JP2011062990A - View angle-dependent decorative sheet and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative sheet providing visual effect different from conventional decorative sheets, and a method for manufacturing the same. <P>SOLUTION: The view angle-dependent decorative sheet 1 is formed by laminating: a laminated sheet 3 having a decorative layer 31 on a base film 30; an intermediate sheet 5 with a patterned print layer 51 formed in a protruded way on a transparent resin layer 50; and a surface sheet 7 having a decorative layer 71 on a surface resin layer 70 so that the decorative layer 31 and the print layer 51, and the transparent resin layer 50 and the decorative layer 71 are in contact with each other. The decorative layer 71 has a light transmissivity, and a surface 31a of the decorative layer 31 on the print layer 51 side is a glossy surface, and recessed parts 35 are formed on the decorative layer 31 corresponding to the protrusions of the print layer 51. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a viewing angle-dependent decorative sheet and a method for producing the same. In particular, the present invention relates to a viewing angle dependent decorative sheet used for forming a molded product having a decorative pattern on the surface and a method for producing the same.

  In recent years, molded articles such as synthetic resin panels having a decorative pattern on the surface have been widely used as exterior bodies of home appliances, building interior materials, and the like. As a method of applying a decorative pattern to the surface of a molded product, there is a method of covering the surface of a resin molded body with a decorative sheet having a decorative layer (see, for example, Patent Documents 1 and 2).

  Patent Document 1 discloses a decorative sheet in which a transparent acrylic resin sheet layer, a pattern printing ink layer, an ABS resin sheet layer, and an ABS resin backer layer are sequentially laminated. In Patent Document 2, a laminated sheet having a base film and a decorative layer formed on one side of the base film, and a surface resin layer having a transparent resin layer and a printed layer formed in an image on one side of the transparent resin layer. A decorative sheet having a decorative layer covered with a surface resin layer is disclosed.

JP 2001-334609 A JP 2007-296848 A

  Incidentally, in recent years, there has been a demand for further diversification of the decorative mode of the molded product.

  Then, an object of this invention is to provide the decorating sheet which gives the visual effect different from the conventional decorating sheet, and its manufacturing method.

  The present invention includes a laminated sheet having a first decorative layer on a base film, an intermediate sheet in which a printed layer patterned on a transparent resin layer protrudes, and a second decorative layer on a surface resin layer. A viewing angle dependent decorative sheet in which a first decorative layer and a printed layer, a transparent resin layer and a second decorative layer are in contact with each other, and the second decorative layer has light transmittance The surface of the 1st decoration layer by the side of a printing layer is a glossy surface, and the viewing angle dependence decoration sheet by which the recessed part is formed in the 1st decoration layer corresponding to protrusion of a printing layer is provided.

  The viewing angle-dependent decoration sheet of the present invention can express various designs that change depending on the viewing angle. The reason why such an effect is obtained is not necessarily clear, but the present inventors speculate as follows.

  In the viewing angle-dependent decorative sheet of the present invention, a concave portion is formed in the first decorative layer corresponding to the protrusion of the printed layer, so that a design having a three-dimensional stereoscopic effect is expressed, and the surface resin A design resulting from the second decorative layer on the layer is expressed. In the state where the second decorative layer is light transmissive and the surface of the first decorative layer on the printed layer side is a glossy surface, such two designs are expressed, so that the two designs are combined. It is guessed. Furthermore, since the first decorative layer and the printed layer, and the transparent resin layer and the second decorative layer are in contact with each other, the transparent resin layer is disposed between the first decorative layer and the second decorative layer, and depends on the viewing angle. The distance between the first decorative layer and the second decorative layer in the viewing angle direction changes according to the change in the angle at which the decorative sheet is viewed. Thereby, it is guessed that the composite aspect of two designs changes and a design changes depending on a viewing angle.

  The thickness of the transparent resin layer is preferably 30 to 500 μm. In this case, more various designs that change depending on the viewing angle can be expressed.

  The present invention also provides a laminated sheet comprising a first decorative layer on a base film, an intermediate sheet on which a patterned printing layer is projected and formed on a transparent resin layer, and a second decorative layer on the surface resin layer A viewing angle-dependent decorative sheet manufacturing method, wherein the first decorative layer and the printed layer, and the transparent resin layer and the second decorative layer are in contact with each other. Provided is a manufacturing method in which the surface of the first decorative layer is a glossy surface, and a concave portion of the first decorative layer corresponding to the protrusion of the printed layer is formed by pressing the printed layer against the first decorative layer during lamination. . In the manufacturing method of the viewing angle dependent decorating sheet of the present invention, various designs that change depending on the viewing angle can be expressed.

