Intermediate film for laminated glass and laminated glass

Abstract

Provided is an intermediate film for laminated glass, capable of suppressing color migration and improving ease of handling the intermediate film.　The intermediate film for laminated glass according to the present invention includes: a thermoplastic resin; a first plasticizer having a solubility parameter of less than 18.0 (J / cm3)0.5; and a second plasticizer having a solubility parameter of 18.0 (J / cm3)0.5 or more.

Description

Interlayer film for laminated glass and laminated glass

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

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

[0003] Interlayer films containing colorants are also known (for example, see Patent Document 1 below).

[0004] Japanese Patent Application Laid-Open No. 2018-187929

[0005] Known interlayer films containing a colorant include an interlayer film having only a colored layer, an interlayer film having a colored layer and a non-colored layer, etc. Examples of interlayer films containing a colorant include an interlayer film having a shade region and an interlayer film having a gradation region.

[0006] However, in conventional interlayer films containing colorants, the colorant can gradually migrate to unintended areas during storage of the interlayer film, causing color transfer.

[0007] Furthermore, contact between an interlayer film that does not contain a colorant and an interlayer film that does contain a colorant can cause color transfer to the interlayer film that does not contain a colorant. Although work procedures are generally in place to prevent contact between an interlayer film that contains a colorant and an interlayer film that does not contain a colorant in order to prevent color transfer to the interlayer film that does not contain a colorant, being able to prevent color transfer to the interlayer film that does not contain a colorant would contribute to simplifying the work procedures and work space.

[0008] The present inventors have found that color transfer can be suppressed by using a plasticizer with high polarity as the plasticizer contained in the interlayer film. However, simply using a plasticizer with high polarity tends to increase the glass transition temperature of the interlayer film. Therefore, simply using a plasticizer with high polarity reduces the handleability of the interlayer film, such as causing film slippage when the interlayer film is rolled up and reducing the ease of trimming the interlayer film that protrudes from the edge of the laminated glass component during the production of laminated glass (trim-cutting workability).

[0009] An object of the present invention is to provide an interlayer film for laminated glass that can suppress color transfer and improve the handleability of the interlayer film. Another object of the present invention is to provide laminated glass using the above interlayer film for laminated glass.

[0010] According to a broad aspect of the present invention, a thermoplastic resin and a polymer having a solubility parameter of 18.0 (J / cm ３ ) ０．５ a first plasticizer having a solubility parameter of less than 18.0 (J / cm ３ ) ０．５ An interlayer film for laminated glass (hereinafter, sometimes referred to as an interlayer film) is provided, which contains the above-described second plasticizer.

[0011] In a specific aspect of the interlayer film according to the present invention, the interlayer film includes a layer X containing the first plasticizer and the second plasticizer.

[0012] In a specific aspect of the interlayer film according to the present invention, the solubility parameter of the first plasticizer is 15.0 (J / cm ３ ) ０．５ or more, and the solubility parameter of the second plasticizer is 18.5 (J / cm ３ ) ０．５ or more 30.0 (J / cm ３ ) ０．５ The following is the result.

[0013] In a specific aspect of the interlayer film according to the present invention, the absolute value of the difference between the solubility parameter of the second plasticizer and the solubility parameter of the first plasticizer is 0.5 (J / cm ３ ) ０．５ That's all.

[0014] In a specific aspect of the interlayer film according to the present invention, the first plasticizer is triethylene glycol di-2-ethylhexanoate, triethylene glycol di-2-ethylbutyrate, or triethylene glycol di-n-butanoate.

[0015] In a specific aspect of the interlayer film according to the present invention, the second plasticizer is trimethylolpropane, triethylene glycol, 3-(2-ethylhexyloxy)-1,2-propanediol, or polycaprolactone triol represented by the following formula (P):

[0016]

[0017] In the formula (P), R １ ~R ３ represents a group represented by the following formula (P1).

[0018]

[0019] In the formula (P1), n ​​represents a number of 1 or more and 5 or less, and * represents the bonding position with the oxygen atom.

[0020] In a specific aspect of the interlayer film according to the present invention, the interlayer film includes a layer X containing the first plasticizer and the second plasticizer, and the content of the second plasticizer in 100% by weight of the plasticizer contained in the layer X is 20% by weight or more and 80% by weight or less.

[0021] In a specific aspect of the interlayer film according to the present invention, the interlayer film includes a layer X containing the first plasticizer and the second plasticizer, the layer X contains the thermoplastic resin, and an absolute value of the difference between the solubility parameter of the thermoplastic resin contained in the layer X and the solubility parameter of the second plasticizer contained in the layer X is 9.0 (J / cm ３ ) ０．５ The following is the result.

[0022] In a specific aspect of the interlayer film according to the present invention, the interlayer film contains a colorant.

[0023] In a specific aspect of the interlayer film according to the present invention, the colorant is a dye.

[0024] According to a broad aspect of the present invention, there is provided laminated glass comprising a first laminated glass element, a second laminated glass element, and the above-described interlayer film for laminated glass, with the interlayer film for laminated glass disposed between the first laminated glass element and the second laminated glass element.

[0025] The interlayer film for laminated glass according to the present invention is a thermoplastic resin having a solubility parameter of 18.0 (J / cm ３ ) ０．５ a first plasticizer having a solubility parameter of less than 18.0 (J / cm ３ ) ０．５ The interlayer film for laminated glass according to the present invention has the above-described configuration, which makes it possible to suppress color transfer and improve the handleability of the interlayer film.

[0026] Fig. 1 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a second embodiment of the present invention. Figs. 3(a) and 3(b) are a cross-sectional view and a front view schematically showing an interlayer film for laminated glass according to a third embodiment of the present invention. Fig. 4 is a cross-sectional view schematically showing an example of laminated glass using the interlayer film for laminated glass shown in Fig. 1. Fig. 5 is a cross-sectional view schematically showing an example of laminated glass using the interlayer film for laminated glass shown in Fig. 2.

[0027] The present invention will be described in detail below.

[0028] (Interlayer Film for Laminated Glass) The interlayer film for laminated glass according to the present invention (sometimes abbreviated as "interlayer film" in this specification) is used in laminated glass.

[0029] The interlayer film of the present invention has a single-layer structure or a two or more-layer structure. The interlayer film of the present invention may have a single-layer structure or a two or more-layer structure. The interlayer film of the present invention may have a two-layer structure, a two or more-layer structure, a three-layer structure, or a three or more-layer structure. The interlayer film of the present invention may have only a first layer. The interlayer film of the present invention may have a structure of 10 or less layers, or a structure of 5 or less layers. The interlayer film of the present invention may have a first layer and a second layer disposed on a first surface side of the first layer. The interlayer film of the present invention may have a first layer, a second layer disposed on a first surface side of the first layer, and a third layer disposed on a second surface side of the first layer opposite the first surface. The interlayer film of the present invention may be a single-layer interlayer film or a multi-layer interlayer film. The structure of the interlayer film of the present invention may be partially different. For example, the interlayer film of the present invention may have a portion having a single-layer structure and a portion having a multi-layer structure.

[0030] The interlayer film according to the present invention may have a shaded region. The shaded region can be formed, for example, by using a colorant. The interlayer film according to the present invention may have, in plan view, a colored region (colored region) and an uncolored region (non-colored region).

[0031] The interlayer film for laminated glass according to the present invention is a thermoplastic resin having a solubility parameter of 18.0 (J / cm ３ ) ０．５ a first plasticizer having a solubility parameter of less than 18.0 (J / cm ３ ) ０．５ and a second plasticizer.

[0032] The interlayer film according to the present invention has the above-mentioned configuration, and therefore color transfer can be suppressed and the handleability of the interlayer film can be improved.

