WO2019208136A1 - Light-shielding film and method for manufacturing light-shielding film - Google Patents

Abstract

This light-shielding film includes at least one light-shielding layer having black microparticles distributed therein, wherein the light-shielding layer comprises black microparticles, a photocurable binder resin, and a photoactive compound that activates a polymerization initiator of a binder resin precursor by light irradiation, and the surface of the light-shielding layer has an anti-glare property by having protrusions and recesses thereon.

Description

Light-shielding film and method for producing light-shielding film

The present invention relates to a light shielding film and a method for producing the light shielding film.

As a shutter, a diaphragm member, or a gap adjusting member disposed between a plurality of lenses of an optical device such as a smartphone or a digital video camera, a light shielding film is used as disclosed in Patent Document 1, for example.

The light-shielding film includes, for example, a light-shielding layer containing black pigment, filler particles, and a binder resin and having fine irregularities formed on the surface. The light shielding layer has anti-glare properties that prevent incidents by scattering incident light, and light shielding properties that shield external light that has entered the optical device.

Special table 2010-534342 gazette

In the light-shielding layer, it is desirable to use a photocurable resin as the binder resin from the viewpoint of easy adjustment of the thickness of the light-shielding layer and ensuring scratch resistance during production and handling of the light-shielding film. However, if a light-shielding component such as a black pigment is contained in the light-shielding layer, when a photocurable resin is used as the binder resin, light irradiation becomes insufficient, making it difficult to cure the precursor of the binder resin. There is a risk.

Therefore, an object of the present invention is to make it possible to satisfactorily manufacture a light-shielding film in a light-shielding film having a light-shielding layer having antiglare properties on the surface even when a photocurable resin is used as a binder resin for the light-shielding layer.

In order to solve the above problems, a light-shielding film according to an aspect of the present invention is a light-shielding film including at least one light-shielding layer in which black fine particles are dispersed, and the light-shielding layer includes the black fine particles, It contains a photocurable binder resin and a photoactive compound that activates a polymerization initiator of the precursor of the binder resin by light irradiation, and the surface has antiglare properties by forming irregularities on the surface. Have.

According to the above configuration, since the light shielding layer contains the photoactive compound that activates the polymerization initiator of the binder resin precursor by light irradiation, light irradiation is performed even when the polymerization initiator is shielded from light by the black fine particles. The polymerization initiator can be activated by the photoactive compound thus prepared to promote polymerization of the precursor of the photocurable binder resin. Thereby, while having an unevenness | corrugation in the surface, while having anti-glare property, a light shielding film provided with the light shielding layer containing a photocurable resin can be manufactured favorably.

The glossiness at an incident angle of 85 degrees on the surface of the light shielding layer may be set to a value of 20% or less. As a result, the surface of the light shielding layer can be provided with excellent low glossiness (anti-reflection), and incident light incident on the surface of the light shielding layer can be scattered more favorably.

In the light shielding layer, the content of inorganic fine particles other than the black fine particles or the content of organic fine particles may be set to a value in the range of 0 wt% to 10 wt%. Thereby, it is possible to prevent the light shielding layer from being colored in a color such as white by inorganic fine particles other than black fine particles or organic fine particles. Therefore, it can prevent that the light-shielding property of a light shielding layer falls by these microparticles | fine-particles. Moreover, since it can prevent that the abrasion resistance of a light shielding layer contains these microparticles | fine-particles, it can prevent that a part of light shielding layer is missing and mixed in the inside of an optical apparatus, for example.

The arithmetic average roughness (Ra) on the surface of the light shielding layer may be set to a value in the range of 0.03 μm to 3.0 μm. Thereby, fine unevenness | corrugation can be provided to the surface of a light shielding layer, and incident light in this surface can be scattered still more favorably.

The black fine particles may be spherical, and the primary particle size may be set to a value in the range of 10 nm to 500 nm. Thereby, the black fine particles can be uniformly dispersed in the light shielding layer, and uniform light shielding properties can be obtained in the entire light shielding layer.

The black fine particles may be carbon nanotubes. Thereby, the selection range of the material as black fine particles can be expanded.

The optical density of the light shielding layer in the wavelength range of 380 nm to 780 nm is set to a value of 5.0 or more, and the surface resistance value of the light shielding layer is set to a value of 1 × 10 ¹² Ω / □ or less. It may be. In this way, by setting the optical density and the surface resistance value of the light shielding layer to the predetermined values, it is possible to impart high light shielding properties to the light shielding layer and to further appropriately adjust the electric resistance value of the light shielding layer, It is possible to better prevent the impurities such as adhering to the light shielding layer due to charging of the light shielding layer.

A base film disposed on the surface in contact with the light shielding layer may be further provided. Thereby, a light shielding layer can be favorably supported by a base film. Moreover, while being able to adjust the thickness dimension of a light shielding film easily, the handling can be improved.

The thickness dimension of the base film may be set to a value in the range of 1 μm to 188 μm. Thereby, while being able to adjust the thickness dimension of a light shielding film appropriately, the handling can be improved further more favorably.

The light-shielding film according to an aspect of the present invention is a light-shielding film including at least one light-shielding layer in which black fine particles are dispersed. The light-shielding layer has a pencil hardness set to a value of 2H or more, and is optical. The density is set to a value of 5.0 or more. Thereby, a light shielding film provided with the light shielding layer which has the outstanding hardness and light-shielding property can be obtained.

In one embodiment of the present invention, a method for producing a light-shielding film includes: black fine particles; a precursor of a photocurable binder resin; a polymerization initiator of the precursor of the binder resin; and activation of the polymerization initiator by light irradiation. A deposition step of depositing an uncured material containing a photoactive compound on the surface of the prototype having an anti-glare surface by forming irregularities; and the uncured material on the surface of the prototype And a curing step of forming a light-shielding layer on the surface of which the shape of the surface of the original is transferred by photocuring in a deposited state.

According to the deposition step and the curing step of the above method, since the uncured material contains a photoactive compound that activates the polymerization initiator of the precursor of the binder resin by light irradiation, the polymerization initiator is composed of black fine particles. Even when light is shielded from light, the photoinitiator irradiated with light can activate the polymerization initiator to accelerate the polymerization of the photocurable binder resin precursor. Thereby, while having an unevenness | corrugation in the surface, while having anti-glare property, a light shielding film provided with the light shielding layer containing a photocurable resin can be manufactured favorably.

In the deposition step, a light-transmitting prototype film may be used as the prototype. Thereby, for example, a light-shielding film can be efficiently manufactured by irradiating light with an uncured material through an original film. Moreover, since the prototype is a film, handling is easy, and the prototype can be easily peeled from the light shielding layer.

In the deposition step, a prototype film having a sea-island structure including a plurality of resin components and formed by phase separation of the plurality of resin components may be used as the light transmissive prototype film.

By using such a prototype film as a prototype, irregularities due to the sea-island structure can be transferred to the surface of the light shielding layer with high accuracy. Moreover, the light shielding film 1 which has the outstanding anti-glare property can be manufactured by using the original film which has the sea-island structure formed by the phase separation of several resin component.

