Interlayer film for laminated glass and laminated glass

Abstract

The present invention provides an interlayer film for a laminated glass, said interlayer film being capable of preventing color transfer.　When the interlayer film for a laminated glass according to the present invention is disposed between two clear glass sheets in accordance with JIS R3202: 1996 to obtain a laminated glass X and the parallel light transmittance of the obtained laminated glass X is measured, the interlayer film includes a colored part that has a parallel light transmittance of lower than 60% and a transparent part that has a parallel light transmittance of 60% or higher. The average thickness of the interlayer film in the colored part is less than the average thickness of the interlayer film in the transparent part, and the absolute value of the difference between the average thickness of the interlayer film in the colored part and the average thickness of the interlayer film in the transparent part is 10 μm or more.

Description

[Technical field]

[0001] The present invention relates to an interlayer film for laminated glass used to obtain laminated glass. The present invention also relates to laminated glass using the interlayer film for laminated glass. [Background technology]

[0002] Laminated glass is excellent in safety because even if it is broken by an external impact, the amount of glass fragments scattered is small. For this reason, laminated glass is widely used in automobiles, railway vehicles, aircraft, ships, buildings, etc. Laminated glass is manufactured by sandwiching an interlayer film between a pair of glass sheets.

[0003] In recent years, laminated glass having design properties, light blocking properties, privacy protection properties, etc., has been required as laminated glass for buildings and automobiles. Laminated glass having design properties, light blocking properties, privacy protection properties, etc. can be obtained by using an interlayer film containing a colorant such as a dye or a pigment.

[0004] The following Patent Document 1 discloses a laminated glass for vehicles in which two glass sheets are bonded to each other via an interlayer film. The interlayer film includes a first region provided with a dimming function that imparts a transmittance loss for visible light, and a second region surrounded by the first region or a second region formed by partially receding an end of the first region. In the second region, the interlayer film has a transmittance loss for visible light that is smaller than the transmittance loss. The first region may contain, for example, a pigment or a dye. The first region may be a strip-shaped shade region. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] WO2003 / 059837A1 Summary of the Invention [Problem to be solved by the invention]

[0006] An interlayer film having a colored layer containing a coloring agent is known. The colored layer may be provided as a surface layer of the interlayer film, or may be provided as an intermediate layer embedded inside the interlayer film. An interlayer film having a colored layer generally has a colored region corresponding to the position of the colored layer.

[0007] Furthermore, the interlayer film may be stored in a state where the interlayer film is overlapped, for example, in the form of a roll in which the interlayer film is wound around the outer periphery of a winding core.

[0008] In conventional interlayer films having colored regions, when the interlayer films are stored in a stacked state, the colored regions may come into contact with other parts, causing color transfer at the contacted parts. Note that this color transfer may occur even in interlayer films in which the colored layer is embedded inside.

[0009] An object of the present invention is to provide an interlayer film for laminated glass capable of suppressing color transfer. Another object of the present invention is to provide laminated glass using the interlayer film for laminated glass. [Means for solving the problem]

[0010] According to a broad aspect of the present invention, there is provided an interlayer film for laminated glass (hereinafter sometimes referred to as interlayer film), in which, when an interlayer film is placed between two sheets of clear glass conforming to JIS R3202:1996 to obtain laminated glass X, and the parallel light transmittance of the obtained laminated glass X is measured, the interlayer film has a colored region having a parallel light transmittance of less than 60% and a transparent region having a parallel light transmittance of 60% or more, the average thickness of the interlayer film in the colored region is smaller than the average thickness of the interlayer film in the transparent region, and the absolute value of the difference between the average thickness of the interlayer film in the colored region and the average thickness of the interlayer film in the transparent region is 10 μm or more.

[0011] In a specific aspect of the interlayer film according to the present invention, the colored region has a colored layer having a parallel light transmittance of less than 60%, and the shortest distance between the surface of the interlayer film in the thickness direction and the surface of the colored layer in the thickness direction is 10 μm or more.

[0012] In a specific aspect of the interlayer film according to the present invention, at least one surface in the thickness direction of the interlayer film in the colored region has an uneven shape formed by an embossing roll method, and the maximum value of the ten-point average roughness Rz of the surface having the uneven shape of the interlayer film in the colored region is 9 μm or more.

[0013] According to a broad aspect of the present invention, there is provided laminated glass comprising a first laminated glass component, a second laminated glass component, and the above-mentioned interlayer film for laminated glass, with the interlayer film for laminated glass being disposed between the first laminated glass component and the second laminated glass component.

[0014] According to a broad aspect of the present invention, there is provided laminated glass comprising a first laminated glass component, a second laminated glass component, and an interlayer film for laminated glass, the interlayer film for laminated glass being disposed between the first laminated glass component and the second laminated glass component, and when the parallel light transmittance of the laminated glass is measured, the laminated glass has a colored region having a parallel light transmittance of less than 60% and a transparent region having a parallel light transmittance of 60% or more, the average thickness of the interlayer film in the colored region is smaller than the average thickness of the interlayer film in the transparent region, and the absolute value of the difference between the average thickness of the interlayer film in the colored region and the average thickness of the interlayer film in the transparent region is 10 μm or more. Effect of the Invention

[0015] When the interlayer film according to the present invention is placed between two pieces of clear glass conforming to JIS R3202:1996 to obtain laminated glass X, and the parallel light transmittance of the obtained laminated glass X is measured, the interlayer film has a colored region having a parallel light transmittance of less than 60% and a transparent region having a parallel light transmittance of 60% or more. In the interlayer film according to the present invention, the average thickness of the interlayer film in the colored region is smaller than the average thickness of the interlayer film in the transparent region, and the absolute value of the difference between the average thickness of the interlayer film in the colored region and the average thickness of the interlayer film in the transparent region is 10 μm or more. Since the interlayer film according to the present invention has the above configuration, it is possible to suppress color transfer.

[0016] The laminated glass according to the present invention comprises a first laminated glass member, a second laminated glass member, and an interlayer film for laminated glass. The laminated glass according to the present invention has the interlayer film for laminated glass disposed between the first laminated glass member and the second laminated glass member. When the parallel light transmittance of the laminated glass according to the present invention is measured, the laminated glass has a colored region having a parallel light transmittance of less than 60% and a transparent region having a parallel light transmittance of 60% or more. In the laminated glass according to the present invention, the average thickness of the interlayer film in the colored region is smaller than the average thickness of the interlayer film in the transparent region, and the absolute value of the difference between the average thickness of the interlayer film in the colored region and the average thickness of the interlayer film in the transparent region is 10 μm or more. Since the laminated glass according to the present invention has the above configuration, it is possible to suppress color transfer of the interlayer film used in the laminated glass. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a cross-sectional view that illustrates a schematic diagram of an interlayer film for laminated glass according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view that illustrates a schematic diagram of an interlayer film for laminated glass according to a second embodiment of the present invention. [Diagram 3] FIG. 3 is a cross-sectional view that illustrates an interlayer film for laminated glass according to a third embodiment of the present invention. [Figure 4] FIG. 4(a) is a perspective view showing a schematic diagram of a roll around which the interlayer film for laminated glass shown in FIG. 1 is wound, and FIG. 4(b) is an enlarged cross-sectional view showing a laminated portion of the interlayer film for laminated glass in the roll. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The present invention will be described in detail below.

[0019] (Interlayer film for laminated glass) The interlayer film for laminated glass according to the present invention (sometimes abbreviated as "interlayer film" in this specification) is used for laminated glass. When the interlayer film according to the present invention is placed between two sheets of clear glass conforming to JIS R3202:1996 to obtain laminated glass X, and the parallel light transmittance of the obtained laminated glass X is measured, the interlayer film has a colored region having a parallel light transmittance of less than 60% and a transparent region having a parallel light transmittance of 60% or more. In the interlayer film according to the present invention, the average thickness of the interlayer film in the colored region is smaller than the average thickness of the interlayer film in the transparent region, and the absolute value of the difference between the average thickness of the interlayer film in the colored region and the average thickness of the interlayer film in the transparent region is 10 μm or more.

[0020] The interlayer film according to the present invention has the above-mentioned configuration, and therefore can suppress color transfer. Even if the interlayer film according to the present invention is stored in a stacked state, such as in a roll, the colored region is unlikely to come into contact with other parts. Therefore, the interlayer film according to the present invention can suppress color transfer. Therefore, by using the interlayer film according to the present invention, laminated glass with a good appearance can be obtained.

[0021] The intermediate film has a one-layer structure or a two-layer or more structure. The intermediate film may have a one-layer structure or a two-layer or more structure. The intermediate film may have a two-layer structure, a three-layer structure, a three-layer structure, a four-layer structure, a five-layer structure, or a six-layer structure. The intermediate film may be an intermediate film having a one-layer structure including only a first layer (single-layer intermediate film), or an intermediate film having a two-layer or more structure including a first layer and another layer (multilayer intermediate film). The intermediate film may have these structures in a part of the intermediate film, or in the entire intermediate film. The structure of the intermediate film may be partially different.

[0022] In the present invention, the interlayer film is disposed between two sheets of clear glass conforming to JIS R3202:1996 to obtain laminated glass X. The laminated glass X is preferably produced as follows.

[0023] An interlayer film is sandwiched between two sheets of 2 mm thick clear glass conforming to JIS R3202:1996 to obtain a laminate. The obtained laminate is placed in a rubber bag and degassed for 20 minutes at a vacuum of 2.6 kPa, and then transferred to an oven in the degassed state and held at 90°C for an additional 30 minutes to perform vacuum pressing to pre-bond the laminate. The pre-bonded laminate is then pressed for 20 minutes in an autoclave at 135°C and a pressure of 1.2 MPa to obtain laminated glass X.

[0024] In the present invention, when the parallel light transmittance of the obtained laminated glass X is measured, the interlayer has a colored region having a parallel light transmittance of less than 60% and a transparent region having a parallel light transmittance of 60% or more. The interlayer may have the colored region at one end in the width direction, and the transparent region at the other end opposite to the one end in the width direction. In addition, in the colored region, a colored layer having a parallel light transmittance of less than 60% and a layer other than the colored layer (a layer having a parallel light transmittance of 60% or more) may be present in the thickness direction of the interlayer. In this case, the colored region includes the colored layer and the layer other than the colored layer (for example, the left part of the broken line in Figures 1 to 3). The colored region of the interlayer having a parallel light transmittance of less than 60% corresponds to the colored region of the laminated glass X having a parallel light transmittance of less than 60%. The transparent region of the interlayer having a parallel light transmittance of 60% or more corresponds to the transparent region of the laminated glass X having a parallel light transmittance of 60% or more.

[0025] The parallel light transmittance is measured in accordance with JIS R3106:1998. Specifically, it is measured as follows. It is preferable that one end of the interlayer film is one end of the laminated glass X, and the other end of the interlayer film is the other end of the laminated glass X.

[0026] Using a spectrophotometer, the laminated glass X is placed on the optical path between the light source and the integrating sphere, parallel to the normal to the optical axis, at a point 13 cm away from the integrating sphere, so that only the transmitted parallel light is received by the integrating sphere. The parallel light transmittance means the visible light transmittance calculated from the spectral transmittance measured in this state. An example of the spectrophotometer is the "U-4100" manufactured by Hitachi High-Tech Corporation.

[0027] The intermediate film preferably includes a plurality of layers at one end side in the width direction. The intermediate film preferably includes a plurality of layers in the colored region. In this case, the intermediate film may include a colored layer containing a colorant and a layer other than the colored layer in the colored region.

[0028] FIG. 1 is a cross-sectional view that illustrates a schematic diagram of an interlayer film for laminated glass according to a first embodiment of the present invention.

[0029] The interlayer film 11 shown in Fig. 1 is used to obtain laminated glass. The interlayer film 11 is an interlayer film for laminated glass.

[0030] The interlayer film 11 includes a first layer 1, a second layer 2, and a third layer 3. The second layer 2 is disposed on the first surface (one side) of the first layer 1. The second layer 2 is laminated on the first surface of the first layer 1. The first layer 1 and the second layer 2 are in contact with each other. The third layer 3 is disposed on the second surface side of the first layer 1, opposite to the first surface. The third layer 3 is laminated on the second surface of the first layer 1. The first layer 1 and the third layer 3 are in contact with each other. The first layer 1 is disposed and sandwiched between the second layer 2 and the third layer 3. The first layer 1, the second layer 2, and the third layer 3 each have a parallel light transmittance of 60% or more. The interlayer film 11 has a multilayer structure except for the colored layer.

