Films and sheets having the above-mentioned films, as well as optical devices

Abstract

This invention aims to provide a film that achieves high color purity and vividness of red, and further, in a preferred embodiment, also provides a film with good color purity and vividness of green and blue, and excellent visual recognition. The film is defined as containing a colorant, a red colorant, and a binder. The colorant, when applied at a concentration of 50% by weight on a glass substrate with a thickness of 1 μm using a transparent acrylic resin as a binder, exhibits an average light transmittance of 30% or more at wavelengths from 660 nm to 1000 nm, and an average light transmittance of 20% or less at wavelengths from 380 nm to 660 nm. When the average light transmittance of the film at wavelengths from 400 nm to 660 nm is set as T1 (%), T1 (%) is 25% to 90%, and the film thickness is 0.2 μm to 1000 μm.

Description

Technical Field

[0001] The present invention relates to a film containing a light-shielding colorant suitable for use in a display device (display apparatus). Background Technology

[0002] Patent Document 1 describes an invention that relates to a composition used for a color filter placed in front of a display in which red, green, and blue pixels of an organic EL display element are formed. Patent Document 1 describes a gray photosensitive resin composition comprising one or more of a red, green, and blue pigment and a black pigment such as carbon black, wherein the content of the black pigment is 0.5 to 10% by weight based on the total weight of the solid components of the pigment.

[0003] Furthermore, the invention described in Patent Document 1 has the characteristic that, when a cured film with a thickness of 2.5 μm is formed, the light transmittance in the wavelength range of 580 nm to 620 nm is 20% or more and less than 75%, exhibiting a transmission spectrum with peaks in this wavelength range (see Patent Document 1). Figure 1 It has the characteristic that the light transmittance in the wavelength range of 460nm to 530nm is more than 30% and less than 75%.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 6647238 Specification Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, the cured film formed from the composition of Patent Document 1 has a higher light transmittance in the wavelength range of 580 nm to 620 nm, which is a region of low color purity, compared to the light transmittance in the wavelength range of 640 nm to 660 nm, which is a region of high color purity red wavelengths (refer to Patent Document 1). Figure 1 Therefore, the color vividness of red pixels is greatly reduced.

[0009] Furthermore, while the black pigments such as carbon black contained in the composition of Patent Document 1 have the effect of absorbing external light and reducing the reflection of external light on the film surface, they also absorb all light in the wavelength range of visible and near-infrared light, which includes the aforementioned wavelength range of 640 nm to 660 nm (see reference). Figure 4 Therefore, if the content of the black pigment is too high, all pixels with red, blue and green pixels will darken, resulting in a significant reduction in visual recognition.

[0010] Furthermore, although the cured film formed by the composition of Patent Document 1 has a light transmittance of 30% or more and less than 75% in the wavelength range of 460 nm to 530 nm, it exhibits an almost flat transmission spectrum in the wavelength range of 460 nm to 530 nm because its transmittance is not significantly different from that in the wavelength range of 420 nm to 440 nm (refer to Patent Document 1). Figure 1 Therefore, the color vividness of blue pixels with a wavelength of 460nm and green pixels with a wavelength of 530nm also decreases.

[0011] The present invention was proposed in view of the following problem, which aims to provide a film that can achieve high color purity and color vividness of red, and further, in a preferred embodiment, good color purity and color vividness in the wavelength regions of green and blue, and excellent visual recognition when used in optical devices.

[0012] Furthermore, in order to reduce the influence of external light when used in optical devices, and in a preferred embodiment, to further adjust the hue of the emitted light from the optical device.

[0013] Methods for solving problems

[0014] The gist of the present invention for solving the above-mentioned problems is as follows.

[0015] [1] A film formed from a composition comprising a light-shielding colorant A, a red colorant and a binder, wherein the light-shielding colorant A is a colorant that, when a film is formed on a glass substrate with a thickness of 1 μm at a concentration of 50% by weight using a transparent acrylic resin as a binder, has an average light transmittance of 30% or more at wavelengths of 660 nm to 1000 nm and an average light transmittance of 20% or less at wavelengths of 380 nm or more and less than 660 nm, wherein the average light transmittance of the film at wavelengths of 400 nm to 660 nm is set as T1 (%), and the film thickness is 0.2 μm to 1000 μm.

[0016] [2] The film according to [1] above also contains a second colorant as a colorant that is not equivalent to the above-mentioned opaque colorant A and red pigment, the second colorant being a colorant that has absorption in the visible light region.

[0017] [3] According to the membrane described in [2] above, the second colorant is selected from at least one of yellow colorant and blue colorant.

[0018] [4] The membrane described in [3] above contains both a yellow colorant and a blue colorant as the second colorant.

[0019] [5] In the film according to any one of [1] to [4] above, all or part of the above-mentioned opaque colorant A is a compound selected from azo alkali compounds, perylene compounds, bisbenzofuranone compounds and azo compounds.

[0020] [6] In the film according to any one of [1] to [5] above, when the total amount of colorants contained in the film is set to 100% by weight, the content of the light-shielding colorant A is 15% to 44% by weight.

[0021] [7] The film according to any one of [1] to [6] above further contains a purple colorant.

[0022] [8] According to the membrane described in [7] above, when the total amount of colorants contained in the membrane is set to 100% by weight, the content of the purple colorant is 1% to 10% by weight.

[0023] [9] According to any one of [1] to [8] above, when the average value of the light transmittance of the film at wavelengths of 640nm to 660nm is set as T2 (%) and the average value of the light transmittance at wavelengths of 580nm to 620nm is set as T3 (%), T2-T3 is 3% or more.

[0024]

[10] According to any one of [1] to [9] above, when the average value of the light transmittance of the film at wavelengths of 460nm to 480nm is set as T4 (%) and the average value of the light transmittance at wavelengths of 420nm to 440nm is set as T5 (%), T4-T5 is 3% or more.

[0025]

[11] The color difference of the film according to any one of [1] to

[10] is within 6% when the larger of the absolute value of the difference between the maximum value and the average value of the light transmittance of the film at wavelengths of 460nm, 530nm and 640nm and the absolute value of the difference between the average value and the minimum value is set as the color difference.

[0026]

[12] The membrane according to any one of [1] to

[11] above has adhesive properties.

[0027]

[13] A sheet having a substrate and the film described in any one of [1] to

[12] above.

[0028]

[14] Based on the film described in

[13] above, the chromaticity (a) of reflected or transmitted light was measured using the SCI method when a D65 light source was used as the light source. * b * ) is -10≤a * ≤10 and -10≤b *≤10.

[0029]

[15] Based on the sheet described above

[13] , the chromaticity (a) of reflected or transmitted light was measured using the SCI method when light source A was used as the light source. * b * ) is -10≤a * ≤10 and -10≤b * ≤10.

[0030]

[16] An optical device comprising a light source and a sheet, wherein the sheet is a sheet on which the film described in any one of [1] to

[12] is disposed on a substrate, and the chromaticity (a) of the transmitted or reflected light incident from the light source toward the sheet is measured. * b * ) is -10≤a * ≤10 and -10≤b * ≤10.

[0031] The effects of the invention

[0032] The film of the present invention can provide a red with high color purity and color vividness when used as a material for optical devices. Furthermore, in a preferred embodiment, it can also provide a film with good color purity and color vividness in the wavelength regions of green and blue, and excellent visual recognition.

[0033] Furthermore, it reduces the influence of external light when used in optical devices. In addition, in a preferred embodiment, it is useful to further adjust the hue of the emitted light from the optical device. Attached Figure Description

[0034] Figure 1 This is a cross-sectional view of an example of the membrane of the present invention.

[0035] Figure 2 A cross-sectional view of an example of a sheet on which the film of the present invention is formed on a substrate.

[0036] Figure 3 The transmission spectra of the films prepared in Example 10 and Comparative Example 7 are shown.

[0037] Figure 4 This is an example of a transmission spectrum comparing a film containing only bisbenzofuranone compounds, which are one type of opaque colorant A, as colorants, with a film containing only carbon black pigments that are not equivalent to opaque colorant A.

[0038] Figure 5 Another example of the membrane of the present invention is a cross-sectional view of a membrane composed of multiple layers.

[0039] Figure 6As another example of a sheet on which the film of the present invention is formed on a substrate, (a) is an example of which other layers are formed between the film of the present invention and the substrate, (b) is an example of which other layers are formed on the side of the substrate opposite to the side on which the film of the present invention is formed, and (c) is a cross-sectional view of an example of which other layers are formed on the film of the present invention formed on the substrate.

[0040] Figure 7 This is a cross-sectional view of an example of the film laminated according to the present invention in a display corresponding to a light source and a substrate.

[0041] Figure 8 This is a cross-sectional view of the light path when light is irradiated from the side of the surface on which the film of the present invention is formed, in order to illustrate a sheet in which the film of the present invention is formed on an opaque substrate.

[0042] Figure 9 This is a cross-sectional view of the light path when light is irradiated from a surface opposite to the surface on which the film of the present invention is formed, in order to illustrate a sheet on which the film of the present invention is formed on a transparent substrate.

