JP7230406B2 - Decorative materials, shaped sheets - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative material, and more particularly to a decorative material that makes fingerprints inconspicuous (has anti-fingerprint properties).

Decorative materials are widely used as surface decoration materials for furniture, building materials, and the like. For example, Japanese Unexamined Patent Application Publication No. 2002-100002 discloses a technique related to a decorative material made of melamine resin. Decorative materials made of melamine resin have advantages such as excellent heat resistance, scratch resistance, and stain resistance, and are characterized by good productivity.

JP-A-58-197053

However, these decorative materials made of melamine resin have a problem that fingerprint marks are conspicuous when touched with a hand, and fingerprint resistance is low. In particular, this tendency is conspicuous in a decorative material having a so-called matte surface, which is formed by forming fine irregularities such as pear-skin or sand grain on the surface.

Although it is possible to make the traces of fingerprints inconspicuous (improve fingerprint resistance) by changing the material of the decorative material to a resin other than melamine resin, productivity decreases with any material. etc.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a decorative material having anti-fingerprint properties, in which traces of fingerprints are inconspicuous regardless of the type of material. Also provided is a shaping sheet for producing this decorative material.

One aspect of the present invention is a decorative material having an uneven surface, the decorative material having a base material and a concave-convex shape part having a plurality of convex filaments and concave parts arranged on the surface of the base material; A filament is a filament having both ends in a plan view, and a concave portion is a decorative material arranged between adjacent protruding filaments.

The recess may be configured with a portion of a spherical surface.

The substrate and the concave-convex portion may be configured to contain melamine resin.

Another aspect of the present invention is a shaped sheet for producing a decorative material, which includes a substrate, and a plurality of concave filaments and convex portions arranged on the surface of the substrate, and the concave filaments are flat. The shaped sheet is a filament having both ends when viewed, and a convex portion is arranged between a plurality of concave filaments.

According to the present invention, it is possible to provide a decorative material in which traces of fingerprints are inconspicuous regardless of the material used.

FIG. 1 is a plan view showing an enlarged part of the surface of the decorative material 10. FIG. FIG. 2 is a perspective view schematically showing a part of the decorative material 10 for explaining the surface of the decorative material 10. As shown in FIG. FIG. 3 is a plan view schematically showing a part of the decorative material 10 for explaining the surface of the decorative material 10. As shown in FIG. FIG. 4 is a cross-sectional view of part of the decorative material 10. As shown in FIG. FIG. 5 is a diagram for explaining the plate 20. As shown in FIG. FIG. 6 is a perspective view schematically showing a part of the shaped sheet 10' for explaining the surface of the shaped sheet 10'. FIG. 7 is a schematic perspective view for explaining a modification of the shaped sheet 10'. FIG. 8 is a plan view showing an enlarged part of the surface of the decorative material of the comparative example.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the embodiments shown in the drawings. However, the present invention is not limited to these forms. Note that in the drawings shown below, the sizes and ratios of members may be changed or exaggerated for clarity. In addition, for the sake of visibility, parts that are not required for explanation and repetitive symbols may be omitted.

FIG. 1 is a plan view (plan view) of a part of the decorative material 10 according to one embodiment, which is enlarged and viewed from the side of the concave-convex shaped portion 12 . However, the present invention is not limited only to this form.
For convenience, FIG. 1 also shows arrows (x, y, z) representing directions, that is, a coordinate system. Here, the xy direction is the in-plane direction of the surface of the decorative material 10, and the z-direction is the thickness direction and also the normal direction of the xy plane representing the spread of the decorative material in the in-plane direction. Therefore, FIG. 1 is a view of the decorative material 10 viewed from the z-direction, which is the concave-convex shape portion 12 side. It should be noted that, as shown in FIG. 1, a plan view of the decorative material observed from the thickness direction (z direction) of the decorative material is also referred to as a plan view.
As can be seen from FIG. 1, in the decorative material 10 of this embodiment, the substrate 11 has a substantially rectangular parallelepiped flat plate shape, and the surface side of the substrate 11 that can be touched by human eyes and hands (xy Concavo-convex portions 12 are formed on the surface on the +z direction side of the pair of surfaces parallel to the plane, that is, the surface on the upper side in FIG. In the embodiment shown in FIG. 1, the surface of the substrate 11 opposite to the concave-convex shaped portion 12 is a smooth flat surface.
Although illustration is omitted, the surface of the base material 11 opposite to the concave-convex shaped portion 12 has an anchoring effect (reinforcing effect of adhesive force) for the adhesive, so that it may be a rough surface composed of fine irregularities or a wall surface. It is also possible to form grooves, convex protuberances, mounting brackets, etc. as auxiliary means for construction on the construction surface such as.

