Decorative sheet, decorative member and method for producing decorative sheet

Abstract

To provide a decorative sheet having a transparent resin layer excellent in bender bending workability (post-workability) while maintaining scratch resistance, film-formation property and transparency required for actual use, a decorative member, and a method for producing a decorative sheet.SOLUTION: A decorative sheet 1 has a transparent resin layer 3 formed of a resin composition containing a plurality of kinds of polypropylene resins, wherein the resin composition contains high crystalline polypropylene, low crystalline polypropylene and random polypropylene as the plurality of kinds of polypropylene resins, as for each blending ratio of the plurality of kinds of polypropylene resins based on the mass of the resin composition, the high crystalline polypropylene is within the range of 30 mass% or more and 60 mass% or less, the low crystalline polypropylene is within the range of 30 mass% or more and 50 mass% or less, and the random polypropylene is within the range of 10 mass% or more and 20 mass% or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a decorative sheet used for architectural interior materials, surface materials for fittings, surface materials for home appliances, etc., a decorative member using the decorative sheet, and a method for manufacturing the decorative sheet. The decorative sheet is used as a decorative member (decorative plate) by being attached to a substrate such as a wood board, an inorganic board, or a metal plate. [Background technology]

[0002] In recent years, many decorative sheets using olefin resins have been proposed as alternatives to decorative sheets made of polyvinyl chloride, as shown in Patent Documents 1 and 2. By not using vinyl chloride resin, these decorative sheets suppress the generation of toxic gases and the like during incineration. However, conventional decorative sheets made from olefin-based resins have poor surface scratch resistance because they use general polypropylene sheets, and are inferior in scratch resistance to conventional decorative sheets made from polyvinyl chloride.

[0003] In response to these problems, a decorative sheet with excellent surface scratch resistance has been proposed, as described in Patent Document 3. However, as the applications of decorative boards using such decorative sheets continue to expand, and consumers' awareness of quality is also becoming increasingly sophisticated, there is a demand for improvements in the quality of decorative sheets other than scratch resistance, in particular improvements in resistance to post-processing such as bending by a bender. Here, the decorative sheets described in Patent Documents 4 to 6 have been proposed as decorative sheets with improved post-processability. These decorative sheets are decorative sheets having a transparent resin layer in which a soft component is added to a random polymerization type polypropylene resin. However, this decorative sheet has a problem that the scratch resistance required for practical use and the film formability of the transparent resin layer are deteriorated because the sheet has become soft due to the improved post-processability. In addition, the transparent resin layer is required to suppress cloudiness and maintain transparency. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2-128843 [Patent Document 2] Japanese Patent Application Publication No. 6-198831 [Patent Document 3] Patent No. 3772634 [Patent Document 4] Patent No. 3185590 [Patent Document 5] Patent No. 3567899 [Patent Document 6] Patent No. 3175482 Summary of the Invention [Problem to be solved by the invention]

[0005] The present disclosure has been made with attention to the above points, and aims to provide a decorative sheet, a decorative member, and a method for manufacturing a decorative sheet having a transparent resin layer that has excellent bender bending processability (post-processability) while maintaining the scratch resistance, film-formability, and transparency required for practical use. [Means for solving the problem]

[0006] In order to solve the above problems, a decorative sheet which is one embodiment of the present disclosure is a decorative sheet having a transparent resin layer formed from a resin composition containing multiple types of polypropylene resins, wherein the resin composition includes high crystalline polypropylene, low crystalline polypropylene and random polypropylene as the multiple types of polypropylene resins, and the blending ratio of each of the multiple types of polypropylene resins based on the mass of the resin composition is within the range of 30% to 60% by mass for the high crystalline polypropylene, 30% to 50% by mass for the low crystalline polypropylene, and 10% to 20% by mass for the random polypropylene. A decorative member according to one aspect of the present disclosure includes a substrate and the decorative sheet provided on at least one surface of the substrate. Furthermore, a manufacturing method for a decorative sheet that is one aspect of the present disclosure is a manufacturing method for the decorative sheet, in which the transparent resin layer is formed using the resin composition containing the multiple types of polypropylene resins, the multiple types of polypropylene resins being the high crystalline polypropylene, the low crystalline polypropylene and random polypropylene, and the blending ratios of each of the multiple types of polypropylene resins based on the mass of the resin composition are such that the high crystalline polypropylene is in the range of 30% to 60% by mass, the low crystalline polypropylene is in the range of 30% to 50% by mass, and the random polypropylene is in the range of 10% to 20% by mass. Effect of the Invention

[0007] According to one aspect of the present disclosure, it is possible to provide a decorative sheet, a decorative member, and a method for manufacturing a decorative sheet, which have a transparent resin layer that has excellent bender bending processability (post-processability) while maintaining the scratch resistance, film-formability, and transparency required for practical use. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram showing the configuration of a decorative sheet and a decorative board according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present inventors conducted intensive research and discovered that in a transparent resin layer formed from a resin composition containing multiple types of polypropylene resins, by ensuring that the blending ratios of each of the multiple types of polypropylene resins satisfy specific conditions, it is possible to improve post-processability (bender bending processability) while suppressing a decrease in the surface strength (scratch resistance) and film-formability of the decorative sheet, and the transparency of the transparent resin layer. This has led to the invention of a decorative sheet having a transparent resin layer that has excellent bender bending processability (post-processability) while maintaining the scratch resistance, film-forming properties, and transparency required for practical use.

[0010] Hereinafter, a decorative sheet and a decorative member according to an embodiment of the present disclosure will be described with reference to the drawings. Here, the drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc. differ from the actual ones. In addition, the embodiments shown below are examples of configurations for embodying the technical idea of ​​the present disclosure, and the technical idea of ​​the present disclosure is not limited to the materials, shapes, structures, etc. of the components described below. The technical idea of ​​the present disclosure can be modified in various ways within the technical scope defined by the claims described in the claims. In addition, the directions of "left and right" and "up and down" in the following description are merely defined for the convenience of explanation and do not limit the technical ideas of the present disclosure. Therefore, for example, if the page is rotated 90 degrees, "left and right" and "up and down" are read interchangeably, and if the page is rotated 180 degrees, "left" becomes "right" and "right" becomes "left".

