JP2023170857A - Decorative sheet - Google Patents

Abstract

To provide a decorative sheet with excellent tactile performance.SOLUTION: A decorative sheet includes a transparent thermoplastic resin layer 6, and a surface protective layer 7 provided on an outermost surface 1a. The outermost surface 1a is provided with an uneven pattern 30. The outermost surface 1a has a maximum height roughness Rz of 3 μm or more and 10 μm or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a decorative sheet.

As a surface decorative board for the interior and exterior of buildings, furniture, fittings, vehicle interiors, etc., for example, a decorative sheet printed with a pattern imitating the cut surface of stone or a woodgrain pattern is pasted onto the object. It is used. Decorative sheets used in such surface decorative boards are required to have excellent scratch resistance so that the surface is hard to be scratched, and stain resistance so that contaminants can be easily wiped off. Furthermore, in recent years, decorative sheets are required to have good touch (tactile performance) (see Patent Document 1).

JP2021-053996A

The present invention was made in view of the above-mentioned problems, and an object of the present invention is to provide a decorative sheet with excellent tactile performance.

In order to solve the above problems, a decorative sheet according to one aspect of the present invention includes a thermoplastic resin layer and a surface protective layer provided on the outermost surface, the outermost surface is provided with an uneven pattern, and the outermost surface is provided with an uneven pattern. The maximum height roughness Rz of the surface is 3 μm or more and 10 μm or less.

According to the present invention, a decorative sheet with excellent tactile performance is provided.

FIG. 1 is a cross-sectional view schematically showing an example of a decorative sheet of the present embodiment.

Hereinafter, one embodiment will be described in detail with reference to the drawings.
Please note that the drawings referred to in the following explanation may show characteristic parts enlarged for convenience in order to emphasize them, and the dimensional ratios of each component may not be the same as in reality. Not exclusively. Furthermore, for the same purpose, non-characteristic parts may be omitted from the illustrations.

(cosmetic parts)
FIG. 1 is a schematic cross-sectional view of the decorative member of this embodiment.
The decorative member 10 of this embodiment includes a plate-shaped base material 11 and a decorative sheet 1 provided on the surface 11a side of the base material 11.

(Base material)
The base material 11 is a target component to which the decorative sheet 1 is attached. As the material of the base material 11, for example, a wood-based material or a metal-based material can be used. As the wood-based material, for example, wood veneer, wood plywood, laminated wood, particle board, medium density fiberboard, and hard fiberboard can be adopted. Further, as the metal material, for example, a steel plate, a brass plate, an aluminum plate, a duralumin plate, or a stainless steel plate can be adopted.

(decorative sheet)
The decorative sheet 1 includes an adhesive layer 2, a primer layer 3, a colored thermoplastic resin layer 4, a pattern layer 5, a transparent thermoplastic resin layer (thermoplastic resin layer) 6, and a surface protection layer 7. . The adhesive layer 2, the primer layer 3, the colored thermoplastic resin layer 4, the pattern layer 5, the transparent thermoplastic resin layer 6, and the surface protection layer 7 are laminated in this order from the base material 11 side to the outermost surface 1a side. ing. The thickness of the decorative sheet 1 is, for example, 40 μm or more and 300 μm or less.

Note that the "outermost surface" of the decorative sheet 1 herein means the surface exposed when the decorative sheet 1 is attached to the base material 11. Among the layers of the decorative sheet 1, the surface protective layer 7 is the layer furthest from the base material 11, so the outermost surface 1a of the decorative sheet 1 is the surface of the surface protective layer 7.

(Adhesive layer)
The adhesive layer 2 is provided for adhesively fixing the decorative sheet 1 to the base material 11. The adhesive layer 2 is located closest to the base material 11 among the multiple layers that make up the decorative sheet 1 . Adhesive layer 2 is formed using an adhesive. The adhesive used for the adhesive layer 2 is appropriately selected depending on the type of the base material 11. For example, when the base material 11 is made of a wood-based material, a vinyl acetate emulsion adhesive, a two-component curable urethane adhesive, or the like is used as the adhesive.

(Primer layer)
The primer layer 3 is provided as necessary to improve the adhesion between the base material 11 and the adhesive layer 2. It is desirable that the primer layer 3 has a resin design depending on the type of adhesive. Examples of the primer layer 3 include those containing a primer resin, such as a urethane resin primer made of an acrylic modified urethane resin, a resin primer made of a block copolymer of acrylic and urethane, or a two-component urethane. Examples include those formed using a resin-based primer agent. The primer layer 3 may further contain a filler such as silica powder.

Although only one primer layer 3 is shown here, the primer layer 3 may be two or more layers. When the primer layer 3 has multiple layers, these multiple layers may have the same composition or different compositions, and the combination of these multiple layers is not particularly limited.