FIG. 2 is a perspective view schematically showing a part of FIG. 1 extracted and enlarged. As can be seen from FIGS. 1 and 2, the decorative material 10 includes a substrate 11 and an uneven portion 12 formed on one surface of the substrate 11 . FIG. 3 is a plan view schematically showing an enlarged part of FIG. 1. FIG. 4 is a cross-sectional view along IV-IV in FIG.

Each configuration will be described in more detail below.

The base material 11 is a sheet-like member that serves as a base for the concave-convex shaped portion 12 and has a function of imparting strength to the decorative material 10 . The material of the base material 11 is not particularly limited as long as it has the same functions as conventionally known decorative materials. For example, the material of the base material includes polyolefin resins such as polyethylene, polypropylene, olefin thermoplastic elastomers, and ionomers, acrylic resins such as polymethyl methacrylate and polybutyl methacrylate, and thermoplastic polyester resins such as polyethylene terephthalate and polybutylene terephthalate. , thermoplastic urethane resin, vinyl chloride resin, ABS resin (acrylonitrile-butadiene-styrene copolymer), thermosetting resin such as styrene resin, melamine resin, unsaturated polyester resin, two-component curable urethane resin, etc. A resin, or an ionizing radiation-curable resin such as a radical polymerization type acrylate type or a cationic polymerization type epoxy type that is cured by ionizing radiation (ultraviolet rays, electron beams, etc.) can be used. In addition, when the material of the base material is a resin, it may be colored with a known coloring agent.
In addition, paper, non-woven fabric, metal, wood, etc. can also be used in the form of sheets, plates, three-dimensional objects, etc., and can also be used by appropriately laminating them with the above resin materials.
In this manner, the decorative material 10 can improve fingerprint resistance regardless of the material used.

Among them, a so-called melamine resin decorative material made by impregnating paper with an uncured liquid composition of melamine resin, which has been conventionally used from the viewpoint of heat resistance, scratch resistance, and productivity, and then curing the composition. A substrate consisting of can be preferably used. The layer structure of a general melamine resin decorative material consists of the following layer structure and manufacturing method. About 2 to 5 sheets of core paper made by impregnating kraft paper with a basis weight of 50 g/m ² or more and 250 g/m ² or less with an uncured composition of phenolic resin are stacked, and the surface side (exposed during use) Titanium paper impregnated with an uncured composition of melamine resin and having a basis weight of 50 g/m ² or more and 250 g/m ² or less (paper mixed with titanium dioxide particles as a white concealing pigment) is layered on the visible side). Further, an overlay paper made of α-cellulose pulp paper having a basis weight of about 15 g/m ² or more and 50 g/m ² or less impregnated with an uncured composition of melamine resin is overlaid on the surface side. Then, the laminate is heated and pressurized to cure each uncured composition and to obtain a laminated body in which each layer is bonded and integrated.

As for the layer structure of the melamine resin decorative material, it is also possible to omit some of the layers of the above-described laminated structure according to the required performance, price, application, and the like. Alternatively, a configuration in which various layers are additionally laminated in addition to the above-described laminated configuration may be employed.
As an additional layer, titanium paper impregnated with melamine resin (also called balance paper) is used to offset the warp of the melamine resin decorative material laminated with different materials. It can be laminated on the opposite side. In addition, in order to improve the concealability of the melamine resin decorative material, melamine resin-impregnated titanium paper (also called barrier paper) can be laminated between the decorative paper and the overlay paper in the laminated structure.
A representative example of the layer structure of the melamine resin decorative material is as follows.
(1) Core paper (appropriate number of layers)/melamine resin-impregnated decorative paper/overlay paper (laminated structure described above)
(2) Melamine resin-impregnated balance paper/core paper (appropriate number of layers)/melamine resin-impregnated decorative paper/overlay paper (3) Core paper (appropriate number of layers)/melamine resin-impregnated decorative paper/melamine resin-impregnated barrier Paper/overlay paper (4) Melamine resin impregnated balance paper/core paper (as appropriate number of layers)/melamine resin impregnated decorative paper/melamine resin impregnated barrier paper/overlay paper (5) Overlay paper only (as appropriate number of layers)
(6) Only melamine resin-impregnated decorative paper (appropriate number of layers)
(7) Melamine resin impregnated decorative paper/overlay paper

The laminate as described above is a melamine resin decorative material. According to the decorative material 10 in which the concave-convex shape part 12 is formed on the surface side of the base material 11 of such a structure of the melamine resin decorative material, it is possible to improve the anti-fingerprint property even if the melamine resin is used as the material.

