JP2020049844A - Laminated body and decorative article - Google Patents

Abstract

Kind Code: A1 A laminate is provided that exhibits different designs when a light source is turned on and when it is turned off. A first design layer (21) includes a first main surface (11) arranged on an observer side and a second main surface (12) arranged on a light source (30) side, and at least a first design layer (21) is provided in order from the second main surface (12) side. , a second design layer 22, and a transparent substrate layer 1, wherein the surface of the transparent substrate layer 1 on the side of the second design layer 22 is provided with an uneven shape. There is a laminate. [Selection drawing] Fig. 6

Description

  The present invention relates to a laminate and a decorative article.

  2. Description of the Related Art Conventionally, decorative resin molded products obtained by laminating a decorative sheet on the surface of a resin molded product have been used for vehicle interior / exterior parts, building material interior materials, home electric appliance housings, and the like. In the production of such a decorative resin molded product, a molding method of integrating a decorative sheet, which is provided with a design in advance, with a resin by injection molding is used. As a typical example of such a molding method, a decorative sheet is previously formed into a three-dimensional shape by a vacuum forming die, the decorative sheet is inserted into an injection molding die, and a resin in a fluid state is injected into the die. In this case, an insert molding method for integrating the resin and the decorative sheet with each other may be used.

  Since the decorative resin molded product obtained by such a molding method is used in various applications such as interior and exterior parts of a vehicle as described above, it has a three-dimensional moldability that can follow three-dimensional molding and a surface with scratch resistance. With the diversification of consumer tastes in recent years, in addition to surface characteristics such as properties, various design feelings have been required. For example, development has been promoted such as giving a texture to a resin molded product by applying matting or unevenness to a specific portion of a pattern (for example, Patent Document 1). Further, a synthetic resin molded part having a changing design surface has been proposed as having various design feelings (for example, Patent Document 2).

  Further, there has been proposed a decorative sheet in which a light source is disposed on the side opposite to the observer side of the decorative sheet, and which exhibits different designs when the light source is turned on and when the light source is turned off (for example, Patent Document 3).

JP 2009-132145 A JP 2010-125817 A JP 2013-14051 A

  As described above, there are known decorative sheets that exhibit different designs when the light source is turned on and when the light source is turned off. In such a decorative sheet, when the light source is turned off, it is desirable that the design appearing when the light source is turned on is not visually recognized, and that the design is visible only when the light source is turned on.

  However, in the conventional decorative sheet, even when the light source is turned off, there may be a problem that a design developed when the light source is turned on is visually recognized. In particular, in a decorative sheet in which two design layers are arranged to exhibit different designs when the light source is turned on and when the light source is turned off, a single-color design layer is provided on the entire viewer side, and a pattern-like design is provided on the light source side. When the layer is provided, there is a problem that the design of the design layer on the light source side is easily visible from the observer side even when the light is turned off, and such a problem is easily caused.

  In addition, in a preforming process of forming the decorative sheet into a three-dimensional shape in advance by a vacuum forming die, or in a process of integrating the decorative sheet with a resin by injection molding, high heat and pressure are applied to the decorative sheet. Even when such a defect does not occur, a defect may occur after molding.

  The main object of the present invention is to provide a laminate that exhibits different designs when the light source is turned on and when the light source is turned off. Further, another object of the present invention is to provide a decorative article using the laminate.

  The present inventors have conducted intensive studies in order to solve the above problems. As a result, it has a first principal surface arranged on the observer side and a second principal surface arranged on the light source side, and at least in order from the second principal surface side, at least a first design layer and a second design layer In a laminated sheet comprising a transparent base material layer and the transparent base material layer, the above-described inconvenience is unlikely to occur by providing an irregular shape on the surface of the transparent base material layer on the second design layer side, and is different between when the light source is turned on and when the light source is turned off. It has been found that a design is expressed.

  The present invention has been completed by further study based on these findings.

That is, the present invention provides the following aspects of the invention.
Item 1. A first main surface disposed on the observer side and a second main surface disposed on the light source side;
A laminated body comprising at least a first design layer, a second design layer, and a transparent base material layer, in order from the second main surface side,
A laminate, wherein a surface of the transparent substrate layer on the side of the second design layer is provided with an uneven shape.
Item 2. The first design layer has a pattern-like design,
Item 2. The laminate according to Item 1, wherein the second design layer has a monochromatic design over the entire surface.
Item 3. Item 3. The laminate according to Item 1 or 2, further comprising a transparent backer layer on the second main surface side of the first design layer.
Item 4. The laminate according to any one of Items 1 to 3, wherein the laminate is in a sheet shape.
Item 5. Item 5. The laminate according to any one of Items 1 to 4, further comprising a transparent molding resin layer on the second main surface side of the first design layer.
Item 6. The laminate according to any one of Items 1 to 5,
A light source disposed on a second main surface side of the laminate,
A decorative article comprising:

  ADVANTAGE OF THE INVENTION According to this invention, the laminated body which expresses a different design at the time of turning on and off of a light source can be provided. Further, according to the present invention, it is possible to provide a decorative article using the laminate.

