Laminated glass for vehicles

Abstract

This laminated glass for a vehicle, in which a first glass plate and a second glass plate are joined by an interlayer film, is characterized in that the first glass plate has a first main surface and a second main surface on the interlayer film side, includes a first region including the second glass plate and a second region not including the second glass plate in a plan view, and has a filling part which is continuously disposed between the first glass plate and the second glass plate in the first region from the second main surface side of the second region to intersect all the boundaries between the first region and the second region, and includes a radio wave transmission member, wherein the second region has a higher transmittance in millimeter radio waves than the first region.

Description

[Technical field]

[0001] The present invention relates to a laminated glass for vehicles. [Background technology]

[0002] In recent years, in addition to communications using wavelength bands such as microwaves and millimeter waves, there has been a movement to expand high-speed, large-capacity communications infrastructure, such as fourth-generation mobile communications systems (hereinafter referred to as "4G") LTE and fifth-generation mobile communications systems (hereinafter referred to as "5G"), and the bands in use are tending to expand from the 3 GHz band to the 5-100 GHz band.

[0003] For such high-frequency band communication, for example, when a millimeter-wave radar installed inside a vehicle transmits and receives signals between the vehicle and a system outside the vehicle, gain attenuation due to the window glass is observed, which was not noticeable in the comparatively low-frequency band communication up to now. Therefore, for example, in order to obtain high gain in a system in which a millimeter-wave radar transmits and receives signals between the inside and outside of the vehicle through the window glass, a configuration is known in which a radio-transmitting material is embedded in part of the window glass (see Patent Document 1).

[0004] In particular, the window member in Patent Document 1 discloses various configurations for enhancing the transmittance of millimeter wave radar.For example, the window member in Patent Document 1 discloses a configuration in which, of a laminated glass having two sheets of glass with an interlayer film sandwiched between them, a radio wave transparent material is provided in a portion where one of the sheets of glass and the interlayer film has been removed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2017 / 188415 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the window member in Patent Document 1 includes a radio wave transparent material, there is a concern that the strength of the boundary between the ordinary laminated glass and the portion including the radio wave transparent material will decrease when viewed in a plan view of the glass, and the document fails to disclose a specific configuration for suppressing this decrease in strength.

[0007] In view of the above, an object of the present invention is to provide a laminated glass for vehicles having a more specific configuration which suppresses a decrease in strength at a boundary between different materials in a plan view and has excellent radio wave transmittance for a specified millimeter wave radar or the like. [Means for solving the problem]

[0008] The laminated glass for vehicles of the present invention that solves the above-mentioned problems is a laminated glass for vehicles in which a first glass sheet and a second glass sheet are joined together with an interlayer film, the first glass sheet has a first main surface and a second main surface, the second glass sheet has a third main surface and a fourth main surface, the second main surface and the third main surface are surfaces on the interlayer film side, the laminated glass has, in a plan view of the first glass sheet, a first region including the second glass sheet and a second region not including the second glass sheet, and has a filling portion that is continuously arranged between the first glass sheet and the second glass sheet in the first region from the second main surface side so as to intersect all of the boundaries between the first region and the second region, the filling portion includes a radio wave transparent member, and the second region has a higher transmittance for millimeter wave radio waves than the first region.

[0009] Alternatively, the laminated glass for vehicles of the present invention that solves the above-mentioned problems is a laminated glass for vehicles in which a first glass sheet and a second glass sheet are joined together with an interlayer film, the first glass sheet has a first main surface and a second main surface, the second glass sheet has a third main surface and a fourth main surface, the second main surface and the third main surface are surfaces on the interlayer film side, and in a plan view of the first glass sheet, the first glass sheet has a first region including the second glass sheet and a second region not including the second glass sheet, and the interlayer film is The second region is continuously arranged so as to overlap the entire second region and intersect with all of the boundaries between the first region and the second region when viewed in a plan view of the lath plate, and has a filling portion only on the second main surface side of the second region, and the filling portion has a radio wave transparent material and an adhesive layer on a surface facing the second main surface of the radio wave transparent material, and in the second region, the first glass plate, the intermediate film, the adhesive layer and the radio wave transparent material are laminated in this order, and the second region has a higher transmittance for millimeter wave radio waves than the first region.

[0010] Alternatively, the laminated glass for vehicles of the present invention that solves the above-mentioned problems is a laminated glass for vehicles in which a first glass sheet and a second glass sheet are joined together with an interlayer film, the first glass sheet has a first main surface and a second main surface, the second glass sheet has a third main surface and a fourth main surface, the second main surface and the third main surface are surfaces on the interlayer film side, in a plan view of the first glass sheet, the glass has a first region including the second glass sheet and a second region not including the second glass sheet, and a filling portion is provided only on the second main surface side of the second region, the filling portion including a radio wave transparent member, the radio wave transparent member being adjacent to the second main surface, an inner end face of the interlayer film, and an inner end face of the second glass sheet, and comprising at least one urethane resin layer, and the second region has a higher millimeter wave transmittance than the first region. Effect of the Invention

[0011] The laminated glass for vehicles of the present invention suppresses a decrease in strength at a boundary between different materials when viewed in a plan view, and is excellent in radio wave transmission for a predetermined millimeter wave radar and the like. [Brief description of the drawings]

[0012] [Figure 1] Fig. 1(a) is an exploded perspective view showing the structure of the laminated glass for vehicles according to the first embodiment. Fig. 1(b) is a perspective view showing a cut-out portion of a second glass of the laminated glass for vehicles according to the first embodiment. Fig. 1(c) is a perspective view showing a cut-out portion of the second glass of the laminated glass for vehicles according to the first embodiment. [Diagram 2] FIG. 2 is a plan view of a first glass plate of the laminated glass for vehicles according to the first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view of the laminated glass for vehicles according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view of a laminated glass for vehicles according to a first modified example of the first embodiment. [Diagram 5] FIG. 5 is a cross-sectional view of a laminated glass for vehicles according to a second modified example of the first embodiment. [Figure 6] FIG. 6 is a cross-sectional view of a laminated glass for vehicles according to a third modified example of the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view of a laminated glass for vehicles according to a fourth modified example of the first embodiment. [Figure 8] FIG. 8 is a cross-sectional view of a laminated glass for vehicles according to a fifth modified example of the first embodiment. [Figure 9] FIG. 9 is a cross-sectional view of the laminated glass for vehicles according to the second embodiment. [Figure 10] FIG. 10 is a cross-sectional view of the laminated glass for vehicles according to the third embodiment. [Figure 11] FIG. 11 is a cross-sectional view of the laminated glass for vehicles according to the fourth embodiment. [Figure 12] FIG. 12 is a conceptual diagram showing a state in which the laminated glass for vehicles according to the present invention is installed in an opening formed in the front of an automobile. [Figure 13] FIG. 13 is an enlarged view of a portion S in FIG. [Figure 14]FIG. 14 is a diagram showing the measurement results of the transmittance T(F) of radio waves with a frequency F(GHz) incident at an incident angle of 67.5° for the laminated glasses for vehicles of the examples and the comparative examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the embodiments of the present invention will be described in detail, but the embodiments of the present invention are not limited to those described below. In addition, in the following drawings, members and parts having the same function may be described with the same reference numerals, and duplicated descriptions may be omitted or simplified. In addition, the embodiments described in the drawings are schematic in order to clearly explain the present invention, and do not necessarily accurately represent the size or scale of the actual product.

[0014] 2. Description of the Related Art Laminated glass, which has a structure in which an interlayer film such as a resin is sandwiched or bonded between multiple sheets of glass, is safer as it causes fewer glass fragments to scatter when broken by an external impact. For this reason, it has been widely used as window glass in vehicles such as automobiles and trains, aircraft, buildings, and the like.

[0015] In particular, laminated glass for automobiles is required to satisfy the specified impact resistance and penetration resistance stipulated in JIS standard R3211:2015 (automotive safety glass). JIS standard R3212:2015 (automotive safety glass test method) stipulates the method of impact resistance test and penetration resistance test using a steel ball of a specified mass. In this specification, the impact resistance test and the penetration resistance test are collectively referred to as the "drop ball test".

[0016] Impact resistance testing is a test to check whether or not safety glass, such as laminated glass for automobiles, has the necessary adhesion or strength to withstand the impact of small, hard flying objects. Specifically, the test is performed by holding the laminated glass (safety glass) at a specified temperature, placing it on a support frame with the glass side facing the outside of the vehicle facing up, and allowing a steel ball to drop naturally from a specified height.

[0017] The penetration resistance test is a test to check whether the laminated glass used for the front window has the necessary penetration resistance. Specifically, the test is performed by holding the laminated glass (safety glass) at a specified temperature, placing it on a support frame with the glass side facing the inside of the car facing up, and dropping a steel ball from a specified height onto it.

[0018] Hereinafter, a specific configuration of the laminated glass for vehicles according to the present invention will be described, on the premise that the laminated glass satisfies a predetermined standard based on a ball drop test, and further has excellent radio wave transmittance for millimeter wave radar and the like.

[0019] (First embodiment) Hereinafter, a first embodiment of the laminated glass for vehicles according to the present invention will be described in detail with reference to Fig. 1 to Fig. 8. Among these, a modified example of the first embodiment of the laminated glass for vehicles according to the present invention will be described in detail with reference to Fig. 4 to Fig. 8.

