decorative sheet

Abstract

To provide a decorative sheet which has low gloss due to a matte effect and has excellent appearance even when heat-stretched. [Solution] The decorative sheet 1 comprises a substrate 2 and a surface layer 3 which is an excimer light irradiated material provided on the surface of the substrate 2, the thickness of the surface layer 3 being 5 to 10 μm, the 20° gloss of the surface layer 3 at 23°C being 1 or less and the 60° gloss of the surface layer 3 being 10 or less, and when stretched at a stretching temperature of 80°C, the difference between the 60° gloss of the surface layer 3 at 23°C before stretching and the 60° gloss of the surface layer 3 after stretching is 1.5 or less.

Description

Technical Field

[0001] The present invention relates to a decorative sheet.

Background Art

[0002] In various applications such as wall materials, joinery materials, building fixtures, etc., surface decoration of furniture, etc., and interior decoration of automobiles and surface decoration of weak electricity, decorative sheets are used to enhance the design by applying surface decoration. As such a decorative sheet, for example, a sheet provided with a layer having a low gloss (gloss elimination) effect on a base material is known.

[0003] For example, a decorative sheet having a decorative layer containing a coloring material on a base material and a clear layer containing wet gel method silica particles having an average particle diameter of 5 μm or less measured by the Coulter counter method (AP50 μm) on the decorative layer has been proposed. And it is described that with such a configuration, even when having a clear layer containing inorganic particles, a decorative sheet that can suitably retain the color tone of the coloring layer and has a good matte surface can be provided (for example, see Patent Document 1).

[0004] Also, a decorative sheet has been proposed in which excimer light irradiated from an excimer lamp is irradiated onto the surface of a coating film structure provided on a base material, and the gloss of the irradiated portion of electromagnetic waves on the surface of the coating film structure is reduced compared to before the irradiation of electromagnetic waves. And it is described that with such a configuration, a decorative sheet having regions with different matte feelings can be provided (for example, see Patent Document 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, the decorative sheet described in Patent Document 1 above has the problem that, because it merely incorporates silica particles into the clear layer, it does not provide a sufficient matte effect and does not easily exhibit low gloss.

[0007] Furthermore, in the decorative sheet described in Patent Document 2, silica particles or the like are not incorporated into the clear layer, and it is merely irradiated with excimer light, so a sufficient matte effect cannot be obtained, and an uneven surface is formed in the clear layer, which has the problem of reduced aesthetic appeal (design).

[0008] Furthermore, these heat-treated sheets had the problem that large cracks affecting the appearance were formed during the heat stretching process, making it impossible to obtain decorative sheets with superior aesthetics.

[0009] Therefore, the present invention has been made in view of the above problems, and aims to provide a decorative sheet that has low gloss due to a matte effect and maintains excellent aesthetics even when heat stretched. [Means for solving the problem]

[0010] To achieve the above objective, the decorative sheet of the present invention comprises a base material and a surface layer which is an excimer light irradiated material provided on the surface of the base material. The surface layer consists of a cured product of a paint mainly composed of urethane acrylate. The surface layer thickness is 5-10 μm, the 20° gloss of the surface layer at 23°C is 1 or less, the 60° gloss is 10 or less, and the stretching temperature is 80°C. Under conditions of a tensile speed of 300 mm / min and a chuck distance of 80 mm, 100% in the long-side direction When stretched, the difference between the 60° gloss of the surface layer at 23°C before stretching and the 60° gloss of the surface layer after stretching is 1.5 or less. Furthermore, the ratio of the 60° gloss of the surface layer after stretching to the 60° gloss of the surface layer at 23°C before stretching is 0.8 or less. It is characterized by the following:

[0011] Furthermore, another decorative sheet of the present invention comprises a base material and a surface layer which is an excimer light irradiated material provided on the surface of the base material. The surface layer consists of a cured product of a paint mainly composed of urethane acrylate.The thickness of the surface layer is 5 to 10 μm, the 20° glossiness of the surface layer at 23°C is 1 or less, the 60° glossiness is 10 or less, and the value obtained by subtracting the 20° glossiness of the surface layer at 23°C from the 85° glossiness of the surface layer at 23°C is 0 or more and 8 or less. When stretched at a stretching temperature of 90°C Under conditions of a tensile speed of 300 mm / min and a chuck distance of 80 mm, 100% in the long-side direction When stretched, the value obtained by subtracting the 20° glossiness of the surface layer after stretching from the 85° glossiness of the surface layer after stretching is 0 or more and 4 or less.