The thickness of the substrate is not particularly limited, but in the case of a sheet-like substrate or film-like substrate, the thickness is, for example, about 20 μm or more and 1000 μm or less, and in the case of a plate-like substrate, the thickness is, for example, 1 mm or more and 20 mm or less. A certain amount can be used.

The concave-convex portion 12 is formed on one surface of the base material 11 and imparts anti-fingerprint properties to the surface of the decorative material 10 . In this embodiment, the concave-convex portion 12 has the following form.

As can be seen from FIGS. 1 to 4, in the plan view of the decorative material 10, the uneven shape portion 12 is provided with a plurality of protruding filaments 13, and recesses 14 are arranged between adjacent protruding filaments 13. It is configured. The projections 13 and the recesses 14 provide the decorative material 10 with anti-fingerprint function.

In addition, by arranging such convex filaments 13 and concave portions 14 on the surface, the incident light is diffusely reflected, so that a so-called matte surface can be obtained. Among conventional decorative materials having matte surface irregularities such as pear-skin and grain, those using melamine resin in particular have a matte surface where fingerprint marks are visually conspicuous and the fingerprint resistance is low. was the problem. On the other hand, according to the decorative material 10 of the present embodiment, even if the surface is matte, the anti-fingerprint property can be improved by the concave-convex shape portion 12 . The matte evaluation can be performed by measuring the gloss of the decorative material using a gloss meter (60 degrees, measuring instrument BYK Gardner, Microgloss).

Furthermore, such raised filaments 13 and recessed portions 14 can increase the degree of blackness compared to conventional matte surface irregularities. Here, the quantitative evaluation of blackness can be evaluated by the L value in the L ^* a ^* b ^* color space.

The shape and arrangement of the ridges 13 and the recesses 14 provided in the rugged portion 12 may be configured to have anti-fingerprint properties. That is, these are intended to improve fingerprint resistance.
Here, fingerprint resistance means how conspicuous fingerprint traces are, and fingerprint resistance makes fingerprint traces inconspicuous. As a specific index of fingerprint resistance, color difference ΔE is used for evaluation. If ΔE is 1.5 or less, there is fingerprint resistance. 0.2 or less can be evaluated as having high fingerprint resistance.
Here, the color difference ΔE means “color difference ΔE ^* _ab in the L ^* a ^* b ^* color space”, and the fingerprint resistance index represented by the color difference ΔE is obtained by producing a decorative material using melamine resin, After one drop of oleic acid is dropped on the surface, the anti-fingerprint property is represented by the color difference ΔE (ΔE ^* _ab ) between the surface after 10 reciprocating dry wipes with a rag and the surface before dropping. Therefore, the color in the L ^* a ^* b ^* color space of the surface before dripping oleic acid and the color in the L ^* a ^* b ^* color space of the surface after dripping oleic acid and dry-wiping as described above. The distance is ΔE(ΔE ^* _ab ). Such a color difference can be measured by Konica Minolta Co., Ltd., spectrophotometer CM-370, or the like.

As can be seen from FIGS. 1 to 4, the form of the protruding filaments 13 and the recesses 14 due to such anti-fingerprint properties is such that a plurality of protruding filaments 13 having both ends in a plan view are arranged in the xy plane, The concave portions 14 are arranged so as to be distributed between adjacent convex filaments 13 .

