WO2018159660A1 - 化粧シート及び化粧板 - Google Patents
化粧シート及び化粧板 Download PDFInfo
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- WO2018159660A1 WO2018159660A1 PCT/JP2018/007437 JP2018007437W WO2018159660A1 WO 2018159660 A1 WO2018159660 A1 WO 2018159660A1 JP 2018007437 W JP2018007437 W JP 2018007437W WO 2018159660 A1 WO2018159660 A1 WO 2018159660A1
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- Prior art keywords
- layer
- olefin resin
- resin layer
- decorative sheet
- decorative
- Prior art date
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Images
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- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
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- B32B2471/00—Floor coverings
Definitions
- the present invention relates to a decorative sheet and a decorative board.
- Patent Document 1 In order to improve the scratch resistance of a decorative sheet used as a surface material for building materials, a method of forming a surface protective layer of the sheet from a cured coating film of an ionizing radiation curable resin is known. However, even such a decorative sheet for floors, which is said to have excellent scratch resistance, is not damaged at all. There is a problem of sticking (Patent Document 1).
- An object of the present invention is to provide a decorative sheet having excellent scratch resistance under high load conditions and excellent bending workability, and a decorative board using the decorative sheet.
- the indentation hardness H IT 2 of the second olefin resin layer and the indentation hardness H IT 1 of the surface protective layer are the following formulas (1) and (2): H IT 2 ⁇ 100 MPa (1) H IT 1 > H IT 2 (2) A decorative sheet characterized by satisfying 2.
- the indentation hardness H IT 1 of the surface protective layer is represented by the following formula (3): 450 MPa> H IT 1 (3)
- Item 4. The decorative sheet according to any one of Items 1 to 3, wherein the second olefin resin layer is a microcrystalline olefin resin layer. 5).
- a decorative board comprising a laminate comprising, in order in the thickness direction, a decorative board substrate and the decorative sheet according to any one of Items 1 to 5.
- the present invention it is possible to obtain a decorative sheet having excellent scratch resistance under high load conditions and excellent bending workability, and a decorative board using the decorative sheet.
- FIG. 1 is a schematic view showing a cross section of one embodiment of the decorative sheet of the present invention, and a makeup having a first olefin resin layer 3, a second olefin resin layer 2, and a surface protective layer 1 in this order in the thickness direction.
- a sheet 10 is shown.
- the embossing recessed part 4 is formed at least from the surface protective layer side.
- the direction in which the surface protective layer 1 is laminated as viewed from the second olefin resin layer 2 is referred to as “up” or “front surface”, and the second olefin resin.
- the direction in which the first olefin resin layer 3 is laminated as viewed from the layer 2 is referred to as “lower” or “back surface”.
- the “front (side) surface” or “surface protective layer (side) surface” of the decorative sheet or decorative plate means a surface visually recognized after the decorative sheet or decorative plate is applied.
- a decorative sheet 10 of the present invention is a decorative sheet having a first olefin resin layer 3, a second olefin resin layer 2, and a surface protective layer 1 in this order as shown in FIG. Second olefin indentation hardness of the resin layer 2 of the indentation hardness H IT 2 and the surface protective layer 1 H IT 1 and the following formulas (1) and (2); H IT 2 ⁇ 100 MPa (1) H IT 1 > H IT 2 (2) It is characterized by satisfying.
- indentation hardness of each layer is indicated by nanoindentation hardness measured using a surface film physical property tester, Tribo Indenter (registered trademark) “TI-950” (manufactured by HYSITRON). .
- a method for measuring the indentation hardness (H IT ) of each layer using TriboIndenter (registered trademark) “TI-950” is as follows. (1) Using the Berkovich indenter shown in FIG. 4 (a), the Berkovich indenter is pushed into the measurement sample as shown in FIG. From the target shape, the “contact projected area (Ap) (mm 2 ) corrected by the apparatus standard method” is calculated, and the maximum test load (F max ) is divided by Ap to determine the hardness.
- the indentation conditions are as follows: First room temperature (laboratory environment temperature) for the first olefin resin layer and the second olefin resin layer, as shown in FIG. Is added for 5 seconds (ie 10 ⁇ N / s), then held at a load of 50 ⁇ N (F max ) for 5 seconds, and finally unloading from 50-0 ⁇ N is performed for 10 seconds.
- a load of 0 to 100 ⁇ N is first applied for 10 seconds (that is, 10 ⁇ N / s), then held at a load of 100 ⁇ N (F max ) for 5 seconds, and finally removed to 100 to 0 ⁇ N. Load in 10 seconds.
- the indentation amount (h) is about 100 to 150 nm
- the thickness in the indentation direction of the layer to be the measurement sample may be 1.0 ⁇ m or more (preferably 1.5 ⁇ m or more).
- a decorative sheet is embedded with a resin (cold-curing type epoxy two-component curable resin), allowed to stand at room temperature for 24 hours or more and cured, and then the cured embedded sample is mechanically polished to measure the layer to be measured
- the cross section of each layer is exposed, and when the Barkovic indenter is pushed into the cross section of the layer to be measured (the position where the fine particles such as filler are avoided), the hardness of the cross section of each layer is increased. taking measurement.
- the indentation hardness at 10 locations was measured so that no deviation occurred, and the average values at 10 locations were determined as “indentation hardness H IT 1 of the surface protective layer” and “second olefin resin”, respectively. “Indentation hardness H IT 2 of the layer” and “Indentation hardness H IT 3 of the first olefin resin layer”.
- the second and the indentation hardness H IT 1 olefin resin layer indentation hardness H IT 2 and the surface protective layer of necessary to satisfy the following formula (1) and (2).
- the indentation hardness of the second olefin resin layer and the surface protective layer does not satisfy the following formulas (1) and (2), excellent scratch resistance and bending workability under high load conditions cannot be obtained. .
- H IT 2 ⁇ 100 MPa (1) H IT 1 > H IT 2 (2)
- the indentation hardness H IT 1 of the surface protective layer needs to be larger than the indentation hardness H IT 2 of the second olefin resin layer for the purpose of exhibiting scratch resistance at a relatively high load. And it is over 100 MPa.
- the indentation hardness H IT 1 of the surface protective layer is expressed by the following formula (3); 450 MPa> H IT 1 (3) It is preferable to satisfy.
- the indentation hardness H IT 2 of the second olefin resin layer and the indentation hardness H IT 3 of the first olefin resin layer is a compound represented by the following formula (4); H IT 2 > H IT 3 (4) It is preferable to satisfy.
- the first olefin resin layer is a layer made of an olefin resin.
- the olefin resin examples include homopolymers of olefins such as ethylene, propylene, and butene; block copolymers of ethylene-propylene, random copolymers; ethylene And a copolymer of at least one of propylene and at least one other olefin such as butene, pentene, hexene; at least one of ethylene and propylene and at least one other monomer such as vinyl acetate and vinyl alcohol; And the like.
- polyethylene and polypropylene are preferable and polyethylene is particularly preferable from the viewpoint of obtaining excellent scratch resistance and good bending workability.
- the polyethylene may be a homopolymer of ethylene, ethylene and other comonomers copolymerizable with ethylene (for example, ⁇ -olefins such as propylene, 1-butene, 1-hexene, 1-octene, acetic acid) And a copolymer with vinyl, vinyl alcohol, etc.).
- the polyethylene resin include high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE), and ultra high molecular weight polyethylene ( UHMWPE), cross-linked polyethylene (PEX) and the like. These polyethylenes may be used alone or in combination of two or more.
- Polypropylene may be a homopolymer of propylene, or other comonomer copolymerizable with propylene (for example, ⁇ -olefin such as ethylene, 1-butene, 1-hexene, 1-octene; acetic acid) And a copolymer with vinyl, vinyl alcohol, etc.). These polypropylenes may be used alone or in combination of two or more.
- the indentation hardness H IT 3 of the first olefin resin layer and the indentation hardness H IT 2 of the second olefin layer it is preferred to have the relationship of formula (4).
- the indentation hardness H IT 3 of the first olefin resin layer is preferably 10 to 80 MPa, and preferably 15 to 70 MPa. Is more preferable, 20 to 60 MPa is further preferable, and 30 to 55 MPa is particularly preferable.
- the scratch resistance and impact resistance (especially dent resistance) of the decorative sheet can be maintained satisfactorily, and in addition, the tension applied at the time of printing when performing printing or coating with a printing press is first. It can suppress that an olefin resin layer elongates. In addition, it is easy to suppress cracking and breakage of the surface protective layer in bending, and the impact resistance (particularly crack resistance) can be maintained well.
