Resin composition for low-reflection light-shielding layer, low-reflection light-shielding layer and low-reflection light-shielding layer laminate using the same

Abstract

This invention provides a low-reflection light-shielding layer with low surface reflectivity and L* value. A resin composition for a low-reflection light-shielding layer comprises at least a binder resin, a coloring material, resin particles, and a dispersion medium. The binder resin, in terms of solid content, comprises 1-30% by mass relative to the total amount; the coloring material, in terms of solid content, comprises 0.1-35% by mass relative to the total amount; and the resin particles, in terms of solid content, comprises 50-95% by mass relative to the total amount. Here, the resin particles preferably have an average particle size D of 3-20 μm. 50 Furthermore, the resin particles are preferably those containing colored resin particles.

Description

Technical Field

[0001] The present invention relates to a resin composition for a low-reflection light-shielding layer having a novel composition, a low-reflection light-shielding layer using the same, a low-reflection light-shielding layer laminate, and the like. Background Art

[0002] In various optical devices such as single-lens reflex cameras, compact cameras, video cameras, and smartphones, light-shielding components with high light-shielding properties and low gloss are used from the perspective of removing unnecessary incident light and reflected light, and suppressing the occurrence of halo, lens flare, and ghosting. For example, lens units and camera modules that are interposed between lenses, such as light shielding plates and light shielding rings, are installed in various optical devices. In addition, in shutters and aperture components of various optical devices such as single-lens reflex cameras, compact cameras, and video cameras, components with light-shielding properties are used from the perspective of preventing the occurrence of halo and ghosting caused by external light.

[0003] On the other hand, due to the remarkable progress of sensing technology in recent years, the introduction of advanced sensing technology is being studied in various mobile bodies (hereinafter referred to as "mobile carriers") such as automobiles, trains, trains, trams, ships, cargo ships, aircraft, spacecraft, rockets, transportation equipment, and vehicles. For example, in order to detect obstacles (such as other vehicles, pedestrians, guardrails, houses, etc.) in front of the vehicle, the development of automobiles is progressing in which optical sensors such as lens units (camera modules) equipped with imaging elements and infrared sensors are installed in the vehicle cabin.

[0004] Conventionally, as light shielding members of various optical devices, those obtained by coating a metal thin film with a black paint have been used. However, in recent years, studies have been conducted to replace them with lightweight plastic materials.

[0005] As such a non-metallic shading component, the applicant has proposed a shading component for optical equipment, characterized in that it is a shading component for optical equipment having a film substrate and a shading film formed on at least one side of the substrate, the shading film containing a binder resin, carbon black, a granular lubricant and microparticles, the contents of the binder resin and the lubricant being respectively more than 70 weight % and 5 to 15 weight %, and the density of the lubricant being greater than that of the microparticles (see patent document 1).

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2011-123255 Summary of the invention

[0009] Problem that the invention aims to solve

[0010] In the technology of patent document 1, a light-shielding film is provided with a binder resin of more than 70% by weight and microparticles such as silica of about 2 to 5% by weight, and further a prescription containing a specific lubricant of sparse density of 5 to 15% by weight. However, in this prescription, the diffuse reflectivity (550nm) including regular reflection and the diffuse reflectivity (905nm) including regular reflection of the light-shielding film are both as large as more than 5%, and there is still room for improvement in terms of surface reflectivity. In addition, in recent years, from the perspective of design, etc., the popularity of low-gloss and deep black designs with a sense of luxury has been rising, and a reconciliation with this is being sought. However, in the technology of patent document 1, for example, the L* value of the CIE 1976L*a*b* color space is more than 25, and there is still room for improvement even in terms of blackness.

[0011] In addition, generally speaking, the surface reflectivity of the light-shielding film has a tendency to decrease as the surface roughness (Ra, Rz, etc.) of the light-shielding film increases. On the other hand, there is a tendency that the L* value of the CIE 1976L*a*b* color space increases as the surface roughness (Ra, Rz, etc.) of the light-shielding film increases. That is, in the design guide described in Patent Document 1, when the surface roughness (Ra, Rz, etc.) of the light-shielding film is increased in order to reduce the surface reflectivity of the light-shielding film, the L* value will also increase at the same time, and the three of low surface reflectivity, low L* value, and low surface roughness cannot be achieved at the same time. Therefore, a new design guide that can achieve these three at the same time is sought.

[0012] The present invention is completed in view of the above-mentioned problems. That is, the object of the present invention is to provide a resin composition or the like having a novel composition that can realize a low-reflection light-shielding layer with a small surface reflectivity and L* value. In addition, another object of the present invention is to provide a resin composition or the like having a novel composition that can realize a low-reflection light-shielding layer with a small surface reflectivity, L* value and surface roughness.

[0013] Furthermore, another object of the present invention is to provide a low-reflection light-shielding layer and a low-reflection light-shielding layer laminate with a small surface reflectivity and L* value. In addition, another object of the present invention is to provide a low-reflection light-shielding layer and a low-reflection light-shielding layer laminate with a small surface reflectivity, L* value and surface roughness. Furthermore, the present invention is to provide a high-performance low-reflection component, a low-reflection component for optical equipment, and a light-shielding low-reflection component for optical equipment, etc., which use the above-mentioned low-reflection light-shielding layer and the low-reflection light-shielding layer laminate as a more preferred purpose.

[0014] Means used to solve problems

[0015] The present inventors conducted intensive studies on film surface shape, optical properties, etc. in order to solve the above problems. As a result, they found a resin composition different from that of the prior art. They found that the above problems can be solved by this novel resin composition, and finally completed the present invention.

[0016] [1] A resin composition for a low-reflection light-shielding layer, comprising at least a binder resin, a coloring material, resin particles and a dispersion medium, wherein the binder resin is contained in an amount of 1 to 30% by weight in total, calculated as a solid content relative to the total solid content; the coloring material is contained in an amount of 0.1 to 35% by weight in total, calculated as a solid content relative to the total solid content; and the resin particles are contained in an amount of 50 to 95% by weight in total, calculated as a solid content relative to the total solid content.

[0017] [2] The resin composition for a low-reflection light-shielding layer according to [1] above, wherein the resin particles have an average particle size D of 3 to 20 μm. 50 .

[0018] [3] The resin composition for a low-reflection light-shielding layer according to [1] or [2], wherein the resin particles contain colored resin particles.

