CN112752648A - Radio wave transmitting body - Google Patents

Radio wave transmitting body Download PDF

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Publication number
CN112752648A
CN112752648A CN201980061581.0A CN201980061581A CN112752648A CN 112752648 A CN112752648 A CN 112752648A CN 201980061581 A CN201980061581 A CN 201980061581A CN 112752648 A CN112752648 A CN 112752648A
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CN
China
Prior art keywords
radio wave
layer
transmitting body
metal layer
base material
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Pending
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CN201980061581.0A
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Chinese (zh)
Inventor
小山健史
武藤胜纪
久世淳司
杉浦敦哉
村上淳之介
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Sekisui Chemical Co Ltd
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Sekisui Chemical Co Ltd
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Publication of CN112752648A publication Critical patent/CN112752648A/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C23C14/20—Metallic material, boron or silicon on organic substrates
    • C23C14/205—Metallic material, boron or silicon on organic substrates by cathodic sputtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/0015—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterized by the colour of the layer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/34—Sputtering
    • C23C14/35—Sputtering by application of a magnetic field, e.g. magnetron sputtering

Abstract

The technical problem of the present invention is to provide a radio wave transmitting body having a metallic feeling and a higher saturation degree, and the radio wave transmitting body has a base material, a metal layer, and a color tone adjusting layer, and has a surface resistance of 1.0 × 105Omega/□ or more.

Description

Radio wave transmitting body
Technical Field
The present invention relates to an electric wave transmitting body and the like.
Background
In recent years, electronic devices using radio waves, such as smartphones, have become more closely fitted. As a material of these electronic devices, for example, a material having a radio wave transmittance is required to be used as a material constituting a surface. In addition, in order to increase the added value of the product, design is also required.
As an example of improving the design, a metallic feeling is given by, for example, metallic luster or the like. Conventionally, indium has been used to achieve both metallic feeling and radio wave transmittance. For example, patent document 1 discloses a radar device cover in which an indium layer is disposed on a resin base material.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2008-093241
Disclosure of Invention
Problems to be solved by the invention
The inventors of the present invention, in the course of advancing research, focused on the following facts: the radio wave transmitter obtained by the above technique has a metallic feeling, but has a low saturation and is inferior in design.
Accordingly, an object of the present invention is to provide a radio wave transmitting body having a metallic feeling and a higher saturation.
Means for solving the problems
As a result of earnest studies, the inventors of the present invention have found an electric wave transmitting body having a base material, a metal layer and a color tone adjusting layer, wherein the electric wave transmitting body has a surface resistance of 1.0X 105Omega/□ or more, and is transparent to electric waves having the above characteristicsThe projectile may solve the technical problem. The inventors of the present invention completed the present invention based on the results of further studies of the findings.
Namely, the present invention includes the following aspects.
Item 1 is a radio wave transmitting body having a base material, a metal layer and a color tone adjusting layer, and having a surface resistance of 1.0X 105Omega/□ or more.
Item 2 is the radio wave transmitter according to item 1, wherein the color tone adjustment layer includes a layer containing a metal element and/or a layer containing a metalloid element.
Item 3, the radio wave transmitter according to item 1 or 2, wherein the metal layer is an indium-containing metal layer.
Item 4 is the radio wave transmitting body according to any one of items 1 to 3, wherein a thickness of the metal layer is 70nm or less.
The radio wave transmitter according to any one of items 1 to 4, wherein the color tone adjusting layer comprises silicon, germanium, gallium, zinc, silver, gold, titanium, aluminum, tin, copper, iron, molybdenum, indium, or niobium.
Item 6, the radio wave transmitting body according to any one of items 1 to 5, wherein the degree of saturation is
Figure BDA0002983966930000021
Is 5 or more.
Item 7 is the radio wave transmitting body according to any one of items 1 to 6, wherein lightness L is 35 or more.
Item 8 is the radio wave transmitting body according to any one of items 1 to 7, which includes a base material, a metal layer, and a color tone adjusting layer in this order.
Item 9 is the radio wave transmitting body according to item 8, wherein the elongation recovery rate of the base material is 90 to 100%.
Item 10 the radio wave transmitting body according to item 8 or 9, wherein the base material has a tensile strength of 15 to 50Mpa and a tensile elongation of 300 to 1500%.
An electric wave transmitting body according to any one of items 8 to 10, wherein the base material is a urethane resin base material.
Item 12, the radio wave transmitting body according to any one of items 1 to 7, which has a base material, a color tone adjusting layer, and a metal layer in this order, and which has a surface resistance of 1.0 × 10 on a side surface of the base material and a side surface of the metal layer5Omega/□ or more.
Item 13 is the radio wave transmitter according to item 12, wherein the visible light transmittance of the base material is 80% or more.
Item 14, a decorative cover obtained by disposing the metal layer side surface of the radio wave transmitting body described in item 12 or 13 so as to face the cover.
Effects of the invention
According to the present invention, it is possible to provide a radio wave transmitting body having a metallic feeling and a higher saturation. Further, according to a preferred embodiment of the present invention, a radio wave transmitting body having excellent design properties, specifically, reduced color unevenness can be provided.
Drawings
Fig. 1 is a schematic cross-sectional view showing an example of a radio wave transmitting body 1 of the present invention.
Fig. 2 is a schematic cross-sectional view showing an example of the radio wave transmitting body 2 of the present invention.
Fig. 3 is a schematic cross-sectional view showing an example of a decorative case in which the metal layer side surface of the radio wave transmitter 2 of the present invention is disposed so as to face the case.
Detailed Description
In the present specification, expressions relating to "including" and "comprising" include concepts of "including", "comprising", "substantially comprising" and "only comprising".
One embodiment of the present invention relates to a radio wave transmitting body (hereinafter, referred to as "the radio wave transmitting body of the present invention") having a base material, a metal layer, and a color tone adjusting layer, wherein the radio wave transmitting body has a surface resistance of 1.0 × 105Omega/□ or more (in this specification, it may be referred to as "the present inventionCharacteristic of (d).
