TW202146942A - Low-reflection materials - Google Patents

Abstract

The present invention provides a low-reflection material with low surface reflectivity and surface gloss, etc. The low-reflection material is characterized by having at least: a low-reflection sprayed coating having a thickness of 3-100 µm and containing at least a binder resin, a coloring material dispersed in said binder resin, and resin particles dispersed in said binder resin. The surface roughness RSm of the surface side on one side of said low-reflection sprayed coating is 80-180 µm and the surface roughness Rsk of the same surface side is less than 0.5 µm. The surface roughness Ra of said surface side of said low-reflection sprayed coating is 0.5-15.0 µm, and the surface roughness Rz of the same surface side is preferably 3-70 µm.

Description

low reflection material

The present invention relates to a low-reflection material and the like that reduce surface reflectance and surface gloss.

It is used in various optical devices such as single-lens reflex cameras, compact cameras, video recorders, smartphones, etc., from the viewpoint of removing unnecessary incident light or reflected light and suppressing the occurrence of halos, lens flares, ghosting, etc. A light-shielding member with high light-shielding properties and low gloss. For example, it is used to cut off a shading plate for unnecessary light, or to mount a lens unit or a camera module between the lenses, such as a correction coil, in various optical devices. In addition, from the viewpoint of preventing the occurrence of halos and ghost images caused by external light, in the shutters and aperture members of various optical devices such as single-lens reflex cameras, compact cameras, and video recorders, light-shielding devices are used. member.

On the other hand, due to the remarkable progress of sensing technology in recent years, various moving objects (hereinafter, there are In the case of a so-called "moving vehicle"), the introduction of height sensing technology is being studied. As an example, in order to detect obstacles (such as other vehicles, pedestrians, guardrails, houses, etc.) in front of the own vehicle, an optical sensor such as a lens unit (camera module) with an image element or an infrared sensor is installed The development of an in-cabin car is in progress.

Conventionally, as a light-shielding member for various optical devices, the present applicant has proposed a light-shielding member for optical devices, which is a light-shielding member for optical devices having a film base material and a light-shielding film formed on at least one side of the base material. The light-shielding film system contains binder resin, carbon black, particulate lubricant and fine particles. The content of the binder resin and the lubricant is 70% by weight or more and 5 to 15% by weight, respectively. The density of the lubricant system is higher than that of the aforementioned The fine particles are larger (refer to Patent Document 1). [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2011-123255

[The problem to be solved by the invention]

In the technology of Patent Document 1, the light-shielding film contains 70% by weight or more of binder resin and about 2 to 5% by weight of fine particles such as silicon dioxide, and further contains a specific lubricant with sparse density 5 to 15%. % by weight of the prescription, to achieve good shading. However, in this formulation, the 550nm diffuse reflectance and 905nm diffuse reflectance (905nm) of the surface of the light-shielding film are both greater than 5%, and there is still room for improvement in terms of surface reflectance in order to be used as a low-reflection material. Furthermore, in the technology of Patent Document 1, although the matteness with a 60° specular gloss of about 1.8 to 7.6% is achieved, the realization of a low-reflection material with a lower specular gloss is expected. First, in the technique of Patent Document 1, since no consideration is given to the specular gloss on the wide-angle side (for example, the 75-degree specular gloss or the 85-degree specular gloss), the defect is caused by the specular gloss on the wide-angle side. The impact still lingers. Therefore, improvements such as imaging and sensing that require higher precision are being sought.

In addition, in recent years, from the viewpoint of design, etc., a high-quality low-gloss and deep black design is gaining popularity, and a harmony with it is being sought. However, in the technique of Patent Document 1, for example, in the CIE 1976 L ^* a ^* b ^* color system, the L ^* value is 25 or more, and there is still room for improvement even at the point of blackness.

The present invention has been accomplished in view of the above-mentioned problems. That is, the present invention provides a low-reflection material and the like with small surface reflectance and surface gloss. Moreover, another object of this invention is to provide the novel low reflection material etc. which reduce the specular glossiness of the wide angle side especially. Furthermore, the present invention is to provide a high-performance low-reflection member using these low-reflection materials, especially a low-reflection member having a ^{low L*} value and providing deep black design properties, and a low-reflection member for optical equipment etc. as the purpose. [means to solve the problem]

In order to solve the above-mentioned problems, the present inventors have made efforts to study the surface shape and optical properties of the low-reflection layer, and found that the low-reflection spray layer in which the coloring material and resin particles are dispersed in a binder resin has a novel surface that has not been seen before. shape, and found that with this novel surface shape, lower surface reflectivity and lower surface gloss were brought, and finally the present invention was completed.

[1] A low-reflection material characterized by at least comprising: a binder resin, a coloring material dispersed in the binder resin, and resin particles dispersed in the binder resin. For the spray coating, the surface roughness RSm of the surface side of the low-reflection spray coating system is 80 to 180 μm, and the surface roughness Rsk of the same surface side is less than 0.5 μm.

[2] The low-reflection material according to the above [1], wherein the surface roughness Ra on the surface side of the low-reflection spray coating is 0.5 to 15.0 μm, and the surface roughness on the surface side of the low-reflection spray coating is 0.5 to 15.0 μm. Rz is 3 to 70 μm. [3] The low-reflection material according to the above [1] or [2], wherein the surface roughness Ra of the surface side of the low-reflection spray coating is 0.8 to 10.0 μm, and the surface side of the low-reflection spray layer is The surface roughness Rz is 6~60μm.

[4] The low-reflection material according to any one of the above [1] to [3], wherein the content of the binder resin is 1 to 30% by mass in total with respect to the low-reflection spray coating, and the above The content ratio of the coloring material is 0.1 to 35 mass % in total relative to the total amount of the low-reflection spray coating, and the content ratio of the resin particles is 50 to 95 mass % in total relative to the total amount of the low-reflection spray coating. .

[5] The low-reflection material according to any one of the above [1] to [4], wherein the resin particles contain colored resin fine particles. [6] The low-reflection material according to any one of the above [1] to [5], wherein the resin particles have an average particle diameter D _{50 of} 3 to 20 μm.

[7] The low-reflection material according to any one of the above [1] to [6], wherein the 85-degree specular gloss (JIS-Z8741:1997) on the surface side of the low-reflection spray coating is 0.0% Above and less than 9.0%. [8] The low-reflection material according to any one of the above [1] to [7], wherein the diffuse reflectance (including regular reflection) at 550 nm on the surface side of the low-reflection spray coating is 0.0% or more and not less than 0.0%. Full 3.0%. [9] The low-reflection material according to any one of the above [1] to [8], wherein the diffuse reflectance (including regular reflection) at 905 nm on the surface side of the low-reflection spray coating is 0.0% or more and not less than 0.0%. Full 3.0%. [10] The low-reflection material according to any one of the above [1] to [9], wherein ^{the L*} value ^{of the CIE 1976 L*} a ^* b ^* colorimetric system of the low-reflection spray coating on the surface side is 0~18. [11] The low-reflection material according to any one of the above [1] to [10], wherein the low-reflection sprayed layer has an optical density OD of 0.5 or more. [12] The low-reflection material according to any one of the above [1] to [11], wherein the low-reflection spray coating layer has light transmittance.

