JP2010050598A - Metallic luster decoration film for electromagnetic wave-permeable member, and electromagnetic wave-permeable member using the film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamination film for metallic luster electromagnetic wave-permeable member with a reduced environmental load, excellent recycling property, and excellent electromagnetic wave-permeability. <P>SOLUTION: A metallic luster decoration film for the electromagnetic wave-permeable member is used for the electromagnetic wave-permeable member, which includes the lamination film where 30 or more A-layers made of a thermoplastic resin A and 30 or more B-layers made of a thermoplastic resin B are alternately and respectively laminated in the thickness direction, and also where a relative reflection ratio in wavelength bands 400-1,000 nm is ≥30% and ≤90%, both tensile stresses in 100% stretching in the longitudinal and width directions of the film are respectively ≥3 MPa and ≤90 MPa in a tension test at the temperature of 150°C, and the number of the layers where the ratio of the thickness to the layer is ≥10 nm and <220 nm is larger than the number of the layers where the ratio of the thickness to the layer is ≥220 nm and ≤320 nm. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a metal used for an electromagnetic wave transmissive member having excellent metallic permeability while having a metallic luster that can be used for a member such as an exterior of a device that uses an electromagnetic wave such as a communication device or an electromagnetic radar. The present invention relates to a glossy decorative film.

  Generally, antennas that transmit and receive electromagnetic waves, such as communication devices and radars, are given priority in terms of their functions, and the antenna body and surrounding structure are rarely restricted in terms of design. For example, a rod antenna having an exposed antenna shape is used as an antenna for an automobile radio or the like. However, depending on the mounting position of the antenna, it may be desired to hide the antenna. For example, an obstacle in front of an automobile, a radar device that measures the distance between vehicles, and the like are preferably provided at the center of the front of the automobile in order to exhibit its performance. In such a case, the antenna is generally mounted in the vicinity of the front grill of the automobile, and it is desirable to make the antenna as invisible as possible from the design surface.

  Therefore, the emblem and the front grille are used as exterior parts for covering radar equipment, and a metal layer is provided on the exterior parts for covering, realizing a function to protect the radar equipment while ensuring a design with metallic luster. is doing. In addition to the function of receiving the electromagnetic wave of the internal radar device and emitting it to the outside, this exterior component for covering has the function of receiving the electromagnetic wave returned from the detected object and sending it to the receiver, and functions as an antenna.

  The exterior part of the radar device having the metallic luster needs to be hard to attenuate the intensity of the electromagnetic wave in order to prevent erroneous reception of the electromagnetic wave.

  Patent Documents 1, 2, and 3 describe a method for forming a metal layer that easily transmits electromagnetic waves, but the electromagnetic wave permeability is insufficient, the metal used is expensive, Since it is inferior to the processing, it is difficult to form a complicated shape, and it is difficult to form the metal film itself.

Further, Patent Document 4 proposes an electromagnetic wave transmissive member having an uneven shape formed between layers having different refractive indexes and having a metallic luster design without using a metal. Was not enough.
JP 2007-138270 A JP 2004-244516 A JP 2002-135030 A Special table 2004-309322 gazette

  INDUSTRIAL APPLICABILITY The present invention can be used for a member such as an exterior of equipment that uses electromagnetic waves such as communication equipment and electromagnetic radar, and is used for an electromagnetic wave transmissive member that has a metallic luster design and is excellent in electromagnetic wave permeability. It is an object of the present invention to provide an electromagnetic wave transmitting metallic glossy decorative film.

  In order to solve the above problems, the metallic glossy decorative film for an electromagnetic wave transmitting member of the present invention placed in the path of an electromagnetic wave transmitted from an electromagnetic wave transmitter or received by an electromagnetic wave receiver is an A made of a thermoplastic resin A. Layer and thermoplastic resin B are laminated films in which 30 layers or more are alternately laminated in the thickness direction, and the average relative reflectance in the wavelength band of 400 to 1000 nm is 30% or more and 90% or less, and the tensile strength at 150 ° C. In the test, the tensile stress at 100% elongation in the film longitudinal direction and the width direction is 3 MPa or more and 90 MPa or less, and the number of layers having a thickness of 10 nm or more and less than 220 nm is more than the number of layers having a thickness of 220 nm or more and 320 nm or less. It is intended to be a metallic glossy decorative film for many electromagnetic wave transmissive members.

The metallic glossy decorative film for electromagnetic wave transmissive members of the present invention has a high brightness and natural metallic glossy design, is excellent in moldability, and maintains metallic glossy without delamination even after molding. To do.
In addition, the electromagnetic wave transmissive member comprising the metallic glossy decorative film for the electromagnetic wave transmissive member of the present invention is excellent in recyclability and does not cause electromagnetic wave interference, and therefore does not limit the arrangement of the antenna, Since the inorganic thin film layer is not included, circuit design can be easily performed.

  Details of the present invention will be described below.

  The film of the present invention is placed in the path of electromagnetic waves transmitted or received from the electromagnetic wave receiver. Here, the electromagnetic wave refers to a part of infrared rays and a frequency of 3 Hz to 3 THz, and when placed in a path, an electromagnetic wave transmitted from a transmitter close to the film or a receiver close to the film. It means that the electromagnetic wave of the target wavelength is located in the direction in which it is most strongly transmitted or in the direction in which it is most strongly received.

  As shown in FIG. 1, the metallic glossy decorative film for electromagnetic wave transmissive members of the present invention has layers (A layer) 1 made of thermoplastic resin A and layers (B layer) 2 made of thermoplastic resin B alternately. Each includes a structure in which 30 or more layers are stacked.

  The thermoplastic resin A and the thermoplastic resin B may be a homopolymer, or may be a copolymer or a blend of two or more resins. Since the thermoplastic resin A and the thermoplastic resin B can have excellent metallic luster, their refractive indexes are not the same. Desirably, the difference in refractive index between the thermoplastic resin A and the thermoplastic resin B is 0.03 or more. More preferably, the difference in refractive index is 0.05 or more. When a thermoplastic resin is used, extrusion molding is possible and film formability is easy. Further, in the thermoplastic resin, various additives such as an antioxidant, an antistatic agent, a crystal nucleating agent, an inorganic particle, an organic particle, a viscosity reducing agent, and a heat stabilizer are within a range not impairing the object of the present invention. Further, a lubricant, an infrared absorber, an ultraviolet absorber, a dopant for adjusting the refractive index, and the like may be added.

