Intermediate film for laminated glass and laminated glass

Abstract

This invention provides an interlayer for laminated glass that reduces the likelihood of yellowing and improves the adhesion between the interlayer and the laminated glass component. The interlayer for laminated glass of this invention has a single-layer structure or a structure with two or more layers, and comprises an ultraviolet absorber and a metal salt represented by the following formula (X). In the above formula (X), R1 represents any radical, and R2 to R8 represent hydrogen atoms, atoms other than hydrogen atoms, or any radical, respectively.

Description

Intermediate film for laminated glass and laminated glass This invention relates to an intermediate film for obtaining laminated glass. Furthermore, this invention relates to a laminated glass. Even when laminated glass breaks due to external impact, the amount of glass fragments scattered is relatively small, resulting in excellent safety. Therefore, laminated glass is widely used in automobiles, rail vehicles, airplanes, ships, and buildings. Laminated glass is manufactured by sandwiching an interlayer between two glass panes. To suppress ultraviolet (UV) transmission, an interlayer containing a UV absorber with a benzotriazole framework is sometimes used (e.g., Patent Document 1 below). Furthermore, to improve the adhesion between the interlayer and the laminated glass component (glass plate, etc.), an interlayer containing a metal salt is sometimes used in the laminated glass. [Prior Art Documents] [Patent Documents] [Patent Document 1] WO2015 / 088866A1 [The problem the invention aims to solve] To suppress ultraviolet (UV) transmission and improve the adhesion between the interlayer and the laminated glass component, an interlayer comprising both a UV absorber and a metal salt is being considered. However, previous combinations of UV absorbers with a benzotriazole framework and metal salts have resulted in yellowing of the interlayer. While reducing the metal salt content can suppress yellowing to some extent, it reduces the adhesion between the interlayer and the laminated glass component. Therefore, it is difficult for the previous interlayer containing UV absorbers with a benzotriazole framework and metal salts to achieve the two effects of being less prone to yellowing and improving the adhesion between the interlayer and the laminated glass components. The object of this invention is to provide an interlayer for laminated glass that reduces yellowing and improves the adhesion between the interlayer and the laminated glass component. Furthermore, the object of this invention is also to provide a laminated glass using the aforementioned interlayer for laminated glass. [Technical Means for Solving the Problem] According to a generalized view of the present invention, an interlayer film (hereinafter, sometimes referred to as an interlayer film) for laminated glass is provided, which has a single-layer structure or a structure of two or more layers, and comprises an ultraviolet absorber and a metal salt represented by the following formula (X). [Chemistry 1] In the above formula (X), R 1 represents any basis, R 2~R 8 represents a hydrogen atom, an atom other than a hydrogen atom, or any radical. In a specific state of the intermediate film of the present invention, the intermediate film has a layer comprising the ultraviolet absorber and the metal salt. In a specific state of the intermediate membrane of the present invention, in the above formula (X), R 1 is alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. In a specific state of the intermediate film of the present invention, the molecular weight of the ultraviolet absorber is 355 or more. In a specific state of the intermediate film of the present invention, the ultraviolet absorber comprises an ultraviolet absorber represented by the following formula (X11), the following formula (X12) or the following formula (X13). [Chemistry 2] [Chemistry 3] [Chemistry 4] In a specific state of the intermediate membrane of the present invention, the metal salt comprises an alkali metal salt or an alkaline earth metal salt. In a specific state of the intermediate membrane of the present invention, the metal salt comprises a magnesium salt of an organic acid having a branched structure. In a specific state of the intermediate membrane of the present invention, the metal salt includes a metal salt of an organic acid having 2 to 8 carbon atoms, which is a metal salt other than a magnesium salt of an organic acid having a branched structure. In a specific form of the intermediate film of the present invention, the intermediate film is an intermediate film for laminated glass having a structure of two or more layers, comprising a first layer and a second layer disposed on the first surface side of the first layer. In a specific state of the intermediate film of the present invention, the second layer is the surface layer of the intermediate film, and the second layer contains the ultraviolet absorber and the metal salt. In a specific state of the intermediate film of the present invention, the intermediate film is an intermediate film for laminated glass having a structure of three or more layers, and includes a third layer disposed on the second surface side of the first layer opposite to the first surface. In a specific state of the intermediate film of the present invention, the third layer is the surface layer of the intermediate film, and the third layer contains the ultraviolet absorber and the metal salt. In a specific state of the intermediate film of the present invention, the intermediate film includes a layer comprising the ultraviolet absorber and the metal salt, wherein the weight ratio of the metal content of the metal salt to the content of the ultraviolet absorber in the layer comprising the ultraviolet absorber is 4 to 50. In a specific state of the intermediate film of the present invention, the maximum transmittance of the intermediate film at wavelengths above 300 nm and below 350 nm is 0.1% or less. In a specific state of the intermediate film of the present invention, the ultraviolet transmittance (Tuv) of the intermediate film is less than 0.5%. In a specific state of the intermediate film of the present invention, the transmittance of the intermediate film at a wavelength of 400 nm is 1.5% or more. In a specific state of the intermediate film of the present invention, the absolute value of the difference between the yellow index YI of the intermediate film and the yellow index YI of a comparative intermediate film having the same layer composition and thickness as the intermediate film except that it does not contain metal salt is 0.1 or less. According to a generalized embodiment of the present invention, a laminated glass is provided, comprising a first laminated glass member, a second laminated glass member, and an interlayer film for the laminated glass, wherein the interlayer film for the laminated glass is disposed between the first laminated glass member and the second laminated glass member. [Effects of the Invention] The interlayer for laminated glass of the present invention has a single-layer structure or a structure of two or more layers. The interlayer for laminated glass of the present invention comprises an ultraviolet absorber represented by formula (X) and a metal salt. Due to the above-described structure, the interlayer for laminated glass of the present invention makes yellowing less likely and improves the adhesion between the interlayer and the laminated glass component. The details of the present invention will be described below. (Intermediate film for laminated glass) The intermediate film for laminated glass of the present invention (sometimes referred to as "intermediate film" in this specification) is used in laminated glass. The intermediate film of the present invention has a single-layer structure or a structure with two or more layers. The intermediate film of the present invention may have a single-layer structure or a structure with two or more layers. The intermediate film of the present invention may also have a two-layer structure, a structure with two or more layers, a structure with three or more layers. The intermediate film of the present invention may only have a first layer. The intermediate film of the present invention may also have a first layer and a second layer disposed on the first surface side of the first layer. The intermediate film of the present invention may also have a first layer, a second layer disposed on the first surface side of the first layer, and a third layer disposed on the second surface side of the first layer opposite to the first surface. The intermediate film of the present invention may be a single-layer intermediate film or a multi-layer intermediate film. The structure of the intermediate film of the present invention may also be partially different. For example, the intermediate film of the present invention may also include a portion having a single-layer structure and a portion having a multi-layer structure. The intermediate membrane of the present invention comprises an ultraviolet absorber represented by the following formula (X) (sometimes abbreviated as "ultraviolet absorber (X)" in this specification) and a metal salt. Therefore, the intermediate membrane of the present invention comprises an ultraviolet absorber (X) and a metal salt. [Chemistry 5] In the above formula (X), R 1 represents any basis, R 2~R 8 represents a hydrogen atom, an atom other than a hydrogen atom, or any radical. Regarding previous combinations of UV absorbers with a benzotriazole skeleton and metal salts, yellowing of the interlayer has occurred. Furthermore, UV absorbers with a benzotriazole skeleton are sometimes used, which have a skeleton (phenolic skeleton) with hydroxyl groups directly bonded to the benzene ring. The inventors have discovered that the yellowing of the interlayer is due to the reaction between the aforementioned hydroxyl groups of the UV absorber with the benzotriazole skeleton and the metal salt. Moreover, although reducing the metal salt content can suppress yellowing to some extent, it reduces the adhesion between the interlayer and the laminated glass component. In contrast, because the intermediate membrane of the present invention uses R at a specific position on the benzotriazole skeleton (in formula (X)). The ultraviolet absorber (X) having an arbitrary radical at position 1 can reduce the reactivity of the hydroxyl group directly bonded to the benzene ring with the metal salt. Therefore, the interlayer is less prone to yellowing. Furthermore, since a metal salt is used in the interlayer of the present invention, the adhesion between the interlayer and the laminated glass component can be improved. That is, although the intermediate film of the present invention contains ultraviolet absorbers with a benzotriazole skeleton and metal salts, it can still make yellowing less likely to occur and can improve the adhesion between the intermediate film and the laminated glass component. Furthermore, regarding the intermediate film of the present invention, when the intermediate film has a structure of two or more layers, the adhesion between the layers in the intermediate film can also be improved. The aforementioned intermediate film preferably comprises a layer containing an ultraviolet absorber (X) and a metal salt. When the intermediate film is a single-layer intermediate film with a one-layer structure, it comprises only a first layer containing an ultraviolet absorber (X) and a metal salt. When the intermediate film is a multilayer intermediate film with a structure of two or more layers, it preferably comprises at least one layer containing an ultraviolet absorber (X) and a metal salt. When the intermediate film is a multilayer intermediate film with a structure of two or more layers, it is more preferable that at least one surface layer of the intermediate film comprises an ultraviolet absorber (X) and a metal salt, and more preferably that both surface layers of the intermediate film comprise an ultraviolet absorber (X) and a metal salt. When the intermediate film is a multilayer intermediate film with a structure of two or more layers, the second layer is a surface layer of the intermediate film, and this second layer is more preferably a layer containing an ultraviolet absorber (X) and a metal salt. When the aforementioned intermediate film is a multilayer intermediate film having a structure of three or more layers, the third layer is the surface layer of the intermediate film, and the third layer is preferably a layer containing an ultraviolet absorber (X) and a metal salt. When the aforementioned intermediate film is a multilayer intermediate film having a structure of two or more layers, it is preferable that all layers of the intermediate film are layers containing an ultraviolet absorber (X) and a metal salt. Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. Figure 1 is a schematic cross-sectional view of the interlayer film for laminated glass according to the first embodiment of the present invention. Figure 1 shows a cross-section of the interlayer film 11 in the thickness direction. The interlayer film 11 shown in Figure 1 is a multilayer interlayer film having a structure of two or more layers. The interlayer film 11 is used to obtain laminated glass. The interlayer film 11 is an interlayer film for laminated glass. The interlayer film 11 includes a first layer 1, a second layer 2, and a third layer 3. The second layer 2 is disposed on the first surface 1a of the first layer 1 and laminated. The third layer 3 is disposed on the second surface 1b of the first layer 1 opposite to the first surface 1a and laminated. The first layer 1 is an interlayer. The second layer 2 and the third layer 3 are protective layers, which are surface layers in this embodiment. The first layer 1 is disposed and sandwiched between the second layer 2 and the third layer 3. Therefore, the interlayer film 11 has a multilayer structure (second layer 2 / first layer 1 / third layer 3) in which the second layer 2, the first layer 1, and the third layer 3 are sequentially laminated. Layer 1 contains an ultraviolet absorber (X) and a metal salt. Layer 2 contains an ultraviolet absorber (X) and a metal salt. Layer 3 contains an ultraviolet absorber (X) and a metal salt. In the intermediate film 11, each layer of the intermediate film 11 contains an ultraviolet absorber (X) and a metal salt. Furthermore, other layers may be disposed between the second layer 2 and the first layer 1, and between the first layer 1 and the third layer 3. Examples of other layers include layers containing polyethylene terephthalate. Preferably, the second layer 2 and the first layer 1, and the first layer 1 and the third layer 3 are directly laminated. Figure 2 is a cross-sectional view schematically illustrating the intermediate film for laminated glass according to the second embodiment of the present invention. Figure 2 shows a cross-section of the intermediate film 11A in the thickness direction. The interlayer 11A shown in Figure 2 is a single-layer interlayer with a one-layer structure. Interlayer 11A is the first layer. Interlayer 11A is used to obtain laminated glass. Interlayer 11A is an