JP2011056683A - Decorative sheet, method for manufacturing the same, and decorative article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative sheet suppressing occurrence of interference fringe on the surface of a base body sheet. <P>SOLUTION: The decorative sheet has a transferring layer containing at least a first metal glossy film layer and a second metal glossy film layer formed on the base body sheet. The first metal glossy film layer has light transmissivity, and the surface of the base body side is formed in irregular shape. The second metal glossy film layer has light reflectivity, is provided adjacent to the surface opposite to the base body sheet side of the first metal glossy film layer, the interface with the first metal glossy film layer being flat. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a decorative sheet in which a transfer layer including a metallic gloss film layer is formed on a base sheet, a method for producing the decorative sheet, and a decorative product decorated with the decorative sheet.

  Conventionally, a decorative sheet has been used to decorate (decorate) an article surface. The decorative sheet is a base sheet provided with a transfer layer composed of a release layer, a handle layer, an adhesive layer, and the like. As a method for decorating the surface of an article with a decorative sheet, a transfer method is known. The transfer method is a method in which the decorative sheet is heated and pressed to bring the transfer layer into close contact with the article surface, then the base sheet is peeled off, and only the transfer layer is transferred to the article surface for decoration. In addition, when the article is a resin molded product used for a cellular phone or a personal computer casing, a simultaneous molding and decorating method is known as a method for performing the transfer method more rationally. The simultaneous molding decoration method is to insert a decorative sheet in a mold cavity in a state of being placed in a mold cavity, inject a molten resin into the mold, and then cool appropriately to obtain a resin molded product. At the same time, after the decorative sheet is bonded to the surface of the resin molded product, the base sheet is peeled off to decorate the surface of the resin molded product.

  In recent years, resin molded products used for mobile phones, personal computer housings, and the like have diversified design preferences, and various designs are required. As a decorative sheet that meets the demand, there is a decorative sheet having a metallic gloss film layer. By performing the simultaneous molding decoration method using this decorative sheet, a metallic luster can be imparted to the surface of the resin molded product. Examples of such a decorative sheet include those described in Patent Document 1 (Japanese Patent Laid-Open No. 2002-200700), Patent Document 2 (Japanese Patent Laid-Open No. 2009-6613), and the like.

  In Patent Document 1, in order to improve the adhesion between the base sheet and the metallic glossy film layer, the metallic glossy film layer has a two-layer structure, and the first metallic glossy film layer on the base sheet side is bonded to the base sheet. A decorative sheet made of a metal material that can be easily formed and can form an alloy layer with the second metallic gloss film layer is described.

  In Patent Document 2, two metallic gloss film layers are formed so as not to overlap each other in order to prevent cracks from occurring even in a portion having a large rising shape and to prevent light leakage even when illuminated by a backlight. A decorative sheet is disclosed.

JP 2002-200700 A JP 2009-6613 A

  In the decorative sheet, in order to improve the adhesion between adjacent layers, it is common to provide an anchor layer between them. This anchor layer is usually formed by a printing method such as gravure printing. When the anchor layer is formed by this printing method, the surface of the anchor layer becomes uneven. For this reason, when a metallic luster film layer is formed on the surface of the uneven anchor layer, the interface becomes uneven. That is, the surface of the metallic gloss film layer has an uneven shape.

  When light (visible light) is incident on the uneven surface of the metallic glossy film layer from the anchor layer side to the decorative sheet having such a configuration, the incident light is reflected by the concave and convex portions of the metallic glossy film layer. Is done. At this time, since the optical path length differs between the light reflected by the concave portion and the light reflected by the convex portion, an optical path difference occurs. Due to this optical path difference, the reflected lights interfere with each other at the surface portion of the base sheet, and interference fringes are generated at the surface portion of the base sheet. This interference fringe becomes a cause of deteriorating the beauty of the decorative product decorated by the decorative sheet.

  Accordingly, an object of the present invention is to solve the above-described problem, and to provide a decorative sheet that can suppress the occurrence of interference fringes on the surface portion of the base sheet, a method for manufacturing the decorative sheet, and the decorative sheet It is to provide a decorative product decorated by the above.

