JP4840461B2 - Decorative sheet for flooring - Google Patents

Description

  The present invention relates to a decorative sheet for flooring.

  The decorative sheet for flooring is used for the purpose of decorating the surface of the base material by sticking it to a base material (for example, a wooden base material such as plywood) disposed on the floor surface. Such a decorative sheet for flooring is required to have excellent properties such as impact resistance in addition to the decorative performance.

  As a decorative sheet for flooring, for example, a decorative layer is provided on a base material sheet, and a thermoplastic resin layer (synthetic resin backer layer) is further provided on the back surface of the base material sheet. A decorative sheet for flooring that exhibits properties such as properties is known (Patent Documents 1-4). Note that the backer layer is a synthetic resin layer having a relatively large thickness, which is effective for the expression of the above-mentioned characteristics while mitigating the influence of surface irregularities such as a wooden substrate.

  In the production of a decorative sheet for flooring, if the number of manufacturing processes increases, naturally the production cost and loss increase accordingly, and therefore the number of manufacturing processes is required to be reduced.

  Therefore, it is desired to develop a decorative sheet for flooring that can obtain the same properties without using a backer layer and has a small number of manufacturing steps.

JP 2004-84285 A JP 2004-143700 A JP 2006-218784 A JP 2007-98855 A

  An object of the present invention is to provide a decorative sheet for flooring that has excellent characteristics such as impact resistance without using a backer layer.

  As a result of intensive studies to achieve the above object, the present inventor has made the thickness of the hard film (base sheet) 100 to 500 μm and the tensile elastic modulus measured in accordance with JIS K6734 is 1000 MPa or more. In some cases, the inventors have found that the above object can be achieved and have completed the present invention.

That is, the present invention relates to the following decorative sheet for flooring.
Item 1. A decorative sheet for flooring having a pattern layer and a surface protective layer in order on a hard film having a thickness of at least 100 to 500 μm, and the tensile modulus of the hard film measured in accordance with JIS K6734 is 1000 MPa or more. A decorative sheet for flooring.
Item 2. Item 2. The decorative sheet for flooring according to Item 1, wherein the hard film contains a polyolefin-based resin or a polyester-based resin as a resin component.
Item 3. Item 3. The decorative sheet for flooring according to Item 1 or 2, wherein the surface protective layer contains an ionizing radiation curable resin as a resin component.
Item 4. Item 4. The decorative sheet for flooring according to any one of Items 1 to 3, further comprising a transparent adhesive and a transparent resin layer in order between the pattern layer and the surface protective layer.
Item 5. Item 5. A flooring decorative material obtained by laminating the decorative material for flooring according to any one of Items 1 to 4 and an adherend.

  Hereinafter, the decorative sheet for flooring and the decorative material for flooring of the present invention will be described.

The decorative sheet for flooring The decorative sheet for flooring of the present invention has a pattern layer and a surface protective layer laminated in order on a hard film having a thickness of at least 100 to 500 μm, and measured according to the provisions of JIS K6734 for hard films. The tensile elastic modulus is 1000 MPa or more.

  The decorative sheet for flooring of the present invention having the above characteristics does not have a backer layer, but has characteristics such as impact resistance comparable to that of a decorative sheet having a backer layer. In addition, in the production of the decorative sheet for flooring of the present invention, the process of laminating the backer layer is not necessary, so that the production cost and loss can be suppressed.

  Hereinafter, each layer of the decorative sheet for flooring and the decorative material for flooring of the present invention will be described.

(Hard film)
The hard film (hereinafter also referred to as “base sheet”) has a thickness of 100 to 500 μm and a tensile elastic modulus of 1000 MPa or more.

