Intermediate film for laminated glass, laminated glass, and method for producing same

Abstract

An intermediate film (10) for laminated glass, which has an in-vehicle sensor region (11), and which is characterized in that the maximum amount of deviation of a local wedge angle in the in-vehicle sensor region (11) from an approximate straight line (L1) of the local wedge angle is 0.2 mrad or less.

Description

Technical Field

[0001] The present invention relates to an intermediate film for laminated glass used in laminated glass. Background Art

[0002] Laminated glass is widely used in window glass for automobiles and other vehicles because it is safer because even if it is broken by external impact, less glass fragments are scattered. Laminated glass is widely known as a laminated glass obtained by integrating an interlayer film for laminated glass containing a resin component such as polyvinyl acetal resin between a pair of glasses.

[0003] In recent years, a head-up display (HUD) has been gradually introduced, which displays specific information in the field of vision of the driver, etc. by reflecting images on the windshield of the vehicle or other window glass. The image displayed in the HUD is sometimes seen as a double image (so-called reflected double image) because the light emitted from the light source of the HUD is reflected on the inner surface and the outer surface of the windshield.

[0004] Conventionally, it is known that an interlayer film for laminated glass is formed into a wedge-shaped interlayer film having a specific wedge angle for the purpose of reducing reflected double images. In laminated glass having a wedge-shaped interlayer film, various improvements have been made to reduce reflected double images. For example, it is known that the wedge angle is changed according to the position in the thickness direction in the HUD image area of ​​the front windshield where the HUD image is displayed (for example, refer to Patent Document 1).

[0005] Furthermore, in recent years, the rate of vehicle-mounted sensors has been increasing in order to improve safety or autonomous driving. Vehicle-mounted sensors generally capture images of the front of the vehicle through the front windshield.

[0006] [Prior art literature]

[0007] [Patent Document]

[0008] Patent Document 1: Japanese Patent Application No. 2017-502124 Summary of the invention

[0009] Problems to be solved by the invention

[0010] Sometimes, part of the light guided from the outside of the vehicle to the on-board sensor is not reflected by the outer and inner surfaces of the windshield glass but refracted before entering the on-board sensor, while part of the light is reflected by the inner and outer surfaces of the windshield glass before entering the on-board sensor, thereby detecting a double image (so-called transmission double image), which reduces the detection accuracy. However, in the past, research on the prevention of transmission double image detected by the on-board sensor has not been fully conducted for the interlayer film of laminated glass.

[0011] The present invention has been made in view of the above problems, and an object of the present invention is to provide an interlayer film for laminated glass that can reduce double images or the like detected by an on-vehicle sensor and improve the detection accuracy of the on-vehicle sensor.

[0012] Technical means to solve the problem

[0013] The present inventors have conducted intensive research and have found that the above-mentioned problems can be solved by setting the maximum deviation of the local wedge angle from the local wedge angle approximation straight line L1 to a certain value or less in the vehicle-mounted sensor region or in the region (region A) generally assumed to be the vehicle-mounted sensor region when laminated glass is manufactured, thereby completing the following invention. That is, the present invention provides the following [1] to

[25] .

[0014] [1] An interlayer film for laminated glass, comprising a vehicle-mounted sensor region, and

[0015] The maximum deviation of the local wedge angle from the approximate straight line L1 of the local wedge angle in the on-vehicle sensor region is 0.2 mrad or less.

[0016] [2] An interlayer film for laminated glass, having a length from one end to the other end of 740 mm or more, and

[0017] The maximum deviation of the local wedge angle from the approximate straight line L1 of the local wedge angle in a region A of 100 to 200 mm in a range of 600 to 1000 mm from the one end toward the other end is 0.2 mrad or less.

[0018] [3] The interlayer film for laminated glass according to [1] or [2], wherein the slope of the approximate straight line L1 is 0.7 mrad / 100 mm or less.

[0019] [4] The interlayer film for laminated glass as described in any one of [1] to [3] above, wherein the average value of the local wedge angles in the vehicle-mounted sensor region or the region A is 0.1 mrad or more.

[0020] [5] The interlayer film for laminated glass as described in any one of [1] to [4] above, wherein the average value of the local wedge angle in the vehicle-mounted sensor region or the region A is greater than or equal to -0.05 mrad and less than 0.05 mrad.

[0021] [6] The interlayer film for laminated glass as described in any one of [1] to [5] above, wherein the average value of the local wedge angles in the vehicle-mounted sensor region or the region A is less than -0.1 mrad.

[0022] [7] The interlayer film for laminated glass as described in any one of [1] to [6] above, wherein the interlayer film has a portion where the wedge angle changes locally in the region outside the vehicle-mounted sensor region or the region outside the region A.

[0023] [8] The interlayer film for laminated glass as described in any one of [1] and [3] to [7] above, which has a HUD display area,

[0024] There is a portion outside the HUD display area where the local wedge angle changes.

[0025] [9] The interlayer film for laminated glass as described in any one of [2] to [7] above, has a portion where the wedge angle changes locally outside a region B having a size of 200 to 500 mm in a range of 100 to 600 mm from the one end toward the other end.

[0026]

[10] The interlayer film for laminated glass as described in any one of [1] and [3] to [8] above, which has a HUD display area,

[0027] An absolute value of a difference between an average value of local wedge angles in the HUD display region and an average value of local wedge angles in the onboard sensor region is greater than or equal to 0.01 mrad.

[0028]

[11] In the interlayer film for laminated glass as described in any one of [2] to [7] and [9] above, the absolute value of the difference between the average value of the local wedge angle in the region B having a size of 200 to 500 mm in the range of 100 to 600 mm from the one end toward the other end and the average value of the local wedge angle in the region A is greater than 0.01 mrad.

[0029]

[12] The interlayer film for laminated glass as described in any one of [1], [3] to [8] and

[10] above, which has a HUD display area.

[0030] In the above-mentioned HUD display area, an area is selected within a range of 50 mm toward one end and the other end with each point as the center, and an approximate straight line of the local wedge angle in the area is used as an approximate straight line L2 of the local wedge angle of each point. The above-mentioned HUD display area has a portion where the absolute value of the slope of the above-mentioned approximate straight line L2 is less than 0.005 mrad / 100 mm.

[0031]

[13] The interlayer film for laminated glass as described in any one of [2] to [7], [9] and

[11] above, wherein in a region B having a size of 200 to 500 mm in a range of 100 to 600 mm from the one end toward the other end, an area is selected within a range of 50 mm in the one end direction and the other end direction with each point as the center, and an approximate straight line of the local wedge angle in the region is used as an approximate straight line L2 of the local wedge angle at each point, and the region B has a portion where the absolute value of the slope of the approximate straight line L2 is less than 0.005 mrad / 100 mm.

[0032]

[14] The interlayer film for laminated glass as described in any one of [1], [3] to [8],

[10] and

[12] above, which has a HUD display area.

[0033] In the above-mentioned HUD display area, an area is selected in a range of 50 mm toward one end and the other end with each point as the center, and an approximate straight line of the local wedge angle in the area is used as an approximate straight line L2 of the local wedge angle of each point. The above-mentioned HUD display area has a portion where the slope of the above-mentioned approximate straight line L2 is less than -0.005mrad / 100mm.

[0034]

[15] The interlayer film for laminated glass as described in any one of [2] to [7], [9],

[11] and

[13] above, wherein in a region B having a size of 200 to 500 mm in a range of 100 to 600 mm from the one end toward the other end, an area is selected within a range of 50 mm in the one end direction and the other end direction with each point as the center, and an approximate straight line of the local wedge angle in the region is used as an approximate straight line L2 of the local wedge angle at each point, and the region B has a portion where the slope of the approximate straight line L2 is less than -0.005 mrad / 100 mm.

[0035]

[16] The interlayer film for laminated glass as described in any one of [1] to

[15] above, wherein the approximate straight line L4 of the local wedge angle of the entire interlayer film from the one end to the other end has a positive or negative slope.

[0036]

[17] The interlayer film for laminated glass as described in any one of [1], [3] to [8],

[10] ,

[12] ,

[14] and

[16] above, which has a HUD display area.

[0037] In the HUD display area, an area is selected within a range of 50 mm in one direction and in the other direction with each point as the center, and an approximate straight line of the local wedge angle in the area is used as an approximate straight line L2 of the local wedge angle of each point. The maximum value of the absolute value of the difference between the local wedge angle and the approximate straight line L2 of the above-mentioned points is less than 0.2 mrad.

[0038]

[18] The interlayer film for laminated glass as described in any one of [2] to [7], [9],

[11] ,

[13] ,

[15] and

[16] above, wherein in a region B having a size of 200 to 500 mm in a range of 100 to 600 mm from the one end toward the other end, an area is selected within a range of 50 mm in the one end direction and the other end direction with each point as the center, and an approximate straight line of the local wedge angle in the region is used as an approximate straight line L2 of the local wedge angle at each point, and the maximum value of the absolute value of the difference between the local wedge angle and the approximate straight line L2 at each point is not more than 0.2 mrad.

[0039]

[19] The interlayer film for laminated glass as described in any one of [1], [3] to [8],

[10] ,

[12] ,

[14] ,

[16] and

[17] above, which does not have a HUD display area.

[0040] The average value of the local wedge angle of the region from one end toward the other end of the interlayer film for laminated glass to the onboard sensor region differs from the average value of the local wedge angle of the onboard sensor region by 0.001 mrad or more.

[0041]

[20] The interlayer film for laminated glass as described in any one of [1] to

[19] above, which has a colored region having a visible light transmittance of less than 60%,

[0042] The average value of the local wedge angles of the colored region is 0.6 mrad or less.

[0043]

[21] The intermediate film for laminated glass as described in any one of [1] to

[20] above, wherein on at least one surface, the ten-point average roughness (Rzjis94) is greater than 1 μm and less than 100 μm, and the absolute value of the difference between the maximum and minimum values ​​of the ten-point average roughness is less than 40 μm.

[0044]

[22] A laminated glass comprising the interlayer film for laminated glass as described in any one of [1] to

[21] above, a first laminated glass component and a second laminated glass component, wherein the interlayer film for laminated glass is arranged between the first laminated glass component and the second laminated glass component.

[0045]

[23] In the laminated glass as described in

[22] above, the thicknesses of the first and second laminated glass components are different from each other and differ by at least 0.1 mm.

[0046]

[24] A method for producing an interlayer film for laminated glass, which is the method for producing an interlayer film for laminated glass according to any one of [1] to

[21] , wherein the interlayer film for laminated glass is molded by extrusion molding.

[0047]

[25] A method for producing laminated glass, which is the method for producing laminated glass described in

[22] or

[23] above, wherein the interlayer film for laminated glass is sandwiched between two laminated glass components and these are press-bonded to obtain the laminated glass.

[0048] Effects of the Invention

[0049] According to the interlayer film for laminated glass of the present invention, double images and the like detected by an on-vehicle sensor can be reduced, and the detection accuracy of the on-vehicle sensor can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] [ Figure 1 ] is a schematic front view showing an example of an intermediate film for laminated glass according to the first embodiment.

[0051] [ Figure 2 ] is a schematic partial cross-sectional view showing an example of an intermediate film for laminated glass when applied to laminated glass, the lower side is one end side, and the upper side is the other end side.

[0052] [ Figure 3 ] is a diagram showing the relationship between the design curve DP, the measured curve AP and the approximate straight line L1 in the vehicle-mounted sensor area.

[0053] [ Figure 4 ] is a diagram showing the relationship between the design curve DP, the measured curve AP and the approximate straight line L2 in the HUD display area.

[0054] [ Figure 5 ] is a schematic diagram used to illustrate the calculation method of the wedge angle at each longitudinal position.

[0055] [ Figure 6 ] is a schematic diagram for illustrating a method for calculating the approximate straight line L2.

[0056] [ Figure 7 ] is a schematic front view showing an example of an intermediate film for laminated glass according to the first embodiment.

[0057] [ Figure 8 ] is a schematic front view showing an example of an intermediate film for laminated glass according to the first embodiment.

[0058] [ Fig. 9 ] is a schematic front view showing an example of an intermediate film for laminated glass according to the first embodiment.

[0059] [ Fig.10 ] is a schematic front view showing an example of an intermediate film for laminated glass according to the first embodiment.

[0060] [ Fig.11] is a schematic cross-sectional view showing an example of an intermediate film for laminated glass when applied to laminated glass.

[0061] [ Fig.12 ] is a schematic cross-sectional view showing an example of an intermediate film for laminated glass when applied to laminated glass.

[0062] [ Fig.13 ] is a schematic front view showing an example of an intermediate film for laminated glass according to the second embodiment.

[0063] [ Fig.14 ] is a diagram showing the overall design curve of the laminated glass interlayer.

[0064] [ Fig.15 ] is a diagram showing the overall design curve of the laminated glass interlayer.

[0065] [ Fig.16 ] is a diagram showing the overall design curve of the laminated glass interlayer.

[0066] [ Fig.17 ] is a diagram showing the overall design curve of the laminated glass interlayer. DETAILED DESCRIPTION

[0067] In the following description, the interlayer film for laminated glass is applied to the front windshield of an automobile, but the interlayer film for laminated glass can also be applied to other than the front windshield of an automobile as described below.