[0020] Fig. 1(a) is an exploded perspective view showing the structure of a laminated glass for vehicles according to this embodiment, and Fig. 1(b) and Fig. 1(c) are perspective views of a second glass plate 17 of a laminated glass for vehicles 10 according to this embodiment. Fig. 2 is a plan view of a first glass plate 11 of the laminated glass for vehicles according to this embodiment. Laminated glass refers to a laminate having two or more glass plates, which are bonded together with an interlayer film.

[0021] Hereinafter, unless otherwise specified, the laminated glass for vehicles according to this embodiment will be described as having a basic structure of two glass sheets and one interlayer film between them, but multiple interlayer films may be used. Note that the plan view of the first glass sheet 11 refers to the first glass sheet 11 of the laminated glass for vehicles placed on a horizontal plane with the first glass sheet 11 facing up and viewed vertically from above.

[0022] 1(a), the laminated glass 10 for vehicles according to this embodiment is a laminate including a first glass plate 11, an interlayer film 12, a second glass plate 17, and a filling portion 13 described below. Note that the laminated glass 10 for vehicles is often curved along the body of the vehicle, but may have any shape appropriate for the application, and may be, for example, a flat, uncurved shape.

[0023] Moreover, in a plan view of the first glass plate 11, the laminated glass for vehicles 10 has a first region A including the second glass plate 17 and a second region B including no second glass plate 17. Unless otherwise specified, hereinafter, the laminated glass for vehicles 10 will be described on the assumption that the first glass plate 11 is located on the outer side of the vehicle and the second glass plate 17 is located on the inner side of the vehicle when the laminated glass for vehicles 10 is attached to the body of the vehicle.

[0024] The second region B is formed in a portion of the laminated glass 10 for vehicles that requires high radio wave transmission for radio waves having a frequency of 60 GHz to 100 GHz. For example, the second region B is formed in the vicinity including the portion where a millimeter wave radar is transmitted and received. In this specification, evaluations such as high / low radio wave transmission refer to radio wave transmission for radio waves having a frequency of 60 GHz to 100 GHz, unless otherwise specified.

[0025] The laminated glass for vehicles 10 has one second region B that is substantially rectangular in plan view of the first glass plate 11, but the shape (outer edge in plan view) and the number of the second region B are not limited to this configuration. For example, taking into consideration the arrangement of a millimeter wave radar, a stereo camera, and the like that are mounted on the vehicle interior side of the second glass plate 17, the shape of the second region B may be appropriately determined to be a polygon such as a triangle, a rectangle, or a substantially trapezoid, or a circle in plan view of the first glass plate 11.

[0026] In the laminated glass 10 for vehicles, the area of ​​the second region B is 400 mm 2 in a plan view so that the information device can detect radio waves in the millimeter wave band. 2 It is preferable that the length is more than 1000 mm. 2The above is more preferable. Furthermore, the second area B in one place is intended for transmission and reception of millimeter wave electric waves (signals) from a plurality of information devices to the area, and therefore, 2 More preferably, 10,000 mm 2 The above is particularly preferable. In addition, even if an external force is applied to the center of the second region B, the area of ​​the second region B is set to 90,000 mm or less so that excessive deformation does not occur. 2 The following is preferred:

[0027] It is preferable that the second area B is located outside the "test area A" specified in the annex "Test area for optical properties and light resistance of safety glass" of JIS standard R3212:2015 (Test method for automotive safety glass), since the boundary between the first area A and the second area B is outside the field of view of the driver. In the case of large vehicles, it is preferable that the second area B is located outside the "test area I", since the boundary between the first area A and the second area B is outside the field of view of the driver.

[0028] The thickness of the first glass plate 11 is required to be 1.1 mm or more, preferably 1.5 mm or more, and more preferably 1.8 mm or more, in order to ensure strength, particularly to increase resistance to flying stones. Although there is no particular upper limit on the thickness of the first glass plate 11, the weight increases as the thickness increases, so that a thickness of 3.0 mm or less is usually preferable.

[0029] As shown in FIG. 1(a), in the laminated glass 10 for vehicles according to this embodiment, the first glass sheet 11 has a first main surface 11a and a second main surface 11b, and the interlayer film 12 is adjacent to the second main surface 11b. Similarly, the second glass sheet 17 has a third main surface 17c and a fourth main surface 17d, and the interlayer film 12 is adjacent to the third main surface 17c. The second glass sheet 17 has a recessed portion in a part of the glass sheet, and overlaps with the second region B. The second glass sheet 17 may have a notch portion in a part of the glass sheet, and overlaps with the second region B.

[0030] The hollow portion of the second glass plate 17 will be described with reference to Fig. 1(b). The hollow portion 18x refers to a portion of the second region B when the outer edge of the first glass plate 11 is not in contact with the second region B in a plan view of the first glass plate 11 in the laminated glass 10 for vehicles.

[0031] Next, the cutout portion of the second glass plate 17 will be described with reference to Fig. 1(c). The cutout portion 18y refers to a portion of the second region B when a part of the outer edge of the first glass plate 11 is adjacent to the second region B in a plan view of the first glass plate 11 in the vehicle laminated glass 10.

[0032] 1(c) shows, by way of example, a part of the outer edge of the first glass plate 11 as a broken line for the second glass plate 17. That is, in the laminated glass 10 for vehicles having the second glass plate 17 shown in FIG. 1(c), the outer edge of the cutout portion (second region B) is substantially rectangular in plan view of the first glass plate 11, and one side of the substantially rectangular shape is adjacent to (common with) a part of the outer edge of the first glass plate 11.

[0033] The second glass plate 17 in the vehicle laminated glass 10 may have substantially the same shape as the first glass plate 11 in a plan view of the first glass plate 11, including the cutout portion and / or the hollowed-out portion. Hereinafter, among the end faces of the interlayer film 12 and the second glass plate 17 in the vehicle laminated glass 10, an end face that is common to the outer edge of the second region B in a plan view of the first glass plate 11 is also referred to as an "inner end face". Moreover, among the end faces of the interlayer film 12 and the second glass plate 17, an end face other than the inner end face is also referred to as an "outer end face".

[0034] In addition, the strength of the boundary between the first region A and the second region B of the laminated glass for vehicles 10 is higher when the second region B is a hollowed-out portion than when the second region B is a cut-out portion. This is because when the second region B is a hollowed-out portion, the entire region outside the hollowed-out portion is the first region A, making it easier to disperse the impact in the ball drop test.

[0035] When the second region B is a hollow portion, the distance from the edge of the first glass plate 11 to the hollow portion (second region B) in a plan view of the first glass plate 11 may be 10 mm or more, preferably 30 mm or more, and more preferably 50 mm or more. On the other hand, if the distance from the first glass plate 11 to the hollow portion (second region B) is too long, the field of view may be narrowed, so the distance from the edge of the first glass plate 11 to the hollow portion (second region B) may be 200 mm or less.

[0036] From the viewpoint of ease of handling, the thickness of the second glass plate 17 is preferably 0.3 mm or more, more preferably 0.5 mm or more, and even more preferably 1.0 mm or more. From the viewpoint of light weight, the thickness is preferably 2.3 mm or less, and more preferably 2.0 mm or less. The composition and thickness of the first glass plate 11 and the second glass plate 17 may be the same or different.

[0037] The first glass sheet 11 and the second glass sheet 17 are formed into a plate shape by, for example, a float method, and then bent at high temperature by gravity forming or press forming. The first glass sheet 11 and the second glass sheet 17 may be either unstrengthened glass or strengthened glass. The strengthened glass may be either physically strengthened glass or chemically strengthened glass.

[0038] The compositions of the first glass plate 11 and the second glass plate 17 in this embodiment are not particularly limited. For example, the compositions may be expressed as the mole percentages of the oxides of the respective components, as follows: 50%≦SiO2≦80% 0.1%≦Al2O3≦25% 3%≦R2O≦30% (R2O represents the total amount of Li2O, Na2O, and K2O) 0%≦B2O3≦10% 0%≦MgO≦25% 0%≦CaO≦25% 0%≦SrO≦5% 0%≦BaO≦5% 0%≦ZrO2≦5% 0%≦SnO2≦5% Examples of the materials that satisfy the above conditions include:

[0039] Furthermore, a glass plate that can be used as a radio wave transparent member, which will be exemplified in the radio wave transparent member described later, may be used as the first glass plate 11 and / or the second glass plate 17.

[0040] The interlayer film 12 bonds the first glass plate 11 and the second glass plate 17. The interlayer film 12 needs to be in contact with at least a portion of the second main surface 11b of the first glass plate 11 and the third main surface 17c of the second glass plate 17, and may be in contact with the entire surfaces.

[0041] The interlayer film 12 in this embodiment can be made of a material that is generally used in laminated glass, such as a thermoplastic resin, a thermosetting resin, or an ultraviolet-curable resin, and can be formed by solidifying these resins. Note that "solidifying" here includes hardening.

[0042] The intermediate film 12 can preferably use a resin containing at least one selected from the group consisting of vinyl polymers, ethylene-vinyl monomer copolymers, styrene copolymers, polyurethane resins, fluororesins, silicone resins, and acrylic resins.