In the depositing step, the uncured material is applied to the surface of a support member, and the uncured material is deposited on the surface of the prototype while the uncured material is supported by the support member, and the curing is performed. After the step, the light shielding layer may be peeled off from the master and the support member. Thereby, the light shielding film which consists of a light shielding layer by which the unevenness | corrugation of the surface of the original was transcribe | transferred to the surface can be manufactured favorably.
In the deposition step, the uncured material is applied to at least one surface of the base film, the surface of the prototype is deposited on the uncured material, and after the curing step, the light shielding layer is You may peel from a prototype. Thereby, the light shielding film which has the light shielding layer by which the unevenness | corrugation of the surface of the original pattern was transcribe | transferred by the surface supported by the base film can be manufactured with exact and stable quality.

According to each aspect of the present invention, in a light-shielding film having a light-shielding layer having anti-glare properties on the surface, the light-shielding film can be satisfactorily manufactured even when a photocurable resin is used as a binder resin for the light-shielding layer.

It is sectional drawing of the light shielding film which concerns on 1st Embodiment. It is a manufacturing flowchart of the light shielding film of FIG. It is a figure which shows the mode at the time of manufacture of the light shielding film of FIG. It is sectional drawing of the light shielding film which concerns on 2nd Embodiment. It is sectional drawing of the light shielding film which concerns on 3rd Embodiment. It is a figure which shows the mode at the time of manufacture of the light shielding film of FIG. 10 is an enlarged cross-sectional view showing a prototype according to Modification 1. FIG. 10 is an enlarged cross-sectional view showing a prototype according to Modification 2. FIG.

Hereinafter, each embodiment will be described with reference to the drawings.

(First embodiment)
[Shading film]
FIG. 1 is a cross-sectional view of a light shielding film 1 according to the first embodiment. As an example, the light shielding film 1 is disposed so as to surround the optical axis between a plurality of optical members (lenses and the like) included in the optical device. As shown in FIG. 1, the light shielding film 1 includes at least one light shielding layer 3 in which black fine particles 5 are dispersed. The light shielding film 1 of this embodiment includes a base film 2 and a light shielding layer 3.

The base film 2 is disposed in contact with the light shielding layer 3 on the surface. As an example, the base film 2 is made of a resin film containing a black pigment. Thereby, the base film 2 is colored black. The base film 2 may be colored in a color other than black (for example, white) or may be transparent.

The resin included in the base film 2 may be a thermoplastic resin, a thermosetting resin, or a photocurable resin. Among these, as the thermoplastic resin, for example, polyolefin, styrene resin, acrylic resin, vinyl chloride resin, polyvinyl alcohol resin, polyacetal, polyester, polycarbonate, polyamide, polyimide, polysulfone resin, polyphenylene ether resin, polyphenylene Examples thereof include sulfide resins, fluororesins, and cellulose derivatives. These thermoplastic resins can be used alone or in combination of two or more. Among these, from the viewpoint of ensuring strength, cyclic polyolefin, polyalkylene arylate (polyethylene terephthalate (PET), polyethylene naphthalate (PEN), etc.), polymethyl methacrylate resin, bisphenol A type polycarbonate, and cellulose ester are preferable.

Examples of the thermosetting resin include phenol resin, melamine resin, urea resin, benzoguanamine resin, silicone resin, epoxy resin, unsaturated polyester, vinyl ester resin, and polyurethane. These thermosetting resins can be used alone or in combination of two or more. Of these, epoxy resin, unsaturated polyester, silicone resin, and polyurethane are preferable from the viewpoint of securing strength.

Examples of the photocurable resin include photocurable polyester, photocurable acrylic resin, photocurable epoxy (meth) acrylate, and photocurable urethane (meth) acrylate. These photocurable resins can be used alone or in combination of two or more. Among these, from the viewpoint of ensuring strength, a photocurable acrylic resin and a photocurable urethane (meth) acrylate are preferable. The “photocurable resin” includes a resin that is cured by active energy rays (ultraviolet rays or electron beams).

The base film 2 contains a black pigment so that the side surface in the thickness direction is black. Thereby, the base film 2 is difficult for incident light to pass through the base film 2. Although the thickness dimension of the base film 2 can be set as appropriate, it is set to a value in the range of 1 μm to 188 μm. The thickness dimension of the base film 2 of this embodiment is larger than the maximum thickness dimension of the light shielding layer 3. In addition, the thickness dimension of the base film 2 may be smaller than the maximum thickness dimension of the light shielding layer 3.

Further, an adhesive layer for improving the adhesion to the light shielding layer 3 may be provided on the surface of the base film 2. That is, the base film 2 may have a resin layer and an adhesive layer disposed on the resin layer.

The light shielding layer 3 includes black fine particles 5, a binder resin 6, and a photoactive compound that activates a polymerization initiator of a precursor of the binder resin 6 by light irradiation. The precursor of the binder resin 6 is polymerized by a radical polymerization reaction. The polymerization initiator is activated by the photoactive compound to initiate this polymerization reaction. The binder resin 6 is a photocurable resin. That is, the light shielding layer 3 is formed by curing the binder resin 6 that is a photocurable resin. Examples of the binder resin 6 include the same photo-curable resin as that of the base film 2. By including such a photocurable resin, the light shielding layer 3 of the light shielding film 1 has a pencil hardness set to a value of 2H or higher and an optical density set to a value of 5.0 or higher.

In the light shielding layer 3, black fine particles 5 are dispersed and arranged. Examples of the black fine particles 5 include carbon black, lamp black, vine black, peach black, bone charcoal, carbon nanotube, silver oxide, zinc oxide, magnetite type triiron tetroxide, copper and chromium composite oxide, copper, chromium, Zinc complex oxide, black glass and the like can be mentioned. Since the light shielding layer 3 includes the black fine particles 5, the optical density in the range of wavelengths from 380 nm to 780 nm is set to a value of 5.0 or more. By setting the optical density of the light-shielding layer 3 to a value of 5.0 or more in the range of wavelengths from 380 nm to 780 nm, the light-shielding property of the light-shielding layer 3 is favorably prevented from being deteriorated.

The photoactive compound is a compound that generates thiol by at least one selected from active energy rays, acids and bases. The photoactive compound includes a compound (A1) that generates thiol with active energy rays, a compound (A2) that generates thiol with an acid, and a compound (A3) that generates thiol with a base.

The compound (A1) has a thiol group with a protecting group having an absorption region at a wavelength of 200 nm to 800 nm, or a methyl group in which at least one hydrogen atom is substituted with an organic group having an absorption region at a wavelength of 300 nm to 800 nm. Protected compounds are included. Examples thereof include tris {S- (9-methylfluorenyl)} thiocyanuric acid and S-benzyl-3-mercapto-1,2,4-triazole.

Compound (A2) includes a compound in which a thiol group is protected by a protecting group that is decomposed by an acid. For example, S-acetylthiourea, S-benzoyl-2-mercaptobenzimidazole, S- (2-pyridinylethyl-2-mercaptopyrimidine, S- (t-butoxycarbonyl) -4,6-dimethyl-2-mercaptopyrimidine, etc. Can be mentioned.

