Decorative sheet and decorative panel using biomass-derived polyethylene

Abstract

The present application provides a decorative sheet or the like using biomass-derived polyethylene, which is capable of suppressing discoloration of a pattern and is also excellent in durability. The decorative sheet using biomass-derived polyethylene of the present application has: a base sheet containing biomass-derived polyethylene and having a first face and a second face; a pattern auxiliary layer laminated on the first face side of the base sheet, covering the entire first face of the base sheet; and a pattern layer constituting a pattern, laminated on the face side of the pattern auxiliary layer opposite to the base sheet, the base sheet containing a phenol-based antioxidant.

Description

Technical Field

[0001] This invention relates to decorative sheets and panels using polyethylene derived from biomass. Background Technology

[0002] In building materials, furniture, and home appliances, when you want to decorate the components you use, you usually use decorative panels that have been fitted with designed decorative pieces.

[0003] For example, Patent Document 1 discloses a decorative sheet characterized by having at least a surface protective layer on a substrate sheet, the surface protective layer being composed of a resin composition containing an ionizing radiation-curable resin, an aldehyde adsorbent, and a photocatalyst-free resin.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2013-063635 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] The base material of decorative panels used in building materials and the like uses plastic as its main component. This plastic is usually petroleum-derived, but this is not preferred from the viewpoint of reducing environmental impact. Among these, biomass-derived plastics, which use renewable biological resources as raw materials, are known as raw materials for plastics with a lower environmental impact than petroleum-derived plastics.

[0009] The inventors of this invention have repeatedly studied the technology of incorporating biomass-derived polyethylene film into decorative sheets used in building materials, etc., and have found that: because biomass-derived polyethylene film contains more impurities than petroleum-derived polyethylene film, it is prone to defects caused by the contamination of impurities, known as "fish eyes." Areas with fish eyes exhibit reduced adhesion to resin compared to areas without fish eyes.

[0010] Therefore, the following technical problem was found: when using biomass-derived polyethylene film as the substrate of decorative sheets, the pattern applied to the patterned layer may fade due to the effect of fisheye, resulting in poor appearance and failure to perform its function as a decorative sheet.

[0011] Pattern layers used to create a wide variety of designs require localized and overlapping color (coloring ink containing colorants), resulting in edge areas of the colored portions (areas containing coloring ink) and / or areas where the colored portions (areas containing coloring ink) overlap. When these areas overlap with poorly adhered fisheye patterns, color fading is particularly likely, and defects in the pattern become especially noticeable, thus severely compromising the quality of the decorative sheet.

[0012] The inventors of this invention discovered that by including antioxidants in biomass-derived polyethylene, the effects of fish-eye problems can be suppressed.

[0013] However, the following new technical problem has also been discovered: when phosphorus-based antioxidants are contained alone in biomass-derived polyethylene, the effect of fish eyes is suppressed, but when it is used as the base material for decorative sheets, the durability of the decorative sheets is reduced.

[0014] Therefore, the present invention is an invention that solves the above-mentioned technical problems discovered when introducing biomass-derived polyethylene into decorative sheets for building materials, etc.

[0015] Technical solutions for solving technical problems

[0016] By incorporating phenolic antioxidants into a substrate sheet containing biomass-derived polyethylene and then laminating a patterned auxiliary layer over the entire first side of the substrate sheet, it is possible to suppress the reduction in the durability of the decorative sheet and to suppress the fading of the patterned design layer laminated on the first side of the substrate sheet.

[0017] That is, the present invention relates to a decorative sheet using biomass-derived polyethylene, comprising: a substrate sheet comprising biomass-derived polyethylene and having a first side and a second side; a pattern auxiliary layer laminated on the first side of the substrate sheet, covering the entire first side of the substrate sheet; and a pattern pattern layer constituting a pattern pattern, laminated on the opposite side of the pattern auxiliary layer to the substrate sheet, wherein the substrate sheet contains a phenolic antioxidant.

[0018] In the decorative sheet of the present invention using biomass-derived polyethylene, the phenolic antioxidant preferably includes a hindered phenolic antioxidant.

[0019] The aforementioned substrate sheet preferably also contains a phosphorus-based antioxidant.

[0020] Preferably, in the above-mentioned substrate sheet, the mass ratio of the phenolic antioxidant to the phosphorus antioxidant is 1:1 to 1:2.

[0021] Preferably, the thickness of the above-mentioned patterned auxiliary layer is more than 1 μm and less than 5 μm.

[0022] Preferably, the above-mentioned patterned auxiliary layer is subjected to a smoothing process.

[0023] Preferably, a back adhesive auxiliary layer is provided, which is stacked on the second side of the substrate sheet and covers the entire second side of the substrate sheet.

[0024] Preferably, the content of nitrocellulose in the back adhesive auxiliary layer is less than 5% by mass.

[0025] Preferably, a transparent resin layer is stacked on the side opposite to the pattern auxiliary layer of the pattern pattern layer, and the thickness of the transparent resin layer is 40 μm or more and 100 μm or less.

[0026] Preferably, the transparent resin layer comprises an olefin-based resin.

[0027] The present invention also relates to a decorative panel having an adhesive material laminated on the second side of the substrate sheet of the aforementioned decorative sheet using biomass-derived polyethylene.

[0028] Invention Effects

[0029] The present invention provides a decorative sheet using biomass-derived polyethylene, which can suppress the fading of patterns caused by fisheye even when using biomass-derived polyethylene, and also has excellent durability. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view schematically illustrating a preferred example of a decorative sheet using biomass-derived polyethylene according to the present invention.

[0031] Figure 2 This is a cross-sectional view schematically illustrating a preferred example of a decorative sheet using biomass-derived polyethylene according to the present invention. Detailed Implementation

[0032] Decorative panels using biomass-derived polyethylene

[0033] The decorative sheet of the present invention using biomass-derived polyethylene will be described below.

[0034] The decorative sheet of the present invention using biomass-derived polyethylene comprises: a substrate sheet containing biomass-derived polyethylene and having a first side and a second side; a pattern auxiliary layer laminated on the first side of the substrate sheet, covering the entire first side of the substrate sheet; and a pattern pattern layer constituting a pattern pattern, laminated on the opposite side of the pattern auxiliary layer to the substrate sheet, wherein the substrate sheet contains a phenolic antioxidant.