  ADVANTAGE OF THE INVENTION According to this invention, the viewing angle dependence decorating sheet which can express the various design which changes depending on a viewing angle, and its manufacturing method can be provided.

It is an end view which shows the viewing angle dependence decorating sheet which concerns on one Embodiment of this invention. It is an end view which shows the manufacturing method of the viewing angle dependence decorating sheet which concerns on one Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments.

  First, with reference to FIG. 1, the decorating sheet (viewing angle dependent decorating sheet) 1 of this embodiment is demonstrated. FIG. 1 is an end view showing a viewing angle dependent decorating sheet according to an embodiment of the present invention. The decorative sheet 1 includes a laminated sheet 3, an intermediate sheet 5, and a top sheet 7.

  The laminated sheet 3 includes a base film 30 and a decoration layer (first decoration layer) 31 formed on one surface of the base film 30. The decorative layer 31 preferably covers the entire surface of the one surface of the base film 30.

  The intermediate sheet 5 includes a transparent resin layer 50 and a printing layer 51 formed by patterning so as to protrude on one surface of the transparent resin layer 50. The one surface of the transparent resin layer 50 has a portion where the printing layer 51 is formed and a portion where the printing layer 51 is not formed.

  The laminated sheet 3 and the intermediate sheet 5 are laminated so that the decorative layer 31 and the printed layer 51 are in contact with each other (inside). The decorative layer 31 has a concave portion 35 corresponding to the protrusion of the printed layer 51, and has an uneven shape. Thereby, the surface by the side of the intermediate sheet 5 in the lamination sheet 3 has comprised uneven | corrugated shape. The printing layer 51 enters the recess 35, and the portion of the transparent resin layer 50 where the printing layer 51 is not formed is in contact with the decorative layer 31.

  The surface sheet 7 includes a surface resin layer 70 and a decoration layer (second decoration layer) 71 formed on one surface of the surface resin layer 70. The decorative layer 71 preferably covers the entire surface of the one surface of the surface resin layer 70. The top sheet 7 is laminated on the intermediate sheet 5 so that the transparent resin layer 50 and the decorative layer 71 are in contact with each other.

  Hereinafter, the laminated sheet 3, the intermediate sheet 5, and the top sheet 7 in the decorative sheet 1 will be described in more detail.

  First, the laminated sheet 3 will be described. A resin film is used as the base film 30 in the laminated sheet 3. The base film 30 is at least one selected from the group consisting of polyolefin, polyester, polycarbonate, polystyrene, AS (acrylonitrile-styrene copolymer) resin, ABS (acrylonitrile-butadiene-styrene copolymer) resin, and polyvinyl chloride. A resin film containing the above resin is preferred. Examples of the polyolefin include highly crystalline ones such as low density or high density polyethylene, polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, and propylene-butene copolymer, and olefin-based thermoplastic elastomers. . As the base film 30, a resin film containing an ABS resin is more preferable.

  The base film 30 may contain a colorant. By using the colorant, the color of the resin molded body covered with the decorative sheet 1 is concealed, and the color of the base film 30 as the base color of the decorative layer 31 can be adjusted.

  The base film 30 may further contain various additives such as a flame retardant, a lubricant, an antioxidant, an ultraviolet absorber, a light stabilizer, and a filler as necessary. Examples of the flame retardant include aluminum hydroxide and magnesium hydroxide. Examples of the ultraviolet absorber include benzotriazole and derivatives thereof, and benzophenone and derivatives thereof. Examples of the light stabilizer include a hindered amine radical scavenger. Examples of the filler include mica, talc, calcium carbonate, barium sulfate, silica, alumina, and kaolinite.

  100-1000 micrometers is preferable and, as for the thickness of the base film 30, 100-500 micrometers is more preferable. The base film 30 may be a composite film composed of a plurality of layers. For example, when the base film 30 is composed of two resin films, they may be directly heat-sealed, or may be laminated with an adhesive layer between the layers. As a method for directly heat-sealing two resin films, a co-extrusion method using a T die is suitable. The adhesive layer is formed from, for example, a two-component polyurethane. When the adhesive layer is used, two resin films are bonded by, for example, a dry lamination method.

  The decorative layer 31 of the laminated sheet 3 is a layer to which a desired design composed of a shape, a pattern, a color, or a combination thereof is applied. The decoration layer 31 has a pattern such as a wood grain pattern, a stone pattern, a cloth pattern, a skin pattern, a geometric figure, a character, a symbol, and a solid pattern, for example. The decorative layer 31 may be formed so as to cover the entire surface of the base film 30, or alternatively, may be formed in an image shape with a desired pattern. In addition, 1-50 micrometers is preferable and, as for the thickness of the decoration layer 31, 1-10 micrometers is more preferable.