[0043] The intermediate film 12 may be a resin that is liquid before heating. Typical examples of the thermoplastic resin include polyvinyl butyral, ethylene vinyl acetate, and cycloolefin polymer. Typical examples of the thermosetting resin include silicone-based resin and acrylic-based resin. The intermediate film 12 may be made of these resins alone or in combination.

[0044] Furthermore, an adhesive used in an adhesive layer, which will be described later, may be used as the interlayer 12. When an adhesive is used for the interlayer 12, there is no need to apply heat to bond the first glass plate 11 and the second glass plate 17, and therefore there is no risk of the above-mentioned cracking or warping occurring. The thickness of the interlayer 12 may be from 0.1 mm to 2 mm.

[0045] Next, the laminated glass for vehicles according to this embodiment will be further described with reference to Fig. 3 to Fig. 8. Fig. 3 to Fig. 8 are all cross-sectional views of the laminated glass for vehicles 10 in Fig. 2 taken along line YY, and show a cross section including the first region A and the second region B.

[0046] First, the configuration of the laminated glass for vehicles 10 will be described with reference to the cross-sectional view shown in Fig. 3. The laminated glass for vehicles 10 has a filling portion 13, and in this embodiment, the filling portion 13 is composed only of a radio wave transparent member 14 described later.

[0047] The structure of the filling portion 13 will be described below with reference to Fig. 3. In this embodiment, the filling portion 13 shown in Fig. 3 has a surface facing the second main surface 11b. The filling portion 13 is adjacent to each part of the second main surface 11b and the third main surface 17c, and is adjacent to each entire surface of the inner end surface 12i of the interlayer 12 and the inner end surface 17i of the second glass sheet 17. "Adjacent" differs from "adjacent" in that a gap may be included therebetween.

[0048] The filling portion 13 may be adjacent to a part or the entirety of the inner end surface 17i of the second glass plate 17. In this case, friction between the filling portion 13 and the second glass plate 17 is more likely to occur than when the filling portion 13 is not in contact with the inner end surface 17i of the second glass plate 17. Therefore, durability in a ball drop test at the boundary between the first region A and the second region B can be improved, and the strength of the vehicle laminated glass 10 can be improved. Furthermore, when the filling portion 13 has adhesiveness to the second glass plate 17, the strength at the boundary between the filling portion 13 and the inner end surface 17i of the second glass plate 17 can be further improved.

[0049] When the filling portion 13 is adjacent or adjacent to the entire inner end surface 17i of the second glass plate 17 and forms approximately the same plane as the fourth main surface 17d, no step is created between the second glass plate 17 and the filling portion 13, and the boundary between the different materials is not spatially noticeable, particularly from the inside of the vehicle, which is preferable.

[0050] The filling portion 13 is continuously disposed between the first glass plate 11 and the second glass plate 17 in the first region A from the second main surface 11b side of the second region B of the laminated glass for vehicles 10 so as to intersect with all of the boundaries between the first region A and the second region B. With such an arrangement, for example, in an impact resistance test of the laminated glass for vehicles 10, the filling portion 13 absorbs the impact of an external force applied from a steel ball to the first main surface 11a, and serves as a stopper that prevents the boundary between the inner end surface 17i of the second glass plate 17 and the filling portion 13 from shifting. Therefore, a decrease in strength at the boundary between the first region A and the second region B can be suppressed.

[0051] Furthermore, in a penetration resistance test, for example, the laminated glass 10 for vehicles according to this embodiment can prevent misalignment at the boundary between the inner end face 17i of the second glass plate 17 and the filling portion 13 from occurring simultaneously with misalignment at the boundary between the inner end face 12i of the interlayer 12 and the filling portion 13 between the second main surface 11b and the third main surface 17c. As a result, the laminated glass 10 for vehicles can suppress a decrease in strength at the boundary between the first region A and the second region B.

[0052] Next, in a plan view of the first glass plate 11, the distance between the boundary between the first region A and the second region B and the periphery of the filling portion 13 (radio wave transparent member 14) in the first region A is defined as the distance d13 (d14). If the distance d13 (d14) is short, when an external force is applied to the first main surface 11a, the member (radio wave transparent member 14) filled in the filling portion 13 may fall out of the laminated glass for vehicles 10, and the steel ball may penetrate through. Therefore, if the distance d13 is 0.1 mm or more, it is preferable to prevent the radio wave transparent member 14 from falling out and to suppress a decrease in strength at the boundary between different materials, and 1 mm or more is more preferable, and 5 mm or more is even more preferable.

[0053] On the other hand, if the distance d13 is 30 mm or less, it is preferable because the boundary between the inner end surface 12i of the intermediate film 12 and the filling portion 13 is easily concealed by the light-shielding portion described later, and a distance d13 of 15 mm or less is more preferable.

[0054] When a second second region B separated from the second region B exists, for example, a filling portion different from the filling portion 13 may be continuously disposed between the first glass plate 11 and the second glass plate 17 so as to cross all of the boundaries between the first region A and the second second region B in a plan view of the first glass plate 11. Alternatively, the filling portion 13 may be continuously disposed between the first glass plate 11 and the second glass plate 17 so as to cross all of the boundaries between the first region A and the second second region B. In this case, the number of boundaries between different members or the same members can be reduced.

[0055] In the laminated glass 10 for vehicles of the present embodiment, the filling portion 13 may overlap a part of the second region B in a plan view of the first glass plate 11, or may overlap the entire second region B. If the filling portion 13 overlaps the entire second region B in a plan view of the first glass plate 11, this is preferable because it reduces boundaries formed by different materials in the second region B and suppresses a decrease in strength.

[0056] Furthermore, in the second region B of the laminated glass 10 for vehicles of the present embodiment, for example, instead of the second glass plate 17 having the above-mentioned glass composition, a radio wave transparent member 14 having a higher transmittance for millimeter waves than the second glass plate 17 can be disposed. Therefore, the second region B can have a higher transmittance for millimeter waves than the first region A.

[0057] The radio wave transparent member 14 will be described below. The radio wave transparent member 14 is not particularly limited as long as it is made of a material that can increase the radio wave transmission of a predetermined millimeter wave of 60 GHz or more, but a material with a low dielectric constant, low tan δ (dielectric tangent; δ is a loss angle), and particularly low dielectric loss is preferably used. Examples of materials that constitute the radio wave transparent member 14 include glass and resin.

[0058] The resin is not particularly limited, but examples of the resin that can be used include ABS (acrylonitrile butadiene styrene), PVC (polyvinyl chloride), fluorine-based resin, PC (polycarbonate), COP (cycloolefin polymer), SPS (syndiotactic polystyrene resin), modified PPE (modified polyphenylene ether), urethane resin, polystyrene (PS), and polyethylene terephthalate (PET).

[0059] For example, alkali-free glass can be used as the glass material constituting the radio wave transparent member 14. Alkali-free glass is glass in which the total content of alkali components expressed as mole percentage based on oxide is 1.0% or less. In addition, glass in which the total content is 0.1% or less can also be preferably used as alkali-free glass. In addition, the content of other components is not particularly limited, but for example, the content of each component expressed as mole percentage based on oxide is 50%≦SiO2≦80% 0%≦Al2O3≦30% 0%≦B2O3≦25% 0%≦MgO≦25% 0%≦CaO≦25% 0%≦SrO≦25% 0%≦BaO≦25% 0%≦ZrO2≦5% 5%≦RO≦40% (RO represents the total amount of MgO, CaO, SrO, and BaO) It is preferable to satisfy the following: The radio wave transparent member 14 may be made of these glasses and resins either alone or in combination.

[0060] If the difference in linear expansion coefficient between the first glass plate 11 and the radio wave transparent member 14 is large, the vehicle laminated glass 10 may crack or warp, resulting in poor appearance, when the laminated glass 10 undergoes a heating step for bonding the first glass plate 11 and the second glass plate 17. Therefore, it is preferable that the difference between the linear expansion coefficient of the first glass plate 11 and the linear expansion coefficient of the radio wave transparent member 14 is as small as possible.

[0061] The difference in linear expansion coefficient between the first glass plate 11 and the radio wave transparent member 14 may be expressed as the difference between their average linear expansion coefficients in a predetermined temperature range. In addition, when the radio wave transparent member 14 is made of a resin material, the resin material has a lower glass transition point than the glass material, so that the predetermined difference in average linear expansion coefficient may be set in a temperature range below the glass transition point of the resin material. The difference in linear expansion coefficient between the first glass plate 11 and the resin material may be set at a predetermined temperature below the glass transition point of the resin material.

[0062] (First Modification) Fig. 4 is a cross-sectional view of a first modified example of the laminated glass for vehicles 10 (laminated glass for vehicles 10a), and shows a cross section at a position similar to YY in the laminated glass for vehicles 10 in Fig. 2. Note that in this modified example, differences from the laminated glass for vehicles according to the first embodiment will be described, and the description of the laminated glass for vehicles according to the first embodiment will be used for the rest.

[0063] The laminated glass 10a for vehicles according to the first modification is different from the first embodiment in that the filling portion 13 has an adhesive layer 15 in addition to the radio wave transparent member 14.