- the indentation hardness can be appropriately set by mixing two or more kinds of resins having different hardnesses or mixing an elastomer with the resin.
- the thickness of the first olefin resin layer is preferably 30 to 120 ⁇ m, more preferably 40 to 110 ⁇ m, still more preferably 50 to 100 ⁇ m, and particularly preferably 55 to 85 ⁇ m from the viewpoint of excellent scratch resistance and bending workability.
- the thickness of the 1st olefin resin layer in this specification, the 2nd olefin resin layer, and the surface protective layer is an average value at the time of measuring the thickness of 10 places.
- the second olefin resin layer is a layer made of an olefin resin, and the indentation hardness H IT 2 is a layer that needs to satisfy the above formulas (1) and (2).
- Examples of the olefin resin that forms the second olefin resin layer include the same olefin resins that can form the first olefin resin layer. Of these, polyethylene and polypropylene are preferred, and polypropylene is particularly preferred from the viewpoint of excellent scratch resistance and bending workability.
- Polypropylene may be a homopolymer of propylene, or other comonomer copolymerizable with propylene (for example, ⁇ -olefin such as ethylene, 1-butene, 1-hexene, 1-octene; acetic acid) And a copolymer with vinyl, vinyl alcohol, etc.). These polypropylenes may be used alone or in combination of two or more. In the present invention, a homopolymer of propylene (homopolypropylene) is particularly preferable from the viewpoint of excellent scratch resistance and bending workability.
- the second olefin resin layer needs to satisfy the following formulas (1) and (2) with respect to its indentation hardness H IT 2 , and preferably satisfies the following formula (4).
- H IT 2 ⁇ 100 MPa (1) H IT 1 > H IT 2 (2) H IT 2 > H IT 3 (4)
- the indentation hardness H IT 2 of the second olefin resin layer is preferably 100 MPa or more and 200 MPa or less, more preferably 105 MPa or more and 150 MPa or less, and still more preferably 110 MPa or more and 130 MPa or less, from the viewpoint of the balance between scratch resistance and bending workability. .
- H IT 2 When H IT 2 is less than 100 MPa, the scratch resistance and impact resistance (particularly dent resistance) is poor, or the second olefin resin layer is stretched by the tension applied during printing when printing or coating is performed on a printing press. May end up. On the other hand, if it exceeds 200 MPa, the surface protective layer may be cracked or broken in bending and impact resistance (particularly crack resistance) may be inferior.
- the indentation hardness H IT 2 for example, two or more kinds of resins having different hardnesses are mixed, an elastomer is mixed with the resin, and the second olefin resin layer is microcrystalline olefin. It can set suitably by setting it as a resin layer.
- the olefin resin composition forming the second olefin resin layer can be melted by adding a crystal nucleating agent and then cooled.
- the cooling method include cooling by a chill roll method in which cooling is performed by bringing the material extruded from the die into contact with a cooling roll (chill roll) through which cooling water has passed during extrusion molding.
- crystal nucleating agent examples include metal salt-based crystal nucleating agents such as fatty acid metal salts, metal salts of phosphonic acid, metal salts of phosphate esters, metal salts of benzoic acid, metal salts of pimelic acid, and rosin metal salts; fatty acid esters, aliphatic And organic crystal nucleating agents such as amide, benzylidene sorbitol, quinacridone and cyanine blue; inorganic crystal nucleating agents such as talc; and the like.
- metal salt-based crystal nucleating agents such as fatty acid metal salts, metal salts of phosphonic acid, metal salts of phosphate esters, metal salts of benzoic acid, metal salts of pimelic acid, and rosin metal salts
- fatty acid esters aliphatic And organic crystal nucleating agents such as amide, benzylidene sorbitol, quinacridone and cyanine blue
- inorganic crystal nucleating agents such as tal
- the crystal nucleating agent those in which the above-described crystal nucleating agent is encapsulated in a nanoshell can also be used.
- the crystal nucleating agent encapsulated in the nanoshell the crystal nucleating agent is more uniformly dispersed in the second olefin resin layer, so it can be easily and stably regardless of various conditions such as melting conditions and cooling conditions.
- the indentation hardness H IT 2 can be adjusted, and excellent scratch resistance and good bending workability can be obtained.
- the “nanoshell” is “a hollow vesicle having a membrane structure closed in a nanosize shell”, preferably having an average primary particle diameter of less than 380 nm, more preferably 375 nm or less.
- the average primary particle diameter is a value calculated by statistical processing from an observation image measured with a transmission electron microscope (TEM) or a scanning transmission electron microscope (STEM). Specifically, the calculation by statistical processing is performed by calculating the diameter of 1000 particles randomly selected from the SEM image and using the following formula (A) when a 3-nm histogram is created. It is a thing.
- the number average primary particle diameter D np obtained by the formula (A) was defined as the average primary particle diameter in the present specification.
- the average primary particle diameter of the nanoshell is less than the wavelength region of visible light (380 to 750 nm), and the wavelength of visible light Or less, that is, less than 380 nm, more preferably 1 nm or more and less than 380 nm, more preferably 1 to 375 nm, still more preferably 5 to 300 nm, and more preferably 10 to 250 nm. Even more preferred is 15 to 200 nm.
- the average primary particle diameter is in the above range, the indentation hardness of the second olefin resin layer can be adjusted more easily, and excellent scratch resistance and bending workability can be obtained.
- the nanoshell is not particularly limited as long as it can enclose the above-described crystal nucleating agent, but may be a single layer film or a multilayer film, but the average primary particle size is made smaller. From the viewpoint of improving the dispersibility of the crystal nucleating agent and improving the excellent scratch resistance and bending workability more efficiently, a single layer film is preferable.
- phospholipids are preferable from the viewpoint of more easily adjusting the indentation hardness of the second olefin resin layer and obtaining excellent scratch resistance and bending workability.
- the form of the nanoshell is more preferably a monolayer film made of phospholipid.
- a nanoshell made of phospholipid compatibility with the resin forming the second olefin resin layer is improved, so that the indentation hardness of the second olefin resin layer is adjusted, and excellent scratch resistance and This is advantageous in obtaining bending workability.
- the nanoshell is a single-layer film, the average primary particle size is smaller, so the dispersibility of the crystal nucleating agent is improved by the synergistic effect with the dispersibility improvement by the phospholipid forming the nanoshell, It becomes possible to adjust the indentation hardness of the second olefin resin layer more efficiently and to obtain excellent scratch resistance and bending workability.
- phospholipids examples include glycerophospholipids such as phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, phosphatidic acid, phosphatidylglycerol, phosphatidylinositol, cardiopine, egg yolk lecithin, hydrogenated egg yolk lecithin, soybean lecithin, hydrogenated soybean lecithin; And sphingophospholipids such as sphingomyelin, ceramide phosphorylethanolamine, and ceramide phosphorylglycerol. These phospholipids can be used alone or in combination of two or more.
- Examples of the method of encapsulating the crystal nucleating agent in the nanoshell include the Bangham method, the extrusion method, the hydration method, the surfactant dialysis method, the reverse phase evaporation method, the freeze-thaw method, and the supercritical reverse phase evaporation method. Can be mentioned.
- the Bangham method is such that after adding a phospholipid to a solvent such as chloroform or methanol to dissolve it, the solvent is removed using an evaporator to form a thin film made of phospholipid, and the crystal nucleating agent is added.
- the mixture is hydrated and dispersed by stirring at a high speed of, for example, about 1000 to 2500 rpm using a mixer, and the crystal nucleating agent is encapsulated in the nanoshell.
- the extrusion method is a method of passing through a filter instead of the mixer used as external perturbation.
- the hydration method is a method in which the crystal nucleating agent is encapsulated in the nanoshell by gently stirring and dispersing in the Bangham method without using a mixer.
- a phospholipid is dissolved in a solvent such as diethyl ether or chloroform, and the above-described crystal nucleating agent (which may be in a dispersion state) is added to form a W / O emulsion.
- the solvent is removed below, water is added, and the crystal nucleating agent is encapsulated in the nanoshell.
- the freeze-thaw method is a method of performing at least one of cooling and heating as an external perturbation, and is a method of encapsulating a crystal nucleating agent in a nanoshell by repeating cooling and heating.