In order to achieve the above object, the present invention is configured as follows.
According to the first aspect of the present invention, there is provided a decorative sheet in which a transfer layer including at least a first metallic glossy film layer and a second metallic glossy film layer is formed on a base sheet,
The first metallic glossy film layer has light transmittance, and the surface on the base sheet side is formed in an uneven shape,
The second metallic glossy film layer has light reflectivity and is provided adjacent to a surface of the first metal glossy film layer opposite to the base sheet side, A decorative sheet having a flat interface is provided.

  According to a second aspect of the present invention, there is provided the decorative sheet according to the first aspect, wherein the light transmittance of the first metallic glossy film layer is 5% or more and 70% or less.

  According to the third aspect of the present invention, the first metallic glossy film layer is made of a metal material having a redox potential higher by 0.05 V or more than the metal material constituting the second metal glossy film layer. A decorative sheet according to the first or second aspect is provided.

  According to the fourth aspect of the present invention, the first metallic glossy film layer is made of a metal material having a redox potential higher by 0.1 V or more than the metal material constituting the second metal glossy film layer. A decorative sheet according to the first or second aspect is provided.

  According to a fifth aspect of the present invention, in the third or fourth aspect, an anchor layer made of a resin material containing chlorine is provided on the surface of the first metallic glossy film layer on the base sheet side. Provide the decorative sheet described.

  According to the 6th aspect of this invention, the said 2nd metallic glossy film layer is partially formed on the surface on the opposite side to the said base sheet of the said 1st metallic glossy film layer, the 1st-5th A decorative sheet according to any one of the aspects is provided.

  According to a seventh aspect of the present invention, there is provided the decorative sheet according to any one of the first to fifth aspects, wherein a resist layer is formed on the second metallic gloss film.

  According to the 8th aspect of this invention, the said 1st metallic glossy film layer provides the decorating sheet as described in any one of the 1st-7th aspect which has an island-like structure.

  According to a ninth aspect of the present invention, there is provided the decorative sheet according to the eighth aspect, wherein the first metallic glossy film layer is composed of tin, indium, or zinc.

According to the tenth aspect of the present invention, there is a decorative product decorated with the decorative sheet according to the sixth or seventh aspect,
The first metallic gloss film layer is configured to have an island structure,
Provided is a decorative product in which an antenna is provided so as to face a region of the first metal glossy film layer where the second metal glossy film layer is not provided.

According to an eleventh aspect of the present invention, there is provided a method for producing a decorative sheet in which a transfer layer including at least a first metallic glossy film layer and a second metallic glossy film layer is formed on a base sheet,
While forming the first metallic gloss film layer so as to have a light transmittance and an uneven shape is formed on the surface of the base sheet side,
On the surface of the first metallic glossy film layer opposite to the base sheet, the second metallic glossy film layer has light reflectivity and has a flat interface with the first metallic glossy film layer. Layered,
The manufacturing method of a decorating sheet including this is provided.

According to the twelfth aspect of the present invention, after the second metallic glossy film layer is laminated, a resist layer is partially formed on the second metallic glossy film layer,
Etching the second metallic glossy film layer using an etchant that dissolves only the second metallic glossy film layer;
The manufacturing method of the decorating sheet as described in an 11th aspect is provided.

  According to a thirteenth aspect of the present invention, there is provided the method for producing a decorative sheet according to the eleventh or twelfth aspect, wherein the first and second metallic glossy film layers are formed by simultaneous vapor deposition.

  According to the fourteenth aspect of the present invention, a metal material that dissolves in only one of an acidic or alkaline solution is used as the material of the first metallic glossy film layer, and an amphoteric metal material is used as the material of the second metal glossy film layer. The method for producing a decorative sheet according to the twelfth or thirteenth aspect, in which any one of the acidic or alkaline solution is used as the etching solution.

  According to a fifteenth aspect of the present invention, the first metal gloss film layer is made of aluminum, the second metal gloss film is made of tin, and the etching solution is concentrated nitric acid. The manufacturing method of the decorating sheet as described in an aspect is provided.

  According to the decorative sheet of the present invention, the first metallic glossy film layer has light transmittance, and the second metallic glossy film layer has light reflectivity. Thereby, the light incident on the decorative sheet from the base sheet side is transmitted through the first metal gloss film layer without being reflected by the uneven surface of the first metal gloss film layer, and the second metal gloss film layer Reflected on the surface. Since the surface (the interface) of the second metallic gloss film layer is flat, there is no optical path difference in the light reflected on the surface. Therefore, it is possible to suppress the occurrence of interference fringes on the surface portion of the base sheet.