[0035] Figure 1 This is a cross-sectional view schematically illustrating a preferred example of a decorative sheet using biomass-derived polyethylene according to the present invention.

[0036] like Figure 1 As shown, the decorative sheet 10 of the present invention using biomass-derived polyethylene has a patterned layer 3 laminated on the first side of the substrate sheet 1.

[0037] Additionally, it includes a substrate sheet 1; a patterned auxiliary layer 2 laminated on the first side of the substrate sheet 1 and covering the entire first side of the substrate sheet 1; and a patterned pattern layer 3 laminated on the opposite side of the patterned auxiliary layer 2 to the substrate sheet 1.

[0038] In addition, it is preferable to have a back adhesive auxiliary layer 4 that is laminated on the second side of the substrate sheet 1 and covers the entire second side of the substrate sheet 1.

[0039] Figure 2 This is a cross-sectional view schematically illustrating a preferred example of a decorative sheet using biomass-derived polyethylene according to the present invention. Figure 2 As shown, in decorative piece 10, besides Figure 1 In addition to the layers shown, a back bonding auxiliary layer 4 may be laminated on the second side of the substrate sheet 1, or an adhesive layer 5, a transparent resin layer 6, a surface bonding auxiliary layer 7 and a surface protective layer 8 may be laminated sequentially on the pattern layer 3.

[0040] (Substrate sheet)

[0041] The decorative sheet uses a substrate sheet containing biomass-derived polyethylene and having a first side and a second side.

[0042] The first side is the side of the substrate sheet on which the patterned layer is formed (also called the surface), and the second side is the side of the substrate sheet opposite to the first surface (the side on which the laminated material is adhered, also called the back side).

[0043] "Biomass-derived polyethylene" refers to polyethylene for which at least a portion of the raw materials are biomass-derived, not necessarily meaning that all raw materials are biomass-derived.

[0044] It should be noted that whether or not biomass-derived raw materials are used can be determined based on the radiocarbon (C14) determination recorded in the "Biomass Ratio" section below.

[0045] The substrate sheet may be, for example, biomass polyethylene, which is a polymer containing ethylene monomers derived from biomass.

[0046] The preferred biomass content of the substrate sheet is 15% or higher.

[0047] By ensuring that the biomass ratio is above 15%, the reliance on fossil fuels can be appropriately reduced, thus mitigating the environmental impact.

[0048] From the viewpoint of being able to more appropriately reduce the environmental impact, the biomass ratio is more preferably 30% or more, further preferably 45% or more, and particularly preferably 60% or more.

[0049] It should be noted that, considering the presence of additives and other materials in the substrate sheet (described later), the upper limit for the biomass ratio is, for example, 70%.

[0050] The "biomass ratio" (the carbon concentration of biomass in a polyethylene substrate sheet containing biomass) is a value obtained by measuring the carbon content of biomass using radiocarbon (C14) determination. It is known that atmospheric carbon dioxide contains a certain proportion (105.5 pMC) of C14, therefore, plants that grow by absorbing atmospheric carbon dioxide, such as corn, also contain approximately 105.5 pMC of C14. Furthermore, it is known that fossil fuels contain almost no C14. Therefore, by measuring the proportion of C14 contained in all carbon atoms in polyethylene, the proportion of carbon from biomass can be calculated.

[0051] That is, when the C14 content in polyethylene is set as P C14 In the case of biomass sources, the carbon content P bio It can be obtained as shown below.

[0052] P bio (%) = P C14 / 105.5×100

[0053] The substrate sheet can be, for example, at least one selected from high-density polyethylene, medium-density polyethylene, low-density polyethylene, or linear low-density polyethylene. Alternatively, it can be a mixture obtained by blending two or more selected from high-density polyethylene, medium-density polyethylene, low-density polyethylene, or linear low-density polyethylene.

[0054] The substrate sheet preferably contains phenolic antioxidants.

[0055] By incorporating a phenolic antioxidant into the substrate sheet and adding a patterned auxiliary layer laminated to and covering the entire first side of the substrate sheet, defects caused by fisheyes can be reduced, and color fading of the pattern can be suppressed. Free radicals generated during substrate sheet molding, such as heat, can trigger oxidation reactions, leading to gelation and coking, which are the causes of fisheyes in the substrate sheet. Since phenolic antioxidants can inhibit oxidation by capturing free radicals, they effectively reduce defects caused by fisheyes in the substrate sheet.

[0056] The aforementioned phenolic antioxidant preferably includes a hindered phenolic antioxidant. Since the polyethylene constituting the substrate sheet undergoes a relatively slow oxidation reaction, the hindered phenolic antioxidant, with its slower reaction rate with free radicals, effectively inhibits this oxidation.

[0057] As hindered phenolic antioxidants, examples include hindered phenolic antioxidants such as pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, thiodiethylidene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, N,N'-hexane-1,6-dimethylbis[3-(3,5-di-tert-butyl-4-hydroxyphenylpropionamide)], 2,4-dimethyl-6-(1-methylpentadecanyl)phenol, [[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl] phosphate diethyl ester, and 3,3',3”,5,5',5”-hexa-tert-butyl-α ,a',a”-(trimethylbenzyl-2,4,6-triyl)tri-p-cresol, 4,6-bis(octylthiomethyl)o-cresol, ethylene bis(oxyethylene)bis[3-(5-tert-butyl-4-hydroxym-tolyl)propionate], hexamethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazine-2-ylamino)phenol, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate, etc.

[0058] The substrate sheet may contain antioxidants other than phenolic antioxidants.

[0059] Examples of such antioxidants include amine-based, sulfur-based, and phosphorus-based antioxidants.

[0060] In addition, when the substrate contains phenolic antioxidants, discoloration will occur due to the oxidation of phenolic antioxidants. However, by also containing phosphorus-based antioxidants, the oxidation of phenolic antioxidants can be inhibited, thereby suppressing discoloration.

