JP4111565B2 - EMI shielding sheet - Google Patents

Description

【００１２】
（注）
（Ａ）抗菌性合成樹脂フィルム
１）抗菌性ＰＶＣフィルム１：ポリ塩化ビニル［三菱化成ビニル(株)製、商品名：ビニカＰ５１０、平均重合度１５００］１００重量部に対し、イオンピュアー［石塚硝子(株)製、金属イオン担持無機抗菌剤］１重量部、ジオクチルフタレート２５重量部、エポキシ系可塑剤５重量部及びバリウム亜鉛系安定剤２重量部を配合したもの。
２）抗菌性ＰＶＣフィルム２：上記ポリ塩化ビニル１００重量部に対し、ゼオミック［品川燃料(株)製、金属イオン担持抗菌性ゼオライト］１重量部及びジオクチルフタレート２５重量部を配合したもの。
３）抗菌性ＰＶＣフィルム３：上記ポリ塩化ビニル１００重量部に対し、プリベントールＡ３［バイエル社製、ベンズイミダゾール系抗菌剤］０.３重量部、ジオクチルフタレート２５重量部、エポキシ系可塑剤５重量部及びバリウム亜鉛系安定剤２重量部を配合したもの。
（Ａ'）合成樹脂フィルム
４）ＰＶＣフィルム：上記ポリ塩化ビニル１００重量部に対し、ジオクチルフタレート２５重量部を配合したもの（抗菌剤を含まず）。
（Ｂ）合成樹脂フィルム
５）ＰＶＣフィルム：上記ポリ塩化ビニル１００重量部に対し、ジオクチルフタレート２０重量部を配合したもの。
（Ｃ）接着剤層
６）アクリル系粘着剤：東洋インキ製造(株)製、商品名オリバインＢＰＳ４８９１。
（Ｄ）電磁波シールド層
７）金属メッキ繊維の織布：クロムメッキしたポリエステル繊維から成る厚さ２５０μｍの織布［神東塗料(株)製、商品名：シントロンＥ−９２１２］。
８）導電性コーティング剤：一液型熱可塑性アクリル系樹脂と銅粉末から成るコーティング剤［神東塗料(株)製、商品名：シントロンＥ−３３１５］。
（Ｅ）接着剤層
９）アクリル系粘着剤：東洋インキ製造(株)製、商品名オリバインＢＰＳ４８９１。
【００１３】
【表２】

【００１４】
【表３】

【００１５】
（注）
１）試験菌浮遊液：１／１０００濃度ＮＢ（ｎｕｔｒｉｅｎｄ ｂｒｏｔｈ）培地含有リン酸緩衝液
２）滴下した菌液の生菌数を測定し、試験片１枚当たりに換算した。
３）試験片に滴下した菌液と同量の菌液をプラスチックシャーレ内に滴下し、ポリエチレンフィルムを密着させて保存した。
４）＜１０：本試験で用いた菌数測定法により菌が検出されなかったことを意味する。
第２表から明らかなように、ＥＭＩシールド層を設けた実施例の方が、ＥＭＩシールド層を設けない比較例に比べて、電磁波遮蔽性に優れていることが分かる。
また、表面層に、抗菌剤を含有させたポリ塩化ビニルフィルムを用いた実施例のものは、抗菌剤を含有しないポリ塩化ビニルフィルムを用いた比較例のものに比べて、優れた抗菌性能を有することが分かる。
【００１６】
【発明の効果】
本発明のＥＭＩシールド性化粧シートは、電子機器などが放射する電磁波を効果的に遮蔽しうるとともに、抗菌性能を有し、しかも施工が容易で、かつコストが低いなどの特徴を有し、特に医療施設や公共施設などの壁面の化粧用として好適に用いられる。
【図面の簡単な説明】
【図１】図１は本発明の化粧シートの１例の断面図である。
【符号の説明】
１ 抗菌性合成樹脂フィルム
２ 合成樹脂フィルム
３ 接着剤層
４ ＥＭＩシールド層
５ 接着剤層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a novel electromagnetic wave shielding decorative sheet, and more specifically, it can effectively shield electric and magnetic fields radiated by electronic devices and the like, and has antibacterial performance, particularly in medical facilities and public facilities. The present invention relates to an electromagnetic wave shielding decorative sheet suitable for use on a wall surface.
