Interlayer film for laminated glass and laminated glass

Abstract

The present application provides an interlayer for laminated glass, which can inhibit the peeling of the core when being made into a roll. The interlayer for laminated glass has one end and another end located on the opposite side of the one end, and the thickness of the one end is 1.05 mm or less. The interlayer has a first resin layer with a glass transition temperature of less than 15 DEG C and a second resin layer with a glass transition temperature of 15 DEG C or more. The interlayer has a region in which the total number of layers of the first resin layer and the second resin layer in the thickness direction is 5 or more. In the region of 5 or more layers, the thickness of the surface layer is Y1 mu m, the thickness of the layer adjacent to the surface layer is Z mu m, and Y1 / Z is 1.01 or more.

Description

TECHNICAL FIELD

[0001] The present application relates to an interlayer film for a laminated glass for obtaining a laminated glass. Further, the present application relates to a laminated glass using the interlayer film for a laminated glass. BACKGROUND

[0002] A laminated glass is excellent in safety because the amount of flying glass fragments is small even if the glass is broken by external impact. Therefore, the laminated glass is widely used for automobiles, railway vehicles, airplanes, ships, buildings, and the like. The laminated glass is manufactured by interposing an interlayer film between a pair of glass sheets.

[0003] Further, as the laminated glass used in a vehicle, a head-up display (HUD) is known. In the HUD, speed and the like measured information as the running data of the vehicle can be displayed on the windshield of the vehicle, and the display can be reflected in front of the windshield to be recognized by the driver.

[0004] As one example of the laminated glass, a vehicle laminated glass in which two curved glass sheets and a multilayer resin-made interlayer film are laminated is disclosed in Patent Literature 1. The resin-made interlayer film is disposed between the glass sheets. In the vehicle laminated glass, the resin-made interlayer film has a wedge-shaped cross-sectional shape in which the thickness of the upper side is thicker than that of the lower side when the laminated glass is installed in a vehicle as a laminated glass, and has a multilayer film of at least a first resin layer and a second resin layer having a lower hardness than the first resin layer. In the vehicle laminated glass, the thickness of the first resin layer is 0.3 mm or more in a region of 400 mm or less from the lower side.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Laid-Open No. 2007-223883 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] The interlayer film is stored in a state in which the interlayer film is wound around the outer periphery of the winding core to form a roll. When the roll of the interlayer film is stored vertically, the winding core can be detached from the roll. In particular, when the tension at the time of winding the interlayer film around the outer periphery of the winding core is insufficient and the shrinkage of the interlayer film is small, the winding core can be detached from the roll when the roll of the interlayer film is stored vertically.

[0010] Further, in a case where a roll of the interlayer film in which the other end side is on the lower side and the one end side is on the upper side is stored, a difference in tension between the one end side and the other end side can cause the one end side, which is thinner, to be warped or wrinkled. In a case where the wedge-shaped interlayer film is cut from the roll and the interlayer film is left to stand on a flat surface, the wrinkles caused by the warping are likely to remain.

[0011] An object of the present application is to provide an interlayer film for a laminated glass, which can suppress the detachment of a core when the interlayer film is made into a roll. Further, a specific object of the present application is to provide an interlayer film for a laminated glass, which can suppress the remaining of wrinkles in a wedge-shaped interlayer film. Further, an object of the present application is to provide a laminated glass using the interlayer film for a laminated glass.

[0012] Technical means for solving the problem

[0013] According to a broad aspect of the present application, there is provided an interlayer film for a laminated glass (in this specification, an "interlayer film for a laminated glass" is sometimes referred to simply as an "interlayer film"), which has one end and the other end on the opposite side of the one end, the thickness of the one end being 1.05 mm or less, the interlayer film comprising: a first resin layer having a glass transition temperature of less than 15°C and a second resin layer having a glass transition temperature of 15°C or more, the interlayer film having a region in which the total number of layers of the first resin layer and the second resin layer in the thickness direction is 5 or more, and in the region of 5 or more layers, when the thickness of one layer of a surface layer is Y1 μm and the thickness of one layer adjacent to the surface layer is Z μm, Y1 / Z is 1.01 or more.

[0014] In one specific aspect of the interlayer film of the present application, the thickness of the other end is greater than the thickness of the one end.

[0015] In one specific aspect of the interlayer film of the present application, the interlayer film has a region in which the first resin layer and the second resin layer are alternately stacked in the thickness direction.

[0016] In one specific aspect of the interlayer film of the present application, the surface layer is the second resin layer.

[0017] In one specific aspect of the interlayer film of the present application, the interlayer film has a region in which Y2 / X is 0.3 or less, when the thickness of the interlayer film is X μm and the thickness of one layer of a surface layer is Y2 μm.

[0018] In one specific aspect of the interlayer film of the present application, the average thickness of the surface layer in a region from a position 100 mm from the one end toward the other end to a position 400 mm therefrom is less than 300 μm.

[0019] In a specific embodiment of the intermediate film of the present invention, when the average thickness of the surface layer in the region from the position 50 mm toward the other end to the position 150 mm is set to Y3 μm, and the average thickness of the surface layer in the region from the position 50 mm toward the one end to the position 150 mm is set to Y4 μm, Y4 / Y3 is less than 2.5.

[0020] In a specific embodiment of the intermediate film of the present invention, when the average thickness of the layers other than the surface layer in the area from the position 50 mm to the position 150 mm from the one end toward the other end is set to Y5 μm, and the average thickness of the layers other than the surface layer in the area from the position 50 mm to the position 150 mm from the other end toward the one end is set to Y6 μm, Y6 / Y5 is less than 2.5.

[0021] In a specific embodiment of the interlayer film of the present invention, the interlayer film has a display-corresponding region corresponding to a display region of a head-up display, and the average thickness of the surface layer in the display-corresponding region is less than 300 μm.

[0022] In a specific embodiment of the interlayer film of the present invention, when the total thickness of the first resin layers is T1 μm and the total thickness of the second resin layers is T2 μm, the interlayer film has a region where T2 / T1 is 1 or greater.

[0023] According to a broad aspect of the present invention, there is provided a laminated glass comprising: a first laminated glass component; a second laminated glass component; and the interlayer film for laminated glass, wherein the interlayer film for laminated glass is disposed between the first laminated glass component and the second laminated glass component.

[0024] Effects of the Invention

[0025] The interlayer film of the present invention has one end and another end opposite the one end, wherein the thickness of the one end is 1.05 mm or less. The interlayer film of the present invention comprises: a first resin layer having a glass transition temperature of less than 15°C and a second resin layer having a glass transition temperature of 15°C or higher, wherein the interlayer film has a region in which the first resin layer and the second resin layer are laminated in the thickness direction for a total of 5 or more layers. In the interlayer film of the present invention, in the region having 5 or more layers, when the thickness of the surface layer is Y1 μm and the thickness of the layer adjacent to the surface layer is Z μm, Y1 / Z is 1.01 or greater. Due to the above-described structure, the interlayer film of the present invention can suppress detachment of the winding core when formed into a roll. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] [ Figure 1 ] Figure 1(a) and (b) are a cross-sectional view and a front view schematically showing an interlayer film for laminated glass according to the first embodiment of the present application.

[0027] [ Figure 2 ] Figure 2 is a cross-sectional view schematically showing an interlayer film for laminated glass according to the second embodiment of the present application.

[0028] [ Figure 3 ] Figure 3 is a cross-sectional view schematically showing an interlayer film for laminated glass according to the third embodiment of the present application.

[0029] [ Figure 4 ] Figure 4 is a cross-sectional view schematically showing an interlayer film for laminated glass according to the fourth embodiment of the present application.

[0030] [ Figure 5 ] Figure 5 is a cross-sectional view schematically showing an interlayer film for laminated glass according to the fifth embodiment of the present application. Figure 1 is a cross-sectional view showing one example of laminated glass using the interlayer film for laminated glass represented by DETAILED DESCRIPTION

[0031] Hereinafter, the detailed contents of the present application will be explained.

[0032] The interlayer film for laminated glass (in this specification, sometimes simply referred to as "interlayer film") of the present application is used in laminated glass.

[0033] The interlayer film has one end and another end located on the opposite side of the one end. The one end and the other end refer to the end portions of both sides of the interlayer film which are opposite to each other. In the interlayer film, the thickness of the one end is 1.05 mm or less.

[0034] The interlayer film has a first resin layer having a glass transition temperature of less than 15°C and a second resin layer having a glass transition temperature of 15°C or more, and has a region in which the total number of layers of the first resin layer and the second resin layer in the thickness direction is 5 or more.

[0035] In the interlayer film, in the region of 5 or more layers, when the thickness of one layer of a surface layer is set as Y1 μm and the thickness of one layer adjacent to the surface layer is set as Z μm, Y1 / Z is 1.01 or more.

[0036] In the intermediate film of the present application, since the constitution is provided, when a roll is made, the core of the roll can be inhibited from falling off. Further, in the case where the intermediate film of the present application is a wedge-shaped intermediate film in which the thickness of the other end is greater than the thickness of the one end, in addition to the effect, the remaining of a wrinkle can also be inhibited. In the intermediate film of the present application, since the thickness of the one end is 1.05 mm or less, the thickness of the one layer of the first resin layer and the thickness of the one layer of the second resin layer are thin. Therefore, in the present application, the softness of the intermediate film can be improved, and when a roll is made, the intermediate film can be wound at a higher tension. Therefore, the core of the roll can be inhibited from falling off. Further, in the case where the intermediate film of the present application is the wedge-shaped intermediate film, even when a roll is stored in a state where the other end side is set to the lower side and the one end side is set to the upper side, and a wrinkle based on warping is generated, in the case where the intermediate film is cut out from the roll and the intermediate film is left on a flat portion, the height of the wrinkle can be inhibited.

[0037] Further, in the conventional wedge-shaped intermediate film in which the thickness of the other end is greater than the thickness of the one end, sometimes there is a large difference in the shrinkage rate between the one end side and the other end side, and when a roll is made, the winding length at the one end side and the other end side can be different. Therefore, in the conventional wedge-shaped intermediate film, when the intermediate film is unwound from the roll, the other end side, which is thicker, can not follow the roll, and the intermediate film can not be uniformly heated in the direction connecting the one end and the other end of the intermediate film. In contrast, in the intermediate film of the present application, the shrinkage rate can be reduced, and therefore, when a roll is made, the difference in the winding length at the one end side and the other end side can be inhibited to be low, and as a result, the intermediate film can be uniformly heated.

[0038] Further, the intermediate film of the present application has the first resin layer having a glass transition temperature of less than 15°C, and therefore, the sound insulation property can be effectively improved.

[0039] The intermediate film has a region in which the total number of layers of the first resin layer and the second resin layer in the thickness direction is 5 or more. In the region, the total number of layers of the first resin layer and the second resin layer in the thickness direction can be 5, can be 6 or more, can be 7 or more, can be 8 or more, can be 9 or more, or can be 10 or more. In the region, the total number of layers of the first resin layer and the second resin layer in the thickness direction can be 20 or less, can be 15 or less, can be 10 or less, can be 9 or less, can be 8 or less, or can be 6 or less. In the region, the total number of layers of the first resin layer and the second resin layer in the thickness direction is preferably 5, 7, or 11, more preferably 5 or 7, and further preferably 5. In this case, the generation of a flow mark can be effectively inhibited. In particular, in the case where the total number of layers of the first resin layer and the second resin layer in the thickness direction is 5, the generation of a flow mark can be further effectively inhibited.

[0040] The interlayer film can have a region in which the total number of layers of the first resin layer and the second resin layer in the thickness direction is 5 or more in a part of the interlayer film, and can have it in the entire interlayer film. The structure of the interlayer film can be partially different.

[0041] The area of the region in which the total number of layers of the first resin layer and the second resin layer in the thickness direction is 5 or more in the 100% of the planar area of the interlayer film is preferably 1% or more, more preferably 2% or more, further preferably 3% or more, and particularly preferably 5% or more. The area of the region in which the total number of layers of the first resin layer and the second resin layer in the thickness direction is 5 or more in the 100% of the planar area of the interlayer film can be 50% or more, can be 60% or more, can be 70% or more, and can be 80% or more. The area of the region in which the total number of layers of the first resin layer and the second resin layer in the thickness direction is 5 or more in the 100% of the planar area of the interlayer film is 100% or less.

[0042] The interlayer film has at least one first resin layer having a glass transition temperature of less than 15°C. The interlayer film can have only one first resin layer, can have two, can have two or more, can have three, and can have three or more.

[0043] The interlayer film has at least one second resin layer having a glass transition temperature of 15°C or more. The interlayer film can have only one second resin layer, can have two, can have two or more, can have three, and can have three or more.

[0044] The first resin layer has a glass transition temperature of less than 15°C. The glass transition temperature of the first resin layer is preferably -20°C or more, more preferably -15°C or more, further preferably -10°C or more, preferably 10°C or less, more preferably 5°C or less, and further preferably 0°C or less. When the glass transition temperature is the lower limit or more and the upper limit or less, sound insulation of the laminated glass can be further improved.

[0045] The second resin layer has a glass transition temperature of 15°C or more. The glass transition temperature of the second resin layer is preferably 20°C or more, more preferably 25°C or more, further preferably 30°C or more, preferably 50°C or less, more preferably 45°C or less, and further preferably 40°C or less. When the glass transition temperature is the lower limit or more and the upper limit or less, the interlayer film can be used without impairing the operability of the interlayer film while further improving the sound insulation of the laminated glass.

[0046] The absolute value of the difference between the glass transition temperature of the first resin layer and the glass transition temperature of the second resin layer is preferably 10°C or more, more preferably 15°C or more, and is preferably 70°C or less, more preferably 65°C or less. When the absolute value of the difference is the lower limit or more and the upper limit or less, the sound insulation of the laminated glass can be further improved.

[0047] The glass transition temperature is obtained by viscoelasticity measurement. The viscoelasticity measurement is performed in the following manner, for example.

[0048] The test piece is stored in an environment of 23 ± 2°C in temperature and 25 ± 5% in humidity for 12 hours. Subsequently, viscoelasticity is measured using a viscoelasticity measurement device "ARES-G2" manufactured by TA INSTRUMENTS. A parallel plate of 8 mm in diameter is used as a jig, and measurement is performed in a shear mode at a temperature lowering rate of 3°C / minute from 100°C to -20°C, and at a frequency of 1 Hz and a strain of 1%. The peak temperature of the tangent of the loss angle in the obtained measurement result is set as the glass transition temperature Tg (°C).

