JP2023046950A - decorative material - Google Patents

Abstract

To provide a decorative material having good touch feeling.SOLUTION: A decorative material includes a first surface and a second surface opposite to the first surface. The first surface has an average static friction coefficient of 1.200 or less and a standard deviation σ of the static friction coefficient of 0.180 or more.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to cosmetic materials.

Decorative materials are used, for example, to decorate interior and exterior materials such as furniture, fittings, and walls. The surface of the decorative material may be roughened for the purpose of adjusting the design or imparting a tactile sensation.

Means for making the surface of the decorative material uneven include means for embossing with an embossing roll, means for forming a mat layer on the surface of the decorative material, and the like. Patent Literature 1 discloses a decorative material whose surface is embossed in order to impart a tactile sensation.

JP 2019-217740 A

The cosmetic material of Patent Document 1 can impart a predetermined tactile feel. However, the decorative material of Patent Literature 1 cannot provide a tactile feel close to that of natural materials such as wood grain and stone grain. Therefore, in the decorative material of Patent Document 1, when the design of the decorative material is made of a natural material, the tactile feel cannot be balanced with the appearance, and the tactile feel cannot be said to be good. rice field.

An object of the present disclosure is to provide a decorative material with a good tactile feel.

In order to solve the above problems, the present disclosure provides the following [1].
[1] A cosmetic material,
The decorative material has a first surface and a second surface opposite to the first surface,
The decorative material, wherein the first surface has an average static friction coefficient of 1.200 or less and a static friction coefficient standard deviation σ of 0.180 or more.

The decorative material of the present disclosure can have a good tactile feel.

1 is a cross-sectional view showing one embodiment of a cosmetic material of the present disclosure; FIG. FIG. 4 is a cross-sectional view showing another embodiment of the decorative material of the present disclosure; It is a figure for demonstrating the method of calculating the direction, depth, width, and length of a groove|channel.

[Cosmetic materials]
The cosmetic material of the present disclosure is
Having a first surface and a second surface opposite to the first surface,
The first surface has an average static friction coefficient of 1.200 or less and a static friction coefficient standard deviation σ of 0.180 or more.

1 and 2 are cross-sectional views showing an embodiment of the cosmetic material 100 of the present disclosure.
1 and 2 has a first surface S1 and a second surface S2 opposite to the first surface.
The decorative material 100 of FIG. 1 has a base material layer 10, and one surface of the base material layer 10 forms the first surface S1. The decorative material 100 of FIG. 2 has a substrate layer 10, a primer layer 30 and a surface protective layer 40, and the surface of the surface protective layer opposite to the substrate layer forms a first surface S1. 1 and 2, the first face of the facing material has a plurality of grooves 50. As shown in FIG.
1 and 2, the substrate layer 10 has a transparent resin layer 11, an adhesive layer 12, a decoration layer 13 and a substrate 14 in this order.

1 and 2 are schematic diagrams for facilitating explanation of the cosmetic material of the present disclosure. That is, the upholstery of the present disclosure is not limited to the shape and scale of FIGS. 1 and 2. FIG.

<Friction coefficient>
The decorative material of the present disclosure is required to have an average static friction coefficient of 1.200 or less on the first surface. If the average static friction coefficient exceeds 1.200, the tactile sensation is too strong, which is not preferable.
When the average static friction coefficient of the first surface is 1.200 or less, it is possible to easily obtain an appropriate tactile sensation. However, even if the average static friction coefficient is 1.200 or less, there are cases where the tactile sensation cannot be improved. As a result of intensive studies, the present inventor has found that the average static friction coefficient of the first surface is 1.200 or less and the standard deviation σ of the static friction coefficient of the first surface is 0.180 or more, so that the tactile sensation is good. I found what I can do. The reason why the tactile sensation can be improved by setting the standard deviation σ of the coefficient of static friction to 0.180 or more is thought to be that the tactile sensation approaches that of a natural object. On the other hand, even if the average static friction coefficient is 1.200 or less, if the standard deviation σ of the static friction coefficient is less than 0.180, the tactile sensation tends to be like an artificial object, making it difficult to obtain a good tactile sensation.

If the average static friction coefficient of the first surface is too small, the tactile sensation may be reduced because the tactile sensation may be slippery. Therefore, the average static friction coefficient is preferably 0.300 or more and 1.200 or less, more preferably 0.400 or more and 1.000 or less, and 0.500 or more and 0.850 or less. More preferred.

If the standard deviation σ of the coefficient of static friction of the first surface is too large, it will be difficult to obtain the tactile sensation of a natural object. Therefore, the standard deviation σ of the coefficient of static friction is preferably 0.180 or more and 0.300 or less, more preferably 0.190 or more and 0.290 or less, and 0.200 or more and 0.280 or less. is more preferred.

