JPH11354712A - Sealing sheet and sealing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a sealing sheet to be easily stuck to an object, by interposing an IC chip and its antenna between two soft sheets and, at the same time, laminating an adhesive layer cured by incident light upon one surface of the laminated sheet composed of the soft sheets. SOLUTION: A laminated sheet 1 is formed by an interposing an IC chip 4 having a storage circuit and its antenna 5 between two soft sheets 2 and 3 made of a high polymer resin, such as the ethylene resin, propylene resin, polyester resin, etc. Then a sealing sheet is formed by laminating an adhesive 7 cured by incident light and composed of an acrylic polymer, an epoxy resin, and a photo-cation copolymerizer upon one surface of the laminated sheet 1. Therefore, the sealing sheet can be easily stuck to an object and, when the adhesive 7 cured by incident light is cured by irradiating the adhesive 7 with light, the adhesive 7 can firmly stick the sealing sheet to the object as an adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a sealing sheet and a sealing method using the same.

[0002]

2. Description of the Related Art In general, a ball-and-ball game board such as a pachinko machine,
A game control comprising a window frame, a glass door, a ball tray, a ball launcher, a ball feeder, a back mechanism set board having various ball processing units, a display device, and the like, and which can be electronically controlled according to the game content of the play board. The apparatus is set in a board box so as to be detachable and replaceable (for example, Japanese Patent No. 2742676). That is, the game control device is placed in a substrate box and sealed with an adhesive seal using a vapor-deposited film as a base material.

If this game control device is replaced with a game control device containing data of conditions favorable to the player, the player has an advantage. Therefore, the game control device is replaced with data containing conditions of favorable conditions for the player. If a person who attempts to replace the game control device does not stop and is replaced, the game hall and game center providing the ball game board will be seriously damaged, so the game hall and game center are open during business We are monitoring on a surveillance TV. Before the start of business, the game boards are opened one by one to check whether the sealing sheet has been peeled off.

[0004] However, no matter how much surveillance is performed on a surveillance television, the surveillance eye may be able to pass through the eyes of the surveillance skillfully, and if the sealing sheet is peeled off and then pasted again, it is extremely difficult to detect whether or not it has been peeled off. Met.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, an object of the present invention is to provide a sealing sheet which can be easily adhered to an adherend, and which can be found to be easily peeled when peeled after application. It is to provide a sealing method using the same.

[0006]

According to a first aspect of the present invention, there is provided a sealing sheet comprising: an IC chip having a memory circuit;
A light post-curing pressure-sensitive adhesive layer is laminated on one side of the laminated sheet, which is interposed between the flexible sheets of the layer and in which the flexible sheet is formed with a part that is easily broken. It is characterized by having.

According to a fourth aspect of the present invention, there is provided a sealing method, comprising a step of attaching the sealing sheet to an adherend and a step of irradiating light to cure the light post-curable adhesive.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The above sealing sheet will be described with reference to the drawings. FIG. 1 is a plan view showing an example of the sealing sheet according to claim 1, and FIG. 2 is a cross-sectional view taken along line II-II in FIG.

In FIG. 1, reference numeral 1 denotes a laminated sheet, which is formed by interposing an IC chip 4 having a memory circuit and its antenna 5 between two flexible sheets 2 and 3.

The sheets 2 and 3 may be transparent as long as they are flexible. For example, sheets made of a polymer resin such as an ethylene resin, a propylene resin, a polyester resin, an amide resin, and an imide resin are preferable. Further, the thickness of the sheet is not particularly limited, but it is necessary to break the sheet at a portion which is easily broken when a force is applied.
１００100 μm is preferred.

The IC chip 4 must have a memory circuit because the memory of the circuit needs to be read by an external scanner or the like. However, the IC chip 4 must have a microprocessor so that the memory can be rewritten or transmitted. , A decoding device, a receiving device, and the like. The antenna is formed in an annular shape by printing.