- the supercritical reverse phase evaporation method is a method of encapsulating a crystal nucleating agent in a nanoshell using carbon dioxide in a supercritical state, a temperature condition above a critical point, or a pressure condition.
- carbon dioxide in a supercritical state means carbon dioxide in a supercritical state at a critical temperature (30.98 ° C.) and a critical pressure (7.3773 ⁇ 0.0030 MPa) or more, and a temperature condition above the critical point.
- Carbon dioxide under or under pressure means carbon dioxide under conditions where only one of temperature or criticality has exceeded critical conditions.
- the supercritical reverse phase evaporation method involves adding water to a mixture of the above crystal nucleating agent, supercritical carbon dioxide, and phospholipid, and stirring the mixture to obtain an emulsion of supercritical carbon dioxide and an aqueous phase. Then, carbon dioxide expands and evaporates by reducing the pressure, causing phase inversion, forming a nanoshell in which the surface of the crystal nucleating agent is covered with a monolayer film of phospholipid, and the crystal nucleus encapsulated in the nanoshell It is to obtain an agent.
- supercritical carbon dioxide may be added to a mixture of a crystal nucleating agent, a phospholipid, and water in the above method.
- the nanoshell has a molecular weight of 10,000 to 500,000, preferably 15,000, such as materials other than phospholipids, such as aliphatic polyvalent polycarboxylic acid, polycarboxylic acid alkylamine, and poly (meth) acrylic acid.
- ⁇ 300,000 more preferably about 20,000 to 200,000 high molecular surfactants; lauric acid, myristic acid, stearic acid, behenic acid, montanic acid, ricinoleic acid, etc., preferably 10 to 30 carbon atoms, more preferably Fatty acid metal salt in which 12 to 28 saturated or unsaturated fatty acid and metal such as lithium, sodium, potassium, magnesium, calcium, barium, zinc, aluminum are bonded; (meth) acryloxypropyltriethoxysilane, (meth) (Meth) acryloxy-based silane coupling agents such as acryloxypropyltrimethoxysilane, vinyl Vinyl-based silane coupling agents such as ethoxysilane and vinyltrimethoxysilane, (epoxycyclohexyl) ethyltrimethoxysilane, epoxy-based silane coupling agents such as glycidoxypropyltrimethoxysilane, and isocyanate-based compounds such as
- a phosphate ester metal salt-based crystal nucleating agent (2,2′-methylenebis- (4,6-di-tert-butylphenyl) phosphoric acid is used as a crystal nucleating agent.
- a phosphate ester metal salt-based crystal nucleating agent (2,2′-methylenebis- (4,6-di-tert-butylphenyl) phosphoric acid is used as a crystal nucleating agent.
- a container in which 100 parts by mass of an organic solvent such as methanol, 60-100 parts by mass of the above-described phosphate metal salt-based crystal nucleating agent as a crystal nucleating agent, and 2-10 parts by mass of phosphatidylcholine as a phospholipid are maintained at 40-70 ° C.
- an organic solvent such as methanol
- a crystal nucleating agent (phosphate metal salt-based crystal nucleating agent) encapsulated in the nanoshell of the layer film can be produced.
- the primary average particle size of the crystal nucleating agent encapsulated in the obtained nanoshell is about 10 to 250 nm.
- the content of the crystal nucleating agent in the second olefin resin layer is preferably 0.01 to 5 parts by mass and more preferably 0.02 to 3 parts by mass with respect to 100 parts by mass of the resin component forming the second olefin resin layer. Preferably, 0.03 to 1 part by mass is more preferable, and 0.05 to 0.5 part by mass is particularly preferable.
- the content of the crystal nucleating agent is within the above range, it is easy to uniformly disperse in the resin forming the second olefin resin layer, and the effect as a crystal nucleating agent is easily obtained, and it is easy and stable indentation.
- the hardness H IT 2 can be adjusted, and excellent scratch resistance and bending workability can be obtained.
- the thickness of the second olefin resin layer is preferably 30 to 120 ⁇ m, more preferably 40 to 110 ⁇ m, still more preferably 50 to 100 ⁇ m, and particularly preferably 55 to 85 ⁇ m from the viewpoint of obtaining excellent scratch resistance and bending workability. preferable. If it is less than 30 ⁇ m, scratch resistance and impact resistance (particularly dent resistance) may be inferior, or the second olefin resin layer may be stretched by the tension applied during printing when printing or coating is performed on a printing press. . On the other hand, if it exceeds 120 ⁇ m, the surface protective layer may be cracked or broken in bending, and the impact resistance (particularly crack resistance) may be inferior. (Surface protective layer) As shown in FIGS.
- the surface protective layer is a layer provided on the outermost surface of the decorative sheet and exposed to the outer surface, and has surface characteristics such as stain resistance, scratch resistance, and chemical resistance of the decorative sheet. It is provided in order to improve. Further, the surface protective layer requires that the indentation hardness H IT 1 satisfies the following formula (2).
- H IT 1 > H IT 2
- the indentation hardness H IT 1 of the surface protective layer needs to be larger than the indentation hardness H IT 2 of the second olefin resin layer for the purpose of exhibiting scratch resistance under a relatively high load, and 100 MPa. Excess.
- the indentation hardness can be appropriately set by mixing two or more kinds of resins having different hardnesses or mixing an elastomer with the resin.
- the indentation hardness H IT 1 is preferably 170 MPa or more, more preferably 250 MPa or more, further preferably 300 MPa or more, and 350 MPa or more. Even more preferred.
- the indentation hardness H IT 1 preferably satisfies the following formula (3), more preferably 400 MPa or less, more preferably 350 MPa or less, and even more preferably 320 MPa or less.
- H IT 1 450 MPa> H IT 1 (3)
- preferable range of multi-step upper and lower limits of the indentation hardness H IT 1 described above may be combined.
- the range of H IT 1 can be 350 MPa or more and less than 450 MPa by combining the maximum value of the lower limit and the maximum value of the upper limit.
- the surface protective layer is made of a cured product of the curable resin composition from the viewpoint of improving the surface properties of the decorative sheet such as stain resistance, scratch resistance, chemical resistance, and satisfying the above indentation hardness.
- the curable resin composition includes, for example, a resin composition containing a curable resin such as a thermosetting resin, a two-component curable resin, and an ionizing radiation curable resin, and obtains more excellent surface characteristics. From the viewpoint, a resin composition containing a two-component curable resin and an ionizing radiation curable resin as the curable resin is preferable.
- the two-component curable resin is not particularly limited as long as it is a resin that is cured by the main agent and the curing agent.
- the two-component curable urethane has a polyol (polyhydric alcohol) as the main agent and an isocyanate curing agent as the main agent. Resin.
- the main agent examples include polyols such as polyethylene glycol, polypropylene glycol, butylene glycol, neopentyl glycol, and 1,6-hexanediol; polyols having a hydroxyl group as a functional group such as acrylic polyol, polyester polyol, and polyether polyol; Preferably mentioned. These can be used individually or in mixture of multiple types.
- isocyanate curing agent a conventionally known compound may be appropriately used.
- aromatic isocyanate such as 2,4-tolylene diisocyanate (TDI), xylene diisocyanate (XDI), naphthalene diisocyanate
- 1,6- Polyisocyanates such as aliphatic (or alicyclic) isocyanates such as hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI), methylene diisocyanate (MDI), and hydrogenated tolylene diisocyanate are used.
- HMDI hexamethylene diisocyanate
- IPDI isophorone diisocyanate
- MDI methylene diisocyanate
- hydrogenated tolylene diisocyanate hydrogenated tolylene diisocyanate
- adducts or multimers of these various isocyanates for example, adducts of tolylene diisocyanate, tolylene diis
- the ionizing radiation curable resin is an ionizing radiation, that is, an electromagnetic wave or a charged particle beam having an energy quantum capable of polymerizing or crosslinking a molecule, for example, an ultraviolet ray (UV) or an electron beam (EB), an X-ray, It is a resin that cures when irradiated with electromagnetic waves such as ⁇ rays, charged particle beams such as ⁇ rays and ion rays.
- the ionizing radiation curable resin can be appropriately selected from conventionally used polymerizable monomers, polymerizable oligomers and prepolymers.
- a (meth) acrylate monomer having a radical polymerizable unsaturated group in the molecule is suitable, and among them, a polyfunctional (meth) acrylate monomer is preferred.