[0019] [4] A low-reflection shading layer, which contains at least a binder resin, a coloring material dispersed in the binder resin, and resin particles dispersed in the binder resin, wherein the binder resin is contained in an amount of 1 to 30% by weight relative to the total amount, calculated as solid content; the coloring material is contained in an amount of 0.1 to 35% by weight relative to the total amount, calculated as solid content; and the resin particles are contained in an amount of 50 to 95% by weight relative to the total amount, calculated as solid content.

[0020] [5] The low-reflection light-shielding layer according to [4] above, wherein the resin particles contain colored resin particles.

[0021] [6] The low-reflection light-shielding layer according to [4] or [5] above, wherein the resin particles have an average particle size D of 3 to 20 μm. 50 .

[0022] [7] The low-reflection light-shielding layer according to any one of [4] to [6] above, wherein the surface roughness Ra of one surface side is 0.2 to 0.7 μm.

[0023] [8] The low-reflection light-shielding layer according to any one of [4] to [7] above, wherein the surface roughness Rz on one surface side is 2.0 to 5.0 μm.

[0024] [9] The low-reflection light-shielding layer according to any one of [4] to [8] above, wherein the 550 nm diffuse reflectance (including regular reflection) on one surface side is 0.0% or more and less than 3.0%.

[0025]

[10] The low-reflection light-shielding layer according to any one of [4] to [9] above, wherein the diffuse reflectance at 905 nm (including regular reflection) on one surface side is 0.0% or more and less than 3.0%.

[0026]

[11] The low-reflection light-shielding layer according to any one of [4] to

[10] above, wherein the L* value of the CIE 1976 L*a*b* color space on one surface side is 0 to 18.

[0027]

[12] The low-reflection light-shielding layer according to any one of [4] to

[11] above, which has an optical density OD of 0.5 or more.

[0028]

[13] The low-reflection light-shielding layer according to any one of [4] to

[12] above, which has a thickness of 1 to 30 μm.

[0029]

[14] A low-reflection light-shielding layer laminate, comprising a substrate and the low-reflection light-shielding layer according to any one of [4] to

[13] above, which is provided on at least one main surface side of the substrate.

[0030]

[15] A low-reflection shading layer stack, characterized in that it comprises a substrate film, a low-reflection shading layer described in any one of [4] to

[13] arranged on one main surface side of the substrate film, and a low-reflection shading layer described in any one of [4] to

[13] arranged on the other main surface side of the substrate film.

[0031] Effects of the Invention

[0032] According to the present invention, a resin composition having a novel composition that can realize a low-reflection light-shielding layer with a small surface reflectivity and surface glossiness can be provided. In addition, according to a preferred embodiment of the present invention, a resin composition having a novel composition that can realize a low-reflection light-shielding layer with a small surface reflectivity, L* value and surface roughness can be provided. Moreover, according to the present invention, a low-reflection light-shielding layer having a small surface reflectivity and surface gloss and a low-reflection light-shielding layer laminate can be provided, and according to a preferred embodiment of the present invention, a low-reflection light-shielding layer having a small surface reflectivity, L* value and surface roughness and a low-reflection light-shielding layer laminate can be provided. Therefore, for example, the degradation or reduction of the captured image and detection accuracy of the optical sensor can be suppressed, and the captured image and detection accuracy can be further improved. In addition, since a low-reflection light-shielding layer having a darker black appearance can be realized, the design of various optical devices equipped with it can also be improved. Moreover, according to the present invention, a high-performance low-reflection component, a low-reflection component for optical equipment, and a light-shielding low-reflection component for optical equipment with a novel design that did not exist in the past can also be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic cross-sectional view showing a low-reflection light-shielding layer 21 and a low-reflection light-shielding layer laminate 100 according to one embodiment. DETAILED DESCRIPTION

[0034] Hereinafter, the implementation of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the positional relationship such as up, down, left, and right, unless otherwise specified, is the positional relationship according to the accompanying drawings. In addition, the dimensional ratios of the accompanying drawings are not limited to the ratios shown in the drawings. Among them, the following implementation methods are examples for illustrating the present invention, and the present invention is not limited thereto. It should be noted that, in this specification, the expression of a numerical range such as "1 to 100" includes both its upper limit "100" and its lower limit "1". In addition, the expressions of other numerical ranges are also the same.

[0035] The resin composition for low-reflection light-shielding layer of the first embodiment of the present invention (hereinafter referred to as "resin composition") contains at least a binder resin, a coloring material, resin particles and a dispersion medium. The binder resin, the coloring material and the resin particles only need to be dispersed in the dispersion medium, but a part of them may be dissolved in the dispersion medium.

[0036] As binder resin, known binder resins in the art can be used, and its type is not particularly limited. Specifically, thermoplastic resins or thermosetting resins such as poly (methyl) acrylic resin, polyester resin, polyvinyl acetate resin, polyvinyl chloride resin, polyvinyl butyral resin, cellulose resin, polystyrene / polybutadiene resin, polyurethane resin, alkyd resin, acrylic resin, unsaturated polyester resin, epoxy ester resin, epoxy resin, epoxy acrylate resin, urethane acrylate resin, polyester acrylate resin, polyether acrylate resin, phenolic resin, melamine resin, urea resin, diallyl phthalate resin can be listed, but are not particularly limited to these. In addition, thermoplastic elastomer, thermosetting elastomer, ultraviolet curing resin, electron beam curing resin, etc. can also be used. They can be used alone, and more than two kinds can also be used in combination. It should be noted that the binder resin can be appropriately selected for use according to the required performance and purpose. For example, in applications requiring heat resistance, thermosetting resins are preferred.

[0037] The content (total amount) of the binder resin in the resin composition can be appropriately set to the degree necessary for film formation, and is not particularly limited. From the perspective of considering the blending balance with other essential components and arbitrary components, realizing a low-reflection light-shielding layer with a more excellent surface reflectivity and L* value and then having a lower surface roughness as required, the content (total amount) of the binder resin is calculated with respect to the solid component of the total solid component of the resin composition, preferably 1 to 30% by mass, more preferably 2 to 25% by mass, further preferably 3 to 20% by mass, and particularly preferably 5 to 15% by mass. It should be noted that when coloring material and resin particles include a binder resin component, these binder resin components are also included in the total amount of the binder resin in the containing ratio mentioned here.