  Examples of thermoplastic resins that can be used in the film of the present invention include polyolefin resins such as polyethylene, polypropylene, polystyrene, and polymethylpentene, alicyclic polyolefin resins, polyamide resins such as nylon 6 and nylon 66, polyethylene terephthalate, and polybutylene. Polyester resins such as terephthalate, polypropylene terephthalate, polybutyl succinate, polyethylene-2,6-naphthalate, poly-1,4-cyclohexanedimethylene terephthalate, polyethylene diphenylate, polycarbonate resin, polyarylate resin, polyacetal resin, polyphenylene sulfide resin Ethylene trifluoride resin / ethylene trifluoride chloride resin, tetrafluoroethylene-6-propylene copolymer, vinylidene fluoride Fluorine resin such as a resin, acrylic resin, methacrylic resin, there can be used polyacetal resins, polyglycolic acid resins, polylactic acid resins, and the like. Of these, polyester is particularly preferred from the viewpoint of strength, heat resistance, and transparency. Polyesters having ethylene terephthalate as a repeating unit are preferable because they are inexpensive and can be used in a wide variety of applications.

  Typical polyesters used in the present invention are homopolyesters and copolymer polyesters which are polycondensates of dicarboxylic acids and diols. Examples of the dicarboxylic acid include terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4′-diphenyldicarboxylic acid, 4,4 Examples include '-diphenylsulfone dicarboxylic acid, adipic acid, sebacic acid, dimer acid, cyclohexanedicarboxylic acid and ester derivatives thereof. Examples of the diol include ethylene glycol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentadiol, diethylene glycol, polyalkylene glycol, 2,2-bis (4′- β-hydroxyethoxyphenyl) propane, isosorbate, 1,4-cyclohexanedimethanol, spiroglycol and the like. Needless to say, these are not only polycondensed in the form of carboxylic acids or alcohols, but can also be converted into polycondensates after being converted into derivatives such as esterified derivatives.

  The thermoplastic resin A of the present invention is polyethylene terephthalate or polyethylene naphthalate, and the thermoplastic resin B is preferably a polyester comprising spiroglycol. Here, the polyester comprising spiroglycol refers to a copolyester copolymerized with spiroglycol, a homopolyester, or a polyester blended with them. Polyesters containing spiroglycol are preferred because they have a small glass transition temperature difference from polyethylene terephthalate or polyethylene naphthalate, so that they are less likely to be overstretched during molding and are also difficult to delaminate. More preferably, the thermoplastic resin A is polyethylene terephthalate or polyethylene naphthalate, and the thermoplastic resin B is preferably a polyester comprising spiroglycol and cyclohexanedicarboxylic acid. If the thermoplastic resin B is a polyester comprising spiroglycol and cyclohexanedicarboxylic acid, a difference in in-plane refractive index from polyethylene terephthalate or polyethylene naphthalate is increased, so that a high reflectance is easily obtained. Moreover, since the glass transition temperature difference with polyethylene terephthalate or polyethylene naphthalate is small and the adhesiveness is excellent, it is difficult to be over-stretched during molding, and is also difficult to delaminate. Moreover, when using cyclohexane dimethanol, it is desirable to make it the ethylene terephthalate polycondensate whose copolymerization ratio is 15 mol% or more and 60 mol% or less. In this way, while having high reflection performance, the change in optical characteristics especially due to heating and aging is small, and peeling between layers is less likely to occur. An ethylene terephthalate polycondensate having a copolymerization amount of cyclohexanedimethanol of 15 mol% or more and 60 mol% or less adheres very strongly to polyethylene terephthalate. In addition, the cyclohexanedimethanol group has a cis or trans isomer as a geometric isomer, and a chair type or boat type as a conformational isomer. In addition, the change in optical characteristics due to thermal history is even less, and blurring during film formation is less likely to occur.

  The intrinsic viscosity of the thermoplastic resin A and the thermoplastic resin B used in the present invention is preferably 0.50 to 1.0 dl / g. More preferably, the lower limit is 0.55 dl / g or more, and still more preferably 0.60 dl / g or more. The upper limit is preferably 0.90 dl / g or less, and more preferably 0.88 dl / g or less. In such a case, the moldability is excellent, and in any molding such as vacuum molding, vacuum pressure molding, plug assist vacuum pressure molding, in-mold molding, insert molding, cold molding, press molding, drawing molding, etc. It becomes easy to form into a shape. In addition, when used as an exterior member, it must be a material that can withstand external shocks and has excellent wear resistance. From such a viewpoint, it is preferable that the intrinsic viscosity of the thermoplastic resin A and the thermoplastic resin B is 0.60 to 0.88 dl / g, and the electromagnetic wave transmission further excellent in wear resistance required as an exterior member. It becomes possible to make a metallic glossy decorative film for an adhesive member.

  Moreover, as a preferable combination of the thermoplastic resin A and the thermoplastic resin B, the absolute value of the difference in SP value between the thermoplastic resin A and the thermoplastic resin B is preferably 1.0 or less. When the absolute value of the difference in SP value is 1.0 or less, delamination hardly occurs.

  As another preferable combination of the thermoplastic resin A and the thermoplastic resin B, the glass transition temperature difference between the thermoplastic resin A and the thermoplastic resin B is preferably 20 ° C. or less. When the glass transition temperature difference is larger than 20 ° C., there is a possibility that the thickness uniformity when the laminated film is formed may be poor, and the appearance of metallic luster may be poor. Moreover, it is because problems such as occurrence of overstretching tend to occur when forming into a laminated film.

In the metallic glossy decorative film for electromagnetic wave transmissive members of the present invention, including a structure in which A layers and B layers are alternately laminated has a structure in which A layers and B layers are alternately laminated in the thickness direction. In addition, in the present invention, a structure in which 30 layers or more of A layers and B layers are alternately laminated in the thickness direction is desirable. More preferably, it is 200 layers or more. Further, the total number of layers of the A layer and the B layer is preferably 600 layers or more. If the A layer and the B layer do not have a structure in which 30 layers or more are alternately stacked in the thickness direction, sufficient reflectance cannot be obtained, and a high-brightness metallic appearance cannot be obtained. Further, when the A layer and the B layer are alternately included in the thickness direction by 200 layers or more, the relative reflectance in the wavelength band of 400 to 1000 nm can be easily set to 40% or more. In addition, when the total number of layers of the A layer and the B layer is 600 layers or more, it becomes easy to set the relative reflectance in the wavelength band of 400 to 1000 nm to 60% or more, and the metal appearance has a very high luminance. It becomes easy. Further, the upper limit value of the number of layers is not particularly limited, but it is 1500 layers or less in consideration of a decrease in wavelength selectivity accompanying a decrease in stacking accuracy due to an increase in the size of the device or an increase in the number of layers. It is preferable.