The thickness of the primer layer 3 is not particularly limited, but is preferably 0.01 μm or more and 10 μm or less, more preferably 0.1 μm or more and 3 μm or less. When the thickness of the primer layer 3 is equal to or greater than the lower limit, the fixing strength of the decorative sheet 1 to the object to be fixed becomes higher. By setting the thickness of the primer layer 3 to be less than or equal to the upper limit, it is possible to prevent the thickness of the decorative sheet 1 from becoming excessive, and improve the handling properties of the decorative sheet 1, such as making it easier to bend the decorative sheet 1. may be better.

(Colored thermoplastic resin layer)
The colored thermoplastic resin layer 4 contains thermoplastic resin. The thermoplastic resin contained in the colored thermoplastic resin layer 4 may be a known thermoplastic resin. Examples of the thermoplastic resin contained in the colored thermoplastic resin layer 4 include polyolefins such as polyethylene, polypropylene, polybutene, polymethylpentene, ethylene-propylene copolymer, and ethylene-propylene-butene copolymer; polyvinyl chloride; Examples include ethylene-vinyl acetate copolymer; acrylic resin such as ethylene-acrylic acid copolymer; polyolefin thermoplastic elastomer. The acrylic resin is a resin having structural units derived from (meth)acrylic acid or (meth)acrylic ester, and contains structural units other than (meth)acrylic acid or (meth)acrylic ester. , may or may not have other structural units.

The grade and composition of the thermoplastic resin contained in the colored thermoplastic resin layer 4 are determined by considering, for example, the required environmental compatibility, processability, price, ease of sheeting, printability, bending processability, etc. You can choose as appropriate.

The colored thermoplastic resin layer 4 may contain only one type of thermoplastic resin, or may contain two or more types. If there are two or more types, the combination and ratio thereof may be arbitrarily selected. can.

The thermoplastic resin contained in the colored thermoplastic resin layer 4 is preferably polyolefin. Polyolefin-based thermoplastic resins have high environmental compatibility and processability, and are relatively inexpensive, so that the cost of the decorative sheet 1 can be reduced.

Furthermore, the colored thermoplastic resin layer 4 may contain other components that do not correspond to thermoplastic resins. Components other than the thermoplastic resin contained in the colored thermoplastic resin layer 4 are not particularly limited, and can be arbitrarily selected depending on the purpose. The number of components other than the thermoplastic resin contained in the colored thermoplastic resin layer 4 may be only one, or two or more, and when there are two or more, the combination and ratio thereof are as follows: Can be selected arbitrarily.

Examples of components other than the thermoplastic resin contained in the colored thermoplastic resin layer 4 include colorants, fillers, flame retardants, antioxidants, lubricants, foaming agents, and the like.

The coloring agent contained in the colored thermoplastic resin layer 4 may be a known coloring agent, and may be, for example, either a pigment or a dye. Examples of colorants include inorganic pigments such as titanium white, zinc white, Bengara, vermilion, ultramarine, cobalt blue, titanium yellow, yellow lead, and carbon black; isoindolinone, Hansa Yellow A, quinacridone, permanent red 4R, Examples include organic pigments or organic dyes such as phthalocyanine blue, industhrene blue RS, and aniline black; metal pigments such as aluminum and brass; pearlescent pigments made of foil powder such as titanium dioxide-coated mica and basic lead carbonate. It will be done.

The colored thermoplastic resin layer 4 is colored by containing a colorant. The colored thermoplastic resin layer 4 can hide color variations, defects, etc. on the surface 11a of the base material 11 by being colored. Furthermore, the colored thermoplastic resin layer 4 may be made semi-transparent by adjusting the type and amount of the coloring agent added to take advantage of the texture of the surface 11a of the base material 11.

The filler contained in the colored thermoplastic resin layer 4 may be a known filler, and examples thereof include calcium carbonate, clay, and the like. The flame retardant contained in the colored thermoplastic resin layer 4 may be any known flame retardant, such as magnesium hydroxide.

In the colored thermoplastic resin layer 4, the ratio of the content of the thermoplastic resin to the total mass of the colored thermoplastic resin layer 4 ([amount of thermoplastic resin in the colored thermoplastic resin layer 4 (parts by mass)]/[colored The total mass (parts by mass)]×100) of the thermoplastic resin layer 4 is preferably 90% by mass or more.

Although only one colored thermoplastic resin layer 4 is shown here, it may be two or more layers. When the colored thermoplastic resin layer 4 has multiple layers, these multiple layers may have the same composition or different compositions, and the combination of these multiple layers is not particularly limited.

The thickness of the colored thermoplastic resin layer 4 is not particularly limited, but is preferably 40 μm or more and 150 μm or less, more preferably 50 μm or more and 100 μm or less. When the thickness of the colored thermoplastic resin layer 4 is equal to or greater than the lower limit, the mechanical strength of the decorative sheet 1 becomes higher. By setting the thickness of the colored thermoplastic resin layer 4 to be less than or equal to the upper limit value, it is possible to prevent the thickness of the decorative sheet 1 from becoming excessive, and for example, the decorative sheet 1 can be folded more easily. becomes easier to handle.