[0068] <First embodiment>

[0069] Figure 1 The interlayer film for laminated glass of the first embodiment is schematically shown. In this embodiment, an example of the case where the interlayer film for laminated glass (hereinafter, sometimes referred to as "interlayer film") 10 is applied to the front window glass of an automobile is shown. One end 13A of the interlayer film 10 of this embodiment is arranged at the lower end of the front window glass, and the other end 13B is arranged at the upper end of the front window glass. Generally speaking, the length from one end 13A to the other end 13B of the interlayer film 10 (hereinafter, sometimes referred to as "product width") is, for example, 700 mm or more, but may be 740 mm or more, 800 mm or more, 900 mm or more, or 1000 mm or more. In addition, the above-mentioned length is, for example, 2500 mm or less, but may be 2000 mm or less, 1500 mm or less, or 1200 mm or less. Furthermore, the interlayer film with a larger product width is generally suitable for use in a front window glass that is arranged from the front surface of the vehicle to the top surface. The product width is generally the length from one end 13A to the other end 13B in the TD direction of the intermediate film.

[0070] like Figure 1 As shown, the interlayer film 10 of the first embodiment has a vehicle-mounted sensor region 11. The vehicle-mounted sensor region 11 is a region through which light, electromagnetic waves such as millimeter waves, and ultrasonic waves incident on the vehicle-mounted sensor from outside the vehicle pass when the interlayer film 10 is applied to the front windshield of a vehicle equipped with a vehicle-mounted sensor. The vehicle-mounted sensor is not particularly limited, and examples thereof include vehicle-mounted cameras, optical radars such as 3D-LiDAR, millimeter-wave radars, and ultrasonic sensors. In addition, the location where the vehicle-mounted sensor is mounted is not particularly limited as long as it is inside the vehicle, and it can be set near the front windshield or at a location away from the front windshield.

[0071] The vehicle-mounted sensor area 11 is generally arranged above the front windshield and facing the front of the vehicle. The vehicle-mounted sensor area 11 is, for example, any area of ​​approximately 100 to 200 mm within a range of 600 to 1000 mm, preferably 700 to 1000 mm, from one end 13A to the other end 13B, and is not particularly limited. For example, the vehicle-mounted sensor area 11 may be less than 100 mm (for example, 30 mm or more).

[0072] Furthermore, in this specification, the direction from one end 13A toward the other end 13B is referred to as the longitudinal direction, and the direction perpendicular to the longitudinal direction and the thickness direction of the intermediate film is referred to as the transverse direction. Generally speaking, the longitudinal direction is the direction consistent with the TD, and the transverse direction is the direction consistent with the MD, and there is no particular limitation. For example, the longitudinal direction is the direction from one end on the TD of the film toward the other end. Furthermore, MD is the Machine Direction, which is the direction consistent with the flow direction of the resin, and TD is the Transverse Direction.

[0073] The intermediate film 10 is preferably Figure 2 As shown, the wedge-shaped cross-sectional intermediate film has a wedge shape in which the thickness changes from one end 13A to the other end 13B. The wedge angle α in the wedge intermediate film is expressed as a positive value when the thickness increases from one end 13A toward the other end 13B, and is expressed as a negative value when the thickness decreases from one end 13A toward the other end 13B. The wedge intermediate film generally has a wedge angle expressed as a positive value, and the local wedge angle described below also usually has a positive value, but the wedge intermediate film may have a negative local wedge angle in part or in whole. In addition, the wedge intermediate film may have a portion where the wedge angle (local wedge angle) is 0 mrad.

[0074] On the other hand, it is preferable that the thickness of the intermediate film 10 is substantially uniform in the transverse direction. Therefore, even if the position in the transverse direction changes, the wedge angle at the same position in the longitudinal direction is substantially the same.

[0075] When the interlayer film 10 is applied to curved glass described below, it is stretched and curved, and the longitudinal direction and the like are also curved. The longitudinal direction and the lateral direction in the curved interlayer film are the directions of curvature in accordance with the curvature.

[0076] like Figure 2 As shown, the interlayer film 10 is disposed between the first and second laminated glass members 17A and 17B in the laminated glass 16. The two laminated glass members 17A and 17B are bonded to each other via the interlayer film 10.

[0077] (Wedge angle in the vehicle sensor area)

[0078] Figure 3 The wedge angle α in the vehicle-mounted sensor area 11 of this embodiment (see Figure 2 In the vehicle-mounted sensor region 11 of the intermediate film 10, the wedge angle α can be as follows: Figure 3 As shown in (A), by designing the design curve DP so that the wedge angle α is constant even when the position changes along the longitudinal direction, it is also possible to Figure 3 (B) and (C) are designed by changing the design curve DP at a certain rate of change along the longitudinal direction. Figure 3 As shown in (D), a design curve is formed by combining a design curve in which the wedge angle remains constant even when the position changes along the longitudinal direction and a design curve in which the wedge angle changes at a constant rate along the longitudinal direction.

[0079] However, in reality, the wedge angle α at each longitudinal position may partially or completely deviate from the design curve DP due to manufacturing errors during the manufacture of the interlayer film, as shown in the measured curve AP. The wedge angle α at each longitudinal position is called a local wedge angle. The local wedge angle is preferably measured by the following method.

[0080] The wedge angle for each longitudinal position, such as Figure 5As shown, in the intermediate film 10, after obtaining the thickness data of 1 mm intervals along the longitudinal direction by the thickness measuring machine, the 20 mm width W1 (= 21 points) centered at each point P in the above thickness data is subjected to simple moving average processing to remove noise from the above thickness data. Here, 21 points cannot be selected from the 10 points of the thickness data at the two end portions, and the data points that cannot be selected are ignored and noise removal is performed. The thickness data after the above noise removal is used as the vertical axis (y axis), and the coordinates of the position along the longitudinal direction with one end 13A as 0 are used as the horizontal axis (x axis). At this time, in the area between the point P (set as P1) which is the 41st point in the direction from one end 13A to the other end 13B and the point P (set as P2) which is the 41st point in the direction from the other end 13B to the one end 13A, the first-order approximate straight line based on the least square method is calculated for the 80 mm width W (= 81 points) centered at each point, and the angle formed by the first-order approximate straight line and the straight line of y=0 is used as the local wedge angle. The local wedge angle may be measured every 1 mm along the longitudinal direction so as to pass through the vehicle-mounted sensor area 11 (when there is a HUD display area 12 described below, the vehicle-mounted sensor area 11 and the HUD display area 12 ).

[0081] In the case where the vehicle-mounted sensor area 11 and the HUD display area 12 are not arranged at the same position in the longitudinal direction, it is preferable to gradually shift the measurement position in the lateral direction while performing the measurement so that the local wedge angle can be measured through both the vehicle-mounted sensor area 11 and the HUD display area 12. As described above, even if the lateral position changes, the local wedge angle is substantially the same, so even if the measurement position is shifted in the lateral direction, the measurement result is substantially the same.

[0082] Furthermore, as described above, even if the position in the lateral direction changes, the local wedge angle remains substantially the same. Therefore, in the interlayer film after laminated glass is formed, for example, when the shielding portion described below is provided adjacent to the vehicle-mounted sensor region 11 and the local wedge angle of the vehicle-mounted sensor region 11 cannot be measured, the local wedge angle of the position where the local wedge angle cannot be measured can be measured by shifting it in the lateral direction.

[0083] Furthermore, as a measuring machine for measuring the thickness of the intermediate film, a contact thickness gauge measuring machine "TOF-4R" (manufactured by Sanbun Electric Co., Ltd.) and the like can be cited. When using TOF-4R, the thickness is measured at a transfer speed of 1 to 3 m / min relative to the TD direction. As a thickness measuring machine for the intermediate film after the intermediate film is made into laminated glass, a non-contact multilayer film measuring machine "OPTIGAUGE" (manufactured by Lumetrics Co., Ltd.) and the like can be cited.

[0084] Furthermore, in Figure 3In , the design curve DP is a line obtained by plotting the design value of the wedge angle, and the measured curve AP is a line obtained by plotting the actual measured local wedge angle. Figure 3 In FIG. 1 , the design curve DP represents only the curve in the vehicle-mounted sensor area 11 , but the measured curve AP also represents the curves of the areas closer to the one end 13A and the other end 13B of the vehicle-mounted sensor area 11 for reference purposes.

[0085] Here, the interlayer film 10 of the present embodiment is characterized in that the maximum deviation S1 of the local wedge angle with respect to the approximate straight line L1 of the local wedge angle in the vehicle-mounted sensor region 11 is 0.2 mrad or less.

[0086] As described above, the wedge angle in the vehicle-mounted sensor area 11 is designed according to the design curve DP. Therefore, if the local wedge angle is measured from the one end 13A side toward the other end 13B side in the vehicle-mounted sensor area 11 and its approximate straight line L1 is obtained, the approximate straight line L1 is as follows: Figure 3 As shown, it becomes a linear straight line showing substantially the same tendency as the design curve DP.

[0087] Furthermore, in the present embodiment, by suppressing the maximum deviation S1 of the local wedge angle from the approximate straight line L1 of the local wedge angle showing a tendency substantially similar to the design curve DP in the vehicle-mounted sensor area 11 to 0.2 mrad or less as described above, the transmission double image of the light or the like detected by the vehicle-mounted sensor is significantly reduced, thereby improving the detection accuracy of the vehicle-mounted sensor. The principle of the significant reduction of the transmission double image when the maximum deviation S2 of the local wedge angle is set to a certain value or less is not clear, but it is found by the inventors through experimental research as shown in the following embodiments. In addition, the maximum deviation S1 is an index indicating the amount of deviation from the approximate straight line L1, and is expressed as an absolute value.

[0088] The approximate straight line L1 is a linear function obtained by the least square method based on the local wedge angle measured in the vehicle-mounted sensor area 11 and the longitudinal position where the local wedge angle is measured. When the longitudinal position is x and the local wedge angle is y, it is expressed as y=ax+b. In addition, x is the position of the end 13A as 0. (a and b are coefficients; in addition, a and b can be 0; a is the slope of the approximate straight line L1)

[0089] As described above, the maximum deviation S1 of the local wedge angle relative to the approximate straight line L1 in the vehicle-mounted sensor area 11 may be 0.2 mrad or less, but from the viewpoint of effectively reducing the transmission double image and improving the detection accuracy, it is preferably 0.18 mrad or less, more preferably 0.15 mrad or less, and further preferably 0.10 mrad or less. In addition, the maximum deviation S1 may be 0 mrad or more, but from the viewpoint of facilitating the manufacture of the intermediate film by a conventional manufacturing method, it is preferably a certain value or more, for example, 0.01 mrad or more, preferably 0.03 mrad or more, more preferably 0.04 mrad or more, and further preferably 0.05 mrad or more. The maximum deviation S1 is, for example, 0.01 mrad or more and 0.2 mrad or less, preferably 0.01 mrad or more and 0.18 mrad or less, more preferably 0.03 mrad or more and 0.15 mrad or less, further preferably 0.04 mrad or more and 0.10 mrad or less, and further preferably 0.05 mrad or more and 0.10 mrad or less.

[0090] The average value obtained by arithmetic averaging the local wedge angles calculated in the vehicle-mounted sensor area 11 is not particularly limited, but from the viewpoint of preventing the vehicle-mounted camera from detecting a transmitted double image and improving the detection accuracy, it is preferably a certain value or less, for example, preferably 0.5 mrad or less, more preferably 0.4 mrad or less, and further preferably 0.3 mrad or less. In addition, the average value of the local wedge angles in the vehicle-mounted sensor area 11 is preferably -0.3 mrad or more, more preferably -0.2 mrad or more, and further preferably -0.1 mrad or more.

[0091] Furthermore, the absolute value of the average value of the local wedge angles of the intermediate film 10 in the on-vehicle sensor region 11 only needs to be 0 mrad or more, and therefore, there may be substantially no thickness variation in the on-vehicle sensor region 11 .

[0092] Furthermore, in order to reduce transmission double images and improve the detection accuracy of the vehicle-mounted sensor, the average value obtained by arithmetically averaging the local wedge angles calculated in the vehicle-mounted sensor area 11 is preferably appropriately set according to the assumed distance of the object detected by the vehicle-mounted sensor.

[0093] For example, when the assumed distance of the object detected by the vehicle-mounted sensor is a relatively short distance (for example, less than 50 m, preferably about 10 to 30 m), the transmission double image can be easily reduced by making the wedge angle in the vehicle-mounted sensor area 11 relatively large. Specifically, when the distance is relatively short, the average value of the local wedge angle in the vehicle-mounted sensor area 11 is preferably set to be greater than 0.1 mrad, but may be set to be greater than 0.15 mrad, may be set to be greater than 0.2 mrad, or may be set to be greater than 0.25 mrad. From the same point of view, the average value obtained by taking the arithmetic average of the local wedge angles calculated in the vehicle-mounted sensor area 11 is preferably set to be less than -0.05 mrad, more preferably less than -0.1 mrad, and further preferably less than -0.15 mrad.

[0094] On the other hand, when the assumed distance of the object detected by the vehicle-mounted sensor is a relatively long distance (for example, more than 50 m, preferably about 70 to 120 m), the transmission double image is easily reduced by making the absolute value of the wedge angle in the vehicle-mounted sensor area 11 relatively small. Specifically, when the distance is relatively long, the average value of the local wedge angle in the vehicle-mounted sensor area 11 is preferably set to, for example, -0.12 mrad or more and less than 0.12 mrad, more preferably -0.10 mrad or more and less than 0.10 mrad, further preferably -0.05 mrad or more and less than 0.05 mrad, and further preferably -0.03 mrad or more and less than 0.03 mrad.