[0038] As coloring materials, pigments and dyes known in the art can be used, and their types are not particularly limited. By appropriately selecting the type, particle size, and usage of the coloring material, light-shielding properties and light transmittance can be adjusted. Specifically, magnetite black, copper / iron / manganese black, titanium black, carbon black, aniline black, etc. can be cited, but they are not particularly limited to these. As coloring materials, from the viewpoint of the ease of adjustment of light-shielding properties, light transmittance, hue, etc., it is preferred to use black inorganic pigments and black organic pigments. They can be used alone, or two or more can be used in combination. Among these, as coloring materials, inorganic pigments are desired, specifically, preferably titanium black, carbon black, aniline black, and more preferably carbon black and aniline black. As carbon black, it is known that oil furnace black, lamp black, channel carbon black, gas furnace black, acetylene black, thermal carbon black, Ketjen black, etc. are made by various known methods, but their types are not particularly limited. From the viewpoint of imparting conductivity and preventing charging due to static electricity, conductive carbon black is particularly preferably used as a coloring material. Carbon black has a long history, and various grades of carbon black monomers and carbon black dispersions are commercially available from, for example, Mitsubishi Chemical Corporation, ASAHICARBON Corporation, Mikoku Pigment Co., Ltd., Resinocolor Industries Co., Ltd., Cabot Corporation, Degussa Corporation, etc., and can be appropriately selected from these according to the required performance and purpose. They can be used alone or in combination of two or more.

[0039] It should be noted that the particle size of the coloring material can be appropriately set according to the type of coloring material used, the required performance, etc., and is not particularly limited. For example, when the coloring material is carbon black, the average particle size D 50 It is preferably 0.01 to 2.0 μm, more preferably 0.05 to 1.0 μm, and even more preferably 0.08 to 0.5 μm. 50 The median diameter (D) is the volume-based median diameter measured by a laser diffraction particle size distribution analyzer (e.g., SALD-7000, manufactured by Shimadzu Corporation). 50 ).

[0040] The content (total amount) of the coloring material in the resin composition can be appropriately set according to the required performance of light-shielding property, low glossiness, etc., and is not particularly limited. From the perspective of considering the blending balance with other essential components and optional components, a low-reflection light-shielding layer having a more excellent surface reflectance and L* value and a lower surface roughness as required is realized, the content (total amount) of the coloring material is preferably 0.1 to 35% by mass in total, more preferably 1 to 30% by mass in total, further preferably 3 to 20% by mass in total, and particularly preferably 5 to 15% by mass in total, calculated as the solid component relative to the total solid component of the resin composition. It should be noted that the content of the coloring material when using colored resin particles as resin particles is set to the total mass of the above-mentioned coloring material and the mass of the coloring material contained in the resin particles (the total amount of coloring material in the composition).

[0041] As resin particles, resin particles known in the art can be used, and their types are not particularly limited. Specifically, resin particles of fluororesins such as polymethyl methacrylate, polystyrene, polyester, polyurethane, silicone resin, polyvinylidene fluoride, rubber, etc. can be cited, but are not particularly limited to these. They can be used alone, or two or more can be used in combination. In addition, the appearance of the resin particles can be any one of transparent, translucent, and opaque, and is not particularly limited. In addition, the resin particles can be colorless or colored. For example, by using resin particles (colored resin particles) colored in black, gray, purple, blue, brown, red, green, etc., even if the amount of coloring material used is relatively small, a low-reflection light-shielding layer with high optical density and color can be achieved. In addition, by using colored resin particles, the L* value can be greatly reduced, especially compared with the use of inorganic particles such as silica.

[0042] From the viewpoint of obtaining the above-mentioned surface reflectance and L* value, it is preferred that the resin particles have a relatively large particle size. Specifically, the average particle size D of the resin particles is 50 The lower limit is preferably 1 μm or more, more preferably 2 μm or more, further preferably 4 μm or more, and particularly preferably 5 μm or more. In addition, the upper limit is 30 μm or less, more preferably 20 μm or less, and particularly preferably 15 μm or less. It should be noted that from the perspective of productivity, operability, etc., it is sometimes required to use an average particle size D that can suppress the aggregation of resin particles during coating, or even if the resin particles are aggregated, the particle size of the aggregates will not be excessively increased. 50 of resin particles.

[0043] The content (total amount) of the resin particles in the resin composition can be appropriately set according to the required performances such as light-shielding property and low glossiness, and is not particularly limited. From the perspective of considering the blending balance with other essential components and arbitrary components, realizing a low-reflection light-shielding layer with a more excellent surface reflectivity and L* value and then having a lower surface roughness as required, the content (total amount) of the resin particles is calculated by the solid component conversion relative to the total solid component of the resin composition, preferably a total of 50 to 95 mass%, more preferably a total of 55 to 90 mass%, and further preferably a total of 60 to 85 mass%. It should be noted that the content of the resin particles when using the colored resin particles as the resin particles is based on the mass of the resin particles containing the coloring material contained in the resin particles.

[0044] It should be noted that the resin composition of the present embodiment may contain a known color material in addition to the above-mentioned coloring material and resin particles in order to control the color tone. Examples of the color material include diarylmethane series; triarylmethane series; thiazole series; methine series such as merocyanine and pyrazolone methine; azomethine series such as indoaniline, acetophenone methine, pyrazolo methine, imidazole methine, and imidazo methine; xanthene series; oxazine series; cyanomethylene series such as dicyanostyrene and tricyanostyrene; thiazine series; azine series; acridine series; phenylazo series; azo series such as pyridone azo, thiophene azo, isothiazole azo, pyrrole azo, imidazole azo, thiadiazole azo, triazole azo, and disazo; spiropyran series; indolinol and spiropyran series; fluoran series; naphthoquinone series; anthraquinone series; quinoline yellow series, etc., but are not particularly limited to these. For example, the known color material of black series, blue series, green series, yellow series, red series can be used alone as one, and more than two kinds can also be used in combination in addition. When using color material, the content (total amount) of color material can be appropriately set according to the required performance, is not particularly limited, but considering the blending balance with other essential components and arbitrary components, with the solid component conversion relative to the solid component total amount of resin combination, preferably 0.1 to 10% by mass, more preferably 0.5 to 5% by mass, and more preferably 1 to 3% by mass.

