JPH10274939A - Electrostatic recording sheet for illumination signboard and illumination signboard using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrostatic recording sheet capable of manufacturing an illumination signboard using an acrylic board by a simple process. SOLUTION: Relating to this electrostatic recording sheet for which a conductive layer 12 and a dielectric layer 13 are formed on a base material 11, hot-melt adhesive resin is used as resin for constituting the dielectric layer. Or, the layer of the hot-melt adhesive resin is provided on the dielectric layer 12. As the hot-melt adhesive resin, thermoplastic resin whose melting point is 80-150 deg.C is used and a tackifier such as rosin or the like or a wax kind is added as needed. For the electrostatic recording sheet, by plotting images on the dielectric layer 13 or the layer of the hot-meltable resin which is an outermost layer by an electrostatic plotter or the like and adhering a surface where the images are formed to the acrylic board by thermal melt-sticking, the illumination signboard is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic recording sheet for producing an electric signboard using an acrylic plate and an electric signboard using such an electrostatic recording sheet. The present invention relates to an electrostatic recording sheet from which an illuminated signboard can be manufactured.

[0002]

2. Description of the Related Art Conventionally, when a patterned illuminated acrylic plate is manufactured, various designs are formed on the acrylic plate by printing such as silk printing. This printing method is necessary for producing plates of each color, so it is suitable for mass production of small varieties. However, the cost per sheet is relatively high for small lots, and it is not suitable for production of small varieties of many varieties. was there.

On the other hand, a transfer method using an electrostatic recording paper in which a conductive layer and a dielectric layer are sequentially laminated on a base material such as paper is used. According to this transfer method, 1) an image input by a scanner or the like is output on an electrostatic recording paper by an electrostatic plotter. 2) The surface on the dielectric layer side on which an image is formed is placed via an adhesive sheet or a hot melt sheet. 3) The whole is immersed in water to dissolve the conductive layer of the electrostatic recording paper, and the paper that is the base material of the electrostatic recording paper is removed together with the conductive layer. Thereby, an acrylic plate with a pattern in which only the dielectric layer and the image are transferred to the acrylic plate is formed.

[0004] However, this transfer system requires peeling of the base material of the electrostatic recording paper after forming an image on the electrostatic recording paper, which causes a problem that the production is complicated and the paper is wasted. is there.

The present applicant uses an electrostatic recording material in which a conductive layer and a dielectric layer are sequentially laminated on a substantially transparent plastic film, and after forming a mirror image on the electrostatic recording material with an electrostatic plotter, A method has been proposed in which the surface on which an image is formed is directly adhered to an acrylic plate or the like via an adhesive layer (Japanese Patent Laid-Open No. 7-104673). In this method, the electrostatic recording material becomes a part of the display object as it is, so that the base material is a substantially transparent material from which an image can be viewed from the base material side, and a water-resistant resin is used as the conductive layer. By using this, the problem of waste of paper is solved, and the method of manufacturing an illuminated signboard is simplified compared to the above-mentioned conventional transfer method, but a step of forming an adhesive layer is required.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electrostatic recording sheet which makes it extremely easy to produce an illuminated signboard and which does not waste paper and film, and an illuminated signboard using the same. Aim.

[0007]

The electrostatic recording sheet of the present invention that achieves the above object includes a base material, and a conductive layer and a dielectric layer sequentially formed on the base material. It consists of a layer that can be hot melt bonded.

Further, the electrostatic recording sheet of the present invention comprises:
A conductive layer and a dielectric layer are sequentially formed on the substrate, and a layer capable of hot-melt adhesion is provided on the dielectric layer.

In the present invention, the layer capable of hot-melt bonding is a layer containing a base resin constituting a so-called hot-melt adhesive as a base resin.
It is a layer containing a thermoplastic resin at 200 to 200 ° C, preferably 80 to 150 ° C.

In the electrostatic recording sheet of the present invention, the conductive layer preferably contains a water-resistant resin and a conductive agent. Further, the electrostatic recording sheet of the present invention is preferably a substrate, a conductive layer,
At least one of the dielectric layer and the thermoplastic resin layer or a layer provided separately from these layers has an ultraviolet absorbing ability.

