JP5978681B2 - Floor decorative sheet and floor decorative material - Google Patents

Description

  The present invention relates to a floor decorative sheet and a floor decorative material.

  Conventionally, as a flooring material for a detached house or an apartment / apartment, for example, a veneer obtained by slicing natural wood having a thickness of several hundreds μm to several mm on a wooden board such as a lauan plywood having a thickness of about 6 to 15 mm is used. Bonding and further coating the surface of the veneer are widely used. Such a flooring material coated with natural wood can be smoothly finished with a depth by repeating painting, polishing, and painting, and a beautiful design with a feeling of painting can be obtained.

  However, today, it is difficult to stably mass-produce floor materials using natural wood from the viewpoint of lack of wood resources worldwide.

  In view of these problems, for example, flooring materials have been proposed in which a decorative sheet having an appearance close to that of natural wood is printed on an adherend by printing a wood grain pattern or the like (Patent Documents 1, 2, etc.). Floor materials using such a decorative sheet can be stably mass-produced.

  However, a flooring material in which a decorative sheet is laminated on an adherend often loses the natural walking feeling and warmth of natural wood, and is unique to natural wood when walking on the flooring material. There is a problem that sufficient comfort cannot be obtained.

  Therefore, a floor decorative material in which a decorative sheet is laminated on an adherend, which is a floor decorative material that provides the natural walking feeling and warmth of natural wood, and a floor cosmetic for producing the same. Development of seats is desired.

JP 2006-97321 A JP 2010-106654 A

  The present invention relates to a floor decorative material in which a decorative sheet is laminated on an adherend, and is a floor decorative material that can provide a natural walking feeling and warmth of natural wood, and a floor for producing the same. An object is to provide a decorative sheet.

  As a result of intensive studies to achieve the above object, the present inventor has found that the above object can be achieved according to the decorative sheet for floors having a specific layer configuration and a pressure restoration rate, and completes the present invention. It came to.

That is, the present invention relates to the following floor decorative sheet and floor decorative material.
1. On the base sheet, a floor decorative sheet having at least a transparent resin layer and a transparent surface protective layer in order,
(1) The front surface of the decorative sheet for floor has an uneven pattern with an average roughness Rz of 60 to 140 μm ,
(2) On the back surface of the base sheet, there is a resin foam layer ,
(3) The floor decorative sheet has a thickness recovery rate of 40% or more when the pressure is released after pressing for 24 hours with a load of 30 N / cm ² , and the thickness loss is 1 mm or less. is there,
This is a decorative sheet for floors.
2. Item 2. The floor decorative sheet according to Item 1, wherein the resin foam layer has a thickness of 1 to 2 mm.
3. Item 3. The floor decorative sheet according to Item 1 or 2, wherein the resin foam layer is colored.
4). The floor decorative sheet according to any one of Items 1 to 3, wherein the transparent surface protective layer contains at least one of an ionizing radiation curable resin and a two-component curable urethane-based resin.
5. Item 5. The decorative sheet for floor according to any one of Items 1 to 4, further comprising a pattern layer, a transparent adhesive layer, a transparent resin layer, and a transparent surface protective layer in this order on the substrate sheet.
6). A floor decorative material comprising the floor decorative sheet according to any one of Items 1 to 5 on an adherend.

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

The decorative sheet for floors The decorative sheet for floors of the present invention has at least a transparent resin layer and a transparent surface protective layer in order on the base sheet,
(1) An uneven pattern having an average roughness Rz of 60 μm or more is formed on the front surface of the floor decorative sheet,
(2) A resin foam layer is formed on the back surface of the base sheet,
(3) The floor decorative sheet has a thickness recovery rate of 40% or more when the pressure is released after pressing for 24 hours with a load of 30 N / cm ² , and the thickness loss is 1 mm or less. is there,
It is characterized by that.

  The floor decorative sheet of the present invention can be used as a floor decorative material by being laminated on an adherend. And since the resin foam layer is formed and the decorative sheet for flooring has a specific pressure restoring rate, the original walking feeling of the wood that natural wood has is obtained. Furthermore, the original warmth of the natural wood is obtained by forming an uneven pattern with an average roughness Rz of 60 μm or more on the front surface. As a result, the comfort unique to natural wood is obtained.