[0045] Furthermore, the resin composition may contain a known matting agent in order to adjust the glossiness, color tone, etc. of the resin composition. Examples of the matting agent include kaolin, calcined kaolin, calcined clay, uncalcined clay, silica (e.g., natural silica, fused silica, amorphous silica, hollow silica, wet silica, synthetic silica, fumed silica, etc.), aluminum compounds (e.g., boehmite, aluminum hydroxide, aluminum oxide, hydrotalcite, aluminum borate, aluminum nitride, etc.), magnesium compounds (e.g., magnesium aluminum silicate, magnesium carbonate, magnesium oxide, magnesium hydroxide, etc.), calcium compounds (e.g., calcium carbonate, calcium hydroxide, calcium sulfate, calcium sulfite, calcium borate, etc.), molybdenum compounds (e.g., molybdenum oxide, zinc molybdate, etc.), talc (e.g., natural talc, calcined talc, etc.), mica (mica), titanium oxide, zinc oxide, zirconium oxide, barium sulfate, zinc borate, barium metaborate, sodium borate, boron nitride, aggregated boron nitride, silicon nitride, carbon nitride, strontium titanate, barium titanate, stannates such as zinc stannate, etc., but the matting agent is not particularly limited to these. They can be used alone or in combination of two or more. When a matting agent is used, the content (total amount) of the matting agent can be appropriately set according to the required performance, and is not particularly limited. However, from the perspective of achieving a low-reflection light-shielding layer with a more excellent surface reflectivity and surface glossiness by considering the blending balance with other essential components and optional components, the total amount is preferably 0.1 to 10% by mass, more preferably 0.5 to 5% by mass, and further preferably 1 to 3% by mass in total, calculated as solid content relative to the total solid content of the resin composition.

[0046] Furthermore, the resin composition may contain various additives known in the art. As specific examples thereof, lubricants, conductive agents, flame retardants, antibacterial agents, mildewproof agents, antioxidants, plasticizers, resin curing agents, curing agents, curing accelerators, leveling agents, flow regulators, defoamers, dispersants, etc. may be cited, but are not particularly limited to these. As lubricants, hydrocarbon lubricants such as polyethylene, paraffin, and wax may be cited; fatty acid lubricants such as stearic acid and 12-hydroxystearic acid; amide lubricants such as stearic acid amide, oleic acid amide, and erucic acid amide; ester lubricants such as butyl stearate and monoglyceride of stearic acid; alcohol lubricants; solid lubricants such as metal soaps, talc, and molybdenum disulfide; polytetrafluoroethylene wax, etc., but are not particularly limited to these. Among these, it is particularly preferred to use organic lubricants. In addition, when using ultraviolet curing resins and electron beam curing resins as binder resins, for example, sensitizers such as n-butylamine, triethylamine, and tri-n-butylphosphine, ultraviolet absorbers, etc. may be used. These may be used alone or in combination of two or more thereof. The proportion of these is not particularly limited, but is generally preferably 0.01 to 5% by mass, respectively, in terms of solid content relative to the total solid content of the resin composition.

[0047] The dispersion medium is not particularly limited, and examples thereof include water; ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; ester solvents such as methyl acetate, ethyl acetate, and butyl acetate; ether solvents such as methyl cellosolve and ethyl cellosolve; alcohol solvents such as methyl alcohol, ethyl alcohol, and isopropyl alcohol, and mixed solvents thereof, but are not particularly limited thereto. The amount of the dispersion medium used is not particularly limited as long as it is sufficient to form a film of a low-reflection light-shielding layer. However, from the viewpoint of operability and workability, it is generally adjusted so that the total solid content of the resin composition is 10 to 90% by mass, preferably 20 to 80% by mass, and more preferably 25 to 70% by mass.

[0048] The low-reflection light-shielding layer 21 of the present embodiment can be obtained by applying the above-mentioned resin composition into a predetermined shape. Figure 1 2 is a cross-sectional view showing a key part of a low-reflection light-shielding layer laminate 100 having the low-reflection light-shielding layer 21. The low-reflection light-shielding layer laminate 100 comprises: a substrate 11, a low-reflection light-shielding layer 21 disposed on one main surface 11a side of the substrate 11, and an adhesive layer 31 disposed on the other main surface 11b side of the substrate 11. That is, the low-reflection light-shielding layer laminate 100 of the present embodiment has a laminated structure (three-layer structure) in which the low-reflection light-shielding layer 21, the substrate 11, and the adhesive layer 31 are arranged in at least this order. It should be noted that in the laminated structure, the low-reflection light-shielding layer 21 is disposed on the outermost surface on the surface side, and the adhesive layer 31 is disposed on the outermost surface on the inner side, and the low-reflection light-shielding layer 21 and the adhesive layer 31 are disposed in a state of being exposed on the outermost surfaces on the surface side and the inner side, respectively. It should be noted that, on the surface 21a of the low-reflection light-shielding layer 21, an antistatic layer, a protective layer, an antifouling layer, an antibacterial layer, an antireflective film, a printed layer, etc. may be provided as needed without departing from the scope of the present invention. In addition, the surface 21a of the low-reflection light-shielding layer 21 may be subjected to any surface treatment such as antistatic treatment, antifouling treatment, antibacterial treatment, antireflective treatment, etc. as needed without departing from the scope of the present invention.

[0049] Here, in the present specification, the phrase "arranged on one (the other) surface side of ..." means not only a scheme in which the low-reflection light-shielding layer 21 and the adhesive layer 31 are directly placed on the surface (e.g., the main surface 11a, the main surface 11b) of the substrate 11 as shown in the present embodiment, but also a scheme in which an arbitrary layer (e.g., a primer layer, an adhesive layer, a conductive layer, etc.) not shown is interposed between the main surface 11a of the substrate 11 and the low-reflection light-shielding layer 21, and between the main surface 11b of the substrate 11 and the adhesive layer 31, so that the low-reflection light-shielding layer 21 and the adhesive layer 31 are separated from the substrate 11 and arranged. In addition, the so-called stacked structure having at least the low-reflection light-shielding layer 21 and the adhesive layer 31 means not only a structure in which only the low-reflection light-shielding layer 21 and the adhesive layer 31 are directly stacked on the substrate 11, but also a structure in which an arbitrary layer as described above is further provided between the layers of the three-layer structure.