interlayer for laminated glass. Interlayer 11A contains an ultraviolet absorber (X) and a metal salt. Hereinafter, details of the first layer, the second layer and the third layer constituting the intermediate film of the present invention, as well as details of the components contained in the first layer, the second layer and the third layer, will be described. <Ultraviolet absorber represented by formula (X) (ultraviolet absorber (X))> The above-mentioned intermediate film contains ultraviolet absorber (X). The above-mentioned intermediate film has a layer containing ultraviolet absorber (X). The ultraviolet absorber (X) is the ultraviolet absorber represented by the following formula (X). The above-mentioned first layer preferably contains ultraviolet absorber (X). The above-mentioned second layer preferably contains ultraviolet absorber (X). The above-mentioned third layer preferably contains ultraviolet absorber (X). Only one type of ultraviolet absorber (X) may be used, or two or more types may be used together. Furthermore, the ultraviolet absorber (X) contained in the above-mentioned first layer, the ultraviolet absorber (X) contained in the above-mentioned second layer, and the ultraviolet absorber (X) contained in the above-mentioned third layer may be the same or different. [Chemistry 6] In the above formula (X), R 1 represents any basis, R 2~R 8 represents a hydrogen atom, an atom other than a hydrogen atom, or any radical. In the above formula (X), R The group is preferably composed of 1 or more carbon atoms, more preferably 3 or more carbon atoms, and even more preferably 20 or fewer carbon atoms, and more preferably 10 or fewer carbon atoms. In this case, the reactivity of the hydroxyl groups directly bonded to the benzene ring in the ultraviolet absorber (X) with the metal salt can be further reduced, thus making the yellowing change less likely to occur. In the above formula (X), R 1 is preferably alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. In formula (X) above, R 1 is preferably propyl, a group represented by formula (R11) below, or a group represented by formula (R12) below. In this case, the reactivity of the hydroxyl group directly bonded to the benzene ring in the ultraviolet absorber (X) with the metal salt can be further reduced, thus making yellowing less likely to occur. [Chemistry 7] In the above formula (R11), * indicates the bond position with the carbon atom that constitutes the benzene ring. [Chemistry 8] In the above formula (R12), * indicates the bond position with the carbon atom that constitutes the benzene ring. In the above formula (X), R 2 is preferably a hydrogen atom, alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. From the viewpoint of being less prone to yellowing, in the above formula (X), R... 2 is preferably alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. From the perspective of balancing the availability of the ultraviolet absorber (X) with its yellowing inhibition properties, in the above formula (X), R... 2 is preferably a hydrogen atom. In the above formula (X), R 3. Preferably, the carbon atom has 1 or more carbon atoms, more preferably 3 or more carbon atoms, and even more preferably 30 or fewer carbon atoms, more preferably 20 or fewer carbon atoms, and even more preferably 10 or fewer carbon atoms. In this case, higher UV absorption performance can be maintained, and yellowing is less likely to occur. In the above formula (X), R 3 is preferably alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. In formula (X) above, R 3 is preferably propyl, the group represented by formula (R11) above, or the group represented by formula (R12) above. In this case, the reactivity of the hydroxyl group directly bonded to the benzene ring in the ultraviolet absorber (X) with the metal salt can be further reduced, thus making yellowing less likely to occur. In the above formula (X), R 4 is preferably a hydrogen atom, alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. From the viewpoint of being less prone to yellowing, in the above formula (X), R... 4 is preferably alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. From the perspective of balancing the availability of the ultraviolet absorber (X) with its yellowing inhibition properties, in the above formula (X), R... 4 is preferably hydrogen atoms. In the above formula (X), R 5 is preferably a hydrogen atom, alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. From the viewpoint of being less prone to yellowing, in the above formula (X), R... 5 is preferably alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. From the perspective of balancing the availability of the ultraviolet absorber (X) with its yellowing inhibition properties, in the above formula (X), R... 5 is preferably a hydrogen atom. In the above formula (X), R 6 is preferably a hydrogen atom, alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. From the viewpoint of being less prone to yellowing, in the above formula (X), R... 6 is preferably alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. From the perspective of balancing the availability of the ultraviolet absorber (X) with its yellowing inhibition properties, in the above formula (X), R... 6 is preferably a hydrogen atom. In the above formula (X), R 7 is preferably a hydrogen atom, alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. From the viewpoint of being less prone to yellowing, in the above formula (X), R... 7 is preferably alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. From the perspective of balancing the availability of the ultraviolet absorber (X) with its yellowing inhibition properties, in the above formula (X), R... 7 is preferably a hydrogen atom. In the above formula (X), R 8 is preferably a hydrogen atom, alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. From the viewpoint of being less prone to yellowing, in the above formula (X), R... 8 is preferably alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. From the perspective of balancing the availability of the ultraviolet absorber (X) with its yellowing inhibition properties, in the above formula (X), R... 8 is preferably a hydrogen atom. The ultraviolet absorber (X) is preferably an ultraviolet absorber represented by the formula (X1) below, and more preferably an ultraviolet absorber represented by the formula (X1) below. In this case, higher ultraviolet absorption performance can be maintained, and yellowing is less likely to occur. [Chemistry 9] In the above formula (X1), R 1 represents any basis, R 3 indicates a base with 1 or more carbon atoms, R 6 represents a hydrogen atom or a halogen atom. In the above formula (X1), R The group is preferably composed of 1 or more carbon atoms, more preferably 3 or more carbon atoms, and even more preferably 20 or fewer carbon atoms, and more preferably 10 or fewer carbon atoms. In this case, the reactivity of the hydroxyl groups directly bonded to the benzene ring in the ultraviolet absorber (X) with the metal salt can be further reduced, thus making the yellowing change less likely to occur. In the above formula (X1), R 1 is preferably alkyl, aryl, alkoxy, aryloxy, acetoxy, alkylamino, aniline, acetamino, alkylsulfonamide, arylsulfonamide, alkylthio, or arylthio. In the above formula (X1), R 1 is preferably propyl, the group represented by formula (R11) above, or the group represented by formula (R12) above. In this case, the reactivity of the hydroxyl group directly bonded to the benzene ring in the ultraviolet absorber (X) with the metal salt can be further reduced, thus making yellowing less likely to occur. In the above formula (X1), R 3. Preferably, the carbon group has 1 or more carbon atoms, more preferably 30 or fewer carbon atoms, and even more preferably 10 or fewer carbon atoms. In this case, higher UV absorption performance can be maintained, and yellowing is less likely to occur. In the above formula (X1), R 6 is preferably a hydrogen atom or a chlorine atom. In this case, higher ultraviolet absorption performance can be maintained, and yellowing is less likely to occur. The ultraviolet absorber (X) is preferably an ultraviolet absorber represented by formula (X11), formula (X12), or formula (X13) below, and more preferably an ultraviolet absorber represented by formula (X11), formula (X12), or formula (X13) below. In this case, higher ultraviolet absorption performance can be maintained, and yellowing is less likely to occur. [Chemistry 10] [Chemistry 11] [Chemistry 12] The molecular weight of the ultraviolet absorber (X) is preferably 350 or higher, more preferably 355 or higher, even more preferably 380 or higher, and preferably 600 or lower, more preferably 500 or lower. If the molecular weight of the ultraviolet absorber (X) is above the lower limit and below the upper limit mentioned above, it can maintain a high ultraviolet absorption performance and is less prone to yellowing. Commercially available ultraviolet absorbers (X) include: BASF's "Tinuvin 234" and "Tinuvin 640", Rianlon's "RIASORB UV-234" and "RIASORB UV-928", Everlight Chemical's "Eversorb 88" and "Eversorb 89", Kyocera Pharmaceuticals' "Viosorb 234", Songwon's "SONGSORB 2340" and "SONGSORB 9280", Eutec's "Eusorb UV-234", and Chitec's "CHIGUARD 234" and "CHIGUARD 5228". In 100% by weight of the layer containing ultraviolet absorber (X) (the first layer, the second layer, or the third layer), the content of ultraviolet absorber (X) is preferably 0.1% by weight or more, more preferably 0.2% by weight or more, further preferably 0.3% by weight or more, particularly preferably 0.4% by weight or more, and preferably 7% by weight or less, more preferably 6% by weight or less, further preferably 5% by weight or less, and particularly preferably 4% by weight or less. If the content of ultraviolet absorber (X) is at or above the aforementioned lower limit, the ultraviolet transmittance (Tuv) of the interlayer can be further reduced, and even with long-term use of the interlayer and laminated glass, the decrease in visible light transmittance can be further suppressed. In particular, by making the content of ultraviolet absorber (X) 0.1% by weight or more in 100% by weight of the layer containing ultraviolet absorber (X), the decrease in visible light transmittance can be significantly suppressed even with long-term use of the interlayer and laminated glass. If the content of ultraviolet absorber (X) is below the above-mentioned upper limit, the dispersibility of ultraviolet absorber (X) in the layer containing ultraviolet absorber (X) can be further improved. In the aforementioned 100% by weight of the interlayer film, the content of ultraviolet absorber (X) is preferably 0.1% by weight or more, more preferably 0.2% by weight or more, further preferably 0.3% by weight or more, particularly preferably 0.4% by weight or more, and preferably 7% by weight or less, more preferably 6% by weight or less, further preferably 5% by weight or less, and particularly preferably 4% by weight or less. If the content of ultraviolet absorber (X) is at or above the aforementioned lower limit, the ultraviolet transmittance (Tuv) of the interlayer film can be further reduced, and even with long-term use of the interlayer film and laminated glass, the decrease in visible light transmittance can be further suppressed. In particular, by making the content of ultraviolet absorber (X) in the aforementioned 100% by weight of the interlayer film 0.1% by weight or more, even with long-term use of the interlayer film and laminated glass, the decrease in visible light transmittance can be significantly suppressed. If the content of ultraviolet absorber (X) is at or below the aforementioned upper limit, the dispersibility of ultraviolet absorber (X) in the aforementioned interlayer film can be further improved. Relative to 100 parts by weight of thermoplastic resin in the layer containing ultraviolet absorber (X) (layer 1, layer 2, or layer 3), the content of ultraviolet absorber (X) in the layer containing ultraviolet absorber (X) is preferably 0.1 parts by weight or more, more preferably 0.2 parts by weight or more, more preferably 0.3 parts by weight or more, and preferably 3 parts by weight or less, more preferably 2.5 parts by weight or less, and more preferably 2 parts by weight or less. If the content of ultraviolet absorber (X) is above the aforementioned lower limit, the ultraviolet transmittance (Tuv) of the interlayer can be further reduced, and even with long-term use of the interlayer and laminated glass, the decrease in visible light transmittance can be further suppressed. If the content of ultraviolet absorber (X) is below the aforementioned upper limit, the dispersibility of ultraviolet absorber (X) in the layer containing ultraviolet absorber (X) can be further improved. (Metal Salt) The aforementioned interlayer contains a metal salt. The aforementioned interlayer has a layer containing a metal salt. The aforementioned first layer preferably contains the aforementioned metal salt. The aforementioned second layer preferably contains the aforementioned metal salt. The aforementioned third layer preferably contains the aforementioned metal salt. The aforementioned layer containing the ultraviolet absorber (X) preferably contains the aforementioned metal salt. By using the aforementioned metal salt, the adhesion between the interlayer and laminated glass components such as glass plates, or the adhesion between the layers in the interlayer, can be easily controlled. Only one type of metal salt may be used, or two or more types may be used together. Furthermore, the metal salt contained in the aforementioned first layer, the metal salt contained in the aforementioned second layer, and the metal salt contained in the aforementioned third layer may be the same or different. The aforementioned metal salt is preferably an alkali metal salt or an alkaline earth metal salt. In this case, it is easy to control the adhesion between the interlayer and the laminated glass component, or the adhesion between the layers in the interlayer. Furthermore, alkaline earth metals refer to the six metals Be, Mg, Ca, Sr, Ba, and Ra. The aforementioned metal salt preferably contains at least one metal selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, and Ba. The metal salt contained in the intermediate film preferably contains at least one metal selected from K and Mg, and more preferably contains Mg. By including Mg in the aforementioned metal salt, collision safety under low water content conditions can be improved. The aforementioned metal salt is preferably a magnesium salt (P) containing an organic acid with a branched structure. In this case, it is easy to control the adhesion between the interlayer and laminated glass components such as the glass plate, or the adhesion between the layers in the interlayer. The magnesium salt (P) of the organic acid with a branched structure is preferably a magnesium salt of a carboxylic acid with a branched structure. In this case, it is easier to control the adhesion between the interlayer and laminated glass components such as the glass plate, or the adhesion between the layers in the interlayer. The aforementioned metal salt is preferably a metal salt (Q) containing an organic acid having 2 to 8 carbon atoms, which is a metal salt other than a magnesium salt