[0095] Furthermore, when the assumed distance of the detected object is a relatively short distance, for example, when a vehicle-mounted camera is used as a vehicle-mounted sensor and the vehicle-mounted sensor is used for a pedestrian detection system, etc., it is more suitable. In addition, for example, a vehicle-mounted camera is used as a vehicle-mounted sensor and the vehicle-mounted sensor is used for the detection of objects at a relatively short distance (for example, less than 50m, preferably about 10 to 30m) such as white lines, pedestrians, bicycles and other non-motor vehicles.

[0096] On the other hand, when the assumed distance of the detected object is relatively far, it is more appropriate to use a vehicle-mounted camera as a vehicle-mounted sensor and use the vehicle-mounted sensor for a driving recorder. In addition, it is particularly appropriate to use a vehicle-mounted camera as a vehicle-mounted sensor and use the vehicle-mounted sensor for signal recognition and other purposes to detect objects at a relatively long distance (for example, more than 50m, preferably approximately 70 to 120m).

[0097] The slope of the approximate straight line L1 in the vehicle-mounted sensor area 11 is preferably 0.7 mrad / 100 mm or less. It is more preferably 0.5 mrad / 100 mm or less, further preferably 0.3 mrad / 100 mm or less, still more preferably 0.1 mrad / 100 mm or less, further preferably 0.05 mrad / 100 mm or less, particularly preferably 0.01 mrad / 100 mm or less, and particularly preferably 0.005 mrad / 100 mm or less. By setting the slope of the approximate straight line L1 in the vehicle-mounted sensor area 11 to be less than the above upper limit value, the transmission double image is reduced, and the detection accuracy of the vehicle-mounted sensor is easily improved. In addition, there is also an advantage that the degassing property during bonding is improved.

[0098] From this viewpoint, the slope of the approximate straight line L1 in the vehicle-mounted sensor area 11 may be, for example, from -0.3 mrad / 100 mm to 0.3 mrad / 100 mm, but is preferably from -0.22 mrad / 100 mm to 0.22 mrad / 100 mm, and more preferably from -0.10 mrad / 100 mm to 0.10 mrad / 100 mm.

[0099] The slope of the approximate straight line L1 in the vehicle-mounted sensor area 11 is preferably substantially close to 0 mrad / 100 mm. If the slope of the approximate straight line L1 is substantially close to 0 mrad / 100 mm, the wedge angle in the vehicle-mounted sensor area 11 is substantially constant, so it is easy to reduce the transmission double image and improve the detection accuracy of the vehicle-mounted sensor. Specifically, the slope of the approximate straight line L1 in the vehicle-mounted sensor area 11 is preferably not less than -0.007 mrad / 100 mm and not more than 0.007 mrad / 100 mm, and more preferably not less than -0.005 mrad / 100 mm and not more than 0.005 mrad / 100 mm.

[0100] Furthermore, the slope is expressed in mrad / 100mm, but is expressed in units of 100mm for convenience only and is not limited to the case where the vehicle-mounted sensor area has a length of more than 100mm. The vehicle-mounted sensor area may also be less than 100mm (for example, 30mm).

[0101] (Area outside the vehicle sensor area)

[0102] The interlayer film 10 of this embodiment may also have a portion where the local wedge angle changes in the region other than the vehicle-mounted sensor region 11. If the region other than the vehicle-mounted sensor region 11 has a portion where the local wedge angle changes, the local wedge angle can be set in the region other than the vehicle-mounted sensor region 11 according to the longitudinal position. Therefore, the generation of a transmission double image in the region other than the vehicle-mounted sensor region 11 can be suppressed, thereby improving the visibility of the interlayer film. In addition, as described below, when a HUD display region is provided, the generation of a reflection double image in the HUD display region can also be suppressed, thereby improving the display accuracy of the HUD.

[0103] Furthermore, the portion with a local wedge angle change means that the approximate straight line LA is obtained at each point in the specific area, and the absolute value of the slope of at least any one of the approximate straight lines LA is greater than 0.008 mrad / 100 mm, but the specific area is preferably a portion where the absolute value of the slope of the approximate straight line LA is greater than 0.01 mrad / 100 mm. Furthermore, here, the "specific area" in this regulation is an area other than the vehicle-mounted sensor area 11, specifically, an area on the one end 13A side and an area on the other end 13A side of the vehicle-mounted sensor area 11. In addition, the calculation method of the approximate straight line LA is described in detail below.

[0104] However, the interlayer film 10 of the present embodiment may not have a portion where the local wedge angle changes in the region other than the vehicle-mounted sensor region 11. If the interlayer film 10 does not have a portion where the local wedge angle changes in the region other than the vehicle-mounted sensor region 11, the wedge angle in the vehicle-mounted sensor region 11 and the local wedge angle in the region other than the vehicle-mounted sensor region 11 are substantially the same. Therefore, the average value of the local wedge angle in the vehicle-mounted sensor region 11 can improve the visibility of the region other than the vehicle-mounted sensor region 11, and also improve the display accuracy of the HUD in the HUD display region. In this case, the average value of the local wedge angle in the vehicle-mounted sensor region 11 may be, for example, approximately 0.005 mrad or more and 0.3 mrad or less.

[0105] Furthermore, the portion without local wedge angle change refers to an approximate straight line LA obtained at each point in a specific area (here, the area outside the vehicle-mounted sensor area 11), and the maximum absolute value of the slope of the approximate straight line LA is less than 0.008mrad / 100mm, but the maximum absolute value of the above-mentioned absolute value may also be less than 0.005mrad / 100mm.

[0106] The above definitions of “a portion having a local wedge angle change” and “a portion having no local wedge angle change” also apply when describing in another area (such as an area other than the HUD display area) described below.

[0107] (HUD display area)

[0108] The interlayer film 10 for laminated glass of the present embodiment is preferably as follows Figure 1 As shown, the HUD display area 12 for displaying the HUD image is provided. Generally, the HUD display area 12 is preferably disposed below the front windshield when the interlayer film 10 for laminated glass is applied to the front windshield. Figure 1 Although shown as a long strip-shaped area in the horizontal direction, it is not particularly limited and may be divided into a plurality of parts (not shown) and arranged in the horizontal direction.

[0109] In addition, regarding the HUD display area 12 , a region of 200 to 500 mm from the one end 13A toward the other end 13B within a range of 100 to 600 mm from the one end 13A is substantially the HUD display area.

[0110] In the case of a HUD display area 12, a HUD display device (not shown) is provided in the vehicle. Light from the light source of the HUD display device is irradiated to the laminated glass at a position corresponding to the HUD display area 12, and light reflected by the laminated glass enters the eyes of the driver and is recognized as a HUD image. The type of HUD display device is not particularly limited, and the focal length of the displayed image may be 1, or the focal length of the displayed image may be 2 or more, and a dual HUD may be provided that displays different images at different positions in the longitudinal direction.

[0111] In the intermediate film 10 , the HUD display area 12 preferably has a wedge angle so that the thickness of the intermediate film 10 varies depending on the longitudinal position, but preferably has a positive wedge angle (local wedge angle) to reduce reflected double images.

[0112] A representative design curve of the local wedge angle in the HUD display area 12 is shown in Figure 4 .like Figure 4 As shown in (A), the design curve DP in the HUD display area 12 can also be designed by a design curve whose local wedge angle is constant even if the position changes along the longitudinal direction.

[0113] In addition, the design curve DP can also be Figure 4 As shown in (B) to (D), there is a portion where the local wedge angle changes at a certain rate along the longitudinal direction. In this way, if the HUD display area 12 has an area where the local wedge angle substantially changes, for example, even if the height position of the driver's eyes changes, it is possible to select the wedge angle that is most suitable for suppressing the reflected double image at each position. In addition, for an HUD that displays two or more images with different focal lengths, such as a dual HUD, it is possible to effectively suppress the reflected double image. In particular, if Figure 4As shown in (C) and (D), a portion having a constant local wedge angle even when the longitudinal position changes is more suitable for a dual HUD.

[0114] In the HUD display area 12, the approximate straight line L2 of the local wedge angle of each point is obtained along the longitudinal direction, and the maximum value S2 of the absolute value of the difference between the local wedge angle and the approximate straight line L2 of each point is preferably less than 0.2 mrad. In this way, if the maximum value S2 of the absolute value of the difference between the local wedge angle and the approximate straight line L2 of the local wedge angle is less than 0.2 mrad, the local wedge angle at each position of the HUD display area 12 is roughly consistent with the required angle (i.e., the design curve). Therefore, it is possible to prevent the generation of reflected double images in the HUD image, and improve the display accuracy of the HUD image. That is, not only the detection accuracy of the vehicle-mounted sensor can be improved, but also the display accuracy of the HUD image can be improved.

[0115] From the viewpoint of further improving the display accuracy of the HUD image, the maximum value S2 of the absolute value of the difference between the local wedge angle and the approximate straight line L2 is more preferably 0.18 mrad or less, further preferably 0.15 mrad or less, and further preferably 0.1 mrad or less. In addition, the maximum value S2 may be 0 mrad or more, but from the viewpoint of facilitating the manufacture of the intermediate film by a conventional manufacturing method, it is preferably a certain value or more, for example, 0.01 mrad or more, preferably 0.03 mrad or more, more preferably 0.04 mrad or more, and further preferably 0.05 mrad or more. The maximum value S2 is, for example, 0.01 mrad or more and 0.2 mrad or less, preferably 0.01 mrad or more and 0.18 mrad or less, more preferably 0.03 mrad or more and 0.15 mrad or less, further preferably 0.04 mrad or more and 0.10 mrad or less, and further preferably 0.05 mrad or more and 0.10 mrad or less.

[0116] Below, use Figure 6 The following is a detailed description of the calculation method of the approximate straight line L2 of each point. Figure 6 As shown, in the HUD display area 12, an area R1 is selected with each point P as the center and a range of 50 mm in one direction and the other direction, and an approximate straight line of the local wedge angle is calculated in the area R1, and the calculated approximate straight line is used as the approximate straight line L2 of each point P.

[0117] Here, each point P is the same as the measurement point for determining the local wedge angle, such as Figure 6As shown, the measurement may be performed in the region R2 excluding the region within 50 mm in the longitudinal direction from the one end 14A of the HUD display region 12 and the region within 50 mm in the longitudinal direction from the other end 14B of the region 12. Next, the absolute value of the difference between the value of each approximate straight line L2 calculated at each point P (i.e., the value of y) and each measured local wedge angle is calculated, and the maximum value among the absolute values ​​calculated at each point P in the region R2 is adopted as the maximum value S2.

[0118] Furthermore, in the HUD display area 12, the reason for calculating a plurality of approximate straight lines L2 is that Figure 4 As shown in (C) and (D), there are displacement points where the curve of the wedge angle changes greatly. If a plurality of approximate straight lines L2 are not calculated, the amount of deviation from the design curve DP may not be estimated.

[0119] However, when the length of the HUD display area 12 in the longitudinal direction is 100 mm or less, it is sufficient to calculate only one approximate straight line of the local wedge angle of the entire HUD display area 12 in the same manner as the approximate straight line L1 .

[0120] In addition, each approximate straight line L2 is a linear function obtained by the least square method based on the local wedge angle measured in the area R2 of the HUD display area 12 and the longitudinal position of the local wedge angle. When the longitudinal position is x and the local wedge angle is y, it is expressed as y=ax+b. In addition, x is the position of the end 13A as 0. (a and b are coefficients; in addition, a and b can be 0; a is the slope of the approximate straight line L2)

[0121] Furthermore, the following approximate straight line L3 is preferably obtained in the same manner as the above-mentioned approximate straight line L2, and in the approximate straight line L3, the approximate straight line of each point is preferably obtained in the region other than the region of 50 mm from both ends of the one end side region 20. In addition, the above-mentioned approximate straight line LA is preferably obtained by the same method. Furthermore, in the measurement of the approximate straight line LA, when there are two specific regions of the measurement object, the approximate straight line is preferably obtained for each point in each region by the same method as described above.

[0122] Regarding the HUD display area 12, Figure 4 As shown in (A), (C), and (D), in a portion having a design curve in which the local wedge angle is constant even when the position changes along the longitudinal direction, the slope of the approximate straight line L2 calculated in accordance with the design curve is substantially close to a value of 0 mrad / 100 mm. Therefore, in one aspect, the HUD display area 12 preferably has a portion having an absolute value of the slope of the approximate straight line L2 of less than 0.005 mrad / 100 mm, more preferably a portion having a slope of less than 0.004 mrad / 100 mm, and more preferably a portion having a slope of less than 0.003 mrad / 100 mm.

[0123] Furthermore, when there is a portion where the absolute value of the slope of the approximate straight line L2 is less than 0.005 mrad / 100 mm, all the approximate straight lines L2 calculated in the HUD display area 12 may be less than 0.005 mrad / 100 mm, but some of the approximate straight lines L2 may be less than 0.005 mrad / 100 mm.

[0124] In addition, regarding the HUD display area 12, as shown in FIG. Figure 4 As shown in (B), (C), and (D), at a portion having a design curve where the local wedge angle changes at a certain rate along the longitudinal direction, the slope of the approximate straight line L2 calculated in accordance with the design curve is a value deviating from 0 mrad / 100 mm. Therefore, in one aspect, the HUD display area 12 may also have a portion where the absolute value of the slope of the approximate straight line L2 is greater than or equal to 0.005 mrad / 100 mm.