[13] The low-reflection material according to any one of the above [1] to [12], further comprising a base material, wherein the low-reflection spray coating is provided on at least one main surface side of the base material. [14] The low-reflection material according to any one of the above [1] to [12], further comprising a base film, wherein the low-reflection spray coating is provided on the main surface on one side of the base film, respectively side and the main side of the other side. [Inventive effect]

According to the present invention, it is possible to realize a low-reflection material with low surface reflectance and surface gloss, and the like, for example, it is possible to suppress deterioration or decrease in image pickup or detection accuracy of an optical sensor. In addition, in order to realize a low-reflection material having a deeper black appearance, etc., the design properties of various optical devices mounted thereon can also be improved. Furthermore, according to a further suitable aspect of the present invention, a novel low-reflection material or the like that reduces the specular gloss on the wide-angle side can be provided, making it possible to further improve the captured image or detection accuracy. By using these low-reflection materials, for example, even when viewed from a wide angle side, a matte finished product with a small surface gloss can be realized, and a low-reflection material with a novel design that has not existed in the past can also be realized, using This low-reflection material has a high-performance low-reflection member, especially a low-reflection member with a low L ^* value and can provide deep black design, a low-reflection member for optical equipment, and the like.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The positional relationship of up, down, left, right, etc., unless otherwise specified, is determined according to the positional relationship shown in the drawings. In addition, the dimension ratio of a figure is not limited to the ratio of the figure. However, the following embodiments are examples for explaining the present invention, and the present invention is not limited to these. Furthermore, in this specification, for example, a table defined as a numerical range of "1 to 100" is described as including both the upper limit value "100" and the lower limit value "1". In addition, the notation of other numerical ranges is also the same.

(first embodiment) FIG. 1 is a cross-sectional view showing an essential part of a low-reflection material 100 according to the first embodiment of the present invention. The low-reflection material 100 includes a base material 11 , a low-reflection spray coating 21 with a thickness of 3 to 100 μm provided on the main surface 11 a on one side of the base material 11 , and a low-reflection coating layer 21 provided on the other side of the base material 11 . The adhesive layer 31 on the side of the main surface 11b. That is, the low-reflection material 100 of the present embodiment has a laminated structure (three-layer structure) in which at least the low-reflection spray layer 21 , the base material 11 and the adhesive layer 31 are arranged in this order. Also, in this laminated structure, the low-reflection spray coating 21 is arranged on the outermost surface of the front side, and the adhesive layer 31 is arranged on the innermost surface, and the low-reflection sprayed layer 21 and the adhesive layer 31 are exposed on the outermost surface of the front side and the inner side, respectively. State configuration. Furthermore, on the surface 21a of the low-reflection spray coating 21, within the scope of not departing from the spirit of the present invention, an antistatic layer or a protective layer or an antifouling layer or an antibacterial layer or an anti-reflection film or a printing layer can be provided if necessary. Floor. In addition, the surface 21a of the low-reflection coating layer 21 may be subjected to any surface treatment such as antistatic treatment, antifouling treatment, antibacterial treatment, or antireflection treatment if necessary without departing from the gist of the present invention.

Here, in this specification, the term "~ is provided on the surface side of one side (the other side)" means not only including the surface (eg, the main surface 11a or the main surface 11b) of the base material 11 as in the present embodiment. The state of being directly placed on the low-reflection spray layer 21 or the adhesive layer 31 is also included between the main surface 11a of the substrate 11 and the low-reflection spray layer 21 or between the main surface 11b of the substrate 11 and the adhesive layer 31 A state in which the low-reflection spray layer 21 or the adhesive layer 31 is separated from the base material 11 through any layer (for example, a primer layer, an adhesive layer, etc.) not shown. In addition, the so-called laminated structure having at least the low-reflection spray coating 21 and the adhesive layer 31 means not only the structure in which only the low-reflection spray coating 21 and the adhesive layer 31 are directly laminated on the base material 11, but also the structure of the three-layer structure. The structure of the above-mentioned arbitrary layers is further provided between the layers.

The type of the base material 11 is not particularly limited as long as it can support the low-reflection spray coating 21 and the adhesive layer 31 . Specific examples of the base material 11 include, for example, metals, alloys, resin moldings, resin films, nonwoven fabrics, and glass, but are not particularly limited to these. As the metal or alloy, aluminum, magnesium, iron, and metal materials including alloys thereof are preferably used. In addition, from the viewpoints of dimensional stability, mechanical strength, weight reduction, and the like, it is preferable to use a synthetic resin as the base material 11 . Specific examples of synthetic resins include polyester; ABS (acrylonitrile-butadiene-styrene); polyimide; polyimide; polyimide; polystyrene; polycarbonate; (meth)acryloyl-based; nylon-based; polyolefin-based such as polyethylene or polypropylene; addition copolymers of norbornenes and α-olefins, hydrogenation ring-opening metathesis polymerization of norbornenes Cycloolefins, cyclopentene, cyclohexene, 3-methylcyclohexene, cyclooctene, etc.; cellulose; resins, but are not particularly limited to these. In addition, in this specification, "(meth)acryloyl group" is a concept including both an acryl group and a methacryloyl group. These may be used individually by 1 type, and may be used in arbitrary combination of 2 or more types. Moreover, it is also suitable to use a multilayer molded body (multi-color molded body) or a laminated film in any combination of these. Among these, as the base material 11, from the viewpoints of dimensional stability, mechanical strength, weight reduction, etc., a base film of synthetic resin is preferable, and polyester film, polyimide film, polyimide film, etc. are more preferably used. Carbonate films, (meth)acryloyl-based films, and any combination of these laminated films. First, uniaxially or biaxially stretched films, especially biaxially stretched polyester films, are particularly preferred because they are excellent in mechanical strength and dimensional stability. In addition, for heat-resistant applications, polyimide films, polyimide films, and polyimide films are particularly preferred, and polyimide films and polyimide films are particularly preferred.