The present invention also relates to a radio wave transmitting body (which may be referred to as "the radio wave transmitting body 1" in the present invention) as an embodiment of the radio wave transmitting body of the present invention, which is characterized by comprising a base material, a metal layer, and a color tone adjusting layer in this order, and has a surface resistance of 1.0 × 105Omega/□ or more.
The present invention also relates to a radio wave transmitting body (referred to as "radio wave transmitting body 2" in the present invention) as an embodiment of the radio wave transmitting body of the present invention, which is characterized by comprising a base material, a color tone adjusting layer, and a metal layer in this order, and has a surface resistance of 1.0 × 10 on the base material side surface and the metal layer side surface5Omega/□ or more.
In the radio wave transmitting body of the present invention, the mechanism for imparting color and metallic luster is related to the following elements:
(1) the color filter has an influence of color of the color tone adjusting layer and the metal layer, (2) an influence of light absorption by the color tone adjusting layer, and (3) an influence of optical interference by the color tone adjusting layer and the metal layer.
With the above structure and mechanism, the radio wave transmitter of the present invention has excellent design properties as viewed from the substrate side surface or the surface opposite to the substrate. That is, the radio wave transmitting body 1 of the present invention is excellent in design visible from the surface opposite to the base material, and the radio wave transmitting body 2 of the present invention is excellent in design visible from the surface on the base material side.
The electric wave transmitting body of the present invention will be explained below.
<1. base Material >
The substrate may be a sheet-like material, and is not particularly limited. In the radio wave transmitter 2 of the present invention, as the base material, the surface resistance of the surface of the radio wave transmitter 2 of the present invention on the side of the base material is 1.0 × 105The material in the form of a sheet of material having a Ω/□ or more is not particularly limited. The substrate is not particularly limited, and examples thereof include: resin baseMaterials, rubber substrates, and the like.
The resin base material is a base material containing a resin as a material, and may be in the form of a sheet, and is not particularly limited. The resin base material may contain components other than the resin as long as the effects of the present invention are not significantly impaired. In this case, the total amount of the resin in the resin base material is, for example, 80 mass% or more, preferably 90 mass% or more, more preferably 95 mass% or more, further preferably 99 mass% or more, and usually less than 100 mass%.
The resin is not particularly limited, and examples thereof include: polyester resins (e.g., polyethylene terephthalate (PET), polyethylene naphthalate, modified polyesters, etc.), polyolefin resins (e.g., Polyethylene (PE) resins, polypropylene (PP) resins, polystyrene resins, cycloolefin resins, etc.), vinyl resins (e.g., polyvinyl chloride, polyvinylidene chloride, etc.), polyvinyl acetal resins (e.g., polyvinyl butyral (PVB), etc.), polyether ether ketone (PEEK) resins, Polysulfone (PSF) resins, Polyether Sulfone (PEs) resins, Polycarbonate (PC) resins, polyamide resins, polyimide resins, acrylic resins, triacetyl cellulose (TAC) resins, etc. Among them, polyester-based resins are preferable, and PET and the like are more preferable, from the viewpoint of transparency and strength.
In addition to the above, examples of the resin include: examples of the resin having excellent stretchability include: among them, from the viewpoint of stretchability, elastomers of polyurethane resins, polystyrene resins, polyolefin resins, polyester resins, polyamide resins, and polyvinyl chloride resins are preferable, and polyurethane resins (particularly polyurethane elastomers (TPU)) are particularly preferable. In one embodiment of the present invention, a resin having excellent stretchability can be preferably used for the radio wave transmitting body 1 of the present invention.
The rubber base material is a base material containing rubber as a material, and may be in the form of a sheet, and is not particularly limited. The rubber base material may contain components other than rubber as long as the effects of the present invention are not significantly impaired. In this case, the total amount of the rubber in the rubber base material is, for example, 80 mass% or more, preferably 90 mass% or more, more preferably 95 mass% or more, further preferably 99 mass% or more, and usually less than 100 mass%. The rubber is not particularly limited, and examples thereof include: chloroprene rubber, butadiene rubber, styrene-butadiene rubber, nitrile rubber, isoprene rubber, polyisobutylene rubber, acrylic rubber, fluororubber, ethylene-propylene rubber, silicone rubber, and the like. In one embodiment of the present invention, a rubber base material can be preferably used for the radio wave transmitter 1 of the present invention.
In a preferred embodiment of the present invention, the surface resistance of the radio wave transmitting body is 1.0 × 10 from the viewpoint of sufficiently exhibiting the characteristics of the present invention5The base material (in one embodiment of the present invention, the base material used for the radio wave transmitting body 1 of the present invention) having the characteristics of Ω/□ or more is preferably a base material having excellent stretchability. In one embodiment of the present invention, the surface resistance can be easily adjusted by laminating a metal layer and a color tone adjusting layer on the substrate and then performing a stretching treatment.
As the substrate having excellent stretchability, it is preferable to use a substrate having one or more (preferably all) of the properties of recovery from elongation, tensile strength, and tensile elongation.
From the viewpoints of the elongation recovery rate, the characteristics of the present invention, the design after the stretching treatment, and the like, it is preferably 90 to 100%, more preferably 92 to 98%, and still more preferably 94 to 96%.
The elongation recovery can be measured as follows.
First, a substrate was made into a rectangular sample, and the length (L) in the longitudinal direction was measured0). The sample was placed on a measuring machine (Autograph AGS-1kNX, manufactured by Shimadzu corporation, or an equivalent product thereof) and stretched at a stretching speed of 300mm/min to an elongation of 25%. After that, the stretching was stopped, and the sample was taken out of the tester and the stretching was resumed for 1 minute. Measuring the length L of the substrate after recovery from elongation2The elongation recovery was calculated by the following equation.
Percent recovery from elongation (%) ((L)1-L2)/(L1-L0))×100
In addition, L is1Is a length at 25% elongation (═ 1.25 XL)0)。
The tensile strength is preferably 15 to 50MPa, more preferably 25 to 48MPa, and even more preferably 30 to 45MPa, from the viewpoint of the characteristics of the present invention and the resistance to stretching, for example, the ease of processing a metal film by roll-to-roll (roll) processing.