It is sectional drawing of the decorating sheet concerning 1st Embodiment of this invention. It is an expanded sectional view for demonstrating reflection of the light which injected into the decorating sheet | seat of FIG. 1 from the base sheet side. It is sectional drawing of the decorating sheet concerning 2nd Embodiment of this invention. It is sectional drawing which shows 1 process of the manufacturing method of the 1st and 2nd metallic luster film layer of the decorating sheet of FIG. It is sectional drawing which shows the process of following FIG. 4A. FIG. 4B is a cross-sectional view showing a step that follows FIG. 4B. It is sectional drawing which shows the process of following FIG. 4C. It is sectional drawing which shows the process of following FIG. 4D. It is a flowchart which shows the manufacturing method of the 1st and 2nd metal glossy film layer of the decorating sheet | seat of FIG. It is sectional drawing which shows 1 process of another manufacturing method of the 1st and 2nd metallic luster film layer of the decorating sheet of FIG. It is sectional drawing which shows the process of following FIG. 6A. FIG. 6B is a cross-sectional view showing a step following FIG. 6B. It is sectional drawing which shows the process of following FIG. 6C. It is a flowchart which shows another manufacturing method of the 1st and 2nd metal glossy film layer of the decorating sheet | seat of FIG. It is sectional drawing of the decorating sheet manufactured by forming the contact bonding layer with the resist layer adhering to the 2nd metallic glossy film layer. It is a partially expanded sectional view of the decorative article decorated by the decorative sheet of FIG.

Before continuing the description of the present invention, the same parts are denoted by the same reference numerals in the accompanying drawings.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<< First Embodiment >>
FIG. 1 is a cross-sectional view of a decorative sheet according to the first embodiment of the present invention.

  In FIG. 1, a decorative sheet 1 according to the first embodiment includes a base sheet 2 and a transfer layer 3 laminated on the base sheet 2. The transfer layer 3 is configured by laminating a release layer 11, a handle layer 12, an anchor layer 13, a first metallic glossy film layer 14, a second metallic glossy film layer 15, and an adhesive layer 16 in order. Yes.

  The base sheet 2 is a sheet that supports the transfer layer 3. Examples of the base sheet 2 include resin sheets such as polypropylene resin, polystyrene resin, polyamide resin, polyester resin, acrylic resin, and polyvinyl chloride resin, metal foil such as aluminum foil and copper foil, and glassine paper. Cellulose-based sheets such as coated paper and cellophane, or a composite sheet of these can be used.

  The release layer 11 is a layer for peeling the base sheet 2 from the transfer layer 3. The release layer 11 is a layer that becomes the outermost surface of the decorative product when the base sheet 2 is peeled from the transfer layer 3 after transfer or after simultaneous molding. For this reason, it is preferable that the peeling layer 11 has a hard-coat function. Examples of the material of the release layer 11 include acrylic resin, polyester resin, polyvinyl chloride resin, cellulose resin, rubber resin, polyurethane resin, polyvinyl acetate resin, and vinyl chloride-vinyl acetate. Copolymers such as ethylene-based copolymer resins and ethylene-vinyl acetate copolymer resins can be used. If the release layer 11 requires hardness, a photo-curing resin such as an ultraviolet curable resin, a radiation curable resin such as an electron beam curable resin, or a thermosetting resin may be selected and used. As a method for forming the release layer 11, for example, a coating method such as a gravure coating method, a roll coating method, or a comma coating method, a printing method such as a gravure printing method, a screen printing method, or the like can be used.

  The pattern layer 12 is a layer for expressing a pattern or the like, and is usually formed on the release layer 11 as a print layer. As a material of the pattern layer 12, a resin such as a polyvinyl resin, a polyamide resin, a polyester resin, an acrylic resin, a polyurethane resin, a polyvinyl acetal resin, a polyester urethane resin, a cellulose ester resin, or an alkyd resin is used as a binder. And a color ink containing a pigment or dye of an appropriate color as a colorant can be used. As a method for forming the pattern layer 12, a normal printing method such as a gravure printing method, a screen printing method, or an offset printing method can be used. In order to perform multicolor printing and gradation expression in the pattern layer 12, an offset printing method and a gravure printing method are suitable. When the pattern layer 12 is a single color, a coating method such as a gravure coating method, a roll coating method, or a comma coating method may be used.