In this specification, the average static friction coefficient and the standard deviation σ of the static friction coefficient are calculated from static friction coefficients measured at arbitrary 20 points on the decorative material. At 20 measurement points, the static friction coefficient was measured in random directions.

The static friction coefficient can be measured, for example, by using a portable tribometer (trade name “3D Muse TYPE: 37i”) manufactured by Shinto Kagaku Co., Ltd., and attaching nitrile rubber to the measurement surface side of the slider of the tribometer. The reason why nitrile rubber is attached to the slider is to bring it closer to the friction of a human finger. The slider of the tribometer is an aluminum cylinder with a bottom diameter of 26 mm and hard chromium treated.

In order to keep the average static friction coefficient and the standard deviation σ of the static friction coefficient within the above ranges, the ratio of the grooves on the first surface, etc. must be set within a predetermined range, or the content of the matting agent in the layer constituting the first surface. and so on within a predetermined range. Specific adjustment methods for the average static friction coefficient and the standard deviation σ of the static friction coefficient will be described later.

<Layer structure>
The decorative material of the present disclosure may have a single-layer structure, or may have a multi-layer structure in which a plurality of layers are laminated. Examples of the layer structure of the decorative material include the following (A1) to (A6). In (A1) to (A6) below, "/" indicates an interface between layers. In the following (A1) to (A6), it is preferable that the layer located on the left side forms the first surface.
(A1) single layer of base layer (A2) surface protective layer/base layer (A3) surface protective layer/primer layer/base layer (A4) base layer/back primer layer (A5) surface protective layer/base Material layer/back primer layer (A6) surface protective layer/primer layer/base layer/back primer layer

<Groove>
Preferably, the first surface of the decorative material has a plurality of grooves.
As the contact area between the first surface and the contact object increases, the static friction coefficient tends to increase. Conversely, when the contact area between the first surface and the contacting object decreases, the static friction coefficient tends to decrease. For this reason, the first surface of the decorative material has a plurality of grooves, and by reducing the flat portion of the first surface, the average static friction coefficient can be easily set within the above range.

The ratio of the area in which the grooves are formed to the total area of the first surface of the decorative material is preferably 50% or more and 95% or less, more preferably 60% or more and 90% or less, and 70% or more. It is more preferably 80% or less. By setting the area ratio of the grooves within the above range, the average static friction coefficient and the standard deviation σ of the static friction coefficient can be easily set within the above range.

Examples of means for forming grooves on the first surface of the decorative material include shaping with an embossing roll. It is preferable to form relatively large grooves on the first surface in the shaping by the embossing roll. Forming by an embossing roll can be carried out, for example, as described in (x1) and (x2) below.
(x1) After completing a single-layered or multi-layered decorative material, embossing is performed on the first surface of the decorative material.
(x2) The surface of the substrate layer is embossed to form grooves on the surface of the substrate layer. Thereafter, a surface protective layer or the like is formed on the embossed surface of the base material layer to obtain a multilayer decorative material. Grooves reflecting the grooves of the base material layer are formed on the first surface of the multilayer decorative material.

The temperature and pressure when forming the shape with the embossing plate may be appropriately adjusted according to the material of the layers constituting the decorative material. For example, if the substrate of the substrate layer and the transparent resin layer are polyolefin, the temperature is 140° C. or higher and 180° C. or lower and 10 kg/cm ² or higher and 50 kg/cm ² or lower.
A representative method of shaping with an embossing plate is, for example, as follows.
First, an embossing plate is pressed against the surface of the softened base material layer to form a pattern on the surface of the embossing plate. Then, the pattern formed on the base material layer is fixed by solidifying the base material layer by cooling or the like. After that, the pattern-formed substrate layer is released from the embossing plate.

As described above, by reducing the flat portion of the first surface (≈increasing the number of grooves on the first surface), the average static friction coefficient can be easily set within the above range.
For this reason, when forming grooves on the first surface with an embossing plate, the surface of the embossing roll increases the area ratio of the region for forming grooves on the first surface, and the area for forming flat portions on the first surface. It is preferable to reduce the area ratio.

In order to increase the standard deviation σ of the coefficient of static friction, it is preferable to randomly set at least one or more of the conditions of the grooves to different values for each groove. Groove conditions include the ratio of grooves, width of grooves, depth of grooves, length of grooves, direction of grooves, and the like. The preferred range of groove ratio is as described above. Preferred ranges for the groove depth, groove length, and groove direction will be described later. The number of conditions for the grooves to have randomness may be one, or two or more.