[0031] The intermediate film 11 has a length direction and a width direction. The left-right direction in FIG.

[0032] The intermediate film 11 has a colored layer 4 (fourth layer) having a parallel light transmittance of less than 60%. The colored layer 4 contains a colorant. The colored layer 4 is embedded in the second layer 2. At one end side of the intermediate film 11, the colored layer 4 is embedded in the second layer 2. At one end side of the intermediate film 11 in the width direction, the colored layer 4 is embedded in the second layer 2.

[0033] The intermediate film 11 has a colored region X having a parallel light transmittance of less than 60% in a portion having the colored layer 4. The colored region X is, for example, a region that is colored when the intermediate film 11 is viewed in a plan view. The intermediate film 11 has a transparent region Y having a parallel light transmittance of 60% or more in a portion not having the colored layer 4. The transparent region Y is, for example, a region that is not colored when the intermediate film 11 is viewed in a plan view. The entire portion to the left of the dashed line in FIG. 1 is referred to as the colored region X. The entire portion to the right of the dashed line in FIG. 1 is referred to as the transparent region Y.

[0034] The interlayer film 11 has a multilayer structure in which a second layer 2, a colored layer 4, a second layer 2, a first layer 1, and a third layer 3 are arranged in this order in the colored region X. The interlayer film 11 has a five-layer structure in the colored region X.

[0035] A transparent region Y is located on the other end side of the interlayer 11. The transparent region Y is located closer to the other end side of the interlayer 11 than the colored region X. The interlayer 11 has a multilayer structure in the transparent region Y in which a second layer 2, a first layer 1, and a third layer 3 are arranged side by side in this order. The interlayer 11 has a three-layer structure in the transparent region Y.

[0036] The colored region X is located on one end side of the intermediate film 11. The colored region X is located closer to one end side of the intermediate film 11 than the transparent region Y. The thickness of the colored layer 4 decreases from one end side to the other end side in the width direction of the intermediate film 11. Therefore, in the intermediate film 11, the parallel light transmittance increases in the colored region X from one end side to the other end side in the width direction.

[0037] The average thickness of the first layer 1 in the colored region X is the same as the average thickness of the first layer 1 in the transparent region Y. The average thickness of the second layer 2 in the colored region X is different from the average thickness of the second layer 2 in the transparent region Y. The average thickness of the second layer 2 in the colored region X is smaller than the average thickness of the second layer 2 in the transparent region Y. The average thickness of the third layer 3 in the colored region X is the same as the average thickness of the third layer 3 in the transparent region Y.

[0038] In the interlayer 11, the average thickness of the interlayer 11 in the colored region X is smaller than the average thickness of the interlayer 11 in the transparent region Y.

[0039] The outer surface of the second layer 2 opposite to the first layer 1 is preferably a surface on which a laminated glass member is laminated. The outer surface of the third layer 3 opposite to the first layer 1 is preferably a surface on which a laminated glass member is laminated.

[0040] Fig. 4(a) is a perspective view showing a schematic diagram of a roll around which the interlayer film for laminated glass shown in Fig. 1 is wound, and Fig. 4(b) is an enlarged cross-sectional view showing a laminated portion of the interlayer film for laminated glass in the roll. Fig. 4(b) is a cross-sectional view taken along line II in Fig. 4(a).

[0041] As shown in FIG. 4( a ), the interlayer film 11 may be wound into a roll 51 of the interlayer film 11 .

[0042] The roll body 51 includes a winding core 61 and an intermediate film 11. The intermediate film 11 is wound around the outer periphery of the winding core 61.

[0043] 4(b) shows an enlarged view of a portion of the intermediate film 11 wound three times. Even when the intermediate film 11 is wound into a roll body 51, the colored regions X are unlikely to come into contact with each other, and gaps exist between the colored regions X. This makes it possible to prevent color transfer. Even if the colored regions X come into contact with each other, the colored regions X are unlikely to adhere firmly to each other, making it possible to prevent color transfer.

[0044] FIG. 2 is a cross-sectional view that illustrates a schematic diagram of an interlayer film for laminated glass according to a second embodiment of the present invention.

[0045] The interlayer film 11A shown in Fig. 2 is used to obtain laminated glass. The interlayer film 11A is an interlayer film for laminated glass. The interlayer film 11A has a single-layer structure excluding the colored layer.

[0046] The intermediate film 11A includes a first layer 1A. The first layer 1A is a layer having a parallel light transmittance of 60% or more.

[0047] The intermediate film 11A has a length direction and a width direction. The left-right direction in FIG.

[0048] The intermediate film 11A includes a colored layer 4A (the second layer, or the fourth layer when the second layer and the third layer are omitted layers) having a parallel light transmittance of less than 60%. The colored layer 4A contains a colorant. The colored layer 4A is embedded in the first layer 1A. On one end side of the intermediate film 11A, the colored layer 4A is embedded in the first layer 1A.

[0049] The intermediate film 11A has a colored region X having a parallel light transmittance of less than 60% in a portion having the colored layer 4A. The colored region X is, for example, a region that is colored when the intermediate film 11A is viewed in a plan view. The intermediate film 11A has a transparent region Y having a parallel light transmittance of 60% or more in a portion not having the colored layer 4A. The transparent region Y is, for example, a region that is not colored when the intermediate film 11A is viewed in a plan view. The entire portion to the left of the dashed line in FIG. 2 is referred to as the colored region X. The entire portion to the right of the dashed line in FIG. 2 is referred to as the transparent region Y.

[0050] The intermediate film 11A has a multilayer structure in which a first layer 1A, a colored layer 4A, and a first layer 1A are arranged in this order in the colored region X. The intermediate film 11A has a three-layer structure in the colored region X.

[0051] A colored region X is located on one end side of the intermediate film 11A. The colored region X is located closer to one end side of the intermediate film 11A than the transparent region Y. The intermediate film 11A has a single-layer structure in the transparent region Y.

[0052] A colored region X is located on one end side of the intermediate film 11A. The colored region X is located closer to one end side of the intermediate film 11A than the transparent region Y. The thickness of the colored layer 4A decreases from one end side to the other end side in the width direction of the intermediate film 11A. Therefore, in the intermediate film 11A, the parallel light transmittance increases in the colored region X from one end side to the other end side in the width direction.

[0053] The average thickness of the first layer 1A in the colored region X is different from the average thickness of the first layer 1A in the transparent region Y. The average thickness of the first layer 1A in the colored region X is smaller than the average thickness of the first layer 1A in the transparent region Y.

[0054] The average thickness of the intermediate film 11A in the colored region X is smaller than the average thickness of the intermediate film 11A in the transparent region Y.

[0055] FIG. 3 is a cross-sectional view that illustrates an interlayer film for laminated glass according to a third embodiment of the present invention.

[0056] The interlayer film 11B shown in Fig. 3 is used to obtain laminated glass. The interlayer film 11B is an interlayer film for laminated glass.

[0057] The intermediate film 11 shown in FIG. 1 and the intermediate film 11B shown in FIG. 3 are different in the thickness of the second layer and the shape of the third layer in the colored region.

[0058] The intermediate film 11B includes a first layer 1B, a second layer 2B, and a third layer 3B. The first layer 1B, the second layer 2B, and the third layer 3B each have a parallel light transmittance of 60% or more. The intermediate film 11B has a multilayer structure except for the colored layer.

[0059] The intermediate film 11B has a length direction and a width direction. The left-right direction in FIG.

[0060] The intermediate film 11B has a colored layer 4B (fourth layer) having a parallel light transmittance of less than 60%. The colored layer 4B contains a colorant. The colored layer 4B is embedded in the second layer 2B. At one end side of the intermediate film 11B, the colored layer 4B is embedded in the second layer 2B. At one end side of the intermediate film 11B in the width direction, the colored layer 4B is embedded in the second layer 2B.

[0061] The intermediate film 11B has a colored region X having a parallel light transmittance of less than 60% in a portion having the colored layer 4B. The colored region X is, for example, a region that is colored when the intermediate film 11B is viewed in a plan view. The intermediate film 11B has a transparent region Y having a parallel light transmittance of 60% or more in a portion not having the colored layer 4B. The transparent region Y is, for example, a region that is not colored when the intermediate film 11B is viewed in a plan view. The entire portion to the left of the dashed line in FIG. 3 is referred to as the colored region X. The entire portion to the right of the dashed line in FIG. 3 is referred to as the transparent region Y.

[0062] The average thickness of the first layer 1B in the colored region X is the same as the average thickness of the first layer 1B in the transparent region Y, but these average thicknesses may be different. The average thickness of the second layer 2B in the colored region X is different from the average thickness of the second layer 2B in the transparent region Y, and the average thickness of the second layer 2B in the colored region X is smaller than the average thickness of the second layer 2B in the transparent region Y, but these average thicknesses may be the same. The average thickness of the third layer 3B in the colored region X is different from the average thickness of the third layer 3B in the transparent region Y, and the average thickness of the third layer 3B in the colored region X is smaller than the average thickness of the third layer 3B in the transparent region Y, but these average thicknesses may be the same.

[0063] In the intermediate film 11B, the average thickness in the colored region X of the intermediate film 11B is smaller than the average thickness in the transparent region Y of the intermediate film 11B.

[0064] The layer having a different average thickness between the colored region X and the transparent region X may be a first layer, a second layer, or a third layer. The number of layers having a different average thickness between the colored region X and the transparent region X may be one layer, two layers, two or more layers, three layers, three or more layers, or all layers. The number of layers having a different average thickness between the colored region X and the transparent region X may be three or less layers, or two or less layers. The shape of the colored region X and the transparent region X that makes the average thickness different is not particularly limited.

[0065] In the interlayer film, another layer may be disposed between the first layer and the second layer, and between the first layer and the third layer. In the interlayer film, it is preferable that the first layer and the second layer, and the first layer and the third layer are directly laminated to each other.

[0066] The interlayer film may have only one color layer or may have multiple color layers. The color layer may be embedded in the first layer, may be disposed between the first layer and the second layer, may be disposed on the side of the second layer opposite to the first layer side, may be embedded in the third layer, may be disposed between the first layer and the third layer, or may be disposed on the side of the third layer opposite to the first layer side. The color layer may be located on the surface of the interlayer film.

[0067] The thickness of the colored layer may be smaller, larger, or uniform from one end side to the other end side in the width direction of the intermediate film. In the intermediate film, the parallel light transmittance may be constant or may change from one end side to the other end side in the width direction in the colored region X. In the intermediate film, the parallel light transmittance may be larger or smaller from one end side to the other end side in the width direction in the colored region X. In addition, in the intermediate film, the parallel light transmittance in the colored region X may change due to a change in the concentration of the colorant contained in the colored layer. For example, in the intermediate film, the concentration of the colorant contained in the colored layer may be thinner from one end side to the other end side in the width direction of the intermediate film, so that the parallel light transmittance in the colored region X may be larger from the one end side to the other end side.

[0068] The average thickness of the interlayer film in the colored region is defined as the "average thickness of the interlayer film (X)," and the average thickness of the interlayer film in the transparent region is defined as the "average thickness of the interlayer film (Y)." From the viewpoint of exerting the effects of the present invention, the average thickness of the interlayer film (X) is smaller than the average thickness of the interlayer film (Y). Furthermore, from the viewpoint of exerting the effects of the present invention, the absolute value of the difference between the average thickness of the interlayer film (X) and the average thickness of the interlayer film (Y) is 10 μm or more.

[0069] The absolute value of the difference between the average thickness (X) of the interlayer film and the average thickness (Y) of the interlayer film is preferably 15 μm or more, more preferably 20 μm or more, even more preferably 25 μm or more, even more preferably 30 μm or more, even more preferably 50 μm or more, particularly preferably 75 μm or more, and most preferably 100 μm or more. The absolute value of the difference between the average thickness (X) of the interlayer film and the average thickness (Y) of the interlayer film is preferably 1500 μm or less, more preferably 1200 μm or less, even more preferably 900 μm or less, and particularly preferably 600 μm or less. When the absolute value of the difference is the lower limit or more, the effects of the present invention can be more effectively exhibited. When the absolute value of the difference is the upper limit or less, the production efficiency of the interlayer film can be improved.