[0033] In the interlayer film according to the present invention, when the interlayer film contains a colorant, the colorant is less likely to migrate to unintended areas during storage of the interlayer film, thereby preventing color transfer. Furthermore, in the interlayer film according to the present invention, when the interlayer film does not contain a colorant, even if the interlayer film comes into contact with an interlayer film containing a colorant, color transfer from the interlayer film containing a colorant can be prevented.

[0034] Furthermore, in the interlayer film according to the present invention, the glass transition temperature of the interlayer film can be appropriately reduced, which improves the handleability of the interlayer film.

[0035] The interlayer preferably includes a layer X containing the first plasticizer and the second plasticizer.

[0036] In the interlayer film, the first layer may be the layer X, the second layer may be the layer X, and the third layer may be the layer X. When the interlayer film includes a plurality of layers X, the layers X may have different compositions.

[0037] When the interlayer film is a single-layer interlayer film having only a first layer, the first layer is layer X. When the interlayer film is a multi-layer interlayer film having a structure of two or more layers, the interlayer film preferably has at least one layer X.

[0038] The layer X may be a surface layer or an intermediate layer in the interlayer film. The layer X may constitute both a surface layer and an intermediate layer in the interlayer film. The layer X may constitute all layers in the interlayer film. The layer X may form a shade region.

[0039] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

[0040] Fig. 1 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a first embodiment of the present invention, in which a cross section of an interlayer film 11 in the thickness direction is shown.

[0041] The interlayer film 11 shown in FIG. 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 and laminated on a first surface 1a of the first layer 1. The third layer 3 is disposed and laminated on a second surface 1b of the first layer 1 opposite the first surface 1a. The first layer 1 is an interlayer. The second layer 2 and the third layer 3 are each protective layers, and in this embodiment, are surface layers. The first layer 1 is disposed 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, first layer 1, and third layer 3 are laminated in this order.

[0042] The first layer 1 is a layer X containing a thermoplastic resin, a first plasticizer, a second plasticizer, and a colorant. The second layer 2 and the third layer 3 are also layers X containing a thermoplastic resin, a first plasticizer, and a second plasticizer. The first layer 1 is a colored layer, and the second layer 2 and the third layer 3 are transparent layers and non-colored layers. In the interlayer film 11, the colorant contained in the first layer 1 is less likely to migrate to the second layer 2 and the third layer 3, thereby suppressing color transfer.

[0043] It should be noted that 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, etc. It is preferable that the second layer 2 and the first layer 1, and the first layer 1 and the third layer 3 are directly laminated to each other.

[0044] 2 is a cross-sectional view schematically illustrating an interlayer film for laminated glass according to a second embodiment of the present invention, showing a cross section in the thickness direction of an interlayer film 11A.

[0045] The interlayer film 11A shown in FIG. 2 is a single-layer interlayer film having a one-layer structure. The interlayer film 11A is a first layer. The interlayer film 11A is used to obtain laminated glass. The interlayer film 11A is an interlayer film for laminated glass. The interlayer film 11A is a layer X containing a thermoplastic resin, a first plasticizer, and a second plasticizer.

[0046] 3(a) and 3(b) are schematic cross-sectional and front views of an interlayer film for laminated glass according to a third embodiment of the present invention. Fig. 3(a) is a cross-sectional view taken along line II in Fig. 3(b). Fig. 3(a) shows a cross section in the thickness direction of the interlayer film 11B.

[0047] The interlayer film 11B is a multilayer interlayer film having a structure of two or more layers. The interlayer film 11B includes a first layer 1B, a second layer 2B, and a third layer 3B. The second layer 2B is disposed on a first surface of the first layer 1B, and the two layers are laminated together. The third layer 3B is disposed on a second surface of the first layer 1B, opposite the first surface, and the two layers are laminated together. The first layer 1B is an intermediate layer. The second layer 2B and the third layer 3B are each protective layers, and in this embodiment, are surface layers. The first layer 1B is disposed between the second layer 2B and the third layer 3B, and is sandwiched between them. Therefore, the interlayer film 11B has a multilayer structure (second layer 2B / first layer 1B / third layer 3B) in which the second layer 2B, the first layer 1B, and the third layer 3B are laminated in this order.

[0048] The intermediate film 11B has one end 11a and the other end 11b opposite the one end 11a. The one end 11a and the other end 11b are opposite ends. The cross-sectional shape in the thickness direction of the first layer 1B, the second layer 2B, and the third layer 3B is wedge-shaped. The thickness of the first layer 1B, the second layer 2B, and the third layer 3B is greater on the other end 11b side than on the one end 11a side. Therefore, the thickness of the other end 11b of the intermediate film 11B is greater than the thickness of the one end 11a. Therefore, the intermediate film 11B has a thin region and a thick region.

[0049] The interlayer 11B has a display-corresponding region R1 corresponding to the display area of ​​the head-up display. The interlayer 11B has a peripheral region R2 adjacent to the display-corresponding region R1. The interlayer 11B has a shade region R3 spaced apart from the display-corresponding region R1. The shade region R3 is located at the edge of the interlayer 11B.

[0050] The first layer 1B is a layer X containing a thermoplastic resin, a first plasticizer, a second plasticizer, and a colorant. The second layer 2B and the third layer 3B are layers X containing a thermoplastic resin, a first plasticizer, and a second plasticizer. The intermediate film 11B can suppress migration of the colorant, thereby suppressing discoloration of the shade area.

[0051] The cross-sectional shape in the thickness direction of the first layer may be rectangular or wedge-shaped. The cross-sectional shape in the thickness direction of the second layer may be rectangular or wedge-shaped. The cross-sectional shape in the thickness direction of the third layer may be rectangular or wedge-shaped. The cross-sectional shape in the thickness direction of the layer X may be rectangular or wedge-shaped.

[0052] Hereinafter, details of the first layer, the second layer, and the third layer that constitute the interlayer film according to the present invention, as well as details of each component contained in the first layer, the second layer, and the third layer, will be described.

[0053] (Thermoplastic Resin) The interlayer film contains a thermoplastic resin (hereinafter, may be referred to as thermoplastic resin (0)). The interlayer film preferably contains a polyvinyl acetal resin (hereinafter, may be referred to as polyvinyl acetal resin (0)) as the thermoplastic resin (0). The first layer preferably contains a thermoplastic resin (hereinafter, may be referred to as thermoplastic resin (1)). The first layer preferably contains a polyvinyl acetal resin (hereinafter, may be referred to as polyvinyl acetal resin (1)) as the thermoplastic resin (1). The second layer preferably contains a thermoplastic resin (hereinafter, may be referred to as thermoplastic resin (2)). The second layer preferably contains a polyvinyl acetal resin (hereinafter, may be referred to as polyvinyl acetal resin (2)) as the thermoplastic resin (2). The third layer preferably contains a thermoplastic resin (hereinafter, may be referred to as thermoplastic resin (3)). The third layer preferably contains a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (3)) as the thermoplastic resin (3). The layer X preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (4)). The layer X preferably contains a polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin (4)) as the thermoplastic resin (4). The thermoplastic resin (1), the thermoplastic resin (2), the thermoplastic resin (3), and the thermoplastic resin (4) may be the same or different. Since sound insulation is further improved, the thermoplastic resin (1) is preferably different from the thermoplastic resin (2) and the thermoplastic resin (3). The polyvinyl acetal resin (1), the polyvinyl acetal resin (2), the polyvinyl acetal resin (3), and the polyvinyl acetal resin (4) may be the same or different. The polyvinyl acetal resin (1) is preferably different from the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3), since this further improves the sound insulation.The thermoplastic resin (0), the thermoplastic resin (1), the thermoplastic resin (2), the thermoplastic resin (3), and the thermoplastic resin (4) may each be used alone or in combination of two or more thereof. The polyvinyl acetal resin (0), the polyvinyl acetal resin (1), the polyvinyl acetal resin (2), the polyvinyl acetal resin (3), and the polyvinyl acetal resin (4) may each be used alone or in combination of two or more thereof.