In the figure, reference numeral 7 denotes a light post-curing pressure-sensitive adhesive layer. The post-curing pressure-sensitive adhesive is one that exhibits tackiness before photocuring and exhibits adhesiveness rather than tackiness after photocuring. The sealing sheet can be attached to and peeled off from the adherend in the same manner as the adhesive tape before light curing, and can be peeled off from the adherend after light curing. Since it is necessary to break at a part that is easily broken,
180 degree peeling adhesive strength (based on JISZ0237)
However, the width is preferably 50 to 500 g / 25 mm before light curing, and 2,000 to 10,000 g / 25 mm after light curing.

The photo-curable pressure-sensitive adhesive preferably comprises an acrylic polymer, an epoxy resin and a cationic photopolymerization initiator.

As the acrylic polymer, any conventionally known polymer can be used.
82 to 95% by weight of an alkyl (meth) acrylate having an alkyl group of 4, 4.97 to 17.97% by weight of a vinyl monomer copolymerizable with the alkyl (meth) acrylate, and 0.03 to 3 of a photoradical polymerization initiator A polymer obtained by photopolymerization of a polymerizable composition of weight% is suitably used.

The above alkyl (meth) acrylate has an alkyl group having 2 to 14 carbon atoms and is, for example, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate. ) Acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, isomyristyl (meth) acrylate, etc.
Alkyl (meth) acrylates having 12 alkyl groups are preferred, with butyl acrylate and 2-ethylhexyl acrylate being particularly preferred. The above alkyl (meth) acrylates may be used alone or in combination of two or more.

The vinyl monomer is not particularly limited as long as it is a vinyl monomer copolymerizable with the alkyl (meth) acrylate. Examples of the vinyl monomer include (meth) acrylic acid, (meth) acrylamide, carboxyethyl acrylate, and the like.
Examples include isobonyl (meth) acrylate, alkoxyalkyl acrylate, vinylpyrrolidone, (meth) acrylonitrile, acryloylmorphylin and the like, with (meth) acrylic acid, vinylpyrrolidone and (meth) acrylamide being preferred.

The photo-radical initiator, which is conventionally used in photopolymerization and is activated by light in a wavelength region of 380 nm or more, does not cause energy transfer to the cationic polymerization initiator. Cleavage type is preferred, for example, 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone, α-hydroxy-α, α′-dimethylacetophenone, methoxyacetophenone, 2,2 dimethoxy-2-phenylacetone, 2-hydroxy- Examples include acetophenone-based photoradical initiators such as 2-cyclohexylacetophenone; ketal-based photoradical initiators such as benzyldimethylketal; halogenated ketones, acylphosphinoxides, acylphosphonates, and the like.

In the acrylic polymer, when the content of the alkyl (meth) acrylate is small, the tackiness is reduced, and when the content of the vinyl monomer is small, the cohesive strength is reduced.
-95% by weight, and the vinyl monomer is 4.97-1.
7.97% by weight is preferred.

On the other hand, if the amount of the photo-radical initiator is too small, the photopolymerization does not proceed sufficiently. If the amount is too large, the acrylic polymer becomes soft and the tackiness is reduced.
03-3% by weight is preferred.

A crosslinkable monomer may be added to the polymerizable composition in order to improve the heat resistance of the acrylic polymer, the cohesive strength at a high temperature, and the like. As the crosslinkable monomer, a polyfunctional monomer generally used when producing an acrylic pressure-sensitive adhesive can be used. For example, hexanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (Poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa ( (Meth) acrylate, epoxy acrylate, urethane acrylate and the like. If the amount of the crosslinkable monomer increases, gelation occurs and the tackiness decreases, so the content is preferably 5% or less in the polymerizable composition.

As the method of photopolymerizing the polymerizable composition, any conventionally known method may be employed. For example, the polymerizable composition may be 380 nm or more, preferably a mercury lamp, a chemical lamp, a black light lamp, a metal halide lamp or the like. Is a method of polymerizing by irradiating light with a lamp capable of emitting light having a wavelength of 380 to 450 nm.
The light intensity is preferably from 0.1 to 100 mW / cm ² .

As the epoxy resin, any known epoxy resin can be used, and examples thereof include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol AD type epoxy resin, phenol novolak type epoxy resin, cresol novolak type epoxy resin, Examples thereof include cycloaliphatic epoxy resins, glycidyl ester resins, glycidylamine resins, and heterocyclic epoxy resins.