[0125] Furthermore, in the HUD display area 12 , from the viewpoint of suppressing reflected double images, the slope of the approximate straight line L2 is preferably negative so that the wedge angle decreases from the one end 13A toward the other end 13B.

[0126] Therefore, in one aspect, the HUD display area 12 preferably has a portion where the slope of the approximate straight line L2 is less than -0.005 mrad / 100 mm, more preferably a portion where the slope is less than -0.007 mrad / 100 mm, further preferably a portion where the slope is less than -0.01 mrad / 100 mm, and further preferably a portion where the slope is less than -0.15 mrad / 100 mm. Furthermore, in the HUD display area 12, the portion where the slope of the approximate straight line L2 is less than the above upper limit value (e.g., -0.005 mrad / 100 mm) is not particularly limited, and is, for example, greater than -0.4 mrad / 100 mm, and preferably greater than -0.25 mrad / 100 mm.

[0127] Furthermore, when there is a portion where the slope of the approximate straight line L2 is less than the above-mentioned specific value (for example, -0.005 mrad / 100 mm), the slopes of all the approximate straight lines L2 calculated in the HUD display area 12 may be less than the above-mentioned specific value (for example, -0.005 mrad / 100 mm), but the slope of a part of the approximate straight line L2 may be less than the above-mentioned specific value. That is, the HUD display area 12 may have both a portion where the absolute value of the slope of the approximate straight line L2 is less than 0.005 mrad / 100 mm and a portion where the slope of the approximate straight line L2 is less than the above-mentioned specific value (for example, -0.005 mrad / 100 mm).

[0128] The average value of the local wedge angle in the HUD display area 12 is not particularly limited, but from the perspective of reducing reflected double images and improving display accuracy, it is preferably above a certain value, for example, it can be above 0.07 mrad, preferably above 0.1 mrad, more preferably above 0.2 mrad, and further preferably above 0.3 mrad. In addition, if the wedge angle becomes larger, the penetrating light from outside the vehicle is likely to become a double image. Therefore, from the perspective of suppressing the formation of a transmitted double image due to light penetrating the HUD display area 12, it is preferred that the average value of the local wedge angle in the HUD display area 12 is set to be below a certain value, for example, it can be below 1.0 mrad, preferably below 0.7 mrad, more preferably below 0.55 mrad, and further preferably below 0.5 mrad. The average value of the local wedge angle in the HUD display area 12 is, for example, 0.07 mrad to 1.0 mrad, preferably 0.1 mrad to 0.7 mrad, more preferably 0.2 mrad to 0.55 mrad, and even more preferably 0.3 mrad to 0.5 mrad.

[0129] In addition, from the viewpoint of suppressing the reflected double image in the HUD display area 12 and improving the display accuracy, suppressing the transmitted double image in the vehicle sensor area 11 and improving the detection accuracy, and from the viewpoint of not easily causing the winding deviation when the interlayer film is wound into a roll shape and easily maintaining the roll shape, the absolute value of the difference between the average value of the local wedge angle in the vehicle sensor area 11 and the average value of the local wedge angle in the HUD display area 12 is preferably 0.01 mrad or more, more preferably 0.05 mrad or more, further preferably 0.1 mrad or more, and further preferably 0.15 mrad or more. In addition, from the viewpoint of suppressing the formation of the transmitted double image due to the light passing through the HUD display area 12, and from the viewpoint of suppressing the bonding failure when bonding with the glass plate, the absolute value of the difference between the average values ​​of the local wedge angles may be, for example, 0.9 mrad or less, preferably 0.7 mrad or less, more preferably 0.5 mrad or less, and further preferably 0.4 mrad or less. In addition, the absolute value of the difference between the average value of the local wedge angle in the vehicle-mounted sensor area 11 and the average value of the local wedge angle in the HUD display area 12 is preferably greater than 0.01 mrad and less than 0.9 mrad, more preferably greater than 0.05 mrad and less than 0.7 mrad, further preferably greater than 0.1 mrad and less than 0.5 mrad, and further more preferably greater than 0.15 mrad and less than 0.4 mrad.

[0130] Furthermore, the average value of the local wedge angles in the HUD display area 12 is preferably greater than the average value of the local wedge angles in the vehicle-mounted sensor area 11. By increasing the wedge angle in the HUD display area 12 and making the wedge angle in the vehicle-mounted sensor area 11 relatively smaller, it is easy to suppress reflected double images in the HUD display area 12 and improve display accuracy, and suppress transmitted double images in the vehicle-mounted sensor area 11 and further improve detection accuracy.

[0131] The interlayer film 10 preferably has the HUD display region 12 as described above, but may not have the HUD display region 12. That is, the HUD image may not be displayed on the laminated glass including the interlayer film 10.

[0132] In the case where there is no HUD display area 12, such as Figure 7 As shown, the average value of the local wedge angle of the area 20 from one end 13A toward the other end 13B to the vehicle-mounted sensor area 11 (hereinafter also referred to as the "one end side area") may be the same as the average value of the local wedge angle of the vehicle-mounted sensor area 11, but is preferably different. Specifically, the difference is preferably greater than 0.001 mrad.

[0133] When the HUD display area 12 is not provided, by making the wedge angles of the one-end side area 20 and the vehicle-mounted sensor area 11 different, it is also possible to set the wedge angles corresponding to each area, which makes it easy to improve the detection accuracy in the vehicle-mounted sensor area 11 and also improve the visibility of the one-end side area 20.

[0134] As described above, the absolute value of the difference between the average value of the local wedge angle of the one end side area 20 and the average value of the local wedge angle of the vehicle-mounted sensor area 11 is preferably greater than 0.001 mrad, but is more preferably greater than 0.005 mrad, and even more preferably greater than 0.1 mrad. In addition, it is preferably less than 0.5 mrad, more preferably less than 0.4 mrad, and even more preferably less than 0.3 mrad.

[0135] The average value of the local wedge angle of the one end side region 20 is not particularly limited, and is, for example, less than 0.55 mrad, preferably less than 0.4 mrad, more preferably less than 0.2 mrad, further preferably less than 0.1 mrad, and further preferably less than 0.05 mrad. In addition, for example, it is greater than -0.3 mrad, preferably greater than -0.25 mrad, more preferably greater than -0.2 mrad, further preferably greater than -0.1 mrad, and further preferably greater than -0.05 mrad.

[0136] Furthermore, the one end side region 20 preferably has a region 20A where the local wedge angle is substantially close to 0 mrad and the slope of the approximate straight line L3 at each point is substantially close to 0 mrad / 100 mm. Furthermore, the region 20A is preferably connected to the vehicle-mounted sensor region 11 via a region 20B where the absolute value of the slope of the approximate straight line L3 is sufficiently greater than 0 mrad / 100 mm. The design curve of the wedge angle of such an interlayer film 10 is, for example, the following curves No. 4 and 5 (see Fig.14 , 15 ) is shown.

[0137] Furthermore, the local wedge angle of each point in the region 20A is, for example, not less than -0.1 mrad and not more than 0.1 mrad, preferably not less than -0.05 mrad and not more than 0.05 mrad. In addition, the slope of the approximate straight line L3 of each point in the region 20A is, for example, not less than -0.01 mrad / 100 mm and not more than 0.01 mrad / 100 mm, preferably not less than -0.007 mrad and not more than 0.007 mrad.

[0138] On the other hand, the absolute value of the slope of the approximate straight line L3 at each point in the region 20B may be 0.01 mrad / 100 mm or more and 0.4 mrad / 100 mm or less.

[0139] (Area outside the HUD display area)

[0140] The interlayer film 10 of the present embodiment may have a portion where the local wedge angle changes in the region other than the HUD display region 12. If the region other than the HUD display region 12 has a portion where the local wedge angle changes, the local wedge angle can be set according to the longitudinal position in the region other than the HUD display region 12. Therefore, as described above, the detection accuracy can be improved in the vehicle-mounted sensor region 11, or the generation of a transmission double image can be suppressed in the region other than the vehicle-mounted sensor region 11 and the HUD display region 12, thereby improving the visibility of the interlayer film 10.

[0141] However, the interlayer film 10 of the present embodiment may not have a portion where the local wedge angle changes in the region other than the HUD display region 12. Even if the interlayer film 10 does not have a portion where the local wedge angle changes in the region other than the HUD display region 12, the interlayer film 10 can suppress the occurrence of a transmission double image to a certain extent in the region other than the HUD display region 12 by setting the average wedge angle in the HUD display region 12 to the same degree as the average wedge angle, thereby improving the visibility of the interlayer film. In addition, it is also possible to improve the detection accuracy in the vehicle-mounted sensor region 11.

[0142] (Except the vehicle sensor area and HUD display area)

[0143] The interlayer film 10 of the present embodiment may have a portion where the wedge angle changes locally in a region other than the HUD display region 12 and the vehicle-mounted sensor region 11. If the portion where the wedge angle changes locally is present in a region other than the HUD display region 12 and the vehicle-mounted sensor region 11, for example, the difference between the average wedge angle of the HUD display region 12 and the average wedge angle of the vehicle-mounted sensor region 11 can be easily increased. Therefore, the portion where the wedge angle changes locally is preferably provided in a region between the HUD display region 12 and the vehicle-mounted sensor region 11.

[0144] However, the interlayer film 10 of the present embodiment may not have a portion where the wedge angle changes locally in a region other than the HUD display region 12 and the onboard sensor region 11 .

[0145] When there is no portion where the local wedge angle changes in the region other than the HUD display region 12 and the vehicle-mounted sensor region 11, for example, it is easy to make the average value of the local wedge angle of the HUD display region 12 and the average value of the local wedge angle of the vehicle-mounted sensor region 11 equal to each other. Therefore, it is also preferable that there is no portion where the local wedge angle changes in the region between the HUD display region 12 and the vehicle-mounted sensor region 11.

[0146] (Visible light transmittance)

[0147] The interlayer film 10 preferably has a visible light transmittance of 60% or more, more preferably 70% or more, further preferably 75% or more, and further preferably 80% or more. The interlayer film 10 has a high visible light transmittance, thereby improving visibility and can be suitably used for windshields of various vehicles such as automobiles. The visible light transmittance is not particularly limited, and may be 100% or less, but in practical use, may be 99% or less.

[0148] Furthermore, it is preferred that the visible light transmittance of the interlayer film 10 at least in the vehicle-mounted sensor region 11 or in the vehicle-mounted sensor region 11 and the HUD display region 12 is within the above range.

[0149] As described above, the interlayer film 10 may have a visible light transmittance in all regions within the above range, but may have a visible light transmittance of 60% or more in a portion (e.g., the vehicle sensor region 11 or a region including the vehicle sensor region 11 and the HUD display region 12) and a visible light transmittance of less than 60% in other portions. More specifically, as described below, the interlayer film 10 may have a colored region having a visible light transmittance of less than 60%.

[0150] Furthermore, in the present invention, the visible light transmittance of the interlayer film is obtained by measuring the visible light transmittance of a laminated glass produced by bonding two reference transparent glass plates via the interlayer film. Furthermore, the visible light transmittance can be measured in accordance with JIS R3212 (2015). In addition, the reference transparent glass plate used for the visible light transmittance is a flat glass having a thickness of 2.5 mm and a visible light transmittance of 90.5% measured in accordance with JIS R 3106:1998, and more specifically, a transparent glass plate used in the examples.

[0151] (Colored Area)

[0152] An example of the interlayer film 10 having a colored region is shown in Figure 8 The colored region 21 is preferably disposed on the other end 13B side of the vehicle-mounted sensor region 11, for example, preferably disposed in the region from a specific position on the other end 13B side of the vehicle-mounted sensor region 11 to the other end 13B. The colored region 21 does not necessarily need to be disposed at a position away from the vehicle-mounted sensor region 11, and may also be disposed at a position in contact with the vehicle-mounted sensor region 11. The colored region 21 preferably contains a colorant and is colored in a corresponding portion of the intermediate film 10 as described below.

[0153] Furthermore, the intermediate film 10 is Figure 8 In the example of FIG. 1 , the vehicle sensor region 11 and the HUD display region 12 are both included, but the HUD display region 12 may be omitted as described above, and the intermediate film 10 may not include the HUD display region but include the vehicle sensor region 11 and the colored region 13. In this case, the details of the region from the one end 13A to the vehicle sensor region 11 (the one end side region 20) are as described above.

[0154] like Figure 8 As shown, when the interlayer film 10 has the colored region 21 on the other end 13B side of the vehicle-mounted sensor region 11, the colored region 21 becomes a so-called sun visor located above the front surface of the vehicle, etc., and can protect the driver and other passengers from direct sunlight. In addition, the front windshield glass is sometimes provided from the front surface of the vehicle to the top surface, but in this case, the colored region 21 is preferably provided from the top of the front surface of the vehicle to the top surface.

[0155] In the interlayer film 10, the average value of the local wedge angle of the colored region 21 is preferably 0.6 mrad or less. By lowering the average value of the local wedge angle in the colored region 21, the transmittance curve of the colored region can be made uniform. The average value of the local wedge angle of the colored region 21 is preferably 0.4 mrad or less, more preferably 0.2 mrad or less, and further preferably 0.15 mrad or less.

[0156] The lower limit of the average value of the local wedge angle in the colored area 21 is not particularly limited, and can be, for example, -0.6 mrad or more, preferably -0.2 mrad or more, more preferably -0.1 mrad or more, and further preferably -0.05 mrad or more. In this way, by not making the wedge angle of the colored area 21 a large negative value, the transmittance curve of the colored area can be made uniform. In addition, by not making it a large negative value, the difference between the average value of the local wedge angle in the colored area 21 and the wedge angle of the vehicle-mounted sensor area 11 or the HUD display area 12, etc., becomes small, making it easy to manufacture the intermediate film.