of an organic acid with a branched structure. The aforementioned metal salt (Q) of an organic acid having 2 to 8 carbon atoms is different from the aforementioned magnesium salt (P) of an organic acid with a branched structure. In this case, it is also easier to control the adhesion between the interlayer and laminated glass components such as the glass plate, or the adhesion between the layers in the interlayer. The metal salt (Q) of the organic acid with 2 to 8 carbon atoms is preferably a magnesium or potassium salt of the organic acid with 2 to 8 carbon atoms. In this case, it is easier to control the adhesion between the interlayer and the laminated glass components such as the glass plate, or the adhesion between the layers in the interlayer. Furthermore, the aforementioned metal salt is preferably a magnesium salt (P) containing the aforementioned organic acid with a branched structure and a metal salt (Q) containing the aforementioned organic acid with 2 to 8 carbon atoms. Furthermore, as the aforementioned metal salts, alkali metal salts of organic acids having 2 to 16 carbon atoms and alkaline earth metal salts of organic acids having 2 to 16 carbon atoms can be used. The aforementioned metal salts may also include magnesium carboxylate salts having 2 to 16 carbon atoms or potassium carboxylate salts having 2 to 16 carbon atoms. Examples of magnesium carboxylate salts with 2 to 16 carbon atoms and potassium carboxylate salts with 2 to 16 carbon atoms include: magnesium acetate, potassium acetate, magnesium propionate, potassium propionate, magnesium 2-ethylbutyrate, potassium 2-ethylbutyrate, magnesium 2-ethylhexanoate, and potassium 2-ethylhexanoate. In the layer containing the ultraviolet absorber (X) and the metal salt, the weight ratio of the metal content in the metal salt to the ultraviolet absorber (X) content (metal content in the metal salt / ultraviolet absorber (X) content) is preferably 0.1 or more, more preferably 1.5 or more, further preferably 4 or more, particularly preferably 5 or more, and preferably 50 or less, more preferably 35 or less. If the weight ratio (metal content in the metal salt / ultraviolet absorber (X) content) is above the lower limit and below the upper limit, the effects of the present invention can be more effectively achieved. The total content of Mg and K in the interlayer containing the aforementioned metal salt, or in the layers containing the aforementioned metal salt (the first layer, the second layer, the third layer, or the layer containing the ultraviolet absorber (X)), is preferably 5 ppm or more, more preferably 10 ppm or more, and even more preferably 20 ppm or more, preferably 300 ppm or less, more preferably 250 ppm or less, and even more preferably 200 ppm or less. If the total content of Mg and K is above the aforementioned lower limit and below the aforementioned upper limit, the adhesion between the interlayer and the laminated glass component (glass plate, etc.) or the adhesion between the layers in the interlayer can be better controlled. The content of Mg in the intermediate film containing the above-mentioned metal salt, or in the layer containing the above-mentioned metal salt (the first layer, the second layer, the third layer, or the layer containing the ultraviolet absorber (X)) is preferably 5 ppm or more, more preferably 10 ppm or more, and even more preferably 20 ppm or more, and preferably 300 ppm or less, more preferably 250 ppm or less, and even more preferably 200 ppm or less. The contents of Mg and K, as well as the Mg content, can be determined based on the amount of metal salts contained in each layer, or by measuring them using an ICP (Inductively Coupled Plasma) luminescence analyzer. The interlayer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (0)). The interlayer preferably contains a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (0)) as the thermoplastic resin (0). The first layer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (1)). The first layer preferably contains a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (1)) as the thermoplastic resin (1). The second layer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (2)). The second layer preferably contains a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (2)) as the thermoplastic resin (2). The third layer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (3)). The third layer described above preferably contains a polyethylene acetal resin (hereinafter, sometimes referred to as polyethylene acetal resin (3)) as a thermoplastic resin (3). The layer containing the ultraviolet absorber (X) described above preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (4)). The layer containing the ultraviolet absorber (X) described above preferably contains a polyethylene acetal resin (hereinafter, sometimes referred to as polyethylene acetal resin (4)) as a thermoplastic resin (4). The thermoplastic resin (1), the thermoplastic resin (2), the thermoplastic resin (3), and the thermoplastic resin (4) described above may be the same or different. For the purpose of further improving sound insulation, the thermoplastic resin (1) described above is preferably different from the thermoplastic resin (2) and the thermoplastic resin (3) described above. The polyethylene acetal resin (1), the polyethylene acetal resin (2), the polyethylene acetal resin (3), and the polyethylene acetal resin (4) described above may be the same or different. For the purpose of further improving sound insulation, the aforementioned polyvinyl acetal resin (1) is preferably different from the aforementioned polyvinyl acetal resin (2) and the aforementioned polyvinyl acetal resin (3). Each of the aforementioned thermoplastic resin (0), the aforementioned thermoplastic resin (1), the aforementioned thermoplastic resin (2), the aforementioned thermoplastic resin (3), and the aforementioned thermoplastic resin (4) may be used in combination with only one type, or two or more types may be used in combination. Each of the aforementioned polyvinyl acetal resin (0), the aforementioned polyvinyl acetal resin (1), the aforementioned polyvinyl acetal resin (2), the aforementioned polyvinyl acetal resin (3), and the aforementioned polyvinyl acetal resin (4) may be used in combination with only one type, or two or more types may be used in combination. Examples of the aforementioned thermoplastic resins include: polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, polyurethane resin, (meth)acrylic acid resin, polyolefin resin, ionomer resin, and polyvinyl alcohol resin. Other thermoplastic resins may also be used. The aforementioned polyethylene acetal resin can be manufactured, for example, by acetalizing polyvinyl alcohol (PVA) using an aldehyde. Preferably, the aforementioned polyethylene acetal resin is an acetalized form of polyvinyl alcohol. The aforementioned polyvinyl alcohol can be obtained, for example, by saponifying polyvinyl acetate. The degree of saponification of the aforementioned polyvinyl alcohol is typically in the range of 70 mol% to 99.9 mol%. The average degree of polymerization of the aforementioned polyvinyl alcohol (PVA) is preferably 200 or higher, more preferably 500 or higher, further preferably 1500 or higher, further preferably 1600 or higher, especially preferably 2600 or higher, most preferably 2700 or higher, and preferably 5000 or lower, more preferably 4000 or lower, and further preferably 3500 or lower. If the aforementioned average degree of polymerization is above the lower limit, the penetration resistance of the laminated glass becomes higher. If the aforementioned average degree of polymerization is below the upper limit, the formation of the interlayer becomes easier. The average degree of polymerization of the above-mentioned polyvinyl alcohol can be determined by following the method in JIS K6726 "Test Method for Polyvinyl Alcohol". The number of carbon atoms in the acetal group of the aforementioned polyethylene acetal resin is not particularly limited. The aldehyde used in the manufacture of the aforementioned polyethylene acetal resin is not particularly limited. Preferably, the number of carbon atoms in the acetal group of the aforementioned polyethylene acetal resin is 3 to 5, more preferably 3 or 4. If the number of carbon atoms in the acetal group of the aforementioned polyethylene acetal resin is 3 or more, the glass transition temperature of the intermediate film is sufficiently reduced. The number of carbon atoms in the acetal group of the aforementioned polyethylene acetal resin may also be 4 or 5. There are no particular limitations on the aldehydes mentioned above. Generally, aldehydes with 1 to 10 carbon atoms are suitable. Examples of aldehydes with 1 to 10 carbon atoms include: propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-pentanaldehyde, 2-ethylbutyraldehyde, n-hexanaldehyde, n-octanaldehyde, n-nonanaldehyde, n-decanaldehyde, formaldehyde, acetaldehyde, and benzaldehyde. Propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexanaldehyde, or n-pentanaldehyde are preferred, more preferably propionaldehyde, n-butyraldehyde, or isobutyraldehyde, and even more preferably n-butyraldehyde. Only one of the above aldehydes may be used, or two or more may be used in combination. The hydroxyl content (hydroxyl amount) of the aforementioned polyvinyl acetal resin (0) is preferably 15 moles or more, more preferably 18 moles or more, and preferably 40 moles or less, more preferably 35 moles or less. If the hydroxyl content is above the lower limit, the adhesion of the interlayer becomes higher. Furthermore, if the hydroxyl content is below the upper limit, the flexibility of the interlayer is improved, and the processing of the interlayer becomes easier. The hydroxyl content (hydroxyl amount) of the aforementioned polyvinyl acetal resin (1) is preferably 17 mol% or more, more preferably 20 mol% or more, further preferably 22 mol% or more, and preferably 28 mol% or less, more preferably 27 mol% or less, further preferably 25 mol% or less, and especially preferably 24 mol% or less. If the hydroxyl content is above the lower limit, the mechanical strength of the interlayer becomes higher. In particular, if the hydroxyl content of the aforementioned polyvinyl acetal resin (1) is 20 mol% or more, the reaction efficiency is higher and the productivity is excellent; and if it is 28 mol% or less, the sound insulation of the laminated glass becomes higher. Furthermore, if the hydroxyl content is below the upper limit, the flexibility of the interlayer is improved, and the processing of the interlayer becomes easier. When the layer containing the ultraviolet absorber (X) is not the surface layer of the intermediate film, the preferred range of the hydroxyl content of the above-mentioned polyethylene acetal resin (4) is the same as the preferred range of the hydroxyl content of the above-mentioned polyethylene acetal resin (1). The hydroxyl content (hydroxyl amount) of the above-mentioned polyethylene acetal resin (2) and polyethylene acetal resin (3) is preferably 25 mol% or more, more preferably 28 mol% or more, more preferably 30 mol% or more, further preferably 31.5 mol% or more, further preferably 32 mol% or more, and especially preferably 33 mol% or more. The hydroxyl content (hydroxyl amount) of the above-mentioned polyethylene acetal resin (2) and polyethylene acetal resin (3) is preferably 38 mol% or less, more preferably 37 mol% or less, further preferably 36.5 mol% or less, and especially preferably 36 mol% or less. If the hydroxyl content is above the lower limit, the adhesion of the interlayer becomes higher. Furthermore, if the hydroxyl content is below the upper limit, the flexibility of the interlayer is improved, and the processing of the interlayer becomes easier. When the layer containing the ultraviolet absorber (X) is the surface layer of the intermediate film, the preferred range of the hydroxyl content of the above-mentioned polyethylene acetal resin (4) is the same as the preferred range of the hydroxyl content of the above-mentioned polyethylene acetal resin (2) and the above-mentioned polyethylene acetal resin (3). From the viewpoint of further improving sound insulation, the hydroxyl content of the aforementioned polyethylene acetal resin (1) is preferably lower than that of the aforementioned polyethylene acetal resin (2). From the viewpoint of further improving sound insulation, the hydroxyl content of the aforementioned polyethylene acetal resin (1) is preferably lower than that of the aforementioned polyethylene acetal resin (3). Let the absolute value of the difference between the hydroxyl content of the aforementioned polyethylene acetal resin (1) and the hydroxyl content of the aforementioned polyethylene acetal resin (2) be defined as absolute value A, and let the absolute value of the difference between the hydroxyl content of the aforementioned polyethylene acetal resin (1) and the hydroxyl content of the aforementioned polyethylene acetal resin (3) be defined as absolute value B. From the viewpoint of further improving sound insulation, absolute values ​​A and B are preferably 1 mol% or more, more preferably 5 mol% or more, more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. Absolute values ​​A and B are preferably 20 mol% or less. When the layer containing the ultraviolet absorber (X) is not the surface layer of the intermediate film, from the viewpoint of further improving sound insulation, the hydroxyl content of the polyethylene acetal resin (4) is preferably lower than the hydroxyl content of the polyethylene acetal resin (2). When the layer containing the ultraviolet absorber (X) is not the surface layer of the intermediate film, from the viewpoint of further improving sound insulation, the hydroxyl content of the polyethylene acetal resin (4) is preferably lower than the hydroxyl content of the polyethylene acetal resin (3). The absolute value of the difference between the hydroxyl content of the polyethylene acetal resin (4) and the hydroxyl content of the polyethylene acetal resin (2) is set as absolute value C, and the absolute value of the difference between the hydroxyl content of the polyethylene acetal resin (4) and the hydroxyl content of the polyethylene acetal resin (3) is set as absolute value D. From the perspective of further improving sound insulation, the absolute values ​​of C and D are preferably 1 mol% or more, more preferably 5 mol% or more, further preferably 9 mol% or more, especially preferably 10 mol% or more, and most preferably 12 mol% or more. The absolute values ​​of C and D are preferably 20 mol% or less. When the layer containing the ultraviolet absorber (X) is the surface layer of the intermediate film, from the viewpoint of further improving sound insulation, the hydroxyl content of the polyethylene acetal resin (1) is preferably lower than the hydroxyl content of the polyethylene acetal resin (4). When the layer containing the ultraviolet absorber (X) is the surface layer of the intermediate film, from the viewpoint of further improving sound insulation, the absolute value of the difference between the hydroxyl content of the polyethylene acetal resin (1) and the hydroxyl content of the polyethylene acetal resin (4) is preferably 1 mol% or more, more preferably 5 mol% or