[0011] <Configuration of decorative sheet and decorative member> FIG. 1 shows a cross-sectional structure of one embodiment of the decorative sheet and decorative member according to this embodiment. In the decorative sheet 1 of this embodiment, a plurality of resin layers are laminated on the surface side of a base layer 6, and a transparent resin layer 3 is disposed as the surface-side resin layer among the plurality of resin layers. Specifically, in the decorative sheet 1 of this embodiment, as shown in Fig. 1, a picture pattern layer 5, a transparent resin layer 3, and a surface protection layer 2 are laminated in this order on one surface (surface) of the base layer 6 constituting the original fabric layer. Reference numeral 4 denotes an adhesive layer. In addition, a concealing layer 7 and a primer layer 8 are formed in this order on the other surface (rear surface) of the base material layer 6. The concealing layer 7 may be formed between the base material layer 6 and the picture pattern layer 5, or may be omitted. The decorative sheet 1 according to this embodiment may include any layer among the layers shown in FIG. 1 as necessary depending on the application, and may include at least the transparent resin layer 3.

[0012] Furthermore, taking into consideration printing workability and costs, the layer thicknesses of the decorative sheet 1 having the above configuration are, for example, within the ranges of 3 to 20 μm for the surface protection layer 2, 20 to 200 μm for the transparent resin layer 3, 1 to 20 μm for the adhesive layer 4, 0.1 to 20 μm for the picture pattern layer 5, 20 to 150 μm for the base layer 6, 2 to 20 μm for the concealing layer 7, and 0.1 to 20 μm for the primer layer 8, with the total thickness of the decorative sheet 1 being within the range of 49 to 450 μm. FIG. 1 illustrates an example in which the decorative sheet 1 of this embodiment is attached to a base material B to form a decorative member 10.

[0013] <Base material layer 6> The base layer 6 is composed of paper, a resin sheet, foil, etc. Examples of paper include tissue paper, titanium paper, resin-impregnated paper, organic or inorganic nonwoven fabric, synthetic paper, etc. Examples of resin for the resin sheet include synthetic resins such as polyethylene, polypropylene, polybutylene, polystyrene, polycarbonate, polyester, polyamide, ethylene-vinyl acetate copolymer, polyvinyl alcohol, acrylic, etc., or foams of these synthetic resins, ethylene-propylene copolymer rubber, ethylene-propylene-diene copolymer rubber, styrene-butadiene copolymer rubber, styrene-isoprene-styrene block copolymer rubber, styrene-butadiene-styrene block copolymer rubber, polyurethane, etc. Examples of foil include metal foils such as aluminum, iron, gold, silver, etc.

[0014] <Pattern layer 5> The picture pattern layer 5 can be provided using a known printing method. When the base material layer 6 can be prepared in a rolled state, printing for forming the picture pattern layer 5 can be performed using a roll-to-roll printing device. The printing method is not particularly limited, but for example, gravure printing can be used in consideration of productivity and quality of the pattern. The design pattern can be any pattern that takes into consideration the design of the area where the material is used, such as flooring or wall material. For wood-based designs, various wood grains are often used, and cork can also be used as a pattern other than wood grain. For example, if the design is based on a stone floor such as marble, marble grain can be used as the pattern. In addition to patterns made from natural materials, artificial patterns based on natural materials or geometric patterns can also be used.

[0015] The printing ink is not particularly limited, but an ink suitable for the printing method can be appropriately selected. It is preferable to select the ink taking into consideration the adhesion to the resin base layer 6, printability, weather resistance as a decorative material, etc. The printing ink is appropriately added with pigments, colorants such as dyes, extender pigments, solvents, and binders that are contained in normal inks. Examples of pigments include condensed azo, insoluble azo, quinacridone, isoindoline, anthraquinone, imidazolone, cobalt, phthalocyanine, carbon, titanium oxide, iron oxide, and pearl pigments such as mica. The binder may be water-based, solvent-based, or emulsion type, and the curing method may be a one-liquid type, a two-liquid type consisting of a base agent and a curing agent, or a type cured by ultraviolet light or electron beams, and is not particularly limited. The most common method is a two-liquid type that uses a urethane-based base agent and a curing agent consisting of an isocyanate. In addition, designs may be applied by vapor deposition or sputtering of various metals.

[0016] <Adhesive layer 4> The adhesive layer 4 is provided for the purpose of strengthening the adhesion between the base layer 6 and the picture pattern layer 5 and the transparent resin layer 3. This strong adhesion can impart bending workability to the decorative sheet 1 so as to conform to curved surfaces and right-angled surfaces. The adhesive layer 4 is preferably transparent. The adhesive layer 4 can be made of any material as an adhesion method, and can be made by laminating methods such as thermal lamination, extrusion lamination, and dry lamination, and the adhesive can be appropriately selected from acrylic, polyester, polyurethane, and epoxy adhesives. In general, it is desirable to use a two-liquid curing type material, particularly a urethane material obtained by reacting a polyol with an isocyanate, in view of its cohesive strength. The adhesive layer 4 may be omitted if sufficient adhesive strength is obtained between the transparent resin layer 3 and the picture pattern layer 5.

[0017] <Transparent resin layer 3> The transparent resin layer 3 is produced as, for example, a transparent resin sheet and then laminated. The transparent resin layer 3 is formed using a resin composition containing multiple types of polypropylene resins (hereinafter also referred to as "PP resins"). Specifically, the resin composition forming the transparent resin layer 3 contains, as the multiple types of polypropylene resins, a high crystalline polypropylene resin, a low crystalline polypropylene resin, and a random polypropylene resin. In order to improve the post-processability (bender bending processability) of a transparent resin layer containing a high-crystalline PP resin and a low-crystalline PP resin, it is necessary to increase the ratio of the low-crystalline PP resin to the high-crystalline PP resin. However, as the ratio of the low-crystalline PP resin increases, the softness increases, which may result in a decrease in scratch resistance and film formability. In the decorative sheet 1 according to this embodiment, by using a random PP resin in addition to the high crystallinity PP resin and low crystallinity PP resin as described above, it is possible to improve the bending processability in a bender while suppressing the deterioration of scratch resistance and film formability. Each polypropylene resin will be described in detail below.

[0018] [Highly crystalline polypropylene resin] The highly crystalline polypropylene resin contained in the transparent resin layer 3 can be designed by appropriately selecting from, for example, isotactic polypropylene and syndiotactic polypropylene having different pentad fractions, random polypropylene, block polypropylene, and mixtures thereof. In this embodiment, the highly crystalline polypropylene resin is preferably a highly crystalline homopolypropylene resin that is a propylene homopolymer, i.e., a homopolymer, having a pentad fraction (mmmm fraction) of 95% or more, more preferably 96% or more. In addition, in consideration of film formability and scratch resistance, the MFR of the highly crystalline polypropylene resin at 230°C can be designed within a range of 0.5g / 10min to 30g / 10min (more preferably within a range of 10g / 10min to 25g / 10min).

