JP2009276396A - Light-reflective film and light-eflective plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-reflective film maintaining superior light-reflective properties, preventing contamination by static electricity and preventing disturbances in image display due to electromagnetic wave noise. <P>SOLUTION: The light-reflective film comprises a white thermoplastic resin film and a conductive layer as a surface layer, wherein the reflectance (A) on the surface of the white thermoplastic resin film for light at a wavelength of 550 nm is not less than 90%; the surface resistivity of the conductive layer is not more than 10<SP>13</SP>Ω/unit square; and the reflectance (B) for light at a wavelength of 550 nm, on the surface in the conductive layer side of the light-reflective film, si such that it satisfies expression (1): (reflectance A)-(reflectance B)≤1%. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light reflecting film and a light reflecting plate obtained by laminating the reflecting film on a metal plate or a resin plate. Specifically, the present invention relates to a light reflecting film and a light reflecting plate used in lighting fixtures, lighting signs, liquid crystal display devices and the like.

  In recent years, light reflecting films have been used in reflectors for lighting fixtures, reflectors for lighting signs, reflectors for liquid crystal display devices, projection screens, and members of planar light sources. For example, in light reflectors for liquid crystal displays, in order to improve the performance of the backlight unit by supplying as much light as possible to the liquid crystal due to the demand for larger screens and sophisticated display performance, There is a need for light reflecting films.

  However, since the surface of the light reflecting film is easily charged, there is a problem that dust and the like are easily attached and the reflectance is remarkably lowered. Furthermore, when used in a light reflecting plate for a liquid crystal display device, an electromagnetic wave noise generated from a cold cathode ray tube or an inverter undergoes a process of accumulating and discharging electric charges in the light reflecting film, and thus the image display is disturbed. There was a problem.

Accordingly, it has been proposed to provide a conductive layer on the surface of the light reflecting film to prevent contamination of the surface of the light reflecting film due to static electricity or to prevent image display disturbance due to electromagnetic noise (for example, patents). Literature 1, Patent Literature 2).
JP 2006-163378 A JP 2006-106231 A

  However, when a conductive layer is provided on the surface of the light reflecting film, there is a problem that the reflectance is lowered.

  Therefore, an object of the present invention is to provide a light reflecting film that maintains excellent light reflectivity, prevents contamination due to static electricity, and prevents image display disturbance due to electromagnetic noise.

The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated embodiment.
The first aspect of the present invention is a light reflecting film comprising a white thermoplastic resin film (10) and a conductive layer (20) on the surface layer,
The reflectance A for light with a wavelength of 550 nm on the surface of the white thermoplastic resin film (10) is 90% or more,
The surface resistivity of the conductive layer (20) is 10 ¹³ Ω / □ or less,
The light reflection film satisfying the following formula (1) has a light reflectance B with respect to light having a wavelength of 550 nm on the surface of the light reflection film on the conductive layer (20) side.
(Reflectance A)-(Reflectance B) ≦ 1% (1)
Here, the surface layer on which the conductive layer (20) is provided refers to a surface layer on the side where light is reflected in the light reflecting film.

  In the first aspect of the present invention, the conductive layer (20) includes a binder resin and a conductive agent, and the mass ratio of the binder resin to the conductive agent is in the range of 10/90 to 50/50. It is preferable. By forming the conductive layer (20) containing the binder resin and the conductive agent within the range, the adhesion between the conductive layer (20) and the white thermoplastic resin film (10) can be improved, and the conductive layer ( The surface low efficiency of 20) can be within a desired range.

The volume resistance value of the conductive agent in the conductive layer (20) is preferably in the range of 10 ⁵ Ω · cm to 10 ¹⁰ Ω · cm. By using a conductive agent having such a volume resistance value, the light reflectance B can be made desired.

  2nd this invention is comprised including the light reflection film of 1st this invention, and a metal plate (30), and the side opposite to the side in which the conductive layer (20) of the light reflection film was formed is a metal plate. (30) is a light reflection plate laminated.

  The light reflecting plate of the second aspect of the present invention can be suitably used in a lighting fixture, a lighting signboard, or a liquid crystal display.

  The light reflecting film of the first aspect of the present invention comprises a predetermined white thermoplastic film and a predetermined conductive layer on the surface layer, thereby preventing contamination by static electricity while maintaining excellent light reflectivity. Disturbance of image display due to electromagnetic wave noise can be prevented.