The tensile strength (tensile strength) is measured according to JIS K7311 in the case of a thermoplastic polyurethane elastomer base material, according to JIS K6251 in the case of a rubber base material, and according to JIS K7127 in the case of another resin base material.
The tensile strength is preferably 300 to 1500%, more preferably 400 to 1000%, and further preferably 500 to 700% from the viewpoints of the characteristics of the present invention, the resistance to stretching treatment, and the ease of processing a metal film by roll to roll (roll).
The tensile strength is measured according to JIS K7311 in the case of a thermoplastic polyurethane elastomer base material, according to JIS K6251 in the case of a rubber base material, and according to JIS K7127 in the case of another resin base material.
The base material (preferably the base material in the radio wave transmitter 2 of the present invention) is preferably a transparent base material from the viewpoint of design visibility.
The visible light transmittance of the base material is preferably 80% or more, more preferably 90% or more, and further preferably 95% or more. The visible light transmittance is usually 100% or less. The design of the radio wave transmitter 2 of the present invention, which is visible from the substrate-side surface, is further improved by the visible light transmittance of the substrate.
The visible light transmittance of the substrate is an average value of measured values obtained when the transmittance in a wavelength range of 380nm to 780nm is measured at intervals of 5 nm. The visible light transmittance can be measured using, for example, a spectrophotometer (e.g., "U-4100" manufactured by Hitachi High-Tech Co., Ltd.). It should be noted that an integrating sphere may be used as the detector volume.
The thickness of the base material is not particularly limited. The thickness of the substrate is, for example, 5 to 500 μm. The thickness is preferably 10 to 200 μm, more preferably 23 to 125 μm, and still more preferably 25 to 100 μm in the radio wave transmitter 1 of the present invention, for example, from the viewpoint of productivity. Alternatively, the thickness is preferably 10 to 200 μm, more preferably 23 to 125 μm, and still more preferably 25 to 100 μm in the radio wave transmitter 2 of the present invention, for example, from the viewpoint of productivity.
The layer structure of the substrate is not particularly limited. The substrate may be composed of only one kind of substrate alone, or may be composed of a combination of two or more kinds of substrates.
<2. Metal layer >
The metal layer is a layer disposed directly on the substrate or provided with another layer interposed therebetween. In the radio wave transmitter 1 of the present invention, the metal layer is a layer disposed between the substrate and the color tone adjusting layer. In the radio wave transmitter 2 of the present invention, the metal layer is a layer disposed on the surface opposite to the base material of the color tone adjusting layer.
The metal layer may be a layer containing a metal as a material, and is not particularly limited. The metal layer may contain a component other than a metal as long as the effect of the present invention is not significantly impaired. In this case, the amount of the metal in the metal layer is, for example, 80 mass% or more, preferably 90 mass% or more, more preferably 95 mass% or more, further preferably 99 mass% or more, and usually less than 100 mass%.
The metal constituting the metal layer is not particularly limited, and examples thereof include: titanium, aluminum, copper, iron, silver, gold, platinum, chromium, nickel, molybdenum, gallium, zinc, tin, niobium, indium, and the like. Among them, aluminum, copper, silver, gold, platinum, titanium, indium, and the like are preferable, and aluminum, copper, titanium, indium, and the like are more preferable, from the viewpoint of adjusting color tone or brightness. The metal may be a single kind, and two or more kinds (e.g., an alloy) may be combined.
In a preferred embodiment of the present invention, the surface resistance of the radio wave transmitting body is 1.0 × 105From the viewpoint of Ω/□ or more, it is preferable to use an indium-containing metal layer as the metal layer. In thatIn one embodiment of the present invention, the surface resistance can be easily adjusted by using an indium-containing metal layer.
The indium-containing metal layer is not particularly limited as long as it is a layer containing indium as a material. The indium-containing metal layer may contain a component other than indium, as long as the effects of the present invention are not significantly impaired. In this case, the amount of the indium element in the indium-containing metal layer is, for example, 25% by mass or more, preferably 50% by mass or more, more preferably 75% by mass or more, further preferably 80% by mass or more, further preferably 90% by mass or more, particularly preferably 95% by mass or more, very preferably 99% by mass or more, and usually less than 100% by mass. By setting the indium content to 25 mass% or more, the durability can be further improved.
The indium-containing metal layer may be composed of indium or an alloy containing indium, or a mixture thereof.
Examples of the metal capable of forming an alloy with indium include: tin, lead, zinc, bismuth, and the like. When an alloy containing indium is used, the melting point is preferably 500 ℃ or less, and the indium content is preferably 25% or more, from the viewpoint of durability.
The metal layer preferably has an island structure.
The island-like structure preferably has an area of 2000nm2Above and 1 μm2The following. At the lower limit, a laminate having more favorable metallic luster and metallic feeling (particularly, metallic luster unique to indium in the case of using an indium metal layer) can be obtained. When the upper limit or less is not more than the above, the high-frequency electromagnetic wave transmissivity becomes further excellent.
The island-like structures have an area of more preferably 2500nm2Above and 250000nm2The following.
From the viewpoint of further improving the transmittance of high-frequency electromagnetic waves, the metal layer preferably has a groove. When the groove is provided, the width of the groove is not particularly limited, and is preferably 0.5nm or more, more preferably 1nm or more, preferably 100nm or less, and more preferably 50nm or less. When the width of the groove is more than the lower limit, the high frequency electromagnetic wave transmittance becomes further excellent. When the width of the groove is below the upper limit, the metal feeling is further improved.
The thickness of the metal layer in the recess is preferably 1nm or less, preferably substantially 0 nm. The island-like structure can be observed, for example, using a scanning electron microscope, and the thickness of the metal layer of the groove portion can be measured, for example, by observing the cross section using a scanning electron microscope.
The thickness of the metal layer is not particularly limited, and is, for example, 1 to 500 nm. From the viewpoint of further improving the saturation of color, the thickness is preferably 5nm or more, more preferably 10nm or more, further preferably 15nm or more, further preferably 25nm or more, and further preferably 35nm or more. From the viewpoint of radio wave transmittance, the thickness is preferably 70nm or less. The thickness can be set in any combination of the upper and lower limits, and is, for example, usually 5 to 70nm, preferably 10 to 50nm, and more preferably 15 to 30 nm.