Compound (A3) includes a compound in which a thiol group is protected by a protecting group that is decomposed by a base. Examples include 2-mercaptobenzimidazole disulfide, thiocyanuric acid disulfide, and S- (9-fluorenylmethyl) -5-mercapto-1-methyltetrazole.

Of the photoactive compounds that generate thiol by at least one selected from active energy rays, acids and bases, from the viewpoint of thiol generation efficiency, preferred are those represented by the following general formulas (1) to (4). It is a compound. (A) may be used individually by 1 type, and may use 2 or more types together.

In the above formula, R1 to R3 and R5 to R8 are each independently a hydrogen atom or a monovalent hydrocarbon group having a value in the range of 1 to 20 carbon atoms, and R4 has 2 to 30 carbon atoms. A divalent hydrocarbon group having a value in the following range, wherein X1 to X6 are a group in which a bond with a sulfur atom bonded thereto is cut by at least one selected from the group consisting of acids and bases. Is a valent substituent.

The compounds represented by the general formulas (1) to (4) have a common skeleton (—S—C═ (N) —N), and by having this skeleton, oxygen inhibition is suppressed. The effect to do becomes high. Thereby, sclerosis | hardenability improves also on the conditions of at least any one at the time of the exposure at the low exposure amount, and thin film formation.

The light-shielding layer 3 contains a photoactive compound with a value in the range of 0.1 wt% to 5 wt%, for example. More preferably, the light-shielding layer 3 contains the photoactive compound in a value in the range of 1 wt% to 4 wt%. As will be described later, the photoactive compound activates the polymerization initiator dispersed in the precursor of the binder resin 6 when the light shielding layer 3 is manufactured. For this reason, even if the polymerization initiator is not directly irradiated with light, the polymerization initiator is activated when the photoactive compound is irradiated with light.

Although the thickness dimension of the light shielding layer 3 can be set as appropriate, it can be set to a value in the range of 1 μm to 20 μm. As an example, the thickness dimension of the light shielding layer 3 is set to a value in the range of 3 μm to 10 μm.

The black fine particles 5 of the present embodiment are spherical, and the primary particle size is set to a value in the range of 10 nm to 500 nm. The surface resistance value of the light shielding layer 3 is set to a value of 1 × 10 ¹² Ω / □ or less. By setting the surface resistance value of the light shielding layer 3 to 1 × 10 ¹³ Ω / □ or more, the light shielding film 1 can be suitably used as an insulating member.

Irregularities are formed on the surface 3 a of the light shielding layer 3. Thereby, the surface 3a of the light shielding layer 3 has antiglare property. The irregularities formed on the surface 3a of the light shielding layer 3 are formed by transferring the irregularities on the surface 4a of the original pattern 4 during the production of the light shielding film 1, as will be described later. Thereby, the reflection of external light is suppressed on the surface 3 a of the light shielding layer 3.

Specifically, the light shielding layer 3 has antiglare properties by performing the following settings. The light shielding layer 3 has a glossiness of 20% or less at an incident angle of 85 degrees on the surface 3a. In the light shielding layer 3, the arithmetic average roughness (Ra) of the surface 3a is set to a value in the range of 0.03 μm to 3.0 μm. In the light shielding layer 3, the arithmetic average roughness (Sa) of the surface 3a is set to a value in the range of 0.5 μm or more and 5.0 μm or less.

By setting the arithmetic average roughness (Ra) of the surface 3 a of the light shielding layer 3 to a value of 0.1 μm or more, it is possible to easily impart antiglare properties to the surface 3 a of the light shielding layer 3. Moreover, the light shielding layer 3 can be manufactured comparatively easily by setting the arithmetic average roughness (Ra) of the surface 3a of the light shielding layer 3 to a value of 3.0 μm or less.

As for the primary particle size, a photograph of the particle surface magnified 100,000 times with a field emission scanning electron microscope (“JSM-6700F” manufactured by JEOL Ltd.) is taken, and the enlarged photo is further enlarged as necessary. And it can measure as an average particle diameter of the number using a ruler, a caliper, etc. about 50 or more particle | grains.

The optical density in the range of wavelengths from 380 nm to 780 nm is measured by irradiating the sample with a vertically transmitted light beam using an optical densitometer (“X-Rite 341C” manufactured by VideoJet X-Rite Co., Ltd.). It is possible to express the ratio to the state where there is no log in log (logarithm).

The light flux width can be measured as a circle having a diameter of 2 mm. The glossiness is JLS
It is a value measured by a measuring method based on K7105. The arithmetic average roughness (Ra) is a center line average surface roughness, and is a value calculated according to the definition of JIS B 0601 (1994 edition).

As described above, according to the light-shielding film 1, the light-shielding layer 3 contains a photoactive compound that activates the polymerization initiator of the precursor of the binder resin 6 by light irradiation. Even when the light is shielded from light, the photoinitiator irradiated with light can activate the polymerization initiator to promote the polymerization of the precursor of the photocurable binder resin 6. Thereby, while having the unevenness | corrugation in the surface 3a, while having anti-glare property, the light shielding film 1 provided with the light shielding layer 3 containing a photocurable resin can be manufactured favorably.

Further, since the light shielding layer 3 has a glossiness at an incident angle of 85 degrees on the surface 3a set to a value of 20% or less, the surface 3a of the light shielding layer 3 is provided with excellent low glossiness (anti-reflection effect). The incident light incident on the surface 3a of the light shielding layer 3 can be scattered more satisfactorily.

Further, in the light shielding layer 3, the content of inorganic fine particles other than the black fine particles 5 or the content of organic fine particles is set to a value in the range of 0 wt% to 10 wt%. Thereby, it can prevent that the light shielding layer 3 is colored in colors, such as white, by inorganic fine particles other than the black fine particles 5, or organic fine particles. Therefore, it can prevent that the light-shielding property of the light shielding layer 3 falls with these fine particles. Moreover, since it can prevent that the abrasion resistance of the light shielding layer 3 contains these microparticles | fine-particles, it can prevent that a part of light shielding layer 3 is missing and mixed in the inside of an optical instrument, for example.

Further, since the light shielding layer 3 can exhibit antiglare properties without using inorganic fine particles other than the black fine particles 5 or organic fine particles, the black light shielding film 1 with less whiteness can be realized. Thereby, it can suppress that the unnecessary light from the light shielding film 1 injects into the lens of an optical instrument, for example.

Moreover, since the arithmetic mean roughness (Ra) on the surface 3a of the light shielding layer 3 is set to a value in the range of 0.03 μm or more and 3.0 μm or less, the surface 3a of the light shielding layer 3 can be provided with fine irregularities. The incident light incident on the surface 3a can be scattered even better.

Further, since the black fine particles 5 of the present embodiment are spherical and the primary particle size is set to a value in the range of 10 nm to 500 nm, the black fine particles 5 can be uniformly dispersed inside the light shielding layer 3. In addition, uniform light shielding properties can be obtained in the entire light shielding layer 3. In another example, since the black fine particles 5 are Kahn nanotubes, the selection range of materials for the black fine particles 5 can be expanded.

