JP2009073008A - Plastic molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic molded product which features its simplified manufacturing process and resultant cost saving, and ultimately obtained designability due to the enhanced feel of integration between an enclosure and an electrode member. <P>SOLUTION: This plastic molded product is manufactured by injection-molding a thermoelastic plastic material into a cavity of a molding die. In addition, this manufacturing method comprises a process to arrange a transparent conducting film with a transparent conducting thin film formed at least, on one side of a transparent base material film, and a process to inject a thermoplastic plastic into a cavity of the molding die. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a plastic molded article comprising a transparent conductive film useful as a touch panel member, an electromagnetic wave shielding member, a building material, a portable game machine member, an automobile member, a vehicle member, a household appliance member, a mobile phone member, a personal computer member, and a car navigation member. And a manufacturing method thereof.

  In recent years, electric appliances having a display such as a portable game machine, a mobile phone, and an apparatus operation panel have increased in number having a touch panel using a transparent conductive film as an electrode in a display portion, and a simple power switch for building material use A touch panel including an electrode portion using a transparent conductive film is also used for a button or a button. For these exterior members, plastic molded products molded by injection molding are generally used. Usually, an electrode member using a transparent conductive film and a casing member (exterior portion around a switch or a display portion) are used. It is manufactured separately, and is manufactured by attaching a separately manufactured electrode member to the surface of the casing of a switch or display. However, since this method requires many manufacturing process steps and increases manufacturing costs, it is required to simplify the manufacturing process.

JP 2007-12354 A

  In the present invention, it is an object of the present invention to provide a plastic molded product that simplifies the manufacturing process, reduces costs, and enhances the sense of unity between the casing and the electrode member and has design properties.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a method of manufacturing a plastic molded product formed by injecting a thermoplastic material into a cavity of a molding die, and the molding die A step of disposing a transparent conductive film having a transparent conductive thin film on at least one surface of a transparent substrate film inside the cavity of the mold; and a step of injecting a thermoplastic into the cavity of the molding die. It was set as the manufacturing method of the plastic molded product characterized by providing.

  According to a second aspect of the present invention, the step of disposing a transparent conductive film having a transparent conductive thin film on at least one surface of the transparent substrate film inside the cavity of the molding die is a molding die. The transparent conductive film is disposed inside the cavity of the molding die so that the hollow wall surface of the transparent conductive film is in contact with the surface opposite to the transparent conductive film forming surface of the transparent conductive film. Item 1 is a method for producing a plastic molded article.

  According to a third aspect of the present invention, the cavity wall surface of the molding die has a concavo-convex structure, and the transparent conductive film is formed on at least one surface of the transparent substrate film inside the cavity of the molding die. The step of disposing a transparent conductive film having a conductive thin film places the transparent conductive film in the cavity of the molding die so that the transparent conductive film is in contact with the hollow wall surface having the uneven structure of the molding die. 3. The method for producing a plastic molded product according to claim 1, wherein the plastic molding product is a step of arranging.

  According to a fourth aspect of the present invention, there is provided a plastic molded product formed by the manufacturing method according to any one of the first to third aspects.

  The invention according to claim 5 is a plastic molded product formed by the manufacturing method of claim 3, wherein the transparent conductive film is patterned corresponding to the uneven structure of the plastic molded product. .

  According to a sixth aspect of the present invention, there is provided a touch panel comprising the plastic molded product according to the fourth or fifth aspect.

  By using the method for producing a plastic molded article having the above-described configuration, the production process can be simplified and the cost can be reduced. Moreover, by using the plastic molded article having the above-described configuration, there was a sense of unity between the casing made of the thermoplastic material and the electrode member including the transparent conductive thin film, and the plastic molded article with high design could be obtained.

  Hereafter, the manufacturing method of the plastic molded product of this invention is demonstrated. The plastic molded product of the present invention is manufactured by an injection molding machine.

