JPH0360099A - Film or sheet using metal fiber - Google Patents

Abstract

PURPOSE:To improve electromagnetic wave shielding properties, electrostatic prevention and to improve properties such as uniformity, elasticity, etc., by disposing nonlinear metal long fibers in the sheet or film. CONSTITUTION:A belt 3 is coated with liquidlike polymer composition 1 by a nozzle 2 via a blade 4, etc., in a uniform thickness to provide an adhesive film or sheet 5. Then, metal fiber 7 obtained by a metal fiber manufacturing unit 6 is passed through a metal fiber guide 8 by using curled metal long fiber, and uniformly adhered on the adhesive film or sheet 5 by moving the guide 8 perpendicularly to the advancing direction of the film. Further, the adhesive film or sheet 5 adhered with the fiber 7 is wound on a winding roll 9 at substantially the same speed as the discharging speed of the fiber 7. Then, the film or sheet 5 adhered with the fiber 7 is pressurized by pressurizing means such as pressure rolls 10, etc., wile winding, tilted in a predetermined direction and formed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention has excellent electromagnetic shielding properties, antistatic properties, and decorative properties, and is effective in the fields of electrical and electronic industries, civil engineering and construction, etc. The present invention relates to a metal fiber-containing film or sheet that can be used for.

[Problems to be solved by conventional techniques and inventions] In recent years,
With the spread of electronic devices, the importance of protecting these devices from the harmful effects of electromagnetic waves and static electricity has increased dramatically.

Therefore, conventionally, for example, a film or sheet containing short metal fibers has been used as an electromagnetic shielding metal fiber-containing film or sheet.

However, since this metal fiber-containing film or sheet uses short fibers, it lacks uniformity, and the metal fibers have insufficient contact with each other, resulting in poor electromagnetic shielding properties.

In addition, electromagnetic shielding sheets made of laminated metal thin films have been proposed, but because of their poor elasticity, they have problems such as not being able to adequately handle elongation and being prone to breakage.

[Problems to be Solved by the Invention] The present invention solves these conventional problems and provides a metal fiber-containing film that has excellent electromagnetic wave shielding properties and antistatic properties, and also has excellent properties such as uniformity and elasticity. or for the purpose of providing sheets.

[Means to solve the problem]

That is, the present invention provides a metal fiber-containing film or sheet in which non-linear long metal fibers are present in the sheet or film.

In the present invention, non-linear long metal fibers are used.

There is no particular restriction on the metal fiber as long as it has conductivity, such as steel and stainless steel.

Fibers made of metals such as brass, copper, aluminum, nickel, titanium, and cast iron are used.

Further, long fibers are used as the metal fibers, and the length of the fibers is 10 mm or more, preferably 1100 rf or more. If the length of the metal fibers is less than 10 mm, there will be a lack of uniformity and insufficient contact between the metal fibers, resulting in poor electromagnetic shielding properties and difficulty in forming a continuous sheet.

Further, the diameter of the metal fiber is usually 0.1 to 200 μm, preferably 2 to 50 μm. Here, the diameter of the metal fiber is 0
．． If it is less than 1 μm, the fiber strength will decrease, and it will be easy to break during film/sheet production, making it impossible to impart a sufficient shielding effect to the finished film/sheet. On the other hand, the diameter of the metal fiber exceeds 200 μm. In order to achieve sufficient mutual contact between the metal fibers and the metal fibers, it is necessary to increase the amount of fibers filled, which is undesirable as it increases the weight and reduces the flexibility of the product.

Next, the content of metal fibers present in the sheet or film, in other words, the packing density is about 0.3 to 10 vojJ.