Further, the optical density of the light shielding layer 3 in the wavelength range of 380 nm to 780 nm is set to a value of 5.0 or more, and the surface resistance value of the light shielding layer 3 is set to a value of 1 × 10 ¹² Ω / □ or less. Therefore, the light shielding layer 3 can be provided with a high light shielding property, and the electrical resistance value of the light shielding layer 3 can be adjusted more appropriately, so that impurities such as dust adhere to the light shielding layer due to charging of the light shielding layer. It can prevent well.

Further, since the light shielding film 1 includes the base film 2, the light shielding layer 3 can be favorably supported by the base film 2. Moreover, while being able to adjust the thickness dimension of the light shielding film 1 easily, the handling can be improved. Thereby, for example, the light shielding film 1 can be easily disposed between the plurality of optical members of the optical device.

Moreover, since the thickness dimension of the base film 2 is set to the value of the range of 1 micrometer or more and 188 micrometers or less, the light shielding film 1 can adjust the thickness dimension of the light shielding film 1 appropriately, and also improves the handling more favorably. Can be made.

The light shielding layer 3 of the light shielding film 1 has a pencil hardness of 2H or more and an optical density of 5.0 or more, so that the light shielding layer has excellent hardness and light shielding properties. 3 can be obtained.

[Method for producing light-shielding film]
FIG. 2 is a manufacturing flow diagram of the light shielding film 1 of FIG. FIG. 3 is a diagram showing a state of manufacturing the light shielding film 1 of FIG. As shown in FIG. 2, the manufacturing method of the light shielding film 1 has preparation step S1, deposition step S2, hardening step S3, and peeling step S4. The light shielding film 1 is manufactured by sequentially performing steps S1 to S4. Hereinafter, steps S1 to S5 will be described in detail.

The operator prepares an uncured material 30 as a material for the light shielding layer 3. The uncured material 30 includes black fine particles 5, a precursor of a photocurable binder resin 6, a polymerization initiator of the precursor of the binder resin 6, and a photoactive compound that activates the polymerization initiator by light irradiation. Including. The operator prepares the uncured material 30 so as to have fluidity suitable for coating by mixing these materials and adding a solvent. Thereby, preparation step S1 is performed.

Next, the operator uniformly applies the uncured material 30 to one surface of the base film 2. Thereafter, the volatile components of the uncured material 30 are partially removed by applying hot air to the surface of the uncured material 30.

Thereafter, the operator attaches the surface 4a of the prototype 4 having the antiglare property to the surface 4a due to the formation of irregularities on the surface of the uncured material 30 supported by the base film 2. In the present embodiment, a light-transmitting prototype film having a surface 4 a is used as the prototype 4. Thereby, the deposition step S2 is performed.

Here, the surface 4a of the prototype 4 has a fine uneven shape. As will be described in detail later, the prototype 4 of the present embodiment includes a plurality of resin components, and has a fine concavo-convex shape including a sea-island structure formed by phase separation of the plurality of resin components. The shape of the surface 4 a of the prototype 4 is transferred to the surface 3 a of the light shielding layer 3. That is, the antiglare property imparted to the surface 3 a of the light shielding layer 3 is set by the shape of the surface 4 a of the prototype 4.

Next, the operator irradiates the uncured material 30 supported by the base film 2 through the prototype 4 (in this case, ultraviolet (UV) irradiation) (FIG. 3). As a result, the uncured material 30 is photocured in a state where the uncured material 30 is applied to the surface 4a of the prototype 4, and the light shielding layer 3 in which the shape of the surface 4a of the prototype 4 is transferred to the surface 3a is formed. Thus, the curing step S3 is performed.

Here, the photoactive compound contained in the uncured material 30 activates the polymerization initiator dispersed in the uncured material 30 when irradiated with light. For this reason, even if the polymerization initiator is not directly irradiated with light, the polymerization initiator is activated by the photoactive compound. Therefore, the precursor of the binder resin 6 is well polymerized and cured while preventing the polymerization reaction from being hindered by the black fine particles 5.

Moreover, when the polymerization reaction of the precursor of the binder resin 6 is a radical polymerization reaction, radicals can be generated efficiently by using a photoactive compound, and the binder resin 6 can be obtained at a relatively high curing rate. . In addition, since the photoactive compound acts on the polymerization initiator, it can be applied to a wide variety of monomers that are precursors of the binder resin 6. For this reason, the design freedom of the light shielding layer 3 can be raised. Next, the operator peels the original pattern 4 from the surface 3 a of the cured light shielding layer 3. Thereby, peeling step S4 is performed. Thus, the light shielding film 1 is obtained.

As described above, according to the deposition step S2 and the curing step S3 of the manufacturing method, the uncured material 30 includes a photoactive compound that activates the polymerization initiator of the precursor of the binder resin 6 by light irradiation. Therefore, even when the polymerization initiator is shielded from light by the black fine particles 5, the polymerization initiator is activated by the photoactive compound irradiated with light to promote polymerization of the precursor of the photocurable binder resin 6. Can do. Thereby, while having the unevenness | corrugation in the surface 3a, while having anti-glare property, the light shielding film 1 provided with the light shielding layer 3 containing a photocurable resin can be manufactured favorably.

Also, in the deposition step S2, the light-shielding film 1 can be efficiently manufactured by irradiating the uncured material 30 with light through, for example, the original film by using a light-transmitting original film as the original 4. Moreover, since the prototype 4 is a film, it is easy to handle, and the prototype 4 can be easily peeled off from the light shielding layer 3.

In addition, in the deposition step S2, the surface 4a of the prototype 4 is deposited on the uncured material 30 in a state where the uncured material 30 is applied to at least one surface of the base film 2, and cured after the curing step S3. Since the light-shielding layer 3 is peeled off from the master 4, the light-shielding film 1 having the light-shielding layer 3 supported by the base film 2 and having the unevenness of the surface 4 a of the master 4 transferred to the surface 3 a can be manufactured with accurate and stable quality. .

In the present embodiment, a prototype film including a plurality of resin components and having a sea-island structure formed by phase separation of the plurality of resin components is used as the prototype 4. By using such a prototype film as the prototype 4, the irregularities due to the sea-island structure can be transferred to the surface of the light shielding layer 3 with high accuracy. Moreover, the light shielding film 1 which has the outstanding anti-glare property can be manufactured by using the original film which has the sea-island structure formed by the phase separation of several resin component.

Further, after the curing step S3, the cured light shielding layer 3 is peeled off from the original pattern 4, so that the light shielding film 1 having the light shielding layer 3 supported by the base film 2 and having the unevenness of the surface 4a of the original pattern 4 transferred to the surface 3a. Can be manufactured satisfactorily.

As a modification of the first embodiment, there is a light shielding film in which the base film 2 is omitted. In this case, the light-shielding film is composed only of the light-shielding layer 3. The light shielding film is obtained, for example, by peeling the master 4 and the base film 2 from the light shielding layer 3 in the peeling step S4. Hereinafter, other embodiments will be described focusing on differences from the first embodiment.