[0054] Examples of the thermoplastic resin include polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, polyurethane resin, (meth)acrylic resin, polyolefin resin, ionomer resin, polyvinyl alcohol resin, etc. Thermoplastic resins other than these may also be used.

[0055] The absolute value of the difference between the solubility parameter (SP value) of the thermoplastic resin contained in the layer X and the solubility parameter (SP value) of the second plasticizer contained in the layer X is preferably 9.0 (J / cm ３ ) ０．５ or less, more preferably 6.5 (J / cm ３ ) ０．５ More preferably, 3.0 (J / cm ３ ) ０．５ When the absolute value of the difference is equal to or less than the upper limit, the compatibility between the thermoplastic resin and the second plasticizer can be further improved. The absolute value of the difference is 0.1 (J / cm ３ ) ０．５ or more, and may be 1.0 (J / cm ３ ) ０．５ The solubility parameter (SP value) of the thermoplastic resin contained in the layer X may be larger than, smaller than, or the same as the solubility parameter (SP value) of the second plasticizer contained in the layer X.

[0056] The method for calculating the solubility parameter (SP value) of a plasticizer will be described later. The solubility parameter (SP value) of a thermoplastic resin can be determined as follows. First, the following solubility test is performed using a thermoplastic resin and 22 types of solvents with known Hansen solubility parameters. Next, using the Sphere program of the software "HSPiP 4th Edition 4.1.07" available on the Internet, the Hansen solubility parameters (dispersion term (dD), polarization term (dP), and hydrogen bond term (dH)) of the thermoplastic resin are calculated from the results of the solubility test, assuming a single dissolving sphere. The Hildebrand SP value (δ) calculated from the obtained dispersion term (dD), polarization term (dP), and hydrogen bond term (dH) using the following formula (1) is taken as the solubility parameter (SP value) of the thermoplastic resin.

[0057] SP value (δ) = ((dD) ２ + (dP) ２ + (dH) ２ ) ０．５ ...Formula (1)

[0058] If fitting using a single dissolution sphere is not possible, a double sphere is assumed using the software's Generic Algorithm, and fitting is performed using two dissolution spheres. The dispersion term (dD), polarization term (dP), and hydrogen bond term (dH) in the dissolution sphere with the greater contribution of the polarization term (dP) and hydrogen bond term (dH) are used as the Hansen solubility parameters of the thermoplastic resin. From the values ​​of these terms, the Hildebrand SP value (δ) is calculated using the above formula (1), and this is used as the solubility parameter (SP value) of the thermoplastic resin.

[0059] Solubility Test: 200 mg of thermoplastic resin molded into a sheet was taken and shaken at room temperature for 72 hours in 10 mL of each of the following solvents to dissolve and swell. Completely dissolved samples and samples that were not completely dissolved but dissolved to the point where they no longer retained their original shape were ranked 1 and 2, respectively. Swelling rates of 1000% or greater, 100% to less than 1000%, 10% to less than 100%, and less than 10% were ranked 3, 4, 5, and 6, respectively. Samples with ranks 1, 2, and 3 were labeled as soluble, and samples with ranks 4 or greater were labeled as insoluble. Ranks 1 and 2 were visually determined, and ranks 3, 4, 5, and 6 were determined by measuring the sample weight (w1) before the solubility test and the sample weight (w2) after the solubility test, and calculating the swelling rate as 100 x (w2 - w1) / w1 (%).

[0060] 22 types of solvents used in the solubility test: benzaldehyde, 2-butoxyethanol, acrylic acid, ethyl acetate, acetone, toluene, THF, methanol, ethanol, IPA, 1-butanol, xylene, hexane, a mixed solvent of ethylene carbonate and diethyl carbonate in a volume ratio of 1:1, 2-ethylhexanal, triethylene glycol di-2-ethylhexanoate (3GO), N,N-dimethylformamide, ethylene glycol, methyl ethyl ketone, 1-methyl-2-pyrrolidone, diethylene glycol, and water.

[0061] The polyvinyl acetal resin can be produced, for example, by acetalizing polyvinyl alcohol (PVA) with an aldehyde. The polyvinyl acetal resin is preferably an acetalized product of polyvinyl alcohol. The polyvinyl alcohol can be obtained, for example, by saponifying polyvinyl acetate. The degree of saponification of the polyvinyl alcohol is generally within the range of 70 mol% to 99.9 mol%.

[0062] The average degree of polymerization of the polyvinyl alcohol (PVA) is preferably 200 or more, more preferably 500 or more, even more preferably 1500 or more, even more preferably 1600 or more, particularly preferably 2600 or more, and most preferably 2700 or more, and is preferably 5000 or less, more preferably 4000 or less, and even more preferably 3500 or less. When the average degree of polymerization is at least the lower limit, the penetration resistance of the laminated glass is further improved. When the average degree of polymerization is at most the upper limit, the interlayer film is easily formed.

[0063] The average degree of polymerization of the polyvinyl alcohol is determined by a method in accordance with JIS K6726 "Testing methods for polyvinyl alcohol."

[0064] The number of carbon atoms in the acetal group contained in the polyvinyl acetal resin is not particularly limited. The aldehyde used in producing the polyvinyl acetal resin is not particularly limited. The number of carbon atoms in the acetal group in the polyvinyl acetal resin is preferably 3 to 5, and more preferably 3 or 4. When the number of carbon atoms in the acetal group in the polyvinyl acetal resin is 3 or more, the glass transition temperature of the interlayer film is sufficiently low. The number of carbon atoms in the acetal group in the polyvinyl acetal resin may be 4 or 5.

[0065] The aldehyde is not particularly limited. In general, an aldehyde having 1 to 10 carbon atoms is suitably used. Examples of the aldehyde having 1 to 10 carbon atoms include propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexylaldehyde, n-octylaldehyde, n-nonylaldehyde, n-decylaldehyde, formaldehyde, acetaldehyde, and benzaldehyde. The aldehyde is preferably propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexylaldehyde, or n-valeraldehyde, more preferably propionaldehyde, n-butyraldehyde, or isobutyraldehyde, and even more preferably n-butyraldehyde. The above aldehydes may be used alone or in combination of two or more.

[0066] The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (0) is preferably 15 mol% or more, more preferably 18 mol% or more, and preferably 40 mol% or less, more preferably 35 mol% or less. When the hydroxyl group content is equal to or greater than the lower limit, the adhesive strength of the interlayer film is further increased. When the hydroxyl group content is equal to or less than the upper limit, the flexibility of the interlayer film is increased, making it easier to handle.

[0067] The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (1) is preferably 17 mol% or more, more preferably 20 mol% or more, even more preferably 22 mol% or more, and preferably 28 mol% or less, more preferably 27 mol% or less, even more preferably 25 mol% or less, and particularly preferably 24 mol% or less. When the hydroxyl group content is equal to or greater than the lower limit, the mechanical strength of the interlayer film is further increased. In particular, when the hydroxyl group content of the polyvinyl acetal resin (1) is 20 mol% or more, the reaction efficiency is high and productivity is excellent, and when it is 28 mol% or less, the sound insulation of the laminated glass is further improved. Furthermore, when the hydroxyl group content is equal to or less than the upper limit, the flexibility of the interlayer film is high, making it easier to handle.

[0068] When the layer X is not a surface layer of an interlayer film, the preferred range of the hydroxyl group content of the polyvinyl acetal resin (4) is the same as the preferred range of the hydroxyl group content of the polyvinyl acetal resin (1).

[0069] The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 25 mol% or more, more preferably 28 mol% or more, more preferably 30 mol% or more, even more preferably 31.5 mol% or more, even more preferably 32 mol% or more, and particularly preferably 33 mol% or more. The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 38 mol% or less, more preferably 37 mol% or less, even more preferably 36.5 mol% or less, and particularly preferably 36 mol% or less. When the hydroxyl group content is at least the lower limit, the adhesive strength of the interlayer film is further increased. On the other hand, when the hydroxyl group content is at most the upper limit, the flexibility of the interlayer film is increased, making the interlayer film easier to handle.