As can be seen from FIGS. 1 to 4, the protruding filament 13 is a linear protruding portion having both ends in a plan view. Although there is no particular limitation as long as it is such a convex portion, for example, the following forms can also be taken.
It is preferable that the ridges 13 have different widths (sizes in the direction orthogonal to the extending direction) in the extending direction. That is, it is preferable that the width of the protruding filament 13 is not constant, and that it becomes thicker and thinner.
Further, it is preferable that the protruding filaments 13 do not extend in a constant direction and are not linear. That is, when a line connecting the points of the protruding filaments 13 in the width direction is taken as the center line, it is preferable that the center line extends not as a single straight line but as a broken line or a curved line.
In addition, it is preferable that adjacent protruding filaments 13 are arranged in different directions so that the center lines are not parallel to each other.

The cross-sectional shape of the protruding filaments 13 is not particularly limited, and may be semicircular, square, elliptical, other polygonal, indefinite, combinations thereof, or the like.

On the other hand, recess 14 is preferably a recessed recess that does not extend significantly in either direction. That is, it is a depression having a part of a spherical surface (for example, a hemispherical surface), a cubic surface, a rectangular parallelepiped surface, or the like.

Further, from the viewpoint of further improving fingerprint resistance, it is more preferable that the projections and the recesses have the following forms.

The width of the protruding filaments 13 is preferably 0.1 μm or more and 250 μm or less, more preferably 0.1 μm or more and 150 μm or less.
The width of the ridges 13 can be measured by observing with an optical microscope.

The height difference between the projection filament 13 and the bottom of the recess 14 is preferably 0.1 μm or more and 100 μm or less, more preferably 1 μm or more and 50 μm or less.
The height difference between the convex filament 13 and the bottom of the recessed portion 14 is determined by using a microtome to prepare a cross section, performing Pt sputtering treatment (E-1045, manufactured by Hitachi High-Technologies Corporation), and observing it with an electron microscope (S-4800 TYPE2, Hitachi High-Technologies Corporation). (manufactured by High Technologies, Inc.).

The diameter of the concave portion 14 is preferably 0.1 μm or more and 100 μm or less, more preferably 0.1 μm or more and 70 μm or less. Here, the "diameter of the recess" is the diameter of the circumscribed circle of the recess in plan view.
In addition, regarding the area ratio of the protruding filament 13 and the recessed portion 14, the area of the protruding filament 13 in plan view is preferably 1% or more and 50% or less, more preferably 3%, compared to the area of the recessed portion. 40% or less.

The diameter of these concave portions 14 and the area ratio of the convex filaments 13 and the concave portions 14 are determined by observing the uneven shape portion 12 using a digital microscope (VHX-6000, manufactured by Keyence Corporation), and using the brightness of the captured image as a threshold. , ridges, and recesses.

According to the decorative material 10 described above, fingerprint resistance can be improved regardless of the material used for the decorative material. For example, even when configured as a so-called melamine resin decorative material using melamine resin as a material, the anti-fingerprint property is excellent.

In addition, according to the concave-convex shape portion 12 as described above, the surface of the decorative material can be provided with a matte feature. In that case, even if the surface is matte, the anti-fingerprint property is compatible. Furthermore, the degree of blackness can be higher than that of the prior art.

Applications of the decorative materials described above are not particularly limited, but examples include interior materials for buildings such as walls, floors, and ceilings; exterior materials for exterior walls, roofs, gates, fences, and fences; Fittings such as frames and door frames, surface materials for fixtures such as rims, baseboards and handrails, surface materials for housings of home electric appliances such as TV receivers and refrigerators, surface materials for furniture such as desks, dining tables and chests of drawers , surface materials for containers such as boxes and resin bottles, interior or exterior materials for vehicles, interior or exterior materials for ships, and the like.

Next, the manufacturing method S10, which is an example of the manufacturing method of the decorative material, will be described. However, the method of manufacturing the decorative material is not limited to this.
The decorative material manufacturing method S10 of this example includes a pattern creating step S11, a plate creating step S12, a shaped sheet creating step S13, and a shaping step S14. Each step will be described below.

<Pattern creation step S11>
In the pattern creation step S11, an uneven shape to be expressed in the uneven shape portion 12 is formed to create pattern data, which is stored as digital data in a storage device.
The pattern data to be created in this step is planar image data in which the planar view shape created using computer graphics software has shading like the photograph in FIG. A set of points (X, Y) satisfying ≤ X ≤ b and c ≤ Y ≤ d, where a, b, c, and d are determined to correspond to the metal roll surface described later. , Y) are associated with image density values D(X, Y) as shown in FIG.