[0019] The above pentad fraction (mmmm fraction) is the fraction of carbon (C) with a mass number of 13 (nuclide). 13 It is calculated from a numerical value (electromagnetic wave absorptance) obtained by resonating the resin composition constituting the transparent resin layer 3 at a predetermined resonance frequency using C-NMR measurement (nuclear magnetic resonance measurement). This pentad fraction (mmmm fraction) defines the atomic arrangement, electronic structure, and molecular microstructure in the resin composition. The pentad fraction of polypropylene resin is 13 The pentad fraction is the ratio of five propylene units arranged in a row determined by C-NMR and is used as a measure of crystallinity or stereoregularity. Such a pentad fraction is one of the important factors that mainly determine the scratch resistance of the surface, and basically, the higher the pentad fraction, the higher the crystallinity of the sheet, and therefore the better the scratch resistance. Furthermore, by using a highly crystalline polypropylene resin as the main component of the transparent resin layer 3, the surface strength (scratch resistance) of the decorative sheet is increased.

[0020] [Low crystalline polypropylene resin] The low crystalline polypropylene resin added to the transparent resin layer 3 is preferably a polypropylene resin that satisfies at least one of the following characteristics. Mesopentad fraction is between 20% and 60% (More preferably, 40% to 55%.) MFR at 230℃ is 30g / 10min or more and 100g / 10min or less (More preferably, 30g / 10min to 60g / 10min) Mass average molecular weight (Mw) is between 10,000 and 500,000 (More preferably, between 50,000 and 200,000) Molecular weight distribution (Mw / Mn) less than 4 A melting point, defined as the peak top observed on the highest temperature side of the melting endothermic curve obtained by holding at -10°C for 5 minutes under a nitrogen atmosphere using a differential scanning calorimeter (DSC), and then heating at 10°C / min, is between 0°C and 120°C. (More preferably, 40°C or higher and 100°C or lower)

[0021] Low crystalline polypropylene resins tend to have properties such as low crystallinity, softness, low melting point, and high solubility in solvents. By adopting such low crystalline polypropylene resins, when added to high crystalline polypropylene resins, they have the properties of high compatibility and slowing down the crystallization rate, while having no effect on the crystallinity of the high crystalline polypropylene resin or the effect on the crystallinity is significantly reduced.

[0022] [Random polypropylene resin] The random polypropylene resin added to the transparent resin layer 3 preferably has an MFR at 230° C. in the range of 10 g / 10 min to 50 g / 10 min (more preferably, an MFR at 230° C. in the range of 10 g / 10 min to 30 g / 10 min). In this way, by setting the MFR of the random polypropylene resin between the MFR of the high crystalline polypropylene resin and the MFR of the low crystalline polypropylene resin, the compatibility of the three types of PP resins in a molten state can be increased, and the film formability of the transparent resin layer 3 can be improved. In this embodiment, the random PP resin used for the transparent resin layer 3 preferably has a tensile modulus, as defined by JIS K 7161, of 300 MPa to 1000 MPa (more preferably 500 MPa to 800 MPa).

[0023] Next, the blending ratio MR1 of the high crystalline PP resin, the blending ratio MR2 of the low crystalline PP resin, and the blending ratio MR3 of the random PP resin based on the mass of the resin composition forming the transparent resin layer 3 will be described.

[0024] In this embodiment, the blending ratio MR3 of the random PP resin in the transparent resin layer 3 is smaller than both the blending ratio MR1 of the PP resin and the blending ratio MR2 of the low-crystalline PP resin (MR1>MR3 and MR2>MR3). In other words, the blending ratio of the random PP resin in the resin composition forming the transparent resin layer 3 is the smallest among the multiple types of PP resins (three types in this example). Therefore, as the PP resin contained in the resin composition forming the transparent resin layer 3, the amount of random PP resin added is the smallest, and the amount of each of the high crystalline PP resin and the low crystalline PP resin added is greater than the random PP resin.

[0025] More specifically, the blending ratios of the three types of polypropylene resins in the transparent resin layer 3 are preferably such that the blending ratio MR1 of the high crystalline PP resin is in the range of 30% to 60% by mass, the blending ratio MR2 of the low crystalline PP resin is in the range of 30% to 50% by mass, and the blending ratio MR3 of the random PP resin is in the range of 10% to 20% by mass, based on the mass of the resin composition forming the transparent resin layer 3. More preferably, the blending ratio MR1 of the high crystalline PP resin is in the range of 40% to 50% by mass, the blending ratio MR2 of the low crystalline PP resin is in the range of 35% to 45% by mass, and the blending ratio MR3 of the random PP resin is in the range of 10% to 20% by mass. By setting the blending ratio of each of the three types of PP resins in the transparent resin layer 3 as described above, it is possible to impart excellent bender bending processability (post-processability) to the transparent resin layer 3 while maintaining the scratch resistance, film-formability, and transparency required for practical use. Therefore, it is possible to provide a decorative sheet 1 having a transparent resin layer 3 that is excellent in bender bending processability (post-processability) while maintaining the scratch resistance, film-forming property, and transparency required for practical use.

[0026] On the other hand, if the blending ratio MR1 of the high crystalline PP resin is less than 30% by mass, the softness of the low crystalline PP resin and random PP resin will have a large effect, and the scratch resistance (surface hardness of the decorative sheet 1) may decrease. Furthermore, if the blending ratio MR1 of the high crystalline PP resin exceeds 60% by mass, the low crystalline PP resin and random PP resin will not provide the appropriate level of softness required for good post-processing, and the post-processing ability of the decorative sheet 1 (bender bending ability in this example) may decrease. Furthermore, if the blending ratio MR2 of the low crystalline PP resin is less than 30 mass%, the appropriate flexibility that provides good post-processing properties may not be imparted, and the post-processing properties (bender bending processability) of the decorative sheet 1 may be reduced. Furthermore, if the blending ratio MR2 of the low crystalline PP resin exceeds 50 mass%, the softness may increase excessively, causing necking-in or film breakage during film formation, and reducing the film-formability of the transparent resin layer 3. Here, film-formability refers to whether the transparent resin layer 3 can be formed into a film without any problems during melt extrusion. Furthermore, if the blending ratio MR3 of the random PP resin is less than 10% by mass, necking-in or film breakage may occur during film formation, reducing the film formability of the transparent resin layer 3. If the blending ratio MR3 of the random PP resin exceeds 20% by mass, the compatibility between the high crystalline PP resin and the low crystalline PP resin may be inhibited, causing the transparent resin layer to become cloudy, reducing the transparency of the transparent resin layer 3.