Furthermore, non-linear metal fibers are used. Here, "non-linear" literally means something other than a straight line, and various forms can be considered, but in particular curl,
)-shaped ones are preferable. If straight metal fibers are used here, there will be little contact between the metal fibers and the electromagnetic shielding effect will be poor. In addition, if it is a planar material, it cannot sufficiently follow the tension and has the disadvantages that it requires complicated processes. On the other hand, if a curled material is used, it can sufficiently follow bending and pulling, and it is easy to fill uniformly.
Furthermore, the metal fibers can be brought into sufficient contact with each other, resulting in excellent electromagnetic shielding effects and static electricity prevention effects. Furthermore, when manufacturing a sheet of any width, it is easier to use long metal fibers than to use a planar thin film. In the case of a planar thin film, processing such as cutting it in advance to match the width of the sheet to be manufactured is required, but with metal fibers, the shape can be changed arbitrarily, so there is no need for preprocessing and it can be used as is. I can do it.

In the present invention, it is sufficient that the non-linear long metal fibers as described above are present in the sheet or film, and the manner in which they are present does not matter.

Normally, one or two sheets or films are used, and non-linear long metal fibers are placed on or between them. However, in some cases, non-linear long metal fibers are used as a sheet or A sheet or film formed by placing it on a film forming material and embedding metal fibers by pressing or the like under heat may be used.

Here, various materials can be considered as molding materials for the sheet or film of the present invention. Specifically, for example, various liquid polymer compositions, polyethylene, polypropylene, polystyrene, polyester, boria ξ
Examples include thermoplastic resins such as polyimide, polyimide, and polyvinyl chloride, as well as cloth and paper. Among these, liquid polymer compositions and thermoplastic resins are particularly preferred.

In particular, as described above, curled metal fibers and 1. When a matrix having rubber elasticity such as polybutadiene is combined, the curled portion of the metal fiber can sufficiently follow the elastic deformation of the matrix against bending, tensile, or other forces applied from the outside.

Therefore, the mutual contact between the metal fibers is maintained sufficiently, so that the sheet has excellent conductivity and electromagnetic shielding effect.

On the other hand, when polystyrene, ABS resin, etc. are used as a molding material for a sheet or film, these resins are hard and have poor flexibility, so when made into a sheet or film, it is difficult to withstand external forces such as bending and tension. cannot follow. In particular, when combined with short metal fibers that are normally used as conductive materials, the metal fibers will not come into contact with each other, resulting in insufficient conductivity and electromagnetic shielding effect of the sheet. However, when the curled long metal fibers of the present invention are used, contact between the metal fibers can be maintained to some extent.

Here, there are various types of liquid polymer compositions. For example, there are those typically composed of a hydroxyl group-containing liquid diene polymer or its hydride and a polyisocyanate compound. However, the material is not limited to the above, and liquid elastic bodies such as urethane resin, silicone resin, bi-elastic epoxy resin, etc. may also be used.

In addition, when using a material whose main components are a hydroxyl group-containing liquid diene polymer or its hydride and a polyisocyanate compound, a polyol compound, a boria ξ-ane compound, an inorganic filler, or a curing accelerator may be used as a reinforcing agent, if necessary. Agents may also be added.

In the above liquid polymer composition, the hydroxyl group-containing liquid diene polymer has a hydroxyl group inside or at the end of the molecular chain and has a number average molecular weight of 300 to 25,000, preferably 5.
00-10000 liquid diene polymer. Here, the content of hydroxyl groups is usually 0.1 to 10 meq/g, preferably 0.3 to 7 meq/g.

Examples of the liquid diene polymer include diene polymers and diene copolymers having 4 to 12 carbon atoms, and copolymers of these diene monomers and α-olefinic addition polymerizable monomers having 2 to 22 carbon atoms. There is. Specifically, butadiene homobolymer, isobrene homopolymer, butadiene-styrene copolymer, chlorobrene homopolymer, butadiene-isoprene copolymer, butadiene-acrylonitrile copolymer, butadiene-2-ethylhexyl acrylate copolymer, butadiene-n-octadecyl acrylate copolymer, etc. I can give an example. These liquid diene polymers can be produced, for example, by subjecting a conjugated diene monomer to a heating reaction in the presence of hydrogen peroxide in a liquid reaction medium.