The above cationic photopolymerization initiator has a wavelength of 380 nm.
It may be inactive to light in the above wavelength range and active to light in a wavelength range of less than 380 nm, and examples thereof include organometallic complexes and onium salts. The organometallic complex is described in detail in Japanese Patent Publication No. 5-506465. Examples of the onium salt include an aromatic diazonium salt, an aromatic iodonium salt, an aromatic sulfonium salt and the like, and Optomer SP-150 manufactured by Asahi Denka Kogyo Co., Ltd.
Optomer SP-170, UVE1014 manufactured by General Electronics, CD1012 manufactured by Sartomer, and the like are commercially available.

In the above-mentioned photo-post-curable pressure-sensitive adhesive, when the content of the acrylic polymer increases, the adhesive strength increases and the adhesive strength after curing becomes insufficient. Resin 9.99 to 89.99
% By weight is preferred. When the content of the cationic photopolymerization initiator is small, the curing becomes insufficient, and when the content is large, the adhesive strength is not improved. Therefore, the content is preferably 0.01 to 10% by weight.

The photo-post-curable pressure-sensitive adhesive may further contain a tackifier resin, a thickener, a bulking agent, a filler, a thixotropic agent, and the like. As the tackifying resin, for example,
Rosin resin, modified rosin resin, terpene resin, terpene phenolic resin, aromatic modified terpene resin,
Petroleum resins, hydrogenated petroleum resins and the like are mentioned, and hydrogenated petroleum resins are preferably used.

As the thickener, for example, acrylic rubber,
Examples include epichlorohydrin rubber, isoprene rubber, butyl rubber, and the like, and examples of the extender include calcium carbonate, titanium oxide, and clay. Examples of the filler include glass balloon, alumina balloon, ceramic balloon, shirasu balloon, vinylidene chloride, acrylic balloon, mica, nylon bead, acrylic bead, silicon bead, polyethylene bead, polyester fiber, rayon fiber, and nylon fiber. can give.

The method for producing the above-mentioned photo-post-curable pressure-sensitive adhesive may be any method, for example, a method in which the acrylic polymer, an epoxy resin and a photo-cationic polymerization initiator are added and mixed, and an alkyl (meth) acrylate. , A vinyl monomer copolymerizable with an alkyl (meth) acrylate,
After adding and mixing the photo-radical polymerization initiator and the epoxy resin and the photo-cationic polymerization initiator, the mixture is irradiated with light in a wavelength region of 380 nm or more to form an alkyl (meth) acrylate or a vinyl monomer copolymerizable with the alkyl (meth) acrylate. Copolymerization method and the like can be mentioned.

In order to laminate the photo-curable pressure-sensitive adhesive layer on one surface of the laminated sheet, the above-mentioned photo-curable pressure-sensitive adhesive may be applied to one surface of the laminated sheet. A mixture of an acrylate, a vinyl monomer copolymerizable with an alkyl (meth) acrylate, a photoradical polymerization initiator, and an epoxy resin and a photocationic polymerization initiator is applied to one surface of a laminated sheet, and then irradiated with light in a wavelength region of 380 nm or more. Then, an alkyl (meth) acrylate or a vinyl monomer copolymerizable with the alkyl (meth) acrylate may be copolymerized and laminated.

In the figure, 6, 6... Are notches, which are portions that are likely to break the flexible sheet partially. The notch can have any shape, but preferably has a V-shaped pointed end. Further, other examples of the portion that is easily broken include a concave streak and a perforation. It is preferable that these easily breakable portions are arranged so as to be easily broken in the width direction of the flexible sheet, and when the flexible sheet is broken, the antennas interposed between the flexible sheets are together. It is arranged to be broken.

The breaking strength of a part of the flexible sheet that is easily broken is determined by applying the sealing sheet to the adherend and irradiating the light post-curable pressure-sensitive adhesive layer with light to cure the light post-curable pressure-sensitive adhesive. The peel strength is preferably smaller than the peeling strength at which the sealing sheet after peeling off from the adherend.