[0070] The colored region preferably has a colored layer having a parallel light transmittance of less than 60%. The parallel light transmittance of the colored layer can be measured in the same manner as described above by peeling the colored layer from the interlayer or molding a composition for forming the colored layer to obtain a colored layer, and using the obtained colored layer. When the colored layer is placed between two clear glasses conforming to JIS R3202:1996 to obtain laminated glass Y, and the parallel light transmittance of the obtained laminated glass Y is measured, the colored layer preferably has a parallel light transmittance of less than 60%. A colored layer having a parallel light transmittance of less than 60% corresponds to laminated glass Y having a parallel light transmittance of 60%. The laminated glass Y can be produced in the same manner as the laminated glass X, except that a colored layer is used instead of the interlayer.

[0071] The average thickness of the first layer in the colored region is the "average thickness of the first layer (X1)" and the average thickness of the first layer in the transparent region is the "average thickness of the first layer (Y1)". The average thickness of the second layer in the colored region is the "average thickness of the second layer (X2)" and the average thickness of the second layer in the transparent region is the "average thickness of the second layer (Y2)". The average thickness of the third layer in the colored region is the "average thickness of the third layer (X3)" and the average thickness of the third layer in the transparent region is the "average thickness of the third layer (Y3)". The average thickness of the colored layer in the colored region is the "average thickness of the colored layer (X4)".

[0072] The ratio of the average thickness (X1) of the first layer to the average thickness (X) of the interlayer is defined as the ratio (average thickness (X1) of the first layer / average thickness (X) of the interlayer). The ratio (average thickness (X1) of the first layer / average thickness (X) of the interlayer) is preferably 0.035 or more, more preferably 0.0625 or more, even more preferably 0.1 or more, and is preferably 0.4 or less, more preferably 0.375 or less, even more preferably 0.25 or less, and particularly preferably 0.15 or less. When the ratio (average thickness (X1) of the first layer / average thickness (X) of the interlayer) is 0.4 or less, the rigidity such as bending rigidity becomes even better.

[0073] The ratio of the average thickness (Y1) of the first layer to the average thickness (Y) of the interlayer is defined as the ratio (average thickness (Y1) of the first layer / average thickness (Y) of the interlayer). The ratio (average thickness (Y1) of the first layer / average thickness (Y) of the interlayer) is preferably 0.035 or more, more preferably 0.0625 or more, even more preferably 0.1 or more, and is preferably 0.4 or less, more preferably 0.375 or less, even more preferably 0.25 or less, and particularly preferably 0.15 or less. When the ratio (average thickness (Y1) of the first layer / average thickness (Y) of the interlayer) is 0.4 or less, the rigidity such as bending rigidity becomes even better.

[0074] The ratio of the average thickness (X2) of the second layer to the average thickness (X) of the interlayer (average thickness (X2) of the second layer / average thickness (X) of the interlayer) is preferably 0.3 or more, more preferably 0.3125 or more, even more preferably 0.375 or more, and is preferably 0.97 or less, more preferably 0.9375 or less, even more preferably 0.9 or less. The ratio (average thickness (X2) of the second layer / average thickness (X) of the interlayer) may be 0.46875 or less, or may be 0.45 or less. When the ratio (average thickness (X2) of the second layer / average thickness (X) of the interlayer) is equal to or more than the lower limit and equal to or less than the upper limit, the rigidity and sound insulation of the laminated glass are further increased.

[0075] The ratio of the average thickness (Y2) of the second layer to the average thickness (Y) of the interlayer (average thickness (Y2) of the second layer / average thickness (Y) of the interlayer) is preferably 0.3 or more, more preferably 0.3125 or more, even more preferably 0.375 or more, and is preferably 0.97 or less, more preferably 0.9375 or less, even more preferably 0.9 or less. The ratio (average thickness (Y2) of the second layer / average thickness (Y) of the interlayer) may be 0.46875 or less, or may be 0.45 or less. When the ratio (average thickness (Y2) of the second layer / average thickness (Y) of the interlayer) is equal to or more than the lower limit and equal to or less than the upper limit, the rigidity and sound insulation of the laminated glass are further increased.

[0076] The ratio of the average thickness (X3) of the third layer to the average thickness (X) of the interlayer (average thickness (X3) of the third layer / average thickness (X) of the interlayer) is preferably 0.3 or more, more preferably 0.3125 or more, even more preferably 0.375 or more, and is preferably 0.97 or less, more preferably 0.9375 or less, even more preferably 0.9 or less. The ratio (average thickness (X3) of the third layer / average thickness (X) of the interlayer) may be 0.46875 or less, or may be 0.45 or less. When the ratio (average thickness (X3) of the third layer / average thickness (X) of the interlayer) is equal to or more than the lower limit and equal to or less than the upper limit, the rigidity and sound insulation of the laminated glass are further increased.

[0077] The ratio of the average thickness (Y3) of the third layer to the average thickness (Y) of the interlayer (average thickness (Y3) of the third layer / average thickness (Y) of the interlayer) is preferably 0.3 or more, more preferably 0.3125 or more, even more preferably 0.375 or more, and is preferably 0.97 or less, more preferably 0.9375 or less, even more preferably 0.9 or less. The ratio (average thickness (Y3) of the third layer / average thickness (Y) of the interlayer) may be 0.46875 or less, or may be 0.45 or less. When the ratio (average thickness (Y3) of the third layer / average thickness (Y) of the interlayer) is equal to or more than the lower limit and equal to or less than the upper limit, the rigidity and sound insulation of the laminated glass are further increased.

[0078] The ratio of the average thickness (X4) of the colored layer to the average thickness (X) of the interlayer (average thickness (X4) of the colored layer / average thickness (X) of the interlayer) is preferably 0.01 or more, more preferably 0.02 or more, even more preferably 0.03 or more, particularly preferably 0.04 or more, and is preferably 0.99 or less, more preferably 0.98 or less, and even more preferably 0.97 or less.

[0079] The thickness of the intermediate film can be measured using a measuring device such as a contact type thickness measuring device "TOF-4R" (manufactured by Yamabun Denki Co., Ltd.).

[0080] The thickness is measured using the above-mentioned measuring device at a membrane transport speed of 2.15 mm / min to 2.25 mm / min over the shortest distance from one end to the other end.

[0081] An example of a measuring device used to measure the thickness of the interlayer film after it has been formed into laminated glass is the non-contact multilayer thickness measuring device "OPTIGAUGE" (manufactured by Lumetrics, Inc.) By using this measuring device, the thickness of the interlayer film can be measured in the form of laminated glass.

[0082] The shortest distance between the surface of the interlayer in the thickness direction and the surface of the colored layer in the thickness direction is preferably 10 μm or more, more preferably 20 μm or more, and is preferably 3000 μm or less, more preferably 2990 μm or less. When the shortest distance is equal to or more than the lower limit and equal to or less than the upper limit, the effects of the present invention can be more effectively exhibited.

[0083] The dimension of the colored region in the width direction of the interlayer is preferably 30 mm or more, more preferably 50 mm or more, even more preferably 70 mm or more, particularly preferably 100 mm or more, and is preferably 1500 mm or less, more preferably 1300 mm or less, even more preferably 1000 mm or less, particularly preferably 800 mm or less.

[0084] The ratio of the dimension of the colored region in the width direction of the interlayer film to the dimension in the width direction of the interlayer film (dimension of the colored region in the width direction of the interlayer film / dimension in the width direction of the interlayer film) is preferably 0.03 or more, more preferably 0.05 or more, and preferably 0.9 or less, more preferably 0.85 or less. The ratio (dimension of the colored region in the width direction of the interlayer film / dimension in the width direction of the interlayer film) may be 0.6 or less, 0.5 or less, 0.4 or less, or 0.3 or less.

[0085] Materials that can be used for the interlayer film according to the present invention will be described in detail below.

[0086] (thermoplastic resin) The intermediate film preferably contains a thermoplastic resin (hereinafter, may be referred to as thermoplastic resin (0)). The intermediate film preferably contains a polyvinyl acetal resin (hereinafter, may be referred to as polyvinyl acetal resin (0)) as the thermoplastic resin (0). The first layer preferably contains a thermoplastic resin (hereinafter, may be referred to as thermoplastic resin (1)). The first layer preferably contains a polyvinyl acetal resin (hereinafter, may be referred to as polyvinyl acetal resin (1)) as the thermoplastic resin (1). The second layer preferably contains a thermoplastic resin (hereinafter, may be referred to as thermoplastic resin (2)). The second layer preferably contains a polyvinyl acetal resin (hereinafter, may be referred to as polyvinyl acetal resin (2)) as the thermoplastic resin (2). The third layer preferably contains a thermoplastic resin (hereinafter, may be referred to as thermoplastic resin (3)). The third layer preferably contains a polyvinyl acetal resin (hereinafter, may be referred to as polyvinyl acetal resin (3)) as the thermoplastic resin (3). The colored layer preferably contains a thermoplastic resin (hereinafter, may be referred to as thermoplastic resin (4)). The colored layer preferably contains a polyvinyl acetal resin (hereinafter, may be referred to as polyvinyl acetal resin (4)) as the thermoplastic resin (4). The thermoplastic resin (1), the thermoplastic resin (2), the thermoplastic resin (3), and the thermoplastic resin (4) may be the same or different. Since sound insulation is further improved, it is preferable that the thermoplastic resin (1) is different from the thermoplastic resin (2) and the thermoplastic resin (3). The polyvinyl acetal resin (1), the polyvinyl acetal resin (2), the polyvinyl acetal resin (3), and the polyvinyl acetal resin (4) may be the same or different. Since the sound insulation property is further improved, it is preferable that the polyvinyl acetal resin (1) is different from the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3).The thermoplastic resin (0), the thermoplastic resin (1), the thermoplastic resin (2), the thermoplastic resin (3), and the thermoplastic resin (4) may each be used alone or in combination of two or more thereof. The polyvinyl acetal resin (0), the polyvinyl acetal resin (1), the polyvinyl acetal resin (2), the polyvinyl acetal resin (3), and the polyvinyl acetal resin (4) may each be used alone or in combination of two or more thereof.

[0087] Examples of the thermoplastic resin include polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, polyurethane resin, ionomer resin, polyvinyl alcohol resin, etc. Thermoplastic resins other than these may also be used.

[0088] The polyvinyl acetal resin can be produced, for example, by acetalizing polyvinyl alcohol (PVA) with an aldehyde. The polyvinyl acetal resin is preferably an acetalized product of polyvinyl alcohol. The polyvinyl alcohol can be obtained, for example, by saponifying polyvinyl acetate. The degree of saponification of the polyvinyl alcohol is generally within the range of 70 mol% to 99.9 mol%.

[0089] The average degree of polymerization of the polyvinyl alcohol (PVA) is preferably 200 or more, more preferably 500 or more, even more preferably 1500 or more, even more preferably 1600 or more, particularly preferably 2600 or more, and most preferably 2700 or more, and is preferably 5000 or less, more preferably 4000 or less, and even more preferably 3500 or less. When the average degree of polymerization is equal to or more than the lower limit, the penetration resistance of the laminated glass is further improved. When the average degree of polymerization is equal to or less than the upper limit, the interlayer film is easily formed.

[0090] The average degree of polymerization of the polyvinyl alcohol is determined by a method in accordance with JIS K6726 "Testing method for polyvinyl alcohol."

[0091] The number of carbon atoms of the acetal group contained in the polyvinyl acetal resin is not particularly limited. The aldehyde used in producing the polyvinyl acetal resin is not particularly limited. The number of carbon atoms of the acetal group in the polyvinyl acetal resin is preferably 3 to 5, more preferably 3 or 4. When the number of carbon atoms of the acetal group in the polyvinyl acetal resin is 3 or more, the glass transition temperature of the interlayer film becomes sufficiently low. The number of carbon atoms of the acetal group in the polyvinyl acetal resin may be 4 or 5.