[0002]
[Prior art]
In recent years, with the advancement of electronics technology, various electronic devices have become widespread for industrial use and consumer use. As a result, electromagnetic waves (electric field waves and magnetic field waves in the range of 10 kHz to 1 GHz) leaking from electronic devices often cause malfunctions of various electronic devices, which has become a social problem. In particular, the obstacles that electromagnetic waves radiated from computers, office processing equipment, and the like give to televisions, audio equipment, and the like are significant. Therefore, in order to prevent the occurrence of such troubles due to electromagnetic waves, not only electronic devices that are affected by electromagnetic waves, but also electronic devices that are the sources of electromagnetic waves are provided with a housing that has an electromagnetic wave shield (hereinafter referred to as “EMI shield”). Containment has become commonplace.
However, this housing generally has fine gaps and penetrating portions, so that there is a problem that leakage of electromagnetic waves and failure due to electromagnetic waves cannot be completely prevented. Therefore, in order to shield such electromagnetic waves that are inevitably leaked and radiated to prevent the radiation outside the room, and to shield electromagnetic waves incident from the outside, EMI shielding interior materials and the like have attracted attention.
Conventionally, when decorating an indoor wall surface to shield electromagnetic waves, a conductive material such as a metal plate is first fixed to the wall surface, and the joint is sealed by welding or the like, and then a decorative material is attached by pasting or the like. The method was used. However, this method has a problem that it takes a lot of work for construction and it is inevitable that the cost is high.
On the other hand, in recent years, there has been a tendency for nosocomial infections due to MRSA (Staphylococcus aureus) and mass food poisoning due to pathogenic microorganisms, and therefore there is a demand for various products with antibacterial properties, particularly in medical facilities and public facilities. As for interior materials such as wall materials, those having antibacterial performance are attracting attention.
[0003]
[Problems to be solved by the invention]
Under such circumstances, the present invention can effectively shield electromagnetic waves radiated by electronic devices and the like, has antibacterial performance, is easy to construct, and is low in cost. The object of the present invention is to provide an EMI shielding decorative sheet suitable for use on a wall of a public facility.
[0004]
[Means for Solving the Problems]
  As a result of intensive research to develop an antibacterial EMI shielding decorative sheet having the above-mentioned preferable properties, the present inventors have determined that the surface layer has antibacterial properties and the inner layer has an EMI shielding layer. The present inventors have found that a decorative sheet made of a laminate having the structure described above can be adapted to the purpose, and has completed the present invention based on this finding.
  That is, the present invention
(1) (A)It was obtained by molding a resin blend in which an antibacterial agent was blended with a synthetic resin component into a film having a thickness of 50 to 300 μm.Antibacterial synthetic resin film (D) With a thickness of 25-300 μmAn EMI shielding decorative sheet formed by sequentially laminating an EMI shielding layer and an adhesive layer (E),
as well as
(2) (A)It was obtained by molding a resin blend in which an antibacterial agent was blended with a synthetic resin component into a film shape of 25 to 150 μm.Antibacterial synthetic resin film, (B)With a thickness of 25-150 μmSynthetic resin film, (C) adhesive layer, (D)With a thickness of 25-300 μmAn EMI shielding decorative sheet formed by sequentially laminating an EMI shielding layer and an adhesive layer (E),
Is to provide.