<Plate making step S12>
In the plate making step S12, the pattern data (shading image data) obtained in the pattern creating step S11 is used to form the unevenness (height) formed on the uneven portion 12 of the decorative material in the same plan view shape, and , a plate (molding mold for shaping sheet) having the same unevenness on the surface is produced. Specifically, the unevenness manufacturing process includes the following steps (1) to (5).

(1) Gradient Image Data Creation Process Digital grayscale image data corresponding to the plan view pattern of the convex filaments 13 and the recessed portions 14 forming the concave-convex shape portion 12 is created. The grayscale image data is data in which the image density is associated with each coordinate of the surface of the metal roll, which will be described later. Here, for the grayscale image data, the planar view pattern data obtained in the pattern creation step S11 is used. The grayscale image data obtained in the pattern creation step S11 is adjusted and corrected in consideration of laser engraving characteristics so as to obtain a desired uneven shape. Here, the grayscale image data for the laser light engraving process can be created in TIFF format with 8-bit image grayscale (256 grayscales) and a resolution of 2540 dpi.

(2) Metal Roll Preparing Step In parallel with the above step (1), a metal roll 20 for plate engraving as shown in FIG. 5 is prepared. The metal roll 20 is formed by plating a copper layer on the surface of a hollow iron cylinder having rotary drive shafts 21 at both ends in the axial direction. The surface of the metal roll 20 is roughened by polishing with a whetstone to prevent a decrease in engraving efficiency due to specular reflection of engraving laser light.

(3) Laser beam engraving process As schematically shown in FIG. 5, a laser beam direct engraving machine is used to convert the surface of the metal roll 20 prepared in step (2) into the grayscale image data created in step (1). Sculpture based on As a result, on the surface is formed an uneven shape that has the same planar shape as the unevenness on the surface of the decorative material as shown in FIG.
Therefore, the shape that the unevenness of the plate should have is the same as the unevenness relationship of the unevenness shape portion 12 of the above-described decorative material.

The metal roll 20 is driven by an electric motor via its rotary drive shaft 21 and rotates about the rotary drive shaft 21 as its central axis. The entire surface of the metal roll 20 is scanned with a fiber laser beam _LA emitted from the laser head 22 having an oscillation wavelength of 1024 nm, a laser spot diameter of 10 μm, and an output of 600 W. At that time, the laser light is switched ON-OFF (switching between irradiation and non-irradiation) according to the density value of the grayscale image data created in step (1), and the irradiation position is irradiated with the metal once by laser light irradiation. to form recesses with a depth of 10 μm. Scanning of the metal roll surface with such laser light is repeated 10 times. Further, in order to prevent the evaporated metal from turning into powder and remaining on or adhering to the surface of the metal roll 20, the engraving liquid T was sprayed from the engraving liquid discharge port 23 onto the laser beam irradiated area of the surface of the metal roll 20. Laser light irradiation is performed in this state.
At that time, for example, at the position coordinates of the image density corresponding to the plate depth of 50 μm on the data, the laser light is irradiated (ON) only for the first five scans out of a total of ten scans, and for the remaining five scans The laser light is controlled to be non-irradiation (OFF).
By completing the scanning of the laser beam, a desired uneven shape is formed on the surface of the metal roll 20 .

(4) Electropolishing Step After cleaning the engraving liquid, electropolishing is performed to remove metal residue adhering to the surface of the metal roll 20 .

(5) Chromium Plating Step After step (4), a chromium layer having a thickness of 10 μm is formed on the surface of the metal roll by plating.

As described above, it is possible to obtain a plate (molding die for shaped sheet) having the same uneven shape as the unevenness formed on the surface of the linear groove portion 12 on the surface.