[0092] The aldehyde is not particularly limited. In general, an aldehyde having 1 to 10 carbon atoms is preferably used. Examples of the aldehyde having 1 to 10 carbon atoms include propionaldehyde, n-butylaldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexylaldehyde, n-octylaldehyde, n-nonylaldehyde, n-decylaldehyde, formaldehyde, acetaldehyde, and benzaldehyde. The aldehyde is preferably propionaldehyde, n-butylaldehyde, isobutyraldehyde, n-hexylaldehyde, or n-valeraldehyde, more preferably propionaldehyde, n-butylaldehyde, or isobutyraldehyde, and even more preferably n-butylaldehyde. The aldehydes may be used alone or in combination of two or more.

[0093] The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (0) is preferably 15 mol% or more, more preferably 18 mol% or more, and preferably 40 mol% or less, more preferably 35 mol% or less. When the hydroxyl group content is equal to or more than the lower limit, the adhesive strength of the interlayer film is further increased. When the hydroxyl group content is equal to or less than the upper limit, the flexibility of the interlayer film is increased, making it easier to handle.

[0094] The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (1) is preferably 17 mol% or more, more preferably 20 mol% or more, even more preferably 22 mol% or more, and preferably 28 mol% or less, more preferably 27 mol% or less, even more preferably 25 mol% or less, and particularly preferably 24 mol% or less. When the hydroxyl group content is equal to or more than the lower limit, the mechanical strength of the interlayer film is further increased. In particular, when the hydroxyl group content of the polyvinyl acetal resin (1) is 20 mol% or more, the reaction efficiency is high and the productivity is excellent, and when it is 28 mol% or less, the sound insulation of the laminated glass is further increased. In addition, when the hydroxyl group content is equal to or less than the upper limit, the flexibility of the interlayer film is high, and the handling of the interlayer film is easy.

[0095] When the colored layer is embedded in the first layer, the preferred range of the hydroxyl content of the polyvinyl acetal resin (4) is the same as the preferred range of the hydroxyl content of the polyvinyl acetal resin (1). When the colored layer is not embedded in the second layer or the third layer and is not a surface layer of an interlayer film, the preferred range of the hydroxyl content of the polyvinyl acetal resin (4) is the same as the preferred range of the hydroxyl content of the polyvinyl acetal resin (1).

[0096] The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 25 mol% or more, more preferably 28 mol% or more, even more preferably 30 mol% or more, even more preferably 31.5 mol% or more, particularly preferably 32 mol% or more, and most preferably 33 mol% or more. The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 38 mol% or less, more preferably 37 mol% or less, even more preferably 36.5 mol% or less, and particularly preferably 36 mol% or less. When the hydroxyl group content is the lower limit or more, the adhesive strength of the interlayer film is further increased. Also, when the hydroxyl group content is the upper limit or less, the flexibility of the interlayer film is increased, and the handling of the interlayer film is facilitated.

[0097] When the colored layer is embedded in the second layer or the third layer, the preferred range of the hydroxyl content of the polyvinyl acetal resin (4) is the same as the preferred range of the hydroxyl content of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3). When the colored layer is a surface layer of an interlayer film, the preferred range of the hydroxyl content of the polyvinyl acetal resin (4) is the same as the preferred range of the hydroxyl content of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3).

[0098] From the viewpoint of further improving the sound insulation, the hydroxyl group content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl group content of the polyvinyl acetal resin (2). From the viewpoint of further improving the sound insulation, the hydroxyl group content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl group content of the polyvinyl acetal resin (3). The absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (2) is defined as absolute value A, and the absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (3) is defined as absolute value B. From the viewpoint of further improving the sound insulation, the absolute values ​​A and B are each preferably 1 mol% or more, more preferably 5 mol% or more, even more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. Each of the absolute value A and the absolute value B is preferably 20 mol % or less.

[0099] There are cases where the colored layer is embedded in the first layer, and cases where the colored layer is not embedded in the second layer and the third layer and is not a surface layer of the interlayer. In these cases, from the viewpoint of further improving sound insulation, it is preferable that the hydroxyl group content of the polyvinyl acetal resin (4) is lower than the hydroxyl group content of the polyvinyl acetal resin (2). From the viewpoint of further improving sound insulation, it is preferable that the hydroxyl group content of the polyvinyl acetal resin (4) is lower than the hydroxyl group content of the polyvinyl acetal resin (3). The absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (4) and the hydroxyl group content of the polyvinyl acetal resin (2) is absolute value C, and the absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (4) and the hydroxyl group content of the polyvinyl acetal resin (3) is absolute value D. From the viewpoint of further improving the sound insulation, each of the absolute values ​​C and D is preferably 1 mol% or more, more preferably 5 mol% or more, even more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. Each of the absolute values ​​C and D is preferably 20 mol% or less.

[0100] The colored layer may be embedded in the second layer or the third layer, or may be a surface layer of an intermediate film. In these cases, from the viewpoint of further improving sound insulation, the hydroxyl group content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl group content of the polyvinyl acetal resin (4). From the viewpoint of further improving sound insulation, the absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (4) is preferably 1 mol% or more, more preferably 5 mol% or more, even more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. The absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (4) is preferably 20 mol% or less.

[0101] The hydroxyl content of the polyvinyl acetal resin is a molar fraction calculated by dividing the amount of ethylene groups to which hydroxyl groups are bonded by the total amount of ethylene groups in the main chain, and expressed as a percentage. The amount of ethylene groups to which hydroxyl groups are bonded can be measured, for example, in accordance with JIS K6728 "Testing Methods for Polyvinyl Butyral."

[0102] The degree of acetylation (amount of acetyl groups) of the polyvinyl acetal resin (0) is preferably 0.1 mol% or more, more preferably 0.3 mol% or more, even more preferably 0.5 mol% or more, and is preferably 30 mol% or less, more preferably 25 mol% or less, even more preferably 20 mol% or less. When the degree of acetylation is equal to or more than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is increased. When the degree of acetylation is equal to or less than the upper limit, the moisture resistance of the interlayer film and the laminated glass is increased.

[0103] The degree of acetylation (amount of acetyl groups) of the polyvinyl acetal resin (1) is preferably 0.01 mol% or more, more preferably 0.1 mol% or more, even more preferably 7 mol% or more, even more preferably 9 mol% or more, and preferably 30 mol% or less, more preferably 25 mol% or less, even more preferably 24 mol% or less, and particularly preferably 20 mol% or less. When the degree of acetylation is equal to or more than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is increased. When the degree of acetylation is equal to or less than the upper limit, the moisture resistance of the interlayer film and the laminated glass is increased. In particular, when the degree of acetylation of the polyvinyl acetal resin (1) is 0.1 mol% or more and 25 mol% or less, the penetration resistance is excellent.

[0104] When the colored layer is embedded in the first layer, the preferred range of the acetylation degree of the polyvinyl acetal resin (4) is the same as the preferred range of the acetylation degree of the polyvinyl acetal resin (1). When the colored layer is not embedded in the second layer and the third layer and is not a surface layer of an interlayer film, the preferred range of the acetylation degree of the polyvinyl acetal resin (4) is the same as the preferred range of the acetylation degree of the polyvinyl acetal resin (1).

[0105] The degree of acetylation (amount of acetyl groups) of each of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 0.01 mol% or more, more preferably 0.5 mol% or more, and preferably 10 mol% or less, more preferably 2 mol% or less. When the degree of acetylation is equal to or more than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is increased. When the degree of acetylation is equal to or less than the upper limit, the moisture resistance of the interlayer film and the laminated glass is increased.

[0106] When the colored layer is embedded in the second layer or the third layer, the preferred range of the acetylation degree of the polyvinyl acetal resin (4) is the same as the preferred range of the acetylation degree of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3). When the colored layer is a surface layer of an interlayer film, the preferred range of the acetylation degree of the polyvinyl acetal resin (4) is the same as the preferred range of the acetylation degree of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3).

[0107] The degree of acetylation is a molar fraction calculated by dividing the amount of ethylene groups to which acetyl groups are bonded by the total amount of ethylene groups in the main chain, expressed as a percentage. The amount of ethylene groups to which acetyl groups are bonded can be measured, for example, in accordance with JIS K6728 "Testing Methods for Polyvinyl Butyral."

[0108] The degree of acetalization of the polyvinyl acetal resin (0) (the degree of butyralization in the case of a polyvinyl butyral resin) is preferably 60 mol% or more, more preferably 63 mol% or more, and preferably 85 mol% or less, more preferably 75 mol% or less, and even more preferably 70 mol% or less. When the degree of acetalization is equal to or more than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is increased. When the degree of acetalization is equal to or less than the upper limit, the reaction time required to produce the polyvinyl acetal resin is shortened.

[0109] The degree of acetalization of the polyvinyl acetal resin (1) (the degree of butyralization in the case of a polyvinyl butyral resin) is preferably 47 mol% or more, more preferably 60 mol% or more, and preferably 85 mol% or less, more preferably 80 mol% or less, and even more preferably 75 mol% or less. When the degree of acetalization is equal to or more than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is increased. When the degree of acetalization is equal to or less than the upper limit, the reaction time required to produce the polyvinyl acetal resin is shortened.

[0110] When the colored layer is embedded in the first layer, the preferred range of the acetalization degree of the polyvinyl acetal resin (4) is the same as the preferred range of the acetalization degree of the polyvinyl acetal resin (1). When the colored layer is not embedded in the second layer and the third layer and is not a surface layer of an interlayer film, the preferred range of the acetalization degree of the polyvinyl acetal resin (4) is the same as the preferred range of the acetalization degree of the polyvinyl acetal resin (1).

[0111] The degree of acetalization of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) (the degree of butyralization in the case of a polyvinyl butyral resin) is preferably 55 mol% or more, more preferably 60 mol% or more, and preferably 75 mol% or less, more preferably 71 mol% or less. When the degree of acetalization is equal to or more than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is increased. When the degree of acetalization is equal to or less than the upper limit, the reaction time required to produce the polyvinyl acetal resin is shortened.

[0112] When the colored layer is embedded in the second layer or the third layer, the preferred range of the acetalization degree of the polyvinyl acetal resin (4) is the same as the preferred range of the acetalization degree of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3). When the colored layer is a surface layer of an interlayer film, the preferred range of the acetalization degree of the polyvinyl acetal resin (4) is the same as the preferred range of the acetalization degree of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3).

[0113] The degree of acetalization is determined as follows. First, the amount of ethylene groups to which hydroxyl groups are bonded and the amount of ethylene groups to which acetyl groups are bonded are subtracted from the total amount of ethylene groups in the main chain to determine a value. The obtained value is divided by the total amount of ethylene groups in the main chain to determine a molar fraction. The value expressed as a percentage of this molar fraction is the degree of acetalization.

[0114] The hydroxyl group content (hydroxyl group amount), acetalization degree (butyralization degree), and acetylation degree are preferably calculated from the results measured by a method conforming to JIS K6728 "Testing Method for Polyvinyl Butyral". However, measurements according to ASTM D1396-92 may also be used. When the polyvinyl acetal resin is a polyvinyl butyral resin, the hydroxyl group content (hydroxyl group amount), acetalization degree (butyralization degree), and acetylation degree can be calculated from the results measured by a method conforming to JIS K6728 "Testing Method for Polyvinyl Butyral".

[0115] In 100% by weight of the thermoplastic resin contained in the interlayer, the content of the polyvinyl acetal resin is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, still more preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. The main component (50% by weight or more) of the thermoplastic resin of the interlayer is preferably a polyvinyl acetal resin.

[0116] The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the first layer is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, even more preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the first layer may be 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin of the first layer is preferably a polyvinyl acetal resin.

[0117] The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the second layer is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, even more preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the second layer may be 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin of the second layer is preferably a polyvinyl acetal resin.

[0118] The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the third layer is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, even more preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the third layer may be 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin in the third layer is preferably a polyvinyl acetal resin.

[0119] The content of polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the colored layer is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, even more preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. The content of polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the colored layer may be 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin of the colored layer is preferably polyvinyl acetal resin.