  The anchor layer 13 is a layer for improving the adhesion between adjacent layers. The surface 13a of the anchor layer 13 on the first metallic glossy film layer 14 side has an uneven shape. As the material of the anchor layer 13, vinyl chloride-vinyl acetate copolymer resin, urethane, polyester, epoxy resin, polyethylene, or the like can be used. In addition, it is more preferable that a vinyl chloride resin is used as the material of the anchor layer 13. Since vinyl chloride resin has a higher polarity than other resins, it has a good compatibility with metals. As a method for forming the anchor layer 13, a printing method such as a gravure printing method or a screen printing method can be used.

  The first and second metallic gloss film layers 14 and 15 are layers for imparting metallic gloss. The first metallic gloss film layer 14 is formed on the uneven surface 13 a of the anchor layer 13. For this reason, the surface (interface) 14a on the anchor layer 13 side of the first glossy film layer 14 is also uneven.

  Moreover, the 1st metallic glossy film layer 14 is comprised with the metal material so that it may have a light transmittance. Here, the process of forming a metal material with a predetermined thickness is roughly divided into two types. One is a type in which a number of island structures are formed in the initial stage of the formation process, and as the formation process proceeds, these island structures are joined together without gaps to form a layer with a predetermined thickness. . Examples of this type of metal material include tin, indium, and zinc. The other is a type in which a thin layer is formed and a plurality of layers are stacked as the forming process proceeds to form a layer having a predetermined thickness. Examples of this type of metal material include aluminum, chromium, nickel, and the like. When a metal material that forms an island structure such as tin, indium, or zinc is used as the material of the first metal gloss film layer 14, the first metal gloss film layer 14 is formed so as to have an island structure. Thus (that is, by stopping the formation before the island-like structures are combined with each other to form a layer), the first metallic glossy film layer 14 can be configured to have light transmittance. The first metallic glossy film layer 14 thus configured also has radio wave transmission. Further, when a metal material that does not form an island-like structure such as aluminum is used as the material of the first metallic glossy film layer 14, the thickness of the first metallic glossy film layer 13 is reduced (for example, 0. The first metallic glossy film layer 14 can be configured to have light transmittance.

  The second metallic gloss film layer 15 is made of a metal material so as to have light reflectivity. For example, when tin is used as the material of the second metallic gloss film layer 15, the formation process is continued until a number of island structures are bonded to each other to form a layer having a predetermined thickness. The film layer 15 can be configured to have light reflectivity. For example, when aluminum is used as the material of the second metallic glossy film layer 15, the second metallic glossy film layer 15 reflects light by forming the second metallic glossy film layer 15 to have a predetermined thickness or more. It can comprise so that it may have property.

  Further, the second metal gloss film 15 has a flat surface 15a adjacent to the first metal gloss film 14 (interface with the first metal gloss film 14).

  As a method for forming the first and second metallic glossy film layers 14 and 15, methods such as a vacuum deposition method, a sputtering method, an ion plating method, and a plating method can be used. Moreover, although formation of the 1st and 2nd metallic glossy film layers 14 and 15 may be performed separately by the said method, it is preferable to carry out simultaneously using a simultaneous vapor deposition method. Thereby, the man-hour of the manufacturing process of the decorating sheet 1 can be decreased. For example, AAMF-C2280SPBR (product name) manufactured by Shinko Seiki Co., Ltd. can be used as an apparatus for simultaneously depositing the first and second metallic glossy film layers 14 and 15.

  When a resin material containing halogen such as vinyl chloride resin is used as the material of the anchor layer 13 or a resin material having a hydroxyl group or an amine is used, the halogen or the functional group is radicalized by light. It becomes. The radicalized halogen reacts with moisture (humidity) contained in the air to form hydrogen halide or oxo acid, and the radicalized functional group exists in a radical state for a certain time. In this case, the first metallic luster film layer 14 is oxidized and the metallic luster is lost. This problem can be improved by forming the first metallic glossy film layer 14 with a metal material having a redox potential higher by 0.05 V or more, more preferably 0.1 V or more than the metal material of the second metal glossy film layer 15. can do. By configuring in this way, electrons can flow from the second metallic glossy film layer 15 to the first metallic glossy film layer 14, so that the oxidation of the first metallic glossy film layer 14 can be prevented.