Furthermore, in the present invention, a hydride thereof can be used instead of the hydroxyl group-containing liquid diene polymer. The hydrogenated product of the hydroxyl group-containing liquid diene polymer is prepared by dissolving the hydroxyl group-containing liquid diene polymer in a solvent and heating the mixture at a temperature of 20 to 300 m in the presence of a known hydrogenation catalyst such as nickel, palladium, ruthenium, or platinum. "C1 preferably 30
At ~200°C, hydrogen pressure O ~200 kg/c
fflG, preferably 0 to 100 kg/cnG.
It can be produced by reacting for 1 to 10 hours. After the reaction is completed, the catalyst is filtered off and the solution is distilled under reduced pressure to remove the solvent and obtain a hydride of a hydroxyl group-containing liquid diene polymer. The hydrogenated product of this hydroxyl group-containing liquid diene polymer has a number average molecular weight of 300 to 25,000,
Preferably it is 500-10000, and the hydroxyl group content is 0.1-10 meq/g, preferably 0.3-7 meq/g.
q/g is desirable.

Next, the polyisocyanate compound is an organic compound having two or more isocyanate groups in one molecule, and has an isocyanate group reactive with the hydroxyl group of the hydroxyl group-containing liquid diene polymer. Examples of such polyisocyanate compounds include the usual aromatic, aliphatic and cycloaliphatic ones, such as tolylene diisocyanate (TDI), hexamethylene diisocyanate, diphenylmethane diisocyanate (MDI), carbodiimide-modified diphenylmethane diisocyanate. , polymethylene polyphenylisocyanate, xylylene diisocyanate (XDI
),) lance cyclohexane-1,4-diisocyanate, phenylene diisocyanate, naphthalene-1,5
-diisocyanate, ot-luidine diisocyanate, lysine diisocyanate, triphenylmethane triisocyanate, tris(isocyanate phenyl)thiophosphate, tetramethylxylene diisocyanate, lysine ester triisocyanate, 1.6.11
-Undecane triisocyanate, 1,8-diisocyanate-4-isocyanate methyloctane, 1.3.
6-hexamethylene triisocyanate, bicyclohebutane triisocyanate, isopropylbenzene-2,
4-diisocyanate, trimethylhexamethylene diisocyanate, isophorone diisocyanate (IPDI
), hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, cyclized trimers (isocyanurate modified products) of the above polyisocyanate compounds, ethylene glycol, trimethylolpropane, polyether polyols. Polymer polyols, polytetramethylene ether glycols, polyester polyols.

Addition reaction products of polyol compounds such as acrylic polyols, polyalkadiene polyols, partially oxidized ethylene-vinyl acetate copolymers, and castor oil-based polyols with the above-mentioned polyisocyanate compounds are used. Especially MDI
, carbodiimide-modified diphenylmethane diisocyanate, TDI, and the like are preferred. In addition, these polyisocyanate compounds can be used as a mixture of two or more types, and further, so-called blocked isocyanate compounds in which the isocyanate groups of these polyisocyanate compounds are blocked with a blocking agent such as phenol, xylenol, methyl ethyl ketone oxime, ε-caprolactam, etc. can also be used.

There is no particular restriction on the blending ratio of the hydroxyl group-containing liquid diene polymer or its hydride and the polyisocyanate compound, but usually the polyisocyanate relative to the hydroxyl group (OH) of the hydroxyl group-containing liquid diene polymer or its hydride is The compound is blended so that the ratio of isocyanate groups (NGO) (NGO10H) in the compound is 0.5 to 25, preferably 0.5 to 15 in molar ratio.

Further, as these polyisocyanate compounds, a prepolymer obtained by blending an excess polyisocyanate compound with a hydroxyl group-containing liquid diene polymer can also be used.