It is a typical sectional view of an example of a layered product of the present invention. It is a typical sectional view of an example of a layered product of the present invention. It is a typical sectional view of an example of a layered product of the present invention. It is a typical sectional view of an example of a layered product of the present invention. It is a typical sectional view of an example of a layered product of the present invention. It is a typical sectional view of an example of a decorative article using a layered product of the present invention.

1. Laminate The laminate of the present invention includes a first principal surface arranged on the viewer side and a second principal surface arranged on the light source side, and at least the first design layer in order from the second principal surface side. And a laminate comprising a second design layer and a transparent base material layer, characterized in that the transparent base material layer has an uneven shape on the surface of the second design layer side. The laminate of the present invention having such a configuration can exhibit different designs when the light source is turned on and when the light source is turned off.

  The laminate of the present invention can be suitably used for decorating the surface of a resin molded product such as a vehicle interior / exterior component, a building material interior material, and a home appliance housing. Therefore, the laminate of the present invention can be suitably used as a decorative sheet for three-dimensional molding. In particular, when the laminate of the present invention is in the form of a sheet, it can be molded as a decorative sheet for three-dimensional molding and laminated with the molded resin layer 4 described later to form a decorative resin molded product.

  Hereinafter, the laminate of the present invention will be described in detail with reference to FIGS. In this specification, the numerical range indicated by “to” means “over” and “below”, except where explicitly described as “over” and “below”. For example, the notation of 2 to 15 mm means 2 mm or more and 15 mm or less. In this specification, “(meth) acrylate” means “acrylate or methacrylate”, and other similar substances have the same meaning.

Laminate Structure of Laminate The laminate 10 of the present invention includes, for example, as shown in FIGS. 1 to 6, a first main surface 11 disposed on the viewer side and a second main surface disposed on the light source side. 12 are provided. Specifically, when the laminate 10 of the present invention is used for various applications such as vehicle interior / exterior parts, building material interior materials, and home electric appliance housings, the first main surface 11 is disposed on the observer side, The two main surfaces 12 are arranged on the light source side.

  The laminate 10 of the present invention includes a laminate including at least a first design layer 21, a second design layer 22, and the transparent base material layer 1 in order from the second main surface 12 side. In the laminate 10 of the present invention, the surface of the transparent base material layer 1 on the side of the second design layer 22 is provided with an uneven shape. Since the light is scattered by the transparent base material layer 1 having the uneven shape, the design based on the first design layer 21 is hardly visually recognized at the time of turning off the light.

  The uneven shape of the transparent base material layer 1 may be provided on both the first main surface 11 side and the second main surface 12 side.

  As shown in FIGS. 1 to 6, different designs are exhibited when the light source is turned on and when the light source is turned off. When the light source is turned off, the design based on the second design layer 22 is visually recognized, and the design based on the first design layer 21 is displayed. It is preferable that the second design layer 22 also has a concavo-convex shape from the viewpoint of making the second design layer 22 hard to be visually recognized. Since the light is scattered by the second design layer 22 having the uneven shape, the design based on the first design layer 21 becomes difficult to be visually recognized when the light is turned off. For example, in the schematic diagrams of FIGS. 1 to 6, the transparent base material layer 1 and the second design layer 22 are in contact with each other, and the interface between these layers has an uneven shape.

  When the second design layer 22 has an uneven shape, the uneven shape may be provided on the second main surface 12 side, or provided on the first main surface 11 side as shown in FIGS. Alternatively, as shown in FIGS. 3 to 6, it may be provided on both the first main surface 11 side and the second main surface 12 side.

  Further, in the laminate 10 of the present invention, the first design layer 21 may have an uneven shape. When the first design layer 21 has an uneven shape, the uneven shape may be provided on the second main surface 12 side, may be provided on the first main surface 11 side, and FIGS. As shown in FIG. 6, it may be provided on both the first main surface 11 side and the second main surface 12 side. The concavo-convex shape of the first design layer 21 corresponds to, for example, the concavo-convex shape of the second design layer 22 and the concavo-convex shape of the transparent base material layer 1.

  In the laminate 10 of the present invention, the uneven shape of each layer can be provided by, for example, embossing as described later.

  In the laminate 10 of the present invention, the transparent base material layer 1 can also function as a surface protection layer, and the surface of the laminate 10 can be provided with surface protection performance such as scratch resistance and chemical resistance. A primer layer (not shown) may be provided as necessary for the purpose of enhancing the adhesion between the transparent base material layer 1 and a layer located thereunder (such as the second design layer 22). Is also good. Further, as shown in FIGS. 2 to 6, a transparent backer is provided on the second main surface 12 side (back surface side) of the first design layer 21 in order to impart rigidity to the laminate 10 and maintain the shape. Layer 3 can be provided. When the molding resin layer 4 is laminated on the second main surface 12 side, the first design layer 21 (or transparent layer) is formed for the purpose of enhancing the adhesion between the laminate 10 of the present invention and the molding resin layer 4. A back surface adhesive layer (not shown) may be provided on the second main surface 12 side (back surface side) of the backer layer 3 and the like, if necessary.