In the electrostatic recording sheet of the present invention, when an image is formed on a dielectric layer or a thermoplastic resin layer by electrostatic recording when a thermoplastic resin layer is provided on the dielectric layer, the image is formed on the dielectric layer or on the dielectric layer. By bonding the layer to the acrylic plate for an electric signboard by heat fusion, an electric signboard can be obtained. In other words, the illuminated signboard of the present invention forms an image on the dielectric layer of the electrostatic recording sheet or a layer thereon (thermoplastic resin layer) by electrostatic recording, and then heats the dielectric layer or the layer thereon. It is formed by bonding to an acrylic plate by fusion.

[0012]

1 and 2 show an embodiment of an electrostatic recording sheet for an illuminated signboard of the present invention. The electrostatic recording sheet 10 shown in FIG. And a dielectric layer 13 containing a thermoplastic resin capable of hot-melt adhesion (hereinafter referred to as a hot-melt dielectric layer) 13. FIG.
The electrostatic recording sheet 10 ′ includes a base material 11, a conductive layer 12, a dielectric layer 13 ′, and a layer 14 containing a thermoplastic resin capable of hot-melt adhesion (hereinafter, referred to as a hot-melt layer) 14. These electrostatic recording sheets 10, 10 'are formed by forming an image by electrostatic recording on the hot-melt dielectric layer 13 or the hot-melt layer 14, and then thermally bonding the hot-melt dielectric layer 13 or the hot-melt layer 14 directly to an acrylic plate. By doing so, it is used for the manufacture of electric signs.

In this case, the electrostatic recording sheet after the electrostatic recording is adhered to the acrylic plate so as to be the outermost layer of the illuminated signboard, or is adhered to the inside of the acrylic plate so that the acrylic plate is the outermost layer. In the former case, the image formed by the electrostatic recording is a mirror image and the total light transmittance is 40 so that the image surface can be viewed from the outside as the base material 11 of the electrostatic recording sheet. % Is desirable. On the other hand, when adhered to the inside of the acrylic plate, the image is a normal image, and the substrate 11 is not required to have light transmittance, and may be colored white or another color. Base material 11 depending on use
It is also possible to impart a diffusivity to the colorant, and in this case, those having a white haze value of 50% or more are preferable.

The substrate 11 of these electrostatic recording sheets is
Since the signboard is formed integrally with the acrylic plate, it must have weather resistance. Examples of such a material include plastic films such as polyester resin, polyvinyl chloride resin, polypropylene, polyethylene, polymethacrylate, polycarbonate, and fluororesin, and polyester and polymethyl methacrylate are particularly preferable.

The base material 11 has a thickness required for recording by an electrostatic plotter and has a thickness of about 50 μm to 200 μm.

The conductive layer 12 is formed by depositing a conductive agent on a film of the base material 11 or mainly comprising a conductive agent and a binder resin.

As the conductive agent, an ion conductive type conductive agent such as a quaternary ammonium salt can be used, but there is a drawback that the recording quality is easily affected by the environment. A combination with an organic polymer material, particularly a crosslinked polymer material, is preferred. Examples of the electron conductive type conductive agent include conductive mica, zinc oxide, tin oxide, indium oxide, titanium oxide, vanadium oxide, and fine metal powder.

When the conductive layer 12 is composed of a conductive agent and a binder resin, it is preferable to use a hydrophobic resin as the binder. As the hydrophobic binder, commonly used polymers or copolymers of vinyl acetate, vinyl chloride, styrene, butadiene, acrylate, methacrylate, ethylene, acrylonitrile, silicone resin, polyester resin, polyurethane resin, alkyd One or a mixture of two or more of resins, epoxy resins and the like can be used. In particular, it is desirable to use a crosslinkable polymer material which becomes insoluble or hardly soluble in an organic solvent after curing. Since the crosslinkable polymer material is hardly affected by the environment and does not change with time, the weather resistance of the illuminated signboard can be enhanced by using the crosslinkable polymer material.

Examples of the crosslinkable polymer material include amino resins such as urethane resins, acrylic resins, acrylate resins, methacrylate resins, phenol resins, melamine resins, urea resins, alkyd resins, and the like. Epoxy resin, butyral resin, organic silicon compound,
Examples include petroleum resins and unsaturated polyesters, and one or a combination of two or more of these can be used. These crosslinkable polymer materials can be used in combination with one or more of the above-mentioned ordinary hydrophobic binders.