    In the A layer and the B layer, it is desirable that the in-plane average refractive index of the A layer is relatively higher than the in-plane average refractive index of the B layer. The difference between the in-plane average refractive index of the A layer and the in-plane average refractive index of the B layer is preferably 0.03 or more. More preferably, it is 0.05 or more, More preferably, it is 0.1 or more. When the refractive index difference is smaller than 0.03, a sufficient reflectance cannot be obtained, which is not preferable. Further, when the difference between the in-plane average refractive index and the thickness direction refractive index of the A layer is 0.03 or more, and the difference between the in-plane average refractive index and the thickness direction refractive index of the B layer is 0.03 or less, the incident angle Even if becomes larger, the reflectance of the reflection peak does not decrease, which is more preferable.

  The metallic glossy decorative film for electromagnetic wave transmissive members of the present invention has an average relative reflectance of 30% to 90% in the wavelength band of 400 to 1000 nm. That is, a value obtained by averaging the relative reflectances at wavelengths of 400 to 1000 nm obtained by the relative reflectance measurement method of the present invention is 30% or more and 90% or less. When the average relative reflectance in the wavelength band of 400 to 1000 nm is 30% or more, a high-brightness metallic film can be obtained. As a result, the metallic tone is maintained even after molding, and the color hardly changes depending on the viewing angle. Moreover, when the relative reflectance is 30% or more and 90% or less on the higher wavelength side (700 nm or more) than visible light, for example, the film thickness is reduced by stretching, or the reflection band is shifted to the lower wavelength side depending on the viewing angle. However, the relative reflectance in the visible light region can be maintained between 30% and 90%. More preferably, the relative reflectance in the wavelength band of 400 to 1000 nm is 40% or more. Furthermore, the relative reflectance in the wavelength band of 400 to 1000 nm is preferably 80% or more. The higher the relative reflectance, the higher the brightness of the metallic tone. Moreover, it is more preferable that the relative reflectance in the wavelength band of 400 to 1200 nm is 30% or more and 90% or less. In this case, even if the molding is performed at a higher drawing ratio, coloring or the like hardly occurs and the metallic tone can be maintained. Moreover, it is preferable that the relative reflectance in the wavelength band of 400 to 700 nm in the stretched portion of 1.2 times or more and 2 times or less is 30% or more. When the relative reflectance in the wavelength band of 400 to 700 nm in the stretched portion of 1.2 times or more and 2 times or less is 30% or more, the metallic tone can be maintained without being colored even after molding.

  The metallic glossy decorative film for electromagnetic wave transmissive members of the present invention desirably has a tensile stress of 3 MPa or more and 90 MPa or less at 100% elongation in the film longitudinal direction and width direction in a tensile test at 150 ° C. . In such a case, the moldability is excellent, and in any molding such as vacuum molding, vacuum pressure molding, plug assist vacuum pressure molding, in-mold molding, insert molding, cold molding, press molding, drawing molding, etc. It becomes easy to form into a shape. More preferably, in a tensile test at 150 ° C., the tensile stress at 100% elongation in the film longitudinal direction and in the width direction is 3 MPa or more and 50 MPa or less, respectively. In such a case, molding can be performed even with a higher drawing ratio. In the tensile test at 150 ° C., in order for the tensile stress at 100% elongation in the film longitudinal direction and the width direction to be 3 MPa or more and 90 MPa or less, the thermoplastic resin A is a crystalline resin, and the thermoplastic resin B is preferably an amorphous resin having a bulky group such as a cyclohexanedimethanol unit, a spiroglycol unit, or a neopentylglycol unit. In such a case, since the thermoplastic resin B is hardly oriented and crystallized even after biaxial stretching, the tensile stress is low. It is also preferred that the time required for forming a laminate comprising the A layer and the B layer at the melting point of each resin to cool and solidify is 3 minutes or more. This is presumed that the tensile stress was lowered because the mixed layer formed at the interface between the A layer and the B layer was thick. Furthermore, it is preferable that the layer thickness is 20 nm or less. When the layer thickness is 20 nm or less, the orientation and crystallization are more difficult to proceed even if the layer is stretched, so that the tensile stress is also reduced.

  In the metallic glossy decorative film for electromagnetic wave transmissive members of the present invention, the number of layers having a layer pair thickness of 10 nm or more and less than 220 nm is larger than the number of layers having a layer pair thickness of 220 nm or more and 320 nm or less. By doing in this way, it becomes possible to make the metallic tone almost uncolored. Here, the layer pair thickness is a thickness obtained by adding the layer thicknesses of the adjacent A layer and B layer. The layer pair thickness is obtained by adding the layer thicknesses of the mth A layer counted from one surface for only the A layer and the mth B layer counted from the same surface for only the B layer. Here, m represents an integer. For example, when A1 layer / B1 layer / A2 layer / B2 layer / A3 layer / B3 layer ... are arranged in order from one surface to the opposite surface, the A1 layer and the B1 layer are the first layer. The A2 layer and the B2 layer are the second layer pair, and the A3 layer and the B3 layer are the third layer pair. When the number of layers having a layer pair thickness of 10 nm or more and less than 220 nm is the same as or less than the number of layers having a layer thickness of 220 nm or more and 320 nm or less, the reflectance decreases with decreasing wavelength in the reflection band of the wavelength band 400 to 1100 nm. Since it has a tasteful appearance, it is not preferable. This occurs because the density of the layer pair that causes reflection on the low wavelength side is reduced. Therefore, as an order of the layer pair thickness of the layers constituting the laminated film, the layer pair thickness does not increase or decrease monotonously in a monotonic sequence, but the layer pair thickness in a geometric sequence while satisfying the above conditions. It is preferable to increase or decrease. More preferably, the number of layers having a layer pair thickness of 120 nm or more and less than 220 nm is 1.05 times or more and 2.5 times or less of the number of layers having a layer pair thickness of 220 nm or more and 320 nm or less. In this case, it is possible to obtain a metallic tone without any coloration.

  In the metallic glossy decorative film for electromagnetic wave transmissive members of the present invention, it is desirable that the uneven thickness of the film is 10% or less. More preferably, it is 8% or less. More preferably, it is 5% or less. In such a case, the moldability is excellent, and in any molding such as vacuum molding, vacuum pressure molding, plug assist vacuum pressure molding, in-mold molding, insert molding, cold molding, press molding, drawing molding, etc. It becomes easy to form into a shape. Further, even if the molding is performed at a high drawing ratio, coloring or the like hardly occurs and the metallic tone can be maintained.