  In the laminate of the present invention, one or more other layers may be further laminated according to the function imparted to the laminate or the decorative article.

  As a laminated structure of the laminate of the present invention, a laminated structure in which a first design layer / second design layer / transparent base material layer is laminated in this order; transparent backer layer / first design layer / second design layer / transparent base material Laminated structure in which layers are laminated in this order; molded resin layer / transparent backer layer / first design layer / second design layer / laminate structure in which transparent substrate layer is laminated in this order; molded resin layer / transparent backer layer / 1 design layer / second design layer / primer layer / transparent base material layer in this order; molded resin layer / backside adhesive layer / transparent backer layer / first design layer / second design layer / primer layer / A laminated structure in which a transparent base material layer is laminated in this order is exemplified. FIG. 1 is a schematic cross-sectional view showing an example of a laminate in which a first design layer / second design layer / transparent base material layer is laminated in this order as one embodiment of a laminate structure of the laminate of the present invention. FIGS. 2 to 4 are schematic views of an example of a laminate in which a transparent backer layer / first design layer / second design layer / transparent base material layer is laminated in this order as one embodiment of the laminate structure of the laminate of the present invention. FIG. FIG. 5 shows an example of a laminate in which a transparent base layer / transparent backer layer / first design layer / second design layer / transparent base layer is laminated in this order as one embodiment of the laminate structure of the laminate of the present invention. 1 shows a schematic sectional view of FIG.

Each layer forming the laminate [Transparent base material layer 1]
The transparent base material layer 1 is a layer provided for the laminate 10 of the present invention to exhibit different designs when the light source is turned on and when the light source is turned off, and is provided on the second design layer 22 side of the transparent base material layer 1. Since the surface is provided with an uneven shape and the first design layer 21 and the second design layer 22 described later are provided, when the light source is turned off, the entire monochrome design of the second design layer 22 is visually recognized. In this configuration, the design of the first design layer 21 is not visually recognized, and when the light source is turned on, the pattern-like design of the first design layer 21 (for example, a pattern described later such as a symbol or character information) is visually recognized. It is possible to do.

  Moreover, the transparent base material layer 1 can also function as a surface protection layer, and surface protection performance such as scratch resistance and chemical resistance can be imparted to the surface of the laminate 10.

  As shown in FIG. 6, when the light source 30 is disposed on the second main surface 12 side, the transparent base material layer 1 is transparent enough to transmit light from the light source (in the present invention, the transparent Transparency is also included). That is, the transparent base material layer 1 is usually transparent (colorless and transparent, colored and transparent, and translucent), and when the laminate 10 of the present invention is observed from the first main surface 11 side, the first design layer 21 It may be colored as long as the design based on it is visible. For example, the transparent substrate layer 1 may include a matting agent such as silica, a coloring agent, and the like. As the coloring agent, the coloring agents exemplified in the second design layer 22 described later can be used. Further, the transparent base material layer 1 may be subjected to coating for adjusting colors, formation of a pattern for imparting designability, and the like.

  As described above, the transparent base material layer 1 has an uneven shape on the surface on the second design layer side. The uneven shape of the transparent base material layer 1 may be provided on both the first main surface 11 side and the second main surface 12 side.

  When the light source is turned on and turned off, a different design is exhibited. When the light source is turned off, the design based on the second design layer 22 is visually recognized, and the design based on the first design layer 21 is hardly viewed from the viewpoint of being transparent. The depth D of the concave portion of the concave and convex shape of the base material layer 1 is preferably about 5 to 100 μm, and more preferably 8 to 60 μm. The depth of the concave portion can be measured, for example, by cross-sectional observation using a microscope. The depth D of the concave portion is, as shown in FIG. 1, the height of the convex portion from the concave portion of the transparent base material layer 1 on the second main surface 12 side. The depth D of the concave portion is appropriately adjusted according to the thickness of the transparent base material layer 1 and the like.

  In addition, from the same viewpoint, the width W of the concave portion of the concave-convex shape of the transparent base material layer 1 is preferably about 10 to 100 μm, and more preferably about 20 to 40 μm. The width W of the concave portion can be measured by, for example, cross-sectional observation using a microscope. The width W of the concave portion is, as shown in FIG. 1, a distance between adjacent convex portions of the transparent base material layer 1 on the second main surface 12 side.