Regarding the depth of the groove, even if the depth is the same, the coefficient of static friction tends to show different values depending on the gradation of the embossed plate. The recesses of the embossing plate are formed by corrosion by etching or engraving by laser light. Further, the recess is usually formed in multiple steps (the recess is formed stepwise) instead of in one step. The steps described above are called gradations. Even if the depth of the grooves formed by the embossing plate is the same, the static friction coefficient tends to show different values if the number of gradations of the embossing plate or the standard deviation σ of the gradations is different. Therefore, using an embossed plate with a large number of gradations or an embossed plate with a large standard deviation σ of the gradations increases the range of possible static friction coefficients, making it easier to increase the standard deviation σ of the static friction coefficients.
An embossed plate with a large number of gradations or an embossed plate with a large standard deviation σ of gradations can be produced, for example, by engraving a metal roll with a laser beam. A technique for engraving a metal roll with laser light is described, for example, in International Publication No. WO2020/203737.

The shape of the groove in plan view is not particularly limited, and various patterns can be used.
When the design represented by the entire decorative material is a wood pattern, the plan view shape of the groove preferably forms one or more patterns selected from cracks, conduits, autumn wood, and knots of roasted cedar. "Cracks in burnt cedar" refer to cracks that form perpendicular to the direction of grain when the surface of a cedar board is scorched to form a carbon layer.
When the design expressed by the entire decorative material is a pattern of stones such as travertine, it is preferable that the shape of the groove in plan view is a concave portion.

The width of each groove is not particularly limited, but is preferably 10 μm or more and 2000 μm or less, more preferably 50 μm or more and 1800 μm or less, and further preferably 100 μm or more and 1600 μm or less. The standard deviation σ of the groove width is preferably 20 μm or more and 600 μm or less, more preferably 40 μm or more and 500 μm or less, and even more preferably 60 μm or more and 400 μm or less.
Although the depth of each groove is not limited, it is preferably 10 μm or more and 100 μm or less, more preferably 15 μm or more and 95 μm or less, and even more preferably 20 μm or more and 90 μm or less. The standard deviation σ of the groove depth is preferably 1 μm or more and 20 μm or less, more preferably 2 μm or more and 18 μm or less, and even more preferably 3 μm or more and 16 μm or less.
Regarding the individual grooves, the groove length is not limited, but is preferably 5 mm or more, more preferably 10 mm or more, and even more preferably 15 mm or more. The length of the groove may be the length that extends from one end of the facing material to the other end. The standard deviation σ of the groove length is preferably 5 mm or more, more preferably 10 mm or more, and even more preferably 15 mm or more.

When the predetermined direction is 0 degree, it is preferable that the direction of each groove is randomly selected from the range of 0 degrees or more and 179 degrees or less. It should be noted that the standard deviation σ of the static friction coefficient can be increased by imparting randomness to other conditions such as the width even if the direction of the groove is not imparted with randomness. Therefore, when the predetermined direction is 0 degrees, the direction of each groove may be biased at a specific angle, or may be randomly selected within an angle range narrower than 0 degrees or more and 179 degrees or less. good.

_D1 , which is the direction in which the individual grooves extend, means the average direction of the directions in which the individual grooves extend. Also, the direction in which each groove extends means the direction in which the distance between any two points in each groove is maximized. For example, in the case of the groove in FIG. 3, the direction connecting points A and B is the direction _D1 in which the groove extends.
The length of each groove means the maximum distance between any two points in each groove. For the groove of FIG. 3, the distance between points A and B is the length of the groove.

The depth of each groove can be calculated, for example, in steps B1 and B2 below.
B1: For each groove, height data across the groove are measured at 5 randomly selected points to obtain 5 profile curves with height data. When the planar shape of the groove is an elongated shape extending in an arbitrary direction, height data is measured in a direction orthogonal to _D1 , which is the direction in which the groove extends. For example, when the planar view shape is the groove shown in FIG. 3, the height data is measured at five points a to e in the dotted line direction perpendicular to the extending direction _D1 of the groove.
B2: From the height data measured in B1, the maximum depth of each measurement point is extracted, and the average value of the five maximum depths is taken as the average depth of each groove.

The width of each groove can be calculated, for example, by C1 below.
C1: From the five cross-sectional curves measured in B1 above, the width of the groove at each measurement point is calculated. Then, the average value of the widths at five locations is taken as the width of each groove.