  Furthermore, the metallic glossy decorative film for electromagnetic wave transmissive members of the present invention preferably has a layer mainly composed of polyethylene terephthalate or polyethylene naphthalate of 3 μm or more on at least one side by coextrusion. More preferably, it has a layer mainly composed of polyethylene terephthalate or polyethylene naphthalate of 5 μm or more. Further, it is more preferable to have a layer mainly composed of polyethylene terephthalate or polyethylene naphthalate of 3 μm or more on both sides. By providing such polyethylene terephthalate or polyethylene naphthalate of 3 μm or more, it is possible to make it difficult to see the presence of scratches even when the surface is scratched.

  The electromagnetic wave transmitting member used on the path of the electromagnetic wave transmitted from the electromagnetic wave transmitter according to the present invention or received by the electromagnetic wave receiver is a molded body including the metallic glossy decorative film for the electromagnetic wave transmitting member. It is desirable to be. In addition to the metallic glossy decorative film for electromagnetic wave transmissive members of the present invention, it comprises any of a hard coat layer, an embossed layer, a weather resistant layer (UV cut layer), a colored layer, an adhesive layer, a base resin layer, etc. Is also preferable. In such a molded body, all layers can be composed of organic compounds such as resins and inorganic compounds that do not absorb electromagnetic waves, such as silicon oxide, and contain no metals or heavy metals. It does not cause electromagnetic interference. In the existing technology, metal thin film layers such as aluminum are vapor-deposited, etc., but an exterior member utilizing these existing technologies is installed on the electromagnetic wave path of an electromagnetic wave transmitter or electromagnetic wave receiver that requires transmission / reception of electromagnetic waves. If used, the designability may be improved, but there is a possibility that the transmission / reception functions of the transmitter and the receiver that are originally required may be impaired. Therefore, it is desirable that the metallic glossy decorative film for electromagnetic wave transmitting members of the present invention has an electromagnetic wave attenuation rate of 76 dB or less at 76 GHz from the viewpoint of not impairing the function of the millimeter wave radar of an automobile. More preferably, the attenuation rate of electromagnetic waves at 76 GHz is 1.0 dB or less. In such a case, it becomes an electromagnetic wave transmitting member used on the electromagnetic wave path of the millimeter wave radar of an automobile that does not impair the original function even if the metallic glossy decorative film for the electromagnetic wave transmitting member of the present invention is used. Is possible. At this time, the distance between the electromagnetic wave transmissive member and the electromagnetic wave transmitter or electromagnetic wave receiver is preferably within 10 m.

  The metallic glossy decorative film for electromagnetic wave transmissive members of the present invention preferably has a colored layer formed on one surface or both surfaces thereof. Since the metallic glossy decorative film for electromagnetic wave transmissive members of the present invention can be designed to transmit part of visible light, the color of the exterior member can be adjusted by providing a colored layer. It is preferable to provide the colored layer by printing.

  The metallic glossy decorative film for an electromagnetic wave transmissive member of the present invention can be subjected to hairline processing on the surface, and the design can be improved. Hairline processing is a surface processing technique for applying a myriad of fine lines such as hair, and for example, patterns on various lines can be applied to the surface of the film by a method such as a wire brush method or a sand roll paper method. Either method may be used for the metallic glossy decorative film for electromagnetic wave transmissive members of the present invention, and there is no particular limitation. Moreover, the direction which performs a hairline process may be any of the longitudinal direction of the metallic glossy decoration film for electromagnetic wave transmission members of this invention, and the width direction.

  Next, the method for producing a metallic glossy decorative film for an electromagnetic wave transmissive member according to the present invention will be described below with an example. Of course, the present invention is not limited thereto.

  A pellet of thermoplastic resin A and a pellet of thermoplastic resin B dried in hot air or under vacuum are prepared and supplied to separate extruders. In the extruder, the resin melted by heating to a temperature equal to or higher than the melting point is made uniform in the amount of resin extruded by a gear pump or the like, and foreign matter or denatured resin is removed through a filter or the like. It is also possible to extrude the thermoplastic resin A and the thermoplastic resin B while drying with a vent type extruder without drying.

The thermoplastic resin A and the thermoplastic resin B sent out from different flow paths using these two or more extruders are then fed into the multilayer laminating apparatus. As the multilayer laminating apparatus, a multi-manifold die, a feed block, a static mixer, or the like can be used. Moreover, you may combine these arbitrarily. The number of layers having a layer pair thickness of 10 nm or more and less than 220 nm is included, wherein the number of layers having a layer pair thickness of 10 nm or more and less than 220 nm is included. In order to achieve more than the number of layers, it is preferable to use a feed block having at least one member having a large number of fine slits. Furthermore, in order to efficiently obtain the effects of the present invention, it is preferable to use a feed block including at least two members having a large number of fine slits separately. When such a feed block is used, since the apparatus does not become extremely large, there is little foreign matter due to thermal degradation, and high-precision lamination is possible even when the number of laminations is extremely large. Also, the stacking accuracy in the width direction is significantly improved as compared with the prior art. It is also possible to form an arbitrary layer thickness configuration. For this reason, it becomes easy to achieve the following structure which is a preferable aspect of this invention.
a) The total number of layers of the layer made of the thermoplastic resin A (A layer) and the layer made of the thermoplastic resin B (B layer) is 600 layers or more.
b) The relative reflectance in the wavelength band of 400 nm to 1000 nm is 80% or more and 90% or less.
c) The number of layers having a layer pair thickness of 120 to 220 nm is 1.05 to 2.5 times the number of layers having a layer thickness of 220 to 320 nm.
d) At least one side has a layer mainly composed of polyethylene terephthalate or polyethylene naphthalate of 3 μm or more.

  As the shape of the slit, it is preferable that the slit area on the side where the resin is introduced is not the same as the slit area on the side where the resin is not introduced. With such a structure, the flow rate distribution on the side where the resin is introduced and the side where the resin is not introduced can be reduced, so that the laminating accuracy in the width direction is improved. Further, (slit area on the side where no resin is introduced) / (slit area on the side where the resin is introduced) is preferably 0.2 or more and 0.9 or less. More preferably, it is 0.5 or less. Moreover, it is preferable that the pressure loss in a feed block will be 1 Mpa or more. The slit length is preferably 20 mm or more. On the other hand, the thickness of each layer can be controlled by adjusting the gap and length of the slit.

  It is also preferable to have a manifold corresponding to each slit. The manifold makes the flow velocity distribution in the width direction inside the slit uniform, so the lamination ratio in the width direction of the laminated films can be made uniform, and even a large area film can be laminated accurately, The reflectance of the reflection peak can be controlled with high accuracy.

