JPH10249881A - El luminescence insert molding and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an EL luminescence insert molding having satisfactory durability of an EL luminous unit without leakage or attenuation of LE luminescence. SOLUTION: A character or a symbol is formed by a screen printing method on a base film 1 formed with a transparent conductive film on one surface of a polyethylene terephthalate film, and a fluorescent layer containing zinc sulfide, an insulating layer made of acrylic resin and a back surface electrode containing carbon are sequentially formed to form a design layer having an EL luminescent unit 2. An adhesive layer 4 is formed by screen printing by using polyacrylic resin to cover the entire surface of the design layer to obtain an EL insert film in which the unit 2 becomes a protrusion 7. This EL luminescence insert molding is molded by placing the EL insert film in an injection mold, closing the mold, injecting molding resin in a cavity, thereby integrating an injection molding 6 with the EL insert film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an EL light emitting insert molded article in which a picture layer having an EL light emitting portion is laminated on an injection molded article together with an insert film, and a method of manufacturing the same. The application of the EL light emitting insert molded product of the present invention is a light emitting membrane sheet, a display, an advertising medium,
It is an operation panel or a sheet with a push button.

[0002]

2. Description of the Related Art As a conventional insert molded product, at least a picture layer,
An insert film having a pattern with an adhesive layer laminated thereon is placed in an injection mold, the mold is closed, a transparent molding resin is injected into the cavity, and an insert film having a pattern and a transparent molding are formed simultaneously with the formation of a transparent molded product. Some products are integrally molded with products. In order to emit light from the insert molded product, there is a product manufactured by attaching an EL lamp piece to a part of the back surface (a surface on which no pattern is formed) of the insert molded product via an adhesive.

[0003]

[Problems to be solved by the invention]

(1) In the conventional EL light emitting insert molded product, since the EL lamp piece is externally attached, when the light from the EL lamp piece passes through the transparent molded product, the light is diffused and light leaks to a portion other than a necessary portion. In some cases, light was attenuated, and the design was poor. (2) In the conventional EL light emitting insert molded product, since the EL lamp piece is externally attached, it is easily peeled off or displaced due to contact or friction with peripheral components, resulting in poor durability. (3) Among the conventional EL light emitting insert molded products, the one in which the EL lamp piece is adhered to the through hole of the transparent molded product has a smaller area for attaching the EL lamp piece and the transparent molded product.
The adhesive strength between the EL lamp piece and the transparent molded product was weak, and it was easily peeled off or displaced due to contact or friction with peripheral components, resulting in poor durability.

An object of the present invention is to solve the above-mentioned drawbacks,
An object of the present invention is to provide an EL light emitting insert molded article which has no leakage or attenuation of EL light emission and has good durability of an EL light emitting portion.

[0005]

In order to achieve the above object, an EL light emitting insert molded product according to the present invention comprises a light transmitting base film, a picture layer having at least an EL light emitting portion on one side and an adhesive layer sequentially laminated. The obtained EL insert film was integrally formed on the surface of the injection molded product.

Further, in the EL light emitting insert molded product of the present invention, the injection molded product has a through hole, a portion covering the through hole of the base film protrudes in a direction opposite to the through hole, and a pattern is formed on the protruding portion. The EL light emitting portion of the layer may be represented.

[0007] To achieve the above object, the present invention provides
The method for producing an L light-emitting insert molded product is as follows: a light-transmissive base film is provided with an EL insert film in which a pattern layer having at least an EL light-emitting portion and an adhesive layer are sequentially laminated on one surface of a light-transmitting base film in an injection mold; The injection molding resin was injected into the cavity by closing the cavity, and the EL insert film and the injection molded product were integrally molded simultaneously with the molding of the injection molded product.

[0008] To achieve the above object, the present invention provides
The method for manufacturing the L light emitting insert molded product is as follows: the EL light emitting film is placed in an injection mold, the mold is closed, the molding resin is injected into the cavity, and the EL light emitting film and the injection molded product are formed simultaneously with the injection molded product. Is molded integrally to obtain an EL light-emitting molded product, and then a colored film in which at least a picture layer and an adhesive layer are sequentially laminated on one side of a light-transmitting base film is used as an E.
It was stuck on the L light emitting film.