  Moreover, the preferable aspect of this invention is:
(3) The EMI shielding decorative sheet according to items (1) and (2), wherein the antibacterial synthetic resin film of layer (A) is a vinyl chloride resin film containing an antibacterial agent.,
(4) The EMI shielding decorative sheet according to item (2) or (3), wherein the synthetic resin film of layer (B) is a vinyl chloride resin film,
(5) The EMI shielding decorative sheet according to items (1) and (3), wherein the adhesive used for forming the (E) layer is an acrylic pressure-sensitive adhesive,
(6) The EMI shielding decorative sheet according to items (2), (3) and (4), wherein the adhesive used for forming the (C) layer and the (E) layer is an acrylic pressure-sensitive adhesive;
as well as
(7) The (D) layer (1) to (6), wherein the EMI shield layer is a metal foil, a conductive woven or non-woven fabric, a wire mesh, a plastic film having a metal thin film, or a plastic film printed with conductive ink. ) EMI shielding decorative sheet
It is.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
In the decorative sheet of the present invention, an antibacterial synthetic resin film is used as the layer (A). The base resin of this film is not particularly limited as long as it can be used for the surface layer of the decorative sheet. For example, vinyl chloride resin, acrylic resin, olefin resin, styrene resin, ABS resin, polyester Thermoplastic resins such as a series resin can be mentioned. Of these, vinyl chloride resins are particularly preferred because they are excellent in processability, can be controlled in a wide range of flexibility with a plasticizer, and are inexpensive.
Examples of the vinyl chloride resin include vinyl chloride homopolymers or copolymers mainly composed of vinyl chloride, specifically ethylene-vinyl chloride copolymers, vinyl acetate-vinyl chloride copolymers, and the like. Blends with other compatible resins mainly composed of vinyl homopolymers and copolymers (for example, polyester resins, epoxy resins, acrylic resins, vinyl acetate resins, urethane resins, ABS resins, partially saponified polyvinyl alcohol, etc.) Such as things. This vinyl chloride resin may be obtained by any conventional production method such as bulk polymerization, emulsion polymerization, suspension polymerization, and solution polymerization. These vinyl chloride resins may be used alone or in combination of two or more.
In order to impart antibacterial performance to the synthetic resin film of layer (A), a method of incorporating an antibacterial agent into the film is advantageous. There is no restriction | limiting in particular about the antimicrobial agent used in this case, A conventionally well-known organic type antimicrobial agent and an inorganic type antimicrobial agent can be used. Examples of the organic antibacterial agent include alkylene bis thiocyanates such as methylene bis thiocyanate and ethylene bis thiocyanate; 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one 3-isothiazolones such as 4,5-dichloro-2-n-octyl-isothiazolin-3-one, 2-n-octyl-isothiazolin-3-one, and complexes thereof with metal salts; N-methyldithiocarbamine Dithiocarbamate systems such as acid salts, dimethyldithiocarbamate, ethylenebisdithiocarbamate; sulfonamide systems such as N, N-dimethyl-N ′-(fluorodichloromethylthio) -N′-phenylsulfamide; 2- (4 -Thiocyanomethylthio) benzothiazole, 2-me Thiazoles such as sodium rucaptobenzothiazole; 2-bromo-2-nitropropane-1,3-diol, 1,1-dibromo-1-nitro-2-propanol, 2,2-dibromo-2-nitro-1 Organic bromonitro systems such as ethanol, tribromonitromethane, β-bromo-β-nitrostyrene; organic bromocyano systems such as 2,2-dibromo-3-nitrilopropionamide, 2-bromo-2-bromomethyl-glutaronitrile; Organic bromoacetate or amide systems such as 1,2-bis (bromoacetoxy) ethane, 1,2-bis (bromoacetoxy) propane, methylenebisbromoacetate, benzyl bromoacetate, N-bromoacetamide, 2-bromoacetamide; 2-Bromo-4'-hydroxyacetophenone, 2,5-di Halogenated phenols such as olo-4-bromophenol, 2,4,6-trichlorophenol; organic bromosulfones such as bistribromomethylsulfone; hexahydro-1,3,5-tris (2-ethyl) -s- S-triazines such as triazine, hexahydro-1,3,5-tris (2-hydroxyethyl) -s-triazine; N, 4-dihydroxy-α-oxobenzeneethaneimidoyl chloride, α-chloro-o-acetoxy Halogenated oxime