When the metal layer contains indium, the thickness of the indium-containing metal layer is not particularly limited, and is, for example, 1 to 500 nm. From the viewpoint of further improving the color saturation, the thickness of the radio wave transmitter 1 of the present invention is preferably 5nm or more, more preferably 10nm or more, further preferably 15nm or more, further preferably 25nm or more, and further preferably 35nm or more. From the viewpoint of further improving the color saturation, the thickness of the radio wave transmitter 2 of the present invention is preferably 70nm or less, more preferably 50nm or less, still more preferably 30nm or less, still more preferably 20nm or less, and still more preferably 15nm or less. In this case, the lower limit of the thickness is, for example, 5nm, 10nm, or 15 nm. From the viewpoint of radio wave transmittance, the thickness is preferably 70nm or less. The thickness range can be set by arbitrarily combining the upper and lower limits, and is typically, for example, 5 to 70nm, preferably 10 to 50nm, and more preferably 15 to 30 nm.
When the metal layer is a metal layer containing no indium, the thickness of the metal layer is preferably 5nm or more, more preferably 10nm or more, further preferably 20nm or more, further preferably 40nm or more, and even more preferably 60nm or more, from the viewpoint of ease of production and metallic feeling. From the viewpoint of radio wave transmittance, the thickness is preferably 70nm or less. The thickness range can be set by arbitrarily combining the upper limit and the lower limit, and is usually, for example, 5 to 60nm, preferably 10 to 50nm, and more preferably 20 to 40 nm.
The thickness of the metal layer can be determined by fluorescent X-ray analysis. Specifically, analysis was performed using a scanning fluorescent X-ray analyzer (for example, a scanning fluorescent X-ray analyzer ZSPrimusIII + manufactured by Rigaku corporation or an equivalent product) at an acceleration voltage of 50kV, an acceleration current of 50mA, and an integration time of 60 seconds. The net intensity can be calculated by measuring the X-ray intensity of the K α ray of the metal component to be measured and measuring the intensity of the background position in addition to the peak position. The measured intensity values can be converted to thickness from a pre-made calibration curve. The same sample was analyzed 5 times, and the average value was taken as the average thickness.
The layer structure of the metal layer is not particularly limited. The metal layer may be a single layer composed of a single layer or may be a plurality of layers having the same or different compositions. In addition, the surface of the metal layer may be formed of a coating such as an oxide film on one or both of the main surfaces.
<3. color tone adjusting layer >
The color tone adjusting layer is a layer provided directly on the substrate or provided with another layer interposed therebetween. In the radio wave transmitter 1 of the present invention, the color tone adjusting layer is a layer disposed on the metal layer on the side opposite to the substrate side. In the radio wave transmitter 2 of the present invention, the color tone adjusting layer is a layer disposed between the substrate and the metal layer. The color tone adjusting layer preferably includes a layer containing a metal element and/or a layer containing a metalloid element. In this case, the color tone adjusting layer preferably contains silicon, germanium, gallium, zinc, silver, gold, titanium, aluminum, tin, copper, iron, molybdenum, indium, or niobium, and more preferably silicon.
The color tone adjusting layer preferably includes a layer containing a metalloid element from the viewpoint of radio wave transmissivity.
Preferably, in the radio wave transmitter 2 of the present invention, the color tone adjusting layer does not contain a pigment and/or a dye. When no pigment or dye is contained, the adhesion between the color tone adjusting layer and the substrate and the metal layer can be improved.
When the color tone adjusting layer contains a pigment, the content of the pigment in 100 wt% of the color tone adjusting layer in the radio wave transmitter 2 of the present invention is preferably 0.1 wt% or less, and more preferably 0.01 wt% or less. When the color tone adjusting layer contains a dye, the content of the dye in the radio wave transmitter 2 of the present invention is preferably 0.1 wt% or less, and more preferably 0.01 wt% or less, based on 100 wt% of the color tone adjusting layer. When the content of the pigment or the dye is not more than the upper limit, the adhesion of the color tone adjusting layer to the substrate and the metal layer can be improved.
The layer containing a metal element and the layer containing a metalloid element will be described in detail below.
<3-1. layer containing Metal element >
The layer containing a metal element is disposed on the substrate directly or via another layer. In the radio wave transmitter 1 of the present invention, the layer containing the metal element is disposed on the metal layer on the side opposite to the substrate side. In the radio wave transmitter 2 of the present invention, the layer containing a metal element is disposed between the substrate and the metal layer.
The layer containing a metal element is not particularly limited as long as it contains a metal as a material. The layer containing a metal element may contain a component other than a metal as long as the effect of the present invention is not significantly impaired. In this case, the amount of the metal in the layer containing a metal element is, for example, 80 mass% or more, preferably 90 mass% or more, more preferably 95 mass% or more, further preferably 99 mass%, and usually less than 100 mass%.
The metal constituting the metal element-containing layer is not particularly limited, and examples thereof include: gallium, zinc, silver, gold, titanium, aluminum, tin, copper, iron, molybdenum, indium, niobium, chromium, nickel, and the like. Among them, gallium, zinc, silver, gold, titanium, aluminum, tin, copper, iron, molybdenum, indium, niobium, and the like are preferable from the viewpoint of radio wave transmissivity.
The metal may be a single metal or a combination of two or more metals.
The layer containing a metal element may be composed of a metal or an alloy composed of the metal element, may be composed of a compound containing the metal element, or may be composed of a mixture thereof. As the compound containing a metal element, for example, there are listed: oxides, nitrides, oxynitrides, and the like. In one embodiment of the present invention, the color tone adjusting layer contains a metal oxide and/or a metalloid oxide described below. This can suppress light absorption in the visible light region of the color tone adjustment layer, and can provide a radio wave transmitter having a higher saturation.
As the oxide, for example, MO can be citedX[ wherein X is a number satisfying the following formula: n/100 is more than or equal to X and less than n/2(n is the valence of the metal), and M is a metal element]The compounds represented.