more, more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. The absolute value of the difference between the hydroxyl content of the polyethylene acetal resin (1) and the hydroxyl content of the polyethylene acetal resin (4) is preferably 20 mol% or less. The hydroxyl content of the aforementioned polyvinyl acetal resin is expressed as a percentage, calculated by dividing the amount of ethylated material with hydroxyl groups by the total amount of ethylated material in the main chain. The amount of ethylated material with hydroxyl groups can be determined, for example, according to JIS K6728 "Test Method for Polyvinyl Butyral". The degree of acetylation (acetylated content) of the aforementioned polyethylene acetal resin (0) is preferably 0.1 mol% or more, more preferably 0.3 mol% or more, and even more preferably 0.5 mol% or more, and preferably 30 mol% or less, more preferably 25 mol% or less, and even more preferably 20 mol% or less. If the degree of acetylation is above or below the aforementioned lower limit, the compatibility between the polyethylene acetal resin and the plasticizer is improved. If the degree of acetylation is below or below the aforementioned upper limit, the moisture resistance of the interlayer and the laminated glass is improved. The degree of acetylation (acetylated content) of the aforementioned polyethylene acetal resin (1) is preferably 0.01 mol% or more, more preferably 0.1 mol% or more, further preferably 7 mol% or more, further preferably 9 mol% or more, and preferably 30 mol% or less, more preferably 25 mol% or less, further preferably 24 mol% or less, and especially preferably 20 mol% or less. If the degree of acetylation is above or below the aforementioned lower limit, the compatibility between the polyethylene acetal resin and the plasticizer is improved. If the degree of acetylation is below or below the aforementioned upper limit, the moisture resistance of the interlayer and the laminated glass is improved. In particular, if the degree of acetylation of the aforementioned polyethylene acetal resin (1) is 0.1 mol% or more and 25 mol% or less, the penetration resistance is excellent. When the layer containing the ultraviolet absorber (X) is not the surface layer of the intermediate film, the preferred range of the degree of acetylation of the above-mentioned polyethylene acetal resin (4) is the same as the preferred range of the degree of acetylation of the above-mentioned polyethylene acetal resin (1). The degree of acetylation (acetylated content) of each of the above-mentioned polyethylene acetal resin (2) and polyethylene 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. If the degree of acetylation is above or below the lower limit, the compatibility between the polyethylene acetal resin and the plasticizer is improved. If the degree of acetylation is below or below the upper limit, the moisture resistance of the interlayer and the laminated glass is improved. When the layer containing the ultraviolet absorber (X) is the surface layer of the intermediate film, the preferred range of the degree of acetylation of the above-mentioned polyethylene acetal resin (4) is the same as the preferred range of the degree of acetylation of the above-mentioned polyethylene acetal resin (2) and the above-mentioned polyethylene acetal resin (3). The degree of acetylation mentioned above is expressed as a percentage, calculated by dividing the amount of ethylated groups bonded with acetyl groups by the total amount of ethylated groups in the main chain. The amount of ethylated groups bonded with acetyl groups can be determined, for example, according to JIS K6728 "Test Method for Polyvinyl Butyral". The degree of acetalization of the aforementioned polyethylene acetal resin (0) (in the case of polyvinyl butyral resin, the degree of butyraldehyde) 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. If the degree of acetalization is above or below the aforementioned lower limit, the compatibility between the polyethylene acetal resin and the plasticizer is improved. If the degree of acetalization is below or below the aforementioned upper limit, the reaction time required for manufacturing the polyethylene acetal resin is shortened. The degree of acetalization of the aforementioned polyethylene acetal resin (1) (in the case of polyvinyl butyral resin, the degree of butyraldehyde) 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. If the degree of acetalization is above or below the aforementioned lower limit, the compatibility between the polyethylene acetal resin and the plasticizer is improved. If the degree of acetalization is below or below the aforementioned upper limit, the reaction time required for manufacturing the polyethylene acetal resin is shortened. When the layer containing the ultraviolet absorber (X) is not the surface layer of the intermediate film, the preferred range of the degree of acetalization of the above-mentioned polyethylene acetal resin (4) is the same as the preferred range of the degree of acetalization of the above-mentioned polyethylene acetal resin (1). The degree of acetalization (or butyraldehyde degree in the case of polyvinyl butyral resin) of the above-mentioned polyethylene acetal resin (2) and the above-mentioned polyethylene acetal resin (3) is preferably 55 mol% or more, more preferably 60 mol% or more, and more preferably 75 mol% or less, and more preferably 71 mol% or less. If the degree of acetalization is above or below the lower limit, the compatibility between the polyethylene acetal resin and the plasticizer is improved. If the degree of acetalization is below or below the upper limit, the reaction time required for manufacturing the polyethylene acetal resin is shortened. When the layer containing the ultraviolet absorber (X) is the surface layer of the intermediate film, the preferred range of the degree of acetalization of the above-mentioned polyethylene acetal resin (4) is the same as the preferred range of the degree of acetalization of the above-mentioned polyethylene acetal resin (2) and the above-mentioned polyethylene acetal resin (3). The degree of acetalization is determined as follows: First, the total ethylened content of the main chain is subtracted from the ethylened content of hydroxyl-bonded groups and the ethylened content of acetyl-bonded groups. This value is then divided by the total ethylened content of the main chain to obtain the desired molar fraction. The degree of acetalization is expressed as a percentage. Furthermore, the aforementioned hydroxyl content (hydroxyl amount), degree of acetalization (butyraldehyde degree), and degree of acetylation are preferably calculated based on results obtained according to the method of JIS K6728 "Test Method for Polyvinyl Butyral". However, the determination based on ASTM D1396-92 can also be used. When the polyvinyl acetal resin is polyvinyl butyral resin, the aforementioned hydroxyl content (hydroxyl amount), degree of acetalization (butyraldehyde degree), and degree of acetylation can be calculated based on results obtained according to the method of JIS K6728 "Test Method for Polyvinyl Butyral". Of the 100% by weight of thermoplastic resin contained in the aforementioned interlayer film, the content of polyvinyl acetal resin is preferably 10% by weight or more, more preferably 30% by weight or more, further preferably 50% by weight or more, further preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. Of the 100% by weight of thermoplastic resin contained in the aforementioned interlayer film, the content of polyvinyl acetal resin is preferably less than 100% by weight. The main component (50% by weight or more) of the thermoplastic resin in the aforementioned interlayer film is preferably polyvinyl acetal resin. Of the 100% by weight of thermoplastic resin contained in the first layer described above, the content of polyvinyl acetal resin is preferably 10% by weight or more, more preferably 30% by weight or more, further preferably 50% by weight or more, further preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. Of the 100% by weight of thermoplastic resin contained in the first layer described above, the content of polyvinyl acetal resin is preferably less than 100% by weight. The main component (50% by weight or more) of the thermoplastic resin in the first layer described above is preferably polyvinyl acetal resin. Of the 100% by weight of thermoplastic resin contained in the second layer described above, the content of polyvinyl acetal resin is preferably 10% by weight or more, more preferably 30% by weight or more, further preferably 50% by weight or more, further preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. Of the 100% by weight of thermoplastic resin contained in the second layer described above, the content of polyvinyl acetal resin is preferably less than 100% by weight. The main component (50% by weight or more) of the thermoplastic resin in the second layer described above is preferably polyvinyl acetal resin. Of the 100% by weight of thermoplastic resin contained in the third layer described above, the content of polyvinyl acetal resin is preferably 10% by weight or more, more preferably 30% by weight or more, further preferably 50% by weight or more, further preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. Of the 100% by weight of thermoplastic resin contained in the third layer described above, the content of polyvinyl acetal resin is preferably less than 100% by weight. The main component (50% by weight or more) of the thermoplastic resin in the third layer described above is preferably polyvinyl acetal resin. Of the 100% by weight of thermoplastic resin contained in the aforementioned layer containing ultraviolet absorber (X), the content of polyvinyl acetal resin is preferably 10% by weight or more, more preferably 30% by weight or more, further preferably 50% by weight or more, further preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. Of the 100% by weight of thermoplastic resin contained in the aforementioned layer containing ultraviolet absorber (X), the content of polyvinyl acetal resin is preferably less than 100% by weight. The main component (50% by weight or more) of the thermoplastic resin in the aforementioned layer containing ultraviolet absorber (X) is preferably polyvinyl acetal resin. (Plasticizer) From the viewpoint of further improving the adhesion of the interlayer film, the interlayer film of the present invention preferably contains a plasticizer (hereinafter, sometimes referred to as plasticizer (0)). The first layer preferably contains a plasticizer (hereinafter, sometimes referred to as plasticizer (1)). The second layer preferably contains a plasticizer (hereinafter, sometimes referred to as plasticizer (2)). The third layer preferably contains a plasticizer (hereinafter, sometimes referred to as plasticizer (3)). The layer containing the ultraviolet absorber (X) preferably contains a plasticizer (hereinafter, sometimes referred to as plasticizer (4)). When the thermoplastic resin contained in the interlayer film is polyvinyl acetal resin, the interlayer film (each layer) preferably contains a plasticizer. The layer containing polyvinyl acetal resin preferably contains a plasticizer. There are no particular limitations on the plasticizers mentioned above. Previously known plasticizers may be used. Only one plasticizer may be used, or two or more may be used in combination. Examples of plasticizers mentioned above include: organic ester plasticizers such as monobasic and polybasic organic esters, organic phosphoric acid plasticizers, and organic phosphorous acid plasticizers. Organic ester plasticizers are preferred. Liquid plasticizers are also preferred. Examples of monobasic organic acid esters include glycol esters obtained by reacting a glycol with a monobasic organic acid. Examples of glycols include triethylene glycol, tetraethylene glycol, and tripropylene glycol. Examples of monobasic organic acids include butyric acid, isobutyric acid, hexanoic acid, 2-ethylbutyric acid, heptanoic acid, octanoic acid, 2-ethylhexanoic acid, nonanoic acid, decanoic acid, and benzoic acid. Examples of the aforementioned polybasic organic acid esters include ester compounds of polybasic organic acids and alcohols having a straight-chain or branched structure with 4 to 8 carbon atoms. Examples of the aforementioned polybasic organic acids include adipic acid, sebacic acid, and azelaic acid. Examples of the above-mentioned organic ester plasticizers include: triethylene glycol di(2-ethylpropionate), triethylene glycol di(2-ethylbutyrate), triethylene glycol di(2-ethylhexanoate), triethylene glycol dioctanoate, triethylene glycol di-n-octanoate, triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di(2-ethylbutyrate), 1,3-propanediol di(2-ethylbutyrate), 1,4-butanediol di(2-ethylbutyrate), and diethylene glycol di(2-ethylbutyric acid). These include esters, diethylene glycol di(2-ethylhexanoate), dipropylene glycol di(2-ethylbutyrate), triethylene glycol di(2-ethylvalerate), tetraethylene glycol di(2-ethylbutyrate), diethylene glycol dioctanoate, diethylene glycol dibenzoate, dipropylene glycol dibenzoate, dihexyl adipate, dioctyl adipate, hexyl adipate cyclohexyl adipate, a mixture of heptyl adipate and nonyl adipate, diisononyl adipate, diisodecyl adipate, heptyl adipate nonyl adipate, dibutyl sebacate, oil-modified sebacate esters, and mixtures of phosphate esters and adipates. Other organic ester plasticizers besides these can also be used as plasticizers. Furthermore, other adipates besides those mentioned above can also be used as adipates. Examples of organophosphate plasticizers mentioned above include: tributoxyethyl phosphate, isodecyl phosphate, phenyl phosphate, and triisopropyl phosphate. The plasticizer described above is preferably a diester plasticizer represented by the following formula (1). [Chemistry 13] In formula (1) above, R1 and R2 represent organogroups with 2 to 10 carbon atoms, R3 represents ethyl, isopropyl, or n-propyl, and p represents an integer from 3 to 10. R1 and R2 in formula (1) above are preferably organogroups with 5 to 10 carbon atoms, and more preferably organogroups with 6 to 10 carbon atoms. The aforementioned plasticizer preferably comprises triethylene glycol di(2-ethylhexanoate) (3GO), triethylene glycol di(2-ethylbutyrate) (3GH), or triethylene glycol di(2-ethylpropionate). More preferably, the aforementioned plasticizer comprises triethylene glycol di(2-ethylhexanoate) (3GO) or triethylene glycol di(2-ethylbutyrate) (3GH), and even more preferably, it comprises triethylene glycol di(2-ethylhexanoate) (3GO). The content (0) of the plasticizer (0) in the interlayer 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, more preferably 30 parts by weight or more, and preferably 100 parts by weight or less, more preferably 60 parts by weight or less, and more preferably 50 parts by weight or less. If the content (0) is above the lower limit, the penetration resistance of the laminated glass becomes higher. If the content (0) is below the upper limit, the transparency of the interlayer becomes higher. In the first layer described above, 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. If the content (1) is above or below the lower limit, the flexibility of the interlayer is improved, and