Effect of the Invention

[0012] According to the present invention, it is possible to provide a decorative sheet having low glossiness due to a matte effect and excellent aesthetics even when heat stretching is performed.

Brief Description of the Drawings

[0013] [Figure 1] It is a cross-sectional view showing a decorative sheet according to an embodiment of the present invention. [Figure 2] It is a laser microscope photograph showing the surface state of the surface layer of the decorative sheet of Example 1. [Figure 3] It is a laser microscope photograph showing the surface state of the surface layer of the decorative sheet of Example 1 (heated and stretched at a stretching temperature of 80°C).

Mode for Carrying Out the Invention

[0014] Hereinafter, the decorative sheet of the present invention will be specifically described. Note that the present invention is not limited to the following embodiments, and can be appropriately changed and applied without changing the gist of the present invention.

[0015] <Decorative Sheet> As shown in FIG. 1, the decorative sheet 1 of the present invention includes a base material 2 and a surface layer 3 provided on the surface 2a of the base material 2.

[0016] <Base Material> The base material 2 is made of, for example, a thermoplastic resin sheet, and as this thermoplastic resin sheet, those commonly used for the base material in the decorative sheet 1 can be used. Specific examples include, for example, a polyvinyl chloride (PVC) sheet, a glycol-modified polyethylene terephthalate (PETG) sheet, an amorphous crystalline polyester resin (APET) sheet, a polyolefin sheet (a polyethylene sheet, a polypropylene sheet, etc.), an acrylonitrile-butadiene-styrene resin (ABS) sheet, a polycarbonate sheet, and the like. Further, as the amorphous crystalline polyester resin (APET) sheet used for the base material 2, a recycled polyethylene terephthalate (RPET) sheet made from PET bottles or the like as a raw material can be mentioned.

[0017] In addition, as the thermoplastic resin sheet, from the viewpoint of being easy to perform secondary surface processing and having excellent three-dimensional formability, a glycol-modified polyethylene terephthalate sheet is preferable. The glycol-modified polyethylene terephthalate sheet is a kind of polyethylene terephthalate. While the glycol component of polyethylene terephthalate is ethylene glycol, as the glycol component, in addition to ethylene glycol, it is an amorphous polyester containing a diol other than ethylene glycol (1,4-cyclohexanedimethanol).

[0018] Further, the thermoplastic resin sheet may be a stretched sheet or an unstretched sheet. Further, the thermoplastic resin sheet may contain additives such as a colorant, an ultraviolet absorber, a light stabilizer, an antioxidant, an antistatic agent, a storage stabilizer, a lubricant, and a filler, as necessary. Note that from the viewpoint of design, the thermoplastic resin sheet is preferably colored.

[0019] The thickness of the base material 2 is not particularly limited, but is preferably 50 to 800 μm, and more preferably 250 to 500 μm. If the thickness of the base material 2 is 50 μm or more, the mechanical strength and concealability can be sufficiently improved. Further, if the thickness of the base material 2 is 800 μm or less, the three-dimensional formability is more excellent, and it becomes easier to ensure flexibility and printing suitability.

[0020] <Surface layer> The surface layer 3 is a coating film of paint mainly composed of urethane acrylate. This surface layer 3 can be formed by coating the paint onto the surface 2a of the substrate 2 and curing it, and the surface layer 3 is formed from the cured paint product. Furthermore, as shown in Figure 1, wrinkles are formed on the surface 3a of the surface layer 3 (i.e., the surface opposite to the substrate 2 side).