- the polyfunctional (meth) acrylate monomer may be a (meth) acrylate monomer having two or more ethylenically unsaturated bonds in the molecule, such as diethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, Preferred examples include trimethylolpropane tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and the like.
- These (meth) acrylate monomers can be used alone or in combination of two or more.
- an oligomer having a radically polymerizable unsaturated group in the molecule for example, urethane (meth) acrylate oligomer, epoxy (meth) acrylate oligomer, polyester (meth) acrylate oligomer, polyether (meth) acrylate oligomer, acrylic (Meth) acrylate oligomers such as (meth) acrylate oligomers are preferred.
- urethane (meth) acrylate oligomer epoxy (meth) acrylate oligomer, polyester (meth) acrylate oligomer, polyether (meth) acrylate oligomer, acrylic (Meth) acrylate oligomers such as (meth) acrylate oligomers are preferred.
- These polymerizable oligomers can be used alone or in combination of two or more.
- the curable resin composition may contain a dispersant described later in addition to the curable resin described above.
- the curable resin composition has, as an additive, an ultraviolet absorber, an ultraviolet shielding agent, a light stabilizer, an abrasion resistance improver, a polymerization inhibitor, a crosslinking agent, and an infrared absorber as long as the object of the present invention is not impaired.
- An agent, an antistatic agent, an adhesion improver, a leveling agent, a thixotropic agent, a coupling agent, a plasticizer, an antifoaming agent, a filler, an antiblocking agent, a lubricant, a solvent, and the like can be added.
- weathering agents such as an ultraviolet absorber and a light stabilizer, for a weather resistance improvement.
- ultraviolet absorbers examples include benzophenone, benzotriazole, triazine, salicylate, and acrylonitrile
- light stabilizer examples include hindered amine, acrylate, oxamide, and cyanoacrylate.
- the surface protective layer can contain a dispersant.
- dispersant examples include polymer surfactants, fatty acid metal salts, silane coupling agents, titanate coupling agents, silicone oils, waxes, modified resins and the like exemplified as materials capable of forming the above nanoshell. These dispersants can be used alone or in combination of two or more.
- a dispersant encapsulated in the nanoshell is used as the dispersant.
- the nanoshell in the dispersant encapsulated in the nanoshell may be the same nanoshell as the crystal nucleant encapsulated in the nanoshell in the second olefin resin layer, and the production method thereof is also a method for producing the crystal nucleant encapsulated in the nanoshell. The same.
- Indentation hardness can be easily increased by containing a dispersant encapsulated in the nanoshell and inorganic fine particles described later.
- 100 parts by mass of an organic solvent such as methanol, 40 to 80 parts by mass of methacryloxypropyltrimethoxysilane as a dispersant, and 2 to 10 parts by mass of phosphatidylcholine as a phospholipid are placed in a container kept at 40 to 70 ° C. and sealed. Then, carbon dioxide is supplied into the container so that the internal pressure becomes 7.5 to 25 MPa, and a supercritical state is obtained. Next, the inside of the container is stirred at a high speed of about 1000 to 2500 rpm, and 50 to 150 parts by mass of ion-exchanged water is supplied.
- an organic solvent such as methanol
- methacryloxypropyltrimethoxysilane as a dispersant
- 2 to 10 parts by mass of phosphatidylcholine as a phospholipid are placed in a container kept at 40 to 70 ° C. and sealed. Then, carbon dioxide is supplied into the container so that the internal pressure becomes 7.5 to 25 MPa,
- Stirring is continued for about 10 to 25 minutes while maintaining the temperature and pressure to be in a supercritical state, and then carbon dioxide is discharged from the container, and the inside of the container is returned to atmospheric pressure.
- a dispersant methacryloxypropyltrimethoxysilane encapsulated in the nanoshell of the layer film can be produced.
- the average primary particle size of the dispersant encapsulated in the nanoshell thus obtained is preferably less than 380 nm, more specifically the average primary particle size of the dispersant encapsulated in the nanoshell. Is preferably 1 nm or more and less than 380 nm, more preferably 1 to 375 nm, still more preferably 5 to 300 nm, still more preferably 10 to 250 nm, and particularly preferably 15 to 200 nm.
- the content of the dispersant is preferably 0.01 to 30 parts by weight, more preferably 0.05 to 15 parts by weight, and more preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of the resin component forming the surface protective layer. Is more preferable, and 0.3 to 5 parts by mass is particularly preferable.
- the surface protective layer preferably further contains inorganic fine particles from the viewpoint of improving the scratch resistance.
- inorganic fine particles include silica, alumina, aluminosilicate, kaolinite, calcium carbonate, barium sulfate, and glass.
- the average particle diameter of the inorganic fine particles is not limited, but is preferably 20 ⁇ m or less, more preferably 1 to 20 ⁇ m, and more preferably 2 to 15 ⁇ m.
- the average particle diameter of the inorganic fine particles is a 50% particle diameter (d50: median diameter) when the particles in the solution are measured by a dynamic light scattering method and the particle diameter distribution is represented by a cumulative volume distribution.
- the 50% particle diameter can be measured using, for example, a Microtrac particle size analyzer (manufactured by Nikkiso Co., Ltd.).
- the content of the inorganic fine particles is preferably 1 to 30 parts by mass, more preferably 2 to 25 parts by mass, and further preferably 5 to 20 parts by mass with respect to 100 parts by mass of the resin component forming the surface protective layer.
- the thickness of the surface protective layer is preferably 3 to 45 ⁇ m, more preferably 5 to 35 ⁇ m, still more preferably 10 to 30 ⁇ m.
- excellent surface characteristics can be obtained by the combination of the first olefin resin layer and the second olefin resin layer.
- the decorative sheet of the present invention can have, for example, a decorative layer, a primer layer, an adhesive layer, etc., in addition to the first olefin resin layer, the second olefin resin layer, and the surface protective layer, depending on the application.
- the decorative sheet of the present invention can have a decorative layer from the viewpoint of improving design properties.
- the decorative layer can be provided, for example, between the first olefin resin layer and the second olefin resin layer, between the second olefin resin layer and the surface protective layer, on the surface protective layer, or the like.
- the decorative layer may be, for example, a colored layer (so-called solid colored layer) covering the entire surface, or a pattern layer formed by printing various patterns using ink and a printing machine. It may be a combination thereof. Furthermore, the decoration layer may be provided in a plurality of locations in the same layer, or may be provided in a plurality of layers as well as one layer.
- the design property can be improved while concealing the coloring by using a solid colored layer.
- a solid colored layer and a pattern layer may be combined.
- the ground pattern of the decorative board base material is to be used, only the pattern layer is provided instead of the solid colored layer. Good.
- a binder As the ink used for the decoration layer, a binder, a colorant such as a pigment or a dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, a curing agent, an ultraviolet absorber, a light stabilizer, or the like is appropriately used. Is done.
- the binder is not particularly limited.
- urethane resin acrylic polyol resin, acrylic resin, ester resin, amide resin, butyral resin, styrene resin, urethane-acrylic copolymer, polycarbonate urethane-acrylic copolymer (polymer main component)
- Urethane-acrylic copolymer derived from a polymer having a carbonate bond in the chain and having two or more hydroxyl groups in the terminal and side chains polycarbonate polyol
- vinyl chloride-vinyl acetate copolymer resin vinyl chloride-acetic acid
- Preferred examples include resins such as vinyl-acrylic copolymer resins, chlorinated propylene resins, nitrocellulose resins, and cellulose acetate resins. These binders can be used alone or in combination of two or more.
- the colorant examples include, for example, white pigment, iron black, yellow lead, titanium yellow, petal, cadmium red, ultramarine blue, and cobalt blue from the viewpoint of coloring and concealing the background color of the decorative board substrate and improving the design.
- Inorganic pigments such as: organic pigments or dyes such as quinacridone red, isoindolinone yellow, phthalocyanine blue; metal pigments composed of scaly foils such as aluminum and brass; scaly foils such as titanium dioxide-coated mica and basic lead carbonate Colorants such as pearlescent (pearl) pigments made of pieces can also be used.
- the pattern may be a wood grain pattern, a marble pattern (for example, travertine marble pattern), a stone pattern imitating the surface of a rock, a fabric pattern imitating a cloth or cloth pattern, or a tile
- a marble pattern for example, travertine marble pattern
- a stone pattern imitating the surface of a rock a fabric pattern imitating a cloth or cloth pattern
- a tile There are pasting patterns, brickwork patterns, etc., and there are also patterns such as parquets and patchwork that combine these.