  The adhesive layer 16 is a layer for adhering the transfer layer 3 and the transfer object (article surface). As the material of the adhesive layer 16, a heat-sensitive or pressure-sensitive resin suitable for the material of the transfer object can be used as appropriate. For example, when the material of the transfer object is an acrylic resin, an acrylic resin may be used. In addition, when the material of the transferred material is a polyphenylene oxide / polystyrene resin, a polycarbonate resin, a styrene copolymer resin, or a polystyrene blend resin, an acrylic resin, a polystyrene resin, A polyamide resin or the like may be used. Further, when the material of the resin molded product is a polypropylene resin, a chlorinated polyolefin resin, a chlorinated ethylene-vinyl acetate copolymer resin, a cyclized rubber, or a coumarone indene resin may be used. As a method for forming the adhesive layer 16, a coating method such as a gravure coating method, a roll coating method, or a comma coating method, a printing method such as a gravure printing method, and a screen printing method can be used.

  According to the first embodiment of the present invention, the first metallic glossy film layer 14 has light transmittance, and the second metallic glossy film layer 15 has light reflectivity. Thus, the light incident on the decorative sheet 1 from the base sheet 2 side is not reflected by the uneven surface 14a of the first metallic gloss film layer 14 as shown by the dotted line in FIG. As shown by a broken line, the first metallic gloss film layer 14 is transmitted and reflected by the surface 15 a of the second metal gloss film layer 15. Since the surface 15a of the second metallic gloss film layer is flat, no optical path difference L is generated in the light reflected by the surface 15a. Therefore, the occurrence of interference fringes on the surface portion of the base sheet 2 can be suppressed.

  Strictly speaking, depending on the light transmittance of the first metallic glossy film layer 14, some components of the light incident on the decorative sheet 1 are, as shown by dotted lines in FIG. 2, the first metallic glossy film layer. It is reflected by the surface 14a of the 14 uneven shapes. However, other components of the light incident on the decorative sheet 1 are transmitted through the first metallic gloss film 14 and reflected by the surface 15 a of the second metallic gloss film layer 15. Therefore, it can suppress that an interference fringe generate | occur | produces in the surface part of the base sheet 2 rather than before.

  The light transmittance of the first metallic glossy film layer 14 is preferably 5% or more and 70% or less. When the light transmittance of the first metallic glossy film layer 14 is less than 5%, the radio wave transmitting function of the first metallic glossy film layer 14 is impaired. On the other hand, if the light transmittance of the first metallic glossy film layer 14 is greater than 70%, the first metallic glossy film layer 14 becomes almost transparent, and the metallic gloss of the first metallic glossy film layer 14 is impaired.

  In addition, this invention is not limited to the said 1st Embodiment, It can implement in another various aspect. For example, in the above description, the transfer layer 3 is configured to include the release layer 11, the handle layer 12, the anchor layer 13, the first and second metallic glossy film layers 14 and 15, and the adhesive layer 16. However, the present invention is not limited to this. For example, the transfer layer 3 may further include a release layer.

  The release layer is a layer for improving the peelability of the release layer 11 from the base sheet 2. For this reason, what is necessary is just to arrange | position between the base sheet 2 and the peeling layer 11, when providing a release layer. As the material of the release layer, melamine resin release agent, silicone resin release agent, fluororesin release agent, cellulose derivative release agent, urea resin release agent, polyolefin resin release agent, Paraffin-based release agents, composite release agents, and the like can be used. As a method for forming the release layer, a coating method such as a roll coating method or a spray coating method, a gravure printing method, a screen printing method, or the like can be used.

  In the first embodiment, the anchor layer 13 is provided only between the handle layer 12 and the first metallic gloss film layer 14, but the present invention is not limited to this. For example, the anchor layer 13 may be provided between the base sheet 2 and the release layer, between the release layer 11 and the handle layer 12, or between the second metallic gloss film layer 15 and the adhesive layer 16. Good.

