JP2009066763A - Coat molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coat molding having a deep gloss and a sense of high-class in appearance. <P>SOLUTION: The coat molding comprises a two-color molding at least partially formed of nontransparent resin, and a multi-layer transparent coat having layers with transparent coats with a refractive index of 2.0-2.5 and transparent coats with a refractive index of 1.3-1.55 alternately arranged in a position to cover at least a part of a portion formed with the nontransparent resin out of the surface of the two-color molding. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a film molded body, and more particularly to a film molded body having a deep gloss and a high-class appearance.

Conventionally, as a method of forming a film on the surface of a molded body such as a casing for a mobile phone, a method of spraying paint with an air gun or the like (see, for example, Patent Document 1), or a method of depositing metal (for example, Patent Document 2). Etc.) are used. In the case of a coating film made of paint or a mirror-like film formed by metal deposition, the surface of the coating film is usually visually recognized, and the gloss, color, etc. of the coating surface are recognized as the appearance. Further, when the paint is transparent, the color of the surface of the molded body is directly visually recognized.
JP 2003-103215 A JP 2003-46622 A

  There are several methods for forming and decorating a film on the molded body as described above. For example, while making use of the appearance of the molded body itself of the two-color molded body, the appearance is given a deeper gloss, There was no coating method that would give a sense of quality.

  The present invention has been made in view of the above-described problems, and is characterized by providing a film molded article having a deep gloss and a high-class appearance.

  In order to achieve the above-mentioned object, the present invention provides the following film molded article.

[1] A two-color molded body formed of at least a part of a non-transparent resin, and a position covering at least a part of the surface formed of the non-transparent resin on the surface of the two-color molded body. Moreover, the film molded body provided with the multilayer transparent film which has the layer by which the transparent film with a refractive index of 2.0-2.5 and the transparent film with a refractive index of 1.3-1.55 are arrange | positioned alternately.

  According to the film molded body of the present invention, at least a part of the surface of the two-color molded body formed from the non-transparent resin has a refractive index at a position covering at least a part of the part formed from the non-transparent resin. Since a multi-layer transparent film having a layer in which a transparent film having a refractive index of 1.3 to 1.55 and a transparent film having a refractive index of 1.3 to 1.55 are alternately disposed is disposed, A layer in which a transparent film having a high refractive index and a transparent film having a low refractive index are alternately disposed when light is incident on and reflected from a portion formed from the non-transparent resin through the film. Therefore, the two-color molded product has a deep gloss and a high-quality appearance.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and the ordinary knowledge of those skilled in the art is within the scope of the present invention. Based on the above, it should be understood that design changes, improvements, and the like can be made as appropriate.

  FIG. 1A is a plan view schematically showing a part of a casing for a mobile phone, which is an embodiment of a film molded body of the present invention. 1B is a cross-sectional view taken along the line A-A ′ of FIG. 1A, and FIG. 1C is a cross-sectional view taken along the line B-B ′ of FIG. 1A. The film molded body shown in FIGS. 1A to 1C is a portion located on the back side of the liquid crystal screen in a portion where the liquid crystal screen is mounted in the casing of the mobile phone.

(1) Film molding:
One embodiment of the film molded body of the present invention is a two-color molded body having a two-layer structure in which a non-transparent portion 3 formed from a non-transparent resin and a transparent portion 2 formed from a transparent resin are laminated, A transparent film having a refractive index of 2.0 to 2.5 (hereinafter sometimes referred to as “high refractive index transparent film”) disposed on the surface of the transparent resin side (transparent portion 2) of the two-layer structure. And a film portion 4 formed of a multi-layer transparent film having layers in which a transparent film having a refractive index of 1.3 to 1.55 (hereinafter, also referred to as “low refractive index transparent film”) is alternately arranged; It is equipped with. The film part 4 is disposed on the surface of the transparent part 2 so as to cover the non-transparent part 3 which is a part formed from a non-transparent resin. Here, when “the film part 4 is disposed at a position covering the non-transparent part 3”, the light incident on the film part 4 passes through the film part 4 and the surface of the non-transparent part 3. Means that the coating 4 is disposed at a position where the reflected light from the surface of the non-transparent part 3 is transmitted through the coating 4 and radiated to the outside. Therefore, this is the case where the transparent part 2 is laminated on the non-transparent part 3 and the transparent part 2 is arranged on the surface of the non-transparent part 2 as in the case of being arranged directly on the surface of the non-transparent part 3. Including the case. That is, if the film part 4 is directly disposed on the non-transparent part 3, the light transmitted through the film part 4 reaches (injects) the surface of the non-transparent part 3 and is reflected by the surface of the non-transparent part 3. Light (reflected light) is transmitted to the outside through the coating 4. And when the transparent part 2 is laminated | stacked on the non-transparent part 3 like this embodiment, and the coating | coated part 4 is arrange | positioned on the surface of the transparent part 2, after incident light permeate | transmits the coating | coated part 4 Light that passes through the transparent part 2 and reaches the surface of the non-transparent part 3 (enters) and is reflected by the surface of the non-transparent part 3 (reflected light) passes through the transparent part 2 and then passes through the coating part 4. Radiated to the outside.

