Laminated glass for vehicles

Abstract

To avoid deterioration in strength of a vehicular laminated glass with a functional film.SOLUTION: A vehicular laminated glass includes a first glass plate 11, a second glass plate 12, an intermediate adhesive layer 13 disposed between the first and second glass plates 11 and 12, and a functional film 15 disposed in the interior of the intermediate adhesive layer 13. The first glass plate 11 includes a first major surface 21 on a side opposite to the intermediate adhesive layer 13, and a second major surface 22 opposed to the intermediate adhesive layer 13. The second glass plate 12 includes a third major surface 23 opposed to the intermediate adhesive layer 13, and a fourth major surface 24 on a side opposite to the intermediate adhesive layer 13. The fourth major surface 24 includes a protective film 31. At least a part of the protective film 31 is overlapped with the functional film 15 in a plane view of the fourth major surface 24. A distance between the functional film 15 and a circumferential edge is 0.6 mm or less.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] In recent years, development of dimming glass whose transmittance changes according to an applied voltage has been underway. Such dimming glass is expected to be used for window glass for vehicles and the like. For example, the dimming glass is expected to be implemented as an alternative function for a sun visor of a driver's seat, a curtain of a rear door glass, or a movable shade of a roof glass.

[0003] Patent Document 1 discloses a technique related to window glass capable of changing light transmission.

[0004] Laminated glass for vehicles includes two glass plates and an intermediate adhesive layer provided between the two glass plates. The dimming glass can be configured by providing a dimming film inside the intermediate adhesive layer of the laminated glass for vehicles.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Since a functional film such as a dimming film includes a base material, when the laminated glass for vehicles is viewed in a plan view, the impact resistance and penetration resistance of the laminated glass for vehicles are maintained in the region where the functional film exists. However, in the edge portion of the functional film or in the region where the functional film does not exist in a plan view, the strength (such as impact resistance and penetration resistance) of the laminated glass for vehicles may decrease.

[0007] In view of the above issues, the object of the present invention is to suppress the decrease in strength of laminated glass for vehicles equipped with a functional film. [Means for solving the problem]

[0008] A laminated glass for vehicles according to one aspect of the present invention has the following configuration.

[0009] [1] It comprises a first glass plate, a second glass plate, an intermediate adhesive layer provided between the first and second glass plates, and a functional film provided inside the intermediate adhesive layer. The first glass plate includes a first main surface opposite to the intermediate adhesive layer and a second main surface facing the intermediate adhesive layer. The second glass plate includes a third main surface facing the intermediate adhesive layer and a fourth main surface opposite to the intermediate adhesive layer, The fourth main surface has a protective film, The protective film, in a plan view of the fourth main surface, overlaps with the functional film in at least a portion thereof, or the distance from the periphery of the functional film is 0.6 mm or less. Laminated glass for vehicles.

[0010] [2] The protective film is a laminated glass for vehicles according to [1] above, wherein, in a plan view of the fourth main surface, at least a portion of it overlaps with the functional film.

[0011] [3] The protective film is a laminated glass for vehicles according to [1] or [2] above, wherein, in a plan view of the fourth main surface, the entire protective film overlaps with the functional film.

[0012] [4] The laminated glass for vehicles according to [1] or [2] above, wherein the protective film is provided so as to straddle the edge of the functional film in a plan view of the fourth main surface.

[0013] [5] The functional film has a first concave portion that is concave inward in a plan view, and the laminated glass for vehicles according to any one of [1] to [4] above.

[0014] [6] The maximum bending angle of the first concave portion is 90° or more, and the laminated glass for vehicles according to [5] above.

[0015] [7] The ratio of the dimension of the protective film in the direction parallel to the straight line connecting the starting point and the ending point where the first concave portion is formed at the periphery of the functional film to the dimension of the straight line is 0.2 or more, and the laminated glass for vehicles according to [5] or [6] above.

[0016] [8] The protective film is separated from the periphery of the first glass plate by 5 mm or more in the first concave portion, and the laminated glass for vehicles according to any one of [5] to [7] above.

[0017] [9] At least one of the first glass plate and the second glass plate has a second concave portion that is concave inward in a plan view, and the laminated glass for vehicles according to any one of [1] to [8] above.

[0018]

[10] The total thickness of the protective film is 0.06 mm or more and 3.00 mm or less, and the laminated glass for vehicles according to any one of [1] to [9] above.

[0019]

[11] The 90° peel adhesion strength of the protective film measured under the condition that the tensile speed is 300 mm / min at room temperature is 15 (N / 25 mm) or more, and the laminated glass for vehicles according to any one of [1] to

[10] above. <^

[0020]

[12] The total thickness at the thinnest part of the intermediate adhesive layer is 1.10 mm or less, and the laminated glass for vehicles according to any one of [1] to

[11] above.

[0021]

[13] In a plan view, it has a light-shielding region and a non-light-shielding region inside the light-shielding region. The laminated glass for vehicle according to any one of [1] to

[12] above, wherein the protective film overlaps with the light-shielding region.

[0022]

[14] The laminated glass for vehicle according to

[13] above, wherein the protective film overlaps with the non-light-shielding region.

[0023]

[15] The laminated glass for vehicle according to

[13] above, wherein the protective film overlaps only with the light-shielding region among the light-shielding region and the non-light-shielding region.

[0024]

[16] The laminated glass for vehicle according to any one of [1] to

[15] above, wherein the periphery of the functional film is located 10 mm or more inside the periphery of at least one of the first glass plate and the second glass plate.

[0025]

[17] The laminated glass for vehicle according to any one of [1] to

[16] above, wherein the intermediate adhesive layer contains at least one resin selected from the group consisting of a plasticized polyvinyl chloride resin, a saturated polyester resin, a plasticized saturated polyester resin, a polyurethane resin, a plasticized polyurethane resin, an ethylene-vinyl acetate copolymer resin, an ethylene-ethyl acrylate copolymer resin, a cycloolefin polymer resin, an ionomer resin, an acrylic resin, an epoxy resin, and a silicone resin.