<< Second Embodiment >>
FIG. 3 is a cross-sectional view of a decorative sheet according to the second embodiment of the present invention. The decorative sheet 1A of the second embodiment is different from the decorative sheet 1 of the first embodiment in that the second metallic gloss film layer 15A is partially formed on the first metal gloss film layer 14 (pattern formation). ).

  Since the first metallic glossy film layer 14 is light transmissive, the metallic gloss of the portion where the first metallic glossy film layer 14 and the second metallic glossy film layer 15A overlap when viewed from the base sheet 2 side is , Otherwise it is different from the metallic luster. That is, the decorative sheet 1A of the second embodiment has two colors of metallic luster. Therefore, the design can be diversified. In the second embodiment, two metallic glossy film layers are provided, but three or more metallic glossy film layers may be provided. This makes it possible to further diversify the design.

  The first and second metallic glossy film layers 14 and 15A can be formed, for example, by the procedure shown in FIGS. 4A to 4E and FIG. 4A to 4E are cross-sectional views showing a method for manufacturing the first and second metallic glossy film layers 14 and 15A. FIG. 5 is a flowchart showing a method of manufacturing the first and second metallic glossy film layers 14 and 15A. Here, as shown in FIG. 4A, the description is started on the assumption that the release layer 11, the handle layer 12, and the anchor layer 13 are already formed on the base sheet 2.

First, as shown in FIG. 4B, a first metallic glossy film layer 14 is formed on the anchor layer 13 (step S1).
Next, as shown in FIG. 4C, a water-soluble pattern layer 17 is partially formed (pattern formation) on the first metallic glossy film layer 14 (step S2).
Next, as shown in FIG. 4D, a second metallic glossy film layer 15B is formed so as to cover the first metallic glossy film layer 14 and the water-soluble pattern layer 17 (step S3).

  Subsequently, a water washing process is performed (step S4). As a result, as shown in FIG. 4E, the second metal glossy film layer 15Aa formed on the water-soluble pattern layer 17 is removed together with the water-soluble pattern layer 17, and the second metal glossy film layer 15A is replaced with the first metal glossy film layer 15A. It is partially formed on the film layer 14.

  After step S4, the decorative sheet 1A shown in FIG. 3 can be manufactured by forming the adhesive layer 16 so as to cover the first and second metallic glossy film layers 14 and 15A.

  As the metallic material for the metallic gloss film layer, aluminum is preferably used because aluminum has toughness and excellent uniformity. However, aluminum also has the property of being easily corroded (oxidized) by water. For this reason, when using aluminum as a metal material of the 1st or 2nd metallic luster film layer 14 and 15A, the manufacturing method different from the said method which does not require the said water washing process is calculated | required. In the manufacturing method, the water-soluble pattern 17 needs to be formed on the first metallic glossy film layer 14 before the second metallic glossy film layer 15A is formed. The number of man-hours for the manufacturing process of the decorative sheet 1A cannot be reduced.

  Next, a method for manufacturing the decorative sheet 1A that solves the above problem will be described with reference to FIGS. 6A to 6E and FIG. 6A to 6F are cross-sectional views showing a manufacturing method different from the above-described method for manufacturing the first and second metallic glossy film layers 14 and 15A. FIG. 7 is a flowchart showing a manufacturing method different from the above-described method for the first and second metallic glossy film layers 14 and 15A. Here, as shown in FIG. 6A, the description is started on the assumption that the release layer 11, the handle layer 12, and the anchor layer 13 are already formed on the base sheet 2.

  First, as shown in FIG. 6B, first and second metallic glossy film layers 14 and 15Ab are formed on the anchor layer 13 by simultaneous vapor deposition (step S11). The first and second metallic glossy film layers 14 and 15Ab are made of different metal materials.

  Next, as shown in FIG. 6C, a resist layer 18 is partially formed on the second metallic glossy film layer 15Ab (step S12). As a material of the resist layer 18, an epoxy resin, an acrylic resin, a vinyl chloride-vinyl acetate copolymer resin, an ultraviolet curable resin, or the like can be used. As a method of forming the resist layer 18, for example, a coating method such as a roll coating method or a spray coating method, a gravure printing method, a screen printing method, a flexographic printing method, or the like can be used.

  Next, the second metal gloss film layer 15Ab is etched using an etchant that dissolves only the second metal gloss film layer 15Ab (step S13). As a result, as shown in FIG. 6D, the second metallic glossy film layer 15 </ b> A is partially formed on the first metallic glossy film layer 14.