[0064] In the laminated glass 10a for vehicles in FIG. 4, the adhesive layer 15 is adjacent to the entire surface of the radio wave transparent member 14 facing the second main surface 11b and to at least a part of the second main surface 11b of the first glass plate 11.

[0065] The adhesive layer 15 may be adjacent to a part of the surface facing the second main surface 11b of the radio wave transparent member 14. Furthermore, the radio wave transparent member 14 and the adhesive layer 15 are each adjacent to a part of the inner end face 12i of the intermediate film 12, but may be adjacent to a part of the inner end face 12i of the intermediate film 12. In the first region A, the sum of the thickness of the radio wave transparent member 14 and the thickness of the adhesive layer 15 is equal to the thickness of the intermediate film 12.

[0066] In the laminated glass 10a for vehicles, the radio wave transparent member 14 and the adhesive layer 15 are continuously disposed from the second main surface 11b side of the second region B between the first glass plate 11 and the second glass plate 17 in the first region A so as to intersect with all of the boundaries between the first region A and the second region B. The radio wave transparent member 14 and the adhesive layer 15 overlap the entire second region B in a plan view of the first glass plate 11.

[0067] However, one of the radio wave transparent member 14 and the adhesive layer 15 may overlap the entire second region B in a plan view of the first glass plate 11, and may be continuously disposed from the second main surface 11b side of the second region B between the first glass plate 11 and the second glass plate 17 in the first region A so as to intersect with all of the boundaries between the first region A and the second region B. In this case, in the first region A, one of the thickness of the radio wave transparent member 14 and the thickness of the adhesive layer 15 coincides with the thickness of the interlayer film 12.

[0068] The adhesive layer 15 will be described in detail below. The adhesive layer 15 has the effect of firmly bonding the glass plate, the interlayer, the radio wave transparent member, and the like. In this modification, the adhesive layer 15 bonds the first glass plate 11 and the radio wave transparent member 14. Therefore, when an external force is applied to the first main surface 11a, the radio wave transparent member 14 can be prevented from falling off the vehicle laminated glass 10a and the steel ball can be prevented from penetrating through. In particular, the adhesive layer 15 is highly effective when the radio wave transparent member 14 has low adhesion to the first glass plate 11 or when the radio wave transparent member 14 has no adhesion.

[0069] Furthermore, by having the adhesive layer 15, the laminated glass for vehicles 10a can fix the positions of the members other than the interlayer 12 and the adhesive layer 15 before bonding the members together by heating. For example, by having the adhesive layer 15, it is possible to prevent the position of the radio wave transparent member 14 from shifting and to prevent unintended gaps from being generated between the inner end face 12i of the interlayer 12 and the radio wave transparent member 14 (boundary portion) or between the inner end face 17i of the second glass sheet 17 and the radio wave transparent member 14 (boundary portion). Therefore, it is possible to prevent the generation of air bubbles and a decrease in strength at these boundaries.

[0070] Furthermore, the vehicle laminated glass 10a may include an adhesive layer (not shown) for bonding the radio wave transparent member 14 and the second glass plate 17 in addition to the adhesive layer 15. In this case, the same type of adhesive as that used for the adhesive layer 15 for bonding the first glass plate 11 and the radio wave transparent member 14 described above may be used, or a different type of adhesive may be used. The type and characteristics can be appropriately determined according to the members to be bonded.

[0071] The adhesive layer 15 is obtained by curing a curable composition such as a photocurable resin composition, a thermosetting resin composition, or a photo- and thermosetting resin composition. The term "photocurable resin composition" refers to a resin composition that can be cured by exposure to light. The term "thermosetting resin composition" refers to a resin composition that can be cured by heating. The term "photo- and thermosetting resin composition" refers to a resin composition that can be cured by exposure to light and heating. "Exposure" refers to irradiation with light such as ultraviolet light.

[0072] The curable composition is preferably a photocurable resin composition because it can be cured at a low temperature and has a fast curing rate. Since the photocurable resin composition has fluidity before curing, it is easy for multiple members, such as the first glass plate 11 and the radio wave transparent member 14, to adhere to each other, and it is possible to prevent an increase in the haze ratio at the interface.

[0073] The adhesive layer 15 has a storage shear modulus of 5×10 at 25° C. and a frequency of 1 Hz. 2 ~1×10 7 The range of Pa is preferred, with 1×10 3 ~1×10 6 The Pa range is more preferred.

[0074] The storage shear modulus of the adhesive layer 15 is 5×10 2 If the storage shear modulus of the adhesive layer 15 is 5×10 Pa or more, the shape of the adhesive layer 15 is easily maintained. 2If the pressure is equal to or higher than Pa, the radio wave transparent member 14 can be sufficiently fixed to members such as a glass plate and an intermediate film when bonded via the adhesive layer 15, and the adhesive layer 15 is less likely to deform due to pressure during bonding, which is preferable.

[0075] On the other hand, the storage shear modulus of the adhesive layer 15 is 1×10 7 If the pressure is less than or equal to Pa, even if air bubbles are generated at the interface during lamination via the adhesive layer 15, the air bubbles disappear in a short time and are unlikely to remain, which is preferable.

[0076] The thickness of the adhesive layer 15 is preferably 0.01 mm or more and 1.5 mm or less. If the thickness of the adhesive layer 15 is 0.01 mm or more, the adhesive layer 15 effectively buffers shocks caused by external forces from the first main surface 11a, and the concentration of external forces at the boundary portion can be suppressed. Furthermore, even if foreign matter not exceeding the thickness of the adhesive layer 15 is mixed in during lamination via the adhesive layer 15, the thickness of the adhesive layer 15 does not change significantly.

[0077] If the thickness of the adhesive layer 15 is 0.1 mm or more, the adhesive layer 15 can more effectively buffer shocks and the like caused by external forces from the first main surface 11a, and can suppress concentration of external forces at the boundary portion. If the thickness of the adhesive layer 15 is 1.5 mm or less, the radio wave transparent member 14 can be easily attached via the adhesive layer 15, and the overall thickness of the vehicle laminated glass 10a does not become unnecessarily thick. If the thickness is 0.7 mm or less, this is preferable because it is possible to suppress radio wave transmission loss of millimeter waves due to the adhesive layer 15, and if the thickness is 0.7 mm or less, this is more preferable, and if the thickness is 0.2 mm or less, this is even more preferable.

[0078] The photocurable resin composition is preferably a solvent-free type in that heating to remove the solvent is not required. "Solvent-free type" means that the photocurable resin composition does not contain a solvent or the content of the solvent is 5 mass% or less of the total mass (100 mass%) of the photocurable resin composition. "Solvent" means a liquid (volatile diluent) having a boiling point of 150°C or less. The photocurable resin composition is most preferably solvent-free in that a drying step can be omitted and time and energy can be saved.

[0079] The curable composition typically contains a curable compound (A) having a curable group and a photopolymerization initiator (B). If necessary, a non-curable component other than the photopolymerization initiator (B) may be contained.

[0080] The non-curable components include a non-curable polymer (C), a chain transfer agent (D), and other additives. The curable compound (A) includes acrylic, silicone, urethane acrylate, and epoxy compounds. Among them, compounds having a storage shear modulus G' of 5×10 2 ~1×10 7 The curable compound (A) is preferably a silicone-based or urethane acrylate-based compound in that it is easy to adjust the Pa. Furthermore, the curable compound (A) is more preferably a urethane acrylate-based compound in that it is easy to adjust the gel fraction to 1 to 50%.

[0081] (Second Modification) Fig. 5 is a cross-sectional view of a second modified example of the laminated glass for vehicles 10 (laminated glass for vehicles 10b), and shows a cross section at the same position as YY in the laminated glass for vehicles 10 in Fig. 2. Note that, in this modified example, differences from the laminated glass for vehicles 10 according to the first embodiment will be described, and the description of the laminated glass for vehicles 10 according to the first embodiment will be used for the rest.

[0082] The laminated glass for vehicles 10b differs from the laminated glass for vehicles 10 in that the interlayer film 12 is continuously disposed so as to overlap the entire second region B in a plan view of the first glass sheet 11 and to cross the entire boundary between the first region A and the second region B. With this arrangement, the interlayer film 12 also serves as the stopper described above to prevent misalignment at the boundary. Therefore, a decrease in strength at the boundary between the first region A and the second region B can be suppressed.

[0083] In the laminated glass 10b for vehicles, the filling portion 13 is not adjacent to the second main surface 11b, and the entire surface facing the second main surface 11b is adjacent to the interlayer 12. Moreover, the filling portion 13 shown in FIG. 5 is adjacent to a part of the third main surface 17c in the first region A, and is adjacent to the entire inner end face 12i of the interlayer 12 at the boundary between the first region A and the second region B.

[0084] This makes it possible to prevent misalignment at the boundary between the inner end surface 12i of the interlayer 12 and the filling portion 13 when an external force is applied to the first main surface 11a. As a result, it is possible to further suppress a decrease in strength at the boundary between the first region A and the second region B. Note that the inner end surface 12i of the interlayer 12 may occur when the interlayer 12 and the filling portion 13 become familiar with each other due to the pressure bonding process of the laminated glass.