[0026]

[18] The laminated glass for vehicle according to any one of [1] to

[17] above, wherein the functional film contains at least one selected from the group consisting of a suspended particle device, a polymer dispersed liquid crystal, a polymer network liquid crystal, a guest-host liquid crystal, a photochromic device, an electrochromic device, and an electrokinetic device.

Advantages of the Invention

[0027] The present invention makes it possible to suppress the decrease in strength of laminated glass for vehicles equipped with a functional film. [Brief explanation of the drawing]

[0028] [Figure 1] This is a cross-sectional view showing an example of the configuration of laminated glass for vehicles according to an embodiment. [Figure 2] This is a cross-sectional view showing an example of the configuration of laminated glass for vehicles according to an embodiment. [Figure 3] This is a cross-sectional view showing an example of the configuration of laminated glass for vehicles according to an embodiment. [Figure 4] This is a cross-sectional view showing an example of the configuration of laminated glass for vehicles according to an embodiment. [Figure 5] This is a cross-sectional view showing an example of the configuration of laminated glass for vehicles according to an embodiment. [Figure 6] This is a plan view of laminated glass for a vehicle according to an embodiment. [Figure 7] This is an enlarged plan view of the dashed line portion in Figure 6. [Figure 8] This is an enlarged plan view of the dashed line portion in Figure 6. [Figure 9] This is a diagram illustrating the maximum curvature angle of the concave section. [Figure 10] This is a plan view of the laminated glass for vehicles according to the embodiment. [Figure 11] This is a cross-sectional view illustrating a test method for laminated glass used in vehicles. [Modes for carrying out the invention]

[0029] Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a cross-sectional view showing an example of the configuration of laminated glass for vehicles according to this embodiment. As shown in Figure 1, the laminated glass for vehicles 1 according to this embodiment has a first glass plate 11, a second glass plate 12, intermediate adhesive layers 13_1 and 13_2 provided between the first and second glass plates 11 and 12, and a functional film 15 provided inside the intermediate adhesive layers 13_1 and 13_2.

[0030] The laminated glass 1 for vehicles according to this embodiment can be used, for example, as a vehicle window. Vehicle windows include, for example, roof glass, windshields, rear windows, and fitted windows. The laminated glass 1 for vehicles is particularly suitable for use as roof glass in vehicles. In the following, "laminated glass for vehicles" will also be simply referred to as "laminated glass." In the following, the intermediate adhesive layers 13_1 and 13_2 will be collectively referred to as the intermediate adhesive layer 13.

[0031] The laminated glass 1 according to this embodiment may be flat or curved. It may also be a shape that includes both a flat and a curved surface. The first glass plate 11 and the second glass plate 12 may each be flat or curved, but it is preferable that at least one is curved to ensure the strength of the laminated glass for vehicles, and it is even more preferable that both are curved. The curved plate may be a simple curved shape curved in one direction, or a three-dimensional shape curved in two or more directions. The three-dimensional shape may be, for example, a double curved shape curved in two orthogonal directions. In the following example, the case in which both the first glass plate 11 and the second glass plate 12 are made of flat plates will be described, but the same description can be applied when at least one is made of a curved plate.

[0032] The outer edge shapes of the first glass plate 11 and the second glass plate 12 in plan view can be any shape, but rectangular, trapezoidal, and triangular shapes are preferred. The outer edge shapes of the first glass plate 11 and the second glass plate 12 in plan view may include recesses, which will be described later.

[0033] The first glass plate 11 includes a first main surface 21 opposite to the intermediate adhesive layer 13 and a second main surface 22 facing the intermediate adhesive layer 13. The second glass plate 12 includes a third main surface 23 facing the intermediate adhesive layer 13 and a fourth main surface 24 opposite to the intermediate adhesive layer 13. For example, the first main surface 21 of the first glass plate 11 is located on the outside of the vehicle, and the fourth main surface 24 of the second glass plate 12 is located on the inside of the vehicle.

[0034] The first and second glass plates 11 and 12 can be made of, for example, transparent inorganic glass. For the first and second glass plates 11 and 12, for example, soda-lime glass, aluminosilicate glass, borosilicate glass, alkali-free glass, quartz glass, etc. may be used. Alternatively, the first and second glass plates 11 and 12 may be made of organic glass (resin). For example, the organic glass may be polycarbonate resin, polystyrene resin, aromatic polyester resin, acrylic resin, polyester resin, polyarylate resin, polycondensate of halogenated bisphenol A and ethylene glycol, acrylic urethane resin, halogenated aryl group-containing acrylic resin, etc.

[0035] The thickness of each of the first and second glass plates 11 and 12 is, for example, 0.1 mm to 10 mm, preferably 0.3 mm to 3.0 mm, more preferably 1.1 mm to 2.6 mm, and even more preferably 1.7 mm to 2.1 mm from the viewpoint of resistance to flying stone impact. The thicknesses of the first and second glass plates 11 and 12 may be the same or different. For example, the thickness of the first glass plate 11, which is placed on the outside of the vehicle, may be thicker than the thickness of the second glass plate 12, which is placed on the inside of the vehicle. When the thickness of the first glass plate 11, which is placed on the outside of the vehicle, is increased, the strength of the laminated glass 1 against objects flying towards it is improved.