[0021] As urethane acrylates, those with 2 to 10 functionalities are used, for example, phenylglycamicyl ether acrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, and dipentaerythritol pentaacrylate hexamethylene diisocyanate urethane prepolymer. Also, EBECRYL8402, KRM8452, EBECRYL210, EBECRYL220, EBECRYL4500, EBECRYL230, EBECRLY270, EBECRYL4858, EBECRYL8804, EBECRYL8807, EBECRYL9270, EBECRYL4100, EBECRYL4513, EBECRYL8311, EBECRYL8465, EBECRYL9260, and EBECRYL87 Commercially available products such as 01, KRM8667, EBECRYL4265, EBECRYL4587, EBECRYL4200, EBECRYL8210, EBECRYL1290, EBECRYL5129, EBECRYL5129, EBECRYL8254, EBECRYL8301R, KRM8200, KRM8904, U-6LPA, UA-1100H, U-200PA, and UA-160TM (all product names) can be used. These urethane acrylates may be used individually or in combination of two or more types.

[0022] Furthermore, the surface layer 3 may contain a monofunctional acrylate. Examples of monofunctional acrylates include ethyl carbitol acrylate, methoxyethylene glycol (meth)acrylate, methoxypolyethylene glycol (meth)acrylate, β-(meth)acryloyloxyethyl hydrogen phthalate, β-(meth)acryloyloxyethyl hydrogen succinate, nonylphenoxyethyl (meth)acrylate, 3-chloro-2-hydroxypropyl (meth)acrylate, phenoxyethyl (meth)acrylate, and phenoxypolyethylene glycol. (meth)acrylate, butoxypolyethylene glycol (meth)acrylate, alkyl (meth)acrylate, cyclohexyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, isobornyl (meth)acrylate, benzyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, 2-(meth)acryloyloxyethyl-2-hydroxyethylphthalic acid 3-Acryloyloxyglycerin mono(meth)acrylate, 2-Hydroxybutyl(meth)acrylate, 2-Hydroxy-1-(meth)acryloxy-3-(meth)acryloxypropane, Polypropylene glycol mono(meth)acrylate, Polyethylene glycol mono(meth)acrylate, Poly-ε-Caprolactone mono(meth)acrylate, Dialkylaminoethyl(meth)acrylate, Glycidyl(meth)acrylate, Mono[2-(meth)acryloyloxyethyl]acid phosphate Examples include trifluoroethyl (meth)acrylate, 2,2,3,3-tetrafluoropropyl (meth)acrylate, 2,2,3,4,4,4-hexafluorobutyl (meth)acrylate, perfluorooctylethyl (meth)acrylate, dicyclopentenyloxyalkyl (meth)acrylate, dicyclopentenyl (meth)acrylate, tricyclodecanyl (meth)acrylate, tricyclodecanyloxyethyl (meth)acrylate, and isobornyloxyethyl (meth)acrylate. These monofunctional acrylates may be used individually or in combination of two or more.

[0023] Furthermore, the mixing ratio of urethane acrylate and monofunctional acrylate in the surface layer 3 is not particularly limited as long as it does not impair the characteristics of the decorative sheet 1 of the present invention, but a mass ratio of urethane acrylate:monofunctional acrylate = 10:90 to 80:20 is preferred. This is because urethane acrylate has low fluidity, so if the mass ratio of urethane acrylate increases, wrinkles are less likely to occur on the surface 3a of the surface layer 3, and the low gloss due to the matte effect becomes less likely to occur. Also, monofunctional acrylate has low reactivity, so if the mass ratio of monofunctional acrylate increases, the paint is less likely to harden.

[0024] Furthermore, the thickness of the surface layer 3 is not particularly limited, but 1 to 45 μm is preferred. This is because if the thickness of the surface layer 3 is 45 μm or more, the surface roughness increases, which improves fingerprint resistance but may reduce tactile sensitivity.

[0025] Furthermore, from the viewpoint of achieving both scratch resistance and flexibility (heat stretchability), a thickness of 5 to 10 μm is more preferable for the surface layer 3.