  The present invention will be described in detail below. In the present invention, even when referred to as “film”, “sheet” is included, and even when referred to as “sheet”, “film” is included.

<Light reflection film>
The light reflecting film of the present invention comprises a light reflecting white thermoplastic resin film and a conductive layer provided on the surface. As shown to Fig.1 (a), the conductive layer 20 should just be provided in the light irradiation side in a light reflection film.

(White thermoplastic resin film 10)
As the white thermoplastic resin film 10, the white thermoplastic resin film 10 containing fine bubbles inside the film is used because of high light reflectance and no uneven color tone. As the thermoplastic resin constituting the film, it is preferable to use a polyester resin or a polyolefin resin.

  The white thermoplastic resin film 10 containing fine bubbles inside the film is (1) a method in which a foaming agent is contained and foamed by heat at the time of extrusion or film formation, or foamed by chemical decomposition, (2) at the time of extrusion Or a method of adding a gas such as carbon dioxide or a vaporizable substance after extrusion and foaming, (3) adding a thermoplastic resin film and an incompatible thermoplastic resin, and after melt extrusion, uniaxially or biaxially Examples thereof include a method of stretching, (4) a method of stretching uniaxially or biaxially after adding organic or inorganic fine particles and performing melt extrusion. In the present invention, it is preferable to increase the reflective interface by forming fine bubbles. From this point, it is preferable to use the method (3) or (4).

  Furthermore, a thermoplastic resin to which organic or inorganic fine particles are added is laminated on at least one surface of a film in which fine bubbles are formed inside by a method such as coextrusion, and further stretched, and the surface layer portion is more than the inner layer portion. It is particularly preferable to use a composite film in which fine bubbles are formed.

The size of the bubbles (cross-sectional area size in the film thickness direction) obtained by the above method is preferably 0.5 μm ^{2 to} 50 μm ² , preferably 1 μm ^{2 to} 30 μm ^{2 from} the viewpoint of improving luminance. The cross-sectional shape of the bubble may be either circular or elliptical. Although the number of these bubbles is not particularly limited, a structure in which 10 or more bubbles exist in the thickness direction of the film (at this time, no matter which thickness direction in the plane of the film is observed, 10 bubbles are observed). It is preferable from the viewpoint of improving the reflectance, and it is preferable that 20 or more and 200 or less exist. The number of bubbles can be observed with an image of a scanning electron microscope S-2100A type (manufactured by Hitachi, Ltd.).

  When the light reflecting plate is used, light emitted from the light source enters from the film surface, and it is the most preferable form that all of the incident light is reflected by the internal bubbles. Actually, there is also light that passes through the film, and this part is a loss of reflection, but in order to cover this, aluminum, silver, etc. Alternatively, metal deposition may be performed.

(Conductive layer 20)
A conductive layer 20 is formed on the surface layer of the light reflecting film. A surface layer is the incident light side (light source side) in a light reflection film. By forming the conductive layer, the light reflecting film can be prevented from being contaminated by static electricity and image display disturbance due to electromagnetic wave noise can be prevented.

The surface low efficiency of the conductive layer 20 is 10 ¹³ Ω / □ or less. The conductive layer 20 includes a binder resin and a conductive agent. As the binder resin, a resin that is compatible with the white thermoplastic resin film may be appropriately selected. Examples thereof include polyester resins, acrylic resins, urethane resins, epoxy resins, silicone resins, phenol resins, and modified products thereof. It is done. Among these, at least one selected from polyester resins, acrylic resins, urethane resins, and modified products thereof can be preferably used. These binder components are preferably used in a state of being dissolved or dispersed in water or an arbitrary solvent such as an organic solvent.
When the adhesiveness between the conductive layer 20 and the white thermoplastic resin film 10 is not sufficiently developed, the surface of the white thermoplastic resin film 10 on the conductive layer side is treated with corona treatment, plasma treatment, electron beam irradiation treatment, alkali treatment, acid treatment. After the treatment, the conductive layer 20 may be provided, or a primer layer may be provided on the surface of the white thermoplastic resin film 10 on the conductive layer 20 side.

