Intermediate film for laminated glass, and laminated glass

Abstract

Provided is an intermediate film for laminated glass, which is capable of suppressing both a reflected ghosting image and a transmitted ghosting image of laminated glass. This interlayer for laminated glass is used as laminated glass for a head-up display, has a display-corresponding region corresponding to a display region of the head-up display, and also has one end and the other end located on the opposite side of the one end, the thickness of the other end being greater than the thickness of the one end, and when the amount of change in thickness is measured, the thickness of the interlayer is less than the thickness of the other end. The absolute value of the difference between the maximum value of the measured values of the amount of change in thickness and the minimum value of the measured values of the amount of change in thickness is 32 [mu] m or less. The thickness change amount is a thickness change amount within a distance of 80 mm in a direction connecting the one end and the other end from the one end side to the other end side with a position at an interval of 2 mm in the display corresponding area as a center. The wedge angle of a region located on the other end side than the display-corresponding region is smaller than the wedge angle of the display-corresponding region.

Description

[0001] This application is a divisional application of Chinese patent application No. 201780017155.8, entitled "Intermediate Film for Laminated Glass and Laminated Glass", filed on March 29, 2017. Technical Field

[0002] This invention relates to an interlayer for obtaining laminated glass. Furthermore, this invention relates to a laminated glass using the aforementioned interlayer. Background Technology

[0003] Generally, even if laminated glass breaks due to external impact, the number of glass fragments scattered is relatively small, resulting in excellent safety. Therefore, laminated glass is widely used in automobiles, rail vehicles, aircraft, ships, and buildings. Laminated glass is manufactured by sandwiching an interlayer film between two glass sheets.

[0004] In addition, a head-up display (HUD) is known as a type of laminated glass used in automobiles. A HUD can display measurement information such as speed, which are driving data of the vehicle, on the windshield of the car.

[0005] The HUD has a problem where the measurement information displayed on the windshield appears to be ghosted.

[0006] To suppress ghosting images, a wedge-shaped interlayer is used. Patent Document 1 discloses a laminated glass formed by sandwiching a wedge-shaped interlayer with a specific wedge angle between a pair of glass plates. In this laminated glass, by adjusting the wedge angle of the interlayer, the measurement information displayed by reflection from one glass plate and the measurement information displayed by reflection from the other glass plate can be combined into a single point in the driver's field of vision. Therefore, the displayed measurement information is less likely to be perceived as ghosting and does not obstruct the driver's view.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: Japanese Patent Publication No. 4-502525 Summary of the Invention

[0010] The technical problem solved by the invention

[0011] In a HUD, reflected ghosting images are undesirable in the display area where information is measured. Reflected ghosting images are a phenomenon observed due to the projection of information from the information display device.

[0012] Furthermore, in automotive HUDs, the area above the display area is where the driver confirms the road ahead. Therefore, it is undesirable for transmitted ghosting images to occur in this area. Transmitted ghosting images are a phenomenon where, for example, a ghost image is observed through the headlights of an oncoming vehicle.

[0013] In existing intermediate films, it is difficult to sufficiently suppress both reflected ghosting and transmitted ghosting images.

[0014] The object of this invention is to provide an interlayer film for laminated glass that can suppress reflected ghosting and transmitted ghosting images in laminated glass. Furthermore, the object of this invention is to provide laminated glass using the aforementioned interlayer film.

[0015] Technical means to solve the problem

[0016] According to a broad aspect of the present invention, an interlayer film for laminated glass (sometimes simply referred to as "interlayer film" in this specification) is provided for use as laminated glass in a head-up display. The interlayer film has a display corresponding area corresponding to the display area of ​​the head-up display. The interlayer film has one end and another end located on the opposite side of the first end, and the thickness of the other end is greater than the thickness of the first end. When measuring the thickness change, the absolute value of the difference between the maximum and minimum values ​​of the measured thickness change is 32 μm or less. The thickness change is the thickness change within a distance of 80 mm in the direction connecting the first end and the other end, centered at 2 mm intervals of the display corresponding area, from the first end to the other end. Furthermore, the wedge angle of the region located further on the other end than the display corresponding area is smaller than the wedge angle of the display corresponding area.

[0017] In a particular embodiment of the intermediate film of the present invention, the wedge angle of the region located further to the other end than the display corresponding region is 0.05 mrad smaller than the wedge angle of the display corresponding region.

[0018] In a particular embodiment of the intermediate film of the present invention, the display corresponding area is provided in a region extending from a position 10 cm from one end toward the other end to a position 59.8 cm from one end toward the other end.

[0019] The wedge angle of the region located on the other end side, which is further than the corresponding display area, is 0.7 mrad or less, more preferably 0.5 mrad or less, even more preferably 0.3 mrad or less, and particularly preferably 0.1 mrad or less.

[0020] The intermediate film preferably contains a thermoplastic resin. The intermediate film preferably contains a plasticizer.

[0021] In a particular embodiment of the intermediate film of the present invention, it comprises a first layer and a second layer disposed on a first surface side of the first layer.

[0022] In a particular embodiment of the intermediate film of the present invention, the first layer contains polyvinyl acetal resin, the second layer contains polyvinyl acetal resin, and the hydroxyl content of the polyvinyl acetal resin in the first layer is lower than the hydroxyl content of the polyvinyl acetal resin in the second layer.

[0023] In a particular embodiment of the intermediate film of the present invention, the first layer contains polyvinyl acetal resin, the second layer contains polyvinyl acetal resin, the first layer contains a plasticizer, the second layer contains a plasticizer, and the content of the plasticizer in the first layer relative to 100 parts by weight of the polyvinyl acetal resin in the first layer is higher than the content of the plasticizer in the second layer relative to 100 parts by weight of the polyvinyl acetal resin in the second layer.

[0024] According to a broad aspect of the present invention, a laminated glass is provided having a first laminated glass component, a second laminated glass component, and an interlayer for the laminated glass, wherein the interlayer for the laminated glass is disposed between the first laminated glass component and the second laminated glass component.

[0025] Effects of the Invention

[0026] According to the present invention, an interlayer film for laminated glass is used as laminated glass for a head-up display. The interlayer film has a display corresponding area corresponding to the display area of ​​the head-up display. The interlayer film has one end and another end located on the opposite side of the one end, and the thickness of the other end is greater than the thickness of the one end. When measuring the thickness change, the absolute value of the difference between the maximum value and the minimum value of the thickness change is 32 μm or less. The thickness change is the thickness change within a distance of 80 mm in the direction connecting the one end and the other end, centered at 2 mm intervals of the display corresponding area from the one end to the other end. Furthermore, the wedge angle of the area located further on the other end than the display corresponding area is smaller than the wedge angle of the display corresponding area. Therefore, both reflected ghosting images and transmitted ghosting images in the laminated glass can be suppressed. Attached Figure Description

[0027] [ Figure 1 ] Figure 1 (a) and (b) are schematic cross-sectional and front views of the interlayer film for laminated glass according to the first embodiment of the present invention.

[0028] [ Figure 2] Figure 2 (a) and (b) are schematic cross-sectional and front views of the interlayer film for laminated glass according to the second embodiment of the present invention.

[0029] [ Figure 3 ] Figure 3 It means that it was used. Figure 1 The diagram shows a cross-sectional view of an example of laminated glass with an interlayer.

[0030] [ Figure 4 ] Figure 4 It is a schematic representation. Figure 1 The image shown is a three-dimensional view of a laminated glass roll made by winding an interlayer film.

[0031] [ Figure 5 ] Figure 5 This is a diagram used to illustrate the pre-compression method in the evaluation of ghost images. Detailed Implementation

[0032] The details of the present invention will be described below.

[0033] The interlayer film for laminated glass of the present invention (sometimes simply referred to as "interlayer film" in this specification) is used in the laminated glass of a head-up display (HUD). The interlayer film of the present invention is an interlayer film for HUD.

[0034] The intermediate film of the present invention has a display corresponding area that corresponds to the display area of ​​a head-up display. The display corresponding area is an area where information can be displayed well.

[0035] The interlayer membrane of the present invention has a single-layer structure or a structure with two or more layers. The interlayer membrane of the present invention can have a single-layer structure or a structure with two or more layers. The interlayer membrane of the present invention can have a two-layer structure or a structure with three or more layers. The interlayer membrane of the present invention can be a single-layer interlayer membrane or a multi-layer interlayer membrane.

[0036] The intermediate film of the present invention has one end and another end located on the opposite side of the first end. The first end and the other end are opposite ends of the intermediate film. In the intermediate film of the present invention, the thickness of the other end is greater than the thickness of the first end.

