Laminated glass interlayer, laminated glass, and vehicle

Abstract

Provided is a laminated glass interlayer capable of enhancing heat shielding properties and weather resistance, and also capable of reducing the color coordinate b* in laminated glass.　A laminated glass interlayer according to the present invention contains heat-shielding particles and an ultraviolet absorber, wherein: the content of the ultraviolet absorber is 0.650-2.60 wt% in 100 wt% of the interlayer; and when laminated glass X is obtained by arranging the interlayer between two sheets of clear glass conforming to JIS R3202:1996, the interlayer has a region R in which the solar transmittance Ts2100 of the laminated glass X is 62.5% or less and the color coordinate b* in the L*a*b* color system of the laminated glass X is 2.0 or less.

Description

Interlayer film for laminated glass, laminated glass and vehicle

[0001] The present invention relates to an interlayer film for laminated glass used to obtain laminated glass. The present invention also relates to laminated glass. The present invention also relates to a vehicle using the laminated glass.

[0002] Laminated glass is excellent in safety because it generates only a small amount of glass fragments even when broken by external impact. For this reason, laminated glass is widely used in automobiles, railway vehicles, aircraft, ships, buildings, etc. Laminated glass is manufactured by sandwiching an interlayer film between a pair of glass sheets.

[0003] In order to improve the heat-shielding property, an interlayer film containing heat-shielding particles is sometimes used (for example, Patent Document 1 below). Also, in order to suppress the transmission of ultraviolet rays, an interlayer film containing an ultraviolet absorber is sometimes used (for example, Patent Document 2 below).

[0004] JP 2014-114191 A

[0005] In laminated glass using an interlayer film containing heat-shielding particles, the heat-shielding properties of the laminated glass can be improved to a certain extent. In order to further improve the heat-shielding properties of the laminated glass, it is conceivable to increase the content of heat-shielding particles in the interlayer film. However, simply increasing the content of heat-shielding particles in the interlayer film will result in a decrease in the color coordinate b of the laminated glass. ＊ tends to become large.

[0006] By the way, laminated glass may be used together with a camera sensor. In this case, the light emitted from the camera sensor must pass through the laminated glass. However, the color coordinate b of the laminated glass ＊ If the difference is large, the light emitted from the camera sensor may not be transmitted well through the laminated glass.

[0007] Furthermore, laminated glass using an interlayer film containing an ultraviolet absorber may not be able to sufficiently improve the weather resistance of the laminated glass, and for example, the color tone of the laminated glass may change after long-term use.

[0008] The object of the present invention is to provide a laminated glass that can improve heat insulation and weather resistance and has a color coordinate b ＊ The present invention also provides an interlayer film for laminated glass that can improve heat insulation and weather resistance and can reduce the color coordinate b ＊ It is another object of the present invention to provide a laminated glass capable of reducing the thickness of a vehicle.

[0009] This specification discloses the following interlayer film for laminated glass, laminated glass, and vehicle.

[0010] Item 1. An interlayer film for laminated glass, comprising heat-shielding particles and an ultraviolet absorber, wherein the content of the ultraviolet absorber in 100% by weight of the interlayer film is 0.650% by weight or more and 2.60% by weight or less, and when the interlayer film is placed between two sheets of clear glass conforming to JIS R3202:1996 to obtain laminated glass X, the solar transmittance Ts2100 of the laminated glass X is 62.5% or less, and the L of the laminated glass X is 62.5% or less. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ An interlayer film for laminated glass having a region R in which R is 2.0 or less.

[0011] Item 2. The interlayer film for laminated glass according to Item 1, wherein the content of the heat-shielding particles is 0.05% by weight or more and 0.8% by weight or less, based on 100% by weight of the interlayer film.

[0012] Item 3. The interlayer film for laminated glass according to Item 1 or 2, wherein the ultraviolet absorber includes a compound U having at least one of the following configuration A, configuration B, and configuration C:

[0013] Structure A: A compound having a maximum absorption wavelength of 345 nm or more and 355 nm or less. Structure B: A compound having a transmittance of 82% or less at a wavelength of 380 nm and a transmittance of 93% or more at a wavelength of 400 nm. Structure C: A compound having a benzotriazole skeleton, and in which no halogen atoms are bonded to the carbon atoms constituting the benzotriazole skeleton.

[0014] Item 4. The interlayer film for laminated glass according to Item 3, wherein the compound U has at least two of the configuration A, the configuration B, and the configuration C.

[0015] Item 5. The interlayer film for laminated glass according to Item 3 or 4, wherein the compound U comprises the structure A, the structure B, and the structure C.

[0016] Item 6. The interlayer film for laminated glass according to any one of Items 1 to 5, wherein, when a weather resistance test is conducted in which the laminated glass X is irradiated with light having a wavelength of 300 nm or more and 400 nm or less for 500 hours, the color difference ΔE between the region R of the laminated glass X before the weather resistance test and the region R of the laminated glass X after the weather resistance test is 0.5 or less.

[0017] Item 7. The interlayer film for laminated glass according to any one of Items 1 to 6, wherein the ultraviolet absorber comprises 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)phenol or 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol.

[0018] Item 8. The interlayer film for laminated glass according to any one of Items 1 to 7, wherein the heat shielding particles include tin-doped indium oxide particles or tungsten oxide particles.

[0019] Item 9. The interlayer film for laminated glass according to any one of Items 1 to 8, which contains a thermoplastic resin.

[0020] Item 10. The interlayer film for laminated glass according to Item 9, wherein the thermoplastic resin includes a polyvinyl acetal resin.

[0021] Item 11. The interlayer film for laminated glass according to any one of Items 1 to 10, which contains a plasticizer.

[0022] Item 12. A laminated glass comprising a first laminated glass member, a second laminated glass member, and the interlayer film for laminated glass according to any one of Items 1 to 11, wherein the interlayer film is disposed between the first laminated glass member and the second laminated glass member.

[0023] Item 13. A laminated glass comprising a first laminated glass member, a second laminated glass member, and an interlayer film for laminated glass, wherein the interlayer film is disposed between the first laminated glass member and the second laminated glass member, the interlayer film contains heat-shielding particles and an ultraviolet absorber, and the content of the ultraviolet absorber in 100% by weight of the interlayer film is 0.650% by weight or more and 2.60% by weight or less, the solar transmittance Ts2100 of the laminated glass is 62.5% or less, and the L of the laminated glass is ＊ a ＊ b ＊ Color coordinate b in the color system ＊ The laminated glass has a region R in which R is 2.0 or less.

[0024] Item 14. A vehicle comprising: a vehicle body; the laminated glass according to Item 12 or 13; and a camera sensor, wherein the camera sensor is disposed at a position where light emitted from the camera sensor can pass through the region R.

[0025] Item 15. A vehicle including a vehicle body, laminated glass, and a camera sensor for irradiating the laminated glass with light so that the light passes through the laminated glass, the vehicle comprising the interlayer film for laminated glass according to any one of Items 1 to 10.

[0026] The interlayer film for laminated glass according to the present invention contains heat-shielding particles and an ultraviolet absorber. The content of the ultraviolet absorber in 100% by weight of the interlayer film according to the present invention is 0.650% by weight or more and 2.60% by weight or less. The interlayer film according to the present invention is placed between two sheets of clear glass conforming to JIS R3202:1996 to obtain laminated glass X. The interlayer film according to the present invention is used to obtain laminated glass X having a solar transmittance Ts2100 of 62.5% or less and an L of the laminated glass X. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ The interlayer film according to the present invention has the above-described structure, and therefore, in the laminated glass, it is possible to improve the heat insulating property and weather resistance, and the color coordinate b ＊ can be made smaller.

[0027] The laminated glass according to the present invention comprises a first laminated glass member, a second laminated glass member, and an interlayer film for laminated glass, with the interlayer film disposed between the first laminated glass member and the second laminated glass member. In the laminated glass according to the present invention, the interlayer film contains heat-shielding particles and an ultraviolet absorber, and the content of the ultraviolet absorber in 100% by weight of the interlayer film is 0.650% by weight or more and 2.60% by weight or less. The laminated glass according to the present invention has a solar transmittance Ts2100 of 62.5% or less and an L of the laminated glass. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ The laminated glass according to the present invention has the above-mentioned configuration, and therefore can improve the heat-shielding property and weather resistance, and has a color coordinate b ＊ can be made smaller.

[0028] Fig. 1 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 1. Fig. 3 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a second embodiment of the present invention. Fig. 4 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 3.

[0029] The present invention will be described in detail below. Hereinafter, in this specification, the interlayer film for laminated glass may be referred to as an "interlayer film".

[0030] The interlayer film according to the present invention contains heat-shielding particles and an ultraviolet absorber, and the content of the ultraviolet absorber in 100% by weight of the interlayer film is 0.650% by weight or more and 2.60% by weight or less.

[0031] The interlayer film according to the present invention is disposed between two sheets of clear glass conforming to JIS R3202:1996 to obtain a laminated glass X. The interlayer film according to the present invention is used to obtain a laminated glass X having a solar transmittance Ts2100 of 62.5% or less and a L of the laminated glass X. ＊ a ＊ b ＊Color coordinate b in the color system ＊ has a region R where is 2.0 or less.

[0032] That is, the interlayer film according to the present invention has a region R. The region R is a region where the solar transmittance Ts2100 of the laminated glass X is 62.5% or less and the L ＊ a ＊ b ＊ Color coordinate b in the color system ＊ The laminated glass X is obtained by disposing the interlayer film according to the present invention between two sheets of clear glass conforming to JIS R3202:1996.

[0033] The interlayer film according to the present invention has the above-mentioned configuration, and therefore, in the laminated glass, it is possible to improve the heat insulating property and weather resistance, and also to achieve a color coordinate b ＊ The interlayer film according to the present invention can improve the heat shielding property and weather resistance in the portion of the laminated glass corresponding to the region R, and can reduce the color coordinate b ＊ can be made smaller.

[0034] The laminated glass according to the present invention includes a first laminated glass member, a second laminated glass member, and an interlayer film for laminated glass, the interlayer film being disposed between the first laminated glass member and the second laminated glass member. In the laminated glass according to the present invention, the interlayer film contains heat-shielding particles and an ultraviolet absorber, and the content of the ultraviolet absorber in 100% by weight of the interlayer film is 0.650% by weight or more and 2.60% by weight or less.

[0035] The laminated glass according to the present invention has a solar transmittance Ts2100 of 62.5% or less, and ＊ a ＊ b ＊ Color coordinate b in the color system ＊ has a region R where is 2.0 or less.

[0036] That is, the laminated glass according to the present invention has a region R. The region R is a region in which the solar transmittance Ts2100 of the laminated glass is 62.5% or less and the L ＊ a＊ b ＊ Color coordinate b in the color system ＊ is a region where is 2.0 or less.

[0037] The laminated glass according to the present invention has the above-mentioned configuration, and therefore can improve the heat insulating property and weather resistance, and can achieve a color coordinate b ＊ In the laminated glass according to the present invention, the heat shielding property and weather resistance can be improved in the region R, and the color coordinate b ＊ can be made smaller.

[0038] In the present invention, the solar transmittance Ts2100 and L of the laminated glass X produced using the interlayer film of the present invention and the laminated glass of the present invention (hereinafter sometimes referred to as "laminated glass Y") are ＊ a ＊ b ＊ Color coordinate b in the color system ＊ is measured.

[0039] The interlayer film according to the present invention may be used with two laminated glass components other than clear glass conforming to JIS R3202:1996 to produce laminated glass (e.g., a product), or the interlayer film may be used with a laminated glass component other than clear glass to produce laminated glass (e.g., a product). The interlayer film according to the present invention may be used with two clear glass components conforming to JIS R3202:1996 to produce laminated glass (e.g., a product). The interlayer film according to the present invention may be used with one clear glass component conforming to JIS R3202:1996 and one laminated glass component other than clear glass conforming to JIS R3202:1996 to produce laminated glass (e.g., a product).