<<Base material layer>>
The decorative material preferably has a base material layer.
The substrate layer may have a single-layer structure, or may have a multilayer structure in which a plurality of layers are laminated. Examples of the layer structure of the substrate layer include the following (D1) to (D10). In (D1) to (D10) below, "/" indicates an interface between layers. In the substrate layers (D1) to (D10) below, it is preferable to arrange the layer described on the left side facing the surface protective layer. For example, the substrate layer (D8) below is preferably used as a multi-layer substrate layer having a transparent resin layer, an adhesive layer, a decorative layer and a substrate in this order from the surface protective layer side.
(D1) Single layer of base material (D2) Decorative layer/base material (D3) Base material/decorating layer (D4) Transparent resin layer/base material (D5) Transparent resin layer/decorating layer/base material (D6) Transparent resin layer/substrate/decorative layer (D7) Transparent resin layer/adhesive layer/substrate (D8) Transparent resin layer/adhesive layer/decorative layer/substrate (D9) Transparent resin layer/decoration Layer/adhesive layer/substrate (D10) transparent resin layer/adhesive layer/substrate/decorative layer

-Base material-
The material of the base material is not particularly limited, but a plastic film or a composite of a plastic film and paper is preferred because grooves can be easily formed by embossing or the like.

Specific examples of resins constituting plastic films include polyolefin resins such as polyethylene and polypropylene, vinyl chloride resins, vinylidene chloride resins, polyvinyl alcohol, vinyl resins such as ethylene-vinyl alcohol copolymers, polyethylene terephthalate, and polybutylene. Examples include polyester resins such as terephthalate, acrylic resins such as polymethyl methacrylate, polymethyl acrylate and polyethyl methacrylate, polystyrene, acrylonitrile-butadiene-styrene copolymer (ABS resin), cellulose triacetate, and polycarbonate. Among these, polyolefin-based resins, vinyl chloride resins, polyester resins, and acrylic resins, which are excellent in printability and molding processability, are preferred.

The substrate may be a transparent substrate or a colored substrate. Also, the substrate may be a laminated substrate obtained by laminating a plurality of substrates. In addition, when the layer structure of the base material layer is the above (D6) or (D10), it is preferable to use a transparent base material as the base material in order to visually recognize the decorative layer through the base material.

The thickness of the substrate is not particularly limited, but is preferably 20 μm or more and 200 μm or less, more preferably 40 μm or more and 160 μm or less, and even more preferably 40 μm or more and 100 μm or less.

In order to improve the adhesion with the layer provided on the substrate, one side or both sides of the substrate may be subjected to adhesion promoting treatment such as physical treatment or chemical surface treatment.

―Decoration layer―
The base layer may have a decorative layer in order to improve the design of the decorative material.
The decorative layer may be, for example, a colored layer covering the entire surface (so-called solid colored layer), a pattern layer having various patterns, or a combination thereof.

The pattern imparted by the decorative layer is not particularly limited, but examples thereof include wood patterns and stone patterns. By forming these patterns on the decorative layer, it is possible to easily impart a realistic tactile sensation.

The decoration layer can be formed, for example, by applying and drying a decoration layer ink containing a coloring agent such as a pigment and a dye and a binder resin. Additives such as an extender pigment, an antioxidant, a plasticizer, a catalyst, a curing agent, an ultraviolet absorber and a light stabilizer can be mixed with the ink for the decorative layer, if necessary.

Colorants include inorganic pigments such as carbon black (ink), iron black, titanium white, antimony white, yellow lead, titanium yellow, red iron oxide, cadmium red, ultramarine, cobalt blue, quinacridone red, isoindolinone yellow, and phthalocyanine. Examples include organic pigments such as blue, and dyes.
The content of the colorant is preferably 1 part by mass or more and 90 parts by mass or less, more preferably 2 parts by mass or more and 50 parts by mass or less, relative to 100 parts by mass of the binder resin.

Binder resins include acrylic resins, styrene resins, polyester resins, urethane resins, chlorinated polyolefin resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral, alkyd resins, petroleum resins, ketone resins, epoxy resins, melamine resins, Fluororesins, silicone resins, rubber-based resins, and the like are included.

The thickness of the decoration layer is preferably 0.1 μm or more and 20 μm or less, more preferably 0.5 μm or more and 10 μm or less, and even more preferably 1.0 μm or more and 5.0 μm or less.

―Transparent resin layer―
The substrate layer may have a transparent resin layer to increase strength.
Examples of resins constituting the transparent resin layer include polyolefin resins, polyester resins, polycarbonate resins, acrylonitrile-butadiene-styrene copolymers (ABS resins), acrylic resins, and vinyl chloride resins. from the viewpoint of polyolefin resin is preferable. The transparent resin layer may be a mixture of these exemplified resins, or may be a laminate of layers composed of one or more of these exemplified resins.