  The surface 31a of the decorative layer 31 on the printed layer 51 side is a glossy surface. Specifically, the glossiness of the surface 31a of the decorative layer 31 is preferably 95 or more, and more preferably 100 or more. By setting the gloss level within the above range, it is possible to express more various designs that change depending on the viewing angle. The upper limit of the glossiness is not particularly limited, but is usually about 200. The glossiness in the above range can be obtained by forming the decoration layer 31 using an ink having a target glossiness. In addition, glossiness is a value measured on the conditions prescribed | regulated to JIS-K-7105 using the glossiness meter set to 60 degrees. The decorative layer 31 having a high glossiness can be formed using, for example, a metallic ink containing metal particles.

  The decoration layer 31 is formed by a method of printing ink on the base film 30. Examples of the printing method include gravure printing, offset printing, silk screen printing, and transfer from a transfer sheet. In particular, when the solvent resistance of the base film 30 is low, it is preferable to transfer the decorative layer 31 formed in advance by gravure printing onto another support film to the base film 30.

  The ink printed on the base film 30 may generally contain a pigment or dye, a vehicle, a solvent, an auxiliary agent, or the like, or may contain metal particles. Vehicles include chlorinated polyolefins such as chlorinated polyethylene and chlorinated polypropylene, polyester, polyurethane produced from polyisocyanate and polyol, acrylic resin, vinyl acetate, vinyl chloride, vinyl chloride-vinyl acetate copolymer, cellulose Examples thereof include resins and polyamide resins. These may be used alone or in combination of two or more. The vehicle is preferably at least one selected from the group consisting of polyester, polyurethane, acrylic resin, vinyl acetate, cellulosic resin, and polyamide resin from the viewpoint of low environmental burden.

  Next, the intermediate sheet 5 will be described. The transparent resin layer 50 in the intermediate sheet 5 is a light-transmitting layer that allows the decorative layer 31 to be visually recognized even through the transparent resin layer 50, and is typically a transparent resin film. Specifically, at least one resin selected from the group consisting of polycarbonate resin, acrylic resin, fluororesin (polyvinylidene fluoride, etc.), a mixture of acrylic resin and fluororesin, polyurethane, polyester, polyolefin, and polystyrene resin is used. The resin film containing is mentioned. Among these, an acrylic resin resin film is preferable. The surface of the resin film may be coated with a mat material, or the mat material may be kneaded into the resin film.

  30-500 micrometers is preferable, as for the thickness of the transparent resin layer 50, 40-200 micrometers is more preferable, and 50-100 micrometers is still more preferable. When the thickness of the transparent resin layer 50 is less than 30 μm, the design overlaps and the viewing angle dependency tends to decrease, and when it exceeds 500 μm, the stereoscopic effect tends to decrease.

  A primer layer formed by applying a primer to the transparent resin layer 50 may be provided between the transparent resin layer 50 and the print layer 51. The primer contains, for example, an acrylic resin, a vinyl chloride-vinyl acetate copolymer, a polyurethane resin, and a resin selected from a combination thereof and a solvent. The coated primer is dried to form a primer layer.

  The print layer 51 is preferably colorless and transparent, but may be colored with a color material such as a pigment. The print layer 51 is formed in an image shape with a periodic pattern. Examples of the pattern include a dot pattern and a stripe pattern. Reflecting the pattern of the print layer 51, the recess 35 is formed in the decoration layer 31.

  The glass transition temperature of the printing layer 51 is preferably 75 ° C. or higher. The glass transition temperature of the printing layer 51 is TMA for measuring the temperature change of the mechanical properties of the sample, or differential scanning calorimetry (DSC) for measuring the endotherm and heat generation when the temperature of the sample is changed (JIS-K-). 7121).

  Moreover, 5-20 micrometers is preferable and, as for the thickness of the printing layer 51, 8-15 micrometers is more preferable. By setting the film thickness of the printing layer 51 within the above range, it is possible to express more various designs that change depending on the viewing angle. When the thickness of the printing layer 51 is less than 5 μm, the stereoscopic effect tends to decrease, and when it exceeds 20 μm, the stereoscopic effect tends to decrease.

  When the glass transition temperature of the printing layer 51 is 75 ° C. or higher and / or when the thickness of the printing layer 51 is within the specific range, more various designs that change depending on the viewing angle are expressed. be able to.