[0070] When the layer X is a surface layer of an interlayer film, the preferred range of the hydroxyl group content of the polyvinyl acetal resin (4) is the same as the preferred range of the hydroxyl group content of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3).

[0071] From the viewpoint of further improving sound insulation, the hydroxyl group content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl group content of the polyvinyl acetal resin (2). From the viewpoint of further improving sound insulation, the hydroxyl group content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl group content of the polyvinyl acetal resin (3). The absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (2) is defined as absolute value A, and the absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (3) is defined as absolute value B. From the viewpoint of further improving sound insulation, the absolute values ​​A and B are each preferably 1 mol% or more, more preferably 5 mol% or more, even more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. The absolute value A and the absolute value B are each preferably 20 mol % or less.

[0072] When the layer X is not a surface layer of an interlayer film, from the viewpoint of further enhancing sound insulation, the hydroxyl group content of the polyvinyl acetal resin (4) is preferably lower than the hydroxyl group content of the polyvinyl acetal resin (2). When the layer X is not a surface layer of an interlayer film, from the viewpoint of further enhancing sound insulation, the hydroxyl group content of the polyvinyl acetal resin (4) is preferably lower than the hydroxyl group content of the polyvinyl acetal resin (3). The absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (4) and the hydroxyl group content of the polyvinyl acetal resin (2) is defined as absolute value C, and the absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (4) and the hydroxyl group content of the polyvinyl acetal resin (3) is defined as absolute value D. From the viewpoint of further improving sound insulation, the absolute value C and the absolute value D are each preferably 1 mol % or more, more preferably 5 mol % or more, even more preferably 9 mol % or more, particularly preferably 10 mol % or more, and most preferably 12 mol % or more. The absolute value C and the absolute value D are each preferably 20 mol % or less.

[0073] When the layer X is a surface layer of an interlayer film, from the viewpoint of further improving sound insulation, the hydroxyl group content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl group content of the polyvinyl acetal resin (4). When the layer X is a surface layer of an interlayer film, from the viewpoint of further improving sound insulation, it is preferable to satisfy the following absolute values. The absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (4) is preferably 1 mol% or more, more preferably 5 mol% or more, even more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. The absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (4) is preferably 20 mol% or less.

[0074] The hydroxyl group content of the polyvinyl acetal resin is a molar fraction calculated by dividing the amount of ethylene groups having hydroxyl groups by the total amount of ethylene groups in the main chain, and is expressed as a percentage. The amount of ethylene groups having hydroxyl groups can be measured, for example, in accordance with JIS K6728 "Testing Methods for Polyvinyl Butyral."

[0075] The degree of acetylation (amount of acetyl groups) of the polyvinyl acetal resin (0) is preferably 0.1 mol% or more, more preferably 0.3 mol% or more, even more preferably 0.5 mol% or more, and is preferably 30 mol% or less, more preferably 25 mol% or less, even more preferably 20 mol% or less. When the degree of acetylation is equal to or greater than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is improved. When the degree of acetylation is equal to or less than the upper limit, the moisture resistance of the interlayer film and laminated glass is improved.

[0076] The degree of acetylation (amount of acetyl groups) of the polyvinyl acetal resin (1) is preferably 0.01 mol% or more, more preferably 0.1 mol% or more, even more preferably 7 mol% or more, even more preferably 9 mol% or more, preferably 30 mol% or less, more preferably 25 mol% or less, even more preferably 24 mol% or less, and particularly preferably 20 mol% or less. When the degree of acetylation is at least the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is improved. When the degree of acetylation is at most the upper limit, the moisture resistance of the interlayer film and laminated glass is improved. In particular, when the degree of acetylation of the polyvinyl acetal resin (1) is 0.1 mol% or more and 25 mol% or less, excellent penetration resistance is achieved.

[0077] When the layer X is not a surface layer of an interlayer film, the preferred range of the degree of acetylation of the polyvinyl acetal resin (4) is the same as the preferred range of the degree of acetylation of the polyvinyl acetal resin (1).

[0078] The acetylation degree (acetyl group amount) of each of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 0.01 mol% or more, more preferably 0.5 mol% or more, and preferably 10 mol% or less, more preferably 2 mol% or less. When the acetylation degree is equal to or greater than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is improved. When the acetylation degree is equal to or less than the upper limit, the moisture resistance of the interlayer film and the laminated glass is improved.

[0079] When the layer X is a surface layer of an interlayer film, the preferred range of the acetylation degree of the polyvinyl acetal resin (4) is the same as the preferred range of the acetylation degree of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3).

[0080] The degree of acetylation is a molar fraction calculated by dividing the amount of ethylene groups having acetyl groups by the total amount of ethylene groups in the main chain, and is expressed as a percentage. The amount of ethylene groups having acetyl groups can be measured, for example, in accordance with JIS K6728 "Testing Methods for Polyvinyl Butyral."

[0081] The degree of acetalization of the polyvinyl acetal resin (0) (the degree of butyralization in the case of a polyvinyl butyral resin) is preferably 60 mol% or more, more preferably 63 mol% or more, and preferably 85 mol% or less, more preferably 75 mol% or less, and even more preferably 70 mol% or less. When the degree of acetalization is equal to or greater than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is increased. When the degree of acetalization is equal to or less than the upper limit, the reaction time required to produce the polyvinyl acetal resin is shortened.

[0082] The degree of acetalization of the polyvinyl acetal resin (1) (the degree of butyralization in the case of a polyvinyl butyral resin) is preferably 47 mol% or more, more preferably 60 mol% or more, and preferably 85 mol% or less, more preferably 80 mol% or less, and even more preferably 75 mol% or less. When the degree of acetalization is equal to or greater than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is increased. When the degree of acetalization is equal to or less than the upper limit, the reaction time required to produce the polyvinyl acetal resin is shortened.

[0083] When the layer X is not a surface layer of an interlayer film, the preferred range of the degree of acetalization of the polyvinyl acetal resin (4) is the same as the preferred range of the degree of acetalization of the polyvinyl acetal resin (1).

[0084] The degree of acetalization of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) (the degree of butyralization in the case of a polyvinyl butyral resin) is preferably 55 mol% or more, more preferably 60 mol% or more, and preferably 75 mol% or less, more preferably 71 mol% or less. When the degree of acetalization is equal to or greater than the lower limit, the compatibility of the polyvinyl acetal resin with the plasticizer is increased. When the degree of acetalization is equal to or less than the upper limit, the reaction time required to produce the polyvinyl acetal resin is shortened.

[0085] When the layer X is a surface layer of an interlayer film, the preferred range of the degree of acetalization of the polyvinyl acetal resin (4) is the same as the preferred range of the degree of acetalization of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3).

[0086] The degree of acetalization is determined as follows. First, the amount of ethylene groups to which hydroxyl groups are bonded and the amount of ethylene groups to which acetyl groups are bonded are subtracted from the total amount of ethylene groups in the main chain to determine the value. The obtained value is divided by the total amount of ethylene groups in the main chain to determine the molar fraction. The value expressed as a percentage of this molar fraction is the degree of acetalization.

[0087] The hydroxyl group content (hydroxyl group amount), acetalization degree (butyralization degree), and acetylation degree are preferably calculated from the results of measurements made in accordance with JIS K6728 "Testing Methods for Polyvinyl Butyral." However, measurements made in accordance with ASTM D1396-92 may also be used. When the polyvinyl acetal resin is a polyvinyl butyral resin, the hydroxyl group content (hydroxyl group amount), acetalization degree (butyralization degree), and acetylation degree can be calculated from the results of measurements made in accordance with JIS K6728 "Testing Methods for Polyvinyl Butyral."

