Heat-shielding films, adhesive films, and heat-shielding glass substrates

Abstract

To provide a heat-shielding film that can maintain a neutral color tone for transmitted colors. [Solution] The heat-shielding film 1 comprises a laminate consisting of a base layer 2 and a heat-shielding layer 3. The heat-shielding layer 3 contains cesium-doped tungsten oxide (A1) and a coloring agent (B) containing a first coloring agent (B1) and a second coloring agent (B2). When the ratio of cesium-doped tungsten oxide (A1) to the entire heat-shielding layer 3 is Y by mass%, and the thickness of the heat-shielding layer 3 is Z μm, the product of Y and Z is 57 or more. The laminate has L as defined in JIS Z 8781-4. * a * b * In color systems, the transparent color a * and b * However, -3.0 ≤ a * ≤ +3.0 and -3.0 ≤ b * It satisfies ≤ +3.0.

Description

[Technical Field]

[0001] This disclosure relates to heat-shielding films, adhesive films, and heat-shielding glass substrates. [Background technology]

[0002] Patent Document 1 describes a film for shielding heat rays when installed on a window panel, comprising a base film made of transparent resin and an infrared absorbing layer provided on at least one side of the base film, wherein the infrared absorbing layer contains a metal compound that absorbs near-infrared rays, the heat-shielding film contains a coloring pigment, the visible light transmittance is 65% or more, and the shielding coefficient is 0.8 or less, L * a * b * In the chromaticity diagram of a color system, saturation C * A heat-shielding film is disclosed characterized in that the ratio is 3 or less. The heat-shielding film is disclosed to have excellent visible light transmission performance and near-infrared shielding performance, and to have minimal chromatic coloring. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2015-025833 [Overview of the project] [Problems that the invention aims to solve]

[0004] The heat-shielding films described above suffer from significant color changes in the transmitted color due to degradation caused by ultraviolet rays, making it difficult to maintain a neutral color tone.

[0005] The object of this disclosure is to provide a heat-shielding film, an adhesive film, and a heat-shielding glass substrate that can maintain a neutral color tone of the transmitted color. [Means for solving the problem]

[0006] The heat insulation film according to one aspect of the present disclosure includes a laminate composed of a base material layer made of a resin film and a heat insulation layer disposed on one surface of the base material layer. The heat insulation layer contains cesium-doped tungsten oxide (A1), and a colorant (B) including a first colorant (B1) and a second colorant (B2). The first colorant (B1) has an a * a * of the reflected color in the L * a * >0 in the a * a * b * of the reflected color in the b * b * >0 and the b * of the reflected color of the second colorant (B2) is greater than the b * of the reflected color of the first colorant (B1). When the ratio of the cesium-doped tungsten oxide (A1) to the entire heat insulation layer is Y mass% and the thickness of the heat insulation layer is Z μm, the product of Y and Z is 57 or more. The a * a * b * of the transmitted color in the L * and b * of the laminate satisfy -3.0 ≦ a * ≦ +3.0 and -3.0 ≦ b * ≦ +3.0.

[0007] The adhesive film according to one aspect of the present disclosure includes the heat insulation film and an adhesive layer disposed on one surface of the heat insulation film.

[0008] The heat insulation glass substrate according to one aspect of the present disclosure includes the adhesive film and a glass substrate. The adhesive film is bonded to the glass substrate.

[0009] A heat-shielding glass substrate according to one aspect of the present disclosure comprises a heat-shielding film, an adhesive resin layer, and a glass substrate. The adhesive resin layer includes at least one selected from the group consisting of polyvinyl butyral resin, ethylene vinyl acetate resin, and thermoplastic polyurethane resin. The adhesive resin layer is interposed between the heat-shielding film and the glass substrate. [Effects of the Invention]

[0010] According to this disclosure, it is possible to provide a heat-shielding film that can maintain a neutral color tone of the transmitted color. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a schematic cross-sectional view showing an example of a heat-shielding film in one embodiment of the present disclosure. [Figure 2] Figure 2 is a schematic cross-sectional view showing an example of a heat-shielding film in one embodiment of the present disclosure. [Figure 3] Figure 3 is a schematic cross-sectional view showing an example of an adhesive film in one embodiment of the present disclosure. [Figure 4] Figure 4 is a schematic cross-sectional view showing an example of an adhesive film in one embodiment of the present disclosure. [Figure 5] Figure 5 is a schematic cross-sectional view showing an example of a heat-shielding glass substrate having the adhesive layer of the present disclosure. [Figure 6] Figure 6 is a schematic cross-sectional view showing an example of a heat-shielding glass substrate having the adhesive layer of this disclosure. [Figure 7] Figure 7 is a schematic cross-sectional view showing an example of a heat-shielding glass substrate having the adhesive resin layer of the present disclosure. [Figure 8] Figure 8 is a schematic cross-sectional view showing an example of a heat-shielding glass substrate equipped with the adhesive resin layer of this disclosure. [Modes for carrying out the invention]

[0012] Embodiments will now be described. Note that the embodiments described below are only a selection of the various embodiments of this disclosure. The embodiments described below can be modified in various ways depending on the design, etc., as long as the objectives of this disclosure are achieved. While mechanisms of action and effect may be described below, these mechanisms are all inferred, and this disclosure is not bound by the descriptions of mechanisms.

[0013] 1. Overview The heat-shielding film 1 according to the embodiment comprises a laminate consisting of a base layer 2 made of a resin film and a heat-shielding layer 3 disposed on one surface of the base layer 2. The heat-shielding layer 3 contains cesium-doped tungsten oxide (A1) and a coloring agent (B) including a first coloring agent (B1) and a second coloring agent (B2). The first coloring agent (B1) is defined as L in JIS Z 8781-4. * a * b * a of the reflective color in the color system * However, a * Satisfies >0. The second coloring agent (B2) is L as defined in JIS Z 8781-4. * a * b * The b of the reflected color in the color system * However, b * The condition >0 is satisfied, and the reflective color of the second colorant (B2) is b * The first colorant (B1) has a reflective color of b * It is greater than. When the ratio of cesium-doped tungsten oxide (A1) to the entire heat-shielding layer 3 is Y by mass%, and the thickness of the heat-shielding layer 3 is Z μm, the product of Y and Z is 57 or more. The laminate is L as defined in JIS Z 8781-4. * a * b * In color systems, the transparent color a * and b * However, -3.0 ≤ a * ≤ +3.0 and -3.0 ≤ b * It satisfies ≤ +3.0.

[0014] The above configuration allows the neutral color tone of the heat-shielding film 1 according to the embodiment to be maintained. The exact reason why the neutral color tone of the heat-shielding film 1 can be maintained is not clear, but it is presumed to be due to the following reasons.