  FIG. 1 shows an explanatory view of the method for producing a plastic molded product of the present invention. In the method for producing a plastic molded product of the present invention shown in FIG. 1, first, a transparent mold having a transparent conductive thin film 22 on one surface of a molding die 1 having a cavity 11 inside and a transparent substrate 21 is provided. A conductive film 2 is prepared (FIG. 1A). Next, the transparent conductive film is disposed in the cavity of the molding die so that the surface of the transparent conductive film 2 on which the transparent conductive thin film 22 is formed and the wall surface of the molding die 1 are in contact with each other. Then, the molding die is closed (FIG. 1B). Next, the thermoplastic material 3 is injected and molded into the molding die (FIG. 1C). Finally, the plastic molded product 4 is taken out from the mold (FIG. 1 (d)). Thus, the plastic molded product of the present invention is manufactured. At this time, the plastic molded product includes a transparent base film 21 and a transparent conductive thin film 22 in this order on the housing 3 made of a thermoplastic material. By using a plastic molded product by the manufacturing method of FIG. 1, the manufacturing process is simplified. In addition, the plastic molded product to be manufactured can be a plastic molded product having a sense of unity between the housing and the electrode member made of the transparent conductive film and having a design.

  FIG. 2 shows an explanatory diagram of a method for producing another embodiment of the plastic molded article of the present invention. In the method for producing a plastic molded product of the present invention shown in FIG. 2, first, a transparent mold having a transparent conductive thin film 22 on one surface of a molding die 1 having a cavity 11 inside and a transparent substrate 21 is provided. A conductive film 2 is prepared (FIG. 2A). Next, the transparent conductive film is transparent inside the cavity of the molding die so that the surface of the transparent conductive film 2 opposite to the surface on which the transparent conductive thin film 22 is formed and the wall surface of the molding die 1 are in contact with each other. An electroconductive film is arrange | positioned and a metal mold | die for shaping | molding is closed (FIG.2 (b)). Next, the thermoplastic material 3 is injected and molded into the molding die (FIG. 2C). Finally, the plastic molded product 4 is taken out from the mold (FIG. 2 (d)). Thus, the plastic molded product of the present invention is manufactured. At this time, the plastic molded product includes the transparent conductive thin film 22 and the transparent base film 21 in this order on the housing 3 made of a thermoplastic material. By using a plastic molded product by the manufacturing method of FIG. 2, the manufacturing process is simplified. In addition, the plastic molded product to be manufactured can be a plastic molded product having a sense of unity between the housing and the electrode member made of the transparent conductive film and having a design. Moreover, the plastic molded article manufactured can function a transparent base film as a surface protection film.

  FIG. 3 shows an explanatory diagram of a manufacturing method of another embodiment of the plastic molded article of the present invention. In the method for producing a plastic molded product of the present invention shown in FIG. 3, first, a transparent conductive thin film 22 is formed on one surface of a molding die having a concavo-convex structure 12 on the wall surface of the cavity 11 and the transparent substrate 21. The transparent conductive film 2 provided with is prepared (FIG. 3A). Next, the transparent conductive film is transparent inside the cavity of the molding die so that the surface on which the transparent conductive thin film 22 of the transparent conductive film 2 is formed and the wall surface including the concavo-convex structure 12 of the molding die 1 are in contact. An electroconductive film is arrange | positioned and a metal mold | die for shaping | molding is closed (FIG.3 (b)). In the present invention, as shown in FIG. 2, the surface of the transparent conductive film 2 opposite to the surface on which the transparent conductive thin film 22 is formed and the wall surface including the concavo-convex structure 12 of the molding die 1 are provided. You may arrange | position a transparent conductive film so that it may contact. Next, the thermoplastic material 3 is injected and molded into the molding die (FIG. 3C). At this time, due to the injected material and the pressure of the molding die, the transparent conductive thin film is broken and patterned in accordance with the irregular shape of the wall surface. Finally, the plastic molded product 4 is taken out from the mold (FIG. 3D). Thus, the plastic molded product of the present invention is manufactured. Depending on the use and design of the touch panel, it is necessary to pattern the transparent conductive film, which is an electrode member, and usually an etching process for patterning the transparent conductive film is required. However, in the present invention, by using the manufacturing method of the present invention as shown in FIG. 3, the transparent conductive film can be patterned very easily without using the etching process, and the manufacturing process is simplified. It becomes.