[0027] Thus, by setting the blending ratios MR1, MR2, and MR3 of the three types of polypropylene resins as described above, it is possible to provide a decorative sheet 1 having a transparent resin layer 3 with excellent bending processability (post-processing property) while reliably maintaining high scratch resistance, film-forming property, and transparency.

[0028] In this embodiment, the magnitude relationship between the blending ratio MR1 of the highly crystalline PP resin and the blending ratio MR2 of the low-crystalline PP resin is not particularly limited. That is, in the transparent resin layer 3, the blending ratio MR1 of the highly crystalline PP resin may be greater than the blending ratio MR2 of the low-crystalline PP resin (MR1>MR2). Also, the blending ratio MR2 of the low-crystalline PP resin may be greater than the blending ratio MR1 of the highly crystalline PP resin (MR1<MR2). Further, the blending ratio MR1 of the highly crystalline PP resin and the blending ratio MR2 of the low-crystalline PP resin may be equal (MR1=MR2). When the blending ratio MR2 of the low-crystalline PP resin is greater than the blending ratio MR1 of the highly crystalline PP resin (MR1<MR2), it is preferable that the difference between the blending ratio MR2 of the low-crystalline PP resin and the blending ratio MR1 of the highly crystalline PP resin is less than 20% by mass (MR2-MR1<20% by mass). Thereby, even when the blending ratio of the low-crystalline PP resin is the highest in the transparent resin layer, the softness can be suitably controlled, and the scratch resistance and film-forming property can be improved together with the bending processability.

[0029] Moreover, in the decorative sheet 1 according to this embodiment, the transparent resin layer 3 is not limited to the above configuration. In the transparent resin layer 3 of this embodiment, the tensile elastic modulus of the low-crystalline PP resin contained in the above resin composition may be 25 MPa or more and 500 MPa or less, more preferably 50 MPa or more and 120 MPa or less. Also, in this case, the low-crystalline PP resin may be added in an amount of 0.1 to 20 parts by mass with respect to 100 parts by mass of the highly crystalline PP resin. By making the blending ratio of the highly crystalline polypropylene resin the highest in the transparent resin layer 3, the surface strength (scratch resistance) of the decorative sheet can be further improved. In addition, since low crystalline polypropylene resins are highly compatible with high crystalline polypropylene resins, adding a low crystalline polypropylene resin having a tensile modulus within the above range can improve post-processability while imparting high transparency to the transparent resin layer 3. Furthermore, by setting the amount of low crystalline polypropylene resin added within the above range, the scratch resistance and post-processability of the decorative sheet can be improved.

[0030] <Surface protective layer 2> On the outermost surface of the decorative sheet 1, a surface protective layer 2 is provided which serves to protect the surface and adjust the luster. The material for the surface protection layer 2 can be appropriately selected from polyurethane, acrylic silicone, fluorine, epoxy, vinyl, polyester, melamine, aminoalkyd, urea, etc. The form of the material is not particularly limited and may be water-based, emulsion, solvent-based, etc. The curing method may be appropriately selected from one-liquid type, two-liquid type, ultraviolet curing method, etc.

[0031] In particular, a urethane-based resin using isocyanate is suitable as the main component of the surface protective layer 2 in terms of workability, cost, and the cohesive strength of the resin itself. The isocyanate can be appropriately selected from tolylene diisocyanate (TDI), xylylene diisocyanate (XDI), hexamethylene diisocyanate (HMDI), diphenylmethane diisocyanate (MDI), lysine diisocyanate (LDI), isophorone diisocyanate (IPDI), methylhexane diisocyanate (HTDI), methylcyclohexanone diisocyanate (HXDI), trimethylhexamethylene diisocyanate (TMDI), etc., but hexamethylene diisocyanate (HMDI) having a linear molecular structure is suitable in terms of weather resistance. In addition, when improving the surface hardness, it is preferable to use a resin that is cured by active energy rays such as ultraviolet rays and electron beams. These resins can be used in combination with one another. For example, a hybrid type of a thermosetting resin and a photocurable resin can be used, which can improve surface hardness, suppress shrinkage upon curing, and improve adhesion.

[0032] <Hidden Layer 7> The concealing layer 7 is formed by printing in the same manner as the picture pattern layer 5, for example, for the purpose of maintaining the concealing property. As the pigment to be added to the ink, it is preferable to use an opaque pigment, titanium oxide, iron oxide, etc. It is also possible to add metals such as gold, silver, copper, and aluminum to improve the concealing property. Generally, flake-shaped aluminum is added. Note that the concealing layer 7 can be omitted when the base layer 6 is opaque and has concealing property.

[0033] <Primer layer 8> The primer layer 8 is formed in order to improve the adhesion to the substrate B. When the substrate B is a wood-based substrate, the primer layer 8 may be made of, for example, an ester resin, a urethane resin, an acrylic resin, a polycarbonate resin, a vinyl chloride-vinyl acetate copolymer, a polyvinyl butyral resin, a nitrocellulose resin, etc., and these resins may be used alone or in combination to form an adhesive composition, which may be formed by a suitable coating method such as roll coating or gravure printing. In this case, the resin constituting the primer layer 8 is preferably a urethane-acrylate resin, i.e., it is particularly preferable to form the primer layer from a resin consisting of a copolymer of an acrylic resin and a urethane resin, and an isocyanate.

[0034] <Base material B> In this embodiment, the decorative sheet 1 may be laminated to a substrate B to form a decorative member 10. The decorative member 10 according to this embodiment includes a substrate B and a decorative sheet 1 provided on at least one surface of the substrate B. The substrate B in the decorative member 10 may be, for example, a wood-based substrate such as MDF (Medium Density Fiberboard), particle board, or plywood. The substrate B may also be a metal substrate such as a steel plate or an aluminum plate, or a resin substrate such as PET, PVC, or ABS. By laminating the decorative sheet 1 onto the substrate B, a decorative member 11 can be obtained that has a transparent resin layer that is excellent in bender bending processability (post-processability) while maintaining scratch resistance, film formability, and transparency required for practical use.