  As a layer structure of the decorative sheet for floors, it has at least a transparent resin layer and a transparent surface protective layer in order on the base sheet, has a resin foam layer on the back surface of the base sheet, and has predetermined irregularities. Although it is not particularly limited as long as it has a pattern and a pressure restoration rate, for example, it has a pattern layer, a transparent adhesive layer, a transparent resin layer, and a transparent surface protective layer in this order on the substrate sheet, and the back surface of the substrate sheet A layer structure having a resin foam layer and a predetermined uneven pattern is suitable. Hereinafter, the layer configuration of the decorative sheet for floor will be exemplarily described.

(Substrate sheet)
Although it does not limit as a base material sheet, the base material sheet which contains polyolefin resin as a resin component is preferable. Essentially, a sheet made of polyolefin resin is used.

  It does not specifically limit as polyolefin resin, What is normally used in the field | area of a decorative sheet can be used. For example, polyethylene, polypropylene, polybutene, polymethylpentene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-propylene-butene copolymer, polyolefin-based thermoplastic elastomer, etc. Is mentioned. Among these, polypropylene, polyolefin-based thermoplastic elastomers and the like are particularly preferable.

  A homopolymer or copolymer having polypropylene as a main component is also preferable, for example, a homopolypropylene resin, a random polypropylene resin, a block polypropylene resin, and a polypropylene crystal part and having 2 to 20 carbon atoms other than propylene. -Olefins. In addition, a propylene-α-olefin copolymer containing 15 mol% or more of a comonomer of ethylene, butene-1,4-methylpentene-1, hexene-1, or octene-1 is also preferable.

  The polyolefin-based thermoplastic elastomer is preferably a mixture of isotactic polypropylene in the hard segment and atactic polypropylene in the soft segment in a weight ratio of 80:20.

  The polyolefin resin may be formed into a film by, for example, a calendar method, an inflation method, a T-die extrusion method, or the like.

  The thickness of the substrate sheet is not particularly limited and can be set according to product characteristics, but is usually 50 to 250 μm, preferably about 50 to 100 μm.

  An additive may be mix | blended with a base material sheet 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 lubricant, a foaming agent, and a colorant (see below). The blending amount of the additive can be appropriately set according to the product characteristics.

  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 base sheet includes transparent coloring and opaque coloring (hiding coloring), and these can be arbitrarily selected. For example, when the ground color of the wooden board is concealed, opaque coloring may be selected. On the other hand, in order to make the ground pattern of the wooden board visible, transparent coloring may be selected.

  One or both surfaces of the base sheet 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 the corona discharge treatment is performed, the surface tension of the substrate sheet 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 base sheet, a primer layer (for example, a back primer layer for facilitating adhesion of a resin foam layer, a primer layer for facilitating the formation of a pattern layer) as necessary. May be provided.

  A primer layer can be formed by apply | coating a well-known primer agent to the single side | surface or both surfaces of a base material sheet. Examples of the primer agent include a urethane resin primer agent made of acrylic modified urethane resin, 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), and the like. Is mentioned.

  Although the thickness of a primer layer is not specifically limited, Usually, 0.1-10 micrometers, Preferably it is about 1-5 micrometers.

(Resin foam layer)
A resin foam layer is formed on the back surface of the base sheet.

  As a method for forming the resin foam layer, a conventionally known resin foam technique can be employed. For example, (1) a method of impregnating a thermoplastic resin pellet or bead with a gas, heating and melting with an extruder, and foam-molding when leaving the die, and (2) a thermoplastic resin pellet or bead with an extruder. A method of heating and melting, injecting and kneading gas into the mold, and foaming when the die exits. (3) A pellet or bead of thermoplastic resin containing a foaming agent is heated and melted with an extruder, and the die (4) Chemical foaming agent that generates gas by decomposing at thermoplastic resin pellets and molding temperature by obtaining unfoamed sheet at the time of exiting and foaming and crosslinking by heating or electron beam irradiation in post-processing Are mixed, heated and melted with an extruder, and foamed when exiting the die.

  Examples of the foaming agent include thermal decomposition types such as azodicarbonamide, azobisisobutyronitrile, NN′-dinitrosopentamethylenetetramine, oxybisbenzenesulfonylhydrazide, sodium hydrogen carbonate, potassium hydrogen carbonate; acrylonitrile, etc. There can be mentioned a microcapsule type in which a thermal expansion gas such as hexane or isobutane is enclosed in a resin spherical shell. The addition amount is preferably about 1 to 10 parts by weight with respect to 100 parts by weight of the resin foam layer, and the expansion ratio is preferably about 5 to 15 times.