  By disposing the concavo-convex structure inside the molding die, the transparent conductive film can be patterned in the injection process. The uneven structure provided on the wall surface inside the molding die needs to have a step. The height of the step of the concavo-convex structure is preferably 0.5 mm or more. When the height of the step of the concavo-convex structure is lower than 0.5 mm, the transparent conductive thin film 22 may not be completely broken.

  The transparent conductive film used as the material of the present invention will be described. FIG. 4 shows a schematic cross-sectional view of the transparent conductive film of the present invention. The transparent conductive film 2 of the present invention includes a transparent conductive thin film 22 on a transparent substrate film 21.

  A plastic film can be used as the transparent substrate film. Examples of plastic films include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; polyamides; polyimides; polyarylates; polycarbonates; polyacrylates; Or a stretched film can be used. Also, other highly transparent plastic films can be used. Of these, polyethylene terephthalate is preferably used. The thickness of the transparent substrate film is appropriately selected according to the intended use, and preferably 5 μm or more and 200 μm or less. The transparent substrate may contain a known additive, for example, an ultraviolet absorber, a plasticizer, a lubricant, a colorant, an antioxidant, a flame retardant and the like.

  Next, a transparent conductive thin film is formed on at least one surface of the transparent substrate film. Examples of the transparent conductive thin film forming material include conductive materials such as oxides such as indium oxide, tin oxide, and zinc oxide, or mixed oxides thereof. In particular, a mixed oxide of indium oxide and tin oxide is preferably used. Further, the conductive material can contain additives such as Al, Zr, Ga, Si, and W as required. About the manufacturing method of the transparent conductive thin film of this invention, forming by vacuum film-forming methods, such as sputtering method, a vapor deposition method, an ion plating method, CVD method, is used preferably. Moreover, before forming a transparent conductive thin film, surface treatments, such as an easily bonding process, a plasma process, and a corona treatment, may be given with respect to the transparent base film.

  The characteristics of the transparent conductive thin film of the present invention are not particularly limited, but those having a film thickness of 5 to 40 nm and a surface resistance value of 100 to 1500 Ω / □ are preferably used.

  In the transparent conductive film of the present invention, between the transparent base film 21 and the transparent conductive thin film 22, on the transparent conductive thin film 22, or on the opposite side of the transparent base film 21 from the surface on which the transparent conductive thin film 22 is formed. Other functional thin films and functional layers may be provided on the surface. Moreover, you may provide the transparent conductive thin film 22 on both surfaces of the transparent base film 21. FIG.

  For example, a plurality of ceramic thin film layers may be laminated between the transparent base film 21 and the transparent conductive thin film 22 in order to improve adhesion and optical characteristics. The ceramic here refers to an inorganic compound such as an oxide, sulfide, or fluoride. More specifically, silicon dioxide, titanium oxide, niobium oxide, aluminum oxide, magnesium fluoride, zirconium oxide, cerium oxide, and the like can be given. Practically, silicon dioxide, titanium oxide, etc. are particularly preferably used.

  The thermoplastic material 3 as the material of the present invention will be described. Examples of the thermoplastic material 3 include, but are not limited to, acrylic; polycarbonate (PC); polyethylene terephthalate (PET); polyvinyl chloride (PVC); polypropylene; polystyrene; Is not to be done.