  The tensile modulus of the hard film is 1000 MPa or more, preferably 1400 MPa or more. When the pressure is less than 1000 MPa, physical properties such as an impact test as a flooring material are insufficient. If the tensile modulus is 1400 MPa or more, the scratch resistance can be further improved. In addition, the tensile elastic modulus in this specification refers to the tensile elastic modulus of a sample (for example, here, a hard film) according to JIS K6734 “Plastic—Hard Polyvinyl Chloride Sheet—Dimensions and Characteristics—Part 2: Sheet with a thickness less than 1 mm. It is a value measured according to the definition of "." The JIS (Japanese Industrial Standards) refers to Japanese Industrial Standards. Specifically, when both ends (A and B in FIG. 1) of the sample punched into the shape shown in FIG. 1 are pulled at a speed of 50 mm / min using a tensile tester (Tensilon universal tester RTC-1250A). Further, it is a value obtained by reading the tensile elastic modulus (MPa) when the sample is cut at the central portion.

  The resin constituting the hard film only needs to have a tensile modulus of 1000 MPa or more. Examples of such resins include PET-G, homopolypropylene, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate. Examples thereof include phthalate, polybutylene naphthalate, polystyrene, ABS, polyarylate, polycarbonate, methacrylic resin, polyethylene, random polypropylene, and polyamide. Among these, polyolefin resin or polyester resin is particularly preferable.

  The thickness of the hard film is 100 to 500 μm, preferably 100 to 450 μm. When the thickness is less than 100 μm, physical properties such as an impact test as a flooring material are insufficient, and when it is larger than 500 μm, the sheet cannot be rolled because it is too thick.

  Although it is not limited whether the hard film is colored, the case where it is colored is more preferable. When it is laminated with an adherend and groove processing is performed from the surface side to reach the hard film, the coating effect can be imparted without applying groove coating due to the coloring effect of the hard film.

  The hard film is colored by adding a coloring material (pigment or dye) or the like. It does not specifically limit as a coloring agent, Well-known coloring agents, such as a pigment and dye, can be used. For example, titanium white, zinc white, petal, vermilion, ultramarine blue, cobalt blue, titanium yellow, yellow lead, carbon black and other inorganic pigments; isoindolinone, Hansa Yellow A, quinacridone, permanent red 4R, phthalocyanine blue, indanthrene Organic pigments (including dyes) such as blue RS and aniline black; metal pigments such as aluminum and brass; pearlescent pigments made of foil powder such as titanium dioxide-coated mica and basic lead carbonate. The coloring mode of the hard film includes transparent coloring and opaque coloring (hiding coloring), and these can be arbitrarily selected. For example, when the ground color of an adherend (a base material on which a decorative sheet is pasted, such as a wooden base material) is concealed, opaque coloring may be selected. On the other hand, in order to make the ground pattern of the adherend visible, transparent coloring may be selected.

  An additive may be mix | blended with a hard film as needed. Examples of the additive include a filler such as calcium carbonate and clay, a flame retardant such as magnesium hydroxide, an antioxidant, a weathering agent, a lubricant, and a foaming agent. The blending amount of the additive can be appropriately set according to the product characteristics.

  One or both surfaces of the hard film may be subjected to surface treatment such as corona discharge treatment, ozone treatment, plasma treatment, ionizing radiation treatment, dichromic acid treatment, etc., as necessary. For example, when performing corona discharge treatment, the surface tension of the hard film surface may be 30 dyne or more, preferably 40 dyne or more. The surface treatment may be performed according to a conventional method for each treatment.

  On one or both sides of the hard film, a primer layer (for example, a back primer layer for facilitating adhesion of the adherend or a primer layer for facilitating the formation of a pattern layer) is provided as necessary. May be.

  A primer layer can be formed by apply | coating a well-known primer agent to the single side | surface or both surfaces of a hard film. As the primer agent, for example, a urethane resin primer agent made of acrylic modified urethane resin or the like, a primer agent made of urethane-cellulose resin (for example, a resin made by adding hexamethylene diisocyanate to a mixture of urethane and nitrified cotton), Examples thereof include a primer agent made of an acrylic-urethane resin.

Although the application amount of the primer agent is not particularly limited, it is usually 0.1 to 100 g / m ² , preferably about 0.1 to 50 g / m ² .

  Although the thickness of a primer layer is not specifically limited, Usually, 0.01-10 micrometers, Preferably it is about 0.1-1 micrometer.

