composition of the present invention is applied to the floor material body 2 of the floor material 1 using a coating machine such as a rubber or sponge roll coater, spray, or vacuum coater. By irradiating the coated surface with an electron beam or light, preferably ultraviolet light, the wet coating is cured, resulting in a cured coating (film) with excellent stain removal properties. There are no particular restrictions on the number of coats of the ionizing radiation-curable resin composition of the present invention; it may be applied once or two or more times.

[0079] Ionizing radiation can be irradiated using conventionally known irradiation methods. For example, the coating can be cured by electron beam irradiation under conditions of 200kV and 3-10Mrad. The light used for light irradiation is ultraviolet or visible light, and this can be irradiated using conventionally known irradiation methods. For example, a high-pressure mercury lamp with a power output of 80-120W / cm² per lamp results in a belt speed of 5-20m / min, and the belt speed can be increased by increasing the number of lamps. The belt speed can also be increased by increasing the power output in W / cm².

[0080] The hardness of the surface protective layer 4 can be evaluated by the pencil hardness of a glass plate coated with the ionizing radiation-curable resin composition used to form the surface protective layer 4 to a thickness of 25 μm and then cured. From the viewpoint of durability, scratch resistance, and impact resistance, a hardness of 6B to 4H is preferred. The pencil hardness is evaluated in accordance with the pencil hardness test (JIS K 5600-5-4).

[0081] The hardness of the surface protective layer 4 is achieved by appropriately designing the crosslinking density of the ionizing radiation-curable resin composition, and it is preferable to set the crosslinking density to one that results in the above-mentioned hardness.

[0082] From the viewpoint of combining slip resistance and stain resistance, the surface roughness of the surface protective layer 4 is preferably as follows: Ra, Ry, and Rpk values ​​are preferred. Ra is preferably 1.85 to 13, more preferably 1.9 to 8, and even more preferably 1.9 to 5. Ry is preferably 9 to 70, more preferably 10 to 50, and even more preferably 10 to 30. Rpk is preferably 2 to 30, more preferably 3 to 20, and even more preferably 3.5 to 12. The surface roughness in this specification is calculated from measurements taken with a surface roughness measuring instrument in accordance with JIS B0601-1994. If the values ​​of Ra, Ry, and Rpk are above the lower limit, stain resistance can be improved, and if they are below the upper limit, there is no discomfort when walking and good slip resistance is achieved.

[0083] The surface protective layer 4 may be embossed to provide anti-slip properties. Embossing is performed to impart a desired uneven shape to the surface of the flooring material 1. For example, after heating and softening the surface protective layer 4, it is pressed and shaped with an embossing plate having the desired uneven shape, and then cooled and fixed to impart texture. Embossing can be performed with a known sheet-fed or rotary embossing machine. The uneven shape of the embossing is not particularly limited and includes, for example, wood grain grooves, raised patterns (raised annual ring patterns), hairline, sand texture, pearlescent texture, and others (not shown) such as regular or irregular arrangements of fixed-shape protrusions, or irregular arrangements of irregular-shape protrusions. However, from the viewpoint of providing anti-slip properties, non-directional patterns such as sand texture or pearlescent texture are preferred because they can uniformly exhibit anti-slip properties in any direction. Furthermore, from the viewpoint of providing anti-slip properties, the depth of the embossing is preferably, for example, 0.01 to 0.5 mm, more preferably 0.05 mm to 0.3 mm, and even more preferably 0.1 mm to 0.2 mm.

[0084] The surface protective layer 4 may be transparent or opaque, but it is preferable that it be transparent enough to allow the design of the flooring material body 2 to be visible.

[0085] The thickness T of the surface protective layer 4 is not particularly limited, but is preferably 5 to 150 μm, more preferably 10 to 70 μm, and even more preferably 15 to 40 μm. In this specification, the thickness of the surface protective layer does not include the thickness of the raised portion due to the anti-slip particles 5, as shown in Figure 4. [Examples]

[0086] [Preparation of ionizing radiation-curable resin compositions] Examples 1-8 An ionizing radiation-curable resin composition was prepared by adding alumina, as described in Tables 4-6, to "UV No. 119LT-DX (manufactured by Chugoku Marine Paints Co., Ltd.)", an ionizing radiation-curable resin containing an ionizing radiation-curable silicone-modified urethane (meth)acrylate resin, in the mass ratios described in Tables 4-6.

[0087] Comparative Example 1 An ionizing radiation-curable urethane (meth)acrylate resin "UV No. 146B (manufactured by Chugoku Marine Paints Co., Ltd.)" that does not contain ionizing radiation-curable silicone-modified urethane (meth)acrylate resin or ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin was used as the ionizing radiation-curable resin composition.