[0015] The heat-shielding film 1 comprises a laminate consisting of a base layer 2 and a heat-shielding layer 3, and the laminate has L as defined in JIS Z 8781-4. * a * b * In color systems, the transparent color a * and b * However, -3.0 ≤ a * ≤ +3.0 and -3.0 ≤ b * The condition ≤ +3.0 is satisfied. Therefore, the heat-shielding film 1 may have a neutral color tone for its transmitted light. The heat-shielding layer 3 contains cesium-doped tungsten oxide (A1) to efficiently enhance the heat-insulating function of the heat-shielding film 1. Cesium-doped tungsten oxide (A1) may color the transmitted light of the heat-shielding film 1 blue. In contrast, the heat-shielding layer 3 contains a coloring agent (B) to counteract the coloring of the transmitted light caused by cesium-doped tungsten oxide (A1). Furthermore, coloring agent (B) includes two types of coloring agents: a first coloring agent (B1) and a second coloring agent (B2) that satisfy specific conditions. The first coloring agent (B1) is defined as L in JIS Z 8781-4. * a * b * a of the reflective color in the color system * However, a * Satisfying >0, and the first coloring agent (B1) a * is the second coloring agent (B2) a * Larger than. The second coloring agent (B2) is L as defined in JIS Z 8781-4. * a * b * The b of the reflected color in the color system * However, b * Satisfying >0, and the second coloring agent (B2) b * is the b of the first coloring agent (B1) *It is larger than this. By using two types of colorants that meet these specific conditions, even if the heat-shielding film 1 is exposed to ultraviolet light and deteriorates, the neutral color tone of the transmitted color of the heat-shielding film 1 can be maintained.

[0016] In this disclosure, the neutral color tone of the transmitted color of the heat-shielding film 1 is defined as L as defined in JIS Z 8781-4. * a * b * In color systems, the transparent color a * and b * However, -3.0 ≤ a * ≤ +3.0 and -3.0 ≤ b * This means that the condition ≤ +3.0 is satisfied. * a * , b * The values ​​are defined in JIS Z 8781-1 as the CIE 1931 standard color system X, Y, Z and the CIE 1964 auxiliary standard color system X. 10 , Y 10 , Z 10 It is calculated using X, Y, Z and X 10 , Y 10 , Z 10 This is determined from measurements based on JIS Z 8722. The above L * This is an indicator representing brightness. (a) * is, +a * The red direction, -a * This is the chromaticity representing the green direction. (See b above) * is, +b * Yellow direction, -b * This is the chromaticity that represents the blue direction.

[0017] 2.Details 2.1 Heat-shielding film The heat-shielding film 1 according to the embodiment will be described in detail. The heat-shielding film 1 comprises a laminate consisting of a base layer 2 and a heat-shielding layer 3 (see Figure 1).

[0018] <Base material layer> The base layer 2 consists of a resin film. Examples of resins included in the resin film include polyethylene, polypropylene, polyethylene terephthalate (PET), poly(meth)acrylate, polyvinyl chloride, polyethylene naphthalate (PEN), polycarbonate (PC), polyarylate, polystyrene (PS), triacetylcellulose, aromatic polyamide, polyether ether ketone, polylactic acid, polyvinyl alcohol, polysulfone, polyethersulfone, polyvinylidene fluoride, polyimide, or polyetherimide. Among these, polyethylene terephthalate (PET) is preferred from the viewpoint of transparency and cost. The resin film may be a single layer or a multilayer consisting of the same or different types of resin layers. The surface of the resin film may be subjected to corona treatment, plasma treatment, or an easy-adhesion layer or primer layer to improve adhesion with the heat-shielding layer.

[0019] The thickness of the base layer 2 is, for example, 20 μm or more and 500 μm or less. In this case, the handling properties when manufacturing the heat-shielding film 1 are excellent. This thickness is preferably 30 μm or more. This thickness is preferably 200 μm or less.

[0020] <Heat-shielding layer> The heat-shielding layer 3 has the function of blocking near-infrared rays (wavelength 800-2500 nm) from entering the room from the outside by absorbing or reflecting them.

[0021] The heat-shielding layer 3 is arranged on one surface of the base layer 2. For example, the heat-shielding layer 3 may be arranged on only one surface of the base layer 2 (see Figure 1). In this case, the heat-shielding film 1 comprises a laminate consisting of the base layer 2 and the heat-shielding layer 3, with the base layer 2 and the heat-shielding layer 3 being laminated in this order. Alternatively, the heat-shielding layer 3 may be arranged on both surfaces of the base layer 2 (see Figure 2). In this case, the heat-shielding film 1 comprises a laminate consisting of a first heat-shielding layer 31, the base layer 2, and a second heat-shielding layer 32, with the first heat-shielding layer 31, the base layer 2, and the second heat-shielding layer 32 being laminated in this order. The heat-shielding film 1 in which the heat-shielding layer 3 is arranged on both surfaces of the base layer 2 has the advantage of potentially having higher heat-shielding performance.

[0022] The thickness of the heat-shielding layer 3 is preferably 3.5 μm or more and 20.0 μm or less. If this thickness is 3.5 μm or more, the heat-shielding performance of the heat-shielding film 1 can be improved. If this thickness is 20.0 μm or less, the effect of the blue coloration of the transmitted color caused by cesium-doped tungsten oxide (A1) can be reduced, and the neutral color tone of the transmitted color of the heat-shielding film 1 can be better maintained. This thickness is more preferably 5.0 μm or more, and even more preferably 10.0 μm or more. This thickness is more preferably 18.0 μm or less, and even more preferably 15 μm or less.

[0023] (Cesium-doped tungsten oxide) As already mentioned, the heat-shielding layer 3 contains cesium-doped tungsten oxide (A1). Cesium-doped tungsten oxide (A1) can absorb near-infrared rays. In other words, because the heat-shielding layer 3 contains cesium-doped tungsten oxide (A1), it can absorb or reflect near-infrared rays irradiated from outside, shielding them from entering the room.

[0024] The proportion of cesium-doped tungsten oxide (A1) to the entire heat-shielding layer 3 is preferably 3% by mass or more and 20% by mass or less. If this proportion is 3% by mass or more, the heat-shielding performance of the heat-shielding film 1 can be enhanced. If this proportion is 20% by mass or less, the neutral color tone of the transmitted color of the heat-shielding film 1 can be better maintained. This proportion is more preferably 5% by mass or more, and even more preferably 10% by mass or more. This proportion is more preferably 19% by mass or less, and even more preferably 18% by mass or less.

[0025] In this embodiment, when the ratio of cesium-doped tungsten oxide (A1) to the entire heat-shielding layer 3 is Y by mass%, and the thickness of the heat-shielding layer 3 is Z μm, the product of Y and Z is 57 or more. If this product of Y and Z is lower than 57, it becomes difficult to obtain sufficient heat-shielding performance from the heat-shielding film 1. This product of Y and Z is preferably 80 or more, more preferably 100 or more, even more preferably 130 or more, and particularly preferably 180 or more.

[0026] (Coloring agent) As already mentioned, cesium-doped tungsten oxide (A1) causes the transmitted color of the heat-shielding film 1 to be colored blue, which can impair the neutral color tone of the transmitted color of the heat-shielding film 1. In contrast, if a coloring agent (B) is included in the heat-shielding layer 3, the blue coloration of the transmitted color caused by cesium-doped tungsten oxide (A1) can be reduced. Examples of the form of the coloring agent (B) include inorganic pigments, organic pigments, lakes, and natural dyes, but among these, organic pigments are preferred.