  Examples of the thermoplastic resin include low density polyethylene (including linear low density polyethylene), medium density polyethylene, high density polyethylene, homopolypropylene, ethylene-α-olefin copolymer, polymethylpentene, polybutene, and ethylene-propylene. Copolymer, propylene-butene copolymer, ethylene-vinyl acetate copolymer, saponified ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer and acid-modified products thereof; ionomer resin; polyethylene terephthalate, poly Polyester resins such as butylene terephthalate, polycarbonate, polyarylate, polyethylene naphthalate-isophthalate copolymer; polyamide resins, polyimide resins, polystyrene resins, polyacrylic resins, polyvinyl alcohol Resins, ABS resins, and among these polyolefin resins are preferred.

The thickness of the resin foam layer is preferably 0.5 to 5 mm, more preferably 1 to 2 mm. The thickness of the resin foam layer is such that when the pressure is released after pressing the floor decorative sheet with a load of 30 N / cm ² for 24 hours, the thickness restoration rate is 40% or more, and the thickness reduction is What is necessary is just to set according to the kind of foaming layer so that the requirement of being 1 mm or less may be satisfy | filled. By setting to such a pressure restoration rate, the floor decorative sheet of the present invention can provide the original walking feeling of natural wood when used as a floor decorative material.

  The resin foam layer may be colored as necessary. For example, when the resin foam layer is colored in the same color as the adherend, only the side surface of the resin foam layer does not stand out when used as a flooring decorative material, and exhibits excellent design. be able to. Moreover, the effect which relieves the influence of the cloudiness based on foaming is also acquired. It does not limit as a coloring agent which can be used at the time of coloring, The coloring agent etc. which can be used for a base material sheet can be used.

(Pattern pattern layer)
A pattern layer can be formed on the base sheet.

  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 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 base sheet and the pattern layer as necessary. The colored hiding layer is provided when it is desired to hide the ground color of the wooden board from the front surface of the decorative sheet. Of course, when the base sheet is transparent, even when the base sheet is concealed, it may be formed 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, dip coating method and the like described above are preferable.

  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)
A transparent adhesive layer can be formed on the pattern layer.

  The transparent adhesive layer is not particularly limited as long as it is transparent, and includes any of colorless and transparent, colored and transparent. The transparent adhesive layer can be 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 is formed on the transparent adhesive 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 a thermoplastic resin is preferable, among which polyolefin and polyester are preferable, and polypropylene is most preferable. It is preferable that the transparent resin layer is substantially formed of a polypropylene resin.

  The transparent resin layer is formed of, for example, 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.

  On the surface of the transparent resin layer, on which the transparent surface protective layer described later is formed, the surface of corona discharge treatment, ozone treatment, plasma treatment, ionizing radiation treatment, dichromate treatment, etc., as necessary Processing may be performed. The surface treatment may be performed according to a conventional method for each treatment.

  Although the thickness of a transparent resin layer is not specifically limited, About 10-150 micrometers is preferable and about 40-100 micrometers is more preferable.

  A primer layer (a primer layer for facilitating the formation of the transparent surface protective layer) may be formed on the surface of the transparent resin layer.

  A primer layer can be formed by apply | coating a well-known primer agent to the single side | surface or both surfaces of a base material sheet. Examples of the primer agent include a urethane resin-based primer agent composed of an acrylic-modified urethane resin and the like, and a resin-based primer agent composed of a block copolymer of acrylic and urethane.

  Although the thickness of a primer layer is not specifically limited, Usually, 0.1-10 micrometers, Preferably it is about 1-5 micrometers.

(Transparent surface protective layer)
A transparent surface protective layer is formed on the transparent resin layer. The transparent surface protective layer is not limited, but preferably contains at least one of an ionizing radiation curable resin and a two-component curable urethane resin as a resin component. Substantially those formed from these resins are preferred. When forming a transparent surface protective layer with ionizing radiation curable resin or 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, for example, various electron beam accelerators such as a cockcroft Walton type, a bandegraft type, a resonant transformer type, an insulated 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 transparent 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.