  After step S13, the decorative layer 1A shown in FIG. 3 can be manufactured by removing the resist layer 18 and forming the adhesive layer 16 so as to cover the first and second metallic glossy film layers 14 and 15A. it can. The resist layer 18 does not need to be removed if it does not adversely affect other layers. That is, as in the decorative sheet 1B shown in FIG. 8, the adhesive layer 16 may be formed with the resist layer 18 attached to the second metallic glossy film layer 15A. Thereby, the process of removing the resist layer 18 can be eliminated, and the number of steps in the manufacturing process of the decorative sheet 1B can be reduced.

  In order to dissolve only the second metal gloss film layer 15Ab, for example, aluminum is used as the material of the first metal gloss film layer 14, tin is used as the material of the second metal gloss film layer 15Ab, and the material of the etching solution is used. Concentrated nitric acid may be used. Concentrated nitric acid cannot dissolve aluminum, but can dissolve tin. Therefore, by selecting the materials of the first and second metallic glossy film layers 14 and 15Ab and the etching solution as described above, only the second metallic glossy film layer 15Ab can be dissolved.

  In addition, a metal material that dissolves only in an acidic solution such as chromium or nickel is used as the material of the first metallic gloss film layer 14, and an amphoteric metal such as aluminum, tin, zinc, or lead is used as the material of the second metal gloss film layer 15Ab. Alternatively, an alkaline solution may be used as the etching solution material. In this case, only the second metallic gloss film layer 15Ab, which is an amphoteric metal, can be dissolved by the alkaline solution. Alternatively, a metal material that dissolves only in an alkaline solution may be used as the material of the first metallic gloss film layer 14, an amphoteric metal may be used as the material of the second metal gloss film layer 15Ab, and an acidic solution may be used as the material of the etching solution. . In this case, only the second metallic gloss film layer 15Ab, which is an amphoteric metal, can be dissolved by the acidic solution.

  Further, a metal material having a high redox potential such as gold, silver, or copper is used as the material of the first metallic glossy film layer 14, and a metal material having a low redox potential such as aluminum is used as the material of the second metal glossy film layer 15Ab. It is also possible to use a dilute acid such as dilute hydrochloric acid or dilute sulfuric acid having a weak oxidizing power as the material of the etching solution. Since metals such as gold, silver, and copper having a high oxidation-reduction potential do not dissolve in dilute acid, the second metal gloss film layer can be obtained by using a metal material that dissolves in dilute acid as the material of the second metal gloss film 15Ab. Only 15 Ab can be dissolved.

  In addition, although the combination example of the material for dissolving only 2nd metal glossy film layer 15Ab was mentioned above, this invention is not limited to these combination examples.

  According to the manufacturing method shown in FIGS. 6A to 6D, after the first and second metallic glossy film layers 14 and 15Ab are simultaneously formed, only the second metallic glossy film layer 15Ab is selectively etched. The decorative sheet 1B having two-color metallic luster can be manufactured with a small number of man-hours. In addition, since it is not necessary to perform a water washing step, a metal material having the property of being easily corroded (oxidized) by water, such as aluminum, can be used as the material of the first or second metallic glossy film layers 14 and 15A. .

  As a method for etching only one of the two metallic gloss film layers adjacent to each other, a method of adjusting the etching time is conceivable. However, in the present invention, since the first metallic glossy film layer 14 is configured to have optical transparency, the thickness thereof becomes very thin, for example, about 0.01 μm to 0.1 μm. For this reason, it is quite difficult to adjust only the second metal gloss film layer 15Ab by adjusting the etching time.

  On the other hand, according to the manufacturing method shown in FIGS. 6A to 6D, the materials of the first and second metallic glossy film layers 14 and 15Ab are made different from each other, and only the second metallic glossy film layer 15Ab is selectively etched. Thus, only the second metal gloss film layer 15Ab can be easily etched regardless of the thicknesses of the first and second metal gloss film layers 14 and 15Ab.