[0035] <Effects of this embodiment> (1) The decorative sheet 1 of this embodiment is a decorative sheet having a transparent resin layer 3 formed from a resin composition containing multiple types of polypropylene resins, and the resin composition includes high crystalline polypropylene, low crystalline polypropylene and random polypropylene as the multiple types of polypropylene resins, and the blending ratio of each of the multiple types of polypropylene resins based on the mass of the resin composition is in the range of 30% to 60% by mass for the high crystalline polypropylene, 30% to 50% by mass for the low crystalline polypropylene, and 10% to 20% by mass for the random polypropylene. According to this configuration, it is possible to provide a decorative sheet having a transparent resin layer 3 that is excellent in bender bending processability (post-processability) while maintaining the scratch resistance, film-forming property, and transparency required for practical use. (2) In the decorative sheet 1, the MFR (melt flow rate) at 230° C. of the random polypropylene in the transparent resin layer 3 is within the range of 10 g / 10 min to 50 g / 10 min. According to this configuration, the compatibility of the three types of PP resins in a molten state can be increased, and the film-forming properties of the transparent resin layer 3 can be improved.

[0036] (3) In the decorative sheet 1, the low crystalline polypropylene in the transparent resin layer 3 has a mesopentad fraction of 20% or more and 60% or less. According to this configuration, when low crystalline polypropylene is added to high crystalline polypropylene, it has the properties of high compatibility and slowing down the crystallization rate, while having no effect on the crystallization degree of the high crystalline polypropylene or the effect on the crystallization degree is significantly reduced. (4) In the decorative sheet 1, the low crystalline polypropylene in the transparent resin layer 3 has a MFR (melt flow rate) at 230° C. of 30 g / 10 min or more and 100 g / 10 min or less. According to this configuration, similar to (3) above, when low crystalline polypropylene is added to high crystalline polypropylene, it has the properties of high compatibility and slowing down the crystallization rate, while either not affecting the crystallization degree of the high crystalline polypropylene or the effect on the crystallization degree is significantly reduced. (5) In the decorative sheet 1, the low crystalline polypropylene in the transparent resin layer 3 has a mass average molecular weight (Mw) of 10,000 or more and 500,000 or less. According to this configuration, similar to (3) and (4) above, when low crystalline polypropylene is added to high crystalline polypropylene, it has the properties of high compatibility and slowing down the crystallization rate, while having no effect on the crystallization degree of the high crystalline polypropylene or the effect on the crystallization degree is significantly reduced. (6) In the decorative sheet 1, the molecular weight distribution (Mw / Mn) of the low crystalline polypropylene in the transparent resin layer 3 is less than 4. According to this configuration, similar to (3) to (5) above, when low crystalline polypropylene is added to high crystalline polypropylene, it has the properties of high compatibility and slowing down the crystallization rate, while having no effect on the crystallinity of the high crystalline polypropylene or the effect on the crystallinity is significantly reduced. (7) In the decorative sheet 1, the low crystalline polypropylene in the transparent resin layer 3 has a melting point, which is defined as the peak top of the peak observed on the highest temperature side of a melting endothermic curve obtained by holding the material at -10°C for 5 minutes in a nitrogen atmosphere and then raising the temperature at 10°C / min using a differential scanning calorimeter (DSC), of 0°C or more and 120°C or less. According to this configuration, similar to (3) to (6) above, when low crystalline polypropylene is added to high crystalline polypropylene, it has the properties of high compatibility and slowing down the crystallization rate, while either not affecting the crystallinity of the high crystalline polypropylene or significantly reducing the effect on the crystallinity.

[0037] (8) The decorative member 10 according to this embodiment includes a base material B and a decorative sheet 1 provided on at least one surface of the base material B. According to this configuration, it is possible to provide a decorative member having a transparent resin layer that has excellent bender bending processability (post-processability) while maintaining the scratch resistance, film-formability, and transparency required for practical use. (9) In the manufacturing method of the decorative sheet 1 according to this embodiment, the transparent resin layer 3 is formed using the resin composition containing the multiple types of polypropylene resins, the multiple types of polypropylene resins being the high crystalline polypropylene, the low crystalline polypropylene and random polypropylene, and the blending ratio of each of the multiple types of polypropylene resins based on the mass of the resin composition is such that the high crystalline polypropylene is in the range of 30% to 60% by mass, the low crystalline polypropylene is in the range of 30% to 50% by mass, and the random polypropylene is in the range of 10% to 20% by mass. According to this configuration, it is possible to provide a manufacturing method for a decorative sheet having a transparent resin layer 3 that has excellent bender bending processability (post-processability) while maintaining the scratch resistance, film-forming property, and transparency required for practical use.

[0038] <Example> The present disclosure will be described in detail below with reference to examples and comparative examples, but the present disclosure is not limited to the following examples.

[0039] The high crystalline polypropylene resin and low crystalline polypropylene resin used in this example were as follows.

[0040] (Highly crystalline polypropylene resin) A highly crystalline homopolypropylene resin with a pentad fraction of 97.8%, MFR (melt flow rate) of 15 g / 10 min (230°C), and molecular weight distribution MWD (Mw / Mn) of 2.3 was used. In addition, 500 PPM of a hindered phenol-based antioxidant (Irganox 1010: manufactured by BASF), 2000 PPM of a benzotriazole-based ultraviolet absorber (Tinuvin 328: manufactured by BASF), and 2000 PPM of a hindered amine-based light stabilizer (Chimasorb 944: manufactured by BASF) were added to the highly crystalline polypropylene resin.

[0041] (Low crystalline polypropylene resin) The composition of the low crystalline polypropylene resin AC used in this example is shown in Table 1.

[0042] [Table 1]

[0043] (Random polypropylene resin) "Prime Polypro Y-2045GP (MFR 24g / 10min (230℃), tensile modulus 650MPa)" and "Prime Polypro S235WC (MFR 11g / 10min (230℃), tensile modulus 650MPa)" (both manufactured by Prime Polymer) were used. In addition, a random polypropylene resin with an MFR (melt flow rate) of 50g / 10min (230℃) was used.

[0044] Example 1 The decorative sheet 1 had a transparent resin layer 3 formed using a resin composition containing multiple types of polypropylene resins (high crystalline polypropylene resin, low crystalline polypropylene resin, and random polypropylene resin). The basic method for producing a decorative sheet is as follows.