  For example, the transparent surface protective layer is formed by 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 applying the resin. It can be formed by curing. 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.

(Uneven pattern with an average roughness Rz of 60 μm or more)
In the decorative sheet for floor according to the present invention, the transparent surface protective layer is located on the outermost surface, and an uneven pattern having an average roughness Rz of 60 μm or more is formed on the front surface of the decorative sheet for floor. Since the uneven pattern having such an average roughness is formed, the tactile sensation when the surface of the decorative sheet for flooring is touched with the skin due to the synergistic effect with the resin foam layer, more warmth of the real wood and In addition to being close to the touch, a floating feeling (wood grain with large irregularities) can be expressed.

  The average roughness Rz, as represented by JISB0601 (1994), is the average roughness of a total of 10 points including 5 convex portions and 5 concave portions, and Rz in the present invention is 60 μm or more, and 90 μm or more. preferable. The upper limit of the average roughness Rz is preferably about 140 μm, because the adhesiveness when the decorative sheet for flooring and the resin foam layer are laminated may be lowered if the average roughness of the uneven pattern is too large. The degree is more preferable.

  The uneven pattern can be formed by embossing from the transparent surface protective layer side of the floor decorative sheet. For example, after the transparent surface protective layer is softened by heating, a texture is imparted by pressurizing and shaping with an embossed plate having a desired concavo-convex pattern and cooling and fixing. Embossing can be performed with a known single wafer or rotary embossing machine. Examples of the concavo-convex pattern include a wood grain conduit groove, a float pattern (a concavo-convex pattern of a raised annual ring), a hairline, a grain, and a satin texture.

(Pressure restoration rate of decorative sheet for floor)
The floor decorative sheet of the present invention has a thickness recovery rate of 40% or more when the pressure is released after pressing for 24 hours with a load of 30 N / cm ² , and the thickness loss is 1 mm or less. . By having such a pressure restoration rate, the original walking feeling of the wood provided by natural wood can be obtained.

In addition, the measuring method of the press restoration rate in this specification is as follows.
A floor decorative sheet is cut to a size of 10 cm ² to obtain a test sample, and the thickness is measured with a micrometer (manufactured by Mitutoyo Corporation: CLM1-15QM).
A test sample is sandwiched between MDF and MDF, and a load of 30 N / cm ² is pressed for 24 hours with a permanent strain tester (manufactured by Tester Sangyo Co., Ltd.).
-Immediately after releasing the pressure, the thickness of the test sample is measured with a micrometer, and the pressure restoration rate is calculated from the following formula.

Press restoration rate (%) = (Thickness after pressing / Thickness before pressing) × 100
In the present invention, the thickness recovery rate may be 40% or more, but 50 to 80% is more preferable. Moreover, although the thickness reduction | decrease should just be 1 mm or less, 0.5 mm or less is more preferable.

Floor decorative material The floor decorative sheet of the present invention can be made into a floor decorative material by laminating with an adherend.

  The material of various adherends is not particularly limited, and examples thereof include inorganic non-metallic materials, metallic materials, woody 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, polypropylene, ABS resin, phenol resin and the like can be mentioned.

  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.

  In order to bond the adherend and the decorative sheet for floor, for example, an adhesive can be used. Examples of the adhesive include polyvinyl acetate, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ionomer, butadiene / acrylonitrile rubber, neoprene rubber, natural rubber, and the like as active ingredients. Any known adhesive can be used.

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

  The floor decorative sheet of the present invention can be used as a floor decorative material by being laminated on an adherend. And since the resin foam layer is formed and the decorative sheet for flooring has a specific pressure restoring rate, the original walking feeling of the wood that natural wood has is obtained. Furthermore, the original warmth of the natural wood is obtained by forming an uneven pattern with an average roughness Rz of 60 μm or more on the front surface. As a result, the comfort unique to natural wood is obtained.

It is a cross-sectional schematic diagram of the decorative sheet for floors produced in the Example.

  Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. However, the present invention is not limited to the examples.