[0040] That is, when producing laminated glass (e.g., a product) using the interlayer film of the present invention, laminated glass components other than two sheets of clear glass conforming to JIS R3202:1996 may be used, or laminated glass components other than clear glass may be used. Furthermore, when producing laminated glass (e.g., a product) using the interlayer film of the present invention, two sheets of clear glass conforming to JIS R3202:1996 may be used. Furthermore, when producing laminated glass (e.g., a product) using the interlayer film of the present invention, one sheet of clear glass conforming to JIS R3202:1996 and one sheet of laminated glass component other than clear glass conforming to JIS R3202:1996 may be used.

[0041] The solar transmittance Ts2100 of the laminated glass X and the laminated glass Y is determined by measuring the transmittance at a wavelength of 300 nm or more and 2100 nm or less using a spectrophotometer (for example, "U-4150" manufactured by Hitachi High-Technologies Corporation) in accordance with JIS R3106:1998.

[0042] The laminated glass X and the laminated glass Y ＊ a ＊ b ＊ Color coordinate b in the color system ＊ is measured in accordance with JIS Z8781-4:2013.

[0043] The laminated glass X is produced by placing the interlayer film between two clear glass sheets conforming to JIS R3202:1996. Each clear glass sheet has a thickness of 2 mm. The laminated glass X is preferably produced as follows.

[0044] A laminate is obtained by sandwiching an interlayer between two 2 mm thick clear glass sheets conforming to JIS R3202:1996. The obtained laminate is placed in a rubber bag and degassed at a vacuum of 2.6 kPa for 20 minutes. The degassed laminate is then transferred to an oven and vacuum-pressed at 90°C for 30 minutes to pre-bond the laminate. The pre-bonded laminate is then compressed in an autoclave at 135°C and a pressure of 1.2 MPa for 20 minutes to obtain laminated glass X.

[0045] The interlayer film according to the present invention is a glass having a solar transmittance Ts2100 of 62.5% or less and a L of the laminated glass X. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ has a region R where is 2.0 or less.

[0046] The laminated glass Y according to the present invention has a solar transmittance Ts2100 of 62.5% or less, and the L of the laminated glass Y is ＊ a ＊ b ＊ Color coordinate b in the color system ＊ has a region R where is 2.0 or less.

[0047] In the region R of the interlayer film, the solar transmittance Ts2100 of the laminated glass X (hereinafter sometimes referred to as solar transmittance Ts2100(X)) is 62.5% or less, preferably 62.0% or less, more preferably 61.0% or less, and even more preferably 60.5% or less. When the solar transmittance Ts2100(X) is equal to or less than the upper limit, the heat-shielding properties of the laminated glass can be further improved. In the region R of the interlayer film, the solar transmittance Ts2100(X) of the laminated glass X may be 56.0% or more, 57.0% or more, 58.0% or more, or 59.0% or more. The range of the solar transmittance Ts2100(X) of the laminated glass X can be set by appropriately selecting the lower limit and the upper limit.

[0048] In the region R of the laminated glass Y, the solar transmittance Ts2100 of the laminated glass Y (hereinafter sometimes referred to as solar transmittance Ts2100(Y)) is 62.5% or less, preferably 62.0% or less, more preferably 61.0% or less, and even more preferably 60.5% or less. When the solar transmittance Ts2100(Y) is equal to or less than the upper limit, the heat-shielding properties of the laminated glass Y can be further improved. In the region R of the laminated glass Y, the solar transmittance Ts2100(Y) of the laminated glass Y may be 56.0% or more, 57.0% or more, 58.0% or more, or 59.0% or more. The range of the solar transmittance Ts2100(Y) of the laminated glass Y can be set by appropriately selecting the lower limit and the upper limit.

[0049] In the region R of the interlayer film, the L of the laminated glass X ＊ a ＊ b ＊ Color coordinate b in the color system ＊ (Hereinafter, color coordinate b ＊ (X)) is 2.0 or less, preferably 1.8 or less, more preferably 1.6 or less, and even more preferably 1.5 or less. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ (X) may be 0 or more, 0.5 or more, 1.0 or more, 1.2 or more, or 1.3 or more. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ The range of (X) can be set by appropriately selecting the above lower limit and upper limit.

[0050] In the region R of the laminated glass Y, the L ＊ a ＊ b ＊ Color coordinate b in the color system ＊ (Hereinafter, color coordinate b ＊(Y)) is 2.0 or less, preferably 1.8 or less, more preferably 1.6 or less, and even more preferably 1.5 or less. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ (Y) may be 0 or more, 0.5 or more, 1.0 or more, 1.2 or more, or 1.3 or more. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ The range of (Y) can be set by appropriately selecting the above lower limit and upper limit.

[0051] When the laminated glass X is subjected to a weathering test in which light having a wavelength of 300 nm or more and 400 nm or less is irradiated for 500 hours, the color difference ΔE (hereinafter sometimes referred to as color difference ΔE(X)) between the region R of the laminated glass X before the weathering test and the region R of the laminated glass X after the weathering test is preferably 0.5 or less, more preferably 0.4 or less, and even more preferably 0.3 or less. When the color difference ΔE(X) is equal to or less than the upper limit, the weathering resistance of the laminated glass can be further improved. The color difference ΔE(X) may be 0 or more, 0.1 or more, or 0.2 or more. More specifically, the region R of the laminated glass X is the region corresponding to the region R of the laminated glass X. The range of the color difference ΔE(X) can be set by appropriately selecting the lower limit and the upper limit.

[0052] When the laminated glass Y is subjected to a weathering test in which light having a wavelength of 300 nm or more and 400 nm or less is irradiated for 500 hours, the color difference ΔE (hereinafter sometimes referred to as color difference ΔE(Y)) between the region R of the laminated glass Y before the weathering test and the region R of the laminated glass Y after the weathering test is preferably 0.5 or less, more preferably 0.4 or less, and even more preferably 0.3 or less. When the color difference ΔE(Y) is equal to or less than the upper limit, the weathering resistance of the laminated glass can be further improved. The color difference ΔE(Y) may be 0 or more, 0.1 or more, or 0.2 or more. The range of the color difference ΔE(Y) can be set by appropriately selecting the lower limit and the upper limit.

[0053] More specifically, the weather resistance test is carried out as follows. A laminated glass (laminated glass X, Y) is placed in a weather resistance tester (for example, "SX75" manufactured by Suga Test Instruments) so that the first surface of the laminated glass faces the light source (xenon lamp) and the distance between the first surface of the laminated glass and the light source is 260 mm to 270 mm. The laminated glass is fixed to a sample fixture so that one end of the laminated glass is exposed. An irradiance of 60 W / m2 is applied to the first surface of the fixed laminated glass. ２ Xenon light (irradiance measurement wavelength: 300 nm to 400 nm) is irradiated for 500 hours under the conditions of a black panel temperature of 63° C., a chamber temperature of 50° C., and a humidity of 50% RH.

[0054] The color difference ΔE is measured in accordance with JIS Z8781-4:2013. ＊ a ＊ b ＊ Color coordinate a in the color system ＊ , color coordinate b ＊ and lightness L ＊ It is calculated from

[0055] The planar area of ​​the region R, relative to 100% of the total planar area of ​​the interlayer film, is preferably 2.5% or more, more preferably 10% or more, even more preferably 20% or more, even more preferably 50% or more, even more preferably 60% or more, and particularly preferably 70% or more. When the planar area of ​​the region R is equal to or greater than the above lower limit, the effects of the present invention can be more effectively exhibited. The planar area of ​​the region R, relative to 100% of the total planar area of ​​the interlayer film, may be 100%, 100% or less, less than 100%, 99% or less, 95% or less, or 90% or less. The range of the planar area of ​​the region R, relative to 100% of the total planar area of ​​the interlayer film, can be set by appropriately selecting the above lower limit and upper limit.

[0056] The planar area of ​​the region R, relative to 100% of the total planar area of ​​the laminated glass Y, is preferably 2.5% or more, more preferably 10% or more, even more preferably 20% or more, even more preferably 50% or more, even more preferably 60% or more, and particularly preferably 70% or more. When the planar area of ​​the region R is equal to or greater than the above-mentioned lower limit, the effects of the present invention can be more effectively exhibited. The planar area of ​​the region R, relative to 100% of the total planar area of ​​the laminated glass Y, may be 100%, 100% or less, less than 100%, 99% or less, 95% or less, or 90% or less. The range of the planar area of ​​the region R, relative to 100% of the total planar area of ​​the laminated glass Y, can be set by appropriately selecting the above-mentioned lower limit and upper limit.

[0057] The interlayer film of the present invention may have only the region R. The interlayer film of the present invention may have a region S different from the region R. The interlayer film of the present invention may have both the region R and the region S. In the interlayer film, the region S is formed when the solar transmittance Ts2100 of the laminated glass X exceeds 62.5% or when the solar transmittance Ts2100 of the laminated glass X exceeds 62.5%. ＊ a ＊ b ＊ Color coordinate b in the color system ＊Therefore, the interlayer film according to the present invention is a glass having a solar transmittance Ts2100 of the laminated glass X exceeding 62.5% or a L ＊ a ＊ b ＊ Color coordinate b in the color system ＊ may have a region S in which S exceeds 2.0.

[0058] The planar area of ​​the region S, relative to 100% of the total planar area of ​​the interlayer film, is preferably 97.5% or less, more preferably 90% or less, even more preferably 80% or less, even more preferably 50% or less, even more preferably 40% or less, and particularly preferably 30% or less. The planar area of ​​the region S, relative to 100% of the total planar area of ​​the interlayer film, may be 0%, 0% or more, more than 0%, 1% or more, 5% or more, or 10% or more. The range of the planar area of ​​the region S, relative to 100% of the total planar area of ​​the interlayer film, can be set by appropriately selecting the lower limit and the upper limit.

[0059] The laminated glass Y of the present invention may have only the region R. The laminated glass Y of the present invention may have a region S different from the region R. The laminated glass Y of the present invention may have both the region R and the region S. In the laminated glass Y, the region S is formed when the solar transmittance Ts2100 of the laminated glass Y exceeds 62.5% or the L of the laminated glass Y exceeds 62.5%. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ Therefore, the laminated glass Y according to the present invention has a solar transmittance Ts2100 of more than 62.5%, or the L ＊ a ＊ b ＊ Color coordinate b in the color system ＊ may have a region S in which S exceeds 2.0.

[0060] The planar area of ​​the region S, relative to 100% of the total planar area of ​​the laminated glass Y, is preferably 97.5% or less, more preferably 90% or less, even more preferably 80% or less, even more preferably 50% or less, still more preferably 40% or less, and particularly preferably 30% or less. The planar area of ​​the region S, relative to 100% of the total planar area of ​​the laminated glass Y, may be 0%, 0% or more, more than 0%, more than 0%, 1% or more, 5% or more, or 10% or more. The range of the planar area of ​​the region S, relative to 100% of the total planar area of ​​the laminated glass Y, can be set by appropriately selecting the lower limit and the upper limit.

[0061] From the viewpoint of further enhancing the heat shielding properties of the laminated glass, it is preferable that the interlayer film according to the present invention does not have any region where the solar transmittance Ts2100 of the laminated glass X exceeds 62.5%. Furthermore, from the viewpoint of further enhancing the heat shielding properties of the laminated glass, it is preferable that the laminated glass Y according to the present invention does not have any region where the solar transmittance Ts2100 of the laminated glass Y exceeds 62.5%.

[0062] The interlayer film according to the present invention is the same as that of the laminated glass X. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ The laminated glass Y according to the present invention may or may not have a region where the L of the laminated glass Y is greater than 2.0. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ For example, when the interlayer film has a layer containing a colorant (colored layer), the L of the laminated glasses X and Y is preferably 2.0 or less in the region where the colored layer is present. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ In addition, for example, when a layer containing a relatively large amount of heat-shielding particles is embedded in the interlayer film, the L of the laminated glasses X and Y in the region where the layer is present is ＊ a ＊ b＊ Color coordinate b in the color system ＊ is often greater than 2.0. Therefore, when a colored layer or a layer containing a relatively large amount of heat-shielding particles is embedded in the interlayer film, the interlayer film or the laminated glass Y including the interlayer film often has the above-mentioned region S.