[0037] In the intermediate film of the present invention, the thickness change within 80 mm in the direction connecting the one end and the other end, centered at positions 2 mm apart from the one end to the other end of the display corresponding area. The thickness change is measured within the display corresponding area. Starting from a position 4 cm from the end of the display corresponding area towards the other end and ending at a position 4 cm from the end of the display corresponding area towards the one end, positions are selected at 2 mm intervals, and the thickness change within 80 mm in the direction connecting the one end and the other end is measured centered at each position. For example, when the length of the display corresponding area from one end to the other end is 500 mm, positions are selected at 2 mm intervals from a position 4 mm from one end of the display corresponding area to a position 496 mm from that position. When the length of the corresponding area from one end to the other is 500mm, 247 positions are selected at 2mm intervals. The thickness change within 80mm is measured along a path connecting the two ends, with each 2mm interval as the center. This yields 247 measurement values. The thickness change within 80mm of position A is measured. Position B is adjacent to position A and 2mm away; the thickness change within 80mm of position B is measured. Position C is adjacent to position B and 2mm away; the thickness change within 80mm of position C is measured. This measurement process is repeated to obtain 247 measurement values.

[0038] The thickness variation was measured in regions spaced 2 mm apart (80 mm apart). This thickness variation is the absolute value of the difference between the maximum and minimum thickness values ​​in each region spaced 2 mm apart (80 mm apart).

[0039] In the intermediate film of the present invention, the absolute difference between the maximum and minimum values ​​of the thickness variation measurements is less than 32 μm. For example, when the length of the corresponding region from one end to the other is 500 mm, the absolute difference between the maximum and minimum values ​​of the 247 thickness variation measurements is less than 32 μm.

[0040] In the intermediate film of the present invention, the wedge angle of the region located further to the other end than the display corresponding region is smaller than the wedge angle of the display region. The wedge angle θ of the display corresponding region is the interior angle at the intersection of two straight lines: a straight line connecting the first surface (surface on one side) of the display corresponding region containing the maximum and minimum thickness portions, and a straight line connecting the second surface (surface on the other side) of the display corresponding region containing the maximum and minimum thickness portions. The wedge angle of the region located further to the other end than the display corresponding region is the interior angle at the intersection of two straight lines: a straight line connecting the first surface (surface on one side) of the region located further to the other end than the display corresponding region containing the maximum and minimum thickness portions, and a straight line connecting the second surface (surface on the other side) of the region located further to the other end than the display corresponding region containing the maximum and minimum thickness portions, and a straight line connecting the second surface (surface on the other side) of the region located further to the other end than the display corresponding region containing the maximum and minimum thickness portions. It should be noted that the following... Figure 1 , 2 In the diagram, the wedge angle of the corresponding region and the wedge angle of the region located further to the other end than the corresponding region are both illustrated as the wedge angle θ of the intermediate membrane. Regarding the wedge angle of the corresponding region, in... Figure 1 , 2 In the corresponding display area R1, the wedge angle is obtained in the same way as the wedge angle θ. Regarding the wedge angle of the area located on the other side of the display area, which is further from the corresponding display area, in... Figure 1 , 2 The ratio is found in the region located on the other side (the upper peripheral region R2 and the shading region R3), which is located further from the corresponding region, in the same way as the wedge angle θ.

[0041] In this invention, due to the aforementioned configuration, both reflected ghosting images and transmitted ghosting images in the laminated glass can be suppressed simultaneously. In this invention, when display information is reflected from the display unit to the laminated glass, both reflected ghosting images and transmitted ghosting images can be suppressed simultaneously.

[0042] From the viewpoint of further suppressing transmission ghosting images, the wedge angle of the region located further to the other end than the corresponding display area is preferably 0.05 mrad smaller than the wedge angle of the corresponding display area, more preferably 0.1 mrad smaller, further preferably 0.15 mrad smaller, particularly preferably 0.2 mrad smaller, and most preferably 0.3 mrad smaller. From the viewpoint of further suppressing transmission ghosting images, the wedge angle of the region located further to the other end than the corresponding display area is preferably 0.7 mrad or less, more preferably 0.5 mrad or less, further preferably 0.3 mrad or less, and particularly preferably 0.1 mrad or less. The wedge angle of the region located further to the other end than the corresponding display area can be 0 mrad or more, or 0.1 mrad or more.

[0043] From the viewpoint of further effectively suppressing reflected ghosting images, the thickness increases from one end to the other end in a region of preferably more than 80% (more preferably more than 85%, more preferably more than 90%, particularly preferably more than 95%) of the area between 10 cm from one end toward the other end and 59.8 cm from one end toward the other end.

[0044] The intermediate film of the present invention has a display corresponding area that corresponds to the display area of ​​the HUD. The display corresponding area is an area where information can be displayed well. From the viewpoint of further effectively suppressing reflected ghosting images, the intermediate film of the present invention preferably has the display corresponding area in the region from a position 10 cm from one end toward the other end to a position 59.8 cm from one end toward the other end.

[0045] From the viewpoint of further effectively suppressing reflected ghosting images, in the region from a position 10 cm from one end toward the other end to a position 59.8 cm from one end toward the other end, the intermediate film preferably has a wedge-shaped portion in the thickness direction.

[0046] The intermediate film of the present invention may have a light-shielding area. This light-shielding area may be separate from the display corresponding area. The light-shielding area is provided, for example, to prevent dizziness in a driver due to sunlight or outdoor lighting. Sometimes, the light-shielding area is provided to provide heat insulation. The light-shielding area is preferably located at the edge portion of the intermediate film. The light-shielding area is preferably strip-shaped.

[0047] In the light-shielding areas, colorants or fillers may be used to alter the color and visible light transmittance. The colorant or filler may be contained only in a portion of the thickness direction of the interlayer, or it may be contained throughout the entire thickness direction of the interlayer.

[0048] From the viewpoint of improving display quality and further expanding the field of view, the visible light transmittance of the display area is preferably 80% or more, more preferably 88% or more, and even more preferably 90% or more. The visible light transmittance of the display area is preferably higher than that of the light-shielding area. The visible light transmittance of the display area may be lower than that of the light-shielding area. The visible light transmittance of the display area is preferably 50% or more higher than that of the light-shielding area, more preferably 60% or more higher.

[0049] It should be noted that, for example, when displaying the changes in visible light transmittance in the intermediate film of the corresponding area and the light-shielding area, the visible light transmittance is measured at the center position of the corresponding area and the center position of the light-shielding area.

[0050] The visible light transmittance of the laminated glass in the wavelength range of 380–780 nm was measured using a spectrophotometer (Hitachi High-Technologies Corporation, “U-4100”) according to JIS R3211 (1998). It should be noted that a transparent glass with a thickness of 2 mm is preferably used as the glass plate.

[0051] The display area preferably has a length direction and a width direction. Due to the excellent versatility of the intermediate film, the width direction of the display area is preferably the direction connecting one end and the other end. The display area is preferably strip-shaped.

[0052] The intermediate film preferably has an MD direction and a TD direction. The intermediate film is obtained, for example, by melt extrusion molding. The MD direction is the flow direction of the intermediate film during manufacturing. The TD direction is a direction perpendicular to the flow direction of the intermediate film during manufacturing and also perpendicular to the thickness direction of the intermediate film. The one end and the other end are preferably located on opposite sides of the TD direction.

[0053] The MD and TD directions can be identified, for example, by the winding direction of the intermediate film roll. This is because the intermediate film roll is wound in the flow direction of the intermediate film during manufacturing, so the winding direction of the intermediate film in the roll is the same as the flow direction of the intermediate film during manufacturing.

[0054] From the perspective of further improving the display quality, the intermediate film preferably has a wedge-shaped portion in the thickness direction. The wedge-shaped cross-sectional shape in the thickness direction of the corresponding display area is preferred.

[0055] Hereinafter, specific embodiments of the present invention will be described with reference to the figures.

[0056] Figure 1(a) and (b) are schematic cross-sectional and front views illustrating the interlayer film for laminated glass according to the first embodiment of the present invention. Figure 1 (a) is along Figure 1 (b) shows the cross-sectional view taken from line II. It should be noted that... Figure 1 The size and dimensions of the intermediate membrane in the following figures have been appropriately altered in terms of actual size and shape for ease of illustration.

[0057] exist Figure 1 In (a), the cross-section of the intermediate film 11 in the thickness direction is shown. It should be noted that... Figure 1 In (a) and the figures described below, for ease of illustration, the thickness of the intermediate film and the thickness and wedge angle θ of each layer constituting the intermediate film are shown to differ from the actual thickness and wedge angle.

[0058] Intermediate film 11 includes a first layer 1 (intermediate layer), a second layer 2 (surface layer), and a third layer 3 (surface layer). The second layer 2 is disposed and stacked on the first surface side of the first layer 1. The third layer 3 is disposed and stacked on the second surface side opposite to the first surface of the first layer 1. The first layer 1 is disposed and sandwiched between the second layer 2 and the third layer 3. Intermediate film 11 is used to obtain laminated glass. Intermediate film 11 is an intermediate film for laminated glass. Intermediate film 11 is a multilayer intermediate film.