[0050] The type of the substrate 11 is not particularly limited as long as it can support the low-reflection light-shielding layer 21 and the adhesive layer 31. Specific examples of the substrate 11 include metals, alloys, resin moldings, resin films, nonwoven fabrics, and glass, but are not particularly limited to these. As metals and alloys, it is preferred to use metal materials containing aluminum, magnesium, iron, and alloys thereof. In addition, from the viewpoints of dimensional stability, mechanical strength, and light weight, it is preferred to use synthetic resins as the substrate 11. Specific examples of synthetic resins include polyesters, ABS (acrylonitrile-butadiene-styrene), polyimides, polyamides, polyamide-imides, polystyrenes, polycarbonates, (meth) acrylic acid series, nylon series, polyolefin series such as polyethylene and polypropylene, addition copolymers of norbornenes and α-olefins, hydrogenated ring-opening metathesis polymers of norbornenes, cycloolefin series such as cyclopentene, cyclohexene, 3-methylcyclohexene, and cyclooctene, cellulose series, polysulfone series, polyphenylene sulfide series, polyethersulfone series, and polyetheretherketone series resins, but are not particularly limited to these. It should be noted that in this specification, "(meth) acrylic acid group" is a concept that includes both acrylic acid group and methacrylic acid group. They can be used alone or in any combination of two or more. In addition, multilayer molded bodies (multicolor molded bodies) and laminated films obtained by using them in any combination can also be used. Among these, as the substrate 11, from the viewpoints of dimensional stability, mechanical strength and light weight, a substrate film of a synthetic resin is preferred, and a polyester film, a polyimide film, a polycarbonate film, a (meth) acrylic film, and a laminated film obtained by combining them in any way are more suitable. In particular, a uniaxial or biaxially stretched film, especially a biaxially stretched polyester film, is particularly preferred due to its excellent mechanical strength and dimensional stability. In addition, in heat-resistant applications, polyimide films, polyamide-imide films, and polyamide films are particularly preferred, and polyimide films and polyamide-imide films are most preferred.

[0051] The thickness of the substrate 11 can be appropriately set according to the required performance and purpose, and is not particularly limited. By providing a low-reflection light-shielding layer 21 on the substrate 11, for example, a substrate 11 as a formed body, or a substrate film as a film-like substrate 11, or a film-like or layered substrate 11 can be given a surface with low surface reflectivity and surface gloss. It should be noted that when using a substrate film as a film-like substrate 11, from the perspective of lightweight and thin film, the thickness of the substrate 11 is 0.5 μm or more and less than 250 μm as the target. From the perspective of strength, rigidity, etc., the thickness of the substrate 11 is preferably 36 μm or more and less than 250 μm. On the other hand, from the perspective of further lightweight and thin film, the thickness of the substrate 11 is preferably 1 μm or more and 50 μm or less, more preferably 1 μm or more and 25 μm or less, further preferably 4 μm or more and 10 μm or less, and particularly preferably 5 μm or more and 7 μm or less. From the viewpoint of improving adhesion with the low-reflection light-shielding layer 21 and the adhesive layer 31 , the surface of the substrate 11 may be subjected to various known surface treatments such as anchor treatment, corona treatment, and antistatic treatment as required.

[0052] It should be noted that the appearance of the substrate 11 can be any one of transparent, translucent, and opaque, and is not particularly limited. For example, a foamed synthetic resin film such as a foamed polyester film, or a synthetic resin film containing various pigments can also be used. For example, by using a synthetic resin film containing more than one dark-colored pigment or dye such as black, gray, purple, blue, brown, red, and green, a film with high optical density can be obtained. As the pigment and dye used here, it can be appropriately selected from the pigments and dyes known in the art, and its type is not particularly limited. For example, as a black-based pigment, black resin particles, magnetite-based black, copper / iron / manganese-based black, titanium black, carbon black, etc. can be listed. Among these, black resin particles, titanium black, and carbon black are preferably used because of their excellent concealment. They can be used alone, or in combination with more than two kinds. When the substrate 11 contains a pigment or dye, its content ratio can be appropriately set according to the required performance and purpose, and is not particularly limited. From the viewpoints of dimensional stability, mechanical strength, and weight reduction, the total content of the pigment and dye is preferably 0.3 to 15% by mass, more preferably 0.4 to 12% by mass, and even more preferably 0.5 to 10% by mass relative to the total amount of the substrate 11 .

[0053] As a method for forming the low-reflection light-shielding layer 21, a known method can be appropriately applied, and it is not particularly limited. The low-reflection light-shielding layer 21 can be obtained by coating and drying the above-mentioned resin composition on the substrate 11 in a manner to become a predetermined thickness, and then performing ionizing radiation treatment, heat treatment and / or pressurization treatment as required. From the perspective of manufacturing a high-performance low-reflection light-shielding layer 21 on the substrate 11 with good reproducibility, simplicity and low cost, it is suitable to use coating methods such as scraping, dipping, roller coating, rod coating, die coating, scraper coating, air knife coating, matching coating, spray coating, spin coating, etc.

[0054] The thickness of the low-reflection shading layer 21 can be appropriately set according to the required performance and purpose, and is not particularly limited. However, from the perspective of the balance between high optical density, lightweight and thin film, it is preferably greater than 1 μm, more preferably greater than 2 μm, further preferably greater than 3 μm, and particularly preferably greater than 4 μm. The upper limit is preferably less than 30 μm, more preferably less than 25 μm, further preferably less than 20 μm, and particularly preferably less than 15 μm.

[0055] In addition, the light-shielding property of the low-reflection light-shielding layer 21 of the present embodiment can be appropriately set according to the required performance and is not particularly limited. From the viewpoint of having a higher light-shielding property, the low-reflection light-shielding layer 21 preferably has an optical density OD of 0.5 or more, more preferably an optical density OD of 1.0 or more, further preferably an optical density OD of 1.7 or more, and particularly preferably an optical density OD of 2.0 or more. It should be noted that in this specification, the optical density (OD) is set to a value measured in accordance with ISO 5-2 using a densitometer (X-Rite361T: X-Rite Company) and an orthogonal filter.

[0056] Adhesive layer 31 is arranged on the main surface 11b side of the above-mentioned substrate 11, and is a layer bonded to an adherend not shown in the figure. In this way, by bonding the adhesive layer 31 side to the adherend, a surface with low reflectivity and low gloss can be given to the adherend. The material constituting the adhesive layer 31 can use materials known in the art, and in addition, it can be appropriately selected according to the surface material of the adherend (resin molded body, multi-layer laminated body using the resin molded body, non-woven fabric and epidermal material, metal, alloy, etc.), and its type is not particularly limited. For example, it is preferred to use rubber adhesive, acrylic adhesive, olefin adhesive, silicone adhesive, urethane adhesive.

[0057] The thickness of the adhesive layer 31 can be appropriately set according to the required performance and application, and is not particularly limited. However, from the perspective of the balance between lightweight and thin film, it is preferably 0.1 μm or more, more preferably 0.2 μm or more, further preferably 0.5 μm or more, particularly preferably 1.0 μm or more, and most preferably 3.0 μm or more. The upper limit is preferably 40 μm or less, more preferably 30 μm or less, further preferably 25 μm or less, particularly preferably 20 μm or less, and most preferably 10 μm or less.