  The print layer 51 is preferably a layer made of a photocured product of a photocurable composition. A photocurable composition is a mixture containing a photocurable component and a thermoplastic resin, for example. The photocurable component preferably includes, for example, a photocurable polyurethane and a photocurable polyester, and is a component that is polymerized by light irradiation to generate a crosslinked structure. In this case, adhesion and weather resistance between the intermediate sheet 5 and the laminated sheet 3 are improved.

  As a photocurable polyurethane, the polyurethane which has a photopolymerizable functional group is mentioned, for example. As photocurable polyester, the polyester which has a photopolymerizable functional group is mentioned, for example. Examples of the photopolymerizable functional group include a radical polymerizable unsaturated group such as a (meth) acryloyloxy group, and a cationic polymerizable functional group such as an epoxy group. The “(meth) acryloyloxy group” means an acryloyloxy group and a methacryloyloxy group corresponding to the acryloyloxy group. Similarly, in the following, “(meth) acrylate” means acrylate and the corresponding methacrylate.

  The polyurethane having a photopolymerizable functional group is preferably a urethane (meth) acrylate having two or more (meth) acrylate groups. The urethane (meth) acrylate is obtained, for example, by reacting a hydroxyalkyl (meth) acrylate with a prepolymer having an isocyanate group at the terminal, which is produced by a reaction between a polyisocyanate and a polyol. Polyisocyanates used in this reaction include aromatic diisocyanates such as 2,4-tolylene diisocyanate, xylene diisocyanate and diphenylmethane-4,4′-diisocyanate, and 1,6-hexamethylene diisocyanate, isophorone diisocyanate and hydrogen. Aliphatic or alicyclic isocyanates such as added tolylene diisocyanate may be mentioned. Examples of the polyol include acrylic polyol, polyester polyol, polycarbonate polyol, polyether polyol, and polyurethane polyol. The weight average molecular weight of the urethane (meth) acrylate is preferably 250 to 100,000.

  The polyester having a photopolymerizable functional group is preferably a polyester (meth) acrylate having two or more (meth) acrylate groups. As polyester (meth) acrylate, what introduce | transduced the (meth) acrylate group into the polyester obtained from dicarboxylic acid and diol is mentioned, for example. Examples of the dicarboxylic acid include phthalic anhydride, isophthalic acid, terephthalic acid, succinic anhydride, adipic acid, azelaic acid, sebacic acid, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, tetrabromophthalic anhydride, tetrachlorophthalic anhydride, Examples thereof include at least one selected from heptic anhydride, hymic anhydride, maleic anhydride, fumaric acid, itaconic acid and trimellitic anhydride. Diols include ethylene glycol, propylene glycol, 1,3-butylene glycol, 1,6-hexanediol, diethylene glycol, dipropylene glycol, cyclohexanone-1,2-diol, cyclohexanedimethanol, glycerin, trimethylolethane and trimethylol. There may be mentioned at least one selected from propane. The weight average molecular weight of the polyester (meth) acrylate is preferably 250 to 10,000, and more preferably 500 to 10,000.

  The said weight average molecular weight regarding urethane (meth) acrylate and polyester (meth) acrylate is a standard polystyrene conversion value calculated | required by GPC (Gel Permeation Chromatography) method.

  In the photocurable component, the ratio of polyester to polyurethane is preferably polyester / polyurethane = 90/10 to 5/95 in terms of mass ratio with the total amount being 100, and polyester / polyurethane = 60/40 to More preferably, it is 10/90. When the ratio is within such a numerical range, the balance between adhesion and weather resistance between the intermediate sheet 5 and the laminated sheet 3 is achieved at a particularly high level.

  In addition to the photocurable polyurethane and the photocurable polyester, the photocurable component may further contain a photopolymerizable monomer or prepolymer without departing from the spirit of the present invention. Examples of the photopolymerizable monomer include monofunctional (meth) acrylates such as methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and phenoxyethyl (meth) acrylate, and diethylene glycol di (meth) acrylate and propylene. Multifunctional (such as glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane ethylene oxide tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate and dipentaerythritol hexa (meth) acrylate ( And (meth) acrylate. Examples of the photopolymerizable prepolymer include epoxy (meth) acrylate, melamine (meth) acrylate, triazine (meth) acrylate, and silicone (meth) acrylate.

  The thermoplastic resin in the photocurable composition can be selected from those generally used as a thermoplastic resin constituting a solvent-based ink. Specific examples of the thermoplastic resin include acrylic resin, vinyl chloride-vinyl acetate copolymer, chlorinated polyolefin (such as chlorinated polyethylene and chlorinated polypropylene), polyester, polyurethane formed from polyisocyanate and polyol, vinyl acetate, Examples include vinyl chloride and cellulose resin. Among these, acrylic resins and vinyl chloride-vinyl acetate copolymers are preferable. The said thermoplastic resin is used individually or in combination of 2 or more types.