[0061] Examples of phosphorus-based antioxidants include triphenyl phosphite, tris(2,4-tert-butylphenyl)phosphite, bis[2,4-bis(1,1-dimethylethyl)-6-methylphenyl]ethyl phosphite, bis(2,4-tert-butylphenyl)pentaerythritol diphosphite, tetra(2,4-di-tert-butylphenyl)[1,1-biphenyl]-4,4'-dimethylbisphosphite, tetra(alkyl group with more than C12 and less than C15)-4,4'-isopropyldiphenyldiphosphite, 3,9-bis(2,6-tert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5,5-undecane], and 1,1'-biphenyl-4,4'-dimethylbis[bis(2,4-di-tert-butylphenyl)phosphite].

[0062] The antioxidant content, based on the mass of the substrate sheet, is preferably 0.01% by mass or more and 0.2% by mass or less. It should be noted that the presence of antioxidants in the substrate sheet can be confirmed, for example, by liquid chromatography.

[0063] When using both phenolic and phosphorus-based antioxidants, the mass ratio of phenolic to phosphorus-based antioxidants (phenolic antioxidant: phosphorus-based antioxidant) is preferably 1:1 or more and 1:2 or less. This can appropriately reduce defects caused by fisheyes in the substrate sheet and appropriately suppress discoloration of the substrate sheet.

[0064] The substrate sheet may also contain various additives such as colorants, fillers, matting agents, foaming agents, flame retardants, lubricants, antistatic agents, ultraviolet absorbers, and light stabilizers, as needed.

[0065] It should be noted that, based on the mass of the substrate sheet, the content of the additives used as needed is preferably 20% by mass or more and 40% by mass or less.

[0066] The thickness of the substrate sheet is preferably 50 μm to 100 μm. By ensuring a thickness of 50 μm or more, the proportion of biomass-derived raw materials in the decorative sheet made of biomass-derived polyethylene can be sufficiently ensured, thus appropriately reducing the environmental impact. Furthermore, shrinkage during the formation of the pattern layer and pattern auxiliary layer described later can be suppressed. Conversely, by ensuring a thickness of 100 μm or less, the amount of fossil fuel-derived raw materials used in the substrate sheet can be reduced, thus appropriately reducing the environmental impact.

[0067] The thickness is more preferably 60μm or more and 80μm or less.

[0068] There are no particular limitations on the specific method for forming a film (making a sheet) from a substrate sheet. Examples include the T-die method, which uses a T-die to extrude molten resin and then laminates it; the calendering method; and the circular die method (blowing method, tubular method). Among these, the T-die method is preferred when it is desirable to improve production efficiency (production speed) or to alleviate internal stress during sheet production. The calendering method is preferred when it is desirable to make the substrate sheet uniform in thickness or to reduce foreign matter defects.

[0069] (Pattern auxiliary layer)

[0070] The decorative sheet has a substrate sheet and a patterned auxiliary layer that is laminated on the first side of the substrate sheet and covers the entire first side of the substrate sheet.

[0071] Because of this patterned auxiliary layer, fisheye defects on the first side of the substrate sheet can be appropriately repaired, and fading of the pattern overlaid on the patterned pattern layer can be suppressed. It should be noted that the patterned auxiliary layer only needs to evenly cover the entire first surface; it does not need to completely cover the entire first surface. Sometimes, unavoidable minor defects such as pinholes may occur during the formation of the patterned auxiliary layer.

[0072] The patterned auxiliary layer covering the entire first surface of the substrate sheet can be formed by gravure printing using a gravure roller. The ink used to form the patterned auxiliary layer contains resin and liquid components. The ink may also be appropriately mixed with colorants such as pigments or dyes, extender pigments, stabilizers, plasticizers, catalysts, curing agents, etc.

[0073] As a resin component, there are no particular limitations. For example, any resin selected from polyurethane resins, acrylic resins, ester resins, amide resins, butyral resins, styrene resins, cellulose acetate resins, acrylic-polyurethane resins, vinyl chloride-vinyl acetate copolymer resins, vinyl chloride-vinyl acetate-acrylic copolymer resins, chlorinated polypropylene resins, etc., can be used alone or in combination with two or more. As a liquid component, organic solvents such as methyl ethyl ketone, toluene, cyclohexanone, ethyl acetate alcohol, ethanol, methanol, and water can be used.

[0074] The pattern auxiliary layer is preferably smoothed using a smoothing roller after full-coat printing with a gravure roller. Alternatively, the pattern auxiliary layer is preferably smoothed by setting the transport speed of the substrate sheet and the outer peripheral rotation speed of the gravure roller to different speeds. By performing a smoothing treatment, a more uniform pattern auxiliary layer can be formed.

[0075] The textured auxiliary layer is preferably 1 μm to 5 μm thick. Since it can appropriately repair defects caused by fisheyes in the substrate sheet, it can appropriately suppress the fading of the textured pattern. More preferably, the textured auxiliary layer is 1.5 μm to 3 μm thick.

[0076] (Pattern layer)

[0077] The decorative sheet has a pattern layer that forms the pattern on the opposite side of the substrate sheet, which is stacked on the pattern auxiliary layer.

[0078] The aforementioned pattern layer is the layer that gives the decorative piece the desired pattern (design), and there are no limitations on the types of patterns. For example, wood grain patterns, stone grain patterns, sand grain patterns, tile patterns, bricklaying patterns, fabric patterns, leather patterns, geometric shapes, text, symbols, abstract patterns, etc.

[0079] The inks used to form the patterned layers contain colorant, resin, and liquid components. The inks may also be appropriately mixed with extender pigments, solvents, stabilizers, plasticizers, catalysts, curing agents, etc.

[0080] As a colorant component, inorganic pigments such as carbon black, iron black, titanium dioxide, antimony white, chrome yellow, titanium yellow, iron oxide red, cadmium red, ultramarine, and cobalt blue can be used; organic pigments or dyes such as quinacridone red, isoindolinone yellow, and phthalocyanine blue can be used; metallic pigments made from flake-like foils such as aluminum and brass can be used; and pearlescent pigments made from flake-like foils such as titanium dioxide coated with mica and basic lead carbonate can be used. As a resin component, there are no particular limitations; for example, any resin selected from polyurethane resins, acrylic resins, ester resins, amide resins, butyral resins, styrene resins, nitrocellulose (nitrocellulose) resins, cellulose acetate resins, acrylic-polyurethane resins, vinyl chloride-vinyl acetate copolymer resins, vinyl chloride-vinyl acetate-acrylic copolymer resins, and chlorinated polypropylene resins can be used, either alone or in combination of two or more. As a liquid component, organic solvents such as methyl ethyl ketone, toluene, cyclohexanone, ethyl acetate alcohol, ethanol, and methanol, as well as water, can be used.