[0088] The content of polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the interlayer film is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, even more preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. The content of polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the interlayer film is preferably 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin of the interlayer film is preferably polyvinyl acetal resin.

[0089] The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the first layer is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, even more preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the first layer is preferably 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin in the first layer is preferably polyvinyl acetal resin.

[0090] The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the second layer is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, even more preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the second layer is preferably 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin in the second layer is preferably polyvinyl acetal resin.

[0091] The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the third layer is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, even more preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the third layer is preferably 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin in the third layer is preferably polyvinyl acetal resin.

[0092] The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the layer X is preferably 10% by weight or more, more preferably 30% by weight or more, even more preferably 50% by weight or more, even more preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more. The content of the polyvinyl acetal resin in 100% by weight of the thermoplastic resin contained in the layer X is preferably 100% by weight or less. The main component (50% by weight or more) of the thermoplastic resin of the layer X is preferably polyvinyl acetal resin.

[0093] (Plasticizer) The interlayer film contains a plasticizer (hereinafter, may be referred to as plasticizer (0)). The first layer preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (1)). The second layer preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (2)). The third layer preferably contains a plasticizer (hereinafter, may be referred to as plasticizer (3)). When the thermoplastic resin contained in the interlayer film is a polyvinyl acetal resin, it is particularly preferable that the interlayer film (each layer) contains a plasticizer. The layer containing a polyvinyl acetal resin preferably contains a plasticizer.

[0094] There are a variety of plasticizers, as shown below.

[0095] Examples of the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, organic phosphate plasticizers, and organic phosphite plasticizers. The plasticizer is preferably an organic ester plasticizer. The plasticizer is preferably a liquid plasticizer.

[0096] Examples of the monobasic organic acid ester include glycol esters obtained by reacting glycol with a monobasic organic acid. Examples of the glycol include triethylene glycol, tetraethylene glycol, and tripropylene glycol. Examples of the monobasic organic acid include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptyl acid, n-octylic acid, 2-ethylhexyl acid, n-nonylic acid, decylic acid, and benzoic acid.

[0097] Examples of the polybasic organic acid ester include ester compounds of a polybasic organic acid and an alcohol having a linear or branched structure and having 4 to 8 carbon atoms. Examples of the polybasic organic acid include adipic acid, sebacic acid, and azelaic acid.

[0098] Examples of the organic ester plasticizer include triethylene glycol di-2-ethylpropanoate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dicaprylate, triethylene glycol di-n-octanoate, triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethylbutyrate, 1,3-propylene glycol di-2-ethylbutyrate, 1,4-butylene glycol di-2-ethylbutyrate, and diethylene glycol di-2-ethylbutylene. Examples of suitable organic ester plasticizers include diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylpentanoate, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol dicaprylate, diethylene glycol dibenzoate, dipropylene glycol dibenzoate, dihexyl adipate, dioctyl adipate, hexylcyclohexyl adipate, a mixture of heptyl adipate and nonyl adipate, diisononyl adipate, diisodecyl adipate, heptylnonyl adipate, dibutyl sebacate, oil-modified alkyd sebacate, and a mixture of a phosphate ester and an adipate. Organic ester plasticizers other than those listed above may also be used as the organic ester plasticizer. Furthermore, adipate esters other than the above-mentioned adipate esters may also be used as the adipate ester.

[0099] Examples of the organic phosphoric acid plasticizer include tributoxyethyl phosphate, isodecylphenyl phosphate, and triisopropyl phosphate.

[0100] Among various plasticizers, the present invention uses a plasticizer having a solubility parameter (SP value) of 18.0 (J / cm ３ ) ０．５ a plasticizer (first plasticizer) having a solubility parameter (SP value) of less than 18.0 (J / cm ３ ) ０．５The above plasticizer (second plasticizer) is used.

[0101] The solubility parameters (SP values) of the plasticizers (the first plasticizer and the second plasticizer) can be calculated as follows. First, the Hansen solubility parameters (dispersion term (dD), polarization term (dP), and hydrogen bond term (dH)) are calculated from the molecular structure of the plasticizer using the Y-MB function of the software "HSPiP." Next, the Hildebrand solubility parameter (δ) is calculated from the obtained Hansen solubility parameters (dispersion term (dD), polarization term (dP), and hydrogen bond term (dH)) using the following formula (2). This Hildebrand solubility parameter (δ) is defined as the solubility parameter (SP value) of the plasticizer.

[0102] SP value (δ) = ((dD) ２ + (dP) ２ + (dH) ２ ) ０．５ ...Formula (2)

[0103] <First plasticizer> The interlayer film has a solubility parameter (SP value) of 18.0 (J / cm ３ ) ０．５ The first plasticizer has a polarity of less than 1.0 V (hereinafter, sometimes referred to as first plasticizer (0)). The first plasticizer has a relatively low polarity. The first layer preferably contains the first plasticizer (hereinafter, sometimes referred to as first plasticizer (1)). The second layer preferably contains the first plasticizer (hereinafter, sometimes referred to as first plasticizer (2)). The third layer preferably contains the first plasticizer (hereinafter, sometimes referred to as first plasticizer (3)). Layer X contains the first plasticizer (hereinafter, sometimes referred to as first plasticizer (4)). The first plasticizer (1), the first plasticizer (2), the first plasticizer (3), and the first plasticizer (4) may be the same or different. The first plasticizer may be used alone or in combination of two or more kinds.

[0104] The solubility parameter (SP value) of the first plasticizer is preferably 15.0 (J / cm ３ ) ０．５More preferably, 16.0 (J / cm ３ ) ０．５ or more, preferably 17.5 (J / cm ３ ) ０．５ When the solubility parameter (SP value) of the first plasticizer is equal to or greater than the above lower limit and equal to or less than the above upper limit, the effects of the present invention can be more effectively exhibited.

[0105] Examples of the first plasticizer include triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH), triethylene glycol di-n-butanoate, etc. Note that a plasticizer other than the above-mentioned plasticizers may also be used as the first plasticizer.

[0106] The first plasticizer is preferably triethylene glycol di-2-ethylhexanoate, triethylene glycol di-2-ethylbutyrate, or triethylene glycol di-n-butanoate, in which case the effects of the present invention can be more effectively exhibited.

[0107] The content of the first plasticizer (0) in the interlayer film relative to 100 parts by weight of the thermoplastic resin (0) is defined as the first content (0). The first content (0) is preferably 2 parts by weight or more, more preferably 8 parts by weight or more, even more preferably 15 parts by weight or more, and preferably 80 parts by weight or less, more preferably 50 parts by weight or less, and even more preferably 35 parts by weight or less. When the first content (0) is equal to or greater than the lower limit, the penetration resistance of the laminated glass is further improved, and the handleability of the interlayer film can be further improved. When the first content (0) is equal to or less than the upper limit, the transparency of the interlayer film is further improved, and color transfer can be more effectively suppressed.

[0108] In the first layer, the content of the first plasticizer (1) relative to 100 parts by weight of the thermoplastic resin (1) is referred to as the first content (1). The first content (1) is preferably 15 parts by weight or more, more preferably 20 parts by weight or more, even more preferably 30 parts by weight or more, and is preferably 80 parts by weight or less, more preferably 70 parts by weight or less, even more preferably 60 parts by weight or less, and particularly preferably 50 parts by weight or less. When the first content (1) is equal to or greater than the lower limit, the flexibility of the interlayer film is increased, and the handleability of the interlayer film can be further improved. When the first content (1) is equal to or less than the upper limit, the penetration resistance of the laminated glass is further increased, and color transfer can be more effectively suppressed.

[0109] When the layer X is not a surface layer of the interlayer film, the preferred range of the content of the first plasticizer (4) (hereinafter, may be referred to as the first content (4)) relative to 100 parts by weight of the thermoplastic resin (4) in the layer X is the same as the preferred range of the first content (1).