  The printing layer 51 applies a printing liquid (mixture) made of a photocurable composition onto the transparent resin layer 50, and irradiates the applied printing liquid with light corresponding to the shape to be patterned. It is preferably formed as a printing layer made of a photocured printing liquid. In this case, when the printing liquid contains a photocurable polyurethane, a photocurable polyester, and a thermoplastic resin, the thickness of the printing layer 51 can be easily adjusted, and a desired design can be easily obtained.

  A printing liquid comprising a photocurable composition is typically prepared by mixing an ultraviolet (ionizing radiation) curable ink containing a photocurable component and a solvent-based ink containing a thermoplastic resin and a solvent. .

  When a printing liquid is prepared by mixing an ultraviolet curable ink and a solvent-based ink, the mixing ratio (mass ratio) of the ultraviolet curable ink and the solvent-based ink is determined in a state containing a solvent (the ultraviolet curable ink). ) / (Solvent ink) = 95/5 to 10/90, more preferably 90/10 to 50/50.

  The content of the thermoplastic resin in the solvent-based ink is preferably 1 to 75% by mass based on the mass of the entire solvent-based ink. When the content of the thermoplastic resin is within such a numerical range, the balance between adhesion and weather resistance between the intermediate sheet 5 and the laminated sheet 3 is achieved at a particularly high level. Further, when the content of the thermoplastic resin is larger than 75% by mass, it tends to be difficult to make the thickness of the printing layer 51 within the above preferable range.

  As the solvent contained in the solvent-based ink, those capable of dissolving or dispersing the thermoplastic resin are used. Preferable specific examples of the solvent include esters such as ethyl acetate, ethers such as diethyl ether, ketones such as methyl ethyl ketone, aromatic hydrocarbons such as toluene, and alcohols such as methanol. The content of the solvent is usually about 30 to 90% by mass with respect to the total amount of the thermoplastic resin and the solvent.

  The printing liquid usually contains a photopolymerization initiator. The photopolymerization initiator is appropriately selected from those usually used. When the photopolymerizable functional group in the photocurable component is a radically polymerizable unsaturated group, specific examples of the photopolymerization initiator include acetophenones, benzophenones, thioxanthones, benzoin, and benzoin methyl ethers. . When the photopolymerizable functional group is a cationic polymerizable functional group, specific examples of the photopolymerization initiator include aromatic diazonium salts, aromatic sulfonium salts, aromatic iodonium salts, metallocene compounds, and benzoin sulfonic acid esters. . These photopolymerization initiators are used alone or in combination of two or more. Content of a photoinitiator is about 0.1-10 mass parts with respect to 100 mass parts of photocurable components.

  The application of the printing liquid onto the transparent resin layer 50 is performed by appropriately adopting a printing method that is usually employed. In particular, the printing liquid is preferably printed by screen printing. In the case of screen printing, it becomes easy to increase the film thickness of the printing layer (screen printing layer) 51. Among screen printing, lithographic screen printing and continuous screen printing are preferable in that high production efficiency can be obtained.

  After applying the printing liquid onto the transparent resin layer 50, it is preferable to remove the solvent from the applied printing liquid. The method for removing the solvent from the printing liquid is preferably performed with heating. Examples of the heating means include hot air and infrared rays. The solvent does not necessarily need to be completely removed, and an amount of the solvent that can be formed normally after photocuring may remain.

  The printing liquid applied on the transparent resin layer 50 is typically irradiated with ultraviolet rays for photocuring of the photocurable composition. As the ultraviolet rays, ultraviolet rays having a wavelength range of 190 to 380 nm are usually used. Examples of the ultraviolet light source include an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light, and a metal halide lamp. In addition, after photocuring a photocurable composition by ultraviolet irradiation, you may remove a solvent.

  Next, the top sheet 7 will be described. The surface resin layer 70 in the surface sheet 7 is a transparent resin layer having a light transmission property such that the decoration layer 31 and the decoration layer 71 can be visually recognized even through the surface resin layer 70, and is typically a transparent resin film. is there. Specifically, at least one resin selected from the group consisting of polycarbonate resin, acrylic resin, fluororesin (polyvinylidene fluoride, etc.), a mixture of acrylic resin and fluororesin, polyurethane, polyester, polyolefin, and polystyrene resin is used. The resin film containing is mentioned. Among these, an acrylic resin resin film is preferable.

  The thickness of the surface resin layer 70 is preferably 50 to 500 μm, and more preferably 75 to 150 μm.