[0058] As described in detail above, the low-reflection light-shielding layer laminate 100 of the present embodiment is provided with the low-reflection light-shielding layer 21 made of the above-mentioned specific resin composition, so that it functions as a laminate film with a small surface reflectivity and L* value. In a more preferred embodiment, it functions as a laminate film with a small surface reflectivity, L* value and surface roughness. Therefore, by using the low-reflection light-shielding layer laminate 100 of the present embodiment as a low-reflection component, a low-reflection component for optical equipment, and a light-shielding component for optical equipment, it is possible to suppress the degradation or reduction of the captured image and detection accuracy of, for example, optical sensors.

[0059] Here, the surface reflectivity of the surface 21a side of the low-reflection light-shielding layer laminate 100 (low-reflection light-shielding layer 21) of the present embodiment can be appropriately set according to the required performance and is not particularly limited. From the perspective of reducing the surface reflectivity and L* value, and also reducing the specular glossiness, the 550nm diffuse reflectivity (including regular reflection) of the surface 21a side of the low-reflection light-shielding layer laminate 100 (low-reflection light-shielding layer 21) is preferably less than 3.0%, more preferably less than 2.8%, further preferably less than 2.6%, and particularly preferably less than 2.4%. Here, the lower limit side of the 550nm diffuse reflectivity is not particularly limited, but the lower the better, so it can be 0.0% or more. Similarly, the 905nm diffuse reflectivity (including regular reflection) of the surface 21a side of the low-reflection light-shielding layer laminate 100 (low-reflection light-shielding layer 21) is preferably less than 3.0%, more preferably less than 2.8%, further preferably less than 2.6%, and particularly preferably less than 2.4%. Here, the lower limit side of the 905nm diffuse reflectivity is not particularly limited, but the lower the better, so it only needs to be 0.0% or more. It should be noted that in this specification, 550nm diffuse reflectivity and 905nm diffuse reflectivity (including regular reflection) refer to the values ​​obtained by measuring the diffuse reflectivity (including regular reflection) (%) when incident light of each wavelength using a spectrophotometer (e.g., SolidSpec-3700 (manufactured by Shimadzu Corporation)).

[0060] In addition, the L* value of the CIE 1976 L*a*b* color space on the surface 21a side of the low-reflection light-shielding layer laminate 100 (low-reflection light-shielding layer 21) of the present embodiment can be appropriately set according to the required performance and is not particularly limited. From the perspective of seeking a deeper black appearance, and from the perspective of balancing low gloss, low reflectivity, light absorption, etc., the L* value on the surface 21a side of the low-reflection light-shielding layer laminate 100 (low-reflection light-shielding layer 21) is preferably 0 to 18, more preferably 16 or less, further preferably 14 or less, and particularly preferably 13 or less. Here, the L* value on the surface 21a side of the low-reflection light-shielding layer laminate 100 (low-reflection light-shielding layer 21) can be the same as the L* value of the low-reflection film and light-shielding film of the prior art (for example, 19 to 30), but it can be adjusted to a relatively small value by making a film from the above-mentioned specific resin composition, which can be said to be one of the features not found in the prior art. It should be noted that in this specification, the L* value of the L*a*b* color space refers to the value of the L* value of the L*a*b* color space in accordance with JIS Z 8720:2012 using CIE standard illuminant D 65 , a value measured by a spectrophotometer (for example, ZE6000 (manufactured by Nippon Denshoku Co., Ltd.)).

[0061] On the other hand, the surface roughness Ra (arithmetic mean roughness) of the surface 21a side of the low-reflection light-shielding layer stack 100 (low-reflection light-shielding layer 21) of the present embodiment can be appropriately set according to the required performance, and is not particularly limited, but from the perspective of reducing the surface reflectivity and L* value, and reducing the specular gloss, it is preferably 0.2 to 0.7 μm, more preferably 0.2 to 0.6 μm, further preferably 0.2 to 0.5 μm, and particularly preferably 0.3 to 0.5 μm. It should be noted that the surface roughness Ra is a parameter of the height direction of the surface concavity and convexity, as is well known in the art, and represents the average of the absolute value of the height Zx of the roughness curve in the reference length. Here, the surface roughness Ra of the surface 21a side of the low-reflection shading layer stack 100 (low-reflection shading layer 21) can be the same degree as the surface roughness Ra of the low-reflection film and shading film in the prior art (for example, 1.0 to 2.0 μm), but it can be adjusted to a relatively small value by forming a film from the above-mentioned specific resin composition. This can be said to be one of the characteristics that the prior art does not have.

[0062] In addition, the surface roughness Rz (maximum height) of the surface 21a side of the low-reflection light-shielding layer stack 100 (low-reflection light-shielding layer 21) of the present embodiment can be appropriately set according to the required performance, and is not particularly limited, but from the perspective of reducing the surface reflectivity and L* value, and reducing the specular gloss, it is preferably 2.0 to 5.0 μm, more preferably 2.1 to 4.8 μm, further preferably 2.2 to 4.6 μm, and particularly preferably 2.5 to 4.5 μm. It should be noted that the surface roughness Rz of the low-reflection light-shielding layer 21 is a parameter in the height direction of the surface concavity and convexity, as is well known in the art, and represents the sum of the maximum values ​​of the convex height Zp and the concave depth Zv of the roughness curve in the reference length. Here, the surface roughness Rz on the surface 21a side of the low-reflection shading layer stack 100 (low-reflection shading layer 21) can be the same degree as the surface roughness Rz of the low-reflection film and shading film in the prior art (for example, 6 to 12 μm), but it can be adjusted to a relatively small value by forming a film from the above-mentioned specific resin composition. This can be said to be one of the characteristics that the prior art does not have.

[0063] On the other hand, the surface roughness RSm of the surface 21a side of the low-reflection light-shielding layer stack 100 (low-reflection light-shielding layer 21) of the present embodiment can be appropriately set according to the required performance, and is not particularly limited, but from the perspective of reducing the surface reflectance and L* value, it is preferably 20 to 70 μm, more preferably 30 to 65 μm, and further preferably 35 to 60 μm. Here, the surface roughness RSm is a parameter of the length direction (lateral direction) of the surface concave and convex, which represents the average of the length Xs of the roughness curve element in the reference length. That is, it can be understood as the average wavelength of the surface concave and convex. The larger the surface roughness RSm, the smaller the surface reflectance and surface glossiness, and the smaller the mirror glossiness on the wide-angle side. It should be noted that the length direction of the surface concave and convex means a direction in the plane of the low-reflection light-shielding layer 21 determined when the surface roughness RSm is measured. For example, when the low-reflection light-shielding layer 21 is rectangular when viewed from above, it can be any one of the longitudinal direction and the lateral direction in the plane, and its direction is not particularly limited.