  The plastic molded product of the present invention will be described. FIG. 5 shows a schematic cross-sectional view of the plastic molded product of the present invention. The plastic molded product 4 in FIG. 5 (a) is a plastic molded product manufactured by the manufacturing method shown in FIG. 1, and the transparent conductive thin film 22 and the casing 3 made of a thermoplastic material are formed on the plastic molded product 4. The transparent base film 21 is provided in this order. The plastic molded product 4 in FIG. 5B is a plastic molded product manufactured by the manufacturing method shown in FIG. 2, and a transparent base film 21 is formed on the casing 3 made of a thermoplastic material. The transparent conductive thin film 22 is provided in this order.

  The plastic molded product 4 in FIG. 5 (c) is a plastic molded product manufactured by the manufacturing method shown in FIG. 3, and the transparent conductive thin film 22 is formed on the housing 3 made of a thermoplastic material. The transparent base film 21 is provided in this order, and the transparent conductive film is patterned corresponding to the uneven structure of the plastic molded product. In the plastic molded product 4 of FIG. 5 (d), a transparent base material film 21 and a transparent conductive thin film 22 are provided in this order on the casing 3 made of a thermoplastic material, and the unevenness of the plastic molded product is provided. Corresponding to the structure, the transparent conductive film is patterned.

  Note that the shape of the casing made of the thermoplastic material can be selected from various shapes by changing the shape of the molding die. For example, the outer frame of the touch panel, the outer frame of the display, the outer frame of the portable display, the outer frame of the switch panel, and the like are raised, but not limited thereto.

  In the present invention, since the transparent conductive film that is the electrode member and the casing are formed in a lump, for example, the outer frame of a panel or switch such as a display or a touch panel that is the casing or the frame Can be integrated, and a bezel-less and integrated design with high design can be achieved. On the other hand, in the case of a method in which an electrode member provided with a transparent conductive thin film and a housing are separately manufactured and then the electrode member is incorporated into the housing, it is difficult to make a bezel-less and highly integrated structure.

  Moreover, when it is set as the structure provided with a transparent base film on the surface like FIG.5 (b) and FIG.5 (d), the transparent base film 21 can work | function as a surface protection function. In the plastic molded product shown in FIG. 5, a hard coat layer can be formed for the purpose of improving the scratch resistance of the surface. An ionizing radiation curable material can be suitably used for the hard coat layer, and hard coating performance can be imparted by curing the ionizing radiation curable material with ultraviolet rays or an electron beam.

  The plastic molded product of the present invention can be suitably used as a touch panel member. In particular, it can be suitably used as a capacitively coupled touch panel member. A capacitively coupled touch panel is a position detection method that captures changes in the surface charge of the display panel when touched by a finger. A low-voltage electric field is formed on the entire surface of the touch panel, and the charge of that portion is formed by the touched finger. The capacitive coupling type touch panel that discharges is excellent in durability and transmittance.

  At this time, by using a plastic molded product in which the transparent conductive thin film 22 is patterned as shown in FIGS. 5C and 5D, a capacitive coupling type touch panel having a plurality of channels is obtained. Can do. The surface resistance value of the transparent conductive film 22 used for the electrode of the capacitively coupled touch panel is not particularly limited, but is preferably in the range of 100 to 1500 Ω / □.

Example 1
By using a polyethylene terephthalate film (PET film) having a thickness of 100 μm as a transparent substrate film, ITO, which is a mixed oxide of indium oxide and tin oxide, is formed on one surface of the PET film by a direct current magnetron sputtering method. A transparent conductive thin film was formed. The film thickness of the obtained transparent conductive film was 20 nm, and the surface resistance value was 300Ω / □. The transparent conductive film was produced by the above.

  The transparent conductive film obtained inside the mold cavity of the injection molding machine is placed so that the transparent conductive thin film forming surface is in contact with the cavity wall surface of the molding mold, and a transparent polycarbonate material is injected into the mold. And after cooling, the metal mold | die was removed and the plastic molded product of this invention was obtained. The obtained plastic molded article had a structure with a transparent conductive thin film on the surface, and had a high design.