  The uneven shape of the transparent base material layer 1 can be suitably formed by, for example, embossing. For example, if the first main surface 11 side is provided with an uneven shape, at least the transparent base material layer 1 is prepared, and the surface to be the first main surface 11 side is embossed to form the transparent base material layer. An uneven shape can be formed on one surface of the first member. Next, the laminate 10 is obtained by laminating the second design layer 22, the first design layer 21, and the like on the surface on which the uneven shape is formed. At this time, by adjusting the depth of the concave portion formed by the embossing, it is also possible to form the concavo-convex shape on the second design layer 22 and the first design layer 21 by one embossing.

  The embossing is a known method. For example, the layer softened by heating is pressed with an embossing plate, and the uneven pattern formed on the embossing plate is formed on the surface of the transparent base material layer 1, cooled, and fixed. Is the way. For embossing, a known single-wafer or rotary embossing machine can be used.

  Even when another layer such as a primer layer is provided, for example, by laminating another layer such as a primer layer on the transparent base material layer 1 on which the uneven shape is formed, the uneven shape is formed on the primer layer or the like. Can be formed.

  The transparent base material layer 1 can be made of a transparent resin or the like from the viewpoint of appropriately expressing different designs when the light source is turned on and when the light source is turned off while making the laminate 10 suitable for three-dimensional molding. It is preferable that the transparent resin is formed of a transparent thermoplastic resin. The transparent thermoplastic resin is not particularly limited, but is a transparent acrylonitrile-butadiene-styrene resin (hereinafter sometimes referred to as “ABS resin”), an acrylic resin; a polyolefin-based resin such as polypropylene and polyethylene; a polycarbonate resin; Vinyl chloride resin; polyethylene terephthalate (PET) resin; acrylonitrile-styrene-acrylate resin, and the like. Among these, the transparent base material layer 1 is preferably formed of a transparent acrylic resin. The resin forming the transparent base material layer 1 may be one type or two or more types.

  The thickness of the transparent base material layer 1 is not particularly limited, but from the viewpoint of suitably expressing different designs between when the light source is turned on and when the light source is turned off, while making the laminate 10 suitable for three-dimensional molding, the lower limit is set. Is preferably 30 μm or more, more preferably 100 μm or more, and the upper limit is preferably 300 μm or less, more preferably 200 μm or less, and the preferable range is about 30 to 300 μm or about 100 to 200 μm. Can be In addition, the thickness of the transparent base material layer 1 is the thickness at the position of the convex portion of the uneven shape.

  The transparent base material layer 1 may be subjected to a physical or chemical surface treatment such as an oxidation method or a roughening method on one or both surfaces thereof, if necessary, in order to improve the adhesion between the transparent substrate layer 1 and the adjacent layer. Good. Examples of the oxidation method performed as the surface treatment of the transparent base material layer 1 include a corona discharge treatment, a plasma treatment, a chromium oxidation treatment, a flame treatment, a hot air treatment, and an ozone ultraviolet treatment. In addition, examples of a method of forming a surface roughness of the transparent base material layer 1 include a sand blast method and a solvent treatment method. These surface treatments are appropriately selected according to the type of the resin constituting the transparent base material layer 1. From the viewpoint of effects and operability, a corona discharge treatment method is preferably used.

[Second design layer 22]
The second design layer 22 is a layer provided between the transparent base material layer 1 and the first design layer 21 for the purpose of imparting decorative properties to the laminate. The design of the second design layer 22 is a design visually recognized from the first main surface 11 side when the light source on the second main surface 12 side is turned off, and when the light source is turned on, the design of the first design layer 21 is It is visually recognized through the second design layer 22.

  From the viewpoint of exhibiting different designs between when the light source is turned on and when the light source is turned off, and when the light source is turned off, the design based on the second design layer 22 is visually recognized, and the design based on the first design layer 21 is hardly viewed. As described above, it is preferable that the second design layer 22 also has an uneven shape. Since the light is scattered by the second design layer 22 having the uneven shape, the design based on the first design layer 21 is more difficult to visually recognize when the light is turned off.

  When the second design layer 22 has an uneven shape, the uneven shape may be provided on the first main surface 11 side as shown in FIGS. 1 and 2 or provided on the second main surface 12 side. Alternatively, as shown in FIGS. 3 to 6, it may be provided on both the first main surface 11 side and the second main surface 12 side.

  The second design layer 22 can be, for example, a layer in which a desired pattern is formed using an ink composition. For example, when the first design layer 21 described later has a pattern design and the second design layer 22 has a single-color design, when the light source is turned off, the second design layer 22 has a single-color design. The design is visually recognized, the design of the first design layer 21 is not visually recognized, and when the light source is turned on, the pattern-like design of the first design layer 21 (for example, a pattern described later such as a symbol or character information) is visually recognized. It is possible to configure so that.

  In addition, the second design layer 22 may be provided partially on the transparent base material layer 1, may be provided on the entire surface, and is preferably provided on the entire surface.