Further, in the method of manufacturing an EL light emitting insert molded product according to the present invention, the injection molded product has a through hole, and a portion covering the through hole of the EL insert film protrudes on the side opposite to the through hole. It is also possible to manufacture a device in which the EL light emitting portion of the picture layer is expressed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The EL light emitting insert molded product of the present invention comprises an injection molded product 6 having an EL insert film 5 in which a picture layer 3 having at least an EL light emitting portion 2 and an adhesive layer 4 are sequentially laminated on one surface of a light transmissive base film 1. (See FIGS. 1, 2, 7 to 9).

The base film 1 is a light-transmitting resin film, and may be a colorless transparent or colored translucent film. The base film 1 is wound on a roll to be a film roll used as a printing material, and is for printing the picture layer 3 and the like on the surface of the printing material.
The base film 1 includes, for example, a stretched polyester film having a thickness of 25 to 500 μm, a stretched heat-resistant polyethylene film, and the like. When a part of the EL insert film 5 is formed so as to be the projection 7, the base film preferably has a thickness of 100 to 250 μm. The shape of the protruding portion 7 includes a three-dimensional button shape and the like, and also includes a round shape and a square shape. In addition, as the base film, there is a base film that does not easily transmit moisture.

The EL layer 2 of the picture layer 3 has at least
It has a portion where a transparent electrode 8, a phosphor layer 9, an insulating layer 10, and a back electrode 11 are laminated. Examples of the transparent electrode 8 include an ITO conductive film formed by sputtering, ion plating, or the like, and a conductive film formed by printing or coating using a material such as ink in which ITO particles are dispersed in a resin binder. . As the phosphor layer 9, a mixture of zinc sulfide or calcium sulfate and a metal oxide such as copper, manganese, or aluminum, or a material obtained by microencapsulating them is a resin having a high dielectric constant such as a cyanoethyl cellulose resin. There is a layer formed by printing or coating using a material such as ink uniformly dispersed therein. The insulating layer 10 includes a layer formed by printing or coating using a material such as an acrylic resin, a urethane resin, a silicon resin, and an epoxy resin. The back electrode 11 includes a conductive ink film formed by printing or coating. The back electrode 11 may be formed using the same material as the transparent electrode 8 described above. The back electrode 11 is
It is preferable that a black material such as carbon is used so that the light beam from the EL light emitting unit 2 does not escape to the back surface of the insert molded product. The EL light emitting section 2 may be a portion in which the transparent electrode 8, the phosphor layer 9, the insulating layer 10, and the back electrode 11 are laminated by printing, coating, or the like. Alternatively, the EL light emitting unit 2 is formed by integrating the transparent electrode 8, the phosphor layer 9, the insulating layer 10, and the back electrode 11, and is bonded to the light-transmitting base film via the film-side adhesive layer 12. It may be one that can be stacked by stacking.

As the picture layer 3, there is a layer having the EL light emitting portion 2 and the coloring layer 13. The coloring layer 13 is a layer for forming characters, figures, symbols, and the like, and for coloring the entire surface of the injection molded product 6. The coloring layer 13 is formed of a normal translucent pigment ink or a fluorescent coloring ink, a light-shielding pigment ink or a metal-deposited film, a brilliant pigment ink composed of a pearl pigment and a resin binder, a dye ink composed of a dye and a resin binder, and the like. Consists of When the coloring layer 13 is formed so as to overlap the EL light-emitting portion 2, a pattern of a blank character may be formed by using light-shielding ink (see FIG. 2 and the like). The coloring layer 13 may be formed directly on the base film, or may be formed on the surface of the transparent electrode 8 formed on the base film. Coloring layer 13
In order to maintain the adhesiveness between the transparent electrode 8 and the insulating layer 10 stacked on top and bottom, a resin binder having good adhesiveness with them may be appropriately selected.

The adhesive layer 4 is made of a polyvinyl chloride-vinyl acetate copolymer resin, an acrylic resin, a urethane resin, or the like. The adhesive layer 4 is formed by a normal printing method such as an offset printing method, a gravure printing method, a screen printing method, or a coating method such as a roll coating method or a spray coating method. Further, the adhesive layer 4 may be formed of a resin that does not easily transmit moisture.