Examples 1-14 and Comparative Examples 1-16
A primer layer was provided on the back surface of a base sheet made of a colored polypropylene film having a thickness of 60 μm. Next, a picture pattern layer was formed on the front surface of the base sheet by printing, and a transparent adhesive layer was further formed on the picture print pattern layer. A transparent polypropylene resin sheet having a thickness of 80 μm was laminated on the transparent adhesive layer by extrusion lamination. After the corona discharge treatment was performed on the surface of the transparent polypropylene resin, a primer layer was formed by applying a two-component curable urethane resin. The surface is coated with 15 μm of ionizing radiation curable resin by a roll coating method, and then irradiated with an electron beam under the conditions of an acceleration voltage of 175 keV and 5 Mrad using an electron beam irradiation apparatus in an environment having an oxygen concentration of 200 ppm or less. The curable resin was cured. After heating the ionizing radiation curable resin side with an infrared non-contact type heater to soften the base sheet and the transparent resin layer, it is immediately embossed by hot pressure to form a grainy concavo-convex pattern (Rz = 61-66 [mu] m, Rz = 36-48 [mu] m of Comparative Example) was shaped. Next, the adhesive layer was formed in the back surface side of the base material sheet, and the decorative sheet for floors was produced by laminating | stacking a resin foam layer. Further, a floor decorative material was prepared by laminating a floor decorative sheet on an adherend (Lawan plywood, 12 mm thick).

  Table 1 below shows the average roughness (Rz), the resin foam layer, and the pressure recovery rate of the concavo-convex pattern of each Example and Comparative Example.

Test example 1
The feeling of walking (wood texture) of the floor decorative materials obtained in each Example and Comparative Example was examined.

  Twenty panelists were asked to walk on the floor cosmetics and answered the ease of walking.

  The evaluation criteria were A if the number of people who answered that it was easy to walk was 90% or more, B if 70% or more, C if 50% or more and less than 70%, and D if less than 50%. The test results are shown in Table 1.

Test example 2
The warmth (wood texture) of the floor decorative materials obtained in each Example and Comparative Example was examined.

  Twenty panelists were allowed to ride barefoot on the floor cosmetics and answered whether there was warmth. Specifically, the floor decorative material was allowed to stand for 24 hours while being kept at 5 ° C., and then evaluated based on the feeling when riding on the test piece with bare feet.

  The evaluation criteria were A if the number of respondents who did not feel marked coldness was 90% or more, B if 70% or more, C if 50% or more and less than 70%, and D if less than 50%. The test results are shown in Table 1.

[The decorative sheet in Table 1 shows the front side of the base sheet and is distinguished from the resin foam layer. The decorative sheet for floor of the present invention is a combination of a decorative sheet and a resin foam layer. ]
As is apparent from the results in Table 1, the floor decorative sheet of the present invention has a resin foamed layer, and the floor decorative sheet has a specific pressure recovery rate, so that the natural wood has natural wood. The feeling of walking is obtained. Furthermore, the original warmth of the natural wood is obtained by forming an uneven pattern with an average roughness Rz of 60 μm or more on the front surface.

1. 1. Resin foam layer 2. Adhesive layer 3. Back primer layer 4. base material sheet Pattern layer 6 6. Transparent adhesive layer 7. Transparent resin layer Primer layer9. Transparent surface protective layer

Claims (6)

On the base sheet, a floor decorative sheet having at least a transparent resin layer and a transparent surface protective layer in order,
(1) The front surface of the decorative sheet for floor has an uneven pattern with an average roughness Rz of 60 to 140 μm ,
(2) On the back surface of the base sheet, there is a resin foam layer ,
(3) The floor decorative sheet has a thickness recovery rate of 40% or more when the pressure is released after pressing for 24 hours with a load of 30 N / cm ² , and the thickness loss is 1 mm or less. is there,
This is a decorative sheet for floors.   The decorative sheet for floor according to claim 1, wherein the resin foam layer has a thickness of 1 to 2 mm.   The decorative sheet for floor according to claim 1 or 2, wherein the resin foam layer is colored.   The said transparent surface protective layer is a decorative sheet for floors in any one of Claims 1-3 containing at least 1 sort (s) of an ionizing radiation curable resin and a 2 liquid curable urethane type resin.   The decorative sheet for floors in any one of Claims 1-4 which has a pattern pattern layer, a transparent adhesive bond layer, a transparent resin layer, and a transparent surface protection layer in order on a base material sheet. A floor decorative material having the floor decorative sheet according to any one of claims 1 to 5 on an adherend.

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