[0049] Viscoelasticity measurement can be performed using the interlayer film itself. In this case, the peaks of tan δ and the like derived from each layer can be read from the measurement result. Further, the glass transition temperature of the layer to be measured can be measured by peeling the layers of the interlayer film from each other. Further, in the case of a laminated glass, the laminated glass part and the interlayer film can be peeled after cooling the laminated glass with liquid nitrogen or the like, and viscoelasticity measurement can be performed using the interlayer film peeled.

[0050] Note that if the first resin layer has the specific glass transition temperature, the plurality of first resin layers in the interlayer film can not have the same glass transition temperature. Further, if the second resin layer has the specific glass transition temperature, the plurality of second resin layers in the interlayer film can not have the same glass transition temperature.

[0051] From the viewpoint of further effectively exerting the effects of the present application, it is preferable that the first resin layer and the second resin layer are alternately stacked in the thickness direction. From the viewpoint of further more effectively exerting the effects of the present application, the first resin layer and the second resin layer are preferably alternately stacked in the thickness direction.

[0052] The number of layers of the first resin layer and the number of layers of the second resin layer can be the same or different. From the viewpoint of further effectively exerting the effects of the present application, the number of layers of the first resin layer is preferably lower than the number of layers of the second resin layer.

[0053] The intermediate film has a structure of 5 or more layers, and thus has two surface layers (a first surface layer and a second surface layer).

[0054] In the intermediate film, the first resin layer can be provided as the surface layer, and the second resin layer can be provided as the surface layer. In the intermediate film, the first resin layer can be provided as the first surface layer, and the second resin layer can be provided as the second surface layer.

[0055] The surface layer is preferably the second resin layer. In this case, the effects of the present application can be further effectively exerted, and the sound insulation and the penetration resistance of the laminated glass can be further improved, and the optical distortion can be effectively suppressed. In addition, in this case, the degassing property at the time of producing the laminated glass can be improved.

[0056] In the region of 5 or more layers of the intermediate film, the thickness of the surface layer is Y1 pm, and the thickness of the layer adjacent to the surface layer is Z pm. Y1 is the thickness of the surface layer at the given position in the region of 5 or more layers, and Z is the thickness of the layer adjacent to the surface layer at the same position as the given position.

[0057] In the intermediate film, Y1 / Z is 1.01 or more, preferably 1.1 or more, more preferably 1.2 or more, and preferably 15 or less, more preferably 14 or less. When the Y1 / Z is the lower limit or more and the upper limit or less, the core of the roll can be prevented from falling off. The relationship of Y1 / Z is satisfied in at least one of the first surface layer and the second surface layer, and preferably satisfied in both. Note that the preferred modes described in the present specification with respect to the surface layer are satisfied in at least one of the first surface layer and the second surface layer, and preferably satisfied in both.

[0058] The thickness of the intermediate film is X pm, and the thickness of the surface layer is Y2 pm. X is the thickness of the intermediate film at the given position, and Y2 is the thickness of the surface layer at the same position as the given position. Note that Y1 and Y2 can be the same or different.

[0059] The intermediate film preferably has a region in which the value of Y2 / X is 0.3 or less (hereinafter, sometimes referred to as region A). That is, the intermediate film preferably has a region (region A) in which the ratio of the thickness of the surface layer (Y2) to the thickness of the intermediate film (X) is 0.3 or less. The relationship of Y2 / X is preferably satisfied in at least one of the first surface layer and the second surface layer, and more preferably satisfied in both.

[0060] In the region A, the value of Y2 / X is preferably 0.01 or greater, more preferably 0.05 or greater, and preferably 0.29 or less, more preferably 0.28 or less. When the value of Y2 / X is the lower limit or greater, the sound insulation of the laminated glass can be further improved. When the value of Y2 / X is the upper limit or less, the penetration resistance of the laminated glass can be further improved, and optical distortion can be effectively suppressed. When the value of Y2 / X is the lower limit or greater and the upper limit or less, the effects of the present application can be further effectively exerted. The above-described relationship of Y2 / X preferably holds in at least one of the first surface layer and the second surface layer, and more preferably holds in both.

[0061] The region A is preferably present from a position 0 mm from the one end toward the other end to a position 1000 mm, and more preferably from a position 50 mm from the one end toward the other end to a position 950 mm (in this case, the region A can also be present at other positions). In this case, the effects of the present application can be further effectively exerted, the sound insulation and the penetration resistance of the laminated glass can be further improved, and optical distortion can be effectively suppressed.

[0062] The distance between the one end and the other end of the interlayer film is set to L. The region A is preferably present from a position 0L from the one end toward the other end to a position 1.0L. The region A is more preferably present from a position 0L from the one end toward the other end to a position 0.99L, and further preferably from a position 0L from the one end toward the other end to a position 0.95L (in this case, the region A can also be present at other positions). In this case, the effects of the present application can be further effectively exerted, the sound insulation and the penetration resistance of the laminated glass can be further improved, and optical distortion can be effectively suppressed.

[0063] The average thickness of the surface layer in a region from a position 50 mm from the one end toward the other end to a position 150 mm is set to Y3 μm, and the average thickness of the surface layer in a region from a position 50 mm from the other end toward the one end to a position 150 mm is set to Y4 μm. Note that Y3 and Y1 can be the same or different. Furthermore, Y3 and Y2 can be the same or different.

[0064] From the viewpoint of further effectively exerting the effect of the present application, in the intermediate film, Y4 / Y3 is preferably 0.3 or more, more preferably 0.5 or more, further preferably 0.7 or more, further preferably 0.9 or more. From the viewpoint of further effectively exerting the effect of the present application, in the intermediate film, Y4 / Y3 is preferably 2.5 or less, more preferably 2.3 or less, further preferably 2.0 or less, further preferably 1.7 or less, more further preferably 1.5 or less, particularly preferably 1.3 or less, most preferably 1.1 or less. The above-described relationship of Y4 / Y3 is preferably satisfied in at least one of the first surface layer and the second surface layer, more preferably satisfied in both.

[0065] The average thickness of the layers other than the surface layer in the region from the position 50 mm from the one end toward the other end to the position 150 mm is set to Y5 μm, and the average thickness of the layers other than the surface layer in the region from the position 50 mm from the other end toward the one end to the position 150 mm is set to Y6 μm.

[0066] From the viewpoint of further effectively exerting the effect of the present application, in the intermediate film, Y6 / Y5 is preferably 0.3 or more, more preferably 0.5 or more, further preferably 0.7 or more, further preferably 0.9 or more. From the viewpoint of further effectively exerting the effect of the present application, in the intermediate film, Y6 / Y5 is preferably 2.5 or less, more preferably 2.3 or less, further preferably 2.0 or less, further preferably 1.7 or less, more further preferably 1.5 or less, particularly preferably 1.3 or less, most preferably 1.1 or less. The above-described relationship of Y6 / Y5 is preferably satisfied in at least one of the layers other than the surface layer, more preferably satisfied in all of the layers other than the surface layer.

[0067] From the viewpoint of further effectively exerting the effect of the present application, in the intermediate film, Y4 / Y3 is 2.5 or less, and Y6 / Y5 is particularly preferably 2.5 or less.

[0068] The intermediate film is used, for example, in a laminated glass as a head-up display. In the case where the intermediate film is used in a laminated glass as a head-up display, the intermediate film has a display corresponding region corresponding to a display region of the head-up display. The display corresponding region is a region in which information can be favorably displayed.

[0069] In the intermediate film, the average thickness of the surface layer in the region from the position 100 mm toward the other end to the position 400 mm (hereinafter, sometimes referred to as region B) is preferably 300 μm or less. In the intermediate film, the average thickness of the surface layer in the display corresponding region is preferably 300 μm or less. In this case, the effect of the present application can be further effectively exerted, the sound insulation and the penetration resistance of the laminated glass can be further improved, and optical distortion can be effectively suppressed. The value of the average thickness of the surface layer in the display corresponding region is preferably satisfied in at least one of the first surface layer and the second surface layer, and more preferably satisfied in both.

[0070] The average thickness of the surface layer in the region B or the display corresponding region is preferably 10 μm or more, more preferably 20 μm or more, further preferably 100 μm or more, further preferably 180 μm or more, preferably 350 μm or less, more preferably 295 μm or less, and further preferably 290 μm or less, respectively. When the average thickness of the surface layer is the lower limit or more and the upper limit or less, the effect of the present application can be further effectively exerted, the sound insulation and the penetration resistance of the laminated glass can be further improved, and optical distortion can be effectively suppressed. The value of the average thickness of the surface layer is preferably satisfied in at least one of the first surface layer and the second surface layer, and more preferably satisfied in both.

[0071] The total thickness of the first resin layer is set to T1 μm, and the total thickness of the second resin layer is set to T2 μm. T1 is the thickness of the first resin layer at a given position, and T2 is the thickness of the second resin layer at the same position as the given position.

[0072] The intermediate film preferably has a region in which the value of T2 / T1 is 1 or more (hereinafter, sometimes referred to as region C). That is, the intermediate film preferably has a region (region C) in which the ratio of the total thickness of the second resin layer (T2) to the total thickness of the first resin layer (T1) is 1 or more.

[0073] In the region C, the value of T2 / T1 is preferably 1.01 or more, more preferably 1.02 or more, and preferably 40 or less, and more preferably 38 or less. When the value of T2 / T1 is the lower limit or more, the sound insulation of the laminated glass can be further improved. When the value of T2 / T1 is the upper limit or less, the penetration resistance of the laminated glass can be further improved, and optical distortion can be effectively suppressed. When the value of T2 / T1 is the lower limit or more and the upper limit or less, the effect of the present application can be further effectively exerted.

[0074] The region C is preferably present at least from a position 50 mm from the one end toward the other end to a position 1000 mm, more preferably at least from a position 50 mm from the one end toward the other end to a position 950 mm. In this case, the effect of the present application can be further effectively exerted, sound insulation and penetration resistance of the laminated glass can be further improved, and optical distortion can be effectively suppressed.

[0075] The distance between the one end and the other end of the interlayer film is set to L. The region C is preferably present at least from a position 0L from the one end toward the other end to a position 0.99L, more preferably at least from a position 0L from the one end toward the other end to a position 0.95L. In this case, the effect of the present application can be further effectively exerted, sound insulation and penetration resistance of the laminated glass can be further improved, and optical distortion can be effectively suppressed.

[0076] The thickness of the one end of the interlayer film is 1.05 mm or less. The thickness of the one end of the interlayer film is preferably 0.1 mm or more, more preferably 0.2 mm or more, further preferably 0.3 mm or more, particularly preferably 0.4 mm or more, preferably 1.04 mm or less, more preferably 1.03 mm or less, further preferably 1.0 mm or less. When the thickness of the one end is the lower limit or more and the upper limit or less, the effect of the present application can be further effectively exerted.

[0077] The thickness of the other end of the interlayer film is preferably greater than the thickness of the one end, more preferably greater than 0.01 mm, further preferably greater than 0.05 mm, particularly preferably greater than 0.1 mm. The thickness of the other end of the interlayer film is preferably greater than the thickness of the one end by 5 mm or less, more preferably by 4.8 mm or less, further preferably by 4.6 mm or less. When the thickness of the other end is the lower limit or more and the upper limit or less, the effect of the present application can be further effectively exerted.

[0078] The maximum thickness of the interlayer film is preferably 0.15 mm or more, more preferably 0.25 mm or more, further preferably 0.5 mm or more, particularly preferably 0.8 mm or more, preferably 4 mm or less, more preferably 3.8 mm or less, further preferably 3.6 mm or less.

[0079] The distance between one end and the other end of the intermediate film is set as L. The intermediate film preferably has a minimum thickness in a region from a position 0L from the one end toward the other end to a position 0.2L, and has a maximum thickness in a region from a position 0L from the other end toward the one end to a position 0.2L. The intermediate film more preferably has a minimum thickness in a region from a position 0L from the one end toward the other end to a position 0.1L, and has a maximum thickness in a region from a position 0L from the other end toward the one end to a position 0.1L. The intermediate film preferably has a minimum thickness at one end and has a maximum thickness at the other end. The maximum thickness is the thickness of the portion having the largest thickness. The minimum thickness is the thickness of the portion having the smallest thickness.

[0080] The intermediate film can have a thickness uniform portion. The thickness uniform portion means that the thickness does not change by more than 10 μm in a distance range of 10 cm in the direction connecting the one end and the other end of the intermediate film. Thus, the thickness uniform portion means a portion in which the thickness does not change by more than 10 μm in a distance range of 10 cm in the direction connecting the one end and the other end of the intermediate film. Specifically, the thickness uniform portion means a portion in which the thickness does not change at all in the direction connecting the one end and the other end of the intermediate film, or a portion in which the thickness changes by 10 μm or less in a distance range of 10 cm in the direction connecting the one end and the other end of the intermediate film.

[0081] From the viewpoint of practical use, and the viewpoint of sufficiently improving the adhesion and the penetration resistance, the maximum thickness of the surface layer in the intermediate film is preferably 20 μm or more, more preferably 25 μm or more, further preferably 50 μm or more, and is preferably 2000 μm or less, more preferably 1800 μm or less.

[0082] From the viewpoint of practical use, and the viewpoint of sufficiently improving the penetration resistance, the maximum thickness of the layer (intermediate layer) disposed between the two surface layers in the intermediate film is preferably 60 μm or more, more preferably 80 μm or more, and is preferably 4980 μm or less, more preferably 4800 μm or less.

[0083] The distance L between one end and the other end of the intermediate film is preferably 3 m or less, more preferably 2 m or less, particularly preferably 1.5 m or less, and is preferably 0.5 m or more, more preferably 0.8 m or more, particularly preferably 1 m or more.

[0084] From the viewpoint of further improving the display, the intermediate film preferably has a portion in which the cross-sectional shape in the thickness direction is wedge-shaped. The cross-sectional shape in the thickness direction of the display corresponding region is preferably wedge-shaped.