[0045] The high crystalline PP resin, the low crystalline PP resin A shown in Table 1, and the random PP resin (MFR: 24 g / 10 min (230°C)) were mixed and melted to form a resin composition. The blending ratio (addition amount) of each PP resin in the resin composition was 60 mass% for the high crystalline PP resin, 30 mass% for the low crystalline PP resin, and 10 mass% for the random PP resin, based on the resin composition. More specifically, the above three types of PP resins were mixed in the above-mentioned blending ratios MR1, MR2, and MR3, and extruded using a melt extruder to produce a transparent resin sheet made of polypropylene resin having a thickness of 80 μm as a resin composition to be used as the transparent resin layer 3. Thus, with regard to the blending ratios of each of the multiple types of polypropylene resins based on the mass of the above resin composition, the blending ratio MR1 of the high crystalline PP resin is in the range of 30% by mass to 60% by mass or less, the blending ratio MR2 of the low crystalline polypropylene is in the range of 30% by mass to 50% by mass or less, and the blending ratio MR3 of the random polypropylene is in the range of 10% by mass to 20% by mass or less.

[0046] Both sides of the obtained transparent resin sheet were subjected to a corona treatment to set the wetting tension of the transparent resin sheet surface to 40 dyn / cm or more. On the other hand, on one side of a 70 μm polyethylene sheet (substrate layer 6) having a concealing property, a picture was printed by a gravure printing method using an ink obtained by adding 0.5 mass % of a hindered amine light stabilizer (Chimasorb 944; BASF) to a two-liquid type urethane ink (V180; manufactured by Toyo Ink Mfg. Co., Ltd.) based on the binder resin content of the ink, to form a picture pattern layer 5.

[0047] A primer layer 8 was provided on the other surface of the base layer 6. Thereafter, a dry lamination adhesive (Takelac A540, manufactured by Mitsui Chemicals, Inc.; coating amount 2 g / m) was applied to one surface of the base layer 6 as the adhesive layer 4. 2 A transparent resin layer 3 was laminated to the transparent resin layer 3 by a dry lamination method with a 100% polyester resin interposed therebetween. Then, an embossed pattern 3a was formed on the surface of the transparent resin layer 3, and then a two-component curing urethane top coat (W184; manufactured by DIC Graphics) was applied to a thickness of 6 g / m 2 to form a surface protective layer 2, thereby obtaining a decorative sheet of the present disclosure shown in FIG. 1 having a total thickness of 170 μm.

[0048] Example 2 The above-mentioned random PP resin (MFR 11 g / 10 min (230° C.)) was added to the transparent resin layer 3. Except for that, the same procedure as in Example 1 was carried out to obtain a decorative sheet according to Example 2. Example 3 The above-mentioned random PP resin (MFR 50 g / 10 min (230° C.)) was added to the transparent resin layer 3. Except for that, the same procedure as in Example 1 was carried out to obtain a decorative sheet according to Example 3.

[0049] Example 4 The low-crystalline PP resin added to the transparent resin layer 3 was low-crystalline PP resin B shown in Table 1. Except for this, the same procedure as in Example 1 was carried out to obtain a decorative sheet according to Example 4. Example 5 The low-crystalline PP resin added to the transparent resin layer 3 was low-crystalline PP resin C shown in Table 1. Except for this, the same procedure as in Example 1 was carried out to obtain a decorative sheet according to Example 5.

[0050] Example 6 The blending ratios (addition amounts) of each PP resin in the above resin composition forming the transparent resin layer 3 were set to 50 mass% for the high crystalline PP resin MR1, 30 mass% for the low crystalline PP resin MR2, and 20 mass% for the random PP resin MR3, based on the above resin composition. Otherwise, a decorative sheet according to Example 6 was obtained in the same manner as in Example 1. Example 7 The low-crystalline PP resin added to the transparent resin layer 3 was low-crystalline PP resin B shown in Table 1. Except for this, the same procedure as in Example 6 was carried out to obtain a decorative sheet according to Example 7. Example 8 The low-crystalline PP resin added to the transparent resin layer 3 was low-crystalline PP resin C shown in Table 1. Except for this, the same procedure as in Example 6 was carried out to obtain a decorative sheet according to Example 8.

[0051] Example 9 The blending ratios (addition amounts) of each PP resin in the above resin composition forming the transparent resin layer 3 were set to 40 mass% for the high crystalline PP resin MR1, 50 mass% for the low crystalline PP resin MR2, and 10 mass% for the random PP resin MR3, based on the above resin composition. Otherwise, a decorative sheet according to Example 9 was obtained in the same manner as in Example 1. Example 10 The low-crystalline PP resin added to the transparent resin layer 3 was low-crystalline PP resin B shown in Table 1. Except for this, the same procedure as in Example 9 was carried out to obtain a decorative sheet according to Example 10. Example 11 The low-crystalline PP resin added to the transparent resin layer 3 was low-crystalline PP resin C shown in Table 1. Except for this, the same procedure as in Example 9 was carried out to obtain a decorative sheet according to Example 11.

[0052] Example 12 The blending ratios (addition amounts) of each PP resin in the above resin composition forming the transparent resin layer 3 were set to 30 mass% for the high crystalline PP resin MR1, 50 mass% for the low crystalline PP resin MR2, and 20 mass% for the random PP resin MR3, based on the above resin composition. Otherwise, a decorative sheet according to Example 12 was obtained in the same manner as in Example 1. (Example 13) The low-crystalline PP resin added to the transparent resin layer 3 was low-crystalline PP resin B shown in Table 1. Except for this, the same procedure as in Example 12 was carried out to obtain a decorative sheet according to Example 13. Example 14 The low-crystalline PP resin added to the transparent resin layer 3 was low-crystalline PP resin C shown in Table 1. Except for this, the same procedure as in Example 12 was carried out to obtain a decorative sheet according to Example 14.

[0053] Example 15 The blending ratios (addition amounts) of each PP resin in the above resin composition forming the transparent resin layer 3 were set to 40 mass% for the high crystalline PP resin MR1, 40 mass% for the low crystalline PP resin MR2, and 20 mass% for the random PP resin MR3, based on the above resin composition. Otherwise, a decorative sheet according to Example 15 was obtained in the same manner as in Example 1. (Example 16) The low-crystalline PP resin added to the transparent resin layer 3 was low-crystalline PP resin B shown in Table 1. Except for this, the same procedure as in Example 15 was carried out to obtain a decorative sheet according to Example 16. (Example 17) The low-crystalline PP resin added to the transparent resin layer 3 was low-crystalline PP resin C shown in Table 1. Except for this, the same procedure as in Example 15 was carried out to obtain a decorative sheet according to Example 17.