(Second Embodiment)
FIG. 4 is a cross-sectional view of the light shielding film 11 according to the second embodiment. As shown in FIG. 4, the light shielding film 11 includes a base film 2 and a pair of light shielding layers 3 disposed on both sides of the base film 2. Each of the pair of light shielding layers 3 is disposed with the surface 3a facing away from the base film 2 side (that is, the outside of the light shielding film 11). The pair of light shielding layers 3 of the light shielding film 11 is manufactured by performing steps S2 to S4 of the first embodiment on each surface of the base film 2 at the time of manufacturing.

Also in such a light shielding film 11, the same effect as the light shielding film 1 is exhibited. Moreover, since both surfaces of the light shielding film 11 have anti-glare properties, for example, in an optical device in which light passes in the reciprocating direction of the optical path, even when the light shielding film 11 is disposed near the middle of the optical path, Good light-shielding properties and anti-glare properties can be exhibited.

(Third embodiment)
FIG. 5 is a cross-sectional view of the light shielding film 21 according to the third embodiment. As shown in FIG. 5, the light shielding film 21 has antiglare properties on both surfaces (first surface 21 a and second surface 21 b). The light shielding film 21 has the same composition as the light shielding layer 3. The surface shapes of the first surface 21a and the second surface 21b are similar to each other.

The light-shielding film 21 having such a configuration can reduce the thickness dimension while ensuring excellent strength due to the photocurable resin. Accordingly, when the light shielding film 21 is disposed between a plurality of lenses at the time of manufacturing the optical device, the light shielding film 21 has good scratch resistance, so that the yield can be improved and the optical device can be downsized. be able to.

FIG. 6 is a diagram showing a state of manufacturing the light shielding film 21 of FIG. As shown in FIG. 6, at the time of manufacturing the light shielding film 21, the pair of prototypes 4 are arranged with the surfaces 4 a facing each other, and the uncured material 30 is sandwiched between the pair of prototypes 4. Thereby, the deposition step S <b> 2 is performed on both surfaces of the uncured material 30.

Thereafter, the uncured material 30 is irradiated with light from the outside of the pair of prototypes 4 to be cured. Thereby, the curing step S3 is performed on both surfaces of the uncured material 30. Then, the light shielding film 21 is obtained by performing peeling step S4 which peels and removes a pair of original pattern 4.

Here, one of the pair of prototypes 4 can also be used as a support member that supports the uncured material 30 when the light shielding film 21 is manufactured. Specifically, in the deposition step S2, the uncured material 30 is applied to the surface of a support member that is one of the pair of prototypes 4, and the uncured material 30 is supported on the uncured material 30 in a state where the uncured material 30 is supported by the support member. The surface 4a of the prototype 4 which is the other of the pair of prototypes 4 is attached. After the curing step S3, a peeling step S4 for peeling the cured light shielding layer (that is, the light shielding film 21) from the master 4 and the support member is performed. Thereby, the light shielding film 21 is obtained.

According to this method, it is possible to satisfactorily manufacture the light shielding film 21 including the light shielding layer in which the unevenness of the surface 4a of the prototype 4 is transferred to the surface 3a. In addition, since the uncured material 30 can be supported by the support member in the deposition step S2 and the curing step S3, the light shielding film 21 can be efficiently manufactured. Note that the support member may be subjected to a peeling treatment.

(About the prototype)
Hereinafter, the prototype 4 will be described in detail. The surface 4a of the prototype 4 has antiglare properties. As an example, a plurality of sea-island structures are formed on the surface 4a of the prototype 4 by phase separation of a plurality of resin components. The sea-island structure is branched and forms a sea-island structure in a dense state. The prototype 4 exhibits antiglare properties due to a plurality of sea-island structure parts and recesses located between adjacent sea-island structure parts. The surface 4a of the prototype 4 has a network structure, that is, a plurality of irregular loop structures that are continuous or partially missing, by forming the sea-island structure portion in a substantially mesh shape.

Specifically, the surface 4a of the prototype 4 has one or more sea-island structures having a predetermined length per 1 mm ² . In this embodiment, the length dimension of this sea-island structure part is set to a value of 100 μm or more. As a value of the length dimension of the sea-island structure portion, for example, a value of 200 μm or more is more preferable, and a value of 500 μm or more is more preferable. A plurality of sea-island structure portions may exist, but when the entire surface 4a has a sea-island structure, the number of sea-island structure portions on the surface 4a may be one.

In the sea-island structure formed by the sea-island structure part, the meshes having the same diameter are arranged in an irregular shape. The average diameter of the mesh of the sea-island structure (when the mesh of the sea-island structure is an anisotropic shape such as an ellipse or a rectangle) is set to a value in the range of 1 μm to 70 μm, for example. Has been.

As an example, the average diameter value is more preferably in the range of 2 μm to 50 μm, and still more preferably in the range of 5 μm to 30 μm. In another example, the average diameter value is more preferably in the range of 1 μm to 40 μm, more preferably in the range of 3 μm to 35 μm, and still more preferably in the range of 10 μm to 30 μm.

The shape of the sea-island structure portion when the surface 4a is viewed in plan is a string shape having a curved portion at least partly. In this embodiment, the average width of the sea-island structure portion is set to a value in the range of 0.1 μm to 30 μm.

As an example of the value of the average width of the sea-island structure portion, a value in the range of 0.1 μm to 20 μm is more preferable, a value in the range of 0.1 μm to 15 μm is more preferable, and 0.1 μm to 10 μm (especially A value in the range of 0.1 μm or more and 5 μm or less is more preferable.

In another example, the value of the average width of the sea-island structure is more preferably in the range of 1.0 μm to 20 μm, more preferably in the range of 1.0 μm to 15 μm, and more preferably 1.0 μm to 10 μm. Values in the following ranges are more preferred. If the average width is too small, the antiglare property may be lowered.

The average height of the sea-island structure is set to a value in the range of 0.05 μm to 10 μm, for example. As an example, the value of the average height of the sea-island structure is more preferably in the range of 0.07 μm to 5 μm, and more preferably in the range of 0.09 μm to 3 μm (particularly 0.1 μm to 2 μm). preferable.

The occupied area of the sea-island structure portion on the surface 4a is set to a value in the range of 10% to less than 100% of the total surface area of the surface 4a, for example. As an example of the value of the area occupied by the sea-island structure portion on the surface 4a, a value in the range of 30% or more and less than 100% of the total surface area of the surface 4a is more preferable, and 50% or more and less than 100% of the total surface area of the surface 4a ( A value in the range of 70% or more and less than 100% is more preferable. In addition, when the area between sea island structure parts is too small, there exists a possibility that anti-glare property may fall easily.

Here, the size, shape (presence / absence of branching), and area of the sea-island structure portion on the surface 4a can be measured and evaluated based on the two-dimensional shape observed in the micrograph. Moreover, each of the above-described average value, average width, and average height is a value obtained by averaging measured values measured at arbitrary 10 or more positions on the surface 4a.