<Shaped sheet preparation step S13>
In the shaped sheet producing step S13, a shaping method disclosed in Japanese Patent Application Laid-Open No. 57-87318, Japanese Patent Application Laid-Open No. 7-32476, etc. can be used. First, an uncured liquid composition of an ionizing radiation curable resin containing an acrylate monomer was applied to the uneven surface of the plate made of the metal roll prepared in the plate preparation step S12, and then subjected to an easy-adhesion treatment. The easy-adhesive side of a biaxially stretched PET sheet having a thickness of 50 μm is superimposed and irradiated with an electron beam to cure the uncured liquid material into a cured material. The molded sheet is released from the mold to prepare a shaped sheet consisting of a PET sheet and a cured product layer of an ionizing radiation-curable resin laminated on the sheet and having unevenness 12' on its surface.
As a result, it is possible to obtain a shaped sheet having an uneven shape (reverse unevenness) 12' having the same shape in plan view as the unevenness formed on the surface of the uneven shape portion 12 and having an opposite unevenness relationship (reverse unevenness) on the surface. FIG. 6 shows a diagram for explaining the irregularities on the surface of the shaped sheet 10'. As can be seen from FIG. 6, on the surface of the cured product layer of the base material 11' of the shaped sheet 10' (consisting of a release base sheet and an ionizing radiation-curable acrylate monomer cured on one surface thereof), The concave-convex shaped portion 12' to be formed has concave filaments 13' and convex portions 14'. The recessed filaments 13' have the same shape in a plan view as the protrusions formed by the protruded filaments 13 of the concave-convex shaped portion 12, and have concaves opposite thereto. Similarly, the convex portion 14' has the same shape in plan view as the concave formed by the concave portion 14 of the concave-convex shaped portion 12, and has a convex shape opposite thereto. Therefore, the shapes of the concave filaments 13' and the convex portions 14' can be considered to be the same as those of the convex filaments 13 and the concave portions 14, except that the concavities and convexities are reversed.
As shown in FIG. 7, another base material (backing sheet) 11'' is laminated on the surface of the shaping sheet 10' opposite to the surface of the base material 11' on which the concave-convex portions 12' are formed. good too.

<Shaping step S14>
The shaping step S14 is performed as follows.
First, a titanium paper base paper is impregnated with a liquid uncured composition of a thermosetting resin containing melamine formaldehyde resin using an impregnation device so that the uncured composition has a predetermined proportion when dried, and then dried. By doing so, an impregnated decorative sheet is obtained.
Next, this impregnated decorative sheet is laminated on a core paper impregnated with phenolic resin, which is obtained by impregnating kraft paper with a resin liquid composed of phenolic resin. The sheets are laminated so that the printed surface of the sheet is in contact with the surface of the impregnated decorative sheet on which the concave and convex portions 12' are formed.
The laminate thus formed is sandwiched between two metallic mirror plates, and while applying pressure using a heat press, heat molding is performed under predetermined temperature and time conditions to obtain the uncured composition. is heat cured. Thereby, a cured resin layer containing melamine resin is formed.
Finally, the decorative material 10 is obtained by peeling off the shaping sheet from the cured resin layer of the laminate taken out from the hot press which has been cooled to room temperature and released from the pressure.

In the above steps S11 to S13, a shaping sheet can be produced by a shaping sheet producing step S13' using fine particles instead of step S13. In this case, a coating ink containing fine particles is applied to one of the surfaces of the base material to be the backing sheet, and a part of the fine particles protrudes to form the projections 14'. Then, by curing the coating ink, recessed lines 13' are formed in the process, and a shaped sheet having the same shape as the shaped sheet 10' can be obtained. For example, by adjusting the type of resin binder of the ink to be applied, the particle size and addition amount of the fine particles, the coating amount of the ink, and the curing conditions of the ink, the uneven shape 12' having a desired shape is obtained.
After producing the shaped sheet, the decorative material can be obtained by the same steps as the shaping step S14.

A decorative material was produced following the decorative material 10 and used as an example. In addition, a decorative material having no concave-convex shape was produced as a comparative example.

[Shape and Production of Decorative Material of Example]
The decorative material according to Example 1 is as shown in FIG. 1 in plan view. The shape and arrangement of the concave-convex portions provided in this decorative material are as follows. In addition, the following numerical values are the results of measuring within a range of 5 mm×5 mm in plan view of the decorative material. Measurement items and measurement methods are as described above.
・Width of ridge 13: maximum 115 μm, minimum 3 μm
・Difference in height between the convex filament 13 and the bottom of the concave portion 14: maximum 35 μm, minimum 3 μm
・Diameter of concave portion 14: maximum 50 μm, minimum 3 μm
・Area ratio of the convex linear portion 13 and the concave portion 14: the area of the convex linear portion is 8% to 34% of the concave portion area