Polyolefin resins for the transparent resin layer include polyethylene (low density, medium density, high density), polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, propylene-butene copolymer, ethylene-vinyl acetate copolymer. polymers, ethylene-acrylic acid copolymers, ethylene-propylene-butene copolymers, and the like. Among these, polyethylene (low density, medium density, high density), polypropylene, ethylene-propylene copolymer and propylene-butene copolymer are preferred, and polypropylene is more preferred.

The transparent resin layer may contain additives such as ultraviolet absorbers, light stabilizers and colorants. When the transparent resin layer contains an ultraviolet absorber, the ultraviolet absorber is preferably a triazine-based compound, more preferably a hydroxyphenyltriazine-based compound.

The thickness of the transparent resin layer is preferably 20 μm or more and 150 μm or less, more preferably 40 μm or more and 120 μm or less, and even more preferably 60 μm or more and 100 μm or less, from the viewpoint of the balance between scratch resistance, workability and weather resistance.

- Adhesive layer -
The substrate layer may have an adhesive layer to improve interlayer adhesion.
The adhesive layer can be composed of, for example, a general-purpose adhesive such as a urethane-based adhesive, an acrylic adhesive, an epoxy-based adhesive, or a rubber-based adhesive. Among these adhesives, urethane-based adhesives are preferable in terms of adhesive strength.
Urethane-based adhesives include, for example, adhesives using two-liquid curing urethane resins containing various polyol compounds such as polyether polyols, polyester polyols and acrylic polyols, and curing agents such as isocyanate compounds.

The thickness of the adhesive layer is preferably 0.1 μm or more and 30 μm or less, more preferably 1 μm or more and 15 μm or less, and even more preferably 2 μm or more and 10 μm or less.

<<Surface protective layer>>
The decorative material preferably has a surface protective layer on the base material layer.
Furthermore, it is more preferable that the decorative material has a surface protective layer on the substrate layer, and that the surface of the surface protective layer opposite to the substrate layer is the first surface.
In order to improve the scratch resistance of the decorative material, the surface protective layer preferably contains a cured product of a curable resin composition as a resin component.

The curable resin composition includes a thermosetting resin composition containing a thermosetting resin, an ionizing radiation-curable resin composition containing an ionizing radiation-curable resin, and mixtures thereof. Among them, an ionizing radiation-curable resin composition is preferred because it increases the crosslink density of the surface protective layer and improves surface properties such as scratch resistance. Furthermore, since the ionizing radiation-curable resin composition cures instantly, it is preferable in that the shape of the grooves formed in the substrate layer can easily be reflected on the surface of the surface protective layer. Among the ionizing radiation-curable resin compositions, the electron beam-curable resin composition is more preferable because it can be applied without a solvent and is easy to handle.

A thermosetting resin composition is a composition containing at least a thermosetting resin, and is a resin composition that is cured by heating. Thermosetting resins include acrylic resins, urethane resins, phenol resins, urea melamine resins, epoxy resins, unsaturated polyester resins, silicone resins, and the like. If necessary, a curing agent is added to these curable resins in the thermosetting resin composition.

The ionizing radiation-curable resin composition is a composition containing a compound having an ionizing radiation-curable functional group (hereinafter also referred to as an "ionizing radiation-curable compound"). The ionizing radiation-curable functional group is a group that is cross-linked and cured by irradiation with ionizing radiation, and preferably includes a functional group having an ethylenic double bond such as (meth)acryloyl group, vinyl group, and allyl group. In addition, in this specification, a (meth)acryloyl group shows an acryloyl group or a methacryloyl group. Moreover, in this specification, (meth)acrylate indicates acrylate or methacrylate.
In addition, ionizing radiation means, among electromagnetic waves or charged particle beams, those having energy quanta capable of polymerizing or cross-linking molecules, usually ultraviolet rays (UV) or electron beams (EB) are used. Electromagnetic waves such as X-rays and γ-rays, and charged particle beams such as α-rays and ion beams are also included.
Specifically, the ionizing radiation-curable compound can be appropriately selected and used from polymerizable monomers and polymerizable oligomers conventionally used as ionizing radiation-curable resins.

As the polymerizable monomer, a (meth)acrylate monomer having a radically polymerizable unsaturated group in the molecule is preferable, and a polyfunctional (meth)acrylate monomer is particularly preferable. Here, "(meth)acrylate" means "acrylate or methacrylate".
Polyfunctional (meth)acrylate monomers include (meth)acrylate monomers having two or more ionizing radiation-curable functional groups in the molecule and at least a (meth)acryloyl group as the functional group.