(Pattern layer (Pattern layer))
A pattern layer is formed on the hard film.

  The design pattern layer imparts design properties with a desired design to the decorative sheet, and the type of design is not particularly limited. Examples thereof include a wood grain pattern, a stone pattern, a grain pattern, a tiled pattern, a brickwork pattern, a cloth pattern, a leather pattern, a geometric figure, a character, a symbol, and an abstract pattern.

  The method for forming the pattern layer is not particularly limited. For example, a colored ink or coating obtained by dissolving (or dispersing) a known colorant (dye or pigment) in a solvent (or dispersion medium) together with a binder resin. What is necessary is just to form by the printing method etc. which used the agent etc.

  Examples of the colorant include inorganic pigments such as carbon black, titanium white, zinc white, dial, bitumen, and cadmium red; azo pigments, lake pigments, anthraquinone pigments, quinacridone pigments, phthalocyanine pigments, isoindolinone pigments, dioxazine pigments. Organic pigments such as aluminum powder, metal powder pigments such as bronze powder, pearlescent pigments such as titanium oxide-coated mica and bismuth oxide chloride; fluorescent pigments; These colorants can be used alone or in admixture of two or more. These colorants may further contain fillers such as silica, extender pigments such as organic beads, neutralizing agents, surfactants and the like.

  Examples of the binder resin include acrylic resin, styrene resin, polyester resin, urethane resin, chlorinated polyolefin resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl butyral resin, alkyd resin, petroleum Resin, ketone resin, epoxy resin, melamine resin, fluorine resin, silicone resin, fiber derivative, rubber resin, acrylic-urethane resin and the like. These resins can be used alone or in admixture of two or more.

  Examples of the solvent (or dispersion medium) include petroleum organic solvents such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane, and methylcyclohexane; ethyl acetate, butyl acetate, 2-methoxyethyl acetate, and acetic acid-2 -Ester-based organic solvents such as ethoxyethyl; alcohol-based organic solvents such as methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol, propylene glycol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone Organic solvents; ether organic solvents such as diethyl ether, dioxane, tetrahydrofuran; dichloromethane, carbon tetrachloride, trichloroethylene, tetrachloroethylene Inorganic solvents and the like, such as water; chlorinated organic solvents. These solvents (or dispersion media) can be used alone or in admixture of two or more.

  Examples of the printing method used for forming the pattern layer include a gravure printing method, an offset printing method, a screen printing method, a flexographic printing method, an electrostatic printing method, and an inkjet printing method. When forming a solid pattern pattern layer, for example, roll coating method, knife coating method, air knife coating method, die coating method, lip coating method, comma coating method, kiss coating method, flow coating method, dip coating Various coating methods such as a coating method may be mentioned. In addition, the hand-drawn method, the ink-sink method, the photographic method, the transfer method, the laser beam drawing method, the electron beam drawing method, the metal partial evaporation method, the etching method, etc. may be used or combined with other forming methods. Good.

  The thickness of the pattern layer is not particularly limited and can be set as appropriate according to product characteristics. The layer thickness at the time of coating is about 1 to 15 μm, and the layer thickness after drying is about 0.1 to 10 μm.

(Colored hiding layer)
A colored concealment layer may be further formed between the hard film and the pattern layer as necessary. The colored masking layer is provided when it is desired to mask the ground color of the adherend from the front surface of the decorative sheet. Of course, when the base sheet is transparent, even when the hard film is concealed and colored, it may be formed in order to stabilize the concealment.

  As the ink for forming the colored masking layer, an ink for forming a pattern layer and capable of masking coloring can be used.

  The method for forming the colored concealment layer is preferably a method that can be formed so as to cover the entire base sheet (entirely solid). For example, the roll coating method, knife coating method, air knife coating method, die coating method, lip coating method, comma coating method, kiss coating method, flow coating method, gravure coating method, gravure reverse coating method, dip coating method and the like described above are preferable. It is mentioned as a thing.