[0081] The pattern layer constituting the design can be formed by printing ink containing colorant, resin, and liquid components onto the pattern auxiliary layer using gravure printing with a gravure roller. Alternatively, the pattern layer can be formed by dividing the printing of inks with the same or different compositions into different areas and / or repeating the printing process multiple times within the same area.

[0082] The thickness of the pattern layer is preferably 0.1 μm to 5 μm. This allows for good film quality and adhesion. The thickness of the pattern layer is more preferably 0.5 μm to 3 μm.

[0083] (Backside adhesive auxiliary layer)

[0084] The decorative sheet preferably has a back adhesive aid layer laminated to the second side of the substrate sheet, covering the entire second side of the substrate sheet. Because of this back adhesive aid layer, fisheye defects on the second side of the substrate sheet can be repaired, suppressing poor adhesion to the adhered material. It should be noted that the back adhesive aid layer only needs to uniformly cover the entire second side, not necessarily the entire surface. For example, minor defects such as unavoidable pinholes may sometimes occur during the formation of the back adhesive aid layer.

[0085] The second, integral back adhesive auxiliary layer covering the substrate sheet can be formed by gravure printing using a gravure roller. The ink used to form the back adhesive auxiliary layer contains resin and liquid components. The ink may also be appropriately mixed with colorants such as pigments or dyes, extender pigments, stabilizers, plasticizers, catalysts, curing agents, etc.

[0086] As a resin component, there are no particular limitations. For example, polyurethane resins, acrylic resins, ester resins, amide resins, butyral resins, styrene resins, polyurethane-acrylic acid copolymers, polycarbonate-acrylic acid-polyurethane copolymers (polyurethane-acrylic acid copolymers derived from polymers with carbonate bonds in the polymer backbone and two or more hydroxyl groups at the ends and side chains (polycarbonate polyols)), vinyl chloride-vinyl acetate copolymer resins, vinyl chloride-vinyl acetate-acrylic acid copolymer resins, chlorinated propylene resins, nitrocellulose resins (nitrocellulose), cellulose acetate resins, and other resin components can be used. As a liquid component, organic solvents such as methyl ethyl ketone, toluene, cyclohexanone, ethyl acetate alcohol, ethanol, methanol, and water can be used.

[0087] From the viewpoint of improving adhesion to the adhered material, the back adhesive auxiliary layer preferably contains a polyurethane-based resin, and more preferably an ester-based polyurethane.

[0088] Ester-based polyurethane resins are cured products of compositions with polyols (polyhydroxy alcohols) as the main component and isocyanates as crosslinking agents (curing agents).

[0089] As a polyol, compounds with more than two hydroxyl groups in the molecule can be used, such as polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, polyether polyol, etc.

[0090] As isocyanates, polyisocyanates having two or more isocyanate groups in their molecules can be used. For example, aromatic isocyanates such as 2,4-toluene diisocyanate, xylene diisocyanate, and 4,4-diphenylmethane diisocyanate, or aliphatic (or alicyclic) isocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated toluene diisocyanate, and hydrogenated diphenylmethane diisocyanate can be used.

[0091] From the viewpoint of appropriately improving the adhesion to the adhered material, the content of the resin component is based on the mass of the back adhesive auxiliary layer, more preferably 40% by mass or more, and even more preferably 50% by mass or more.

[0092] From the viewpoint of improving dryness, the back adhesive auxiliary layer preferably contains nitrocellulose (nitrocellulose resin) (more than 0% by mass), but from the viewpoint of suppressing discoloration of decorative sheets using biomass-derived polyethylene, the content of nitrocellulose is preferably less than 5% by mass.

[0093] The content of nitrocellulose is based on the mass of the back adhesive auxiliary layer, more preferably 3% by mass or less, and even more preferably 1% by mass or less.

[0094] The back adhesive auxiliary layer is preferably smoothed using a smoothing roller after full-coat printing with a gravure roller. Alternatively, the back adhesive auxiliary layer is preferably smoothed by setting the transport speed of the substrate sheet to a different speed than the outer peripheral rotation speed of the gravure roller. By performing a smoothing treatment, a more uniform back adhesive auxiliary layer can be formed.

[0095] The thickness of the back adhesive auxiliary layer is preferably between 1 μm and 10 μm. Since it can appropriately repair defects caused by fisheyes in the substrate sheet, it can effectively suppress poor adhesion to the adhered material.

[0096] The thickness of the back adhesive auxiliary layer is preferably 1.5μm or more and 5μm or less.

[0097] (Transparent resin layer)

[0098] The decorative sheet preferably has a transparent resin layer laminated on the side opposite to the pattern auxiliary layer of the pattern layer.

[0099] Because of its transparent resin layer, it can protect the pattern layer and improve the durability of the decorative sheet by increasing its scratch resistance.

[0100] It should be noted that the so-called "transparency" refers to any area where the pattern layer can be identified, and it can be semi-transparent or colored.

[0101] In addition to ester-based and olefin-based resins, transparent resin layers can also use acrylic resins, carbonate resins, polyurethane resins, styrene resins, vinyl chloride resins, vinyl acetate resins, and vinyl chloride-vinyl acetate copolymer resins. From the viewpoint of improving molding processability and scratch resistance, ester-based and olefin-based resins are preferred, and olefin-based resins such as polypropylene and polyester are more preferred.

[0102] From the viewpoint of providing better durability, the transparent resin layer preferably contains ultraviolet absorbers and light stabilizers.

[0103] Examples of UV absorbers include benzotriazole UV absorbers, benzophenone UV absorbers, salicylates UV absorbers, and triazine UV absorbers.

[0104] From the perspective of appropriately imparting weather resistance, designability, and inhibiting material seepage, triazine-based ultraviolet absorbers are preferred. The content of the ultraviolet absorber, based on the mass of the transparent resin layer, is preferably 0.1% by mass or more and 1% by mass or less.

[0105] As a light stabilizer, hindered amine-based light stabilizers can be used appropriately.

[0106] The content of light stabilizer is based on the mass of the transparent resin layer, and is preferably 1.5% by mass or more and 3% by mass or less.