Polymerizable oligomers include, for example, (meth)acrylate oligomers having two or more ionizing radiation-curable functional groups in the molecule and at least (meth)acryloyl groups as the functional groups. Examples thereof include urethane (meth)acrylate oligomers, epoxy (meth)acrylate oligomers, polyester (meth)acrylate oligomers, polyether (meth)acrylate oligomers, polycarbonate (meth)acrylate oligomers, and acrylic (meth)acrylate oligomers.
Furthermore, as polymerizable oligomers, there are also highly hydrophobic polybutadiene (meth)acrylate oligomers having (meth)acrylate groups in the side chains of polybutadiene oligomers, and silicone (meth)acrylate oligomers having polysiloxane bonds in the main chain. , Aminoplast resin modified aminoplast resin with many reactive groups in a small molecule (meth)acrylate oligomer, or novolak type epoxy resin, bisphenol type epoxy resin, aliphatic vinyl ether, aromatic vinyl ether, etc. There are oligomers having cationic polymerizable functional groups.

These polymerizable oligomers may be used alone or in combination. Urethane (meth)acrylate oligomers, epoxy (meth)acrylate oligomers, polyester (meth)acrylate oligomers, polyether (meth)acrylate oligomers, and polycarbonate (meth)acrylates from the viewpoint of improving processability, scratch resistance, and weather resistance. At least one selected from oligomers and acrylic (meth)acrylate oligomers is preferable, at least one selected from urethane (meth)acrylate oligomers and polycarbonate (meth)acrylate oligomers is more preferable, and urethane (meth)acrylate oligomers are even more preferable. .

A monofunctional (meth)acrylate may be used in combination with the ionizing radiation-curable resin composition for the purpose of reducing the viscosity of the ionizing radiation-curable resin composition. These monofunctional (meth)acrylates may be used alone or in combination.

When the ionizing radiation-curable compound is an ultraviolet-curable compound, the ionizing radiation-curable resin composition preferably contains additives such as a photopolymerization initiator and a photopolymerization accelerator.
Examples of the photopolymerization initiator include one or more selected from acetophenone, benzophenone, α-hydroxyalkylphenone, Michler's ketone, benzoin, benzyldimethylketal, benzoylbenzoate, α-acyloxime ester, thioxanthones, and the like.
In addition, the photopolymerization accelerator can reduce polymerization inhibition by air during curing and increase the curing speed. One or more selected types can be mentioned.

The surface protective layer preferably contains a matting agent.
By forming the surface protective layer containing a matting agent on the first surface, the contact area between the first surface and the contacting object is reduced, and the average static friction coefficient can be easily set within the above range.

Matting agents include inorganic particles such as silica, calcium carbonate, titanium oxide and barium sulfate; organic particles such as acrylic beads and styrene beads. Among these, inorganic particles are preferred. Inorganic particles tend to agglomerate relatively easily. In addition, the size of aggregates of inorganic particles tends to be random. Therefore, by using inorganic particles, the standard deviation σ of the static friction coefficient can be easily set within the above range.

The average particle size of the matting agent is preferably 0.5 μm or more and 20 μm or less, more preferably 1 μm or more and 10 μm or less. The average static friction coefficient tends to decrease as the average particle size of the matting agent increases. In the present specification, the average particle size means the mass average value d50 in particle size distribution measurement by laser light diffraction method.

The content of the matting agent is preferably 1 part by mass or more and 30 parts by mass or less, more preferably 2 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the binder resin. The average static friction coefficient tends to decrease as the content of the matting agent increases.
Note that when the matting agent aggregates, the standard deviation σ of the static friction coefficient tends to increase. For this reason, when the content of the matting agent that easily aggregates is increased, the average static friction coefficient decreases, but the standard deviation σ of the static friction coefficient may increase.

The surface protective layer may contain additives such as ultraviolet absorbers, light stabilizers and colorants, if necessary.

The thickness of the surface protective layer is preferably 1.5 μm or more and 20 μm or less, more preferably 2 μm or more and 15 μm or less, and even more preferably 3 μm or more and 10 μm or less, from the viewpoint of the balance between scratch resistance and weather resistance.
By setting the thickness to 1.5 μm or more, the scratch resistance can be easily improved. By setting the thickness to 20 μm or less, the workability can be easily improved. Further, by setting the thickness to 20 μm or less, the shape of the grooves formed in the substrate layer can be easily reflected on the surface of the surface protective layer.

<Primer layer>
A primer layer may be provided between the substrate layer and the surface protective layer to improve adhesion.
The primer layer is mainly composed of a binder resin. The primer layer may contain additives such as ultraviolet absorbers and light stabilizers.