Furthermore, as the polyol compound used as a reinforcing agent, any of primary polyol, secondary polyol, and tertiary polyol may be used. Specifically, for example, 1,2-propylene glycol; dipropylene glycol; 112
-butanediol; 1,3-butanediol; 2,3-
Butanediol; 1,2-bentanediol; 2□3-
Bentanediol; 2,5-hexanediol; 2,4
-hexanediol; 2-ethyl-1,3-hexanediol; cyclohexanediol; glycerin, N, N
-bis-2-hydroxypropylaniline, N,N'-
Bishydroxyisopropyl-2-methylpiperazine;
Mention may be made of short chain polyols containing a hydrogen group attached to at least one secondary carbon, such as the propylene oxide adduct of bisphenol A.

Additionally, trimethylolpropane, glycerin.

Mention may be made of short chain triols such as propylene oxide adducts of glycerin. The molecular weight of the short chain polyol compound is in the range of 50-500. The blending ratio of the polyol compound is not particularly limited, but usually the hydroxyl group-containing liquid diene polymer or its hydride 1
0.1 to 100 parts by weight, preferably 0
．． It is 5 to 50 parts by weight.

Furthermore, a polyamine compound, an inorganic filler, and other additives may be added to this liquid polymer as desired.

The polyamine compound may be any of diamine, triamine, and tetraamine. Furthermore, primary polyamine,
Any of the secondary polyamines can be used. Boria fruit compounds include, for example, aliphatic amines such as hexamethylene diamine; alicyclic amines such as 3,3'-dimethyl 4□4'-diaminodicyclohexylmethane; aromatics such as 4,4"-cyagonodiphenyl. Tetramines such as 2.4.6-)su(dimethylaminomethyl)phenol and the like can be mentioned.

There is no particular restriction on the blending ratio of the polyamine compound, but it is usually blended in an amount of 1 to 1000 parts by weight, preferably 3 to 200 parts by weight, per 100 parts by weight of the above-mentioned hydroxyl group-containing liquid diene polymer or its hydride.

Inorganic fillers include zinc, asbestos, alumina, aluminum, kaolin, clay, glass spheres, glass flakes, carbon (Channel Black 2 Furnace Black,
acetylene black, thermal black), kasugoishi,
Cryolite, graphite, silica, wollastonite, diatomaceous earth, zinc oxide, magnesium oxide, zirconium oxide, titanium oxide, iron oxide, aluminum hydroxide, slate powder, zeolite, quartz powder, calcium carbonate, magnesium carbonate, talc, titanium Potassium acid, boron nitride, feldspar powder, copper, nickel, molybdenum disulfide, barium sulfate, whiting, cremica waxite, ceracola, etc. can be mentioned.

There is no particular restriction on the amount of the inorganic filler, but it is usually 1 to 500 parts by weight, preferably 10 to 200 parts by weight, based on 100 parts by weight of the hydroxyl group-containing liquid diene polymer or its hydride.

As other additives added as desired, a plasticizer such as dioctyl phthalate may be added as a viscosity modifier,
Softeners such as aromatic, naphthenic, and paraffinic oils are added, and alkylphenol resins, terpene resins, terpenephenol resins, xylene formaldehyde resins, rosin, hydrogenated rosin, chroman resins, Tackifying resins such as aliphatic and aromatic petroleum resins can also be added. Also, dibutyltin dilaurate, stannous octoate.

Curing accelerators such as polyethylene diamine can also be added. Additionally, anti-aging agents are added to improve weather resistance, and red phosphorus is added as a flame retardant.

Hexabromobenzene and the like can be added.

The liquid polymer composition used as a film or sheet material in the present invention contains the above components.

Obtained by mixing. As a method for preparing a liquid polymer composition, first, the above components except for the polyisocyanate compound are blended, and a 15 to 120"
C1 Preferably at 70-100″C for 5-240 minutes,
Preferably, the mixture is stirred for 30 to 180 minutes, and then the polyisocyanate compound is added to the mixture and the mixture is heated to 0 to 70°.
C1 preferably 0.5#--180 at 15-50'C
A liquid polymer composition is obtained by stirring for minutes, preferably from 1 to 120 minutes.