(Picture layer)
The pattern layer 5 is located between the colored thermoplastic resin layer 4 and the transparent thermoplastic resin layer 6. The pattern layer 5 is provided with a pattern. The pattern layer 5 is provided as necessary to give the decorative sheet 1 a design based on a pattern. The pattern layer 5 may be omitted if it can be replaced by the coloring of the colored thermoplastic resin layer 4.

The pattern layer 5 is formed using printing ink or paint, etc., in which a colorant is dissolved or dispersed in a suitable diluting solvent together with a suitable binder resin. The printing ink or paint is applied, for example, by various printing methods such as gravure printing or offset printing, or by various coating methods such as gravure coating or roll coating. Further, as the binder resin, for example, urethane resin, acrylic resin, vinyl acetate chloride resin, polyimide resin, nitrified cotton, etc., or a mixture thereof can be used, but it is of course limited to these. isn't it.

Further, any pattern can be used as the pattern, such as wood grain pattern, stone grain pattern, cloth grain pattern, abstract pattern, geometric pattern, letters, symbols, solid color, etc., or a combination of two or more of these types. etc. can be used. In addition, in order to improve the concealing properties of the decorative sheet 1, a concealing layer made of opaque printing ink or paint containing a large amount of opaque pigment such as titanium dioxide or iron oxide is provided between the pattern layer 5 and the colored thermoplastic resin layer 4. may be provided.

The coloring agent contained in the pattern layer 5 may be a known coloring agent, and may be, for example, either a pigment or a dye. Examples of colorants include inorganic pigments such as carbon black, titanium white (titanium oxide), zinc white, iron composite oxide, iron oxide, Bengara, navy blue, and cadmium red; azo pigments, lake pigments, anthraquinone pigments, and quinacridones. Organic pigments such as pigments, phthalocyanine pigments, isoindolinone pigments, and dioxazine pigments; Metal powder pigments such as aluminum powder and bronze powder; Pearlescent pigments such as titanium oxide-coated mica and bismuth chloride oxide; Fluorescent pigments; Luminous pigments; Metallic pigments etc. Iron composite oxide can be used as a thermal barrier pigment. The pattern layer 5 may contain only one type of coloring agent, or may include two or more types of coloring agents, and in the case of two or more types, the combination and ratio thereof can be arbitrarily selected.

Although only one pattern layer 5 is shown here, it may be two or more layers. When the pattern layer 5 has multiple layers, these multiple layers may have the same composition or different compositions, and the combination of these multiple layers is not particularly limited.

The thickness of the pattern layer 5 is not particularly limited, but is preferably 0.1 μm or more and 10 μm or less, more preferably 0.5 μm or more and 5 μm or less. When the thickness of the pattern layer 5 is equal to or greater than the lower limit value, the decorative sheet 1 has a higher design quality. By setting the thickness of the pattern layer 5 to be less than or equal to the upper limit value, the thickness of the decorative sheet 1 can be prevented from becoming excessive, and the handling of the decorative sheet 1 can be improved, for example, the decorative sheet 1 can be more easily folded. becomes good.

Although not shown in the present embodiment, a transparent adhesive layer is provided between the pattern layer 5 and the colored thermoplastic resin layer 4 or between the pattern layer 5 and the transparent thermoplastic resin layer 6. may be provided. The adhesive layer is provided as necessary to bond the colored thermoplastic resin layer 4 and the transparent thermoplastic resin layer 6 together. The adhesive layer can be omitted if the adhesive properties of other layers can be utilized.

When the pattern layer 5 is formed on the surface 4a of the colored thermoplastic resin layer 4, the adhesive layer is provided between the pattern layer 5 and the transparent thermoplastic resin layer 6, and the adhesive layer is provided between the pattern layer 5 and the transparent thermoplastic resin layer 6. Glue 6. Further, when the pattern layer 5 is formed on the back surface 6b of the transparent thermoplastic resin layer 6, the adhesive layer is provided between the pattern layer 5 and the colored thermoplastic resin layer 4, and the adhesive layer is provided between the pattern layer 5 and the colored thermoplastic resin layer. Glue 4.

(Transparent thermoplastic resin layer (thermoplastic resin layer))
The transparent thermoplastic resin layer 6 is transparent. The transparent thermoplastic resin layer 6 adjusts the visual texture of the layers disposed below the transparent thermoplastic resin layer 6 when the decorative sheet 1 is observed from the surface protection layer 7 side. Adjust the appearance.

The transparent thermoplastic resin layer 6 contains thermoplastic resin. The transparent thermoplastic resin layer 6 may be colorless or colored, but is preferably colorless. Examples of the thermoplastic resin contained in the transparent thermoplastic resin layer 6 include the same thermoplastic resins as those contained in the colored thermoplastic resin layer 4 described above.