  Here, the “non-transparent resin” is a resin that does not transmit light and is a resin having a light transmittance of 0 to 20%. Further, the “transparent resin” is a resin that transmits light, and is a resin having a light transmittance of 70 to 100%. The light transmittance is a value measured with a spectrophotometer.

  Thus, the film molded body of the present embodiment has a high refractive index transparent film at a position covering at least a part of the surface of the two-color molded body (non-transparent part 3) formed from the non-transparent resin. Since the multi-layer transparent coating (coating portion 4) having layers in which the low refractive index transparent coating and the low refractive index transparent coating are alternately arranged, the incident light to the non-transparent portion 3 and the reflected light from the non-transparent portion 3 are generated. When the film part 4 is transmitted, the two-color molded product has a deep appearance by repeating refraction and reflection by the layer in which the high refractive index transparent coating and the low refractive index transparent coating are alternately arranged. It will have a gloss and luxury.

  In the film molded body of the present embodiment, at least a part of the two-color molded body is formed from a non-transparent resin. This is because the appearance formed by the light reflected from the surface of the non-transparent portion 3 made of non-transparent resin is modified to give a deep gloss and a high-class feeling. The portion formed from the non-transparent resin may be the entire two-color molded body (both the two types of resins are non-transparent) or may be a part of the two-color molded body. In addition, the coating portion 4 may be directly disposed on the surface of the non-transparent portion 3, but as in the present embodiment, the coating portion 4 is disposed on the surface of the transparent portion 2 laminated on the non-transparent portion 3. This is preferable in that an appearance that makes the user feel the depth is obtained.

  The two-color molded body is preferably a mobile phone casing. And it is preferable that the film molded object of this embodiment is what the multilayer transparent film was arrange | positioned by the outer surface of the housing | casing for mobile phones. Mobile phones are required not only to have a telephone function and an e-mail function, but also to have a decorative appearance and a fashionable appearance. Therefore, the decorativeness is improved by two-color molding, and further, a multi-layer transparent having a layer in which a high refractive index transparent coating and a low refractive index transparent coating are alternately arranged on the outer surface of a mobile phone casing By disposing the coating film, it is preferable to give a deep gloss and a high-class feeling in appearance. Here, the outer surface of the cellular phone casing is a surface visually recognized from the outside of the cellular phone. In the film molded body 1 of the present embodiment, the film portion 4 is disposed at a position that forms the outer surface of a portion of the casing of the mobile phone that is located on the back side with respect to the liquid crystal screen. .

  Although the material of the non-transparent part 3 of a two-color molded object will not be specifically limited if it is resin which does not permeate | transmit the said light, The mixture of ABS resin, ABS resin, and polycarbonate resin etc. are preferable. Among these, ABS resin is more preferable. The material of the transparent portion 2 is not particularly limited as long as it is a resin that transmits the light, but an acrylic resin, a polycarbonate resin, or the like is preferable. Among these, acrylic resins are more preferable. Specific examples of the acrylic resin include Acrypet IRK204 manufactured by Mitsubishi Rayon Co., Ltd.

  The color of the non-transparent portion 3 is not particularly limited and can be a desired color. A desired color can be developed in the non-transparent portion 3 by adding a pigment. As the color of the non-transparent portion 3, for example, yellow, pink, purple, gray, black, white and the like are preferable.

  The shape of the film molded body of the present invention is not particularly limited, and can be a shape suited to the application. As in the case of the present embodiment, when the film molded body is a mobile phone casing, the desired shape of the mobile phone casing can be obtained.

  In the film molded body of the present embodiment, the multi-layer transparent film having the layers in which the high refractive index transparent film and the low refractive index transparent film are alternately formed to form the film part 4 is different in two types having different refractive indexes. By laminating the above transparent film, when the incident light to the non-transparent part 3 and the reflected light from the non-transparent part 3 are transmitted through the film part 4, the high refractive index transparent film and the low refractive index transparent film. As a result, the two-color molded product has a deep gloss and a high-quality appearance. In the multilayer transparent coating, the layer in which the high refractive index transparent coating and the low refractive index transparent coating are alternately arranged is preferably 70% or more of the total number of the multilayer transparent coating, and is 100%. More preferably it is. Further, in the case of a multi-layer transparent film, in addition to the layer in which the high refractive index transparent film and the low refractive index transparent film are alternately arranged, the other transparent film is not particularly limited. .