the processing of the interlayer becomes easier. If the content (1) is below the upper limit, the penetration resistance of the laminated glass becomes higher. When the layer containing the ultraviolet absorber (X) is not the surface layer of the intermediate film, the preferred range of the content of the plasticizer (4) relative to 100 parts by weight of the thermoplastic resin (4) in the layer containing the ultraviolet absorber (X) is the same as the preferred range of the content (1). In the second layer described above, 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 described above, 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 preferably 5 parts by weight or more, more preferably 10 parts by weight or more, more preferably 15 parts by weight or more, 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 preferably 45 parts by weight or less, more preferably 40 parts by weight or less, 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. If the contents (2) and (3) are at or above the lower limit described above, the flexibility of the interlayer is improved, and the processing of the interlayer becomes easier. If the above contents (2) and (3) are below the above upper limit, the penetration resistance of the laminated glass becomes higher. When the layer containing the ultraviolet absorber (X) is the surface layer of the intermediate film, the preferred range of the content of the plasticizer (4) relative to 100 parts by weight of the thermoplastic resin (4) in the layer containing the ultraviolet absorber (X) (hereinafter, sometimes referred to as the content (4)) is the same as the preferred range of the content (2) and the content (3) above. In order to improve the sound insulation of laminated glass, it is preferable that the above content (1) is greater than the above content (2), and it is even more preferable that the above content (1) is greater than the above content (3). In the case where the layer containing ultraviolet absorber (X) is not the surface layer of the intermediate film, in order to improve the sound insulation of the laminated glass, it is preferable that the content (4) is greater than the content (2), and it is preferable that the content (4) is greater than the content (3). When the layer containing ultraviolet absorber (X) is the surface layer of the intermediate film, in order to improve the sound insulation of the laminated glass, it is preferable that the content (1) is greater than the content (4). From the viewpoint of further improving the sound insulation of laminated glass, the absolute value of the difference between the above-mentioned content (2) and the above-mentioned content (1), and the absolute value of the difference between the above-mentioned content (3) and the above-mentioned content (1) are 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 above-mentioned content (2) and the above-mentioned content (1), and the absolute value of the difference between the above-mentioned content (3) and the above-mentioned content (1) are 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. When the layer containing the ultraviolet absorber (X) is not the surface layer of the interlayer, 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 (4), and the absolute value of the difference between the content (3) and the content (4) are 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 (4), and the absolute value of the difference between the content (3) and the content (4) are 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. When the layer containing the ultraviolet absorber (X) is the surface layer of the intermediate film, from the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the content (4) and the content (1) is 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 (4) and the content (1) is 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. (Insulating Material) The aforementioned intermediate film preferably contains an insulating material. The aforementioned first layer preferably contains an insulating material. The aforementioned second layer preferably contains an insulating material. The aforementioned third layer preferably contains an insulating material. The aforementioned layer containing the ultraviolet absorber (X) preferably contains an insulating material. Only one type of insulating material may be used, or two or more types may be used in combination. The aforementioned heat-insulating material preferably contains at least one component X selected from phthalocyanine compounds, naphthalene phthalocyanine compounds, and anthracene phthalocyanine compounds, or contains heat-insulating particles. In this case, the aforementioned heat-insulating material may also contain both component X and the aforementioned heat-insulating particles. Component X: The aforementioned intermediate film preferably contains at least one component X selected from phthalocyanine compounds, naphthyl phthalocyanine compounds, and anthracene phthalocyanine compounds. The aforementioned first layer preferably contains component X. The aforementioned second layer preferably contains component X. The aforementioned third layer preferably contains component X. The aforementioned layer containing ultraviolet absorber (X) preferably contains component X. Component X is a heat-insulating material. Component X may be used alone or in combination of two or more. The above-mentioned ingredient X is not particularly limited. As ingredient X, previously known phthalocyanine compounds, naphthalene phthalocyanine compounds, and anthracene phthalocyanine compounds may be used. Examples of the aforementioned component X include: phthalocyanines, phthalocyanine derivatives, naphthylphthalocyanines, naphthylphthalocyanine derivatives, anthracene phthalocyanines, and anthracene phthalocyanine derivatives. Preferably, the aforementioned phthalocyanine compounds and their derivatives each possess a phthalocyanine skeleton. Preferably, the aforementioned naphthylphthalocyanine compounds and their derivatives each possess a naphthylphthalocyanine skeleton. Preferably, the aforementioned anthracene phthalocyanine compounds and their derivatives each possess an anthracene phthalocyanine skeleton. From the viewpoint of further improving the thermal insulation properties of the interlayer and laminated glass, the aforementioned component X is preferably selected from at least one of the group consisting of phthalocyanine, phthalocyanine derivatives, naphthalene phthalocyanine and naphthalene phthalocyanine derivatives, and more preferably at least one of phthalocyanine and phthalocyanine derivatives. From the viewpoint of effectively improving thermal insulation and maintaining visible light transmittance at a higher level over a long period, the aforementioned component X preferably contains vanadium atoms or copper atoms. The aforementioned component X preferably contains vanadium atoms, and more preferably contains copper atoms. The aforementioned component X is more preferably at least one of phthalocyanine containing vanadium atoms or copper atoms and its derivatives. From the viewpoint of further improving the thermal insulation of the interlayer and laminated glass, the aforementioned component X preferably has a structural unit having oxygen atoms bonded to vanadium atoms. In the aforementioned 100% by weight of the intermediate film, or in the aforementioned 100% by weight of the layers containing component X (the first layer, the second layer, the third layer, or the layer containing ultraviolet absorber (X)), the content of component X is preferably 0.001% by weight or more, more preferably 0.005% by weight or more, further preferably 0.01% by weight or more, and particularly preferably 0.02% by weight or more. In the aforementioned 100% by weight of the intermediate film, or in the aforementioned 100% by weight of the layers containing component X (the first layer, the second layer, the third layer, or the layer containing ultraviolet absorber (X)), the content of component X is preferably 0.2% by weight or less, more preferably 0.1% by weight or less, further preferably 0.05% by weight or less, and particularly preferably 0.04% by weight or less. If the content of component X is above or below the aforementioned lower limit and below the aforementioned upper limit, the heat insulation performance is sufficiently improved, and the visible light transmittance is sufficiently improved. For example, the visible light transmittance can be made to be 70% or more. Heat-insulating particles: The intermediate film preferably contains heat-insulating particles. The first layer preferably contains the heat-insulating particles. The second layer preferably contains the heat-insulating particles. The third layer preferably contains the heat-insulating particles. The layer containing the ultraviolet absorber (X) preferably contains the heat-insulating particles. The heat-insulating particles are heat-insulating materials. By using heat-insulating particles, infrared rays (heat rays) can be effectively blocked. Only one type of heat-insulating particle can be used, or two or more types can be used together. From the viewpoint of further improving the thermal insulation performance of laminated glass, the aforementioned thermal insulation particles are preferably metal oxide particles. Specifically, the aforementioned thermal insulation particles are particles formed from metal oxides (metal oxide particles). Infrared radiation, with wavelengths longer than visible light (above 780 nm), has lower energy than ultraviolet radiation. However, infrared radiation has a greater thermal effect, releasing heat when absorbed by matter. Therefore, infrared radiation is often referred to as heat radiation. By using the aforementioned heat-insulating particles, infrared radiation (heat radiation) can be effectively blocked. Furthermore, heat-insulating particles refer to particles capable of absorbing infrared radiation. Specific examples of the aforementioned heat-insulating particles include: 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, sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, rubidium-doped tungsten oxide particles, tin-doped indium oxide particles (ITO particles), tin-doped zinc oxide particles, silicon-doped zinc oxide particles, and other metal oxide particles, or lanthanum hexaboride (LaB) 6) Particles, etc. Other heat-insulating particles may also be used. Due to their high heat-insulating properties, metal oxide particles are preferred, more preferably ATO particles, GZO particles, IZO particles, ITO particles, or tungsten oxide particles, especially ITO particles or tungsten oxide particles. In particular, due to their high heat-insulating properties and ease of availability, tin-doped indium oxide particles (ITO particles) are preferred, and tungsten oxide particles are also preferred. From the viewpoint of further improving the thermal insulation properties of the interlayer and laminated glass, tungsten oxide particles are preferably metal-doped tungsten oxide particles. The aforementioned "tungsten oxide particles" include metal-doped tungsten oxide particles. Specifically, examples of such 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. From the viewpoint of further improving the thermal insulation properties of the interlayer and laminated glass, cesium-doped tungsten oxide particles are particularly preferred. From the viewpoint of further improving the thermal insulation properties of the interlayer and laminated glass, the cesium-doped tungsten oxide particles are preferably of the formula: Cs 0.33 WO 3 represents tungsten oxide particles. The average particle size of the aforementioned heat-insulating 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. If the average particle size is above or below the aforementioned lower limit, the heat-insulating properties are sufficiently improved. If the average particle size is below the aforementioned upper limit, the dispersibility of the heat-insulating particles is improved. The "average particle size" mentioned above refers to the volume average particle size. The average particle size can be measured using a particle size distribution measuring device (such as the "UPA-EX150" manufactured by Nikkiso Corporation). In the aforementioned 100% by weight of the intermediate film, or in the aforementioned 100% by weight of the layers containing the aforementioned heat-insulating particles (the first layer, the second layer, the third layer, or the layer containing ultraviolet absorber (X)), the content of the aforementioned heat-insulating particles (especially the content of tungsten oxide particles) is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, further preferably 1% by weight or more, and particularly preferably 1.5% by weight or more. In the aforementioned 100% by weight of the intermediate film, or in the aforementioned 100% by weight of the layers containing the aforementioned heat-insulating particles (the first layer, the second layer, the third layer, or the layer containing ultraviolet absorber (X)), the content of the aforementioned heat-insulating particles (especially the content of tungsten oxide particles) is preferably 6% by weight or less, more preferably 5.5% by weight or less, further preferably 4% by weight or less, particularly preferably 3.5% by weight or less, and most preferably 3% by weight or less. If the content of the aforementioned heat-insulating particles is above or below the aforementioned lower limit and below the aforementioned upper limit, the heat insulation performance is sufficiently improved, and the visible light transmittance is sufficiently improved. (Antioxidant) The intermediate film preferably contains an antioxidant. The first layer preferably contains an antioxidant. The second layer preferably contains an antioxidant. The third layer preferably contains an antioxidant. The layer containing the ultraviolet absorber (X) preferably contains an antioxidant. Only one type of antioxidant may be used, or two or more may be used in combination. Examples of the aforementioned antioxidants include phenolic antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants. Phenolic antioxidants are antioxidants with a phenolic skeleton. Sulfur-based antioxidants are antioxidants containing sulfur atoms. Phosphorus-based antioxidants are antioxidants containing phosphorus atoms. The antioxidants mentioned above are preferably phenolic antioxidants or phosphorus-based antioxidants. Examples of phenolic antioxidants include: 2,6-di-tert-butyl-p-cresol (BHT), butylated hydroxyanisole (BHA), 2,6-di-tert-butyl-4-ethylphenol, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate stearate, 2,2'-methylenebis-(4-methyl-6-butylphenol), 2,2'-methylenebis-(4-ethyl-6-tert-butylphenol), 4,4'-butylene-bis-(3-methyl-6-tert-butylphenol), 1,1,3-tri- (2-Methyl-hydroxy-5-tert-butylphenyl)butane, tetra[methylene-3-(3',5'-butyl-4-hydroxyphenyl)propionate]methane, 1,3,3-tris-(2-methyl-4-hydroxy-5-tert-butylphenol)butane, 1,3,5-trimethyl-2,4,6-tris(3,5-ditert-butyl-4-hydroxybenzyl)benzene, bis(3,3'-tert-butylphenol)butyrate glycol ester, and bis(3-tert-butyl-4-hydroxy-5-methylphenylpropionate) ethylene glycol ester bis(oxyethylene), etc. One or more of these antioxidants are suitable for use. Examples