[0063] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

[0064] Fig. 1 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 1.

[0065] FIG. 1 is a cross-sectional view of an interlayer film 11 taken along its thickness direction. The interlayer film 11 includes a first layer 1, a second layer 2, and a third layer 3. The interlayer film 11 has a three-layer structure. The second layer 2 is disposed on the first surface 1a side of the first layer 1 and is laminated thereon. The third layer 3 is disposed on the second surface 1b side of the first layer 1, opposite the first surface 1a, and is laminated thereon. The second layer 2 and the third layer 3 are each protective layers, and in this embodiment, are surface layers. The first layer 1 is disposed between the second layer 2 and the third layer 3 and is sandwiched therebetween. Thus, the interlayer film 11 has a multilayer structure (second layer 2 / first layer 1 / third layer 3) in which the second layer 2, first layer 1, and third layer 3 are laminated in this order.

[0066] The second layer contains heat-shielding particles and an ultraviolet absorber. The third layer contains heat-shielding particles and an ultraviolet absorber. The interlayer film 11 has a first end (one end) and a second end (the other end). In the interlayer film 11, the first end and the second end are opposite ends. In the interlayer film 11, the region from the first end to the second end is region R. In the interlayer film 11, the region between the first end and the second end is region R. The planar area of ​​the region R is 100% of the total planar area of ​​the interlayer film 11, which is 100%.

[0067] 2 is a cross-sectional view taken along the thickness direction of laminated glass 31. The laminated glass 31 includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11. The interlayer film 11 is disposed between the first laminated glass member 21 and the second laminated glass member 22. The first laminated glass member 21 is disposed and laminated on a first surface side of the interlayer film 11. The second laminated glass member 22 is disposed and laminated on a second surface side of the interlayer film 11 opposite the first surface.

[0068] The laminated glass 31 has a first end (one end) and a second end (the other end). In the laminated glass 31, the first end and the second end are opposite ends. In the laminated glass 31, the region from the first end to the second end is region R. In the laminated glass 31, the region between the first end and the second end is region R. The plane area of ​​the region R is 100% of the total plane area of ​​the laminated glass 31, which is 100%.

[0069] Fig. 3 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a second embodiment of the present invention. Fig. 4 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 3.

[0070] 3 is a cross-sectional view of the interlayer film 11A taken along the thickness direction. The interlayer film 11A is a single-layer interlayer film having a one-layer structure. The interlayer film 11A is a first layer. The interlayer film 11A contains heat-shielding particles and an ultraviolet absorber.

[0071] The intermediate film 11A has a first end (one end) and a second end (the other end). In the intermediate film 11A, the first end and the second end are opposite ends. In the intermediate film 11A, the region from the first end to the second end is region R. In the intermediate film 11A, the region between the first end and the second end is region R. The planar area of ​​the above-mentioned region R is 100% of the total planar area of ​​the intermediate film 11A, which is 100%.

[0072] 4 is a cross-sectional view of laminated glass 31A taken along the thickness direction. The laminated glass 31A includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11A. The interlayer film 11A is disposed between the first laminated glass member 21 and the second laminated glass member 22. The first laminated glass member 21 is disposed and laminated on a first surface side of the interlayer film 11A. The second laminated glass member 22 is disposed and laminated on a second surface side of the interlayer film 11A opposite to the first surface.

[0073] The laminated glass 31A has a first end (one end) and a second end (the other end). In the laminated glass 31A, the first end and the second end are opposite ends. In the laminated glass 31A, the region from the first end to the second end is region R. In the laminated glass 31A, the region between the first end and the second end is region R. The planar area of ​​the region R is 100% of the total planar area of ​​the laminated glass 31A (100%).

[0074] It should be noted that, out of the total planar area of ​​the interlayer films 11, 11A and the laminated glasses 31, 31A, which is 100%, the planar area of ​​the region R is 100%, but the value of the planar area of ​​the region R can be changed.

[0075] Other details of the interlayer film and the components constituting the laminated glass will be described below.

[0076] (Interlayer film for laminated glass) The interlayer film has a single-layer structure or a two or more-layer structure. The interlayer film may have a single-layer structure, or a two or more-layer structure. The interlayer film may have a two-layer structure, a two or more-layer structure, a three-layer structure, or a three or more-layer structure. The interlayer film may have a structure of 10 or less layers, or a structure of 5 or less layers. The range of the number of layers of the interlayer film can be set by appropriately selecting the lower limit and the upper limit.

[0077] The interlayer film may include only a first layer. The interlayer film may include a first layer and a second layer disposed on a first surface side of the first layer. The interlayer film may include a first layer, a second layer disposed on a first surface side of the first layer, and a third layer disposed on a second surface side of the first layer opposite the first surface. The interlayer film may be a single-layer interlayer film or a multi-layer interlayer film. The structure of the interlayer film may be partially different. For example, the interlayer film may have a portion having a single-layer structure and a portion having a multi-layer structure. For example, the interlayer film may have a portion having a two-layer structure and a portion having a three-layer structure. For example, the interlayer film may have a portion having a three-layer structure and a portion having a four-layer structure. The interlayer film may have another layer in a portion between the first layer and the second layer. The interlayer film may have another layer in a portion between the first layer and the third layer. The interlayer may have another layer in a partial region of the first layer, and the other layer may be embedded in the first layer. The interlayer may have another layer in a partial region of the second layer, and the other layer may be embedded in the second layer. The interlayer may have another layer in a partial region of the third layer, and the other layer may be embedded in the third layer. The other layer may be a layer containing a colorant (colored layer).

[0078] The interlayer film preferably includes a layer containing heat-shielding particles and an ultraviolet absorber. When the interlayer film is a single-layer interlayer film having a single layer structure, the interlayer film includes only a first layer containing heat-shielding particles and an ultraviolet absorber. When the interlayer film is a multilayer interlayer film having a two or more layer structure, the interlayer film may include a layer containing heat-shielding particles and a layer containing an ultraviolet absorber, or may include a layer containing heat-shielding particles and an ultraviolet absorber. When the interlayer film is a multilayer interlayer film having a two or more layer structure, the interlayer film preferably includes at least one layer containing heat-shielding particles and an ultraviolet absorber. When the interlayer film is a multilayer interlayer film having a two or more layer structure, it is more preferable that at least one surface layer of the interlayer film is a layer containing heat-shielding particles and an ultraviolet absorber, and it is even more preferable that both surface layers of the interlayer film are layers containing heat-shielding particles and an ultraviolet absorber. When the interlayer film is a multilayer interlayer film having a structure of two or more layers, it is more preferable that the second layer is a surface layer of the interlayer film and that the second layer is a layer containing heat-shielding particles and an ultraviolet absorber. When the interlayer film is a multilayer interlayer film having a structure of three or more layers, it is more preferable that the third layer is a surface layer of the interlayer film and that the third layer is a layer containing heat-shielding particles and an ultraviolet absorber. When the interlayer film is a multilayer interlayer film having a structure of three or more layers, the first layer is a layer (intermediate layer) that is not a surface layer of the interlayer film, and the first layer may be a layer containing heat-shielding particles and an ultraviolet absorber, or it does not have to be a layer containing heat-shielding particles and an ultraviolet absorber.

[0079] The interlayer film will be described in further detail below.

[0080] <Heat-shielding particles> The interlayer film contains heat-shielding particles. The interlayer film includes a layer containing heat-shielding particles. The layer containing heat-shielding particles may be a layer containing heat-shielding particles but not containing an ultraviolet absorber, or may be a layer containing heat-shielding particles and an ultraviolet absorber. The first layer may or may not contain heat-shielding particles. The first layer preferably contains heat-shielding particles. The second layer may or may not contain heat-shielding particles. The second layer preferably contains heat-shielding particles. The third layer may or may not contain heat-shielding particles. The third layer preferably contains heat-shielding particles. Only one type of heat-shielding particle may be used, or two or more types may be used in combination. The heat-shielding particles contained in the first layer, the heat-shielding particles contained in the second layer, and the heat-shielding particles contained in the third layer may be the same or different. The heat-shielding particles contained in the second layer and the heat-shielding particles contained in the third layer may be the same or different.

[0081] Infrared rays, which have wavelengths of 780 nm or more, which are longer than visible light, have a smaller amount of energy than ultraviolet rays. However, infrared rays have a large thermal effect, and when infrared rays are absorbed by a substance, they are released as heat. For this reason, infrared rays are generally called heat rays. By using the above heat-shielding particles, infrared rays (heat rays) can be effectively blocked. Here, heat-shielding particles refer to particles that can absorb infrared rays.

[0082] In the following description, components common to the heat-shielding particles in the interlayer film, the heat-shielding particles in the first layer, the heat-shielding particles in the second layer, and the heat-shielding particles in the third layer will be simply referred to as "heat-shielding particles."

[0083] From the viewpoint of further enhancing the heat-shielding properties of the laminated glass, the heat-shielding particles are preferably metal oxide particles, and the heat-shielding particles are preferably particles formed from a metal oxide (metal oxide particles).

[0084] Examples of the heat-shielding particles include metal oxide particles such as 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 (sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, rubidium-doped tungsten oxide particles, etc.), tin-doped indium oxide particles (ITO particles), tin-doped zinc oxide particles, and silicon-doped zinc oxide particles; and lanthanum hexaboride (LaB ６ ) particles, etc. Note that other heat-shielding particles may also be used as the heat-shielding particles.

[0085] The heat-shielding particles are preferably metal oxide particles, more preferably contain ATO particles, GZO particles, IZO particles, ITO particles, or tungsten oxide particles, still more preferably contain ITO particles or tungsten oxide particles, and particularly preferably contain ITO particles and tungsten oxide particles, which can further enhance the heat-shielding properties of the laminated glass.

[0086] The heat-shielding particles in the first layer are preferably metal oxide particles, more preferably ATO particles, GZO particles, IZO particles, ITO particles, or tungsten oxide particles, still more preferably ITO particles or tungsten oxide particles, and particularly preferably ITO particles and tungsten oxide particles, which can further enhance the heat-shielding properties of the laminated glass.

[0087] The heat-shielding particles in the second layer are preferably metal oxide particles, more preferably ATO particles, GZO particles, IZO particles, ITO particles, or tungsten oxide particles, still more preferably ITO particles or tungsten oxide particles, and particularly preferably ITO particles and tungsten oxide particles, which can further enhance the heat-shielding properties of the laminated glass.

[0088] The heat-shielding particles in the third layer are preferably metal oxide particles, more preferably ATO particles, GZO particles, IZO particles, ITO particles, or tungsten oxide particles, still more preferably ITO particles or tungsten oxide particles, and particularly preferably ITO particles and tungsten oxide particles, which can further enhance the heat-shielding properties of the laminated glass.

[0089] From the viewpoint of further improving the heat-shielding properties of the laminated glass, the tungsten oxide particles are preferably metal-doped tungsten oxide particles. The "tungsten oxide particles" include metal-doped tungsten oxide particles. Specific examples of the metal-doped tungsten oxide particles include sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, and rubidium-doped tungsten oxide particles.

[0090] From the viewpoint of further improving the heat-shielding property of the laminated glass, the tungsten oxide particles are particularly preferably cesium-doped tungsten oxide particles. From the viewpoint of further improving the heat-shielding property of the laminated glass, the cesium-doped tungsten oxide particles are preferably represented by the formula: Cs ０．３３ WO ３ Preferably, the tungsten oxide particles are represented by the formula:

[0091] The average particle size of the heat-shielding particles is preferably 0.01 μm or more, more preferably 0.02 μm or more, and preferably 0.1 μm or less, more preferably 0.05 μm or less. When the average particle size is equal to or greater than the lower limit, the heat ray shielding property is sufficiently high. When the average particle size is equal to or less than the upper limit, the dispersibility of the heat-shielding particles is high.

[0092] The "average particle size" refers to the volume average particle size. The average particle size can be measured using a particle size distribution analyzer ("UPA-EX150" manufactured by Nikkiso Co., Ltd.) or the like.