  The thickness of the colored concealing layer is not particularly limited and can be set as appropriate according to the product characteristics. The layer thickness during coating is about 0.2 to 10 μm, and the layer thickness after drying is about 0.1 to 5 μm.

(Transparent adhesive layer)
When providing the transparent resin layer mentioned later, it is preferable to provide a transparent adhesive layer on a picture pattern layer. The transparent adhesive layer is not particularly limited as long as it is transparent, and includes any of transparent and colorless, colored and translucent. The transparent adhesive layer is formed in order to bond the pattern layer and the transparent resin layer. It does not specifically limit as an adhesive agent, A well-known adhesive agent can be used in the field of a decorative sheet.

  Examples of the adhesive known in the field of decorative sheets include thermoplastic resins such as polyamide resin, acrylic resin and vinyl acetate resin, and curable resins such as thermosetting urethane resin. Further, a two-component curable polyurethane resin or polyester resin using isocyanate as a curing agent can also be applied.

  The adhesive layer can be formed, for example, by applying an adhesive on the pattern layer, applying a coating agent (adhesive) that constitutes the transparent resin layer, and drying and curing. Conditions such as drying temperature and drying time are not particularly limited, and may be set as appropriate according to the type of adhesive. The method of applying the adhesive is not particularly limited, and examples thereof include roll coating, curtain flow coating, wire bar coating, reverse coating, gravure coating, gravure reverse coating, air knife coating, kiss coating, blade coating, smooth coating, and comma coating. The method can be adopted.

  Although the thickness of an adhesive bond layer is not specifically limited, The thickness after drying is 0.1-30 micrometers, Preferably it is about 1-20 micrometers.

(Transparent resin layer)
A transparent resin layer may be preferably formed on the transparent adhesive layer between the pattern layer and the surface protective layer. The transparent resin layer includes any of colorless and transparent, colored and transparent, and translucent as long as it is transparent.

  The resin component contained in the transparent resin layer is not limited, but is preferably a thermoplastic resin, particularly preferably polypropylene, and more preferably homopolypropylene. It is preferable that the transparent resin layer is substantially formed of the polypropylene resin.

  The transparent resin layer is formed, for example, from the above polypropylene resin by a calendar method, an inflation method, a T-die extrusion method, or the like. An existing film may be used.

  The transparent resin layer may contain a weathering agent as necessary. As the weathering agent, for example, an ultraviolet absorber, a hindered amine light stabilizer and the like are preferable. These weathering agents can be used alone or in admixture of two or more. In particular, when the transparent resin layer contains polypropylene, it is preferable to contain a weathering agent.

  Examples of the ultraviolet absorber include benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, and triazine ultraviolet absorbers. As the light stabilizer, for example, a hindered amine light stabilizer is suitable. The content of these weathering agents is not limited, but both the ultraviolet absorber and the light stabilizer may be about 1000 to 10,000 ppm by weight in the transparent resin layer.

  The thickness of the transparent resin layer is not particularly limited, but is generally about 10 to 150 μm.

  The surface of the transparent resin layer on which the surface protective layer to be described later is formed is subjected to surface treatment such as corona discharge treatment, ozone treatment, plasma treatment, ionizing radiation treatment, dichromic acid treatment as necessary. You may give it. The surface treatment may be performed according to a conventional method for each treatment.

  Moreover, you may provide a primer layer (primer layer for making formation of a surface protective layer easy) on the surface as needed.

  The primer layer can be formed by applying a known primer agent. Examples of the primer agent include a urethane resin-based primer agent made of an acrylic-modified urethane resin or the like, a resin-based primer agent made of a block copolymer of acrylic and urethane, a primer agent made of an acrylic-urethane resin, and the like.

Although the application amount of the primer agent is not particularly limited, it is usually 0.1 to 100 g / m ² , preferably about 0.1 to 50 g / m ² .

  Although the thickness of a primer layer is not specifically limited, Usually, 0.01-10 micrometers, Preferably it is about 0.1-1 micrometer.