[0036] The intermediate adhesive layers 13_1 and 13_2 are positioned so as to be sandwiched between the first glass plate 11 and the second glass plate 12. In other words, the first glass plate 11 and the second glass plate 12 are bonded together using the intermediate adhesive layers 13_1 and 13_2. Specifically, when forming laminated glass 1, the first glass plate 11, intermediate adhesive layer 13_1, functional film 15, intermediate adhesive layer 13_2, and second glass plate 12 are stacked in that order, and the laminated body is heated and pressurized to form the laminated glass 1. At this time, the intermediate adhesive layers 13_1 and 13_2 are heated and melted, so in the finished laminated glass 1, the intermediate adhesive layers 13_1 and 13_2 form a single layer. Alternatively, a frame-shaped intermediate adhesive layer (not shown) may be placed between the intermediate adhesive layer 13_1 and the intermediate adhesive layer 13_2 so as to surround the functional film 15. In that case, in laminated glass 1, the intermediate adhesive layers 13_1, 13_2 and the frame-shaped intermediate adhesive layer will be a single layer.

[0037] The intermediate adhesive layer 13_1 may be in direct contact with the second main surface 22 of the first glass plate 11. Alternatively, another component (such as a coating) may be provided between the second main surface 22 of the first glass plate 11 and the intermediate adhesive layer 13_1. Similarly, the intermediate adhesive layer 13_2 may be in direct contact with the third main surface 23 of the second glass plate 12. Alternatively, another component (such as a coating) may be provided between the third main surface 23 of the second glass plate 12 and the intermediate adhesive layer 13_2.

[0038] For example, the total thickness of the intermediate adhesive layer 13 at its thinnest point, that is, the total thickness of the intermediate adhesive layer 13 at the point where it overlaps with the functional film 15, is not particularly limited, but is preferably 1.10 mm or less. Furthermore, the thickness of the intermediate adhesive layer 13 at its thinnest point is preferably 0.50 mm or more, preferably exceeding 0.76 mm, and more preferably 0.80 mm or more. Here, the total thickness of the intermediate adhesive layer 13 at its thinnest point is the sum of the thickness t1 of the intermediate adhesive layer 13_1 at the point where it overlaps with the functional film 15, as shown in Figure 1, and the thickness t2 of the intermediate adhesive layer 13_2 at the point where it overlaps with the functional film 15. By setting the total thickness of the intermediate adhesive layer 13 at its thinnest point within this range, the transparency of the laminated glass can be ensured, and the weight of the laminated glass can be prevented from becoming excessively large.

[0039] The thickness of the intermediate adhesive layer 13 is preferably 3.00 mm or less at its thickest point, but may also be 2.80 mm or less, 2.60 mm or less, 2.00 mm or less, 1.60 mm or less, or 1.30 mm or less. Here, the total thickness of the intermediate adhesive layer 13 at its thickest point is the sum of the thickness of the intermediate adhesive layer 13_1 at a position that does not overlap with the functional film 15 shown in Figure 1, and the thickness of the intermediate adhesive layer 13_2 at a position that does not overlap with the functional film 15. In other words, it is the distance between the first glass plate 11 and the second glass plate 12. Based on the above, the thickness of the intermediate adhesive layer 13 is preferably 0.50 mm or more and 3.00 mm or less.

[0040] The intermediate adhesive layer 13 may contain at least one resin selected from the group consisting of plasticized polyvinyl chloride resin, saturated polyester resin, plasticized saturated polyester resin, polyurethane resin, plasticized polyurethane resin, ethylene-vinyl acetate copolymer resin, ethylene-ethyl acrylate copolymer resin, cycloolefin polymer resin, ionomer resin, acrylic resin, epoxy resin, and silicone resin. Preferably, the intermediate adhesive layer 13 may contain at least one thermoplastic resin selected from the group consisting of plasticized polyvinyl chloride resin, saturated polyester resin, plasticized saturated polyester resin, polyurethane resin, plasticized polyurethane resin, ethylene-vinyl acetate copolymer resin, ethylene-ethyl acrylate copolymer resin, cycloolefin polymer resin, and ionomer resin. More preferably, the intermediate adhesive layer 13 may contain an ethylene-vinyl acetate copolymer resin.

[0041] The functional film 15 is provided inside the intermediate adhesive layers 13_1 and 13_2. As described above, when forming the laminated glass 1, the functional film 15 is placed between the intermediate adhesive layer 13_1 and the intermediate adhesive layer 13_2 and then heated and pressurized. As a result, the functional film 15 is placed inside the intermediate adhesive layers 13_1 and 13_2, which have melted and become a single layer.

[0042] In this embodiment, the periphery of the functional film 15 may be located at least 10 mm inward from the periphery of at least one of the first glass plate 11 and the second glass plate 12. That is, as shown in Figure 1, the distance d2 between the edge of the functional film 15 and the edges of the first and second glass plates 11 and 12 may be 10 mm or more. In this case, the distance d2 may be 12 mm or more, preferably 15 mm or more, and more preferably 20 mm or more. In this way, when the distance d2 is 10 mm or more, the functional film 15 can be separated from the edges of the first and second glass plates 11 and 12, thereby suppressing deterioration of the functional film 15 due to moisture entering from the edges of the first and second glass plates 11 and 12. There is no particular upper limit to the distance d2, but to make it easier to ensure the strength of the laminated glass, it is preferable to keep it within about 50 mm, for example.

[0043] The functional film 15 may include at least one selected from the group consisting of a suspended particle device (SPD), polymer dispersed liquid crystal (PDLC), polymer network liquid crystal (PNLC), guest-host liquid crystal (GHLC), photochromic device, electrochromic device, and electrokinetic device. If the functional film 15 is a light-adjusting film, the functional film 15 may include at least one selected from the group consisting of SPD, PDLC, PNLC, and GHLC.

[0044] An SPD is a component having an active layer containing suspended particles. For example, the active layer is sandwiched between transparent substrates on which transparent electrodes are formed, and the overall structure is film-like. The light absorption by the active layer is variable by applying a voltage to the electrodes. This light absorption is based on the arrangement of particles in the suspension droplets dispersed in the active layer. The degree of light absorption can be expressed, for example, by visible light transmittance. SPDs are known, for example, by International Publication No. 2005 / 102688 and International Publication No. 2012 / 009399.