[0064] In addition, the surface roughness Rsk of the surface 21a side of the low-reflection light-shielding layer stack 100 (low-reflection light-shielding layer 21) of the present embodiment can be appropriately set according to the required performance, and is not particularly limited, but from the viewpoint of reducing the surface reflectivity and L* value, it is preferably 0.1 to 3.0 μm, more preferably 0.2 to 2.0 μm, and further preferably 0.3 to 1.0 μm. Here, the surface roughness Rsk is a parameter in the height direction (depth direction) of the surface concave and convex, indicating the deflection (skewness) of the roughness curve in the reference length. That is, it can be understood as indicating the symmetry of the convex and concave parts when the average line is taken as the center. The larger the absolute value of the surface roughness Rsk, the smaller the surface reflectivity and surface glossiness, and the smaller the mirror glossiness on the wide-angle side.

[0065] It should be noted that the surface roughness Ra, Rz, RSm and Rsk mentioned above refer to the values ​​measured and calculated according to the JIS standards (JIS B0601-2001 and JIS B 0651-2001). Specifically, according to "Geometric Properties Specifications for Products (GPS) - Surface Properties: Profile Curve Method - Terms, Definitions and Surface Properties Parameters, JIS B 0601: 2001", for example, a three-dimensional surface roughness meter such as a stylus surface roughness measuring machine (SURFCOM 1500SD2-3DF: Tokyo Seimitsu Co., Ltd.) can be used for measurement. In addition, the surface roughness RSm and the like can be calculated using the attached analysis software or general analysis software as needed. More detailed measurement conditions are as follows.

[0066] Measuring length: 4.0mm

[0067] Cut-off wavelength: 0.8mm

[0068] Measuring speed: 0.6mm / s

[0069] Stylus: Single crystal diamond with a tip radius of 2 μm and a 60° apex angle

[0070] It should be noted that the surface glossiness of the surface 21a side of the low-reflection light-shielding layer laminate 100 (low-reflection light-shielding layer 21) of the present embodiment can be appropriately set according to the required performance and is not particularly limited. From the viewpoint of achieving higher matte properties and low surface glossiness, the 60-degree specular glossiness (JIS-Z8741: 1997) of the surface 21a side of the low-reflection light-shielding layer laminate 100 (low-reflection light-shielding layer 21) is preferably 0.0% or more and less than 1.0%, more preferably 0.0% or more and less than 0.5%, further preferably 0.0% or more and less than 0.4%, and particularly preferably 0.0% or more and less than 0.3%. Similarly, the 45-degree specular glossiness (JIS-Z8741:1997) of the surface 21a side of the low-reflection light-shielding layer laminate 100 (low-reflection light-shielding layer 21) is preferably 0.0% or more and less than 1.0%, more preferably 0.0% or more and less than 0.5%, further preferably 0.0% or more and less than 0.4%, particularly preferably 0.0% or more and less than 0.3%. Similarly, the 20-degree specular glossiness (JIS-Z8741:1997) of the surface 21a side of the low-reflection light-shielding layer laminate 100 (low-reflection light-shielding layer 21) is preferably 0.0% or more and less than 0.5%, more preferably 0.0% or more and less than 0.3%, further preferably 0.0% or more and less than 0.2%, particularly preferably 0.0% or more and less than 0.1%. It should be noted that in this specification, the mirror gloss refers to the value obtained by measuring the gloss (mirror gloss) (%) of the surface 21a side of the low-reflection light-shielding layer stack 100 (low-reflection light-shielding layer 21) at specified incident light receiving angles (45°, 60°) using a digital variable-angle gloss meter (Gloss Meter VG7000: Nippon Denshoku Co., Ltd.) in accordance with JIS-Z8741:1997.

[0071] From the viewpoint of having high light-shielding properties as a light-shielding member, the optical density (OD) of the low-reflection light-shielding layer stack 100 as a whole is preferably 1.5 or more, more preferably 2.0 or more, further preferably 2.5 or more, particularly preferably 3.0 or more, and most preferably 4.0 or more. It should be noted that the upper limit of the optical density (OD) is of course 6.0.

[0072] (Variation Example)

[0073] It should be noted that the present invention can be implemented with any changes without departing from the scope of the gist thereof. In the above-mentioned first embodiment, a low-reflection light-shielding layer laminate 100 having a laminated structure in which a low-reflection light-shielding layer 21 is provided on a substrate 11 is shown, but the present invention can be implemented even if the substrate 11 and the adhesive layer 31 are omitted. For example, it can be implemented as a low-reflection light-shielding layer having a single-layer structure consisting of only the low-reflection light-shielding layer 21 by peeling off the low-reflection light-shielding layer 21 from the above-mentioned substrate 11. In addition, similarly, it can be implemented as a low-reflection light-shielding layer laminate having a two-layer laminated structure in which the low-reflection light-shielding layer 21 is provided on the substrate 11 without providing the adhesive layer 31. Furthermore, in the above-mentioned first embodiment, a scheme in which only one layer of low-reflection light-shielding layer 21 is provided on the substrate 11 is shown, but it can be implemented even if a scheme in which a low-reflection light-shielding layer 21 is provided on one main surface 11a side and the other main surface 11b side of the substrate 11 is provided. In addition, a conductive layer can be provided between the substrate 11 and the low-reflection light-shielding layer 21.

[0074] Example

[0075] Hereinafter, examples and comparative examples are given to explain the present invention in detail, but the present invention is not limited by these examples. As long as the present invention does not depart from the gist of the present invention and can achieve the purpose of the present invention, various conditions can be adopted. It should be noted that, unless otherwise specified, "parts" means "parts by mass" below.

[0076] (Example 1)

[0077] On one side of a biaxially stretched PET film (total transmittance (550nm): 89.1%) with a thickness of 50μm serving as a substrate, the following resin composition prepared in the mass ratio described in Table 1 is applied by a rod coating method and dried to form a low-reflection shading layer described in Table 2 on the substrate, thereby preparing a low-reflection shading layer and a low-reflection shading layer laminate of Example 1.