The grade and composition of the thermoplastic resin contained in the transparent thermoplastic resin layer 6 are determined by considering, for example, the required environmental compatibility, processability, price, ease of sheeting, printability, bending processability, etc. You can choose as appropriate.

The transparent thermoplastic resin layer 6 may contain only one type of thermoplastic resin, or may contain two or more types. If there are two or more types, the combination and ratio thereof can be selected arbitrarily. can.

The thermoplastic resin contained in the transparent thermoplastic resin layer 6 is preferably polyolefin. Polyolefin-based thermoplastic resins have high environmental compatibility and processability, and are relatively inexpensive, so that the cost of the decorative sheet 1 can be reduced.

The transparent thermoplastic resin layer 6 may contain other components that do not correspond to thermoplastic resins. Components other than the thermoplastic resin contained in the transparent thermoplastic resin layer 6 are not particularly limited, and can be arbitrarily selected depending on the purpose. The number of components other than the thermoplastic resin contained in the transparent thermoplastic resin layer 6 may be only one, or two or more, and when there are two or more, the combination and ratio of the components are as follows: Can be selected arbitrarily.

Examples of components other than the thermoplastic resin contained in the transparent thermoplastic resin layer 6 include weathering agents such as ultraviolet absorbers and light stabilizers. The ultraviolet absorber contained in the transparent thermoplastic resin layer 6 may be a known one, and examples thereof include benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, triazine ultraviolet absorbers, and the like. The light stabilizer contained in the transparent thermoplastic resin layer 6 may be a known one, such as a hindered amine light stabilizer.

In the transparent thermoplastic resin layer 6, the ratio of the content of the thermoplastic resin to the total mass of the transparent thermoplastic resin layer 6 ([amount of thermoplastic resin in the transparent thermoplastic resin layer 6 (parts by mass)]/[transparent The total mass (parts by mass)]×100) of the thermoplastic resin layer 6 is preferably 90% by mass or more.

When the decorative sheet 1 is observed from the outermost surface 1a side, the surface 6a of the transparent thermoplastic resin layer 6 may be a glossy surface (hereinafter referred to as a glossy surface) or a non-glossy surface (hereinafter referred to as a glossy surface). , matte surface). Whether the surface 6a is a glossy surface or a matte surface can be adjusted by, for example, the type or content of the components contained in the transparent thermoplastic resin layer 6. Examples of matting agents include inorganic fine particles such as silica, calcium carbonate, synthetic mica, titanium oxide, and glass particles; organic fine particles such as polyethylene fine particles, acrylic resin fine particles, urethane resin fine particles, urea resin fine particles, nylon resin fine particles, and balloons. Can be mentioned.

Although only one transparent thermoplastic resin layer 6 is shown here, it may be two or more layers. When the transparent thermoplastic resin layer 6 has multiple layers, these multiple layers may have the same composition or different compositions, and the combination of these multiple layers is not particularly limited.

The thickness of the transparent thermoplastic resin layer 6 is not particularly limited, but is preferably 30 μm or more and 200 μm or less, more preferably 50 μm or more and 150 μm or less. When the thickness of the transparent thermoplastic resin layer 6 is equal to or greater than the lower limit, the effect of having the transparent thermoplastic resin layer 6 becomes higher. By setting the thickness of the transparent thermoplastic resin layer 6 to be less than or equal to the upper limit value, it is possible to avoid the thickness of the decorative sheet 1 from becoming excessive, and for example, the decorative sheet 1 can be folded more easily. becomes easier to handle.

(Surface protective layer)
The surface protection layer 7 is a layer provided on the outermost surface 1a of the decorative sheet 1. The surface protection layer 7 is provided to protect other layers disposed below it. Further, the surface protective layer 7 constitutes the outermost surface 1a of the decorative sheet 1. The surface protection layer 7 is a layer that comes into contact with a person who touches the decorative sheet 1. The surface protective layer 7 of this embodiment has enhanced tactile performance and is provided to provide a smooth tactile sensation to the person who comes into contact with it. Further, it is preferable that the surface protective layer 7 is provided with scratch resistance that makes it difficult to be scratched, and stain resistance that makes it easy to wipe off dirt.

The surface protection layer 7 of this embodiment is transparent. Therefore, when the decorative sheet 1 is observed from the outside on the surface protection layer 7 side, the layers disposed below the surface protection layer 7 are visible. Note that the surface protective layer 7 may be either colorless or colored, but is preferably colorless.

The thickness of the surface protective layer 7 is not particularly limited, and can be appropriately selected depending on the function to be provided. The thickness of the surface protective layer 7 is, for example, preferably 0.1 μm or more and 50 μm or less, more preferably 0.5 μm or more and 20 μm or less. Furthermore, the thickness of the surface protective layer 7 may be either 1 μm or more and 10 μm or less, and 1 μm or more and 5 μm or less. When the thickness of the surface protective layer 7 is at least the lower limit, the tactile performance, scratch resistance, and stain resistance of the surface protective layer 7 can be improved. When the thickness of the surface protective layer 7 is less than or equal to the upper limit value, the decorative sheet 1 can be more easily folded, and the handling properties of the decorative sheet 1 are improved.