The surface 4a of the prototype 4 is prevented from forming a lens-like (sea-island-shaped) convex portion due to the formation of a sea-island structure. The shape of the surface 4a of the original pattern 4 is transferred to the surface 3a of the light shielding layer 3 in the first embodiment and its modification and the surfaces 21a and 21b of the light shielding film 21 in the second embodiment.

Note that the plurality of sea-island structures may be independent of each other or may be connected. The phase separation and the sea-island structure of the prototype 4 are formed by performing spinodal decomposition (wet spinodal decomposition) from the liquid phase using a predetermined raw material solution. For details of the surface shape of the prototype 4 and the manufacturing method, the description of Japanese Patent No. 6190581 can be referred to, for example.

Here, the plurality of resin components included in the prototype 4 may be anything that can be phase-separated, but from the viewpoint of obtaining the prototype 4 in which the sea-island structure portion is formed and having high scratch resistance, a polymer and a curable resin are used. It is preferable to include.

As the polymer contained in the prototype 4, a thermoplastic resin can be exemplified. Thermoplastic resins include styrene resins, (meth) acrylic resins, organic acid vinyl ester resins, vinyl ether resins, halogen-containing resins, olefin resins (including alicyclic olefin resins), polycarbonate resins, Polyester resin, polyamide resin, thermoplastic polyurethane resin, polysulfone resin (polyethersulfone, polysulfone, etc.), polyphenylene ether resin (2,6-xylenol polymer, etc.), cellulose derivatives (cellulose esters, cellulose carbamate) , Cellulose ethers, etc.), silicone resins (polydimethylsiloxane, polymethylphenylsiloxane, etc.), rubbers or elastomers (diene rubbers such as polybutadiene, polyisoprene, styrene-butadiene copolymers, acrylo) Tolyl - butadiene copolymer, acrylic rubber, urethane rubber, silicone rubber, etc.) and the like. These thermoplastic resins can be used alone or in combination of two or more.

Examples of the polymer include those having a functional group involved in the curing reaction or a functional group that reacts with the curable compound. This polymer may have a functional group in the main chain or side chain.

Examples of the functional group include a condensable group and a reactive group (for example, a hydroxyl group, an acid anhydride group, a carboxyl group, an amino group or an imino group, an epoxy group, a glycidyl group, an isocyanate group), and a polymerizable group (for example, C2-6 alkenyl groups such as vinyl, propenyl, isopropenyl, butenyl and allyl groups, C2-6 alkynyl groups such as ethynyl, propynyl and butynyl groups, C2-6 alkenylidene groups such as vinylidene groups, or polymerizable groups thereof. Examples thereof include a group having (meth) acryloyl group and the like. Of these functional groups, a polymerizable group is preferable.

The prototype 4 may contain a plurality of types of polymers. Each of these polymers may be phase-separable by spinodal decomposition from the liquid phase, or may be incompatible with each other. The combination of the first polymer and the second polymer included in the plurality of types of polymers is not particularly limited, but those incompatible with each other near the processing temperature can be used.

For example, when the first polymer is a styrene resin (polystyrene, styrene-acrylonitrile copolymer, etc.), examples of the second polymer include cellulose derivatives (eg, cellulose esters such as cellulose acetate propionate), ( (Meth) acrylic resins (polymethyl methacrylate, etc.), alicyclic olefin resins (polymers containing norbornene as a monomer), polycarbonate resins, polyester resins (poly C2-4 alkylene arylate copolyester, etc.) ) Etc.

Further, for example, when the first polymer is a cellulose derivative (for example, cellulose esters such as cellulose acetate propionate), examples of the second polymer include styrene resins (polystyrene, styrene-acrylonitrile copolymer, etc.), Examples thereof include (meth) acrylic resins, alicyclic olefin resins (polymers having norbornene as a monomer), polycarbonate resins, polyester resins (poly C2-4 alkylene arylate copolyesters, and the like).

The plurality of types of polymers may contain at least cellulose esters (for example, cellulose C2-4 alkyl carboxylic acid esters such as cellulose diacetate, cellulose triacetate, cellulose acetate propionate, and cellulose acetate butyrate). .

Here, in the sea-island structure by phase separation of the prototype 4, the precursor of the curable resin contained in a plurality of resin components is cured by active energy rays (such as ultraviolet rays or electron beams) or heat when the prototype 4 is manufactured. It is fixed by doing. Moreover, scratch resistance is imparted to the prototype 4 by such a curable resin.

From the viewpoint of obtaining the scratch resistance of the prototype 4, it is preferable that at least one polymer contained in the plural types of polymers is a polymer having a functional group capable of reacting with the curable resin precursor in the side chain. As the polymer that forms the sea-island structure by phase separation, a thermoplastic resin or other polymer may be included in addition to the two incompatible polymers described above. The weight ratio M1 / M2 between the weight M1 of the first polymer and the weight M2 of the second polymer and the glass transition temperature of the polymer can be set as appropriate.

The curable resin precursor has a functional group that reacts with active energy rays (such as ultraviolet rays or electron beams) or heat, and is cured or crosslinked with this functional group to give a resin (particularly a curable resin or a crosslinked resin). The curable compound to form can be illustrated.

Such compounds include thermosetting compounds or thermosetting resins (epoxy groups, polymerizable groups, isocyanate groups, alkoxysilyl groups, silanol groups, etc., low molecular weight compounds (eg, epoxy resins, unsaturated polyesters). Resins, urethane resins, silicone resins, etc.)), photocurable (ionizing radiation curable) compounds (UV curable compounds such as photocurable monomers and oligomers) that are cured by ultraviolet rays, electron beams, etc. .

Preferred examples of the curable resin precursor include a photocurable compound that is cured in a short time by ultraviolet rays, electron beams, or the like. Of these, UV curable compounds are particularly practical. In order to improve resistance such as scratch resistance, the photocurable compound preferably has 2 or more (preferably about 2 to 15, more preferably about 4 to 10) polymerizable unsaturated bonds in the molecule. Specifically, the photocurable compound is an epoxy (meth) acrylate, urethane (meth) acrylate, polyester (meth) acrylate, silicone (meth) acrylate, or a polyfunctional monomer having at least two polymerizable unsaturated bonds. Preferably there is.

The curable resin precursor may contain a curing agent according to the type. For example, the thermosetting resin precursor may contain a curing agent such as amines and polyvalent carboxylic acids, and the photocurable resin precursor may contain a photopolymerization initiator. Examples of the photopolymerization initiator include conventional components such as acetophenones or propiophenones, benzyls, benzoins, benzophenones, thioxanthones, and acylphosphine oxides.

Further, the curable resin precursor may contain a curing accelerator. For example, the photocurable resin precursor may contain a photocuring accelerator, for example, tertiary amines (dialkylaminobenzoic acid ester and the like), a phosphine photopolymerization accelerator, and the like.

(Prototype according to Modification 1)
FIG. 7 is an enlarged cross-sectional view showing a prototype 14 according to the first modification. The prototype 14 includes a matrix resin 15 and a plurality of fine particles 16 dispersed in the matrix resin 15.