When a crosslinkable polymer material is used as a binder for the conductive layer, after applying a composition containing a binder, a conductive agent and necessary crosslinkers and additives, a heat treatment, a UV treatment, an electron beam Crosslinking and curing by treatment.

The content of the conductive agent in the conductive layer 12 is not particularly limited, but the range in which the surface resistance of the electrostatic recording sheet satisfies the recording suitability by an electrostatic plotter (10 ⁵ to 10 ⁷ Ω / □).
It is necessary to have a resistance value such that

When the dielectric layer 13 itself has hot melt adhesiveness (the embodiment of FIG. 1), it is made of a thermoplastic resin which melts at 50 to 200 ° C. If the melting point is less than 50 ° C., blocking is likely to occur, and if it exceeds 200 ° C., it becomes difficult to perform heat bonding work by a normal applicator. 80-1 especially when the illuminated signboard is an acrylic board
Those which are in a molten state at 50 ° C. and exhibit sufficient adhesive strength to an acrylic plate are preferred.

Examples of such a resin include ethylene-vinyl acetate copolymer, polyethylene, polypropylene, atactic polypropylene, ethylene-acrylic resin, polyamide resin, thermoplastic polyester resin, and vinyl chloride resin.
And vinyl acetate copolymer. Further, for the purpose of lowering the melt viscosity of these resins and improving the adhesiveness, tackifier resins such as rosin, rosin derivatives, terpene resins, coumarone-indene resins, petroleum resins and paraffin wax, microcrystalline wax, polyethylene wax, etc. May be included.

When the dielectric layer 13 is formed of such a resin having a hot-melt property, the dielectric layer 13 is formed by applying a coating solution obtained by dissolving or dispersing the resin in an organic solvent on the conductive layer. I do.

When the dielectric layer is the outermost layer, it is preferable to include a pigment such as an inorganic pigment or an organic pigment in order to keep a predetermined distance from the electrode during electrostatic recording. As the inorganic pigment, kaolin, amorphous silica, titanium dioxide, zinc oxide, barium sulfate, magnesium oxide, aluminum hydroxide, calcium carbonate and the like can be used, and as the organic pigment, a synthetic resin powder such as a polyethylene powder and a polystyrene powder can be used.

The amount of the pigment contained in the dielectric layer is preferably 3 to 80% based on the resin. If it exceeds 80%, a sufficient adhesive strength with the acrylic plate cannot be obtained. On the other hand, 3%
If it is less than the above, the distance from the electrode may not be sufficient.

The dielectric layer may further contain a plasticizer, an antioxidant and the like, if necessary.

On the other hand, when the hot melt layer 14 is provided separately from the dielectric layer 13 '(the embodiment of FIG. 2),
The resin constituting 3 ′ is not limited to the above-mentioned resins, and any resin other than a resin having a higher heat melting temperature or a thermoplastic resin than the above resin can be used as long as it has weather resistance and water resistance. . As such a resin, for example, an ethylene-vinyl acetate copolymer, an ethylene-acrylic resin, a thermoplastic polyester resin, a vinyl chloride-vinyl acetate copolymer having a melting point higher than the above range, an acrylic resin, a polyvinyl butyral resin , A silicone resin, a polystyrene resin, a cellulose derivative resin and the like.

The pigment may be contained similarly to the hot melt dielectric layer 13.

The hot-melt layer 14 provided on the dielectric layer 13 'uses the same resin as the hot-melt dielectric layer 13 of FIG. The hot melt layer 14 is formed by coating a coating liquid formed by dissolving or dispersing a thermoplastic resin in an organic solvent on the dielectric layer 1.
It is formed by coating on 3 '. The dielectric layer 13 ′ and the hot melt layer 14 may contain a pigment similarly to the hot melt dielectric layer 13.

The thicknesses of the dielectric layers 13, 13 ′ and the hot melt layer 14 are not particularly limited, but from the viewpoint of suitability for electrostatic recording, the dielectric layer 13 or the dielectric layer 13 ′ + the hot melt layer 14
Is 30 μm or less, preferably 20 μm or less. The density required for an image can be obtained in such a range. On the other hand, in order to obtain sufficient adhesiveness with the acrylic plate, the thickness is set to 2 μm or more, preferably 3 μm or more. Therefore, the thickness of the dielectric layer + hot melt layer is set to 3 μm to 20 μm.
By doing so, both electrostatic recording characteristics and adhesiveness can be satisfied.