  The decoration layer 71 is a layer to which a desired design composed of a shape, a pattern, a color, or a combination thereof is applied. The decoration layer 71 has patterns such as a wood grain pattern, a stone pattern, a cloth pattern, a skin pattern, a geometric figure, characters, symbols, and a solid pattern, for example. The decorative layer 71 may be formed so as to cover the entire surface of the surface resin layer 70, or alternatively, may be formed in an image shape with a desired pattern.

  1-50 micrometers is preferable and, as for the thickness of the decoration layer 71, 1-10 micrometers is more preferable.

  The decorative layer 71 has light transmittance from the viewpoint of obtaining a decorative sheet having viewing angle dependency. Here, “light transmission” means that the decoration layer 31 can be visually confirmed through the decoration layer 71. Similarly to the decoration layer 31, the decoration layer 71 is formed by a method of printing ink on the surface resin layer 70. Examples of the printing method include gravure printing, offset printing, silk screen printing, and transfer from a transfer sheet. In particular, it is preferable to transfer the decoration layer 71 formed in advance on another support film by gravure printing to the surface resin layer 70. The ink printed on the surface resin layer 70 may be the same ink as the decorative layer 31.

  In the decorative sheet 1 of the present embodiment, an adhesive layer may be provided so as to contact the base film 30 in the laminated sheet 3.

  The total thickness of the decorative sheet 1 is preferably 0.2 to 2.0 mm, and more preferably 0.25 to 0.50 mm. The decorative sheet 1 having such a specific thickness has a high degree of freedom in setting conditions during molding or shaping, and has excellent resistance to various processing and handling.

  In the decorative sheet 1 of the present embodiment, by providing the laminated sheet 3, the intermediate sheet 5, and the top sheet 7, various designs that change depending on the viewing angle can be expressed. On the other hand, if the configuration is different from the decorative sheet 1 in that it does not have the intermediate sheet 5 or the surface sheet 7, or if the configuration is different from the decorative sheet 1 in that it does not have the surface resin layer 70 or the printing layer 51, A design that changes depending on the viewing angle cannot be obtained.

  The decorative sheet 1 of the present embodiment is suitably used as the decorative sheet in a molded article such as a panel including a resin molded body and a decorative sheet that covers a part or the entire surface of the resin molded body. Such a molded product is obtained by, for example, a method of integrally molding with a decorative sheet at the time of resin injection molding. As a method of integral molding, there are mainly in-mold molding and insert molding. In in-mold molding, the decorative sheet is shaped into a predetermined shape in a mold, and in this state, resin is injected onto the decorative sheet by injection molding. On the other hand, in insert molding, a pre-shaped decorative sheet is placed in a mold, and the resin is placed on the decorative sheet by injection molding without substantially further shaping the decorative sheet in the mold. Injected into. It is preferable that the said molded article provided with the decorating sheet 1 of this embodiment is formed by insert molding. Although there is no restriction | limiting in particular as a resin molding in the said molded object, For example, the injection molding body of ABS resin is mentioned. In the case of the decorative sheet 1 of the present embodiment, since a decorative pattern that expresses various designs that change depending on the viewing angle is formed in advance on the surface of the decorative sheet 1, the molded sheet has a stable decorative pattern with less unevenness. Goods can be easily obtained.

  Next, with reference to FIG. 2, the manufacturing method of the decorating sheet 1 of this embodiment is demonstrated. FIG. 2 is an end view showing a method for manufacturing a decorative sheet according to an embodiment of the present invention.

  In the manufacturing method of the decorative sheet 1 of the present embodiment, as shown in FIG. 2, the laminated sheet 3 including the decorative layer 31 on the base film 30, and the printed layer 51 patterned on the transparent resin layer 50 is formed to protrude. The intermediate sheet 5 and the surface sheet 7 having the decoration layer 71 on the surface resin layer 70 are laminated so that the decoration layer 31 and the printing layer 51 and the transparent resin layer 50 and the decoration layer 71 are in contact with each other. It has a lamination process to be performed.

  In the above-described lamination, the laminated sheet 3 and the intermediate sheet 5 are bonded together with the printing layer 51 facing the laminated sheet 3 side, and then, on the decorative layer 31 of the laminated sheet 3 by a known thermocompression bonding method such as a double belt press. The intermediate sheet 5 is thermocompression bonded. Further, in the above lamination, after the intermediate sheet 5 and the surface sheet 7 are bonded together with the decorative layer 71 facing the intermediate sheet 5 side, the surface is formed on the transparent resin layer 50 in the intermediate sheet 5 by a known thermocompression bonding method. The sheet 7 is thermocompression bonded. The thermocompression bonding of the laminated sheet 3 and the intermediate sheet 5 and the thermocompression bonding of the intermediate sheet 5 and the top sheet 7 may be performed simultaneously. After the thermocompression bonding of the laminated sheet 3 and the intermediate sheet 5, the topsheet 7 is further thermocompression bonded. Alternatively, the laminated sheet 3 may be further thermocompression bonded after the intermediate sheet 5 and the top sheet 7 are thermocompression bonded.