[0045] A PDLC is a component having an active layer in which liquid crystal droplets are dispersed and held within a polymer matrix. For example, the active layer is sandwiched between transparent substrates on which transparent electrodes are formed, and the overall structure is film-like. The scattering of light by the active layer is variable by applying a voltage to the electrodes. This scattering of light is based on the arrangement of the liquid crystal droplets. The degree of light scattering can be expressed, for example, in haze. PDLCs are known, for example, in Japanese Patent Application Publication No. 07-239465 and U.S. Patent No. 4,688,900. PNLCs, on the other hand, have a low resin component ratio, and the liquid crystal material is arranged along a three-dimensional mesh-like polymer network structure. PNLCs are known, for example, in U.S. Patent No. 5,304,323.

[0046] GHLC is a component having an active layer formed by mixing a dichroic dye (guest), which has anisotropy in light absorption in the long axis and short axis directions of the molecule, with a liquid crystal material (host). For example, the active layer is sandwiched between transparent substrates on which transparent electrodes are formed, and the overall structure is film-like. The light absorption by the active layer is variable by applying a voltage to the electrodes. This light absorption is based on the orientation state of the liquid crystal material and dichroic dye contained in the active layer. GHLC is known, for example, by Japanese Patent No. 5729092.

[0047] The thickness of the functional film 15 is, for example, 0.1 mm or more and 0.5 mm or less, and preferably 0.1 mm or more and 0.4 mm or less.

[0048] The protective film 31 is provided on the fourth main surface 24 of the second glass plate 12. The protective film 31 is provided such that, in a plan view of the fourth main surface 24, at least a portion of it overlaps with the functional film 15.

[0049] For example, as shown in Figure 1, the protective film 31 may be provided so as to straddle the edge of the functional film 15. By providing the protective film 31, the reduction in strength of the laminated glass 1 can be effectively suppressed in the edge portion of the functional film 15 and in areas where the functional film 15 is not present in a plan view. For example, the dimension d1 of the overlapping portion 32 of the protective film 31 and the functional film 15 is 1 mm or more, preferably 3 mm or more, and more preferably 5 mm or more.

[0050] Furthermore, the protective film 31 may be provided so as not to straddle the edge of the functional film 15, that is, spaced apart. In this case, the distance between the protective film 31 and the periphery of the functional film 15 in a plan view of the fourth main surface 24 is greater than 0 mm. The protective film 31 may be provided so that the distance between the protective film 31 and the periphery of the functional film 15 in a plan view of the fourth main surface 24 is 0.6 mm or less, preferably 0.5 mm or less, more preferably 0.4 mm or less, and even more preferably 0.3 mm or less. Specifically, as shown in Figure 2, the protective film 31 may be provided so that the distance d3 between the inner edge of the protective film 31 and the periphery of the functional film 15 is 0.6 mm or less. In this case as well, by providing the protective film 31, the reduction in strength of the laminated glass 1a can be effectively suppressed in the edge portion of the functional film 15 and in areas where the functional film 15 is not present in a plan view.

[0051] Furthermore, the protective film 31 may be provided so that it completely overlaps with the functional film 15 in a plan view of the fourth main surface 24. Specifically, as shown in Figure 3 for the laminated glass 1b, the protective film 31 may be provided so that it completely overlaps with the functional film 15. In this case as well, by providing the protective film 31, the reduction in strength of the laminated glass 1b can be effectively suppressed in the edge portions of the functional film 15 and in areas where the functional film 15 is not present in a plan view. In Figure 3, as an example, a configuration is shown in which the periphery of the functional film 15 and the edge of the protective film 31 coincide in a plan view. However, the protective film 31 may be positioned inside the periphery of the functional film 15 in a plan view of the fourth main surface 24, and it is preferable that the distance between the periphery of the functional film 15 and the edge (outer edge) of the protective film 31 be within 10 mm.

[0052] The protective film 31 can be composed of a component comprising a base material and an adhesive layer. The base material can be, for example, polyurethane, ionomer, thermoplastic polyurethane (TPU), or polycarbonate (PC). The adhesive layer can be, for example, an acrylic material.

[0053] The thickness of the base material is, for example, 0.05 mm to 2.00 mm. Preferably, the base material thickness is 0.10 mm or more, and more preferably 0.15 mm or more. Furthermore, preferably, the base material thickness is 1.00 mm or less, and more preferably 0.50 mm or less. The thickness of the adhesive layer is, for example, 0.01 mm to 1.00 mm. Preferably, the adhesive layer thickness is 0.02 mm or more, and more preferably 0.05 mm or more. Furthermore, preferably, the adhesive layer thickness is 0.80 mm or less, and more preferably 0.50 mm or less. The total thickness of the protective film 31 (thickness including the base material and adhesive layer) is, for example, 0.06 mm to 3.00 mm. If the total thickness of the protective film 31 is 0.06 mm or more, the strength of the laminated glass can be effectively improved. Also, if the total thickness of the protective film 31 is 3.00 mm, the step created by the protective film 31 will not become too large, making it easier to suppress peeling due to snagging. The total thickness of the protective film 31 is preferably 0.10 mm or more, and more preferably 0.20 mm or more. Furthermore, the total thickness of the protective film 31 is preferably 2.00 mm or less, and more preferably 1.00 mm or less.

[0054] Furthermore, the 90° peel adhesion strength of the protective film 31, that is, the 90° peel adhesion strength of the protective film 31 measured at room temperature under the condition of a tensile speed of 300 mm / min, is preferably 15 (N / 25 mm) or higher. The room temperature is set to 23°C, a general soda-lime glass is used as the test plate to which the protective film is attached, and other conditions may conform to JIS K 6854-1 of 1999. The 90° peel adhesion strength of the protective film 31 is more preferably 18 (N / 25 mm) or higher, and even more preferably 20 (N / 25 mm) or higher. The upper limit of the 90° peel adhesion strength of the protective film 31 is, for example, 100 (N / 25 mm).

