JP4844293B2 - Metallic decorative sheet for thermoforming - Google Patents

Description

  The present invention exhibits a metallic tone with little change in the initial metallic tone even when thermoformed, in order to obtain various metallic molded plastic products used for automobile interior and exterior, furniture, building materials, home appliances, etc. The present invention relates to a metallic decorative sheet for thermoforming.

  2. Description of the Related Art Conventionally, a thermoplastic resin sheet formed by a vacuum / compression molding method or a compression molding method has been used as various plastic molded products such as automobile interiors, furniture, building materials, and home appliances. Many of these thermoplastic resin sheets are colored, but there are also those whose surfaces are decorated in metallic tones. As a sheet whose surface is decorated with a metallic tone, a sheet obtained by laminating and integrating a film provided with a metal vapor deposition layer on one side of a thermoplastic resin sheet is known. For example, in a molded article disclosed in JP-A-10-000735 (Patent Document 1), a metal vapor deposition film in which a metal vapor deposition layer is formed on one side of a transparent thermoplastic resin film by a sputtering method or an ion plating method is used. It is obtained by insert molding with a plastic resin. According to this technique, the metal itself used for vapor deposition exhibits a metallic tone.

  By the way, in recent years, a material having various variations such as a chrome plating tone and a titanium tone has been demanded to exhibit a metallic tone. Here, in order to obtain the required color tone of the metal deposition layer, it is conceivable to select and vapor-deposit a metal in accordance with it, but in that case, depending on the type of metal, there are some that have poor extensibility, and thermoforming Sometimes the thermoplastic resin sheet cannot follow the elongation, causing cracks and cracks in the metal vapor-deposited layer, resulting in a problem that the appearance of the molded product is significantly reduced. As a result, the metal that can be selected is limited, and the resulting metal tone is inferior to the variation.

  On the other hand, Japanese Patent Laid-Open No. 2001-250452 (Patent Document 2) is in the field of films used for key sheets used for pushbutton switches of various portable devices such as mobile communication terminals such as mobile phones and automobile phones. However, the film was designed to obtain various metal tones by specifying the total light transmittance on one side of a transparent film and providing a metal vapor-deposited layer on the back side of each color ink layer. ing. However, after the film applying this technology is thermoformed by compression molding or the like, and pasted to the base resin molded body, the base resin base material becomes a part where the applied ink has become thin without spreading. There is a problem that the resulting molded product is inferior in metallic tone and mirror finish, and the appearance is remarkably deteriorated.

JP-A-10-000735 JP2001250452

  In view of such a problem, the present invention can obtain a metal tone rich in variations in a metal-like decorative sheet obtained by laminating various metal-like metal vapor-deposited films and a thermoplastic resin sheet. An object is to provide a metallic decorative sheet for thermoforming that can maintain a mirror finish.

  The inventor is based on a colored thermoplastic resin sheet, on which a metal vapor deposition layer is provided on one side of a transparent thermoplastic resin film, and a metal vapor deposition film having a specific total light transmittance is laminated. , And find out that it can be a metal-like decorative sheet for thermoforming that can easily obtain a variety of metal tones and maintain an excellent metallic mirror surface even when thermoformed. This has led to the present invention.

  That is, in the invention according to claim 1 of the present invention, a metal vapor deposition film having a metal vapor deposition layer provided on at least one surface of a transparent thermoplastic resin film and having a total light transmittance of 10 to 50% is colored thermoplastic. The gist is a metallic decorative sheet for thermoforming, which is formed by laminating a resin sheet.

At this time, in order to obtain a titanium-like appearance, the total light transmittance of the metal vapor-deposited film is set to 30 to 50%, and the color of the colored thermoplastic resin sheet is L in the L ^* a ^* b ^* color system. ^* It is preferable that the value is 30 or less. (Claim 2)

At this time, in order to obtain a chrome-plated appearance, the total light transmittance of the metal vapor-deposited film is set to 10 to 30%, and the color of the colored thermoplastic resin sheet is L ^* a ^* b ^* color system. The L ^* value is preferably set to 30 or less. (Claim 3)

  According to the present invention, by coloring the thermoplastic resin sheet and setting the total light transmittance of the metal vapor deposition layer in the metal vapor deposition film laminated thereon to 10 to 50%, the metal vapor deposition layer is colored in a semi-transmissive state. The color tone of the formed thermoplastic resin sheet is raised, and various metal tones can be obtained. Thereby, the metallic appearance which is rich in various variations can be easily obtained.

  Moreover, since the thing excellent in spreadability can be selected as a metal vapor-deposited on a metal vapor deposition film, it becomes the thing excellent in thermoformability also about the metal-tone decoration sheet for thermoforming processes laminated | stacked. . The plastic molded product thus obtained can maintain a metallic tone and a mirror finish.

In the invention of claim 2, the total light transmittance of the metal vapor-deposited film is 30 to 50%, and the color of the colored thermoplastic resin sheet is L ^* a ^* b ^* color system and L ^* value is 30 or less. By making it, it can have a titanium-like appearance.