[0078] <Coating liquid for resin layer>

[0079] Binder resin

[0080] (isocyanate curing acrylic resin, resin solid content: 25% by mass)

[0081] Coloring materials

[0082] (Carbon black resin dispersion, average particle size D 50 :25nm)

[0083] Resin particles

[0084] (Black acrylic beads, average particle size D 50 :4.0μm)

[0085] Resin curing agent

[0086] (Polyisocyanate curing agent, solid content: 60% by mass)

[0087] Leveling agent

[0088] (Silicone-based, solid content: 10% by mass)

[0089] Dispersion medium 100 parts by mass

[0090] (MEK:toluene=50:50 mixed solvent)

[0091] [Table 1]

[0092]

[0093] (Examples 2-3)

[0094] As shown in Table 1, the low-reflection light-shielding layer described in Table 2 was formed on the substrate in the same manner as in Example 1 except that the mass ratio of each component was changed, thereby producing low-reflection light-shielding layers and low-reflection light-shielding layer laminates of Examples 2 and 3.

[0095] (Comparative Example 1)

[0096] As shown in Table 1, the low-reflection light-shielding layer and the low-reflection light-shielding layer laminate of Comparative Example 1 were prepared in the same manner as in Example 1 except that the amount of resin particles used was changed.

[0097] (Comparative Example 2)

[0098] As shown in Table 1, the average particle size D 50 A low-reflection light-shielding layer and a low-reflection light-shielding layer laminate of Comparative Example 2 were prepared in the same manner as in Example 1, except that the amorphous silica having a diameter of 9.5 μm was used and the mass ratio of each component was changed.

[0099] The low-reflection light-shielding layer laminates (low-reflection light-shielding layers) of Examples 1 to 3 and Comparative Examples 1 to 2 were subjected to measurement and evaluation of various physical properties under the following conditions.

[0100] (1) Surface roughness Ra, Rz, RSm and Rsk

[0101] The surface roughness Ra, Rz, RSm, and Rsk (unit: μm) of the light shielding layer were measured using a stylus surface roughness measuring machine (SURFCOM 1500SD2-3DF: Tokyo Seimitsu Co., Ltd.) in accordance with the measurement method of the arithmetic mean roughness (Ra) of JIS-B0601 (2001).

[0102] (2) 550nm reflectivity and 905nm reflectivity

[0103] Using a spectrophotometer (eg, SolidSpec-3700 (manufactured by Shimadzu Corporation)), the diffuse reflectance (including regular reflection) (%) of the surface of the light shielding layer when light of wavelengths 550 nm and 905 nm is incident is measured.

[0104] (3)L*

[0105] A spectrophotometer (e.g., ZE6000 (manufactured by Nippon Denshoku Co., Ltd.)) was used in accordance with JIS Z 8720:2012, using CIE standard illuminant D 65 , measure the L* of the surface of the light-shielding layer.

[0106] (4) Specular glossiness

[0107] According to JIS-Z8741:1997, the surface gloss (specular gloss) (%) of the light shielding layer at predetermined incident light angles (20°, 45°, 60°) was measured using a digital variable angle gloss meter (Gloss Meter VG7000: Nippon Denshoku Co., Ltd.).

[0108] (5) Optical density OD

[0109] The optical density of the first resin layer 21 was measured using a densitometer (X-Rite 361T: X-Rite Corporation) in accordance with ISO 5-2. In addition, an orthogonal filter was used for the measurement.

[0110] [Table 2]

[0111]

[0112] Industrial Applicability

[0113] The present invention can be widely and effectively used as a low-reflection light-shielding member in applications requiring low surface reflectivity and a deep black appearance, such as in the fields of precision machinery, semiconductors, optical equipment, in-vehicle applications, theater applications, etc. In particular, it can be particularly effectively used as a light-shielding member (such as a light-shielding plate, a light-shielding ring, etc.) and a sliding member (such as a shutter, an aperture member, etc.) of various optical devices such as high-performance single-lens reflex cameras, compact cameras, video cameras, mobile phones, smart phones, PDA information terminals, and projectors.

[0114] Description of Reference Numerals

[0115] 100 Low reflection light shielding layer laminate

[0116] 11. Substrate

[0117] 11a surface (main surface)

[0118] 11b side (main side)

[0119] 21 Low reflection shading layer

[0120] 21a Surface

[0121] 31 Adhesive layer

Claims

1. A resin composition for a low-reflection light-shielding layer, comprising at least a binder resin, a coloring material, resin particles and a dispersion medium, The content ratio of the binder resin is 1 mass % to 30 mass % based on the total amount in terms of solid content. The content ratio of the coloring material is 3% to 35% by mass in total based on the solid content. The content ratio of the resin particles is 85% by mass to 95% by mass in total based on the solid content. The resin particles have an average particle size D of 3 μm to 20 μm. 50 , The resin particles include colored resin particles.

2. A low-reflection light-shielding layer comprising at least a binder resin, a coloring material dispersed in the binder resin, and resin particles dispersed in the binder resin, The content ratio of the binder resin is 1 mass % to 30 mass % in total in terms of solid content relative to the total solid content. The content ratio of the coloring material is 3% to 35% by mass in total in terms of solid content relative to the total solid content. The content ratio of the resin particles is 85% by mass to 95% by mass in total in terms of solid content relative to the total solid content. The resin particles have an average particle size D of 3 μm to 20 μm. 50 , The resin particles include colored resin particles.

3. The low-reflection light-shielding layer according to claim 2, wherein: The surface roughness Ra of one surface side is 0.2 μm to 0.7 μm.

4. The low-reflection light-shielding layer according to claim 2, wherein: The surface roughness Rz of one surface side is 2.0 μm to 5.0 μm.

5. The low-reflection light-shielding layer according to claim 2, wherein: The diffuse reflectance at 550 nm on one surface side is 0.0% or more and less than 3.0%, The diffuse reflectivity includes specular reflectance.

6. The low-reflection light-shielding layer according to claim 2, wherein: The diffuse reflectance at 905 nm on one surface side is 0.0% or more and less than 3.0%, The diffuse reflectivity includes specular reflectance.

7. The low-reflection light-shielding layer according to claim 2, wherein: The L* value of the CIE 1976 L*a*b* color space on one surface side is 0 to 18. The low-reflection light-shielding layer according to claim 2 , having an optical density OD of 0.5 or more. 9 . The low-reflection light-shielding layer according to claim 2 , having a thickness of 1 μm to 30 μm.

10. A low-reflection light-shielding layer laminate, characterized in that: It has a base material, and The low-reflection light-shielding layer according to any one of claims 2 to 9 provided on at least one main surface side of the substrate.

11. A low-reflection light-shielding layer laminate, characterized in that: It has a base film, a low-reflection light-shielding layer according to any one of claims 2 to 9 provided on one main surface side of the base film, and The low-reflection light-shielding layer according to any one of claims 2 to 9 provided on the other main surface side of the base film.

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