  More preferably, the resin is supplied from one liquid reservoir to two or more slit members. In this way, even if there is a slight flow distribution in the width direction inside the slit, it is further laminated by the confluence apparatus described below, so the total lamination ratio is uniform, It becomes possible to reduce unevenness of the next reflection band.

  In this apparatus, since the thickness of each layer can be adjusted by the shape (length, width) of the slit, any layer thickness can be achieved. On the other hand, in the conventional apparatus, in order to achieve lamination of 300 layers or more, it is common to use a square mixer together. However, in such a method, the lamination flow is deformed and laminated in a similar shape. In addition, it has been difficult to achieve an arbitrary layer thickness. For this reason, it is impossible to accurately and efficiently form a layer structure in which the number of layers having a thickness of 10 nm to 220 nm, which is a feature of the present invention, is larger than the number of layers having a thickness of 220 nm to 320 nm. Met.

Next, in order to set the relative reflectance in the wavelength band of 400 nm to 1000 nm, which is a feature of the present invention, to 30% or more and 90% or less, the layer thickness of each layer is set to at least the wavelength band of 400 nm to 1000 nm based on the following formula 1. It must be designed so that reflection occurs. Further, it preferably includes at least a layer configuration in which the layer pair thickness gradually increases from 120 nm to 320 nm as it goes from one surface to the opposite surface. The reflectance is controlled by the difference in refractive index between the A layer and the B layer and the number of layers of the A layer and the B layer.
2 × (na × da + nb × db) = λ Equation 1
na: In-plane average refractive index of the A layer nb: In-plane average refractive index of the B layer da: Layer thickness (nm) of the A layer
db: Layer thickness of layer B (nm)
λ: main reflection wavelength (primary reflection wavelength) (nm)
Further, in the present invention, the number of layers having a layer pair thickness of 10 nm or more and less than 220 nm must be larger than the number of layers having a layer pair thickness of 220 nm or more and 320 nm or less. Rather than increasing or decreasing in a linear function with respect to the layer pair order, the layer pair thickness change at less than 220 nm may be more gradual than the layer pair thickness change at 220 nm to 320 nm. preferable.

  The molten laminate formed in the desired layer configuration in this way is then formed into a desired shape by a die and then discharged. And the sheet | seat laminated | stacked in the multilayer discharged | emitted from die | dye is extruded on cooling bodies, such as a casting drum, and is cooled and solidified, and a casting film is obtained. At this time, it is preferable to use a wire-like, tape-like, needle-like, or knife-like electrode to be brought into close contact with a cooling body such as a casting drum by an electrostatic force and rapidly solidify. Also preferred is a method in which air is blown out from a slit-like, spot-like, or planar device to be brought into close contact with a cooling body such as a casting drum and rapidly cooled and solidified, or brought into close contact with a cooling body with a nip roll and rapidly solidified.

  The casting film thus obtained is preferably biaxially stretched as necessary. Biaxial stretching refers to stretching in the longitudinal direction and the width direction. Stretching may be performed sequentially in two directions or simultaneously in two directions. Further, re-stretching may be performed in the longitudinal direction and / or the width direction. In particular, in the present invention, it is preferable to use simultaneous biaxial stretching from the viewpoint of suppressing in-plane orientation difference and suppressing surface scratches.

  First, the case of sequential biaxial stretching will be described. Here, stretching in the longitudinal direction refers to stretching for imparting molecular orientation in the longitudinal direction to the film, and is usually performed by a difference in peripheral speed of the roll, and this stretching may be performed in one step. Alternatively, a plurality of roll pairs may be used in multiple stages. Although it changes with kinds of resin as a magnification of extending | stretching, 2 to 15 times is preferable normally, and when polyethylene terephthalate is used for either of the resin which comprises a laminated | multilayer film, 2 to 7 times are used especially preferably. Moreover, as extending | stretching temperature, the glass transition temperature-glass transition temperature +100 degreeC of resin which comprises a laminated | multilayer film are preferable.

  The uniaxially stretched film thus obtained is subjected to surface treatment such as corona treatment, flame treatment, and plasma treatment as necessary, and then functions such as slipperiness, easy adhesion, and antistatic properties are provided. It may be applied by in-line coating.

  The stretching in the width direction refers to stretching for giving the film an orientation in the width direction. Usually, the tenter is used to convey the film while holding both ends of the film with clips, and the film is stretched in the width direction. Although it changes with kinds of resin as a magnification of extending | stretching, 2 to 15 times is preferable normally, and when polyethylene terephthalate is used for either of the resin which comprises a laminated | multilayer film, 2 to 7 times are used especially preferably. Moreover, as extending | stretching temperature, the glass transition temperature-glass transition temperature +120 degreeC of resin which comprises a laminated | multilayer film are preferable.

  The biaxially stretched film is preferably subjected to a heat treatment at a temperature not lower than the stretching temperature and not higher than the melting point in the tenter in order to impart flatness and dimensional stability. After being heat-treated in this way, it is gradually cooled down uniformly, then cooled to room temperature and wound up. Moreover, you may use a relaxation process etc. together in the case of annealing from heat processing as needed.

  Next, the case of simultaneous biaxial stretching will be described. In the case of simultaneous biaxial stretching, the resulting cast film is subjected to surface treatment such as corona treatment, flame treatment, and plasma treatment as necessary, and then, such as slipperiness, easy adhesion, antistatic properties, etc. The function may be imparted by in-line coating.

  Next, the cast film is guided to a simultaneous biaxial tenter, and conveyed while holding both ends of the film with clips, and stretched in the longitudinal direction and the width direction simultaneously and / or stepwise. As simultaneous biaxial stretching machines, there are pantograph method, screw method, drive motor method, linear motor method, but it is possible to change the stretching ratio arbitrarily and drive motor method that can perform relaxation treatment at any place or A linear motor system is preferred. Although the stretching magnification varies depending on the type of resin, it is usually preferably 6 to 50 times as the area magnification. When polyethylene terephthalate is used as one of the resins constituting the laminated film, the area magnification is 8 to 30 times. Is particularly preferably used. In particular, in the case of simultaneous biaxial stretching, it is preferable to make the stretching ratios in the longitudinal direction and the width direction the same and to make the stretching speeds substantially equal in order to suppress the in-plane orientation difference. Moreover, as extending | stretching temperature, the glass transition temperature-glass transition temperature +120 degreeC of resin which comprises a laminated | multilayer film are preferable.