[0085] In a plan view of the first glass plate 11, in the portion of the first region A where the filling portion 13 and the interlayer film 12 overlap, if the thickness of at least one of the filling portion 13 and the interlayer film 12 is 0.05 mm or more, a decrease in strength at the boundary can be effectively suppressed. Furthermore, if the thickness is 0.1 mm or more, a decrease in strength can be further effectively suppressed.

[0086] The thickness of at least one of the filling portion 13 and the interlayer film 12 in the first region A is preferably 1.6 mm or less, since the weight of the filling portion 13 or the interlayer film 12 itself is reduced, thereby reducing the weight of the laminated glass for vehicles 10b. The thickness is more preferably 1 mm or less, further preferably 0.8 mm or less, and particularly preferably 0.4 mm or less.

[0087] (Third Modification) Fig. 6 is a cross-sectional view of a third modified example of the laminated glass for vehicles 10 (laminated glass for vehicles 10c), and shows a cross section at a position similar to YY in the laminated glass for vehicles 10 in Fig. 2. Note that in this modified example, differences from the laminated glass for vehicles 10b according to the second modified example of the first embodiment will be described, and the description of the laminated glass for vehicles 10b according to the second modified example of the first embodiment will be used for the rest.

[0088] The laminated glass 10c for vehicles is different in that the filling portion 13 is not adjacent to any of the second main surface 11b, the third main surface 17c, or the inner end face 17i of the second glass plate 17, and all surfaces facing the third main surface 17c are adjacent to the interlayer film 12. Moreover, the filling portion 13 is adjacent to a part of the inner end face 12i of the interlayer film 12 in the first region A.

[0089] (Fourth Modification) Fig. 7 is a cross-sectional view of a fourth modified example of the laminated glass for vehicles 10 (laminated glass for vehicles 10d), and shows a cross section at a position similar to YY in the laminated glass for vehicles 10 in Fig. 2. Note that in this modified example, differences from the laminated glass for vehicles 10a according to the first modified example of the first embodiment will be described, and the description of the laminated glass for vehicles 10a according to the first modified example of the first embodiment will be used for the rest.

[0090] The laminated glass for vehicles 10d differs from the laminated glass for vehicles 10a in that, in addition to the filling portion 13 including the adhesive layer 15, the interlayer film 12 is continuously disposed so as to overlap the entire second region B in a plan view of the first glass plate 11 and intersect with all of the boundaries between the first region A and the second region B. Thus, the filling portion 13 and the interlayer film 12 function as the above-mentioned stopper that prevents misalignment at the boundary between the first region A and the second region B.

[0091] The adhesive layer 15 is adjacent to the surface of the radio wave transparent member 14 facing the second main surface 11b, and bonds the interlayer 12 and the radio wave transparent member 14 together. In particular, even if the adhesion of the radio wave transparent member 14 to the interlayer 12 is weak or the radio wave transparent member 14 has no adhesion, the adhesive layer 15 more effectively prevents the radio wave transparent member 14 from falling off the vehicle laminated glass 10d and the steel ball from penetrating when an external force is applied to the first main surface 11a. In addition, poor adhesion between the interlayer 12 and the radio wave transparent member 14 is prevented, and the haze ratio is significantly improved.

[0092] In the first region A, the sum of the thickness of the radio wave transparent member 14 and the thickness of the adhesive layer 15 is thinner than the thickness of the portion of the intermediate film 12 that does not overlap with the filling portion 13. If the thickness of the radio wave transparent member 14 in the first region A is 0.05 mm or more, it is preferable in terms of maintaining the shape of the radio wave transparent member 14, and if it is 0.1 mm or more, it is more preferable in terms of sufficiently suppressing a decrease in strength at the boundary between the first region A and the second region B.

[0093] Moreover, the thickness of the radio wave transparent member 14 in the first region A is preferably 1.9 mm or less, more preferably 1 mm or less, further preferably 0.8 mm or less, and particularly preferably 0.4 mm or less.

[0094] (Fifth Modification) Fig. 8 is a cross-sectional view of a fifth modified example of the laminated glass for vehicles 10 (laminated glass for vehicles 10e), and shows a cross section at the same position as YY in the laminated glass for vehicles 10 in Fig. 2. Note that in this modified example, differences from the laminated glass for vehicles 10a according to the first modified example of the first embodiment will be described, and the description of the laminated glass for vehicles 10a according to the first modified example of the first embodiment will be used for the rest.

[0095] The laminated glass for vehicles 10e differs from the laminated glass for vehicles 10a in that the filling portion 13 further has a reinforcement auxiliary film 16. In FIG. 8, the reinforcement auxiliary film 16 is adjacent to a part of the second main surface 11b, a part of the inner end face 12i of the intermediate film 12, and the surface of the adhesive layer 15 on the second main surface 11b side. The reinforcement auxiliary film 16 is continuously arranged so as to overlap the entire second region B in a plan view of the first glass plate 11 and intersect with all of the boundaries between the first region A and the second region B. Furthermore, in the second region B, the first glass plate 11, the reinforcement auxiliary film 16, the adhesive layer 15, and the radio wave transparent member 14 are laminated in this order.

[0096] The reinforced auxiliary film 16 has a breaking strength higher than that of the intermediate film 12 and the radio wave transparent member 14, and can absorb the impact of an external force transmitted from the first main surface 11a and the radio wave transparent member 14 without tearing.

[0097] The reinforcing auxiliary film 16 is preferably made of, for example, polyester, and examples of the polyester include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, or blends of these polymers.

[0098] The breaking strength of the reinforced auxiliary film 16 is 200N / 25mm or more, 250N / 25mm or more, or 300N / 25mm or more when measured in accordance with JIS A5759.

[0099] In addition, for example, in a penetration resistance test, it is possible to prevent misalignment of the boundary between the inner end face 17i of the second glass plate 17 and the radio wave transparent member 14 from occurring in conjunction with misalignment at the boundary between the inner end face 12i of the intermediate film 12 and the reinforced auxiliary film 16 between the second main surface 11b and the third main surface 17c. As a result, the laminated glass 10e for vehicles can suppress a decrease in strength at the boundary between the first region A and the second region B.

[0100] The adhesive layer 15 may be adjacent to the entire surface of the reinforcing auxiliary film 16. The reinforcing auxiliary film 16 may also be of the same thickness as the intermediate film 12. In these cases, the thickness of the intermediate film 12 in the first region A and the thickness of the filling portion 13 (in the first region A) are approximately the same, so there is no need to stack or scrape off multiple intermediate films. In addition, this is preferable because it is easy to stack the glass plates and the intermediate film 12 and fill the filling portion 13, and fine alignment is not required. "Approximately the same thickness" means that a difference in thickness of up to 15% is acceptable.

[0101] The thickness of the reinforcing auxiliary film 16 may be 0.05 mm or more and 1 mm or less. If it is 0.05 mm or more, the shape of the reinforcing auxiliary film 16 can be maintained. If it is 0.1 mm or more, a decrease in strength can be effectively suppressed. If it is 1 mm or less, radio wave transmission loss due to the reinforcing auxiliary film 16 can be suppressed, and it is preferably 0.8 mm or less, and more preferably 0.4 mm or less.

[0102] Next, in a plan view of the first glass plate 11, a distance connecting an arbitrary point on the boundary between the first region A and the second region B and an arbitrary point on the periphery of the reinforcement auxiliary film 16 in the first region A is defined as a distance d16. If the distance d16 is short, when an external force is applied to the first main surface 11a, the radio wave transparent member 14 may fall off the vehicle laminated glass 10e and the steel ball may penetrate therethrough.

[0103] Therefore, the distance d16 is preferably 0.1 mm or more in order to prevent the radio wave transparent member 14 from falling off and to suppress a decrease in strength at the boundary between different materials. It is more preferably 1 mm or more, and even more preferably 5 mm or more. It is preferably 30 mm or less because the boundary between the inner end surface 12i of the intermediate film 12 and the reinforced auxiliary film 16 can be easily concealed by the light-shielding part described later, and is more preferably 15 mm or less.

[0104] Second embodiment A second embodiment of the laminated glass for vehicles according to the present invention (laminated glass for vehicles 20) will be described below in detail with reference to Fig. 9. The laminated glass for vehicles 20 will be described in particular with respect to the differences from the laminated glass for vehicles 10d according to the fourth modified example of the first embodiment, and the description of the laminated glass for vehicles 10d according to the fourth modified example of the first embodiment will be used for the rest.

[0105] The laminated glass for vehicles 20 is characterized in that the filling portion 23 is present only in the second region B. The presence of the filling portion 23 only in the second region B is preferable because it makes filling of the filling portion 23 easy and does not require fine alignment.

[0106] In the second region B of the laminated glass for vehicles 20, a first glass plate 21, an interlayer film 22, an adhesive layer 25, and a radio wave transparent member 24 are laminated in this order. The radio wave transparent member 24 may be adjacent to at least a part of the inner end surface 27i of the second glass plate. The thickness of the interlayer film 12 may be approximately the same in the first region A and the second region B. In this case, the laminated glass for vehicles 20 does not need to laminate or scrape off a plurality of interlayer films in order to intentionally provide a step in the thickness direction.