[0055] Furthermore, the maximum tensile force of the protective film 31 at a temperature of 23°C, a tensile speed of 1000 mm / min, and using a No. 5 dumbbell shape is preferably 20 N or more, more preferably 25 N or more, and even more preferably 30 N or more. Other conditions may conform to JIS K 6251 2017. The upper limit of the maximum tensile force of the protective film 31 is, for example, 50 N.

[0056] As described above, the laminated glass 1, 1a, and 1b according to this embodiment have a protective film 31 on the fourth main surface 24 of the second glass plate 12. The protective film 31 is positioned such that, in a plan view of the fourth main surface 24, at least a portion of it overlaps with the functional film 15, or the distance between the protective film 31 and the periphery of the functional film 15 is within 0.6 mm. Therefore, a decrease in the strength (impact resistance, penetration resistance, etc.) of the laminated glass 1, 1a, and 1b can be suppressed in the edge portions of the functional film 15 and in areas where the functional film 15 is not present in a plan view.

[0057] Figure 4 is a cross-sectional view showing an example of the configuration of laminated glass according to this embodiment, and also shows other examples of the configuration of laminated glass. As shown in Figure 4, the laminated glass 1c may include a light-shielding region 16. That is, in a plan view of the fourth main surface 24, the laminated glass 1c may include a light-shielding region 16 and a non-light-shielding region 17 inside the light-shielding region 16. In this case, the protective film 31 may be provided so as to overlap with the light-shielding region 16. When a light-shielding region 16 is provided, irradiation of the protective film 31 with ultraviolet rays, etc., can be suppressed, so the strength of the laminated glass 1c can be maintained for a long period of time.

[0058] In the configuration example shown in Figure 4, the protective film 31 overlaps only with the light-shielding region 16 of the two light-shielding regions 17. In this case, since the protective film 31 does not overlap with the non-light-shielding region 17, the occurrence of distortion in the non-light-shielding region (transmitting region) 17 can be suppressed. Therefore, the transmittance of the non-light-shielding region (transmitting region) 17 can be set to the desired transmittance.

[0059] Furthermore, in this embodiment, as shown in Figure 5, the protective film 31 may overlap the light-shielding region 16 and the non-light-shielding region 17, as shown in the laminated glass 1d. The width d4 where the protective film 31 and the non-light-shielding region 17 overlap is 5 mm or less, preferably 3 mm or less. By covering the boundary between the light-shielding region 16 and the non-light-shielding region 17 with the protective film 31 in this way, the reduction in strength at the boundary between the light-shielding region 16 and the non-light-shielding region 17 can be suppressed.

[0060] The light-shielding region 16 may be formed, for example, by printing a black ceramic film onto the fourth main surface 24 of the second glass plate 12. Specifically, the light-shielding region 16 may be formed by applying a ceramic color paste containing a molten glass frit containing a black pigment and firing it.

[0061] Furthermore, even when a light-shielding region 16 is provided, the protective film 31 may be provided such that the distance d3 between the protective film 31 and the periphery of the functional film 15 is 0.6 mm or less, as shown in Figure 2. Alternatively, as shown in Figure 3, the protective film 31 may be provided such that its entirety overlaps with the functional film 15.

[0062] Figure 6 is a plan view of the laminated glass 1e according to this embodiment. As shown in Figure 6, in this embodiment, the functional film 15 may have a recess 18 that is recessed inward in a plan view. When the first and second glass plates 11 and 12 are curved, providing the recess 18 can suppress the formation of wrinkles in the film when the members are laminated and pressed together by heating and pressing.

[0063] A concave area is a region in a plan view where, when two different points on the periphery of an object are connected, the resulting line segment does not overlap with the object itself. For example, if an object has a concave polygonal shape in plan view, the portion forming a concave angle (an interior angle greater than 180° and less than 360°) is a concave area. The planar shape of a concave area is not particularly limited; it may be rectangular, trapezoidal, triangular, semicircular, or a combination of these. Furthermore, this planar shape does not need to consist solely of straight lines, vertices, and planes; it may include curves and curved surfaces.

[0064] Furthermore, as shown in Figure 6, the first glass plate 11 and the second glass plate 12 may have recesses 19 that are inwardly recessed when viewed from above. In this case, the recesses 19 may be provided in at least one of the first glass plate 11 and the second glass plate 12. Also, the recesses 18 of the functional film 15 and the recesses 19 of the first and second glass plates 11 and 12 may be arranged to overlap when viewed from above (i.e., the edges of their peripheral sides may be the same).

[0065] Figures 7 and 8 are enlarged plan views of the dashed line portion in Figure 6. As shown in Figures 7 and 8, in this embodiment, a protective film 31 is provided near the recess 18 of the functional film 15 so as to overlap with the functional film 15 in a plan view. Figure 7 shows an example in which a rectangular protective film 31 is provided. Figure 8 shows an example in which a protective film 31 has a shape that follows the recess 18. Since shear stress tends to concentrate in the recess 18, providing a protective film 31 near the recess 18 in this way can effectively suppress the reduction in the strength of the laminated glass.

[0066] For example, if L1 is the dimension of a straight line connecting the starting point P1 and ending point P2 that form a recess 18 at the periphery of the functional film 15, and L2 is the dimension of the protective film 31 in a direction parallel to this line, it is preferable to set the ratio of L2 to L1 (L2 / L1) to 0.2 or more. By setting the ratio of L2 to L1 (L2 / L1) to 0.2 or more, the reduction in the strength of the laminated glass in the recess 18 of the laminated glass can be effectively suppressed. A larger L2 / L1 is more effective, and it may be 0.4 or more, 0.6 or more, 0.8 or more, or 1.0 or more. L2 / L1 is not particularly limited as long as the protective film 31 does not protrude from the laminated glass, but keeping it at around 2.0 or less can suppress the reduction in the aesthetic appearance of the laminated glass due to the protective film 31.