  The second design layer 22 can be formed, for example, by printing the ink for forming the second design layer on the transparent base material layer 1 by a conventionally known printing method such as gravure printing, silk screen printing, or offset printing. it can. As the ink composition used to form the second design layer 22, a mixture of a binder, a coloring agent such as a pigment and a dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, a curing agent, and the like is used as appropriate. Is done.

  The binder used in the ink composition is not particularly limited, and examples thereof include a polyurethane resin, a vinyl chloride / vinyl acetate copolymer resin, a vinyl chloride / vinyl acetate / acryl copolymer resin, a chlorinated polypropylene resin, and an acrylic resin. , Polyester resin, polyamide resin, butyral resin, polystyrene resin, nitrocellulose resin, cellulose acetate resin and the like. These binders may be used alone or in a combination of two or more.

  The colorant used in the ink composition is not particularly limited. For example, carbon black (black ink), iron black, titanium white, antimony white, graphite, titanium yellow, red stalk, cadmium red, ultramarine, cobalt blue Organic pigments or dyes such as quinacridone red, isoindolinone yellow, and phthalocyanine blue; metal pigments composed of scale-like foil pieces such as aluminum and brass; scale-like foils such as titanium dioxide-coated mica and basic lead carbonate A pearl luster (pearl) pigment composed of pieces may be used.

  The pattern formed by the second design layer 22 is also not particularly limited, but is, for example, a symbol or character information, or a stone pattern that imitates the surface of a rock such as a wood pattern or a marble pattern (for example, a travertine marble pattern). And a cloth pattern, a tiled pattern, a brickwork pattern, and the like that imitate a cloth pattern or a cloth-like pattern, and may be a pattern such as a parquet or a patchwork that is a composite of these, or a single-color solid color (so-called solid color). It may be. These patterns are formed by multicolor printing using normal yellow, red, blue, and black process colors, but also by multicolor printing using special colors prepared by preparing individual color plates constituting the pattern. Can be formed.

  Further, the second design layer 22 may include a portion constituted by a metal thin film. Examples of the metal forming the metal thin film include tin, indium, chromium, aluminum, nickel, copper, silver, gold, platinum, zinc, and alloys containing at least one of these. The method for forming the metal thin film is not particularly limited, and examples thereof include an evaporation method such as a vacuum evaporation method, a sputtering method, and an ion plating method using the above metals. In addition, a primer layer using a known resin may be provided on the front surface and the back surface of the metal thin film in order to improve the adhesiveness with an adjacent layer.

  As described above, the second design layer 22 preferably has a monochrome design.

  The thickness of the second design layer 22 is not particularly limited, but the lower limit is preferably 1 μm or more, and the upper limit is preferably 20 μm or less, more preferably 10 μm or less, and the preferred range is about 1 to 20 μm. About 1 to 10 μm. When the second design layer 22 has an uneven shape, the thickness of the second design layer 22 is the thickness at the position of the convex portion of the uneven shape.

[First design layer 21]
The first design layer 21 is a layer provided on the second design layer 22 for the purpose of imparting decorative properties to the laminate 10 and the like. The design of the first design layer 21 is a design visually recognized from the first main surface 11 side when the light source on the second main surface 12 side is turned on, and when the light source is turned off, the design of the first design layer 21 is: The design of the second design layer 22 is hardly visually recognized from the first main surface 11 side.

  The first design layer 21 can be, for example, a layer in which a desired pattern is formed using an ink composition. As described above, for example, when the second design layer 22 has a monochromatic design on the entire surface and the first design layer 21 has a pattern design, when the light source is turned off, the entire surface of the second design layer 22 is turned off. When the monochromatic design is visually recognized, the design of the first design layer 21 is not visually recognized, and when the light source is turned on, the pattern-like design of the first design layer 21 (for example, the above-described pattern such as a symbol or character information) is not observed. It becomes possible to constitute so that it may be visually recognized.

  The first design layer 21 may be provided partially on the second main surface 12 side of the second design layer 22, or may be provided on the entire surface.

  Like the second design layer 22, the first design layer 21 is formed by applying an ink for forming the first design layer to the second design layer 22 by a conventionally known printing method such as gravure printing, silk screen printing, or offset printing. Can be formed by printing on the surface. Examples of the ink composition used for forming the first design layer 21 include the same ones as those exemplified for the second design layer 22, including a binder, a colorant, and the like.

  As for the pattern formed by the first design layer 21, the same pattern as that exemplified in the second design layer 22 is exemplified. However, the first design layer 21 has the pattern design as described above. Is preferred.

  Further, the first design layer 21 may include a portion constituted by a metal thin film. As the metal for forming the metal thin film, the forming method, and the like, the same as those exemplified for the second design layer 22 are exemplified.

  The thickness of the first design layer 21 is not particularly limited, but the lower limit is preferably 1 μm or more, and the upper limit is preferably 30 μm or less, more preferably 20 μm or less, and the preferable range is about 1 to 30 μm. , About 1 to 20 μm. When the first design layer 21 has an uneven shape, the thickness of the first design layer 21 is a thickness at a position of a convex portion of the uneven shape.