[0107] In addition, in the first region A of the laminated glass for vehicles 20, since there is no boundary between the interlayer film 22 and the radio wave transparent member 24, no displacement occurs at the boundary. Furthermore, the interlayer film 22 can absorb impact regardless of the position where an external force is applied to the first main surface 21a. As a result, a decrease in strength at the boundary between the first region A and the second region B can be suppressed.

[0108] In the laminated glass for vehicles 20, the adhesive layer 25 firmly bonds the interlayer 22 and the radio wave transparent member 24. Therefore, even if the radio wave transparent member 24 does not cross the boundary between the first region A and the second region B in a plan view of the first glass plate 21, it is possible to prevent the radio wave transparent member 24 from falling off and the steel ball from penetrating when an external force is applied to the first main surface 21a. This is particularly effective when the radio wave transparent member 24 has low adhesiveness or has no adhesiveness.

[0109] Third embodiment Hereinafter, a third embodiment of the laminated glass for vehicles according to the present invention (laminated glass for vehicles 30) will be described in detail with reference to Fig. 10. The laminated glass for vehicles 30 will be described in particular with respect to the differences from the laminated glass for vehicles 10 according to the first embodiment, and the description of the laminated glass for vehicles 10 according to the first embodiment will be used for the rest.

[0110] The laminated glass for vehicles 30 differs from the first embodiment in that the filling portion 33 is present only in the second region B (not in the first region A).

[0111] The filling portion 33 has a thickness (t) at least part of the boundary between the first region A and the second region B that is smaller than a thickness (t) at the geometric center of the second region B. c The geometric center of the second region B means the center of gravity when the second region B is regarded as a plane figure in a plan view of the first glass plate 31, without taking into consideration the volume or mass.

[0112] For example, the filling portion 33 is such that t>t c By satisfying the above, it becomes easier to ensure radio wave permeability and suppress the decrease in strength at the boundary. In addition, in the entire boundary portion between the first area A and the second area B, t>t c By satisfying the above condition, the decrease in strength at the boundary is further suppressed. In this case, the thickness of the filling portion 33 is preferably gradually decreased from the boundary between the first region A and the second region B to the geometric center of the second region B, which can prevent an increase in the haze ratio and distortion.

[0113] In particular, in the laminated glass for vehicles 30, the radio wave transparent member 34 contains a material that can be directly bonded to the second main surface 31b of the first glass plate 31 by heating and pressurization, and is adjacent to the second main surface 32b, the inner end face 32i of the interlayer 32, and the inner end face 37i of the second glass plate 37. In the second region B, the radio wave transparent member 34 is adjacent to the second main surface 11b, so that the radio wave transmission loss and the haze ratio generated at the interface can be further suppressed compared to a configuration in which the interlayer 12 is disposed in the second region B.

[0114] An example of the radio wave transparent member 34 that can be directly bonded to the first glass plate 31 by applying heat and pressure is a urethane resin. Hereinafter, a case where a layered urethane resin is used as the radio wave transparent member 34 will be described.

[0115] As long as the radio wave transparent member 34 is adjacent to the second main surface 32b, the inner end face 32i of the intermediate film 32, and the inner end face 37i of the second glass plate 37, in a plan view of the first glass plate 31, neither the filling portion 33 nor the intermediate film 32 need to be continuously arranged so as to cross all of the boundaries between the first region A and the second region B.

[0116] In the manufacture of the laminated glass for vehicles 30 of this embodiment, the joining of the radio wave transparent member 34 to the first glass plate 31 and the joining of the second glass plate 37 to the first glass plate 31 via the interlayer 32 can be performed simultaneously by a single heating and pressurizing process. In addition, since both the urethane resin and the interlayer have adhesive properties to each other, the radio wave transparent member 34 and the inner end surface 32i of the interlayer 32 are firmly joined together. Therefore, a decrease in strength at the boundary between the first region A and the second region B can be suppressed.

[0117] The urethane resin may be configured as a single layer, but in order to improve strength, it is preferable to use multiple layers laminated as the radio wave transparent member 34. When using a urethane resin as the radio wave transparent member 34, the number of layers of the urethane resin may be in the range of 1 to 5 layers from the viewpoints of strength and radio wave transparency. In particular, since the adhesion and strength between the first glass plate 31 and the urethane resin are improved by using multiple layers, the number of layers of the urethane resin is preferably in the range of 2 to 5 layers, more preferably in the range of 2 to 4 layers, and even more preferably 2 layers.

[0118] The thickness of the urethane resin may be sufficient so that it is adjacent to at least a part of the inner end surface 37i of the second glass plate 37 in the entire boundary portion between the first region A and the second region B. Specifically, the ratio of the thickness of the urethane resin layer adjacent to the inner end surface 37i of the second glass plate 37 to the thickness of the inner end surface 37i of the second glass plate 37 is preferably 0.3 or more, more preferably 0.5 or more, and even more preferably 0.6 or more, from the viewpoint of strength. Moreover, from the viewpoint of millimeter wave transmittance, it is preferably 1 or less, more preferably 0.95 or less, and even more preferably 0.9 or less.

[0119] The urethane resin layer preferably has a tear strength of 40 kN / m or more, more preferably 50 kN / m or more, from the viewpoint of strength, in the test method specified in ASTM standard D624, Die C. Also, the tensile strength of the urethane resin layer preferably has a tensile strength of 30 MPa or more, more preferably 40 MPa or more, in the test method specified in ASTM standard D412.

[0120] In addition, in the second region B of the laminated glass for vehicles 30, the smaller the haze ratio when measured by the test method specified in ASTM standard D1003, the smaller the proportion of signals that are scattered without being transmitted can be. Specifically, a haze ratio of 5% or less is preferable because good visibility can be ensured. Furthermore, a haze ratio of 1% or less is more preferable because signals can be transmitted and received accurately by an information device described later. Furthermore, a haze ratio of 0.6% or less is even more preferable because signals can be transmitted and received more accurately.

[0121] (Fourth embodiment) A fourth embodiment of the laminated glass for vehicles according to the present invention (laminated glass for vehicles 40) will be described below in detail with reference to Fig. 11. The laminated glass for vehicles 40 according to the fourth embodiment will be described in particular with respect to the differences from the laminated glass for vehicles 30 according to the third embodiment, and the description of the laminated glass for vehicles 30 according to the third embodiment will be used for the rest.

[0122] 11 differs in that the radio wave transparent member 44 further includes a resin layer 44b, which is different from the urethane resin layer 44a, on the surface of the urethane resin layer 44a opposite to the second main surface 41b side. The urethane resin layer 44a is the same as the layered urethane resin that can be used as the radio wave transparent member 34 in the laminated glass 30 for vehicles in FIG.

[0123] The resin layer 44b is made of a radio wave transparent material different from that of the urethane resin layer 44a. By using a material harder than urethane resin as the resin layer 44b, the urethane resin layer can be made less susceptible to damage. This can prevent signals from being scattered and reducing the transmittance. Examples of the resin layer 44b include, but are not limited to, polycarbonate resin and cycloolefin polymer (COP). The resin layer 44b is not limited to one layer, and may be multiple layers.

[0124] Hereinafter, with reference to Figs. 12 and 13, a case will be described in which, as the laminated glass for vehicles of the present invention, for example, the laminated glass for vehicles 10 of the first embodiment is installed in an automobile.

[0125] 12 is a conceptual diagram showing a state in which the laminated glass for vehicles 10 is attached to an opening 110 formed in the front of an automobile 100. A housing (case) 120 that houses an information device for ensuring the safe running of the vehicle is attached to a fourth main surface 17d of the laminated glass for vehicles 10.

[0126] An information device is a device that uses a camera, radar, etc. to prevent rear-end collisions with vehicles ahead, pedestrians, obstacles, etc., and to notify the driver of danger. For example, it is an information receiving device and / or information transmitting device, etc., and includes millimeter wave radar, stereo camera, infrared laser, etc., and transmits and receives signals. The "signal" in question is an electromagnetic wave including millimeter waves, visible light, infrared light, etc.

[0127] Fig. 13 is an enlarged view of the S portion in Fig. 12, and is a perspective view showing a portion where the housing 120 is attached to the vehicle laminated glass 10. The housing 120 stores, as information devices, for example, a millimeter wave radar 201 and a stereo camera 202. As shown in Fig. 13, the vehicle laminated glass 10 is used such that the second region B, which is an area with excellent radio wave permeability, is positioned around the information devices such as the millimeter wave radar 201 and the stereo camera 202.

[0128] Housing 120 containing the information device is usually attached on the outer side of the vehicle relative to rearview mirror 150, but may be attached to other parts. On the windshield, housing 120 may be attached to test area B, an area other than the area obtained by expanding test area B in the horizontal direction of the windshield, or test area I, an area other than the area obtained by expanding test area I in the horizontal direction of the windshield. On the rear windshield, housing 120 may be attached near the lower part of a high-mounted stop lamp, for example.

[0129] When communicating with the outside using a millimeter wave radar or the like installed inside a vehicle, the angle at which radio waves are incident on a window glass surface, such as the windshield, varies depending on the structure of the window glass, the position of the communication partner, the elevation angle of the millimeter wave radar's direction of travel, etc.