[0120] (Plasticizer) From the viewpoint of further increasing the adhesive strength of the interlayer film, the interlayer film according to the present invention preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (0)). The first layer preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (1)). The second layer preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (2)). The third layer preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (3). The colored layer preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (4)). When the thermoplastic resin contained in the interlayer film is a polyvinyl acetal resin, it is particularly preferable that the interlayer film (each layer) contains a plasticizer. The layer containing a polyvinyl acetal resin preferably contains a plasticizer.

[0121] The plasticizer is not particularly limited. Conventionally known plasticizers can be used as the plasticizer. The plasticizer may be used alone or in combination of two or more.

[0122] Examples of the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, organic phosphoric acid plasticizers, and organic phosphorous acid plasticizers. The plasticizer is preferably an organic ester plasticizer. The plasticizer is preferably a liquid plasticizer.

[0123] The monobasic organic acid ester may be a glycol ester obtained by reacting a glycol with a monobasic organic acid. The glycol may be triethylene glycol, tetraethylene glycol, or tripropylene glycol. The monobasic organic acid may be butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptyl acid, n-octylic acid, 2-ethylhexyl acid, n-nonylic acid, decylic acid, or benzoic acid.

[0124] Examples of the polybasic organic acid ester include ester compounds of a polybasic organic acid and an alcohol having a linear or branched structure with 4 to 8 carbon atoms. Examples of the polybasic organic acid include adipic acid, sebacic acid, and azelaic acid.

[0125] Examples of the organic ester plasticizer include triethylene glycol di-2-ethylpropanoate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dicaprylate, triethylene glycol di-n-octanoate, triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethylbutyrate, 1,3-propylene glycol di-2-ethylbutyrate, 1,4-butylene glycol di-2-ethylbutyrate, diethylene glycol di-2-ethylbutylate, and ethylene glycol di-2-ethylbutylate. ester, diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylpentanoate, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol dicaprylate, diethylene glycol dibenzoate, dipropylene glycol dibenzoate, dihexyl adipate, dioctyl adipate, hexylcyclohexyl adipate, a mixture of heptyl adipate and nonyl adipate, diisononyl adipate, diisodecyl adipate, heptylnonyl adipate, dibutyl sebacate, oil-modified alkyd sebacate, and a mixture of a phosphoric acid ester and an adipic acid ester. As the organic ester plasticizer, organic ester plasticizers other than these may be used. As the adipic acid ester, an adipic acid ester other than the above-mentioned adipic acid ester may be used.

[0126] The organic phosphoric acid plasticizers include tributoxyethyl phosphate, isodecylphenyl phosphate, and triisopropyl phosphate.

[0127] The plasticizer is preferably a diester plasticizer represented by the following formula (1).

[0128] [ka]

[0129] In the above formula (1), R1 and R2 each represent an organic group having 2 to 10 carbon atoms, R3 represents an ethylene group, an isopropylene group or an n-propylene group, and p represents an integer of 3 to 10. In the above formula (1), R1 and R2 each represent an organic group having 5 to 10 carbon atoms, and more preferably an organic group having 6 to 10 carbon atoms.

[0130] The plasticizer preferably includes triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH) or triethylene glycol di-2-ethylpropanoate.The plasticizer more preferably includes triethylene glycol di-2-ethylhexanoate (3GO) or triethylene glycol di-2-ethylbutyrate (3GH), and even more preferably includes triethylene glycol di-2-ethylhexanoate (3GO).

[0131] The content of the plasticizer (0) relative to 100 parts by weight of the thermoplastic resin (0) in the interlayer film is defined as the content (0). The content (0) is preferably 5 parts by weight or more, more preferably 25 parts by weight or more, even more preferably 30 parts by weight or more, and is preferably 100 parts by weight or less, more preferably 60 parts by weight or less, and even more preferably 50 parts by weight or less. When the content (0) is equal to or more than the lower limit, the penetration resistance of the laminated glass is further increased. When the content (0) is equal to or less than the upper limit, the transparency of the interlayer film is further increased.

[0132] In the colored layer, the content of the plasticizer (4) relative to 100 parts by weight of the thermoplastic resin (4) is defined as the content (4). In an interlayer film having a single-layer structure excluding the colored layer, when the colored layer is embedded in the first layer, the preferred range of the content (4) is the same as the preferred range of the content (0).

[0133] In the first layer, the content of the plasticizer (1) relative to 100 parts by weight of the thermoplastic resin (1) is defined as the content (1). The content (1) is preferably 50 parts by weight or more, more preferably 55 parts by weight or more, and even more preferably 60 parts by weight or more. The content (1) is preferably 100 parts by weight or less, more preferably 90 parts by weight or less, even more preferably 85 parts by weight or less, and particularly preferably 80 parts by weight or less. When the content (1) is equal to or more than the lower limit, the flexibility of the interlayer film is increased, and the interlayer film is easy to handle. When the content (1) is equal to or less than the upper limit, the penetration resistance of the laminated glass is further increased.

[0134] In the colored layer, the content of the plasticizer (4) relative to 100 parts by weight of the thermoplastic resin (4) is defined as the content (4). In an interlayer film having a multilayer structure excluding the colored layer, when the colored layer is embedded in the first layer, the preferred range of the content (4) is the same as the preferred range of the content (1). When the colored layer is not embedded in the second layer and the third layer and is not a surface layer of the interlayer film, the preferred range of the content (4) is the same as the preferred range of the content (1).

[0135] In the second layer, the content of the plasticizer (2) relative to 100 parts by weight of the thermoplastic resin (2) is defined as the content (2). In the third layer, the content of the plasticizer (3) relative to 100 parts by weight of the thermoplastic resin (3) is defined as the content (3). The content (2) and the content (3) are each preferably 5 parts by weight or more, more preferably 10 parts by weight or more, even more preferably 15 parts by weight or more, even more preferably 20 parts by weight or more, particularly preferably 24 parts by weight or more, and most preferably 25 parts by weight or more. The content (2) and the content (3) are each preferably 45 parts by weight or less, more preferably 40 parts by weight or less, even more preferably 35 parts by weight or less, particularly preferably 32 parts by weight or less, and most preferably 30 parts by weight or less. When the content (2) and the content (3) are equal to or more than the lower limit, the flexibility of the interlayer film is increased, and the interlayer film is easy to handle. When the content (2) and the content (3) are equal to or less than the upper limit, the penetration resistance of the laminated glass is further improved.

[0136] In the colored layer, the content of the plasticizer (4) relative to 100 parts by weight of the thermoplastic resin (4) is defined as the content (4). In an interlayer film having a multilayer structure excluding the colored layer, when the colored layer is embedded in the second layer or the third layer, the preferred range of the content (4) is the same as the preferred ranges of the content (2) and the content (3). When the colored layer is a surface layer of the interlayer film, the preferred range of the content (4) is the same as the preferred ranges of the content (2) and the content (3).

[0137] In order to improve the sound insulation of the laminated glass, the content (1) is preferably greater than the content (2), and the content (1) is preferably greater than the content (3).

[0138] When the colored layer is embedded in the first layer and when the colored layer is not a surface layer of an interlayer film, in order to enhance the sound insulation of the laminated glass, the content (4) is preferably greater than the content (2), and the content (4) is preferably greater than the content (3).

[0139] When the colored layer is embedded in the second layer or the third layer, and when the colored layer is a surface layer of an interlayer film, the content (1) is preferably greater than the content (4) in order to improve the sound insulation of the laminated glass.

[0140] From the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the content (2) and the content (1) and the absolute value of the difference between the content (3) and the content (1) are each preferably 10 parts by weight or more, more preferably 15 parts by weight or more, and even more preferably 20 parts by weight or more. The absolute value of the difference between the content (2) and the content (1) and the absolute value of the difference between the content (3) and the content (1) are each preferably 80 parts by weight or less, more preferably 75 parts by weight or less, and even more preferably 70 parts by weight or less.

[0141] There are cases where the colored layer is embedded in the first layer, and cases where the colored layer is not embedded in the second layer and the third layer and is not a surface layer of the interlayer. In these cases, from the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the content (2) and the content (4) and the absolute value of the difference between the content (3) and the content (4) are each preferably 10 parts by weight or more, more preferably 15 parts by weight or more, and even more preferably 20 parts by weight or more. The absolute value of the difference between the content (2) and the content (4) and the absolute value of the difference between the content (3) and the content (4) are each preferably 80 parts by weight or less, more preferably 75 parts by weight or less, and even more preferably 70 parts by weight or less.

[0142] When the colored layer is embedded in the second layer or the third layer, and when the colored layer is a surface layer of an interlayer film, from the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the content (4) and the content (1) is preferably 10 parts by weight or more, more preferably 15 parts by weight or more, and even more preferably 20 parts by weight or more. The absolute value of the difference between the content (4) and the content (1) is preferably 80 parts by weight or less, more preferably 75 parts by weight or less, and even more preferably 70 parts by weight or less.

[0143] (Coloring agent) The intermediate film preferably contains a colorant. The colored layer preferably contains a colorant. The colored layer preferably contains a colorant in an amount such that the colored region has a parallel light transmittance of less than 60%. The colored layer more preferably contains a colorant in an amount such that the colored region has a parallel light transmittance of less than 60%. The first layer, the second layer, and the third layer may each contain a colorant in an amount such that the transparent region has a parallel light transmittance of 60% or more. The first layer may contain a colorant in an amount such that the first layer has a parallel light transmittance of 60% or more. The second layer may contain a colorant in an amount such that the second layer has a parallel light transmittance of 60% or more. The third layer may contain a colorant in an amount such that the third layer has a parallel light transmittance of 60% or more.

[0144] Usually, the content of the colorant in 100% by weight of the first layer is less than the content of the colorant in 100% by weight of the colored layer. Usually, the content of the colorant in 100% by weight of the second layer is less than the content of the colorant in 100% by weight of the colored layer. Usually, the content of the colorant in 100% by weight of the third layer is less than the content of the colorant in 100% by weight of the colored layer. The first layer may not contain a colorant. The second layer may not contain a colorant. The third layer may not contain a colorant.

[0145] Examples of the colorant include inorganic particles, pigments, dyes, and the like. The colored layer preferably contains inorganic particles, pigments, or dyes. The colored layer may contain inorganic particles, pigments, or dyes. The first layer, the second layer, and the third layer may not contain inorganic particles, pigments, or dyes, respectively.

[0146] Examples of the inorganic particles include carbon black particles, carbon nanotube particles, graphene particles, iron oxide particles, zinc oxide particles, calcium carbonate particles, alumina particles, kaolin clay particles, calcium silicate particles, magnesium oxide particles, magnesium hydroxide particles, aluminum hydroxide particles, magnesium carbonate particles, talc particles, feldspar powder particles, mica particles, baryte particles, barium carbonate particles, titanium oxide particles, silica particles, glass beads, etc. Only one type of the inorganic particles may be used, or two or more types may be used in combination.

[0147] The inorganic particles preferably include carbon black particles, carbon nanotube particles, graphene particles, calcium carbonate particles, titanium oxide particles, or silica particles, and more preferably calcium carbonate particles. By using these preferable inorganic particles, uneven appearance when light is transmitted is suppressed, and a laminated glass with even better appearance design can be obtained.

[0148] The average particle size of the inorganic particles is preferably 0.01 μm or more, more preferably 0.5 μm or more, and preferably 100 μm or less, more preferably 50 μm or less, and even more preferably 10 μm or less. The average particle size indicates the weight average particle size. The average particle size can be measured by a dynamic light scattering method using a light scattering measuring device with a laser as a light source. An example of the light scattering measuring device is "DLS-6000AL" manufactured by Otsuka Electronics Co., Ltd.

[0149] Examples of the dye include pyrene-based dyes, aminoketone-based dyes, anthraquinone-based dyes, azo-based dyes, etc. The dyes may be used alone or in combination of two or more.

[0150] Examples of the pyrene-based dyes include Solvent Green 5 (CAS 79869-59-3) and Solvent Green 7 (CAS 6358-69-6).

[0151] Examples of the aminoketone dyes include Solvent Yellow 98 (CAS12671-74-8), Solvent Yellow 85 (CAS12271-01-1), Solvent Red 179 (CAS8910-94-5), and Solvent Red 135 (CAS71902-17-5).