[0059] The intermediate membrane 11 has one end 11a and another end 11b located on the opposite side of the first end 11a. The first end 11a and the second end 11b are opposite ends. The second layer 2 and the third layer 3 have a wedge-shaped cross-section in the thickness direction. The first layer 1 has a rectangular cross-section in the thickness direction. The thickness of the second layer 2 and the third layer 3 is greater on the side of the second end 11b than on the side of the first end 11a. Therefore, the thickness of the intermediate membrane 11 at the other end 11b is greater than the thickness at the first end 11a. Thus, the intermediate membrane 11 has a thinner region and a thicker region.

[0060] The intermediate film 11 has a display corresponding area R1 that corresponds to the display area of ​​the head-up display. The intermediate film 11 has a peripheral area R2 adjacent to the display corresponding area R1. In this embodiment, the display corresponding area R1 is the area from a position of 10 cm from one end 11a toward the other end 11b to a position of 59.8 cm from one end 11a toward the other end 11b.

[0061] The intermediate film 11 has a light-shielding region R3 that is separate from the display corresponding region R1. The light-shielding region R3 is located at the edge portion of the intermediate film 11.

[0062] Figure 4 It is a schematic representation Figure 1 The image shown is a three-dimensional view of a laminated glass roll made by winding an interlayer film.

[0063] The intermediate film 11 can be wound to form a roll 51 of the intermediate film 11.

[0064] Figure 4 The roll 51 shown includes a core 61 and an intermediate film 11. The intermediate film 11 is wound around the outer periphery of the core 61.

[0065] Figure 2 (a) and (b) are schematic cross-sectional and front views illustrating the interlayer film for laminated glass according to the second embodiment of the present invention. Figure 2 (a) is along Figure 2 (b) is a cross-sectional view taken from line II. Figure 2 (a) represents the cross section in the thickness direction of the intermediate membrane 11A.

[0066] Figure 2 The interlayer 11A shown includes a first layer 1A. The interlayer 11A has a monolayer structure consisting only of the first layer 1A and is a monolayer interlayer. The interlayer 11A is the first layer 1A. The interlayer 11A is used to obtain laminated glass. The interlayer 11A is an interlayer for laminated glass.

[0067] The intermediate film 11A has one end 11a and another end 11b located on the opposite side of the first end 11a. The first end 11a and the other end 11b are opposite ends. The thickness of the other end 11b of the intermediate film 11A is greater than the thickness of the first end 11a. Therefore, the intermediate film 11A and the first layer 1A have a thinner region and a thicker region.

[0068] The intermediate membrane 11A and the first layer 1A have rectangular cross-sectional shapes 11Aa and 1Aa in the thickness direction and wedge-shaped cross-sectional shapes 11Ab and 1Ab in the thickness direction.

[0069] The intermediate film 11A has a display corresponding area R1 that corresponds to the display area of ​​the head-up display. The intermediate film 11A has a peripheral area R2 adjacent to the display corresponding area R1.

[0070] The intermediate film 11A has a light-shielding region R3 that is separate from the display corresponding region R1. The light-shielding region R3 is located at the edge portion of the intermediate film 11A.

[0071] The intermediate membrane preferably has a wedge-shaped cross-section in the thickness direction. The intermediate membrane preferably has a portion where the thickness gradually increases from one end to the other. The cross-sectional shape of the intermediate membrane in the thickness direction is preferably wedge-shaped. Examples of cross-sectional shapes in the thickness direction of the intermediate membrane include trapezoids, triangles, and pentagons.

[0072] To suppress ghosting images, the wedge angle θ of the interlayer film can be appropriately set according to the installation angle of the laminated glass. From the viewpoint of further suppressing ghosting images, the wedge angle θ of the interlayer film is preferably 0.2 mrad (0.0115 degrees) or more, preferably 2 mrad (0.1146 degrees) or less, more preferably 1 mrad (0.05273 degrees) or less, and even more preferably 0.7 mrad (0.0401 degrees) or less. The wedge angle θ of the interlayer film is the interior angle at the intersection of the following two straight lines: the straight line connecting the first surface (surface on one side) of the interlayer film between its maximum and minimum thickness portions, and the straight line connecting the second surface (surface on the other side) of the interlayer film between its maximum and minimum thickness portions.

[0073] To suppress reflected ghosting images, the wedge angle θ of the interlayer film can be appropriately set according to the installation angle of the laminated glass. From the viewpoint of further suppressing ghosting images, the wedge angle of the display area of ​​the interlayer film is preferably 0.2 mrad (0.0115 degrees) or more, preferably 2 mrad (0.1146 degrees) or less, and more preferably 1 mrad (0.05273 degrees) or less.

[0074] The thickness of the intermediate film is not particularly limited. The thickness of the intermediate film represents the total thickness of the layers constituting the intermediate film. Therefore, in the case of a multilayer intermediate film 11, the thickness of the intermediate film is represented by the total thickness of the first layer 1, the second layer 2, and the third layer 3.

[0075] The maximum thickness of the interlayer is preferably 0.1 mm or more, more preferably 0.25 mm or more, even more preferably 0.5 mm or more, especially preferably 0.8 mm or more, and preferably 3 mm or less, more preferably 2 mm or less, and even more preferably 1.5 mm or less.

[0076] When the distance between one end and the other end is defined as X, the intermediate film preferably has a minimum thickness in the region extending from one end inward at a distance of 0X to 0.2X, and a maximum thickness in the region extending from the other end inward at a distance of 0X to 0.2X. More preferably, the intermediate film has a minimum thickness in the region extending from one end inward at a distance of 0X to 0.1X, and a maximum thickness in the region extending from the other end inward at a distance of 0X to 0.1X. The intermediate film preferably has a minimum thickness at one end and a maximum thickness at the other end. Intermediate films 11 and 11A have a maximum thickness at the other end 11b and a minimum thickness at one end 11a.

[0077] From a practical point of view, and from the point of view of fully improving adhesion and penetration resistance, the maximum thickness of the surface layer is preferably 0.001 mm or more, more preferably 0.2 mm or more, further preferably 0.3 mm or more, and preferably 1 mm or less, and more preferably 0.8 mm or less.

[0078] From a practical point of view and from the point of view of fully improving penetration resistance, the maximum thickness of the layer (intermediate layer) disposed between the two surface layers is preferably 0.001 mm or more, more preferably 0.1 mm or more, even more preferably 0.2 mm or more, and preferably 0.8 mm or less, more preferably 0.6 mm or less, and even more preferably 0.3 mm or less.

[0079] The distance X between one end of the intermediate membrane and the other end is preferably less than 3m, more preferably less than 2m, particularly preferably less than 1.5m, and preferably more than 0.5m, more preferably more than 0.8m, and particularly preferably more than 1m.

[0080] The following details the materials used in each layer of a multilayer interlayer membrane, as well as the materials used in a single-layer interlayer membrane.

[0081] (Thermoplastic resin)

[0082] The intermediate film (each layer) preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (0)), and as thermoplastic resin (0), it preferably contains polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (0)). The first layer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (1)), and as thermoplastic resin (1), it preferably contains polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (1)). The second layer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (2)), and as thermoplastic resin (2), it preferably contains polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (2)). The third layer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (3)), and as thermoplastic resin (3), it preferably contains polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (3)). The thermoplastic resin (1), thermoplastic resin (2), and thermoplastic resin (3) can be the same or different, but from the perspective of further improving sound insulation, it is preferred that the thermoplastic resin (1) is different from the thermoplastic resin (2) and the thermoplastic resin (3). The polyvinyl acetal resin (1), polyvinyl acetal resin (2), and polyvinyl acetal resin (3) can be the same or different, but from the perspective of further improving sound insulation, it is preferred that the polyvinyl acetal resin (1) is different from the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3). The thermoplastic resin (0), thermoplastic resin (1), thermoplastic resin (2), and thermoplastic resin (3) can use only one type or can be combined with two or more types. The polyvinyl acetal resin (0), polyvinyl acetal resin (1), polyvinyl acetal resin (2), and polyvinyl acetal resin (3) can use only one type or can be combined with two or more types.

[0083] Examples of thermoplastic resins include polyvinyl alcohol acetal resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, polyurethane resin, and polyvinyl alcohol resin. Other thermoplastic resins may also be used.

[0084] The thermoplastic resin is preferably polyvinyl acetal resin. By combining polyvinyl acetal resin with a plasticizer, the adhesion of the layer containing polyvinyl acetal resin and plasticizer to laminated glass components or other intermediate layers is further improved.