[Transparent backer layer 3]
The transparent backer layer 3 is a layer provided as necessary in order to impart rigidity to the laminate 10 and maintain the shape. When the laminate 10 is in the form of a sheet, the laminate 10 is provided in order to form a laminate suitable for vacuum molding (three-dimensional molding) by insert molding or the like.

  As shown in FIG. 6, when the light source 30 is disposed on the second main surface 12 side, the transparent backer layer 3 is transparent enough to transmit light from the light source (in the present invention, transparent is semi-transparent). Is also included). That is, the transparent backer layer 3 is usually transparent (colorless and transparent, colored transparent and translucent), and is based on the first design layer 21 when the laminate 10 of the present invention is observed from the first main surface 11 side. It may be colored as long as the design is visible. For example, the transparent backer layer 3 may include a matting agent such as silica, a coloring agent, and the like. As the coloring agent, the coloring agents exemplified in the second design layer 22 can be used. Further, the transparent backer layer 3 may be provided with a coating for adjusting colors, formation of a pattern for providing design, and the like.

  The transparent backer layer 3 may have an uneven shape. When the transparent backer layer 3 has an uneven shape, the uneven shape is preferably provided on the first main surface 11 side as shown in FIGS. The uneven shape of the transparent backer layer 3 corresponds to, for example, the uneven shape of the first design layer 21, the uneven shape of the second design layer 22, and the uneven shape of the transparent base material layer 1. In addition, about formation of the uneven | corrugated shape of the transparent backer layer 3, for example, the 1st design layer 21 and the 2nd design layer 22 are sequentially laminated | stacked on the transparent base material layer 1 in which the uneven | corrugated shape was formed by embossing, Further, by laminating the transparent backer layer 3 softened by heating from above, an uneven shape is formed on the first main surface 11 side of the transparent backer layer 3.

  The transparent backer layer 3 is made of a transparent resin, a paper base material, or the like from the viewpoint of appropriately expressing different designs when the light source is turned on and when the light source is turned off, while making the laminate 10 suitable for three-dimensional molding. Can be. It is preferable that the transparent resin is formed of a transparent thermoplastic resin. The transparent thermoplastic resin is not particularly limited, but is a transparent acrylonitrile-butadiene-styrene resin (hereinafter sometimes referred to as “ABS resin”), an acrylic resin; a polyolefin-based resin such as polypropylene and polyethylene; a polycarbonate resin; Vinyl chloride resin; polyethylene terephthalate (PET) resin; acrylonitrile-styrene-acrylate resin, and the like. Among these, the transparent backer layer 3 is preferably formed of a transparent ABS resin. The resin forming the transparent backer layer 3 may be one type or two or more types.

  The thickness of the transparent backer layer 3 is not particularly limited, but from the viewpoint of suitably expressing different designs between when the light source is turned on and when the light source is turned off, while making the laminate 10 suitable for three-dimensional molding, the lower limit is set as follows. , Preferably 50 μm or more, more preferably 100 μm or more, and the upper limit is preferably 1000 μm or less, more preferably 500 μm or less, and the preferred range is about 50 to 1000 μm or about 100 to 500 μm. . More specifically, when a transparent ABS resin is used as the transparent backer layer 3, the thickness is more preferably about 100 to 500 μm, and further preferably about 200 to 400 μm. When the transparent backer layer 3 has an uneven shape, the thickness of the transparent backer layer 3 is the thickness at the position of the convex portion of the uneven shape.

  The transparent backer layer 3 may be subjected to a physical or chemical surface treatment such as an oxidation method or an unevenness method on one or both surfaces thereof, if necessary, in order to improve the adhesiveness with an adjacent layer. . Examples of the oxidation method performed as the surface treatment of the transparent backer layer 3 include a corona discharge treatment, a plasma treatment, a chromium oxidation treatment, a flame treatment, a hot air treatment, and an ozone ultraviolet treatment. In addition, examples of a method of forming a surface roughness of the transparent backer layer 3 include a sand blast method and a solvent treatment method. These surface treatments are appropriately selected according to the type of the resin constituting the transparent backer layer 3, and preferably a corona discharge treatment method from the viewpoint of effects and operability.

[Backside adhesive layer]
In the case where the molding resin layer 4 is provided on the laminate 10, the back surface adhesive layer (not shown) is provided with the first design layer 21 for the purpose of enhancing the adhesion to the molding resin layer 4 when the laminate 10 is molded. This is a layer provided as needed on the second main surface 12 side of the transparent backer layer 3 (or the like).

  For the back surface adhesive layer, a thermoplastic resin or a curable resin is used depending on the type of the molding resin layer 4 used for the laminate 10.