The thickness of the base material 11 can be appropriately set according to the required performance and application, and is not particularly limited. By disposing the low-reflection spray coating 21 on the substrate 11, for example, the substrate 11 of the molded body, the substrate film of the film-like substrate 11, and the film-like or layered substrate 11 can be provided with surface reflection. Surface with low rate and surface gloss. In addition, when using the base film of the film-like base material 11 , from the viewpoint of weight reduction and thinning, the thickness of the base material 11 is set to be 0.5 μm or more and less than 250 μm. From the viewpoint of strength, rigidity, etc., the thickness of the base material 11 is preferably 36 μm or more and less than 250 μm. On the other hand, from the viewpoint of further weight reduction and film reduction, the thickness of the base material 11 is preferably 1 μm or more and 50 μm or less, more preferably 1 μm or more and 25 μm or less, still more preferably 4 μm or more and 10 μm or less, and particularly Preferably it is 5 micrometers or more and 7 micrometers or less. Furthermore, from the viewpoint of improving the adhesion with the low-reflection spray coating 21 or the adhesive layer 31, if necessary, the surface of the base material 11 can also be subjected to various well-known surface treatments such as anchoring treatment, corona treatment, and antistatic treatment. .

Furthermore, the appearance of the substrate 11 can be any one of transparent, translucent, and opaque, which 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 one or more dark-colored pigments or dyes such as black, gray, violet, blue, brown, red, and green, a film with a high optical density can be used. The pigment or dye used here can be appropriately selected from those known to those skilled in the art of the present invention, and the type thereof is not particularly limited. For example, black resin particles, magnetite-based black, copper-iron-manganese-based black, titanium black, carbon black, etc. are mentioned as black-based pigments. Among these, black resin particles, titanium black, and carbon black are preferable because they are excellent in concealability. These may be used individually by 1 type, and may be used in combination of 2 or more types. When the base material 11 contains pigments or dyes, the content ratio can be appropriately set according to the required performance and application, and is not particularly limited. From the viewpoints of dimensional stability, mechanical strength, weight reduction, etc., the content ratio of the total of pigments and dyes is preferably 0.3 to 15% by mass, more preferably 0.4 to 12% by mass, relative to the total amount of the base material 11 . %, more preferably 0.5 to 10% by mass.

The surface roughness system RSm of the surface 21a side (surface 21a exposed on the other side in this embodiment) of the low-reflection spray coating 21 of this embodiment is 80-180 micrometers, and it is necessary for Rsk to be less than 0.5 micrometers. Such a special surface shape has not been realized or known in the low-reflection film or light-shielding film of the prior art, thereby achieving a smaller surface reflectivity and surface gloss, and especially reducing the wide angle Specular gloss on the side.

The surface roughness RSm is a parameter of the longitudinal direction (lateral direction) of the surface unevenness, and at the reference length, it represents the average of the length Xs of the roughness curve elements. That is, it can be grasped as the average wavelength of the surface unevenness. Furthermore, the length direction of the surface unevenness refers to a direction in the plane of the low-reflection spray coating 21 determined during the measurement of the surface roughness RSm. Either the direction or the lateral direction in the plane is not particularly limited. The surface roughness RSm of the low-reflection sprayed layer 21 is 80-180 μm, which is larger than the surface roughness RSm of the low-reflection film or the light-shielding film of the prior art, which is about 20-70 μm. The surface roughness RSm of the low-reflection spray coating 21 is preferably 90-170 μm, more preferably 100-160 μm. The larger the surface roughness RSm, the smaller the surface reflectance and the surface gloss, the lower the specular gloss on the wide-angle side, and the lower the coating film strength.

On the other hand, the surface roughness Rsk is a parameter of the height direction (depth direction) of the surface irregularities, and represents the skewness of the roughness curve at the reference length. That is, it can be grasped as showing the symmetry of the convex portion and the concave portion when the average line is taken as the center. The surface roughness Rsk of the low-reflection spray coating 21 is less than 0.5 μm, which is a very small value or a negative value in contrast to the surface roughness Rsk of the low-reflection film or light-shielding film of the prior art, which is a positive value (about 3-7 μm). value. The surface roughness Rsk of the low-reflection spray coating 21 is preferably less than 0.5 μm, more preferably 0.0 μm or less, still more preferably -1.0 μm or less, preferably -7 μm or more, more preferably -5 μm or more, and even more It is preferably -3 μm or more. The smaller the absolute value of the surface roughness Rsk, the smaller the surface reflectance and the surface glossiness, and the smaller the specular glossiness on the wide-angle side tends to be.

As described above, the low-reflection sprayed layer 21 having a surface shape that satisfies the above-mentioned conditions of surface roughness Rsk and RSm can be conceptually grasped as having a surface unevenness that has a relatively large average wavelength in the longitudinal direction, and that in the height direction, compared with The concave part has a surface shape with many convex parts. By controlling such a special surface shape, compared with the prior art, it is possible to realize a low-reflection material with low surface reflectance and surface gloss, and particularly low specular gloss on the wide-angle side. The inventors discovered that. The reason for this has not yet been determined, but it is considered that the surface shape satisfying the above-mentioned conditions of surface roughness Rsk and RSm has internal diffusivity and external diffusivity, which are sufficiently large and maintainable as compared with the prior art. The technology responds to the difficult incident light on the wide-angle side, and the internal diffusivity and external diffusivity also function effectively.

In addition, the surface roughness Ra (arithmetic mean roughness) of the low-reflection spray coating 21 can be appropriately set according to the required performance, although it is not particularly limited, from reducing the surface reflectivity and surface glossiness, and reducing the mirror surface on the wide-angle side. From the viewpoint of glossiness, it is preferably 0.5 to 15.0 μm, more preferably 0.6 to 14.0 μm, still more preferably 0.7 to 12.0 μm, and particularly preferably 0.8 to 10.0 μm. Here, the surface roughness Ra is known to those skilled in the field of the present invention, and is a parameter in the height direction of the surface asperity, and represents the average of the absolute values of the height Zx of the roughness curve at the reference length. Although the surface roughness Ra of the low-reflection sprayed layer 21 can be the same as the surface roughness Ra of the low-reflection film or the light-shielding film of the prior art, in order to obtain the special surface shape having the above-mentioned surface roughnesses Rsk and RSm, there are some differences. The surface roughness Ra of the low-reflection film or the light-shielding film of the prior art tends to be larger.

In addition, the surface roughness Rz (maximum height) of the low-reflection coating layer 21 can be appropriately set according to the required performance. Although it is not particularly limited, the surface reflectance and surface glossiness can be reduced, and the specular glossiness on the wide-angle side can be reduced. From the viewpoint of thickness, it is preferably 3 to 70 μm, more preferably 4 to 67 μm, still more preferably 5 to 65 μm, and particularly preferably 6 to 60 μm. Furthermore, the surface roughness Rz of the low-reflection spray coating 21 is known to those with ordinary knowledge in the field of the present invention, and is a parameter in the height direction of the surface asperity, and the reference length represents the difference between the height Zp of the convex portion and the depth Zv of the concave portion of the roughness curve. the sum of the maximum values. Although the surface roughness Rz of the low-reflection sprayed layer 21 can be the same as the surface roughness Rz of the low-reflection film or the light-shielding film of the prior art, in order to obtain the special surface shape having the above-mentioned surface roughness Rsk and RSm, there are some aspects. The surface roughness Rz of the low-reflection film or the light-shielding film of the prior art tends to be relatively large.