In this example, a shaped sheet was produced following the shaped sheet producing step S13'. Specifically, it is as follows.
A biaxially oriented PET sheet (Cosmoshine (registered trademark) A4100 (50 μm) manufactured by Toyobo Co., Ltd.) having a thickness of 50 μm and having an easy-adhesion treatment was prepared.
In addition, ionizing radiation-curable acrylate monomer (manufactured by Toagosei Co., Ltd., Aronix (registered trademark) M350) 100 parts by weight, reactive silicone (manufactured by Shin-Etsu Chemical Co., Ltd., X-22-164B) 2 parts by weight, average particle size 15 μm A coating ink containing 100 parts by mass of acrylic fine particles (manufactured by Toyobo Co., Ltd., Tuftic FHS015), 40 parts by mass of isopropyl alcohol, and 40 parts by mass of ethyl acetate was also prepared.
The prepared coating ink is applied to the easy-adhesive surface of the PET sheet by kiss reverse using an 80L95μ oblique plate, and is cured by irradiation with an electron beam of 5 Mrad at an acceleration voltage of 165 kV. A shaped sheet was obtained.

Next, following the shaping step S14, a decorative material according to an example was obtained. Specifically, it is as follows.
First, a liquid uncured composition of a thermosetting resin comprising 60 parts by mass of melamine formaldehyde resin, 35 parts by mass of water, and 5 parts by mass of isopropyl alcohol was prepared.
This uncured composition was impregnated into a titanium paper base paper having a basis weight of 100 g/m ² using an impregnation device. At this time, the impregnation was carried out so that the uncured composition had a dry ratio of 80 g/m ² (dry). By drying this, an impregnated decorative sheet was obtained.

Next, this impregnated decorative sheet was laminated on three sheets of phenolic resin-impregnated core paper (Ohta Core, Ohta Sangyo Co., Ltd.) having a basis weight of 245 g/m ² , which was obtained by impregnating kraft paper with a resin liquid composed of phenolic resin.
Furthermore, the shaping sheet prepared on the impregnated decorative sheet was laminated so that the uneven surface of the shaping sheet was in contact with the printed surface of the impregnated decorative sheet.
Thereafter, the formed laminate was sandwiched between two mirror plates, and heat-molded using a heat press under the conditions of a pressure of 100 kg/cm ² and a molding temperature of 150° C. for 10 minutes to heat the uncured composition. A cured resin layer containing a melamine resin was formed by curing.

Finally, the shaping sheet was peeled off from the cured resin layer to obtain the decorative material according to the example.

[Shape and preparation of decorative material of comparative example]
As the decorative material of the comparative example, a shaped sheet was produced using a so-called sandblasted matte film that does not have the above-described concave-convex shape portion. Using this shaped sheet, a decorative material of Comparative Example was obtained in the same manner as the decorative material of Example. FIG. 8 shows an enlarged plan view of a part of the decorative material according to the comparative example. FIG. 8 is the same viewpoint and scale as FIG.

[Evaluation method/result]
Quantitative evaluation of the anti-fingerprint property of the decorative material and the anti-fingerprint property based on the color difference ΔE were performed. Table 1 shows the results.
"Fingerprint resistance (visual observation)" was evaluated by touching the surface of the decorative material with a finger and observing visually.
“Fingerprint resistance (colorimetric ΔE value)” was obtained by measuring ΔE ^* _ab with a spectrophotometer CM-370 manufactured by Konica Minolta Co., Ltd. as described above.

As can be seen from the results, the decorative materials according to the examples are excellent in fingerprint resistance both visually and quantitatively.

REFERENCE SIGNS LIST 10 Decorative material 11 Base material 12 Concavo-convex shape part 13 Convex filament 14 Recess 10' Shaping sheet 13' Concave filament 14' Convex part

Claims (3)

A decorative material having unevenness on the surface,
Having a base material and a concave-convex shape part in which a plurality of convex filaments and concave parts are arranged on the surface of the base material,
The decorative material, wherein the protruding filament is a filament having both ends in a plan view, and the concave portion has a part of a spherical surface and is arranged between the adjacent protruding filaments. 2. The decorative material according to claim 1, wherein said base material and said concave-convex portion contain melamine resin. A shaping sheet for manufacturing a decorative material,
A substrate, and a plurality of concave filaments and convex portions are arranged on the surface of the substrate,
The shaping sheet, wherein the concave filament is a filament having both ends in a plan view, and the convex portion having a part of a spherical surface is arranged between the plurality of concave filaments.

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