[0085] The polyvinyl alcohol acetal resin can be manufactured, for example, by acetalizing polyvinyl alcohol (PVA) using an aldehyde. The polyvinyl alcohol acetal resin is preferably an acetalized form of polyvinyl alcohol. The polyvinyl alcohol can be obtained, for example, by saponifying polyvinyl acetate. The degree of saponification of the polyvinyl alcohol is typically 70 to 99.9 mol%.

[0086] The average degree of polymerization of the polyvinyl alcohol (PVA) is preferably 200 or higher, more preferably 500 or higher, even more preferably 1500 or higher, even more preferably 1600 or higher, particularly preferably 2600 or higher, most preferably 2700 or higher, and preferably 5000 or lower, more preferably 4000 or lower, and even more preferably 3500 or lower. If the average degree of polymerization is above the lower limit, the penetration resistance of the laminated glass is further improved. If the average degree of polymerization is below the upper limit, the formation of the interlayer becomes easier.

[0087] The average degree of polymerization of the polyvinyl alcohol was determined according to the method in JIS K6726 "Test Method for Polyvinyl Alcohol".

[0088] The number of carbon atoms in the acetal group of the polyvinyl acetal resin is not particularly limited. The aldehyde used in manufacturing the polyvinyl acetal resin is not particularly limited. The number of carbon atoms in the acetal group of the polyvinyl acetal resin is preferably 3 to 5, more preferably 3 or 4. When the number of carbon atoms in the acetal group of the polyvinyl acetal resin is 3 or more, the glass transition temperature of the intermediate film is sufficiently reduced.

[0089] The aldehyde is not particularly limited. Aldehydes with 1 to 10 carbon atoms are generally suitable. Examples of aldehydes with 1 to 10 carbon atoms include: propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-pentanaldehyde, 2-ethylbutyraldehyde, n-hexanaldehyde, n-octanaldehyde, n-nonanaldehyde, n-decanaldehyde, formaldehyde, acetaldehyde, and benzaldehyde. Propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexanaldehyde, or n-pentanaldehyde are preferred; propionaldehyde, n-butyraldehyde, or isobutyraldehyde are more preferred; and n-butyraldehyde is even more preferred. Only one type of aldehyde may be used, or two or more may be used in combination.

[0090] The hydroxyl content (hydroxyl 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 content is above the lower limit, the adhesive strength of the interlayer is further increased. In addition, when the hydroxyl content is below the upper limit, the flexibility of the interlayer increases, and the processing of the interlayer becomes easier.

[0091] The hydroxyl content (hydroxyl 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, 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 content is above the lower limit, the mechanical strength of the interlayer is further improved. In particular, when the hydroxyl content of the polyvinyl acetal resin (1) is 20 mol% or more, the reaction efficiency is improved and the productivity is excellent, while when it is below 28 mol%, the sound insulation of the laminated glass is further improved. In addition, when the hydroxyl content is below the upper limit, the flexibility of the interlayer is improved, and the processing of the interlayer becomes easier.

[0092] The content of hydroxyl groups in both 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, further preferably 31.5 mol% or more, even more preferably 32 mol% or more, most preferably 33 mol% or more, and 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 content of hydroxyl groups is above the lower limit, the adhesive strength of the interlayer is further improved. In addition, when the content of hydroxyl groups is below the upper limit, the flexibility of the interlayer is improved, and the processing of the interlayer becomes easier.

[0093] From the viewpoint of further improving sound insulation, it is preferable that the hydroxyl content of the polyvinyl acetal resin (1) is lower than that of the polyvinyl acetal resin (2). From the viewpoint of further improving sound insulation, it is preferable that the hydroxyl content of the polyvinyl acetal resin (1) is lower than that of the polyvinyl acetal resin (3). From the viewpoint of further improving sound insulation, the absolute value of the difference between the hydroxyl content of the polyvinyl acetal resin (1) and the hydroxyl content of the polyvinyl acetal resin (2), and the absolute value of the difference between the hydroxyl content of the polyvinyl acetal resin (1) and the hydroxyl content of the polyvinyl acetal resin (3) are preferably 1 mol% or more, more preferably 5 mol% or more, 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 content of the polyvinyl acetal resin (1) and the hydroxyl content of the polyvinyl acetal resin (2), and the absolute value of the difference between the hydroxyl content of the polyvinyl acetal resin (1) and the hydroxyl content of the polyvinyl acetal resin (3) are preferably 20 mol% or less.

[0094] The hydroxyl content of the polyvinyl acetal resin is expressed as a percentage, which represents the mole fraction obtained by dividing the amount of hydroxyl-bonded ethylene by the total amount of ethylene in the main chain. The amount of hydroxyl-bonded ethylene can be determined, for example, according to JIS K6728 "Test Method for Polyvinyl Butyral".

[0095] The degree of acetylation (acetyl group content) 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 preferably 30 mol% or less, more preferably 25 mol% or less, even more preferably 20 mol% or less. If the degree of acetylation is above the lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer is improved. If the degree of acetylation is below the upper limit, the moisture resistance of the interlayer and the laminated glass is improved.

[0096] The degree of acetylation (acetyl group content) 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, and 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. If the degree of acetylation is above the lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer is improved. If the degree of acetylation is below the upper limit, the moisture resistance of the interlayer and the laminated glass is improved. In particular, when the degree of acetylation (acetyl group content) of the polyvinyl acetal resin (1) is 0.1 mol% or more and 25 mol% or less, the penetration resistance is excellent.

[0097] The degree of acetylation of both 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. If the degree of acetylation is above the lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer is improved. If the degree of acetylation is below the upper limit, the moisture resistance of the interlayer and the laminated glass is improved.

[0098] The degree of acetylation is a percentage value, representing the mole fraction obtained by dividing the amount of acetyl-bonded ethylene by the total amount of ethylene in the main chain. The amount of acetyl-bonded ethylene can be determined, for example, according to JIS K6728 "Test Method for Polyvinyl Butyral".

[0099] The degree of acetalization of the polyvinyl acetal resin (0) (in the case of polyvinyl butyral resin, the degree of butyralization) 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. If the degree of acetalization is above or below the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is improved. If the degree of acetalization is below the upper limit, the reaction time required to manufacture the polyvinyl acetal resin is shortened.

[0100] The degree of acetalization of the polyvinyl acetal resin (1) (in the case of polyvinyl butyral resin, the degree of butyralization) is preferably 47 mol% or more, more preferably 60 mol% or more, and preferably 85 mol% or less, more preferably 75 mol% or less. If the degree of acetalization is above or below the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is improved. If the degree of acetalization is below or below the upper limit, the reaction time required to manufacture the polyvinyl acetal resin is shortened.

[0101] The degree of acetalization (or butyralization in the case of polyvinyl butyral resin) of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 55 mol% or more, more preferably 60 mol% or more, and preferably 75 mol% or less, more preferably 71 mol% or less. If the degree of acetalization is above or below the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is improved. If the degree of acetalization is below or below the upper limit, the reaction time required to manufacture the polyvinyl acetal resin is shortened.

[0102] The degree of acetalization is a percentage value, which is the mole fraction obtained by subtracting the amount of ethylene bonded with hydroxyl groups and the amount of ethylene bonded with acetyl groups from the total amount of ethylene in the main chain, and then dividing the result by the total amount of ethylene in the main chain.

[0103] It should be noted that the content of hydroxyl groups (hydroxyl content), degree of acetalization (degree of butyralization), and degree of acetylation are preferably calculated based on the results obtained by determination according to JIS K6728 "Test Method for Polyvinyl Butyral". However, determination according to ASTM D1396-92 may also be used. When the polyvinyl acetal resin is polyvinyl butyral resin, the content of hydroxyl groups (hydroxyl content), degree of acetalization (degree of butyralization), and degree of acetylation can be calculated based on the results obtained by determination according to JIS K6728 "Test Method for Polyvinyl Butyral".

[0104] (Plasticizer)

[0105] From the viewpoint of further improving the adhesive strength of the interlayer, the interlayer of the present invention preferably contains a plasticizer (hereinafter, sometimes referred to as plasticizer (0)). The first layer preferably contains a plasticizer (hereinafter, sometimes referred to as plasticizer (1)). The second layer preferably contains a plasticizer (hereinafter, sometimes referred to as plasticizer (2)). The third layer preferably contains a plasticizer (hereinafter, sometimes referred to as plasticizer (3)). When the thermoplastic resin contained in the interlayer is polyvinyl acetal resin, it is particularly preferred that the interlayer (each layer) contains a plasticizer. Layers containing polyvinyl acetal resin preferably contain a plasticizer.

[0106] The plasticizer is not particularly limited. Conventionally known plasticizers can be used as the plasticizer. Only one type of plasticizer may be used, or two or more may be used in combination.

[0107] Examples of plasticizers include monobasic and polybasic organic esters, as well as organic phosphoric acid plasticizers such as organic phosphoric acid plasticizers and organic phosphorous acid plasticizers. Organic ester plasticizers are preferred. The plasticizer is preferably a liquid plasticizer.