In addition, the surface roughness RSm, Rsk, Ra and Rz mentioned above mean the value measured and calculated based on JIS standard (JIS B 0601-2001 and JIS B 0651-2001). Specifically, according to "Specifications for Geometric Properties of Products (GPS) - Surface Properties: Contour Curve Method - Terms, Definitions, and Surface Properties Parameters, JIS B 0601:2001", for example, a stylus type surface roughness measuring machine can be used. (SURFCOM 1500SD2-3DF: Tokyo Precision Co., Ltd.) and other three-dimensional surface roughness measurement, and, if necessary, the surface roughness RSm can be calculated using the attached analysis software or general-purpose analysis software. More detailed measurement conditions are as follows. Measuring length: 4.0mm Cutoff wavelength: 0.8mm Measuring speed: 0.6mm/s Stylus: made of single-crystal diamond conical with tip radius of 2μm and apex angle of 60°

The low-reflection sprayed layer 21 having the above-mentioned special surface shape can be formed by forming a film by spraying a coating liquid containing at least a binder resin, a light-shielding material, resin particles and a dispersion medium. In this spray coating process, minute droplets of the coating liquid are respectively attached to the main surface 11a of the base material 11, and at the same time, a part of the dispersion medium is volatilized or removed, and finally the dispersion medium is fully volatilized or removed. By sequentially stacking minute droplets from the coating liquid, minute coating particles (solid particles) of the dispersion medium are removed, and the film forms the low-reflection sprayed layer 21 . In this way, by performing film formation by stacking fine coating particles, the low-reflection sprayed layer 21 having the above-mentioned surface shape (specific surface roughness Rsk and RSm) is obtained for the first time. The average wavelength in the longitudinal direction with surface irregularities is relatively large, and the surface shape of the surface shape with more convexities than the concave parts in the height direction cannot be obtained by the conventional bar coating method. In addition, according to the spray coating method, even if it is a surface other than a flat surface such as a curved surface, an inclined surface, a groove, a protrusion, etc., since the formation of the low-reflection sprayed layer 21 is easy, a surface with low surface reflectivity and surface gloss can be formed on any surface. place.

Hereinafter, examples are given to further illustrate the effects brought about by the novel surface shape of the low-reflection spray coating 21 . Here, on the base film with a thickness of 25 μm, a coloring material containing 1 to 30 mass % of binder resin, 0.1 to 35 mass % _{of a coloring material having an average particle diameter D 50} of 25 nm, and 50 to 95 mass % of A coating liquid comprising resin particles having an average particle diameter D ₅₀ of 4 μm, 0.1 to 10 mass % of a hardener and 0.001 to 1 mass % of a leveling agent mixed if necessary, and a necessary amount of dispersion liquid, by The film formation was performed by a spray method, and those (Examples 1 to 4) in which the low-reflection spray layer 21 having a novel surface shape was provided will be described as an example. And, as a comparison, containing 20 to 30% of the mass of the binder resin, and 20 to 45 mass% average particle diameter D ₅₀ of 25nm of coloring materials, and 30 to 45 mass% average particle diameter D ₅₀ of 9.5 A coating liquid comprising amorphous silica particles of μm, 0.1 to 10 mass % of a hardener and 0.001 to 1 mass % of a leveling agent blended if necessary, and a necessary amount of the dispersion liquid, were applied by bar coating. The film is formed by the method to reproduce the surface shape of the prior art (Examples 5 to 7), and the binder resin containing 20 to 30 mass % is used, and the average particle diameter D ₅₀ of 20 to 45 mass % is 25 nm. Coloring material, 30 to 45 mass % _{of resin particles having an average particle diameter D 50} of 4 μm, 0.1 to 10 mass % of a hardener and 0.001 to 1 mass % of a leveling agent if necessary, and a necessary amount For the coating liquid of the dispersion liquid, a film is formed by a bar coating method, and the surface shape of the conventional technical field is reproduced (Example 8) as an example.

As shown in Table 1, even in any of Examples 1 to 8, the surface roughness Ra (0.5-15.0 μm) and the surface roughness Rz (3 ~70μm) optical density OD of 0.5 or more coating film. Here, Examples 1 to 4 having a surface roughness RSm of 80 to 180 μm and a surface roughness Rsk of less than 0.5 μm are compared with Examples 5 to 8 that do not have such a specific surface shape. Shows excellent performance in surface reflectivity or surface gloss. First of all, it should be noted that Examples 1 to 4 having such specific surface shapes show a particularly small value of the 85° surface glossiness on the wide-angle side. On the other hand, in Examples 5 to 8 which do not have such a specific surface shape, the surface reflectance and the surface gloss remain at the level of the prior art.

Furthermore, the surface reflectance of the low-reflection material 100 of the present embodiment is not limited to the above-mentioned examples, and can be appropriately set according to the desired performance. Specifically, the 550 nm diffuse reflectance (including regular reflection) on the surface 21a side of the low-reflection spray coating 21 is preferably less than 3.0%, more preferably less than 2.5%, still more preferably less than 2.0%, particularly preferably is less than 1.8%. Here, the lower limit side of the diffuse reflectance at 550 nm is not particularly limited, but as long as it can be as low as possible, it should just be 0.0% or more. In addition, the 905 nm diffuse reflectance (including regular reflection) of the surface 21a side of the low-reflection spray coating 21 is preferably less than 3.0%, more preferably less than 2.5%, still more preferably less than 2.0%, and particularly preferably not more than 2.0%. Full 1.8%. Here, the lower limit side of the diffuse reflectance at 905 nm is not particularly limited, but as long as it can be as low as possible, it should just be 0.0% or more. Also, in this specification, the diffuse reflectance at 550 nm or the diffuse reflectance at 905 nm means that a spectrophotometer (such as SolidSpec-3700 (manufactured by Shimadzu Corporation)) is used to measure the diffuse reflectance ( %) of the obtained value. Here, the 550nm diffuse reflectance or the 905nm diffuse reflectance can be adjusted by increasing or decreasing the surface roughness RSm or the surface roughness Rsk. Generally speaking, the larger the surface roughness RSm, the more negative the surface roughness Rsk. Small, the 550 nm diffuse reflectance or the 905 nm diffuse reflectance tends to decrease.