[0152] Examples of the anthraquinone dyes include Solvent Yellow 163 (CAS13676091-0), Solvent Red 207 (CAS15958-69-6), Disperse Red 92 (CAS12236-11-2), Solvent Violet 13 (CAS81-48-1), Disperse Violet 31 (CAS6408-72-6), Solvent Blue 97 (CAS61969-44-6), Solvent Blue 45 (CAS37229-23-5), Solvent Blue 104 (CAS116-75-6) and Disperse Blue 214 (CAS104491-84-1).

[0153] Examples of the azo dyes include Solvent Yellow 30 (CAS 3321-10-4), Solvent Red 164 (CAS 70956-30-8), and Disperse Blue 146 (CAS 88650-91-3).

[0154] The pigment may be an organic pigment or an inorganic pigment. The organic pigment may be an organic pigment having a metal atom or an organic pigment not having a metal atom. The pigment may be used alone or in combination of two or more kinds.

[0155] Examples of the organic pigment include a phthalocyanine compound, a quinacridone compound, an azo compound, a pentaphene compound, a perylene compound, an indole compound, and a dioxazine compound.

[0156] Further, examples of colorants include a dark reddish brown mixed pigment obtained by mixing a black pigment (carbon black), a red pigment (CI Pigment red), a blue pigment (CI Pigment blue), and a yellow pigment (CI Pigment yellow).

[0157] (Heat-shielding material) The intermediate film preferably contains a heat-shielding material. The first layer preferably contains a heat-shielding material. The second layer preferably contains a heat-shielding material. The third layer preferably contains a heat-shielding material. The colored layer preferably contains a heat-shielding material. Only one type of the heat-shielding material may be used, or two or more types may be used in combination.

[0158] The heat-shielding material preferably contains at least one component X selected from a phthalocyanine compound, a naphthalocyanine compound, and an anthracyanine compound, or contains heat-shielding particles. In this case, the heat-shielding material may contain both the component X and the heat-shielding particles. The heat-shielding material may correspond to the colorant.

[0159] Ingredient X: The intermediate film preferably contains at least one component X selected from a phthalocyanine compound, a naphthalocyanine compound, and an anthracyanine compound. The first layer preferably contains the component X. The second layer preferably contains the component X. The third layer preferably contains the component X. The colored layer preferably contains the component X. The component X is a heat-shielding material. Only one type of the component X may be used, or two or more types may be used in combination.

[0160] There is no particular limitation on the above-mentioned component X. As the component X, a conventionally known phthalocyanine compound, naphthalocyanine compound, or anthracyanine compound can be used.

[0161] The component X may be phthalocyanine, a derivative of phthalocyanine, naphthalocyanine, a derivative of naphthalocyanine, an anthracyanine, or a derivative of anthracyanine. The phthalocyanine compound and the derivative of phthalocyanine each preferably have a phthalocyanine skeleton. The naphthalocyanine compound and the derivative of naphthalocyanine each preferably have a naphthalocyanine skeleton. The anthracyanine compound and the derivative of anthracyanine each preferably have an anthracyanine skeleton.

[0162] From the viewpoint of further improving the heat insulation properties of the interlayer film and laminated glass, the above-mentioned component X is preferably at least one selected from the group consisting of phthalocyanine, phthalocyanine derivatives, naphthalocyanine and naphthalocyanine derivatives, and more preferably at least one of phthalocyanine and phthalocyanine derivatives.

[0163] From the viewpoint of effectively increasing the heat shielding property and maintaining the visible light transmittance at a higher level for a long period of time, the above component X preferably contains a vanadium atom or a copper atom. The above component X preferably contains a vanadium atom, and also preferably contains a copper atom. The above component X is more preferably at least one of phthalocyanine containing a vanadium atom or a copper atom, and a derivative of phthalocyanine containing a vanadium atom or a copper atom. From the viewpoint of further increasing the heat shielding property of the interlayer film and the laminated glass, the above component X preferably has a structural unit in which an oxygen atom is bonded to a vanadium atom.

[0164] In 100% by weight of the intermediate film or in 100% by weight of the layer containing the component X (first layer, second layer, third layer or colored layer), the content of the component X is preferably 0.001% by weight or more, more preferably 0.005% by weight or more, even more preferably 0.01% by weight or more, and particularly preferably 0.02% by weight or more. In 100% by weight of the intermediate film or in 100% by weight of the layer containing the component X (first layer, second layer, third layer or colored layer), the content of the component X is preferably 0.2% by weight or less, more preferably 0.1% by weight or less, even more preferably 0.05% by weight or less, and particularly preferably 0.04% by weight or less. When the content of the component X is equal to or more than the lower limit and equal to or less than the upper limit, the heat shielding property is sufficiently high and the visible light transmittance is sufficiently high. For example, it is possible to make the visible light transmittance 70% or more.

[0165] Heat shielding particles: The intermediate film preferably contains heat-shielding particles. The first layer preferably contains heat-shielding particles. The second layer preferably contains heat-shielding particles. The third layer preferably contains heat-shielding particles. The colored layer preferably contains heat-shielding particles. The heat-shielding particles are a heat-shielding material. By using the heat-shielding particles, infrared rays (heat rays) can be effectively blocked. Only one type of the heat-shielding particles may be used, or two or more types may be used in combination.

[0166] From the viewpoint of further enhancing the heat shielding property of the laminated glass, the heat shielding particles are more preferably metal oxide particles.The heat shielding particles are preferably particles formed of a metal oxide (metal oxide particles).

[0167] Infrared rays, which have a longer wavelength than visible light (780 nm or longer), have a smaller amount of energy than ultraviolet rays. However, infrared rays have a large thermal effect, and when infrared rays are absorbed by a substance, they are released as heat. For this reason, infrared rays are generally called heat rays. By using the above heat-shielding particles, infrared rays (heat rays) can be effectively blocked. Note that heat-shielding particles refer to particles that can absorb infrared rays.

[0168] Examples of the heat-shielding particles include aluminum-doped tin oxide particles, indium-doped tin oxide particles, antimony-doped tin oxide particles (ATO particles), gallium-doped zinc oxide particles (GZO particles), indium-doped zinc oxide particles (IZO particles), aluminum-doped zinc oxide particles (AZO particles), niobium-doped titanium oxide particles, tungsten oxide particles, tin-doped indium oxide particles (ITO particles), tin-doped zinc oxide particles, silicon-doped zinc oxide particles, and other metal oxide particles, and lanthanum hexaboride (LaB6) particles. Other heat-shielding particles may also be used as the heat-shielding particles. The heat-shielding particles are preferably metal oxide particles because of their high heat-ray shielding function, and more preferably ATO particles, GZO particles, IZO particles, ITO particles, or tungsten oxide particles. In particular, the heat-shielding particles are preferably ITO particles or tungsten oxide particles because of their high heat-ray shielding function and easy availability.

[0169] From the viewpoint of further improving the heat insulating properties of the interlayer film and the laminated glass, the tungsten oxide particles are preferably metal-doped tungsten oxide particles. The "tungsten oxide particles" include metal-doped tungsten oxide particles. Examples of the metal-doped tungsten oxide particles include sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, and rubidium-doped tungsten oxide particles.

[0170] From the viewpoint of further increasing the heat insulating property of the interlayer film and the laminated glass, cesium-doped tungsten oxide particles are particularly preferred. From the viewpoint of further increasing the heat insulating property of the interlayer film and the laminated glass, the cesium-doped tungsten oxide particles are represented by the formula: Cs 0.33 Tungsten oxide particles represented by WO3 are preferred.

[0171] The average particle size of the heat shielding particles is preferably 0.01 μm or more, more preferably 0.02 μm or more, and is preferably 0.1 μm or less, more preferably 0.05 μm or less. When the average particle size is equal to or more than the lower limit, the heat shielding properties are sufficiently high. When the average particle size is equal to or less than the upper limit, the dispersibility of the heat shielding particles is high.

[0172] The "average particle size" refers to the volume average particle size. The average particle size can be measured using a particle size distribution measuring device (manufactured by Nikkiso Co., Ltd., "UPA-EX150") or the like.

[0173] In 100% by weight of the intermediate film or in 100% by weight of the layer containing the heat shielding particles (first layer, second layer, third layer or colored layer), the content of the heat shielding particles (particularly the content of the tungsten oxide particles) is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, even more preferably 1% by weight or more, and particularly preferably 1.5% by weight or more. In 100% by weight of the intermediate film or in 100% by weight of the layer containing the heat shielding particles (first layer, second layer, third layer or colored layer), the content of the heat shielding particles (particularly the content of the tungsten oxide particles) is preferably 6% by weight or less, more preferably 5.5% by weight or less, even more preferably 4% by weight or less, particularly preferably 3.5% by weight or less, and most preferably 3% by weight or less. When the content of the heat shielding particles is equal to or more than the lower limit and equal to or less than the upper limit, the heat shielding property is sufficiently high and the visible light transmittance is sufficiently high.

[0174] (Metal Salts) The interlayer preferably contains at least one metal salt (hereinafter, sometimes referred to as metal salt M) of an alkali metal salt and an alkaline earth metal salt. The first layer preferably contains the metal salt M. The second layer preferably contains the metal salt M. The third layer preferably contains the metal salt M. The colored layer preferably contains the metal salt M. The alkaline earth metal means six metals, Be, Mg, Ca, Sr, Ba, and Ra. The use of the metal salt M makes it easy to control the adhesion between the interlayer and a laminated glass member such as a glass plate, or the adhesion between each layer in the interlayer. Only one type of the metal salt M may be used, or two or more types may be used in combination.

[0175] The metal salt M preferably contains at least one metal selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba. The metal salt contained in the interlayer film preferably contains at least one metal selected from the group consisting of K and Mg.

[0176] Furthermore, an alkali metal salt of an organic acid having 2 to 16 carbon atoms and an alkaline earth metal salt of an organic acid having 2 to 16 carbon atoms can be used as the metal salt M. The metal salt M may include a magnesium salt of a carboxylate having 2 to 16 carbon atoms or a potassium salt of a carboxylate having 2 to 16 carbon atoms.

[0177] Examples of the magnesium salt of a carboxylate having 2 to 16 carbon atoms and the potassium salt of a carboxylate having 2 to 16 carbon atoms include magnesium acetate, potassium acetate, magnesium propionate, potassium propionate, magnesium 2-ethylbutyrate, potassium 2-ethylbutanoate, magnesium 2-ethylhexanoate, and potassium 2-ethylhexanoate.

[0178] The total content of Mg and K in the interlayer containing the metal salt M or in the layer (first layer, second layer, third layer or colored layer) containing the metal salt M is preferably 5 ppm or more, more preferably 10 ppm or more, even more preferably 20 ppm or more, and is preferably 300 ppm or less, more preferably 250 ppm or less, even more preferably 200 ppm or less. When the total content of Mg and K is equal to or more than the above lower limit and equal to or less than the above upper limit, the adhesion between the interlayer and a laminated glass member such as a glass plate, or the adhesion between each layer in the interlayer can be more well controlled.

[0179] (UV protection agent) The interlayer preferably contains an ultraviolet shielding agent. The first layer preferably contains an ultraviolet shielding agent. The second layer preferably contains an ultraviolet shielding agent. The third layer preferably contains an ultraviolet shielding agent. The colored layer preferably contains an ultraviolet shielding agent. By using an ultraviolet shielding agent, the visible light transmittance is more unlikely to decrease even when the interlayer and the laminated glass are used for a long period of time. Only one type of ultraviolet shielding agent may be used, or two or more types may be used in combination.

[0180] The ultraviolet shielding agent includes an ultraviolet absorbing agent. The ultraviolet shielding agent is preferably an ultraviolet absorbing agent.

[0181] Examples of the ultraviolet ray shielding agent include ultraviolet ray shielding agents containing metal atoms, ultraviolet ray shielding agents containing metal oxides, ultraviolet ray shielding agents having a benzotriazole structure (benzotriazole compounds), ultraviolet ray shielding agents having a benzophenone structure (benzophenone compounds), ultraviolet ray shielding agents having a triazine structure (triazine compounds), ultraviolet ray shielding agents having a malonic acid ester structure (malonic acid ester compounds), ultraviolet ray shielding agents having an oxalic acid anilide structure (oxalic acid anilide compounds), and ultraviolet ray shielding agents having a benzoate structure (benzoate compounds).