Binder resins for the primer layer include urethane resins, acrylic polyol resins, acrylic resins, ester resins, amide resins, butyral resins, styrene resins, urethane-acrylic copolymers, and polycarbonate-based urethane-acrylic copolymers ( Polyurethane-acrylic copolymer derived from a polymer having a carbonate bond and two or more hydroxyl groups at the terminal and side chain (polycarbonate polyol), vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate- Resins such as acrylic copolymer resins, chlorinated propylene resins, nitrocellulose resins (nitrocellulose), and cellulose acetate resins are preferred, and these can be used alone or in combination. Further, the binder resin may be one obtained by adding a curing agent such as an isocyanate curing agent or an epoxy curing agent to these resins and curing by crosslinking. Among these, a polyol resin such as an acrylic polyol resin that is crosslinked and cured with an isocyanate curing agent is preferable, and an acrylic polyol resin that is crosslinked and cured with an isocyanate curing agent is more preferable.

The thickness of the primer layer is preferably 0.5 μm or more and 10 μm or less, more preferably 0.7 μm or more and 8 μm or less, and even more preferably 1 μm or more and 6 μm or less.

<Back primer layer>
The decorative material of the present disclosure may use a back primer layer as a layer forming the second surface in order to improve the adhesiveness between the decorative material and various adherends.
Materials used for forming the back primer layer are not particularly limited, and include urethane resins, acrylic resins, polyester resins, vinyl chloride/vinyl acetate copolymers, chlorinated polypropylene resins, chlorinated polyethylene resins, and the like.
The thickness of the back primer layer is preferably 0.5 μm or more and 5.0 μm or less, more preferably 1 μm or more and 3 μm or less.

The surface protective layer, the decorative layer, the primer layer, the adhesive layer and the back primer layer are coated with an ink containing a composition forming each layer by gravure printing, bar coating, roll coating, reverse roll coating, comma coating. It can be formed by coating with a known method such as the above, and drying and curing as necessary.
The transparent resin layer can be formed by hot melt extrusion, for example.

<Application of decorative material>
The decorative material of the present disclosure can be used for various purposes as it is or as a laminate laminated to an adherend.
Various uses include interior materials for buildings such as walls, ceilings, and floors; fittings such as window frames, doors, and handrails; furniture; housings for home appliances, OA equipment, and the like; be done.
Examples of the adherend include wood board; gypsum board; cement board; fiber cement board; ceramic board; iron plate, metal plate;

EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited by these examples. "Parts" are based on mass unless otherwise specified.

1. Evaluation 1-1. Static Friction Coefficient Static friction coefficients were measured at 20 arbitrary points on the first surface of the decorative materials obtained in Examples and Comparative Examples and the decorative materials of Reference Examples. At 20 measurement points, the static friction coefficient was measured in random directions.
A portable tribometer (trade name “3D Muse TYPE: 37i”) manufactured by Shinto Kagaku Co., Ltd. was used as a measuring device for the coefficient of static friction. The slider of the tribometer is an aluminum cylinder with a bottom diameter of 26 mm and hard chromium treated. During the measurement, nitrile rubber was attached to the measuring surface side of the slider of the tribometer via a double-sided tape ("Thick double-sided tape NO.507" manufactured by Nitto Denko Co., Ltd.). As the nitrile rubber, AS ONE CLEAN NOL nitrile gloves of AS ONE Co., Ltd., which were cut slightly larger than the slider, were used. The nitrile rubber was attached so as to cover the entire measuring surface of the slider. In addition, when the nitrile rubber is attached, it is prevented from loosening.
Based on the values of the static friction coefficients at 20 points, the average of the static friction coefficients and the standard deviation σ of the static friction coefficients were calculated. Table 1 shows the results.

1-2. Tactile Feel The tactile feel of the first surface of the decorative materials obtained in Examples and Comparative Examples and the decorative material of Reference Example was evaluated. Twenty random adults were evaluated according to the following criteria. Table 1 shows the results.
AA: More than 18 people answered that they had the feel of natural wood.
A: 15 to 17 people answered that they had the feel of natural wood.
B: 11 to 14 people answered that they had the feel of natural wood.
C: Less than 10 people answered that they had the feel of natural wood.