The electrostatic recording sheet of the present invention comprises the base material described above,
It is preferable that any one of the conductive layer, the dielectric layer, and the hot melt layer has an ultraviolet absorbing ability. For this purpose, an ultraviolet absorbent is kneaded into at least one of the base material, the conductive layer, the dielectric layer, and the hot melt layer. Or a layer containing an ultraviolet absorber may be laminated below or between these layers. In the illuminated signboard of the present invention, when the base material is the outermost layer, it is most preferable that the base material contains an ultraviolet absorbent, and when the acrylic plate is the outermost layer, the hot melt dielectric layer or the hot melt is used. It is preferred that the layer contains an ultraviolet absorber.

Examples of the UV absorber include known benzophenones, salicylates, benzotriazoles and the like. In the case of kneading, it is contained in an amount of about 0.01 to 10% by weight based on the resin forming the layer. Let me know. As a method of laminating, an ultraviolet absorber and a resin similar to the resin constituting the layer, for example, an acrylic resin, an ethylene-vinyl acetate copolymer, a polyvinyl butyral resin, a silicone resin, a thermoplastic polyester resin, a polystyrene resin,
A coating solution containing a vinyl chloride-vinyl acetate copolymer and a resin such as a cellulose derivative resin is applied or spray-coated.

As shown in FIG. 3, the illuminated signboard of the present invention forms a normal image on the hot-melt dielectric layer 13 (or hot-melt layer 14) of the electrostatic recording sheet 10 constructed as described above by an electrostatic plotter. After the image “signboard” 15 is formed, it can be manufactured by overlapping and heating and pressurizing the image forming surface and the inside of the acrylic plate 20 which constitutes the electric signboard, thereby eliminating a complicated process. This illuminated signboard allows an image to be viewed through an acrylic plate.

As shown in FIG. 4, the illuminated signboard of the present invention has an image "signboard" 15 'which is a mirror image on the hot melt dielectric layer 13 (or hot melt layer 14) of the electrostatic recording sheet 10 by an electrostatic plotter. May be formed on the image forming surface and the outside of the acrylic plate 20 and then heated and pressed.

In any case, since the electrostatic recording sheet has a base material made of a material having weather resistance and functions as a cover film for an image, the resulting illuminated signboard can prevent fading and deterioration of the image.

[0037]

Examples of the present invention will be described below. Example 1 A two-part curable urethane resin 100 dissolved in an organic solvent was coated on a substrate made of a polyester film having a thickness of 50 μm.
0.1 parts by weight of benzophenone-based ultraviolet absorber
The coating solution added in parts by weight was applied and dried with a Mayer bar to obtain an ultraviolet absorbing layer having a thickness of 10 μm. On the opposite side of the base material, a coating liquid in which a metal compound of tin oxide doped with antimony was dispersed in 100 parts by weight with respect to 80 parts by weight of a saturated polyester resin dissolved in an organic solvent was applied by a Meyer bar and dried. A conductive layer having a thickness of 0.7 μm is formed, and 5 parts by weight of amorphous silica having a particle size of 4 μm is dispersed on 10 parts by weight of an ethylene-vinyl acetate copolymer resin dissolved in an organic solvent. The solution was applied with a Meyer bar and dried to form a 10 μm thick hot melt adhesive dielectric layer, thereby obtaining an electrostatic recording sheet.

This electrostatic recording sheet is placed on an electrostatic plotter (C
E-3424: Versatech Co.)
The thickness of the hot melt dielectric layer on which the image is formed is 3 mm.
Roll temperature of 10 using a heat laminator on the acrylic plate
It was attached at 0 ° C. at a laminating speed of 5 mm / sec to produce an illuminated signboard.

Example 2 Coating in which 100 parts by weight of a tin oxide metal compound doped with antimony was dispersed in 80 parts by weight of a saturated polyester resin dissolved in an organic solvent, on a 100-μm-thick polyester film base material. The solution was applied with a Mayer bar and dried to form a conductive layer having a thickness of 0.7 μm, and a non-conductive layer having a particle size of 4 μm was formed on 10 parts by weight of an ethylene-vinyl acetate copolymer resin dissolved in an organic solvent. Crystalline silica 5
10 parts by weight of a coating liquid containing 2 parts by weight of paraffin wax and 2 parts by weight of paraffin wax dispersed and dried with a Mayer bar.
To form a dielectric layer capable of hot-melt bonding to obtain an electrostatic recording sheet.