[0107] The transparent resin layer may also contain various additives as needed. These include lubricants such as silicone resin, wax, and fluororesin, as well as colorants such as dyes and pigments.

[0108] The thickness of the transparent resin layer is between 40μm and 100μm.

[0109] By making the thickness of the transparent resin layer within the above range, the amount of polyethylene from fossil fuel sources can be appropriately reduced as a whole decorative sheet, thus appropriately reducing the environmental impact.

[0110] The thickness of the transparent resin layer is preferably 50μm or more and 80μm or less.

[0111] As for the method of laminating transparent resin layers, there are no particular limitations as long as it is a common method. Examples include dry lamination and extrusion lamination, which uses a T-die to extrude molten resin and then laminates it.

[0112] It should be noted that T-die or similar devices capable of extruding molten resin can be used as the aforementioned extrusion mechanism.

[0113] Transparent resin layers can also undergo surface treatments such as saponification, glow discharge, corona discharge, plasma discharge, ultraviolet (UV) treatment, and flame treatment.

[0114] (Surface protective layer)

[0115] In decorative films, a surface protective layer may be present on the side of the transparent resin layer opposite to the pattern layer.

[0116] Because of its protective surface layer, it can impart durability (scratch resistance, stain resistance, weather resistance, etc.).

[0117] The surface protective layer may, for example, contain a cured product with thermosetting or ionizing radiation curing components as its main component. The cured product is preferably transparent. The surface protective layer preferably contains ultraviolet absorbers and light stabilizers. The ultraviolet absorbers and light stabilizers can be the same products used for the transparent resin layer.

[0118] Cured products that are thermosetting components include, for example, ester-based polyurethanes or acrylic-based polyurethanes.

[0119] Cured products that are curable components of ionizing radiation include, for example, cured oligomers and / or monomers with free radical polymerizable unsaturated bonds or cationic polymerizable functional groups in their molecules. Ionizing radiation refers to electromagnetic waves or charged particles with energy capable of polymerizing or crosslinking molecules, typically electron beams (EB) or ultraviolet radiation (UV). There are no particular limitations on the method for forming the surface protective layer; known methods can be used.

[0120] Oligomers containing free radical polymerizable unsaturated groups are preferred, for example, oligomers such as polyurethane (meth)acrylate, polyester (meth)acrylate, epoxy (meth)acrylate, melamine (meth)acrylate, and triazine (meth)acrylate, with polyurethane (meth)acrylate oligomers being more preferred. Compounds with a molecular weight typically between 250 and 100,000 can be used.

[0121] As a monomer having unsaturated groups with free radical polymerizability in the molecule, a polyfunctional monomer is preferred, and a polyfunctional (meth)acrylate is more preferred.

[0122] Examples of multifunctional (meth)acrylates include diethylene glycol dimethacrylate, propylene glycol dimethacrylate, bisphenol A ethylene oxide modified dimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane ethylene oxide trimethacrylate, dipentaerythritol tetramethacrylate, dipentaerythritol pentamethacrylate {5-functional (meth)acrylate}, and dipentaerythritol hexamethacrylate {6-functional (meth)acrylate}. It should be noted that monofunctional monomers may also be used appropriately.

[0123] The curable component for ionizing radiation preferably includes polyurethane acrylate oligomers and polyfunctional monomers in a mass ratio of polyurethane acrylate oligomers to polyfunctional monomers ranging from 6 / 4 to 9 / 1.

[0124] When using ultraviolet light to crosslink ionizing radiation-curable resins, a photopolymerization initiator is preferred. The amount of photopolymerization initiator added is, for example, 0.1 to 10 parts by mass relative to 100 parts by mass of the ionizing radiation-curable component.

[0125] The surface protective layer preferably has a glossy or matte finish. Even if the pattern formed by the pattern layer fades due to fisheye, it can still be made inconspicuous.

[0126] The so-called glossy and matte effect refers to a design effect that makes the glossy parts appear to be raised and the matte parts appear to be recessed.

[0127] There are no particular limitations on the method for imparting a glossy / matte effect; the surface protective layer can contain a gloss modifier, or it can be achieved through the uneven shape described later. The uneven shape can be set, for example, to a maximum height Rz of 10 μm to 60 μm. The pattern formed by the glossy / matte effect of the surface protective layer can be in the same tone as all or part of the pattern formed by the pattern layer, or it can be out of tone. Since it can be made less conspicuous even if the pattern formed by the pattern layer fades due to fisheye, an out-of-tone pattern is preferred.

[0128] There is no particular limitation on the thickness of the surface protective layer, for example, it can be between 1 μm and 50 μm. When the thickness of the surface protective layer is less than 1 μm, it may not adequately impart durability (scratch resistance, stain resistance, weather resistance, etc.), while when it exceeds 50 μm, light transmittance may decrease and the recognizability of the pattern layer may be reduced. The thickness of the surface protective layer can be between 3 μm and 40 μm, or between 5 μm and 35 μm.

[0129] (Adhesive layer)

[0130] The decorative sheet may have an adhesive layer between the patterned layer and the transparent resin layer. The adhesive layer is preferably transparent. Examples of adhesives used for this layer include polyurethane-based adhesives such as ester-based polyurethanes and acrylic-based polyurethanes, acrylic adhesives, epoxy adhesives, and rubber adhesives. The thickness of the adhesive layer is, for example, 0.1 μm to 30 μm.

[0131] (Surface bonding auxiliary layer)

[0132] The decorative sheet may also have a surface bonding auxiliary layer between the transparent resin layer and the surface protective layer. The surface bonding auxiliary layer functions as a base coat or easy-to-bond layer relative to the surface protective layer. The surface bonding auxiliary layer is preferably transparent. The adhesive used as the surface bonding auxiliary layer can be, for example, polyurethane-based adhesives such as ester-based polyurethanes and acrylic-based polyurethanes, acrylic adhesives, epoxy adhesives, or rubber-based adhesives. The surface bonding auxiliary layer preferably contains a UV absorber and a light stabilizer. The UV absorber and light stabilizer can be the same type of material as the transparent resin layer. The thickness of the surface bonding auxiliary layer is, for example, 0.1 μm to 30 μm.