In addition, in this specification, "the thickness of a surface protective layer" means the thickness of the whole surface protective layer. When the surface protective layer is composed of multiple layers (a first layer and a second layer described later), the total thickness of all the layers constituting the surface protective layer is the "thickness of the surface protective layer."

The surface protection layer 7 of this embodiment includes a first layer 7a and a second layer 7b provided on the surface of the first layer 7a. However, the surface protective layer 7 may be composed of a single layer. The first layer 7a is the base layer of the surface protective layer 7. The first layer 7a makes it easier to fix the second layer 7b. Further, the first layer 7a provides scratch resistance to the surface protection layer 7, and the first layer 7a protects each layer below the surface protection layer 7. On the other hand, the second layer 7b constitutes the outermost surface 1a of the decorative sheet 1. The second layer 7b provides the surface protective layer 7 with tactile performance and stain resistance.

Acrylic urethane resin can be used as the material for the first layer 7a. As the acrylic urethane resin, for example, a reaction product containing an acrylic polyol compound as a main ingredient and an isocyanate compound as a curing agent can be used. Examples of acrylic polyol compounds include methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, and methacrylate. Monomers containing hydroxyl groups such as 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and 2-hydroxypropyl acrylate in addition to ordinary acrylic monomers such as 2-ethylhexyl. and, if necessary, a copolymerizable monomer such as styrene, α-methylstyrene, vinyltoluene, divinylbenzene, vinyl acetate, vinyl butyrate, vinyl versatate, ethyl vinyl ether, acrylonitrile, methacrylonitrile, etc. An acrylic polymer compound having a hydroxyl group in its side chain, which is obtained by copolymerizing the acrylic resin, can be used.

Examples of the isocyanate compound include tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate (NDI), xylylene diisocyanate (XDI), hydrogenated diphenylmethane diisocyanate (hydrogenated MDI), and hydrogenated xylylene diisocyanate (hydrogenated XDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), etc. can be used. In particular, when the decorative member 10 is used as an exterior member, the first layer 7a needs to have weather resistance. Cyclic isocyanate compounds are preferred.

Furthermore, an ionizing radiation curing resin may be used as the material for the first layer 7a. The ionizing radiation-curable resin has, for example, as a main component at least one of a prepolymer, an oligomer, and a monomer having a polymerizable unsaturated bond such as a (meth)acryloyl group that has the property of undergoing a crosslinking reaction when irradiated with ionizing radiation. compositions can be used. As the ionizing radiation, for example, an electron beam or ultraviolet light can be used. For example, additives such as a polymerization initiator and a sensitizer may be added to the ionizing radiation-curable resin, if necessary.

Examples of prepolymers and oligomers having polymerizable unsaturated bonds include melamine (meth)acrylate, epoxy (meth)acrylate, urethane (meth)acrylate, polyester (meth)acrylate, polyether (meth)acrylate, and polyol (meth)acrylate. ) Acrylate etc. can be used. Examples of monomers include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, cyclohexyl (meth)acrylate, ethylhexyl (meth)acrylate, hydroxyethyl (meth)acrylate, and glycidyl (meth)acrylate. monofunctional monomers such as ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, polyethylene glycol diacrylate, propylene glycol diacrylate, butanediol diacrylate, hexanediol diacrylate, trimethylolpropane Polyfunctional monomers such as triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, etc. can be used.

In addition, in this specification, "ionizing radiation" means electromagnetic waves or charged particle beams having energy capable of curing ionizing radiation-curable resin, and specific examples thereof include ultraviolet rays, electron beams, visible light, Examples include X-rays and ion beams.

In this embodiment, the thickness of the first layer 7a is preferably 1.0 μm or more and 15.0 μm or less, and 2 More preferably, the thickness is .5 μm or more and 6.5 μm or less.

As the material for the second layer 7b, for example, silicone-modified acrylic urethane resin can be used. Silicone-modified acrylic urethane resin is a resin obtained by adding an isocyanate compound to an acrylic polyol compound and a reactive silicone oil and curing the resin. By using silicone-modified acrylic urethane resin, stain resistance can be improved and a matte design can be achieved. As the reactive silicone oil, for example, one obtained by introducing a primary hydroxyl group into the terminal alkyl group of a polysiloxane resin can be employed.

The thickness of the second layer 7b is preferably 1.0 μm or more and 5.0 μm or less, more preferably 1.5 μm or more and 3.5 μm or less, in order to appropriately improve the tactile performance and stain resistance performance of the surface protective layer 7. .