[0043] Figure 10 This is a cross-sectional view illustrating the optical path when light is irradiated from the side of the laminate containing the reflective film, the film of the present invention, and the transparent substrate, which are sequentially stacked. Detailed Implementation

[0044] This invention relates to a film formed from a composition comprising a light-shielding colorant A, a colorant other than light-shielding colorant A and a colorant having absorption in the visible light region, and a binder. The light-shielding colorant A is a colorant that, when formed on a glass substrate at a concentration of 50% by weight with a transparent acrylic resin as a binder and a film thickness of 1 μm, has an average light transmittance of 30% or more at wavelengths from 660 nm to 1000 nm and an average light transmittance of 20% or less at wavelengths from 380 nm to 660 nm. When the average light transmittance of the film at wavelengths from 400 nm to 660 nm is set as T1 (%), T1 (%) is 25% to 90%, and the thickness of the film is 0.2 μm to 1000 μm.

[0045] Furthermore, it is preferred that the colorant other than the light-shielding colorant A, and the colorant having absorption in the visible light region, is selected from at least one of red, yellow, and blue colorants, and that red colorant is used among them. It should be noted that when using red colorant, colorants other than red colorant can be used in combination, and such colorants are not limited to yellow and blue colorants.

[0046] Furthermore, using red, yellow, and blue colorants together is a preferred approach.

[0047] First, a typical example is a film containing red, yellow, and blue colorants along with opaque colorant A, which is illustrated using figures.

[0048] Figure 1 A cross-sectional view showing an example of the membrane of the present invention. Figure 1 The film shown comprises red colorant 2, yellow colorant 3, blue colorant 4, light-shielding colorant A1, and binder 10. Furthermore, the film of the present invention is a film with a T1 (%) of 25% to 90% when the average light transmittance at wavelengths of 400 to 660 nm is set as T1 (%), and a thickness of 0.2 μm to 1000 μm.

[0049] It should be noted that, here, regarding the light transmittance T1 of the film and T2 to T5 (described later), an Otsuka Electronics Co., Ltd. “LCF-100MA” MCPD9800 spectrometer 3683C was used, with the exposure time set to 30 msec, the number of times accumulated to 4, the sensitivity set to Normal, and the chromaticity set to C light source. Measurements were taken every 1 nm within the range of 380 nm to 780 nm, and the transmittance was determined from the obtained transmittance spectrum.

[0050] It should be noted that when measuring the light transmittance of the film formed on the substrate, after baseline correction using only the substrate as a reference, the light transmittance of the laminate between the substrate and the film of the present invention can be determined. It should also be noted that this applies when multiple materials are used in the substrate or when substances other than the substrate are laminated.

[0051] The light-shielding colorant A used in this invention refers to a material that, when the entire film is 100% by weight and it is contained solely as a colorant, with a colorant content of 50% by weight in the film, has a transmission function with an average light transmittance of 30% or more in the near-infrared wavelength region of 660 nm to 1000 nm and a light-shielding function with an average light transmittance of 20% or less in the visible light region below 660 nm when it is formed on a glass substrate. Specifically, it refers to a substance that, when formed on a glass substrate with a concentration of 50% by weight and a thickness of 1 μm using a transparent acrylic resin as a binder, has an average light transmittance of 30% or more in the wavelength range of 660 nm to 1000 nm and an average light transmittance of 20% or less in the wavelength range of 380 nm or more and below 660 nm. Such a substance is known to be used as a near-infrared filter material. Because the light-shielding colorant A is transmissive in the near-infrared region (660nm–1000nm), it can be said to have different transmission characteristics than carbon black, which is conventionally used as a light-shielding material (see reference). Figure 4 Furthermore, the light-shielding colorant A used in this invention preferably has the property of a sharp increase in transmittance at wavelengths of 660 nm to 720 nm.

[0052] It should be noted that, here, the so-called transparent acrylic resin refers to an acrylic resin or methacrylic resin that has a light transmittance of 99% or more in the entire wavelength region of 300nm to 1000nm when a film with a thickness of 1μm is formed on glass. Examples of such resins include, for instance, a copolymer of benzyl methacrylate / methacrylic acid = 70 / 30 (molar ratio): polystyrene with a converted weight average molecular weight of 30,000.

[0053] The light-shielding colorant A used in this invention is not particularly limited as long as it meets the above definition, and is preferably a compound selected from azo alkali compounds, perylene compounds, bisbenzofuranone compounds and azo compounds.

[0054] Examples of azomethyl base compounds include those described in Japanese Patent Application Publication Nos. 1-170601 and 2-34664, and commercially available examples include "Cromofin Black A1103" manufactured by Dainippon Seika Co., Ltd. Examples of perylene compounds include CI Pigment Black 21, 30, 31, 32, 33, and 34. Examples of bisbenzofuranone compounds include those described in Japanese Patent Application Publication Nos. 2010-534726, 2012-515233, and 2012-515234, and commercially available examples include "Irgaphor Black" manufactured by BASF.

[0055] The film of the present invention utilizes the properties of these light-shielding colorants A to suppress light transmittance in the wavelength range of 580 nm to 620 nm while not suppressing the transmittance of light in the wavelength range of 640 nm to 660 nm, which exhibits high color purity. Therefore, when used in combination with a red colorant, color purity can be improved. Furthermore, when used in combination with a blue colorant, compared to the use of conventional black pigments such as carbon black, the transmittance of light in the wavelength range of 460 nm to 480 nm, which exhibits high color purity, can be selectively suppressed without significantly reducing the transmittance of light in the wavelength range of 420 nm to 440 nm, which exhibits low color purity. In addition, it is also easy to suppress the effects caused by the intrusion of external light, such as the phenomenon of coloration accompanying the entry / exit of external light.

[0056] To maintain the dispersion stability of the colorants, when the total weight of the film is set to 100% by weight, the content of all colorants contained in the film of the present invention is preferably 60% by weight or less, more preferably 50% by weight or less. On the other hand, from the viewpoint of maintaining the color concentration of each colorant, it is preferably 0.01% by weight or more, more preferably 0.04% by weight or more. When the total amount of colorants is set to 100% by weight, the content of the light-shielding colorant A contained in the film of the present invention is preferably 15 to 45% by weight, more preferably 15 to 44% by weight. Here, the total amount of colorants refers to the total amount of all colorants in the film, not only the light-shielding colorant A, but also the red colorant, yellow colorant, blue colorant, etc. By making the content of the light-shielding colorant A 15% by weight or more, the light transmittance in the wavelength range of 580nm to 620nm is suppressed. On the other hand, the transmittance of light in the wavelength range of 640nm to 660nm (high color purity red) is not suppressed, and the transmittance of light in the wavelength range of 420nm to 440nm (low color purity blue) is selectively suppressed without significantly reducing the transmittance of light in the wavelength range of 460nm to 480nm (high color purity blue). Furthermore, the effects caused by the intrusion of external light are also suppressed, which is therefore preferable. Moreover, by making the content of the light-shielding colorant A 44% by weight or less, the average light transmittance of the film in the visible light region is 25% or more, which prevents the image from darkening, and is therefore preferable.

[0057] For the purpose of adjusting hue, the film of the present invention may contain a red colorant and a colorant other than the red colorant that absorbs light in the visible light region (for convenience, such a colorant is sometimes referred to as a "second colorant"). By using such a colorant, the freedom of hue design is increased. When used as an optical device such as a display device as described later, the hue can be determined by considering the spectrum of the light source, the reflection and absorption of light in the substrate such as the base film, and it is easier to achieve colors with high chroma and colors closer to achromatic colors. Such a second colorant can be a dye or a pigment, but from the viewpoint of heat resistance and weather resistance, it is preferred to be a pigment.

[0058] The second colorant can be any color depending on the desired hue. For the film of the present invention, it is advantageous for the second colorant to be at least one colorant selected from yellow and blue colorants in terms of hue adjustment. Furthermore, it is preferred to use both yellow and blue colorants together with a red colorant, as this increases the degree of freedom in hue adjustment. For example, by containing the aforementioned red, yellow, and blue colorants in the film of the present invention, the hue can be easily adjusted by changing their type and amount, thereby reducing color differences between red, green, and blue, or achieving a more neutral color tone.

[0059] Examples of red colorants include CI Pigment Reds 9, 48, 97, 122, 123, 144, 149, 166, 168, 177, 179, 180, 192, 209, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 254, 255, 256, 257, 258, 260, 261, 264, 266, 267, 268, 269, 273, 274, 291, and CI Solvent Reds 45, 49, 125, 130. CI Acid Red 1, 4, 8, 14, 17, 18, 26, 27, 29, 31, 34, 35, 37, 42, 44, 50, 51, 52, 57, 66, 73, 80, 87, 88, 91, 92, 94, 97, 103, 111, 114, 129, 133, 134, 138, 143, 145, 150, 151, 158, 176, 182, 183, 195, 198, 206, 211, 215, 216, 217, 227, 228, 249, 2 52, 257, 258, 260, 261, 266, 268, 270, 274, 277, 280, 281, 308, 312, 315, 316, 339, 341, 345, 346, 349, 382, ​​383, 394, 401, 412, 417, 418, 422, 426, CI direct red 79, 82, 83, 84, 91, 92, 96, 97, 98, 99, 105, 106, 107, 172, 173, 176, 177, 179, 1 81, 182, 184, 204, 207, 211, 213, 218, 220, 221, 222, 232, 233, 234, 241, 243, 246, 250, CI Media Red 1, 2, 3, 4, 9, 11, 12, 14, 17, 18, 19, 22, 23, 24, 25, 26, 30, 32, 33, 36, 37, 38, 39, 41, 43, 45, 46, 48, 53, 56, 63, 71, 74, 85, 86, 88, 90, 94, 95.

[0060] Examples of yellow colorants include CI Pigment Yellow 1, 1:1, 2, 3, 4, 5, 6, 9, 10, 12, 13, 14, 16, 17, 24, 31, 32, 34, 35, 35:1, 36, 36:1, 37, 37:1, 40, 41, 42, 43, 48, 53, 55, 61, 62, 62:1, 63, 65, 73, 74, 75, 81, 83, 87, 93, 94, 95, 97, 100, 101, 104, 105, 108, 109, 110, 111, 116, 117, 119, 120, 126, 127, 127:1, 128, 129. 133, 134, 136, 138, 139, 142, 147, 148, 150, 151, 153, 154, 155, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 172, 173, 174, 175, 176, 180, 181, 182, 183, 184, 185, 188, 189, 190, 191, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 202, 203, 204, 205 206, 207, 211, 213, 218, 220, 221, 228, CI Solvent Yellow 5, 162, CI Acid Yellow 1, 3, 7, 9, 11, 17, 23, 25, 29, 34, 36, 38, 40, 42, 54, 65, 72, 73, 76, 79, 98, 99, 111, 112, 113, 114, 116, 119, 123, 128, 134, 135, 138, 139, 140, 144, 150, 155, 157, 160, 161, 163, 168, 169, 172, 177, 178, 179, 184, 190, 193 196, 197, 199, 202, 203, 204, 205, 207, 212, 214, 220, 221, 228, 230, 232, 235, 238, 240, 242, 243, 251, CI direct yellow 2, 33, 34, 35, 38, 39, 43, 47, 50, 54, 58, 68, 69, 70, 71, 86, 93, 94, 95, 98, 102, 108, 109, 129, 136, 138, 141, CI medium yellow 5, 8, 10, 16, 20, 26, 30, 31, 33, 42, 43, 45, 56, 61, 62, 63.

[0061] Examples of blue colorants include CI Pigment Blue 1, 1:2, 9, 14, 15, 15:1, 15:2, 15:3, 15:4, 15:5, 15:6, 16, 17, 19, 25, 27, 28, 29, 33, 35, 36, 56, 56:1, 60, 61, 61:1, 62, 63, 64, 66, 67, 68, 71, 72, 73, 74, 75, 76, 78, 79, and CI Solvent Blue 5, 25, 35, 38, 44, 45, 64, 67, 70. 122, 129, CI Acid Blue 7, 23, 25, 27, 35, 40, 41, 43, 45, 47, 49, 51, 53, 55, 56, 62, 68, 69, 78, 80, 81:1, 90, 104, 111, 112, 124, 127, 127:1, 138, 140, 150, 175, 215, 230, 244, 277, 344, CI Direct Blue 86, 87, 199, CI Reactive Blue 25, CI Mediat Blue 1, 3, 17, 29.

[0062] Furthermore, the membrane of the present invention preferably contains a purple colorant as a second colorant. Because the membrane of the present invention contains a light-shielding colorant A, the transmittance of visible light wavelengths is suppressed. Furthermore, because the membrane of the present invention contains a purple colorant, compared to the case without a purple colorant, the transmittance of blue light with wavelengths of 460nm to 480nm and the transmittance of red light with wavelengths of 640nm to 660nm, exhibiting high color purity, are relatively higher when the colorant concentration in the membrane solid component is the same. As a result, color purity can be selectively improved.

[0063] Examples of purple colorants include CI Pigment Violet 14, 19, 23, 29, 30, 32, 33, 36, 37, 40, 50; CI Solvent Violet 2, 8, 9, 11, 13, 14; CI Acid Violet 6B, 7, 9, 17, 19; CI Direct Violet 47, 52, 54, 59, 60, 65, 66, 79, 80, 81, 82, 84, 89, 90, 93, 95, 96, 103, 104; and CI Mordant Violet 1, 2, 4, 5, 7, 14, 22, 24, 30, 31, 32, 37, 40, 41, 44, 45, 47, 48, 53, 58.

[0064] The content of the purple colorant contained in the film of the present invention is not particularly limited. When the total amount of colorant is set to 100% by weight, the content of purple colorant is preferably 1% to 10% by weight. By having a purple colorant content of 1% by weight or more, the transmittance of light with wavelengths of 640 nm to 660 nm is not reduced. Furthermore, by having a purple colorant content of 10% by weight or less, the reduction in transmittance of light with wavelengths around 460 nm can be suppressed.

[0065] Furthermore, examples of second colorants other than yellow and blue colorants that can be used in this invention include CI Pigment Green 7, 36, 58, 59, 62, 63; CI Solvent Green 1, 3, 4, 5, 7, 28, 29, 32, 33, 34, 35; CI Acid Green 1, 3, 5, 6, 7, 8, 9, 11, 13, 14, 15, 16, 22, 25, 27, 28, 41, 50, 50:1, 58, 63, 65, 80, 104, 105, 106, 10 9. CI Direct Green 25, 27, 31, 32, 34, 37, 63, 65, 66, 67, 68, 69, 72, 77, 79, 82; CI Medium Green 1, 3, 4, 5, 10, 13, 15, 19, 21, 23, 26, 29, 31, 33, 34, 35, 41, 43, 53, etc.; CI Pigment Orange 13, 36, 38, 43, 51, 55, 59, 61, 64, 65, 71, etc.; CI Pigment Brown 28, etc., etc., brown colorants.

[0066] The film of the present invention contains an adhesive that retains the aforementioned colorant and other components. It should be noted that the adhesive used in the film of the present invention does not need to be a transparent acrylic resin. The material used as the adhesive is not particularly limited; in addition to adhesive resins composed of natural resins and synthetic resins, ceramics such as alumina can also be used. Examples of adhesive resins include, for example, acrylic resins, epoxy resins, polyimide resins, urethane resins, urea resins, vinyl resins, melamine resins, polyamide resins, polyester resins, olefin resins, and cellulose resins. Two or more of these resins may be included. If the adhesive is opaque, it may sometimes affect the light transmission and reflection properties of the film of the present invention; therefore, a transparent material is preferred. Furthermore, if the adhesive itself is colored, it may sometimes affect the color tone; therefore, a colorless material is preferred. That is, a colorless and transparent material is preferred.

[0067] Furthermore, from the viewpoint of operability during preparation and the softness of the resulting membrane, the membrane of the present invention preferably uses a resin-based binder, and from the viewpoint of dispersibility and stability over time, an acrylic resin is preferred. Examples of acrylic resins include polymers of unsaturated carboxylic acids and copolymers of unsaturated carboxylic acids with other olefinically unsaturated compounds. Among these, copolymers of unsaturated carboxylic acids with olefinically unsaturated compounds are preferred. Examples of unsaturated carboxylic acids include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, and vinylacetic acid.

[0068] Examples of olefinically unsaturated compounds include, for instance, alkyl esters of unsaturated carboxylic acids such as methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, and benzyl methacrylate; aromatic vinyl compounds such as styrene and methylstyrene; aminoalkyl esters of unsaturated carboxylic acids such as aminoethyl acrylate; glycidyl acrylate and glycidyl methacrylate; vinyl esters of carboxylic acids such as vinyl acetate and vinyl propionate; cyanide vinyl compounds such as acrylonitrile, methacrylonitrile, and α-chloroacrylonitrile; aliphatic conjugated dienes such as 1,3-butadiene and isoprene; and macromonomers such as polystyrene, polymethyl acrylate, polymethyl methacrylate, polybutyl acrylate, polybutyl methacrylate, and polysilicon, which have acryloyl or methacryloyl groups at the ends.

[0069] Acrylic resins are preferably those with olefinic unsaturated groups on their side chains, which can improve the sensitivity of the resin when it is photosensitive. Examples of olefinic unsaturated groups include vinyl, allyl, acryloyl, and methacryloyl groups. Methods for introducing olefinic unsaturated groups into the side chains of acrylic resins include methods such as adding olefinic unsaturated compounds with epoxy groups, acryloyl chloride, methacryloyl chloride, etc., to the acrylic resin when it has carboxyl or hydroxyl groups, or adding compounds with olefinic unsaturated groups using isocyanates.

[0070] Examples of acrylic resins having olefinic unsaturated groups in the side chain include, for example, Diesel Ornex Co., Ltd., Cyclomar (registered trademark) P(ACA)Z250 (45% by weight solution of dipropylene glycol monomethyl ether), ADEKA Co., Ltd., Adekara Kurtz WR301 (45% by weight solution of dipropylene glycol monomethyl ether), KRX-3802 (45% by weight solution of dipropylene glycol monomethyl ether), and alkali-soluble cardo resins.

[0071] From the viewpoint of improving membrane strength, when the binder is a resin, the weight-average molecular weight (Mw) of the resin is preferably 3,000 or more, more preferably 5,000 or more. On the other hand, from the viewpoint of improving membrane stability, it is preferably 200,000 or less, more preferably 100,000 or less. It should be noted that the weight-average molecular weight is obtained by gel permeation chromatography and is converted from a standard polystyrene value.

[0072] From the viewpoint of maintaining the mechanical strength of the film, when the total weight of the film is set to 100% by weight, the content of the adhesive in the film of the present invention is preferably 0.5% by weight or more, more preferably 1% by weight or more. On the other hand, from the viewpoint of maintaining the color concentration of each colorant, when the total weight of the film is set to 100% by weight, it is preferably 99.99% by weight or less, more preferably 99.96% by weight or less.

[0073] In the composition used to obtain the film of the present invention, components other than the opaque colorant A, the red colorant, the binder, and the second colorant may include a adhesion modifier, a surfactant, a dispersant, a reactive monomer, a photopolymerization initiator, a chain transfer agent, a sensitizer, a polymerization inhibitor, etc., and more than two of these may be included. Examples of adhesion modifiers include, for example, silane coupling agents such as 3-methacryloyloxypropyltrimethoxysilane. When the total amount of the binder is set to 100% by weight, the content of the adhesion modifier is preferably 0.001% by weight or more and 10% by weight or less.

[0074] Examples of surfactants include anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, fluorinated surfactants, and silicone surfactants. By including a surfactant, the surface smoothness of the resulting membrane can be improved. When the total content of the membrane is set to 100% by weight, the surfactant content is preferably 0.01% by weight or more and 10% by weight or less.

[0075] As a dispersant, a substance preferably possessing a colorant-affinity site with the property of adsorbing the colorant and a site compatible with the substance carrying the colorant in the membrane, thereby stabilizing the dispersion of the colorant carrier by adsorbing it onto the colorant. Examples of such commercially available dispersants include DisperBYK manufactured by Bickkemi-Japan, SOLSPERSE manufactured by Nippon Lubrizol, EFKA and Efka manufactured by BASF, and Ajispear manufactured by Ajinomoto Film Technology Co., Ltd. When the total weight of the obtained membrane is set to 100% by weight, the content of the dispersant is preferably 0.01% by weight or more and 10% by weight or less.

[0076] Furthermore, the composition (precursor composition) used to obtain the membrane of the present invention may also contain compounds such as reactive monomers and photopolymerization initiators that are polymers obtained as adhesives by light irradiation, and the precursor composition may further contain chain transfer agents, sensitizers, and chain transfer agents.

[0077] Examples of reactive monomers include, for instance, bisphenol A diglycidyl ether (meth)acrylate, poly(meth)acrylate urethane, alkyd-modified (meth)acrylate oligomers, tripropylene glycol di(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol penta(meth)acrylate, or their alkyl-modified, alkyl ether-modified, or alkyl ester-modified derivatives. From the viewpoint of compatibility with the adhesive, the molecular weight of the reactive monomer is preferably 400 or more. When the total amount of the adhesive is set to 100% by weight, the content of the reactive monomer in the composition used to obtain the film of the present invention is preferably 10% by weight or more and 80% by weight or less.

[0078] Examples of photopolymerization initiators include benzophenone compounds, alkyl benzophenone compounds, anthraquinone compounds, imidazole compounds, benzothiazole compounds, and benzo[…]. Zazole compounds, oxime compounds, triazine compounds, phosphorus compounds, titanates, etc. When the total amount of the adhesive is set to 100% by weight, the content of the photopolymerization initiator in the precursor composition is preferably 0.1% by weight or more, and preferably 10% by weight or less.

[0079] Examples of chain transfer agents include thioglycolic acid, thiomalic acid, thiosalicylic acid, 2-mercaptopropionic acid, 3-mercaptopropionic acid, 3-mercaptobutyric acid, thioglycolic acid, trimethylolpropanetriol, pentaerythritol tetra, 1,4-bis(3-mercaptobutyryloxy)butane, disulfide compounds obtained by oxidizing these thioglycolic compounds, iodoalkyl compounds such as iodoacetic acid and iodopropionic acid, etc. When the total amount of the adhesive is set to 100% by weight, the content of the chain transfer agent in the precursor composition is preferably 0.01% by weight or more and 10% by weight or less.

[0080] Examples of sensitizers include thioxanthone-based sensitizers and aromatic or aliphatic tertiary amines. When the total amount of the adhesive is set to 100% by weight, the content of the sensitizer in the precursor composition is preferably 0.01% by weight or more and 5% by weight or less. Examples of polymerization inhibitors include hydroquinone, tert-butylhydroquinone, 2,5-bis(1,1,3,3-tetramethylbutyl)hydroquinone, catechol, and tert-butylcatechol. When the total amount of the adhesive is set to 100% by weight, the content of the polymerization inhibitor in the precursor composition is preferably 0.001% by weight or more and 5% by weight or less.

[0081] The film of the present invention is characterized by a T1 (%) of 25% to 90% when the average light transmittance at wavelengths of 400 nm to 660 nm is set as T1 (%). The light-shielding colorant A used in the present invention is sometimes used in near-infrared filters. In the case of near-infrared filters, the design is essentially to have light transmittance in the visible light region close to zero. There is no idea of ​​using it in combination with other colorants, especially red colorants, to improve color purity. Furthermore, there is no idea of ​​using the film of the present invention as a component of pixels in a display that is not easily affected by external light and also has the function of adjusting color tone.

[0082] Specifically, by having a T1 (%) of 25% or more, the minimum amount of visible light required for pixel display can be transmitted, preventing the screen from darkening. Furthermore, by having a T1 (%) of 90% or less, the influence of external light that obstructs pixel display can be minimized, preventing the screen from becoming difficult to see due to external light. Moreover, since brightening the screen improves visual clarity and further prevents adverse effects from external light, a T1 (%) of 35% to 80% is preferred.

[0083] It should be noted that even with conventional compositions containing a high proportion of opaque colorant A, if the thickness of the resulting film is extremely thin, it is theoretically possible to achieve a T1 (%) of 25% or more, but other problems arise in this case. The present invention also has the following technical significance: it allows for film thicknesses of 0.2 μm to 1000 μm without causing such problems.

[0084] That is, by making the film thickness 0.2 μm or more, the generation of defects such as pinholes during film formation can be reduced. Furthermore, by making the film thickness 1000 μm or less, even if the content of colorant other than the light-shielding colorant A is extremely small, i.e., even if the concentration is low, deviations in the content ratio during film formation, i.e., concentration unevenness, can be minimized, making it easier to adjust T1 (%) to the aforementioned range and adjust the color balance. Further, in order to improve the mechanical strength of the film and facilitate color balance adjustment, the film thickness of the present invention is preferably 0.4 μm to 200 μm.

[0085] Furthermore, the film of the present invention preferably has a T2-T3 ratio of 3% or more when the average light transmittance at wavelengths of 640 nm to 660 nm is set as T2 (%) and the average light transmittance at wavelengths of 580 nm to 620 nm is set as T3 (%). With a T2-T3 ratio of 3% or more, the film of the present invention can significantly improve the color sharpness of red pixels. Further, to improve the color sharpness of red pixels, a T2-T3 ratio of 5% or more is more preferable for the film of the present invention. Moreover, a higher T2-T3 ratio is more preferred. If we use bisbenzofuranone as an example of a light-shielding colorant A for illustration, it is determined that the spectral tilt of the film near this wavelength (580 nm to 660 nm) increases in response to the increasingly higher tilt of the spectrum located on the longer wavelength side compared to it (see reference). Figure 4 If we follow such an example, the upper limit of T2-T3 is preferably 45% based on the difference in light transmittance up to 660nm-710nm (light transmittance at 710nm - light transmittance at 660nm) that can substantially maximize the upward tilt of the spectrum of the opaque colorant A.

[0086] Furthermore, the film of the present invention preferably has a T4-T5 ratio of 3% or higher when the average light transmittance at wavelengths of 460 nm to 480 nm is set as T4 (%) and the average light transmittance at wavelengths of 420 nm to 440 nm is set as T5 (%). With a T4-T5 ratio of 3% or higher, the film of the present invention can improve the color sharpness of blue pixels. Further, to improve the color sharpness of blue pixels, a T4-T5 ratio of 5% or higher is more preferable. Moreover, a higher T4-T5 ratio is more preferred. However, as a practical upper limit, if we use bisbenzofuranone as an example of a light-shielding colorant A, it can be seen that the upper limit increases due to the increasing upward tilt of the spectrum near that wavelength (420 nm to 480 nm). If we follow such an example, the upper limit of T4-T5 is preferably 20% based on the difference in light transmittance (light transmittance at 480nm - light transmittance at 420nm) up to the maximum angle of the spectrum of the opaque colorant A.

[0087] Furthermore, the film of the present invention preferably has a color difference of 6% or less when the larger of the absolute value of the difference between the maximum and average values ​​of the light transmittance at wavelengths of 460nm, 530nm, and 640nm, and the absolute value of the difference between the minimum and average values ​​of the light transmittance at the three wavelengths, is taken as the color difference. With this color difference of 6% or less, for example, when using white light obtained from monochromatic light sources of red, green, and blue, the wavelengths of pure red, green, and blue light required for image display can be transmitted equally, color balance control of red, green, and blue pixels is easier to perform, and the reduction in color purity of each color can be suppressed.

[0088] Furthermore, to facilitate the control of pixel color balance and improve the color purity of each color of light, a color difference of 4% or less is preferred. The smaller the color difference, the more the luminous intensity of each monochromatic light source (red, blue, and green) can be adjusted to the same level. As a result, the undesirable color balance caused by the different luminous intensities of each monochromatic light source is eliminated, and the color purity of each transmitted color can be improved.

[0089] Furthermore, the film of the present invention preferably has adhesive properties. Here, adhesiveness refers to the property of adhesion. In the present invention, when the peel adhesion was evaluated according to the method of JIS Z 0237:2022 (sample width: 20 mm, lining material: 25 μm thick PET film; pressure conditions: 2 kg roller reciprocating; curing conditions: 23°C / 50% RH × 1 hour; test speed: 300 mm / min; test conditions: 23°C / 50% RH; peel angle: 180 degrees), a peel strength of 100 gf or higher is considered adhesive.

[0090] By having adhesive properties, it can be easily adhered to surfaces such as displays. As a method for imparting adhesiveness to the film of the present invention, examples include adding various adhesives such as rubber-based, acrylic-based, and silicone-based adhesives at a content of 0.01% to 20% by weight, when the total weight of the film is set to 100% by weight, or making the adhesive a material with adhesive properties.

[0091] As an adhesive, assuming that the adhesive will not peel off after the film is pasted onto the surface of a display or similar object, an acrylic adhesive with a high degree of crosslinking and permanent bonding is preferred. Examples of adhesives with adhesive properties include, for instance, light-curing urethane resins, which are preferably cured by irradiation with ultraviolet light or the like after being pasted onto the surface of a display or similar object, thus ensuring a strong bond.

[0092] The film of the present invention can be a single-layer film or a multi-layer laminated film. In the case of a multi-layer laminated film, the colorant contained therein can be included in other layers. Examples include a first layer containing only a light-shielding colorant A, a second layer containing a yellow colorant and a blue colorant, a third layer containing only a red colorant, and a fourth layer containing a purple colorant and an infrared-transmitting colorant (see [reference]). Figure 5 It should be noted that, in the case where the film of the present invention is a multilayer laminated film, the content of each colorant shown above is determined by the total amount of each colorant contained in the laminated film. Furthermore, the content ratio of each colorant is determined by setting the total amount of colorants contained in the laminated film to 100% by weight and the ratio of each colorant to its content.

[0093] Furthermore, the membrane of the present invention can be used alone, but as a sheet of the present invention, it can be formed on other substrates for use. For example, Figure 2 The solution shown is to form the film of the present invention on the substrate 50 to become the sheet 110 of the present invention. In particular, when the thickness of the film of the present invention is 50 μm or less, operation becomes difficult due to insufficient rigidity of the individual film. Therefore, the lack of rigidity of the film is compensated by using a substrate.

[0094] The substrate used in the sheet of the present invention can be either transparent or opaque. When using an opaque substrate, it can be a substrate that can be peeled off later. As a transparent substrate, examples include a substrate with a total light transmittance of 80% or more when measured by the method specified in JIS K7375:2008.

[0095] When it is difficult to measure the light transmittance T1 to T5 (%) of the film of the present invention when the substrate 50 is opaque and the substrate is laminated, a transparent substrate can be prepared separately, and the film of the present invention can be formed by transferring the composition onto it and the measurement can be performed using the transferred sheet, or the film of the same composition can be copied onto a separately prepared transparent substrate and the light transmittance T1 to T5 (%) can be measured.

[0096] There are no particular restrictions on the material of the aforementioned substrate. In addition to plastic film, it can also be paper, metal plate, ceramic sheet, etc. Furthermore, it can also be a substrate in which these materials are laminated.

[0097] When using plastic film as the substrate material, examples include resin films made of polyester, polyvinyl chloride, polypropylene, polyethylene, acrylic, urethane, polycarbonate, polyamide, polystyrene, acrylonitrile butadiene styrene copolymer, polyvinyl alcohol, cycloolefins, polyimide, etc.

[0098] When using paper as the substrate, in addition to cellulose raw materials, synthetic paper can also be used. When using metal plates as the substrate, examples include iron plates, copper plates, aluminum foil, and nickel foil. When using ceramic sheets as the substrate, examples include soda glass sheets, alkali-free glass sheets, alumina sheets, zirconium oxide sheets, aluminum nitride sheets, and silicon nitride sheets.

[0099] The thickness of the substrate is not particularly limited, but it is preferably 10 μm or more and 2 mm or less, considering moderate rigidity and flexural strength as well as ease of handling. It should be noted that other layers 60 (see reference 60) can be formed between the film and the substrate of the present invention. Figure 6 (a)) Alternatively, other layers 60 may be formed on the side of the substrate 50 opposite to the side on which the film 100 of the present invention is disposed (see reference). Figure 6 (b)). Furthermore, other layers 60 may also be formed as layers covering the film of the present invention formed on the substrate 50 (see [reference]). Figure 6 (c)).

[0100] Other examples of the aforementioned layers include, for instance, a water vapor barrier layer to prevent the display from deteriorating due to moisture, an anti-reflective layer to prevent reflection of external light, an adhesive layer to improve interlayer adhesion, an ultraviolet blocking layer to prevent the colorant contained in the film of the present invention from deteriorating due to ultraviolet light, and a hard coating layer to prevent scratches on the film of the present invention.

[0101] Next, the method for forming the film according to the present invention will be described. The method for forming the film according to the present invention is not particularly limited. For example, in the case of forming a film with a thickness of tens of μm or less, a method can be described as preparing a composition in a liquid state containing a solvent, coating the composition onto a substrate to form a coating film, and then drying it to allow the solvent to disperse.

[0102] By including a solvent in the composition, viscosity characteristics suitable for coating onto a substrate can be obtained. Examples of solvents include acetate-based solvents, alkylene glycol ether-based solvents, aliphatic ester-based solvents, aliphatic alcohol-based solvents, ketone-based solvents, and hydrocarbon-based solvents. Specifically, examples include ethyl acetate, 3-methyl-2-butanol, butanol, propylene glycol monomethyl ether, butyl acetate, propylene glycol monoethyl ether, isoamyl acetate, xylene, propylene glycol monomethyl ether acetate, and amyl acetate.

[0103] Alternatively, a reactive diluent can be used instead of the solvent to prepare the composition, and the composition can be coated onto a substrate to form the film of the present invention. Examples of reactive diluents include short-chain aliphatic alcohols, polymeric alkyl glycidyl ethers, and acrylates. Specifically, examples include alkyl monoglycidyl ethers, alkyl diglycidyl ethers, alkylphenol monoglycidyl ethers, and 2-(2-ethoxyethoxy)ethyl acrylate.

[0104] Methods for coating the composition onto a substrate include general printing methods such as gravure, offset printing, and screen printing, as well as methods such as die coating, slot coating, slot die coating, gravure coating, reverse coating, dipping, inkjet printing, and jet coating. Methods for drying the composition include ovens and hot plates. In particular, vacuum drying is preferred to improve drying efficiency.

[0105] As a method for preparing a composition for obtaining the film of the present invention, examples include, for instance, adding a light-shielding colorant A, a second colorant used as needed, wherein at least one colorant is selected in particular from red, yellow and blue colorants, and dispersing the pigment dispersion by a disperser with a binder and a solvent or reactive diluent, and then adding other colorants and other components as needed for mixing.

[0106] When a dispersant is included as another component, it can be added during the preparation of the pigment dispersion and then stirred and mixed using a disperser. Examples of dispersers include sand mills, ball mills, bead mills, three-roll mills, and ultrafine grinding mills. Among these, bead mills, which offer excellent dispersion efficiency, are preferred.

[0107] Furthermore, when the thickness of the film of the present invention is tens of μm or more and has sufficient rigidity, for example, a thermoplastic resin can be selected as the adhesive, and when the total weight of the film is set to 100% by weight, the content of the adhesive is set to 80% by weight or more, the composition is heated to a fluid state, and formed without a substrate by extrusion molding, calendering molding or the like using a T-die.

[0108] The film of the present invention is disposed on the surface of various displays 70 such as organic EL, liquid crystal, micro LED, plasma, CRT, and laser (see reference). Figure 7 This makes the colors of the display 70 more vibrant, improves durability, and reduces the impact of external light. However, even a small number of uses are not limited to those intended to achieve the effects / functions of the invention. Figure 7 The usage scheme shown can be applied to all products other than those with this composition.

[0109] For example, the film of the present invention can also be applied to the screen film of a short-throw projector. If used Figure 8 To illustrate this usage, the sheet 110 on which the film 100 of the present invention is formed on the opaque substrate 51 serves as a screen film. A light source 120 disposed on the film 100 side of the present invention irradiates the sheet 110 with laser light or similar rays. The irradiated light is transmitted from the film 100 of the present invention, reflected at the interface with the opaque substrate 51, and then transmitted again from the film 100 of the present invention as reflected light 130, reaching the viewer's side, thereby enabling image display.

[0110] The opaque substrate 51 used as the screen film for a short-throw projector is preferably a substrate with high light reflectivity, in which metal powders such as aluminum, chromium, and nickel, bright pigments, and highly reflective coloring pigments such as titanium dioxide are dispersed. When the film 100 is thick and has a rigid function as a substrate, a thin metal vapor-deposited film such as aluminum can be formed on the film 100 to form a sheet 110.

[0111] At this time, the hue of the opaque substrate 51 is often colored because it is not achromatic. Therefore, it is preferable to appropriately adjust the type or amount of colorant contained in the film 100 of the present invention, and other components as needed, according to the hue of the opaque substrate 51, so that when white light is incident from the light source, the hue of the reflected light 130 becomes achromatic (i.e., white or gray). That is, in the optical device of the present invention that utilizes reflected light, it is desirable to have a light source and a sheet on which the film of the present invention is disposed, and the chromaticity (a) of the reflected light incident from the light source onto the sheet is... * b * ) is -10≤a * ≤10 and -10≤b * ≤10.

[0112] It should be noted that here, the reflectance chromaticity and transmittance chromaticity of the film (a) are... * b * Using a spectrophotometer "CM3700d" manufactured by Conicaminodesk Ltd., with a field of view of 2° and CIE L * a * b* The colorimetric system model is used to determine the colorimetric value. When evaluating reflectance colorimetry, the SCI method, which includes positively reflected light, is preferred.

[0113] Furthermore, when D65 and C light sources are frequently used as light sources for optical devices, it is desirable to utilize the reflected light in a sheet of the present invention with the film of the present invention disposed on a substrate, and to measure the chromaticity (a) of the reflected light using the SCI method when using a spectrophotometer with a D65 light source as the light source. * b * ) is -10≤a * ≤10 and -10≤b * ≤10. Furthermore, it is desirable to measure the chromaticity (a) of reflected light using the SCI method when a spectrophotometer is used with an A light source as the light source, for a sheet on a substrate to which the film of the present invention is disposed. * b * It is also -10≤a * ≤10 and -10≤b * ≤10 pieces.

[0114] Furthermore, the film of this invention can also be applied to optical devices that utilize transmitted light, such as organic EL, liquid crystal, and micro LED. If used... Figure 9 To illustrate this usage, the sheet 110 on which the film 100 of the present invention is formed on the transparent substrate 52 functions as a filter, allowing light from the light source 120 disposed on the transparent substrate 52 side to be incident on the transparent substrate 52. The incident light, as transmitted light 140 transmitted from the transparent substrate 52 and the film 100 of the present invention, reaches the viewer side, thereby enabling image display.

[0115] At this time, the hue of the transparent substrate 52 is sometimes not achromatic but exhibits some coloration. In such cases, it is preferable to appropriately adjust the type or amount of colorant contained in the film 100 of the present invention, and other components as needed, according to the hue of the transparent substrate 52, so that when white light is incident from the light source, the hue of the transmitted light 140 becomes achromatic (i.e., white or gray). That is, in the optical device of the present invention utilizing transmitted light, it is desirable to have a light source and a sheet on which the film of the present invention is disposed, and the chromaticity (a) of the transmitted light incident from the light source onto the sheet is... * b * ) is -10≤a * ≤10 and -10≤b * ≤10. It should be noted that the evaluation of transmitted colorimetry includes the measurement of scattered transmitted light.

[0116] Furthermore, when D65 and C light sources are frequently used as light sources for optical devices, it is desirable to utilize the transmitted light in a way that allows for the application of the present invention's film on a substrate. The chromaticity (a) of the transmitted light was measured using a spectrophotometer when using a D65 light source as the light source. * b * ) is -10≤a * ≤10 and -10≤b * ≤10. Furthermore, it is desirable for a sheet on which the film of the present invention is disposed on a substrate, and for the colorimetry of the transmitted light measured using a spectrophotometer when using light source A as the light source (a). * b * It is also -10≤a * ≤10 and -10≤b * ≤10 pieces.

[0117] Furthermore, in the optical device of the present invention, it is preferable that, assuming the spectrum of the light source is not achromatic (white), when such a light source is used, the type or amount of colorant contained in the film of the present invention, and other components as needed, are appropriately adjusted according to the spectrum of the light source to adjust the chromaticity (a) of the reflected light when using reflected light. * b * ), using transmitted light, the chromaticity of transmitted light (a) * b * ) is -10≤a * ≤10 and -10≤b * ≤10. In this case, if the hue of the opaque or transparent substrate is not achromatic, the determination of the hue of the film of the present invention is made with further consideration of the description of the situation mentioned above.

[0118] The design of the film of the present invention in the optical device of the present invention will be specifically illustrated by an example. First, the chromaticity of the light source used in the actual optical device is calculated, that is, the chromaticity of the light source (Δa). * 01 Δb * 01 The aforementioned chromaticity is the difference between the chromaticity of the standard plate surface when illuminated by the actual optical device's light source and the chromaticity of the standard plate surface when illuminated by a standard light source. That is, it is the difference Δa between the chromaticity of the standard plate surface when illuminated by the actual optical device's light source and the chromaticity of the standard plate surface when illuminated by a standard light source. * 01 When it becomes positive, it approaches red; when it becomes negative, it approaches green; at Δb * 01When positive, it approaches yellow; when negative, it approaches blue. The standard light source is set to D65. A standard film is a film whose reflected light, measured from the surface of the film when illuminated by the selected standard light source, is colorless (white). Light is shone onto the standard film from both the standard light source and the light source used in the actual optical device, and the chromaticity of the reflected light from the surface of the standard film is measured using a spectrophotometer in the SCI method.

[0119] Next, the chromaticity of the substrate used in the actual optical device is calculated, i.e., the substrate chromaticity. Here, "substrate" refers to a component in the optical device being considered, excluding the film of this invention, located within the optical path of light from the light source, or a light-reflecting component (in the case of a reflective plate in a reflective optical device). The chromaticity of the reflected light from the substrate surface when light is irradiated from the aforementioned standard light source onto the aforementioned substrate, using the SCI method, is calculated, i.e., the substrate reflectance chromaticity (α). * 11 b * 11 ), or the chromaticity of the transmitted light transmitted from the substrate, i.e., the substrate transmittance chromaticity (a * 12 b * 12 The aforementioned substrate reflectance chromaticity refers to the difference between the chromaticity of the substrate surface when a standard light source is irradiated from the substrate side, and the chromaticity of the standard sheet surface when irradiated with the standard light source. Specifically, it is the difference Δa between the chromaticity of the substrate surface when irradiated with the standard light source and the chromaticity of the standard sheet surface when irradiated with the standard light source, where the actual optical device is placed on the standard sheet. * 11 When it becomes positive, it approaches red; when it becomes negative, it approaches green; at Δb * 11 When positive, it approaches yellow; when negative, it approaches blue. Similarly, the aforementioned substrate transmittance chromaticity is the difference between the transmittance chromaticity when the substrate used in an actual optical device is illuminated with a standard light source and the transmittance chromaticity when a transparent substrate is illuminated with a standard light source. That is, it is the difference Δa between the transmittance chromaticity when the substrate used in an actual optical device is illuminated with a standard light source and the transmittance chromaticity when a transparent substrate is illuminated with a standard light source. * 12 When it becomes positive, it approaches red; when it becomes negative, it approaches green; at Δb * 12 When it is positive, it is close to yellow; when it is negative, it is close to blue. A transparent substrate is defined as a substrate whose total light transmittance is 99% or higher when measured by the method specified in JIS K 7375:2008.

[0120] Next, the chromaticity of the film is calculated, i.e., the film chromaticity. The chromaticity of the reflected light from the film surface when illuminated by the standard light source is calculated using the SCI method, i.e., the film reflectance chromaticity (α). * 21 b * 21 ), or the chromaticity of the transmitted light transmitted through the membrane, i.e., the membrane transmission chromaticity (a * 22 b * 22 The aforementioned film reflectance chromaticity is the difference between the chromaticity of the film surface when a standard light source is applied to the film coated on a standard sheet, and the chromaticity of the standard sheet surface when the same standard light source is applied to the same standard sheet. That is, it is the difference Δa between the chromaticity of the film surface when the standard light source is applied and the chromaticity of the standard sheet surface when illuminated by the standard light source. * 21 When it becomes positive, it approaches red; when it becomes negative, it approaches green; at Δb * 21 When positive, it approaches yellow; when negative, it approaches blue. Similarly, the aforementioned film transmittance chromaticity is the difference between the transmittance chromaticity of the film formed on the transparent substrate when irradiated with a standard light source and the transmittance chromaticity of the transparent substrate when irradiated with a standard light source. That is, it is the difference Δa between the transmittance chromaticity of the film formed on the transparent substrate when irradiated with a standard light source and the transmittance chromaticity of the transparent substrate when irradiated with a standard light source. * 22 When it becomes positive, it approaches red; when it becomes negative, it approaches green; at Δb * 22 When it becomes positive, it is close to yellow; when it becomes negative, it is close to blue.

[0121] Furthermore, the colorimetry of the film is determined based on these measurements. That is, in the case of reflective optical devices, the colorimetry of the film that should be equipped with is determined by... * , calculate a * 21 +a * 11 +Δa * 01 b, as the membrane that should be equipped * Calculate b * 21 +b * 11 +Δb * 0, In the case of a transmissive optical device, the a-type film that should be equipped with * , calculate a * 22 +a *12 +Δa * 01 b, as the membrane that should be equipped * Calculate b * 22 +b * 12 +Δb * 01 .

[0122] Furthermore, in the case of reflective optical devices, in order to make this a * 21 +a * 11 +Δ * a 01 The value of b * 22 +b * 12 +Δb * 01 The value is kept as close to zero as possible, and the hue of the film is set by selecting the type and amount of colorant used. Furthermore, in the case of transmissive optical devices, to make this a... * 22 +a * 12 +Δa * 01 The value of b * 22 +b * 12 +Δb * 01 The value should be kept as close to zero as possible, and the hue of the film is set by selecting the type and amount of colorant used.

[0123] It should be noted that the selection of such colorants and amounts can be simulated and calculated based on a database obtained by pre-measuring the colorimetry of the colorants.

[0124] It should be noted that, in the above measurements, it is self-evident that the light receiver needs to be set in the position described above where the measurement can achieve its purpose.

[0125] The light source used in the optical device of the present invention can be any light source as long as it is suitable for display. For example, light sources such as A, C, D50, D65, F2, F6, F7, F8, F10, F11, F12, etc. can be used.

[0126] Example

[0127] (Preparation of Compositions 1 to 26)

[0128] The colorants, dispersants, and solvents shown in the table were mixed to prepare a colorant dispersion. A binder resin, reactive monomer, polymerization initiator, surfactant, and solvent (or reactive diluent) were then added to this colorant dispersion. After thorough mixing, the mixture was filtered to obtain the compositions shown in Tables 1 to 7. It should be noted that in the tables, "material" corresponds to the English word "material".

[0129] It should be noted that in the tables, IR represents the colorant A used as an opaque colorant, IRB represents CI Pigment Black, A1103 represents "Cromofin Black A1103" manufactured by Daihatsu Seika Co., Ltd., and Irgaphor represents "Irgaphor Black" manufactured by BASF. Furthermore, PR is an abbreviation for CI Pigment Red, PB for CI Pigment Blue, PY for CI Pigment Yellow, and PV for CI Pigment Violet. In addition, CB is carbon black "MA100" manufactured by Mitsubishi Kemical Co., Ltd., BZMA is benzyl methacrylate manufactured by Tokyo Chemical Industry Co., Ltd., MAA is methacrylic acid manufactured by Mitsubishi Gas Chemical Co., Ltd., BYK167 is DISPERBYK-167 manufactured by Big Kemi Japan Co., Ltd., DPHA is dipentaerythritol hexaacrylate manufactured by Diesel Ornex Co., Ltd., and Omnirad 907 is formerIrgacure manufactured by IGM Resins BV Co., Ltd. 907 and F477 are F477 manufactured by Die & Ike Co., Ltd., PGMEA is propylene glycol monomethyl ether acetate manufactured by Hayashi Junya Kogyo Co., Ltd., EEP is ethyl 3-ethoxypropionate manufactured by Kamijou Organic Chemical Co., Ltd., and YED811 is alkyl monoglycidyl ether reactive diluent YED811 manufactured by Mitsubishi Kemica Co., Ltd.

[0130] (Preparation of the films from Examples 1-12 and Comparative Examples 1-11)

[0131] Next, compositions 1-12 and 15-24 were applied to the substrates shown in Tables 8-11 and 13 using a die coater, as shown in each table. The substrates were then dried in an oven set at 90°C for 10 minutes to remove the solvent. Further, the adhesive resin was cured by exposure to ultraviolet light, resulting in sheets with films of the thicknesses shown in each table formed on the substrate surface.

[0132] (Preparation of the sheet in Example 13)

[0133] Composition 13 was applied to the substrate shown in Table 12 using a die lip coater, and then exposed to an ultraviolet irradiation machine to cure the adhesive resin, resulting in a sheet with a film of the thickness shown in Table 12 formed on the substrate surface. It should be noted that in Example 13, a release layer formed of a resin with release properties was applied to the surface of the substrate before the composition was applied using a gravure coater, and this was used as a pre-formed substrate. Therefore, the film could be peeled off from the substrate.

[0134] (Preparation of the membrane in Example 14)

[0135] Composition 14 is added to a hopper and heated to above the melting point of the binder in composition 14 to melt composition 14. The molten composition 14 is extruded through a T-die with the opening degree of the die lip controlled in such a way that the film thickness is as shown in Table 12. The molten film is cooled by a cooling roller, and the solidified film is pulled and conveyed to a winding machine for winding to obtain a roll film.

[0136] (Measurement of membrane thickness)

[0137] The thickness of the obtained film was measured using either a "DektakXT-S" manufactured by Blu-ray Japan Co., Ltd. or a "High-Precision Digital Micrometer MDH-25MC" manufactured by Mitsutoyo Co., Ltd. In Examples 1-13 and Comparative Examples 1-11, the film was scratched using a diamond cutter to expose the substrate, and the height difference between the film surface and the substrate was measured using a Blu-ray Japan Co., Ltd. "DektakXT-S" to obtain the film thickness. In Example 14, the film thickness was directly measured using a "High-Precision Digital Micrometer MDH-25MC" manufactured by Mitsutoyo Co., Ltd.

[0138] (Measurement of light transmittance)

[0139] The light transmittance of the obtained film was measured using an Otsuka Electronics Co., Ltd. “LCF-100MA” MCPD9800 spectrometer 3683C with an exposure time of 30 msec, a cumulative number of exposures of 4, a sensitivity of Normal, and a chromaticity (C light source). The wavelength range of 380 nm to 780 nm was measured in 1 nm increments.

[0140] In addition, the light transmittance of the light-shielding colorant A was measured by using a transparent acrylic resin (a copolymer of benzyl methacrylate / methacrylic acid = 70 / 30 (molar ratio): polystyrene with an equivalent weight average molecular weight of 30,000) as a binder, and a film with a thickness of 1 μm was formed on a glass substrate at a concentration of 50% by weight.

[0141] Examples 1-12 and Comparative Examples 1-11 show values ​​obtained from transmission spectra measured directly on the sheets using each substrate as a reference. Example 13 shows an evaluation sample prepared separately with alkali-free transparent glass, on which a resin composition layer was transferred to the surface of the alkali-free transparent glass using a roller transfer printing apparatus, and values ​​obtained from transmission spectra measured using the alkali-free transparent glass as a reference. Example 14 shows values ​​obtained from transmission spectra measured directly on the film.

[0142] (Fabrication of organic EL components)

[0143] After fabricating the TFT substrate with the dam frame, a buffer film (PEDT: poly(3,4)ethylenedioxythiophene / polystyrene sulfonic acid (manufactured by Stark Vitek Co., Ltd., trade name: Baytron PCH8000) with a film thickness of 0.1 μm was formed using an inkjet printer. Similarly, red phosphor ink (LUMATION RP-221 (manufactured by Sameison Co., Ltd.)) was filled into the red pixels, green phosphor ink (LUMATION GP-1200 (manufactured by Sameison Co., Ltd.)) was filled into the green pixels, and blue phosphor ink (LUMATION) was filled into the blue pixels. After removing the solvent from BP-105 (manufactured by Symion Co., Ltd.), a phosphor layer was formed. After thoroughly removing the solvent in a vacuum, a charge injection layer (IL40) was filled using an inkjet printer. The solvent was then dried and removed. A high-purity Al-Mg film was formed by vapor deposition as a cathode, and a silicon nitride film was formed by CVD to obtain an organic EL device.

[0144] (Adhesion of the film to the surface of the organic EL element)

[0145] A transparent UV-curable resin was coated onto the organic EL element fabricated above using a spin coater, and a sheet or film was then laminated onto the UV-curable resin-coated organic EL element. Next, the UV-curable resin filling the gap between the organic EL element and the film was irradiated to cure it, thus bonding and fixing the sheet or film to the organic EL element. It should be noted that, regarding the sheet in Example 13, the substrate was peeled off and removed after lamination.

[0146] (Evaluation of brightness)

[0147] Based on the light transmittance measurement results of the membrane, the average value T1 (%) of the light transmittance measured per 1 nm in the range of 400 nm to 660 nm was calculated and used as the evaluation index of brightness. The range of 25% to 90% was set as A, 0% or more and less than 25% was set as B, and more than 90% and less than 100% was set as C. A was judged as good.

[0148] (Evaluation of color vividness)

[0149] Based on the light transmittance measurement results of the membrane, the light transmittance was measured every 1 nm from 400 nm to 660 nm. The average light transmittance from 640 nm to 660 nm was set as T2 (%), the average light transmittance from 580 nm to 620 nm was set as T3 (%), the average light transmittance from 460 nm to 480 nm was set as T4 (%), and the average light transmittance from 420 nm to 440 nm was set as T5 (%). The values ​​of T2-T3 and T4-T5 were calculated and evaluated as follows. A score of B or above indicates good color vividness.

[0150] A: The values ​​of T2-T3 and T4-T5 are both above 5%.

[0151] B: The value of T2-T3 is above 5%, and the value of T4-T5 is less than 5%.

[0152] C: The value of T2-T3 is above 3% and less than 5%.

[0153] D: The value of T2-T3 is greater than 2% and less than 3%.

[0154] E: The value of T2-T3 is less than 2%.

[0155] (Evaluation of color balance)

[0156] Based on the light transmittance measurement results of the membrane, the absolute values ​​of the differences between the maximum and average values ​​of the light transmittance (%) at wavelengths of 460nm, 530nm, and 640nm, as well as the absolute values ​​of the differences between the average and minimum values, were calculated. The larger value was used as the color difference. That is, the closer the color difference is to 0, the closer it is to a neutral hue. Cases with a color difference within 3% were designated as A, cases exceeding 3% but within 6% were designated as B, cases exceeding 6% but below 10% were designated as C, cases exceeding 10% were designated as D, and cases above B were judged as good.

[0157] (Durability evaluation)

[0158] Using the prepared sheet or film, fixed to a base reciprocating at 2 cm per second, a sliding tester was used to press against a stainless steel ball with a radius of curvature of 5 mm and a load of 240 g. Samples were tested 500 times up to 1000 times. The sample was then disassembled to observe the opposing oriented film. The sliding tester was continued until damage was observed. The highest number of times no damage was observed was defined as the sliding resistance test. Furthermore, the sliding performance was evaluated using the following criteria. A grade was designated as good.

[0159] A: Withstands over 500 slip cycles.

[0160] B: The number of sliding cycles is less than 500.

[0161] (Showing quality evaluation)

[0162] With the fabricated sheet or film bonded to the organic EL element as described above, an image is displayed and visually identified by the naked eye. The display quality is then evaluated as follows, with C or above considered good.

[0163] A: The color and odor are neutral, and the colors are vivid with excellent visual recognition.

[0164] B: Although worse than A, visual recognition is very good.

[0165] C: Although worse than B, visual recognition is good.

[0166] D: Color balance and color vividness are significantly worse than A, B, and C, resulting in poor visual recognition.

[0167] E: Visual recognition is very poor or cannot be evaluated.

[0168] (Evaluation results of organic EL elements with laminated films)

[0169] Compared with the films of Comparative Examples 1-11, the films of Examples 1-14 containing the light-shielding colorant A exhibit higher sharpness of pixels of each color, especially with respect to red pixels, where the effect is particularly significant. Furthermore, each pixel is brighter, resulting in excellent visual recognizability.

[0170] (Examples 15-18, Comparative Examples 12-13)

[0171] On a 125μm thick PET film with one side having undergone a demolding treatment, a resin composition obtained by mixing urethane resin dissolved in an organic solvent with titanium dioxide and CI pigment yellow 129 is coated by a reverse coating machine by heating and drying at 100°C for 2 minutes to achieve a thickness of 250μm, forming a yellowish-white urethane resin sheet.

[0172] Next, as shown in Table 14, compositions 12 (Examples 17 and 18), 18 (Comparative Examples 12 and 13), 25 (Example 15), and 26 (Example 16) were coated onto a yellowish-white urethane resin sheet using a die coater. The coatings were dried in an oven set to 90°C for 10 minutes to remove solvent flaking, and then exposed to a UV irradiator to cure the adhesive resin, forming a film with a thickness of 10 μm. The PET film was then peeled off to obtain a sheet with dimensions of 1.2 m x 1.8 m.

[0173] (Evaluation of color saturation)

[0174] A D65 or A light source, positioned at a distance of approximately 50 cm, was used to illuminate the film surface from the side of the film bonded to it at a 30-degree angle. The chromaticity (a) of the reflected light near the film surface was measured using the SCI method with a spectrophotometer (CM3700d; manufactured by Conicaminodesk Ltd.). * b * The results are shown in Table 14. It should be noted that, compared to the color difference of completely achromatic colors, the chromaticity of completely achromatic colors is set to (a). * 0 = 0, b * The difference when 0 = 0 is Δa * =|a * -a0 * |、Δb * =|b * -b0 * The calculated value is derived from SQRT{(Δa)} * ) 2 +(Δb * ) 2 The calculation formula is used to determine whether a result of D or above is considered good.

[0175] A: The color difference from completely achromatic colors is less than 3.0.

[0176] B: The color difference from completely achromatic colors is greater than 3.0 and less than 5.0.

[0177] C: The color difference from completely achromatic colors is greater than 5.0 and less than 7.5.

[0178] D: The color difference from completely achromatic colors is greater than 7.5 and less than 10.0.

[0179] E: The color difference from completely achromatic colors is greater than 10.0.

[0180] (Screen construction for short-throw projectors)

[0181] A skirt made of polyurethane elastomer resin is installed at the lower end of the sheet produced above, and a telescopic rod and a base with a shaft and spring inside for winding the sheet are installed. An aluminum top rod is installed at the upper end of the sheet to lift the screen evenly in the width direction, thus producing a screen for a short-throw projector.

[0182] (Evaluation results of screens for short-throw projectors with stacked panels)

[0183] The projector image was projected onto the short-throw projector screen using the sheets of Examples 15 and 17 at a distance of about 1m from the center in the left-right direction and the lower side in the up-down direction. As a result, compared with the case of the same projection onto the short-throw projector screen using the sheet of Comparative Example 12, the colors of the projector image were faithfully reflected.

[0184] Furthermore, a projector image with an overall reddish tint was projected onto a short-throw projector screen using the sheets of Examples 16 and 18 at a distance of approximately 1 m from the center in the left-right direction and the lower side in the up-down direction. As a result, compared with the case where the same projection was performed on a short-throw projector screen using the sheet of Comparative Example 13, the reddish tint of the projector image was eliminated.

[0185] [Table 1]

[0186]

[0187] [Table 2]

[0188]

[0189] [Table 3]

[0190]

[0191] [Table 4]

[0192] Table 4

[0193]

[0194] [Table 5]

[0195]

[0196] [Table 6]

[0197]

[0198] [Table 7]

[0199]

[0200] [Table 8]

[0201]

[0202] [Table 9]

[0203]

[0204] [Table 10]

[0205]

[0206] [Table 11]

[0207]

[0208] [Table 12]

[0209] Table 12

[0210]

[0211] [Table 13]

[0212]

[0213] [Table 14]

[0214]

[0215] Explanation of symbols

[0216] 1: Opacifying Colorant A

[0217] 2: Red coloring agent

[0218] 3: Yellow coloring agent

[0219] 4: Blue colorant

[0220] 5: Purple colorant

[0221] 10: Adhesive

[0222] 50: Substrate

[0223] 51: Opaque substrate

[0224] 52: Transparent substrate

[0225] 53: Reflective film

[0226] 60: Other layers

[0227] 70: Monitor

[0228] 100: Membrane

[0229] 110: film

[0230] 120: Light source

[0231] 130: Reflected light

[0232] 140: Transmitted light.

Claims

1. A film formed from a composition containing a light-shielding colorant A, a red colorant, and a binder, the light-shielding colorant A being a colorant whose average light transmittance at wavelengths of 660 nm to 1000 nm is 30% or more and whose average light transmittance at wavelengths of 380 nm or more and less than 660 nm is 20% or less when a film is formed on a glass substrate with a transparent acrylic resin as the binder at a concentration of 50% by weight and a film thickness of 1 μm, wherein, when the average light transmittance of the film at wavelengths of 400 nm to 660 nm is set as Tl in %, Tl is 25% to 90% in %, and the thickness of the film is 0.2 μm to 1000 μm.

2. The film according to claim 1, further containing a second colorant as a colorant other than the light-shielding colorant A and the red colorant, the second colorant being a colorant having an absorption in the visible light region.

3. The film according to claim 2, the second colorant being at least one selected from a yellow colorant and a blue colorant.

4. The film according to claim 3, containing both a yellow colorant and a blue colorant as the second colorant.

5. The film according to any one of claims 1 to 4, all or a part of the light-shielding colorant A being a compound selected from azomethine compounds, perylene compounds, bis-benzofuranone compounds, and azo compounds.

6. The film according to any one of claims 1 to 4, the content of the light-shielding colorant A being 15% to 44% by weight, when the total of the colorants contained in the film is set as 100% by weight.

7. The film according to any one of claims 1 to 4, further containing a violet colorant.

8. The film according to claim 7, the content of the violet colorant being 1% to 10% by weight, when the total of the colorants contained in the film is set as 100% by weight.

9. The film according to any one of claims 1 to 4, wherein, when the average light transmittance of the film at wavelengths of 640 nm to 660 nm is set as T2 in %, and the average light transmittance at wavelengths of 580 nm to 620 nm is set as T3 in %, T2 - T3 is 3% or more.

10. The film according to any one of claims 1 to 4, wherein, when the average light transmittance of the film at wavelengths of 460 nm to 480 nm is set as T4 in %, and the average light transmittance at wavelengths of 420 nm to 440 nm is set as T5 in %, T4 - T5 is 3% or more.

11. The film according to any one of claims 1 to 4, wherein, when the larger value of the absolute value of the difference between the maximum value and the average value of the light transmittance of the film at wavelengths of 460 nm, 530 nm, and 640 nm, and the absolute value of the difference between the average value and the minimum value of the light transmittance at the three wavelengths, is set as the color difference, the color difference is within 6%, the average value being the average of the light transmittance at wavelengths of 460 nm, 530 nm, and 640 nm.

12. The film according to any one of claims 1 to 4, which has adhesion.

13. A sheet having a substrate and the film according to any one of claims 1 to 12.

14. The sheet according to claim 13, wherein the colorimetry (a ＊ , b ＊ ) of the reflected light or the transmitted light in the SCI mode when measured using the D65 light source as the light source is -10 < a ＊ ≤ 10 and -10 < b ＊ ≤ 10.

15. The sheet according to claim 13, wherein the colorimetric values (a ＊ , b ＊ ) of the reflected light or the transmitted light in the SCI mode when measured using the A light source as the light source are -10 < a ＊ ≤ 10 and -10 < b ＊ ≤ 10.

16. An optical device which is provided with a light source and a sheet, the sheet being a sheet in which the film according to any one of claims 1 to 12 is provided on a substrate, the chromaticity (a ＊ , b ＊ ) of transmitted light or reflected light of light which has been incident on the sheet from the light source being -10 < a ＊ ≤ 10 and -10 < b ＊ ≤ 10.

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