[0067] The portion of the periphery of the object that forms the recess is a continuous line, in plan view, that includes at least some straight and curved lines. The starting point P1 and ending point P2 may be one and the other of the two endpoints of this continuous line, respectively.

[0068] Furthermore, it is preferable that the protective film 31 is spaced at least 5 mm away from the periphery of the first glass plate 11 (or the second glass plate 12) in the recess 18. In other words, it is preferable that the distance d5 between the periphery of the first glass plate 11 (or the second glass plate 12) and the protective film 31 in Figures 7 and 8 be 5 mm or more. With this configuration, when the laminated glass is bonded to the vehicle body using an adhesive such as urethane on the fourth main surface 24 of the second glass plate 12, contact between the adhesive and the protective film 31 can be suppressed, thus ensuring the adhesive strength of the urethane regardless of the type of protective film 31. Note that the above effect can be sufficiently obtained if the protective film 31 is spaced at least 8 mm away from the periphery of the first glass plate 11 (or the second glass plate 12) in the recess 18. The upper limit of the separation distance may be, for example, 50 mm, but is not limited to this, and should be within a range that does not impair the effect of the invention, taking into account the positional relationship with the functional film 15.

[0069] For example, the maximum curvature angle of the recess 18 of the functional film 15 is 90° or more. Alternatively, the maximum curvature angle of the recess 18 of the functional film 15 may be 100° or more, 130° or more, or 150° or more. The larger the maximum curvature angle of the recess 18, the greater the effect of suppressing the reduction in strength of the laminated glass due to the provision of the protective film 31. The upper limit of the maximum curvature angle is not particularly limited as long as it is less than 180°, but may be, for example, 170° or less, or 160° or less.

[0070] Here, the maximum curvature angle is defined by the angle α formed by the line segment connecting the starting point P1 and point P3 and the line segment connecting the ending point P2 and point P3, where P1 is the starting point, P2 is the ending point, and P3 is the point where the recess 18 is most recessed, as shown in Figure 9.

[0071] Point P3 is a point on the surface (edge ​​in a plan view) that constitutes the recess 18, and is the point furthest from the line segment connecting the starting point P1 and the ending point P2 in a direction perpendicular to that line segment. If there are multiple points P3 that satisfy this condition, the point P3 that has the smallest angle α between the line segment connecting the starting point P1 and point P3 and the line segment connecting the ending point P2 and point P3 may be considered the true point P3.

[0072] Furthermore, when using multiple protective films side by side in an area requiring protection, it is preferable that there are no gaps between the multiple protective films, more preferably that they overlap by 1 mm or more, even more preferably that they overlap by 3 mm or more, and most preferably that they overlap by 5 mm or more. [Examples]

[0073] Next, embodiments of the present invention will be described. As a sample for the embodiment, laminated glass 1f having the planar shape shown in Figure 10 and the cross-sectional shape shown in Figure 11 was fabricated.

[0074] For the outer plate of the sample (corresponding to the first glass plate 11), a float glass (double-curved shape) measuring 1500mm (width) x 1200mm (height) x 2mm (thickness) was used. For the intermediate adhesive layer 13, two sheets of EVA (Tosoh Corporation, Mersen G7055) measuring 1500mm x 1200mm x 0.4mm were used. For the functional film 15, a dimming film measuring 1200mm x 1100mm x 0.1mm was used. For the inner plate (corresponding to the second glass plate 12), a float glass (double-curved shape) measuring 1500mm x 1200mm x 2.1mm was used. The distance between the inflection points of the recess of the laminated glass 1f (corresponding to the distance between the start point P1 and the end point P2 in Figure 9) was set to 260mm. The maximum curvature angle α of the recess of the laminated glass 1f was set to 130°. A protective film 31 was provided on the fourth main surface 24 of the second glass plate 12 of each sample. Furthermore, two functional films 15 were used: a functional film 15a with recesses and a functional film 15b without recesses (see Figure 10). The details of each sample are described below.

[0075] In the sample for Example 1, the distance d2 (see Figure 1) from the edge of the laminated glass 1f to the edge of the functional film 15 was set to 40 mm. Also, in Example 1, a functional film 15b (see Figure 10) without recesses was used. Furthermore, a protective film A with a length of 100 mm, a width of 31.5 mm, and a thickness of 0.36 mm was used as the protective film 31. The overlap amount (d1: see Figure 1) between the functional film 15 and the protective film 31 was set to 5 mm. In this case, the non-overlap amount between the functional film 15 and the protective film 31 is 26.5 mm.

[0076] The base material of protective film A is polyurethane, and the adhesive layer is made of an acrylic material. The thickness of the base material is 0.31 mm, the thickness of the adhesive layer is 0.05 mm, and the total thickness of protective film A is 0.36 mm. The 90° peel adhesion strength of protective film A, that is, the 90° peel adhesion strength of protective film 31 measured at room temperature under the condition of a tensile speed of 300 mm / min, was 19 (N / 25 mm).

[0077] In the sample for Example 2, protective film A with a length of 100 mm, a width of 29.5 mm, and a thickness of 0.36 mm was used as the protective film 31. The overlap amount (d1: see Figure 1) between the functional film 15 and the protective film 31 was set to 3 mm. In this case, the non-overlap amount between the functional film 15 and the protective film 31 is 26.5 mm. Otherwise, it is the same as the sample for Example 1.