A method for producing a metal fiber-containing film or sheet of the present invention using a film or sheet made from such a liquid polymer composition will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing the IB method of the method for producing a metal fiber-containing film or sheet of the present invention.

In the figure, reference numeral 1 denotes a liquid polymer composition, which is applied to a uniform thickness onto a belt 3 through a nozzle 2 using a blade 4 or the like to form an adhesive film or sheet 5.

Next, the metal fibers 7 obtained from the metal fiber manufacturing device 6 are passed through the metal fiber guide 8, and the metal fiber guide 8 is moved in a direction perpendicular to the direction of travel of the film, so that the metal fibers 7 are placed on the adhesive film or sheet 5. Apply it evenly. At this time, as shown in FIG. 1, the metal fiber-containing sheet may be covered from above with a film or sheet made of a liquid polymer composition or a thermoplastic resin.

Further, the adhesive film or sheet 5 to which the metal fibers 7 are attached is wound up using a take-up roll 9 or the like at a speed substantially equal to the speed at which the metal fibers 7 are discharged.

Next, while winding up the adhesive film or sheet 5 to which the metal fibers 7 are attached, pressure is applied using a pressure means such as a pressure roll 10, and the film or sheet 5 is bent in a certain direction to be formed.

The curing speed of the liquid polymer composition 1 may be adjusted as appropriate by heating the belt 3, pressure roll 10, etc.

The metal fiber-containing film or sheet formed as described above is wound into a product.

On the other hand, as mentioned above, instead of using a liquid polymer composition, a film or sheet made of a non-adhesive resin (polyethylene, polypropylene, polyester, polyamide, polyimide, polyvinyl chloride, cloth paper, etc.) is used. The method for manufacturing the metal fiber-containing film or sheet of the present invention will be explained with reference to the drawings.

FIG. 2 is an explanatory diagram showing another embodiment of the method for producing a metal fiber-containing film or sheet of the present invention.

First, an adhesive film or sheet 11 is used, the surface of which is coated with a known tackifier by means such as coating.

Next, the metal fibers 7 obtained from the metal fiber manufacturing method W6 are uniformly adhered onto the adhesive film or sheet 11 through the metal fiber guide 8. At this time, another adhesive film or sheet 11 is used in combination to sandwich and encapsulate the metal fibers 7 from above and below.

Furthermore, the adhesive film or sheet 11 containing the metal fibers 7 is wound up using a take-up roll 9 or the like at a speed substantially equal to the speed at which the metal fibers 7 are discharged.

Next, while winding up the adhesive film or sheet 11 containing the metal fibers 7, pressure is applied using a pressure means such as a pressure roll 10 to bend the curled metal fibers in a certain direction to form a bottom shape.

In addition, at this time, the adhesive film or sheet 11 may be plasticized by hot pressing, and the metal fibers 7 may be buried therein.

The metal fiber-containing film or sheet shaped as described above is rolled up into a product.

As mentioned above, curled long metal fibers are preferable as the non-linear long metal fibers, but among these, cutting the end face of a thin metal plate wound into a coil while rotating it is particularly preferred. It is preferable to use curled long metal fibers obtained by. According to this method, continuously connected, curled metal long fibers can be obtained.

By using such curled long metal fibers,
A metal fiber-containing film or sheet can be obtained in which the metal fibers are in sufficient contact with each other and intertwined with each other, and have excellent electromagnetic shielding properties and antistatic properties, as well as being able to sufficiently handle elongation. Such curled long metal fibers can be obtained easily and inexpensively without any loss. In the conventional method, a straight metal fiber obtained from a metal fiber manufacturing device is once wound into a coil using a winding device, and then the metal fiber is taken out from the coil again and impregnated with a resin or the like or made into paper or cloth.