The back substrate film 14 may be laminated between the back electrode 11 and the adhesive layer 4 if necessary. The back substrate film 14 and the substrate film 1 have an EL
The light emitting unit 2 may be sealed by heat sealing with the light emitting unit 2 sandwiched therebetween. When the back substrate film 14 is used, the back electrode 11 and the insulating layer 1 are formed on the back substrate film 14.
0, the phosphor layer 9, the coloring layer 13, the transparent electrode 8, and the like are formed in this order, and the base film may be finally covered to form the EL insert film 5 (see FIG. 9).

According to the method for manufacturing an EL light emitting insert molded product of the present invention, the EL insert film 5 is placed in an injection mold, the mold is closed, and the molding resin 1 is placed in the cavity 20.
5, the EL insert film 5 and the injection molded product 6 are integrally molded at the same time as the injection molded product 6 is molded.

First, the EL insert film 5 is placed in an injection mold. The EL insert film 5 may have a protrusion 7 on a part of its surface before being placed in an injection mold (see FIGS. 3 and 5). The EL insert film 5 may be placed in the injection mold by a vacuum suction force or a mold closing force so that a part of the surface protrudes after that (see FIGS. 4 and 5). The EL insert film 5 may be configured such that the long EL insert film 5 is once wound around a roll shaft to form a roll, and the EL insert film 5 is continuously fed into the injection mold from the roll. The injection mold includes a fixed mold 17 having a resin injection port 16 and a movable mold 18 and the like.
By closing the mold 8, one or more cavities 20 surrounded by the cavity forming surface 19 of the fixed mold 17 and the movable mold 18 are formed. The fixed mold 17 may have one or a plurality of protrusions 21 for forming a through hole 26 in the injection molded product 6 and forming a protruding portion in the EL insert film 5. The movable die 18 may have one or more concave portions 22 into which the tips of the convex portions 21 of the fixed die 17 fit.
The mounting is performed such that the adhesive layer 4 side of the EL insert film 5 faces the resin injection port 16 of the injection molding die.
The EL insert film is fixed on the parting surface around the cavity forming surface 19 by a clamp member or the like,
The space formed by the EL insert film and the cavity forming surface 19 may be closed. Before closing the mold, the EL insert film 5 may be softened using a heating plate or the like, and may be vacuum-formed so that a part of the surface protrudes by a vacuum suction force.

Next, the mold is closed, the molding resin 15 is injected into the cavity 20, and the EL insert film 5 and the injection molded product 6 are integrally molded simultaneously with the molding of the injection molded product 6 (see FIG. 6). After cooling the injection molded product 6, the mold is opened and E
Take out the L light emitting insert molded product. The EL insert film 5 may be formed so that a part of the surface thereof protrudes by a mold closing force when the mold is closed. Examples of the molding resin 15 include resins such as polypropylene resin, acrylonitrile butadiene styrene resin, polystyrene resin, ethylene vinyl acetate resin, polycarbonate resin, and nylon resin.

As an example of the EL light emitting insert molded product of the present invention, a transparent electrode 8, a colored layer 13, a phosphor layer 9, an insulating layer 10, a back electrode 1
1. EL insert film 5 in which adhesive layer 4 is sequentially laminated
Are integrally formed on the injection-molded product 6, and a pattern is observed from the base film side (see FIG. 7).

As another example of the EL light emitting insert molded product of the present invention, a colored layer 13 having a punched pattern is laminated on one side of a light-transmitting base film,
The film-side adhesive layer 12 and E
An EL insert film 5 in which an L light emitting portion 2 is laminated and an adhesive layer 4 is laminated so as to cover the coloring layer 13 and the EL light emitting portion 2 is integrally formed on an injection molded product 6, and a pattern is formed from the base film side. Are observed (see FIG. 8).