[0108] Examples of monobasic organic acid esters include glycol esters obtained by reacting a glycol with a monobasic organic acid. Examples of glycols include triethylene glycol, tetraethylene glycol, and tripropylene glycol. Examples of monobasic organic acids include butyric acid, isobutyric acid, hexanoic acid, 2-ethylbutyric acid, heptanoic acid, octanoic acid, 2-ethylhexanoic acid, nonanoic acid, and decanoic acid.

[0109] Examples of such polybasic organic acid esters include ester compounds formed from polybasic organic acids and alcohols having a straight-chain or branched structure with 4 to 8 carbon atoms. Examples of such polybasic organic acids include adipic acid, sebacic acid, and azelaic acid.

[0110] Examples of organic ester plasticizers include: triethylene glycol di-2-ethylpropionate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dioctanoate, 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-propanediol di-2-ethylbutyrate, 1,4-butanediol di-2-ethylbutyrate, and diethylene glycol. Di-2-ethylbutyrate, diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylvalerate, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol dioctanoate, dihexyl adipate, dioctyl adipate, hexylcyclohexyl adipate, mixtures of heptyl adipate and nonyl adipate, diisononyl adipate, diisodecyl adipate, heptylnonyl adipate, dibutyl sebacate, oil-modified sebacate, and mixtures of phosphate esters and adipates, etc. Other organic ester plasticizers besides these can also be used. Other adipates besides those mentioned above can also be used.

[0111] Examples of organophosphate plasticizers include tri(butoxyethyl) phosphate, isodecylphenyl phosphate, and triisopropyl phosphate.

[0112] The plasticizer is preferably a diester plasticizer represented by the following formula (1).

[0113] [Chemical Formula 1]

[0114]

[0115] In formula (1), R1 and R2 represent organic groups with 5 to 10 carbon atoms, R3 represents ethylene, isopropylidene, or n-propylidene, and p represents an integer from 3 to 10. In formula (1), R1 and R2 are preferably organic groups with 6 to 10 carbon atoms.

[0116] The plasticizer preferably contains triethylene glycol di-2-ethylhexanoate (3GO) or triethylene glycol di-2-ethylbutyrate (3GH), and more preferably contains triethylene glycol di-2-ethylhexanoate.

[0117] In the interlayer, the content of the plasticizer (0) relative to 100 parts by weight of the thermoplastic resin (0) is preferably 25 parts by weight or more, more preferably 30 parts by weight or more, and 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 of the plasticizer (0) is above the lower limit, the penetration resistance of the laminated glass is further improved. When the content of the plasticizer (0) is below the upper limit, the transparency of the interlayer is further improved.

[0118] The plasticizer (1) is preferably 50 parts by weight or more, more preferably 55 parts by weight or more, further preferably 60 parts by weight or more, and preferably 100 parts by weight or less, more preferably 90 parts by weight or less, further preferably 85 parts by weight or less, and particularly preferably 80 parts by weight or less when the content (1) is above the lower limit, the flexibility of the interlayer is improved, and the processing of the interlayer becomes easier. When the content (1) is below the upper limit, the penetration resistance of the laminated glass is further improved.

[0119] The content of the plasticizer (2) relative to 100 parts by weight of the thermoplastic resin (2) (hereinafter, sometimes referred to as content (2)) and the content of the plasticizer (3) relative to 100 parts by weight of the thermoplastic resin (3) (hereinafter, sometimes referred to as content (3)) are preferably 10 parts by weight or more, more preferably 15 parts by weight or more, further preferably 20 parts by weight or more, particularly preferably 24 parts by weight or more, and preferably 40 parts by weight or less, more preferably 35 parts by weight or less, further preferably 32 parts by weight or less, and particularly preferably 30 parts by weight or less. When the content (2) and the content (3) are above the lower limit, the flexibility of the interlayer is improved, and the processing of the interlayer becomes easier. When the content (2) and the content (3) are below the upper limit, the penetration resistance of the laminated glass is further improved.

[0120] To improve the sound insulation of laminated glass, it is preferable that the content (1) is higher than the content (2), and it is also preferable that the content (1) is higher than the content (3).

[0121] From the viewpoint of further improving the sound insulation of 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 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 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.

[0122] (Insulating compounds)

[0123] The interlayer preferably contains a heat-insulating compound. The first layer preferably contains a heat-insulating compound. The second layer preferably contains a heat-insulating compound. The third layer preferably contains a heat-insulating compound. Only one type of heat-insulating compound may be used, or two or more may be used in combination.

[0124] The heat-insulating compound preferably comprises at least one component X selected from phthalocyanine compounds, naphthalene phthalocyanine compounds, and anthracene phthalocyanine compounds, or comprises heat-insulating particles. In this case, it may also comprise both component X and the heat-insulating particles.

[0125] Ingredient X:

[0126] The intermediate membrane preferably comprises phthalocyanine compounds, naphthyl phthalocyanine compounds, and anthracene phthalocyanine compounds (hereinafter, phthalocyanine compounds, naphthyl phthalocyanine compounds, and anthracene phthalocyanine compounds are sometimes referred to as component X). The first layer preferably comprises component X. The second layer preferably comprises component X. The third layer preferably comprises component X. Component X is a heat-insulating compound. Component X may be used in combination with only one type or in combination with two or more types.

[0127] The ingredient X is not particularly limited. Commonly known phthalocyanine compounds, naphthalene phthalocyanine compounds, and anthracene phthalocyanine compounds may be used as ingredient X.

[0128] As component X, examples include phthalocyanines, phthalocyanine derivatives, naphthyl phthalocyanines, naphthyl phthalocyanine derivatives, anthracene phthalocyanines, and anthracene phthalocyanine derivatives. Preferably, the phthalocyanine compound and the phthalocyanine derivative each have a phthalocyanine skeleton. Preferably, the naphthyl phthalocyanine compound and the naphthyl phthalocyanine derivative each have a naphthyl phthalocyanine skeleton. Preferably, the anthracene phthalocyanine compound and the anthracene phthalocyanine derivative each have an anthracene phthalocyanine skeleton.

[0129] From the viewpoint of further improving the thermal insulation properties of the interlayer and laminated glass, the component X is preferably phthalocyanine, phthalocyanine derivatives, naphthalocyanine and naphthalocyanine derivatives, and more preferably phthalocyanine and phthalocyanine derivatives.

[0130] From the viewpoint of effectively improving thermal insulation and maintaining visible light transmittance at a higher level over a long period, component X preferably contains vanadium atoms or copper atoms. Component X preferably contains vanadium atoms, and even more preferably contains copper atoms. Component X is more preferably a phthalocyanine containing vanadium atoms or copper atoms, and a derivative of phthalocyanine containing vanadium atoms or copper atoms. From the viewpoint of further improving the thermal insulation of the interlayer and laminated glass, component X preferably has structural units in which oxygen atoms are bonded to vanadium atoms.

[0131] In the intermediate film (100% by weight) or in the layers (first layer, second layer, or third layer) containing component X (100% by weight), the content of 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, particularly preferably 0.02% by weight or more, and 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. If the content of component X is above the lower limit and below the upper limit, the heat insulation performance is sufficiently improved, and the visible light transmittance is sufficiently improved. For example, the visible light transmittance can be 70% or more.

[0132] Insulating particles:

[0133] The intermediate film preferably contains heat-insulating particles. The first layer preferably contains the heat-insulating particles. The second layer preferably contains the heat-insulating particles. The third layer preferably contains the heat-insulating particles. The heat-insulating particles are heat-insulating compounds. By using the heat-insulating particles, infrared rays (heat rays) can be effectively blocked. Only one type of heat-insulating particle can be used, or two or more types can be used in combination.

[0134] From the viewpoint of further improving the thermal insulation properties of laminated glass, the thermal insulation particles are more preferably metal oxide particles. The thermal insulation particles are preferably particles formed from metal oxides (metal oxide particles).

[0135] Infrared radiation, with wavelengths longer than visible light (above 780 nm), has lower energy compared to ultraviolet light. However, infrared radiation has a significant thermal effect; when absorbed by matter, it is released as heat. Therefore, infrared radiation is often referred to as heat radiation. Infrared radiation (heat radiation) can be effectively shielded by using the aforementioned heat-insulating particles. It should be noted that heat-insulating particles are particles that can absorb infrared radiation.

[0136] Specific examples of the heat-insulating 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, sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, rubidium-doped 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, or lanthanum hexaboride (LaB6) particles, etc. Other heat-insulating particles may also be used. For higher shielding performance of the heat wire, metal oxide particles are preferred, and ATO particles, GZO particles, IZO particles, ITO particles, or tungsten oxide particles are more preferred, especially ITO particles or tungsten oxide particles. Particularly for higher shielding performance and ease of availability of the heat wire, tin-doped indium oxide particles (ITO particles) are preferred, and tungsten oxide particles are also preferred.