[0110] In the second layer, the content of the first plasticizer (2) per 100 parts by weight of the thermoplastic resin (2) is referred to as the first content (2). In the third layer, the content of the first plasticizer (3) per 100 parts by weight of the thermoplastic resin (3) is referred to as the first content (3). The first content (2) and the first content (3) are each preferably 2 parts by weight or more, more preferably 4 parts by weight or more, even more preferably 8 parts by weight or more, even more preferably 12 parts by weight or more, particularly preferably 15 parts by weight or more, and most preferably 20 parts by weight or more. The first content (2) and the first content (3) are each preferably 36 parts by weight or less, more preferably 32 parts by weight or less, even more preferably 28 parts by weight or less, particularly preferably 26 parts by weight or less, and most preferably 24 parts by weight or less. When the first content (2) and the first content (3) are equal to or greater than the lower limit, the flexibility of the interlayer film is increased, and the handleability of the interlayer film can be further improved. When the first content (2) and the first content (3) are equal to or less than the upper limit, the penetration resistance of the laminated glass is further increased, and color transfer can be further effectively suppressed.

[0111] When the layer X is a surface layer of an interlayer film, the preferred range of the content of the first plasticizer (4) (hereinafter, may be referred to as the first content (4)) relative to 100 parts by weight of the thermoplastic resin (4) in the layer X is the same as the preferred ranges of the first content (2) and the first content (3).

[0112] In order to improve the sound insulation of the laminated glass, the first content (1) is preferably greater than the first content (2), and the first content (1) is preferably greater than the first content (3).

[0113] When the layer X is not a surface layer of an interlayer film, in order to improve the sound insulation of the laminated glass, the first content (4) is preferably greater than the first content (2), and the first content (4) is preferably greater than the first content (3).

[0114] When the layer X is a surface layer of an interlayer film, the first content (1) is preferably greater than the first content (4) in order to improve the sound insulation of the laminated glass.

[0115] From the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the first content (2) and the first content (1) and the absolute value of the difference between the first content (3) and the first content (1) are each preferably 10 parts by weight or more, more preferably 15 parts by weight or more, and even more preferably 20 parts by weight or more. The absolute value of the difference between the first content (2) and the first content (1) and the absolute value of the difference between the first content (3) and the first content (1) are each preferably 78 parts by weight or less, more preferably 75 parts by weight or less, and even more preferably 70 parts by weight or less.

[0116] When the layer X is not a surface layer of an interlayer film, from the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the first content (2) and the first content (4) and the absolute value of the difference between the first content (3) and the first content (4) are each preferably 10 parts by weight or more, more preferably 15 parts by weight or more, and even more preferably 20 parts by weight or more. The absolute value of the difference between the first content (2) and the first content (4) and the absolute value of the difference between the first content (3) and the first content (4) are each preferably 78 parts by weight or less, more preferably 75 parts by weight or less, and even more preferably 70 parts by weight or less.

[0117] When the layer X is a surface layer of an interlayer film, from the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the first content (4) and the first 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 first content (4) and the first content (1) is preferably 78 parts by weight or less, more preferably 75 parts by weight or less, and even more preferably 70 parts by weight or less.

[0118] <Second plasticizer> The interlayer film has a solubility parameter (SP value) of 18.0 (J / cm ３ ) ０．５ The second plasticizer has a relatively high polarity. The first layer preferably contains the second plasticizer (hereinafter may be referred to as second plasticizer (1)). The second layer preferably contains the second plasticizer (hereinafter may be referred to as second plasticizer (2)). The third layer preferably contains the second plasticizer (hereinafter may be referred to as second plasticizer (3)). Layer X contains the second plasticizer (hereinafter may be referred to as second plasticizer (4)). The second plasticizer (1), the second plasticizer (2), the second plasticizer (3), and the second plasticizer (4) may be the same or different. The second plasticizer may be used alone or in combination of two or more kinds.

[0119] The solubility parameter (SP value) of the second plasticizer is preferably 18.5 (J / cm ３ ) ０．５ More preferably, 20.0 (J / cm ３ ) ０．５ More than 30.0 (J / cm ３ ) ０．５ or less, more preferably 29.0 (J / cm ３ ) ０．５ When the solubility parameter (SP value) of the second plasticizer is equal to or greater than the above lower limit and equal to or less than the above upper limit, the effects of the present invention can be more effectively exhibited.

[0120] The absolute value of the difference between the solubility parameter (SP value) of the second plasticizer and the solubility parameter of the first plasticizer is preferably 0.5 (J / cm ３ ) ０．５ More preferably, 1.5 (J / cm ３ ) ０．５ More preferably, 4.0 (J / cm ３ ) ０．５ or more, preferably 15.0 (J / cm ３ ) ０．５ or less, more preferably 12.0 (J / cm ３ ) ０．５ More preferably, 9.0 (J / cm ３ ) ０．５ When the absolute value of the difference is equal to or greater than the lower limit and equal to or less than the upper limit, the effects of the present invention can be more effectively exhibited.

[0121] Examples of the second plasticizer include trimethylolpropane, triethylene glycol, 3-(2-ethylhexyloxy)-1,2-propanediol, polycaprolactone triol represented by the following formula (P), 1,4-butanediol, diethylene glycol, dipropylene glycol, triethylene glycol monomethyl ether, and triethylene glycol dimethyl ether. Note that a plasticizer other than the above-mentioned plasticizers may also be used as the second plasticizer.

[0122]

[0123] In the above formula (P), R１ ~R ３ Each of R represents a group represented by the following formula (P1). １ ~R ３ may be the same group or different groups.

[0124]

[0125] In the above formula (P1), n ​​represents a number of 1 or more and 5 or less, and * represents the bonding position with the oxygen atom.

[0126] In the formula (P1), n ​​is preferably 2 or more, preferably 4 or less, and more preferably 3 or less. When n is equal to or more than the above lower limit and equal to or less than the above upper limit, the solubility parameter (SP value) tends to satisfy the above-mentioned preferred range.

[0127] The second plasticizer is preferably trimethylolpropane, triethylene glycol, 3-(2-ethylhexyloxy)-1,2-propanediol, or polycaprolactone triol represented by formula (P). In this case, the effects of the present invention can be more effectively exhibited.

[0128] The content of the second plasticizer (0) in the interlayer film relative to 100 parts by weight of the thermoplastic resin (0) is defined as the second content (0). The second content (0) is preferably 2 parts by weight or more, more preferably 8 parts by weight or more, even more preferably 15 parts by weight or more, and preferably 80 parts by weight or less, more preferably 50 parts by weight or less, and even more preferably 35 parts by weight or less. When the second content (0) is equal to or greater than the lower limit, the penetration resistance of the laminated glass is further improved, and color transfer can be more effectively suppressed. When the second content (0) is equal to or less than the upper limit, the transparency of the interlayer film is further improved, and the handleability of the interlayer film can be further improved.

[0129] In the first layer, the content of the second plasticizer (1) relative to 100 parts by weight of the thermoplastic resin (1) is referred to as the second content (1). The second content (1) is preferably 15 parts by weight or more, more preferably 20 parts by weight or more, even more preferably 30 parts by weight or more, and is preferably 80 parts by weight or less, more preferably 70 parts by weight or less, even more preferably 60 parts by weight or less, and particularly preferably 50 parts by weight or less. When the second content (1) is equal to or greater than the lower limit, the penetration resistance of the laminated glass is further improved, and color transfer can be more effectively suppressed. When the second content (1) is equal to or less than the upper limit, the transparency of the interlayer film is further improved, and the handleability of the interlayer film can be further improved.

[0130] When the layer X is not a surface layer of the interlayer film, the preferred range of the content of the second plasticizer (4) (hereinafter, may be referred to as the second content (4)) relative to 100 parts by weight of the thermoplastic resin (4) in the layer X is the same as the preferred range of the second content (1).