[0133] (Manufacturing method of decorative pieces)

[0134] In the manufacturing method of the decorative sheet of the present invention, the order of each process is not particularly limited. For example, it can be performed in the order of pattern auxiliary layer, back adhesive auxiliary layer, and pattern pattern layer; or in the order of pattern auxiliary layer, pattern pattern layer, and back adhesive auxiliary layer; or in the order of back adhesive auxiliary layer, pattern auxiliary layer, and pattern pattern layer. In addition, the processes do not need to be performed consecutively, and other processes or treatments can be performed between these processes.

[0135] Decorative Panels

[0136] The decorative panel of the present invention has an adhesive material laminated on the second side of the substrate sheet of a decorative sheet made of biomass-derived polyethylene.

[0137] Examples of materials that can be adhered to include wood panels, gypsum boards, cement boards, ceramic boards, metal boards, resin boards, and fiber-reinforced plastic boards. As a method of laminating the materials, for example, the materials can be laminated using an adhesive on the second side of the substrate sheet.

[0138] The following information is described in this manual.

[0139] The present invention (1) is a decorative sheet using biomass-derived polyethylene, comprising: a substrate sheet containing biomass-derived polyethylene and having a first side and a second side; a pattern auxiliary layer laminated on the first side of the substrate sheet, covering the entire first side of the substrate sheet; and a pattern pattern layer constituting a pattern pattern, laminated on the opposite side of the pattern auxiliary layer to the substrate sheet, wherein the substrate sheet contains a phenolic antioxidant.

[0140] The present invention (2) is a decorative sheet using biomass-derived polyethylene as described in the present invention (1), wherein the phenolic antioxidant comprises a hindered phenolic antioxidant.

[0141] The present invention (3) is a decorative sheet using biomass-derived polyethylene as described in the present invention (2), wherein the substrate sheet further contains a phosphorus-based antioxidant.

[0142] The present invention (4) is a decorative sheet using biomass-derived polyethylene as described in the present invention (3), wherein, in the substrate sheet, the mass ratio of the phenolic antioxidant to the phosphorus antioxidant is 1:1 to 1:2.

[0143] The present invention (5) is a decorative sheet using polyethylene derived from biomass as described in any one of the present invention (1) to (4), wherein the thickness of the above-mentioned pattern auxiliary layer is more than 1 μm and less than 5 μm.

[0144] The present invention (6) is a decorative sheet using polyethylene derived from biomass as described in any one of the present invention (1) to (5), wherein the above-mentioned pattern auxiliary layer is subjected to a smoothing treatment.

[0145] The present invention (7) is a decorative sheet using biomass-derived polyethylene as described in any one of the present invention (1) to (6), wherein it has a back adhesive auxiliary layer that is laminated on the second side of the substrate sheet and covers the entire second side of the substrate sheet.

[0146] The present invention (8) is a decorative sheet using polyethylene of biomass source as described in any one of the present invention (1) to (7), wherein the content of nitrocellulose in the back adhesive auxiliary layer is 5% by mass or less.

[0147] The present invention (9) is a decorative sheet using polyethylene derived from biomass as described in any one of the present inventions (1) to (8), wherein a transparent resin layer is laminated on the side opposite to the pattern auxiliary layer of the patterned layer, and the thickness of the transparent resin layer is 40 μm or more and 100 μm or less.

[0148] The present invention (10) is a decorative sheet using biomass-derived polyethylene as described in the present invention (9), wherein the transparent resin layer comprises an olefin resin.

[0149] The present invention (11) is a decorative panel in which the second side of the substrate sheet of the decorative sheet using biomass-derived polyethylene in any one of the present invention (1) to (10) has an adhesive material laminated.

[0150] Example

[0151] The invention will now be described in more detail through examples. However, the invention is not limited to these examples.

[0152] (Example 1)

[0153] Prepare a biomass-derived polyethylene [80 μm thick colored polyethylene film containing 0.05% by mass of phenolic antioxidant (Irganox 1010, manufactured by BASF Japan Co., Ltd.)] with a biomass ratio of 15%, and fabricate it into a substrate sheet.

[0154] On one side of the substrate sheet, ink containing organic solvents is applied in a gravure printing method using a gravure roller to cover the entire surface, thereby forming a back adhesive auxiliary layer (containing 53% by mass of ester-based polyurethane resin and 5% by mass of nitrocellulose).

[0155] On the other side of the substrate sheet, ink containing organic solvents is applied to the entire surface using gravure printing with a gravure roller, thereby forming a 2μm thick pattern auxiliary layer with acrylic-polyurethane resin as the main component. Then, ink containing colorant and organic solvents is partially printed using gravure printing with a gravure roller, thereby forming a 2μm thick pattern layer (wood grain pattern) with acrylic-polyurethane resin as the main component.

[0156] An ester-based polyurethane is coated on the side opposite to the pattern auxiliary layer of the pattern layer to form an adhesive layer with a thickness of 10 μm. On the adhesive layer, a transparent olefin sheet with a thickness of 60 μm is dry-laminated to form a transparent resin layer.

[0157] Furthermore, a 2μm thick surface adhesive auxiliary layer containing acrylic-polyurethane copolymer resin is formed on the side opposite to the adhesive layer of the transparent resin layer. After applying a coating agent (polyurethane acrylic ionizing radiation curable resin composition) to the surface adhesive auxiliary layer using gravure coating, the coating agent is cured by irradiation with ionizing radiation to form a 5μm thick surface protective layer.

[0158] Finally, an embossing process using hot pressing is performed on the side with the protective layer to form a concave-convex shape, thus creating a decorative piece.

[0159] (Example 2)

[0160] Prepare a biomass-derived polyethylene film with a biomass ratio of 15% [80 μm thick colored polyethylene film containing 0.05% by mass of phenolic antioxidant (Irganox 1010, manufactured by BASF Japan Co., Ltd.) and 0.05% by mass of phosphorus antioxidant (Irgafos 168, manufactured by BASF Japan Co., Ltd.)], and fabricate it into a substrate sheet.

[0161] On one side of the substrate sheet, ink containing organic solvents is applied in a gravure printing method using a gravure roller to cover the entire surface, thereby forming a back adhesive auxiliary layer (containing 53% by mass of ester-based polyurethane resin and 0% by mass of nitrocellulose).