In addition, the surface glossiness of the low-reflection material 100 of the present embodiment is not limited to the above-mentioned example, and can be appropriately set according to desired performance. Specifically, the 85-degree specular gloss on the surface 21a side of the low-reflection spray coating 21 (JIS-Z8741: 1997) preferably more than 0.0% and less than 10.0%, more preferably more than 0.0% and less than 9.0%, even more preferably more than 0.0% and less than 8.0%, particularly preferably more than 0.0% and less than 6.0% . Similarly, the 75-degree specular gloss (JIS-Z8741:1997) of the surface 21a side of the low-reflection spray coating 21 is preferably 0.0% or more and less than 5.0%, more preferably 0.0% or more and less than 4.5%, and still more Preferably, it is 0.0% or more and less than 4.0%, and particularly preferably, it is 0.0% or more and less than 3.0%. Similarly, the 60-degree specular gloss (JIS-Z8741:1997) on the surface 21a side of the low-reflection spray coating 21 is preferably 0.0% or more and less than 1.0%, more preferably 0.0% or more and less than 0.5%, and then More preferably, it is 0.0% or more and less than 0.3%, and particularly preferably 0.0% or more and less than 0.2%.

In this case, from the viewpoint of realizing a wide range of low gloss from the low-angle area to the wide-angle area, and from the viewpoint of balancing low gloss, low reflectivity, light absorption, and the like, the present embodiment The specular gloss on the surface 21a side of the low-reflection spray coating 21 of the low-reflection material 100 is the ratio of 20° specular gloss, 45° specular gloss, 60° specular gloss, 75° specular gloss and 85° specular gloss The total is preferably 15.0% or less, more preferably 12.0% or less, still more preferably 11.0% or less, particularly preferably 10.0% or less, and most preferably 8.0% or less. However, in this specification, the specular gloss refers to the use of a digital variable angle gloss meter (Gloss Meter VG7000: Nippon Denshoku) in accordance with JIS-Z8741: 1997. , 60°, 75°, 85°) of the glossiness (specular glossiness) (%) on the surface 21a side of the low-reflection spray coating 21.

On the other hand, the L ^{* value of the CIE 1976 L*} a ^* b ^* color system on the surface 21a side of the low-reflection spray coating 21 of the low-reflection material 100 of the present embodiment may be appropriately set according to the required performance, and is not particularly limited. . From the viewpoint of seeking a deeper black appearance, and from the viewpoint of the balance of low gloss, low reflectivity, light absorption, etc., the CIE 1976 L ^* a ^* b ^* table of the low-reflection spray coating 21 on the surface 21a side The L ^* value of the color system is preferably 0 to 18, more preferably 16 or less, still more preferably 14 or less, and particularly preferably 13 or less. However, in this specification, the L ^{* value in the L*} a ^* b ^* colorimetric system means that according to JIS Z 8720:2012, using CIE standard illumination D ₆₅ , using a spectrophotometer (such as ZE6000 (Nihon Denshoku Corporation) system)) measured value.

In addition, the light shielding property of the low-reflection sprayed layer 21 of the low-reflection material 100 of the present embodiment may be appropriately set according to the required performance, and is not particularly limited. From the viewpoint of having higher light-shielding properties, the low-reflection spray layer 21 preferably has an optical density OD of 0.5 or more, more preferably has an optical density OD of 1.0 or more, and still more preferably has an optical density OD of 1.7 or more , particularly preferably having an optical density OD of 2.0 or more. In this specification, the optical density (OD) is defined as a value measured using an optical densitometer (X-Rite361T: X-Rite Co., Ltd.) and an orthogonal filter in accordance with ISO 5-2.

On the other hand, the low-reflection sprayed layer 21 of the low-reflection material 100 of the present embodiment may have light transmittance (light transmittance). By using the low-reflection spray coating 21 with light transmittance, the dimming function can be imparted. For example, by passing the light of a light source such as an LED or a backlight at the time of lighting through the low-reflection coating layer 21, a desired character, figure, pattern, etc. can be displayed with a desired illuminance as a display body, a display panel, an illumination panel, etc. The low-reflection component increases the applicable value. The light transmittance of the low-reflection spray coating 21 may be appropriately set according to the required performance, and is not particularly limited. From the viewpoint of having higher light transmittance, the low-reflection sprayed layer 21 preferably has an optical density OD of less than 2.0, more preferably has an optical density OD of less than 1.7, and still more preferably has an optical density of less than 1.0 The concentration OD is particularly preferably an optical concentration OD of less than 0.5.

As described in detail above, the low-reflection material 100 of the present embodiment is provided with the low-reflection sprayed layer 21 having a specific surface shape, and is used as a low-reflection material with low surface reflectivity and surface gloss. As a novel low-reflection material in which the specular gloss on the wide-angle side is particularly reduced, it is possible to realize, for example ^{, a low-reflection member with a low L*} value that can impart a deep black design, a low-reflection member for optical equipment, and the like. Therefore, the low-reflection material 100 of the present embodiment can be used as a low-reflection light-shielding member or a low-reflection light-shielding member for optical equipment by using the low-reflection member as it is, or by combining the low-reflection member and the light-shielding member, to suppress, for example, an optical sensor. Deterioration or lowering of captured images or detection accuracy, etc. Further, as the material constituting the low-reflection spray coating 21, those known to those skilled in the field of the present invention can be used, and the types thereof are not particularly limited. Furthermore, the low-reflection sprayed layer 21 (sprayed layer) obtained by spraying the above-mentioned coating liquid can be defined as containing at least a binder resin, a coloring material dispersed in the binder resin, and a binder resin dispersed in the binder resin. Among the resin particles. In the present embodiment, black pigment particles such as carbon black and aniline black are used as the coloring material, and black colored organic resin particles are used as the resin particles. Hereinafter, the constituent elements of the low-reflection spray coating 21 will be described in more detail.

As the binder resin, those known to those with ordinary knowledge in the field of the present invention can be used, and the type thereof is not particularly limited. Specifically, poly(meth)acrylic resins, polyester-based resins, polyvinyl acetate-based resins, polyvinyl chloride-based resins, polyvinyl butyral-based resins, cellulose-based resins, polystyrene Ethylene/polybutadiene resin, polyurethane resin, alkyd resin, acrylic resin, unsaturated polyester resin, epoxy ester resin, epoxy resin, epoxy resin Acrylate resin, urethane acrylate resin, polyester acrylate resin, polyether acrylate resin, phenol resin, melamine resin, urea resin, diallyl phthalate A thermoplastic resin or a thermosetting resin such as resin is not particularly limited to these. Moreover, a thermoplastic elastomer, a thermosetting elastomer, an ultraviolet curable resin, an electron beam curable resin, etc. can also be used. These may be used individually by 1 type, and may be used in combination of 2 or more types. However, the binder resin can be appropriately selected and used according to the required performance and application. For example, in applications requiring heat resistance, a thermosetting resin is preferable.