[0131] In the second layer, the content of the second plasticizer (2) per 100 parts by weight of the thermoplastic resin (2) is referred to as the second content (2). In the third layer, the content of the second plasticizer (3) per 100 parts by weight of the thermoplastic resin (3) is referred to as the second content (3). The second content (2) and the second content (3) are each preferably 2 parts by weight or more, more preferably 4 parts by weight or more, even more preferably 8 parts by weight or more, even more preferably 12 parts by weight or more, particularly preferably 15 parts by weight or more, and most preferably 20 parts by weight or more. The second content (2) and the second content (3) are each preferably 36 parts by weight or less, more preferably 32 parts by weight or less, even more preferably 28 parts by weight or less, particularly preferably 26 parts by weight or less, and most preferably 24 parts by weight or less. When the second content (2) and the second content (3) are equal to or greater than the lower limit, color transfer can be more effectively suppressed. When the second content (2) and the second content (3) are equal to or less than the upper limit, the penetration resistance of the laminated glass is further improved, and the flexibility of the interlayer film is increased, thereby further improving the handleability of the interlayer film.

[0132] When the layer X is a surface layer of an interlayer film, the preferred range of the content of the second plasticizer (4) (hereinafter, may be referred to as the second content (4)) relative to 100 parts by weight of the thermoplastic resin (4) in the layer X is the same as the preferred ranges of the second content (2) and the second content (3).

[0133] In order to improve the sound insulation of the laminated glass, the second content (1) is preferably greater than the second content (2), and the second content (1) is preferably greater than the second content (3).

[0134] When the layer X is not a surface layer of an interlayer film, in order to enhance the sound insulation of the laminated glass, the second content (4) is preferably greater than the second content (2), and the second content (4) is preferably greater than the second content (3).

[0135] When the layer X is a surface layer of an interlayer film, the second content (1) is preferably greater than the second content (4) in order to improve the sound insulation of the laminated glass.

[0136] From the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the second content (2) and the second content (1) and the absolute value of the difference between the second content (3) and the second content (1) are each preferably 10 parts by weight or more, more preferably 15 parts by weight or more, and even more preferably 20 parts by weight or more. The absolute value of the difference between the second content (2) and the second content (1) and the absolute value of the difference between the second content (3) and the second content (1) are each preferably 78 parts by weight or less, more preferably 75 parts by weight or less, and even more preferably 70 parts by weight or less.

[0137] When the layer X is not a surface layer of an interlayer film, from the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the second content (2) and the second content (4) and the absolute value of the difference between the second content (3) and the second content (4) are each preferably 10 parts by weight or more, more preferably 15 parts by weight or more, and even more preferably 20 parts by weight or more. The absolute value of the difference between the second content (2) and the second content (4) and the absolute value of the difference between the second content (3) and the second content (4) are each preferably 78 parts by weight or less, more preferably 75 parts by weight or less, and even more preferably 70 parts by weight or less.

[0138] When the layer X is a surface layer of an interlayer film, from the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the second content (4) and the second 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 second content (4) and the second content (1) is preferably 78 parts by weight or less, more preferably 75 parts by weight or less, and even more preferably 70 parts by weight or less.

[0139] The content of the second plasticizer in the interlayer film, relative to 100% by weight of the plasticizer, is preferably 20% by weight or more, more preferably 25% by weight or more, even more preferably 40% by weight or more, and preferably 80% by weight or less, more preferably 75% by weight or less, and even more preferably 60% by weight or less. When the content of the second plasticizer is equal to or more than the above lower limit and equal to or less than the above upper limit, the effects of the present invention can be more effectively exhibited.

[0140] The content of the second plasticizer in 100% by weight of the plasticizer contained in the layer X is preferably 20% by weight or more, more preferably 25% by weight or more, even more preferably 40% by weight or more, and preferably 80% by weight or less, more preferably 75% by weight or less, and even more preferably 60% by weight or less. When the content of the second plasticizer is equal to or more than the above lower limit and equal to or less than the above upper limit, the effects of the present invention can be more effectively exhibited.

[0141] (Colorant) The interlayer film may or may not contain a colorant. The first layer may or may not contain a colorant. The second layer may or may not contain a colorant. The third layer may or may not contain a colorant. The layer X may or may not contain a colorant. By using the colorant, the interlayer film can be well colored to a desired color tone. Only one type of colorant may be used, or two or more types may be used in combination.

[0142] Examples of the colorant include pigments and dyes. The colorant may be a pigment, a dye, or both a pigment and a dye. Note that there are also colorants that are classified as both pigments and dyes.

[0143] Conventional interlayer films that include a layer containing a colorant and a layer not containing a colorant are particularly prone to color transfer. Furthermore, color transfer is particularly likely to occur when the colorant is a dye. In contrast, the interlayer film of the present invention can suppress color transfer even when the interlayer film includes a layer containing a colorant and a layer not containing a colorant, or even when the colorant is a dye.

[0144] The content of the colorant in 100% by weight of the layer containing the colorant (the first layer, the second layer, the third layer, or the layer X) is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, even more preferably 0.2% by weight or more, and preferably 1.5% by weight or less, and more preferably 1.0% by weight or less. When the content of the colorant is equal to or more than the above lower limit and equal to or less than the above upper limit, the interlayer film can be well colored to a desired color tone, and the effects of the present invention can be more effectively exhibited.

[0145] The content of the colorant in 100% by weight of the interlayer film is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, even more preferably 0.2% by weight or more, and preferably 1.5% by weight or less, and more preferably 1.0% by weight or less. When the content of the colorant is equal to or more than the above lower limit and equal to or less than the above upper limit, the interlayer film can be well colored to a desired color tone, and the effects of the present invention can be more effectively exhibited.

[0146] <Pigment> The colorant may contain a pigment or may be a pigment. The interlayer film may contain a pigment or may not contain a pigment. The first layer may contain a pigment or may not contain a pigment. The second layer may contain a pigment or may not contain a pigment. The third layer may contain a pigment or may not contain a pigment. The layer X may contain a pigment or may not contain a pigment. By using the pigment, the interlayer film can be well colored to a desired color tone. Only one type of pigment may be used, or two or more types may be used in combination.

[0147] The pigment may be an organic pigment or an inorganic pigment. The organic pigment may be an organic pigment having a metal atom or an organic pigment not having a metal atom. Only one type of the pigment may be used, or two or more types may be used in combination.

[0148] Examples of the organic pigment include phthalocyanine compounds, quinacridone compounds, azo compounds, pentaphene compounds, perylene compounds, indole compounds, threne compounds, diketopyrrolopyrrole compounds, anthraquinone compounds, perinone compounds, indanthrene compounds, indigo compounds, isoindolinone compounds, nickel complex compounds, methine compounds, azomethine compounds, and dioxazine compounds.

[0149] The content of the pigment in 100% by weight of the layer containing the pigment (the first layer, the second layer, the third layer, or the layer X) is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, even more preferably 0.2% by weight or more, and preferably 1.5% by weight or less, and more preferably 1% by weight or less. When the content of the pigment is equal to or more than the above lower limit and equal to or less than the above upper limit, the interlayer film can be well colored to a desired color tone, and the effects of the present invention can be more effectively exhibited.

[0150] The content of the pigment in 100% by weight of the interlayer film is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, even more preferably 0.2% by weight or more, and preferably 1.5% by weight or less, and more preferably 1.0% by weight or less. When the content of the pigment is equal to or more than the above lower limit and equal to or less than the above upper limit, the interlayer film can be well colored to a desired color tone, and the effects of the present invention can be more effectively exhibited.

[0151] <Dye> The colorant may contain a dye or may be a dye. The interlayer film may or may not contain a dye. The first layer may or may not contain a dye. The second layer may or may not contain a dye. The third layer may or may not contain a dye. The layer X may or may not contain a dye. By using the dye, the interlayer film can be well colored to a desired color tone. Only one type of the dye may be used, or two or more types may be used in combination.