systems such as benzaldoxime and α, 4-dichlorobenzaldoxime; Chlorinated isocyanuric acid systems such as sodium dichloroisocyanurate and trichloroisocyanuric acid, decalinium chloride, alkylisoquinolinium bromide, and chloride Quaternary ammonium salts such as benzalkonium; Carbamic acid or its ester system such as methyl imidazolylcarbamate, 3-iodo-2-propargylbutylcarbamic acid; 1- [2- (2,4-dichlorophenyl)]-2 ′-[(2,4-dichlorophenyl) Imidazoles such as methoxy] ethyl-3- (2-phenylethyl) -1H-imidazolium chloride, 1- [2- (2,4-dichlorophenyl) -2- (2-propenyloxy) ethyl] -1H-imidazole Amide systems such as 2- (2-furyl) -3- (5-nitro-2-furyl) acrylic acid amide and 2-chloroacetamide; N- (2-hydroxypropyl) aminomethanol, 2- (hydroxymethylamino); ) Amino alcohols such as ethanol; 2,4,5,6-tetrachloroisophthalonitrile, 5-chloro-2,4,6-tri Halogenated isophthalonitriles such as uroisophthalonitrile; and 3,3,4,4-tetrachlorotetrahydrothiophene-1,1-dioxide, 2-hydroxypropylmethanethiosulfonate, N- (fluorodichloromethylthio) Phthalimide, 3,5-dimethyl-1,3,5-2H-tetrahydrothiadiazine-2-thione, 2-pyridinethiol sodium oxide, 3-acetoxy-1,1,2-triiodo-1-propene, Examples include glutaraldehyde and lauric acid monoglyceride.
[0006]
On the other hand, examples of the inorganic antibacterial agent include phosphate compounds having antibacterial metal ions (copper, silver, zinc, etc.), antibacterial zeolites carrying antibacterial metal ions, and antibacterial metals. Examples include those in which ions are supported on soluble glass.
In the present invention, these antibacterial agents may be used alone or in combination of two or more, and the blending amount is usually 0 as an active ingredient with respect to 100 parts by weight of the resin. The range is 0.01 to 20 parts by weight, preferably 0.1 to 10 parts by weight.
When a vinyl chloride resin is used as the base resin of the synthetic resin film of the layer (A), a plasticizer is used in combination. As this plasticizer, those conventionally used in vinyl chloride resins, for example, dibutyl phthalate, di-n-octyl phthalate, di-2-ethylhexyl phthalate, diisodecyl phthalate, diisononyl phthalate, diundecyl phthalate, trioctyl trimellime. Alkyl esters of aromatic polybasic acids such as tate, triisooctyl trimellitate, alkyl esters of aliphatic polybasic acids such as dibutyl adipate, dioctyl adipate, diisononyl adipate, dibutyl azelate, dioctyl azelate, diisononyl azelate, Phosphoric esters such as tricresyl phosphate and trixylenyl phosphate, polyvalent carboxylic acids such as adipic acid, azelaic acid, sebacic acid and phthalic acid and ethylene glycol, 1,2-propylene The end of a polycondensate having a molecular weight of about 600 to 8000 with a polyhydric alcohol such as ethylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, etc. Examples include polyester plasticizers such as those blocked with an acid, epoxy plasticizers such as epoxidized soybean oil, epoxidized linseed oil, epoxidized tall oil fatty acid-2-ethylhexyl, and chlorinated paraffin.
The amount of the plasticizer is usually selected in the range of 20 to 40 parts by weight, preferably 25 to 35 parts by weight with respect to 100 parts by weight of the vinyl chloride resin. If the blending amount of this plasticizer is less than 20 parts by weight, the film is too hard to be preferred as a surface layer of a decorative sheet, and if it exceeds 40 parts by weight, the film becomes too soft to be preferred as a surface layer, and the plasticizer is bleed. There is a risk of going out.
In order to prepare this antibacterial synthetic resin film, first, when the resin component, antibacterial agent and resin component of the base material are vinyl chloride resins, plasticizers and various additives used as desired, for example, inorganic or organic Fillers, lubricants, heat stabilizers, antioxidants, light stabilizers, flame retardants, colorants, etc. are used in predetermined proportions, respectively, ribbon blender, Banbury mixer, Henschel mixer, super mixer, single screw or twin screw extruder After blending homogeneously using a blender such as a roll or a kneader to prepare a resin blend, it is formed into a film by a known method such as a calendar method, an extrusion molding method, or a solution casting method. Can be created.