[0054] Comparative Example 1 The blending ratios (addition amounts) of each PP resin in the resin composition forming the transparent resin layer were set to 20 mass% for the high crystalline PP resin MR1, 50 mass% for the low crystalline PP resin MR2, and 30 mass% for the random PP resin MR3, based on the resin composition.Other than that, a decorative sheet according to Comparative Example 1 was obtained in the same manner as in Example 1. Comparative Example 2 The low-crystalline PP resin added to the transparent resin layer was low-crystalline PP resin B shown in Table 1. Except for this, the decorative sheet according to Comparative Example 2 was obtained in the same manner as in Comparative Example 1. Comparative Example 3 The low-crystalline PP resin added to the transparent resin layer was low-crystalline PP resin C shown in Table 1. Except for this, the same procedure as in Comparative Example 1 was carried out to obtain a decorative sheet according to Comparative Example 3.

[0055] Comparative Example 4 The blending ratios (addition amounts) of each PP resin in the resin composition forming the transparent resin layer were set to 70% by mass for the high crystalline PP resin MR1, 20% by mass for the low crystalline PP resin MR2, and 10% by mass for the random PP resin MR3, based on the resin composition.Other than that, a decorative sheet according to Comparative Example 4 was obtained in the same manner as in Example 1. Comparative Example 5 The low-crystalline PP resin added to the transparent resin layer was low-crystalline PP resin B shown in Table 1. Except for this, the same procedure as in Comparative Example 4 was carried out to obtain a decorative sheet according to Comparative Example 5. Comparative Example 6 The low-crystalline PP resin added to the transparent resin layer was low-crystalline PP resin C shown in Table 1. Except for this, the decorative sheet according to Comparative Example 6 was obtained in the same manner as in Comparative Example 4.

[0056] Comparative Example 7 The blending ratios (addition amounts) of each PP resin in the resin composition forming the transparent resin layer were set to 30 mass% for the high crystalline PP resin MR1, 60 mass% for the low crystalline PP resin MR2, and 10 mass% for the random PP resin MR3, based on the resin composition.Other than that, a decorative sheet according to Comparative Example 7 was obtained in the same manner as in Example 1. Comparative Example 8 The low-crystalline PP resin added to the transparent resin layer was low-crystalline PP resin B shown in Table 1. Except for this, the same procedure as in Comparative Example 7 was carried out to obtain a decorative sheet according to Comparative Example 8. Comparative Example 9 The low-crystalline PP resin added to the transparent resin layer was low-crystalline PP resin C shown in Table 1. Except for this, the same procedure as in Comparative Example 7 was carried out to obtain a decorative sheet according to Comparative Example 9.

[0057] Comparative Example 10 The blending ratios (addition amounts) of each PP resin in the resin composition forming the transparent resin layer were set to 45 mass% for the high crystalline PP resin MR1, 50 mass% for the low crystalline PP resin MR2, and 5 mass% for the random PP resin MR3, based on the resin composition.Other than that, a decorative sheet according to Comparative Example 10 was obtained in the same manner as in Example 1. Comparative Example 11 The low-crystalline PP resin added to the transparent resin layer was low-crystalline PP resin B shown in Table 1. Except for this, the same procedure as in Comparative Example 10 was carried out to obtain a decorative sheet according to Comparative Example 11. Comparative Example 12 The low-crystalline PP resin added to the transparent resin layer was low-crystalline PP resin C shown in Table 1. Except for this, the same procedure as in Comparative Example 10 was carried out to obtain a decorative sheet according to Comparative Example 12.

[0058] <Performance evaluation> The decorative sheets of each Example and each Comparative Example were evaluated for film-forming properties, transparency, scratch resistance, and post-processability. The results are shown in Table 2 together with the configuration of the transparent resin layer.

[0059] [Table 2]

[0060] [Film forming property] The state of the transparent resin sheet during melt extrusion was visually observed. The evaluation was carried out in the following two stages. ◎: Good (no neck-in or film breakage was observed) ×: Poor (neck-in or film breakage was observed) [Transparency] The produced transparent resin layer 3 was visually observed and evaluated based on the visibility of the underlying picture pattern. The evaluation was carried out on the following three levels. ◎: Good (transparent) ◯: No problem with design, but slightly cloudy (not a problem in practical use) ×: Poor (cloudy) [Scratch resistance] The hardness was evaluated by a pencil hardness test. First, the decorative sheet 1 of each of the examples and comparative examples prepared by the above method was attached to one side of a 0.5 mm thick steel plate constituting the base material B using an adhesive for steel plates to form a decorative member. The test method was in accordance with JIS-K5600, and the evaluation method was as follows: if the maximum hardness at which the surface of the transparent resin layer 3 was not dented was 2B or higher, it was marked as "◎", if it was 3B, it was marked as "○", and if it was 4B or lower, it was marked as "×".

[0061] [Post-processability] The bending property was evaluated by a bender bending workability test. The detailed method of the bender bending workability test is described below. First, the decorative sheet 1 of each of the examples and comparative examples prepared by the above method was attached to one side of a 0.5 mm thick steel plate constituting the base material B using a steel plate adhesive to form a decorative member. The decorative member was folded toward the base material B at a curvature radius of 0.5 mm and an angle of 90 degrees using a folding tester "Bending Machine EG-4010 (manufactured by Amada Co., Ltd.)". Thereafter, the presence or absence of appearance changes such as whitening or cracks in the folded portion of the surface of the decorative sheet 1 was observed using an optical microscope "Digital Microscope VHX-970F (manufactured by Keyence Co., Ltd.)" to evaluate the post-bending processability. The evaluation was performed on the following three levels. ◎: No changes in appearance such as whitening or cracks were observed ◯: Slight whitening and cracks are observed, but at a level that does not pose a problem for practical use. ×: Whitening or cracking that is unacceptable for a decorative sheet was observed.

[0062] As shown in Examples 1-17 in Table 2, the blend ratios of each of the three types of polypropylene resins based on the mass of the above resin composition are such that the high crystalline PP resin is in the range of 30% by mass to 60% by mass, the low crystalline PP resin is in the range of 30% by mass to 50% by mass, and the random PP resin is in the range of 10% by mass to 20% by mass, thereby making it possible to obtain a decorative sheet having a transparent resin layer that has excellent bender bending processability (post-processability) while maintaining the scratch resistance, film-formability, and transparency required for practical use.