of phosphorus-based antioxidants include: tridecyl phosphite, tri(tridecyl) phosphite, triphenyl phosphite, tri(nonylphenyl) phosphite, pentaerythritol bis(tridecyl)phosphite, pentaerythritol bis(decyl)phosphite, tri(2,4-di-tert-butylphenyl) phosphite, ethyl bis(2,4-di-tert-butyl-6-methylphenyl) phosphite, and 2,2'-methylenebis(4,6-di-tert-butyl-1-phenoxy)(2-ethylhexyloxy)phosphite. One or more of these antioxidants are suitable for use. Commercially available antioxidants mentioned above include, for example, BASF's "IRGANOX 245", BASF's "IRGAFOS 168", BASF's "IRGAFOS 38", Sumitomo Chemical Co., Ltd.'s "Sumilizer BHT", Sakai Chemical Co., Ltd.'s "H-BHT", and BASF's "IRGANOX 1010". To maintain high visible light transmittance of the interlayer and laminated glass over a long period, the content of the antioxidant in 100% by weight of the interlayer or in 100% by weight of the layers containing the antioxidant (the first, second, or third layer, or the layer containing the ultraviolet absorber (X)) is preferably 0.03% by weight or more, and more preferably 0.1% by weight or more. Furthermore, since the effect of adding antioxidants can become saturated, the content of the antioxidant in 100% by weight of the interlayer or in 100% by weight of the layers containing the antioxidant is preferably 2% by weight or less. (Other Components) The aforementioned intermediate film, the aforementioned first layer, the aforementioned second layer, the aforementioned third layer, and the aforementioned layer containing the ultraviolet absorber (X) may also contain other components besides those mentioned above, as needed. Examples of such other components include: ultraviolet absorbers other than ultraviolet absorber (X), colorants (pigments and dyes, etc.), coupling agents, dispersants, surfactants, flame retardants, antistatic agents, adhesion modifiers other than metal salts, moisture-resistant agents, fluorescent whitening agents, and infrared absorbers. Only one of these other components may be used, or two or more may be used in combination. (Other details regarding the interlayer for laminated glass) The maximum transmittance of the aforementioned interlayer at wavelengths of 300 nm to 350 nm is preferably 0.1% or less, more preferably 0.09% or less, and even more preferably 0.08% or less. If the maximum transmittance is below the aforementioned upper limit, the visible light transmittance is less likely to decrease even with long-term use of the interlayer and laminated glass. Furthermore, the maximum transmittance of the aforementioned interlayer at wavelengths of 300 nm to 350 nm can also be 0% or more. The transmittance of the aforementioned intermediate film at a wavelength of 400 nm is preferably 1.5% or more, more preferably 3% or more, and even more preferably 5% or more. If the transmittance is above the lower limit mentioned above, the transmittance of visible light can be further improved. The transmittance of the aforementioned interlayer at wavelengths of 300 nm to 350 nm and at 400 nm can be measured as follows: A laminated glass A is obtained by placing the aforementioned interlayer between two sheets of transparent glass with a thickness of 2.5 mm, conforming to JIS R3202:1996. The transmittance of the obtained laminated glass A at wavelengths of 300 nm to 350 nm and at 400 nm is measured. The transmittance of the laminated glass A at wavelengths of 300 nm to 350 nm and at 400 nm are defined as the transmittance of the aforementioned interlayer at wavelengths of 300 nm to 350 nm and the transmittance at 400 nm, respectively. The aforementioned transmittance can be measured using a spectrophotometer (e.g., Hitachi High-Tech Co., Ltd.'s "U-4150") according to JIS R3211:1998. The ultraviolet transmittance (Tuv) of the aforementioned interlayer is preferably 0.5% or less, more preferably 0.3% or less, and even more preferably 0.1% or less. If the ultraviolet transmittance (Tuv) is below the aforementioned upper limit, the visible light transmittance is less likely to decrease even with long-term use of the interlayer and laminated glass. Furthermore, the ultraviolet transmittance (Tuv) of the aforementioned interlayer can also be 0% or more. The ultraviolet transmittance (Tuv) of the aforementioned interlayer film can be measured as follows: A laminated glass A is obtained by placing the aforementioned interlayer film between two sheets of transparent glass with a thickness of 2.5 mm, conforming to JIS R3202:1996. The transmittance of the obtained laminated glass A at wavelengths of 300 nm to 400 nm is measured. The value calculated based on the transmittance of laminated glass A at wavelengths of 300 nm to 400 nm using the method according to ISO 9050 is defined as the ultraviolet transmittance (Tuv) of the aforementioned interlayer film. The ultraviolet transmittance (Tuv) can be measured using a spectrophotometer (e.g., Hitachi High-Tech Co., Ltd.'s "U-4150") according to JIS R3211:1998. The absolute value (ΔYI) of the difference between the yellow index YI of the aforementioned intermediate film and the yellow index YI of a comparative intermediate film having the same layer composition and thickness as the aforementioned intermediate film, except that it does not contain metal salts, is calculated. The absolute value of this difference (ΔYI) is an indicator of the reactivity between the ultraviolet absorber and the metal salt. Preferably, the absolute value of this difference (ΔYI) is 0.1 or less, more preferably 0.08 or less, and even more preferably 0.05 or less. If the absolute value of this difference (ΔYI) is below the aforementioned upper limit, the color tone of the intermediate film is less likely to change due to variations in the amount of metal salt added, and adhesion can be easily adjusted. The yellow index YI of the aforementioned interlayer film is a yellow index calculated based on the total light transmittance. The yellow index of the aforementioned interlayer film can be measured as follows: The aforementioned interlayer film is placed between two sheets of transparent glass with a thickness of 2.5 mm according to JIS R3202:1996 to obtain laminated glass A. The total light transmittance of the obtained laminated glass A is measured. Based on the total light transmittance of laminated glass A, the yellow index YI of laminated glass A is calculated according to JIS K7373. The yellow index YI of laminated glass A is defined as the yellow index YI of the aforementioned interlayer film. Furthermore, the yellow index YI of the aforementioned comparative interlayer film can also be obtained in the same manner. Furthermore, the total light transmittance of laminated glass A can be measured in the following manner. Using a spectrophotometer, the laminated glass A is placed at a position parallel to the normal to the optical axis and in contact with the integrating sphere in the optical path between the light source and the integrating sphere, so that the transmitted light is received by the integrating sphere. The total light transmittance mentioned above refers to the visible light transmittance calculated based on the spectrophotometric transmittance measured under this condition. The total light transmittance mentioned above can be measured using a spectrophotometer (for example, the "U-4150" manufactured by Hitachi High-Tech Corporation). There are no particular limitations on the method of manufacturing laminated glass A. An example of the method for manufacturing laminated glass A is shown below. Laminated glass A is manufactured to measure the transmittance of the interlayer at wavelengths above 300 nm and below 350 nm, the transmittance at wavelength 400 nm, the ultraviolet transmittance (Tuv), and the yellow index (YI). An interlayer is sandwiched between two 2.5 mm thick transparent glass sheets conforming to JIS R3202:1996 to obtain a laminate. The obtained laminate is placed in a rubber bag and degassed under a vacuum of 2.6 kPa for 20 minutes. While degassed, it is directly transferred to an oven and held at 90°C for 30 minutes under vacuum pressure to pre-press the laminate. The pre-pressed laminate is then pressed in an autoclave at 135°C and 1.2 MPa for 20 minutes to obtain laminated glass A. Furthermore, when using the intermediate film of the present invention to obtain laminated glass articles, transparent glass with a thickness of 2.5 mm in accordance with JIS R3202:1996 can be used, or transparent glass other than transparent glass with a thickness of 2.5 mm in accordance with JIS R3202:1996 can be used, or laminated glass components other than transparent glass can be used. The aforementioned intermediate membrane has one end and another end on the opposite side of the aforementioned one end. The aforementioned one end and the aforementioned other end are the opposite ends of the intermediate membrane. The aforementioned intermediate film can be an intermediate film with the same thickness at one end as at the other end, or an intermediate film with a thickness at the other end greater than that at one end. The aforementioned intermediate film can be an intermediate film with uniform thickness or an intermediate film with varying thickness. The cross-sectional shape of the aforementioned intermediate film can be rectangular or wedge-shaped. The maximum thickness of the aforementioned intermediate film 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 preferably 3.8 mm or less, even more preferably 2.0 mm or less, and even more preferably 1.5 mm or less. From a practical point of view, and from the point of view of fully improving adhesion and penetration resistance, the maximum thickness of the surface layer of the above-mentioned intermediate film is preferably 0.001 mm or more, more preferably 0.2 mm or more, more preferably 0.3 mm or more, and preferably 1.0 mm or less, more preferably 0.8 mm or less. From a practical point of view and from the point of view of fully improving penetration resistance, the maximum thickness of the layer (intermediate layer) disposed between the two surface layers is preferably 0.001 mm or more, more preferably 0.1 mm or more, and even more preferably 0.2 mm or more, and preferably 0.8 mm or less, more preferably 0.6 mm or less, and even more preferably 0.3 mm or less. The distance between one end and the other end of the aforementioned intermediate membrane is preferably less than 3.0 m, more preferably less than 2.0 m, even more preferably less than 1.5 m, and preferably more than 0.5 m, more preferably more than 0.8 m, and even more preferably more than 1.0 m. Alternatively, the intermediate film can be wound to form an intermediate film roll body. The roll body may also have a core and an intermediate film wound around the outer periphery of the core. The manufacturing method of the aforementioned intermediate film is not particularly limited. As a method for manufacturing a single-layer intermediate film, an example is a method of extruding the resin composition using an extruder. As a method for manufacturing a multi-layer intermediate film, an example is a method of forming each layer using each resin composition for forming each layer, and then stacking the resulting layers. Furthermore, as a method for manufacturing the aforementioned intermediate film, an example is a method of stacking the layers by co-extruding each resin composition used to form each layer using an extruder. Since it is suitable for continuous production, an extrusion molding method is preferred. For the sake of superior manufacturing efficiency of the interlayer film, it is preferable that the second layer and the third layer comprise the same polyvinyl acetal resin. For the sake of superior manufacturing efficiency of the interlayer film, it is even more preferable that the second layer and the third layer comprise the same polyvinyl acetal resin and the same plasticizer. For the sake of superior manufacturing efficiency of the interlayer film, it is further preferable that the second layer and the third layer are formed from the same resin composition. The aforementioned intermediate film preferably has an uneven shape on at least one of its two surfaces. More preferably, the intermediate film has an uneven shape on both surfaces. The method for forming the uneven shape is not particularly limited, and examples include: die lip embossing (melt fracture), embossing roller method, calender roll method, and profile extrusion method. (Laminated Glass) The laminated glass of the present invention comprises a first laminated glass member, a second laminated glass member, and the aforementioned interlayer film. In the laminated glass of the present invention, the aforementioned interlayer film is disposed between the first laminated glass member and the second laminated glass member. Figure 3 is a cross-sectional view of an example of a laminated glass using the interlayer film shown in Figure 1. The laminated glass 31 shown in Figure 3 includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer 11. The interlayer 11 is disposed and sandwiched between the first laminated glass member 21 and the second laminated glass member 22. A first laminated glass member 21 is provided on the first surface layer of the intermediate film 11. A second laminated glass member 22 is provided on the second surface layer of the intermediate film 11 opposite to the first surface. A first laminated glass member 21 is provided on the surface layer outside the second layer 2. A second laminated glass member 22 is provided on the surface layer outside the third layer 3. Figure 4 is a cross-sectional view of an example of a laminated glass using the interlayer film shown in Figure 2. The laminated glass 31A shown in Figure 4 includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer 11A. The interlayer 11A is disposed and sandwiched between the first laminated glass member 21 and the second laminated glass member 22. A first laminated glass member 21 is formed on the first surface layer of the intermediate film 11A. A second laminated glass member 22 is formed on the second surface layer of the intermediate film 11A opposite to the first surface. The aforementioned laminated glass can also be a head-up display. When the laminated glass is a head-up display, it has a display area for the head-up display. This display area is an area capable of displaying information effectively. Using the above-described head-up display (HUD), a head-up display system can be obtained. The HUD system includes the aforementioned laminated glass and a light source device for illuminating the laminated glass with light for image display. The light source device can be installed, for example, on the dashboard in a vehicle. By illuminating the display area of ​​the laminated glass with light from the light source device, image display can be performed. The first laminated glass component is preferably a first glass plate. The second laminated glass component is preferably a second glass plate. Examples of the first and second laminated glass components mentioned above include glass sheets and PET (polyethylene terephthalate) films. The laminated glass includes not only laminated glass with an interlayer film sandwiched between two glass sheets, but also laminated glass with an interlayer film sandwiched between a glass sheet and a PET film. The laminated glass is a laminate containing a glass sheet, and preferably uses at least one glass sheet. The first and second laminated glass components are respectively a glass sheet or a PET film, and the laminated glass preferably includes a glass sheet as at least one of the first and second laminated glass components. More preferably, both the first and second laminated glass components are glass sheets. Examples of the aforementioned glass sheets include inorganic glass and plexiglass. Examples of inorganic glass include float glass, heat-absorbing glass, heat-reflecting glass, polished glass, patterned glass, wire-lined glass, and green glass. The aforementioned plexiglass is a synthetic resin glass that replaces inorganic glass. Examples of plexiglass include polycarbonate sheets and poly(meth)acrylic resin sheets. Examples of poly(meth)acrylic resin sheets include polymethyl methacrylate sheets. The thickness of each of the first and second laminated glass components is preferably 1 mm or more, and preferably 5 mm or less, more preferably 3 mm or less. Furthermore, when the laminated glass component is a glass sheet, the thickness of the glass sheet is preferably 0.5 mm or more, more preferably 0.7 mm or more, and preferably 5 mm or less, more preferably 3 mm or less. When the laminated glass component is a PET film, the thickness of the PET film is preferably 0.03 mm or more, and preferably 0.5 mm or less. The manufacturing method of the above-mentioned laminated glass is not particularly limited. First, an interlayer is sandwiched between the first laminated glass component and the second laminated glass component to obtain a laminate. Second, for example, the air remaining between the first laminated glass component, the second laminated glass component, and the interlayer is degassed by passing the obtained laminate through a pressure roller or placing it in a rubber bag for depressurization suction. Then, pre-bonding is performed at about 70°C to 110°C to obtain a pre-pressed laminate. Next, the pre-pressed laminate is placed in an autoclave or pressurized, and pressed at about 120°C to 150°C and a pressure of 1 MPa to 1.5 MPa. In this way, laminated glass can be obtained. The aforementioned interlayer film and laminated glass can be used in automobiles, rail vehicles, aircraft, ships, and buildings. They can also be used for other applications. Preferably, the interlayer film and laminated glass are for automotive or building applications, and more preferably for automotive applications. The aforementioned interlayer film and laminated glass can be used for automotive windshields, side windows, rear windows, sunroofs, or rearlights. The aforementioned interlayer film and laminated glass are suitable for use in automobiles. The aforementioned interlayer film is suitable for obtaining automotive laminated glass. The present invention will be further described in detail below with reference to embodiments and comparative examples. The present invention is not limited to these embodiments. In the polyvinyl acetal resin used, acetalization is performed using n-butyraldehyde with 4 carbon atoms. Regarding the polyvinyl acetal resin, the degree of acetalization (degree of butyraldehyde), degree of acetylation, and hydroxyl content are determined according to JIS K6728 "Test Method for Polyvinyl Butyral". Furthermore, when measured according to ASTM D1396-92, the same values ​​are shown as those obtained according to JIS K6728 "Test Method for Polyvinyl Butyral". Prepare the following materials. (Thermoplastic Resins) Polyvinyl Acetal Resin (Polyvinyl Butyral Resin, average degree of polymerization 1700, hydroxyl content 30 mol%, degree of acetylation 1 mol%, degree of acetalization (butyraldehyde) 69 mol%) Polyvinyl Acetal Resin (Polyvinyl Butyral Resin, average degree of polymerization 3000, hydroxyl content 22 mol%, degree of acetylation 13 mol%, degree of acetalization (butyraldehyde) 65 mol%) Polyvinyl Acetal Resin (Polyvinyl Butyral Resin, average degree of polymerization 1700, hydroxyl content 30.5 mol%, degree of acetylation 1 mol%, degree of acetalization (butyraldehyde) 68.5 mol%) (Plasticizer) Triethylene glycol di(2-ethylhexanoate) (3GO) (UV absorbers) UV absorber (X): The UV absorber represented by formula (X11) above ("Tinuvin 234" manufactured by BASF) The UV absorber represented by formula (X12) above ("Tinuvin 640" manufactured by BASF) The UV absorber represented by formula (X13) above ("Eversorb 88" manufactured by Everlight Chemical) UV absorbers that are not equivalent to UV absorber (X): 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole (BASF's "Tinuvin 329") 2-(5-tert-butyl-2-hydroxyphenyl)benzotriazole (BASF's "Tinuvin PS") 2,2',4,4'-tetrahydroxybenzophenone (Shipro Kasei's "SEESORB106", a UV absorber that does not have a benzotriazole skeleton but has a benzophenone skeleton) (Metal Salts) Metal Salt 1: A mixture of magnesium 2-ethylbutyrate and magnesium acetate in a 50:50 (weight ratio) ratio. Metal Salt 2: Potassium acetate. (Antioxidant) BHT (2,6-di-tert-butyl-p-cresol) (Example 1) Preparation of composition for forming intermediate film: The following ingredients are prepared and thoroughly mixed using a mixing roller to obtain composition for forming intermediate film. Polyvinyl butyral resin (average degree of polymerization 1700, hydroxyl content 30 mol%, degree of acetylation 1 mol%, degree of acetalization (butyraldehyde degree) 69 mol%): 100 parts by weight; triethylene glycol di(2-ethylhexanoate) (3GO): 40 parts by weight; UV absorber represented by the above formula (X12): 0.4 parts by weight; 1 metal salt of magnesium in an amount of 0.038 parts by weight (1 metal salt of magnesium in an amount of 60 ppm in the obtained intermediate film); 0.2% by weight of antioxidant (BHT) in the obtained intermediate film. Intermediate film preparation: The composition used to form the intermediate film is extruded using an extruder to prepare a single-layer intermediate film (760 μm thick) having only the first layer. Fabrication of the laminated glass: The obtained interlayer film is sandwiched between two 2.5 mm thick transparent glass sheets (300 mm long × 300 mm wide) conforming to JIS R3202:1996 to obtain a laminate. The obtained laminate is placed in a rubber bag and degassed under a vacuum of 2.6 kPa for 20 minutes. While degassed, it is directly transferred to an oven and held at 90°C for 30 minutes under vacuum pressure to pre-press the laminate. The pre-pressed laminate is then pressed in an autoclave at 135°C and 1.2 MPa for 20 minutes to obtain the laminated glass. The obtained laminated glass is equivalent to the laminated glass A described above. (Examples 2-6 and Comparative Examples 1-9) Except for changing the type and content of the ultraviolet absorber and the type and content of the metal salt as shown in Tables 2-4, a single-layer intermediate film (760 μm thick) was prepared in the same manner as in Example 1. Furthermore, the same type and dosage of antioxidant were used as in Example 1. (Example 7) Preparation of the resin composition for forming the first layer: The following components are prepared and thoroughly mixed using a mixing roller to obtain the resin composition for forming the first layer. Polyvinyl butyral resin (average degree of polymerization 3000, hydroxyl content 22 mol%, degree of acetylation 13 mol%, degree of acetalization 65 mol%): 100 parts by weight; triethylene glycol di(2-ethylhexanoate) (3GO): 40 parts by weight; UV absorber represented by the above formula (X12): 0.4 parts by weight; 0.038 parts by weight of metal salt 1 (magnesium content of 60 ppm in the obtained first layer); 0.2% by weight of antioxidant (BHT) in the obtained first layer. Preparation of the resin composition for forming the second and third layers: The following components are prepared and thoroughly mixed using a mixing roller to obtain the resin composition for forming the second and third layers. Polyvinyl butyral resin (average degree of polymerization 1700, hydroxyl content 30.5 mol%, degree of acetylation 1 mol%, degree of acetalization 68.5 mol%): 100 parts by weight; triethylene glycol di(2-ethylhexanoate) (3GO): 40 parts by weight; UV absorber represented by the above formula (X12): 0.4 parts by weight; 0.038 parts by weight of metal salt 1 (in the obtained second and third layers, the magnesium content is 60 ppm of metal salt 1); 0.2% by weight of antioxidant (BHT) in the obtained second and third layers. Fabrication of the intermediate film: The resin composition used to form the first layer and the resin composition used to form the second and third layers are co-extruded using a co-extruder to obtain an intermediate film with a 3-layer structure (second layer / first layer / third layer) (thickness of 760 μm). Fabrication of the laminated glass: Except for using the obtained intermediate film, the laminated glass was obtained in the same manner as in Example 1. The obtained laminated glass is equivalent to the laminated glass A described above. (Examples 8 and 9) Except for changing the type and content of the ultraviolet absorber and the type and content of the metal salt as shown in Table 5, an intermediate film with a three-layer structure (second layer / first layer / third layer) (thickness of 760 μm) was prepared in the same manner as in Example 7. Furthermore, the same type and dosage of antioxidant were used as in Example 7. (Evaluation) (1) The maximum transmittance of the intermediate film at wavelengths above 300 nm and below 350 nm was determined by using a spectrophotometer ("U-4150" manufactured by Hitachi High Technology Co., Ltd.) to measure the transmittance of the obtained laminated glass (laminated glass A) at wavelengths above 300 nm and below 350 nm, thereby determining the maximum transmittance of the intermediate film at wavelengths above 300 nm and below 350 nm. (2) The transmittance of the intermediate film at a wavelength of 400 nm was measured using a spectrophotometer ("U-4150" manufactured by Hitachi High Technology Co., Ltd.) and the above method was used to determine the transmittance of the laminated glass (laminated glass A) at a wavelength of 400 nm. (3) Ultraviolet transmittance Tuv of the intermediate film: Using a spectrophotometer ("U-4150" manufactured by Hitachi High Technology Co., Ltd.), the transmittance of the obtained laminated glass (laminated glass A) at wavelengths above 300 nm and below 400 nm was measured using the above method, and the ultraviolet transmittance Tuv of the intermediate film was determined. [Criteria for Determining the Ultraviolet Transmittance (Tuv) of the Intermediate Film] ○: The ultraviolet transmittance (Tuv) of the intermediate film is less than 0.5% ×: The ultraviolet transmittance (Tuv) of the intermediate film exceeds 0.5% (4) Yellow index YI of the interlayer: The total light transmittance of the obtained laminated glass (laminated glass A) was measured using a spectrophotometer ("U-4150" manufactured by Hitachi High Technology Co., Ltd.) and the above method was used to determine the yellow index YI of the interlayer. (5) Reactivity of UV absorbers with metal salts (absolute value of ΔYI): The change in the yellow index YI of the intermediate film due to the presence or absence of metal salts is calculated between intermediate films containing the same type of UV absorber. That is, ΔYI is the value obtained by subtracting the yellow index YI of the intermediate film used as a reference (intermediate film without metal salts) from the yellow index YI of the intermediate film being evaluated. More specifically, ΔYI is calculated using the following formula. The combination of the intermediate film being evaluated and the intermediate film used as a reference is described below. Furthermore, the closer the absolute value of ΔYI is to 0, the lower the reactivity of the UV absorber with the metal salt is suppressed, thus making the intermediate film less prone to yellowing. ΔYI = (YI of the intermediate membrane being evaluated) - (YI of the intermediate membrane serving as the benchmark) More specifically, as described below. ΔYI = (YI of the intermediate membrane obtained in Examples 1-4) - (YI of the intermediate membrane obtained in Comparative Example 1) ΔYI = (YI of the intermediate membrane obtained in Example 5) - (YI of the intermediate membrane obtained in Comparative Example 2) ΔYI = (YI of the intermediate membrane obtained in Example 6) - (YI of the intermediate membrane obtained in Comparative Example 3) ΔYI = (YI of the intermediate membrane obtained in Example 7) - (YI of the intermediate membrane obtained in Comparative Example 1) ΔYI = (YI of the intermediate membrane obtained in Example 8) - (YI of the intermediate membrane obtained in Comparative Example 2) ΔYI = (YI of the intermediate membrane obtained in Example 9) - (YI of the intermediate membrane obtained in Comparative Example 3) ΔYI = (YI of the intermediate membrane obtained in Comparative Example 4) - (YI of the intermediate membrane obtained in Comparative Example 5) ΔYI = (YI of the intermediate membrane obtained in Comparative Example 6) - (YI of the intermediate membrane obtained in Comparative Example 7) ΔYI = (YI of the intermediate membrane obtained in Comparative Example 8) - (YI of the intermediate membrane obtained in Comparative Example 9) [Criteria for determining the reactivity (absolute value of ΔYI) between ultraviolet absorbers and metal salts] ○: Absolute value of ΔYI is less than 0.1 ×: Absolute value of ΔYI exceeds 0.1 (6) Adhesion between the interlayer and the laminated glass component (determination of Pummel value) The obtained laminated glass was left to stand for 16 hours at a temperature of -18℃±0.6℃. The central part (150 mm long × 150 mm wide) of the stood laminated glass was then struck with a hammer with a head of 0.45 kg to crush it until the glass particle size reached less than 6 mm. The exposure of the film after partial glass peeling was measured, and the Pummel value was determined according to Table 1 below. Furthermore, the Pummel value refers to the degree of adhesion between the interlayer and the glass plate, and is a value specified by the exposure of the film (area %) after partial glass peeling, as defined in Table 1. A Pummel value of 2 to 7 is evaluated as "○", and other values ​​are evaluated as "×". [Table 1] The composition and results of the intermediate membrane are shown in Tables 2 to 5 below. [Table 2] [Table 3] [Table 4] [Table 5] 1: First layer 1a: First surface 1b: Second surface 2: Second layer 3: Third layer 11: Intermediate film 11A: Intermediate film 21: First laminated glass component 22: Second laminated glass component 31: Laminated glass 31A: Laminated glass Figure 1 is a schematic cross-sectional view showing an interlayer film for laminated glass according to a first embodiment of the present invention. Figure 2 is a schematic cross-sectional view showing an interlayer film for laminated glass according to a second embodiment of the present invention. Figure 3 is a schematic cross-sectional view showing an example of laminated glass using the interlayer film for laminated glass shown in Figure 1. Figure 4 is a schematic cross-sectional view showing an example of laminated glass using the interlayer film for laminated glass shown in Figure 2.

Claims

1. An interlayer for laminated glass, having a structure of three or more layers, the interlayer comprising 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 to the first surface, the second layer being a surface layer of the interlayer, the third layer being a surface layer of the interlayer, the first layer comprising a thermoplastic resin, the second layer comprising a thermoplastic resin, an ultraviolet absorber represented by the following formula (X12) and a metal salt, the third layer comprising a thermoplastic resin, an ultraviolet absorber represented by the following formula (X12) and a metal salt, wherein the thermoplastic resin in the first layer is different from the thermoplastic resin in the second layer, and the thermoplastic resin in the first layer is different from the thermoplastic resin in the third layer; [Chemical 1].

2. The interlayer for laminated glass as claimed in claim 1, wherein the metal salt in the second layer comprises an alkali metal salt or an alkaline earth metal salt, and the metal salt in the third layer comprises an alkali metal salt or an alkaline earth metal salt.

3. The interlayer for laminated glass as claimed in claim 1, wherein the metal salt in the second layer comprises a magnesium salt of an organic acid having a branched structure, and the metal salt in the third layer comprises a magnesium salt of an organic acid having a branched structure.

4. The interlayer for laminated glass as claimed in claim 1, wherein the metal salt in the second layer comprises a metal salt of an organic acid having 2 to 8 carbon atoms, other than a magnesium salt of an organic acid having a branched structure, and the metal salt in the third layer comprises a metal salt of an organic acid having 2 to 8 carbon atoms, other than a magnesium salt of an organic acid having a branched structure.

5. The interlayer for laminated glass as claimed in any one of claims 1 to 4, wherein in the second layer, the weight ratio of the metal content contained in the metal salt to the weight ratio of the ultraviolet absorber content is 4 to 50, and in the third layer, the weight ratio of the metal content contained in the metal salt to the weight ratio of the ultraviolet absorber content is 4 to 50.

6. For the interlayer film used in laminated glass as requested in any of items 1 to 4, the maximum transmittance of the interlayer film at wavelengths above 300 nm and below 350 nm is less than 0.1%.

7. The interlayer for laminated glass as requested in any of items 1 to 4, wherein the ultraviolet transmittance (Tuv) of the interlayer is less than 0.5%.

8. The interlayer for laminated glass as claimed in any of claims 1 to 4, wherein the transmittance of the interlayer at a wavelength of 400 nm is 1.5% or more.

9. An interlayer for laminated glass as claimed in any of claims 1 to 4, wherein the absolute value of the difference between the yellow index YI of the interlayer and the yellow index YI of a comparative interlayer having the same layer composition and thickness as the interlayer except that it does not contain metal salts is 0.1 or less.

10. A laminated glass comprising: a first laminated glass member; a second laminated glass member; and an interlayer for the laminated glass as claimed in any one of claims 1 to 9; wherein the interlayer for the laminated glass is disposed between the first laminated glass member and the second laminated glass member.

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