- These patterns are formed by multicolor printing with the usual yellow, red, blue and black process colors, as well as by multicolor printing with special colors prepared by preparing the individual color plates that make up the pattern. Is done.
- the thickness of the decorative layer may be appropriately selected according to the desired pattern, but is preferably 0.5 to 20 ⁇ m from the viewpoint of coloring and concealing the background color of the decorative board substrate and improving the design. ⁇ 10 ⁇ m is more preferred, and 2 to 5 ⁇ m is even more preferred.
- the primer layer is a layer provided mainly for improving the adhesion of each layer.
- the primer layer can be provided, for example, on one side or both sides of the first olefin resin layer, one side or both sides of the second olefin resin layer, and the like.
- a physical surface treatment such as an oxidation method or a concavo-convex method, or a chemical treatment is performed on one or both surfaces of the first olefin resin layer and the second olefin resin layer.
- a surface treatment such as a surface treatment may be performed.
- the primer layer is formed of a resin composition in which a solvent, a stabilizer, a plasticizer, a catalyst, a curing agent, an ultraviolet absorber, a light stabilizer, and the like are appropriately mixed with the binder exemplified as the binder that can be used for the decorative layer. can do.
- the thickness of the primer layer is preferably from 0.2 to 10 ⁇ m, more preferably from 0.5 ⁇ m to 8 ⁇ m, and even more preferably from 1 to 5 ⁇ m, from the viewpoint of improving adhesion.
- the decorative sheet of the present invention may include a synthetic resin backer layer on the lowermost layer of the decorative sheet, that is, on the first olefin resin layer side of the decorative sheet. By providing the synthetic resin backer layer, the impact resistance of the decorative material is further improved.
- Examples of the resin constituting the synthetic resin backer layer include polypropylene, ethylene-vinyl alcohol copolymer, polymethylene, polymethylpentene, polyethylene terephthalate, high heat-resistant polyalkylene terephthalate [for example, a part of ethylene glycol is 1 Polyethylene terephthalate substituted with 1,4-cyclohexanedimethanol, diethylene glycol, etc., so-called trade name PET-G (manufactured by Eastman Chemical Company)], polybutylene terephthalate, polyethylene naphthalate, polyethylene naphthalate-isophthalate copolymer, Polycarbonate, polyarylate, polyimide, polystyrene, polyamide, ABS and the like can be mentioned. These resins can be used alone or in combination of two or more.
- the thickness of the synthetic resin backer layer is preferably 0.1 to 0.6 mm, more preferably 0.15 to 0.45 mm, and still more preferably 0.20 to 0.40 mm.
- the thickness of the synthetic resin backer layer is preferably 0.1 to 0.6 mm, more preferably 0.15 to 0.45 mm, and still more preferably 0.20 to 0.40 mm.
- the lower limit of the thickness of the synthetic resin backer layer is within the above range, the impact resistance of the decorative sheet is further improved.
- the curvature of a decorative sheet is further suppressed because the upper limit of the thickness of the synthetic resin backer layer is within the above range.
- the decorative sheet of the present invention may have a recess (for example, an embossed recess) on the surface protective layer side. By having the concave portion, a high-grade feeling accompanying improvement in the texture (tactile feeling) of the decorative sheet is obtained, and the design properties are improved.
- the concave portion only needs to be present at least in the surface protective layer of the decorative sheet of the present invention, and the depth of the concave portion may remain in the surface protective layer, or may reach the first olefin resin layer. There may be. From the viewpoint of obtaining an excellent texture (tactile sensation), it is preferable to combine not only those that remain in the surface protective layer but also those that reach the second olefin resin layer and those that reach the first olefin resin layer.
- the pattern of the recess is a pattern synchronized with the pattern of the decoration layer.
- the pattern layer is a wood grain pattern
- selecting a wood grain plate conduit groove as the recess pattern, and synchronizing the grain of the pattern layer with the grain of the recess layer it is more realistic and full of quality and has a high-class feeling A decorative sheet is obtained.
- a resin composition for forming a first olefin resin layer is prepared, a first olefin resin layer is formed by a method such as a melt extrusion method, and a decoration layer is formed on the first olefin resin layer. .
- a resin composition for forming the second olefin resin layer is prepared, and the second olefin resin layer is formed by a method such as a melt extrusion method, on the second olefin resin layer, An uncured layer coated with the curable resin composition is cured by applying heat or ionizing radiation to form a surface protective layer.
- an adhesive is applied to at least one surface of the decorative layer and the second olefin resin layer, and is pasted so that the decorative layer and the second olefin resin layer face each other.
- a decorative sheet having a layer, a second olefin resin layer, and a surface protective layer in this order can be produced.
- the second olefin resin layer is formed by using the resin composition to form the second olefin resin layer, and the second olefin resin layer is a method such as extrusion lamination, dry lamination, wet lamination, thermal lamination, etc.
- the adhesive layer and / or a thermoplastic resin such as an acid-modified polyolefin resin are bonded and pressed together to form a laminate, and then a curable resin composition is applied on the second olefin resin layer.
- the decorative layer is formed by applying ink used for forming the decorative layer on the first olefin resin layer and the second olefin resin layer to provide a desired colored layer and pattern layer.
- the ink is applied by a known method such as a gravure printing method, a bar coating method, a roll coating method, a reverse roll coating method, or a comma coating method, preferably a gravure printing method.
- the application of the curable resin composition is preferably a known gravure coat, bar coat, roll coat, reverse roll coat, comma coat, etc. so that the thickness after curing is a predetermined thickness. More preferably, gravure coating is used.
- the uncured resin layer formed by applying the resin composition is irradiated with ionizing radiation such as an electron beam or ultraviolet ray to form a cured product. It becomes a protective layer.
- ionizing radiation such as an electron beam or ultraviolet ray
- the acceleration voltage can be appropriately selected according to the resin to be used and the thickness of the layer, but the uncured resin layer is usually cured at an acceleration voltage of about 70 to 300 kV. preferable.
- the irradiation dose is preferably such that the crosslinking density of the ionizing radiation curable resin is saturated, and is usually selected in the range of 5 to 300 kGy (0.5 to 30 Mrad), preferably 10 to 50 kGy (1 to 5 Mrad).
- the electron beam source is not particularly limited, and for example, various electron beam accelerators such as a cockroft 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 are used. be able to.
- various electron beam accelerators such as a cockroft 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 are used. be able to.
- ultraviolet rays when ultraviolet rays are used as ionizing radiation, those containing ultraviolet rays having a wavelength of 190 to 380 nm are emitted.
- an ultraviolet-ray source For example, a high pressure mercury lamp, a low pressure mercury lamp, a metal halide lamp, a carbon arc lamp, etc. are used.
- the surface protective layer may be formed by applying a heat treatment according to the resin composition to be used and curing it.
- the resin composition for forming the primer layer is applied by a known method such as a gravure printing method, a bar coating method, a roll coating method, a reverse roll coating method, or a comma coating method. Can be formed.
- a synthetic resin backer layer for example, a synthetic resin layer backer layer produced by a T-die extrusion method and the first olefin resin layer are laminated by dry lamination via a thermal laminate or an adhesive. Etc., and can be formed by a known method.
- embossing when forming the recess, it is preferable to employ embossing in consideration of ease of work.
- the embossing may be performed by a normal method using a known single-wafer or rotary embossing machine.
- the decorative plate of the present invention is composed of a laminate comprising, in order in the thickness direction, a decorative plate substrate and the aforementioned decorative sheet of the present invention.
- FIG. 3 shows an example of the decorative board 12 in which the decorative sheet 10 of the present invention (the surface opposite to the surface protective layer side and the decorative board base material 11 are bonded together) is laminated in this order on the decorative board substrate 11. .
- a decorative board base material for example, medium density wood fiber board, high density wood fiber board, particle board, softwood plywood, hardwood plywood, early-wood plywood, cork sheet, cork-containing composite base material, thermoplasticity
- resin plate polyvinyl chloride resin, polypropylene resin, polyethylene resin, acrylic resin, resin plate mainly composed of ABS resin, or foamed material thereof. You may use these decorative board base materials by laminating
- examples of coniferous trees include Japanese pine, Karamatsu, Japanese pine, Japanese cedar, Japanese cypress, pine, Sequoia, and spruce.
- Examples of the broad-leaved tree include lawan, china, hippopotamus, sen, beech, oak, and meranti.