[0130] However, for a typical automobile, taking into consideration the inclination angle of the windshield with respect to the horizontal plane, the angle of incidence of the millimeter wave radar on the windshield surface is set to about 67.5° as a guideline. In other words, the radio wave transmittance T(F) of millimeter waves incident on the window glass surface at an incidence angle of 67.5° is important as an index of the millimeter wave transmittance of automobile window glass, and incidence angles around 67.5° are also useful in evaluating millimeter wave transmittance.

[0131] As for the laminated glass for vehicles 10 according to the embodiment of the present invention, if the transmittance T(F) of radio waves of frequency F(GHz) incident on the first main surface 11a in the second region B at an incident angle of 67.5° satisfies the following formula (1) in the range of 60 GHz≦F≦100 GHz, it has high transmittance even for radio waves in a frequency band of several tens of GHz to 100 GHz, which is preferable. Note that when the value of T(F) is 1, the transmittance is 100%. T(F)>-0.0061×F+0.9384 ···(1)

[0132] In order to further improve the radio wave transmittance, it is preferable that the laminated glass for vehicles 10 according to the embodiment of the present invention has a transmittance T(F) of a radio wave of a frequency F(GHz) incident on the first main surface 11a in the second region B at an incident angle of 67.5°, which satisfies the following formula (2) in the range of 60 GHz≦F≦100 GHz. T(F)>-0.0061×F+1.0384 ···(2)

[0133] The laminated glass for vehicles 10-40 according to the present invention may have a functional layer on the first glass sheet, the radio wave transparent member, the second glass sheet, the intermediate film, the adhesive layer, the reinforcement auxiliary film, etc., to the extent that the effect of the present invention is not impaired. For example, a coating layer that imparts a water repellent function, a hydrophilic function, an antifogging function, etc., or an infrared reflective film, etc. may be provided. Furthermore, the filling portion 13-43 may be configured to include other members in addition to the radio wave transparent members 14-44.

[0134] Examples of the other members include adhesives, paints, glass, conductors, light-emitting bodies, ultraviolet absorbers, etc. When the filling portions 13-43 contain other members, it is sufficient that the vehicle laminated glass 10-40 at least satisfies the predetermined impact resistance and penetration resistance in the above-mentioned drop ball test and does not impair the radio wave transmittance.

[0135] The position at which the functional layer is provided is not particularly limited, and the functional layer may be provided on the surface of the laminated glass for vehicles 10 to 40, or may be provided so as to be sandwiched between a plurality of interlayer films. The laminated glass for vehicles 10 to 40 according to the present invention may also include a light-shielding part arranged in a strip shape on a part or all of the peripheral edge for the purpose of concealing the boundary part between different materials, the attachment part to a frame or the like, wiring conductors, and the like.

[0136] As the light-shielding portion, for example, a black ceramic layer or the like may be provided on the first glass sheet or the second glass sheet, or a colored portion may be provided on the interlayer. The black ceramic layer can be provided on the second main surface and / or the fourth main surface. By providing it on the second main surface, it has excellent concealing properties when viewed from outside the vehicle. By providing it on the fourth main surface, it has excellent concealing properties when viewed from inside the vehicle. The colored portion is not limited to black, and various colors can be used as long as it can block visible light to an extent that it can be concealed, at least in the portion that needs to be concealed.

[0137] Although the laminated glasses 10 to 40 for vehicles according to the present invention have been described above using, for example, the case where they are used as a front windshield of a vehicle, they can also be used as a rear glass and a side glass. EXAMPLES

[0138] The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. <Example 1> The first and second glass plates were made of glass (300 mm x 300 mm, 2 mm thick) containing 69.7% SiO2, 0.9% Al2O3, 7% MgO, 9% CaO, 0.05% TiO2, 12.6% Na2O, 0.6% K2O, and 0.2% Fe2O3, expressed as mole percentages of each oxide of the components. A polyvinyl butyral (PVB) film (manufactured by Sekisui Chemical Co., Ltd., 300 mm x 300 mm, 0.76 mm, 0.38 mm thick) was used as the intermediate film, and a polyethylene terephthalate (PET) film (220 mm x 220 mm, 0.15 mm thick) was used as the radio wave transparent material. The second glass plate and the 0.38 mm thick interlayer were provided with a 200 mm x 200 mm hollow so that the distance from the end of the first glass to the second region B was 50 mm. The first glass plate, the 0.76 mm thick interlayer, the radio wave transmission member, the 0.38 mm thick interlayer, and the second glass plate were laminated in this order so that d13 (d14) was 10 mm, and the laminate was evacuated using a vacuum packaging machine, and then heated (120 ° C, 30 minutes) to be temporarily pressure-bonded. Furthermore, pressure bonding was performed using an autoclave (1 MPa, 130 ° C, 90 minutes), to obtain a laminated glass for vehicles of Example 1, which is the configuration of the third modified example of the first embodiment shown in FIG. 6.

[0139] <Example 2> Except for the use of only one intermediate film (thickness 0.76 mm), the first glass plate, the second glass plate, and the intermediate film were the same as those used in Example 1. As a radio wave transmitting member, a polycarbonate (PC) resin plate (manufactured by Zeon Corporation, 200 mm × 200 mm, thickness 2 mm, linear expansion coefficient at 100 °C 70 × 10 -6 ℃ -1) was used. A transparent adhesive (manufactured by Taica Corporation) was applied to one main surface of the radio wave transparent member by a roll process to a thickness of 0.5 mm to form an adhesive layer. Next, a first glass plate, an interlayer film, and a second glass plate were laminated in this order, and the radio wave transparent member with an adhesive layer was laminated in the hollowed-out portion of the second glass plate as in the second embodiment shown in FIG. 9. Then, temporary pressure bonding was performed using a vacuum packaging machine under the same conditions as in Example 1, and further pressure bonding was performed using an autoclave to obtain a laminated glass for vehicles of Example 2.

[0140] <Example 3> Only one intermediate film (thickness 0.76 mm) was used, and the center part was hollowed out so as to overlap with the hollowed-out part of the second glass plate. Except for this, the first glass plate, the second glass plate, and the intermediate film were the same as those used in Example 1. The radio wave transparent member was a two-layered urethane resin plate (200 mm × 200 mm, thickness 1.27 mm, linear expansion coefficient at 100°C 10 × 10 -5 ℃ -1 ) was used. The first glass plate, the interlayer film, the second glass plate, and the two-layered urethane resin plate were laminated as in the third embodiment shown in FIG. 10, and then provisional pressure bonding was performed using a vacuum packaging machine under the same conditions as in Example 1, and further pressure bonding was performed using an autoclave, to obtain a laminated glass for vehicles of Example 3. In the obtained laminated glass for vehicles of Example 3, t was about 2.5 mm in the entire boundary portion between the first region A and the second region B, and t>t c In addition, the ratio of the thickness of the urethane resin adjacent to the inner end surface 37i of the second glass plate 37 to the thickness of the inner end surface 37i of the second glass plate 37 was approximately 0.87.

[0141] <Example 4> The first glass plate, the second glass plate, and the intermediate film were the same as those used in Example 3. For the radio wave transparent member, the two-layered urethane resin plate used in Example 3 was used as the urethane resin, and the polycarbonate (PC) resin plate (manufactured by Zeon Corporation, 200 mm × 200 mm, thickness 2 mm, linear expansion coefficient at 100 °C 70 × 10) was used as the resin layer. -6 ℃-1 ) were used. The first glass plate, the interlayer film, the second glass plate, the urethane resin layer, and the resin layer (PC) were laminated as in the fourth embodiment shown in Fig. 11, and then provisional pressure bonding was performed using a vacuum packaging machine under the same conditions as in Example 1, and further pressure bonding was performed using an autoclave, thereby obtaining a laminated glass for vehicles of Example 4.

[0142] <Comparative Example 1> A laminated glass for vehicles of Comparative Example 1 was obtained using the same members and procedures as in Example 2, except that no transparent adhesive was used and no adhesive layer was provided.

[0143] <Comparative Example 2> The first and second glass plates were made of glass (300 mm x 300 mm, thickness 2 mm) that is conventionally used in laminated glass for automobiles, and the interlayer was made of a polyvinyl butyral (PVB) film (manufactured by Sekisui Chemical Co., Ltd., 300 mm x 300 mm, thickness 0.76 mm). The second glass plate and the interlayer were not provided with a hollowed-out portion or a cutout portion. The first glass plate, the interlayer, and the second glass plate were laminated in this order, and temporarily pressure-bonded using a vacuum packaging machine under the same conditions as in Example 1, and further pressure-bonded using an autoclave, to obtain a laminated glass for vehicles of Comparative Example 2.

[0144] [Haze ratio measurement] The haze ratio is determined as the percentage of transmitted light that is deflected by 2.5° or more from the incident light due to forward scattering among the transmitted light that is transmitted through the laminated glass to be measured in the sheet thickness direction. In the present invention, the haze ratio was determined using a commercially available haze meter according to the test method specified in ASTM standard D1003. The results are shown in Table 1.