The method of stopping the adherend with the sealing sheet includes a step of attaching the sealing sheet to the adherend and a step of irradiating light to cure the photo-curable pressure-sensitive adhesive. The light irradiation may be performed by irradiating light in a wavelength region in which the photocationic polymerization initiator is activated.
Irradiate light of 50 to 370 nm.

The light irradiation may be performed after the sealing sheet is attached to the adherend or before the attachment. However, when irradiating with light before applying, it is necessary to apply the light post-curing adhesive before curing. It must be light transmissive to the extent possible.

In order to irradiate light, it is sufficient to irradiate light having a wavelength of 380 nm or less with the above-mentioned mercury lamp, chemical lamp, black light lamp, metal halide lamp or the like.
The light intensity is preferably from 0.1 to 100 mW / cm ² .

Since the structure of the sealing sheet is as described above, before the photo-curable pressure-sensitive adhesive is cured, it exhibits the same performance as the pressure-sensitive adhesive tape, and after the curing, it becomes like an adhesive and becomes adherent. When the sealing tape is to be peeled off after curing, it will be broken at a portion of the sheet that is easily broken. Therefore, it can be suitably used for sealing places where tampering is difficult.

Further, the sealing sheet has an I having a memory circuit.
Since the C chip and its antenna are interposed, it can be suitably used for sealing a substrate box for accommodating a game control device of a ball and ball game board. That is, the game control device of the ball and ball game board is put in the substrate box, the sealing sheet is attached, and light is irradiated to cure the light-curable pressure-sensitive adhesive.

At this time, necessary data is input to the IC chip so that it can be recognized by an external computer, and the data in the IC chip is read and monitored when necessary.

If the sealing sheet is peeled off and the game control device of the ball-and-play board in the container is to be replaced, the sealing sheet is broken from a portion which is easily broken and the antenna is cut off. As a result, even if it is re-attached, if it is monitored with a computer, data cannot be read from the sealing tape or data different from the input data will be readable, so you can easily find out which sealing sheet has been broken . Therefore, by sealing with this sealing sheet and monitoring the computer, when the game control device of the ball and ball game board is replaced, it can be easily and quickly found.

[0038]

Since the structure of the sealing sheet of the present invention is as described above, it can be easily adhered to an adherend, and when it is cured by irradiating light to a light post-curing pressure-sensitive adhesive, it becomes strong like an adhesive. Attempts to adhere and peel off the flexible sheet at the easily breakable portion. Therefore, it can be suitably used for applications requiring tampering prevention.

Further, since an IC chip having a memory circuit and its antenna are interposed on the laminated sheet of the sealing sheet, it is possible to easily monitor whether the sealing sheet has been broken by a computer. The present invention can be suitably used for sealing a board box for accommodating a game control device of a ball game board in a game hall or a game center providing a ball game board which needs to monitor a large number of objects. Furthermore, it can be used as a similar type of computer board management of a financial institution or as a sealing seal for preventing theft of motorcycles, bicycles and the like.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a sealing sheet of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated sheet 2, 3 Flexible sheet 4 IC chip 5 Antenna 6 Notch 7 Light post-curing adhesive layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01L 23/31 C09J 163/00 // C09J 7/02 H01L 23/30 D 163/00

Claims (5)

[Claims] 1. A laminated structure in which an IC chip having a memory circuit and an antenna thereof are interposed between two layers of a flexible sheet, and the flexible sheet has a part which is easily broken. A sealing sheet, wherein a light post-curing pressure-sensitive adhesive layer is laminated on one surface of the sheet. 2. The photo-post-curable pressure-sensitive adhesive comprises 10 to 90% by weight of an acrylic polymer and 9.9 to 89.99 of an epoxy resin.
% By weight and 0.01 to 10% by weight of a cationic photopolymerization initiator
The sealing sheet according to claim 1, further comprising: 3. The sealing sheet according to claim 1, wherein the easily breakable portion is a notch, a groove or a perforation. 4. A step of attaching the sealing sheet according to claim 1 to an adherend, and a step of irradiating light to cure a light post-curable pressure-sensitive adhesive. Sealing method. 5. The sealing method according to claim 4, wherein the adherend is a board box for storing a game control device for a ball and ball game board.