[0157] The colored region 21 is a region where the visible light transmittance is less than 60%, but the visible light transmittance of the colored region 21 may be constant or different for each region. In addition, from the perspective of improving light shielding properties, design properties, etc., the visible light transmittance of the region of the portion with the lowest visible light transmittance of the colored region 21 is preferably 40% or less, and more preferably 20% or less. In addition, the visible light transmittance of the region of the portion with the lowest visible light transmittance of the colored region 21 may be, for example, 0.1% or more, preferably 1% or more. By setting the visible light transmittance of the colored region 21 to a certain value or more, a certain degree of visibility can be ensured in the colored region 21.

[0158] (Shielding part)

[0159] like Fig. 9 , 10 As shown, in laminated glass, a shielding portion 19 called black ceramic is sometimes provided on the peripheral portion of at least one of the laminated glass components 17A, 17B. Black ceramic is a black shielding portion, and is preferably made of black ceramic, for example. Black ceramic is generally provided to ensure light shielding properties or to protect the peripheral portion of the laminated glass component. In the present embodiment, the vehicle-mounted sensor area 11 is arranged at a position adjacent to the shielding portion 19, and is preferably arranged in a manner that is in contact with the shielding portion 19 when the intermediate film 10 is observed in the thickness direction. Furthermore, the shielding portion 19 may also be as shown in FIG. Fig. 9 As shown in the figure, it is set in a frame shape along the peripheral edge of at least one of the laminated glass components, and is connected only to the other end 13B side of the vehicle-mounted sensor area 11, but it can also be as shown in the figure. Fig.10 As shown, it is arranged so as to surround the shielding portion 19 and so as to be connected to both sides.

[0160] (Curve of wedge angle of the entire interlayer film)

[0161] In this embodiment, the design curve of the wedge angle of the intermediate film having the HUD display area 12 and the vehicle-mounted sensor area 11 is preferably such that the above Figure 3 (A)~ Figure 3 Any of the design curves DP shown in (D) and the above Figure 4The design curves DP shown in (A) to (D) are combined.

[0162] Specific examples of the design curve of the wedge angle of the interlayer film having the HUD display area 12 and the vehicle-mounted sensor area 11 include: Figures 14 to 17 The curves shown are No. 1 to No. 3, No. 6 to 15. However, Figures 14 to 17 The design curves shown are specifically shown for the purpose of illustrating the present invention, and the present invention is not limited to Figures 14 to 17 The design curves shown.

[0163] The overall design curve of the interlayer 10 may be, for example, as shown by curves No. 1, 10, 14, and 15. Figure 3 (A) Design curve and Figure 4 The design curve combination (A) has a design curve with a substantially constant wedge angle in each of the vehicle-mounted sensor area 11 and the HUD display area 12 .

[0164] In this case, it is also possible to use curve No. 1 (refer to Fig.14 ) as shown in the figure, the average values ​​of the local wedge angles of the vehicle-mounted sensor area 11 and the HUD display area 12 are made substantially the same, so that there is no portion where the local wedge angle changes between the HUD display area 12 and the vehicle-mounted sensor area 11.

[0165] In addition, as shown in curve No. 10 (refer to Fig.16 ), No.14, 15 (refer to Fig.17 ) as shown in the figure, the average values ​​of the local wedge angles of the vehicle-mounted sensor area 11 and the HUD display area 12 are set to be substantially different from each other, and there is a portion between the HUD display area 12 and the vehicle-mounted sensor area 11 where the local wedge angle changes.

[0166] In addition, the design curve of the intermediate film 10 can also be Figure 3 The design curve shown in (B) is Figure 4 The design curve combination shown in (A) makes the local wedge angle substantially constant in the HUD display area 12 , and makes the local wedge angle substantially variable in the vehicle-mounted sensor area 11 , as shown by curves No. 2 and No. 9 .

[0167] Similarly, the overall design curve of the intermediate film 10 can also be Figure 3 The design curve shown in (D) is Figure 4 The design curve combination shown in (A) makes the local wedge angle substantially constant in the HUD display area 12 and makes the local wedge angle substantially variable in the vehicle-mounted sensor area 11 .

[0168] In the above design curve, it can also be as curve No.2 (refer to Fig.14 ), No.13 (refer to Fig.17), the portion with a local wedge angle change between the HUD display area 12 and the vehicle-mounted sensor area 11 may also be as shown in No.9 (reference Fig.16 ) shows a portion without a local wedge angle change.

[0169] In addition, the overall design curve of the intermediate film 10 can also be Figure 3 The design curve shown in (A) is Figure 4 The design curve combination shown in (C) is such that, as shown by curves No. 8, 11, and 12, the local wedge angle is substantially changed in the HUD display area 12, and the local wedge angle is substantially the same in the vehicle-mounted sensor area 11.

[0170] Similarly, you can also Figure 3 The design curve shown in (A) is Figure 4 The design curve combination shown in (D) is such that, as shown by curve No. 6, the local wedge angle is substantially changed in the HUD display area 12 and the local wedge angle is substantially the same in the vehicle-mounted sensor area 11 .

[0171] In addition, similarly, Figure 3 The design curve shown in (A) is Figure 4 The design curve combination shown in (B) is such that, as shown by curve No. 7, the local wedge angle is substantially changed in the HUD display area 12 and the local wedge angle is substantially the same in the vehicle-mounted sensor area 11 .

[0172] In these cases, the curve No. 3 (refer to Fig.14 ), No.8 (refer to Fig.15 ), No.12 (refer to Fig.16 ), there is a portion where the local wedge angle changes between the HUD display area 12 and the vehicle-mounted sensor area 11. In addition, as shown in curves No. 6 and 7 (refer to Fig.15 ), No.11 (refer to Fig.16 ) as shown, there is no portion where the local wedge angle changes between the HUD display area 12 and the vehicle-mounted sensor area 11.

[0173] Furthermore, it is also possible to use curve No. 3 (refer to Fig.14 )、Curve No.13 (refer to Fig.14 ), for example, Figure 3 The design curve shown in (D) is Figure 4 (C) or Figure 4 The design curve combination shown in (D) substantially changes the local wedge angle in either the HUD display area 12 or the vehicle-mounted sensor area 11 .

[0174] In these cases, as shown in curves No. 3 and 13 , there may be a portion where the wedge angle changes locally between the HUD display area 12 and the vehicle sensor area 11 , or there may be no portion where the wedge angle changes locally between the HUD display area 12 and the vehicle sensor area 11 .

[0175] In addition, the interlayer film 10 may also have a colored region 21 in addition to the HUD display region 12 and the vehicle-mounted sensor region 11 as shown in curve No. 16. In this case, in curve No. 16, the vehicle-mounted sensor region 11 has Figure 3 (A) shows the design curve, the HUD display area 12 has Figure 4 (B) shows a design curve, but is not particularly limited and may have any curve.

[0176] In addition, it can also be as shown in curves No. 4 and 5 (refer to Fig.14 , 15 ), the HUD display area 12 is not set. In this case, if the Figure 7 As described above, it is preferable to have the one end side region 20 .

[0177] Furthermore, as shown by curve No. 1, there may be no portion where the wedge angle changes locally in the region other than the onboard sensor region 11, but as shown by curves Nos. 2 to 16, there may be a portion where the wedge angle changes locally.

[0178] Similarly, as shown by curves No. 1, 6, 7, and 11, there may be no portion with a local wedge angle change in the area outside the HUD display area 12 or in the area other than the vehicle-mounted sensor area 11 and the HUD display area 12, but there may be a portion with a local wedge angle change as shown by curves No. 2, 3, 8 to 10, and 12 to 16.

[0179] (Wedge angle of the entire interlayer film)

[0180] In one embodiment of the present invention, the thickness of one end 13A may be smaller than the thickness of the other end 13B, or the thickness of one end 13A may be larger than the thickness of the other end 13B. In the present invention, the average wedge angle of the intermediate film 10 is not particularly limited, but from the viewpoint of improving the detection accuracy in the vehicle-mounted sensor area 11 or improving the display accuracy in the HUD display area 12, it can be set to a certain value or less, for example, 0.9 mrad or less, preferably 0.7 mrad or less, more preferably 0.5 mrad or less, and further preferably 0.4 mrad or less.

[0181] The average wedge angle of the intermediate film 10 may be, for example, -0.3 mrad or more. However, from the viewpoint of improving the detection accuracy in the vehicle-mounted sensor area 11 or improving the display accuracy in the HUD display area 12, it is preferably not set to a large negative value, specifically, preferably -0.1 mrad or more, more preferably 0 mrad or more, further preferably 0.05 mrad or more, and further preferably 0.1 mrad or more.

[0182] The average wedge angle of the interlayer film 10 is an average value of local wedge angles in the entire interlayer film 10 measured from one end 13A to the other end 13B.

[0183] The interlayer film 10 preferably has a positive or negative slope in the approximate straight line L4 of the local wedge angle of the entire interlayer film from one end 13A to the other end 13B. If the slope of the approximate straight line L4 of the local wedge angle of the entire interlayer film is positive or negative, it means that the wedge angle changes in the longitudinal direction in the interlayer film 10. Therefore, by changing the wedge angle according to the longitudinal position, it is easy to improve the detection accuracy in the vehicle-mounted sensor area 11 or improve the display accuracy in the HUD display area 12. Here, from the viewpoint of reducing the reflected double image in the HUD display area 12 and improving the display accuracy of the HUD display area 12, the slope is preferably a negative value.

[0184] When the slope of the approximate straight line L4 of the local wedge angle of the entire interlayer film is negative, it is preferably -0.005 mrad / 100 mm or less, more preferably -0.008 mrad / 100 mm or less, further preferably -0.01 mrad / 100 mm or less, further preferably -0.015 mrad / 100 mm or less, and further preferably -0.1 mrad / 100 mm or more, further more preferably -0.05 mrad / 100 mm or more. By making the slope within the above range and appropriately changing the wedge angle, it is easy to improve the detection accuracy or display accuracy without hindering the visibility of the laminated glass.

[0185] In addition, when the slope of the approximate straight line L4 of the local wedge angle of the entire interlayer film is positive, it is preferably 0.003 mrad / 100 mm or more, more preferably 0.008 mrad / 100 mm or more, and further preferably 0.01 mrad / 100 mm or more, and further preferably 0.1 mrad / 100 mm or less, and further preferably 0.05 mrad / 100 mm or less. By making the slope of the approximate straight line L4 within the above range and appropriately changing the wedge angle, it is easy to improve the detection accuracy or display accuracy without hindering the visibility of the laminated glass.

[0186] It should be noted that the approximate straight line L4 can be calculated by the same method as the above-mentioned approximate straight line L1.

[0187] The thickness of the intermediate film 10 is not particularly limited, and is, for example, 100 μm to 2000 μm, preferably 200 μm to 1700 μm, and more preferably 300 μm to 1400 μm. By setting the thickness of the intermediate film to be above the lower limit, the impact resistance can be improved, and it is also easy to ensure the adhesion with the laminated glass component. On the other hand, by setting it to be below the upper limit, the thickness of the laminated glass can be prevented from becoming thicker than necessary.

[0188] In addition, the thickness of the intermediate film differs depending on the position in the longitudinal direction as described above, and the thickness of the intermediate film is the thickness of one end 13A of the intermediate film 10 .

[0189] (Material of interlayer film)

[0190] The intermediate film of the present invention is formed by a resin layer. The resin constituting the resin layer is preferably a thermoplastic resin. By using a thermoplastic resin for the intermediate film, the laminated glass components can be easily bonded via the intermediate film by thermocompression bonding. The intermediate film may be composed of a single resin layer or a plurality of resin layers.

[0191] As the thermoplastic resin used for the intermediate film, for example, (meth) acrylic resin, polyvinyl acetal resin, polyvinyl alcohol resin (PVA), polyurethane resin (PU), ethylene-vinyl acetate copolymer resin (EVA), ethylene-vinyl acetate copolymer saponification (EVOH), ethylene-methacrylic acid copolymer resin, ionomer resin, isobutylene resin, styrene-isoprene copolymer resin, styrene-butadiene copolymer resin, etc. can be listed. In each resin layer, the thermoplastic resin can be used alone or in combination of two or more. In addition, when a plurality of resin layers are provided, the thermoplastic resins of each resin layer can be of the same type or of different types.

[0192] Among the above, the thermoplastic resin is more preferably a polyvinyl acetal resin. By using a polyvinyl acetal resin, the impact resistance of the laminated glass can be easily improved, and the adhesiveness to the laminated glass member can be easily improved.

[0193] The polyvinyl acetal resin is not particularly limited as long as it is a polyvinyl acetal resin obtained by acetalizing polyvinyl alcohol (PVA) with aldehyde.

[0194] The aldehyde is not particularly limited, and generally, an aldehyde having 1 to 10 carbon atoms can be suitably used. The aldehyde having 1 to 10 carbon atoms is not particularly limited, and examples thereof include n-butyraldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexanal, n-octanal, n-nonanal, n-decanal, formaldehyde, acetaldehyde, benzaldehyde, etc. These aldehydes may be used alone or in combination of two or more.