[0026] Furthermore, the paint may contain other components besides urethane acrylate and monofunctional acrylate, to the extent that it does not impair the effects of the invention. Examples of other components include polyfunctional acrylate, photopolymerization initiator, colorant, ultraviolet absorber, light stabilizer, antioxidant, antistatic agent, preservative stabilizer, plasticizer, lubricant, filler, and the like.

[0027] Examples of polyfunctional acrylates include dipropylene glycol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, tripropylene glycol diacrylate, EBECRYL145, EBECRYL150, IRR214K, EBECRYL130, trimethylolpropane triacrylate, EBECRYL160S, OTA480, PETIA, PETRA, EBECRYL40, PETA, EBECRYL140, EBECRL1140, EBECRYL1142, DPHA, EBECRYL895, EBECRYL896, ethoxyca bisphenol A diacrylate, and glycerin triacrylate. These polyfunctional acrylates may be used individually or in combination of two or more types.

[0028] Examples of photopolymerization initiators that can be used include alkylphenone-based, acylphosphine oxide-based, and cationic initiators.

[0029] <Manufacturing method> When manufacturing the decorative sheet 1 of the present invention, first, a base material 2 made of the thermoplastic resin sheet described above is prepared. This thermoplastic resin sheet may be a commercially available product, or it may be manufactured by a known manufacturing method such as the calendering method or extrusion molding method.

[0030] Next, a coating containing, for example, urethane acrylate, monofunctional acrylate, and a photopolymerization initiator is applied to the surface 2a of the substrate 2 to form a coating film that will become the surface layer 3 on the surface 2a of the substrate 2.

[0031] Furthermore, for example, when using a 2- to 10-functional urethane acrylate containing a photopolymerization initiator, the use of a monofunctional acrylate can be omitted.

[0032] Furthermore, the method of coating the paint is not particularly limited and includes, for example, the cast coating method, die coating method, gravure coating method, roll knife coating method, reverse roll coating method, roll coating method, and comma coating method.

[0033] Next, the coating film formed on the surface 2a of the substrate 2 is irradiated with excimer light. More specifically, the coating film is irradiated with excimer light having a short peak wavelength (in the range of 120 to 230 nm).

[0034] Furthermore, when irradiating with excimer light using an excimer lamp, the peak wavelength of the electromagnetic wave can be changed by changing the discharge gas filled in the excimer lamp. Examples of discharge gases used to irradiate with excimer light of the above peak wavelength include Ar 2 , Kr 2 Xe 2 The following can be used.

[0035] Then, by irradiating the coating with ultraviolet light (350-450 nm) to harden it, a decorative sheet 1 is manufactured, as shown in Figure 1, in which a surface layer 3 is formed on the surface of the substrate 2, and wrinkles are formed on the surface 3a of the surface layer 3.

[0036] Furthermore, even if the coating is irradiated again with excimer light (within the range of 120-230 nm) instead of the ultraviolet light (350-450 nm) mentioned above, the coating will not completely harden.

[0037] Here, the present inventors investigated conditions that can achieve both low gloss and heat stretchability in the decorative sheet 1. They found that by irradiating the coating film that forms the surface layer 3 with the excimer light described above, the coating film becomes an excimer light-irradiated object, and wrinkles are formed on the surface of the coating film, low gloss can be achieved in the surface layer 3. Furthermore, by controlling the change in gloss during the heat stretching process, it is possible to obtain a decorative sheet with excellent aesthetics even when heat stretching is performed.

[0038] In other words, by irradiating the coating with excimer light, hardening occurs only on the outermost surface of the coating, creating non-uniformity between the surface and the interior of the coating. As a result, coating components move from the unreacted parts inside the coating to the surface, wrinkles are formed on the surface of the coating, and consequently, it becomes possible to control the gloss level of the surface layer 3.

[0039] Furthermore, due to the matting effect caused by the wrinkles described above, the decorative sheet 1 of the present invention has a 20° gloss of 1 or less and a 60° gloss of 10 or less on the surface 3a of the surface layer 3 at 23°C, making it possible to achieve low gloss without adding particles.