[0027] In this embodiment, the heat-shielding layer 3 contains two types of colorants: a first colorant (B1) and a second colorant (B2). For example, the colorants may deteriorate due to ultraviolet light, etc. If the heat-shielding layer 3 contains only one type of colorant, the effect of the deterioration of the colorant tends to be easily reflected in the color tone of the transmitted color. In contrast, by including two types of colorants in the heat-shielding layer 3, even if the colorants deteriorate due to ultraviolet light, etc., the effect of the deterioration of the colorants can be less easily reflected in the color tone of the transmitted color. The exact reason why including two types of colorants in the heat-shielding layer 3 makes it less likely for the effect of the deterioration of the colorants to be reflected in the color tone of the transmitted color has not been precisely clarified, but it is presumed that by using multiple types of colorants in combination, even if deterioration occurs in each colorant, the effect caused by the deterioration of each colorant tends to be smaller, and as a result, the change in the color tone of the transmitted color is mitigated.

[0028] Furthermore, when the ratio of cesium-doped tungsten oxide (A1) to the entire heat-shielding layer 3 is Y by mass%, and the thickness of the heat-shielding layer 3 is Z μm, if the product of Y and Z is 57 or more, then using only one type of colorant will neutralize the color tone of the transmitted color of the heat-shielding film 1, that is, the a of the transmitted color * and b * For both, -3.0 ≤ a * ≤ +3.0 and -3.0 ≤ b * There is a problem in that it is difficult to satisfy ≤ +3.0. In this embodiment, however, two types of colorants, a first colorant (B1) and a second colorant (B2), are used in combination, which has the advantage of making it easier to neutralize the color tone of the transmitted color of the heat-shielding film 1.

[0029] The first coloring agent (B1) and the second coloring agent (B2) will be explained in more detail below.

[0030] From the viewpoint of more efficiently maintaining the neutral color tone of the transmitted color of the heat shielding film 1, the first colorant (B1) preferably contains a compound having a specific chemical structure. Specifically, the first colorant (B1) preferably contains at least one selected from the group consisting of a compound having a phenylnaphthalene skeleton, a compound having a diketopyrrolopyrrole skeleton, and a compound having a quinacridone skeleton.

[0031] The first colorant (B1) is used to adjust the a in the transmitted color in the L * a * b * color system defined in JIS Z8781-4 of the laminate composed of the base material layer 2 and the heat shielding layer 3. * For this reason, the first colorant (B1) preferably satisfies specific conditions for the a in the reflected color in the L * a * b * color system defined in JIS Z8781-4. *

[0032] In an embodiment, the first colorant (B1) satisfies a * a * b * > 0 for the a in the reflected color in the L * color system defined in JIS Z8781-4. This a * preferably satisfies a * > 20.0, more preferably satisfies a * > 25.0, and even more preferably satisfies a * > 30.0. This a * preferably satisfies a * < 45.0, more preferably satisfies a * < 40.0, and even more preferably satisfies a * < 35.0. In this case, for the a in the transmitted color in the L * color system defined in JIS Z8781-4 of the laminate composed of the base material layer 2 and the heat shielding layer 3. * a * b * * ​​This makes it easier to bring the value closer to zero. As a result, the neutral color tone of the transmitted color of the heat-shielding film 1 can be better maintained.

[0033] Furthermore, the first coloring agent (B1) is L as defined in JIS Z 8781-4. * a * b * The b of the reflected color in the color system * However, it may be a positive or negative value, but it is preferably a red coloring agent. In this case, the laminate consisting of the base layer 2 and the heat shielding layer 3 is defined as L in JIS Z 8781-4. * a * b * In color systems, the transparent color a * and b * This makes it easier to bring both of these values ​​closer to zero. As a result, the neutral color tone of the transmitted color of the heat-shielding film 1 can be further maintained.

[0034] The red coloring agent is preferably one that belongs to the Pigment Red group in the Color Index International (CI). For example, the red coloring agent includes at least one selected from the group consisting of CI Pigment Red 2, CI Pigment Red 9, CI Pigment Red 144, CI Pigment Red 166, CI Pigment Red 188, CI Pigment Red 202, CI Pigment Red 214, and CI Pigment Red 254. Among these, it is particularly preferable that the red coloring agent includes CI Pigment Red 254. In this case, the neutral tone of the transmitted color of the heat-shielding film 1 can be particularly maintained.

[0035] Furthermore, the ratio of the first coloring agent (B1) to the entire heat-shielding layer 3 is preferably 0.05% by mass or more and 3.00% by mass or less. In this case, the neutral color tone of the transmitted color of the heat-shielding film 1 can be better maintained. This ratio is more preferably 0.50% by mass or more, and even more preferably 1.00% by mass or more. This ratio is more preferably 2.50% by mass or less, and even more preferably 2.00% by mass or less.

[0036] Furthermore, it is preferable that the mass ratio of the first colorant (B1) to the cesium-doped tungsten oxide (A1) is 1 / 100 or more and 1 / 5 or less. In this case, the neutral color tone of the transmitted color of the heat-shielding film 1 can be further maintained. This mass ratio is more preferably 3 / 100 or more, and even more preferably 1 / 20 or more. This mass ratio is more preferably 3 / 20 or less, and even more preferably 1 / 10 or less.

[0037] From the viewpoint of more efficiently maintaining the neutral color tone of the transmitted color of the heat-shielding film 1, it is preferable that the second colorant (B2) contains a compound having a specific chemical structure. Specifically, it is preferable that the second colorant (B2) contains at least one compound selected from the group consisting of compounds having an isoindole skeleton, compounds having an isoindoline skeleton, compounds having an isoindolinone skeleton, and compounds having a quinoxaline skeleton.

[0038] The second coloring agent (B2) is L as defined in JIS Z 8781-4 for the laminate consisting of the base layer 2 and the heat shielding layer 3. * a * b * The b of the reflected color in the color system * It can be used to adjust the color. In the embodiment, the second colorant (B2) is L as defined in JIS Z 8781-4. * a * b * The b of the reflected color in the color system * However, b * >0 satisfies this b * is, b * It is preferable to satisfy >20.0, b * It is more preferable to satisfy >25.0, b * It is even more preferable to satisfy >30.0. This b * is, b * It is preferable that <50.0 be satisfied, b * It is more preferable to satisfy <45.0, b *It is even more preferable that the <40.0 ratio is satisfied. In this case, the laminate consisting of the base layer 2 and the heat shielding layer 3 has L as defined in JIS Z 8781-4. * a * b * In color systems, the translucent color b * This makes it easier to bring the value closer to zero. As a result, the neutral color tone of the transmitted color of the heat-shielding film 1 can be better maintained.

[0039] In this embodiment, the reflective color of the second colorant (B2) is b * The first colorant (B1) has a reflective color of b * It is larger than the b of the reflected color of the first colorant (B1). * This is the reflective color of the second colorant (B2) b * If the value is greater than this, the chromaticity in the yellow direction of the transmitted color of the laminate consisting of the base layer 2 and the heat shielding layer 3 will be excessively increased, making it difficult to maintain the neutral color tone of the transmitted color of the heat shielding film 1.

[0040] Furthermore, the second coloring agent (B2) is L as defined in JIS Z 8781-4. * a * b * a of the reflective color in the color system * However, it may be a positive or negative value, but it is preferably a yellow coloring agent. In this case, the laminate consisting of the base layer 2 and the heat shielding layer 3 is defined as L in JIS Z 8781-4. * a * b * In color systems, the transparent color a * and b * This makes it easier to bring both of these values ​​closer to zero. As a result, the neutral color tone of the transmitted color of the heat-shielding film 1 can be further maintained.

[0041] The yellow coloring agent is preferably one that belongs to the Pigment Yellow group in the Color Index. For example, the yellow coloring agent includes at least one selected from the group consisting of CI Pigment Yellow 110, CI Pigment Yellow 139, and CI Pigment Yellow 213. Among these, it is particularly preferable that the yellow coloring agent includes CI Pigment Yellow 110. In this case, the neutral tone of the transmitted color of the heat-shielding film 1 can be particularly maintained.

[0042] Furthermore, the ratio of the second colorant (B2) to the entire heat-shielding layer 3 is preferably 0.10% by mass or more and 7.00% by mass or less. In this case, the neutral color tone of the transmitted color of the heat-shielding film 1 can be better maintained. This ratio is more preferably 1.00% by mass or more, and even more preferably 2.00% by mass or more. This ratio is more preferably 6.00% by mass or less, and even more preferably 5.00% by mass or less.

[0043] The mass ratio of the second colorant (B2) to the cesium-doped tungsten oxide (A1) is 1 / 10 or more and 3 / 10 or less. In this case, the neutral color tone of the transmitted color of the heat-shielding film 1 can be further maintained. This mass ratio is more preferably 3 / 20 or more, and even more preferably 1 / 5 or more. This mass ratio is more preferably 27 / 100 or less, and even more preferably 1 / 4 or less.

[0044] The colorant (B) may further contain a third colorant (B3) that is different from the first colorant (B1) and the second colorant (B2), in order to adjust the color tone of the heat-shielding film 1, to the extent that it does not impede the effects of the embodiment. For example, the third colorant (B3) is L as defined in JIS Z 8781-4. * a * b * a of the reflective color in the color system * and b * However, a * Satisfying ≤ 0, and b *The condition ≤0 is satisfied. Furthermore, the third colorant (B3) may include those belonging to groups different from the pigment red group and pigment yellow group in the color index, specifically those belonging to the pigment orange group, pigment violet group, pigment green group, pigment blue group, and pigment black group. The ratio of the third colorant (B3) to the colorant (B) is preferably 50% by mass or less, and more preferably 30% by mass or less. In this case, the effects of the embodiment can be efficiently exhibited. Note that if the colorant (B) does not contain the third colorant (B3), the light transmittance of the heat-shielding film 1 tends to be increased.

[0045] (Binder component) The heat-shielding layer 3 may contain components other than cesium-doped tungsten oxide (A1) and colorant (B). For example, it may contain a binder component for binding cesium-doped tungsten oxide (A1) and colorant (B). The binder component may include, for example, the curable compound (C) or its cured product, a dispersant, etc., as described later.

[0046] 2.2 Characteristics (Transparent color tone) In this embodiment, the laminate consisting of a base layer 2 and a heat shielding layer 3 is defined as L in JIS Z 8781-4. * a * b * In color systems, the transparent color a * However, -3.0 ≤ a * It satisfies ≤ +3.0. This a * However, -3.0 > a * or a * If the value of >+3.0 is met, it becomes difficult to maintain the neutral color tone of the transmitted color of the heat-shielding film 1. Note that if the laminate contains two heat-shielding layers 3, the total light transmittance is measured for the laminate consisting of the base layer 2 and the two heat-shielding layers 3. From the viewpoint of making the color tone of the transmitted color of the heat-shielding film 1 more neutral, this a * -2.0 ≤ a * It is preferable that the following conditions be satisfied, -1.0 ≤ a * It is more preferable that the following conditions be satisfied, -0.5≦a *It is even more preferable to satisfy this a * is, a * It is preferable that ≤2.0 is satisfied, a * It is more preferable that ≤ 1.0 be satisfied, a * It is even more preferable that the condition ≤0.5 is satisfied.

[0047] Furthermore, in the embodiment, the laminate consisting of the base layer 2 and the heat shielding layer 3 is defined as L in JIS Z 8781-4. * a * b * In color systems, the translucent color b * However, -3.0 ≤ b * It satisfies ≤ +3.0. This b * However, -3.0 > b * or b * If the value of >+3.0 is met, it becomes difficult to maintain the neutral color tone of the transmitted color of the heat-shielding film 1. Note that if the laminate has two heat-shielding layers 3, the total light transmittance is measured for the laminate consisting of the base layer 2 and the two heat-shielding layers 3. From the viewpoint of making the color tone of the transmitted color of the heat-shielding film 1 more neutral, this b * -2.0 ≤ b * It is preferable that the following conditions be satisfied, -1.0 ≤ b * It is more preferable that the following condition be satisfied, -0.5≦b * It is even more preferable to satisfy this b. * is, b * It is preferable that ≤2.0 be satisfied, b * It is more preferable that ≤ 1.0 be satisfied, b * It is even more preferable that the condition ≤ 0.5 is satisfied.

[0048] (Changes in the color tone of transmitted light after UV irradiation) In this embodiment, ultraviolet light with a wavelength of 340 nm is used, and the integrated light amount is 2.79 MJ / m 2 When irradiated in such a manner, the laminate consisting of the base layer 2 and the heat shielding layer 3 has L as defined in JIS Z 8781-4. * a * b * In color systems, the transparent color a * Change Δa * However, Δa* It is preferable that ≤2.0 is satisfied. In this case, even if ultraviolet light is irradiated onto the heat-shielding film 1, the transmitted color of the laminate before and after ultraviolet light irradiation is a * Change Δa * Because this is moderately reduced, the neutral color tone of the transmitted color of the heat-shielding film 1 can be particularly maintained. This change amount Δa * is, Δa * It is more preferable that ≤1.5 be satisfied, Δa * It is even more preferable that ≤1.0 be satisfied, Δa * It is particularly preferable that the value equals 0.

[0049] In this embodiment, ultraviolet light with a wavelength of 340 nm is used, and the integrated light amount is 2.79 MJ / m 2 When irradiated in such a manner, the laminate consisting of the base layer 2 and the heat shielding layer 3 has L as defined in JIS Z 8781-4. * a * b * In color systems, the translucent color b * Change Δb * However, Δb * It is preferable that ≤7.0 is satisfied. In this case, even if ultraviolet light is irradiated onto the heat-shielding film 1, the transmitted color of the laminate before and after ultraviolet light irradiation is b * Change Δb * Because this is moderately reduced, the neutral color tone of the transmitted color of the heat-shielding film 1 can be particularly maintained. This change amount Δb * is Δb * It is more preferable that ≤6.0 be satisfied, and Δb * It is even more preferable that ≤5.0 be satisfied, and Δb * It is particularly preferable that the value equals 0.

[0050] (Total light transmittance) The laminate comprising the base layer 2 and the heat-shielding layer 3 according to the embodiment preferably has a total light transmittance of 40% or more, as measured using a D65 light source. In this case, the amount of transmitted color of the heat-shielding film 1 can be increased. When the laminate comprises two heat-shielding layers 3, the total light transmittance is measured for the laminate comprising the base layer 2 and the two heat-shielding layers 3. This total light transmittance is more preferably 30% or more, and even more preferably 40% or more. This total light transmittance can be measured using a known haze meter in accordance with the provisions of JIS K7361-1.

[0051] (Hayes) The haze value of the laminate comprising the base layer 2 and the heat-shielding layer 3 according to the embodiment is preferably 5% or less. In this case, the transparency of light passing through the heat-shielding film 1 is increased. When the laminate comprises two heat-shielding layers 3, the haze value is measured for the laminate comprising the base layer 2 and the two heat-shielding layers 3. Furthermore, this haze value is preferably 4% or less, and more preferably 3% or less. This haze value can be measured, for example, using a known haze meter in accordance with the provisions of JIS K7136.

[0052] 2.3 Manufacturing method As already mentioned, the heat-shielding film 1 can be manufactured by forming a heat-shielding layer 3 on one surface of the base layer 2. In this embodiment, the heat-shielding layer 3 is formed by applying a composition (hereinafter also referred to as composition (X)) containing a cesium-doped tungsten oxide material (A) containing cesium-doped tungsten oxide (A1) and a coloring agent (B) to one surface of the base layer 2. For example, the cesium-doped tungsten oxide material (A) can be a dispersion of cesium-doped tungsten oxide (A) in a solvent (E).

[0053] When applying composition (X), it is sufficient that the thickness of the heat-shielding layer 3 is within the range described above, and the application method is not limited. Any method such as roll coating, spin coating, or dip coating can be used to apply composition (X).

[0054] In this embodiment, composition (X) may contain a curable compound (C) in addition to the cesium-doped tungsten oxide material (A) and the colorant (B). Therefore, after applying composition (X) to the substrate layer 2, the heat-shielding layer 3 is formed by curing the curable compound (C). In this case, the heat-shielding layer 3 may contain a cured product of the curable compound (C).

[0055] The curable compound (C) includes, for example, at least one selected from the group consisting of (meth)acrylic compounds, epoxy compounds, urethane compounds, and silicone compounds. In the embodiment, the composition (X) is cured by irradiation with ultraviolet light. Therefore, it is preferable that the curable compound (C) includes a compound that can be cured when irradiated with ultraviolet light. That is, it is preferable that the curable compound (C) includes a (meth)acrylic compound.

[0056] Furthermore, if the curable compound (C) contains a (meth)acrylic compound, it is preferable that the (meth)acrylic compound contains a (meth)acrylic compound having three or more (meth)acryloyl groups. In this case, the curing of the curable compound (C) can proceed efficiently, so that the deterioration of the colorant (B) can be further suppressed while the heat-shielding layer 3 can be formed. For example, the (meth)acrylic compound having three or more (meth)acryloyl groups is a trifunctional acrylate such as trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, tris-2-hydroxyethyl isocyanurate tri(meth)acrylate, glycerin tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, ditrimethylolpropane tri(meth)acrylate; pentaerythritol tetra(meth) The compound comprises at least one compound selected from the group consisting of acrylates, tetrafunctional acrylates such as ditrimethylolpropanetetra(meth)acrylate and dipentaerythritoltetra(meth)acrylate; pentafunctional acrylates such as dipentaerythritol penta(meth)acrylate and ditrimethylolpropanepenta(meth)acrylate; hexafunctional acrylates such as dipentaerythritol hexa(meth)acrylate and ditrimethylolpropanehexa(meth)acrylate; and polyfunctional (meth)acrylate compounds in which the groups in these acrylates are substituted with alkyl groups or ε-caprolactone.

[0057] Furthermore, if the curable compound (C) contains a compound that can be cured when irradiated with ultraviolet light, composition (X) may also contain a photopolymerization initiator (D). The photopolymerization initiator (D) is a compound that absorbs ultraviolet light and initiates the polymerization reaction in composition (X). Examples of photopolymerization initiators (D) include acetophenones, benzophenones, α-amyloxime esters, and thioxanthones.

[0058] Furthermore, composition (X) may contain a photosensitizer in addition to, or in place of, the photopolymerization initiator (D). Examples of photosensitizers include n-butylamine, triethylamine, tri-n-butylphosphine, and thioxanthone.

[0059] Composition (X) may contain a solvent (E) from the viewpoint of ease of application. If composition (X) contains a solvent (E), it is preferable to apply composition (X) to the substrate layer 2, allow the solvent (E) to evaporate, and then cure composition (X). The solvent (E) is not particularly limited, but it is preferably a compound that can improve the ease of application of composition (X) and is moderately volatile. Specifically, examples include methyl isobutyl ketone, methyl ethyl ketone, acetone, methanol, ethanol, butanol, isopropyl alcohol, isobutyl alcohol, hexane, toluene, xylene, ethyl acetate, butyl acetate, tetrahydrofuran, propylene glycol monomethyl ether, and propylene glycol monomethyl ether acetate.

[0060] Composition (X) may further contain any additives such as dispersants.

[0061] A method for manufacturing the heat-shielding film 1 has been described. When the heat-shielding film 1 comprises a first heat-shielding layer 31 and a second heat-shielding layer 32, the first heat-shielding layer 31 and the second heat-shielding layer 32 may be formed from a composition (X) having the same composition, or they may be formed from compositions (X) having different compositions.

[0062] 3. Usage The heat-shielding film 1 can be applied to various components that require heat shielding properties. The heat-shielding film 1 can be used in close contact with the component. This allows for the manufacture of the heat-shielding component 100.

[0063] 3.1 Usage Pattern 1 One method for adhering the heat-shielding film 1 to a component is to bond the heat-shielding film 1 and the component together using an adhesive. More specifically, an adhesive film 10 can be manufactured by placing an adhesive layer 4 made of an adhesive on the heat-shielding film 1, and then adhering the adhesive film 10 to the component to produce a heat-shielding component 100.

[0064] The specific configuration of the adhesive film 10 will now be described. The adhesive film 10 comprises a heat-shielding film 1 and an adhesive layer 4 on one side of the heat-shielding film 1. For example, the adhesive layer 4 may be arranged on only one side of the heat-shielding film 1 (see Figure 3). In the adhesive film 10 shown in Figure 3, the adhesive layer 4 is arranged on the side of the base layer 2 opposite to the side on which the heat-shielding layer 3 is arranged. The adhesive layer 4, the base layer 2, and the heat-shielding layer 3 are then laminated in this order.

[0065] Furthermore, adhesive layers 4 may be arranged on both sides of the heat-shielding film 1 (see Figure 4). In the adhesive film 10 shown in Figure 4, adhesive layer 41 is arranged on the side of the base layer 2 opposite to the side where the heat-shielding layer 3 is arranged, and adhesive layer 42 is arranged on the side of the heat-shielding layer 3 opposite to the side where the base layer 2 is arranged. In this case, adhesive layer 41, base layer 2, heat-shielding layer 3, and adhesive layer 42 are laminated in this order.

[0066] The adhesive layer 4 can be formed by placing an adhesive on the heat-shielding film 1. For example, if the adhesive is placed on the side of the base layer 2 opposite to the side where the heat-shielding layer 3 is placed, the adhesive layer 4 can be formed on only one side of the heat-shielding film 1. Alternatively, if the adhesive is placed on both sides of the heat-shielding film 1, the adhesive layer 4 can be formed on both sides of the heat-shielding film 1.

[0067] The adhesive may be a semi-solid, viscous thermoplastic resin. In other words, the adhesive layer 4 may contain at least one selected from the group consisting of (meth)acrylic resins, silicone resins, urethane resins, butadiene resins, and natural rubber resins. Among these, it is preferable that the adhesive layer 4 contains a (meth)acrylic resin or a silicone resin. In this case, the effects of the embodiment are more easily exhibited when the heat-shielding film 1 and the member are brought into close contact via the adhesive layer 4.

[0068] The thickness of the adhesive layer 4 can be set appropriately depending on the material to which it is applied, but for example, it is between 1 μm and 300 μm.

[0069] The heat-shielding film 1 can be suitably used with the glass substrate 5 among various components. For example, by laminating the adhesive film 10 to the glass substrate 5, a heat-shielding glass substrate 101 can be manufactured in which the heat-shielding film 1 is provided on the glass substrate 5. For example, in the heat-shielding glass substrate 101 manufactured using the adhesive film 10 shown in Figure 3, the glass substrate 5, the adhesive layer 4, and the heat-shielding film 1 are laminated in this order (see Figure 5). The glass substrate 5 and the adhesive layer 4 can be in direct contact.

[0070] Furthermore, the heat-shielding glass substrate 101 manufactured using the adhesive film 10 may contain multiple glass substrates 5. For example, as shown in Figure 4, in a heat-shielding glass substrate 101 manufactured using the adhesive film 10 in which adhesive layers 4 are arranged on both sides of the heat-shielding film 1, the glass substrate 51, adhesive layer 41, heat-shielding film 1, adhesive layer 42, and glass substrate 52 are laminated in this order (see Figure 6). The glass substrate 51 and the adhesive layer 41 can be in direct contact. The glass substrate 52 and the adhesive layer 42 can be in direct contact.

[0071] 3.2 Usage Pattern 2 The method for adhering the heat-shielding film 1 to a component is not limited to bonding the heat-shielding film 1 and the component via an adhesive material. For example, one method involves arranging the heat-shielding film 1, an adhesive sheet, and a component in that order, and then adhering the heat-shielding film 1 to the component through a heating and pressurizing process. In this case, a heat-shielding component 100 can be manufactured in which an adhesive resin layer 6 made of an adhesive sheet is interposed between the heat-shielding film 1 and the component.

[0072] The adhesive sheet is preferably made of a so-called thermoplastic resin that melts when heated and solidifies when cooled. For example, the adhesive resin layer 6 contains at least one selected from the group consisting of polyvinyl butyral resin, ethylene vinyl acetate resin, and thermoplastic polyurethane resin.

[0073] The thickness of the adhesive resin layer 6 can be set appropriately depending on the member to which it is applied, but for example, it is between 0.1 mm and 1.0 mm.

[0074] As already mentioned, it can be suitably used with the glass substrate 5 among various components. In other words, a heat-shielding glass substrate 102 having an adhesive resin layer 6 can be manufactured using the heat-shielding film 1. In this case, the adhesive resin layer 6 can be interposed between the heat-shielding film 1 and the glass substrate 5.

[0075] For example, if the heat-shielding film 1 is composed of a laminate consisting of one base layer 2 and one heat-shielding layer 3, one method is to arrange the heat-shielding film 1, adhesive sheet, and glass substrate 5 in this order, and then adhere the heat-shielding film 1 to the glass substrate 5 through a heating and pressurizing process. In this way, a heat-shielding glass substrate 102 can be manufactured (see Figure 7). With respect to such a heat-shielding glass substrate 102, the glass substrate 5, adhesive resin layer 6, and heat-shielding film 1 are laminated in this order. The adhesive resin layer 6 is arranged on the side of the base layer 2 opposite to the side on which the heat-shielding layer 3 is arranged.

[0076] The heat-shielding glass substrate 101 equipped with an adhesive resin layer 6 may include multiple glass substrates 5. For example, by placing adhesive sheets on both sides of a heat-shielding film 1, and then bonding glass substrates 51 and 52 to both sides of the heat-shielding film 1 via the adhesive sheets, a heat-shielding glass substrate 102 with adhesive resin layers 6 on both sides of the heat-shielding film 1 can be manufactured (see Figure 8). In this case, the glass substrate 51, adhesive resin layer 61, heat-shielding film 1, adhesive resin layer 62, and glass substrate 52 are laminated in this order.

[0077] 3.3 Summary According to the method described above, if an adhesive is used, a heat-shielding glass substrate 101 can be manufactured comprising an adhesive film 10 and a glass substrate 5, wherein the adhesive film 10 is laminated to the glass substrate 5. Alternatively, if an adhesive sheet is used, a heat-shielding glass substrate 102 can be manufactured comprising a heat-shielding film 1, an adhesive resin layer 6 disposed on one surface of the heat-shielding film 1, and a glass substrate 5, wherein the adhesive resin layer 6 contains at least one selected from the group consisting of polyvinyl butyral resin, ethylene vinyl acetate resin, and thermoplastic polyurethane resin, and the adhesive resin layer 6 is interposed between the heat-shielding film 1 and the glass substrate 5. The heat-shielding glass substrates 101 and 102 are for use in vehicles. More specifically, the heat-shielding glass substrates 101 and 102 can be applied as window glass in vehicles.

[0078] As already mentioned, the heat-shielding film 1 can be applied to various components that require heat shielding properties. Therefore, the heat-shielding film 1 can be used not only to manufacture the heat-shielding glass substrates 101 and 102, but also to manufacture various heat-shielding components 100.

[0079] 4. Appearance This disclosure includes the following aspects.

[0080] A heat-shielding film (1) according to a first aspect of the present disclosure comprises a laminate comprising a base layer (2) made of a single layer of resin film and a heat-shielding layer (3) disposed on one surface of the base layer (2). The heat-shielding layer (3) contains cesium-doped tungsten oxide (A1) and a colorant (B) comprising a first colorant (B1) and a second colorant (B2). The first colorant (B1) is defined as L in JIS Z 8781-4. * a * b * a of the reflective color in the color system * However, a * Satisfies >0. The second coloring agent (B2) is L as defined in JIS Z 8781-4. * a * b * The b of the reflected color in the color system * However, b * The condition >0 is satisfied, and the reflective color of the second colorant (B2) is b * The first colorant (B1) has a reflective color of b * It is greater than or equal to . When the ratio of cesium-doped tungsten oxide (A1) to the entire heat-shielding layer (3) is Y by mass%, and the thickness of the heat-shielding layer (3) is Z μm, the product of Y and Z is 57 or greater. The laminate is L as defined in JIS Z 8781-4. * a * b * In color systems, the transparent color a * and b * However, -3.0 ≤ a * ≤ +3.0 and -3.0 ≤ b * It satisfies ≤ +3.0.

[0081] According to this embodiment, a heat-shielding film (1) that can maintain a neutral color tone of the transmitted color can be provided.

[0082] In the first embodiment, the heat-shielding film (1) according to the second aspect of the present disclosure has a mass ratio of a first coloring agent (B1) to cesium-doped tungsten oxide (A1) of 1 / 100 or more and 1 / 5 or less, and a mass ratio of a second coloring agent (B2) to cesium-doped tungsten oxide (A1) of 1 / 10 or more and 3 / 10 or less.

[0083] A heat-shielding film (1) according to a third aspect of the present disclosure, in the first or second aspect, comprises a first colorant (B1) selected from the group consisting of compounds having a phenylnaphthalene skeleton, compounds having a diketopyrrolopyrrole skeleton, and compounds having a quinacridone skeleton. A second colorant (B2) comprises a second colorant (B2) selected from the group consisting of compounds having an isoindole skeleton, compounds having an isoindoline skeleton, compounds having an isoindolinone skeleton, and compounds having a quinoxaline skeleton.

[0084] The heat-shielding film (1) according to the fourth aspect of this disclosure, in any one of the first to third aspects, allows ultraviolet light with a wavelength of 340 nm to be used when the integrated light amount is 2.79 MJ / m 2 When irradiated in such a manner, the laminated material has L as defined in JIS Z 8781-4. * a * b * In color systems, the transparent color a * Change Δa * and b * Change Δb * However, Δa * ≤2.0 and Δb * It satisfies ≤7.0.

[0085] An adhesive film (10) according to a fifth aspect of the present disclosure comprises a heat-shielding film (1) according to any one of the first to fourth aspects and an adhesive layer (4) disposed on at least one surface of the heat-shielding film (1).

[0086] A heat-shielding glass substrate (101) according to a sixth aspect of this disclosure comprises an adhesive film (10) according to a fifth aspect and a glass substrate (5). The adhesive film (10) is laminated to the glass substrate (5).

[0087] A heat-shielding glass substrate (102) according to a seventh aspect of this disclosure comprises a heat-shielding film (1) according to any one of the first to fourth aspects, an adhesive resin layer (6), and a glass substrate (5). The adhesive resin layer (6) contains at least one selected from the group consisting of polyvinyl butyral resin, ethylene vinyl acetate resin, and thermoplastic polyurethane resin. The adhesive resin layer (6) is interposed between the heat-shielding film (1) and the glass substrate (5). [Examples]

[0088] The present disclosure will be specifically described below with reference to examples.

[0089] 1.Curable composition The components and materials used in the curable compositions of the examples and comparative examples are shown below.

[0090] (Cesium-doped tungsten oxide material (A)) • Cesium-doped tungsten oxide dispersion #1: Cesium-doped tungsten oxide (Cs 0.33 A dispersion of WO3)(A1) in an organic solvent at a concentration of 18.5% by mass.

[0091] The above dispersion was prepared by diluting Sumitomo Metal Mining Co., Ltd.'s product YMF-02A (solid content concentration of 28.5% by mass, including cesium-doped tungsten oxide (A1)) with an organic solvent.

[0092] (Coloring agent (B)) Colorant #1: Red pigment (organic pigment CI Pigment Red 254 (compound having a diketopyrrolopyrrole skeleton)), manufactured by DIC Corporation, product name Microlith3630K (contains 45% by mass of organic pigment, reflects L in the color system) * a * and b * However, L * =45.9, a * =31.2, b * =15.4).

[0093] Colorant #2: Yellow pigment (organic pigment CI Pigment Yellow 110 (compound with an isoindole skeleton)), manufactured by DIC Corporation, product name Microlith2040K (contains 50% by mass of organic pigment, reflectance color L in the color system) * a * and b * However, L * =56.1, a * =30.8, b * =31.7).

[0094] Colorant #3: Orange pigment (organic pigment CI Pigment Orange 22 (compound with naphthol skeleton), L of the reflected color in the color system) * a * and b * is L * =57, a * =48, b * A dispersion obtained by dispersing (=66) in methyl isobutyl ketone so that the pigment content is 12% by mass.

[0095] Colorant #4: Black pigment (carbon black, L of the reflective color in the color system) * a * and b * However, L * =5.1, a * =0.7, b * A dispersion of (1.1) in ethyl acetate to a pigment content of 12% by mass. Manufactured by Taisei Chemical Co., Ltd., product name TSBK-105.

[0096] (Curable compound (C)) Curable compound #1: Dipentaerythritol pentaacrylate, manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name NK Ester A9570-W.

[0097] (Photopolymerization initiator (D)) Photopolymerization initiator #1: 2-hydroxy-1-{4-[4-(2-hydroxy-2-methylpropionyl)-benzyl]-phenyl}-2-methylpropan-1-one, manufactured by IGM Resins BV, product name Omnirad127D.

[0098] (Solvent (E)) Solvent #1: Methyl isobutyl ketone.

[0099] 2. Method for manufacturing heat-shielding film The heat-shielding film was manufactured as follows:

[0100] The curable composition prepared in "1. Curable Composition" is applied to a substrate layer (single-layer PET film (manufactured by Toray Industries, Inc., product name 50U403, thickness: 50 μm)), dried at 80°C for 1 minute to remove the solvent, and then exposed to ultraviolet light at 300 mJ / cm². 2 A heat-shielding layer was formed on the substrate layer by curing the curable composition by irradiation. A heat-shielding film was manufactured in this manner.

[0101] For the examples other than Example 2 and the comparative examples, only a heat-shielding layer (indicated as the first heat-shielding layer in the table) was formed on one side of the substrate layer.

[0102] In Example 2, a first heat-shielding layer and a second heat-shielding layer were formed on both surfaces of the substrate layer, respectively.

[0103] 3. Heat-shielding layer 3.1 Thickness of the heat-shielding layer The thickness of the heat-shielding layer was measured, and the results are shown in the table.

[0104] For all examples except Example 2 and comparative examples, the thickness of the first heat-shielding layer was measured, and the results are shown in the table.

[0105] In Example 2, the thickness of the first and second heat-shielding layers formed on both surfaces of the substrate layer was measured, and the results are shown in the table.

[0106] 3.2 Product of the mass percentage of cesium-doped tungsten oxide and the thickness of the heat-shielding layer For examples other than Example 2 and comparative examples, the product of Y and Z1 was calculated, where Y (mass%) was the ratio of cesium-doped tungsten oxide (A1) to the entire first heat-shielding layer, and Z1 (μm) was the thickness of the heat-shielding layer. The results are shown in the table.

[0107] For Example 2, the product of Y and Z1 was calculated when Y (mass%) was the ratio of cesium-doped tungsten oxide (A1) to the entire first heat-shielding layer and Z1 (μm) was the thickness of the first heat-shielding layer. The product of Y and Z2 was also calculated when Y (mass%) was the ratio of cesium-doped tungsten oxide (A1) to the entire second heat-shielding layer and Z2 (μm) was the thickness of the second heat-shielding layer. The results are shown in the table.