[0078] In the sample for Example 3, protective film A with a length of 100 mm, a width of 27.5 mm, and a thickness of 0.36 mm was used as the protective film 31. The overlap amount (d1: see Figure 1) between the functional film 15 and the protective film 31 was set to 1 mm. In this case, the non-overlap amount between the functional film 15 and the protective film 31 is 26.5 mm. Otherwise, it is the same as the sample for Example 1.

[0079] In the sample for Example 4, a functional film 15a (see Figure 10) with a recess was used. The maximum curvature angle α of the recess in the functional film 15a was set to 130°. The distance d2 (see Figure 11) from the edge of the laminated glass 1f to the edge of the functional film 15a was set to 15 mm. A protective film A with a length of 100 mm, a width of 10 mm, and a thickness of 0.36 mm was used as the protective film 31. The edge of protective film A facing the edge of the laminated glass 1f was located 26.5 mm inward from the edge of the laminated glass 1f in a plan view. In other words, the center position in the width direction of protective film A coincided with the landing position of the steel ball described later in a plan view. The coverage ratio of protective film 31 over the recess of the functional film 15a, i.e., L2 / L1 (see Figure 7) mentioned above, was 0.38. The overlap amount (dimension d1: see Figure 1) between the functional film 15a and protective film 31 was set to 10 mm. In other words, in this case, the entire protective film 31 overlaps with the functional film 15a.

[0080] In the sample for Example 5, protective film A with a length of 200 mm, a width of 10 mm, and a thickness of 0.36 mm was used as the protective film 31. The coverage ratio of the protective film 31 to the recesses of the functional film 15a, i.e., L2 / L1 (see Figure 8) as described above, was 0.77. Otherwise, it was the same as the sample for Example 4.

[0081] In the sample for Example 6, the maximum curvature angle α of the recess of the functional film 15a was set to 150°. Otherwise, it was the same as the sample for Example 4.

[0082] In the sample for Example 7, the maximum curvature angle α of the recess of the functional film 15a was set to 90°. Otherwise, it was the same as the sample for Example 4.

[0083] As a sample for Example 8, a sample was prepared in which the protective film 31 was not provided on the sample for Example 1.

[0084] As a sample for Example 9, a sample was prepared in which the protective film 31 was not provided on the sample for Example 5.

[0085] For the samples prepared as described above, Examples 1 to 9 were subjected to impact resistance tests as defined in JIS R 3212 2015 to check for penetration. Specifically, as shown in Figure 10, a square with sides of 300 mm was defined as the test area 40, and a steel ball 45 was dropped onto the drop point 41 within this test area 40. However, for this test only, the drop point 41 of the steel ball 45 was set to coincide with the distance d2 from the edge of the laminated glass 1f to the edge of the functional film 15 in Examples 1 to 3 and 8 (see Figure 1). In Examples 4 to 7 and 9, the drop point 41 of the steel ball 45 was set to a point 31.5 mm inward from the edge of the laminated glass 1f so that the dropped ball and the test frame would not overlap in a plan view (see Figure 11). The impact resistance test was performed with each sample fixed in a test frame 43. The height from which the ball was dropped was 9.14 m.

[0086] The impact resistance test evaluation was based on the following criteria. ◎: If the film fails to penetrate in all 10 impact resistance tests, and the protective film 31 is peeled off by less than 30mm. ○: If the film fails to penetrate in all 10 impact resistance tests, and the protective film 31 is peeled off by 30mm or more. △: In the case where the material does not penetrate 7 to 8 times out of 10 impact resistance tests. ×: If the number of times the impact resistance test fails to penetrate is less than 7 out of 10.

[0087] Table 1 shows the results of the impact resistance test.

[0088] [Table 1]

[0089] As shown in Table 1, in Examples 1 to 3, the impact resistance test evaluation was "◎" or "○", indicating good results. In particular, in Example 1, where the overlap amount between the functional film 15 and the protective film 31 was 5 mm, and in Example 2, where the overlap amount between the functional film 15 and the protective film 31 was 3 mm, the impact resistance test evaluation was "◎".

[0090] Furthermore, in Examples 4 to 7, the impact resistance test evaluation was "◎" in Examples 5 and 6, and "△" in Examples 4 and 7. Comparing Examples 4 and 5, Example 5, where the protective film has a higher coverage rate over the recesses of the functional film, received a "◎" evaluation in the impact resistance test. Comparing Examples 6 and 7, Example 7, where the maximum curvature angle α of the recess of the functional film 15 is 90°, received a "△" evaluation in the impact resistance test. Therefore, it can be said that a larger maximum curvature angle α of the recess results in a better evaluation in the impact resistance test.

[0091] Furthermore, considering the concentric deformation area when laminated glass breaks, the length of the protective film should preferably be longer than 100 mm, and more preferably 200 mm or longer.

[0092] Furthermore, in examples 8-9, where no protective film was applied, the impact resistance test result was "×".

[0093] In the impact resistance test described above, protective film A, as explained above, was used as protective film 31. Below, we present the results of our investigation into the use of other protective films B to E.

[0094] For protective film B, a protective film with an ionomer base material and an acrylic adhesive layer was used. The thickness of the base material of protective film B was 0.15 mm, the thickness of the adhesive layer was 0.2 mm, and the total thickness of protective film B was 0.35 mm. The 90° peel adhesion strength of protective film B, that is, the 90° peel adhesion strength of the protective film measured at room temperature under the condition of a tensile speed of 300 mm / min, was 35 (N / 25 mm). When samples according to Examples 1 to 7 above were prepared using protective film B, the impact resistance test evaluation was also good.

[0095] For protective film C, a protective film with a polyurethane base material and an acrylic adhesive layer was used. The thickness of the base material of protective film C was 0.15 mm, the thickness of the adhesive layer was 0.06 mm, and the total thickness of protective film C was 0.21 mm. The 90° peel adhesion strength of protective film C, that is, the 90° peel adhesion strength of the protective film measured at room temperature under the condition of a tensile speed of 300 mm / min, was 21 (N / 25 mm). When samples according to Examples 1 to 7 above were prepared using protective film C, the impact resistance test evaluation was also good.