  Examples of the thermoplastic resin used for forming the back surface adhesive layer include acrylic resin, acrylic-modified polyolefin resin, chlorinated polyolefin resin, vinyl chloride / vinyl acetate copolymer, thermoplastic urethane resin, thermoplastic polyester resin, and polyamide. Resin, rubber-based resin, and the like. One of these thermoplastic resins may be used alone, or two or more thereof may be used in combination.

  In addition, examples of the thermosetting resin used for forming the back surface adhesive layer include a urethane resin and an epoxy resin. One of these thermosetting resins may be used alone, or two or more thereof may be used in combination.

  The thickness of the back surface adhesive layer is not particularly limited as long as the molded resin layer 4 can be bonded, and for example, about 10 to 50 μm.

[Molding resin layer 4]
In the laminate 10 of the present invention, the transparent molding resin layer 4 may be integrally formed on the second main surface 12 side of the first design layer 21 (or the transparent backer layer 3 or the like). That is, as shown in FIG. 6, the laminate 10 of the present invention includes at least the molding resin layer 4, the first design layer 21, the second design layer 22, and the transparent base material layer 1 in this order. The transparent base material layer 1 may be formed of a laminate, and the surface of the transparent base material layer 1 on the side of the second design layer 22 may be provided with an uneven shape. Like the transparent base material layer 1 and the transparent backer layer 3, the molding resin layer 4 is transparent to the extent that light from the light source can be transmitted when the light source 30 is disposed on the second main surface 12 side. That is, the molding resin layer 4 is generally transparent (colorless and transparent, colored and transparent, and translucent), and is based on the first design layer 21 when the laminate 10 of the present invention is observed from the first main surface 11 side. It may be colored as long as the design is visible. For example, the molding resin layer 4 may include a matting agent such as silica or a coloring agent. As the coloring agent, the coloring agents exemplified in the second design layer 22 can be used.

  The molding resin layer 4 can be made of a transparent resin or the like. It is preferable that the transparent resin is formed of a transparent thermoplastic resin. The transparent thermoplastic resin is not particularly limited, but is a transparent acrylonitrile-butadiene-styrene resin (hereinafter sometimes referred to as “ABS resin”), an acrylic resin; a polyolefin-based resin such as polypropylene and polyethylene; a polycarbonate resin; Vinyl chloride resin; polyethylene terephthalate (PET) resin; acrylonitrile-styrene-acrylate resin, and the like. Among these, the molding resin layer 4 is preferably formed of a polycarbonate resin because of its excellent transparency. The resin forming the transparent base material layer 1 may be one type or two or more types. Further, examples of the shape of the molded resin layer 4 include a plate-like body and a molded body.

  The laminate 10 including the molding resin layer 4 is manufactured by laminating using a known method such that the surface on the first design layer 21 (or the transparent backer layer 3 or the like) side faces the molding resin layer 4. You. When the molding resin layer 4 is a resin molding, it may be manufactured by an injection molding method such as an insert molding method.

  In the insert molding method, first, in a vacuum molding step, the laminated body before laminating the molding resin layer 4 (that is, at least the transparent backer layer 3 provided as necessary in order from the second main surface 12 side, The laminate including the design layer 21, the second design layer 22, and the transparent base material layer 1) is previously vacuum-formed (off-line preforming) into a molded product surface shape by a vacuum forming die, and then extra if necessary. Trimmed to obtain a molded sheet. This molded sheet is inserted into an injection mold, the injection mold is clamped, and a resin in a fluid state is injected into the mold from the transparent base material layer 1 side of the laminate and solidified. By integrating the molded sheet on the outer surface of the molded product, the laminate 10 including the molded resin layer 4 is manufactured.

More specifically, the laminate 10 including the molding resin layer 4 is manufactured by an insert molding method including the following steps.
A vacuum forming step of previously forming the laminate before laminating the molding resin layer 4 into a three-dimensional shape using a vacuum mold, a trimming step of trimming an excess portion of the vacuum-formed laminate to obtain a molded sheet, and a molded sheet Is inserted into an injection mold, the injection mold is closed, and a resin in a flowing state is injected into the injection mold from the transparent base material layer 1 side to integrate the resin and the molded sheet.

  In the vacuum forming step in the insert forming method, the laminate may be heated to be formed. The heating temperature at this time is not particularly limited, and may be appropriately selected depending on the type of the resin constituting the laminate, the thickness of the laminate, and the like, and can be usually about 120 ° C to 200 ° C. In addition, in the integration step, the temperature of the resin in a fluidized state is not particularly limited, but can be generally about 180 ° C to 320 ° C.

  The molding resin layer 4 may be formed by selecting a resin according to the application as described above. The molding resin forming the molding resin layer 4 may be the above-mentioned thermoplastic resin or a thermosetting resin.

  Examples of the thermosetting resin include a urethane resin and an epoxy resin. One of these thermosetting resins may be used alone, or two or more thereof may be used in combination.