The content (total amount) of the binder resin in the low-reflection spray coating 21 can be appropriately set to the extent necessary for film formation, and is not particularly limited. Considering the blending balance with other essential components and optional components, from the viewpoint of realizing the low-reflection spray coating 21 having more excellent surface reflectance and surface gloss, the content (total amount) of the binder resin is relatively low. The total amount of the reflective spray coating 21 is preferably 1 to 30 mass % in total, more preferably 2 to 25 mass % in total, still more preferably 3 to 20 mass % in total, and particularly preferably in total It is 5-15 mass %. Furthermore, when the coloring material or resin particle contains a binder resin component, these binder resin components are also included in the total amount of the binder resin in the so-called content ratio here.

As the coloring material, pigments or dyes known to those with ordinary knowledge in the field of the present invention can be used, and the kinds thereof are not particularly limited. By appropriately selecting the type, particle size, and usage amount of the coloring material, the light-shielding property or the light-transmitting property can be adjusted. Specifically, magnetite-based black, copper-iron-manganese-based black, titanium black, carbon black, aniline black, and the like can be mentioned, but they are not particularly limited. As the coloring material, it is preferable to use a black inorganic pigment or a black organic pigment from the viewpoints of light-shielding properties, light transmittance, ease of adjustment of color tone, and the like. Among these, inorganic pigments are desirable as coloring materials, and specifically, titanium black, carbon black, and aniline black are preferable, and carbon black and aniline black are more preferable. As carbon black, oil furnace black, lamp black, channel black, natural gas furnace black, acetylene black, thermal black, Ketjen black, etc. are known by various known production methods, but they are not particularly limited. its kind. From the viewpoint of imparting conductivity to the coloring material and preventing electrification due to static electricity, it is particularly preferable to use conductive carbon black. Carbon black has a long history, such as Mitsubishi Chemical Co., Ltd., Asahi CARBON Co., Ltd., Yuguo Color Co., Ltd., RESINO COLOR Industrial Co., Ltd., Cabot Corporation, DEGUSSA Corporation, etc., there are various grades of carbon black on the market. Body and carbon black dispersion can be appropriately selected from among them according to the required performance or application. These may be used individually by 1 type, and may be used in combination of 2 or more types.

Furthermore, the particle size of the coloring material can be appropriately set according to the coloring material or type to be used, or the desired properties such as light-shielding properties, light-transmitting properties, and low gloss properties, etc., and is not particularly limited. For example, when the coloring material is carbon black, the average particle diameter D _{50 is} preferably 0.01 to 2.0 μm, more preferably 0.05 to 0.1 μm, and even more preferably 0.08 to 0.5 μm. Furthermore, the mean particle diameter D _{50 in this specification refers to the volume-based median diameter (D 50} ) measured by a laser diffraction particle size distribution analyzer (eg, SALD-7000 from Shimadzu Corporation).

The content (total amount) of the coloring material in the low-reflection spray layer 21 can be appropriately set according to the desired properties such as light-shielding properties, light-transmitting properties, and low-gloss properties, and is not particularly limited. From the viewpoint of realizing the low-reflection spray coating 21 having more excellent surface reflectance and surface gloss in consideration of the blending balance with other essential components and optional components, the content (total amount) of the coloring material is relative to the low-reflection coating. The total amount of the spray layer 21 is preferably 0.1 to 35 mass % in total, more preferably 1 to 30 mass % in total, still more preferably 3 to 20 mass % in total, and particularly preferably 5 to 15% by mass. Furthermore, the content of the coloring material when using colored resin particles as the resin particles is determined as the sum of the mass of the coloring material described above and the mass of the coloring material contained in the resin particles (the total amount of the coloring material in the composition).

As resin particles, those known to those with ordinary knowledge in the field of the present invention can be used, and the types thereof are not particularly limited. Specifically, resin particles such as polymethyl methacrylate-based, polystyrene-based, polyester-based, polyurethane-based, and rubber-based resin particles are exemplified, but are not particularly limited to these. These may be used individually by 1 type, and may be used in combination of 2 or more types. In addition, the appearance of the resin particles may be any of transparent, translucent, and opaque, and is not particularly limited. In addition, resin particles may be colorless or colored. For example, by using 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 spray coating 21 with high optical density or chromaticity can be realized.

In order to impart the above-mentioned surface reflectance and surface gloss, the resin particles preferably have relatively coarse particle diameters. View of the low reflection coating layer 21 having more excellent the surface reflectance and surface gloss achieved from the point of view, the average particle diameter D ₅₀ of the resin particles is preferably a lower limit of 1μm or more, more preferably 2μm or more, and still more preferably It is 3 μm or more, particularly preferably 4 μm or more, and most preferably 5 μm or more. Moreover, as an upper limit, 30 micrometers or less are preferable, 20 micrometers or less are more preferable, and 15 micrometers or less are especially preferable. Furthermore, even in the case of suppressing agglomeration of resin particles during coating, or if agglomeration of resin particles is assumed, the use of resin particles having an average particle diameter D ₅₀ such that the particle diameter of aggregates does not become too large is not effective in terms of productivity or handling. It is necessary from the standpoint of sex, etc.

The content (total amount) of the resin particles in the low-reflection spray coating 21 can be appropriately set according to the required properties such as light-shielding properties and low-gloss properties, and is not particularly limited. From the viewpoint of realizing the low-reflection spray coating 21 having more excellent surface reflectance and surface gloss in consideration of the blending balance with other essential components and optional components, the content (total amount) of the resin particles is relative to the low-reflection coating. The total amount of the sprayed layer 21 is preferably 50 to 90 mass % in total, more preferably 55 to 95 mass % in total, and still more preferably 60 to 85 mass % in total. Furthermore, the content of the resin particles when using colored resin particles as the resin particles is based on the mass of the resin particles including the coloring material contained in the resin particles.

In addition, the low-reflection spray layer 21 may contain a known color material other than the above-mentioned coloring material in order to control the color tone. As such color materials, diarylmethane series; triarylmethane series; thiazole series; methine series such as anthocyanin, pyrazolone methine, etc.; Azomethine series of azomethine, imidazomethine, imidazomethine, etc.; xanthene series; oxazine series; cyanogens of dicyanostyrene, tricyanostyrene, etc. Methylene series; Thiazine series; Acridine series; Acridine series; Benzylazo series; , triazole azo, bisazo and other azo series; spiropyran series; indoline spiropyran series; fluoran series; naphthoquinone series; anthraquinone series; quinoline yellow series, etc., but not by Especially limited to these. For example, well-known color materials of black series, blue series, green series, yellow series, and red series can be used alone or in combination of two or more. When using the color material, the content (total amount) of the color material can be appropriately set according to the required performance and is not particularly limited. From the viewpoint of the surface glossiness of the low-reflection sprayed layer 21, the total amount of the low-reflection sprayed layer 21 is preferably 0.1 to 10 mass % in total, more preferably 0.5 to 5 mass % in total, and More preferably, it is 1 to 3 mass % in total.