[0096] For protective film D, a protective film with a thermoplastic polyurethane (TPU) base material was used. The thickness of the base material of protective film D was 0.15 mm. The 90° peel adhesion strength of protective film D, that is, the 90° peel adhesion strength of the protective film measured at room temperature under the condition of a tensile speed of 300 mm / min, was 19 (N / 25 mm). When samples according to Examples 1 to 7 above were prepared using protective film D, the impact resistance test evaluation was also good.

[0097] For protective film E, a protective film with a polycarbonate (PC) base material was used. The thickness of the base material of protective film E was 0.3 mm. The 90° peel adhesion strength of protective film E, that is, the 90° peel adhesion strength of the protective film measured at room temperature under the condition of a tensile speed of 300 mm / min, was 32 (N / 25 mm). When samples according to Examples 1 to 7 above were prepared using protective film E, the impact resistance test evaluation was also good.

[0098] Although the present invention has been described above in accordance with the above embodiments, the present invention is not limited to the configuration of the above embodiments, and of course includes various modifications, alterations, and combinations that can be made by a person skilled in the art within the scope of the claims of the present patent application. [Explanation of symbols]

[0099] 1. 1a~1f Laminated glass for vehicles (laminated glass) 11. First glass plate 12. Second glass plate 13, 13_1, 13_2 Intermediate adhesive layer 15 Functional Films 16 Shading area 17 Unshaded area 18, 19 Recess 21 First Main Surface 22 Second Main Surface 23 Third Main Surface 24 Fourth Main Surface 31 Protective film 31 40 Examination Areas 41. Landing point 43 Examination Slots 45 Iron balls

Claims

1. It comprises a first glass plate, a second glass plate, an intermediate adhesive layer provided between the first and second glass plates, and a functional film provided inside the intermediate adhesive layer. The first glass plate includes a first main surface opposite to the intermediate adhesive layer and a second main surface facing the intermediate adhesive layer. The second glass plate includes a third main surface facing the intermediate adhesive layer and a fourth main surface opposite to the intermediate adhesive layer, The fourth main surface side has a protective film, The protective film, in a plan view of the fourth main surface, overlaps with the functional film in at least a portion thereof, or the distance from the periphery of the functional film is 0.6 mm or less. In a plan view of the fourth main surface, it has a light-shielding region and a non-light-shielding region inside the light-shielding region, The aforementioned light-shielding region is formed of a black ceramic film. The protective film is provided on the black ceramic film. Laminated glass for vehicles.

2. The laminated glass for vehicles according to claim 1, wherein the protective film overlaps with the functional film in at least a portion of the plan view of the fourth main surface.

3. The laminated glass for vehicles according to claim 1 or 2, wherein the protective film completely overlaps with the functional film in a plan view of the fourth main surface.

4. The laminated glass for vehicles according to claim 1 or 2, wherein the protective film is provided so as to straddle the edge of the functional film in a plan view of the fourth main surface.

5. The laminated glass for vehicles according to claim 1 or 2, wherein the functional film has a first recess that is recessed inward when viewed from above.

6. The laminated glass for vehicles according to claim 5, wherein the maximum curvature angle of the first recess is 90° or more.

7. The laminated glass for vehicles according to claim 5, wherein the ratio of the dimension of the protective film in a direction parallel to the straight line to the dimension obtained by drawing a straight line connecting the start point and the end point that form the first recess at the periphery of the functional film is 0.2 or more.

8. The laminated glass for vehicles according to claim 5, wherein the protective film is spaced at least 5 mm away from the periphery of the first glass plate in the first recess.

9. The laminated glass for vehicles according to claim 1 or 2, wherein at least one of the first glass plate and the second glass plate has a second recess that is recessed inward in a plan view.

10. The laminated glass for vehicles according to claim 1 or 2, wherein the total thickness of the protective film is 0.06 mm or more and 3.00 mm or less.

11. The laminated glass for vehicles according to claim 1 or 2, wherein the 90° peel adhesion strength of the protective film, measured at room temperature and a tensile speed of 300 mm / min, is 15 (N / 25 mm) or more.

12. The laminated glass for vehicles according to claim 1 or 2, wherein the total thickness of the thinnest part of the intermediate adhesive layer is 1.10 mm or less.

13. The laminated glass for vehicles according to claim 1 or 2, wherein the protective film overlaps with the light-shielding area.

14. The laminated glass for vehicles according to claim 13, wherein a portion of the protective film overlaps with the non-light-shielding area.

15. The laminated glass for vehicles according to claim 13, wherein the protective film overlaps only with the light-shielding region among the light-shielding region and the non-light-shielding region.

16. The laminated glass for vehicles according to claim 1 or 2, wherein the periphery of the functional film is located at least 10 mm inward from the periphery of at least one of the first glass plate and the second glass plate.

17. The laminated glass for vehicles according to claim 1, wherein the intermediate adhesive layer comprises at least one resin selected from the group consisting of plasticized polyvinyl chloride resin, saturated polyester resin, plasticized saturated polyester resin, polyurethane resin, plasticized polyurethane resin, ethylene-vinyl acetate copolymer resin, ethylene-ethyl acrylate copolymer resin, cycloolefin polymer resin, ionomer resin, acrylic resin, epoxy resin, and silicone resin.

18. The laminated glass for vehicles according to claim 1 or 2, wherein the functional film includes at least one selected from the group consisting of a suspended particle device, a polymer dispersed liquid crystal, a polymer network liquid crystal, a guest-host type liquid crystal, a photochromic device, an electrochromic device, and an electrokinetic device.

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