[0085] In order to suppress ghosting, the wedge angle θ of the interlayer film can be appropriately set in accordance with the installation angle of the laminated glass. The wedge angle θ is the internal angle at the intersection of a straight line connecting the surface portion (1st surface portion) on one side of the interlayer film of the maximum thickness portion and the minimum thickness portion and a straight line connecting the surface portion (2nd surface portion) on the other side of the interlayer film of the maximum thickness portion and the minimum thickness portion.

[0086] The wedge angle θ of the interlayer film is the internal angle at the intersection of a straight line connecting the surface portion (1st surface portion) on one side of the interlayer film of the maximum thickness portion and the minimum thickness portion and a straight line connecting the surface portion (2nd surface portion) on the other side of the interlayer film of the maximum thickness portion and the minimum thickness portion.

[0087] Note that, in the case where a plurality of maximum thickness portions exist, in the case where a plurality of minimum thickness portions exist, in the case where the maximum thickness portion exists in a certain region, or in the case where the minimum thickness portion exists in a certain region, the maximum thickness portion and the minimum thickness portion used to calculate the wedge angle θ are selected in such a manner that the calculated wedge angle θ is the maximum.

[0088] From the viewpoint of further effectively suppressing ghosting, the wedge angle θ of the interlayer film is preferably 0.05 mrad or more, more preferably 0.1 mrad (0.00575 degrees) or more, and further preferably 0.2 mrad (0.0115 degrees) or more. Further, when the wedge angle θ is the lower limit or more, a laminated glass suitable for a vehicle having a large installation angle of a windshield such as a truck or a bus can be obtained.

[0089] From the viewpoint of further effectively suppressing ghosting, the wedge angle θ of the interlayer film is preferably 2 mrad (0.1146 degrees) or less, more preferably 0.7 mrad (0.0401 degrees) or less. Further, when the wedge angle θ is the upper limit or less, a laminated glass suitable for a vehicle having a small installation angle of a windshield such as a sports car can be obtained.

[0090] As a measuring device used to measure the wedge angle (θ) of the interlayer film and the thickness of the interlayer film, a contact-type thickness measuring device "TOF-4R" (manufactured by YAMABUN ELECTRONICS Co., Ltd.) or the like can be used.

[0091] The thickness of the interlayer film was measured using the above measuring device at a film conveying speed of 2.15 mm / min to 2.25 mm / min in such a manner that the shortest distance from one end to the other end.

[0092] Further, as a measuring device used in the measurement of the thickness of each layer of the interlayer film, "SE-3000" (manufactured by SELMIC Co., Ltd.) or the like can be used.

[0093] The thickness of each layer of the interlayer film can be measured as follows. The interlayer film is cut in the thickness direction at the measurement position using a razor, a knife or the like. After the cut section of the interlayer film is observed using the aforementioned measuring device, the thickness of each layer is measured using the calculation software included in the accompanying software.

[0094] As the measuring device used in the measurement of the wedge angle (θ) of the interlayer film after the interlayer film is made into a laminated glass, the thickness of the interlayer film, and the thickness of each layer of the interlayer film, a non-contact multilayer film thickness measuring device "OPTIGAUGE" (manufactured by LUMETRICS Corporation) or the like can be mentioned. When the measuring device is used, the thickness of the interlayer film can be measured in the state of the laminated glass.

[0095] The interlayer film is preferably a HUD interlayer film. The interlayer film preferably has a display corresponding region corresponding to a display region of a HUD.

[0096] From the viewpoint of further effectively suppressing ghosting, the interlayer film preferably has the display corresponding region in a region of the interlayer film from a position 6 cm from the one end toward the other end to a position 63.8 cm from the one end toward the other end.

[0097] From the viewpoint of further effectively suppressing ghosting, the interlayer film more preferably has the display corresponding region in a region of the interlayer film from a position 8 cm from the one end toward the other end to a position 61.8 cm from the one end toward the other end.

[0098] From the viewpoint of further effectively suppressing ghosting, the interlayer film more preferably has the display corresponding region in a region of the interlayer film from a position 9 cm from the one end toward the other end to a position 60.8 cm from the one end toward the other end.

[0099] From the viewpoint of further effectively suppressing ghosting, the interlayer film further preferably has the display corresponding region in a region of the interlayer film from a position 9.5 cm from the one end toward the other end to a position 60.3 cm from the one end toward the other end.

[0100] From the viewpoint of further effectively suppressing ghosting, the interlayer film particularly preferably has the display corresponding region in a region of the interlayer film from a position 10 cm from the one end toward the other end to a position 59.8 cm from the one end toward the other end.

[0101] The display corresponding region can exist in a part of the region from the position (for example, 63.8 mm) of the one end toward the other end of the interlayer film or can exist in the entirety. The display corresponding region can exist in a size of about 30 cm in the connecting direction of the one end and the other end.

[0102] From the viewpoint of effectively suppressing ghosting, it is preferable that the interlayer film have a portion in which the cross-sectional shape in the thickness direction is wedge-shaped in a region from a position 6 cm from the one end toward the other end to a position 63.8 cm from the one end toward the other end of the interlayer film.

[0103] From the viewpoint of effectively suppressing ghosting, it is more preferable that the interlayer film have a portion in which the cross-sectional shape in the thickness direction is wedge-shaped in a region from a position 8 cm from the one end toward the other end to a position 61.8 cm from the one end toward the other end of the interlayer film.

[0104] From the viewpoint of effectively suppressing ghosting, it is more preferable that the interlayer film have a portion in which the cross-sectional shape in the thickness direction is wedge-shaped in a region from a position 9 cm from the one end toward the other end to a position 60.8 cm from the one end toward the other end of the interlayer film.

[0105] From the viewpoint of effectively suppressing ghosting, it is further preferable that the interlayer film have a portion in which the cross-sectional shape in the thickness direction is wedge-shaped in a region from a position 9.5 cm from the one end toward the other end to a position 60.3 cm from the one end toward the other end of the interlayer film.

[0106] From the viewpoint of effectively suppressing ghosting, it is particularly preferable that the interlayer film have a portion in which the cross-sectional shape in the thickness direction is wedge-shaped in a region from a position 10 cm from the one end toward the other end to a position 59.8 cm from the one end toward the other end of the interlayer film.

[0107] The portion in which the cross-sectional shape in the thickness direction is wedge-shaped can exist in a part of the region from the position (for example, 63.8 mm) of the one end toward the other end or can exist in the entirety. The portion in which the cross-sectional shape in the thickness direction is wedge-shaped can exist in a size of about 30 cm in the connecting direction of the one end and the other end.

[0108] The intermediate film can have a shadow region. The shadow region can be separated from the display corresponding region. The shadow region is designed, for example, to prevent the driver from feeling glare due to sunlight or outdoor lighting during driving. The shadow region is also designed to impart heat shielding properties. The shadow region is preferably located at the edge portion of the intermediate film. The shadow region is preferably in a band shape.

[0109] In the shadow region, a colorant or a filler can be used in order to change the color and the visible light transmittance. The colorant or the filler can be contained only in a part of the region in the thickness direction of the intermediate film, or can be contained in the entire region in the thickness direction of the intermediate film.

[0110] From the viewpoint of further good display and further expansion of the field of view, the visible light transmittance of the display corresponding region is preferably 80% or more, more preferably 88% or more, and further preferably 90% or more. The visible light transmittance of the display corresponding region is preferably higher than the visible light transmittance of the shadow region. The visible light transmittance of the display corresponding region can be lower than the visible light transmittance of the shadow region. The visible light transmittance of the display corresponding region is preferably 50% or more higher than the visible light transmittance of the shadow region, and more preferably 60% or more higher.

[0111] Note that, for example, in the intermediate film of the display corresponding region and the shadow region, the visible light transmittance is measured at the center of the display corresponding region and the center of the shadow region in the case where the visible light transmittance varies.

[0112] The visible light transmittance at a wavelength of 380 nm to 780 nm of the obtained laminated glass can be measured using a spectrophotometer (HITACHI HIGH-TECH Co., Ltd., "U-4100") based on JIS R3211:1998. Note that, as the glass plate, a transparent glass having a thickness of 2 mm is preferably used.

[0113] The display corresponding region preferably has a length direction and a width direction. Since the intermediate film is excellent in versatility, the width direction of the display corresponding region is preferably a direction connecting the one end and the other end. The display corresponding region is preferably in a band shape.

[0114] The intermediate film preferably has an MD direction and a TD direction. The intermediate film is obtained, for example, by melt extrusion molding. The MD direction is a flow direction of the intermediate film at the time of production of the intermediate film. The TD direction is a direction perpendicular to the flow direction of the intermediate film at the time of production of the intermediate film, and is a direction perpendicular to the thickness direction of the intermediate film. The one end and the other end are preferably located on both sides in the TD direction.

[0115] Hereinafter, a specific embodiment of the present application will be described with reference to the accompanying drawings.

[0116] Figure 1 (a) and (b) are a cross-sectional view and a front view schematically showing the interlayer film for laminated glass of Embodiment 1 of the present application. Figure 1 (a) is a cross-sectional view taken along the line I-I in (b). Note that, in (a), the thickness of the interlayer film 10 is exaggerated for the purpose of illustration. Figure 1 (b) is a cross-sectional view taken along the line I-I in (b). Note that, in (b), the thickness of the interlayer film 10 is exaggerated for the purpose of illustration. Figure 1 The dimensions and sizes of the interlayer films in the drawings described below and hereinafter are appropriately changed from the actual dimensions and shapes for the purpose of illustration.

[0117] Figure 1 In (a), a cross section in the thickness direction of the interlayer film 10 is shown. Note that, in (a), the thickness of the interlayer film 10 is exaggerated for the purpose of illustration. Figure 1 In (a) and the drawings described hereinafter, the thickness of the interlayer film and each layer constituting the interlayer film, and the wedge angle (θ) are shown in a manner different from the actual thickness and wedge angle for the purpose of illustration.

[0118] The interlayer film 10 is used to obtain laminated glass. The interlayer film 10 is an interlayer film for laminated glass. The interlayer film 10 includes: first resin layers 11, 12 and second resin layers 21, 22, 23. The first resin layers 11, 12 are layers having a glass transition temperature of less than 15°C. The second resin layers 21, 22, 23 are layers having a glass transition temperature of 15°C or more. The interlayer film 10 includes two first resin layers and three second resin layers. In the interlayer film 10, the total number of layers of the first resin layers and the second resin layers in the thickness direction is five. In the interlayer film 10, the first resin layers and the second resin layers are alternately stacked in the thickness direction.

[0119] In the interlayer film 10, the second resin layer 21 and the second resin layer 23 are provided as surface layers. In the interlayer film 10, the first resin layer 11, the second resin layer 22, and the first resin layer 12 are provided as intermediate layers. The first resin layer 11 is disposed and stacked on the first surface side of the second resin layer 22. The first resin layer 12 is disposed and stacked on the second surface side of the second resin layer 22 opposite to the first surface. The second resin layer 21 is disposed and stacked on the surface side of the first resin layer 11 opposite to the second resin layer 22. The second resin layer 23 is disposed and stacked on the surface side of the first resin layer 12 opposite to the second resin layer 22.

[0120] The interlayer film 10 has one end 10a and another end 10b located opposite the one end 10a. The one end 10a and the other end 10b are opposite ends. The first resin layers 11, 12 and the second resin layers 21, 22, 23 have a wedge-shaped cross-section in the thickness direction. The thickness of the first resin layers 11, 12 and the second resin layers 21, 22, 23 is greater on the other end 10b side than on the one end 10a side. Therefore, the thickness of the interlayer film 10 is greater at the other end 10b than at the one end 10a. The interlayer film 10 has a thinner region and a thicker region.

[0121] The intermediate film 10 has a region where the thickness increases from one end 10a to the other end 10b. In the region where the thickness increases, the amount of increase in thickness from the one end 10a to the other end 10b is uniform.

[0122] The interlayer film 10 has a display-corresponding region R1 corresponding to the display area of ​​the head-up display. The interlayer film 10 has a peripheral region R2 surrounding the display-corresponding region R1. The interlayer film 10 has a shaded region R3 separated from the display-corresponding region R1. The shaded region R3 is located at the edge of the interlayer film 10.

[0123] Intermediate film Figure 1 The shape shown in (a) can be more than 6 layers. Figure 1 The shape shown in (a) may not have a display corresponding area and may not have a shadow area. Figure 1 The shape represented by (a) may have a portion where the first resin layer and the second resin layer are not alternately laminated. For example, the laminated structure may be the second resin layer / the first resin layer / the first resin layer / the first resin layer / the second resin layer. Figure 1 (a) The first resin layer may be a surface layer. Figure 1 (a) The cross-sectional shape of the thickness direction of all layers of the first resin layer can be a rectangle, and the cross-sectional shape of the thickness direction of all layers of the second resin layer can be a rectangle. Figure 1 In the shape shown in (a), the cross-sectional shape of at least one of the first resin layers in the thickness direction may be rectangular, and the cross-sectional shape of at least one of the second resin layers in the thickness direction may be rectangular.

[0124] Figure 2 It is a cross-sectional view schematically showing an interlayer film for laminated glass according to a second embodiment of the present invention. Figure 2 , a cross section in the thickness direction of the intermediate film 10A is shown.

[0125] Figure 2The intermediate film 10A shown in the drawing has the first resin layers 11A, 12A and the second resin layers 21A, 22A, 23A. The first resin layers 11A, 12A are layers having a glass transition temperature of less than 15°C. The second resin layers 21A, 22A, 23A are layers having a glass transition temperature of 15°C or more. In the intermediate film 10 and the intermediate film 10A, the increase in thickness in the region where the thickness increases is different.

[0126] The intermediate film 10A has one end 10a and the other end 10b located on the opposite side of the one end 10a. The one end 10a and the other end 10b are end portions on opposite sides of each other. The cross-sectional shape in the thickness direction of the first resin layers 11A, 12A and the second resin layers 21A, 22A, 23A is wedge-shaped. The thickness of the first resin layers 11A, 12A and the second resin layers 21A, 22A, 23A is greater on the other end 10b side than on the one end 10a side. Therefore, the thickness of the other end 10b of the intermediate film 10A is greater than the thickness of the one end 10a. The intermediate film 10A has a region where the thickness is thinner and a region where the thickness is thicker.