[0007]
The thickness of the antibacterial synthetic resin film thus obtained is usually in the range of 50 to 300 μm, preferably 100 to 240 μm, when the synthetic resin film (B) described later is not provided. Moreover, when providing (B) layer, it is 25-150 micrometers normally, Preferably it is the range of 50-120 micrometers.
This antibacterial synthetic resin film may be subjected to surface treatment such as corona treatment, ozone treatment, plasma treatment, etc., as desired, in order to improve printability, etc. Good.
In the decorative sheet of the present invention, a printing layer may be provided as desired for the purpose of imparting design properties. This printed layer may be provided on the back surface of the antibacterial synthetic resin film of the (A) layer, or may be provided on the side in contact with the (A) layer of the synthetic resin film of the (B) layer described later.
This printing layer can be provided by a general printing method such as gravure printing, screen printing, offset printing, flexographic printing, and the like. The ink used in this case is generally a solvent, a colorant such as a pigment or a dye, an extender pigment, and a binder resin, such as vinyl chloride resin, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate copolymer. Combined resin / acrylic resin, polyurethane resin, acrylic resin, chlorinated polypropylene resin, polyester resin, polyamide resin, butyral resin, polystyrene resin, nitrocellulose resin, acetylcellulose resin, etc. Is used. The thickness of this printed layer is usually about 1 to 5 μm.
Examples of the print layer pattern include wood grain, stone grain, cloth grain, natural leather surface pattern, and abstract pattern.
In the decorative sheet of the present invention, a synthetic resin film may be provided as the layer (B) in some cases. Examples of the base resin of the synthetic resin film include various thermoplastic resins exemplified as the base resin of the film of the layer (A). Among these, the processability is excellent and the plasticizer is used. A vinyl chloride resin is particularly preferred from the standpoints that flexibility can be controlled widely and that it is inexpensive.
When a vinyl chloride resin is used as the base resin of the synthetic resin film of the (B) layer, the vinyl chloride resin and the plasticizer used in combination are the antibacterial synthetic resin film of the (A) layer. The same thing as illustrated in description of the vinyl chloride type resin in base resin and the plasticizer used together can be mentioned.
In this case, the blending ratio of the plasticizer is usually 5 to 30 parts by weight, preferably 7 to 25 parts by weight with respect to 100 parts by weight of the vinyl chloride resin. If this amount is less than 5 parts by weight, the film is too hard to be preferred, and if it exceeds 30 parts by weight, the adhesive of the (C) layer to the adhesive layer may be insufficient due to bleed out of the plasticizer.
The film thickness of this (B) layer is 25-150 micrometers normally, Preferably it is the range of 50-120 micrometers. The total thickness of the (A) layer and the (B) layer is usually selected in the range of 50 to 300 μm, preferably 100 to 240 μm. If the thickness of the (A) layer when the (B) layer is not provided, or the total thickness of the (A) and (B) layers is less than 50 μm, wrinkles are likely to occur during the pasting operation, and workability is improved. In addition, there is a risk that inconveniences such as wrinkles tend to occur when each film is formed, or when printing and lamination are performed. On the other hand, when it exceeds 300 μm, the followability to a curved surface is inferior, and the workability tends to be deteriorated.
The film of the layer (B) can be subjected to surface treatment such as corona treatment, ozone treatment, plasma treatment or the like, if desired, in order to improve the printability and the adhesion with the adhesive layer. The film of the layer (A) and the film of the layer (B) are usually laminated by heat fusion.
[0008]
In the decorative sheet of the present invention, an adhesive layer is provided as the (C) layer. The adhesive used to form this (C) layer is not particularly limited, and various types such as acrylic, rubber, silicone, urethane, and polyester can be used. An acrylic pressure-sensitive adhesive having excellent properties is suitable.