[0088] Reference example 1 An ionizing radiation-curable urethane (meth)acrylate resin "UV No. 118LT (manufactured by Chugoku Marine Paints Co., Ltd.)" that does not contain ionizing radiation-curable silicone-modified urethane (meth)acrylate resin or ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin was used as the ionizing radiation-curable resin composition.

[0089] Comparative Example 2 The preparation was carried out in the same manner as in Example 2, except that alumina was not added.

[0090] Reference example 2 The preparation was carried out in the same manner as in Example 2, except that the ionizing radiation-curable resin "No. 119LT-DX (manufactured by Chugoku Marine Paints Co., Ltd.)", which contains an ionizing radiation-curable silicone-modified urethane (meth)acrylate resin, was replaced with "U1102 (manufactured by Dainichi Seika Co., Ltd.)", which does not contain an ionizing radiation-curable silicone-modified urethane (meth)acrylate resin or an ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin.

[0091] [Flooring material production] Examples 1, 2, 3, 4, 5, 8, Comparative Examples 1, 2, Reference Examples 1, 2 The intermediate floor material excluding the surface protective layer was produced from Composition Table 1 by applying heat and pressure in a known method, and a mirror finish or an emboss was pressed onto the surface of this intermediate floor material. Here, pressing a mirror finish means pressing with a flat plate or roll having a mirror finish, and pressing an emboss means pressing with a plate or roll having unevenness formed thereon. Next, the radiation-curable resin composition prepared as described above was applied onto the surface layer of the intermediate floor material with a uniform thickness by the natural roll coating method, and then immediately irradiated with ultraviolet rays by an electrodeless ultraviolet lamp in air to form a surface protective layer. For Examples 2 to 5 and Comparative Example 2, two types of samples with a mirror finish and an emboss finish were produced, and for Examples 1, 8, Comparative Example 1, and Reference Examples 1 and 2, a mirror finish was used. The basis weight of the glass sheet used in Table 1 was 30 g / m 2 and the air permeability was 299 ml / cm 2 ·sec. The emboss depth in the emboss finish was 0.1 mm. This air permeability is a value measured by stacking three glass sheets.

[0092]

Table 1

[0093] Example 6 A floor material was produced in the same manner as in Example 8, except that the composition was changed to Table 2 instead of Table 1.

[0094]

Table 2

[0095] Example 7 A floor material was produced in the same manner as in Example 8, except that the composition was changed to Table 3 instead of Table 1. The glass sheet used in Table 3 is the same as that used in Table 1.

[0096]

Table 3

[0097] <BHM Test> For each of the flooring materials from Example 1, Comparative Example 1, and Reference Example 1, three rectangular pieces measuring 18cm x 28cm were cut to create three samples. The side of each of these three samples opposite the protective surface layer was attached to the inner wall of a cubic hollow container measuring 52cm x 52cm x 45cm. Six cubic rubber pieces measuring 5cm x 5cm x 5cm were placed inside this hollow container. The container was then rotated clockwise for 15 minutes (rotation speed: 63 revolutions / minute), and then counterclockwise for 15 minutes (rotation speed: 63 revolutions / minute). After the rotation stopped, the samples were removed, their surface condition was visually observed, and photographs were taken. Next, the surface of each sample was wiped with paper while dry and then with paper while wet. The time it took to wipe off the dirt (samples that could not be wiped off within 10 minutes were deemed unusable) and the state of the dirt after wiping were visually observed and photographed. The stain resistance and stain removal properties of the surface after cleaning were evaluated visually according to the following criteria. The results are shown in Table 4. Figure 5 shows the condition of each example immediately after the test and after wiping. ◎: No heel marks are left. ○: Shows heel marks, but can be wiped off quickly with a paper towel or damp cloth. △: Heel marks may appear, but they can be wiped off with paper or water over time. ×: Shoes that leave slight heel marks even after wiping with paper or water.

[0098] [Table 4]

[0099] <Slip resistance> For the flooring materials of Examples 2-5, Comparative Example 2, and Reference Example 2, a sensory evaluation of slipperiness was conducted using various shoes as shown in Table 5. The test results were calculated as the average value from the measurement results of eight individuals based on the following criteria. The results are shown in Table 5. In the table, "dry" refers to the slip resistance in the dry state of the sample, and "water" refers to the slip resistance in the wet state after water has been uniformly sprayed onto the sample surface. 1: Slippery 2: Slightly slippery 3: Slightly slippery 4: Non-slip 5: Non-slip

[0100] [Table 5]

[0101] <Warpage Test> For flooring materials in Examples 6-8, warping was measured using flooring materials of 450mm x 450mm for Examples 6 and 7, and 500mm x 500mm for Example 8. Warping was measured at 5°C, 23°C, and 35°C in accordance with JIS A1454 14. Specifically, the sample was placed surface-up on a polished glass plate and allowed to settle in a constant temperature room (5, 23, 35±2°C, humidity 50±10%) for 24 hours. The sample was then placed on the polished glass plate, and the gap between the four corners of the sample and the glass plate was measured using a magnifying glass with a 1 / 10mm scale. The average value was taken as the warping value. A positive warping value indicates that the ends are warped upward (upward warping value), and a negative value indicates that the ends are warped downward (downward warping value). The results are shown in Table 6.