It has been manufactured through a multi-step process of laminating it with a resin or the like, or making it into a composite film or sheet containing metal fibers, such as sand germination. However, in such conventional multi-step process methods, there is a lot of loss of metal fibers in each process, and due to the complexity of the multiple steps and the linearity of the metal fibers, it is difficult for the metal fibers to contact uniformly. It has been difficult to easily and inexpensively produce a film or sheet that spreads while intertwining without loss. In contrast, by using the method described above,
Since the above-mentioned curled long metal fibers can be obtained easily and inexpensively without loss of metal fibers, it is possible to easily and inexpensively produce a film or sheet in which the metal fibers are in uniform contact and spread out while intertwining. can be manufactured.

The metal fiber-containing film or sheet of the present invention is obtained like soft soil.

〔Example〕

Next, examples of the present invention will be shown.

Production example 1 A thin brass plate (thickness 0.01+ma) was wound into a coil shape and cut while rotating at 18 Orpm to a diameter of 10 mm.
μm, and uniformly intertwined curled long fibers were obtained.

Example 1 A metal fiber-containing film was produced using an apparatus as shown in FIG.

The curled long fibers 7 obtained in Production Example 1 were passed through a metal fiber guide 8 to form an adhesive polyester film (polyethylene terephthalate) 1 coated with the adhesive shown in Table 1.
It was made to adhere uniformly on 1.

At this time, another adhesive film 11 obtained in the same manner was used in combination to sandwich and encapsulate the metal fibers 7 from above and below.

Next, the adhesive film 11 containing the curled long fibers 7 is removed at approximately the same speed as the discharge speed of the curled long fibers 7.
It was wound up using a winding roll 9.

Next, while winding up the adhesive film 11 containing the metal fibers 7, pressure is applied using the pressure roll 10, and the curled metal fibers are bent in a certain direction to form a metal fiber-containing film (metal fiber content: 4% by weight). The composition, thickness and film thickness of the adhesive are shown in Table 1.

Table 1 *1 Manufactured by Nijiel Chemical ■, Cauliflex TR1107 *2: Manufactured by Idemitsu Petrochemical ■, Atomave P-100 *3:
Manufactured by Idemitsu Kosan ■, N5-24 *4: Manufactured by Ciba Geigy ■, Irgano Nx 1010 When the electric field shielding effect of the obtained metal fiber-containing film was measured, it showed an electric field shielding of 50 to 5 QdB at a frequency of O to 500 MHz. The effect was recognized.

Examples 2 to 4 Metal fiber-containing sheets were manufactured using an apparatus as shown in FIG.

A liquid polymer composition 1 having the composition shown in Table 2 was applied onto a belt 3 through a nozzle 2 to a uniform thickness using a blade 4 to form an adhesive sheet 5.

Next, the curled long metal fibers 7 obtained in Production Example 1 were uniformly adhered onto the adhesive sheet 5 through the metal fiber guide 8.

Further, the adhesive sheet 5 to which the curled metal long fibers 7 were attached was wound up using a winding roll 9 at a speed substantially equivalent to the discharge speed of the curled metal long fibers 7.

Next, while winding up the adhesive sheet 5 to which the curled long metal fibers 7 are attached, pressure is applied using a pressure roll 10 to form the metal fiber-containing sheet (metal fiber content: 10% by weight). %) was obtained. The composition and sheet thickness of the liquid polymer composition are shown in Table 2.

*1: Manufactured by Idemitsu Atochem ■, R-45HT, number average molecular weight 2800. Hydroxyl group content 0.80 meq/g*2: manufactured by Idemitsu Atochem ■, R-15HT, number average molecular weight 1200.
Hydroxyl group content 1.88 meq/g *3: Idemitsu Atochem ■
manufactured by Epol 2 number average molecular weight 2500. Hydroxyl group content 0
．． 90meq/g*4: Manufactured by Nippon Polyurethane ■, Millionate MTL, liquid modified diphenylmethane diisocyanate, isocyanate group content 28.0% by weight.The electric field shielding effect of the obtained metal fiber-containing sheet was measured and the frequency ranged from 0 to 500MHz. An electric field shielding effect of 50 to 60 dB was observed.