As still another example of the EL light emitting insert molded product of the present invention, a transparent electrode 8, a colored layer 13, a phosphor layer 9, an insulating layer 1
0, the back electrode 11, the back substrate film 14, and the EL insert film 5 in which the adhesive layer 4 is sequentially laminated.
The upper part is integrally formed, and a pattern is observed from the base film side (see FIG. 9).

In the method of manufacturing an EL light emitting insert molded product according to the present invention, the EL light emitting film 23 is placed in an injection mold, the mold is closed, the molding resin 15 is injected into the cavity 20, and the injection molded product 6 is formed. EL light emitting film 23 simultaneously with molding
And the injection molded article 6 are integrally molded to obtain an EL luminescent molded article 24. Then, a colored film 27 in which at least a colored layer 13 and an adhesive layer 25 are sequentially laminated on one surface of the light-transmitting base film 1 is subjected to EL. There is a product to be bonded on the light emitting molded product 24.

First, the EL light emitting film 23 is placed in an injection mold. As the EL light-emitting film 23, there is a laminate of a transparent electrode, a phosphor layer, an insulating layer, a back electrode, and an adhesive layer. Further, as the EL light-emitting film 23, a transparent electrode, a phosphor layer, an insulating layer,
There is a product in which a back electrode and an adhesive layer are laminated. Further, as the EL light emitting film 23, there is a material in which a transparent electrode, a coloring layer, a phosphor layer, an insulating layer, a back electrode, and an adhesive layer are laminated on a light transmitting base film. Further, as the EL light-emitting film, there is a material in which a transparent electrode, a coloring layer, a phosphor layer, an insulating layer, a back electrode, a back substrate film, and an adhesive layer are laminated on a light-transmitting base film. A part of the surface of the EL light emitting film 23 may be the protrusion 7 before being placed in the injection mold. The projection 7 may be formed on a part of the surface after the EL light emitting film 23 is placed in the injection mold. The EL light-emitting film 23 may be configured such that a long EL light-emitting film is once wound around a roll shaft to form a roll-shaped roll, and is continuously fed from the roll-shaped roll into an injection molding die. Injection molding dies include a fixed mold and a movable mold having a resin injection port, and the fixed mold and the movable mold are closed, thereby being surrounded by the cavity forming surfaces of the fixed mold and the movable mold. One or a plurality of cavities are formed. The fixed mold may have one or a plurality of protrusions for forming the through hole 26 in the injection molded product 6 and forming a protruding portion in the EL light emitting film 23. The movable type may have one or more concave portions into which the tips of the fixed type convex portions fit.
The mounting is performed so that the adhesive layer side of the EL light emitting film 23 faces the resin injection port of the injection molding die. The EL light emitting film 23 may be fixed on the parting surface around the cavity forming surface by a clamp member or the like, and the space formed by the EL light emitting film 23 and the cavity forming surface may be sealed. The EL light emitting film 23 may be fitted into a movable concave portion. Before closing the mold, E
The L light emitting film 23 may be softened and vacuum formed so that a part of the surface protrudes.

Next, the mold is closed, the molding resin is injected into the cavity, and simultaneously with the molding of the injection molded article 6, the EL light emitting film 23 and the injection molded article 6 are integrally molded. After the injection molded article 6 is cooled, Open the mold and take out the EL light emitting molded product 24 (see FIG. 10). Examples of the molding resin include resins such as polypropylene resin, acrylonitrile butadiene styrene resin, polystyrene resin, ethylene vinyl acetate resin, polycarbonate resin, and nylon resin.

Next, a colored film 27 in which at least a colored layer 13 and a pressure-sensitive adhesive layer 25 are sequentially laminated on one side of the light-transmitting base film 1 is placed on an EL luminescent molded product 24 so as to cover at least the EL luminescent film 23. Paste (Fig. 1
2). The colored film 27 is formed of a light-shielding ink, and a portion corresponding to the EL light-emitting film 23 may be a pattern of a blank character. The colored film 27 may also have the protrusion 7 corresponding to the protrusion 7 of the EL light emitting film 23 (see FIG. 11). As the pressure-sensitive adhesive layer 25, a pressure-sensitive adhesive such as an acrylic resin or a butyral resin,
It is preferable to use an adhesive such as a urethane resin, an epoxy resin, or an ethylene-vinyl acetate copolymer resin.