As the nitride, for example, MNy [ in the formula, Y is a number satisfying the following formula: n/100. ltoreq. Y. ltoreq.n/3 (n is the valence of the metal) and M is a metal element.
As the nitrogen oxide, for example, MO can be citedxNy[ wherein X and Y are numbers satisfying the following formula: n/100. ltoreq.X, n/100. ltoreq.Y and X + Y<n/2(n is the valence of the metal), M is a metal element]The compounds represented.
The oxidation valence number X of the oxide or nitride oxide can be calculated, for example, in the following manner. Will contain MOxOr MOxNyThe cross section of the layer(s) of (a) is subjected to elemental analysis by FE-TEM-EDX (for example, "JEM-ARM 200F" manufactured by JEOL Ltd., or its equivalent), and then subjected to elemental analysis by containing MOxOr MOxNyThe element ratio of M and O per unit area of the cross section of the layer (b) is calculated as X, whereby the oxygen atom valence number is calculated.
The nitrogen oxidation valence Y of the nitride or oxynitride can be calculated, for example, in the following manner. A cross section of the layer containing MNy or MOxNy is subjected to elemental analysis by FE-TEM-EDX (for example, "JEM-ARM 200F" manufactured by Japan electronic Co., Ltd., or its equivalent), from the layer containing MNyOr MOxNyThe valence of the nitrogen atom is calculated by calculating Y from the element ratio of M to N per unit area of the cross section of (2).
The layer containing a metal element preferably contains MOxOr MNyLayer (MO)xIn the case of (2), M represents an n-valent metal, and x represents a number of 0 or more and less than n/2. At MNyIn the case of (A), M represents an n-valent metal, and y represents a number of 0 to less than n/3).
The thickness of the layer containing a metal element is not particularly limited, and is, for example, 1 to 200 nm. The thickness is preferably 1 to 100nm, more preferably 3 to 50nm, and still more preferably 5 to 30nm, from the viewpoint of color adjustment, radio wave transmittance, and the like.
The thickness of the layer containing the metal element can be determined by fluorescent X-ray analysis. Specifically, a scanning X-ray fluorescence spectrometer (for example, a scanning fluorescence X-ray analysis apparatus ZSPrimusIII + manufactured by Rigaku corporation or an equivalent product) performs analysis at an acceleration voltage of 50kV, an acceleration current of 50mA, and an integration time of 60 seconds. The net intensity can be calculated by measuring the X-ray intensity of the K α ray of the metal component to be measured and measuring the intensity of the background position in addition to the peak position. The measured intensity values can be converted to thickness from a pre-made calibration curve. The same sample was analyzed 5 times, and the average value was taken as the average thickness.
The layer structure of the layer containing a metal element is not particularly limited. The layer containing a metal element may be a single layer composed of one layer or may be a plurality of layers having the same or different compositions. In addition, in the layer containing a metal element, the surface may be formed of a coating film such as an oxide film in one or both of the two main surfaces.
<3-2 > layer containing metalloid element >
The layer containing a metalloid element is disposed on the substrate directly or via another layer. In the radio wave transmitter 1 of the present invention, the layer containing a metalloid element is disposed on the metal layer on the side opposite to the substrate side. In the radio wave transmitter 2 of the present invention, the layer containing a metalloid element is disposed between the substrate and the metal layer.
The layer containing a metalloid element is not particularly limited, and a layer containing a metalloid element as a material may be used. The layer containing a metalloid element may contain a component other than the metalloid element as long as the effect of the present invention is not significantly impaired. In this case, the content of the metalloid element in the layer containing the metalloid element is, for example, 30% by mass or more, preferably 50% by mass or more, more preferably 75% by mass or more, further preferably 80% by mass or more, further preferably 90% by mass or more, particularly preferably 95% by mass or more, very preferably 99% by mass or more, and usually less than 100% by mass.
The metalloid element constituting the layer containing the metalloid element is not particularly limited, and examples thereof include: silicon, germanium, antimony, boron, phosphorus, bismuth, and the like. Among them, silicon, germanium and the like are preferable from the viewpoint of radio wave transmittance and the like, and silicon is more preferable.
The metalloid element contained most in the layer containing the metalloid element is preferably silicon or germanium.
The metalloid elements may be used alone, or 2 or more kinds thereof may be used in combination.
The metalloid-containing layer may be composed of a metalloid composed of the metalloid or of an alloy, may be composed of a compound containing the metalloid element, and may also be composed of a mixture thereof. As the metalloid element-containing compound, for example, there are listed: oxides, nitrides, oxynitrides, and the like. In one embodiment of the present invention, the color tone adjusting layer contains the metal oxide and/or metalloid oxide. This can suppress light absorption in the visible light region of the color tone adjustment layer, and can thereby obtain a radio wave transmitter having a higher saturation.
Examples of the oxide include: MO (metal oxide semiconductor)X[ wherein X is a number satisfying the following formula: n/100. ltoreq. X < n/2(n is the valence of the metalloid) and M is a metalloid element]The compounds represented.
As the nitride, for example, MNy[ wherein Y is a number satisfying the following formula: n/100 is more than or equal to Y and less than or equal to n/3(n is the valence of metalloid), and M is a metalloid element]The compounds represented.
Examples of the nitrogen oxides include: MO (metal oxide semiconductor)xNy[ wherein X and Y are n/100. ltoreq.X, n/100. ltoreq.Y and X + Y<n/2(n is the valence of the metalloid), M is a metalloid element]The compounds represented.
Regarding the oxidation number X of the oxide or nitride oxide, for example, it can be calculated in the following manner. Will contain MOxOr MOxNyThe cross section of the layer (B) is analyzed by FE-TEM-EDX (for example, "JEM-ARM 200F" manufactured by JEOL Ltd., or its equivalent) to obtain a film containing MOxOr MOxNyThe valence of oxygen atom is calculated by calculating the ratio of the elements X of M and O per unit area of the cross section of the layer (2).
The nitriding number Y of the nitride or oxynitride can be calculated, for example, in the following manner. Will contain MNyOr MOxNyThe cross section of the layer(s) is subjected to elemental analysis by FE-TEM-EDX (e.g., "JEM-ARM 200F" manufactured by JEOL Ltd., or its equivalent), containing MNyOr MOxNyThe element ratio of M to N per unit area of the layer (b) is calculated as Y, and the valence of the nitrogen atom is calculated.