[0102] [Table 6]

[0103] <Surface roughness> For Examples 2-5, Comparative Example 2, and Reference Example 2, surface roughness was measured using a surface roughness measuring instrument (Surfcom 130A (manufactured by Tokyo Seimitsu Co., Ltd.)) in accordance with JIS B0601-1994 under the following conditions. The values ​​for Ra, Ry, and Rpk were calculated for the longitudinal and transverse directions of the sample, and the average value was calculated. Furthermore, the antifouling and stain removal properties were evaluated using the same criteria as above. The results are shown in Table 7. Note that the antislip evaluation in Table 7 is based on the sandals in Table 5, in a dry state, with values ​​above 3.0 being marked as ◎, 2.5 to 3.0 as ○, and less than 2.5 as ×. Measurement length: 12.5mm Cut-off: 2.5mm Measurement speed: 1.5mm / s Measurement range: ±40μm (some measurements may exceed this range by ±400μm)

[0104] [Table 7]

[0105] From Example 1, Comparative Example 1, and Reference Example 1, it can be seen that when the surface protective layer contains ionizing radiation-curable silicone-modified urethane (meth)acrylate resin, it exhibits excellent antifouling and stain removal properties.

[0106] From experiments 2-5 and comparative example 2, it can be seen that the inclusion of anti-slip particles in the surface protective layer results in superior anti-slip properties.

[0107] While a moderate negative value for the warping of the flooring material is preferable, comparing Examples 6 to 8, Example 8, which included two glass sheets in the flooring material itself, was particularly preferable.

[0108] Table 7 shows that Examples 2-5, which satisfy the ranges of Ra (1.85-13), Ry (9-70), and Rpk (2-30), exhibit a good balance between antifouling, stain removal, and antislip properties. Of these, Example 3 was particularly preferred.

[0109] The present invention is not limited in any way by the embodiments and examples described above. Various embodiments can be taken without departing from the spirit of the present invention. [Explanation of symbols]

[0110] 1. Flooring 2. Flooring material itself 21 Base material layer 22 Resin layer 221 1st resin layer 222 2nd resin layer 223 Third resin layer 23 Shape stabilizing layer 231 1st shape stabilization layer 232 Second shape stabilizing layer 24 Makeup layer 3 Surface layer 4 Surface protective layer 5 Anti-slip particles 5a Covering part T: Thickness of the surface protective layer

Claims

1. A flooring material comprising a flooring material body having a resin layer and a surface protective layer formed by an ionizing radiation-curable resin composition applied to the flooring material body, wherein the flooring material body has enough flexibility to be wound onto a roll when formed into a long strip, the surface protective layer contains a cured product of the ionizing radiation-curable resin composition, the ionizing radiation-curable resin composition contains at least one selected from ionizing radiation-curable silicone-modified urethane (meth)acrylate resin and ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin, and the surface roughness Ry of the surface protective layer is 10 or more and less than 50, and the flooring material is formed into a long strip or a single leaf.

2. The flooring material according to claim 1, wherein the surface protective layer further comprises anti-slip particles.

3. The flooring material according to claim 1 or 2, wherein the flooring material body further comprises at least one layer selected from a base layer, a shape-stabilizing layer, a decorative layer, and a surface layer.

4. A method for manufacturing a flooring material comprising a flooring material body having a resin layer and a surface protective layer comprising a cured product of an ionizing radiation-curable resin composition containing at least one selected from ionizing radiation-curable silicone-modified urethane (meth)acrylate resin and ionizing radiation-curable fluorine-modified urethane (meth)acrylate resin, and having a surface roughness Ry of 10 or more and less than 50, the method comprising the steps of manufacturing the flooring material body, applying the ionizing radiation-curable resin composition onto the flooring material body, and forming the flooring material into a long strip or a single leaf, wherein the flooring material body has enough flexibility to be wound onto a roll when formed into a long strip.

5. The manufacturing method according to claim 4, wherein the surface protective layer further comprises anti-slip particles.

6. The manufacturing method according to claim 4 or 5, wherein the floor material body further comprises at least one layer selected from a base layer, a shape stabilizing layer, a decorative layer, and a surface layer.

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