[0137] From the viewpoint of further improving the thermal insulation properties of the interlayer and laminated glass, tungsten oxide particles are preferably tungsten oxide particles doped with metals. The term "tungsten oxide particles" includes tungsten oxide particles doped with metals. Specifically, examples of tungsten oxide particles doped with metals include: sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, and rubidium-doped tungsten oxide particles.

[0138] From the viewpoint of further improving the thermal insulation properties of the interlayer and laminated glass, cesium-doped tungsten oxide particles are particularly preferred. From the viewpoint of further improving the thermal insulation properties of the interlayer and laminated glass, these cesium-doped tungsten oxide particles are preferably derived from the formula: Cs 0.33 WO3 represents tungsten oxide particles.

[0139] The average particle size of the heat-insulating particles is preferably 0.01 μm or more, more preferably 0.02 μm or more, and preferably 0.1 μm or less, more preferably 0.05 μm or less. If the average particle size is above or below the lower limit, the shielding effect of the heat wire is sufficiently improved. If the average particle size is below the upper limit, the dispersibility of the heat-insulating particles is improved.

[0140] The term "average particle size" refers to the volume average particle size. The average particle size can be measured using a particle size distribution measuring device (such as the "UPA-EX150" manufactured by Nikkiso Corporation).

[0141] In the intermediate film (100% by weight) or in the layers (first layer, second layer, or third layer) containing the heat-insulating particles (100% by weight), the content of each heat-insulating particle (particularly the content of tungsten oxide particles) is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, further preferably 1% by weight or more, particularly preferably 1.5% by weight or more, and preferably 6% by weight or less, more preferably 5.5% by weight or less, further preferably 4% by weight or less, particularly preferably 3.5% by weight or less, and most preferably 3.0% by weight or less. If the content of the heat-insulating particles is above the lower limit and below the upper limit, the heat insulation performance is sufficiently improved, and the visible light transmittance is sufficiently improved.

[0142] (metal salt)

[0143] The interlayer preferably comprises an alkali metal salt, an alkaline earth metal salt, and a magnesium salt (hereinafter, sometimes referred to as metal salt M). The interlayer preferably contains an alkali metal derived from metal salt M. The interlayer preferably contains an alkaline earth metal derived from metal salt M. The interlayer preferably contains magnesium derived from metal salt M. The first layer preferably contains metal salt M. The second layer preferably contains metal salt M. The third layer preferably contains metal salt M. By using metal salt M, the adhesion between the interlayer and laminated glass components such as glass plates, or the adhesion between the layers of the interlayer, can be easily controlled. Only one type of metal salt M may be used, or two or more may be used in combination.

[0144] The metal salt M preferably comprises Li, Na, K, Rb, Cs, Mg, Ca, Sr, and Ba. The metal salt contained in the intermediate film preferably comprises K or Mg.

[0145] Furthermore, the metal salt M is more preferably an alkali metal salt of an organic acid with 2 to 16 carbon atoms, an alkaline earth metal salt of an organic acid with 2 to 16 carbon atoms, or a magnesium salt of an organic acid with 2 to 16 carbon atoms, and even more preferably a magnesium salt of a carboxylic acid with 2 to 16 carbon atoms or a potassium salt of a carboxylic acid with 2 to 16 carbon atoms.

[0146] There are no particular limitations on the magnesium carboxylate salts and potassium carboxylate salts with 2 to 16 carbon atoms, and examples include: magnesium acetate, potassium acetate, magnesium propionate, potassium propionate, magnesium 2-ethylbutyrate, potassium 2-ethylbutyrate, magnesium 2-ethylhexanoate, and potassium 2-ethylhexanoate.

[0147] The total content of Mg and K in the intermediate film containing the metal salt M or in the layers (first layer, second layer, or third 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 preferably 300 ppm or less, more preferably 250 ppm or less, and even more preferably 200 ppm or less. If the total content of Mg and K is above the lower limit and below the upper limit, the adhesion between the intermediate film and laminated glass components such as the glass plate, or the adhesion between the layers in the intermediate film, can be controlled better.

[0148] (UV shielding agent)

[0149] The interlayer preferably contains an ultraviolet (UV) shielding agent. The first layer preferably contains an UV shielding agent. The second layer preferably contains an UV shielding agent. The third layer preferably contains an UV shielding agent. By using UV shielding agents, the visible light transmittance is less likely to decrease even after long-term use of the interlayer and laminated glass. Only one type of UV shielding agent may be used, or two or more may be used in combination.

[0150] The ultraviolet shielding agent includes an ultraviolet absorber. Preferably, the ultraviolet shielding agent is an ultraviolet absorber.

[0151] Examples of such ultraviolet shielding agents include: ultraviolet shielding agents containing metal atoms, ultraviolet shielding agents containing metal oxides, ultraviolet shielding agents having a benzotriazole structure (benzotriazole compounds), ultraviolet shielding agents having a benzophenone structure (benzophenone compounds), ultraviolet shielding agents having a triazine structure (triazine compounds), ultraviolet shielding agents having a malonic acid ester structure (malonic acid ester compounds), ultraviolet shielding agents having an oxalic acid aniline structure (oxalic acid aniline compounds), and ultraviolet shielding agents having a benzoic acid ester structure (benzoic acid ester compounds), etc.

[0152] Examples of ultraviolet-shielding agents containing the aforementioned metal atoms include: platinum particles, particles obtained by coating the surface of platinum particles with silica, palladium particles, and particles obtained by coating the surface of palladium particles with silica. The ultraviolet-shielding agent is preferably not a heat-insulating particle.

[0153] 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 benzoic acid ester structure; more preferably an ultraviolet shielding agent having a benzotriazole structure or an ultraviolet shielding agent having a benzophenone structure; and even more preferably an ultraviolet shielding agent having a benzotriazole structure.

[0154] Examples of ultraviolet shielding agents containing the aforementioned metal oxides include zinc oxide, titanium oxide, and cerium oxide. Furthermore, the surface of the ultraviolet shielding agent containing the aforementioned metal oxide can also be coated. Examples of surface coating materials for ultraviolet shielding agents containing the aforementioned metal oxides include insulating metal oxides, hydrolyzable organosilicon compounds, and polysiloxane compounds.

[0155] Examples of insulating metal oxides include silicon dioxide, aluminum oxide, and zirconium oxide. The band gap energy of such insulating metal oxides is, for example, 5.0 eV or higher.

[0156] Examples of UV shielding agents having the benzotriazole structure include: 2-(2'-hydroxy-5'-methylphenyl)benzotriazole ("Tinuvin P" manufactured by BASF), 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole ("Tinuvin 320" manufactured by BASF), 2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole ("Tinuvin 326" manufactured by BASF), and 2-(2'-hydroxy-3',5'-dipentylphenyl)benzotriazole ("Tinuvin 328" manufactured by BASF). In terms of superior UV absorption performance, the UV shielding agent preferably has a benzotriazole structure containing a halogen atom, and more preferably has a benzotriazole structure containing a chlorine atom.

[0157] Examples of ultraviolet shielding agents having the aforementioned benzophenone structure include octanophenone (BASF's "Chimassorb 81").

[0158] Examples of ultraviolet shielding agents having the aforementioned triazine structure include "LA-F70" manufactured by ADEKA and 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol ("Tinuvin 1577FF" manufactured by BASF).

[0159] Examples of UV shielding agents having the malonic acid ester structure include: dimethyl 2-(p-methoxybenzyl)malonate, tetraethyl 2,2-(1,4-phenylenedimethyl)bis(malonate), and 2-(p-methoxybenzyl)bis(1,2,2,6,6-pentamethyl-4-piperidinyl)malonate.

[0160] Commercially available UV shielding agents having the aforementioned malonic acid ester structure include: Hostavin B-CAP, Hostavin PR-25, and Hostavin PR-31 (all manufactured by Clariant).

[0161] Examples of ultraviolet shielding agents having the oxalic acid aniline structure include: N-(2-ethylphenyl)-N'-(2-ethoxy-5-tert-butylphenyl) oxalic acid diamide, N-(2-ethylphenyl)-N'-(2-ethoxy-phenyl) oxalic acid diamide, and 2-ethyl-2'-ethoxy-oxalylaniline (Sanduvor VSU manufactured by Clariant), which are oxalic acid diamines having substituted aryl groups on the nitrogen atom.

[0162] Examples of UV shielding agents having the benzoic acid ester structure include 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoic acid ester ("Tinuvin 120" manufactured by BASF).