In the invention of claim 3, the total light transmittance of the metal vapor-deposited film is 10 to 30%, and the color of the colored thermoplastic resin sheet is L ^* a ^* b ^* color system and L ^* value is 30 or less. By making it, it can have a chrome-plated appearance.

  Hereinafter, the specific aspect of the metal-tone decoration sheet for thermoforming of this invention is demonstrated according to FIGS.

  FIG. 1 shows a metallized vapor-deposited film 4 in which a metal vapor-deposited layer 1 is laminated on the surface of a transparent thermoplastic resin film 2 by vapor deposition and the total light transmittance is controlled to 10 to 50%. Sectional drawing of the metal tone decoration sheet 6 for thermoforming process laminated | stacked on is shown.

  Also, FIG. 2 shows a metal vapor deposition film in which a metal vapor deposition layer 1 is laminated on the surface of a transparent thermoplastic resin film 2 by vapor deposition, the total light transmittance is controlled to 10 to 50%, and an adhesive layer 3 is laminated on the back surface. 4 is a cross-sectional view of a metallic decorative sheet 6 for thermoforming processing in which 4 is laminated on a colored thermoplastic resin sheet 5.

  Further, FIG. 3 shows a metal in which a metal vapor deposition layer 1 is laminated on the surface of a transparent thermoplastic resin film 2 by vapor deposition, the total light transmittance is controlled to 10 to 50%, and then an adhesive layer 3 is laminated on the metal vapor deposition layer surface. The cross-sectional view of the metallic decorative sheet 6 for thermoforming processing in which the vapor deposition film 4 is laminated on the colored thermoplastic resin sheet 5 is shown.

  As described above, the thermoformable metallic decorative sheet 6 shown in FIGS. 1 to 3 controls the total light transmittance of the metal vapor-deposited film at 10 to 50%, and changes the color of the colored thermoplastic resin sheet 5. The metal color is changed by passing through the metal, and the metal color adjustment for thermoforming with a desired color tone is possible without changing the type of metal deposited and the color printing on the back of the metal vapor deposition layer. A decorative sheet can be obtained more easily. When the total light transmittance of the metal vapor deposition film is less than 10%, the color of the colored thermoplastic resin sheet 5 cannot be visually recognized and a desired color tone cannot be obtained, and leads to generation of cracks during thermoforming, When it exceeds 50%, the metal vapor deposition layer 2 has no specular feeling and the color of the colored thermoplastic resin sheet 5 is excessively transmitted and a desired color tone cannot be obtained.

  Next, materials and methods used in the present invention will be described.

  The colored thermoplastic resin sheet 5 employed in the present invention is a sheet made of a thermoplastic resin, and the thermoplastic resin is not particularly limited, but is easily colored, and has a thermoformability and the like. In view of the above, ABS resin, polyvinyl chloride resin, acrylic resin, polycarbonate / ABS alloy resin and the like are preferable. Although it does not specifically limit as thickness, The thing of thickness 1.0-10.0mm is used suitably.

  Moreover, the metal vapor deposition film 4 employ | adopted by this invention was laminated | stacked by vapor deposition on the transparent thermoplastic resin films 2, such as a polyester-type film, an acrylic film, a polyurethane-type film, and a polyolefin-type film. Further, the adhesive layer 3 is provided on the back surface or the metal deposition surface. Although it does not specifically limit as thickness of the transparent thermoplastic resin film 2, The thing of thickness 1-500 micrometers is used suitably. The term “transparency” as used herein includes not only colorless transparency but also color transparency such as yellow transparency and blue transparency.

  The metal to be deposited is not particularly limited, but aluminum, indium, tin, chromium, zinc, gallium, nickel, silver, gold, and alloys thereof are preferable. Among these, in consideration of the extensibility during molding, indium and tin are preferable.

  Examples of the method for depositing the metal deposition layer 1 on the transparent thermoplastic resin film 2 include vacuum deposition, sputtering, and ion plating, but are not particularly limited.

As the total light transmittance of the metal vapor-deposited film 4 of the present invention, the total light transmittance is 30 to 50% in order to obtain a color tone of titanium, and the color of the thermoplastic resin of the substrate is L ^* a ^* b ^* table. The color system requires an L ^* value of 30 or less. In order to obtain a chrome-plated color tone, the total light transmittance is 10 to 30%, and the color of the thermoplastic resin of the base material is L ^* a ^* b ^* color specification. The system requires an L ^* value of 30 or less. When the color of the thermoplastic resin of the substrate is L ^* a ^* b ^* color system and the L ^* value exceeds 30, the depth of the color tone is lowered, and the color tone of titanium and chrome plating cannot be obtained.

  The metallic decorative sheet 6 for thermoforming according to the present invention is obtained by laminating and integrating the metal vapor-deposited film 4 and the colored thermoplastic resin sheet 5, and as a method thereof, for example, on an extrusion line. After sheeting the thermoplastic resin, a method of directly laminating the metal vapor-deposited film 4 online, a method of laminating off-line using a laminator, a method of heating and pressurizing using a press machine, etc. are adopted. Of course, various methods can be used for lamination as long as heating and pressurization are possible, regardless of these methods. Moreover, the method of laminating only by pressurization can be used by providing an adhesive layer.