(Example 2)
Using the transparent conductive film obtained in Example 1, the transparent conductive film obtained inside the mold cavity of the injection molding machine has a mold cavity on the surface opposite to the transparent conductive thin film forming surface. The plastic molded article of the present invention was obtained by placing it in contact with the wall surface, injecting a transparent polycarbonate material into the mold, and removing the mold after cooling. The obtained plastic molded article has a structure having a transparent conductive thin film inside the transparent substrate film, and has a high design.

(Example 3)
Using the transparent conductive film obtained in Example 1, the transparent conductive film obtained in the cavity of the molding die of the injection molding machine is brought into contact with the cavity wall surface of the mold. The plastic molded article of the present invention was obtained by injecting a transparent polycarbonate material into the mold and removing the mold after cooling. At this time, as the molding die, a contact surface with the transparent conductive film having a concavo-convex structure with a step height of 0.5 mm corresponding to the electrode pattern was used. The obtained plastic molded product has a structure with a transparent conductive thin film on the surface, and the transparent conductive thin film is insulated and patterned at the stepped portion of the concavo-convex structure of the mold. It was expensive.

Example 4
Using the transparent conductive film obtained in Example 1, the surface of the transparent conductive film obtained inside the mold cavity of the injection molding machine is the cavity opposite to the surface where the transparent conductive thin film is formed. The plastic molded article of the present invention was obtained by placing it in contact with the wall surface, injecting a transparent polycarbonate material into the mold, and removing the mold after cooling. At this time, as the molding die, a contact surface with the transparent conductive film having a concavo-convex structure with a step height of 0.5 mm corresponding to the electrode pattern was used. The obtained plastic molded product has a structure having a transparent conductive thin film inside the transparent base film, and the transparent conductive thin film is insulated and patterned at the stepped portion of the uneven structure of the mold. Also, the design was high.

FIG. 1 is an explanatory view of a method for producing a plastic molded product of the present invention. FIG. 2 is an explanatory view of a method for producing another embodiment of the plastic molded article of the present invention. FIG. 3 is an explanatory view of a method for producing another embodiment of the plastic molded article of the present invention. FIG. 4 is a schematic cross-sectional view of the transparent conductive film of the present invention. FIG. 5 is a schematic cross-sectional view of the plastic molded product of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold for molding 11 Cavity 2 Transparent conductive film 21 Transparent base film 22 Transparent conductive thin film 3 Case / thermoplastic material 4 Plastic molded product

Claims (6)

A method for producing a plastic molded product molded by injecting a thermoplastic material into a cavity of a molding die,
A step of disposing a transparent conductive film having a transparent conductive thin film on at least one surface of the transparent substrate film inside the cavity of the molding die;
And a step of injecting a thermoplastic into the cavity of the molding die. The step of disposing a transparent conductive film having a transparent conductive thin film on at least one surface of a transparent substrate film inside the cavity of the molding die is transparent to the cavity wall surface of the molding die and the transparent conductive film. The method for producing a plastic molded product according to claim 1, wherein the transparent conductive film is disposed inside the cavity of the molding die so that the surface opposite to the surface on which the conductive film is formed is in contact. The cavity wall surface of the molding die has an uneven structure, and
The step of disposing a transparent conductive film having a transparent conductive thin film on at least one surface of a transparent base film inside the cavity of the molding die includes a cavity wall surface having an uneven structure of the molding die and the transparent The method for producing a plastic molded product according to claim 1 or 2, wherein the transparent conductive film is disposed inside the cavity of the molding die so that the conductive film is in contact therewith.   A plastic molded product, which is molded by the manufacturing method according to any one of claims 1 to 3.   A plastic molded product, which is molded by the manufacturing method according to claim 3, wherein the transparent conductive film is patterned corresponding to the uneven structure of the plastic molded product.   A touch panel comprising the plastic molded product according to claim 4 or 5.

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