[0108] 4. Evaluation of heat-shielding films 4.1 Translucent Color Tone Using a spectrophotometer (Konica Minolta Japan, Inc., model number CM-3600d), under the conditions of C light source, 10° field of view, measurement diameter 25.4 mmφ, and SCI, the transmitted color L of the laminate of the heat-shielding film was measured. * a * and b * The following measurements were taken. The results are shown in the table.

[0109] For examples other than Example 2 and comparative examples, the laminate consisting of a base layer and a first heat-shielding layer has a transparent color L * a * and b * We measured it.

[0110] In Example 2, the laminate consists of a base layer, a first heat-shielding layer, and a second heat-shielding layer, and the transparent color L * a * and b * We measured it.

[0111] 4.2 Tone of transmitted color after UV irradiation For the heat-shielding film, a lightfastness tester (Q-Lab, model QUV / SE) was used to test the irradiance of ultraviolet light with a wavelength of 340 nm at 1.55 W / m². 2 With the settings adjusted, the integrated light intensity of ultraviolet light with a wavelength of 340 nm at a temperature of 80°C is 2.79 MJ / m². 2 Irradiate in such a manner, and then, using the method described in "4.1 Transmitted Color Tone", the laminate is subjected to the L as defined in JIS Z 8781-4. * a * b *In color systems, the L of transparent color * a * and b * The L values ​​of the laminate before UV irradiation were measured and the results are shown in the table. * a * b * In color systems, the transparent color a * and b * And, the L of the laminate after UV irradiation, as defined in JIS Z 8781-4. * a * b * In color systems, the transparent color a * and b * Therefore, a before and after UV irradiation * Change Δa * and b * Change Δb * This was confirmed. The results are shown in the table.

[0112] 4.3 Total light transmittance Using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., part number NDH7000SP2), the total light transmittance of the laminate of the heat-shielding film in the wavelength range of 380 to 780 nm, as specified in JIS K7361-1, was calculated. The results are shown in the table.

[0113] For examples other than Example 2 and comparative examples, the total light transmittance of the laminate consisting of the base layer and the first heat-shielding layer was measured.

[0114] In Example 2, the total light transmittance of a laminate consisting of a base layer, a first heat-shielding layer, and a second heat-shielding layer was measured.

[0115] 4.4 Haze The haze of the laminated structure of the heat-shielding film was measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., part number NDH7000SP2) as specified in JIS K7136. The results are shown in the table.

[0116] For examples other than Example 2 and comparative examples, the haze of the laminate consisting of the base layer and the first heat-shielding layer was measured.

[0117] In Example 2, the haze of a laminate consisting of a base layer, a first heat-shielding layer, and a second heat-shielding layer was measured.

[0118] [Table 1]

[0119] [Table 2]

[0120] Examples 1-7, which combined two types of colorants, showed a higher L-scale of the laminate under UV irradiation compared to Comparative Example 5, which used only one type of colorant, as defined in JIS Z 8781-4. * a * b * In color systems, the transparent color a * Change Δa * and b * Change Δb * However, it was shown to be small. In other words, in a heat-shielding film equipped with a heat-shielding layer containing cesium-doped tungsten oxide, in order to suppress the change in the color of the transmitted color due to ultraviolet irradiation, it is preferable to use two types of colorants in the heat-shielding layer rather than using one type of colorant, and the a of the reflected color * and b * It was shown that a combination of a red coloring agent and a yellow coloring agent that satisfies certain conditions is particularly preferred. [Explanation of symbols]

[0121] 1. Heat-shielding film 2 Base material layer 3. Heat-shielding layer 4,41,42 Adhesive layer 5, 51, 52 Glass substrate 6,61,62 Adhesive resin layer 101,102 Heat-shielding glass substrate

Claims

1. The laminate comprises a base layer made of a resin film and a heat-shielding layer disposed on one surface of the base layer, The heat-shielding layer contains cesium-doped tungsten oxide (A1) and a coloring agent (B) comprising a first coloring agent (B1) and a second coloring agent (B2). The first coloring agent (B1) is defined as L in JIS Z 8781-4. ＊ a ＊ b ＊ a of the reflected color in the color system ＊ However, a ＊ Satisfying >0, The second colorant (B2) has a b value of the reflected color in the L ＊ ＊ a ＊ b ＊ *a*b color system that satisfies b ＊ ＊ > 0, and the b value of the reflected color of the second colorant (B2) is ＊ greater than the b value of the reflected color of the first colorant (B1). ＊ ＊ ​​ When the ratio of the cesium-doped tungsten oxide (A1) to the entire heat-shielding layer is Y by mass%, and the thickness of the heat-shielding layer is Z μm, the product of Y and Z is 57 or more. The laminate, L as defined in JIS Z 8781-4 ＊ a ＊ b ＊ a of the transparent color in the color system ＊ and b ＊ However, -3.0 ≤ a ＊ ≤ +3.0 and -3.0 ≤ b ＊ Satisfying ≤ +3.0, Heat-shielding film.

2. The mass ratio of the first coloring agent (B1) to the cesium-doped tungsten oxide (A1) is 1 / 100 or more and 1 / 5 or less, and the mass ratio of the second coloring agent (B2) to the cesium-doped tungsten oxide (A) is 1 / 10 or more and 3 / 10 or less. The heat-shielding film according to claim 1.

3. The first coloring agent (B1) comprises at least one selected from the group consisting of compounds having a phenylnaphthalene skeleton, compounds having a diketopyrrolopyrrole skeleton, and compounds having a quinacridone skeleton. The second coloring agent (B2) comprises at least one selected from the group consisting of compounds having an isoindole skeleton, compounds having an isoindoline skeleton, compounds having an isoindolinone skeleton, and compounds having a quinoxaline skeleton. The heat-shielding film according to claim 1.

4. Ultraviolet light with a wavelength of 340 nm has an integrated light intensity of 2.79 MJ / m ２ When irradiated in such a manner, the laminate, as defined in JIS Z 8781-4, ＊ a ＊ b ＊ a of the transparent color in the color system ＊ Change amount Δa ＊ and b ＊ Change Δb ＊ However, Δa ＊ ≤2.0 and Δb ＊ Satisfying ≤ 7.0, The heat-shielding film according to claim 1.

5. A heat-shielding film according to any one of claims 1 to 4, and an adhesive layer disposed on one surface of the heat-shielding film, Adhesive film.

6. The adhesive film described in claim 5 and the glass substrate are provided, The adhesive film is bonded to the glass substrate. Heat-shielding glass substrate.

7. The invention comprises a heat-shielding film according to any one of claims 1 to 4, an adhesive resin layer, and a glass substrate, The adhesive resin layer comprises at least one selected from the group consisting of polyvinyl butyral resin, ethylene vinyl acetate resin, and thermoplastic polyurethane resin. The adhesive resin layer is interposed between the heat-shielding film and the glass substrate. Heat-shielding glass substrate.

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