The metalloid-containing layer preferably contains MOxOr MNyLayer (MO)xIn the case of (A), M represents an n-valent metal or metalloid, and x represents a number of 0 or more and less than n/2. In the case of MNy, M represents an n-valent metal or metalloid, and y represents a number of 0 or more and less than n/3). In this case, M is preferably silicon or germanium, respectively.
From the viewpoint of further enhancing the saturation of color, etc., when M in MOx is silicon, X preferably represents less than 1, more preferably 0.5 or less, and still more preferably less than 0.5. When M in MNy is silicon, Y preferably represents a number of 4/3 or less.
The thickness of the layer containing a metalloid element is not particularly limited, for example, 1 to 150 nm. The thickness is preferably 1 to 100nm, more preferably 3 to 50nm, and still more preferably 5 to 30nm, from the viewpoint of enhancing the saturation of color.
The thickness of the layer containing the metalloid element can be determined by fluorescent X-ray analysis. Specifically, analysis was performed using a scanning fluorescent X-ray analyzer (for example, ZSX PrimusIII + or an equivalent product, manufactured by Rigaku corporation) at an acceleration voltage of 50kV, an acceleration current of 50mA, and an integration time of 60 seconds. . The net intensity can be calculated by measuring the X-ray intensity of the K α ray of the metal component to be measured and measuring the intensity of the background position in addition to the peak position. The measured intensity values can be converted to thickness from a pre-made calibration curve. The same sample was analyzed 5 times, and the average value was taken as the average thickness.
The layer structure of the layer containing a metalloid element is not particularly limited. The layer containing a metalloid element may be a single layer composed of one layer or may be a plurality of layers having the same or different compositions. In addition, in the case of the layer containing a metalloid element, the surface may be constituted of a film such as an oxide film on one or both of the two main surfaces.
<4. feature >
The radio wave transmitting body of the present invention is characterized in that the surface resistance thereof is 1.0X 105Omega/□ or more. In particular, the radio wave transmitter 2 of the present invention is characterized in that the surface resistances of the substrate side surface and the metal layer side surface are 1.0 × 105Omega/□ or more. As a result, good radio wave transmittance can be exhibited.
From the viewpoint of radio wave transmittance and the like, the surface resistance is preferably 1.0 × 105～1.0×1012Omega/□, more preferably 1.0X 108～1.0×1010Omega/□. The surface resistance can be measured by a four-terminal method using a surface resistance tester (manufactured by MITOBISHI CHEMICAL ANALYTECH, trade name: Loresta-EP, or trade name: Hiresta-UP).
In the radio wave transmitter 2 of the present invention, the surface resistance of the metal layer side surface is preferably 1.0 × 105～1.0×1012Omega/□, from the viewpoint of radio wave transmittance, more preferably 1.0X 108～1.0×1010Ω/□。
In the radio wave transmitter 2 of the present invention, the surface resistance of the base material side surface is preferably 1.0 × 10 from the viewpoint of radio wave transmissivity or the like5～1.0×1018Omega/□, more preferably 1.0X 108～1.0×1016Omega/□, more preferably 1.0X 1011～1.0×1015Ω/□。
The radio wave transmitter of the present invention has a high saturation. The saturation is preferably 5 or more, more preferably 10 or more, still more preferably 20 or more, and still more preferably 30 or more. The upper limit of the saturation is not particularly limited, and is, for example, 100, 70, or 50. The saturation can be measured from the spectrophotometer by passing through the equation
Figure BDA0002983966930000131
To calculate. (L, a, b) can be measured using a spectrophotometer (U-4100 spectrophotometer manufactured by Hitachi, Ltd., or its equivalent) at 90 degree incidence and 90 degree exposure.
From the viewpoint of metallic appearance, the radio wave transmitting body of the present invention preferably has a high lightness L. The lightness L is preferably 35 or more, more preferably 40 to 80, and further preferably 45 to 70.
The radio wave transmitter of the present invention (preferably, the radio wave transmitter 1 of the present invention) preferably has an elongation recovery rate of 90 to 100%, more preferably 92 to 98%, and still more preferably 94 to 96%.
The elongation recovery can be measured in the same manner as the elongation recovery of the substrate.
The tensile strength of the radio wave transmitter of the present invention (preferably, the radio wave transmitter 1 of the present invention) is preferably 15 to 50MPa, more preferably 25 to 48MPa, and still more preferably 30 to 45 MPa.
The radio wave transmitter of the present invention (preferably, the radio wave transmitter 1 of the present invention) preferably has a tensile elongation of 300 to 1500%, more preferably 400 to 1000%, and further preferably 500 to 700%.
The tensile strength and tensile elongation are values measured according to JIS K7311 in the case where the radio wave transmitter of the present invention has a thermoplastic polyurethane elastomer base material, values measured according to JIS K6251 in the case where the radio wave transmitter has a rubber base material, and values measured according to JIS K7127 in the case where the radio wave transmitter has another resin base material.
<5 > production method
The radio wave transmitting body of the present invention can be obtained, for example, by a method including the following steps in the case of the radio wave transmitting body 1 of the present invention: a step of forming a metal layer on the substrate, and a step of forming a color tone adjusting layer on the metal layer on the side opposite to the substrate. For example, in the case of the radio wave transmitting body 2 of the present invention, it can be obtained by a method including the steps of: a step of forming a color tone adjusting layer on the base material, and a step of forming a metal layer on the color tone adjusting layer on the side opposite to the base material.
The formation is not particularly limited, and may be carried out, for example, by the following method: sputtering, vacuum evaporation, ion plating, chemical evaporation, pulsed laser deposition, and the like. Among them, the sputtering method is preferable from the viewpoint of film thickness controllability.
The sputtering method is not particularly limited, and examples thereof include: DC magnetron sputtering, high-frequency magnetron sputtering, ion beam sputtering, and the like. Further, the sputtering apparatus may be a batch type or a roll-to-roll type.