  In the above-described lamination, the concave portion 35 of the decorative layer 31 corresponding to the protrusion of the printed layer 51 is formed by pressing the printed layer 51 against the decorative layer 31. In this case, the concave portion 35 is formed in the decorative layer 31 to reflect the pattern of the printed layer 51, and the surface of the laminated sheet 3 on the side of the intermediate sheet 5 has an uneven shape.

  EXAMPLES Hereinafter, although an Example explains in full detail this invention, the scope of the present invention is not limited to these Examples.

Example 1
(Preparation of surface sheet)
A transfer sheet in which a decorative layer A of a geometric figure (pattern) formed by gravure printing is formed on the entire surface of one side of a PET film is bonded to an acrylic resin film (thickness 75 μm) as a surface resin layer. To obtain a laminate. Next, the laminate was sandwiched between a metal roll and a rubber roll, and after passing between the rolls, the PET film was peeled off, and the decorative layer A was transferred from the PET film to the acrylic resin film to prepare a surface sheet.

(Preparation of intermediate sheet)
A printing liquid (screen ink) containing a UV curable ink and a solvent-based ink mixed in a mass ratio of 80:20 in a solvent-containing state and containing a photocurable component, a thermoplastic resin, and a solvent. Was prepared. The ratio between the UV curable ink and the solvent-based ink after removal of the solvent was 93: 7.

  As the UV curable ink, an ink containing polyester acrylate and urethane acrylate as photocurable components and 1-hydroxy-cyclohexyl-phenyl-ketone as a photopolymerization initiator was used. As the urethane acrylate, one obtained from 2,4-tolylene diisocyanate and polyester polyol was used. The weight average molecular weight of urethane acrylate was 15000. As the polyester acrylate, one obtained from tetrahydrophthalic anhydride and 1,6-hexanediol was used. The weight average molecular weight of the polyester acrylate was 3000. Polyester acrylate and urethane acrylate were mixed at a mass ratio of 1: 5.

  As the solvent-based ink, an acrylic resin as a thermoplastic resin and a vinyl chloride-vinyl acetate copolymer dissolved in cyclohexanone as a solvent were used. The ratio of the resin component was 31% by mass based on the mass of the entire solvent-based ink.

  The screen ink was printed in a dot pattern (1.0 mm diameter, 1.0 mm interval) on a long acrylic resin film (thickness 75 μm) as a transparent resin layer using a continuous screen printer. The line speed was 10 m / min. After printing, the solvent is removed from the ink by passing it through a drying oven (hot air and IR, 80 ° C.), then UV irradiation (6 kW) is performed to cure the ink, and a dot-pattern print layer is formed on the acrylic film. An intermediate sheet was produced.

(Production of laminated sheet)
A transfer film in which a decorative layer B formed by gravure printing of high-brightness ink (glossiness 110) is formed on the entire surface of one side of a PET film is bonded to an ABS sheet (thickness 150 μm) as a base film To obtain a laminate. Next, the laminate was sandwiched between a metal roll and a rubber roll, the PET film was peeled after passing between the rolls, and the decorative layer B was transferred from the PET film to an ABS sheet to produce a laminate sheet.

(Preparation of decorative sheet)
The laminated sheet on which the decorative layer B is formed and the intermediate sheet on which the printed layer is formed are bonded so that the decorative layer B and the printed layer (UV ink surface) are in contact (inward direction), The top sheet was bonded so that the decorative layer A was in contact with the surface on the transparent resin layer side of the intermediate sheet. And using the double belt press (head temperature 180 degreeC, line speed 5m / min), the lamination sheet, the intermediate sheet, and the surface sheet were integrated by thermocompression bonding, and the decorating sheet was obtained.

(Example 2)
In the production of the intermediate sheet, a decorative sheet was obtained in the same manner as in Example 1 except that a long acrylic resin film (thickness 75 μm) was used as the transparent resin layer.

(Example 3)
In the production of the intermediate sheet, a decorative sheet was obtained in the same manner as in Example 1 except that a long acrylic resin film (thickness: 200 μm) was used as the transparent resin layer.

(Comparative Example 1)
A decorative sheet was obtained in the same manner as in Example 1 except that no intermediate sheet was provided.