[0163] From the viewpoint of further suppressing the decrease in visible light transmittance over time, the content of the ultraviolet shielding agent in 100% by weight of the interlayer or in 100% by weight of the layers (first layer, second layer, or third layer) containing the ultraviolet shielding agent is preferably 0.1% by weight or more, more preferably 0.2% by weight or more, further preferably 0.3% by weight or more, particularly preferably 0.5% by weight or more, and preferably 2.5% by weight or less, more preferably 2% by weight or less, further preferably 1% by weight or less, and particularly preferably 0.8% by weight or less. In particular, by making the content of the ultraviolet shielding agent in 100% by weight of the layers containing the ultraviolet shielding agent 0.2% by weight or more, the decrease in visible light transmittance of the interlayer and the laminated glass over time can be significantly suppressed.

[0164] (Antioxidants)

[0165] The intermediate membrane 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. Only one type of antioxidant may be used, or two or more may be used in combination.

[0166] Examples of antioxidants include phenolic antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants. Phenolic antioxidants are antioxidants with a phenolic skeleton. Sulfur-based antioxidants are antioxidants containing sulfur atoms. Phosphorus-based antioxidants are antioxidants containing phosphorus atoms.

[0167] The antioxidant is preferably a phenolic antioxidant or a phosphorus antioxidant.

[0168] Examples of phenolic antioxidants include: 2,6-di-tert-butyl-p-cresol (BHT), butylated hydroxyanisole (BHA), 2,6-di-tert-butyl-4-ethylphenol, stearyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 2,2'-methylenebis-(4-methyl-6-butylphenol), 2,2'-methylenebis-(4-ethyl-6-tert-butylphenol), 4,4'-butylenebis-(3-methyl-6-tert-butylphenol), 1,1,3-tri-( 2-Methyl-hydroxy-5-tert-butylphenyl)butane, tetra[methylene-3-(3',5'-butyl-4-hydroxyphenyl)propionate]methane, 1,3,3-tris-(2-methyl-4-hydroxy-5-tert-butylphenol)butane, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, ethylene glycol bis(3,3'-tert-butylphenol)butyrate, and bis(3-tert-butyl-4-hydroxy-5-methylphenylpropionate)ethylene bis(oxyethylene) ester, etc. One or more of these antioxidants may be preferred.

[0169] Examples of phosphorus-based antioxidants include tridecyl phosphite, tri(tetranyl) phosphite, triphenyl phosphite, tri(nonylphenyl) phosphite, pentaerythritol didecyl phosphite, pentaerythritol didecyl phosphite, tris(2,4-di-tert-butylphenyl) phosphite, ethyl bis(2,4-di-tert-butyl-6-methylphenyl) phosphite, and 2,2'-methylenebis(4,6-di-tert-butyl-1-phenoxy)(2-ethylhexyloxy)phosphite. It is suitable to use one or more of these antioxidants.

[0170] Examples of phosphorus-based antioxidants include: tridecyl phosphite, tri(tetranyl) phosphite, triphenyl phosphite, tri(nonylphenyl) phosphite, bis(tetranyl)pentaerythritol diphosphite, bis(decyl)pentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, bis(2,4-di-tert-butyl-6-methylphenyl)ethyl phosphite, and 2,2'-methylenebis(4,6-di-tert-butyl-1-phenoxy)(2-ethylhexyloxy)phosphite. One or more of these antioxidants may be preferred.

[0171] Commercially available examples of the aforementioned antioxidants include, for example, BASF's "IRGANOX 245", BASF's "IRGAFOS 168", BASF's "IRGAFOS 38", Sumitomo Chemical Co., Ltd.'s "Sumilizer BHT", Sakai Chemical Co., Ltd.'s "H-BHT", and BASF's "IRGANOX 1010".

[0172] To maintain high visible light transmittance of the interlayer and laminated glass over the long term, the antioxidant content in 100% by weight of the interlayer or in 100% by weight of the layers containing the antioxidant (first layer, second layer, or third layer) is preferably 0.1% by weight or more. Furthermore, since the effect of added antioxidants can become saturated, the antioxidant content in 100% by weight of the interlayer or in 100% by weight of the layers containing the antioxidant is preferably 2% by weight or less.

[0173] (Other ingredients)

[0174] The first, second, and third layers may also contain additives such as coupling agents, dispersants, surfactants, flame retardants, antistatic agents, pigments, dyes, moisture-resistant agents, fluorescent whitening agents, and infrared absorbers, as needed. Only one of these additives may be used, or two or more may be used in combination.

[0175] (Laminated glass)

[0176] Figure 3 It means that it was used. Figure 1 A cross-sectional view of an example of laminated glass with an interlayer film is shown.

[0177] Figure 3 The laminated glass 21 shown includes an interlayer 11, a first laminated glass component 22, and a second laminated glass component 23. The interlayer 11 is sandwiched between the first laminated glass component 22 and the second laminated glass component 23. The first laminated glass component 22 is disposed on a first surface of the interlayer 11. The second laminated glass component 23 is disposed on a second surface of the interlayer 11 opposite to the first surface.

[0178] Examples of laminated glass components include glass sheets and PET (polyethylene terephthalate) films. The laminated glass includes not only laminated glass formed by sandwiching an interlayer film between two glass sheets, but also laminated glass formed by sandwiching an interlayer film between a glass sheet and a PET film, etc. The laminated glass is preferably a laminate containing glass sheets, and uses at least one glass sheet. The first and second laminated glass components are preferably glass sheets or PET (polyethylene terephthalate) films, respectively, and the interlayer film comprises at least one glass sheet as both the first and second laminated glass components. It is particularly preferred that both the first and second laminated glass components are glass sheets.

[0179] Examples of glass plates include inorganic glass and plexiglass. Examples of inorganic glass include float glass, heat-absorbing glass, heat-reflecting glass, polished glass, patterned glass, wired glass, and green glass. Plexiglass is a synthetic resin glass used in place of inorganic glass. Examples of plexiglass include polycarbonate sheets and poly(meth)acrylic resin sheets. Examples of poly(meth)acrylic resin sheets include polymethyl methacrylate sheets.

[0180] The thickness of the first and second laminated glass components is not particularly limited, but is preferably 1 mm or more, and more preferably 5 mm or less. When the laminated glass component is a glass sheet, the thickness of the glass sheet is preferably 1 mm or more, and more preferably 5 mm or less. When the laminated glass component is a PET film, the thickness of the PET film is preferably 0.03 mm or more, and more preferably 0.5 mm or less.

[0181] The manufacturing method of the laminated glass is not particularly limited. For example, the interlayer film is sandwiched between the first and second laminated glass components, and then passed through a pressure roller or placed in a rubber bag for depressurization and suction. This removes the air remaining between the first laminated glass component and the interlayer film, and between the second laminated glass component and the interlayer film. Subsequently, pre-bonding is performed at approximately 70-110°C to obtain a laminate. Next, the laminate is placed in an autoclave or pressed, and then pressed together at approximately 120-150°C and a pressure of 1-1.5 MPa. This yields laminated glass.

[0182] The laminated glass can be used in automobiles, rail vehicles, aircraft, ships, and buildings. Preferably, it is for architectural or automotive applications, more preferably for automotive use. It can also be used for other applications. The laminated glass can be used for windshields, side windows, rear windows, or sunroofs in automobiles. Due to its high thermal insulation and high visible light transmittance, it is particularly preferred for automotive applications.

[0183] The laminated glass is used as a head-up display (HUD). Within this laminated glass, measurement information such as speed, sent from the control unit, can be projected from the instrument panel display unit onto the windshield. Therefore, the driver can simultaneously observe the forward view and the measurement information without lowering their gaze.

[0184] The present invention will be further described in detail below with reference to the embodiments disclosed. The present invention is not limited to these embodiments.

[0185] The polyvinyl alcohol acetal resin used was acetalized with n-butyral, which has four carbon atoms. The degree of acetalization (degree of butyralization), degree of acetylation, and hydroxyl content of the polyvinyl alcohol acetal resin were determined according to JIS K6728, "Test Method for Polyvinyl Alcohol Butyral". It should be noted that when measured according to ASTM D1396-92, the same values ​​as those obtained according to JIS K6728 were also observed.

[0186] (Example 1)

[0187] Preparation of compositions for forming intermediate films:

[0188] In 100 parts by weight of polyvinyl acetal resin (average degree of polymerization 1700, hydroxyl content 30.5 mol%, degree of acetylation 1 mol%, degree of acetalization 68.5 mol%), 40 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO), 0.2 parts by weight of Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, "Tinuvin 326" manufactured by BASF), and 0.2 parts by weight of BHT (2,6-di-tert-butyl-tert-p-cresol) were added, and the mixture was thoroughly kneaded with a mixing roller to obtain a composition for forming an intermediate film.