[0195] Among the above, n-butyraldehyde, n-hexanal, and n-valeraldehyde are preferred, and n-butyraldehyde is more preferred. Therefore, the polyvinyl acetal resin is preferably a polyvinyl butyral resin.

[0196] The polyvinyl acetal resin generally has an acetal group, a hydroxyl group and an acetyl group in the side chain. The polyvinyl acetal resin is preferably an unmodified polyvinyl acetal resin, but may also be a modified polyvinyl acetal resin.

[0197] The modified polyvinyl acetal resin has a structure (modifying group) other than an acetal group, a hydroxyl group and an acetyl group, and preferably has a modifying group in a side chain. Examples of the modifying group include a modifying group having a polyalkylene oxide structure in a side chain, and a modifying group having an alkyl group (e.g., having approximately 2 to 30 carbon atoms) other than an acetal group and an acetyl group in a side chain.

[0198] In the interlayer film, the polyvinyl acetal resin may be used alone or in combination of two or more.

[0199] In addition, when the intermediate film has a plurality of resin layers, the thermoplastic resin constituting each resin layer is preferably a polyvinyl acetal resin. In addition, when the intermediate film has a plurality of resin layers, the thermoplastic resins of each resin layer may be the same type or different types.

[0200] The interlayer film preferably has a resin layer (hereinafter sometimes referred to as "first resin layer") having a glass transition temperature of 15°C or higher. By making the interlayer film include a resin layer having a glass transition temperature of 15°C or higher, it is easy to improve the penetration resistance, workability, mechanical properties, etc. of the interlayer film, and it can be suitably used as an interlayer film for laminated glass.

[0201] The glass transition temperature of the first resin layer is preferably 20° C. or higher, more preferably 30° C. or higher, and is, for example, 80° C. or lower, preferably 60° C. or lower, and more preferably 50° C. or lower.

[0202] Furthermore, when the intermediate film is a single layer, the glass transition temperature can be obtained by using the intermediate film as a measurement sample and measuring the viscoelasticity using a viscoelasticity measuring device. In addition, when the intermediate film is a multilayer, each layer can be peeled off from the intermediate film, and a measurement sample is prepared from each obtained layer, and the viscoelasticity is measured using a viscoelasticity measuring device to obtain the glass transition temperature.

[0203] The measured sample was stored at room temperature of 23±2°C and humidity of 25±5% for 12 hours. Next, the viscoelasticity was measured using the viscoelasticity measuring device "ARES-G2" manufactured by TA Instruments. A parallel plate with a diameter of 8 mm was used as a jig, and the measurement was performed in shear mode, at a cooling rate of 3°C / min from 100°C to -20°C, at a frequency of 1Hz and a strain of 1%. In the obtained measurement results, the peak temperature of the loss tangent was taken as the glass transition temperature Tg (°C).

[0204] When the interlayer film is multilayered, it may also include a second resin layer having a glass transition temperature of less than 15°C in addition to the first resin layer. By providing the interlayer film with a second resin layer having a glass transition temperature of less than 15°C, the sound insulation of the interlayer film can be easily improved. From the viewpoint of improving the sound insulation, the glass transition temperature of the second resin layer is preferably 10°C or less, more preferably 5°C or less, and further preferably 0°C or less. In addition, the glass transition temperature of the second resin layer is not particularly limited, but from the viewpoint of improving the mechanical properties such as the bending rigidity of the interlayer film, it is preferably -20°C or more.

[0205] The glass transition temperatures of the first and second resin layers can be adjusted by appropriately adjusting the type of resin used for the first resin layer, the resin composition, etc. For example, the glass transition temperature can be increased by increasing the amount of hydroxyl groups in the polyvinyl acetal resin.

[0206] When the resin used is a thermoplastic resin, each resin layer may further contain a plasticizer. When the resin layer contains a plasticizer, the interlayer film becomes soft, and as a result, the laminated glass also becomes soft. Furthermore, when the laminated glass component is an inorganic glass, the adhesion to the laminated glass component can also be improved. When a polyvinyl acetal resin is used as the thermoplastic resin, the plasticizer is particularly effective if it is contained in the resin layer containing the thermoplastic resin.

[0207] Examples of the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, and phosphorus plasticizers such as phosphate plasticizers and phosphite plasticizers. Among them, organic ester plasticizers are preferred, and triethylene glycol-di-2-ethylhexanoate (3GO) is particularly suitable.

[0208] The content of the plasticizer is not particularly limited, and is, for example, 10 parts by mass to 100 parts by mass, and preferably 25 parts by mass to 70 parts by mass, based on 100 parts by mass of the thermoplastic resin in each resin layer.

[0209] From the viewpoint of the handleability and mechanical strength of the intermediate film, the content of the plasticizer in the first resin layer is preferably relatively low, for example, from 10 parts by mass to 50 parts by mass, preferably from 20 parts by mass to 45 parts by mass, and more preferably from 25 parts by mass to 40 parts by mass, relative to 100 parts by mass of the thermoplastic resin.

[0210] From the viewpoint of improving the softness of the laminated glass and easily improving the penetration resistance or sound insulation, the content of the plasticizer in the second resin layer relative to 100 parts by mass of the thermoplastic resin is preferably greater than the content in the first resin layer relative to 100 parts by mass of the thermoplastic resin. Specifically, it is 25 parts by mass to 100 parts by mass, more preferably 45 parts by mass to 95 parts by mass, and even more preferably 50 parts by mass to 90 parts by mass.

[0211] Each resin layer preferably contains a thermoplastic resin or a thermoplastic resin and a plasticizer as main components. Specifically, the total amount of the thermoplastic resin and the plasticizer is preferably 50% by mass or more, more preferably 60% by mass or more, and preferably 65% ​​by mass or more and 100% by mass or less based on the total amount of each resin layer.

[0212] Each resin layer constituting the interlayer film may contain, in addition to the plasticizer, a known additive for the interlayer film. Specific examples of additives other than the plasticizer include colorants such as pigments and dyes, ultraviolet absorbers, infrared absorbers, heat shielding agents, antioxidants, light stabilizers, adhesion modifiers, fluorescent whitening agents, crystal nucleating agents, and the like.

[0213] (Laminated structure of interlayer film)

[0214] When the interlayer film is composed of a plurality of resin layers and has a first resin layer and a second resin layer, the interlayer film 10 is preferably Fig.11 As shown, the first resin layer 31 is provided on both surfaces of the second resin layer 32. With such a structure, the sound insulation can be improved, and the mechanical strength, penetration resistance, and adhesion to the laminated glass member of the interlayer film can be well maintained.

[0215] In addition, when the interlayer film 10 has the colored region 21 as described above, it is preferable that at least one resin layer of the interlayer film is made into a colored layer containing a colorant. In addition, the colorant used is not particularly limited, and pigments that have been mixed in the interlayer film in the past can be used, and pigments such as blue, yellow, red, green, purple, white, and black can be used. Pigments, dyes, etc. can be used as pigments. In the interlayer film, by using a colorant, the interlayer film can be colored to a desired color.

[0216] Examples of the pigment used for the interlayer film include carbon black, copper phthalocyanine pigments such as pigment blue, phthalocyanine pigments such as cobalt phthalocyanine pigments, anthraquinone pigments, perylene pigments, diketopyrrolopyrrole pigments, quinacridone pigments, perinone pigments, thioindigo pigments, isoindoline pigments, isoindolinone pigments, quinolinephthalone pigments, thionyl pigments, dioxazine pigments, indolizine pigments, fluorubine pigments, azo pigments, titanium oxide pigments, calcium carbonate pigments, metal oxide pigments, Ni complex pigments, and other metal complex pigments.

[0217] In addition, examples of dyes include azo dyes, cyanine dyes, triphenylmethane dyes, phthalocyanine dyes, anthraquinone dyes, naphthoquinone dyes, quinoneimine dyes, methine dyes, methine azo dyes, squarylium dyes, acridine dyes, styryl dyes, coumarin dyes, quinoline dyes, nitro dyes, etc. The dye may also be a disperse dye.

[0218] The pigments and dyes constituting the coloring agents mentioned above may be directly mixed into the resin, or may be mixed into the resin after being made into the form of ink or toner.

[0219] The content of the colorant used in the coloring layer is not particularly limited, and may be adjusted so that the visible light transmittance of at least a part of the region where the coloring layer is provided is less than 60%.

[0220] As described above, the colored region 21 is provided in a part of the intermediate film, and therefore the colored layer 33 is preferably provided in a part of the intermediate film 10. Specifically, for example, Fig.12 As shown, a laminated structure 35 having two resin layers 34, 34 and a coloring layer 33 disposed therebetween is partially provided. The coloring layer 33 preferably has a structure such as being embedded between the resin layers 34, 34. Furthermore, in the laminated structure 35, in a region where the coloring layer 33 does not exist, the resin layers 34, 34 are preferably integrated. Furthermore, the resin layers 34, 34 are not particularly limited, and are preferably the first resin layer described above. In addition, the coloring layer 33 may also be formed of a first resin layer having a glass transition temperature of 15°C or more.

[0221] The thickness of the coloring layer 33 may be constant, but generally speaking, it is preferable to have an area (gradient area 33X) where the thickness continuously decreases, or it may have a gradient area 33X and an area 33Y connected to the gradient area 33X and having a substantially constant thickness. Among them, the gradient area 33X may be omitted, and the area 33Y may also be omitted. When the intermediate film 10 has the area 33Y, the visible light transmittance in at least the area 33Y is less than 60%. In addition, the visible light transmittance may be less than 60% in a part or all of the gradient area 33X, or it may be more than 60% in the entire gradient area 33X. That is, in the intermediate film 10, a part or all of the area where the gradient area 33X is set may not be the coloring area 21.

[0222] In addition, when the colored layer 33 is provided, the number of layers in the region where the colored layer 33 is provided is not particularly limited, and may be other than three layers, for example, a four-layer structure or a five-layer structure. Fig.11 In the structure shown, a coloring layer 33 is preferably provided between a first resin layer 31 and a second resin layer 32. The coloring layer 33 is preferably Fig.12 In addition, in the case of a 5-layer structure, for example Fig.11 In the structure shown, import Fig.12 The resin layer 34 shown and the stacked structure 35 including the coloring layer 33 and the resin layer 34 may replace the first resin layer 31 .

[0223] (Surface shape of the interlayer film)

[0224] It is preferable that one or both surfaces of the intermediate film 10 have a concavo-convex shape. The surface of the intermediate film 10 is a surface that contacts the laminated glass members 17A and 17B in the laminated glass 16 .

[0225] The interlayer film 10 preferably has a ten-point average roughness of at least one surface of 1 μm or more and less than 100 μm. If the ten-point average roughness of the surface of the interlayer film 10 is within the above range, bubbles are less likely to form on the surface of the interlayer film 10 when the interlayer film is crimped to a laminated glass member. The ten-point average roughness is more preferably 5 μm or more and 85 μm or less, and further preferably 10 μm or more and 70 μm or less.

[0226] In addition, at least one surface of the interlayer film 10 preferably has an absolute value of the difference between the maximum value and the minimum value of the ten-point average roughness less than 40 μm. In the interlayer film 10, by setting the ten-point average roughness of its surface to the above-mentioned required range and making the absolute value of the difference between the maximum value and the minimum value of the ten-point average roughness smaller, bubbles are less likely to be generated on the entire surface of the interlayer film 10 when the interlayer film is pressure-bonded to a laminated glass member.

[0227] The absolute value of the difference between the maximum value and the minimum value of the ten-point average roughness is more preferably 30 μm or less, and further preferably 20 μm or less. In addition, the absolute value of the difference between the maximum value and the minimum value is not particularly limited, and from the perspective of ease of manufacture, for example, it can be 3 μm or more, preferably 5 μm or more, and further preferably 8 μm or more.

[0228] The ten-point average roughness is the ten-point average roughness (Rzjis94) measured in accordance with JIS B 0601-1994. As a measuring instrument for measuring the ten-point average roughness (Rzjis94), for example, "Surfcorder SE300" manufactured by Kosaka Laboratory Co., Ltd. can be used. More specifically, the ten-point average roughness (Rzjis94) can be measured using a stylus with a tip radius of 2 μm and a tip angle of 60°, under the measurement conditions of a critical value of 2.5 mm, a reference length of 2.5 mm, a measurement length of 12.5 mm, a preliminary length of 2.5 mm, and a stylus feed speed of 0.5 mm / sec, in an environment of 23°C and 30 RH%. In the case where a line-shaped embossing is given to the surface of the above-mentioned intermediate film, the ten-point average roughness (Rzjis94) is measured by feeding the stylus in a direction perpendicular to the line direction of the engraved lines.

[0229] In addition, in the present invention, Rzjis94 is measured at 10 points at equal intervals from one end 13A to the other end 13B, and the average value thereof is calculated. In addition, the maximum value and the minimum value of the measured Rzjis94 are selected, and the absolute value of the difference between the maximum value and the minimum value is calculated as the absolute value of the difference between the maximum value and the minimum value of the ten-point average roughness.

[0230] It is preferred that only one side of the surface of the intermediate film 10 has the above-mentioned ten-point average roughness and / or absolute value, but it is preferred that both sides have the above-mentioned ten-point average roughness and / or absolute value.

[0231] The method for forming the concavo-convex shape on the interlayer film is not particularly limited, and the concavo-convex shape may be formed on the interlayer film obtained by the following production method, for example, by a die lip embossing method, an embossing roll method, a calender roll method, or the like.