The conductive agent in the conductive layer 20 has a volume resistance value with a lower limit of preferably 10 ⁵ Ω · cm or more, more preferably 10 ⁶ Ω · cm or more, and an upper limit of preferably 10 ¹⁰ Ω · cm or less, more preferably. Is 10 ⁹ Ω · cm or less. Examples of such a conductive agent include a surfactant, an ionic conductive polymer, and a conductive metal oxide.

  Surfactants include cationic surfactants such as sulfonated compounds, N-acyl amino acids or salts thereof, anionic surfactants such as alkyl ether carboxylates, aliphatic amine salts, and aliphatic quaternary ammonium salts. , Amphoteric surfactants such as carboxybetaine, imidazolinium betaine, and aminocarboxylate. Among them, a sulfonated compound is preferable, specifically, sodium dodecylbenzenesulfonate, sodium stearylbenzenesulfonate, sodium octylbenzenesulfonate, potassium dodecylbenzenesulfonate, lithium dodecylbenzenesulfonate, lithium octylnaphthalenesulfonate, Sodium oxylnaphthalene sulfonate, sodium dodecyl naphthalene sulfonate, potassium dodecyl naphthalene sulfonate, sodium butyl sulfonate, sodium pentyl sulfonate, sodium hexyl sulfonate, sodium heptyl sulfonate, sodium octyl sulfonate, sodium nonyl sulfonate, decyl sulfone Acid sodium, sodium undecyl sulfonate, sodium dodecyl sulfonate, tri Examples include sodium silsulfonate, sodium tetradecylsulfonate, sodium pentadecylsulfonate, sodium hexadecylsulfonate, sodium heptadecylsulfonate, sodium octadecylsulfonate, potassium decylsulfonate, potassium dodecylsulfonate, and potassium octadecylsulfonate. It is done.

  Examples of the ionic conductive polymer include polystyrene sulfonates such as polystyrene sulfonate and its alkali metal salts, ammonium salts, and phosphate low molecular weight compounds represented by alkyl phosphate ester salts and alkyl ether phosphate ester salts. Examples thereof include a phosphoric acid polymer compound copolymerized as a monomer and a polyacrylic acid ester having an ionic functional group.

An example of the conductive metal oxide is tin oxide. The tin oxide here is different from so-called ATO or ITO doped with antimony, indium, or the like, and has a volume resistance value in the range of 10 ⁵ Ω · cm to 10 ¹⁰ Ω · cm, Tin oxide not doped with other metals.

  Among the conductive agents described above, it is most preferable to use tin oxide. Tin oxide is a conductive agent that hardly inhibits the reflectance of the white thermoplastic resin film when used in the conductive layer 20 on the surface of the white thermoplastic resin film.

  The mass ratio (binder resin / conductive agent) between the binder resin and the conductive agent in the conductive layer 20 is preferably 10/90 or more and 50/50 or less, more preferably 10/90 or more and 40/60 or less, More preferably, it is 15/85 or more and 35/65 or less. When the ratio of the binder resin is too small, not only is the adhesiveness to the white thermoplastic resin film 10 inferior, but a problem that the conductive agent tends to be lost tends to occur. On the other hand, when the ratio of the binder resin is too large, the amount of the conductive agent is small, so that the conductivity of the conductive layer is difficult to be exhibited, static electricity is easily charged, and electromagnetic noise is likely to be generated.

  When the adhesion between the white thermoplastic resin film 10 and the conductive layer 20 is inferior, an adhesive layer and a primer layer may be provided between the white thermoplastic resin film 10 and the conductive layer 20.

  The lower limit of the thickness of the conductive layer 20 is preferably 0.05 μm or more, more preferably 0.1 μm or more from the viewpoint of conductivity, and the upper limit is preferably 10 μm or less, more preferably 5 μm from the viewpoint of reflectivity. It is as follows.

(Reflectance A, Reflectance B)
In the light reflecting film of the present invention, the reflectance of the surface of the white thermoplastic resin film 10 with respect to light having a wavelength of 550 nm is defined as reflectance A, and light having a wavelength of 550 nm on the surface of the conductive layer 20 of the light reflecting film of the present invention When the reflectance with respect to is defined as reflectance B, the relationship of the following formula (1) is established between reflectance A and reflectance B.
(Reflectance A)-(Reflectance B) ≦ 1% (1)

This relationship is more preferably the following formula (2), and further preferably the following formula (3).
(Reflectance A)-(Reflectance B) ≦ 0.8% (2)
(Reflectance A)-(Reflectance B) ≦ 0.5% (3)
If the relationship of Formula (1) is satisfied, even if the conductive layer 20 is provided, the reflection characteristics of the white thermoplastic resin film 10 are not hindered, so that sufficient brightness can be given to the screen of a liquid crystal display or the like.