(Surface protective layer)
A surface protective layer is formed on the design pattern layer (transparent resin layer). The surface protective layer is not limited, but is preferably transparent to such an extent that the pattern can be visually recognized, and preferably contains an ionizing radiation curable resin or a two-component curable urethane resin as a resin component, and particularly ionizing radiation curable. It is preferable to contain a mold resin. Substantially those formed from these resins are preferred. When the surface protective layer is formed of an ionizing radiation curable resin or a two-component curable urethane resin, it is easy to improve the abrasion resistance, impact resistance, contamination resistance, scratch resistance, weather resistance, etc. of the decorative sheet.

  The ionizing radiation curable resin is not particularly limited, and prepolymers (including oligomers) and / or monomers containing radically polymerizable double bonds capable of undergoing a crosslinking reaction upon irradiation with ionizing radiation such as ultraviolet rays and electron beams. A transparent resin containing as a main component can be used. These prepolymers or monomers can be used alone or in combination. The curing reaction is usually a cross-linking curing reaction.

  Specifically, as the prepolymer or monomer, a compound having in the molecule a radically polymerizable unsaturated group such as a (meth) acryloyl group or (meth) acryloyloxy group, or a cationically polymerizable functional group such as an epoxy group. Is mentioned. Further, a polyene / thiol prepolymer based on a combination of polyene and polythiol is also preferable. Here, the (meth) acryloyl group means an acryloyl group or a methacryloyl group.

  Examples of the prepolymer having a radically polymerizable unsaturated group include polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, triazine (meth) acrylate, and silicone (meth) acrylate. Etc. These molecular weights are usually preferably about 250 to 100,000.

  As a monomer which has a radically polymerizable unsaturated group, methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, phenoxyethyl (meth) acrylate etc. are mentioned as a monofunctional monomer, for example. Examples of the polyfunctional monomer include diethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane ethylene oxide tri (meth) acrylate, dipentaerythritol tetra ( And (meth) acrylate, dipentaerythritol penta (meth) acrylate, and dipentaerythritol hexa (meth) acrylate.

  Examples of the prepolymer having a cationic polymerizable functional group include prepolymers of epoxy resins such as bisphenol type epoxy resins and novolac type epoxy compounds, and vinyl ether type resins such as fatty acid type vinyl ethers and aromatic vinyl ethers. Examples of the thiol include polythiols such as trimethylolpropane trithioglycolate and pentaerythritol tetrathioglycolate. Examples of the polyene include those in which allyl alcohol is added to both ends of polyurethane by diol and diisocyanate.

  As the ionizing radiation used for curing the ionizing radiation curable resin, electromagnetic waves or charged particles having energy capable of causing a curing reaction of molecules in the ionizing radiation curable resin (composition) are used. Usually, ultraviolet rays or electron beams may be used, but visible light, X-rays, ion rays, or the like may be used.

  As the ultraviolet light source, for example, a light source such as an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light, a metal halide lamp can be used. As a wavelength of ultraviolet rays, 190 to 380 nm is usually preferable.

  As the electron beam source, various electron beam accelerators such as a cockcroft Walton type, a bandegraft type, a resonant transformer type, an insulating core transformer type, a linear type, a dynamitron type, and a high frequency type can be used. Among them, those capable of irradiating electrons having energy of 100 to 1000 keV, preferably 100 to 300 keV are preferable.

  The two-component curable urethane resin is not particularly limited. Among them, a polyol component (acrylic polyol, polyester polyol, polyether polyol, epoxy polyol, etc.) having an OH group as a main component and an isocyanate component (tolylene diene) which is a curing agent component. Isocyanate, hexamethylene diisocyanate, metaxylene diisocyanate and the like) can be used.

  The surface protective layer may contain an anti-glare agent, a plasticizer, a stabilizer, a filler, a dispersant, a colorant such as a dye and a pigment, a solvent, and the like, if necessary. About the kind in case of containing a weathering agent and content, it is the same as that of the description in a transparent resin layer.