[0026]

【Example】

Example 1 A 100 μm-thick polyethylene terephthalate film having a transparent ITO conductive film formed on one side by sputtering was used as a substrate. In the picture layer, characters and symbols were formed by a pigment ink using a screen printing method, and a phosphor layer containing zinc sulfide, an insulating layer made of acrylic resin, and a back electrode containing carbon were sequentially formed. An adhesive layer having a thickness of 5 μm was formed by screen printing using polyacryl resin so as to cover the entire upper surface of the picture layer, thereby obtaining an EL insert film in which the EL light emitting portion was a button-shaped protrusion. This EL
The insert film was placed on the cavity forming surface of the injection mold. The injection mold was closed, and a molding resin made of an acrylic resin was injected into the cavity. By the heat and pressure of the molding resin, the adhesive layer of the EL insert film and the injection molded product having through holes were integrated. EL
The position of the projecting portion of the insert film was adjusted so as to cover the through hole of the injection molded product.

Example 2 A transparent ITO conductive film formed by sputtering, a phosphor layer containing zinc sulfide, an insulating layer made of an acrylic resin, was formed on one side of a polyethylene terephthalate film having a thickness of 100 μm.
A back electrode containing carbon was sequentially formed, and an adhesive layer was formed by screen printing using a polyacryl resin to a thickness of 5 μm to obtain an EL light emitting film. This E
The L light-emitting film is placed on the cavity forming surface of the injection molding die, the injection molding die is closed, and a molding resin made of a polycarbonate resin is injected into the cavity. The adhesive layer of the luminescent film and the injection molded product were integrated to obtain an EL luminescent molded product. On the other hand, a colored film in which characters, symbols, and the like were formed on one side of a 100 μm-thick polyethylene terephthalate film using a pigment ink by a screen printing method was obtained. An adhesive was formed on the colored film and attached to the EL light-emitting molded product prepared above.

In the above-described EL light emitting insert molded product of the present invention, since the light from the EL light emitting portion does not need to be transmitted through the injection molded product, light leaks to portions other than the necessary portions, and light is attenuated. It was excellent in design without performing. In the case of an injection molded product having a through hole, the entire surface of the EL light emitting portion is fixed to the base film, so the EL light emitting portion is firmly connected to the injection molded product via the base film, and the EL light emitting insert molded product is provided. Thus, the EL light emitting insert molded product having excellent durability without causing the EL light emitting portion to peel off or dislocating. Also, a design such as a pattern formed by printing using a coloring ink and E
The combination with the design by the light from the L light emitting portion provided a multifunctional design. In the case of an EL light emitting insert molded product having a projecting portion of an insert film covering a through hole of an injection molded product, the projected portion can be used as a button for a switch. A surface emitting button capable of causing the portion to emit light could be manufactured at low cost.

[0029]

According to the EL light emitting insert molded product and the method of manufacturing the same of the present invention, since the insert film in which the picture layer having the EL light emitting portion is laminated is integrally formed on the surface of the injection molded product, light leaks. In addition, it is possible to obtain a material having excellent design without light attenuation.
Further, in the EL light emitting insert molded article and the manufacturing method thereof according to the present invention, since the EL light emitting portion is protected by the base film, the EL light emitting portion is not exposed to the outer surface, and the EL light emitting portion is in contact with peripheral components and friction. Do not peel off or displace. Therefore, a product having excellent durability can be obtained. Further, in the EL light emitting insert molded product and the method of manufacturing the same according to the present invention, even when the EL light emitting portion is provided in the through hole of the injection molded product, the picture layer having the EL light emitting portion and the adhesive layer are sequentially laminated on one side of the base film. Done E
Since the L insert film and the injection molded product are integrally formed, the EL light emitting portion does not easily peel off from the EL light emitting insert molded product. Therefore, a product having excellent durability can be obtained. In the EL light emitting insert molded article and the method of manufacturing the same according to the present invention, since the EL light emitting film is integrally formed on the surface of the injection molded article, light does not leak or light is attenuated, and design is improved. Excellent things can be obtained. Further, in the EL light emitting insert molded product and the method of manufacturing the same according to the present invention, since the EL light emitting film is protected by the colored film,
The light-emitting film is not exposed on the outer surface, and the EL light-emitting portion is peeled off by contact or friction with peripheral components,
No misalignment. Therefore, a product having excellent durability can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of an EL light emitting insert molded product of the present invention.