(uneven pattern)
The outermost surface 1a of the decorative sheet 1 is provided with a plurality of recesses 20 formed by embossing. The recess 20 of this embodiment has a groove shape in cross section. A plurality of recesses 20 are provided on the outermost surface 1a. In this embodiment, the planar shape of the recess 20 is linear when the outermost surface 1a is viewed from above.

The depth D of the recess 20 is preferably 10 μm or more and 500 μm or less. By setting the depth D within such a range and further appropriately selecting the surface protective layer 7 provided on the outermost surface 1a, the maximum height roughness Rz, arithmetic mean roughness Ra, and water contact angle can be within the ranges described below. Further, it is preferable that the width W of the opening of the recess 20 is appropriately determined based on ease of processing and the like.

Examples of the planar shape of the groove-like recesses 20 of the surface protection layer 7 include linear shapes, curved shapes, and linear shapes having both straight portions and curved portions. Note that the planar shape of the recess 20 may be other than a linear shape.

The recesses 20 on the outermost surface 1a of the decorative sheet 1 can be formed by embossing. The recesses 20 are formed by pressing an embossing plate onto the surface 6a of the transparent thermoplastic resin layer 6 to form the base recesses 21 on the surface 6a, and then forming and curing a coating film of the surface protective layer 7 along the base recesses 21. can. Note that the embossing process for forming the recesses 20 can also be performed after providing the surface protective layer 7 on the outermost surface 1a. In this case, the recesses 20 are formed by heating and softening the surface protection layer 7 and then pressing a letterpress against the outermost surface 1a. Since the depth D of the recess 20 in this embodiment is sufficiently larger than the thickness of the surface protection layer 7, the base recess 21 is simultaneously formed on the surface 6a of the transparent thermoplastic resin layer 6.

The plurality of recesses 20 constitute an uneven pattern 30 on the outermost surface 1a of the decorative sheet 1. That is, the uneven pattern 30 is provided on the outermost surface 1a of the decorative sheet 1. By providing the uneven pattern 30 on the outermost surface 1a, a person who touches the outermost surface 1a is less likely to feel that his or her hand sticks to the outermost surface 1a, and a smooth tactile sensation can be imparted to the outermost surface 1a.

As the uneven pattern 30, for example, a pattern that is synchronized with the pattern of the pattern layer 5 or a pattern that is not synchronized can be used. Furthermore, when the recesses 20 on the outermost surface 1a are not groove-like (non-grooved), the patterns on the outermost surface 1a include, for example, wood grain conduit grooves, stone surface irregularities (granite cleavage surface, etc.), cloth surface texture. A. Satin finish, sand grain, hairline, lined grooves, etc. are included. The recesses 20 on the outermost surface 1a may be a combination of non-groove and groove-like recesses.

The maximum height roughness Rz of the outermost surface 1a of the decorative sheet 1 is preferably 3 μm or more and 10 μm or less. According to the present embodiment, the outermost surface 1a is provided with moderate unevenness with a maximum height roughness Rz of 3 μm or more, so that the hands of the person who comes into contact with the outermost surface 1a do not stick to the outermost surface 1a. can give a smooth touch. In addition, by setting the maximum height roughness Rz of the outermost surface 1a to 10 μm or less, when a contact person touches the outermost surface 1a, the feeling of roughness from the outermost surface is suppressed, and a smooth tactile sensation is provided to the contact person. can be given.

The arithmetic mean roughness Ra of the outermost surface 1a of the decorative sheet 1 is preferably 0.2 μm or more and 1.5 μm or less. By setting the arithmetic mean roughness Ra of the outermost surface 1a to 0.2 μm or more and 1.5 μm or less, a smooth tactile sensation can be provided to those who come into contact with it. In order to give the outermost surface 1a a smoother touch, the arithmetic mean roughness Ra of the outermost surface 1a is more preferably 0.2 μm or more and 1.0 μm or less.

In this specification, "arithmetic mean roughness Ra" and "maximum height roughness Rz" mean those measured in accordance with JIS B0601:2013 (ISO4287:1997).

The water contact angle of the outermost surface 1a of the decorative sheet 1 is preferably 95° or more and 130° or less. By setting the water contact angle of the outermost surface 1a to 95° or more, the wettability of the outermost surface 1a can be appropriately suppressed. Therefore, moisture on the surface of the contacting person's hand can be prevented from becoming too familiar with the outermost surface 1a, and the contacting person's hand can be provided with a smooth tactile sensation without sticking to the outermost surface 1a. Similarly, by setting the water contact angle of the outermost surface 1a to 130° or less, it is possible to impart appropriate wettability to the outermost surface 1a and provide a smooth tactile sensation to the hands of those who come into contact with it.
Note that the water contact angle can be measured, for example, by using a contact angle meter (portable contact angle meter PG-3 manufactured by Fibro System AB).

(summary)
As explained above, the decorative sheet 1 of this embodiment includes a thermoplastic resin layer (transparent thermoplastic resin layer 6 in this embodiment) and a surface protection layer 7 provided on the outermost surface 1a. An uneven pattern 30 is provided on the outermost surface 1a. The maximum height roughness Rz of the outermost surface 1a is 3 μm or more and 10 μm or less. According to this embodiment, a person who touches the outermost surface 1a of the decorative sheet 1 can be given a smooth tactile sensation. Furthermore, the unevenness formed on the outermost surface 1a allows a matte texture to be expressed.

According to this embodiment, the water contact angle of the outermost surface 1a of the decorative sheet 1 is preferably 95° or more and 130° or less. According to this embodiment, the hand of the person making the contact does not completely stick to the outermost surface 1a, and can provide a smooth tactile sensation.

According to this embodiment, it is preferable that the arithmetic mean roughness Ra of the outermost surface 1a is 0.2 μm or more and 1.5 μm or less. According to this embodiment, a person who touches the outermost surface 1a of the decorative sheet 1 can be given a smooth tactile sensation. Note that the arithmetic mean roughness Ra is more preferably 0.2 μm or more and 1.0 μm or less.

According to this embodiment, the colored thermoplastic resin layer 4 located on the back side of the thermoplastic resin layer (transparent thermoplastic resin layer 6 in this embodiment) and the colored thermoplastic resin layer 4 and the thermoplastic resin layer and a pattern layer 5 located in between. The thermoplastic resin layer has transparency. The pattern layer 5 has a pattern. According to this embodiment, by providing the colored thermoplastic resin layer 4, the surface 11a of the base material 11 can be hidden by the colored thermoplastic resin layer 4. Furthermore, by arranging the pattern layer 5 and the transparent thermoplastic resin layer 6 on top of the colored thermoplastic resin layer 4, the pattern layer 5 and the colored thermoplastic resin layer 4 are different from the transparent thermoplastic resin layer 6 when viewed from the outermost surface 1a. A decorative sheet 1 with a three-dimensional design placed at the back can be realized.

Examples that embody the above-described embodiment will be described below. However, the present invention is not limited to the examples shown below.

<Preparation of sample>
(Example 1)
The decorative sheet of Example 1 has the same configuration as the above-described embodiment. The decorative sheet of Example 1 was produced using the following materials and procedures. That is, a 100 μm thick polypropylene sheet (manufactured by Okura Industries) is used as the colored thermoplastic resin layer, and a picture pattern layer is formed on the surface of the colored thermoplastic resin layer by gravure printing using urethane ink (urethane ink manufactured by Toyo Ink). did. Further, a transparent thermoplastic resin layer of polypropylene resin (manufactured by Prime Polymer Co., Ltd.) was formed on this picture pattern layer using an extruder to a thickness of 70 μm. Further, at the same time as extruding the transparent thermoplastic resin layer, base recesses were formed on the surface of the transparent thermoplastic resin layer using an embossing plate having an arithmetic mean roughness Ra of 1 μm or less. Next, a thermosetting resin (acrylic urethane resin manufactured by DIC) was applied as the first layer of the surface protective layer in an amount of 4.0 g/m ² to 5.0 g/m ² . Further, on top of the first layer, a thermosetting resin (silicone-modified acrylic urethane resin manufactured by Toyo Ink Co., Ltd.) is applied as a second layer at a coating amount of 2.5 g/m ² to 3.5 g/m ² . The first layer and the second layer were cured at .degree. As a result, a decorative sheet was produced in which recesses derived from the base recesses were formed on the outermost surface.

(Example 2)
The decorative sheet of Example 2 was produced using the same materials and procedures as in Example 1 except for the following points. That is, the makeup of Example 2 was made by the same process as Example 1, except that the base recesses were formed on the surface of the transparent thermoplastic resin layer using an embossing plate with an arithmetic mean roughness of 1.5 μm or less. A sheet was produced.

(Example 3)
The decorative sheet of Example 3 was produced using the same materials and procedures as in Example 1 except for the following points. That is, except that a polyethylene sheet with a thickness of 100 μm (manufactured by RIKEN TECHNOS Co., Ltd.) was used as the colored thermoplastic resin layer, and the uneven portions were formed using an embossing plate with an arithmetic mean roughness of 0.5 μm or less. A decorative sheet of Example 3 was produced by the same process as in Example 1.

(Example 4)
The decorative sheet of Example 3 was produced using the same materials and procedures as in Example 1 except for the following points. That is, a 100 μm thick polyethylene sheet (manufactured by Riken Technos) was used as the colored thermoplastic resin layer, and an extruder was used to form the polypropylene clear layer to a thickness of 80 μm. The uneven portion was formed using the following method. Furthermore, as a surface protective layer, a thermosetting resin (acrylic urethane resin manufactured by DIC) is applied at a coating amount of 2.5 to 3.5 g/m2, and on top of that, a thermosetting resin (DIC) is applied at a coating amount of 2.5 to 3.5 g/ ^m2 . A decorative sheet was obtained by applying the powder at a concentration of .5 to 3.5 g/m ² . The pattern layer was formed in the same manner as in Example 1.