[0127] The intermediate film 10A has a region where the thickness increases from the one end 10a side toward the other end 10b side. The intermediate film 10A has, in the region where the thickness increases, a portion where the increase in thickness from the one end 10a side toward the other end 10b side is greater. In addition, the intermediate film 10A has a region where the cross-sectional shape in the thickness direction is wedge-shaped. The intermediate film 10A has, in the region where the cross-sectional shape in the thickness direction is wedge-shaped, a portion where the wedge angle from the one end side toward the other end side is greater.

[0128] The intermediate film 10A has a display corresponding region R1 corresponding to a display region of a head-up display. The intermediate film 10A has a surrounding region R2 around the display corresponding region R1. The intermediate film 10A has a shadow region R3 separate from the display corresponding region R1. The shadow region R3 is located at an edge portion of the intermediate film 10A.

[0129] The intermediate film can have a shape shown in the drawing. Figure 2 In addition, the intermediate film can have a shape shown in the drawing, and can have six or more layers. Furthermore, the intermediate film can have a shape shown in the drawing, and can not have a display corresponding region, and can not have a shadow region. In addition, the intermediate film can have a shape shown in the drawing, and can have a portion where the first resin layers and the second resin layers are not alternately stacked. Furthermore, the intermediate film can have a shape shown in the drawing, and the first resin layers can be surface layers. In addition, the intermediate film can have a shape shown in the drawing, and the cross-sectional shape in the thickness direction of all the layers of the first resin layers can be rectangular, and the cross-sectional shape in the thickness direction of all the layers of the second resin layers can be rectangular. Furthermore, the intermediate film can have a shape shown in the drawing, and the first resin layers can be surface layers. Figure 2 Figure 2 Figure 2 Figure 2 Figure 3 ​​​​Regarding the shape shown, the cross-sectional shape of at least one of the first resin layers in the thickness direction may be rectangular, and the cross-sectional shape of at least one of the second resin layers in the thickness direction may be rectangular.

[0130] Figure 3 It is a cross-sectional view schematically showing an interlayer film for laminated glass according to a third embodiment of the present invention. Figure 3 , a cross section in the thickness direction of the interlayer film 10B is shown.

[0131] Figure 3 The interlayer film 10B shown includes first resin layers 11B and 12B and second resin layers 21B, 22B, and 23B. The first resin layers 11B and 12B have a glass transition temperature of less than 15°C. The second resin layers 21B, 22B, and 23B have a glass transition temperature of 15°C or higher. The interlayer film 10 and the interlayer film 10B differ in the amount of increase in thickness in the region where the thickness increases.

[0132] The interlayer film 10B has one end 10a and another end 10b located opposite the one end 10a. The one end 10a and the other end 10b are opposite ends. The first resin layers 11B, 12B and the second resin layers 21B, 22B, and 23B have a wedge-shaped cross-section in the thickness direction. The thickness of the first resin layers 11B, 12B and the second resin layers 21B, 22B, and 23B is greater on the other end 10b side than on the one end 10a side. Therefore, the thickness of the interlayer film 10B is greater on the other end 10b side than on the one end 10a. The interlayer film 10B has a thinner region and a thicker region.

[0133] The interlayer film 10B has a region where the thickness increases from one end 10a toward the other end 10b. Within this region of increasing thickness, the interlayer film 10B has a portion where the amount of increase in thickness decreases from one end 10a toward the other end 10b. Furthermore, the interlayer film 10B has a region with a wedge-shaped cross-section in the thickness direction. Within this region of the wedge-shaped cross-section in the thickness direction, the interlayer film 10B has a portion where the wedge angle decreases from one end toward the other end.

[0134] The interlayer film 10B has a display-corresponding region R1 corresponding to the display area of ​​the head-up display. The interlayer film 10B has a peripheral region R2 surrounding the display-corresponding region R1. The interlayer film 10B has a shaded region R3 separated from the display-corresponding region R1. The shaded region R3 is located at the edge of the interlayer film 10B.

[0135] Intermediate film Figure 3 The shape represented by can be more than 6 layers. Figure 3 The shape represented by , may not have a display corresponding area, may not have a shadow area. Figure 3The shape indicated by the arrow A can have a portion in which the first resin layer and the second resin layer are not alternately laminated. Further, the intermediate film can have a shape indicated by the arrow B. Figure 3 The shape indicated by the arrow A can have a portion in which the first resin layer and the second resin layer are not alternately laminated. Further, the intermediate film can have a shape indicated by the arrow B. Figure 4 The shape indicated by the arrow A can have a portion in which the first resin layer and the second resin layer are not alternately laminated. Further, the intermediate film can have a shape indicated by the arrow B. Figure 4 The shape indicated by the arrow A can have a portion in which the first resin layer and the second resin layer are not alternately laminated. Further, the intermediate film can have a shape indicated by the arrow B.

[0136] Figure 1 is a cross-sectional view schematically showing an intermediate film for laminated glass according to a fourth embodiment of the present application. Figure 1 In the drawing, a cross section in the thickness direction of the intermediate film 10C is shown.

[0137] The intermediate film 10C has one end 10a and another end 10b located on the opposite side of the one end 10a. The one end 10a and the other end 10b are end portions on opposite sides of each other. The cross-sectional shape in the thickness direction of the first resin layers 11C, 12C and the second resin layer 22C is wedge-shaped. The thickness of the first resin layers 11C, 12C and the second resin layer 22C is greater on the other end 10b side than on the one end 10a side. The thickness of the other end 10b of the intermediate film 10C is greater than the thickness of the one end 10a. The intermediate film 10C has a region with a relatively thin thickness and a region with a relatively thick thickness.

[0138] The intermediate film 10C has a region in which the thickness increases from the one end 10a side toward the other end 10b side. In the intermediate film 10C, the amount of increase in thickness from the one end 10a side toward the other end 10b side is uniform in the region in which the thickness increases.

[0139] The intermediate film 10C has the first resin layers 11C, 12C and the second resin layers 21C, 22C, 23C. The first resin layers 11C, 12C are layers having a glass transition temperature of less than 15°C. The second resin layers 21C, 22C, 23C are layers having a glass transition temperature of 15°C or more. The second resin layer 21C and the second resin layer 23C are integrated at the one end 10a side and the other end 10b side. The first resin layers 11C, 12C and the second resin layer 22C are buried between the second resin layer 21C and the second resin layer 23C. The intermediate film 10C has a portion having a structure of five layers and a portion having a structure of one layer. The intermediate film 10C has a region in which the first resin layer and the second resin layer are alternately laminated in the thickness direction.

[0140] The interlayer film 10C has a display corresponding region Rl corresponding to a display region of the head-up display. The interlayer film 10C has a peripheral region R2 around the display corresponding region Rl. The interlayer film 10C has a shaded region R3 separate from the display corresponding region Rl. The shaded region R3 is located at an edge portion of the interlayer film 10C.

[0141] In the display corresponding region Rl, the interlayer film 10C has a 5-layer structure. Further, in a region from a position of 100 mm to a position of 400 mm from the one end 10a toward the other end 10b, the interlayer film 10C has a 5-layer structure.

[0142] In the interlayer film, the cross-sectional shape of the first resin layer in the thickness direction can be wedge-shaped, or can be rectangular. The cross-sectional shape of the first resin layer in the thickness direction is preferably wedge-shaped. In the interlayer film, the cross-sectional shape of the second resin layer in the thickness direction can be wedge-shaped, or can be rectangular. The cross-sectional shape of the second resin layer in the thickness direction is preferably wedge-shaped.

[0143] Hereinafter, each material that can be used in the interlayer film of the present application is described in detail.

[0144] (Thermoplastic Resin)

[0145] The interlayer contains a resin (hereinafter, sometimes referred to as resin (0)). The interlayer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (0)). The interlayer preferably contains a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (0)) as the thermoplastic resin (0). The first resin layer contains a resin (hereinafter, sometimes referred to as resin (1)). The first resin layer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (1)). The first resin layer preferably contains a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (1)) as the thermoplastic resin (1). The second resin layer contains a resin (hereinafter, sometimes referred to as resin (2)). The second resin layer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (2)). The second resin layer preferably contains a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (2)) as the thermoplastic resin (2). The resin (1) and the resin (2) can be the same or different. The thermoplastic resin (1) and the thermoplastic resin (2) can be the same or different. The thermoplastic resin (1) and the thermoplastic resin (2) are preferably each a polyvinyl acetal resin. The polyvinyl acetal resin (1) and the polyvinyl acetal resin (2) can be the same or different. The thermoplastic resin (0), the thermoplastic resin (1), and the thermoplastic resin (2) can each be used singly or in combination with two or more. The polyvinyl acetal resin (0), the polyvinyl acetal resin (1), and the polyvinyl acetal resin (2) can each be used singly or in combination with two or more.

[0146] As the thermoplastic resin, there can be mentioned a polyvinyl acetal resin, an ethylene-vinyl acetate copolymer resin, an ethylene-acrylic acid copolymer resin, a polyurethane resin, an ionomer resin, a polyvinyl alcohol resin, and the like. Thermoplastic resins other than these can also be used.

[0147] The polyvinyl acetal resin is manufactured, for example, by acetalizing polyvinyl alcohol (PVA) with an aldehyde. The polyvinyl acetal resin is preferably an acetalized product of polyvinyl alcohol. The polyvinyl alcohol is obtained, for example, by saponifying polyvinyl acetate. The saponification degree of the polyvinyl alcohol is generally in the range of 70 mol% to 99.9 mol%.

[0148] The average polymerization degree of the polyvinyl alcohol (PVA) is preferably 200 or more, more preferably 500 or more, further preferably 1500 or more, more further preferably 1600 or more, particularly preferably 2600 or more, most preferably 2700 or more, and preferably 5000 or less, more preferably 4000 or less, further preferably 3500 or less. If the average polymerization degree is the lower limit or more, the penetration resistance of the laminated glass is further improved. If the average polymerization degree is the upper limit or less, the intermediate film becomes easy to form.

[0149] The average polymerization degree of the polyvinyl alcohol is found by the method according to JIS K6726 "Test Methods for Polyvinyl Alcohol".

[0150] The number of carbon atoms of the acetal group contained in the polyvinyl acetal resin is not particularly limited. The aldehyde used in the production of the polyvinyl acetal resin is not particularly limited. The number of carbon atoms of the acetal group in the polyvinyl acetal resin is preferably 3 to 5, more preferably 3 or 4. If the number of carbon atoms of the acetal group in the polyvinyl acetal resin is 3 or more, the glass transition temperature of the intermediate film is sufficiently lowered. The number of carbon atoms of the acetal group in the polyvinyl acetal resin can be 4 or 5.

[0151] The aldehyde is not particularly limited. In general, an aldehyde having 1 to 10 carbon atoms is suitably used. As the aldehyde having 1 to 10 carbon atoms, propyl aldehyde, n-butyl aldehyde, isobutyl aldehyde, n-pentyl aldehyde, 2-ethylbutyl aldehyde, n-hexyl aldehyde, n-octyl aldehyde, n-nonyl aldehyde, n-decyl aldehyde, formaldehyde, acetaldehyde, and benzaldehyde, etc. can be mentioned. The aldehyde is preferably propyl aldehyde, n-butyl aldehyde, isobutyl aldehyde, n-hexyl aldehyde, or n-pentyl aldehyde, more preferably propyl aldehyde, n-butyl aldehyde, or isobutyl aldehyde, further preferably n-butyl aldehyde. The aldehyde can be used alone or in combination of two or more.

[0152] The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (0) is preferably 15 mol% or more, more preferably 18 mol% or more, and preferably 40 mol% or less, more preferably 35 mol% or less. When the hydroxyl group content is the lower limit or more, the adhesion of the intermediate film is further increased. Further, when the hydroxyl group content is the upper limit or less, the softness of the intermediate film is increased, and the handling of the intermediate film becomes easy.

[0153] The hydroxyl content (hydroxyl amount) of the polyvinyl acetal resin (1) is preferably 17 mol% or more, more preferably 20 mol% or more, and even more preferably 22 mol% or more. The hydroxyl content (hydroxyl amount) of the polyvinyl acetal resin (1) is preferably 30 mol% or less, more preferably 28 mol% or less, even more preferably 27 mol% or less, even more preferably 25 mol% or less, particularly preferably less than 25 mol%, and most preferably 24 mol% or less. When the hydroxyl content is above the lower limit, the mechanical strength of the interlayer film is further improved. In particular, when the hydroxyl content of the polyvinyl acetal resin (1) is 20 mol% or more, the reaction efficiency is high and the productivity is excellent. When it is 30 mol% or less, the sound insulation of the laminated glass is further improved, and when it is 28 mol% or less, the sound insulation is further improved. In addition, when the hydroxyl content is below the upper limit, the flexibility of the interlayer film is improved, and the handling of the interlayer film is facilitated.

[0154] The hydroxyl content of the polyvinyl acetal resin (2) is preferably 25 mol% or more, more preferably 28 mol% or more, more preferably 30 mol% or more, further preferably more than 31 mol%, further preferably 31.5 mol% or more, particularly preferably 32 mol% or more, and most preferably 33 mol% or more. The hydroxyl content of the polyvinyl acetal resin (2) is preferably 38 mol% or less, more preferably 37 mol% or less, further preferably 36.5 mol% or less, and particularly preferably 36 mol% or less. When the hydroxyl content is above the lower limit, the adhesive strength of the interlayer film is further improved. In addition, when the hydroxyl content is below the upper limit, the flexibility of the interlayer film is improved, and the handling of the interlayer film is facilitated.

[0155] From the viewpoint of further improving sound insulation, the hydroxyl content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl content of the polyvinyl acetal resin (2). From the viewpoint of further improving sound insulation, the absolute value of the difference between the hydroxyl content of the polyvinyl acetal resin (1) and the hydroxyl content of the polyvinyl acetal resin (2) is preferably 1 mol% or more, more preferably 5 mol% or more, further preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more.

[0156] The hydroxyl content of the polyvinyl acetal resin is a molar fraction calculated by dividing the amount of ethylene groups bonded with hydroxyl groups by the total amount of ethylene groups in the main chain, expressed as a percentage. The amount of ethylene groups bonded with hydroxyl groups can be measured, for example, in accordance with JIS K6728 "Testing methods for polyvinyl butyral."

[0157] The acetylation degree (acetyl group amount) of the polyvinyl acetal resin (0) is preferably 0.1 mol% or more, more preferably 0.3 mol% or more, further preferably 0.5 mol% or more, and is preferably 30 mol% or less, more preferably 25 mol% or less, further preferably 20 mol% or less. When the acetylation degree is the lower limit or more, the compatibility of the polyvinyl acetal resin with the plasticizer becomes high. When the acetylation degree is the upper limit or less, the moisture resistance of the interlayer film and the laminated glass becomes high.