Comparative Examples 1-2 In Examples 2-3, the thickness was 1 mm in the same manner as in Examples 2-3 except that brass long fibers (straight fibers) were used.
metal fiber-containing sheet (metal fiber content: 10% by weight)
I got it.

When the electric field shielding effect of the obtained metal fiber-containing sheet was measured, an electric field shielding effect of 30 to 40 dB was observed at frequencies of 0 to 500 MHz, which was found to be inferior to those of Examples 2 and 3. Ta.

Examples 5-6 The sheets obtained in Examples 2 to 3 were coated vertically.

After applying a load in the lateral direction and stretching it by 30% for 12 hours, we measured the shielding effect of the electric field and found that it was O~500MH.
At frequency No. 2, it showed a value of 50 to 60 dB, which is almost the same value as before applying the load.

Comparative examples 3-4 The sheets obtained in Comparative Examples 1 and 2 were subjected to longitudinal printing.

After applying a load in the lateral direction and stretching it by 30% for 712 hours, we measured the shielding effect of the electric field and found that it was 0 to 500M.
At a frequency of Hz, the shielding effect decreased by 10 to 20 dB.

From the above results, it was found that the curled long metal fiber used in the present invention is effective as a shielding material for t-magnetic waves.

Comparative Example 5 The same procedure as in Example 1 was carried out except that short brass fibers (length 5 mm, diameter IO μm) were used instead of curled long fibers and polyester (polyethylene terephthalate) was used as the matrix resin. A sheet containing short metal fibers (sheet thickness: 1 [111 mm, short metal fiber content: 10% by weight) was obtained.

When the electric field shielding effect of the obtained short metal fiber-containing sheet was measured, the t8 intensity was 0 to 500 MHz.
Attenuation of 25 to 30 dB was observed at the frequency of .

From this, sheets and films that combine curled long fibers with liquid polymer compositions and thermoplastic resins are more effective.
It was found that the electromagnetic wave shielding effect was good.

〔Effect of the invention〕

According to the present invention, a metal fiber-containing film or sheet can be obtained that has excellent electromagnetic shielding properties and antistatic properties, and is also excellent as a decorative material.

In particular, those using curled long metal fibers as the metal fibers have sufficient electromagnetic shielding properties due to their curling and sufficient contact and intertwining.

It has excellent antistatic properties and can sufficiently follow elongation, and this elongation followability can be made good by using an elastic material as the molding material for the film or sheet.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing one embodiment of the method for manufacturing a metal fiber-containing film or sheet of the present invention. FIG. 2 is an explanatory diagram showing another embodiment of the method for producing a metal fiber-containing film or sheet of the present invention. In the figures, the same numbers indicate the same parts. In the figure, symbol l is a liquid polymer composition, symbol 2 is a nozzle, symbol 3 is a belt, symbol 4 is a blade, symbol 5 is an adhesive film or sheet, symbol 6 is a metal fiber manufacturing device, symbol 7 is a metal fiber. , numeral 8 is a metal fiber guide 8, numeral 9 is a take-up roll 9, numeral 10 is a pressure roll 10, numeral 11
is an adhesive film or sheet 1 coated with a tackifier by means such as coating.

Claims (4)

[Claims] (1) A metal fiber-containing film or sheet in which non-linear long metal fibers are present in the sheet or film. (2) The metal fiber-containing film according to claim (1), wherein the non-linear long metal fibers are curled long metal fibers obtained by rotating and cutting a thin metal plate wound into a coil shape. sheet. (3) Claim (1) or (3) wherein the film or sheet is a film or sheet made of a liquid polymer composition.
2) Metal fiber-containing film or sheet as described above. (4) Claim (1) or (2), wherein the film or sheet is a film or sheet made of thermoplastic resin.
Metal fiber-containing film or sheet as described.