[0162] On the other side of the substrate sheet, ink containing organic solvents is applied to the entire surface using gravure printing with a gravure roller, thereby forming a 2μm thick pattern auxiliary layer with acrylic-polyurethane resin as the main component. Then, ink containing colorant and organic solvents is partially printed using gravure printing with a gravure roller, thereby forming a 2μm thick pattern layer (wood grain pattern) with acrylic-polyurethane resin as the main component.

[0163] An ester-based polyurethane is coated on the side opposite to the pattern auxiliary layer of the pattern layer to form an adhesive layer with a thickness of 10 μm. On the adhesive layer, a transparent olefin sheet with a thickness of 60 μm is dry-laminated to form a transparent resin layer.

[0164] Furthermore, a 2μm thick surface adhesive auxiliary layer containing acrylic-polyurethane copolymer resin is formed on the side opposite to the adhesive layer of the transparent resin layer. After applying a coating agent (polyurethane acrylic ionizing radiation curable resin composition) to the surface adhesive auxiliary layer using gravure coating, the coating agent is cured by irradiation with ionizing radiation to form a 5μm thick surface protective layer.

[0165] Finally, an embossing process using hot pressing is performed on the side with the protective layer to form a concave-convex shape, thus creating a decorative piece.

[0166] (Example 3)

[0167] Prepare a biomass-derived polyethylene [80 μm thick colored polyethylene film containing 0.05% by mass of phenolic antioxidant (Irganox 1010, manufactured by BASF Japan Co., Ltd.)] with a biomass ratio of 15%, and fabricate it into a substrate sheet.

[0168] On one side of the substrate sheet, ink containing organic solvents is applied in a gravure printing method using a gravure roller to cover the entire surface, thereby forming a back adhesive auxiliary layer (containing 53% by mass of ester-based polyurethane resin and 10% by mass of nitrocellulose).

[0169] On the other side of the substrate sheet, ink containing organic solvents is applied to the entire surface using gravure printing with a gravure roller, thereby forming a 2μm thick pattern auxiliary layer with acrylic-polyurethane resin as the main component. Then, ink containing organic solvents is applied to the entire surface using gravure printing with a gravure roller, thereby forming a 2μm thick pattern layer (wood grain pattern) with acrylic-polyurethane resin as the main component.

[0170] An ester-based polyurethane is coated on the side opposite to the pattern auxiliary layer of the pattern layer to form an adhesive layer with a thickness of 10 μm. On the adhesive layer, a transparent olefin sheet with a thickness of 60 μm is dry-laminated to form a transparent resin layer.

[0171] Furthermore, a 2μm thick surface adhesive auxiliary layer containing acrylic-polyurethane copolymer resin is formed on the side opposite to the adhesive layer of the transparent resin layer. After applying a coating agent (polyurethane acrylic ionizing radiation curable resin composition) to the surface adhesive auxiliary layer using gravure coating, the coating agent is cured by irradiation with ionizing radiation to form a 5μm thick surface protective layer.

[0172] Finally, an embossing process using hot pressing is performed on the side with the protective layer to form a concave-convex shape, thus creating a decorative piece.

[0173] (Comparative Example 1)

[0174] Prepare a biomass-derived polyethylene film [80 μm thick colored polyethylene film, without antioxidants] with a biomass ratio of 15% and fabricate it into a substrate sheet.

[0175] On one side of the substrate sheet, ink containing organic solvents is applied in a gravure printing method using a gravure roller to cover the entire surface, thereby forming a back adhesive auxiliary layer (containing 53% by mass of ester-based polyurethane resin and 5% by mass of nitrocellulose).

[0176] On the other side of the substrate sheet, ink containing organic solvents is applied to the entire surface using gravure printing with a gravure roller, thereby forming a 2μm thick pattern auxiliary layer with acrylic-polyurethane resin as the main component. Then, ink containing organic solvents is applied to the entire surface using gravure printing with a gravure roller, thereby forming a 2μm thick pattern layer (wood grain pattern) with acrylic-polyurethane resin as the main component.

[0177] An ester-based polyurethane is coated on the side opposite to the pattern auxiliary layer of the pattern layer to form an adhesive layer with a thickness of 10 μm. On the adhesive layer, a transparent olefin sheet with a thickness of 60 μm is dry-laminated to form a transparent resin layer.

[0178] Furthermore, a 2μm thick surface adhesive auxiliary layer containing acrylic-polyurethane copolymer resin is formed on the side opposite to the adhesive layer of the transparent resin layer. After applying a coating agent (polyurethane acrylic ionizing radiation curable resin composition) to the surface adhesive auxiliary layer using gravure coating, the coating agent is cured by irradiation with ionizing radiation to form a 5μm thick surface protective layer.

[0179] Finally, an embossing process using hot pressing is performed on the side with the protective layer to form a concave-convex shape, thus creating a decorative piece.

[0180] (Comparative Example 2)

[0181] Prepare a biomass-derived polyethylene [80 μm thick colored polyethylene film containing 0.05% by mass of phosphorus-based antioxidant (Irgafos 168, manufactured by BASF Japan Co., Ltd.)] with a biomass ratio of 15%, and fabricate it into a substrate sheet.

[0182] On one side of the substrate sheet, ink containing organic solvents is applied in a gravure printing method using a gravure roller to cover the entire surface, thereby forming a back adhesive auxiliary layer (containing 53% by mass of ester-based polyurethane resin and 5% by mass of nitrocellulose).

[0183] On the other side of the substrate sheet, ink containing organic solvents is applied to the entire surface using gravure printing with a gravure roller, thereby forming a 2μm thick pattern auxiliary layer with acrylic-polyurethane resin as the main component. Then, ink containing organic solvents is applied to the entire surface using gravure printing with a gravure roller, thereby forming a 2μm thick pattern layer (wood grain pattern) with acrylic-polyurethane resin as the main component.

[0184] An ester-based polyurethane is coated on the side opposite to the pattern auxiliary layer of the pattern layer to form an adhesive layer with a thickness of 10 μm. On the adhesive layer, a transparent olefin sheet with a thickness of 60 μm is dry-laminated to form a transparent resin layer.