[0158] The acetylation degree (acetyl group amount) of the polyvinyl acetal resin (1) is preferably 0.01 mol% or more, more preferably 0.1 mol% or more, further preferably 7 mol% or more, more further preferably 9 mol% or more, and is preferably 30 mol% or less, more preferably 25 mol% or less, further preferably 24 mol% or less, particularly preferably 20 mol% or less. When the acetylation degree is the lower limit or more, the compatibility of the polyvinyl acetal resin with the plasticizer becomes high. When the acetylation degree is the upper limit or less, the moisture resistance of the interlayer film and the laminated glass becomes high. Particularly, if the acetylation degree of the polyvinyl acetal resin (1) is 0.1 mol% or more and 25 mol% or less, the penetration resistance is excellent.

[0159] The acetylation degree of the polyvinyl acetal resin (2) is preferably 0.01 mol% or more, more preferably 0.5 mol% or more, and is preferably 10 mol% or less, more preferably 2 mol% or less. When the acetylation degree is the lower limit or more, the compatibility of the polyvinyl acetal resin with the plasticizer becomes high. When the acetylation degree is the upper limit or less, the moisture resistance of the interlayer film and the laminated glass becomes high.

[0160] The acetylation degree is a value expressed in percentage of the molar fraction obtained by dividing the amount of ethylene group to which an acetyl group is bonded by the total amount of ethylene group of the main chain. The amount of ethylene group to which an acetyl group is bonded can be measured, for example, in accordance with JIS K6728 "Polyvinyl Butyral Test Method".

[0161] The acetalization degree (butyralization degree in the case of polyvinyl butyral resin) of the polyvinyl acetal resin (0) is preferably 60 mol% or more, more preferably 63 mol% or more, and is preferably 85 mol% or less, more preferably 75 mol% or less, further preferably 70 mol% or less. If the acetalization degree is the lower limit or more, the compatibility of the polyvinyl acetal resin with the plasticizer becomes high. If the acetalization degree is the upper limit or less, the reaction time required for the production of the polyvinyl acetal resin becomes short.

[0162] The acetalization degree (butyralization degree in the case of polyvinyl butyral resin) of the polyvinyl acetal resin (1) is preferably 47 mol% or more, more preferably 60 mol% or more, and preferably 85 mol% or less, more preferably 80 mol% or less, further preferably 75 mol% or less. If the acetalization degree is the lower limit or more, the compatibility of the polyvinyl acetal resin with the plasticizer becomes high. If the acetalization degree is the upper limit or less, the reaction time required for producing the polyvinyl acetal resin becomes short.

[0163] The acetalization degree (butyralization degree in the case of polyvinyl butyral resin) of the polyvinyl acetal resin (2) is preferably 55 mol% or more, more preferably 60 mol% or more, and preferably 75 mol% or less, more preferably 71 mol% or less. When the acetalization degree is the lower limit or more, the compatibility of the polyvinyl acetal resin with the plasticizer becomes high. When the acetalization degree is the upper limit or less, the reaction time required for producing the polyvinyl acetal resin becomes short.

[0164] The acetalization degree is obtained in the following manner. First, a value obtained by subtracting the amount of ethylene group to which a hydroxyl group is bonded and the amount of ethylene group to which an acetyl group is bonded from the total amount of ethylene group of the main chain is obtained. The obtained value is divided by the total amount of ethylene group of the main chain to obtain a mole fraction. The acetalization degree is a value in which the mole fraction is expressed in percentage.

[0165] It is to be noted that the hydroxyl content (hydroxyl amount), the acetalization degree (butyralization degree), and the acetylation degree are preferably calculated from the results measured by the method according to JIS K6728 "Test method for polyvinyl butyral". However, the measurement according to ASTM D1396-92 can also be used. In the case where the polyvinyl acetal resin is a polyvinyl butyral resin, the hydroxyl content (hydroxyl amount), the acetalization degree (butyralization degree), and the acetylation degree can be calculated from the results measured by the method according to JIS K6728 "Test method for polyvinyl butyral".

[0166] The content of the polyvinyl acetal resin in the thermoplastic resin contained in the interlayer film is preferably 10% by weight or more, more preferably 30% by weight or more, further preferably 50% by weight or more, further preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more, out of 100% by weight of the thermoplastic resin. The content of the polyvinyl acetal resin in the thermoplastic resin contained in the interlayer film can be 100% by weight or less out of 100% by weight of the thermoplastic resin. The main component (50% by weight or more) of the thermoplastic resin of the interlayer film is preferably the polyvinyl acetal resin.

[0167] The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the first resin layer is preferably 10% by weight or more, more preferably 30% by weight or more, further preferably 50% by weight or more, further preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the first resin layer is preferably 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin of the first resin layer is preferably a polyvinyl acetal resin.

[0168] The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the second resin layer is preferably 10% by weight or more, more preferably 30% by weight or more, further preferably 50% by weight or more, further preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the second resin layer can be 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin of the second resin layer is preferably a polyvinyl acetal resin.

[0169] (Plasticizer)

[0170] From the viewpoint of further improving the adhesion of the interlayer film, the interlayer film of the present application preferably contains a plasticizer (hereinafter sometimes referred to as plasticizer (0)). The first resin layer preferably contains a plasticizer (hereinafter sometimes referred to as plasticizer (1)). The second resin layer preferably contains a plasticizer (hereinafter sometimes referred to as plasticizer (2)). In the case where the thermoplastic resin contained in the interlayer film is a polyvinyl acetal resin, the interlayer film (each layer) particularly preferably contains a plasticizer. The layer containing a polyvinyl acetal resin preferably contains a plasticizer.

[0171] The plasticizer is not particularly limited. As the plasticizer, a publicly known plasticizer can be used. The plasticizer can be used alone or in combination with two or more kinds.

[0172] As the plasticizer, an organic ester plasticizer such as a mono- or poly- organic acid ester, an organic phosphoric acid plasticizer, and an organic phosphorous acid plasticizer can be mentioned. The plasticizer is preferably an organic ester plasticizer. The plasticizer is preferably a liquid plasticizer.

[0173] As the mono-organic acid ester, a diol ester obtained by the reaction of a diol and a mono-organic acid, or the like can be mentioned. As the diol, triethylene glycol, tetraethylene glycol, tripropylene glycol, and the like can be mentioned. As the mono-organic acid, butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptanoic acid, n-octanoic acid, 2-ethylhexanoic acid, n-nonanoic acid, decanoic acid, benzoic acid, and the like can be mentioned.

[0174] As the polybasic organic acid ester, an ester compound formed from a polybasic organic acid and an alcohol having a linear or branched structure with a carbon number of 4 to 8, or the like can be given. As the polybasic organic acid, adipic acid, sebacic acid, and azelaic acid, or the like can be given.

[0175] As the organic ester plasticizer, triethylene glycol di-2-ethylpropionate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dioctanoate, triethylene glycol di-n-octanoate, triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethylbutyrate, 1,3-propanediol di-2-ethylbutyrate, 1,4-butanediol di-2-ethylbutyrate, diethylene glycol di-2-ethylbutyrate, diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylpentanoate, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol dioctanoate, diethylene glycol dibenzoate, dipropylene glycol dibenzoate, dihexyl adipate, dioctyl adipate, hexylcyclohexyl adipate, a mixture of heptyl adipate and nonyl adipate, diisononyl adipate, diisodecyl adipate, heptylnonyl adipate, dibutyl sebacate, oil-modified sebacic acid glycol, and a mixture of a phosphate ester and an adipate ester, or the like can be given. As the organic ester plasticizer, an organic ester plasticizer other than these can also be used. Furthermore, as the adipate ester, an adipate ester other than the adipate ester can also be used.

[0176] As the organic phosphate plasticizer, tributoxyethyl phosphate, isodecyl phenyl phosphate, and triisopropyl phosphate, or the like can be given.

[0177] The plasticizer is preferably a diester plasticizer represented by the following formula (1).

[0178] [Chemical Formula 1]

[0179]

[0180] In the formula (1), R1and R2each represent an organic group having a carbon number of 2 to 10, R3represents an ethylene group, an isopropylene group, or a n-propylene group, and p represents an integer of 3 to 10. R1and R2in the formula (1) are each preferably an organic group having a carbon number of 5 to 10, and more preferably an organic group having a carbon number of 6 to 10.

[0181] The plasticizer preferably contains triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH), or triethylene glycol di-2-ethylpropionate. The plasticizer more preferably contains triethylene glycol di-2-ethylhexanoate (3GO) or triethylene glycol di-2-ethylbutyrate (3GH), and further preferably contains triethylene glycol di-2-ethylhexanoate (3GO).

[0182] In the intermediate film, the content of the plasticizer (0) relative to 100 parts by weight of the thermoplastic resin (0) is set as content (0). The content (0) is preferably 5 parts by weight or more, more preferably 25 parts by weight or more, and further preferably 30 parts by weight or more, and is preferably 100 parts by weight or less, more preferably 60 parts by weight or less, and further preferably 50 parts by weight or less. When the content (0) is the lower limit or more, the penetration resistance of the laminated glass is further increased. When the content (0) is the upper limit or less, the transparency of the intermediate film is further increased.

[0183] In the first resin layer, the content of the plasticizer (1) relative to 100 parts by weight of the thermoplastic resin (1) is set as content (1). The content (1) is preferably 50 parts by weight or more, more preferably 55 parts by weight or more, and further preferably 60 parts by weight or more. The content (1) is preferably 100 parts by weight or less, more preferably 90 parts by weight or less, further preferably 85 parts by weight or less, and particularly preferably 80 parts by weight or less. When the content (1) is the lower limit or more, the softness of the intermediate film is increased, and the handling of the intermediate film becomes easy. When the content (1) is the upper limit or less, the penetration resistance of the laminated glass is further increased.

[0184] In the second resin layer, the content of the plasticizer (2) relative to 100 parts by weight of the thermoplastic resin (2) is set as content (2). The content (2) is preferably 5 parts by weight or more, more preferably 10 parts by weight or more, further preferably 15 parts by weight or more, further preferably 20 parts by weight or more, particularly preferably 24 parts by weight or more, and most preferably 25 parts by weight or more. The content (2) is preferably 45 parts by weight or less, more preferably 40 parts by weight or less, further preferably 35 parts by weight or less, particularly preferably 32 parts by weight or less, and most preferably 30 parts by weight or less. When the content (2) is the lower limit or more, the softness of the intermediate film is increased, and the handling of the intermediate film becomes easy. When the content (2) is the upper limit or less, the penetration resistance of the laminated glass is further increased.

[0185] In order to increase the sound insulation of the laminated glass, the content (1) is preferably more than the content (2).

[0186] The absolute value of the difference between the content (2) and the content (1) is preferably 10 parts by weight or more, more preferably 15 parts by weight or more, further preferably 20 parts by weight or more, and is preferably 80 parts by weight or less, more preferably 75 parts by weight or less, further preferably 70 parts by weight or less, from the viewpoint of further improving the sound insulation of the laminated glass.

[0187] (Thermal insulation substance)

[0188] The intermediate film preferably contains a thermal insulation substance. The first resin layer preferably contains a thermal insulation substance. The second resin layer preferably contains a thermal insulation substance. The thermal insulation substance can be used singly or in combination of two or more.

[0189] The thermal insulation substance preferably contains at least one component X of a phthalocyanine compound, a naphthalocyanine compound, and an anthracyanine compound, or contains a thermal insulation particle. In this case, the thermal insulation substance can contain both the component X and the thermal insulation particle.

[0190] Component X:

[0191] The intermediate film preferably contains at least one component X of a phthalocyanine compound, a naphthalocyanine compound, and an anthracyanine compound. The first resin layer preferably contains the component X. The second resin layer preferably contains the component X. The component X is a thermal insulation substance. The component X can be used singly or in combination of two or more.

[0192] The component X is not particularly limited. As the component X, publicly known phthalocyanine compounds, naphthalocyanine compounds, and anthracyanine compounds can be used.

[0193] As the component X, phthalocyanine, a derivative of phthalocyanine, naphthalocyanine, a derivative of naphthalocyanine, anthracyanine, and a derivative of anthracyanine can be mentioned. The phthalocyanine compound and the derivative of phthalocyanine each preferably have a phthalocyanine skeleton. The naphthalocyanine compound and the derivative of naphthalocyanine each preferably have a naphthalocyanine skeleton. The anthracyanine compound and the derivative of anthracyanine each preferably have an anthracyanine skeleton.

[0194] From the viewpoint of further improving the thermal insulation of the intermediate film and the laminated glass, the component X is preferably at least one selected from the group consisting of phthalocyanine, a derivative of phthalocyanine, naphthalocyanine, and a derivative of naphthalocyanine, and is more preferably at least one selected from the group consisting of phthalocyanine and a derivative of phthalocyanine.

[0195] The component X preferably contains a vanadium atom or a copper atom from the viewpoint of effectively improving the heat shielding property and maintaining the visible light transmittance at a higher level for a long period of time. The component X preferably contains a vanadium atom and also preferably contains a copper atom. The component X is more preferably at least one selected from the group consisting of a phthalocyanine containing a vanadium atom or a copper atom and a derivative of a phthalocyanine containing a vanadium atom or a copper atom. The component X preferably has a structural unit in which an oxygen atom is bonded to a vanadium atom from the viewpoint of further improving the heat shielding property of the interlayer film and the laminated glass.

[0196] The content of the component X in the interlayer film 100 or in the layer (the first resin layer or the second resin layer) containing the component X is preferably 0.001% by weight or more, more preferably 0.005% by weight or more, further preferably 0.01% by weight or more, and particularly preferably 0.02% by weight or more. The content of the component X in the interlayer film 100 or in the layer (the first resin layer or the second resin layer) containing the component X is preferably 0.2% by weight or less, more preferably 0.1% by weight or less, further preferably 0.05% by weight or less, and particularly preferably 0.04% by weight or less. When the content of the component X is the lower limit or more and the upper limit or less, the heat shielding property is sufficiently high, and the visible light transmittance is sufficiently high. For example, the visible light transmittance can be 70% or more.