The reflectance A of the white thermoplastic resin film 10 with respect to light having a wavelength of 550 nm is 90% or more, preferably 95% or more, more preferably 97% or more. The reflectance B of the light reflecting film having the conductive layer 20 with respect to light having a wavelength of 550 nm is preferably 90% or more, more preferably 95% or more, and still more preferably 97% or more. When the reflectance B is 90% or more, good reflection characteristics are exhibited, and sufficient brightness can be given to a screen such as a liquid crystal display.
In the light reflection film of the present invention, for example, the film having the reflectance A and the reflectance B satisfying the relationship of the above formula (1) by including the predetermined white thermoplastic film and the predetermined conductive layer. It can be.

<Light reflector>
The light reflecting plate of the present invention comprises the above light reflecting film and the metal plate 30, and the light reflecting film is such that the conductive layer 20 side of the light reflecting film is the surface (incident light side (light source side)). And the metal plate 30 are laminated. This light reflecting plate is useful as a light reflecting plate used for liquid crystal display devices, lighting fixtures, lighting signs, and the like. Further, a light reflection plate may be formed by using a resin plate instead of the metal plate 30.

Examples of the metal plate 30 include a stainless steel plate having a thickness of 0.05 mm to 0.5 mm, an aluminum alloy plate having a thickness of 0.1 mm to 0.6 mm, or a brass plate having a thickness of 0.2 mm to 0.4 mm. The lighting fixture lighting signboard, the type of liquid crystal display device, and the like are appropriately selected and used. However, it is not limited to these.
Examples of the resin plate include polyolefin (PO) resins such as homopolymers or copolymers containing ethylene or polyolefin elastomers, polystyrene resins such as polystyrene (PS), ABS, SBS, SIS, or SEBS, SEPS, Hydrogenated styrene elastomer such as SEEPS, polyvinyl chloride (PVC) resin, polyvinylidene chloride (PVDC) resin, polymethyl methacrylate (PMMA), acrylic resin such as copolymerized acrylic, polyethylene terephthalate (PET), etc. Polyamide (PA) resin such as polyester resin, nylon 6, nylon 12, copolymer nylon, polyvinyl alcohol resin such as polyvinyl alcohol (PVA) resin, ethylene-vinyl alcohol copolymer (EVOH), polyimide PI) resin, polyetherimide (PEI) resin, polysulfone (PS) resin, polyethersulfone (PES) resin, polyamideimide (PAI) resin, polyetheretherketone (PEEK) resin, polycarbonate (PC) resin, polyvinyl Butyral (PVB) resin, polyarylate (PAR) resin, vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene copolymer (THV), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), fluoride Use fluorometer resins or elastomers such as vinylidene (PVDF) and vinyl fluoride (PVF), (meth) acrylate resins, phenol resins, epoxy resins, unsaturated polyester resins, urethane resins, melamine resins, urea resins, etc. Can do.

  As a method of coating the light reflecting film on the metal plate 30 or the resin plate, a method using an adhesive, a method of heat-sealing without using an adhesive, a method of bonding via an adhesive sheet, and extrusion coating are used. There are methods and the like, which are not particularly limited. For example, an adhesive such as polyester, polyurethane, or epoxy can be applied to the surface of the metal plate or resin plate on the side where the light reflecting film is bonded, and the light reflecting film can be bonded. In this method, commonly used coating equipment such as a reverse roll coater and a kiss roll coater is used, and the adhesive film thickness after drying on the surface of a metal plate or the like to which the reflective film is bonded is about 2 μm to 4 μm. Apply an adhesive so that Next, the coated surface is dried and heated with an infrared heater and a hot-air heating furnace, and while maintaining the surface of the plate at a predetermined temperature, the light reflection film is directly covered and cooled using a roll laminator, thereby producing light. A reflector can be obtained. In this case, if the surface of the metal plate or the like is held at 210 ° C. or lower, the light reflectivity of the light reflecting plate can be maintained high. In addition, it is preferable that the surface temperature of a metal plate etc. is 160 degreeC or more.

  Hereinafter, although an example is shown and the present invention is explained, the present invention is not limited to this.