[0232] (Method for producing interlayer film)

[0233] The manufacturing method of the intermediate film is not particularly limited, and the intermediate film can be manufactured by the same manufacturing method as the method for manufacturing the previous wedge intermediate film, and the intermediate film is preferably molded by extrusion molding. Specifically, the resin constituting each resin layer or the resin composition containing additives such as plasticizers in addition to the resin can be extruded to form each resin layer. In addition, when the intermediate film has multiple layers of resin layers, it is preferably molded by coextrusion.

[0234] In the present invention, the maximum deviation S1 or the maximum value S2 of the absolute value of the difference between the local wedge angle and the approximate straight line L2 is reduced, but they can be reduced by, for example, manually or automatically adjusting the gap in each coordinate in the width direction of the die outlet during extrusion molding. In the case of automatically adjusting the gap at the die outlet, it is preferably adjusted by, for example, feedback control. Specifically, the thickness of the intermediate film in production is frequently measured inline, and the difference between the target thickness curve and the measured thickness curve is fed back to the die, and the gap at the die outlet is automatically adjusted in consideration of the difference in thickness. In addition, in the case of manually adjusting the gap, the maximum deviation S1 or the maximum value S2 can be reduced by increasing the adjustment frequency.

[0235] In the coextrusion, a coextruder including a plurality of extruders and a multilayer feed block may be used. The head end of each extruder of the coextruder is preferably connected to the multilayer feed block via a molten resin delivery pipe or the like.

[0236] In the co-extruder, the resin or resin composition used to form each resin layer is preferably supplied from each extruder to the multi-layer feed module via a molten resin delivery pipe, etc., and the multi-layer feed module is merged and co-extruded into a multi-layer intermediate film. At this time, the thickness of each resin layer can be set by appropriately adjusting the amount of extruded resin, etc. In addition, the maximum deviation S1 or the maximum value S2 can be adjusted at the die outlet.

[0237] Furthermore, if necessary, the gap width of the flow path through which each resin or resin composition passes may be adjusted in the extruder. In addition, the flow path of the die to be used is preferably plated in advance to facilitate the flow of the molten resin.

[0238] [Laminated glass]

[0239] The present invention further provides a laminated glass. As described above, the laminated glass 16 includes the first and second laminated glass members 17A, 17B and the interlayer film 10 disposed between the first and second laminated glass members 17A, 17B. The first and second laminated glass members 17A, 17B may be bonded to each other via the interlayer film 10.

[0240] (1st and 2nd laminated glass components)

[0241] As the first and second laminated glass members used in the laminated glass, glass plates can be cited. The glass plates can be any of inorganic glass and organic glass, but are preferably inorganic glass. The inorganic glass is not particularly limited, and can be cited as transparent glass, float plate glass, tempered glass, tinted glass, polished plate glass, embossed plate glass, wire mesh plate glass, wired plate glass, ultraviolet absorbing plate glass, infrared reflecting plate glass, infrared absorbing plate glass, green glass, etc.

[0242] In addition, as organic glass, what is generally called resin glass is used, and various organic glass plates such as polycarbonate plate, (meth) acrylic plate such as polymethyl methacrylate plate, polyester plate such as acrylonitrile styrene copolymer plate, acrylonitrile butadiene styrene copolymer plate, polyethylene terephthalate plate, fluorine resin plate, polyvinyl chloride plate, chlorinated polyvinyl chloride plate, polypropylene plate, polystyrene plate, polysulfone plate, epoxy resin plate, phenolic resin plate, unsaturated polyester resin plate, polyimide resin plate, etc. can be listed. The organic resin plate can also be appropriately subjected to surface treatment, etc.

[0243] The first and second laminated glass components may be made of the same material or other materials. For example, one may be inorganic glass and the other may be organic glass. However, it is preferred that both the first and second laminated glass components are inorganic glass or organic glass.

[0244] The thickness of each glass plate used for the first and second laminated glass members is not particularly limited, and is, for example, approximately 0.1 to 15 mm, preferably 0.5 to 5 mm. The thickness of each glass plate may be the same as or different from each other.

[0245] In addition, when the first and second laminated glass components have different thicknesses, the difference in thickness between them is 0.1 mm or more, preferably 0.2 mm or more. In addition, the difference in thickness between the first and second laminated glass components is not particularly limited, for example, 2 mm or less, preferably 1 mm or less.

[0246] The first and second laminated glass components may be flat glass or curved glass. In addition, when one of the first and second laminated glass components is flat glass, the other is also flat glass, and when one of the first and second laminated glass components is curved glass, the other is also curved glass.

[0247] The curved glass preferably has a longitudinal curvature radius of 4000 mm or more, more preferably 6000 mm or more, preferably 8000 mm or more, and preferably 25000 mm or less, more preferably 20000 mm or less, and preferably 15000 mm or less.

[0248] The method for producing laminated glass is not particularly limited, and it is preferred that the interlayer film is sandwiched between two laminated glass members and these are press-bonded to obtain the laminated glass.

[0249] More specifically, the interlayer film is sandwiched between the first and second laminated glass components, and the air remaining between the two glass components and the interlayer film is degassed by pressing rollers or placing them in a rubber bag for reduced pressure suction. Thereafter, preliminary bonding is performed at about 70 to 110°C to obtain a laminate. Next, the laminate is placed in an autoclave or pressurized and pressure-bonded at about 120 to 150°C and a pressure of 1 to 1.5 MPa. In this way, laminated glass can be obtained.

[0250] In the above description, the example of applying the laminated glass of the present invention to the front window glass of the automobile is specifically described, but the laminated glass of the present invention can also be applied to vehicles other than automobiles such as electric cars. In addition, it is not necessary to be applied to the front window glass of the vehicle and can also be applied to the window glass of vehicles other than the front window glass.

[0251] <Second embodiment>

[0252] In the above description, the interlayer film is applied to a laminated glass of a vehicle equipped with an in-vehicle sensor. However, before the interlayer film is applied to the laminated glass, it is sometimes unclear which area is the in-vehicle sensor area or the HUD display area.

[0253] However, as described above, an area of ​​100 to 200 mm in a range R3 of 600 to 1000 mm, preferably 700 to 1000 mm, from one end 13A toward the other end 13B (hereinafter also referred to as area A) is roughly the vehicle-mounted sensor area (see Fig.13 ) Therefore, in the intermediate film 10, when the position of the vehicle-mounted sensor region is unclear, it is preferable to regard the arbitrarily selected region A as the vehicle-mounted sensor region.

[0254] That is, in the second embodiment of the present invention, the intermediate film 10 is a film in which the maximum deviation of the local wedge angle from the approximate straight line L1 of the local wedge angle in the arbitrarily selected region A is 0.2 mrad or less.

[0255] Furthermore, Fig.13 Although the embodiment is shown based on the premise that the product width is 1000 mm, the product width is not particularly limited as long as it is 740 mm or more. If it is 740 mm or more, the details are as described in the first embodiment.

[0256] Similarly, an area of ​​200 to 500 mm in a range R4 of 100 to 600 mm from one end 13A toward the other end 13B (hereinafter also referred to as area B) is roughly the HUD display area (see Fig.13). Therefore, in the intermediate film 10, when the position of the HUD display area is unclear in addition to the vehicle-mounted sensor area, the area B is preferably regarded as the HUD display area.

[0257] Therefore, in the second embodiment, it is preferred that, in an arbitrarily selected area B, an area is selected within a range of 50 mm in one end direction and the other end direction with each point as the center, an approximate straight line of the local wedge angle in the area is used as an approximate straight line L2 of the local wedge angle of each point, and the maximum value of the absolute value of the difference between the local wedge angle and the approximate straight line L2 of each point is less than 0.2 mrad.

[0258] Furthermore, in the second embodiment, the area A and the area B are areas corresponding to the vehicle-mounted sensor area 11 and the HUD display area 12, respectively. Therefore, in the second embodiment, with respect to the configuration other than the configuration described above, the various provisions and contents described as the vehicle-mounted sensor area 11 in the first embodiment can also be regarded as the various provisions and contents of the area A in the second embodiment.

[0259] Likewise, the regulations and contents described as the HUD display area 12 in the second embodiment can be regarded as the regulations and contents of the area B in the second embodiment.

[0260] Note that the contents other than the vehicle-mounted sensor area 11 and the HUD display area 12 are the same as those of the first embodiment, and thus description thereof will be omitted.

[0261] Furthermore, a plurality of regions A can be selected in range R3, but one of the regions A preferably satisfies the above-described requirements. Similarly, a plurality of regions B can be selected in range R4, but one of the regions B preferably satisfies the above-described requirements.

[0262] Example

[0263] Hereinafter, the present invention will be described in further detail with reference to Examples, but the present invention is not limited to these Examples at all.

[0264] [Example 1A]

[0265] (Production of interlayer film)

[0266] A resin composition was obtained by mixing 40 parts by mass of a plasticizer (3GO) with 100 parts by mass of a polyvinyl acetal resin (average degree of polymerization 1700, hydroxyl content 30.3 mol%, acetalization degree 68.8 mol%, acetyl content 0.9 mol%). The design curve DP (refer to Fig.14), using a die, the resin composition is extruded under the condition that the gap at the die outlet is asymmetric with respect to the width direction, and the gap at the die outlet is manually adjusted in such a way that the measured curve does not deviate from the designed curve DP, and a wedge intermediate film is obtained at the same time. In the extrusion molding, the longitudinal direction is TD and the transverse direction is MD. The obtained wedge intermediate film is embossed by an embossing roller method, and then cut in such a way that the product width (longitudinal length) is 1000mm and the transverse length is 1000mm, thereby obtaining the wedge intermediate film of Example 1A. The ten-point average roughness (Rzjis94) of each surface of the wedge intermediate film is 47μm, and the absolute value of the difference between the maximum and minimum values ​​of the ten-point average roughness is 5μm. In addition, the glass transition temperature of the wedge intermediate film is 27°C. Furthermore, the intermediate film of Example 1A is a film assumed to have a vehicle-mounted sensor area and a HUD display area, and the positions of the assumed vehicle-mounted sensor area and the HUD display area are shown in the table.

[0267] With respect to the obtained wedge-intermediate film, the local wedge angle was measured in the longitudinal direction according to the method described in the specification, and each predetermined value shown in the table was obtained based on the measured local wedge angle.

[0268] (Manufacturing of laminated glass)

[0269] The obtained intermediate film was sandwiched between two transparent glasses (1000 mm long × 1000 mm wide × 2.5 mm thick) to obtain a laminate. The laminate was placed in a rubber bag, degassed at a vacuum degree of 2.6 kPa for 20 minutes, and then moved into an oven while maintaining the degassed state, and then vacuum-pressed at 90°C for 30 minutes to pre-press the laminate. The pre-pressed laminate was pressed for 20 minutes in an autoclave at 135°C and a pressure of 1.2 MPa to obtain a laminated glass. The visible light transmittance of each position of the obtained laminated glass was 88%.

[0270] [Examples 1B, 1C, Comparative Example 1]

[0271] Example 1B was implemented in the same manner as Example 1A except that the adjustment frequency of the die outlet gap was changed. Example 1C was implemented in the same manner as Example 1A except that the adjustment of the die outlet gap was changed to feedback control. Comparative Example 1 was implemented in the same manner as Example 1A except that the adjustment frequency of the die outlet gap was changed.

[0272] [Examples 2A to 2C, Comparative Example 2]

[0273] In addition to the design curve DP with local wedge angle No.2 (refer to Fig.14 ) were used, except that the extrusion molding was performed in the same manner as in Examples 1A to 1C and Comparative Example 1.

[0274] [Examples 3A to 3C, Comparative Example 3]

[0275] In addition to the design curve DP with a local wedge angle of No.3 (ref. Fig.14 ) were used, except that the extrusion molding was performed in the same manner as in Examples 1A to 1C and Comparative Example 1.

[0276] [Examples 4A to 4C, Comparative Example 4]

[0277] In addition to the design curve DP with a local wedge angle of No.4 (ref. Fig.14 ) were extruded in the same manner as in Examples 1A to 1C and Comparative Example 1. Examples 4A to 4C and Comparative Example 4 are examples of intermediate films that are assumed to have an onboard sensor region but do not have a HUD display region.

[0278] [Examples 5A to 5C, Comparative Example 5]

[0279] In addition to the design curve DP with a local wedge angle of No.5 (ref. Fig.15 ) were extruded in the same manner as in Examples 1A to 1C and Comparative Example 1. Examples 5A to 5C and Comparative Example 5 are examples of intermediate films that are assumed to have an onboard sensor region but do not have a HUD display region.

[0280] [Examples 6A to 6C, Comparative Example 6]

[0281] In addition to the design curve DP with a local wedge angle of No.6 (ref. Fig.15 ) were used, except that the extrusion molding was performed in the same manner as in Examples 6A to 6C and Comparative Example 6.

[0282] [Examples 7A to 7C, Comparative Example 7]

[0283] In addition to the design curve DP with a local wedge angle of No.7 (ref. Fig.15 ) were used, except that the extrusion molding was performed in the same manner as in Examples 1A to 1C and Comparative Example 1.

[0284] [Examples 8A to 8C, Comparative Example 8]

[0285] In addition to the design curve DP with a local wedge angle of No.8 (ref. Fig.15 ) were used, except that the extrusion molding was performed in the same manner as in Examples 1A to 1C and Comparative Example 1.