Examples of the material for the transparent coating include inorganic oxides and inorganic fluorides, and among these, inorganic oxides are preferable. Examples of the inorganic oxide include TiO ₂ , SiO ₂ , ZrO ₂ , and Al ₂ O _3. Among these, TiO ₂ is preferable as the high refractive index material, and SiO ₂ is preferable as the low refractive index material. .

  Since the refractive index of the high refractive index transparent film is 2.0 to 2.5 and the refractive index of the low refractive index transparent film is 1.3 to 1.55, the high refractive index transparent film and the low refractive index transparent film The two-color molded body (film molded body) in which the coating portions 4 having layers alternately arranged with each other can be provided with a deep gloss and a high-grade appearance. The value of the refractive index is described in Lee Masanaka's “Optical Thin Film and Film Formation Technology” (Agne Technical Center) (hereinafter referred to as “Copy 1”) P443-447.

In the present embodiment, the multi-layered transparent film forming the film part 4 is formed by alternately laminating a film formed of TiO ₂ and a film formed of SiO ₂ . A stable transparent film can be formed by forming the film part 4 by laminating a film formed from TiO ₂ and a film formed from SiO ₂ . The refractive index of the film formed from TiO ₂ is 2.2 to 2.5, and the refractive index of the film formed from SiO ₂ is 1.45 to 1.47.

  The multi-layer transparent film having layers in which high-refractive index transparent films and low-refractive index transparent films are alternately arranged is preferably one in which 3 to 15 layers of transparent films are laminated, and 5 to 13 layers are laminated. It is further preferable that By setting it as such a range, the coating-laminate can obtain deeper luster and a high-class feeling in appearance. In addition, since the appearance of the film molded body varies depending on the number of layers to be laminated, it is preferable to select the number of laminated transparent films as appropriate within the above range in order to obtain a desired appearance.

  It is preferable that the multilayer transparent coating film forming the coating film portion 4 is disposed on the surface of the two-color molded body by vacuum deposition. By disposing on the surface of the two-color molded body using vacuum deposition, it is easy to form a multi-layer transparent film having a layer in which a high refractive index transparent film and a low refractive index transparent film are alternately arranged. Can do.

  The thickness of the transparent film forming the film part 4 is preferably 10 to 1000 nm, and more preferably 400 to 500 nm. If the thickness is less than 10 nm, the distance that the light travels in the transparent film is shortened and the light is not sufficiently refracted, so that the coating laminate cannot obtain a deep gloss and high-quality appearance. is there. On the other hand, if it is thicker than 1000 nm, the deposition time may be long.

  The light transmittance of the coating portion 4 is preferably 40 to 70%, and more preferably 50 to 60%. If it is less than 40%, the amount of transmitted light is too small, and if it is greater than 70%, the amount of transmitted light is too large, so that it may not be possible to obtain a deep gloss and high-quality appearance. . It is preferable that the light transmittance of the transparent film constituting the film portion 4 is within a range in which the light transmittance of the film portion 4 can be within the above range. For example, when five layers of transparent coatings are laminated, the light transmittance of each transparent coating is preferably 40 to 60%.

  In the film molded body of the present embodiment, in order to improve the adhesion between the two-color molded body and the film portion 4, an undercoat is applied to the surface of the two-color molded body (transparent portion 2), and the film portion 4 is formed on the surface. Is preferably disposed. Examples of the undercoat include a UV (ultraviolet) irradiation cured undercoat film. The undercoat preferably has good light transmission, and the light transmittance is preferably 90 to 100%. The thickness of the undercoat is preferably 6 to 15 μm. If it is too thin, it may be difficult to achieve the effect of improving the adhesion between the two-color molded article and the coating portion 4, and if it is too thick, a problem of film peeling may occur. The undercoat is preferably provided by vacuum deposition.

  In the film molded body of this embodiment, it is preferable to apply a hard coat to the surface of the film part 4 in order to protect the transparent film. The material for the hard coat is preferably a hard material for protecting the transparent film, and examples thereof include a UV (ultraviolet) irradiation-cured top coat film. The hard coat preferably has good light transmission, and the light transmittance is preferably 90 to 100%. Moreover, it is preferable that the thickness of a hard coat is 8-12 micrometers. If it is too thin, it may be difficult to achieve the effect of protecting the transparent film, and if it is too thick, cracks may be generated in the deposited film. The hard coat is preferably provided by vacuum deposition.