This acrylic pressure-sensitive adhesive usually has an alkyl acrylate ester whose alkyl group has about 4 to 15 carbon atoms as a main component, and is copolymerized with a small amount of other monomers and functional monomers. The obtained acrylic resin is included, and examples of the acrylic acid alkyl ester include n-butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, and isononyl acrylate. These may be used alone or in combination of two or more.
Examples of small amounts of other monomers include methyl acrylate, ethyl acrylate, methyl methacrylate, styrene, acrylonitrile, vinyl acetate, and the like. These may be used alone or in combination of two or more.
Examples of the functional monomer include acrylic acid, methacrylic acid, itaconic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, propylene glycol acrylate, acrylamide, methacrylamide, glycidyl acrylate, glycidyl methacrylate, and methacrylic acid. Examples thereof include dimethylaminoethyl and tert-butylaminoethyl methacrylate. These may be used alone or in combination of two or more.
The acrylic pressure-sensitive adhesive is generally classified into a solvent type and an emulsion type. The solvent type contains the acrylic resin, a crosslinking agent, and a tackifier, if desired, in a suitable solvent. On the other hand, the emulsion type contains the acrylic resin, an emulsifier, and, if desired, a tackifier in an aqueous medium.
The thickness of the adhesive layer of this (C) layer is 10-100 micrometers normally, Preferably it is the range of 20-60 micrometers. If the thickness is less than 10 μm, it may be difficult to uniformly apply the pressure-sensitive adhesive to the entire surface, and if it exceeds 100 μm, the adhesive force tends to decrease.
In the decorative sheet of the present invention, an EMI shield layer is provided as the (D) layer. As this EMI shielding layer, for example, metal foil such as iron, stainless steel, aluminum, copper, conductive woven fabric made of metal-plated fibers, conductive nonwoven fabric, metal mesh made of metal fibers, vacuum deposition, sputtering, Examples thereof include a plastic film having a metal thin film on the surface by ion plating, a plastic film coated with a conductive coating agent, and a plastic film printed in a mesh, dot, or solid form with a conductive ink.
In the plastic film having the metal thin film, examples of the metal forming the thin film include aluminum, nickel, chromium, iron, copper, and zinc. On the other hand, examples of the plastic film include polyethylene terephthalate, polyethylene, polypropylene, and poly Examples of the film include vinyl chloride, cellulose acetate, and polymethyl methacrylate. Moreover, as a film in the plastic film printed with conductive ink, the above-exemplified plastic film can be exemplified.
This (D) layer EMI shield layer is formed through the adhesive layer (C) when the (B) layer is provided, but when the (B) layer is not provided, It can be provided by applying a conductive coating agent directly to the back surface of the antibacterial synthetic resin film of the A) layer or printing with a conductive ink.
[0009]
The thickness of the EMI shield layer of the (D) layer is usually in the range of 25 to 300 μm, preferably 50 to 250 μm. If this layer is less than 25 μm, the EMI shielding property may not be sufficiently exhibited, and if it exceeds 300 μm, the decorative sheet becomes too thick and the handleability becomes poor.
In the decorative sheet of the present invention, an adhesive layer is provided as the (E) layer. The adhesive for forming this (E) layer is not particularly limited, and various materials such as acrylic, rubber, silicone, urethane, and polyester can be used. An excellent acrylic pressure-sensitive adhesive is suitable. As this acrylic adhesive, the same thing as what was demonstrated in (C) layer can be mentioned. The thickness of the adhesive layer of this (E) layer is usually 10 to 100 μm, preferably 20 to 60 μm. If the thickness is less than 10 μm, it may be difficult to uniformly apply the adhesive to the entire surface, and if it exceeds 100 μm, the adhesive force tends to be rather lowered.
In the decorative sheet of the present invention, a release sheet is used as necessary. Examples of the release sheet include papers such as glassine paper, coated paper, and laminate paper, and various plastic films coated with a release agent such as a silicone resin. Although there is no restriction | limiting in particular about the thickness of this peeling sheet, Usually, it is about 30-200 micrometers.
Next, the decorative sheet of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of an example of a decorative sheet according to the present invention, in which an antibacterial synthetic resin film 1, a synthetic resin film 2, an adhesive layer 3, an EMI shield layer 4, and an adhesive layer 5 are sequentially laminated. The structure is shown.