As described above, in one aspect of the present invention, the surface resistance of the present invention can be easily adjusted by laminating a metal layer and a color tone adjusting layer on a substrate having excellent stretchability and then performing a stretching process. The specific method of the stretching treatment is not particularly limited as long as the characteristics of the present invention can be obtained, and examples of the roll-to-roll method include: nip roll, pressure roll, clover roll, continuous stretch, and the like.
<6 > use
The radio wave transmitting body of the present invention is excellent in design and radio wave transmission, and can be used as a material and a case of various electronic devices using radio waves. As the electronic device, there can be cited: smart phones, tablet terminals, notebook computers, and the like.
<7. decorative housing >
One embodiment of the present invention relates to a decorative cover in which the surface of the radio wave transmitting body 2 of the present invention on the metal layer side is disposed so as to face the case. That is, the present invention relates to a decorative case in which a base material, a color tone adjusting layer, a metal layer, and a case are laminated in this order.
By disposing the metal layer side surface of the radio wave transmitting body 2 of the present invention so as to face the case, the base material side surface faces outward. Thus, the decorative cover of the present invention is excellent in visibility of design and in radio wave transmittance. Further, since the base material side surface of the radio wave transmitter of the present invention serves as a protective layer, the durability is improved.
The material of the case is not particularly limited, and from the viewpoint of radio wave transmittance, resin or glass is preferable.
The metal layer sides and the housing may be laminated by any method. Examples of the lamination method include: by an optically clear adhesive, a laminate of adhesives or bonding agents, or the like.
Examples
Hereinafter, the present invention will be described in detail based on examples, but the present invention is not limited to these examples.
(1) Production of radio wave transmitting body
(example 1)
The substrate (PET film, 50 μm thick) was placed in a vacuum apparatus, and vacuum-evacuated until it became 5.0X 10-4Pa or less. Then, argon gas was introduced, and an In layer (average thickness 15.9nm) was formed as a metal layer on the surface of the substrate by a DC magnetron sputtering method, to obtain a laminate of the substrate and the metal layer.
Placing the laminate of the substrate and the metal layer in a vacuum apparatus, and vacuum-exhausting until the thickness is 5.0X 10-4Pa or less. Subsequently, argon gas was introduced, and an Si layer (average thickness 16.3nm) was formed as a color tone adjusting layer on the surface of the metal layer opposite to the substrate side by a DC magnetron sputtering method, to obtain a radio wave transmitter.
(examples 2 to 10, comparative examples 1 to 5)
A radio wave transmitter was obtained in the same manner as in example 1 except that the thickness of the metal layer, the thickness of the color tone adjusting layer, the thickness of the base material, and the presence or absence of the metal layer were changed as shown in tables 1 and 2.
(example 11)
The substrate (polyurethane elastomer film (TPU, DUS202-CDR 6HF (0.1) manufactured by Seadam Co., Ltd.) was placed in a vacuum apparatus, and vacuum-evacuated to 5.0X 10-4Pa or less. Then, argon gas was introduced, and a Cu layer (average thickness of 28nm) was formed as a metal layer on the surface of the substrate by a DC magnetron sputtering method, to obtain a laminate of the substrate and the metal layer.
The laminate of the substrate and the metal layer was placed in a vacuum apparatus, and vacuum-exhausted to 5.0X 10-4Pa or less. Then, argon gas was introduced, and an Si layer (average thickness 10nm) was formed as a color tone adjusting layer on the surface of the metal layer opposite to the substrate side by a DC magnetron sputtering method, to obtain a laminate.
The laminate was subjected to a stretching treatment, specifically, stretching by a tensile tester until its length in the extending direction was 125%, and then left for 1 minute or more to obtain an electric wave transmitting body.
(examples 12 to 18, comparative examples 6 to 8)
A radio wave transmitting body was obtained in the same manner as in example 11 except that the kind of the base material, the kind of the metal layer, the thickness of the color tone adjusting layer, and the like were changed as shown in table 3. In comparative example 8 alone, the stretching treatment was not performed. In comparative example 7, the film broke due to the stretching treatment.
Details of the substrate different from example 11 are as follows.
Example 14: polypropylene elastomer films (TPU), HF-3071D from Huafon
Example 15: polypropylene elastomer films (TPU), HF-1055AP from the company Huafon
Example 16: polypropylene elastomer films (TPU), HF-4090A from Huafon
Example 17: neoprene sheet, CB260N, manufactured by Xylojin industries Ltd
Example 18: polypropylene film manufactured by Smilon corporation, EC-7520
Comparative example 6: foam sheet (crosslinked polyolefin foam) manufactured by hydropyrogen chemical Co., Ltd, Borara (WL05)
Comparative examples 7 and 8: PET film, A4100(0.05) manufactured by Toyo Boseki K.K
(example 19)
The substrate (PET film, thickness 50 μm, total light transmittance 89%) was placed in a vacuum apparatus, and evacuated to 5.0X 10-4Pa or less. Subsequently, argon gas was introduced to form an Si layer (average thickness 10nm) as a color tone adjusting layer on the surface of the substrate by a DC magnetron sputtering method, to obtain a laminate of the substrate and the color tone adjusting layer.
Placing the laminate of the substrate and the color tone adjusting layer in a vacuum apparatus, and vacuum-exhausting to 5.0X 10-4Pa or less. Subsequently, argon gas was introduced, and an In layer (average thickness of 15nm) was formed as a metal layer on the surface of the color tone adjusting layer on the side opposite to the substrate side by a DC magnetron sputtering method, to obtain an electric wave transmitter.
Examples 20 to 24 and comparative examples 9 to 12
A radio wave transmitting body was obtained in the same manner as in example 19 except that the thickness of the color tone adjusting layer, the thickness of the metal layer, the kind of the substrate, and the property metal layer were changed as shown in table 1.
In comparative example 12, a laminate obtained by sputtering 20nm of aluminum on one surface of a PET film (thickness: 50 μm) was used as a base material. An electric wave transmitter was obtained in the same manner as in example 19 except that an Si layer was formed on the surface on which the aluminum layer was not formed.