- Examples of early mature trees include poplar, falkata, acacia, chameleon, eucalyptus, terminaria and the like.
- the number of laminated wood plywood is not limited, but usually 3 to 7 is preferable, and 5 to 7 is more preferable.
- the adhesive agent used at the time of wood plywood preparation is not limited, either, The well-known adhesive for woodworking can be used widely.
- adhesives include, for example, 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. Adhesives to be used.
- thermosetting adhesives include melamine-based, phenol-based, urea-based (such as vinyl acetate-urea) adhesives.
- the thickness of the decorative board substrate is not limited, but is preferably about 2 to 15 mm, more preferably about 2 to 12 mm.
- the lamination method for laminating the decorative sheet and the decorative board substrate is not limited, and for example, a method of sticking each with an adhesive or the like can be employed. What is necessary is just to select an adhesive agent suitably from well-known adhesive agents according to the kind etc. of a decorative board base material. For example, reactions such as polyvinyl acetate, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ionomer, urethane-based reactive hot melt (hereinafter referred to as “PUR-based adhesive”) and the like.
- PUR-based adhesive urethane-based reactive hot melt
- Type hot melt adhesive butadiene-acrylonitrile rubber, neoprene rubber, natural rubber and the like. These adhesives are used alone or in combination of two or more.
- the above-mentioned decorative sheet of the present invention has excellent bending workability and scratch resistance even under high load conditions, and is useful as a cosmetic material.
- Indentation hardness (H IT ) By the method described in the specification text, indentation hardness H 1 of the surface protective layer, the indentation hardness H IT 3 of the second indene olefin resin layer station hardness H IT 2 and the first olefin resin layer measured did.
- Scratch resistance test (coin scratch test) A decorative sheet was prepared by adhering the decorative sheets prepared in Examples and Comparative Examples on a medium density fiberboard (MDF; decorative board substrate) having a thickness of 2.5 mm via a water-soluble emulsion adhesive. . The following water-soluble emulsion adhesive was used.
- the evaluation criteria are as follows, and in all cases, B evaluation or higher (that is, A or B) is acceptable. ⁇ Criteria> A: No scratches are observed at 7 kg load B: No scratches are observed at 7 kg load, but no scratches are observed at 6 kg load C: No scratches are observed at 4 kg load, but scratches are observed at 6 kg load (3 ) Bending workability The bending workability of the decorative sheets prepared in Examples and Comparative Examples was evaluated. Specifically, the presence or absence of cracks in the surface protective layer was evaluated when the first olefin layer of the decorative sheet was wound around a metal rod having a diameter of 3 mm. The evaluation criteria are as follows.
- a first olefin resin layer 3 made of a polyethylene sheet having a thickness of 80 ⁇ m and a second olefin resin layer 2 obtained by the following production method were laminated via an adhesive layer.
- a surface protective layer coating solution A having the following composition was applied on the second olefin resin layer 2 by a roll coating method so that the thickness after drying was 15 ⁇ m.
- the surface protective layer 1 was formed by irradiating and curing 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.
- a highly crystalline homopolypropylene resin having an isotactic pentad fraction of 97.8%, an MFR of 15 g / 10 min (230 ° C.), and a molecular weight distribution (Mw / Mn) of 2.3 is a nucleating agent.
- a polypropylene sheet made of microcrystalline homopolypropylene having a thickness of 80 ⁇ m was formed by extruding 1000 ppm of 2′-methylenebis (4,6-ditert-butylphenyl) phosphonate with a melt extruder. .
- Example 2 was conducted in the same manner as in Example 1 except that the amount of the hexafunctional aliphatic urethane acrylate oligomer in the surface protective layer coating solution A was changed to 100 parts by mass and the bifunctional urethane acrylate oligomer was not added. A decorative sheet was prepared.
- Example 3 The same procedure as in Example 1 was carried out except that the blending amount of the bifunctional urethane acrylate oligomer in the surface protective layer coating liquid A was changed to 20 parts by mass and the blending amount of the hexafunctional aliphatic urethane acrylate oligomer was changed to 80 parts by mass. A decorative sheet of Example 3 was prepared.
- Example 4 As the second olefin resin layer 2 of Example 1, a decorative sheet of Example 4 was produced in the same manner as Example 1 except that the addition amount of the nucleating agent was 2000 ppm.
- Example 5 The blending amount of the bifunctional urethane acrylate oligomer in the surface protective layer coating liquid A was changed to 20 parts by mass, the blending amount of the hexafunctional aliphatic urethane acrylate oligomer was changed to 80 parts by mass, and the addition amount of the nucleating agent was 2000 ppm.
- a decorative sheet of Example 5 was produced in the same manner as Example 1 except for the above.
- Comparative Example 1 As the second olefin resin layer 2 of Example 1, polypropylene extruded by a melt extruder without adding 1000 ppm of 2,2′-methylenebis (4,6-ditert-butylphenyl) phosphonate sodium as a nucleating agent A decorative sheet of Comparative Example 1 was produced in the same manner as in Example 1 except that the sheet was used.
- Comparative Example 2 Polypropylene extruded as a second olefin resin layer 2 of Example 3 with a melt extruder without adding 1000 ppm of sodium 2,2′-methylenebis (4,6-ditert-butylphenyl) phosphonate as a nucleating agent A decorative sheet of Comparative Example 2 was produced in the same manner as Example 3 except that the sheet was used.
- the decorative sheets of Examples 1 to 5 are excellent in scratch resistance under high load conditions and have excellent bending workability. Further, by comparing Examples 1 to 3 and Examples 4 to 5, the indentation hardness H IT 2 of the second olefin resin layer 2 is set to 100 MPa or more and less than 140 MPa (preferably 130 MPa or less). In addition to excellent scratch resistance and bending workability, it can be confirmed that an excellent effect is also obtained in terms of DuPont impact resistance and stain resistance after DuPont impact.
- the decorative sheet of the present invention is excellent in scratch resistance under high load conditions and has excellent bending workability, and can be used as a surface material for building materials, particularly for flooring decorative materials.