[0197] Heat shielding particles:

[0198] The interlayer film preferably contains heat shielding particles. The first resin layer preferably contains the heat shielding particles. The second resin layer preferably contains the heat shielding particles. The heat shielding particles are a heat shielding substance. By using the heat shielding particles, infrared rays (heat rays) can be effectively blocked. One kind of the heat shielding particles can be used alone, or two or more kinds of the heat shielding particles can be used in combination.

[0199] The heat shielding particles are more preferably metal oxide particles from the viewpoint of further improving the heat shielding property of the laminated glass. The heat shielding particles are preferably particles formed of a metal oxide (metal oxide particles).

[0200] The energy of infrared rays (wavelength: 780 nm or more) which are longer in wavelength than visible light is smaller than that of ultraviolet rays. However, the infrared rays have a large thermal effect, and when the infrared rays are absorbed by a substance, the infrared rays are released in the form of heat. Therefore, the infrared rays are generally referred to as heat rays. By using the heat shielding particles, infrared rays (heat rays) can be effectively blocked. Note that the heat shielding particles refer to particles capable of absorbing infrared rays.

[0201] As the heat shielding particles, there can be mentioned aluminum-doped tin oxide particles, indium-doped tin oxide particles, antimony-doped tin oxide particles (ATO particles), gallium-doped zinc oxide particles (GZO particles), indium-doped zinc oxide particles (IZO particles), aluminum-doped zinc oxide particles (AZO particles), niobium-doped titanium oxide particles, tungsten oxide particles, tin-doped indium oxide particles (ITO particles), tin-doped zinc oxide particles, silicon-doped zinc oxide particles and the like metal oxide particles, and lanthanum hexaboride (LaB6) particles and the like. As the heat shielding particles, heat shielding particles other than these can also be used. In terms of a higher shielding function of heat rays, the heat shielding particles are preferably metal oxide particles, more preferably ATO particles, GZO particles, IZO particles, ITO particles or tungsten oxide particles. In particular, in terms of a higher shielding function of heat rays and easy availability, the heat shielding particles are preferably ITO particles or tungsten oxide particles.

[0202] From the viewpoint of further improving the heat shielding properties of the interlayer film and the laminated glass, the tungsten oxide particles are preferably metal-doped tungsten oxide particles. Among the "tungsten oxide particles", metal-doped tungsten oxide particles are included. As the metal-doped tungsten oxide particles, there can be mentioned sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, rubidium-doped tungsten oxide particles and the like.

[0203] From the viewpoint of further improving the heat shielding properties of the interlayer film and the laminated glass, cesium-doped tungsten oxide particles are particularly preferred. From the viewpoint of further improving the heat shielding properties of the interlayer film and the laminated glass, the cesium-doped tungsten oxide particles are preferably tungsten oxide particles represented by the formula: Cs 0.33 WO3.

[0204] The average particle diameter of the heat shielding particles is preferably 0.01 μm or more, more preferably 0.02 μm or more, and is preferably 0.1 μm or less, more preferably 0.05 μm or less. When the average particle diameter is the lower limit or more, the shielding property of heat rays becomes sufficiently high. When the average particle diameter is the upper limit or less, the dispersibility of the heat shielding particles becomes high.

[0205] The "average particle diameter" means the volume average particle diameter. The average particle diameter can be measured using a particle size distribution measuring device ("UPA-EX150" manufactured by Nikkiso Co., Ltd.) or the like.

[0206] The content of the heat shielding particles (particularly, the content of tungsten oxide particles) in the intermediate film 100 or the layer containing the heat shielding particles (the first resin layer or the second resin layer) 100 is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, further preferably 1% by weight or more, particularly preferably 1.5% by weight or more. The content of the heat shielding particles (particularly, the content of tungsten oxide particles) in the intermediate film 100 or the layer containing the heat shielding particles (the first resin layer or the second resin layer) 100 is preferably 6% by weight or less, more preferably 5.5% by weight or less, further preferably 4% by weight or less, particularly preferably 3.5% by weight or less, most preferably 3% by weight or less. When the content of the heat shielding particles is the lower limit or more and the upper limit or less, the heat shielding property sufficiently becomes high, and the visible light transmittance sufficiently becomes high.

[0207] (metal salt)

[0208] The intermediate film preferably contains at least one metal salt (hereinafter sometimes referred to as metal salt M) of an alkali metal salt and an alkaline earth metal salt. The first resin layer preferably contains the metal salt M. The second resin layer preferably contains the metal salt M. Note that the alkaline earth metal refers to Be, Mg, Ca, Sr, Ba, and Ra. By using the metal salt M, it becomes easy to control the adhesion between the intermediate film and a glass plate or the like, or the adhesion between the layers in the intermediate film. The metal salt M can be used singly or in combination of two or more.

[0209] The metal salt M preferably contains at least one metal selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, and Ba. The metal salt contained in the intermediate film preferably contains at least one metal selected from the group consisting of K and Mg.

[0210] Further, as the metal salt M, an alkali metal salt of an organic acid having 2 to 16 carbon atoms and an alkaline earth metal salt of an organic acid having 2 to 16 carbon atoms can be used. The metal salt M can include a magnesium salt of a carboxylic acid having 2 to 16 carbon atoms or a potassium salt of a carboxylic acid having 2 to 16 carbon atoms.

[0211] As the magnesium salt of a carboxylic acid having 2 to 16 carbon atoms and the potassium salt of a carboxylic acid having 2 to 16 carbon atoms, there can be mentioned magnesium acetate, potassium acetate, magnesium propionate, potassium propionate, magnesium 2-ethylbutyrate, potassium 2-ethylbutyrate, magnesium 2-ethylhexanoate, and potassium 2-ethylhexanoate, and the like.

[0212] The total content of Mg and K in the interlayer film containing the metal salt M or the layer (the first resin layer or the second resin layer) containing the metal salt M is preferably 5 ppm or more, more preferably 10 ppm or more, and further preferably 20 ppm or more, and is preferably 300 ppm or less, more preferably 250 ppm or less, and further preferably 200 ppm or less. When the total content of Mg and K is the lower limit or more and the upper limit or less, the adhesion between the interlayer film and the glass plate or the adhesion between the layers in the interlayer film can be further favorably controlled.

[0213] (Ultraviolet shielding agent)

[0214] The interlayer film preferably contains an ultraviolet shielding agent. The first resin layer preferably contains an ultraviolet shielding agent. The second resin layer preferably contains an ultraviolet shielding agent. By using an ultraviolet shielding agent, the visible light transmittance does not easily become lower even if the interlayer film and the laminated glass are used for a long time. The ultraviolet shielding agent can be used alone or in combination with two or more kinds.

[0215] The ultraviolet shielding agent contains an ultraviolet absorber. The ultraviolet shielding agent is preferably an ultraviolet absorber.

[0216] As the ultraviolet shielding agent, for example, a metal atom-containing ultraviolet shielding agent, a metal oxide-containing ultraviolet shielding agent, an ultraviolet shielding agent having a benzotriazole structure (benzotriazole compound), an ultraviolet shielding agent having a benzophenone structure (benzophenone compound), an ultraviolet shielding agent having a triazine structure (triazine compound), an ultraviolet shielding agent having a malonate structure (malonate compound), an ultraviolet shielding agent having an oxanilide structure (oxanilide compound), and an ultraviolet shielding agent having a benzoate structure (benzoate compound), and the like can be given.

[0217] As the metal atom-containing ultraviolet shielding agent, for example, a platinum particle, a particle in which the surface of a platinum particle is covered with silica, a palladium particle, and a particle in which the surface of a palladium particle is covered with silica, and the like can be given. The ultraviolet shielding agent is preferably not a heat shielding particle.

[0218] The ultraviolet shielding agent is preferably an ultraviolet shielding agent having a benzotriazole structure, an ultraviolet shielding agent having a benzophenone structure, an ultraviolet shielding agent having a triazine structure, or an ultraviolet shielding agent having a benzoate structure. The ultraviolet shielding agent is more preferably an ultraviolet shielding agent having a benzotriazole structure or an ultraviolet shielding agent having a benzophenone structure, and is further preferably an ultraviolet shielding agent having a benzotriazole structure.

[0219] Examples of the metal oxide-containing UV shielding agent include zinc oxide, titanium oxide, and cerium oxide. Furthermore, the surface of the metal oxide-containing UV shielding agent may be coated. Examples of the coating material for the surface of the metal oxide-containing UV shielding agent include insulating metal oxides, hydrolyzable organosilicon compounds, and polysiloxane compounds.

[0220] Examples of the insulating metal oxide include silicon dioxide, aluminum oxide, and zirconium oxide. The insulating metal oxide has a band gap energy of, for example, 5.0 eV or more.

[0221] Examples of the ultraviolet shielding agent having a benzotriazole structure include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole ("Tinuvin P" manufactured by BASF), 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole ("Tinuvin 320" manufactured by BASF), 2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole ("Tinuvin 326" manufactured by BASF), and 2-(2'-hydroxy-3',5'-di-pentylphenyl)benzotriazole ("Tinuvin 328" manufactured by BASF). In terms of excellent ultraviolet shielding performance, the ultraviolet shielding agent is preferably a benzotriazole structure containing a halogen atom, and more preferably a benzotriazole structure containing a chlorine atom.

[0222] Examples of the ultraviolet shielding agent having a benzophenone structure include octoxynone ("Chimassorb 81" manufactured by BASF).

[0223] Examples of the ultraviolet shielding agent having a triazine structure include "LA-F70" manufactured by ADEKA and 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol ("Tinuvin 1577FF" manufactured by BASF).

[0224] Examples of the ultraviolet shielding agent having a malonate structure include dimethyl 2-(p-methoxybenzylidene)malonate, tetraethyl 2,2-(1,4-phenylenedimethylene)bismalonate, and 2-(p-methoxybenzylidene)-bis(1,2,2,6,6-pentamethyl-4-piperidinyl)malonate.

[0225] Examples of commercially available products of the ultraviolet shielding agent having a malonate structure include Hostavin B-CAP, Hostavin PR-25, and Hostavin PR-31 (all manufactured by Clariant).

[0226] As the ultraviolet shielding agent having an oxanilide structure, oxalic acid diamide having an aryl group or the like substituted on a nitrogen atom, such as N-(2-ethylphenyl)-N'-(2-ethoxy-5-tert-butylphenyl) oxalic acid diamide, N-(2-ethylphenyl)-N'-(2-ethoxyphenyl) oxalic acid diamide, 2-ethyl-2'-ethoxy-oxanilide ("Sanduvor VSU" manufactured by Clariant Corporation), and the like can be given.

[0227] As the ultraviolet shielding agent having a benzoate structure, for example, 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate ("Tinuvin 120" manufactured by BASF Corporation), and the like can be given.

[0228] The content of the ultraviolet shielding agent and the content of the benzotriazole compound in the intermediate film 100% by weight or the layer (the first resin layer or the second resin layer) containing the ultraviolet shielding agent 100% by weight are preferably 0.1% by weight or more, more preferably 0.2% by weight or more, further preferably 0.3% by weight or more, and particularly preferably 0.5% by weight or more. In this case, the decrease in the visible light transmittance with the passage of time can be further suppressed. The content of the ultraviolet shielding agent and the content of the benzotriazole compound in the intermediate film 100% by weight or the layer (the first resin layer or the second resin layer) containing the ultraviolet shielding agent 100% by weight are preferably 2.5% by weight or less, more preferably 2% by weight or less, further preferably 1% by weight or less, and particularly preferably 0.8% by weight or less. In particular, in the layer containing the ultraviolet shielding agent 100% by weight, by making the content of the ultraviolet shielding agent 0.2% by weight or more, the decrease in the visible light transmittance of the intermediate film and the laminated glass with the passage of time can be significantly suppressed.

[0229] (Antioxidant)

[0230] The intermediate film preferably contains an antioxidant. The first resin layer preferably contains an antioxidant. The second resin layer preferably contains an antioxidant. The antioxidant can be used alone or two or more kinds can be used in combination.

[0231] As the antioxidant, a phenolic antioxidant, a sulfur antioxidant, a phosphorus antioxidant, and the like can be given. The phenolic antioxidant is an antioxidant having a phenol skeleton. The sulfur antioxidant is an antioxidant containing a sulfur atom. The phosphorus antioxidant is an antioxidant containing a phosphorus atom.

[0232] The antioxidant is preferably a phenolic antioxidant or a phosphorus antioxidant.

[0233] As the phenol-based antioxidant, 2, 6-di-tert-butyl-p-cresol (BHT), butylhydroxyanisole (BHA), 2, 6-di-tert-butyl-4-ethylphenol, β-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid stearyl ester, 2, 2'-methylenebis-(4-methyl-6- butylphenol), 2, 2'-methylenebis-(4-ethyl-6-tert-butylphenol), 4, 4'-butylidene-bis-(3- methyl-6-tert-butylphenol), 1, 1, 3-tris-(2-methyl-hydroxy-5-tert-butylphenyl) butane, tetra- methylene-3-(3', 5'-butyl-4-hydroxyphenyl) propionic acid ester] methane, 1, 3, 3-tris-(2- methyl-4-hydroxy-5-tert-butylphenyl) butane, 1, 3, 5-trimethyl-2, 4, 6-tris(3, 5-di-tert- butyl-4-hydroxybenzyl) benzene, bis(3, 3'-tert-butylphenol) butyric acid glycol ester, and bis(3-tert-butyl-4-hydroxy-5-methylbenzene propionic acid) ethylene bis(oxyethylene) ester, and the like can be mentioned. One or two or more of these antioxidants are suitably used.

[0234] As the phosphorus-based antioxidant, tridecyl phosphite, tris(tridecyl) phosphite, triphenyl phosphite, tris(nonylphenyl) phosphite, bis(tridecyl) pentaerythritol diphosphite, bis(decyl) pentaerythritol diphosphite, tris(2, 4-di-tert-butylphenyl) phosphite, bis(2, 4-di-tert-butyl-6- methylphenyl) ethyl phosphite, and 2, 2'-methylenebis(4, 6-di-tert-butyl-l-phenyloxy) (2- ethylhexyloxy) phosphorus, and the like can be mentioned. One or two or more of these antioxidants are suitably used.