  In order to describe the present invention more specifically, examples and comparative examples will be described below.

<Example 1>
As a transparent thermoplastic resin film, indium is vacuum-deposited on the surface of a transparent polyester film having a thickness of 25 μm (trade name “Teflex”, manufactured by Teijin DuPont Films Ltd.) so that the total light transmittance is 10%. A metal vapor-deposited film for thermoforming was prepared by coating an adhesive layer on the back side of the polyester film that was not vapor-deposited.

  This metal-deposited film is overlaid with an ABS resin sheet (trade name “Toughace”, manufactured by Chuchu Plastics Co., Ltd.) with a thickness of 1.0 mm and white so that the metal-deposited layer is on the outside, and laminating machine (manufactured by Taisei Laminator) Was laminated by heating and pressing to obtain a metallic decorative sheet for thermoforming.

<Example 2>
A metal decorative sheet for thermoforming was obtained in the same manner as in Example 1 except that the vacuum deposition was performed so that the total light transmittance of the metal deposited film was 50%.

<Example 3>
A metallic decorative sheet for thermoforming was obtained in the same manner as in Example 1 except that a black L ^* a ^* b ^* color system with an L ^* value of 30 was used as the ABS resin sheet. .

<Example 4>
A metal decorative sheet for thermoforming was obtained in the same manner as in Example 3 except that the vacuum deposition was performed so that the total light transmittance of the metal deposited film was 50%.

<Comparative Example 1>
A metal decorative sheet for thermoforming was obtained in the same manner as in Example 1 except that the vacuum deposition was performed so that the total light transmittance of the metal deposited film was 3%.

<Comparative example 2>
A metal decorative sheet for thermoforming was obtained in the same manner as in Example 1 except that the vacuum deposition was performed so that the total light transmittance of the metal deposited film was 60%.

  The moldability, color tone, and specular feeling were evaluated for the metallic decorative sheets of Examples and Comparative Examples obtained as described above.

<Moldability>
Using a vacuum / pneumatic molding machine (CUPF-1115-PWB, manufactured by Fuse Vacuum Co., Ltd.), with a male mold with a molding expansion ratio of 2 times, after thermoforming at a heater temperature of 450 ° C. and a mold temperature of 50 ° C., visually The presence or absence of cracks was confirmed. The case where the occurrence of cracks was not confirmed was evaluated as ◯, and the case where cracks were generated was evaluated as ×.

<Color tone, specularity>
Visual confirmation was performed before and after molding. Regarding the color tone, a case where a metallic tone and appearance were confirmed was evaluated as “◯”, a case where the appearance was not performed was evaluated as “×”, and a case where the smoothness was confirmed was evaluated as “◯”.

  From the results of Table 1, in Examples 1 to 4, which are metal decorative sheets for thermoforming processing in which a metal vapor deposition film made to have a total light transmittance as in the scope of the present invention is laminated, thermoforming The results show good results for both the metal properties before and after thermoforming, and the mirror finish. On the other hand, Comparative Examples 1 and 2 deviating from the technical scope of the present invention were inferior in thermoformability, metal tone before and after thermoforming, or mirror finish.

It is sectional drawing which shows embodiment of the metal tone decoration sheet for thermoforming of this invention. It is sectional drawing which shows another embodiment of the metallic tone decoration sheet for thermoforming of this invention. It is sectional drawing which shows another embodiment of the metallic tone decoration sheet for thermoforming of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal vapor deposition layer 2 Transparent film 3 Adhesive layer 4 Metal vapor deposition film 5 Colored thermoplastic resin sheet 6 Metal decoration sheet for thermoforming processing

Claims (6)

At least one surface provided with a metal deposition layer, a metal deposition film and the total light transmittance of 10 to 50% Ri Na laminated on colored thermoplastic resin sheet, a metal from the surface deposition of the transparent thermoplastic resin film Layer, thermoplastic resin film, and colored thermoplastic resin sheet are formed in this order, and the metal of the metal deposition layer is selected from indium, tin, chromium, zinc, gallium, nickel, silver, gold, and alloys thereof. A metallic decorative sheet for thermoforming, characterized by being The total light transmittance of the metal vapor-deposited film is set to 30 to 50%, and the color of the colored thermoplastic resin sheet is set to an L ^* value of 30 or less in the L ^* a ^* b ^* color system. The metal decorative sheet for thermoforming according to claim 1. The total light transmittance of the metal vapor-deposited film is 10 to 30%, and the color of the colored thermoplastic resin sheet is L ^* a ^* b ^* color system and the L * value is 30 or less. The metal decorative sheet for thermoforming according to claim 1 or 2 .   The metal decoration sheet for thermoforming according to any one of claims 1 to 3, wherein the metal of the metal vapor-deposited layer is indium or tin.   The metal decorative sheet for thermoforming according to any one of claims 1 to 4, wherein an adhesive layer is formed between the thermoplastic resin film and the colored thermoplastic resin sheet.   The metal decorative sheet for thermoforming according to any one of claims 1 to 5, wherein a thickness of the colored thermoplastic resin sheet is 1.0 mm or more and 10.0 mm or less.

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