  The film thus biaxially stretched is preferably subsequently subjected to a heat treatment not less than the stretching temperature and not more than the melting point in the tenter in order to impart flatness and dimensional stability. In order to suppress the distribution of the main alignment axis in the width direction during this heat treatment, it is preferable to perform a relaxation treatment in the longitudinal direction immediately before and / or immediately after entering the heat treatment zone. After being heat-treated in this way, it is gradually cooled down uniformly, then cooled to room temperature and wound up. Moreover, you may perform a relaxation | loosening process in a longitudinal direction and / or the width direction at the time of annealing from heat processing as needed. Immediately before and / or immediately after entering the heat treatment zone, a relaxation treatment is performed in the longitudinal direction.

  As an example of a method of obtaining the electromagnetic wave transmissive member of the present invention, after printing on the metallic glossy decorative film for the electromagnetic wave transmissive member of the present invention, the corresponding film and a resin such as acrylic are integrally formed, And a method of integrally molding a three-dimensional molded body having a shape obtained by combining a curved surface or a plurality of flat surfaces with a resin such as styrene sandwiched between the corresponding film.

An evaluation method of physical property values used in the present invention will be described.
(Method for evaluating physical properties)
(1) Relative reflectance A Φ60 integrating sphere 130-0632 (Hitachi Ltd.) and a 10 ° inclined spacer were attached to a spectrophotometer (U-3410 Spectrophotometer) manufactured by Hitachi, Ltd., and the reflectance was measured. The band parameter is set to 2 / servo, the gain is set to 3, and the range from 187 to 2600 nm is set to 120 nm / min. Measured at a detection speed of. In order to standardize the reflectance, an attached Al ₂ O ₃ plate was used as a standard reflecting plate. In the target wavelength range, the reflectance was obtained with a step size of 1 nm. Moreover, the reflectance at each wavelength was averaged to obtain an average relative reflectance.

(2) Unevenness of thickness A film sample cut in the width direction was prepared so that the length in the longitudinal direction was 40 mm, and the thickness in the width direction of the film sample was measured with FILM THICKNESS TESTER made by Anritsu. The maximum value and the minimum value of the measured thickness values were calculated, and the value of (maximum value−minimum value) / ((maximum value + minimum value) / 2) × 100 [%] was determined as the thickness unevenness value.

(3) Intrinsic viscosity Calculated from the solution viscosity measured at 25 ° C in orthochlorophenol. The solution viscosity was measured using an Ostwald viscometer. The unit is [dl / g]. The number of measurements was 3, and the average value was adopted.

(4) Number of layers, layer to thickness Using a scanner (CanonScanD123U manufactured by Canon, Inc.), a cross-sectional image of the film obtained with a transmission electron microscope is used to capture an image with an image size of 720 dpi. Saved as a map file (BMP). Next, the image processing software Image-Pro Plus ver. 4 (manufactured by Media Cybernetics) was used to open the BMP file and perform image analysis. The typical image processing conditions are described below. First, after processing a low-pass filter (size 7 × 7, strength 10, number of times 10), position and luminance numerical data were obtained in the vertical thick profile mode. The position was previously scaled by spatial calibration. This position and luminance data were subjected to sampling step 6 (thinning 6) and three-point moving average processing on Microsoft Excel CEL2000. Further, the obtained luminance was differentiated by position, and the maximum value and the minimum value of the differential curve were calculated. Then, the distance between the positions where the adjacent maximum value-maximum value or the adjacent minimum value-minimum value is set as the layer pair thickness, and all the layer pair thicknesses were calculated. In this case, a constant threshold is set for the differential value so as not to detect the noise of the differential curve, and the distance between adjacent maximum values-maximum values or adjacent minimum values-minimum values corresponding to the layer pair thickness. Processed to detect distance.

(5) Appearance Judging by visual inspection, ◎ if it is a metallic tone without coloring, ○ if it is a metallic tone that is slightly colored, × if it is colored or colored depending on the angle × It was.

(6) Glossiness According to the method defined in JIS-K7105 (1981), the specular glossiness of 60 degrees was measured using a digital variable angle glossiness meter UGV-5D manufactured by Suga Test Instruments. In addition, since glossiness was too high, in the measurement, a filter that was all dimmed to 1/10 was inserted and measured.

(7) Formability Tested using a vacuum forming apparatus SANWA KOGYO PLAVAC TYPE FB-7. A columnar cup having a depth of 15 mm and a diameter of 50 mm was pressed against the sample heated to 200 ° C., and the air in the cup was taken out instantly to make a vacuum. At this time, if the sample was deformed following the shape of the cup, it was judged that the moldability was high, and marked と し た. Moreover, although the sample was deformed following the cup, a sample where the corner portion was not sufficiently formed was rated as “◯”. Further, samples that did not follow the cup and hardly deformed were judged to have low moldability and were evaluated as x.

(8) Attenuation rate of electromagnetic wave The measurement was performed by the free space method, and the attenuation factor of the electromagnetic wave was examined using the transmission loss method. Using a network analyzer (HP8510XF manufactured by Hured Packard), an electromagnetic wave of 76 GHz was incident on a sample having a size of 150 mm × 150 mm, and how much the electromagnetic wave was attenuated was measured three times for one film sample. The average value of the attenuation rate (dB) was adopted.

(9) Tensile stress at 100% elongation at 150 ° C. The tensile stress in the longitudinal direction of the film was cut into 150 mm in the longitudinal direction and 10 mm in the width direction, and the humidity was adjusted in advance for 24 hours in an atmosphere at a temperature of 23 ° C. and a humidity of 65% RH. A film sample was prepared. This sample was subjected to a tensile test under the conditions of an initial length of 50 mm and a tensile speed of 300 mm / min using a Tensilon universal testing machine UTC-100 (manufactured by Orientec Co., Ltd.) in an atmosphere of 150 ° C. according to JIS K7161 and JIS K7127. The tensile stress at 100% elongation was measured. The measurement was performed 5 times in total, and the average value was adopted. About the tensile stress of the film width direction, the sample of width direction 150mm and the longitudinal direction 10mm was cut out, and others were measured similarly to the tensile stress of a longitudinal direction.

(10) Productivity When the cost of one molded product created in Example 1 is 0 times or more and less than 2 times, the cost is ○, and the cost of 2 times or more is × did.

Example 1
1. 100 parts by weight of synthetic dimethyl terephthalate of polyester 1, 17.4 parts by weight of dimethyl 1,4-cyclohexanedicarboxylate having a cis / trans ratio of 72/28, 64 parts by weight of ethylene glycol, and 20 parts by weight of spiro glycol Then, 0.04 part by weight of manganese acetate tetrahydrate and 0.02 part by weight of antimony trioxide were weighed and charged into a transesterification reactor. The contents were dissolved at 150 ° C. and stirred. Subsequently, methanol was distilled while slowly raising the temperature of the reaction contents to 235 ° C. while stirring. After distillation of a predetermined amount of methanol, an ethylene glycol solution containing 0.02 part by weight of trimethyl phosphoric acid was added. After adding trimethyl phosphoric acid, the mixture was stirred for 10 minutes to complete the transesterification reaction. Thereafter, the transesterification reaction product was transferred to a polymerization apparatus.

Next, the content of the polymerization apparatus was stirred and the pressure was reduced and the temperature was raised, and polymerization was carried out while distilling ethylene glycol. The reduced pressure was reduced from normal pressure to 133 Pa or less over 90 minutes, and the temperature was raised from 235 ° C. to 285 ° C. over 90 minutes. When the stirring torque of the polymerization apparatus reached a predetermined value, the inside of the polymerization apparatus was returned to normal pressure with nitrogen gas, the valve at the bottom of the polymerization apparatus was opened, and a gut-shaped polymer was discharged into the water tank. The polyester gut cooled in the water tank was cut with a cutter to obtain chips, and crystalline polyester 1 was obtained.
The obtained polyester 1 had an intrinsic viscosity of 0.65 dl / g and a Tg of 80 ° C.

2. Similarly to the synthesis of polyester 2, polyester 2 was polymerized in the same manner as described above except that 67.6 parts by weight of dimethyl terephthalate and 54 parts by weight of ethylene glycol were used. The obtained polyester 2 had an intrinsic viscosity of 0.72 dl / g. The dicarboxylic acid component of this polyester 2 was 80 mol% terephthalic acid and 20 mol% cyclohexanedicarboxylic acid. Moreover, the diol component of the polyester 2 was 85 mol% of ethylene glycol and 15 mol% of spiroglycol. Polyester 2 was amorphous.

3. Production of Film Next, synthesized polyester 1 and polyester 2 were prepared as two types of thermoplastic resins constituting the metallic glossy decorative film for electromagnetic wave transmissive members of the present invention. 0.04 wt% of aggregated silica particles having an average secondary particle size of 1 μm and 199.46 wt% of polyester, 8.5 wt% of malonate ester UV absorber (“Sanduboa B-CAP” manufactured by Clariant Japan) %, And this was designated as thermoplastic resin A. Next, polyester 2 was used as thermoplastic resin B. These thermoplastic resin A and thermoplastic resin B were dried and then supplied to separate extruders.

  Each of the thermoplastic resin A and the thermoplastic resin B was melted at 280 ° C. with an extruder, passed through a gear pump and a filter, and then merged in a 801-layer feed block. The laminating apparatus in the 801-layer feed block was composed of three slit members having 267 slits. The merged thermoplastic resins A and B are changed so that the thickness of each layer gradually increases from the surface side to the opposite surface side in the feed block. The thermoplastic resin A is 401 layers, and the thermoplastic resin B is It was set as the structure laminated | stacked alternately in the thickness direction which consists of 400 layers. The slit shapes were adjusted so that both surface layer portions were the thermoplastic resin A, and the layer thicknesses of the adjacent A layer and B layer were substantially the same. In this design, a reflection band exists at 400 to 1200 nm. The laminate composed of the total of 801 layers thus obtained is supplied to the multi-manifold die, and the surface layer of the thermoplastic resin A supplied from another extruder is set to a final thickness of 990 μm. After forming into a sheet shape, it was rapidly cooled and solidified on a casting drum maintained at a surface temperature of 25 ° C. by electrostatic application. The flow path shape and the total discharge amount were set so that the time from the joining of the thermoplastic resin A and the thermoplastic resin B in the laminating apparatus to the rapid solidification on the casting drum was about 8 minutes.

  The obtained cast film was heated with a roll group set at 75 ° C., and then stretched 3.0 times in the longitudinal direction while rapidly heating from both sides of the film with a radiation heater between 100 mm in the stretch section length. Cooled down. Subsequently, both sides of this uniaxially stretched film were subjected to corona discharge treatment in air, the wetting tension of the base film was set to 55 mN / m, and the treated surface (polyester resin having a glass transition temperature of 18 ° C.) / (Glass transition) Polyester resin having a temperature of 82 ° C.) / Laminate-forming film coating liquid composed of silica particles having an average particle diameter of 100 nm was applied to form a transparent, easy-sliding, and easy-adhesion layer.

  This uniaxially stretched film was guided to a tenter, preheated with hot air at 100 ° C., and stretched 3.3 times in the transverse direction at a temperature of 110 ° C. The stretched film was directly heat-treated in a tenter with hot air of 240 ° C., then subjected to a relaxation treatment of 8% in the width direction at the same temperature, and then gradually cooled to room temperature and wound up. The thickness of the obtained film was 100 μm, and the thickness unevenness was 4.0%. The metallic glossy decorative film for electromagnetic wave transmissive members obtained here is designated as 3. The obtained results are shown in the film properties of Table 1.

4). Post-processing and molding Next, an automobile emblem (electromagnetic wave transmissive member) used on an electromagnetic wave path of a millimeter wave radar of an automobile was produced using the film obtained by the method described in the above item 3. Transparent print layers were printed on both sides of the film. At this time, a printed layer using a black ink that does not transmit light was further provided in a portion that did not show a metallic luster. The film with the printed layer is formed integrally with polymethyl methacrylate (PMMA), and then formed with acrylonitrile, ethylene, styrene (AES), and the automobile emblem is laminated with the film with the printed layer. Obtained. A part of the cross section of the emblem for automobiles is shown in FIG. The obtained results are shown in Table 1.

(Example 2)
Instead of the thermoplastic resin B in Example 1, polyethylene terephthalate copolymerized with 30 mol% of cyclohexanedimethanol with respect to ethylene glycol [PETG6763 manufactured by Eastman, intrinsic viscosity 0.85 dl / g] (polyester 3) was used. In addition, the polyethylene terephthalate which copolymerized 30 mol% of cyclohexanedimethanol with respect to ethylene glycol was an amorphous resin. Other conditions and devices were the same as in Example 1. The thickness of the obtained film was 100 μm, and the uneven thickness of the film was 4.3%. The obtained results are shown in the film properties of Table 1. Next, an automobile emblem was prepared using the metallic glossy decorative film for electromagnetic wave transmissive member obtained here. Other conditions and devices were the same as in Example 1. The obtained results are shown in Table 1.

(Example 3)
In Example 1, the same conditions and apparatus were used except that the feed block was changed. The feed block used was a 201-layer feed block consisting of one slit member having 201 slits. The joined thermoplastic resin A and thermoplastic resin B are changed so that the thickness of each layer gradually increases from the surface side to the opposite surface side in the feed block, and the thermoplastic resin A is 101 layers. It was set as the structure by which resin B was laminated | stacked alternately in the thickness direction which consists of 100 layers. Here, the shape of each fine slit in the feed block was adjusted so that the layer pair thickness on the thin side was relatively increased as in Example 1. Moreover, the slit shape was designed so that both surface layer parts might become the thermoplastic resin A, and the layer thickness of the adjacent A layer and B layer became substantially the same. The thickness of the obtained film was 25 μm, and the uneven thickness of the film was 4.8%. The obtained results are shown in the film properties of Table 1. Next, an automobile emblem was prepared using the metallic glossy decorative film for electromagnetic wave transmissive member obtained here. Other conditions and devices were the same as in Example 1. The obtained results are shown in Table 1.

(Comparative Example 1)
A biaxially stretched film was made using only the thermoplastic resin A in Example 1, and aluminum was deposited on one side with a thickness of 0.06 μm. The thickness of the obtained film was 25 μm including the aluminum vapor deposition layer. The obtained results are shown in the film properties of Table 1. Next, in the car emblem, the inner side and outer side moldings are created separately in advance, aluminum deposition is applied to the outer side molding, and the inner side and outer side moldings are pasted after black coating is applied. An automobile emblem was produced. The obtained results are shown in Table 1.

(Comparative Example 2)
Using only the thermoplastic resin A in Example 1, a biaxially stretched film was formed, and indium was deposited on one side with a thickness of 0.06 μm. The thickness of the obtained film was 25 μm including the indium vapor deposition layer. The obtained results are shown in the film properties of Table 1. Next, in the car emblem, the inner side and outer side moldings are created separately in advance, aluminum deposition is applied to the outer side molding, and the inner side and outer side moldings are pasted after black coating is applied. An automobile emblem was produced. The obtained results are shown in Table 1.

(Comparative Example 3)
In Example 3, the flow path shape and the total discharge amount are set so that the time from the joining of the thermoplastic resin A and the thermoplastic resin B in the laminating apparatus to the rapid cooling and solidification on the casting drum is about 1 minute. Set. The longitudinal draw ratio was 3.6 times, and the transverse draw ratio was 3.9 times. Other conditions and devices were the same as in Example 3. The thickness of the obtained film was 25 μm, and the thickness unevenness was 4.7%. The obtained results are shown in Table 1. Next, an emblem for an automobile was produced using the film obtained here. Other conditions and devices were the same as in Example 1. The obtained results are shown in Table 1.

(Comparative Example 4)
In Example 1, the same conditions and apparatus as in Example 1 were used except that the feed block was changed. The feed block used was a 57-layer feed block consisting of one slit member having 57 slits. The joined thermoplastic resin A and thermoplastic resin B are changed so that the thickness of each layer gradually increases from the surface side to the opposite surface side in the feed block, and the thermoplastic resin A has 29 layers. It was set as the structure where resin B was laminated | stacked alternately in the thickness direction which consists of 28 layers. Here, the shape of each fine slit in the feed block was adjusted so that the layer pair thickness on the thin side was relatively increased as in Example 1. Moreover, the slit shape was adjusted so that both surface layer parts might become the thermoplastic resin A, and the layer thickness of the adjacent A layer and B layer became substantially the same. The thickness of the obtained film was 8 μm, and the thickness unevenness was 4.5%. The obtained results are shown in the film properties of Table 1. This laminated film was a film that was not transparent in metallic appearance and nearly transparent. An automotive emblem was not produced using this laminated film.

The present invention relates to a metallic glossy decorative film for an electromagnetic wave transmissive member in which layers made of at least two kinds of thermoplastic resins are laminated. More specifically, the present invention relates to a laminated film suitable as a metallic glossy decorative film for a mobile phone electromagnetic wave transmitting member.

The schematic diagram which shows a part of laminated structure of the film of this invention Schematic showing a part of the cross-sectional structure of an automobile emblem

Explanation of symbols

1 Layer made of thermoplastic resin A (A layer)
2 Layer made of thermoplastic resin B (B layer)
3 Metallic glossy decorative film for electromagnetic wave transmissive member of the present invention 4 Print layer

Claims (8)

A film used for an electromagnetic wave transmitting member that is placed in a path of an electromagnetic wave that is transmitted from an electromagnetic wave transmitter or received by an electromagnetic wave receiver, wherein the film comprises an A layer made of thermoplastic resin A and a thermoplastic resin B. Layer B consisting of 30 or more layers alternately laminated in the thickness direction, the average relative reflectance in the wavelength band 400 to 1000 nm is 30% or more and 90% or less, and in the tensile test at 150 ° C., the film longitudinal direction and Metal for electromagnetic wave transmissive member having a tensile stress at 100% elongation in the width direction of 3 MPa or more and 90 MPa or less, and the number of layers having a thickness of 10 nm or more and less than 220 nm is larger than the number of layers having a thickness of 220 nm or more and 320 nm or less. Glossy decorative film. The metal glossy decorative film for an electromagnetic wave transmissive member according to claim 1, wherein the thickness unevenness of the film is 10% or less. The metallic glossy decorative film for electromagnetic wave transmissive members according to claim 1 or 2, wherein the intrinsic viscosity of the thermoplastic resin A and the thermoplastic resin B is 0.50 to 1.0 dl / g, respectively. The metallic glossy decorative film for an electromagnetic wave transmissive member according to any one of claims 1 to 3, wherein the electromagnetic wave attenuation rate at 76 GHz is 2.0 dB or less. 5. The metallic glossy decorative film for electromagnetic wave transmissive members according to claim 1, wherein the colored layer is formed on one side or both sides thereof. 6. The metallic luster for an electromagnetic wave transmissive member according to claim 1, wherein the electromagnetic wave is transmitted from an in-vehicle electromagnetic wave transmitter or received by an in-vehicle electromagnetic wave receiver. Decorative film. An electromagnetic wave transmissive member using the metallic glossy film for an electromagnetic wave transmissive member according to claim 1. The metallic glossy decorative film for electromagnetic wave transmissive members according to any one of claims 1, 2, 3, 4 and 6, having at least a colored layer on one surface side and a protective layer on the other surface side, An electromagnetic wave transmissive member having a three-dimensional shape, not including a layer.

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