FIG. 2 is a sectional view showing one embodiment of an EL light emitting insert molded product of the present invention.

FIG. 3 is a cross-sectional view showing one of the steps of the method for manufacturing an EL light emitting insert molded product according to the present invention.

FIG. 4 is a cross-sectional view showing one of the steps of the method for manufacturing an EL light emitting insert molded product according to the present invention.

FIG. 5 is a cross-sectional view showing one of the steps of the method for manufacturing an EL light emitting insert molded product according to the present invention.

FIG. 6 is a cross-sectional view showing one of the steps of the method for manufacturing an EL light emitting insert molded product according to the present invention.

FIG. 7 is a sectional view showing one embodiment of an EL light emitting insert molded product of the present invention.

FIG. 8 is a sectional view showing one embodiment of an EL light emitting insert molded product of the present invention.

FIG. 9 is a sectional view showing one embodiment of an EL light emitting insert molded product of the present invention.

FIG. 10 is a cross-sectional view showing an EL luminescent molded product used in the method for manufacturing an EL luminescent insert molded product of the present invention.

FIG. 11 is a cross-sectional view showing a colored film used in the method for manufacturing an EL light emitting insert molded product of the present invention.

FIG. 12 is a sectional view showing one embodiment of an EL light emitting insert molded product of the present invention.

DESCRIPTION OF SYMBOLS 1 Base film 2 EL light emitting part 3 Picture layer 4 Adhesive layer 5 EL insert film 6 Injection molded product 7 Projection 8 Transparent electrode 9 Phosphor layer 10 Insulating layer 11 Back electrode 12 Film side adhesive layer 13 Coloring layer Reference Signs List 14 back substrate film 15 molding resin 16 resin injection port 17 fixed mold 18 movable mold 19 cavity forming surface 20 cavity 21 convex portion 22 concave portion 23 EL light emitting film 24 EL light emitting molded product 25 adhesive layer 26 through hole 27 coloring film

Claims (6)

[Claims] 1. An EL insert film in which a picture layer having at least an EL light emitting portion and an adhesive layer are sequentially laminated on one surface of a light-transmitting base film, and are integrally formed on the surface of an injection-molded product. EL light emitting insert molded product. 2. An injection-molded article has a through-hole, and a portion of the base film covering the through-hole protrudes from the side opposite to the through-hole, and an EL light-emitting portion of a picture layer is expressed in the protruding portion. An EL light emitting insert molded product according to claim 1. 3. An EL insert film in which a picture layer having at least an EL light-emitting portion and an adhesive layer are sequentially laminated on one surface of a light-transmitting base film, and placed in an injection mold.
A method for manufacturing an EL light emitting insert molded product, comprising closing a mold, injecting a molding resin into a cavity, and simultaneously molding the injection molded product with the EL insert film and the injection molded product. 4. The injection molded article has a through hole, a portion covering the through hole of the EL insert film protrudes on a side opposite to the through hole, and an EL light emitting portion of the picture layer is expressed in the protruding portion. Item 4. A method for producing an EL light emitting insert molded product according to Item 3. 5. An EL light emitting film is placed in an injection molding die, the mold is closed, a molding resin is injected into the cavity, and simultaneously with the molding of the injection molded product, the EL light emitting film and the injection molded product are integrally molded. Characterized by laminating a colored film in which at least a colored layer and a pressure-sensitive adhesive layer are sequentially laminated on one surface of a light-transmitting base film on an EL luminescent film after obtaining an EL luminescent molded product by the method. Manufacturing method of molded article. 6. An injection-molded article having a through-hole, and a portion covering the through-hole of the EL light-emitting film is obtained in such a manner that a portion covering the through-hole protrudes to the side opposite to the through-hole. The method for manufacturing an EL light emitting insert molded product according to claim 5, wherein the molded product is laminated on the upper surface.