(Comparative Example 2)
A decorative sheet was obtained in the same manner as in Example 1 except that the top sheet was not provided.

(Comparative Example 3)
The decorative layer B formed on the ABS sheet is a colored layer (solid layer) of a geometric figure (pattern) formed by gravure printing with an ink having a glossiness of 70, and has no glossy surface Gave a decorative sheet in the same manner as in Example 1.

(Comparative Example 4)
The decorative sheet A is the same as in Example 1 except that the decorative layer A formed on the surface resin layer is a colored layer (solid layer) that is formed by gravure printing of ink and does not have optical transparency. Got.

  The design properties (mixing of two types) of the decorative sheet were evaluated as follows. The evaluation results are shown in Tables 1 and 2.

(Vertical design evaluation)
The decorative sheet obtained as a sample was placed on a table so that the surface sheet was on top. And the sample was visually observed from the perpendicular | vertical (90 degree) direction in the state 1m away from the sample, and the appearance of the surface sheet in a decorating sheet was observed. The vertical design properties were evaluated based on the following criteria.
A: Only the decorative layer A of the top sheet could be confirmed.
B: The decorative layer A of the surface sheet could be clearly confirmed, and the decorative layer B of the laminated sheet was slightly confirmed.
C: The decorative layer A of the top sheet and the decorative layer B of the laminated sheet could be clearly confirmed, and it was confirmed that defects such as distortion occurred in the decorative layers A and B.

(Evaluation of design properties in the 45 ° tilt direction)
The decorative sheet obtained as a sample was placed on a table so that the surface sheet was on top. And the sample was visually observed from the direction inclined 45 degree | times with respect to the perpendicular direction in the state 1 m away from the sample, and the appearance of the surface sheet in a decorating sheet was observed. Based on the following criteria, the designability in the 45-degree tilt direction was evaluated.
A: The decorative layer A of the top sheet and the decorative layer B of the laminated sheet were clearly confirmed.
B: The decorative layer A of the surface sheet could be clearly confirmed, and the decorative layer B of the laminated sheet was slightly confirmed.
C: Only one of the decorative layer A of the top sheet and the decorative layer B of the laminated sheet could be confirmed.

(Evaluation of changes in design properties)
The case where there was a change between the design expressed at the viewpoint in the vertical direction and the design expressed at the viewpoint in the 45-degree tilt direction was set as “A”, and the case where there was no change was set as “C”.

  The decorative sheet according to the present invention is used for decorating the surface of a resin molded body. The decorative sheet according to the present invention can be used in a wide range of industrial fields where a high degree of design is desired. The decorative sheet according to the present invention includes, for example, exterior panels for vehicles, ships or aircraft, building materials, home appliances, furniture, wallpaper, Buddhist altars, Buddhist tools, nameplates, containers, clothing, bags, telephone cards, credit cards, or ICs. It is suitably used in a molded product constituting a card.

  DESCRIPTION OF SYMBOLS 1 ... Decoration sheet (viewing angle dependence decoration sheet), 3 ... Laminated sheet, 5 ... Intermediate sheet, 7 ... Surface sheet, 30 ... Base film, 31 ... Decoration layer (1st decoration layer), 31a ... Decoration layer Surface: 35 ... concave portion, 50 ... transparent resin layer, 51 ... printed layer, 70 ... surface resin layer, 71 ... decorative layer (second decorative layer).

Claims (3)

A laminated sheet having a first decorative layer on a base film, an intermediate sheet in which a printed layer patterned on a transparent resin layer protrudes, and a surface sheet having a second decorative layer on a surface resin layer; The viewing angle-dependent decorative sheet laminated so that the first decorative layer and the printed layer, the transparent resin layer and the second decorative layer are in contact with each other,
The second decorative layer has light permeability,
The viewing angle-dependent decorative sheet, wherein a surface of the first decorative layer on the printed layer side is a glossy surface, and a recess is formed in the first decorative layer corresponding to the protrusion of the printed layer.   The viewing angle dependent decorating sheet according to claim 1, wherein the transparent resin layer has a thickness of 30 to 500 μm. A laminated sheet having a first decorative layer on a base film, an intermediate sheet in which a printed layer patterned on a transparent resin layer protrudes, and a surface sheet having a second decorative layer on a surface resin layer; The first decorative layer and the printed layer, the transparent resin layer and the second decorative layer are laminated such that they are in contact with each other, and the method for producing a viewing angle dependent decorative sheet,
The surface of the first decorative layer on the printed layer side is a glossy surface,
The manufacturing method of forming the recessed part of the said 1st decoration layer corresponding to protrusion of the said printing layer by pressing the said printing layer against the said 1st decoration layer in the said lamination | stacking.

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