The fine particles 16 are formed in a true spherical shape, but are not limited thereto, and may be formed in a substantially spherical shape or an ellipsoidal shape. The fine particles 16 are solid, but may be formed hollow. When the fine particles 16 are formed in a hollow shape, the hollow portion of the fine particles may be filled with air or other gas. In the matrix resin 15, a plurality of fine particles 16 may be dispersed as primary particles, or a plurality of secondary particles formed by aggregation of the plurality of fine particles 16 may be dispersed.

The fine particles 16 have an average particle size set to a value in the range of 0.1 μm to 10.0 μm. The average particle diameter of the fine particles 16 is more preferably in the range of 1.0 μm to 5.0 μm, and more preferably in the range of 1.0 μm to 4.0 μm.

Further, it is desirable that the variation in the particle size of the fine particles 16 is small. For example, in the particle size distribution of the fine particles contained in the prototype 14, the average particle size of 50% by weight or more of the fine particles contained in the prototype 14 is within 2.0 μm. It is desirable that they are housed in variations.

Thus, uniform and appropriate irregularities are formed on the surface 14a of the prototype 4 by the fine particles 16 having a relatively uniform particle diameter and an average particle diameter set in the above range.

The fine particles 16 dispersed in the matrix resin 15 may be either inorganic or organic, but preferably have good transparency. Examples of the organic fine particles include plastic beads. Plastic beads include styrene beads (refractive index 1.59), melamine beads (refractive index 1.57), acrylic beads (refractive index 1.49), acrylic-styrene beads (refractive index 1.54), polycarbonate beads, Examples thereof include polyethylene beads.

The styrene beads may be crosslinked styrene beads, and the acrylic beads may be crosslinked acrylic beads. The plastic beads preferably have a hydrophobic group on the surface. Examples of such plastic beads include styrene beads.

Examples of the matrix resin 15 include at least one of a photo-curing resin that is cured by active energy rays, a solvent-drying resin that is cured by drying a solvent added during coating, and a thermosetting resin.

Examples of the photocurable resin include those having an acrylate functional group, such as a polyester resin, polyether resin, acrylic resin, epoxy resin, urethane resin, alkyd resin, spiroacetal resin, polybutadiene resin, polythiol polyene having a relatively low molecular weight. Examples include oligomers such as resins and (meth) acrylates of polyfunctional compounds such as polyhydric alcohols, prepolymers, and reactive diluents.

Specific examples thereof include monofunctional monomers such as methyl (meth) acrylate, ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, methylstyrene, N-vinylpyrrolidone, and polyfunctional monomers such as polymethylolpropane trichloride. (Meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexane Examples include diol di (meth) acrylate and neopentyl glycol di (meth) acrylate.

When the photocurable resin is an ultraviolet curable resin, it is preferable to use a photopolymerization initiator. Examples of the photopolymerization initiator include acetophenones, benzophenones, Michler benzoylbenzoate, α-amyloxime ester, tetramethylthiuram monosulfide, and thioxanthones. Moreover, it is also preferable to mix and use a photosensitizer for a photocurable resin. Examples of the photosensitizer include n-butylamine, triethylamine, and poly-n-butylphosphine.

Examples of the solvent-drying resin include known thermoplastic resins. As this thermoplastic resin, styrene resin, (meth) acrylic resin, vinyl acetate resin, vinyl ether resin, halogen-containing resin, alicyclic olefin resin, polycarbonate resin, polyester resin, polyamide resin, Examples include cellulose derivatives, silicone resins, and rubbers or elastomers. As the solvent-drying resin, a resin that is soluble in an organic solvent and excellent in moldability, film forming property, transparency, and weather resistance is particularly desirable. Examples of such solvent-drying resins include styrene resins, (meth) acrylic resins, alicyclic olefin resins, polyester resins, and cellulose derivatives (cellulose esters and the like).

(Prototype according to modification 2)
FIG. 8 is an enlarged cross-sectional view showing a prototype 24 according to the second modification. The prototype 24 has a structure in which an uneven shape is formed on the surface 24a. For example, the prototype 24 is made of a resin 17 similar to the matrix resin 15 of the prototype 14.

The prototype 4 can be obtained, for example, by applying a predetermined uncured material on the surface of a plate material, shaping the surface of the uncured material into a concavo-convex shape with a mold, and then curing the uncured material. The mold may be other than a roll-shaped mold, for example, a plate-shaped mold (embossed plate). Examples of the material of the mold include metal, plastic, and wood.

Unevenness can be formed on the surface of the mold by blasting the surface of the mold with blast particles. As an example of the material of the blast particles, metal, silica, alumina, and glass can be exemplified. The blast particles can be struck against the surface of the mold by, for example, gas or liquid pressure.

The average particle size of the blast particles can be set as appropriate, but can be set to a value in the range of 10 μm to 50 μm as an example. The average particle size of the blast particles is more preferably in the range of 20 μm to 45 μm, and more preferably in the range of 30 μm to 40 μm. In this way, uniform and moderate irregularities are formed on the surface of the mold by the blast particles whose particle sizes are relatively uniform and whose average particle size is set in the above range. Therefore, by shaping using this mold, the master 24 having the concavo-convex shape transferred to the surface 24a is obtained.

(Confirmation test)
A light shielding film 1 shown in FIG. As the base film 2, a film made of PET containing a black pigment was used. 72 parts of a urethane acrylic resin precursor (“Unidec V-4025” manufactured by DIC Corporation), 5 parts of an active compound (“Sunrad SLP-003” manufactured by Sanyo Chemical Co., Ltd.), black fine particles 5 (mixing 20 parts of carbon black dispersion (containing 10% by weight of “MHI Black # 273” manufactured by Mikuni Dye Co., Ltd.) and 3 parts of polymerization initiator (“Irgacure 184” manufactured by BASF Corporation) By doing so, the uncured material 30 of the light shielding layer 3 was prepared.

In addition, as the prototype 4 used for producing Example 1, a prototype film having a sea-island structure including a plurality of resin components and formed by phase separation of the plurality of resin components was used. This prototype film has a film thickness of 50 μm, a surface arithmetic average roughness (Ra) of 1.5, and a gloss of the surface 4a applied to the surface of the uncured material (surface 3a of the light shielding layer 3) at an incident angle of 20 degrees. The glossiness was 0.0%, the glossiness at an incident angle of 60 degrees was 3.0%, and the glossiness at an incident angle of 85 degrees was 20.0%.

Further, a light shielding film 21 shown in FIG. The composition of the light shielding film 21 was the same as that of the light shielding layer 3 of Example 1. In addition, as the prototype 4 used for producing the light shielding film 21 of Example 2, the same one as the prototype film of Example 1 was used.

Further, a light-shielding film 1 similar to that of Example 1 is produced as Example 3 except that the glossiness at incident angles of 60 degrees and 85 degrees and the surface roughness (Ra, Sa, Sq) are different from those of Example 1. did. When producing Example 3, a prototype 4 having a surface shape different from that used in Example 1 was used.

For comparison, light-shielding films of Comparative Examples 1 and 2 having the configurations and physical properties shown in Table 1 were prepared. In the light shielding layer provided in the light shielding films of Comparative Examples 1 and 2, a thermosetting resin is used as the binder resin.