[0010]
【Example】
EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
The electromagnetic shielding properties and antibacterial properties of the decorative sheet were determined according to the following methods.
(1) Electromagnetic wave shielding
Based on MIL-STD-285, electromagnetic shielding properties were determined based on a measurement method developed by Advantest.
A hole is made in two sealed spaces, a measurement sample is placed in that part, and a transmitting antenna and a receiving antenna are attached to both sides with a space of 10 mm (distance between the antennas). An electric field wave and a magnetic field wave are transmitted from a transmitting antenna, received by a receiving antenna separated from the sample, and an electric field wave and a magnetic field wave attenuated by passing through the sample are expressed in decibels (db). A spectrum analyzer “TR4172” manufactured by Advantest Corporation and a plastic shield material evaluator “TR17301A” were used as measuring instruments.
(2) Antibacterial
The method for measuring the number of viable bacteria was performed by a film adhesion method.
Bacterial solutions of Escherichia coli, Pseudomonas aeruginosa, and MRSA (Staphylococcus aureus) are dropped onto the surface of the sample (Example 3 is only Escherichia coli and MRSA). Thereafter, the number of viable bacteria after 24 hours was measured. The number of viable bacteria was measured by washing a preserved sample with a SCDLP (Soibean casein lecithin polysorbate 80) medium, and the washed solution was subjected to pour plate culture using a standard agar medium (cultured at 35 ° C. for 48 hours). .
Examples 1-4 and comparative examples
A decorative sheet having the structure shown in Table 1 was prepared, and its electromagnetic shielding properties and antibacterial properties were evaluated. The results are shown in Table 2.
Each decorative sheet was prepared as follows.
(1) The decorative sheet of Example 1
A conductive coating was applied to the antibacterial PVC film 1 by spraying, and after drying, an acrylic pressure-sensitive adhesive (E) was applied to prepare a decorative sheet.
(2) The decorative sheet of Examples 2-4
The antibacterial PVC film 1, 2 or 3 and the PVC film (B) are heat-sealed. On the other hand, after applying acrylic pressure-sensitive adhesive (C) to a woven fabric of aluminum foil or metal-plated fiber and bonding it to the PVC film (B) surface of the heat-sealed laminated film, the opposite side of the bonded surface A decorative sheet was prepared by applying an acrylic pressure-sensitive adhesive (E) to the side.
(3) Comparative decorative sheet
After the PVC film (A ′) and the PVC film (B) were heat-sealed, a decorative sheet was prepared by applying an acrylic pressure-sensitive adhesive (C) to the surface of the PVC film (B).
[0011]
[Table 1]

[0012]
(note)
(A) Antibacterial synthetic resin film
1) Antibacterial PVC film 1: Polyvinyl chloride [Mitsubishi Kasei Vinyl Co., Ltd., trade name: Vinica P510, average polymerization degree 1500] 100 parts by weight, Ion Pure [Ishizuka Glass Co., Ltd., metal ion support Inorganic antibacterial agent] 1 part by weight, 25 parts by weight of dioctyl phthalate, 5 parts by weight of an epoxy plasticizer and 2 parts by weight of a barium zinc stabilizer.
2) Antibacterial PVC film 2: One part by weight of Zeomic [Shinagawa Fuel Co., Ltd., metal ion-supported antibacterial zeolite] and 25 parts by weight of dioctyl phthalate are blended with 100 parts by weight of the above polyvinyl chloride.
3) Antibacterial PVC film 3: Prebentor A3 [manufactured by Bayer, benzimidazole antibacterial agent] 0.3 part by weight, dioctyl phthalate 25 part by weight, epoxy plasticizer 5 part by weight relative to 100 parts by weight of the above polyvinyl chloride And 2 parts by weight of barium zinc stabilizer.
(A ') Synthetic resin film
4) PVC film: A blend of 25 parts by weight of dioctyl phthalate with 100 parts by weight of the above polyvinyl chloride (not including an antibacterial agent).