[0286] [Examples 9A to 9C, Comparative Example 9]

[0287] In addition to the design curve DP with a local wedge angle of No.9 (ref. Fig.16) were used, except that the extrusion molding was performed in the same manner as in Examples 1A to 1C and Comparative Example 1.

[0288] [Examples 10A to 10C, Comparative Example 10]

[0289] In addition to the design curve DP with a local wedge angle of No.10 (ref. Fig.16 ) were used, except that the extrusion molding was performed in the same manner as in Examples 1A to 1C and Comparative Example 1.

[0290] [Examples 11A to 11C, Comparative Example 11]

[0291] In addition to the design curve DP with local wedge angle No.11 (ref. Fig.16 ) were used, except that the extrusion molding was performed in the same manner as in Examples 1A to 1C and Comparative Example 1.

[0292] [Examples 12A to 12C, Comparative Example 12]

[0293] In addition to the design curve DP with a local wedge angle of No.12 (ref. Fig.16 ) were used, except that the extrusion molding was performed in the same manner as in Examples 1A to 1C and Comparative Example 1.

[0294] [Examples 13A to 13C, Comparative Example 13]

[0295] In addition to the design curve DP with local wedge angle No.13 (ref. Fig.17 ) were used, except that the extrusion molding was performed in the same manner as in Examples 1A to 1C and Comparative Example 1.

[0296] [Examples 14A to 14C, Comparative Example 14]

[0297] In addition to the design curve DP with a local wedge angle of No.14 (ref. Fig.17 ) were used, except that the extrusion molding was performed in the same manner as in Examples 1A to 1C and Comparative Example 1.

[0298] [Examples 15A to 15C, Comparative Example 15]

[0299] In addition to the design curve DP with a local wedge angle of No.15 (ref. Fig.17 ) were used, except that the extrusion molding was performed in the same manner as in Examples 1A to 1C and Comparative Example 1.

[0300] [Example 16A]

[0301] A first resin composition was obtained by mixing 40 parts by mass of a plasticizer (3GO) with respect to 100 parts by mass of a polyvinyl acetal resin. A second resin composition was obtained by mixing 40 parts by mass of a plasticizer (3GO) and calcium carbonate (inorganic pigment, weight average particle size 5.0 μm) as a colorant with respect to 100 parts by mass of a polyvinyl acetal resin so that the content was 5.9% by mass in 100% by weight of the composition (and in the obtained colored layer).

[0302] The first resin composition is supplied to the first extruder. In addition, the second resin composition is supplied to the second extruder. A multilayer feed module is installed at the head end of the first molten resin delivery pipe connected to the head end of the first extruder and the head end of the second molten resin delivery pipe connected to the head end of the second extruder, and the amount of each resin composition to be extruded is adjusted, and co-extrusion is performed simultaneously, thereby obtaining the following Fig.12 The interlayer film shown has a laminated structure 35 in which a colored layer 33 is embedded between resin layers 34, 34 in a partial region. At this time, the gap at the die outlet is manually adjusted so that the measured curve does not deviate from the designed curve DP, and a wedge interlayer film is obtained.

[0303] Thereafter, laminated glass was produced after embossing in the same manner as in Example 1. The product width of the wedge-shaped interlayer film was 1800 mm, and accordingly, a glass of 1800 mm×1000 mm was used as the clear glass when obtaining the laminated glass.

[0304] The interlayer film of Example 16A is a film that assumes a vehicle sensor region, a HUD display region, and a tinted region, and the positions of the assumed vehicle sensor region, HUD display region, and tinted region are shown in the table. In addition, in the obtained laminated glass, the visible light transmittance of the region with the lowest visible light transmittance in the tinted region 21 is 8%. On the other hand, the visible light transmittance of the region where the tinted layer 33 is not provided is 88%.

[0305] [Examples 16B, 16C, Comparative Example 16]

[0306] Example 16B was implemented in the same manner as Example 16A except that the adjustment frequency of the die outlet gap was changed. Example 16C was implemented in the same manner as Example 16A except that the adjustment of the die outlet gap was changed to feedback control. Comparative Example 16 was implemented in the same manner as Example 1A except that the adjustment frequency of the die outlet gap was changed.

[0307] <Evaluation Method>

[0308] [Transmitted double image of vehicle-mounted sensor]

[0309] The laminated glass obtained in each example and comparative example was evaluated as follows. The object at the distance shown in each example and comparative example was visually checked from a position 10 cm from the glass surface toward the opposite side of the object in the vehicle-mounted sensor area to evaluate the presence or absence of a transmitted double image. The observation results of 100 evaluators were evaluated according to the following evaluation criteria.

[0310] A: The number of observers of the transmitted double image is less than 20.

[0311] B: The number of people who can see the double image is more than 20 and less than 50

[0312] C: The number of people who can see the double image is 50 or more but less than 80.

[0313] D: More than 80 people should be able to see the double image

[0314] [The largest reflected double image in the HUD image]

[0315] The laminated glass obtained in each embodiment and comparative example was evaluated as follows. An image was projected onto the HUD display area from a HUD display device (the vertical field of view (FOV) of the HUD display image was 2.5°, and the focal length was 3m), and 100 evaluators observed the HUD display area from a position 1000mm away from the inner surface of the laminated glass, and evaluated according to the following evaluation criteria.

[0316] A: Less than 20 people can see the double reflection image

[0317] B: The number of people who see the reflected double image is more than 20 and less than 50

[0318] C: The number of people who can see the double reflection image is more than 50 and less than 80

[0319] D: The number of people who can see the reflected double image is more than 80

[0320]

[0321]

[0322]

[0323]

[0324] As shown in the above tables, in each embodiment, by reducing the maximum deviation S1 of the local wedge angle from the approximate straight line L1 obtained in the vehicle-mounted sensor area, it is possible to suppress the transmission double image in the observation image based on the light incident on the vehicle-mounted sensor through the vehicle-mounted sensor area. In contrast, in each comparative example, the maximum deviation S1 is large, so the transmission double image cannot be fully suppressed in the observation image of the vehicle-mounted sensor.

[0325] In the embodiment where the maximum value S2 of the absolute value of the difference between the approximate straight line L2 and the local wedge angle obtained in the HUD display area is 0.2 mrad or less, a HUD image with suppressed generation of reflected double images can be displayed in the HUD display area.

[0326] Description of the accompanying drawings

[0327] 10: Interlayer film for laminated glass

[0328] 11: Vehicle sensor area

[0329] 12: HUD display area

[0330] 13A: One end

[0331] 13B: The other end

[0332] 16: Laminated glass

[0333] 17A, 17B: Laminated glass components

[0334] 19: Shielding

[0335] 20: One end side area

[0336] 21: Coloring area

[0337] 31: 1st resin layer

[0338] 32: Second resin layer

[0339] 33: Coloring layer

[0340] 34: Resin layer

[0341] DP: Design curve

[0342] AP: measured curve

[0343] L1, L2: approximate straight line

[0344] S1: Maximum deviation

[0345] S2: The maximum absolute value of the difference between the local wedge angle and the approximate straight line L2

[0346] α: Wedge angle

Claims

1. An interlayer film for laminated glass, comprising: an in-vehicle sensor region; wherein a maximum deviation of a local wedge angle in the in-vehicle sensor region from an approximate straight line L1 of the local wedge angle is 0.2 mrad or less.

2. An interlayer film for laminated glass, having a length from one end to the other end of 740 mm or more, wherein a maximum deviation of a local wedge angle from an approximate straight line L1 of a local wedge angle in an area A having a size of 100 to 200 mm in a range of 600 to 1000 mm from the one end toward the other end is 0.2 mrad or less. 3 . The interlayer film for laminated glass according to claim 1 , wherein the slope of the approximate straight line L1 is 0.7 mrad / 100 mm or less. 4 . The interlayer film for laminated glass according to claim 1 , wherein an average value of the local wedge angles in the vehicle-mounted sensor region or the region A is 0.1 mrad or more. 5 . The interlayer film for laminated glass according to claim 1 , wherein an average value of the local wedge angles in the vehicle-mounted sensor region or the region A is not less than −0.05 mrad and less than 0.05 mrad. 6 . The interlayer film for laminated glass according to claim 1 , wherein an average value of the local wedge angles in the vehicle-mounted sensor region or the region A is less than −0.1 mrad. 7 . The interlayer film for laminated glass according to claim 1 , further comprising a portion where a wedge angle changes locally in a region outside the vehicle-mounted sensor region or a region outside the region A.

8. The interlayer film for laminated glass according to claim 1, comprising a HUD display area, A portion having a local wedge angle change is provided outside the HUD display area. 9 . The interlayer film for laminated glass according to claim 2 , comprising a portion where the wedge angle changes locally outside a region B having a size of 200 to 500 mm in a range of 100 to 600 mm from the one end toward the other end.

10. The interlayer film for laminated glass according to claim 1, comprising a HUD display area. An absolute value of a difference between an average value of local wedge angles in the HUD display region and an average value of local wedge angles in the onboard sensor region is 0.01 mrad or more.

11. The interlayer film for laminated glass according to claim 2, wherein the absolute value of the difference between the average value of the local wedge angle in the region B having a size of 200 to 500 mm in a range of 100 to 600 mm from the one end toward the other end and the average value of the local wedge angle in the region A is 0.01 mrad or more.

12. The interlayer film for laminated glass according to claim 1, comprising a HUD display area. In the HUD display area, an area is selected with each point as the center within a range of 50 mm in one end direction and the other end direction, and an approximate straight line of the local wedge angle in the area is used as an approximate straight line L2 of the local wedge angle of each point. The HUD display area has a portion where the absolute value of the slope of the approximate straight line L2 is less than 0.005 mrad / 100 mm.

13. The interlayer film for laminated glass according to claim 2, wherein in a region B having a size of 200 to 500 mm in any one of a range of 100 to 600 mm from the one end toward the other end, a region is selected with each point as the center within a range of 50 mm in the one end direction and the other end direction, and an approximate straight line of the local wedge angle in the region is used as an approximate straight line L2 of the local wedge angle at each point, and the region B has a portion where the absolute value of the slope of the approximate straight line L2 is less than 0.005 mrad / 100 mm.

14. The interlayer film for laminated glass according to claim 1, comprising a HUD display area. In the HUD display area, an area is selected with each point as the center within a range of 50 mm in one end direction and the other end direction, and an approximate straight line of the local wedge angle in the area is used as an approximate straight line L2 of the local wedge angle of each point. The HUD display area has a portion where the slope of the approximate straight line L2 is less than -0.005 mrad / 100 mm.

15. The interlayer film for laminated glass according to claim 2, wherein in a region B having a size of 200 to 500 mm in any one of a range of 100 to 600 mm from the one end toward the other end, a region is selected with each point as the center within a range of 50 mm in the one end direction and the other end direction, and an approximate straight line of the local wedge angle in the region is used as an approximate straight line L2 of the local wedge angle at each point, and the region B has a portion where the slope of the approximate straight line L2 is less than -0.005 mrad / 100 mm. 16 . The interlayer film for laminated glass according to claim 1 , wherein an approximate straight line L4 of the local wedge angle of the entire interlayer film from the one end to the other end has a positive or negative slope.

17. The interlayer film for laminated glass according to claim 1, comprising a HUD display area. In the HUD display area, an area is selected with each point as the center within a range of 50 mm in one end direction and the other end direction, and an approximate straight line of the local wedge angle in the area is used as an approximate straight line L2 of the local wedge angle of each point, and the maximum value of the absolute value of the difference between the local wedge angle and the approximate straight line L2 of each point is less than 0.2 mrad.

18. The interlayer film for laminated glass according to claim 2, wherein in a region B having a size of 200 to 500 mm in any one of a range of 100 to 600 mm from the one end toward the other end, a region is selected with each point as the center within a range of 50 mm in the one end direction and the other end direction, an approximate straight line of the local wedge angle in the region is used as an approximate straight line L2 of the local wedge angle at each point, and the maximum value of the absolute value of the difference of the local wedge angle with respect to the approximate straight line L2 at each point is 0.2 mrad or less.

19. The interlayer film for laminated glass according to claim 1, which does not have a HUD display area. The average value of the local wedge angle of the region from one end toward the other end of the interlayer film for laminated glass to the on-vehicle sensor region differs from the average value of the local wedge angle of the on-vehicle sensor region by 0.001 mrad or more. 20 . The interlayer film for laminated glass according to claim 1 , comprising a colored region having a visible light transmittance of less than 60%, wherein an average value of local wedge angles of the colored region is 0.6 mrad or less.

21. The interlayer film for laminated glass according to claim 1 or 2, wherein on at least one surface, a ten-point average roughness (Rzjis94) is 1 μm or more and less than 100 μm, and an absolute value of a difference between a maximum value and a minimum value of the ten-point average roughness is less than 40 μm. 22 . A laminated glass comprising the interlayer film for laminated glass according to claim 1 or 2 , a first laminated glass member, and a second laminated glass member, wherein the interlayer film for laminated glass is disposed between the first laminated glass member and the second laminated glass member. 23 . The laminated glass according to claim 22 , wherein the first laminated glass member and the second laminated glass member have different thicknesses from each other, with the difference being 0.1 mm or more. 24 . A method for producing an interlayer film for laminated glass, which is the method for producing an interlayer film for laminated glass according to claim 1 or 2, wherein the interlayer film for laminated glass is molded by extrusion molding.

25. A method for producing laminated glass, the method for producing laminated glass according to claim 22, comprising sandwiching the interlayer film for laminated glass between two laminated glass members and press-bonding them to obtain laminated glass.

Images