For the light-shielding layer (the light-shielding film itself in Example 2) in each of the light-shielding films of Examples 1 to 3 and Comparative Examples 1 and 2, pencil hardness (pencil hardness based on a measurement method based on JIS K5600), incident angle of 20 degrees, Each glossiness at 60 degrees and 85 degrees (glossiness based on a measurement method based on JlS K7105), optical density, surface roughness (Ra, Sa, Sq) (JIS B 0601 (1994 version) and measurement based on ISO25178) Each surface roughness based on the method) and the surface resistance value (surface resistance value based on the measuring method based on JIS K7194) were measured.

Here, the arithmetic average roughness (Sa) indicates an average of absolute values of height differences of a plurality of points with respect to the average surface. The root mean square height (Sq) corresponds to a parameter of the standard deviation of the distance from the average plane. Table 1 shows the measurement results. In Table 1, “CB” indicates a light shielding layer, “base” indicates a base film, and “black PET” indicates PET containing a black pigment.

As shown in Table 1, in each of Examples 1 to 3, better results were obtained than in Comparative Examples 1 and 2. In particular, the pencil hardness of Examples 1 and 3 was significantly better than the pencil hardness of Comparative Examples 1 and 2 and was found to have high scratch resistance. As a reason why Examples 1 and 3 have high pencil hardness, it is considered that the light shielding layer 3 contains a photocurable resin. The pencil hardness of Example 2 was the same HB as the pencil hardness of Comparative Example 1. However, since the composition of the light shielding film 21 of Example 2 is the same as the composition of the light shielding layer 3 of Example 1, Example 2 is This is considered to have the same scratch resistance as the light shielding layer 3 of Example 1.

In addition, each gloss value at an incident angle of 85 degrees in Examples 1 to 3 is significantly lower than each gloss value at an incident angle of 85 degrees in Comparative Examples 1 and 2 and is 20% or less (this test) Was 9.5% or less).

Further, the light shielding layer 3 of Examples 1 and 3 and the light shielding film 21 of Example 2 do not contain inorganic fine particles or organic fine particles other than the black fine particles 5. For this reason, it turned out that the light-shielding layer 3 of Examples 1 and 3 and the light-shielding film 21 of Example 2 are colored in a favorable black color while being suppressed from being whitish by visual observation.

The values of the surface roughness (Ra, Sa, Sq) of Examples 1 and 2 were both higher than the values of the surface roughness (Ra, Sa, Sq) of Comparative Examples 1 and 2. Moreover, the value of the surface roughness (Ra, Sa, Sq) in Example 3 was almost equal to the value of the surface roughness (Ra, Sa, Sq) in Comparative Examples 1 and 2. From this result, as the prototype 4, by using a prototype film having a sea-island structure that includes a plurality of resin components and is formed by phase separation of a plurality of resin components, the quality of the anti-glare property excellent on the surface of the light-shielding film is stabilized. It was found that it can be granted. Further, it was found that Examples 1 to 3 all had optical densities and surface resistance values equivalent to those of Comparative Examples 1 and 2.

The present invention is not limited to each embodiment, and the configuration and method thereof can be changed, added, or deleted without departing from the spirit of the present invention.

As described above, the present invention has an excellent effect that a light-shielding film can be satisfactorily produced even when a photocurable resin is used as a binder resin for the light-shielding layer in a light-shielding film having a light-shielding layer having antiglare properties on the surface. Therefore, it is beneficial to widely apply the present invention to a light-shielding film that can exhibit the significance of this effect and a method for producing the light-shielding film.

DESCRIPTION OF SYMBOLS 1,11,21 Light-shielding film 2 Base film 3,13 Light- shielding layer 4,14,24 Prototype 5 Black fine particle 6 Binder resin 30 Uncured material

Claims (15)

1. A light shielding film comprising at least one light shielding layer in which black fine particles are dispersed;
   The light shielding layer includes the black fine particles, a photocurable binder resin, and a photoactive compound that activates a polymerization initiator of the precursor of the binder resin by light irradiation, and has irregularities formed on the surface. A light-shielding film in which the surface has anti-glare properties.
2. The light-shielding film according to claim 1, wherein a glossiness at an incident angle of 85 degrees on the surface of the light-shielding layer is set to a value of 20% or less.
3. The content of inorganic fine particles other than the black fine particles or the content of organic fine particles in the light shielding layer is set to a value in the range of 0 wt% or more and 10 wt% or less. Light shielding film.
4. The light-shielding film according to any one of claims 1 to 3, wherein an arithmetic average roughness on the surface of the light-shielding layer is set to a value in a range of 0.03 µm to 3.0 µm.
5. The light-shielding film according to any one of claims 1 to 4, wherein the black fine particles are spherical and have a primary particle size set in a range of 10 nm to 500 nm.
6. 5. The light-shielding film according to claim 1, wherein the black fine particles are carbon nanotubes.
7. The optical density of the light shielding layer in the wavelength range of 380 nm to 780 nm is set to a value of 5.0 or more, and the surface resistance value of the light shielding layer is set to a value of 1 × 10 ¹² Ω / □ or less. The light-shielding film according to any one of claims 1 to 6.
8. The light shielding film according to any one of claims 1 to 7, further comprising a base film disposed on the surface in contact with the light shielding layer.
9. The light-shielding film according to claim 8, wherein a thickness dimension of the base film is set to a value in a range of 1 µm or more and 188 µm or less.
10. A light shielding film comprising at least one light shielding layer in which black fine particles are dispersed;
    The light-shielding layer is a light-shielding film having a pencil hardness set to a value of 2H or higher and an optical density set to a value of 5.0 or higher.
11. An uncured material comprising black fine particles, a precursor of a photocurable binder resin, a polymerization initiator of the precursor of the binder resin, and a photoactive compound that activates the polymerization initiator by light irradiation, A deposition step in which the surface is deposited on the original surface having anti-glare properties by being formed, and
    A curing step of forming a light-shielding layer on the surface of which the shape of the surface of the prototype is transferred by photocuring the uncured material while being applied to the surface of the prototype. Manufacturing method.
12. The method for producing a light-shielding film according to claim 11, wherein a light-transmitting prototype film is used as the prototype in the deposition step.
13. The light-shielding film according to claim 12, wherein in the deposition step, a prototype film having a sea-island structure including a plurality of resin components and formed by phase separation of the plurality of resin components is used as the light-transmissive prototype film. Manufacturing method.
14. In the deposition step, the uncured material is applied to the surface of a support member, and the uncured material is deposited on the surface of the prototype while the uncured material is supported by the support member.
    The method for producing a light-shielding film according to any one of claims 11 to 13, wherein, after the curing step, the light-shielding layer is peeled off from the prototype and the support member.
15. In the deposition step, the uncured material is applied to at least one surface of the base film, and the uncured material is deposited on the surface of the prototype.
    The method for producing a light-shielding film according to any one of claims 11 to 13, wherein the light-shielding layer is peeled off from the original mold after the curing step.

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