[0189] Preparation of the intermediate membrane:

[0190] The composition for forming an intermediate film is obtained by extrusion using an extruder. In Example 1, the intermediate film is extruded to prepare a wedge-shaped monolayer intermediate film. The resulting intermediate film has a minimum thickness at one end and a maximum thickness at the other end. Furthermore, the resulting intermediate film has the aforementioned corresponding area in the region between 10 cm from one end to the other and 59.8 cm from one end to the other.

[0191] (Example 2 and Comparative Examples 1-2)

[0192] Except for using a different metal mold than in Example 1 to extrude the interlayer film, and setting the wedge angle of the corresponding display area, the wedge angle of the area located on the other side of the display area, and the thickness variation of the corresponding display area as shown in Table 1 below, the interlayer film for laminated glass is obtained in the same manner as in Example 1.

[0193] (Example 3)

[0194] Preparation of the composition for forming the first layer:

[0195] To 100 parts by weight of polyvinyl acetal resin (average degree of polymerization 3000, hydroxyl content 22 mol%, degree of acetylation 13 mol%, degree of acetalization 65 mol%), 60 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO), 0.2 parts by weight of Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, "Tinuvin 326" manufactured by BASF), and 0.2 parts by weight of BHT (2,6-di-tert-butyl-tert-p-cresol) were added, and the mixture was thoroughly kneaded with a mixing roller to obtain the composition for forming the first layer.

[0196] Preparation of compositions for forming the second and third layers

[0197] To 100 parts by weight of polyvinyl acetal resin (average degree of polymerization 1700, hydroxyl content 30.5 mol%, degree of acetylation 1 mol%, degree of acetalization 68.5 mol%), 38 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO), 0.2 parts by weight of Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, "Tinuvin 326" manufactured by BASF), and 0.2 parts by weight of BHT (2,6-di-tert-butyl-tert-p-cresol) were added and thoroughly mixed with a mixing roller to obtain a composition for forming the second and third layers.

[0198] Preparation of the intermediate membrane:

[0199] The composition for forming the first layer and the compositions for forming the second and third layers were co-extruded using a co-extruder. A wedge-shaped intermediate film with a stacked structure of second / first / third layers was prepared. The resulting intermediate film has a minimum thickness at one end and a maximum thickness at the other end. Furthermore, the resulting intermediate film has the aforementioned corresponding region in the area between 10 cm from one end to the other and 59.8 cm from one end to the other.

[0200] (Examples 4-8 and Comparative Examples 3-6)

[0201] Except for using a different metal mold than in Example 1 to extrude the intermediate film, and setting the wedge angle of the corresponding display area, the wedge angle of the area located on the other side of the display area, and the thickness variation of the corresponding display area as shown in Tables 2 and 3 below, the intermediate film for laminated glass is obtained in the same manner as in Example 3.

[0202] (evaluate)

[0203] (0) Thickness

[0204] In the obtained intermediate film, positions are selected every 2 mm from 14 cm to 55.8 cm from one end. The thickness variation within a distance of 80 mm connecting the two ends is measured at each selected position. The maximum and minimum values ​​of the thickness variation are evaluated. The absolute value of the difference between the maximum and minimum thickness variations is calculated.

[0205] (1) Ghost image

[0206] Prepare a pair of glass plates (clear glass, 510mm × 910mm, 2.0mm thick). A membrane with dimensions corresponding to the glass plate dimensions is sandwiched between the two glass plates to obtain a laminate. For example... Figure 5 As shown, the obtained laminate is inserted into an EPDM rubber tube (frame component). The rubber tube is 15 mm wide. Then, the laminate inserted into the EPDM rubber tube is pre-pressed using a vacuum bag method. The pre-pressed laminate is then pressed using an autoclave at 150°C and 1.2 MPa to obtain laminated glass.

[0207] The resulting laminated glass is installed at the windshield position. A display unit positioned below the laminated glass reflects display information onto the glass, and the presence of reflected ghosting images is visually confirmed at a designated location. Furthermore, by illuminating a light source from a distance of 7m on the opposite side of the display area of ​​the laminated glass, the presence of transmitted ghosting images is visually confirmed. Reflected ghosting images in the display area of ​​the laminated glass (the area corresponding to the display of the interlayer film) and transmitted ghosting images in the area further away from the display area of ​​the laminated glass (the area further away from the display of the interlayer film) are determined according to the following criteria.

[0208] [Criteria for determining ghosting in reflection images]

[0209] ○: No reflected ghosting image detected.

[0210] ×: The reflected ghost image has been confirmed.

[0211] [Criteria for determining transmission ghost images]

[0212] ○: No transmission ghosting image confirmed.

[0213] ×: Transmission ghosting image confirmed.

[0214] The details and results are shown in Tables 1-3 below.

[0215] [Table 1]

[0216]

[0217] [Table 2]

[0218]

[0219] [Table 3]

[0220]

[0221] It should be noted that the results of evaluating the sound insulation performance of laminated glass using the interlayer film obtained in Examples 3 to 8 by measuring sound propagation loss confirmed its excellent sound insulation performance.

[0222] Symbol Explanation

[0223] 1, 1A... First Floor

[0224] 1Aa···The portion with a rectangular cross-sectional shape in the thickness direction

[0225] 1Ab··· The section with a wedge-shaped cross-section in the thickness direction

[0226] 2...Second layer

[0227] 3···Third layer

[0228] 11, 11A...intermediate membrane

[0229] 11a···One end

[0230] 11b...the other end

[0231] 11Aa···The portion with a rectangular cross-sectional shape in the thickness direction

[0232] 11Ab··· The section with a wedge-shaped cross-section in the thickness direction

[0233] 21···Laminated Glass

[0234] 22···First laminated glass component

[0235] 23···Second laminated glass component

[0236] 51···Volume

[0237] 61··· Roll Core

[0238] R1... displays the corresponding area.

[0239] R2···Surrounding Area

[0240] R3···Shading area

Claims

1. An interlayer for laminated glass, used as laminated glass in a head-up display. The interlayer film of the laminated glass has a display corresponding area that corresponds to the display area of ​​the head-up display. The interlayer film for the laminated glass has one end and another end located on the opposite side of the first end, and the thickness of the other end is greater than the thickness of the first end. When measuring the following thickness change, the absolute value of the difference between the maximum and minimum measured thickness change values ​​is less than 32 μm. The thickness change is defined as the change in thickness over a distance of 80 mm from one end to the other end, centered at 2 mm intervals along the corresponding display area. The wedge angle of the region located on the other end side, which is further than the display corresponding region, is smaller than the wedge angle of the display corresponding region.

2. The interlayer film for laminated glass as described in claim 1, wherein, The wedge angle of the region located further to the other end than the corresponding display area is more than 0.05 mrad smaller than the wedge angle of the corresponding display area.

3. The interlayer film for laminated glass as described in claim 1 or 2, wherein, The display area is located within a region extending from 10 cm from one end toward the other end to 59.8 cm from one end toward the other end.

4. The interlayer for laminated glass as described in any one of claims 1 to 3, wherein, The wedge angle of the region located on the other end side, which is further than the corresponding display area, is less than 0.7 mrad.

5. The interlayer for laminated glass as described in claim 4, wherein, The wedge angle of the region located on the other end side, which is further than the corresponding display area, is less than 0.5 mrad.

6. The interlayer film for laminated glass as described in claim 5, wherein, The wedge angle of the region located on the other end side, which is further than the corresponding display area, is less than 0.3 mrad.

7. The interlayer for laminated glass as described in claim 6, wherein, The wedge angle of the region located on the other end side, which is further than the corresponding display area, is less than 0.1 mrad.

8. The interlayer for laminated glass according to any one of claims 1 to 7, wherein it contains a thermoplastic resin.

9. The interlayer for laminated glass as described in any one of claims 1 to 8, wherein it contains a plasticizer.

10. The interlayer for laminated glass as claimed in any one of claims 1 to 9, comprising a first layer and a second layer disposed on a first surface side of the first layer.

11. The interlayer for laminated glass as described in claim 10, wherein, The first layer contains polyvinyl acetal resin. The second layer contains polyvinyl acetal resin. The hydroxyl content of the polyvinyl acetal resin in the first layer is lower than that of the polyvinyl acetal resin in the second layer.

12. The interlayer for laminated glass as described in claim 10 or 11, wherein, The first layer contains polyvinyl acetal resin. The second layer contains polyvinyl acetal resin. The first layer contains plasticizer. The second layer contains plasticizers. The content of the plasticizer in the first layer relative to 100 parts by weight of the polyvinyl acetal resin in the first layer is higher than the content of the plasticizer in the second layer relative to 100 parts by weight of the polyvinyl acetal resin in the second layer.

13. A laminated glass having: First laminated glass component, The second laminated glass component, and Interlayer for laminated glass according to any one of claims 1 to 12, An interlayer film for the laminated glass is disposed between the first laminated glass component and the second laminated glass component.

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