  The surface protective layer is formed by, for example, applying an ionizing radiation curable resin or a two-component curable urethane resin on a transparent polypropylene resin layer by a known coating method such as gravure coating or roll coating, and then curing the resin. Can be formed. In the case of an ionizing radiation curable resin, the resin is cured by electron beam irradiation.

  The thickness of the surface protective layer is not particularly limited and can be appropriately set according to the characteristics of the final product, but is usually about 0.1 to 50 μm, preferably about 1 to 20 μm.

  Irregularities may be formed on the front surface (surface exposed to the atmosphere) of the surface protective layer. Usually, an uneven pattern is formed by embossing. The embossing method is not particularly limited. For example, a preferable method is to heat soften the front surface of the transparent acrylic resin layer, pressurize and shape with an embossing plate, and then cool. For embossing, a known single-wafer or rotary embossing machine is used. Examples of the concavo-convex shape include a wood grain plate conduit groove, a stone plate surface unevenness (such as granite cleaved surface), a cloth surface texture, a satin texture, a grain, a hairline, a ridge line, and the like.

Flooring decorative material The flooring decorative sheet of the present invention can be made into a flooring decorative material by bonding with various adherends. The material of the adherend is not particularly limited, and examples thereof include inorganic non-metallic materials, metallic materials, wood materials, and plastic materials.

  Specifically, in inorganic non-metallic systems, for example, papermaking cement, extruded cement, slag cement, ALC (lightweight cellular concrete), GRC (glass fiber reinforced concrete), pulp cement, wood chip cement, asbestos cement, calcium oxalate, Non-ceramic ceramic materials such as gypsum and gypsum slag, ceramic materials such as earthenware, ceramics, porcelain, setware, glass, and glazing.

  In a metal system, metal materials (metal steel plate), such as iron, aluminum, and copper, are mentioned, for example.

  In the wood system, for example, a single board, plywood, particle board, fiber board, laminated timber and the like made of cedar, straw, firewood, lauan, teak and the like can be mentioned.

  In the plastic system, for example, resin materials such as polypropylene, ABS resin, and phenol resin can be used.

  The shape of such an adherend is not particularly limited, and may be a flat plate in consideration of installation on a flooring or the like.

  After joining with the adherend, for example, according to the characteristics of the final product, cutting, use of a tenor, sag processing, provision of V-shaped grooves, chamfering on four sides, etc. may be performed.

  Although the decorative sheet for flooring of the present invention does not have a backer layer, it has excellent impact resistance and can be rolled. Moreover, since there is no manufacturing process of a backer layer, production cost and loss can be reduced.

It is a schematic diagram (top view) which shows the shape of a sample in the case of measuring the tensile elasticity modulus of a sample according to prescription | regulation of JISK6734. In the figure, R60 indicates the degree of curvature.

  Hereinafter, the present invention will be described in more detail with reference to examples.

Examples 1-9 and Comparative Examples 1-3
(Preparation of decorative sheet for flooring)
(1) A base sheet was prepared according to Table 1 below.
(2) A primer layer for printing was formed on a base sheet by gravure printing with an acrylic-urethane resin solution.
(3) A 4 μm wood grain pattern layer was formed on the printing primer layer by a gravure printing method using an acrylic-urethane resin solution as a printing ink.
(4) A urethane-cellulose resin solution was applied to the surface of the substrate sheet opposite to the pattern layer by a gravure printing method so that the solid content was 2 g / m ² to form a primer.
(5) On the pattern layer, a urethane resin adhesive was applied so that the solid content was 8 g / m ² to form a transparent adhesive layer.
(6) A polypropylene resin was heated and melt extruded by a T-die extruder to form a transparent resin layer made of polypropylene having a thickness of 80 μm.
(7) After the corona discharge treatment is applied to the surface of the transparent resin layer, an acrylic-urethane resin solution is applied to the corona discharge treatment surface by a gravure printing method so that the solid content becomes 1 g / m ^2. A primer layer for forming a protective layer was formed.
(8) On the primer layer for forming the surface protective layer, a urethane acrylate electron beam curable resin is applied and dried so as to have a solid content of 15 g / m ² by a roll coating method, and then uncured electron beam curing. A mold resin layer was formed. Thereafter, in an environment with an oxygen concentration of 200 ppm, an uncured resin layer is irradiated with an electron beam under conditions of an acceleration voltage of 125 KeV and 5 Mrad to cure the resin, thereby forming an electron beam curable resin layer (surface protective layer) having a thickness of 15 μm. did.
(9) From the top of the surface protective layer 1, an embossed embossing process was used to form a grained pipe-like uneven pattern with a depth of 50 μm.