<Evaluation method>
(1) Reflectance (%)
An integrating sphere was attached to a spectrophotometer (“U-4000”, manufactured by Hitachi, Ltd.), and the reflectance with respect to light having a wavelength of 550 nm was measured.
Before the measurement, the photometer was set so that the reflectance of the alumina white plate was 100%.

(2) Surface resistivity measurement The surface resistivity of the conductive layer was measured as follows according to JIS K6911.
1. Measuring device Hirestar UP MCP-HT450 (Mitsubishi Chemical Corporation)
2. 2. Measurement method Constant voltage application method Applied voltage 1000V

(3) Adhesion evaluation The adhesion of the conductive layer was measured according to the cross-cut tape method of JIS K5400. The clearance interval was 1 mm, the number of cells was 100, and 18 mm of cellophane adhesive tape “Nichiban 405” was used. 90/100 or more was considered acceptable.

<Example 1>
Acrylic emulsion (AE986B, solid concentration: 35%, manufactured by JSR) and tin oxide (S-1, volume resistivity: 10 ⁶ Ω · cm, primary particle size: 0.03 μm, manufactured by JEMCO) and ion exchange Water was mixed so that acrylic resin / tin oxide = 20/80 and the solid content concentration was 10% by mass ratio to produce a conductive paint. Add 50cc of zirconia beads (0.4mm in diameter) to 50cc of the produced conductive paint, use PAINT SHAKER (manufactured by Toyo Seiki Seisakusyo), and after stirring for 2 hours, filter the zirconia beads through a mesh, Paint 1 was prepared. The obtained conductive paint 1 had good dispersibility of tin oxide.

  The conductive paint 1 is a white polyester film (Lumirror E60L, manufactured by Toray Industries, Inc., thickness 188 μm, film surface reflectance A for light with a wavelength of 550 nm: 95.2%), and the conductive layer thickness after drying is 2.0 μm. It was applied using a bar coater, dried at 100 ° C. for 1 minute to form a conductive layer, and the light reflecting film of the present invention was obtained. The reflectance B, surface resistivity, and adhesion of the film surface with respect to light having a wavelength of 550 nm in Example 1 were evaluated. The results are shown in Table 1.

<Examples 2 to 4>
In the same manner as in Example 1, conductive paints 2 to 4 in which the mass ratio of acrylic resin / tin oxide was changed as shown in Table 1 were prepared. As in Example 1, the conductive paints 2 to 4 were applied to a white polyester film using a bar coater so that the thickness of the conductive layer after drying was 2.0 μm, and dried at 100 ° C. for 1 minute. The light reflection film provided was obtained. The reflectance B of the film surface with respect to the light of wavelength 550nm of Examples 2-4, surface resistivity, and adhesiveness were evaluated. The results are shown in Table 1.

<Reference Example 1, Comparative Example 1>
In the same manner as in Example 1, conductive paints 5 and 6 in which the weight ratio of acrylic resin / tin oxide was changed as shown in Table 1 were prepared. As in Example 1, the conductive paints 5 and 6 were applied to a white polyester film using a bar coater so that the thickness of the conductive layer after drying was 2.0 μm, and dried at 100 ° C. for 1 minute. The light reflection film provided was obtained. The reflectance B of the film surface with respect to the light of wavelength 550nm of the reference example 1 and the comparative example 1, surface resistivity, and adhesiveness were evaluated. The results are shown in Table 1.

<Comparative Example 2>
Acrylic emulsion (AE986B, solid content concentration: 35%, manufactured by JSR) and ATO (tin-antimony oxide T-1, volume resistivity: 1-5 Ω · cm, primary particle size: 0.02 μm, JEMCO) Manufactured) and ion-exchanged water were mixed so that the mass ratio was acrylic resin / ATO = 60/40, and the solid content concentration was 10%, to prepare a conductive paint. Add 50cc of zirconia beads (0.4mm in diameter) to 50cc of the produced conductive paint, use PAINT SHAKER (manufactured by Toyo Seiki Seisakusyo), and after stirring for 2 hours, filter the zirconia beads through a mesh, Paint 7 was produced. The obtained conductive paint 7 had good dispersibility of ATO.