[0063] On the other hand, in the decorative sheet of Comparative Example 1-3, the blending ratio of highly crystalline PP resin was less than 30% by mass, resulting in poor scratch resistance, and furthermore, the blending ratio of random PP resin exceeded 20% by mass, causing the transparent resin layer to become cloudy. In addition, in the decorative sheet of Comparative Example 4-6, the blending ratio of high crystallinity PP resin exceeded 60 mass% and the blending ratio of low crystallinity PP resin was less than 30 mass%, so whitening and cracks occurred when bending with a bender. In addition, in the decorative sheet of Comparative Example 7-9, the blending ratio of the low crystalline PP resin exceeds 50 mass %, so necking occurs during melt extrusion, resulting in poor film formation. In addition, in the decorative sheets of Comparative Examples 10-12, the blending ratio of the random PP resin was less than 10% by mass, so necking occurred during melt extrusion, resulting in poor film formation.

[0064] The decorative sheet and decorative material of the present disclosure are not limited to the above-described embodiments and examples, and various modifications are possible without departing from the characteristics of the invention.

[0065] Furthermore, for example, the present disclosure can have the following configuration. (1) A decorative sheet having a transparent resin layer formed of a resin composition containing multiple types of polypropylene resins, The resin composition includes a high crystalline polypropylene, a low crystalline polypropylene, and a random polypropylene as the multiple types of polypropylene resins, The blending ratio of each of the multiple polypropylene resins based on the mass of the resin composition is in the range of 30% by mass to 60% by mass or less of the high crystalline polypropylene, in the range of 30% by mass to 50% by mass or less of the low crystalline polypropylene, and in the range of 10% by mass to 20% by mass or less of the random polypropylene. A decorative sheet characterized by: (2) The random polypropylene has a melt flow rate (MFR) at 230° C. in the range of 10 g / 10 min to 50 g / 10 min. 4. The decorative sheet according to claim 1, (3) The decorative sheet according to (1) or (2) above, wherein the low crystalline polypropylene has a mesopentad fraction of 20% or more and 60% or less. (4) The decorative sheet according to any one of (1) to (3) above, wherein the low crystalline polypropylene has a melt flow rate (MFR) at 230° C. of 30 g / 10 min or more and 100 g / 10 min or less. (5) 5. The decorative sheet according to claim 1, wherein the low crystalline polypropylene has a mass average molecular weight (Mw) of 10,000 or more and 500,000 or less. (6) The decorative sheet according to any one of (1) to (5) above, wherein the molecular weight distribution (Mw / Mn) of the low crystalline polypropylene is less than 4. (7) The decorative sheet according to any one of (1) to (6) above, characterized in that the low crystalline polypropylene has a melting point, defined as the peak top of the peak observed on the highest temperature side of a melting endothermic curve obtained by holding the polypropylene at -10°C for 5 minutes in a nitrogen atmosphere and then heating the polypropylene at a rate of 10°C / min using a differential scanning calorimeter (DSC), of 0°C or higher and 120°C or lower. (8) A substrate; and a decorative sheet according to any one of (1) to (7) above, provided on at least one surface side of the substrate. A decorative member characterized by: (9) A method for producing a decorative sheet according to any one of (1) to (7) above, The transparent resin layer is formed using the resin composition containing the multiple types of polypropylene resins, the multiple types of polypropylene resins are the high crystalline polypropylene, the low crystalline polypropylene, and the random polypropylene, The blending ratio of each of the multiple polypropylene resins based on the mass of the resin composition is set to a range of 30% by mass to 60% by mass or less of the high crystalline polypropylene, 30% by mass to 50% by mass or less of the low crystalline polypropylene, and 10% by mass to 20% by mass or less of the random polypropylene. A method for producing a decorative sheet comprising the steps of: [Explanation of symbols]

[0066] 1 Decorative sheet 2 Surface protective layer 3 Transparent resin layer 3a Embossed pattern 4 Adhesive layer 5. Pattern layer 6 Base material layer 7 Hidden Layer 8 Primer layer 10. Decorative materials B Base material

Claims

1. A decorative sheet having a transparent resin layer formed of a resin composition containing multiple types of polypropylene resins, The resin composition includes a high crystalline polypropylene, a low crystalline polypropylene, and a random polypropylene as the multiple types of polypropylene resins, The blending ratio of each of the multiple polypropylene resins based on the mass of the resin composition is in the range of 30 mass% to 60 mass% or less of the high crystalline polypropylene, in the range of 30 mass% to 50 mass% or less of the low crystalline polypropylene, and in the range of 10 mass% to 20 mass% of the random polypropylene. A decorative sheet characterized by:

2. The random polypropylene has an MFR (melt flow rate) at 230° C. in the range of 10 g / 10 min to 50 g / 10 min.

2. The decorative sheet according to claim 1.

3. 3. The decorative sheet according to claim 2, wherein the low crystalline polypropylene has a mesopentad fraction of 20% or more and 60% or less.

4. 4. The decorative sheet according to claim 3, wherein the low crystalline polypropylene has a melt flow rate (MFR) at 230° C. of 30 g / 10 min or more and 100 g / 10 min or less.

5. 5. The decorative sheet according to claim 4, wherein the low crystalline polypropylene has a mass average molecular weight (Mw) of 10,000 or more and 500,000 or less.

6. 6. The decorative sheet according to claim 5, wherein the molecular weight distribution (Mw / Mn) of the low crystalline polypropylene is less than 4.

7. The decorative sheet according to claim 6, characterized in that the low crystalline polypropylene has a melting point, which is defined as the peak top of the peak observed on the highest temperature side of a melting endothermic curve obtained by holding the polypropylene at -10°C for 5 minutes in a nitrogen atmosphere and then raising the temperature at a rate of 10°C / min using a differential scanning calorimeter (DSC), of 0°C or more and 120°C or less.

8. A substrate; The decorative sheet according to any one of claims 1 to 7 provided on at least one surface side of the substrate. A decorative member characterized by:

9. A method for producing a decorative sheet according to any one of claims 1 to 7, comprising the steps of: The transparent resin layer is formed using the resin composition containing the multiple types of polypropylene resins, the multiple types of polypropylene resins are the high crystalline polypropylene, the low crystalline polypropylene, and the random polypropylene, The blending ratio of each of the plurality of polypropylene resins based on the mass of the resin composition is such that the high crystalline polypropylene is in the range of 30% by mass to 60% by mass, the low crystalline polypropylene is in the range of 30% by mass to 50% by mass, and the random polypropylene is in the range of 10% by mass to 20% by mass. A method for producing a decorative sheet comprising the steps of:

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