In addition, the low-reflection sprayed layer 21 may contain a known matting agent (matte agent) in order to adjust the surface glossiness and color tone of the low-reflection sprayed layer 21 . Examples of the matting agent include kaolin, fired kaolin, fired clay, unfired clay, silica (for example, natural silica, fused silica, amorphous silica, hollow silica, wet silica, etc.) Formula silica, synthetic silica, aerosols, etc.), aluminum compounds (such as boehmite, aluminum hydroxide, alumina, hydrotalcite, aluminum borate, aluminum nitride, etc.), magnesium compounds (such as metasilicon magnesium aluminate, magnesium carbonate, magnesium oxide, magnesium hydroxide, etc.), calcium compounds (eg, calcium carbonate, calcium hydroxide, calcium sulfate, calcium sulfite, calcium borate, etc.), molybdenum compounds (eg, molybdenum oxide, zinc molybdate, etc.) etc.), talc (such as natural talc, fired talc, etc.), mica (Mica), titanium oxide, zinc oxide, zirconium oxide, barium sulfate, zinc borate, barium metaborate, sodium borate, boron nitride, agglomerated boron nitride , stannates such as silicon nitride, carbon nitride, strontium titanate, barium titanate, zinc stannate, etc., but are not particularly limited to these. These may be used individually by 1 type, and may be used in combination of 2 or more types. When using a matting agent, the content (total amount) of the matting agent can be appropriately set according to the required performance and is not particularly limited. From the viewpoint of the surface glossiness of the low-reflection sprayed layer 21, the total amount of the low-reflection sprayed layer 21 is preferably 0.1 to 10 mass % in total, more preferably 0.5 to 5 mass % in total, and More preferably, it is 1 to 3 mass % in total.

Furthermore, the low-reflection sprayed layer 21 may contain various additives known to those skilled in the art of the present invention. Specific examples thereof include lubricants, conductive agents, flame retardants, antibacterial agents, antifungal agents, antioxidants, plasticizers, resin hardeners, hardeners, hardening accelerators, levelers, flow conditioners, An antifoaming agent, a dispersing agent, etc. are not specifically limited to these. Examples of lubricants include hydrocarbon-based lubricants such as polyethylene, paraffin, and wax; fatty acid-based lubricants such as stearic acid and 12-hydroxystearic acid; amide stearate, amide oleate, and erucic acid. Amide-based lubricants such as amides; ester-based lubricants such as butyl stearate and monoglyceride stearate; alcohol-based lubricants; solid lubricants such as metal soap, talc, molybdenum disulfide, etc.; polysilicon Oxygen resin particles; fluororesin particles such as polytetrafluoroethylene wax and polyvinylidene fluoride, etc., but are not particularly limited to these. Among these, it is particularly preferable to use an organic lubricant. In addition, when an ultraviolet curable resin or an electron beam curable resin is used as the binder resin, for example, a sensitizer such as n-butylamine, triethylamine, tri-n-butylphosphine, or ultraviolet rays can be used. absorbent, etc. These may be used individually by 1 type, and may be used in combination of 2 or more types. The content ratios of these are not particularly limited, but are generally preferably 0.01 to 5% by mass in terms of solid content relative to the total resin content contained in the low-reflection spray coating 21 .

The thickness of the low-reflection spray coating 21 can be appropriately set according to the required performance and application, and is not particularly limited, but from the viewpoint of a balance between high optical density, weight reduction and thinning, it is preferably 3 μm or more, more preferably 5 μm or more , more preferably 10 μm or more, particularly preferably 20 μm or more, preferably 100 μm or less on the upper limit side, more preferably 70 μm or less, still more preferably 50 μm or less, and particularly preferably 40 μm or less.

Furthermore, in this specification, the so-called spray method, as described above, has been referred to as a coating method using the principle of coating film formation in which the film is formed by stacking fine coating particles (that is, a coating method in which fine droplets are blown). The general term used includes terms such as air spray method, airless spray method, ultrasonic spray method, electrostatic spray method (electrostatic spray method), ink jet method, electrostatic ink jet method, and the like. The dispersion medium that can be used here is not particularly limited, but water; ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; methyl acetate, ethyl acetate, etc. Ester-based solvents such as ester, butyl acetate, etc.; ether-based solvents such as methyl cellosolve, ethyl cellosolve, etc.; alcohol-based solvents such as methyl alcohol, ethyl alcohol, isopropyl alcohol, and the like Mixed solvents, etc., are not particularly limited to these. Furthermore, in order to improve the adhesion between the substrate 11 and the low-reflection sprayed layer 21 , if necessary, various known surface treatments such as anchoring treatment or corona treatment can be performed on the surface of the substrate 11 . In addition, if necessary, an intermediate layer such as an adhesive layer can be provided on the base material 11 in advance, and the low-reflection spray coating 21 can be formed on the intermediate layer. After the film formation in this way, if necessary, ionizing radiation treatment, heat treatment, and/or pressure treatment, etc. are performed to form the low-reflection sprayed layer 21 .

The adhesive layer 31 is provided on the main surface 11b side of the above-mentioned base material 11, and is a layer that is adhesively bonded to an adherend (not shown). In this way, by adhering and bonding the adhesive layer 31 side to the article to be attached, a surface with low reflectance and low gloss can be given to the article to be attached. The material constituting the adhesive layer 31 can be those known to those with ordinary knowledge in the field of the present invention, and the surface material (resin molded body, multilayer laminate using this resin molded body, non-woven fabric, skin material, etc., metal , alloy, etc.) can be appropriately selected, and the type thereof is not particularly limited. For example, it is preferable to use a rubber-based adhesive, an acryl-based adhesive, an olefin-based adhesive, a silicone-based adhesive, and a urethane-based adhesive.

The thickness of the adhesive layer 31 can be appropriately set according to the required performance and application, although it is not particularly limited, but from the viewpoint of the balance between weight reduction and thinning, it is preferably 0.1 μm or more, more preferably 0.2 μm or more, and even more Preferably it is 0.5 μm or more, particularly preferably 1.0 μm or more, most preferably 3.0 μm or more, and the upper limit side is preferably 40 μm or less, more preferably 30 μm or less, still more preferably 25 μm or less, particularly preferably 20 μm or less, and most preferably 10μm or less.