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Abstract
Description
1.第一オレフィン樹脂層、第二オレフィン樹脂層、及び表面保護層をこの順に有する化粧シートにおいて、
前記第二オレフィン樹脂層のインデンテーション硬さHIT 2と前記表面保護層のインデンテーション硬さHIT 1とが下記式(1)及び(2);
HIT 2 ≧ 100MPa (1)
HIT 1 > HIT 2 (2)
を満たすことを特徴とする化粧シート。
2.前記表面保護層のインデンテーション硬さHIT 1が下記式(3);
450MPa > HIT 1 (3)
を満たす、上記項1に記載の化粧シート。
3.前記第二オレフィン樹脂層のインデンテーション硬さHIT 2と前記第一オレフィン樹脂層のインデンテーション硬さHIT 3とが下記式(4);
HIT 2 > HIT 3 (4)
を満たす、上記項1又は2に記載の化粧シート。
4.前記第二オレフィン樹脂層は、微結晶化オレフィン樹脂層である、上記項1~3のいずれかに記載の化粧シート。
5.前記表面保護層は、平均粒子径10μm以下の無機微粒子を含有する、上記項1~4のいずれかに記載の化粧シート。
6.厚さ方向において順に、化粧板基材と、上記項1~5のいずれかに記載の化粧シートとを備える積層体から構成される化粧板。
以下、本発明の化粧シート及び化粧板について詳細に説明する。
(化粧シート)
本発明の化粧シート10は、図1に図示の如く第一オレフィン樹脂層3、第二オレフィン樹脂層2、及び表面保護層1をこの順に有する化粧シートであって、
第二オレフィン樹脂層2のインデンテーション硬さHIT 2と表面保護層1のインデンテーション硬さHIT 1とが下記式(1)及び(2);
HIT 2 ≧ 100MPa (1)
HIT 1 > HIT 2 (2)
を満たすことを特徴とする。
(インデンテーション硬さ)
本明細書において、各層の「インデンテーション硬さ」は、表面皮膜物性試験機トライボインデンター(登録商標)「TI-950」(HYSITRON社製)を用いて測定されるナノインデンテーション硬さで示す。
(1)図4(a)に示されるバーコビッチ圧子を用いて、図4(b)に示すように測定試料にバーコビッチ圧子を後述の押込み条件にて押込み、表面にできた三角錘型の幾何学的形状から、「装置標準の方法で補正した接触投影面積(Ap)(mm2)」を計算し、最大試験荷重(Fmax)を前記Apで除することにより硬さを求める。
(2)ここで、押込み条件は、第一オレフィン樹脂層及び第二オレフィン樹脂層については、室温(実験室環境温度)において、図4(c)に示される通り、先ず0~50μNまでの負荷を5秒間で加え(すなわち10μN/s)、次に50μN(Fmax)の負荷で5秒間保持し、最後に50~0μNまでの除荷を10秒間で行う。また、表面保護層については、先ず0~100μNまでの負荷を10秒間で加え(すなわち10μN/s)、次に100μN(Fmax)の負荷で5秒間保持し、最後に100~0μNまでの除荷を10秒間で行う。通常、押し込み量(h)は100~150nm程度であるため、測定試料となる層の押し込み方向の厚さは1.0μm以上(好適には1.5μm以上)であればよい。
(3)なお、硬さの測定に際し、測定試料となる層以外の層の硬さの影響を回避するために測定対象の層の断面の硬さを測定する。すなわち、化粧シートを樹脂(冷間硬化タイプのエポキシ2液硬化樹脂)で包埋し、室温で24時間以上放置して硬化させた後、硬化した埋包サンプルを機械研磨して測定対象の層の断面を露出させ、測定対象の層の断面(充填材等の微粒子が層中に含まれる場合には当該微粒子を避けた位置)に上記バーコビッチ圧子を押込むことにより各層の断面の硬さを測定する。
(4)各層について、それぞれ偏りが生じないように10箇所のインデンテーション硬さを測定し、10箇所の平均値をそれぞれ「表面保護層のインデンテーション硬さHIT 1」、「第二オレフィン樹脂層のインデンテーション硬さHIT 2」及び「第一オレフィン樹脂層のインデンテーション硬さHIT 3」とする。
HIT 1 > HIT 2 (2)
なお、表面保護層のインデンテーション硬さHIT 1は、比較的高荷重での耐擦傷性を発揮させるという理由から第二オレフィン樹脂層のインデンテーション硬さHIT 2よりも大きい必要があり、且つ100MPa超過である。
450MPa > HIT 1 (3)
を満たすことが好ましい。
HIT 2 > HIT 3 (4)
を満たすことが好ましい。
(第一オレフィン樹脂層)
第一オレフィン樹脂層は、オレフィン樹脂からなる層であり、オレフィン樹脂としては、例えば、エチレン、プロピレン、ブテン等のオレフィンの単独重合体;エチレン-プロピレンのブロック共重合体、ランダム共重合体;エチレン及びプロピレンの少なくとも一種と、ブテン、ペンテン、ヘキセン等の少なくとも一種の他のオレフィンとの共重合体;エチレン及びプロピレンの少なくとも一種と、酢酸ビニル、ビニルアルコール等の少なくとも一種の他の単量体との共重合体;等が挙げられる。なかでも、優れた耐擦傷性と良好な曲げ加工性とを得る観点から、ポリエチレン、ポリプロピレンが好ましく、特にポリエチレンが好ましい。
(第二オレフィン樹脂層)
第二オレフィン樹脂層は、オレフィン樹脂からなる層であり、そのインデンテーション硬さHIT 2が上記式(1)及び(2)を満足することを要する層である。
HIT 1 > HIT 2 (2)
HIT 2 > HIT 3 (4)
第二オレフィン樹脂層のインデンテーション硬さHIT 2は、耐擦傷性及び曲げ加工性のバランスの観点から、100MPa以上200MPa以下が好ましく、105MPa以上150MPa以下がより好ましく、110MPa以上130MPa以下が更に好ましい。
Dnp:数平均分子量
di:ヒストグラムのi番目の直径
ni:頻度
本発明において、ナノシェルの平均一次粒子径は、可視光の波長領域(380~750nm)未満であり、また可視光の波長の1/2以下程度である、すなわち、380nm未満であることが好ましく、より具体的には、1nm以上380nm未満が好ましく、1~375nmがより好ましく、5~300nmが更に好ましく、10~250nmがより更に好ましく、15~200nmが特に好ましい。平均一次粒子径が上記範囲内にあると、より容易に第二オレフィン樹脂層のインデンテーション硬さを調節でき、優れた耐擦傷性と曲げ加工性とを得ることができる。
(表面保護層)
表面保護層は、図1及び2に示されるように、化粧シートの最表面に設けられて外面に露出する層であり、化粧シートの耐汚染性、耐擦傷性、耐薬品性等の表面特性を向上させるために設けられる。また、表面保護層は、そのインデンテーション硬さHIT 1が、下記式(2)を満足することを要する。
表面保護層のインデンテーション硬さHIT 1は、比較的高荷重での耐擦傷性を発揮させるという理由から第二オレフィン樹脂層のインデンテーション硬さHIT 2よりも大きい必要があり、且つ100MPa超過である。
なお、前述したインデンテーション硬さHIT 1の上限及び下限の多段階の好適な範囲は、それぞれ組み合わせることが可能である。例えば下限の最大値と、上限の最大値とを組み合わせてHIT 1の範囲を350MPa以上450MPa未満とすることができる。
(その他の層)
本発明の化粧シートは、上記の第一オレフィン樹脂層、第二オレフィン樹脂層及び表面保護層の他、用途に応じて、例えば、装飾層、プライマー層、接着剤層等を有することができる。
(装飾層)
本発明の化粧シートは、意匠性を向上させる観点から、装飾層を有することができる。装飾層は、例えば、第一オレフィン樹脂層と第二オレフィン樹脂層との間、又は第二オレフィン樹脂層と表面保護層との間、表面保護層上等に設けることができる。
(プライマー層)
プライマー層は、主に各層の密着性の向上を図るために設けられる層である。
(合成樹脂製バッカー層)
本発明の化粧シートは、化粧シートの最下層、すなわち化粧シートの第一オレフィン樹脂層側に合成樹脂製バッカー層を備えていてもよい。合成樹脂製バッカー層を備えることにより、化粧材の耐衝撃性がより一層向上する。
(凹部)
本発明の化粧シートは、表面保護層側に凹部(例えば、エンボス加工凹部)を有してもよい。凹部を有することで、化粧シートの質感(触感)の向上に伴う高級感が得られ、意匠性が向上する。
(化粧シートの製造方法)
本発明の化粧シートの製造方法について、本発明の化粧シートとして好ましい態様の一つである、厚さ方向において、第一オレフィン樹脂層、装飾層、第二オレフィン樹脂層、及び表面保護層を順に有する化粧シートを例にとって、その製造方法の一例を説明する。
本発明の化粧板は、厚さ方向において順に、化粧板基材と、前述の本発明の化粧シートとを備える積層体から構成される。
<評価方法>
(1)インデンテーション硬さ(HIT)
明細書本文に記載の方法により、表面保護層のインデンテーション硬さHIT 1、第二オレフィン樹脂層のインデンテーション硬さHIT 2及び第一オレフィン樹脂層のインデンテーション硬さHIT 3を測定した。
(2)耐擦傷性試験(コインスクラッチ試験)
実施例及び比較例で作製した化粧シートを、厚みが2.5mmの中密度繊維板(MDF;化粧板基材)上に水溶性エマルション系接着剤を介して接着することにより化粧板を作製した。なお、水溶性エマルション系接着剤は、以下のものを用いた。
・水溶性エマルション系接着剤
主剤:「BA-10L」ジャパンコーティングレジン株式会社製、変性エチレン・酢酸ビニル系
硬化剤:「BA-11B」ジャパンコーティングレジン株式会社製、イソシアネート系
配合比 主剤:硬化剤=100:2.5(質量比)