[0182] Examples of the ultraviolet shielding agent containing the metal atom include platinum particles, platinum particles whose surfaces are coated with silica, palladium particles, and palladium particles whose surfaces are coated with silica, etc. The ultraviolet shielding agent is preferably not a heat shielding particle.

[0183] The ultraviolet shielding agent is preferably an ultraviolet shielding agent having a benzotriazole structure, an ultraviolet shielding agent having a benzophenone structure, an ultraviolet shielding agent having a triazine structure, or an ultraviolet shielding agent having a benzoate structure. The ultraviolet shielding agent is more preferably an ultraviolet shielding agent having a benzotriazole structure or an ultraviolet shielding agent having a benzophenone structure, and further preferably an ultraviolet shielding agent having a benzotriazole structure.

[0184] Examples of the ultraviolet shielding agent containing the metal oxide include zinc oxide, titanium oxide, and cerium oxide. Furthermore, the ultraviolet shielding agent containing the metal oxide may be surface-coated. Examples of the surface-coating material of the ultraviolet shielding agent containing the metal oxide include insulating metal oxides, hydrolyzable organic silicon compounds, and silicone compounds.

[0185] The insulating metal oxide includes silica, alumina, zirconia, etc. The insulating metal oxide has a band gap energy of, for example, 5.0 eV or more.

[0186] Examples of the ultraviolet shielding agent having the benzotriazole structure include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole (BASF's "Tinuvin P"), 2-(2'-hydroxy-3',5'-di-t-butylphenyl)benzotriazole (BASF's "Tinuvin 320"), 2-(2'-hydroxy-3'-t-butyl-5-methylphenyl)-5-chlorobenzotriazole (BASF's "Tinuvin 326"), and 2-(2'-hydroxy-3',5'-di-amylphenyl)benzotriazole (BASF's "Tinuvin 328"), etc. Since the ultraviolet shielding agent has excellent ultraviolet shielding performance, it is preferable that the ultraviolet shielding agent has a benzotriazole structure containing a halogen atom, and more preferably has a benzotriazole structure containing a chlorine atom.

[0187] Examples of the ultraviolet screening agent having a benzophenone structure include octabenzone ("Chimassorb 81" manufactured by BASF).

[0188] Examples of the ultraviolet screening agent having a triazine structure include "LA-F70" manufactured by ADEKA Corporation and 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol ("Tinuvin 1577FF" manufactured by BASF).

[0189] Examples of the ultraviolet screening agent having a malonic acid ester structure include dimethyl 2-(p-methoxybenzylidene)malonate, tetraethyl-2,2-(1,4-phenylenedimethylidene)bismalonate, and 2-(p-methoxybenzylidene)-bis(1,2,2,6,6-pentamethyl-4-piperidinyl)malonate.

[0190] Commercially available ultraviolet screening agents having the above malonic acid ester structure include Hostavin B-CAP, Hostavin PR-25, and Hostavin PR-31 (all manufactured by Clariant).

[0191] Examples of ultraviolet screening agents having the above-mentioned oxalic acid anilide structure include oxalic acid diamides having an aryl group substituted on the nitrogen atom, such as N-(2-ethylphenyl)-N'-(2-ethoxy-5-t-butylphenyl)oxalic acid diamide, N-(2-ethylphenyl)-N'-(2-ethoxy-phenyl)oxalic acid diamide, and 2-ethyl-2'-ethoxy-oxalanilide ("Sanduvor VSU" manufactured by Clariant).

[0192] Examples of the ultraviolet screening agent having a benzoate structure include 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate ("Tinuvin 120" manufactured by BASF).

[0193] In 100% by weight of the interlayer film or in 100% by weight of the layer containing the ultraviolet ray shielding agent (first layer, second layer, third layer or colored layer), the content of the ultraviolet ray shielding agent and the content of the benzotriazole compound are preferably 0.1% by weight or more, more preferably 0.2% by weight or more, even more preferably 0.3% by weight or more, and particularly preferably 0.5% by weight or more. In this case, even if the interlayer film and the laminated glass are used for a long period of time, the visible light transmittance is more unlikely to decrease. In 100% by weight of the interlayer film or in 100% by weight of the layer containing the ultraviolet ray shielding agent (first layer, second layer, third layer or colored layer), the content of the ultraviolet ray shielding agent and the content of the benzotriazole compound are preferably 2.5% by weight or less, more preferably 2% by weight or less, even more preferably 1% by weight or less, and particularly preferably 0.8% by weight or less. In particular, by having the content of the ultraviolet ray shielding agent be 0.2% by weight or more in 100% by weight of the layer containing the ultraviolet ray shielding agent, the visible light transmittance is more resistant to decrease even when the interlayer film and the laminated glass are used for a long period of time.

[0194] (Antioxidants) The intermediate film preferably contains an antioxidant. The first layer preferably contains an antioxidant. The second layer preferably contains an antioxidant. The third layer preferably contains an antioxidant. The colored layer preferably contains an antioxidant. Only one type of antioxidant may be used, or two or more types may be used in combination.

[0195] The antioxidants include phenol-based antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants. The phenol-based antioxidants are antioxidants having a phenol skeleton. The sulfur-based antioxidants are antioxidants containing sulfur atoms. The phosphorus-based antioxidants are antioxidants containing phosphorus atoms.

[0196] The antioxidant is preferably a phenol-based antioxidant or a phosphorus-based antioxidant.

[0197] The phenol-based antioxidants include 2,6-di-t-butyl-p-cresol (BHT), butyl hydroxyanisole (BHA), 2,6-di-t-butyl-4-ethylphenol, stearyl-β-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, 2,2'-methylenebis-(4-methyl-6-butylphenol), 2,2'-methylenebis-(4-ethyl-6-t-butylphenol), 4,4'-butylidene-bis-(3-methyl-6-t-butylphenol), 1,1,3-tris-(2-methyl-hydroxy-5- t-butylphenyl)butane, tetrakis[methylene-3-(3',5'-butyl-4-hydroxyphenyl)propionate]methane, 1,3,3-tris-(2-methyl-4-hydroxy-5-t-butylphenol)butane, 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene, bis(3,3'-t-butylphenol)butyric acid glycol ester, and bis(3-t-butyl-4-hydroxy-5-methylbenzenepropanoic acid)ethylenebis(oxyethylene). One or more of these antioxidants are preferably used.

[0198] Examples of the phosphorus-based antioxidant include tridecyl phosphite, tris(tridecyl)phosphite, triphenyl phosphite, trinonylphenyl phosphite, bis(tridecyl)pentaerythritol diphosphite, bis(decyl)pentaerythritol diphosphite, tris(2,4-di-t-butylphenyl)phosphite, bis(2,4-di-t-butyl-6-methylphenyl)ethyl ester phosphorous acid, and 2,2'-methylenebis(4,6-di-t-butyl-1-phenyloxy)(2-ethylhexyloxy)phosphorus, etc. One or more of these antioxidants are preferably used.

[0199] Commercially available examples of the antioxidant include "IRGANOX 245" manufactured by BASF, "IRGAFOS 168" manufactured by BASF, "IRGAFOS 38" manufactured by BASF, "Sumilizer BHT" manufactured by Sumitomo Chemical Co., Ltd., "H-BHT" manufactured by Sakai Chemical Industry Co., Ltd., and "IRGANOX 1010" manufactured by BASF.

[0200] In order to maintain the high visible light transmittance of the interlayer film and laminated glass for a long period of time, the content of the antioxidant in 100% by weight of the interlayer film or in 100% by weight of the layer containing the antioxidant (first layer, second layer, third layer or colored layer) is preferably 0.03% by weight or more, and more preferably 0.1% by weight or more. In addition, since the effect of adding the antioxidant becomes saturated, the content of the antioxidant in 100% by weight of the interlayer film or in 100% by weight of the layer containing the antioxidant is preferably 2% by weight or less.

[0201] (Other ingredients) The intermediate film, the first layer, the second layer, the third layer and the colored layer may each contain additives such as a coupling agent, a dispersant, a surfactant, a flame retardant, an antistatic agent, an adhesion regulator other than a metal salt, a moisture resistant agent, a fluorescent brightener and an infrared absorbing agent, as necessary. These additives may be used alone or in combination of two or more kinds.

[0202] (Other details of interlayer film for laminated glass) The interlayer film may be wound into a roll of the interlayer film. The roll may include a winding core and the interlayer film wound around the outer periphery of the winding core.

[0203] The method for producing the interlayer film is not particularly limited. In the case of a single-layer interlayer film, the method for producing the interlayer film includes a method of extruding a resin composition using an extruder. In the case of a multi-layer interlayer film, the method for producing the interlayer film includes a method of forming each layer using each resin composition for forming each layer, and then laminating the obtained layers. Furthermore, the method for producing the interlayer film includes a method of laminating each layer by co-extruding each resin composition for forming each layer using an extruder. Since it is suitable for continuous production, a production method of extrusion molding is preferable. By adjusting the shape of the die outlet, the interlayer film having a specific thickness shape can be produced well.

[0204] In view of the excellent manufacturing efficiency of the interlayer film, it is preferable that the second layer and the third layer contain the same polyvinyl acetal resin. In view of the excellent manufacturing efficiency of the interlayer film, it is more preferable that the second layer and the third layer contain the same polyvinyl acetal resin and the same plasticizer. In view of the excellent manufacturing efficiency of the interlayer film, it is even more preferable that the second layer and the third layer are formed from the same resin composition.

[0205] At least one surface in the thickness direction of the interlayer film preferably has an uneven shape, and more preferably both surfaces in the thickness direction of the interlayer film preferably have an uneven shape. At least one surface in the thickness direction of the interlayer film in the colored region preferably has an uneven shape, and more preferably both surfaces in the thickness direction of the interlayer film in the colored region preferably have an uneven shape. At least one surface in the thickness direction of the interlayer film in the transparent region preferably has an uneven shape, and more preferably both surfaces in the thickness direction of the interlayer film in the transparent region preferably have an uneven shape.

[0206] The method for forming the above uneven shape is not particularly limited, and examples thereof include a lip embossing method, an embossing roll method, a calendar roll method, and a profile extrusion method.

[0207] At least one surface in the thickness direction of the interlayer film preferably has an uneven shape formed by an embossing roll method, and more preferably, both surfaces in the thickness direction of the interlayer film have an uneven shape formed by an embossing roll method. At least one surface in the thickness direction of the interlayer film in the colored region preferably has an uneven shape formed by an embossing roll method, and more preferably, both surfaces in the thickness direction of the interlayer film in the colored region have an uneven shape formed by an embossing roll method. At least one surface in the thickness direction of the interlayer film in the transparent region preferably has an uneven shape formed by an embossing roll method, and more preferably, both surfaces in the thickness direction of the interlayer film in the transparent region have an uneven shape formed by an embossing roll method. In this case, a large number of uneven embosses that are quantitatively uniform uneven patterns can be formed.

[0208] The maximum value of the ten-point average roughness Rz of the surface having the above-mentioned uneven shape of the interlayer film in the above-mentioned colored region is preferably 9 μm or more, more preferably 10 μm or more, even more preferably 15 μm or more, particularly preferably 20 μm or more, and is preferably 100 μm or less, more preferably 95 μm or less, and even more preferably 90 μm or less.

[0209] The maximum value of the ten-point average roughness Rz of the surface of the interlayer film having the above-mentioned uneven shape in the above-mentioned transparent region is preferably 9 μm or more, more preferably 10 μm or more, even more preferably 15 μm or more, particularly preferably 20 μm or more, and is preferably 100 μm or less, more preferably 95 μm or less, and even more preferably 90 μm or less.