(Preparation of decorative materials for floors)
A 12 mm lauan plywood was attached to the base sheet side of the decorative sheet for flooring to produce a decorative material for flooring. For the sticking, urethane-modified ethylene / vinyl acetate emulsion adhesive (100 g / m ² wet) was used.

  The following evaluation was performed about the obtained decorative sheet for flooring and the decorative material for flooring, and the obtained result is shown in Table 1.

(DuPont impact test)
The impact resistance of the produced floor decorative material was evaluated using a DuPont impact tester (based on JIS K5600-5-3). Specifically, evaluation was performed by dropping a weight having a specified weight from a height of 30 cm onto the surface of the decorative material and measuring the amount of dents. The criterion was that the color floor with a veneer (approx. 0.25 mm) on a plywood (approx. 11.8 mm) and UV coating (0.01 mm) on it was 500-600 μm. A dent amount of 500 μm or less was evaluated as “◯”, a value larger than 500 μm and less than 600 μm as “Δ”, and a value as 600 μm or more as “×”.

(Rolling test)
It was investigated whether the produced decorative sheet for flooring could be wound. In the case of roll, the case where no winding deviation occurred was marked as “O”, and the case where the winding deviation occurred was marked as “X” as unrollable.

(Pencil hardness test)
The scratch resistance performance of the produced floor decorative material was evaluated using a pencil hardness tester. The test was performed in accordance with JIS K5600-5-4 except that the test machine was set so as to apply a load of 1000 g to the tip of the pencil when the test machine was in the horizontal position. The criterion was that the load on which a general color floor dent was generated was 4B. The case where the hardness at which the dent was generated was smaller than 4B, the case where it was 4B, Δ, and the case where it was larger than 4B, ×.

(Discussion)
From Table 1, when the thickness of the base material sheet is 100 to 500 μm and the tensile elastic modulus is 1000 MPa or more, a decorative sheet for flooring that does not use a backer layer is desired in terms of impact resistance and rollability. It can be seen that the following characteristics can be obtained. It can also be seen that if the tensile modulus is 1400 MPa or more, the scratch resistance can be further improved.

Claims (7)

A decorative sheet for flooring having a pattern layer and a surface protective layer in order on a hard film having a thickness of at least 100 to 500 μm, and the tensile modulus of the hard film measured according to JIS K6734 is 1600 to 2000 MPa There is a DuPont impact tester (based on JIS K5600-5-3, specified from a height of 30 cm) for flooring materials in which a 12 mm lauan plywood is attached to the hard film side of the flooring decorative sheet A decorative sheet for flooring having a dent amount of less than 600 μm evaluated by dropping a weight of weight onto the surface of the decorative material .   The decorative sheet for flooring according to claim 1, wherein the dent amount evaluated using a DuPont impact tester (based on JIS K5600-5-3) is 500 µm or less.   The decorative sheet for flooring according to claim 1 or 2, wherein the hard film contains a polyolefin resin or a polyester resin as a resin component.   The said surface protective layer is a decorative sheet for flooring materials as described in any one of Claims 1-3 containing ionizing radiation curable resin as a resin component.   The decorative sheet for flooring according to any one of claims 1 to 4, wherein a transparent adhesive and a transparent resin layer are sequentially provided between the pattern pattern layer and the surface protective layer.   The decorative sheet for flooring according to any one of claims 1 to 5, wherein the hard film is colored.   A floor decorative material obtained by laminating the decorative sheet for flooring according to any one of claims 1 to 6 and an adherend.

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