その化粧板を用いて、コインスクラッチ試験により耐擦傷性を評価した。具体的には、45°に傾けた10円硬貨2枚を試験片化粧シート表面(表面保護層側)に接触させ、荷重(4kg荷重、6kg荷重及び7kg荷重)を加えながら水平方向に引き摺った際の傷付き状態を評価した。評価基準は、以下の通りであり、いずれもB評価以上(つまり、A又はB)が合格である。
<判定基準>
A:7kg荷重において傷が認められない
B:7kg荷重では傷が認められるが、6kg荷重において傷が認められない
C:4kg荷重では傷が認められないが、6kg荷重で傷が認められる
(3)曲げ加工性
実施例及び比較例で作製した化粧シートの曲げ加工性を評価した。具体的には、直径3mmの金属棒に化粧シートの第一オレフィン層が接するように巻きつけた際に、表面保護層の亀裂の有無を評価した。評価基準は、以下の通りである。
<判定基準>
A:亀裂が視認できない
B:注意深く観察すれば微小な亀裂がわずかに視認されるが、性能上問題ない範囲
C:亀裂が明確に視認できる
(4)耐衝撃性(デュポン衝撃試験)
実施例及び比較例で作製した化粧板の耐衝撃性を、デュポン衝撃試験機(JIS K5600-5-3に準拠)を用いて評価した。具体的には、100mmの高さから規定重量の錘を化粧板の化粧シート表面に落下させて化粧シートに割れが生ずるか否かを評価した。評価基準は、以下の通りである。
A:割れが視認できない
B:注意深く観察すれば微小な割れが視認できる
C:割れが明確に視認できる
(5)デュポン衝撃試験後の耐汚染性
実施例及び比較例で作製した化粧シートについて、下記の方法で耐汚染性を評価した。
(4)の試験実施部分に油性黒マジック(寺西化学工業(株)製)を塗布し、直後に溶剤(エタノール)で拭取った後の黒マジックの残存具合を目視により評価した。評価基準は、以下の通りである。
A:汚染残りが視認できない
B:注意深く観察すれば微小な汚染残りが視認できる
C:明確に汚染が視認できる
実施例1
第一オレフィン樹脂層3、第二オレフィン樹脂層2、及び表面保護層1がこの順に積層されてなる化粧シート10を作製した。
<第二オレフィン樹脂層2の作製方法>
アイソタクチックペンタッド分率が97.8%、MFRが15g/10min(230℃)、分子量分布(Mw/Mn)が2.3の高結晶性ホモポリプロピレン樹脂に、造核剤である2,2’-メチレンビス(4,6-ジ第三ブチルフェニル)ホスホン酸ナトリウム1000ppmを添加したものを溶融押出機で押出すことにより、厚さ80μmの微結晶化ホモポリプロピレンからなるポリプロピレンシートを製膜した。
<表面保護層塗工液A>
・2官能ウレタンアクリレートオリゴマー 80質量部
(ポリオール成分がポリエステルジオール、ガラス転移点:25℃、分子量1500)
・6官能脂肪族ウレタンアクリレートオリゴマー 20質量部
(ガラス転移点:200℃以上、分子量1500、共栄社化学株式会社製UA306H)
・無機微粒子 14質量部
(平均粒子径10μmのシリカ微粒子)
実施例2
表面保護層塗工液Aの6官能脂肪族ウレタンアクリレートオリゴマーの配合量を100質量部に変更し、2官能ウレタンアクリレートオリゴマーを配合しなかった以外は、実施例1と同様にして、実施例2の化粧シートを作製した。
表面保護層塗工液Aの2官能ウレタンアクリレートオリゴマーの配合量を20質量部、6官能脂肪族ウレタンアクリレートオリゴマーの配合量を80質量部に変更した以外は、実施例1と同様にして、実施例3の化粧シートを作製した。
実施例1の第二オレフィン樹脂層2として、造核剤の添加量を2000ppmとした以外は実施例1と同様にして、実施例4の化粧シートを作製した。
表面保護層塗工液Aの2官能ウレタンアクリレートオリゴマーの配合量を20質量部、6官能脂肪族ウレタンアクリレートオリゴマーの配合量を80質量部に変更し、更に造核剤の添加量を2000ppmとした以外は実施例1と同様にして、実施例5の化粧シートを作製した。
実施例1の第二オレフィン樹脂層2として、造核剤である2,2’-メチレンビス(4,6-ジ第三ブチルフェニル)ホスホン酸ナトリウム1000ppmを添加せずに溶融押出機で押出したポリプロピレンシートを用いた以外は実施例1と同様にして、比較例1の化粧シートを作製した。
実施例3の第二オレフィン樹脂層2として、造核剤である2,2’-メチレンビス(4,6-ジ第三ブチルフェニル)ホスホン酸ナトリウム1000ppmを添加せずに溶融押出機で押出したポリプロピレンシートを用いた以外は実施例3と同様にして、比較例2の化粧シートを作製した。
2 第二オレフィン樹脂層
3 第一オレフィン樹脂層
4 凹部(エンボス加工凹部)
10 化粧シート
11 化粧板基材
12 化粧板
20 測定試料
21 バーコビッチ圧子
22 荷重をかける方向
Claims (6)
- 第一オレフィン樹脂層、第二オレフィン樹脂層、及び表面保護層をこの順に有する化粧シートにおいて、
前記第二オレフィン樹脂層のインデンテーション硬さHIT 2と前記表面保護層のインデンテーション硬さHIT 1とが下記式(1)及び(2);
HIT 2 ≧ 100MPa (1)
HIT 1 > HIT 2 (2)
を満たすことを特徴とする化粧シート。 - 前記表面保護層のインデンテーション硬さHIT 1が下記式(3);
450MPa > HIT 1 (3)
を満たす、請求項1に記載の化粧シート。 - 前記第二オレフィン樹脂層のインデンテーション硬さHIT 2と前記第一オレフィン樹脂層のインデンテーション硬さHIT 3とが下記式(4);
HIT 2 > HIT 3 (4)
を満たす、請求項1又は2に記載の化粧シート。 - 前記第二オレフィン樹脂層は、微結晶化オレフィン樹脂層である、請求項1~3のいずれかに記載の化粧シート。
- 前記表面保護層は、平均粒子径20μm以下の無機微粒子を含有する、請求項1~4のいずれかに記載の化粧シート。
- 厚さ方向において順に、化粧板基材と、請求項1~5のいずれかに記載の化粧シートとを備える積層体から構成される化粧板。
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WO2021066035A1 (ja) * | 2019-09-30 | 2021-04-08 | 大日本印刷株式会社 | 床用化粧材 |
JP2021084407A (ja) * | 2019-11-29 | 2021-06-03 | 凸版印刷株式会社 | 化粧シート及び化粧シートの製造方法 |
WO2021182583A1 (ja) * | 2020-03-11 | 2021-09-16 | 大日本印刷株式会社 | 化粧シート及び化粧板 |
JP2022189905A (ja) * | 2017-02-28 | 2022-12-22 | 大日本印刷株式会社 | 化粧シート及び化粧板 |
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JP2022189905A (ja) * | 2017-02-28 | 2022-12-22 | 大日本印刷株式会社 | 化粧シート及び化粧板 |
JP7444220B2 (ja) | 2017-02-28 | 2024-03-06 | 大日本印刷株式会社 | 化粧シート |
JP2020185774A (ja) * | 2019-05-17 | 2020-11-19 | 凸版印刷株式会社 | 着色シート、化粧シート及びその製造方法 |
JP7326862B2 (ja) | 2019-05-17 | 2023-08-16 | 凸版印刷株式会社 | 着色シート、化粧シート及びその製造方法 |
JP7491165B2 (ja) | 2019-09-26 | 2024-05-28 | 大日本印刷株式会社 | 化粧シート及び化粧材 |
WO2021066035A1 (ja) * | 2019-09-30 | 2021-04-08 | 大日本印刷株式会社 | 床用化粧材 |
JP2021084407A (ja) * | 2019-11-29 | 2021-06-03 | 凸版印刷株式会社 | 化粧シート及び化粧シートの製造方法 |
WO2021182583A1 (ja) * | 2020-03-11 | 2021-09-16 | 大日本印刷株式会社 | 化粧シート及び化粧板 |
JP6954505B1 (ja) * | 2020-03-11 | 2021-10-27 | 大日本印刷株式会社 | 化粧シート及び化粧板 |
Also Published As
Publication number | Publication date |
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JP2022189905A (ja) | 2022-12-22 |
EP3590710A1 (en) | 2020-01-08 |
EP3590710B1 (en) | 2024-03-27 |
EP3590710A4 (en) | 2020-11-11 |
CN110352132A (zh) | 2019-10-18 |
JP7163905B2 (ja) | 2022-11-01 |
JPWO2018159660A1 (ja) | 2019-12-19 |
US11999144B2 (en) | 2024-06-04 |
KR102479216B1 (ko) | 2022-12-19 |
JP7444220B2 (ja) | 2024-03-06 |
PT3590710T (pt) | 2024-05-08 |
US20200055295A1 (en) | 2020-02-20 |
KR20190124719A (ko) | 2019-11-05 |
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