(2) Manufacturing method of film molded body:
The method for producing the film molded body of the present invention is not particularly limited. For example, the film molded body 1 of the present embodiment is preferably produced by the following method.

(2-1) Production of a two-color molded article;
By two-color molding, a two-color molded body composed of the transparent portion 2 and the non-transparent portion 3 is obtained. The method of two-color molding is not particularly limited, and a known method can be used. For example, using a two-color injection molding machine, a non-transparent resin is injection-molded into a predetermined mold, and then a transparent resin is injection-molded. And after cooling a metal mold | die, it opens and takes out a molded object. Thereby, the two-color molded object which consists of the non-transparent part 3 and the transparent part 2 shown to FIG. 1A-FIG. 1C is obtained.

  It is preferable that the material and other conditions of the transparent part 2 and the non-transparent part 3 constituting the two-color molded body are those mentioned in the description of the film molded body of the present embodiment.

(2-2) Formation of a coating part;
A multilayer transparent coating (coating portion 4) is formed on the surface of the transparent portion 2 of the obtained two-color molded product by vacuum deposition to obtain the coating molded product 1 of the present embodiment. The method of vacuum vapor deposition is not specifically limited, A well-known method can be used. For example, it is preferable to use the electron beam evaporation method described in P282 to P285 of Work 1, for example.

  It is preferable that each condition about the coating film part 4 and a transparent film shall be mentioned in description of the film molding of this embodiment.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

Example 1
(Two-color molding production)
A two-color molded body formed of a transparent portion 2 and a non-transparent portion 3 constituting the film molded body 1 schematically shown in FIGS. 1A to 1C was produced. Two-color molding was performed using Sumitomo Heavy Industries, Ltd., trade name: SE130D-CI, with the raw material of the transparent part 2 being an acrylic resin and the raw material of the non-transparent part 3 being an ABS resin. As the acrylic resin, Acrypet IPK204 manufactured by Mitsubishi Rayon Co., Ltd. was used. SB7440UX manufactured by Sumitomo Dow was used as the ABS resin. The size of the two-color molded product was 5 cm × 9 cm × 1.5 mm (the thickness of the central plane portion excluding the outer edge portion). The two-color molding conditions are: mold temperature 80 ° C., acrylic resin temperature 260 ° C., ABS resin temperature 240 ° C., acrylic resin is molded at a speed of 60 mm / second, and ABS resin is molded at a speed of 260 mm / second. went.

(Transparent film formation)
A multilayer transparent film (coating part 4) was formed on the surface of the transparent part 2 of the obtained two-color molded article by vacuum deposition, and a film molding 1 schematically shown in FIGS. 1A to 1C was produced. The transparent film is formed of 5 layers (TiO ₂ : 3 layers, SiO ₂ : 2 layers) in the order of TiO ₂ , SiO ₂ and TiO ₂ from the transparent part 2 side, and the film thickness of each transparent film is from the transparent part 2 side. In order, the first layer TiO ₂ : 15 nm, the second layer SiO ₂ : 216 nm, the third layer TiO ₂ : 60 nm, the fourth layer SiO ₂ : 108 nm, and the fifth layer TiO ₂ : 60 nm. Vacuum deposition was performed using an electron beam deposition apparatus manufactured by Showa Vacuum.

  When the obtained molded film was visually observed from the transparent part 2 side, it had a deep luster and a high-grade appearance.

(Comparative Example 1)
A film molded body was produced in the same manner as in Example 1 except that the material forming the portion corresponding to the non-transparent portion 3 was made of a transparent acrylic resin and the portion corresponding to the non-transparent portion was made transparent. When the obtained molded film was visually observed from the transparent part 2 side, it was transparent as a whole, and a large change in appearance could not be obtained.

  The film molded body according to the present invention can be suitably used as a two-color molded body such as a cellular phone casing with improved decorativeness.

It is the top view which showed typically a part of housing | casing for mobile phones which is one Embodiment of the film molding of this invention. It is A-A 'sectional drawing of FIG. 1A. It is B-B 'sectional drawing of FIG. 1A.

Explanation of symbols

1: Coating molded body, 2: Transparent part, 3: Non-transparent part, 4: Coating part.

Claims (1)

A two-color molded body formed of at least a part of a non-transparent resin;
A transparent film having a refractive index of 2.0 to 2.5 and a refractive index of 1.3 disposed at a position covering at least a part of the surface of the two-color molded body formed from the non-transparent resin. A film molded body comprising a multilayer transparent film having layers in which transparent films of ˜1.55 are alternately arranged.

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