2. Preparation of Embossed Plates Embossed plates 1-5 were prepared.
Embossed plates 1 and 2 were produced by corroding and etching an iron roll having a surface plated with a copper layer and then plating the surface with hard chromium. Embossed plates 3 to 5 were produced by engraving an iron roll plated with a copper layer on the surface with a laser beam and then plating the surface with hard chrome.
For each embossed plate, "Range of uneven depth and its standard deviation σ", "Average gradation of unevenness depth and its standard deviation σ", "Range of unevenness direction (width direction of embossed plate) Table 1 shows the range of the direction in which the unevenness extends), and the range of the length of the unevenness and its standard deviation σ.
"Average of gradation of unevenness depth and its standard deviation σ" was calculated in the following steps (1) and (2).
(1) Obtain image data with 256 levels of gradation from 0 to 255 from the minimum value of the depth of unevenness of each embossing plate to the maximum value of the depth of unevenness.
(2) The average gradation of each pixel is defined as the average gradation of the depth of the unevenness of each embossing plate. The standard deviation σ of the gradation for each pixel is defined as the standard deviation σ of the gradation depth of the unevenness of each embossed plate.

3. Production of decorative material [Example 1]
On a colored base material (white polypropylene film with a thickness of 60 μm), a pattern layer with a vessel groove pattern with black ink and a pattern layer with a wood texture pattern other than the vessel part with dark brown ink are formed by multicolor gravure printing. Then, a decorative layer with a wood pattern having a total thickness of 1 μm was formed.
Next, an adhesive layer (polyester resin, thickness: 5 μm) was formed on the decorative layer. Next, a transparent resin layer (transparent polypropylene resin sheet, thickness: 80 μm) is laminated on the adhesive layer by an extrusion lamination method to have a colored substrate, a decorative layer, an adhesive layer and a transparent resin layer in this order. A substrate layer was obtained.
Next, the transparent resin layer is heated to a softened state, and embossed from the transparent resin layer side surface using the embossing plate 3 prepared in "2" above to form an uneven shape on the transparent resin layer side surface. formed.
Further, the transparent resin layer side surface was subjected to corona discharge treatment, and then the following primer layer composition was applied onto the transparent resin layer and dried to form a primer layer having a thickness of 4 μm.
<Composition for primer layer>
100 parts by mass of composition X (a composition obtained by mixing a composition comprising a polycarbonate-based urethane-acrylic copolymer and acrylic polyol and hexamethylene diisocyanate at a mass ratio of 100:5) and a diluent solvent. A composition consisting of

Then, the following surface protective layer composition was applied onto the primer layer and irradiated with an electron beam to crosslink and cure the surface protective layer composition to form a surface protective layer having a thickness of 5 μm. 1 was obtained.

<Composition for Surface Protective Layer>
- Ionizing radiation curable resin composition 100 parts (trifunctional urethane acrylate oligomer with a weight average molecular weight of 4000)
・Matting agent 15 parts (silica with an average particle size of 6 μm)

[Examples 2-3]
The decorative materials of Examples 2 and 3 were prepared in the same manner as in Example 1, except that the type of embossed plate and the content of the matting agent in the surface protective layer composition were changed to the information shown in Table 1. Obtained.

[Comparative Examples 1 to 3]
Decorative materials of Comparative Examples 1 to 3 were prepared in the same manner as in Example 1, except that the type of embossed plate and the content of the matting agent in the surface protective layer composition were changed to the information shown in Table 1. Obtained.

[Reference Examples 1 and 2]
Natural wood boards were prepared as the decorative materials of Reference Examples 1 and 2.

As shown in Table 1, it can be confirmed that the decorative materials of Examples can improve the tactile sensation.

10: Base material layer 11: Transparent resin layer 12: Adhesive layer 13: Decorative layer 14: Colored base material 30: Primer layer 40: Surface protective layer 50: Groove 100: Decorative material S1: First surface S2: Second surface surface

Claims (7)

Cosmetic material
The decorative material has a first surface and a second surface opposite to the first surface,
The decorative material, wherein the first surface has an average static friction coefficient of 1.200 or less and a static friction coefficient standard deviation σ of 0.180 or more. 2. The decorative material according to claim 1, wherein the average static friction coefficient is 0.300 or more and 1.200 or less, and the static friction coefficient standard deviation σ is 0.180 or more and 0.300 or less. 3. The facing material according to claim 1 or 2, wherein the first surface has a plurality of grooves. 4. The decorative material according to any one of claims 1 to 3, wherein a surface protective layer is provided on a base layer, and the surface of said surface protective layer opposite to said base layer is said first surface. The decorative material according to claim 4, wherein the surface protective layer contains a matting agent. The decorative material according to claim 4 or 5, comprising a primer layer between the base layer and the surface protective layer. The substrate layer according to any one of claims 4 to 6, wherein the substrate layer is a multilayer substrate layer having a transparent resin layer, an adhesive layer, a decorative layer and a substrate in this order from the surface protective layer side. cosmetic material.

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