  The laminated body 10 of the present invention exhibits different designs when the light source is turned on and when the light source is turned off. Therefore, when used in combination with a light source, for example, an interior material or an exterior material of a vehicle such as an automobile; a window frame, a door frame It can be used as an interior material of a building such as a wall, a floor, a ceiling, etc .; a housing of home electric appliances such as a television receiver and an air conditioner;

[Decorative articles]
The decorative article 20 of the present invention utilizes the laminate 10 of the present invention, and includes the laminate 10 and the light source 30. As shown in FIG. 6, the light source 30 is arranged on the second main surface 12 side of the multilayer body 10. The details of the laminate 10 of the present invention are as described above.

  The type of the light source is not particularly limited, and examples thereof include a light emitting diode (LED) bulb, an incandescent bulb, a fluorescent lamp, and natural light.

  The decorative article of the present invention exhibits different designs when the light source is turned on and when the light source is turned off. For example, interior or exterior materials of vehicles such as automobiles; fittings such as window frames and door frames; walls and floors; It can be used as an interior material of a building such as a ceiling; a housing of home electric appliances such as a television receiver and an air conditioner;

  Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the examples.

[Manufacture of laminated body]
<Example 1>
A laminate (decorative sheet) was manufactured by the following procedure. On the back surface of a transparent base material layer made of a 150 μm thick non-colored transparent acrylic resin sheet containing polymethyl methacrylate as a main component, as a second design layer, a polybutyl methacrylate / vinyl chloride-vinyl acetate copolymer is used. A black solid layer (1 μm in thickness) was formed. Next, as a first design layer, a stripe-like design layer made of polybutyl methacrylate / vinyl chloride-vinyl acetate copolymer was printed. Subsequently, embossing was performed on the first design layer using a carbon-colored embossing plate having a plate depth of 30 μm to form an uneven shape. Lastly, a transparent backer layer (ABS resin) having a thickness of 300 μm was attached to the surface side on which the uneven shape was formed, thereby forming a decorative sheet.

  Next, the obtained decorative sheet was arranged in a vacuum forming machine (“VPF-T1” manufactured by Fuse Vacuum Co., Ltd.) and heated by a heater until the surface temperature reached 160 ° C. to perform vacuum forming. After taking out the vacuum molded product and trimming it, the support film layer side and the molding resin were integrated by insert molding to obtain a decorative resin molded product. As the molding resin, a transparent polycarbonate resin was used.

<Comparative Example 1>
In the manufacture of the decorative sheet of Example 1, a decorative sheet and a decorative resin molded product were manufactured in the same manner as in Example 1 except that embossing was not performed.

[Evaluation of design quality when light is turned off]
The decorative sheet (laminate before molding) obtained above and the decorative resin molded product (after molding) were visually observed from the surface protective layer side (observation surface dimension: 230.4 mm × 135.4 mm), External visual evaluation was performed on a light panel having a correlated color temperature of 5200 (± 300 K) and an average luminance of 1500 ± 300 cd / m ^{2 when} the light was turned off. The design properties when the light was turned off were evaluated according to the following criteria. Table 1 shows the results.
A: Only the design based on the second design layer can be confirmed B: The outline of the design based on the first design and the design based on the second design layer can be confirmed C: The design based on the first design layer is based on the second design layer Can be confirmed by overlapping with the design

[Evaluation of design when lighting]
The decorative sheet (laminate before molding) obtained above and the decorative resin molded product (after molding) were visually observed from the surface protective layer side (observation surface dimension: 230.4 mm × 135.4 mm), Appearance visual evaluation during lighting was performed on a light panel having a correlated color temperature of 5200 (± 300 K) and an average luminance of 1500 ± 300 cd / m ² . The design property during lighting was evaluated according to the following criteria. Table 1 shows the results.
A: A design based on the first design layer can be confirmed C: A design based on the first design layer can be confirmed overlapping with a design based on the second design layer

DESCRIPTION OF SYMBOLS 1 ... Transparent base material layer 21 ... First design layer 22 ... Second design layer 3 ... Transparent backer layer 4 ... Molded resin layer 10 ... Laminated body 11 ... First principal surface 12 ... Second principal surface

Claims (6)

A first main surface disposed on the observer side and a second main surface disposed on the light source side;
A laminated body comprising at least a first design layer, a second design layer, and a transparent base material layer, in order from the second main surface side,
A laminate, wherein a surface of the transparent substrate layer on the side of the second design layer is provided with an uneven shape. The first design layer has a pattern-like design,
The laminate according to claim 1, wherein the second design layer has a monochromatic design over the entire surface.   3. The laminate according to claim 1, further comprising a transparent backer layer on the second main surface side of the first design layer. 4.   The laminate according to any one of claims 1 to 3, wherein the laminate is in a sheet shape.   The laminate according to any one of claims 1 to 4, further comprising a transparent molding resin layer on the second main surface side of the first design layer. A laminate according to any one of claims 1 to 5,
A light source disposed on a second main surface side of the laminate,
A decorative article comprising: