WO2023189784A1 - 赤外線透過性の光輝塗膜及び赤外線透過カバー - Google Patents
赤外線透過性の光輝塗膜及び赤外線透過カバー Download PDFInfo
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- WO2023189784A1 WO2023189784A1 PCT/JP2023/010773 JP2023010773W WO2023189784A1 WO 2023189784 A1 WO2023189784 A1 WO 2023189784A1 JP 2023010773 W JP2023010773 W JP 2023010773W WO 2023189784 A1 WO2023189784 A1 WO 2023189784A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/40—Compounds of aluminium
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/62—Metallic pigments or fillers
- C09C1/64—Aluminium
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/10—Treatment with macromolecular organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/032—Powdery paints characterised by a special effect of the produced film, e.g. wrinkle, pearlescence, matt finish
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/29—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for multicolour effects
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/69—Particle size larger than 1000 nm
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
Definitions
- the present disclosure relates to an infrared-transparent bright coating film and an infrared-transparent cover.
- Patent Document 1 discloses an infrared transmitting product.
- the infrared transmitting product includes a main body that covers from the front an infrared sensor that is placed behind a front grill of a vehicle, for example.
- the main body includes a transparent base material and a coating layer formed on the rear surface of the transparent base material. Both the transparent base material and the coating layer have infrared transmittance.
- the transparent base material is formed of a resin material such as polycarbonate.
- the coating layer includes a transparent resin such as an epoxy resin and aggregates dispersed within the transparent resin.
- the aggregate is an agglomeration of fine particles of a plurality of pigments.
- the pigment used is titanium oxide, which produces a white color by diffusely reflecting light on the particle surface.
- Such infrared transmitting products have infrared transmittance and visible light reflectivity.
- some vehicle exterior members are provided with a metallic coating film having a transparent base resin and a filler added to the base resin. In these exterior parts, visible light is reflected by the aluminum flakes that make up the filler, creating a shimmering metallic appearance.
- An infrared-transparent glossy coating film for solving the above problems is an infrared-transparent glossy coating film that includes an infrared-transparent base resin and a filler added to the base resin, the filler comprising: It has an aluminum flake and an infrared transparent resin film covering both sides of the flake in the thickness direction, and the thickness of the resin film is larger than the thickness of the flake,
- the particle size of the filler is 10 ⁇ m or more and 120 ⁇ m or less
- the weight concentration of the filler is 0.1% or more and 1.0% or less
- the area occupation rate of the filler is 0.5% or more, It is 1.5% or less.
- the smaller the filler content the higher the infrared transmittance.
- a metallic tone cannot be expressed.
- the thickness of the resin film is made larger than the thickness of the flakes, it is possible to suppress the distance between the flakes from becoming too small in the base resin.
- the first wavelength band is 880 nm or more and 930 nm or less, and the first wavelength band is 1540 nm or more and 1560 nm or less.
- the light transmittance of the bright coating film in both of the two wavelength bands is 70% or more and 92% or less. Further, the grain feel of the bright coating film, that is, the G value is 5 or more and 30 or less. Note that the higher the graininess, that is, the G value, the higher the glare.
- the filler preferably has a thickness of 1 ⁇ m or more and 3 ⁇ m or less, and the flakes preferably have a thickness of 20 nm or more and 100 nm or less.
- the infrared-transparent bright coating film preferably has a thickness of 5 ⁇ m or more and 50 ⁇ m or less.
- the thickness of the glitter coating film is less than 5 ⁇ m, the graininess tends to be less than 5, making it difficult to enhance the glare.
- the thickness of the bright coating film is greater than 50 ⁇ m, the light transmittance tends to be less than 70%.
- the bright coating film has a thickness of 5 ⁇ m or more and 50 ⁇ m or less, the occurrence of the above-mentioned disadvantages can be suppressed. Therefore, it is possible to more reliably achieve the effect of expressing a metallic tone while increasing the light transmittance in the two wavelength bands of the infrared radar device.
- An infrared transmitting cover for solving the above problems includes an infrared transmitting transparent base material, an infrared transmitting bright coating film provided on the transparent base material, and an infrared transmitting gloss coating film provided on the transparent base material, and the transparent base material in the bright coating film. is provided on the opposite surface and includes a visible light cut layer that blocks transmission of visible light.
- FIG. 1 is a cross-sectional view of a cover of one embodiment.
- FIG. 2 is a sectional view of a filler that constitutes the bright coating film of FIG. 1.
- FIG. 3 is an enlarged sectional view of the bright coating film of FIG. 1.
- an infrared radar device 90 is provided in the vehicle.
- the infrared radar device 90 transmits infrared IR with a wavelength included in a first wavelength band of 880 nm or more and 930 nm or less or a second wavelength band of 1540 nm or more and 1560 nm or less.
- the front and rear in the transmission direction of the infrared IR from the infrared radar device 90 will be simply referred to as the front and the rear, respectively.
- the vehicle is provided with an infrared transmission cover (hereinafter referred to as cover 10) that covers the infrared radar device 90 from the front.
- the cover 10 includes an infrared transparent transparent base material 11, an infrared transparent bright coating film 12 provided on the transparent base material 11, and a bright coating film 12 provided on the opposite side of the transparent base material 11. and a visible light cut layer 13 that blocks transmission of visible light.
- the transparent base material 11 is made of a resin material such as polycarbonate, polymethyl methacrylate, cycloolefin polymer, or resin glass.
- the transparent base material 11 of this embodiment is formed of polycarbonate.
- the bright coating film 12 includes an infrared-transparent base resin 21 and a filler 22 added to the base resin 21.
- the bright coating film 12 is formed by applying a paint containing a base resin 21 and a filler 22 to the rear surface of the transparent substrate 11.
- a curing agent may be used in the paint as necessary.
- the base resin 21 is made of epoxy resin, silicone resin, urethane, urea resin, phenol resin, polyethylene, polypropylene, polyethylene terephthalate, vinyl chloride, polystyrene, acrylonitrile butadiene styrene copolymer, acrylic resin, polyamide, polyimide, polycarbonate, and melamine resin.
- the main component is at least one selected from the group consisting of: Note that the term "main component” refers to a component that affects the properties of the material, and the content of the component is usually 50% by mass or more of the entire material.
- the curing agent is used as appropriate depending on the material of the base resin 21.
- the base resin 21 is made of an epoxy resin as a main component
- examples of the curing agent include acid anhydride curing agents and phenol curing agents.
- the curing agent can be omitted.
- curing agent other curing agents can be used in addition to the acid anhydride curing agent and phenol curing agent, depending on the purpose and use.
- curing agents include amine-based curing agents, partial esterification of the above acid anhydride-based curing agents with alcohol, or carboxylic acids such as hexahydrophthalic acid, tetrahydrophthalic acid, and methylhexahydrophthalic acid.
- carboxylic acids such as hexahydrophthalic acid, tetrahydrophthalic acid, and methylhexahydrophthalic acid.
- acid curing agents include acid curing agents. These may be used alone or in combination of two or more, and further may be used in combination with the acid anhydride curing agent and phenol curing agent.
- the filler 22 includes aluminum flakes 23 and an infrared-transparent resin film 24 that covers both sides of the flakes 23 in the thickness direction.
- the resin film 24 is made of, for example, acrylic, urethane, ester, or siloxane resin. Note that the filler 22 may be colored by adding a pigment to the resin film 24.
- the filler 22 has a flat shape.
- the thickness t2 of the resin film 24 is made larger than the thickness t1 of the flakes 23 (t2>t1).
- the particle diameter D of the filler 22 is 10 ⁇ m or more and 120 ⁇ m or less.
- the particle diameter D of the filler 22 is the maximum length of the filler 22 in the surface direction.
- the thickness t3 of the filler 22 is preferably 1 ⁇ m or more and 3 ⁇ m or less.
- the thickness t1 of the flakes 23 is 60 nm.
- the thickness t2 of the resin film 24 is 970 nm. Note that the relationship expressed by the following equation 1 holds between the thickness t3 of the filler 22, the thickness t1 of the flakes 23, and the thickness t2 of the resin film 24.
- the filler 22 is formed, for example, as follows. That is, first, a first resin film is formed on the substrate. Next, an aluminum film is formed on the first resin film by a vapor deposition method. Next, a second resin film is formed on the aluminum film. In this way, a sheet with a three-layer structure is formed. The filler 22 is then formed by crushing the sheet. In this case, the resin film 24 is provided only on both sides of the flake 23.
- the weight concentration of the filler 22 in the bright coating film 12 is 0.1% or more and 1.0% or less.
- the area occupation rate of the filler 22 in the bright coating film 12 is 0.5% or more and 1.5% or less.
- the bright coating film 12 has a thickness t4 of 5 ⁇ m or more and 50 ⁇ m or less. It is more preferable that the bright coating film 12 has a thickness t4 of 20 ⁇ m or more and 40 ⁇ m or less. The thickness t4 of the bright coating film 12 of this embodiment is 30 ⁇ m.
- the visible light cut layer 13 is, for example, a well-known black press coating. Note that a visible light-cutting pigment may be added to the black press coating film. Next, the operation of this embodiment will be explained.
- infrared IR transmitted from the infrared radar device 90 passes through the gaps between the fillers 22. Further, visible light VL entering the bright coating film 12 through the transparent base material 11 is reflected at the front surface of the flakes 23 of the filler 22.
- the cover 10 exhibits a black color developed by the visible light cut layer 13. Further, in the cover 10, the visible light VL is reflected by the flakes 23, so that a sparkling metallic tone is expressed.
- the filler 22 includes aluminum flakes 23 and an infrared-transparent resin film 24 that covers both sides of the flakes 23 in the thickness direction.
- the thickness t2 of the resin film 24 is made larger than the thickness t1 of the flakes 23.
- the particle diameter D of the filler 22 is 10 ⁇ m or more and 120 ⁇ m or less.
- the weight concentration of the filler 22 is 0.1% or more and 1.0% or less.
- the area occupation rate of the filler 22 is 0.5% or more and 1.5% or less.
- the thickness t2 of the resin film 24 is made larger than the thickness t1 of the flakes 23, it is possible to suppress the distance between the flakes 23 from becoming too small within the base resin 21.
- the light transmittance of No. 12 is 70% or more and 92% or less.
- the grain feel of the bright coating film 12, that is, the G value is 5 or more and 30 or less. Note that the higher the graininess, that is, the G value, the higher the glare. Therefore, it is possible to express a metallic tone while having high infrared transmittance in the two wavelength bands of the infrared radar device 90.
- the thickness t3 of the filler 22 is 1 ⁇ m or more and 3 ⁇ m or less.
- the thickness t1 of the flakes 23 is 20 ⁇ m or more and 100 ⁇ m or less. According to such a configuration, it is possible to sufficiently suppress the distance between the flakes 23 from becoming too small in the base resin 21, so that the light transmittance of the infrared radar device 90 in the two wavelength bands can be increased. Furthermore, it is possible to ensure a sufficient thickness t1 of the flakes 23 to enhance the glare.
- the bright coating film 12 has a thickness t4 of 5 ⁇ m or more and 50 ⁇ m or less.
- the thickness t4 of the bright coating film 12 is less than 5 ⁇ m, the graininess, that is, the G value tends to be less than 5, making it difficult to enhance the glare.
- the thickness t4 of the bright coating film 12 is greater than 50 ⁇ m, the light transmittance is likely to be less than 70%.
- the bright coating film 12 has a thickness t4 of 5 ⁇ m or more and 50 ⁇ m or less, the occurrence of the above-mentioned disadvantages can be suppressed. Therefore, while having high infrared transmittance in the two wavelength bands of the infrared radar device 90, it is possible to more reliably achieve the effect of expressing a metallic tone.
- the cover 10 includes an infrared-transparent transparent base material 11, a bright coating film 12 provided on the transparent base material 11, and a surface of the bright coating film 12 provided on the opposite side of the transparent base material 11. , and a visible light cut layer 13 that blocks transmission of visible light.
- the resin film 24 may cover the periphery of the flake 23 in addition to both surfaces of the flake 23. That is, the filler 22 may be such that the entire flake 23 is covered with the resin film 24.
- the thickness t4 of the bright coating film 12 can be less than 5 ⁇ m or more than 50 ⁇ m.
- the thickness t3 of the filler 22 can be less than 1 ⁇ m or more than 3 ⁇ m.
- the thickness t1 of the flakes 23 can be less than 20 nm, or can be greater than 100 nm.
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Abstract
Description
また従来、車両の外装部材などにおいては、透明なベース樹脂と、ベース樹脂に添加されたフィラーとを有するメタリック塗膜が設けられているものがある。こうした外装部品では、フィラーを構成するアルミニウム製のフレークによって可視光が反射されることで、きらきらと輝く金属調を表現できる。
この点、上記構成によれば、樹脂膜の厚さが、フレークの厚さよりも大きくされているため、ベース樹脂内においてフレーク同士の間隔が小さくなりすぎることを抑制できる。そして、上記構成によるように、フィラーの粒子径、フィラーの重量濃度、及びフィラーの面積占有率が設定されることで、880nm以上、930nm以下の第1波長帯及び1540nm以上、1560nm以下である第2波長帯の双方における光輝塗膜の光線透過率が、70%以上、92%以下となる。また、光輝塗膜の粒子感、すなわちG値が、5以上、30以下となる。なお、粒子感、すなわちG値が高くなるほど、ぎらぎら感が高くなる。
上記赤外線透過性の光輝塗膜において、前記フィラーの厚さは、1μm以上、3μm以下であり、前記フレークの厚さは、20nm以上、100nm以下であることが好ましい。
光輝塗膜の厚さが5μm未満の場合には、粒子感が5未満になりやすいので、ぎらぎら感を高めることが難しくなる。一方、光輝塗膜の厚さが50μmよりも大きい場合には、光線透過率が70%未満になりやすい。
図1に示すように、車両には、赤外線レーダ装置90が設けられている。赤外線レーダ装置90は、880nm以上、930nm以下の第1波長帯または1540nm以上、1560nm以下である第2波長帯に含まれる波長の赤外線IRを送信する。
図1に示すように、車両には、赤外線レーダ装置90を前方から覆う赤外線透過カバー(以下、カバー10)が設けられている。
光輝塗膜12は、ベース樹脂21及びフィラー22を含む塗料を透明基材11の後面に塗布することによって形成されている。塗料には、必要に応じて硬化剤が用いられてもよい。
ベース樹脂21は、エポキシ樹脂、シリコーン樹脂、ウレタン、ユリア樹脂、フェノール樹脂、ポリエチレン、ポリプロピレン、ポリエチレンテレフタレート、塩化ビニル、ポリスチレン、アクリロニトリルブタジエンスチレン共重合体、アクリル樹脂、ポリアミド、ポリイミド、ポリカーボネート及びメラミン樹脂からなる群から選ばれた少なくとも一種を主成分とする。なお、「主成分」とは、その材料の特性に影響を与える成分を意味し、その成分の含有量は、通常、材料全体の50質量%以上である。
<フィラー22>
図2に示すように、フィラー22は、アルミニウム製のフレーク23と、フレーク23の厚さ方向の両面を被覆する赤外線透過性の樹脂膜24とを有している。樹脂膜24は、例えばアクリル系、ウレタン系、エステル系、シロキサン系などの樹脂製である。なお、樹脂膜24に顔料を添加することで、フィラー22を着色するようにしてもよい。
フィラー22の粒子径Dは、10μm以上、120μm以下である。フィラー22の粒子径Dは、フィラー22の面方向における最大長さである。
フレーク23の厚さt1は、20nm以上、100nm以下である。
本実施形態では、フィラー22の厚さt3が、2μm(=2000nm)である。フレーク23の厚さt1が、60nmである。樹脂膜24の厚さt2が、970nmである。なお、フィラー22の厚さt3と、フレーク23の厚さt1と、樹脂膜24の厚さt2との間に、以下の式1の関係が成立する。
フィラー22は、例えば以下のようにして形成されている。すなわち、まず基板上に第1樹脂膜を形成する。次に、第1樹脂膜上に、アルミニウム膜を蒸着法により形成する。次に、アルミニウム膜上に第2樹脂膜を形成する。このようにして、3層構造のシートを形成する。そして、シートを粉砕することにより、フィラー22が形成される。この場合、樹脂膜24は、フレーク23の両面のみに設けられている。
光輝塗膜12におけるフィラー22の面積占有率は、0.5%以上、1.5%以下である。
次に、本実施形態の作用について説明する。
(1)フィラー22は、アルミニウム製のフレーク23と、フレーク23の厚さ方向の両面を被覆する赤外線透過性の樹脂膜24とを有している。樹脂膜24の厚さt2は、フレーク23の厚さt1よりも大きくされている。フィラー22の粒子径Dは、10μm以上、120μm以下である。フィラー22の重量濃度は、0.1%以上、1.0%以下である。フィラー22の面積占有率は、0.5%以上、1.5%以下である。
こうした構成によれば、ベース樹脂21内においてフレーク23同士の間隔が小さくなりすぎることを十分に抑制できるので、赤外線レーダ装置90の2つの波長帯における光線透過率を高めることができる。また、ぎらぎら感を高めるためのフレーク23の厚さt1を十分に確保することができる。
光輝塗膜12の厚さt4が5μm未満の場合には、粒子感、すなわちG値が5未満になりやすいので、ぎらぎら感を高めることが難しくなる。一方、光輝塗膜12の厚さt4が50μmよりも大きい場合には、光線透過率が70%未満になりやすい。
<変形例>
本実施形態は、以下のように変更して実施することができる。本実施形態及び以下の変更例は、技術的に矛盾しない範囲で互いに組み合わせて実施することができる。
・フィラー22の厚さt3を、1μm未満とすることもできるし、3μmより大きくすることもできる。
Claims (4)
- 赤外線透過性のベース樹脂と、前記ベース樹脂に添加されたフィラーとを含む赤外線透過性の光輝塗膜であって、
前記フィラーは、アルミニウム製のフレークと、前記フレークの厚さ方向の両面を被覆する赤外線透過性の樹脂膜と、を有しており、
前記樹脂膜の厚さは、前記フレークの厚さよりも大きくされており、
前記フィラーの粒子径は、10μm以上、120μm以下であり、
前記フィラーの重量濃度は、0.1%以上、1.0%以下であり、
前記フィラーの面積占有率は、0.5%以上、1.5%以下である、
赤外線透過性の光輝塗膜。 - 前記フィラーの厚さは、1μm以上、3μm以下であり、
前記フレークの厚さは、20nm以上、100nm以下である、
請求項1に記載の赤外線透過性の光輝塗膜。 - 5μm以上、50μm以下の厚さを有している、
請求項1または請求項2に記載の赤外線透過性の光輝塗膜。 - 赤外線透過性の透明基材と、
前記透明基材上に設けられた請求項1から請求項3のいずれか一項に記載の赤外線透過性の光輝塗膜と、
前記光輝塗膜において前記透明基材とは反対側の面に設けられ、可視光の透過を阻止する可視光カット層と、を備えている、
赤外線透過カバー。
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| CN121100154A (zh) * | 2023-05-16 | 2025-12-09 | 威普乐酷高新科技股份有限公司 | 金属质感装饰层叠体、金属质感物品及金属质感装饰层叠体的制造方法 |
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| JP6933587B2 (ja) * | 2018-01-18 | 2021-09-08 | 豊田合成株式会社 | ミリ波透過性光沢塗膜及び樹脂製品 |
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2023
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| JPH0756011A (ja) * | 1993-08-17 | 1995-03-03 | Nissha Printing Co Ltd | 前面パネルおよび前面パネル用転写材 |
| JP2003096334A (ja) * | 2001-09-26 | 2003-04-03 | Toyo Aluminium Kk | 着色アルミニウム顔料、その製造方法および塗料組成物 |
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| JP2019168264A (ja) * | 2018-03-22 | 2019-10-03 | 豊田合成株式会社 | 近赤外線センサカバー |
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| CN118804959A (zh) | 2024-10-18 |
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