Using this electrostatic recording sheet, an illuminated signboard was manufactured in the same manner as in Example 1.

Example 3 Coating in which 100 parts by weight of a tin oxide metal compound doped with antimony was dispersed in 80 parts by weight of a saturated polyester resin dissolved in an organic solvent on a base material made of a 100-μm-thick polyester film. The liquid was applied with a Mayer bar and dried to form a conductive layer having a thickness of 0.7 μm, and 10 parts by weight of calcium carbonate having a particle size of 10 μm was added to 10 parts by weight of a polyester resin dissolved in an organic solvent. The dispersed coating liquid was applied using a Meyer bar and dried to form a 6 μm-thick dielectric layer, on which was further added 20 parts by weight of an ethylene-acryl emulsion dissolved in 80 parts by weight of a 20% aqueous solution of meta-modified alcohol. Was applied and dried with a Mayer bar to form a hot melt layer having a thickness of 5 μm, thereby obtaining an electrostatic recording sheet.

Using this electrostatic recording sheet, an illuminated signboard was manufactured in the same manner as in Example 1.

In each of the examples, an electrostatic recording sheet having good adhesiveness to the acrylic plate was obtained, and an illuminated signboard could be easily manufactured.

[0044]

As is clear from the above examples, in the electrostatic recording sheet for illuminated signboard of the present invention, the dielectric layer is made of a layer having hot-melt adhesive property, or hot-melt adhesive is applied on the dielectric layer. By providing the layer having the property, the image can be formed by directly hot-melt bonding the electrostatic recording sheet after the image formation to the acrylic plate for the illumination signboard, so that the illumination can be performed without wasting paper or the like. Signboards can be manufactured very easily. In addition, since the base material functions as a cover film for protecting the image as it is, discoloration and deterioration of the image can be prevented.

The electrostatic recording sheet for an illuminated signboard of the present invention can provide an illuminated signboard having excellent weather resistance by using a hydrophobic resin as a conductive layer and having a layer having an ultraviolet absorbing ability. it can.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of an electrostatic recording sheet of the present invention.

FIG. 2 is a diagram showing another embodiment of the electrostatic recording sheet of the present invention and a method of using the same.

FIG. 3 is a view showing an embodiment of an illuminated signboard of the present invention.

FIG. 4 is a view showing another embodiment of the illuminated signboard of the present invention.

[Explanation of symbols]

 11 base material 12 conductive layer 13 hot melt dielectric layer 13 'dielectric layer 14 hot melt layer 10 , 10 '... electrostatic recording sheet 15, 15' ... image 20 ... acrylic plate

Claims (6)

[Claims] 1. An electrostatic sign for an electric signboard, comprising: a base material; and a conductive layer and a dielectric layer sequentially formed on the base material, wherein the dielectric layer comprises a layer capable of hot-melt adhesion. Recording sheet. 2. An illuminated signboard comprising: a base material; a conductive layer and a dielectric layer sequentially formed on the base material; and a layer capable of hot-melt bonding provided on the dielectric layer. Electrostatic recording sheet. 3. The electrostatic recording sheet for an illuminated signboard according to claim 1, wherein the conductive layer contains a hydrophobic resin and a conductive agent. 4. The method according to claim 1, wherein at least one of the substrate, the conductive layer, the dielectric layer, and the layer capable of hot-melt adhesion or a layer provided separately from these layers has an ultraviolet absorbing ability. 4. The electrostatic recording sheet for an illuminated signboard according to any one of the above items 3. 5. After forming an image on the dielectric layer of the electrostatic recording sheet according to claim 1 by electrostatic recording, the surface of the dielectric layer is bonded to an acrylic plate for an electric signboard by heat fusion. An illuminated signboard. 6. An electric signboard according to claim 2, wherein an image is formed on said hot-melt-adherable layer by electrostatic recording, and then the surface of said thermoplastic resin layer is heat-sealed by heat fusion. Illuminated signboard adhered to an acrylic plate.