[0040] The term "glossiness" used here refers to an indicator of low gloss, and is measured according to the method compliant with JIS Z 8741:1997. For example, "20° glossiness" refers to the glossiness calculated based on the results of measurements taken by a photodetector placed in the direction of the reflection angle when light is incident on the measurement surface (surface 3a of surface layer 3) of the decorative sheet 1 at an incident angle of 20°.

[0041] Furthermore, when the decorative sheet 1 of the present invention is stretched at a stretching temperature of 80°C, the difference between the 60° gloss of the surface 3a of the decorative sheet 1 before stretching (i.e., at 23°C) and the 60° gloss of the surface 3a after stretching is controlled to 1.5 or less, and the ratio of the 60° gloss of the surface 3a after stretching to the 60° gloss of the surface 3a before stretching is controlled to 0.8 or less. As a result, the difference in gloss of the surface layer before and after stretching is reduced, so that even when heat stretching is performed, the formation of large cracks that affect the appearance can be prevented, and as a result, a decorative sheet with excellent aesthetics can be obtained.

[0042] Furthermore, by controlling the value obtained by subtracting the 20° gloss of surface 3a at 23°C from the 85° gloss of surface 3a at 23°C to be between 0 and 8, and by controlling the value obtained by subtracting the 20° gloss of surface 3a at 85°C from the 20° gloss of surface 3a after stretching from 0 to 4 when the decorative sheet 1 of the present invention is stretched at a stretching temperature of 90°C, the change in gloss of the entire decorative sheet before and after stretching is reduced. As a result, even when heat stretching is performed, the formation of large cracks that affect the appearance can be prevented, and a decorative sheet with superior aesthetics can be obtained.

[0043] As described above, the present invention makes it possible to provide a decorative sheet that has low gloss due to a matte effect and maintains excellent aesthetics even when heat stretched. [Examples]

[0044] The present invention will be described below based on examples. However, the present invention is not limited to these examples, and these examples can be modified and altered in accordance with the spirit of the invention; such modifications do not exclude them from the scope of the invention.

[0045] The materials used to manufacture the decorative sheet are listed below. (1) Urethane acrylate - 1:9 functional urethane acrylate (manufactured by Mitsubishi Chemical Corporation, product name: UV-7620EA) (2) Urethane acrylate-2: tetrafunctional urethane acrylate (manufactured by Daicel Ornex Co., Ltd., product name: EBECRYL8606) (3) Urethane acrylate-3: Trifunctional urethane acrylate (manufactured by Asai Bussan Co., Ltd., product name: CH Clear #133-12, photoinitiator: 5% added) (4) Urethane acrylate - 4:2 functional urethane acrylate (manufactured by Daicel Ornex Co., Ltd., product name: EBECRYL8402) (5) Urethane acrylate-5:10 functional urethane acrylate (manufactured by Daicel Ornex Co., Ltd., product name: KRM8452) (6) Monofunctional Acrylate-1: Tetrahydrofurfuryl Acrylate (manufactured by Tokyo Chemical Industry Co., Ltd., trade name: Tetrahydrofurfuryl Acrylate) (7) Initiator: Alkylphenone-based photopolymerization initiator (manufactured by IGM Resins BV, trade name: Omnirad1173)

[0046] (Example 1) <Production of decorative sheets> First, a PVC substrate with a thickness of 250 μm was prepared. Next, the materials shown in Table 1 were blended to prepare the paint of Example 1 having the composition (parts by mass) shown in Table 1. This paint was then applied to the surface of the substrate using a bar coater to form a surface layer coating on the substrate surface.