[0093] The content of the heat-shielding particles, relative to 100% by weight of the interlayer film, is preferably 0.05% by weight or more, more preferably 0.10% by weight or more, even more preferably 0.20% by weight or more, particularly preferably 0.25% by weight or more, and preferably 0.8% by weight or less, more preferably 0.7% by weight or less, even more preferably 0.6% by weight or less, and particularly preferably 0.5% by weight or less. When the content of the heat-shielding particles is equal to or greater than the above-mentioned lower limit and equal to or less than the above-mentioned upper limit, the heat-shielding properties and visible light transmittance of the laminated glass can be further improved. Furthermore, when the content of the heat-shielding particles is equal to or greater than the above-mentioned lower limit and equal to or less than the above-mentioned upper limit, the solar transmittance Ts2100 and the color coordinate b ＊ Therefore, the interlayer film and the laminated glass Y having the region R can be obtained satisfactorily.

[0094] The content of the heat-shielding particles, relative to 100% by weight of the layer containing the heat-shielding particles, is preferably 0.05% by weight or more, more preferably 0.10% by weight or more, even more preferably 0.20% by weight or more, particularly preferably 0.25% by weight or more, and preferably 0.8% by weight or less, more preferably 0.7% by weight or less, even more preferably 0.6% by weight or less, and particularly preferably 0.5% by weight or less. When the content of the heat-shielding particles is equal to or more than the above-mentioned lower limit and equal to or less than the above-mentioned upper limit, the heat-shielding properties and visible light transmittance of the laminated glass can be further improved. Furthermore, when the content of the heat-shielding particles is equal to or more than the above-mentioned lower limit and equal to or less than the above-mentioned upper limit, the solar transmittance Ts2100 and the color coordinate b ＊ Therefore, the interlayer film and the laminated glass Y having the region R can be obtained satisfactorily.

[0095] The content of the heat-shielding particles in 100% by weight of the second layer is preferably 0.05% by weight or more, more preferably 0.10% by weight or more, even more preferably 0.20% by weight or more, particularly preferably 0.25% by weight or more, and preferably 0.8% by weight or less, more preferably 0.6% by weight or less, even more preferably 0.40% by weight or less, and particularly preferably 0.30% by weight or less. When the content of the heat-shielding particles is equal to or more than the above-mentioned lower limit and equal to or less than the above-mentioned upper limit, the heat-shielding properties and visible light transmittance of the laminated glass can be further improved. Furthermore, when the content of the heat-shielding particles is equal to or more than the above-mentioned lower limit and equal to or less than the above-mentioned upper limit, the solar transmittance Ts2100 and the color coordinate b ＊ Therefore, the interlayer film and the laminated glass Y having the region R can be obtained satisfactorily.

[0096] The content of the heat-shielding particles in 100% by weight of the third layer is preferably 0.05% by weight or more, more preferably 0.10% by weight or more, even more preferably 0.20% by weight or more, particularly preferably 0.25% by weight or more, and preferably 0.8% by weight or less, more preferably 0.6% by weight or less, even more preferably 0.40% by weight or less, and particularly preferably 0.30% by weight or less. When the content of the heat-shielding particles is equal to or more than the above-mentioned lower limit and equal to or less than the above-mentioned upper limit, the heat-shielding properties and visible light transmittance of the laminated glass can be further improved. Furthermore, when the content of the heat-shielding particles is equal to or more than the above-mentioned lower limit and equal to or less than the above-mentioned upper limit, the solar transmittance Ts2100 and the color coordinate b ＊ Therefore, the interlayer film and the laminated glass Y having the region R can be obtained satisfactorily.

[0097] When the interlayer film contains ITO particles and tungsten oxide particles, the weight ratio of the content of ITO particles in the interlayer film to the content of tungsten oxide particles in the interlayer film (ITO particle content / tungsten oxide particle content) is preferably at least 10, more preferably at least 15, and preferably at most 35, more preferably at most 30. When the weight ratio (ITO particle content / tungsten oxide particle content) is at least the above lower limit and at most the above upper limit, the solar transmittance Ts2100 and the color coordinate b ＊ Therefore, the interlayer film and the laminated glass Y having the region R can be obtained satisfactorily.

[0098] When the layer containing heat-shielding particles contains ITO particles and tungsten oxide particles, the weight ratio of the content of ITO particles in the layer containing heat-shielding particles to the content of tungsten oxide particles in the layer containing heat-shielding particles (ITO particle content / tungsten oxide particle content) is preferably at least 10, more preferably at least 15, and preferably at most 35, more preferably at most 30. When the weight ratio (ITO particle content / tungsten oxide particle content) is at least the above lower limit and at most the above upper limit, the solar transmittance Ts2100 and the color coordinate b ＊ Therefore, the interlayer film and the laminated glass Y having the region R can be obtained satisfactorily.

[0099] <Ultraviolet Absorber> The interlayer film contains an ultraviolet absorber. The interlayer film includes a layer containing an ultraviolet absorber. The layer containing an ultraviolet absorber may be a layer containing no heat-shielding particles and an ultraviolet absorber, or may be a layer containing heat-shielding particles and an ultraviolet absorber. The first layer may or may not contain an ultraviolet absorber. The first layer preferably contains an ultraviolet absorber. The second layer may or may not contain an ultraviolet absorber. The second layer preferably contains an ultraviolet absorber. The third layer may or may not contain an ultraviolet absorber. The third layer preferably contains an ultraviolet absorber. Only one type of ultraviolet absorber may be used, or two or more types may be used in combination. The ultraviolet absorber contained in the first layer, the ultraviolet absorber contained in the second layer, and the ultraviolet absorber contained in the third layer may be the same or different. The ultraviolet absorber contained in the second layer and the ultraviolet absorber contained in the third layer may be the same as or different from each other.

[0100] In the following description, the ultraviolet absorber in the interlayer film, the ultraviolet absorber in the first layer, the ultraviolet absorber in the second layer, and the ultraviolet absorber in the third layer that are common to each other will be simply referred to as "ultraviolet absorber."

[0101] The molecular weight of the ultraviolet absorber is preferably at least 350, more preferably at least 355, even more preferably at least 380, particularly preferably at least 400, and preferably at most 600, more preferably at most 500, and even more preferably at most 450. When the molecular weight of the ultraviolet absorber is at least the above lower limit and at most the above upper limit, the weather resistance of the laminated glass can be further improved while maintaining high ultraviolet absorption performance.

[0102] The ultraviolet absorber preferably includes a compound U having at least one of the following structures A, B, and C. The ultraviolet absorber in the first layer preferably includes a compound U having at least one of the following structures A, B, and C. The ultraviolet absorber in the second layer preferably includes a compound U having at least one of the following structures A, B, and C. The ultraviolet absorber in the third layer preferably includes a compound U having at least one of the following structures A, B, and C. In this case, the solar transmittance Ts2100 and color coordinate b ＊ This effectively reduces the area R, thereby enabling the interlayer film and laminated glass Y to be favorably obtained, each having the region R. Furthermore, the weather resistance of the laminated glass can be further improved.

[0103] Structure A: A compound having a maximum absorption wavelength of 345 nm or more and 355 nm or less. Structure B: A compound having a transmittance of 82% or less at a wavelength of 380 nm and a transmittance of 93% or more at a wavelength of 400 nm. Structure C: A compound having a benzotriazole skeleton, and in which no halogen atoms are bonded to the carbon atoms constituting the benzotriazole skeleton.

[0104] The compound U may have at least the structure A, may have at least the structure B, or may have at least the structure C. The compound U may have at least the structure A and the structure B, may have at least the structure B and the structure C, may have at least the structure A and the structure C, or may have the structure A, the structure B, and the structure C.

[0105] The compound U preferably has at least two of the structures A, B, and C, and more preferably has the structures A, B, and C. In this case, the solar transmittance Ts2100 and color coordinate b ＊This can more effectively reduce the area R, thereby making it possible to satisfactorily obtain the interlayer film and the laminated glass Y having the region R. Furthermore, the weather resistance of the laminated glass can be further improved.

[0106] The interlayer film preferably includes a layer containing compound U. The layer containing compound U may be a layer containing compound U but not containing heat-shielding particles, or may be a layer containing heat-shielding particles and compound U.

[0107] When the compound U has the structure A, the maximum absorption wavelength of the compound U is 345 nm or more and 355 nm or less, preferably 346 nm or more, more preferably 347 nm or more, still more preferably 348 nm or more, preferably 350 nm or less, and more preferably 349 nm or less. In this case, the solar transmittance Ts2100 and the color coordinate b ＊ This effectively reduces the area R, thereby enabling the interlayer film and laminated glass Y to be favorably obtained, each having the region R. Furthermore, the weather resistance of the laminated glass can be further improved.

[0108] The maximum absorption wavelength of the ultraviolet absorber can be measured using a spectrophotometer (for example, "U-4150" manufactured by Hitachi High-Technologies Corporation) in accordance with JIS R3106:1998 or JIS R3212:1998.

[0109] The maximum absorption wavelength refers to the wavelength at which transmittance exhibits a minimum value. There may be a plurality of maximum absorption wavelengths. In this specification, when there are a plurality of maximum absorption wavelengths, the wavelength at which the minimum value is smallest is referred to as the maximum absorption wavelength, to distinguish it from the maximum absorption wavelength. The compound of component A is preferably a compound having a maximum absorption wavelength of 345 nm or more and 355 nm or less. In this case, the solar transmittance Ts2100 and color coordinate b ＊ This can more effectively reduce the area R, thereby making it possible to satisfactorily obtain the interlayer film and the laminated glass Y having the region R. Furthermore, the weather resistance of the laminated glass can be further improved.

[0110] When the compound of component A has a maximum absorption wavelength of 345 nm or more and 355 nm or less, the maximum absorption wavelength of the compound is 345 nm or more and 355 nm or less, preferably 346 nm or more, more preferably 347 nm or more, still more preferably 348 nm or more, preferably 350 nm or less, and more preferably 349 nm or less. In this case, the solar transmittance Ts2100 and the color coordinate b ＊ This effectively reduces the area R, thereby enabling the interlayer film and laminated glass Y to be favorably obtained, each having the region R. Furthermore, the weather resistance of the laminated glass can be further improved.

[0111] When the compound U comprises the component B, the transmittance of the compound U at a wavelength of 380 nm is 82% or less, preferably 81.6% or less, more preferably 81.4% or less, and even more preferably 81.0% or less. When the transmittance at a wavelength of 380 nm is equal to or less than the upper limit, the solar transmittance Ts2100 of the laminated glasses X and Y can be effectively reduced. Furthermore, the weather resistance of the laminated glass can be further improved. Note that when the compound U comprises the component B, the transmittance at a wavelength of 380 nm of the compound U may be 50% or more, 52% or more, 55% or more, 60% or more, 65% or more, 70% or more, or 75% or more. The range of the transmittance at a wavelength of 380 nm of the compound U can be set by appropriately selecting the lower limit and the upper limit.

[0112] When the compound U has the structure B, the transmittance of the compound U at a wavelength of 400 nm is 93% or more, preferably 94% or more, more preferably 95% or more, even more preferably 96% or more, and particularly preferably 97% or more. When the transmittance at a wavelength of 400 nm is equal to or less than the upper limit, the solar transmittance Ts2100 and the color coordinate b ＊This effectively reduces the transmittance of the compound U at a wavelength of 400 nm, thereby enabling the interlayer film and laminated glass Y having the region R to be favorably obtained. When the compound U has the structure B, the transmittance of the compound U at a wavelength of 400 nm may be 99% or less, 98% or less, or 97% or less. The range of the transmittance of the compound U at a wavelength of 400 nm can be set by appropriately selecting the lower limit and the upper limit.

[0113] The transmittance of the ultraviolet absorber at a wavelength of 380 nm and a wavelength of 400 nm is determined in accordance with JIS R3106:1998 using a spectrophotometer (for example, the "U-4100" manufactured by Hitachi High-Technologies Corporation) as follows. Triethylene glycol di-2-ethylhexanoate (3GO) is added to a quartz cell with an optical path length of 1 mm, and a baseline measurement is performed. A sample containing 0.012 wt% of ultraviolet absorber and 99.988 wt% of triethylene glycol di-2-ethylhexanoate (3GO) is added to a quartz cell with an optical path length of 1 mm, and the transmittance at a wavelength of 380 nm and the transmittance at a wavelength of 400 nm are measured. The transmittance at a wavelength of 380 nm of the obtained sample is taken as the transmittance at a wavelength of 380 nm of the ultraviolet absorber. Furthermore, the transmittance at a wavelength of 400 nm of the obtained sample is taken as the transmittance at a wavelength of 400 nm of the ultraviolet absorber.

[0114] The compound of Structure C above is a compound having a benzotriazole skeleton, and no halogen atoms are bonded to the carbon atoms constituting the benzotriazole skeleton. Preferably, the compound of Structure C above is a compound having a benzotriazole skeleton, and only atoms other than halogen atoms are bonded to the carbon atoms constituting the benzotriazole skeleton. Examples of atoms other than halogen atoms include hydrogen atoms, nitrogen atoms, oxygen atoms, and carbon atoms. In addition, in a benzotriazole skeleton, other carbon atoms (parts of the benzotriazole skeleton) are usually bonded to each of the six carbon atoms constituting the benzotriazole skeleton (carbon atoms forming the aromatic ring). In addition, in a benzotriazole skeleton, nitrogen atoms (parts of the benzotriazole skeleton) are usually bonded to each of the two carbon atoms constituting the benzotriazole skeleton. In addition, in a benzotriazole skeleton, hydrogen atoms or the like may be bonded to some of the carbon atoms constituting the benzotriazole skeleton.

[0115] When the compound U has the structure C, the compound U has a benzotriazole skeleton, and no halogen atoms are bonded to the carbon atoms constituting the benzotriazole skeleton. When the compound U has the structure C, the compound U preferably has a benzotriazole skeleton, and no halogen atoms are bonded to the carbon atoms constituting the benzotriazole skeleton. In this case, the solar transmittance Ts2100 and the color coordinate b ＊ This effectively reduces the area R, thereby enabling the interlayer film and laminated glass Y to be favorably obtained, each having the region R. Furthermore, the weather resistance of the laminated glass can be further improved.

[0116] The molecular weight of compound U is preferably 350 or more, more preferably 355 or more, even more preferably 380 or more, particularly preferably 400 or more, and preferably 600 or less, more preferably 500 or less, and even more preferably 450 or less. When the molecular weight of compound U is at least the above lower limit and at most the above upper limit, the weather resistance of the laminated glass can be further improved while maintaining high ultraviolet absorption performance.

[0117] Commercially available products of the compound U include "Tinuvin 928" manufactured by BASF.

[0118] The ultraviolet absorber preferably contains 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)phenol or 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol. The ultraviolet absorber more preferably contains 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)phenol. In these cases, the solar transmittance Ts2100 and color coordinate b ＊ This effectively reduces the area R, thereby enabling the interlayer film and laminated glass Y having the region R to be favorably obtained. Furthermore, the weather resistance of the laminated glass can be further improved. These preferred ultraviolet absorbers are those corresponding to compound U.

[0119] In order to achieve the effects of the present invention, the content of the ultraviolet absorber is 0.650% by weight or more and 2.60% by weight or less, based on 100% by weight of the interlayer film.

[0120] The content of the ultraviolet absorber in 100% by weight of the interlayer film is preferably 0.670% by weight or more, more preferably 0.700% by weight or more, even more preferably 1.00% by weight or more, particularly preferably 1.20% by weight or more, and preferably 2.52% by weight or less, more preferably 2.00% by weight or less, and even more preferably 1.50% by weight or less. When the content of the ultraviolet absorber is equal to or more than the above lower limit and equal to or less than the above upper limit, the solar transmittance Ts2100 and the color coordinate b ＊This effectively reduces the area R, thereby enabling the interlayer film and laminated glass Y to be favorably obtained, having the region R. Furthermore, when the content of the ultraviolet absorber is equal to or greater than the above lower limit and equal to or less than the above upper limit, the visible light transmittance of the interlayer film and laminated glass is even less likely to decrease even after long-term use. The content of the ultraviolet absorber, relative to 100% by weight of the interlayer film, may be 1.00% by weight or less, or may be 0.70% by weight or less.

[0121] The content of the compound U in the interlayer film is preferably 99.90% by weight or more, more preferably 99.92% by weight or more, and even more preferably 99.95% by weight or more, based on 100% by weight of the ultraviolet absorber. When the content of the compound U is equal to or more than the lower limit, the solar transmittance Ts2100 and the color coordinate b ＊ This effectively reduces the amount of ultraviolet absorber in the interlayer film, thereby enabling the interlayer film and the laminated glass Y having the region R to be favorably obtained. The content of compound U in 100% by weight of the ultraviolet absorber in the interlayer film may be 100% by weight or less, or less than 100% by weight, or may be 99.99% by weight or less, or may be 99.96% by weight or less. The range of the content of compound U in 100% by weight of the ultraviolet absorber in the interlayer film can be set by appropriately selecting the lower limit and the upper limit.

[0122] The weight ratio of the content of the ultraviolet absorber in the interlayer film to the content of the heat-shielding particles in the interlayer film (content of ultraviolet absorber / content of heat-shielding particles) is preferably 0.50 or more, more preferably 1.0 or more, and preferably 10 or less, more preferably 9 or less. When the weight ratio (content of ultraviolet absorber / content of heat-shielding particles) is equal to or more than the above lower limit and equal to or less than the above upper limit, the solar transmittance Ts2100 and the color coordinate b ＊ Therefore, the interlayer film and the laminated glass Y having the region R can be obtained satisfactorily.

[0123] The weight ratio of the content of compound U in the interlayer film to the content of heat-shielding particles in the interlayer film (content of compound U / content of heat-shielding particles) is preferably 0.50 or more, more preferably 1.0 or more, and preferably 10 or less, more preferably 9 or less. When the weight ratio (content of compound U / content of heat-shielding particles) is equal to or greater than the above lower limit and equal to or less than the above upper limit, the solar transmittance Ts2100 and the color coordinate b ＊ Therefore, the interlayer film and the laminated glass Y having the region R can be obtained satisfactorily.

[0124] The content of the ultraviolet absorber in 100% by weight of the layer containing the ultraviolet absorber is preferably 0.650% by weight or more, more preferably 0.670% by weight or more, even more preferably 0.700% by weight or more, even more preferably 1.00% by weight or more, particularly preferably 1.20% by weight or more, preferably 2.60% by weight or less, more preferably 2.52% by weight or less, even more preferably 2.00% by weight or less, and particularly preferably 1.50% by weight or less. When the content of the ultraviolet absorber is equal to or more than the above lower limit and equal to or less than the above upper limit, the solar transmittance Ts2100 and the color coordinate b ＊ This effectively reduces the area R, thereby enabling the interlayer film and laminated glass Y to be favorably obtained, having the region R. Furthermore, when the content of the ultraviolet absorber is equal to or greater than the above lower limit and equal to or less than the above upper limit, the visible light transmittance of the interlayer film and laminated glass is even less likely to decrease even after long-term use. The content of the ultraviolet absorber may be 1.00 wt % or less, or 0.70 wt % or less, relative to 100 wt % of the layer containing the ultraviolet absorber.

[0125] The content of the compound U in the layer containing the ultraviolet absorber is preferably 99.90% by weight or more, more preferably 99.92% by weight or more, and even more preferably 99.95% by weight or more, based on 100% by weight of the ultraviolet absorber. When the content of the compound U is equal to or more than the lower limit, the solar transmittance Ts2100 and the color coordinate b ＊This effectively reduces the amount of ultraviolet absorber in the ultraviolet absorber-containing layer, thereby enabling the interlayer film and laminated glass Y having the region R to be favorably obtained. The content of compound U in 100% by weight of the ultraviolet absorber in the ultraviolet absorber-containing layer may be 100% by weight or less, or less than 100% by weight, or may be 99.99% by weight or less, or 99.96% by weight or less. The range of the content of compound U in 100% by weight of the ultraviolet absorber in the ultraviolet absorber-containing layer can be set by appropriately selecting the lower limit and the upper limit.

[0126] The weight ratio of the content of the ultraviolet absorber in the layer containing the heat-shielding particles and the ultraviolet absorber to the content of the heat-shielding particles in the layer containing the heat-shielding particles and the ultraviolet absorber (content of ultraviolet absorber / content of heat-shielding particles) is preferably 0.50 or more, more preferably 1.0 or more, and preferably 10 or less, more preferably 9 or less. When the weight ratio (content of ultraviolet absorber / content of heat-shielding particles) is equal to or more than the above lower limit and equal to or less than the above upper limit, the solar transmittance Ts2100 and the color coordinate b ＊ Therefore, the interlayer film and the laminated glass Y having the region R can be obtained satisfactorily.

[0127] The weight ratio of the content of compound U in the layer containing the heat-shielding particles and compound U to the content of the heat-shielding particles in the layer containing the heat-shielding particles and compound U (content of compound U / content of heat-shielding particles) is preferably 0.50 or more, more preferably 1.0 or more, and preferably 10 or less, more preferably 9 or less. When the weight ratio (content of compound U / content of heat-shielding particles) is equal to or more than the above lower limit and equal to or less than the above upper limit, the solar transmittance Ts2100 and the color coordinate b ＊ Therefore, the interlayer film and the laminated glass Y having the region R can be obtained satisfactorily.

[0128] <Thermoplastic Resin> The interlayer film preferably contains a thermoplastic resin (hereinafter may be referred to as thermoplastic resin (0)). The interlayer film preferably contains a polyvinyl acetal resin (hereinafter may be referred to as polyvinyl acetal resin (0)) as the thermoplastic resin (0). The first layer preferably contains a thermoplastic resin (hereinafter may be referred to as thermoplastic resin (1)). The first layer preferably contains a polyvinyl acetal resin (hereinafter may be referred to as polyvinyl acetal resin (1)) as the thermoplastic resin (1). The second layer preferably contains a thermoplastic resin (hereinafter may be referred to as thermoplastic resin (2)). The second layer preferably contains a polyvinyl acetal resin (hereinafter may be referred to as polyvinyl acetal resin (2)) as the thermoplastic resin (2). The third layer preferably contains a thermoplastic resin (hereinafter may be referred to as thermoplastic resin (3)). The third layer preferably contains a polyvinyl acetal resin (hereinafter sometimes referred to as polyvinyl acetal resin (3)) as the thermoplastic resin (3). The thermoplastic resin (1), the thermoplastic resin (2), and the thermoplastic resin (3) may be the same or different. Since sound insulation is further improved, the thermoplastic resin (1) is preferably different from the thermoplastic resin (2) and the thermoplastic resin (3). Since production efficiency of the interlayer film is improved, the thermoplastic resin (2) and the thermoplastic resin (3) are preferably the same. The polyvinyl acetal resin (1), the polyvinyl acetal resin (2), and the polyvinyl acetal resin (3) may be the same or different. Since sound insulation is further improved, the polyvinyl acetal resin (1) is preferably different from the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3). The polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) are preferably the same, since this increases the production efficiency of the interlayer film. The thermoplastic resin (0), the thermoplastic resin (1), the thermoplastic resin (2), and the thermoplastic resin (3) may each be used alone or in combination of two or more.The polyvinyl acetal resin (0), the polyvinyl acetal resin (1), the polyvinyl acetal resin (2), and the polyvinyl acetal resin (3) may each be used alone or in combination of two or more.

[0129] In the following description, the common components of the thermoplastic resin (0), the thermoplastic resin (1), the thermoplastic resin (2), and the thermoplastic resin (3) will be simply referred to as "thermoplastic resin."

[0130] Examples of the thermoplastic resin include polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, polyurethane resin, (meth)acrylic resin, polyolefin resin, ionomer resin, polyvinyl alcohol resin, etc. Thermoplastic resins other than these may also be used.

[0131] The polyvinyl acetal resin can be produced, 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 can be obtained, for example, by saponifying polyvinyl acetate. The degree of saponification of the polyvinyl alcohol is generally within the range of 70 mol% to 99.9 mol%.

[0132] The average degree of polymerization of the polyvinyl alcohol (PVA) is preferably 200 or more, more preferably 500 or more, even more preferably 1500 or more, even more preferably 1600 or more, particularly preferably 2600 or more, and most preferably 2700 or more, and is preferably 5000 or less, more preferably 4000 or less, and even more preferably 3500 or less. When the average degree of polymerization is at least the lower limit, the penetration resistance of the laminated glass is further improved. When the average degree of polymerization is at most the upper limit, the interlayer film is easily formed.

[0133] The average degree of polymerization of the polyvinyl alcohol is determined by a method in accordance with JIS K6726 "Testing methods for polyvinyl alcohol."

[0134] The number of carbon atoms in the acetal group contained in the polyvinyl acetal resin is not particularly limited. The aldehyde used in producing the polyvinyl acetal resin is not particularly limited. The number of carbon atoms in the acetal group in the polyvinyl acetal resin is preferably 3 to 5, and more preferably 3 or 4. When the number of carbon atoms in the acetal group in the polyvinyl acetal resin is 3 or more, the glass transition temperature of the interlayer film is sufficiently low. The number of carbon atoms in the acetal group in the polyvinyl acetal resin may be 4 or 5.

[0135] The aldehyde is not particularly limited. In general, an aldehyde having 1 to 10 carbon atoms is suitably used. Examples of the aldehyde having 1 to 10 carbon atoms include propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexylaldehyde, n-octylaldehyde, n-nonylaldehyde, n-decylaldehyde, formaldehyde, acetaldehyde, and benzaldehyde. The aldehyde is preferably propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexylaldehyde, or n-valeraldehyde, more preferably propionaldehyde, n-butyraldehyde, or isobutyraldehyde, and even more preferably n-butyraldehyde. The above aldehydes may be used alone or in combination of two or more.

[0136] 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 equal to or greater than the lower limit, the adhesive strength of the interlayer film is further increased. When the hydroxyl group content is equal to or less than the upper limit, the flexibility of the interlayer film is increased, making it easier to handle.

[0137] The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (1) is preferably 17 mol% or more, more preferably 20 mol% or more, even more preferably 22 mol% or more, and preferably 28 mol% or less, more preferably 27 mol% or less, even more preferably 25 mol% or less, and particularly preferably 24 mol% or less. When the hydroxyl group content is equal to or greater than the lower limit, the mechanical strength of the interlayer film is further increased. In particular, when the hydroxyl group content of the polyvinyl acetal resin (1) is 20 mol% or more, the reaction efficiency is high and productivity is excellent, and when it is 28 mol% or less, the sound insulation of the laminated glass is further improved. Furthermore, when the hydroxyl group content is equal to or less than the upper limit, the flexibility of the interlayer film is high, making it easier to handle.

[0138] The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 25 mol% or more, more preferably 28 mol% or more, more preferably 30 mol% or more, even more preferably 31.5 mol% or more, even more preferably 32 mol% or more, and particularly preferably 33 mol% or more. The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 38 mol% or less, more preferably 37 mol% or less, even more preferably 36.5 mol% or less, and particularly preferably 36 mol% or less. When the hydroxyl group content is at least the lower limit, the adhesive strength of the interlayer film is further increased. On the other hand, when the hydroxyl group content is at most the upper limit, the flexibility of the interlayer film is increased, making the interlayer film easier to handle.

[0139] From the viewpoint of further improving sound insulation, the hydroxyl group content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl group content of the polyvinyl acetal resin (2). From the viewpoint of further improving sound insulation, the hydroxyl group content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl group content of the polyvinyl acetal resin (3). The absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (2) is defined as absolute value A, and the absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (3) is defined as absolute value B. From the viewpoint of further improving sound insulation, the absolute values ​​A and B are each preferably 1 mol% or more, more preferably 5 mol% or more, even more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. The absolute value A and the absolute value B are each preferably 20 mol % or less.

[0140] The hydroxyl group content of the polyvinyl acetal resin is a molar fraction calculated by dividing the amount of ethylene groups having hydroxyl groups by the total amount of ethylene groups in the main chain, and is expressed as a percentage. The amount of ethylene groups having hydroxyl groups can be measured, for example, in accordance with JIS K6728 "Testing Methods for Polyvinyl Butyral."

[0141] The degree of acetylation (amount of acetyl groups) of the polyvinyl acetal resin (0) is preferably 0.1 mol% or more, more preferably 0.3 mol% or more, even more preferably 0.5 mol% or more, and is preferably 30 mol% or less, more preferably 25 mol% or less, even more preferably 20 mol% or less. When the degree of acetylation is equal to or greater than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is improved. When the degree of acetylation is equal to or less than the upper limit, the moisture resistance of the interlayer film and laminated glass is improved.

[0142] The degree of acetylation (amount of acetyl groups) of the polyvinyl acetal resin (1) is preferably 0.01 mol% or more, more preferably 0.1 mol% or more, even more preferably 7 mol% or more, even more preferably 9 mol% or more, preferably 30 mol% or less, more preferably 25 mol% or less, even more preferably 24 mol% or less, and particularly preferably 20 mol% or less. When the degree of acetylation is at least the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is improved. When the degree of acetylation is at most the upper limit, the moisture resistance of the interlayer film and laminated glass is improved. In particular, when the degree of acetylation of the polyvinyl acetal resin (1) is 0.1 mol% or more and 25 mol% or less, excellent penetration resistance is achieved.

[0143] The acetylation degree (acetyl group amount) of each of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 0.01 mol% or more, more preferably 0.5 mol% or more, and preferably 10 mol% or less, more preferably 2 mol% or less. When the acetylation degree is equal to or greater than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is improved. When the acetylation degree is equal to or less than the upper limit, the moisture resistance of the interlayer film and the laminated glass is improved.

[0144] The degree of acetylation is a molar fraction calculated by dividing the amount of ethylene groups having acetyl groups by the total amount of ethylene groups in the main chain, and is expressed as a percentage. The amount of ethylene groups having acetyl groups can be measured, for example, in accordance with JIS K6728 "Testing Methods for Polyvinyl Butyral."

[0145] The degree of acetalization of the polyvinyl acetal resin (0) (the degree of butyralization in the case of a polyvinyl butyral resin) is preferably 60 mol% or more, more preferably 63 mol% or more, and preferably 85 mol% or less, more preferably 75 mol% or less, and even more preferably 70 mol% or less. When the degree of acetalization is equal to or greater than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is increased. When the degree of acetalization is equal to or less than the upper limit, the reaction time required to produce the polyvinyl acetal resin is shortened.

[0146] The degree of acetalization of the polyvinyl acetal resin (1) (the degree of butyralization in the case of a polyvinyl butyral resin) is preferably 47 mol% or more, more preferably 60 mol% or more, and preferably 85 mol% or less, more preferably 80 mol% or less, and even more preferably 75 mol% or less. When the degree of acetalization is equal to or greater than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is increased. When the degree of acetalization is equal to or less than the upper limit, the reaction time required to produce the polyvinyl acetal resin is shortened.

[0147] The degree of acetalization of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) (the degree of butyralization in the case of a polyvinyl butyral resin) 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 degree of acetalization is equal to or greater than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is increased. When the degree of acetalization is equal to or less than the upper limit, the reaction time required to produce the polyvinyl acetal resin is shortened.

[0148] The degree of acetalization is determined as follows. First, the amount of ethylene groups to which hydroxyl groups are bonded and the amount of ethylene groups to which acetyl groups are bonded are subtracted from the total amount of ethylene groups in the main chain to determine the value. The obtained value is divided by the total amount of ethylene groups in the main chain to determine the molar fraction. The value expressed as a percentage of this molar fraction is the degree of acetalization.

[0149] The hydroxyl group content (hydroxyl group amount), acetalization degree (butyralization degree), and acetylation degree are preferably calculated from the results of measurements made in accordance with JIS K6728 "Testing Methods for Polyvinyl Butyral." However, measurements made in accordance with ASTM D1396-92 may also be used. When the polyvinyl acetal resin is a polyvinyl butyral resin, the hydroxyl group content (hydroxyl group amount), acetalization degree (butyralization degree), and acetylation degree can be calculated from the results of measurements made in accordance with JIS K6728 "Testing Methods for Polyvinyl Butyral."

[0150] The content of polyvinyl acetal resin in the interlayer film is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, still more preferably 70% by weight or more, particularly preferably 80% by weight or more, most preferably 90% by weight or more, and preferably 100% by weight or less, based on 100% by weight of the thermoplastic resin in the interlayer film. The main component (50% by weight or more) of the thermoplastic resin in the interlayer film is preferably polyvinyl acetal resin.

[0151] The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin in the layer containing the heat-shielding particles is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, still more preferably 70% by weight or more, particularly preferably 80% by weight or more, most preferably 90% by weight or more, and preferably 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin in the layer containing the heat-shielding particles is preferably a polyvinyl acetal resin.

[0152] The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin in the layer containing the ultraviolet absorber is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, still more preferably 70% by weight or more, particularly preferably 80% by weight or more, most preferably 90% by weight or more, and preferably 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin in the layer containing the ultraviolet absorber is preferably polyvinyl acetal resin.

[0153] The content of the polyvinyl acetal resin in the first layer is preferably 10 wt% or more, more preferably 30 wt% or more, even more preferably 50 wt% or more, still more preferably 70 wt% or more, particularly preferably 80 wt% or more, most preferably 90 wt% or more, and preferably 100 wt% or less, based on 100 wt% of the thermoplastic resin in the first layer. The main component (50 wt% or more) of the thermoplastic resin in the first layer is preferably polyvinyl acetal resin.

[0154] The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin in the second layer is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, still more preferably 70% by weight or more, particularly preferably 80% by weight or more, most preferably 90% by weight or more, and preferably 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin in the second layer is preferably polyvinyl acetal resin.

[0155] The content of the polyvinyl acetal resin in the third layer is preferably 10 wt % or more, more preferably 30 wt % or more, even more preferably 50 wt % or more, still more preferably 70 wt % or more, particularly preferably 80 wt % or more, most preferably 90 wt % or more, and preferably 100 wt % or less, based on 100 wt % of the thermoplastic resin in the third layer. The main component (50 wt % or more) of the thermoplastic resin in the third layer is preferably polyvinyl acetal resin.

[0156] <Plasticizer> From the viewpoint of further increasing the adhesive strength of the interlayer film, the interlayer film preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (0)). The first layer preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (1)). The second layer preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (2)). The third layer preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (3)). When the thermoplastic resin contained in the interlayer film is a polyvinyl acetal resin, it is particularly preferable that the interlayer film (each layer) contains a plasticizer. The layer containing a polyvinyl acetal resin preferably contains a plasticizer.

[0157] In the following description, the components common to the plasticizer (0), the plasticizer (1), the plasticizer (2), and the plasticizer (3) will be simply referred to as "plasticizer."

[0158] The plasticizer is not particularly limited. Any conventionally known plasticizer can be used as the plasticizer. Only one type of plasticizer may be used, or two or more types may be used in combination.

[0159] Examples of the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, organic phosphate plasticizers, and organic phosphite plasticizers. The plasticizer is preferably an organic ester plasticizer. The plasticizer is preferably a liquid plasticizer.

[0160] Examples of the monobasic organic acid ester include glycol esters obtained by reacting glycol with a monobasic organic acid. Examples of the glycol include triethylene glycol, tetraethylene glycol, and tripropylene glycol. Examples of the monobasic organic acid include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptyl acid, n-octylic acid, 2-ethylhexyl acid, n-nonylic acid, decylic acid, and benzoic acid.

[0161] Examples of the polybasic organic acid ester include ester compounds of a polybasic organic acid and an alcohol having a linear or branched structure and having 4 to 8 carbon atoms. Examples of the polybasic organic acid include adipic acid, sebacic acid, and azelaic acid.

[0162] Examples of the organic ester plasticizer include triethylene glycol di-2-ethylpropanoate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dicaprylate, 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-propylene glycol di-2-ethylbutyrate, 1,4-butylene glycol di-2-ethylbutyrate, and diethylene glycol di-2-ethylbutylene. Examples of suitable organic ester plasticizers include diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylpentanoate, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol dicaprylate, 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 alkyd sebacate, and a mixture of a phosphate ester and an adipate. Organic ester plasticizers other than those listed above may also be used as the organic ester plasticizer. Furthermore, adipate esters other than the above-mentioned adipate esters may also be used as the adipate ester.

[0163] Examples of the organic phosphoric acid plasticizer include tributoxyethyl phosphate, isodecylphenyl phosphate, and triisopropyl phosphate.

[0164] The plasticizer is preferably a diester plasticizer represented by the following formula (1):

[0165]

[0166] In the above formula (1), R1 and R2 each represent an organic group having 2 to 10 carbon atoms, R3 represents an ethylene group, an isopropylene group, or an n-propylene group, and p represents an integer of 3 to 10. In the above formula (1), R1 and R2 each preferably represent an organic group having 5 to 10 carbon atoms, and more preferably represent an organic group having 6 to 10 carbon atoms.

[0167] The plasticizer preferably includes triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH), or triethylene glycol di-2-ethylpropanoate. The plasticizer more preferably includes triethylene glycol di-2-ethylhexanoate (3GO) or triethylene glycol di-2-ethylbutyrate (3GH), and even more preferably includes triethylene glycol di-2-ethylhexanoate (3GO).

[0168] The content of the plasticizer (0) in the interlayer film relative to 100 parts by weight of the thermoplastic resin (0) is defined as the content (0). The content (0) is preferably 5 parts by weight or more, more preferably 25 parts by weight or more, even more preferably 30 parts by weight or more, and preferably 100 parts by weight or less, more preferably 60 parts by weight or less, even more preferably 50 parts by weight or less. When the content (0) is at least the lower limit, the penetration resistance of the laminated glass is further improved. When the content (0) is at most the upper limit, the transparency of the interlayer film is further improved.

[0169] The content of the plasticizer relative to 100 parts by weight of the thermoplastic resin in the layer containing the heat-shielding particles is defined as content (C1). The content of the plasticizer relative to 100 parts by weight of the thermoplastic resin in the layer containing the ultraviolet absorber is defined as content (C2). The contents (C1) and (C2) are each preferably 5 parts by weight or more, more preferably 25 parts by weight or more, even more preferably 30 parts by weight or more, and preferably 100 parts by weight or less, more preferably 60 parts by weight or less, even more preferably 50 parts by weight or less. When the contents (C1) and (C2) are at least the lower limits, the penetration resistance of the laminated glass is further improved. When the contents (C1) and (C2) are at most the upper limits, the transparency of the interlayer film is further improved.

[0170] The content of the plasticizer (0) in the interlayer film relative to 100 parts by weight of the thermoplastic resin (0) is defined as the content (0). The content (0) is preferably 5 parts by weight or more, more preferably 25 parts by weight or more, even more preferably 30 parts by weight or more, and preferably 100 parts by weight or less, more preferably 60 parts by weight or less, even more preferably 50 parts by weight or less. When the content (0) is at least the lower limit, the penetration resistance of the laminated glass is further improved. When the content (0) is at most the upper limit, the transparency of the interlayer film is further improved.

[0171] In the first layer, the content of the plasticizer (1) relative to 100 parts by weight of the thermoplastic resin (1) is defined as content (1). The content (1) is preferably 50 parts by weight or more, more preferably 55 parts by weight or more, and even more 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, even more preferably 85 parts by weight or less, and particularly preferably 80 parts by weight or less. When the content (1) is equal to or greater than the lower limit, the flexibility of the interlayer film is increased, making the interlayer film easier to handle. When the content (1) is equal to or less than the upper limit, the penetration resistance of the laminated glass is further improved.

[0172] In the second layer, the content of the plasticizer (2) relative to 100 parts by weight of the thermoplastic resin (2) is defined as content (2). In the third layer, the content of the plasticizer (3) relative to 100 parts by weight of the thermoplastic resin (3) is defined as content (3). The contents (2) and (3) are each preferably 5 parts by weight or more, more preferably 10 parts by weight or more, even more preferably 15 parts by weight or more, even more 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 contents (2) and (3) are each preferably 45 parts by weight or less, more preferably 40 parts by weight or less, even more 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 contents (2) and (3) are equal to or greater than the lower limits, the flexibility of the interlayer film is increased, making the interlayer film easier to handle. When the content (2) and the content (3) are equal to or less than the upper limit, the penetration resistance of the laminated glass is further improved.

[0173] In order to improve the sound insulation of the laminated glass, the content (1) is preferably greater than the content (2), and the content (1) is preferably greater than the content (3).

[0174] From the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the content (2) and the content (1) and the absolute value of the difference between the content (3) and the content (1) are each preferably 10 parts by weight or more, more preferably 15 parts by weight or more, and even more preferably 20 parts by weight or more. The absolute value of the difference between the content (2) and the content (1) and the absolute value of the difference between the content (3) and the content (1) are each preferably 80 parts by weight or less, more preferably 75 parts by weight or less, and even more preferably 70 parts by weight or less.

[0175] <Other Components> The interlayer film, the layer containing heat-shielding particles, the layer containing an ultraviolet absorber, the first layer, the second layer, and the third layer may each contain components other than the above-mentioned components (heat-shielding particles, ultraviolet absorber, thermoplastic resin, and plasticizer), as necessary. Examples of the other components include a heat-shielding substance other than the heat-shielding particles, a light-shielding agent, an antioxidant, an adhesion modifier, a light stabilizer, a flame retardant, an antistatic agent, a moisture-resistant agent, a heat ray reflecting agent, and a heat ray absorbing agent. Each of these other components may be used alone, or two or more types may be used in combination.

[0176] (Other Details of the Interlayer Film for Laminated Glass) The interlayer film has a first end (one end) and a second end (the other end). The first end and the second end are opposite ends of the interlayer film.

[0177] The interlayer film may be an interlayer film in which the thickness of the first end and the thickness of the second end are the same, or an interlayer film in which the thickness of the second end is greater than the thickness of the first end. The interlayer film may be an interlayer film with a uniform thickness or an interlayer film with a varying thickness. The cross-sectional shape of the interlayer film may be rectangular or wedge-shaped.

[0178] The distance between the first end and the second end of the interlayer film is preferably 0.5 m or more, more preferably 0.8 m or more, particularly preferably 1.0 m or more, and is preferably 3.0 m or less, more preferably 2.0 m or less, particularly preferably 1.5 m or less.

[0179] The maximum thickness of the interlayer is preferably 0.1 mm or more, more preferably 0.25 mm or more, even more preferably 0.5 mm or more, particularly preferably 0.8 mm or more, and is preferably 3.8 mm or less, more preferably 2.0 mm or less, and even more preferably 1.5 mm or less.

[0180] From the viewpoint of practical use and of sufficiently increasing adhesive strength and penetration resistance, the maximum thickness of the surface layer of the interlayer film is preferably 0.001 mm or more, more preferably 0.2 mm or more, and even more preferably 0.3 mm or more, and is preferably 1.0 mm or less, and more preferably 0.8 mm or less.

[0181] From a practical standpoint, the maximum thickness of the layer disposed between the two surface layers of the interlayer film (the layer (interlayer) that is not the surface layer of the interlayer film) is preferably 0.001 mm or more, more preferably 0.1 mm or more, even more preferably 0.2 mm or more, and is preferably 0.8 mm or less, more preferably 0.6 mm or less, even more preferably 0.3 mm or less. Furthermore, when the maximum thickness is equal to or greater than the above lower limit and equal to or less than the above upper limit, penetration resistance can be sufficiently improved.

[0182] The interlayer film may be wound into a roll of the interlayer film. The roll may include a winding core and the interlayer film wound around the outer periphery of the winding core.

[0183] The method for producing the interlayer film is not particularly limited. In the case of a single-layer interlayer film, the method for producing the interlayer film includes extruding a resin composition using an extruder. In the case of a multi-layer interlayer film, the method for producing the interlayer film includes, for example, forming each layer using a resin composition for each layer, and then laminating the resulting layers. Furthermore, the method for producing the interlayer film includes co-extruding the resin compositions for each layer using an extruder to laminate the layers. A production method using extrusion molding is preferred because it is suitable for continuous production.

[0184] In view of excellent production efficiency of the interlayer film, it is preferable that the second layer and the third layer contain the same polyvinyl acetal resin. In view of excellent production efficiency of the interlayer film, it is more preferable that the second layer and the third layer contain the same polyvinyl acetal resin and the same plasticizer. In view of excellent production efficiency of the interlayer film, it is even more preferable that the second layer and the third layer are formed from the same resin composition. In view of excellent production efficiency of the interlayer film, it is preferable that the second layer and the third layer have the same composition.

[0185] The interlayer film preferably has an uneven shape on at least one of its two surfaces. The interlayer film more preferably has an uneven shape on both surfaces. The method for forming the uneven shape is not particularly limited, and examples thereof include lip embossing (melt fracture), embossing roll, calender roll, and profile extrusion.

[0186] (Other Details of the Laminated Glass) The laminated glass includes a first laminated glass member, a second laminated glass member, and an interlayer film for laminated glass. In the laminated glass, the interlayer film for laminated glass is disposed between the first laminated glass member and the second laminated glass member. In the laminated glass, the interlayer film for laminated glass is preferably the interlayer film described above.

[0187] Examples of the first and second laminated glass members include glass plates and PET (polyethylene terephthalate) films. The laminated glass includes not only laminated glass in which an interlayer film is sandwiched between two glass plates, but also laminated glass in which an interlayer film is sandwiched between a glass plate and a PET film or the like. The laminated glass is a laminate including glass plates, and preferably contains at least one glass plate. It is preferable that the first and second laminated glass members are each glass plates or PET (polyethylene terephthalate) films, and that the laminated glass includes at least one glass plate as the first and second laminated glass members. It is particularly preferable that both the first and second laminated glass members are glass plates.

[0188] Examples of the glass plate include inorganic glass and organic glass. Examples of the inorganic glass include float glass, heat-absorbing glass, heat-reflecting glass, polished glass, patterned glass, wired glass, striped glass, and green glass. The organic glass is a synthetic resin glass that replaces inorganic glass. Examples of the organic glass include polycarbonate plates and poly(meth)acrylic resin plates. Examples of the poly(meth)acrylic resin plates include polymethyl(meth)acrylate plates.

[0189] The thickness of each of the first laminated glass member and the second laminated glass member is not particularly limited, but is preferably 1 mm or more and 5 mm or less. When the laminated glass member is a glass plate, the thickness of the glass plate is preferably 1 mm or more and 5 mm or less. When the laminated glass member is a PET film, the thickness of the PET film is preferably 0.03 mm or more and 0.5 mm or less.

[0190] The thicknesses of the first and second laminated glass members refer to average thicknesses.

[0191] The method for producing the laminated glass is not particularly limited. The laminated glass can be produced, for example, as follows. First, an interlayer film is sandwiched between the first laminated glass member and the second laminated glass member to obtain a laminate. Next, the air remaining between the first laminated glass member, the second laminated glass member, and the interlayer film is removed, for example, by passing the obtained laminate through a pressure roll or placing it in a rubber bag and suctioning it under reduced pressure. Thereafter, a pre-bonded laminate is obtained by pre-bonding at about 70°C to 110°C. Next, the pre-bonded laminate is placed in an autoclave or pressed at about 120°C to 150°C and a pressure of 1 MPa to 1.5 MPa. In this manner, a laminated glass can be obtained.

[0192] (Vehicle) A vehicle according to the present invention includes a vehicle body, the above-described laminated glass, and a camera sensor. In the vehicle according to the present invention, the camera sensor is disposed in a position where light emitted from the camera sensor can pass through the region R. In the vehicle according to the present invention, light emitted from the camera sensor can pass through the region R. This specification also discloses an invention of "use of the above-described interlayer film for laminated glass in the laminated glass in a vehicle including a vehicle body, laminated glass, and a camera sensor for irradiating the laminated glass with light so that the light passes through the laminated glass."

[0193] The camera sensor is preferably a camera sensor capable of emitting infrared light, and is preferably an infrared camera sensor, which can easily detect objects even in dark places or in the presence of obstacles such as smoke, fog, snow, or water droplets.

[0194] The camera sensor is preferably a camera sensor for detecting information outside the vehicle.

[0195] Examples of the vehicle include automobiles, railroad cars, aircraft, ships, etc. Examples of the vehicle body include automobile bodies, railroad car bodies, aircraft bodies, ships, etc. The vehicle is preferably an automobile, and the vehicle body is preferably an automobile body.

[0196] In the vehicle, the first laminated glass member of the laminated glass may be disposed on the interior side of the vehicle, and the second laminated glass member of the laminated glass may be disposed on the interior side of the vehicle.

[0197] The camera sensor is preferably located inside the vehicle, and may be located on the surface of the laminated glass member on the inside of the vehicle, or may be located apart from the laminated glass member.

[0198] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0199] The polyvinyl acetal resin used was acetalized using n-butylaldehyde having a carbon number of 4. The degree of acetalization (degree of butyralization), degree of acetylation, and hydroxyl group content of the polyvinyl acetal resin were measured by a method conforming to JIS K6728 "Testing Methods for Polyvinyl Butyral." Note that when measured by ASTM D1396-92, the values ​​shown were similar to those obtained by the method conforming to JIS K6728 "Testing Methods for Polyvinyl Butyral."

[0200] The following materials were prepared:

[0201] (Thermoplastic resin) PVB1: Polyvinyl acetal resin (polyvinyl butyral resin), average degree of polymerization 3000, hydroxyl group content 22 mol%, acetylation degree 13 mol%, acetalization degree (butyralization degree) 65 mol% PVB2: Polyvinyl acetal resin (polyvinyl butyral resin), average degree of polymerization 1700, hydroxyl group content 30.5 mol%, acetylation degree 1 mol%, acetalization degree (butyralization degree) 68.5 mol%

[0202] (Plasticizer) 3GO: Triethylene glycol di-2-ethylhexanoate

[0203] (Ultraviolet Absorber) Ultraviolet absorber corresponding to Compound U: Tinuvin 928: 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)phenol ("Tinuvin 928" manufactured by BASF)

[0204] Ultraviolet absorbers not corresponding to Compound U: Tinuvin 326: 2-(2'-hydroxy-3'-t-butyl-5-methylphenyl)-5-chlorobenzotriazole ("Tinuvin 326" manufactured by BASF)

[0205] The maximum absorption wavelength, transmittance at a wavelength of 380 nm, and transmittance at a wavelength of 400 nm of the above-mentioned ultraviolet absorber are shown in the following Table 1. Note that these maximum absorption wavelength, transmittance at a wavelength of 380 nm, and transmittance at a wavelength of 400 nm are values ​​measured by the above-mentioned method.

[0206]

[0207] (Heat-shielding particles) ITO particles (tin-doped indium oxide particles, average particle diameter 50 nm) CWO particles (Cs ０．３３ WO ３ Tungsten oxide particles represented by the formula (I), average particle diameter 50 nm)

[0208] (Heat-shielding material different from heat-shielding particles) Phthalocyanine compounds (phthalocyanine and phthalocyanine derivatives)

[0209] (Metal salt) Mg mixture (a 50:50 (weight ratio) mixture of magnesium 2-ethylbutyrate and magnesium acetate)

[0210] (Antioxidant) BHT: 2,6-di-t-butyl-p-cresol

[0211] Example 1 Preparation of resin composition for forming first layer: The following components were blended and thoroughly kneaded with a mixing roll to obtain a resin composition for forming the first layer.

[0212] PVB1: 100 parts by weight; 3GO: 40 parts by weight; Tinuvin 928 in an amount that would result in 0.67% by weight in the resulting first layer; Mg mixture in an amount that would result in 60 ppm of magnesium in the resulting first layer; BHT in an amount that would result in 0.4% by weight in the resulting first layer.

[0213] Preparation of resin composition for forming second layer and third layer: The following components were blended and thoroughly kneaded with a mixing roll to obtain a resin composition for forming the second layer and the third layer.

[0214] PVB2: 100 parts by weight; 3GO: 40 parts by weight; Tinuvin 928 in an amount that results in 0.67% by weight in the second and third layers; ITO particles in an amount that results in 0.243% by weight in the second and third layers; CWO particles in an amount that results in 0.0151% by weight in the second and third layers; Mg mixture in an amount that results in 60 ppm magnesium in the second and third layers; and BHT in an amount that results in 0.4% by weight in the second and third layers.

[0215] Preparation of interlayer film: The resin composition for forming the first layer and the resin compositions for forming the second and third layers were co-extruded using a co-extruder to obtain an interlayer film (thickness 760 μm) having a three-layer structure (second layer / first layer / third layer).

[0216] Preparation of laminated glass: The obtained interlayer film was sandwiched between two 2 mm thick clear glass sheets (300 mm long x 300 mm wide) conforming to JIS R3202:1996 to obtain a laminate. The obtained laminate was placed in a rubber bag and degassed at a vacuum of 2.6 kPa for 20 minutes, then transferred to an oven in the degassed state and held at 90°C for 30 minutes for vacuum pressing to pre-bond the laminate. The pre-bonded laminate was then pressed in an autoclave at 135°C and a pressure of 1.2 MPa for 20 minutes to obtain a laminated glass. The obtained laminated glass corresponds to the above-mentioned laminated glass X.

[0217] (Examples 2 to 7 and Comparative Examples 1 to 10) Interlayer films (thickness 760 μm) having a three-layer structure (second layer / first layer / third layer) were prepared in the same manner as in Example 1, except that the type and content of the ultraviolet absorber and the type and content of the heat-shielding material were changed as shown in Tables 2 to 4. The metal salts and antioxidants used were the same in type and amount as in Example 1.

[0218] Preparation of Laminated Glass: Laminated glass was obtained in the same manner as in Example 1 using the obtained interlayer film.

[0219] (Evaluation) (1) Solar transmittance Ts2100 of laminated glass The solar transmittance Ts2100 of the laminated glass was measured by measuring the transmittance at a wavelength of 300 nm or more and 2100 nm or less using a spectrophotometer (Hitachi High-Technologies Corporation's "U-4100") in accordance with JIS R3106:1998.

[0220] [Criteria for determining solar transmittance Ts2100 of laminated glass] ○: Solar transmittance Ts2100 is 62.5% or less ×: Solar transmittance Ts2100 exceeds 62.5%

[0221] (2) Color coordinate of laminated glass According to JIS Z8781-4:2013, the L of laminated glass ＊ a ＊ b ＊ Color coordinate a in the color system ＊ and color coordinate b ＊ The color coordinates b ＊ was evaluated according to the following criteria.

[0222] [Color coordinates of laminated glass b ＊ Criteria for determining whether the color coordinate is b ＊ is 2.0 or less ×: color coordinate b ＊ exceeds 2.0

[0223] The solar transmittance Ts2100 and color coordinate b of the above laminated glass ＊ The region R was determined from the measured values.

[0224] (3) Color difference ΔE of laminated glass before and after weather resistance test The color difference ΔE of laminated glass before and after weather resistance test was determined according to the method described above. The weather resistance tester used was an "SX75" manufactured by Suga Test Instruments Co., Ltd.

[0225] [Evaluation criteria for color difference ΔE of laminated glass before and after weather resistance test] ○: Color difference ΔE is 0.5 or less ×: Color difference ΔE exceeds 0.5

[0226] (4) Visible Light Transmittance Tv of Laminated Glass The visible light transmittance (Visible Transmittance) of the obtained laminated glass in the wavelength range of 380 nm to 780 nm was measured using a spectrophotometer (Hitachi High-Technologies Corporation's "U-4150") in accordance with JIS R3106:1998.

[0227] The interlayer structure and results are shown in Tables 2 to 4 below.

[0228]

[0229]

[0230]

[0231] REFERENCE SIGNS LIST 1...first layer 1a...first surface 1b...second surface 2...second layer 3...third layer 11, 11A...interlayer film 21...first laminated glass member 22...second laminated glass member 31, 31A...laminated glass R...region R

Claims

1. An interlayer film for laminated glass, comprising heat-shielding particles and an ultraviolet absorber, wherein the content of the ultraviolet absorber in 100% by weight of the interlayer film is 0.650% by weight or more and 2.60% by weight or less, and when the interlayer film is placed between two sheets of clear glass conforming to JIS R3202:1996 to obtain laminated glass X, the solar transmittance Ts2100 of the laminated glass X is 62.5% or less and the L of the laminated glass X is 62.5% or less. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ An interlayer film for laminated glass having a region R in which R is 2.0 or less.

2. The interlayer film for laminated glass according to claim 1, wherein the content of the heat-shielding particles is 0.05% by weight or more and 0.8% by weight or less, based on 100% by weight of the interlayer film.

3. The interlayer film for laminated glass according to claim 1 or 2, wherein the ultraviolet absorber comprises a compound U having at least one of the following structures A, B, and C. Structure A: A compound having a maximum absorption wavelength of 345 nm or more and 355 nm or less. Structure B: A compound having a transmittance of 82% or less at a wavelength of 380 nm and a transmittance of 93% or more at a wavelength of 400 nm. Structure C: A compound having a benzotriazole skeleton, in which no halogen atoms are bonded to the carbon atoms that make up the benzotriazole skeleton.

4. The interlayer film for laminated glass according to claim 3, wherein the compound U has at least two of the structures A, B, and C.

5. The interlayer film for laminated glass according to claim 3 or 4, wherein the compound U comprises the components A, B, and C.

6. The interlayer film for laminated glass according to any one of claims 1 to 5, wherein, when a weather resistance test is conducted in which the laminated glass X is irradiated with light having a wavelength of 300 nm or more and 400 nm or less for 500 hours, the color difference ΔE between the region R of the laminated glass X before the weather resistance test and the region R of the laminated glass X after the weather resistance test is 0.5 or less.

7. The interlayer film for laminated glass according to any one of claims 1 to 6, wherein the ultraviolet absorber comprises 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)phenol or 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol.

8. The interlayer film for laminated glass according to any one of claims 1 to 7, wherein the heat-shielding particles include tin-doped indium oxide particles or tungsten oxide particles.

9. The interlayer film for laminated glass according to any one of claims 1 to 8, which contains a thermoplastic resin.

10. The interlayer film for laminated glass according to claim 9, wherein the thermoplastic resin comprises a polyvinyl acetal resin.

11. The interlayer film for laminated glass according to any one of claims 1 to 10, which contains a plasticizer.

12. A laminated glass comprising: a first laminated glass element; a second laminated glass element; and the interlayer film for laminated glass according to any one of claims 1 to 11, wherein the interlayer film is disposed between the first laminated glass element and the second laminated glass element.

13. A laminated glass comprising a first laminated glass element, a second laminated glass element, and an interlayer film for laminated glass, the interlayer film being disposed between the first laminated glass element and the second laminated glass element, the interlayer film containing heat-shielding particles and an ultraviolet absorber, the content of the ultraviolet absorber being 0.650% by weight or more and 2.60% by weight or less in 100% by weight of the interlayer film, the solar transmittance Ts2100 of the laminated glass being 62.5% or less, and the L of the laminated glass being 1.0% by weight or less. ＊ a ＊ b ＊ Color coordinate b in the color system ＊ The laminated glass has a region R in which R is 2.0 or less.

14. A vehicle comprising: a vehicle body; the laminated glass according to claim 12 or 13; and a camera sensor, wherein the camera sensor is disposed at a position where light emitted from the camera sensor can pass through the region R.

15. Use of the interlayer film for laminated glass according to any one of claims 1 to 10 in a vehicle comprising a vehicle body, laminated glass, and a camera sensor for irradiating the laminated glass with light so that the light passes through the laminated glass.

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