[0235] As the commercially available product of the antioxidant, "IRGANOX 245" manufactured by BASF Co., "IRGAFOS 168" manufactured by BASF Co., "IRGAFOS 38" manufactured by BASF Co., "Sumilizer BHT" manufactured by Sumitomo Chemical Industries Co., "H-BHT" manufactured by Sakai Chemical Industry Co., and "IRGANOX 1010" manufactured by BASF Co., and the like can be mentioned.

[0236] In order to continuously maintain a high visible light transmittance of the interlayer film and the laminated glass for a long time, the content of the antioxidant is preferably 0.03% by weight or more, more preferably 0.1% by weight or more, in 100% by weight of the interlayer film 100 or in 100% by weight of the layer containing the antioxidant (the first resin layer or the second resin layer). Further, since the effect of the addition of the antioxidant is saturated, the content of the antioxidant is preferably 2% by weight or less, in 100% by weight of the interlayer film 100 or in 100% by weight of the layer containing the antioxidant.

[0237] (Other Components)

[0238] The intermediate film, the first resin layer, and the second resin layer can each contain, as needed, a coupling agent, a dispersing agent, a surfactant, a flame retardant, an antistatic agent, an adhesion adjuster other than a metal salt, a moisture resistance agent, a fluorescent brightener, an infrared absorber, and the like. These additives can be used singly or in combination of two or more.

[0239] (Details of the intermediate film for laminated glass)

[0240] The intermediate film can be wound to form a roll of intermediate film. The roll can have a core and the intermediate film wound around the outer periphery of the core.

[0241] The intermediate film preferably has a concavo-convex shape on at least one of the two side surfaces. The intermediate film more preferably has a concavo-convex shape on both side surfaces. As a method for forming the concavo-convex shape, there are no particular limitations, and examples include a lip embossing method (melt fracture method), a knurling roll method, a calender roll method, and a profile extrusion method.

[0242] The intermediate film preferably has a concavo-convex shape on the surface formed by a melt fracture method or a knurling roll method, and more preferably has a concavo-convex shape on the surface formed by a melt fracture method or a knurling roll method based on a line pressure of 0.10 kN / cm or less. By using the method, a concavo-convex shape can be favorably imparted even if the thickness of the surface layer is thin, and as a result, optical distortion can be effectively suppressed.

[0243] From the viewpoint of quantitatively forming a plurality of concavo-convex shapes as a specific concavo-convex pattern, the intermediate film preferably has a concavo-convex shape on the surface formed by a knurling roll method.

[0244] (Laminated glass)

[0245] The laminated glass of the present application has a first laminated glass member, a second laminated glass member, and the intermediate film for laminated glass. In the laminated glass of the present application, the intermediate film for laminated glass is disposed between the first laminated glass member and the second laminated glass member.

[0246] The laminated glass is, for example, a head-up display. In the case where the laminated glass is a head-up display, the laminated glass has a display region of the head-up display. The display region is a region in which information can be favorably displayed.

[0247] The laminated glass is preferably a head-up display (HUD).

[0248] The head-up display system can be obtained using the head-up display. The head-up display system is provided with the laminated glass and a light source device for irradiating the laminated glass with image display light. The light source device can be installed in a vehicle, for example, a dashboard. The image display can be performed by irradiating the display region of the laminated glass with light from the light source device.

[0249] FIG. 6 is a cross-sectional view schematically showing one example of a laminated glass using the intermediate film of the present application. Figure 1 FIG. 6 is a cross-sectional view schematically showing one example of a laminated glass using the intermediate film of the present application.

[0250] The laminated glass 20 shown in FIG. 6 is provided with a first laminated glass member 31, a second laminated glass member 32, and the intermediate film 10. The intermediate film 10 is disposed and interposed between the first laminated glass member 31 and the second laminated glass member 32. The first laminated glass member 31 is laminated on the first surface (one-side surface) of the intermediate film 10. The second laminated glass member 32 is laminated on the second surface (other-side surface) of the intermediate film 10 opposite to the first surface. The first laminated glass member 31 is laminated on the surface of the intermediate film 10 outside the second resin layer 21. The second laminated glass member 32 is laminated on the surface of the intermediate film 10 outside the second resin layer 23.

[0251] Thus, the laminated glass of the present application is provided with a first laminated glass member, a second laminated glass member, and an intermediate film, which is the intermediate film for laminated glass of the present application.

[0252] The first laminated glass member is preferably a first glass sheet. The second laminated glass member is preferably a second glass sheet.

[0253] As the first and second laminated glass members, glass sheets and PET (polyethylene terephthalate) films and the like can be given. The laminated glass includes not only laminated glass in which an intermediate film is interposed between two glass sheets, but also laminated glass in which an intermediate film is interposed between a glass sheet and a PET film or the like. The laminated glass is a laminate provided with a glass sheet, and preferably at least one glass sheet is used. The first laminated glass member and the second laminated glass member are each a glass sheet or a PET film, and the laminated glass preferably has a glass sheet as at least one of the first laminated glass member and the second laminated glass member. It is particularly preferable that both the first and second laminated glass members are glass sheets.

[0254] As the glass plate, inorganic glass and organic glass can be given. As the inorganic glass, float plate glass, heat ray absorbing plate glass, heat ray reflecting plate glass, polished plate glass, embossed plate glass, wired plate glass, and green glass, etc. can be given. The organic glass is a synthetic resin glass used in place of inorganic glass. As the organic glass, polycarbonate plate, poly(meth)acrylic resin plate, etc. can be given. As the poly(meth)acrylic resin plate, poly(methyl) methacrylate plate, etc. can be given.

[0255] Each thickness of the first and second laminated glass members is preferably 1 mm or more, preferably 5 mm or less, more preferably 3 mm or less. Further, in the case where the laminated glass member is a glass plate, the thickness of the glass plate is preferably 0.5 mm or more, more preferably 0.7 mm or more, preferably 5 mm or less, more preferably 3 mm or less. In the case where the laminated glass member is a PET film, the thickness of the PET film is preferably 0.03 mm or more, preferably 0.5 mm or less.

[0256] The method for producing the laminated glass is not particularly limited. First, the intermediate film is interposed between the first and second laminated glass members to obtain a laminate. Then, for example, the obtained laminate is subjected to reduced pressure suction by a press roll or by being put into a rubber bag, whereby air remaining between the first and second laminated glass members and the intermediate film can be discharged. Thereafter, the laminate subjected to pre-bonding is obtained by being subjected to bonding at about 70°C to 110°C. Then, the laminate subjected to pre-bonding is put into an autoclave or is subjected to pressing, and is subjected to bonding at about 120°C to 150°C under a pressure of about 1 MPa to 1.5 MPa. Thus, the laminated glass can be obtained.

[0257] The intermediate film and the laminated glass can be used for automobiles, railway vehicles, airplanes, ships, buildings, etc. The intermediate film and the laminated glass can be used for other uses. The intermediate film and the laminated glass are preferably intermediate films and laminated glasses for buildings or vehicles, more preferably intermediate films and laminated glasses for vehicles. The intermediate film and the laminated glass can be used for a windshield, a side glass, a rear glass, a sunroof glass, or a back light glass of an automobile, etc. The intermediate film and the laminated glass are suitable for automobiles. The intermediate film is suitable for obtaining a laminated glass for an automobile.

[0258] The following examples and comparative examples are given to explain the present application in more detail. The examples are not limited to the examples used in the present application.

[0259] In the polyvinyl acetal resin used, n-butyl aldehyde having 4 carbon atoms was used for acetalization. For the polyvinyl acetal resin, the degree of acetalization (degree of butyl acetalization), the degree of acetylation, and the hydroxyl content were determined by the method according to JIS K 6728 "Test method for polyvinyl butyral". Note that, when determined by ASTM D1396-92, the same values as those based on the method according to JIS K 6728 "Test method for polyvinyl butyral" were shown.

[0260] The following ingredients were compounded, and a composition Al to Cl for forming the first resin layer was prepared by sufficiently kneading with a mixing roll.

[0261] Composition Al for forming the first resin layer:

[0262] Polyvinyl acetal resin (average degree of polymerization 3000, hydroxyl content 23.8 mol%, degree of acetylation 12.4 mol%, degree of acetalization 63.8 mol%) 100 parts by weight

[0263] Triethylene glycol di-2-ethylhexanoate (3GO) 60 parts by weight

[0264] Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, manufactured by BASF Corporation "Tinuvin 326") in an amount of 0.2% by weight in the resulting first resin layer 100% by weight

[0265] BHT (2,6-di-tert-butyl-p-cresol) in an amount of 0.2% by weight in the resulting first resin layer 100% by weight

[0266] Composition Bl for forming the first resin layer:

[0267] Polyvinyl acetal resin (average degree of polymerization 2300, hydroxyl content 22.9 mol%, degree of acetylation 12.1 mol%, degree of acetalization 65 mol%) 100 parts by weight

[0268] Triethylene glycol di-2-ethylhexanoate (3GO) 60 parts by weight

[0269] Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, manufactured by BASF Corporation "Tinuvin 326") in an amount of 0.2% by weight in the resulting first resin layer 100% by weight

[0270] BHT (2,6-di-tert-butyl-p-cresol) in an amount of 0.2% by weight in the resulting first resin layer 100% by weight

[0271] Composition Cl for forming the first resin layer:

[0272] Polyvinyl acetal resin (average degree of polymerization 3000, hydroxyl content 26.5 mol%, acetylation degree 1 mol%, acetalization degree 72.5 mol%) 100 parts by weight

[0273] Triethylene glycol di-2-ethylhexanoate (3GO) 40 parts by weight

[0274] Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, manufactured by BASF Corporation "Tinuvin 326") in an amount of 0.2% by weight in 100% by weight of the obtained first resin layer

[0275] BHT (2,6-di-tert-butyl-p-cresol) in an amount of 0.2% by weight in 100% by weight of the obtained first resin layer

[0276] The following ingredients were combined, and a composition A2 to C2 for forming a second resin layer was prepared by sufficiently kneading with a mixing roll.

[0277] Composition A2 for forming a second resin layer:

[0278] Polyvinyl acetal resin (average degree of polymerization 1700, hydroxyl content 30.3 mol%, acetylation degree 0.9 mol%, acetalization degree 68.8 mol%) 100 parts by weight

[0279] Triethylene glycol di-2-ethylhexanoate (3GO) 40 parts by weight

[0280] Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, manufactured by BASF Corporation "Tinuvin 326") in an amount of 0.2% by weight in 100% by weight of the obtained second resin layer

[0281] BHT (2,6-di-tert-butyl-p-cresol) in an amount of 0.2% by weight in 100% by weight of the obtained second resin layer

[0282] Composition B2 for forming a second resin layer:

[0283] Polyvinyl acetal resin (average degree of polymerization 1700, hydroxyl content 24.7 mol%, acetylation degree 0.9 mol%, acetalization degree 74.4 mol%) 100 parts by weight

[0284] Triethylene glycol di-2-ethylhexanoate (3GO) 45 parts by weight

[0285] Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, manufactured by BASF Corporation, "Tinuvin 326") in an amount of 0.2% by weight in 100% by weight of the obtained second resin layer

[0286] BHT (2,6-di-tert-butyl-p-cresol) in an amount of 0.2% by weight in 100% by weight of the obtained second resin layer

[0287] Composition C2 for forming the second resin layer:

[0288] Polyvinyl acetal resin (average degree of polymerization 2300, hydroxyl content 24.2 mol%, acetylation degree 12.2 mol%, acetalization degree 63.6 mol%) 100 parts by weight

[0289] Triethylene glycol di-2-ethylhexanoate (3GO) 45 parts by weight

[0290] Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, manufactured by BASF Corporation, "Tinuvin 326") in an amount of 0.2% by weight in 100% by weight of the obtained second resin layer

[0291] BHT (2,6-di-tert-butyl-p-cresol) in an amount of 0.2% by weight in 100% by weight of the obtained second resin layer

[0292] (Comparative Example 1)

[0293] Preparation of the intermediate film:

[0294] Composition Al for forming the first resin layer and composition A2 for forming the second resin layer were co-extruded using a co-extruder, and the intermediate film was wound to obtain a roll. Thus, a wedge-shaped intermediate film having a 3-layered laminated structure of the second resin layer / first resin layer / second resin layer was prepared (the outer shape was as shown in Figure 1 ).

[0295] (Example 1)

[0296] Preparation of the intermediate film:

[0297] Composition Bl for forming the first resin layer and composition B2 for forming the second resin layer were co-extruded using a co-extruder, and the intermediate film was wound to obtain a roll. Thus, a wedge-shaped intermediate film having a 5-layered laminated structure of the second resin layer / first resin layer / second resin layer / first resin layer / second resin layer was prepared (the outer shape was as shown in Figure 1 ).

[0298] (Examples 2, 3 and Comparative Examples 2, 3)

[0299] The kind of the composition for forming the first resin layer, the kind of the composition for forming the second resin layer, the wedge angle and the thickness of the intermediate film were changed as described in Tables 1 to 2. Other than that, in the same manner as in Example 1, a wedge-shaped intermediate film having a 5-layered laminated structure of the second resin layer / first resin layer / second resin layer / first resin layer / second resin layer was prepared (the outer shape was as shown in Figure 1 ).

[0300] (Example 4)

[0301] The laminated order of the first resin layer and the second resin layer was changed, and other than that, in the same manner as in Example 1, a wedge-shaped intermediate film having a 5-layered laminated structure of the first resin layer / second resin layer / first resin layer / second resin layer / first resin layer was prepared (the outer shape was as shown in Figure 1 ).

[0302] (Comparative Example 4)

[0303] Composition A2 and B2 for forming the second resin layer were co-extruded using a co-extruder, and the intermediate film was wound to obtain a roll, and other than that, in the same manner as in Example 1, a wedge-shaped intermediate film having 5 layers of the second resin layer was prepared (the outer shape was as shown in Figure 1 ).

[0304] (Example 5)

[0305] Composition Bl for forming the first resin layer and composition B2 for forming the second resin layer were co-extruded using a co-extruder, and the intermediate film was wound to obtain a roll. Thereby, a wedge-shaped intermediate film having a 7-layered laminated structure in which the first resin layer and the second resin layer were alternately laminated in the thickness direction was prepared (the outer shape was as shown in Figure 1 , and the surface layer was the second resin layer).