The optical density (OD) of the entire low-reflection material 100 is preferably 1.5 or more, more preferably 2.0 or more, still more preferably 2.5 or more, particularly preferably 3.0 or more, from the viewpoint of having high light-shielding properties as a light-shielding member. The best is above 4.0. Furthermore, it is needless to say that the upper limit value of the optical density (OD) is 6.0. Such a low-reflection material 100 is, for example, as described above, by using a low-reflection spray layer 21 with a high optical density (OD), and/or by using, for example, preferably 1.0 or more, more preferably 2.0 or more, and even more preferably The base material 11 (light-shielding base material) of 3.0 or more, particularly preferably 4.0 or more, and most preferably 5.0 or more, can be easily realized. In addition, by combining another light-shielding layer or light-shielding film with a high optical density (OD) and the low-reflection material 100, high light-shielding properties can also be realized.

On the other hand, from the viewpoint of having light transmittance, the optical density (OD) of the entire low-reflection material 100 is preferably less than 5.0, more preferably less than 4.0, still more preferably less than 3.0, and particularly preferably Less than 2.0, the best is less than 1.0. Furthermore, it is needless to say that the lower limit value of the optical density (OD) is 0. Such a low-reflection material 100 can be easily realized by using a low-reflection spray coating 21 with a low optical density (OD) as described above, or, for example, using a substrate 11 with high light transmittance.

(Variation) Furthermore, in the above-mentioned first embodiment, the low-reflection material 100 having a laminated structure in which the low-reflection spray coating layer 21 is provided on the base material 11 is shown, but the present invention can be implemented even in the aspect in which the base material 11 or the adhesive layer 31 is omitted. . For example, it can be implemented as a low-reflection material of a single-layer structure composed of only the low-reflection sprayed layer 21 by peeling off the above-mentioned base material 11 , or the like. Also, similarly, it can be implemented as a low-reflection material or the like having a two-layer laminate structure in which the low-reflection spray coating layer 21 is provided on the base material 11 without providing the adhesive layer 31 . Furthermore, in the above-described first embodiment, although only one layer of the low-reflection spray coating 21 is provided on the base material 11 , even on the main surface 11 a side and the other main surface 11 b on one side of the base material 11 The aspect in which the low-reflection spray coating 21 is provided on the sides can also be implemented.

In addition, in the above-mentioned first embodiment, the example in which the low-reflection spray coating 21 is applied to the main surface 11a of the film-like substrate 11 is shown, but the object to which the low-reflection spray coating 21 of the present invention is applied is not limited to the above-mentioned The base material 11. For example, by the surface (such as the opening end face, outer peripheral surface, inner peripheral surface, etc.) of various optical machines such as camera modules, lens pedestal supports, lens barrels, etc., or shading of light-shielding plates, correction coils, shutters, aperture members, etc. The surface of the member (for example, the surface, the back, the outer peripheral end face, the inner peripheral end face, etc.) is provided with a low-reflection spray coating 21, which is the same as the above, regardless of whether these surfaces are metal or alloy or resin moldings or multi-color moldings or glass, etc., It can impart a surface with low surface reflectivity and surface gloss, and, in its preferred form, has a ^{low L*} value and can impart a deep black design. [Industrial Availability]

The present invention is used in applications requiring surfaces requiring low reflectivity and low gloss, such as the field of precision machinery, semiconductor fields, optical machinery fields, etc., or in vehicle applications or theater room applications, and can be used as a high-performance low-reflection material in a wide range of applications. use efficiently. First of all, it can be used as a low-reflection shading member (such as a shading plate or correction coil, etc.), or a low-reflection shading member (such as a shading plate or correction coil, etc.) Light-shielding sliding members (such as shutters, aperture members, etc.) are particularly useful.

100: low reflection material 11: Substrate 11a: face (main face) 11b: face (main face) 21: Low reflection spray coating 21a: Surface 31: Adhesive layer

1 is a schematic cross-sectional view showing a low-reflection material 100 according to an embodiment.

Claims (14)

A low-reflection material, which is characterized by at least having: a low-reflection spray coating with a thickness of 3-100 μm containing at least a binder resin, a coloring material dispersed in the aforementioned binder resin, and resin particles dispersed in the aforementioned binder resin, The surface roughness RSm of the surface side of the aforementioned low-reflection spray coating system is 80 to 180 μm, and the surface roughness Rsk of the same surface side is less than 0.5 μm. The low-reflection material according to claim 1, wherein the surface roughness Ra of the surface side of the low-reflection spray coating is 0.5 to 15.0 μm, The surface roughness Rz of the said surface side of the said low reflection sprayed layer is 3-70 micrometers. The low-reflection material according to claim 1, wherein the surface roughness Ra of the surface side of the low-reflection spray coating is 0.8 to 10.0 μm, The surface roughness Rz of the said surface side of the said low reflection sprayed layer is 6-60 micrometers. The low-reflection material according to claim 1, wherein the content of the binder resin relative to the low-reflection spray coating is 1 to 30% by mass in total, The content ratio of the coloring material is 0.1 to 35% by mass in total with respect to the total amount of the low-reflection spray coating. The content ratio of the said resin particle is 50-95 mass % in total with respect to the total amount of the said low-reflection spray coating. The low-reflection material according to claim 1, wherein the resin particles contain colored resin fine particles. The low-reflection material according to claim 1, wherein the resin particles have an average particle diameter D _{50 of} 3 to 20 μm. The low-reflection material according to claim 1, wherein the 85-degree specular gloss (JIS-Z8741:1997) on the surface side of the low-reflection spray coating is 0.0% or more and less than 9.0%. The low-reflection material according to claim 1, wherein the diffuse reflectance (including regular reflection) at 550 nm on the surface side of the low-reflection spray coating is 0.0% or more and less than 3.0%. The low-reflection material according to claim 1, wherein the 905 nm diffuse reflectance (including regular reflection) on the surface side of the low-reflection spray coating is 0.0% or more and less than 3.0%. The low-reflection material according to claim 1, wherein ^{the L*} value ^{of the CIE 1976 L*} a ^* b ^* colorimetric system of the low-reflection spray coating on the surface side is 0-18. The low-reflection material according to claim 1, wherein the low-reflection spray coating has an optical density OD of 0.5 or more. The low-reflection material according to claim 1, wherein the low-reflection spray coating has light transmittance. The low-reflection material according to any one of claims 1 to 12, further comprising a base material, The said low reflection sprayed layer is provided in the main surface side of at least one side of the said base material. The low-reflection material according to any one of claims 1 to 12, further comprising a base film, The low-reflection spray coating is provided on the main surface side of one side and the main surface side of the other side of the base film, respectively.

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