  The conductive paint 7 is a white polyester film (Lumirror E60L, manufactured by Toray Industries, Inc., thickness: 188 μm, film surface reflectance A for light with a wavelength of 550 nm: 95.2%), and the conductive layer thickness after drying is 2.0 μm. This was applied using a bar coater and dried at 100 ° C. for 1 minute to obtain a light reflecting film provided with a conductive layer. Table 1 shows the reflectance B, surface resistivity, and adhesion evaluation of the film surface with respect to light having a wavelength of 550 nm in Comparative Example 2.

  From Table 1, as for the light reflection film of Examples 1-4, all are (reflectance A (95.2%) of a white polyester film)-(reflectance B of the light reflection film which has a conductive layer) 1% or less. The light reflecting film was excellent in conductivity and adhesion between the conductive layer and the white polyester film, without hindering the reflectance of the white polyester film.

  On the other hand, it was found that Reference Example 1 was inferior in adhesion between the conductive layer and the white polyester film because the content of the acrylic resin as the binder resin was small. Moreover, since the comparative example 1 had few amounts of electrically conductive agents, it turned out that sufficient electroconductivity is not expressed.

  Furthermore, although the comparative example 2 which used ATO as a electrically conductive agent is excellent in electroconductivity and the adhesiveness of a conductive layer and a white polyester film, (reflectance A (95.2%) of a white polyester film)-( It was found that the reflectance B) of the light reflecting film having a conductive layer exceeded 1%, which hindered the reflectance of the white polyester film.

<Example 5>
In the following procedure, the light reflecting film obtained in Example 1 was coated on a galvanized steel plate (thickness 0.45 mm) to obtain a reflecting plate. A commercially available polyester-based adhesive was applied to the surface of the steel sheet on which the reflective film was bonded so that the adhesive film thickness after drying was about 2 to 4 μm. Next, the coated surface is dried and heated by an infrared heater and a hot-air heating furnace, and while maintaining the surface temperature of the steel plate at 180 ° C., immediately using a roll laminator, the reflective film is coated and cooled, thereby providing a light reflecting plate. Obtained. The obtained reflector had a reflectivity of 95.2% with respect to light having a wavelength of 550 nm.

  Thus, it was found that the light reflecting film of the present invention is a reflecting film that maintains excellent light reflectivity, prevents contamination due to static electricity, and prevents image display disturbance due to electromagnetic noise. . In particular, it is used for a lighting device, a lighting signboard, a liquid crystal display device, etc., which is formed by coating a reflective film used for a reflective sheet such as a lighting fixture lighting signboard, a liquid crystal display device, etc. and the reflective film on a metal plate or a resin plate. It was found that it can be suitably used for a light reflector.

  While the present invention has been described in connection with embodiments that are presently the most practical and preferred, the present invention is not limited to the embodiments disclosed herein. However, the invention can be changed as appropriate without departing from the scope or spirit of the invention that can be read from the claims and the entire specification, and the light reflecting film and the light reflecting plate accompanying such changes are also within the technical scope of the present invention. It must be understood as included.

(A) is a conceptual diagram which shows the layer structure of a light reflection film. (B) is a conceptual diagram which shows the layer structure of a light reflection board.

Explanation of symbols

10 white thermoplastic resin film 20 conductive layer 30 metal plate

Claims (5)

A white thermoplastic resin film, and a light reflecting film comprising a conductive layer on a surface layer,
The reflectance A for light having a wavelength of 550 nm on the surface of the white thermoplastic resin film is 90% or more,
The surface resistivity of the conductive layer is 10 ¹³ Ω / □ or less,
The light reflection film with which the light reflectivity B with respect to the light of wavelength 550nm of the conductive layer side surface of this light reflection film satisfy | fills the following formula | equation (1).
(Reflectance A)-(Reflectance B) ≦ 1% (1) The conductive layer comprises a binder resin and a conductive agent;
The light reflecting film according to claim 1, wherein a mass ratio of the binder resin to the conductive agent is in a range of 10/90 to 50/50. The light reflecting film according to claim 2, wherein a volume resistance value of the conductive agent is in a range of 10 ⁵ Ω · cm to 10 ¹⁰ Ω · cm. The light reflecting film according to any one of claims 1 to 3, and a metal plate.
A light reflecting plate, wherein a side opposite to the side on which the conductive layer is formed in the light reflecting film is laminated on a metal plate. The light reflecting plate according to claim 4, which is used for a lighting fixture, a lighting signboard, or a liquid crystal display.

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