  In addition, when decorating the housing | casing of electronic devices provided with antennas, such as a mobile telephone, with the decorating sheet | seat 1A concerning this 2nd Embodiment, a 1st metallic glossy film layer is island-like with metal materials, such as tin and indium. It is preferable to have a structure and to arrange the antenna as shown in FIG. That is, the antenna 21 is provided so as to face the region 14b of the first metal gloss film layer 14 where the second metal gloss film layer 15A is not provided in the decorative sheet 1A attached to the surface of the housing 22. Is preferred. As described above, the first metallic glossy film layer 14 configured to have an island structure with a metal material such as tin or indium has radio wave transmission. Therefore, by arranging the antenna 21 as shown in FIG. 9, the antenna 21 can transmit and receive radio waves.

  Since the decorative sheet and the manufacturing method thereof according to the present invention can suppress the occurrence of interference fringes on the surface portion of the base sheet, articles such as resin molded products used in the casings of mobile phones and personal computers Useful for decorating the surface.

1, 1A, 1B Decorative sheet 2 Base sheet 3 Transfer layer 11 Release layer 12 Handle layer 13 Anchor layer 14 First metal gloss film layer 15, 15A Second metal gloss film layer 16 Adhesive layer 17 Water-soluble pattern layer 18 Resist layer

Claims (15)

A decorative sheet in which a transfer layer including at least a first metallic glossy film layer and a second metallic glossy film layer is formed on a base sheet,
The first metallic glossy film layer has light transmittance, and the surface on the base sheet side is formed in an uneven shape,
The second metallic glossy film layer has light reflectivity and is provided adjacent to a surface of the first metal glossy film layer opposite to the base sheet side, A decorative sheet with a flat interface.   The decorative sheet according to claim 1, wherein the light transmittance of the first metallic glossy film layer is 5% or more and 70% or less.   The decoration according to claim 1 or 2, wherein the first metallic glossy film layer is made of a metal material having a redox potential higher by 0.05 V or more than the metal material constituting the second metal glossy film layer. Sheet.   The decoration according to claim 1 or 2, wherein the first metallic glossy film layer is made of a metal material having a redox potential higher by 0.1 V or more than the metal material constituting the second metal glossy film layer. Sheet.   The decorative sheet according to claim 3 or 4, wherein an anchor layer made of a resin material containing chlorine is provided on a surface of the first metallic glossy film layer on the base sheet side.   6. The additive according to claim 1, wherein the second metallic gloss film layer is partially formed on a surface of the first metal gloss film layer opposite to the base sheet. Decorative sheet.   The decorative sheet according to any one of claims 1 to 5, wherein a resist layer is formed on the second metallic gloss film.   The decorative sheet according to claim 1, wherein the first metallic glossy film layer has an island structure.   The decorative sheet according to claim 8, wherein the first metallic glossy film layer is composed of tin, indium, or zinc. A decorative item decorated with the decorative sheet according to claim 6 or 7,
The first metallic gloss film layer is configured to have an island structure,
A decorative product in which an antenna is provided so as to face a region of the first metal glossy film layer where the second metal glossy film layer is not provided. A method for producing a decorative sheet in which a transfer layer including at least a first metallic glossy film layer and a second metallic glossy film layer is formed on a base sheet,
While forming the first metallic gloss film layer so as to have a light transmittance and an uneven shape is formed on the surface of the base sheet side,
On the surface of the first metallic glossy film layer opposite to the base sheet, the second metallic glossy film layer has light reflectivity and has a flat interface with the first metallic glossy film layer. Layered,
The manufacturing method of a decorating sheet including this. After the second metallic glossy film layer is laminated, a resist layer is partially formed on the second metallic glossy film layer,
Etching the second metallic glossy film layer using an etchant that dissolves only the second metallic glossy film layer;
The manufacturing method of the decorating sheet of Claim 11 containing this.   The said 1st and 2nd metallic luster film layer is a manufacturing method of the decorating sheet of Claim 11 or 12 formed by simultaneous vapor deposition.   As the material of the first metallic glossy film layer, a metal material that dissolves in only one of an acidic or alkaline solution is used. As the material of the second metallic glossy film layer, an amphoteric metal material is used. The method for producing a decorative sheet according to claim 12 or 13, wherein any one of the alkaline solutions is used.   The method for producing a decorative sheet according to claim 12 or 13, wherein aluminum is used as a material of the first metallic gloss film layer, tin is used as a material of the second metal gloss film, and concentrated nitric acid is used as the etching solution. .

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