(B) Synthetic resin film
5) PVC film: A blend of 20 parts by weight of dioctyl phthalate to 100 parts by weight of the above polyvinyl chloride.
(C) Adhesive layer
6) Acrylic pressure-sensitive adhesive: manufactured by Toyo Ink Manufacturing Co., Ltd., trade name: Orbine BPS4891.
(D) Electromagnetic wave shielding layer
7) Woven fabric of metal-plated fiber: 250 μm thick woven fabric made of chrome-plated polyester fiber [trade name: Syntron E-9212, manufactured by Shinto Paint Co., Ltd.]
8) Conductive coating agent: A coating agent composed of a one-component thermoplastic acrylic resin and copper powder [manufactured by Shinto Paint Co., Ltd., trade name: Syntron E-3315].
(E) Adhesive layer
9) Acrylic pressure-sensitive adhesive: manufactured by Toyo Ink Manufacturing Co., Ltd., trade name: Orbine BPS4891.
[0013]
[Table 2]

[0014]
[Table 3]

[0015]
(note)
1) Test bacteria suspension: 1/1000 concentration NB (Nutrient broth) medium-containing phosphate buffer
2) The number of viable bacteria in the dropped bacterial solution was measured and converted per test piece.
3) The same amount of the bacterial solution dripped onto the test piece was dropped into the plastic petri dish, and the polyethylene film was adhered and stored.
4) <10: Means that no bacteria were detected by the bacterial count measurement method used in this test.
As is clear from Table 2, it can be seen that the example in which the EMI shield layer is provided is superior in electromagnetic wave shielding properties as compared with the comparative example in which the EMI shield layer is not provided.
In addition, the example using the polyvinyl chloride film containing the antibacterial agent in the surface layer has superior antibacterial performance compared to the comparative example using the polyvinyl chloride film containing no antibacterial agent. It turns out that it has.
[0016]
【The invention's effect】
The EMI shielding decorative sheet of the present invention can effectively shield electromagnetic waves radiated from electronic devices and the like, has antibacterial performance, and has features such as easy construction and low cost. It is suitably used as a cosmetic for wall surfaces of medical facilities and public facilities.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an example of a decorative sheet of the present invention.
[Explanation of symbols]
1 Antibacterial synthetic resin film
2 Synthetic resin film
3 Adhesive layer
4 EMI shield layer
5 Adhesive layer

Claims (7)

(A) an antibacterial synthetic resin film obtained by molding a resin compound in which an antibacterial agent is blended with a synthetic resin component into a film having a thickness of 50 to 300 μm , (D ) an electromagnetic wave shielding layer having a thickness of 25 to 300 μm And (E) an electromagnetic shielding decorative sheet obtained by sequentially laminating adhesive layers. (A) an antibacterial synthetic resin film obtained by molding a resin blend in which an antibacterial agent is blended with a synthetic resin component into a film shape of 25 to 150 μm , (B) a synthetic resin film having a thickness of 25 to 150 μm , (C) An electromagnetic wave shielding decorative sheet obtained by sequentially laminating an adhesive layer, (D) an electromagnetic wave shielding layer having a thickness of 25 to 300 μm, and (E) an adhesive layer.   The electromagnetic wave shielding decorative sheet according to claim 1 or 2, wherein the antibacterial synthetic resin film of the layer (A) is a vinyl chloride resin film containing an antibacterial agent.   4. The electromagnetic wave shielding decorative sheet according to claim 2, wherein the synthetic resin film of layer (B) is a vinyl chloride resin film.   The electromagnetic wave shielding decorative sheet according to claim 1 or 3, wherein the adhesive used for forming the (E) layer is an acrylic pressure-sensitive adhesive.   The electromagnetic wave shielding decorative sheet according to claim 2, 3 or 4, wherein the adhesive used for forming the (C) layer and the (E) layer is an acrylic pressure-sensitive adhesive.   The electromagnetic wave shielding layer of the layer (D) is a metal film, a conductive woven or non-woven fabric, a wire mesh, a plastic film having a metal thin film, or a plastic film printed with a conductive ink. Electromagnetic shielding decorative sheet.

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