[0047] Next, using an excimer irradiation device (manufactured by Ushio Inc., product name: 172nm Light Emission Unit, model: SUS1000), Xe was irradiated under a nitrogen atmosphere. 2 The coating was irradiated with excimer light (peak wavelength: 172 nm) using as the discharge gas. The integrated light intensity was 25 mJ / cm². 2 The irradiation intensity is 16 mW / cm². 2 The irradiation was applied in such a manner that it resulted in the following:

[0048] Then, using an ultraviolet irradiation device (a 4kW high-pressure mercury lamp for ultraviolet curing manufactured by I-Graphics Co., Ltd. (H04-L41)), ultraviolet light (dominant wavelength: 365nm) was irradiated onto the coating film to photo-cure the coating film, thereby forming a surface layer on the surface of the substrate and creating a decorative sheet. The ultraviolet irradiation was performed under conditions of an irradiation distance of 15cm and a lamp movement speed of 0.70m / min, with an irradiation dose of 200mJ / cm². 2 That's what I decided.

[0049] Furthermore, Figure 2 shows a laser microscope image illustrating the surface condition of the surface layer. As shown in Figure 2, it can be seen that numerous wrinkles are formed on the surface of the surface layer when excimer light is irradiated onto the coating film that forms the surface layer.

[0050] <Measuring Thickness> Next, the thickness of the surface layer (coating) of the fabricated decorative sheet was measured using a digital microscope (Keyence Corporation, product name: VHX-5000) or a field emission scanning electron microscope (SEM) (Hitachi High-Technologies Corporation, product name: S-4800).

[0051] More specifically, the sheet was cut to expose the cross-section, and 10 locations with high and low coating heights were selected from the cross-section observed using a digital microscope (magnification: 500x) or a field emission scanning electron microscope (magnification: 1000x). The thickness was measured, and the average value was calculated. This measurement was performed three times, and the average of the coating heights from the three measurements was calculated and used as the thickness of the surface layer. The results are shown in Table 1.

[0052] <Heat stretching treatment and evaluation of heat stretchability> Next, the prepared decorative sheets were subjected to heat stretching. More specifically, strip-shaped test pieces measuring 50 mm x 120 mm were prepared, and tensile tests were conducted at stretching temperatures of 80°C and 90°C, under conditions of a tensile speed of 300 mm / min and a chuck distance of 80 mm, stretching to 100% in the long-side direction. Visually, pieces that did not develop cracks perpendicular to the direction of heat stretching at the 80°C stretching temperature were marked with a circle (○), and those that did develop cracks were marked with an "X" (×). The results are shown in Table 1.

[0053] Figure 3 shows a laser microscope image of the surface condition of the surface layer after heat stretching at a stretching temperature of 80°C. As shown in Figure 3, it can be seen that even after heat stretching, no large cracks that affect the appearance are formed.

[0054] <Measurement of glossiness> Next, the 20° gloss, 60° gloss, and 85° gloss of the surface layer of each of the decorative sheets prepared as described above (decorative sheet before stretching (23°C), decorative sheet stretched at 80°C, and decorative sheet stretched at 90°C) were measured using a gloss meter (manufactured by Horiba, Ltd., product name: Gloss Checker IG-320) in accordance with JIS Z 8741:1997. The above measurement was performed five times, and the average value of the gloss from the five measurements was calculated and used as the gloss of the surface layer. The results are shown in Table 1.

[0055] <Calculation of glossiness for stretched areas> Next, the gloss of the stretched portion was calculated based on the gloss values ​​described above. More specifically, the difference between the 60° gloss of the surface layer before stretching (23°C) and the 60° gloss of the surface layer after stretching at a stretching temperature of 80°C was calculated, and the ratio of the 60° gloss of the surface layer after stretching at a stretching temperature of 80°C to the 60° gloss of the surface layer before stretching (23°C) was also calculated. The results are shown in Table 1.

[0056] <Calculation of glossiness based on measurement angle> Next, based on the gloss values ​​described above, the gloss values ​​related to the measurement angle were calculated. More specifically, the value obtained by subtracting the 20° gloss value of the surface layer before stretching (at 23°C) from the 85° gloss value of the surface layer before stretching (at 23°C) was calculated, and the value obtained by subtracting the 20° gloss value of the surface layer after stretching (at 90°C) from the 85° gloss value of the surface layer after stretching was also calculated. The results are shown in Table 1.

[0057] (Examples 2-3) The decorative sheet was prepared in the same manner as in Example 1 described above, except that the composition of the paint components was changed to the composition (parts by mass) shown in Table 1.

[0058] Then, in the same manner as in Example 1 described above, thickness measurement, heat stretching treatment, evaluation of heat stretchability, gloss measurement, calculation of gloss for the stretched area, and calculation of gloss for the measurement angle were performed. The results are shown in Table 1.

[0059] (Comparative Examples 1-4) A decorative sheet was prepared in the same manner as in Example 1 described above, except that RPET with a thickness of 250 μm was used as the base material instead of the PVC mentioned above, and the composition of the paint components was changed to the composition (parts by mass) shown in Table 1.

[0060] Then, in the same manner as in Example 1 described above, thickness measurement, heat stretching treatment, evaluation of heat stretchability, gloss measurement, calculation of gloss for the stretched area, and calculation of gloss for the measurement angle were performed. The results are shown in Table 1.

[0061] [Table 1]

[0062] As shown in Table 1, when stretched at a stretching temperature of 80°C, the difference between the 60° gloss of the surface layer at 23°C before stretching and the 60° gloss of the surface layer after stretching is 1.5 or less, and the ratio of the 60° gloss of the surface layer after stretching to the 60° gloss of the surface layer at 23°C before stretching is 0.8 or less. In the decorative sheets of Examples 1 to 3, the difference in gloss of the surface layer before and after stretching is small, resulting in a low gloss due to the matte effect, and it can be seen that even when heat stretching is performed, the formation of large cracks that affect the appearance can be prevented.

[0063] Furthermore, as shown in Table 1, in the decorative sheets of Examples 1 to 3, where the value obtained by subtracting the 20° gloss of the surface layer before stretching (at 23°C) from the 85° gloss of the surface layer before stretching (at 23°C) is between 0 and 8, and when stretched at a stretching temperature of 90°C, the value obtained by subtracting the 20° gloss of the surface layer after stretching from the 85° gloss of the surface layer is between 0 and 4, the change in gloss of the entire decorative sheet before and after stretching is small, indicating that it has low gloss due to a matte effect, and even when heat stretching is performed, it is possible to prevent the formation of large cracks that affect the appearance. [Industrial applicability]

[0064] As described above, the present invention is suitable for decorative sheets. [Explanation of Symbols]

[0065] 1 Decorative sheet 2 Base material 2a Surface of the substrate 3 Surface layer 3a Surface of the surface layer

Claims

1. Substrate and A surface layer which is an excimer light irradiated material provided on the surface of the substrate and Equipped with, The aforementioned surface layer consists of a cured product of a paint mainly composed of urethane acrylate. The thickness of the surface layer is 5 to 10 μm. The glossiness of the surface layer at 23°C is 1 or less at 20° and the glossiness at 60° is 10 or less. When stretched 100% in the long-side direction under conditions of a stretching temperature of 80°C, a tensile speed of 300 mm / min, and a chuck distance of 80 mm, the difference between the 60° gloss of the surface layer at 23°C before stretching and the 60° gloss of the surface layer after stretching is 1.5 or less, and the ratio of the 60° gloss of the surface layer after stretching to the 60° gloss of the surface layer at 23°C before stretching is 0.8 or less. A decorative sheet characterized by the following features.

2. Substrate and A surface layer which is an excimer light irradiated material provided on the surface of the substrate and Equipped with, The aforementioned surface layer consists of a cured product of a paint mainly composed of urethane acrylate. The thickness of the surface layer is 5 to 10 μm. The glossiness of the surface layer at 23°C is 1 or less at 20° and the glossiness at 60° is 10 or less. The value obtained by subtracting the 20° gloss of the surface layer at 23°C from the 85° gloss of the surface layer at 23°C is between 0 and 8. When stretched 100% in the long-side direction under conditions of a stretching temperature of 90°C, a tensile speed of 300 mm / min, and a chuck distance of 80 mm, the value obtained by subtracting the 20° gloss of the surface layer after stretching from the 85° gloss of the surface layer after stretching is between 0 and 4. A decorative sheet characterized by the following features.

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