[0306] (Example 6)

[0307] The kind of the composition for forming the first resin layer, the kind of the composition for forming the second resin layer, the laminated order of the first resin layer and the second resin layer, the wedge angle and the thickness of the intermediate film were changed as described in Tables 3 to 4. Other than that, in the same manner as in Example 5, a wedge-shaped intermediate film having a 7-layered laminated structure in which the first resin layer and the second resin layer were alternately laminated in the thickness direction was prepared (the outer shape was as shown in Figure 1 , and the surface layer was the first resin layer).

[0308] (Examples 7, 8)

[0309] The kind of the composition for forming the first resin layer, the kind of the composition for forming the second resin layer, the wedge angle and the thickness of the intermediate film were changed as described in Tables 3 to 4. Other than that, in the same manner as in Example 5, a wedge-shaped intermediate film having a 7-layered structure in which the first resin layer and the second resin layer were alternately stacked in the thickness direction (the outer shape was as shown in Figure 1 , and the surface layer was the second resin layer) was prepared.

[0310] (Example 9)

[0311] The composition Bl for forming the first resin layer and the composition B2 for forming the second resin layer were co-extruded using a co-extruder, and the intermediate film was wound to obtain a roll. Thus, a wedge-shaped intermediate film having a 9-layered structure in which the first resin layer and the second resin layer were alternately stacked in the thickness direction (the outer shape was as shown in Figure 1 , and the surface layer was the second resin layer) was prepared.

[0312] (Example 10)

[0313] The kind of the composition for forming the first resin layer, the kind of the composition for forming the second resin layer, the stacking order of the first resin layer and the second resin layer, the wedge angle and the thickness of the intermediate film were changed as described in Tables 5 to 6. Other than that, in the same manner as in Example 9, a wedge-shaped intermediate film having a 9-layered structure in which the first resin layer and the second resin layer were alternately stacked in the thickness direction (the outer shape was as shown in Figure 1 , and the surface layer was the first resin layer) was prepared.

[0314] (Example 11)

[0315] The kind of the composition for forming the first resin layer, the kind of the composition for forming the second resin layer, the wedge angle and the thickness of the intermediate film were changed as described in Tables 5 to 6. Other than that, in the same manner as in Example 9, a wedge-shaped intermediate film having a 9-layered structure in which the first resin layer and the second resin layer were alternately stacked in the thickness direction (the outer shape was as shown in Figure 1 , and the surface layer was the second resin layer) was prepared.

[0316] (Example 12)

[0317] The composition Bl for forming the first resin layer and the composition B2 for forming the second resin layer were co-extruded using a co-extruder, and the intermediate film was wound to obtain a roll. Thus, a wedge-shaped intermediate film having an 11-layered structure in which the first resin layer and the second resin layer were alternately stacked in the thickness direction (the outer shape was as shown in Figure 1 , and the surface layer was the second resin layer) was prepared.

[0318] (Example 13)

[0319] The kind of the composition for forming the first resin layer, the kind of the composition for forming the second resin layer, the lamination order of the first resin layer and the second resin layer, the wedge angle and the thickness of the interlayer film were changed as described in Tables 5 to 6. Other than that, in the same manner as in Example 12, a wedge-shaped interlayer film having a lamination structure in which the first resin layer and the second resin layer were alternately laminated in the thickness direction and having 11 layers was prepared (the outer shape was as shown in ​ , and the surface layer was the first resin layer).

[0320] (Examples 14 and 15)

[0321] The kind of the composition for forming the first resin layer, the kind of the composition for forming the second resin layer, the wedge angle and the thickness of the interlayer film were changed as described in Tables 7 to 8. Other than that, in the same manner as in Example 12, a wedge-shaped interlayer film having a lamination structure in which the first resin layer and the second resin layer were alternately laminated in the thickness direction and having 11 layers was prepared (the outer shape was as shown in ​ , and the surface layer was the second resin layer).

[0322] (Examples 16 to 18)

[0323] The wedge angle and the thickness of the interlayer film were changed as described in Tables 7 to 8. Other than that, in the same manner as in Example 3, a wedge-shaped interlayer film having a lamination structure in which the first resin layer and the second resin layer were alternately laminated in the thickness direction and having 5 layers was prepared (the surface layer was the second resin layer). In Examples 16 and 17, layers in which the thickness increase direction of the surface layer (Layer 1 and Layer 5) was opposite to the thickness increase direction of the entire interlayer film were constituted. In Example 8, layers in which the thickness increase direction of the surface layer (Layer 1 and Layer 5) and the core layer (Layer 3) was opposite to the thickness increase direction of the entire interlayer film were constituted.

[0324] (Evaluation)

[0325] (1) Glass transition temperature Tg

[0326] The interlayer film was stored in an environment of room temperature 23 ± 2°C and humidity 25 ± 5% for 12 hours. Subsequently, using a viscoelasticity measuring device "ARES-G2" manufactured by TA INSTRUMENTS, Inc., viscoelasticity was measured. Using a parallel plate having a diameter of 8 mm as a jig, measurement was performed in a shear mode, under conditions of a temperature decrease from 100°C to -20°C at a rate of 3°C / minute and a frequency of 1 Hz and a strain of 1%. In the obtained measurement results, the peak temperature of the tangent of the loss angle was set as the glass transition temperature Tg (°C). Thus, the glass transition temperature of the first resin layer and the second resin layer in the obtained interlayer film was calculated.

[0327] (2) Wedge angle and thickness of the interlayer film

[0328] The thickness of the intermediate film and the wedge angle of the intermediate film were measured by the method using a contact thickness meter "TOF-4R" (manufactured by YAMABUN ELECTRONICS). Further, the thickness of the first resin layer and the second resin layer were measured by the method using a microscope "SE-3000" (manufactured by SELMIC). Further, Y1 / Z, Y2 / X, Y4 / Y3, Y6 / Y5 and T2 / T1 were measured by the method, and the presence or absence of a region in which Y2 / X was 0.3 or less (region A) and a region in which T2 / T1 was 1 or more (region C) was investigated. Further, the average thickness of each surface layer in a region (region B) from a position 100 mm from one end of the intermediate film toward a position 400 mm from the other end was calculated.

[0329] (3) Core detachment

[0330] The obtained intermediate film was wound on the outside of the core in such a manner that the one end of the intermediate film was 10 mm away from the end of the core to obtain a roll. The obtained intermediate film was vertically placed on a floor at room temperature of 15°C in such a manner that the other end side of the intermediate film was the upper surface, a load of 70 kg was applied to the upper surface of the roll, and it was observed whether the one end of the intermediate film contacted the floor, and the core detachment was determined.

[0331] [Criteria for determination of core detachment]

[0332] O: The one end of the roll did not contact the floor

[0333] X: The one end of the roll contacted the floor

[0334] (4) Maximum height of wrinkles

[0335] A 100 cm-long and 100 cm-wide (width of the roll) intermediate film was cut out from the obtained roll. The cut-out intermediate film was left to stand on a flat surface in an environment at 15°C. The maximum height of wrinkles generated in the end portion of the intermediate film after 24 hours from the start of the standing was measured.

[0336] [Criteria for determination of maximum height of wrinkles]

[0337] O: The maximum height of wrinkles was less than 4 cm

[0338] X: The maximum height of wrinkles was 4 cm or more

[0339] The constitution of the intermediate film and the results are shown in Tables 1 to 8 below.

[0340] The respective meanings of Y3, Y4, Y5 and Y6 in the table and the respective relationships below are as follows.

[0341] Y1 / Z: Y1 / Z when the thickness of the surface layer is Y1 μm and the thickness of the layer adjacent to the surface layer is Z μm

[0342] Y2 / X: Y2 / X when the thickness of the intermediate film is X μm and the thickness of the surface layer is Y2 μm

[0343] Y4 / Y3: Y4 / Y3 when the average thickness of the surface layer in the region from the position of 50 mm to the position of 150 mm from one end toward the other end is Y3 μm and the average thickness of the surface layer in the region from the position of 50 mm to the position of 150 mm from the other end toward one end is Y4 μm

[0344] Y6 / Y5: Y6 / Y5 when the average thickness of the layers other than the surface layer in the region from the position of 50 mm to the position of 150 mm from one end toward the other end is Y5 μm and the average thickness of the layers other than the surface layer in the region from the position of 50 mm to the position of 150 mm from the other end toward one end is Y6 μm

[0345] T2 / T1: T2 / T1 when the total thickness of the first resin layer is T1 μm and the total thickness of the second resin layer is T2 μm

[0346] [Table 1]

[0347]

[0348] [Table 2]

[0349]

[0350] [Table 3]

[0351]

[0352] [Table 4]

[0353]

[0354] [Table 5]

[0355]

[0356] [Table 6]

[0357]

[0358] [Table 7]

[0359]

[0360] [Table 8]

[0361]

[0362] Using the interlayer films obtained in Examples 1 to 15, laminated glasses were prepared, and as a result, in Examples 1 to 3 in which the surface layer was the second resin layer, the degassing property at the time of preparing the laminated glass was better than that of Example 4 in which the surface layer was the first resin layer. Further, in Examples 5, 7, and 8 in which the surface layer was the second resin layer, the degassing property at the time of preparing the laminated glass was better than that of Example 6 in which the surface layer was the first resin layer. Further, in Examples 9 and 11 in which the surface layer was the second resin layer, the degassing property at the time of preparing the laminated glass was better than that of Example 10 in which the surface layer was the first resin layer. Further, in Examples 12, 14, and 15 in which the surface layer was the second resin layer, the degassing property at the time of preparing the laminated glass was better than that of Example 13 in which the surface layer was the first resin layer. Further, in the laminated glasses prepared using the interlayer films of Examples 1 to 3, 5, 7 to 9, 11, 12, 14, and 15 in which the surface layer was the second resin layer, the optical distortion was suppressed compared to the laminated glasses prepared using the interlayer films of Examples 4, 6, 10, and 13 in which the surface layer was the first resin layer.

[0363] Explanation of symbols

[0364] 10, 10A, 10B, 10C... interlayer film

[0365] 10a... one end

[0366] 10b... other end

[0367] 11, 11A, 11B, 11C, 12, 12A, 12B, 12C... first resin layer

[0368] 20... laminated glass

[0369] 21, 21A, 21B, 21C, 22, 22A, 22B, 22C, 23, 23A, 23B, 23C... second resin layer

[0370] 31... first laminated glass part

[0371] 32... second laminated glass part

Claims

1. An interlayer for laminated glass having one end and another end located on the opposite side of the one end, the thickness of the one end is 1.05 mm or less, the interlayer is provided with a first resin layer having a glass transition temperature of less than 15°C and a second resin layer having a glass transition temperature of 15°C or more, the interlayer has a region in which the total number of layers of the first resin layer and the second resin layer in the thickness direction is 5 layers or more and 10 layers or less, in the region of 5 layers or more and 10 layers or less, when the thickness of the surface layer is Yl pm and the thickness of the layer adjacent to the surface layer is Z pm, Yl / Z is 3.67 or more and 6.19 or less, the thickness of the other end is greater than the thickness of the one end.

2. The interlayer for laminated glass according to claim 1, having: a region in which the first resin layer and the second resin layer are alternately stacked in the thickness direction.

3. The interlayer for laminated glass according to claim 1 or 2, wherein the surface layer is the second resin layer.

4. The interlayer for laminated glass according to claim 1 or 2, wherein the interlayer has a region in which Y2 / X is 0.3 or less, when the thickness of the interlayer is X pm and the thickness of the surface layer is Y2 pm.

5. The interlayer for laminated glass according to claim 1 or 2, wherein the average thickness of the surface layer in a region from a position 100 mm from the one end toward the other end to a position 400 mm therefrom is 300 pm or less.

6. The interlayer for laminated glass according to claim 1 or 2, wherein when the average thickness of the surface layer in a region from a position 50 mm from the one end toward the other end to a position 150 mm therefrom is Y3 pm and the average thickness of the surface layer in a region from a position 50 mm from the other end toward the one end to a position 150 mm therefrom is Y4 pm, Y4 / Y3 is 2.5 or less.

7. The interlayer for laminated glass according to claim 1 or 2, wherein when the average thickness of the layers other than the surface layer in a region from a position 50 mm from the one end toward the other end to a position 150 mm therefrom is Y5 pm and the average thickness of the layers other than the surface layer in a region from a position 50 mm from the other end toward the one end to a position 150 mm therefrom is Y6 pm, Y6 / Y5 is 2.5 or less.

8. The interlayer for laminated glass according to claim 1 or 2, having a display corresponding region corresponding to a display region of a head-up display, the average thickness of the surface layer in the display corresponding region is 300 pm or less.

9. The interlayer for laminated glass according to claim 1 or 2, wherein the interlayer has a region in which T2 / T1 is 1 or more, when the total thickness of the first resin layer is Tl pm and the total thickness of the second resin layer is T2 pm.

10. The interlayer for laminated glass according to claim 1 or 2, wherein An absolute value of a difference between the glass transition temperature of the first resin layer and the glass transition temperature of the second resin layer is 10°C or more and 65°C or less.

11. The interlayer for laminated glass according to claim 1 or 2, wherein The glass transition temperature of the first resin layer is -10°C or more.

12. The interlayer for laminated glass according to claim 1 or 2, wherein The glass transition temperature of the second resin layer is 40°C or less.

13. The interlayer for laminated glass according to claim 6, wherein The Y4 / Y3 is 0.3 or more and 2.0 or less.

14. The interlayer for laminated glass according to claim 6, wherein The Y4 / Y3 is 0.9 or more and 1.7 or less.

15. The interlayer for laminated glass according to claim 7, wherein The Y6 / Y5 is 0.3 or more and 2.0 or less.

16. The interlayer for laminated glass according to claim 7, wherein The Y6 / Y5 is 0.9 or more and 1.7 or less.

17. The interlayer for laminated glass according to claim 8, wherein The average thickness of the surface layer in the display corresponding region is 180 μm or more, respectively.

18. The interlayer for laminated glass according to claim 1 or 2, wherein The thickness of the one end of the interlayer is 0.4 mm or more.

19. The interlayer for laminated glass according to claim 1 or 2, wherein The wedge angle θ of the interlayer is 0.2 mrad or more and 0.7 mrad or less.

20. A laminated glass comprising: a first laminated glass member; a second laminated glass member; and the interlayer for laminated glass according to any one of claims 1 to 19, The interlayer for laminated glass is disposed between the first laminated glass member and the second laminated glass member.

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