(Comparative example 1)
A decorative sheet of Comparative Example 1 was produced using the same materials and procedures as in Example 1 except for the following points. That is, a 100 μm thick polyethylene sheet (manufactured by RIKEN TECHNOS Co., Ltd.) was used as the colored thermoplastic resin layer, and an extruder was used to form the polypropylene clear layer to a thickness of 90 μm. The uneven portions were formed using an embossing plate. Further, the pattern layer and the surface protective layer were formed in the same manner as in Example 1 to obtain a decorative sheet.

(Comparative example 2)
A decorative sheet of Comparative Example 2 was produced using the same materials and procedures as in Example 1 except for the following points. That is, a 100 μm thick polyethylene sheet (manufactured by RIKEN TECHNOS Co., Ltd.) is used as the colored thermoplastic resin layer, and an extruder is used to form the polypropylene clear layer to a thickness of 70 μm, and at the same time, the arithmetic mean roughness is 1 μm to 2 μm. The uneven portions were formed using an embossing plate as shown below. A surface protective layer was formed thereon in the same manner as in Example 1 to obtain a decorative sheet. Note that the picture pattern layer was formed in the same process as in Example 1.

(Comparative example 3)
A decorative sheet of Comparative Example 3 was produced using the same materials and procedures as in Example 1 except for the following points. That is, a picture pattern layer was formed in the same manner as in Example 1 using a 100 μm thick polyolefin sheet as the colored thermoplastic resin layer. A decorative sheet was obtained by dry laminating a 75 μm thick PET sheet (manufactured by Mitsubishi Chemical) on which a hard coat agent was applied on the picture pattern layer.

<Evaluation method and evaluation criteria>
Next, the decorative sheets of each sample of Examples and Comparative Examples produced through the above steps were evaluated by the following method. The evaluation results are summarized in Table 1 below.

(1) Sensory evaluation Ten arbitrarily selected examiners were allowed to touch the outermost surface of the decorative sheet to perform a sensory evaluation. Evaluation criteria were determined as follows according to the number of examiners who answered that the outermost surface of the target decorative sheet was "smooth."
A+: 9 to 10 people A: 7 to 8 people A-: 5 to 6 people B: 1 to 4 people C: 0 people

(2) Water contact angle The water contact angle was measured on the outermost surface of the decorative sheet using a portable contact angle meter "PG-3" manufactured by Fibro System AB, using a method calculated from the width and height of the water droplet. .

(3) Maximum height roughness Rz of uneven parts
Using a laser microscope "LEXT OLS4100" manufactured by Olympus Corporation, the outermost surface of the decorative sheet was imaged, a roughness curve of 644 μm in the imaging range was extracted, and the maximum height roughness Rz was calculated from the contour curve.

(4) Arithmetic mean roughness Ra of uneven parts
Using a laser microscope "LEXT OLS4100" manufactured by Olympus Corporation, the outermost surface of the decorative sheet was imaged, a roughness curve of 644 μm in the imaging range was extracted, and the arithmetic mean roughness Ra was calculated from the contour curve of the area.

As is clear from the above results, the decorative sheets of Examples 1 to 4 in which the maximum height roughness Rz of the outermost surface is within the range of 3 μm or more and 10 μm or less, the majority of examiners found the sheets smooth from the sensory evaluation results. I'm getting a sense of touch. Among these, Examples 1 to 3, in which the water contact angle of the outermost surface was within the range of 95° or more and 130° or less, were confirmed by many testers to provide a smooth feel. Furthermore, it was confirmed that Examples 1 to 3, in which the arithmetic mean roughness Ra of the outermost surface was within the range of 0.2 μm or more and 1.5 μm or less, gave a smooth tactile sensation to many testers. .

The present invention can be used as a building material.

DESCRIPTION OF SYMBOLS 1... Decorative sheet, 1a... Outer surface, 4... Colored thermoplastic resin layer, 5... Pattern layer, 6... Transparent thermoplastic resin layer (thermoplastic resin layer), 6b... Back surface, 7... Surface protective layer, 30... Irregularities pattern

Claims (4)

a thermoplastic resin layer;
A surface protective layer provided on the outermost surface,
The outermost surface is provided with an uneven pattern,
The maximum height roughness Rz of the outermost surface is 3 μm or more and 10 μm or less,
Cosmetic sheet. The water contact angle of the outermost surface is 95° or more and 130° or less,
The decorative sheet according to claim 1. The arithmetic mean roughness Ra of the outermost surface is 0.2 μm or more and 1.5 μm or less,
The decorative sheet according to claim 1. a colored thermoplastic resin layer located on the back side of the thermoplastic resin layer;
a pattern layer located between the colored thermoplastic resin layer and the thermoplastic resin layer,
The thermoplastic resin layer has transparency,
The pattern layer has a pattern,
The decorative sheet according to any one of claims 1 to 3.

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