[0145] [Dropping ball test] The laminated glass for vehicles of Examples 1 to 4 and Comparative Examples 1 and 2 were subjected to impact resistance tests and penetration resistance tests as specified in JIS Standard R3212:2015 (Testing method for automotive safety glass) to confirm whether they satisfied the required impact resistance and penetration resistance as specified in JIS Standard R3211:2015 (Automotive safety glass). Those that satisfied the required impact resistance and penetration resistance are indicated with (○) and those that did not are indicated with (×) in Table 1. Examples 1 to 4 and Comparative Example 2 satisfied the impact resistance and penetration resistance, and Comparative Example 1 did not satisfy the impact resistance and penetration resistance.

[0146] [Measurement of radio wave transmittance T(F)] For the laminated glass for vehicles of Examples 1 to 4 and Comparative Examples 1 to 2, the transmittance T (F) of radio waves of frequency F (GHz) incident at an incident angle of 67.5° was calculated by simulation within the range of 60 GHz≦F (GHz)≦100 GHz. In the simulation, for Examples 1 to 14 and Comparative Examples 1 to 2, the insertion loss (S21 parameter) derived based on the dielectric constant and dielectric loss tangent of each material used was converted to (millimeter wave) transmittance. For the laminated glass of Example 3 and Comparative Example 2, the radio wave transmittance of the prepared laminated glass was measured by the free space method. The radio wave transmittance was calculated from the results of measuring the radio wave transmission loss when the case where there is no radio wave transparent substrate at an opening of 100 mmΦ is set to 0 dB for radio waves of frequency 79 GHz. As a result, the radio wave transmittance of the laminated glass of Example 3 and Comparative Example 2 was equivalent to the simulation result.

[0147] The simulation results of Examples 1 to 4 and Comparative Example 2 are shown in Fig. 14. The dotted lines in Fig. 14 represent the following formulas (1) and (2). T(F)>-0.0061×F+0.9384 ···(1) T(F)>-0.0061×F+1.0384 ···(2) Although the simulation results of Comparative Example 1 are not shown, Comparative Example 1 was almost the same as Example 2, and satisfied the above formula (1) in the range of 60 GHz≦F(GHz)≦100 GHz.

[0148] The laminated glass of Comparative Example 2, in which the transmittance T(F) of radio waves of frequency F(GHz) incident at an incident angle of 67.5° does not satisfy formula (1) in the range of 60 GHz≦F(GHz)≦100 GHz, had poor radio wave transmittance. In Table 1, the presence of a frequency that does not satisfy formula (1) or formula (2) is indicated by (×). On the other hand, the laminated glasses of Examples 1 to 4, in which the transmittance T(F) of radio waves of frequency F(GHz) incident at 67.5° satisfies formula (1) and formula (2) in the range of 60 GHz≦F(GHz)≦100 GHz, had excellent radio wave transmittance. The satisfaction of formula (1) and formula (2) in the entire range of 60 GHz≦F(GHz)≦100 GHz was indicated by (○).

[0149] [Evaluation of radio wave transparency] Using the results of the radio wave transmittance measurements, a radio wave transmission loss greater than 3 dB at a frequency of 79 GHz was evaluated as poor (×), and a loss of 3 dB or less was evaluated as good (◯). The evaluation results are shown in Table 1.

[0150] [Table 1]

[0151] Examples 1 to 4 satisfied the configurations of the first to fourth embodiments of the present invention, respectively, and were therefore excellent in both radio wave transparency and strength.

[0152] On the other hand, Comparative Example 1 did not have an adhesive layer and did not satisfy the configuration of the second embodiment of the present invention, resulting in inferior strength. Moreover, in Comparative Example 2, no radio wave transparent member was provided and the configuration of none of the embodiments of the present invention was satisfied, resulting in poor radio wave transparency.

[0153] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. Furthermore, the components in the above-mentioned embodiments may be arbitrarily combined within the scope of the invention.

[0154] This application is based on a Japanese patent application (Patent Application No. 2019-230102) filed on December 20, 2020, the contents of which are incorporated by reference into this application. [Explanation of symbols]

[0155] 10, 10a, 10b, 10c, 10d, 10e, 20, 30, 40 Laminated glass for vehicles 11, 21, 31, 41 First glass plate 11a, 21a, 31a, 41a 1st main surface 11b, 21b, 31b, 41b 2nd main surface 12, 22, 32, 42 Interlayer 12i, 32i, 42i: Inner end surfaces of intermediate films 12, 32, 42 13, 23, 33, 43 Filling section 14, 24, 34, 44 Radio wave transparent material 44a Urethane resin layer 44b Resin layer 15, 25 Adhesive layer 16 Reinforced auxiliary membrane 17, 27, 37, 47 Second glass pane 17i, 27i, 37i, 47i Inner end faces of second glass plates 17, 27, 37, 47 17c, 27c, 37c, 47c 3rd main surface 17d, 27d, 37d, 47d 4th principal surface 18x Hollow section 18y Cutout 100 Automobiles 110 Opening 120 Housing 150 Rearview Mirror 201 Millimeter wave radar 202 Stereo Camera A. First Area B. Second Area

Claims

1. A laminated glass for vehicles in which a first glass plate and a second glass plate are joined together by an interlayer film, the first glass sheet has a first major surface and a second major surface; the second glass sheet has a third major surface and a fourth major surface; the second main surface and the third main surface are surfaces on the intermediate film side, In a plan view of the first glass plate, a first region including the second glass plate and a second region not including the second glass plate are provided, a filling portion that is continuously arranged between the first glass sheet and the second glass sheet in the first region from the second main surface side of the second region so as to intersect with all of the boundaries between the first region and the second region, The filling portion includes a radio wave transparent material, The second region has a higher transmittance for millimeter waves than the first region.

2. The laminated glass for a vehicle according to claim 1 , wherein the filling portion has a thickness of 0.05 mm or more in the first region.

3. 3. The laminated glass for a vehicle according to claim 1, wherein in a plan view of the first glass plate, a distance between a boundary between the first region and the second region and a periphery of the filling portion in the first region is 0.1 mm or more.

4. 4. The laminated glass for a vehicle according to claim 3, wherein in a plan view of the first glass plate, a distance between a boundary between the first region and the second region and a periphery of the filling portion in the first region is 1 mm or more.

5. The filling portion has an adhesive layer, The laminated glass for a vehicle according to claim 1 , wherein the adhesive layer is adjacent to at least a part of a surface of the radio wave transparent member that faces the second main surface.

6. The laminated glass for vehicles according to claim 5 , wherein the adhesive layer is adjacent to at least a portion of the second main surface.

7. The filling portion has a reinforcing auxiliary film, The reinforcement auxiliary film is continuously arranged so as to overlap the entire second region and intersect with all of the boundaries between the first region and the second region in a plan view of the first glass plate, The laminated glass for vehicles according to claim 5 , wherein in the second region, the first glass plate, the reinforcement auxiliary film, the adhesive layer, and the radio wave transparent member are laminated in this order.

8. The laminated glass for vehicles according to claim 5 , wherein the adhesive layer contains at least one of a photocurable resin composition, a thermosetting resin composition, or a photo- and thermosetting resin composition.

9. The adhesive layer has a storage shear modulus of 5×10 at 25° C. and a frequency of 1 Hz. ２ ~1×10 ７ The laminated glass for vehicles according to claim 5 , wherein the thickness of the laminated glass for vehicles is in the range of Pa.

10. The laminated glass for vehicles according to claim 1 , wherein the radio wave transparent member contains alkali-free glass or resin.

11. A laminated glass for vehicles in which a first glass plate and a second glass plate are joined together by an interlayer film, the first glass sheet has a first major surface and a second major surface; the second glass sheet has a third major surface and a fourth major surface; the second main surface and the third main surface are surfaces on the intermediate film side, In a plan view of the first glass plate, a first region including the second glass plate and a second region not including the second glass plate are provided, The second region has a filling portion only on the second main surface side, The filling portion includes a radio wave transparent material, the radio wave transparent member is adjacent to the second main surface, an inner end face of the interlayer film, and an inner end face of the second glass plate, and includes at least one urethane resin layer; The second region has a higher millimeter wave transmittance than the first region.

12. The laminated glass for a vehicle according to claim 11 , wherein the radio wave transparent member further comprises a resin layer different from the urethane resin layer on a surface of the urethane resin layer opposite to the second main surface.

13. 13. The laminated glass for a vehicle according to claim 11, wherein a ratio of a thickness of the urethane resin layer adjacent to the inner end surface of the second glass plate to a thickness of the inner end surface of the second glass plate is 0.3 or more.

14. The laminated glass for a vehicle according to claim 11 , wherein the urethane resin layer has a tensile strength of 30 MPa or more.

15. The filling portion has a thickness (t) at least part of the boundary between the first region and the second region that is smaller than a thickness (t) at the geometric center of the second region. ｃ 15. The laminated glass for vehicles according to claim 11, wherein the thickness of the laminated glass for vehicles is greater than 15 mm.

16. 16. The laminated glass for a vehicle according to claim 1, wherein in the second region, a transmittance T (F) of a radio wave having a frequency F (GHz) that is incident on the first main surface at an incident angle of 67.5° satisfies the following formula (1) in a range of 60 GHz≦F≦100 GHz: T(F)>-0.0061×F+0.9384...(1)

17. In a plan view of the first glass plate, the area of ​​the second region is 400 mm ２ More than 90,000 mm ２ The laminated glass for vehicles according to any one of claims 1 to 16, wherein:

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