[0185] Furthermore, a 2μm thick surface adhesive auxiliary layer containing acrylic-polyurethane copolymer resin is formed on the side opposite to the adhesive layer of the transparent resin layer. After applying a coating agent (acrylic-polyurethane ionizing radiation curable resin composition) to the surface adhesive auxiliary layer using gravure coating, the coating agent is cured by irradiation with ionizing radiation to form a 5μm thick surface protective layer.

[0186] Finally, an embossing process using hot pressing is performed on the side with the protective layer to form a concave-convex shape, thus creating a decorative piece.

[0187] <Evaluation Methods>

[0188] (1) Fading of patterns

[0189] For the decorative sheets made of biomass-derived polyethylene obtained in the examples and comparative examples, the presence of pattern peeling (color fading) of the pattern layer was visually inspected from a distance of 50 cm under a light source of 500 lux or higher, and the following criteria were used for evaluation. The results are shown in Table 1.

[0190] <Evaluation Criteria>

[0191] +: No color fading of the pattern was confirmed.

[0192] -: Confirmed color fading of the pattern.

[0193] (2) Durability

[0194] For the decorative sheets made of biomass-derived polyethylene obtained in the examples and comparative examples, the following ultra-accelerated weather resistance testing apparatus was used at a black panel temperature of 63°C and an illuminance of 100 mW / cm². 2 After being irradiated with ultraviolet light for 20 hours under certain conditions, the film was allowed to condense for 4 hours, and this cycle was repeated. After 300 hours, the appearance of the decorative film was visually evaluated. The results are shown in Table 1.

[0195] <Super-enhanced Weather Resistance Testing Device>

[0196] EYE SUPER UV TESTER SUV-W161 (manufactured by Iwasaki Electric Co., Ltd.) is an ultra-fast weathering resistance testing device equipped with a UV lamp (trade name: M04-L21WB / SUV, manufactured by Iwasaki Electric Co., Ltd.), a lampshade (trade name: WJ50-SUV, manufactured by Iwasaki Electric Co., Ltd.), and an illuminometer (trade name: UVD-365PD, manufactured by Iwasaki Electric Co., Ltd.).

[0197] <Evaluation Criteria>

[0198] +: No cracks appeared

[0199] -: Cracks have appeared.

[0200] (3) Discoloration (reddish tinge)

[0201] Decorative sheets made from biomass-derived polyethylene, as described in Examples 1-3, were placed in sealed containers and stored at 60°C for two weeks. The color difference on the back of the decorative sheets before and after storage was measured and evaluated according to the following criteria. The results are shown in Table 2. It should be noted that the color difference was measured using a spectrophotometer CR-400 (manufactured by Konica Minolta (Japan) Co., Ltd.).

[0202] <Evaluation Criteria>

[0203] +: The color difference Δa before and after the test is less than 0.2.

[0204] - The color difference Δa before and after the test is greater than 0.2.

[0205] [Table 1]

[0206]

[0207] [Table 2]

[0208]

[0209] As can be confirmed by the examples, by containing phenolic antioxidants in the substrate sheet and laminating a pattern auxiliary layer covering the entire first side of the substrate sheet, it is possible to suppress the fading of the pattern caused by fisheye and to achieve excellent durability.

[0210] Furthermore, a comparison between Example 1 and Example 3 confirms that by keeping the content of nitrocellulose in the back adhesive auxiliary layer below 5% by mass, discoloration of the decorative sheet can be suppressed.

[0211] On the other hand, in Comparative Example 1, since the substrate sheet did not contain antioxidants, the pattern faded due to fisheye, and the durability was reduced due to the deterioration of the substrate sheet.

[0212] In addition, in Comparative Example 2, the durability decreased because the phosphorus-based antioxidant contained in the substrate sheet was deactivated due to hydrolysis.

[0213] Symbol Explanation

[0214] 1: Substrate sheet; 2: Pattern auxiliary layer; 3: Pattern design layer; 4: Back adhesive auxiliary layer; 5: Adhesive layer; 6: Transparent resin layer; 7: Surface adhesive auxiliary layer; 8: Surface protective layer; 10: Decorative sheet made of biomass-derived polyethylene.

Claims

1. A decorative sheet using biomass-derived polyethylene, characterized in that, have: A substrate sheet comprising biomass-derived polyethylene and having a first side and a second side; A patterned auxiliary layer is stacked on the first side of the substrate sheet, covering the entire first side of the substrate sheet; and The pattern layer constituting the pattern design is stacked on the side of the pattern auxiliary layer opposite to the substrate sheet. The substrate sheet contains phenolic antioxidants.

2. The decorative sheet using biomass-derived polyethylene as described in claim 1, characterized in that: The phenolic antioxidants include hindered phenolic antioxidants.

3. The decorative sheet using biomass-derived polyethylene as described in claim 1 or 2, characterized in that: The substrate sheet also contains phosphorus-based antioxidants.

4. The decorative sheet using biomass-derived polyethylene as described in claim 3, characterized in that: In the substrate sheet, the mass ratio of the phenolic antioxidant to the phosphorus antioxidant is 1:1 to 1:

2.

5. The decorative sheet using biomass-derived polyethylene as described in claim 1 or 2, characterized in that: The thickness of the patterned auxiliary layer is between 1 μm and 5 μm.

6. The decorative sheet using biomass-derived polyethylene as described in claim 1 or 2, characterized in that: The patterned auxiliary layer is smoothed.

7. The decorative sheet using biomass-derived polyethylene as described in claim 1 or 2, characterized in that: It has a back adhesive auxiliary layer, which is stacked on the second side of the substrate sheet and covers the entire second side of the substrate sheet.

8. The decorative sheet using biomass-derived polyethylene as described in claim 7, characterized in that: The content of nitrocellulose in the back adhesive auxiliary layer is less than 5% by mass.

9. The decorative sheet using biomass-derived polyethylene as described in claim 1 or 2, characterized in that: A transparent resin layer is laminated on the side opposite to the pattern auxiliary layer of the patterned layer. The thickness of the transparent resin layer is between 40 μm and 100 μm.

10. The decorative sheet using biomass-derived polyethylene as described in claim 9, characterized in that: The transparent resin layer comprises an olefin-based resin.

11. A decorative panel, characterized in that: The second side of the substrate sheet of the decorative sheet using biomass-derived polyethylene as described in claim 1 or 2 has an adhesive material laminated thereon.

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