[0210] The ten-point average roughness Rz is measured in accordance with JIS B0601:1994. For example, a "Surfcorder SE300" manufactured by Kosaka Laboratory Co., Ltd. can be used as a measuring device for measuring the ten-point average roughness Rz. More specifically, the ten-point average roughness Rz can be measured using a stylus with a tip radius of 2 μm and a tip angle of 60° under the following measurement conditions: cutoff value at the time of measurement: 2.5 mm, reference length: 2.5 mm, measurement length: 12.5 mm, preliminary length: 2.5 mm, and a palpation needle feed speed of 0.5 mm / sec, under an environment of 23° C. and 30 RH%.

[0211] The maximum value of the ten-point average roughness Rz can be measured as follows. Five locations, 5 mm or more apart from each other in the width direction of the interlayer film, are used as measurement points. At each measurement point, the angle of the measuring device is rotated by 45 degrees to measure the ten-point average roughness Rz a total of eight times, and the maximum value is taken as the ten-point average roughness at each measurement point. The maximum value of the ten-point average roughness Rz obtained at the five measurement points is taken as the ten-point average roughness Rz of the surface in the thickness direction of the interlayer film in the colored region or the transparent region.

[0212] (Laminated glass) The laminated glass according to the present invention includes a first laminated glass member, a second laminated glass member, and an interlayer film for laminated glass. In the laminated glass according to the present invention, the interlayer film for laminated glass is disposed between the first laminated glass member and the second laminated glass member.

[0213] In the laminated glass according to the present invention, the interlayer film according to the present invention may be used.

[0214] When the parallel light transmittance of the laminated glass according to the present invention is measured, it is preferred that the laminated glass has a colored region with a parallel light transmittance of less than 60% and a transparent region with a parallel light transmittance of 60% or more.

[0215] In the laminated glass of the present invention, it is preferable that the average thickness of the interlayer film in the colored region is smaller than the average thickness of the interlayer film in the transparent region, and the absolute value of the difference between the average thickness of the interlayer film in the colored region and the average thickness of the interlayer film in the transparent region is 10 μm or more.

[0216] Since the laminated glass according to the present invention has the above-mentioned configuration, it is possible to suppress color transfer of the interlayer film used in the laminated glass, and therefore the laminated glass according to the present invention can have a good appearance.

[0217] The parallel light transmittance of the laminated glass according to the present invention is measured in the same manner as the parallel light transmittance of the laminated glass X described above.

[0218] The first laminated glass member is preferably a first glass plate, and the second laminated glass member is preferably a second glass plate.

[0219] Examples of the first and second laminated glass members include glass plates and PET (polyethylene terephthalate) films. The laminated glass includes not only a laminated glass having an intermediate film sandwiched between two glass plates, but also a laminated glass having an intermediate film sandwiched between a glass plate and a PET film or the like. The laminated glass is a laminate including glass plates, and preferably includes at least one glass plate. It is preferable that the first laminated glass member and the second laminated glass member are glass plates or PET films, respectively, and that the laminated glass includes a glass plate as at least one of the first laminated glass member and the second laminated glass member. It is particularly preferable that both the first and second laminated glass members are glass plates.

[0220] The glass plate includes inorganic glass and organic glass. The inorganic glass includes float plate glass, heat absorbing plate glass, heat reflecting plate glass, polished plate glass, patterned plate glass, lined plate glass, green glass, etc. The organic glass is a synthetic resin glass that replaces inorganic glass. The organic glass includes polycarbonate plate and poly(meth)acrylic resin plate, etc. The poly(meth)acrylic resin plate includes polymethyl(meth)acrylate plate, etc.

[0221] The thickness of each of the first laminated glass member and the second laminated glass member is preferably 1 mm or more, preferably 5 mm or less, more preferably 3 mm or less. When the laminated glass member is a glass plate, the thickness of the glass plate is preferably 0.5 mm or more, more preferably 0.7 mm or more, and preferably 5 mm or less, more preferably 3 mm or less. When the laminated glass member is a PET film, the thickness of the PET film is preferably 0.03 mm or more, and preferably 0.5 mm or less.

[0222] The method for producing the laminated glass is not particularly limited. First, an interlayer film is sandwiched between the first laminated glass member and the second laminated glass member to obtain a laminate. Next, for example, the obtained laminate is passed through a pressing roll or placed in a rubber bag and sucked under reduced pressure to remove air remaining between the first laminated glass member, the second laminated glass member, and the interlayer film. Then, the laminate is pre-bonded at about 70°C to 110°C to obtain a pre-pressed laminate. Next, the pre-pressed laminate is placed in an autoclave or pressed to be pressed at about 120°C to 150°C and a pressure of 1 MPa to 1.5 MPa. In this manner, a laminated glass can be obtained.

[0223] The interlayer film and the laminated glass can be used in automobiles, railroad vehicles, aircraft, ships, buildings, etc. The interlayer film and the laminated glass can be used for purposes other than these. The interlayer film and the laminated glass are preferably interlayer films and laminated glasses for vehicles or buildings, and more preferably interlayer films and laminated glasses for vehicles. The interlayer film and the laminated glass can be used for automobile front glass, side glass, rear glass, roof glass, backlight glass, etc. The interlayer film and the laminated glass are preferably used in automobiles. The interlayer film is preferably used to obtain laminated glass for automobiles.

[0224] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0225] In the polyvinyl acetal resin used, n-butyl aldehyde with 4 carbon atoms was used for acetalization. For the polyvinyl acetal resin, the degree of acetalization (degree of butyralization), the degree of acetylation, and the content of hydroxyl groups were measured by a method conforming to JIS K6728 "Testing Method for Polyvinyl Butyral." When measured by ASTM D1396-92, the values ​​were similar to those obtained by a method conforming to JIS K6728 "Testing Method for Polyvinyl Butyral."

[0226] Example 1 Preparation of resin composition for forming first layer: The following components were mixed and thoroughly kneaded with a mixing roll to obtain a composition for forming a first layer.

[0227] Polyvinyl acetal resin (average degree of polymerization 3000, hydroxyl group content 22 mol%, acetylation degree 13 mol%, acetalization degree 65 mol%) 100 parts by weight Triethylene glycol di-2-ethylhexanoate (3GO) 60 parts by weight BASF's "Tinuvin 326" (2-(2'-hydroxy-3'-t-butyl-5-methylphenyl)-5-chlorobenzotriazole) in an amount of 0.2% by weight in the resulting first layer BHT (2,6-di-t-butyl-p-cresol) in an amount of 0.2% by weight in the resulting first layer

[0228] Preparation of resin compositions for forming the second layer and the third layer: The following components were blended and thoroughly kneaded with a mixing roll to obtain compositions for forming the second layer and the third layer.

[0229] Polyvinyl acetal resin (average polymerization degree 1700, hydroxyl group content 30.5 mol%, acetylation degree 1 mol%, acetalization degree 68.5 mol%) 100 parts by weight Triethylene glycol di-2-ethylhexanoate (3GO) 38 parts by weight BASF's "Tinuvin 326" (2-(2'-hydroxy-3'-t-butyl-5-methylphenyl)-5-chlorobenzotriazole) in an amount of 0.2% by weight in the resulting second and third layers BHT (2,6-di-t-butyl-p-cresol) in an amount of 0.2% by weight in the resulting second and third layers

[0230] Preparation of resin composition for forming colored layer: The following components were mixed and thoroughly kneaded with a mixing roll to obtain a composition for forming a colored layer.

[0231] Polyvinyl acetal resin (average polymerization degree 1700, hydroxyl group content 30.5 mol%, acetylation degree 1 mol%, acetalization degree 68.5 mol%) 100 parts by weight Triethylene glycol-di-2-ethylhexanoate (3GO) 40 parts by weight Calcium carbonate particles (inorganic particles, weight average particle diameter 5.0 μm) in an amount of 5.9% by weight in 100% by weight of the resin composition for forming the colored layer (100% by weight of the resulting colored layer)

[0232] Preparation of interlayer and roll body: The resin composition for forming the first layer, the resin composition for forming the second and third layers, and the resin composition for forming the colored layer were co-extruded using a co-extruder to obtain an interlayer film before embossing. The obtained interlayer film before embossing was embossed at a linear pressure of 0.30 kN / cm by an embossing roll method to produce an interlayer film. The obtained interlayer film was wound into a roll.

[0233] Laminated glass preparation: An interlayer film was sandwiched between two sheets of 2 mm thick clear glass conforming to JIS R3202:1996 to obtain a laminate. The obtained laminate was placed in a rubber bag and degassed for 20 minutes at a vacuum degree of 2.6 kPa, and then transferred in the degassed state to an oven and further held at 90°C for 30 minutes to perform vacuum pressing to pre-bond the laminate. The pre-bonded laminate was pressed for 20 minutes in an autoclave under conditions of 135°C and a pressure of 1.2 MPa to obtain a laminated glass. The obtained laminated glass corresponds to the above-mentioned laminated glass X.

[0234] (Examples 2 to 9 and Comparative Examples 1 and 2) Except for changing the configuration of the interlayer film as shown in Tables 1 and 2, an interlayer film, a roll body, and a laminated glass were produced in the same manner as in Example 1.

[0235] (evaluation) (1) Measurement of parallel light transmittance The parallel light transmittance of the obtained laminated glass was measured by the above-mentioned method. The obtained interlayer film had a colored region and a transparent region in this order from one end side to the other end side in the width direction of the interlayer film.

[0236] (2) Maximum ten-point average roughness Rz of the surface in the thickness direction of the interlayer film in the colored area The ten-point average roughness Rz of the surface in the thickness direction of the interlayer film in the colored region was measured by the method described above, and the maximum value of the ten-point average roughness Rz was determined.

[0237] (3) Color transfer The obtained roll was left to stand for 24 hours or 168 hours in an environment at 16°C. After standing, the interlayer film was unwound from the roll. An inspector visually inspected the surface of the interlayer film at a position 20 m unwound, and evaluated color transfer according to the following criteria.

[0238] [Color transfer criteria] ○: No uneven coloring due to color transfer △: Slight color unevenness due to color transfer (not a problem in actual use) ×: Color unevenness occurs due to color transfer

[0239] The composition of the interlayer and the results are shown in Tables 1 and 2 below.

[0240] [Table 1]

[0241] [Table 2] [Explanation of symbols]

[0242] 1, 1A, 1B...First layer 2,2B…Second layer 3,3B…Third layer 4,4A,4B…Colored layer 11,11A,11B...intermediate film 51...Roll body 61...Core X…Colored area Y…Transparent area

Claims

1. The interlayer film is placed between two sheets of clear glass conforming to JIS R3202:1996 to obtain laminated glass X, and when the parallel light transmittance of the obtained laminated glass X is measured, the interlayer film has a colored region having a parallel light transmittance of less than 60% and a transparent region having a parallel light transmittance of 60% or more, the average thickness of the interlayer film in the colored region is smaller than the average thickness of the interlayer film in the transparent region; An interlayer film for laminated glass, wherein the absolute value of the difference between the average thickness of the interlayer film in the colored region and the average thickness of the interlayer film in the transparent region is 10 μm or more.

2. the colored region has a colored layer having a parallel light transmittance of less than 60%, 2. The interlayer film for laminated glass according to claim 1, wherein the shortest distance between a surface of the interlayer film in a thickness direction and a surface of the colored layer in the thickness direction is 10 μm or more.

3. At least one surface in the thickness direction of the interlayer film in the colored region has an uneven shape formed by an embossing roll method, 3. The interlayer film for laminated glass according to claim 1, wherein the maximum value of ten-point average roughness Rz of the surface having the irregular shape of the interlayer film in the colored region is 9 μm or more.

4. a first laminated glass member; a second laminated glass member; and The interlayer film for laminated glass according to any one of claims 1 to 3, The laminated glass, wherein the interlayer film for laminated glass is disposed between the first laminated glass member and the second laminated glass member.

5. a first laminated glass member; a second laminated glass member; and and an interlayer film for laminated glass, the interlayer film for laminated glass is disposed between the first laminated glass member and the second laminated glass member; When the parallel light transmittance of the laminated glass is measured, the laminated glass has a colored region having a parallel light transmittance of less than 60% and a transparent region having a parallel light transmittance of 60% or more, the average thickness of the interlayer film in the colored region is smaller than the average thickness of the interlayer film in the transparent region; The absolute value of the difference between the average thickness of the interlayer film in the colored region and the average thickness of the interlayer film in the transparent region is 10 μm or more.

Images