(2) Evaluation of
(2-1. measurement of Properties of substrate)
With respect to examples 11 to 18 and comparative examples 6 to 8, the tensile strength, tensile elongation, and elongation recovery (25%) were measured in the following manners.
(2-1-1. tensile Strength, tensile elongation)
The tensile strength and tensile elongation were measured according to JISK7311 for the thermoplastic polyurethane elastomer base material (examples 11 to 16), JISK6251 for the rubber base material (example 17), and JIS K7127 for the other resin base material (example 18, comparative examples 6 to 8).
(2-1-2. stretch recovery)
The substrate was prepared into a sample of 5cm × 10cm, and the length (L) in the longitudinal direction was measured0). The sample was placed on a measuring machine (Autograph AGS-1kNX, manufactured by Shimadzu corporation) and stretched at a stretching speed of 300mm/min until the elongation became 25%. After that, the stretching was stopped, and the sample was taken out of the tester and the stretching was resumed for 1 minute. Measuring the length L of the substrate after recovery from elongation2The elongation recovery was calculated by the following equation.
Percent recovery from elongation (%) ((L)1-L2)/(L1-L0))×100
In addition, L is1Is the length at 25% elongation (═ 1.25 XL)0)。
(2-2. measurement of surface resistance)
The surface resistance of each radio wave transmitting body (surface resistance of the side surface of the color tone adjusting layer in examples 1 to 18 and comparative examples 1 to 8, surface resistance of the side surface of the base material in examples 19 to 24 and comparative examples 9 to 12, and surface resistance of the metal layer side) was measured by a 4-terminal method using a surface resistance meter (trade name: Loresta-EP or trade name: Hiresta-UP manufactured by MITOBISHI CHEMICAL ANALYTECH Co., Ltd.).
(2-3. measurement of L, a, b and saturation)
The obtained radio wave transmitting body was measured for L, a and b by using 90-degree received light obtained by incidence at 90 degrees by a spectrophotometer (spectrophotometer U-4100 manufactured by Hitachi Ltd.), and the saturation was measured by passing through
Figure BDA0002983966930000171
And (4) calculating.
(2-4. evaluation of metallic feeling)
When the surface of each radio wave transmitting body was observed, whether or not it had a metallic feeling was visually confirmed.
The metallic feeling was evaluated according to the following criteria.
Very good: has a metallic feeling.
O: has metal feeling.
X: has no metallic feeling.
(2-5. measurement and evaluation of radio wave transmissivity)
The obtained radio wave transmitting body was measured for its electromagnetic wave shielding property at a frequency of 1MHz to 1000MHz (1 GHz) by a KEC method shield material measurement system (manufactured by Nippon Technos) according to the KEC method, and the measured value was used as the attenuation amount.
The KEC method is a method for measuring and evaluating the electromagnetic wave shielding effect of a material using an electromagnetic wave shielding effect device developed by Kansai Electronic Development Center (Kansai Electronic Development Center).
The electric wave transmittance was evaluated according to the following criteria.
Very good: the amount of attenuation at frequencies of 10MHz, 100MHz and 1000MHz is less than 5 dB.
X: the attenuation amounts under the frequencies of 10MHz, 100MHz and 1000MHz are all above 5 dB.
(2-6. evaluation of designability 1)
When the surfaces of the radio wave transmitting bodies of examples 1 to 18 and comparative examples 1 to 8 were observed, whether or not the design was present was visually confirmed. The designability was evaluated according to the following criteria.
Good: the substrate was not damaged and color unevenness was not observed.
X: substrate cracking or color non-uniformity.
(2-7. evaluation of designability)
From the saturation values of examples 19 to 24 and comparative examples 9 to 12, the designability was evaluated according to the following criteria.
Good: the saturation is 5 or more.
X: the saturation is less than 5.
The results are shown in tables 1 to 4.
Figure BDA0002983966930000191
[ Table 2]
Figure BDA0002983966930000201
Figure BDA0002983966930000211
Figure BDA0002983966930000221
Description of the marks
A substrate
A metal layer
Color tone adjusting layer
An adhesive layer
Shell

Claims (14)

1. A radio wave transmitting body having a substrate, a metal layer and a color tone adjusting layer, the radio wave transmitting body having a surface resistance of 1.0 x 105Omega/□ or more.
2. The radio wave transmitter according to claim 1, wherein said color tone adjusting layer comprises a layer containing a metal element and/or a layer containing a metalloid element.
3. The radio wave transmitter according to claim 1 or 2, wherein said metal layer is an indium-containing metal layer.
4. An electric wave transmitter according to any one of claims 1 to 3, wherein the thickness of said metal layer is 70nm or less.
5. The radio wave transmitter according to any of claims 1 to 4, wherein the color tone adjusting layer comprises silicon, germanium, gallium, zinc, silver, gold, titanium, aluminum, tin, copper, iron, molybdenum, indium, or niobium.
6. Any one of claims 1 to 5The radio wave transmitting body, wherein the saturation
Figure FDA0002983966920000011
Is 5 or more.
7. The radio wave transmitting body according to any one of claims 1 to 6, wherein lightness L is 35 or more.
8. An electric wave transmitter according to any one of claims 1 to 7, comprising a substrate, a metal layer and a color tone adjusting layer in this order.
9. The radio wave transmitting body according to claim 8, wherein the elongation recovery rate of said base material is 90 to 100%.
10. The radio wave transmitting body according to claim 8 or 9, wherein the base material has a tensile strength of 15 to 50Mpa and a tensile elongation of 300 to 1500%.
11. The electric wave transmitter according to any one of claims 8 to 10, wherein the base material is a urethane resin base material.
12. The electrical wave transmitting body according to any one of claims 1 to 7, which has a substrate, a color tone adjusting layer and a metal layer in this order, and the electrical wave transmitting body has a surface resistance of 1.0 x 10 on the substrate side surface and the metal layer side surface5Omega/□ or more.
13. The radio wave transmitter according to claim 12, wherein the visible light transmittance of the base material is 80% or more.
14. A decorative cover obtained by disposing the metal layer side surface of the radio wave transmitting body according to claim 12 or 13 so as to face the cover.
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