[0152] Examples of the dye include perylene compounds, threne compounds, quinacridone compounds, diketopyrrolopyrrole compounds, anthraquinone compounds, perinone compounds, phthalocyanine compounds, indanthrene compounds, indigo compounds, isoindolinone compounds, nickel complex compounds, methine compounds, azomethine compounds, and dioxazines.

[0153] The molecular weight of the dye may be 100 or more, 200 or more, 300 or more, or 1,000 or less, 800 or less, or 500 or less. Conventional interlayer films containing dyes with low molecular weights (e.g., dyes with a molecular weight of 500 or less) are particularly prone to color transfer. In contrast, the interlayer film of the present invention can suppress color transfer even when the interlayer film contains a dye with a low molecular weight.

[0154] The content of the dye in 100% by weight of the layer containing the dye (the first layer, the second layer, the third layer, or the layer X) is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, and preferably 1.5% by weight or less, and more preferably 1% by weight or less. When the content of the dye is equal to or more than the above lower limit and equal to or less than the above upper limit, the interlayer film can be well colored to a desired color tone, and the effects of the present invention can be more effectively exhibited.

[0155] The content of the dye in 100% by weight of the interlayer film is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, and preferably 1.5% by weight or less, and more preferably 1% by weight or less. When the content of the dye is equal to or more than the above lower limit and equal to or less than the above upper limit, the interlayer film can be well colored to a desired color tone, and the effects of the present invention can be more effectively exhibited.

[0156] (Heat-shielding material) The intermediate film preferably contains a heat-shielding material. The first layer preferably contains a heat-shielding material. The second layer preferably contains a heat-shielding material. The third layer preferably contains a heat-shielding material. The layer X preferably contains a heat-shielding material. Only one type of heat-shielding material may be used, or two or more types may be used in combination.

[0157] The heat-shielding material preferably contains at least one component X selected from a phthalocyanine compound, a naphthalocyanine compound, and an anthracyanine compound, or contains heat-shielding particles. In this case, the heat-shielding material may contain both the component X and the heat-shielding particles.

[0158] Component X: The interlayer film preferably contains at least one component X selected from a phthalocyanine compound, a naphthalocyanine compound, and an anthracyanine compound. The first layer preferably contains the component X. The second layer preferably contains the component X. The third layer preferably contains the component X. The layer X preferably contains the component X. The component X is a heat-shielding material. Only one type of component X may be used, or two or more types may be used in combination.

[0159] There are no particular restrictions on the component X. As the component X, conventionally known phthalocyanine compounds, naphthalocyanine compounds, and anthracyanine compounds can be used.

[0160] Examples of the component X include phthalocyanine, phthalocyanine derivatives, naphthalocyanine, naphthalocyanine derivatives, anthracyanine, and anthracyanine derivatives. The phthalocyanine compound and the phthalocyanine derivative preferably have a phthalocyanine skeleton. The naphthalocyanine compound and the naphthalocyanine derivative preferably have a naphthalocyanine skeleton. The anthracyanine compound and the anthracyanine derivative preferably have an anthracyanine skeleton.

[0161] From the viewpoint of further improving the heat-shielding properties of the interlayer film and laminated glass, the component X is preferably at least one selected from the group consisting of phthalocyanine, phthalocyanine derivatives, naphthalocyanine, and naphthalocyanine derivatives, and more preferably at least one of phthalocyanine and phthalocyanine derivatives.

[0162] From the viewpoint of effectively improving the heat-shielding properties and maintaining a higher visible light transmittance for a long period of time, the component X preferably contains a vanadium atom or a copper atom. The component X preferably contains a vanadium atom, and also preferably contains a copper atom. The component X is more preferably at least one of a phthalocyanine containing a vanadium atom or a copper atom and a derivative of a phthalocyanine containing a vanadium atom or a copper atom. From the viewpoint of further improving the heat-shielding properties of the interlayer film and laminated glass, the component X preferably has a structural unit in which an oxygen atom is bonded to a vanadium atom.

[0163] The content of component X in 100 wt% of the interlayer film or in 100 wt% of the layer containing component X (first layer, second layer, third layer, or Layer X) is preferably 0.001 wt% or more, more preferably 0.005 wt% or more, even more preferably 0.01 wt% or more, and particularly preferably 0.02 wt% or more. The content of component X in 100 wt% of the interlayer film or in 100 wt% of the layer containing component X (first layer, second layer, third layer, or Layer X) is preferably 0.2 wt% or less, more preferably 0.1 wt% or less, even more preferably 0.05 wt% or less, and particularly preferably 0.04 wt% or less. When the content of component X is at least the above lower limit and at most the above upper limit, the heat-shielding properties and the visible light transmittance are sufficiently high. For example, it is possible to achieve a visible light transmittance of 70% or more.

[0164] Heat-shielding particles: The intermediate film preferably contains heat-shielding particles. The first layer preferably contains heat-shielding particles. The second layer preferably contains heat-shielding particles. The third layer preferably contains heat-shielding particles. The layer X preferably contains heat-shielding particles. The heat-shielding particles are a heat-shielding material. The use of heat-shielding particles can effectively block infrared rays (heat rays). Only one type of the heat-shielding particles may be used, or two or more types may be used in combination.

[0165] From the viewpoint of further enhancing the heat-shielding properties of the laminated glass, the heat-shielding particles are more preferably metal oxide particles, and the heat-shielding particles are preferably particles formed from a metal oxide (metal oxide particles).

[0166] Infrared rays, which have wavelengths of 780 nm or more, which are longer than visible light, have a smaller amount of energy than ultraviolet rays. However, infrared rays have a large thermal effect, and when infrared rays are absorbed by a substance, they are released as heat. For this reason, infrared rays are generally called heat rays. By using the above heat-shielding particles, infrared rays (heat rays) can be effectively blocked. Here, heat-shielding particles refer to particles that can absorb infrared rays.

[0167] Specific examples of the heat-shielding particles include metal oxide particles such as aluminum-doped tin oxide particles, indium-doped tin oxide particles, antimony-doped tin oxide particles (ATO particles), gallium-doped zinc oxide particles (GZO particles), indium-doped zinc oxide particles (IZO particles), aluminum-doped zinc oxide particles (AZO particles), niobium-doped titanium oxide particles, 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, and silicon-doped zinc oxide particles; ６ ) particles, etc. Heat-shielding particles other than these may also be used. Metal oxide particles are preferred because of their high heat-ray shielding function, and ATO particles, GZO particles, IZO particles, ITO particles, or tungsten oxide particles are more preferred, with ITO particles or tungsten oxide particles being particularly preferred. In particular, tin-doped indium oxide particles (ITO particles) are preferred because of their high heat-ray shielding function and ease of availability, and tungsten oxide particles are also preferred.

[0168] From the viewpoint of further improving the heat-shielding properties of the interlayer film and laminated glass, the tungsten oxide particles are preferably metal-doped tungsten oxide particles. The "tungsten oxide particles" include metal-doped tungsten oxide particles. Specific examples of the metal-doped tungsten oxide particles include sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, and rubidium-doped tungsten oxide particles.

[0169] From the viewpoint of further improving the heat-shielding properties of the interlayer film and laminated glass, cesium-doped tungsten oxide particles are particularly preferred. From the viewpoint of further improving the heat-shielding properties of the interlayer film and laminated glass, the cesium-doped tungsten oxide particles are represented by the formula: Cs ０．３３ WO ３ Preferably, the tungsten oxide particles are represented by the formula:

[0170] The average particle size of the heat-shielding particles is preferably 0.01 μm or more, more preferably 0.02 μm or more, and preferably 0.1 μm or less, more preferably 0.05 μm or less. When the average particle size is equal to or greater than the lower limit, the heat ray shielding property is sufficiently high. When the average particle size is equal to or less than the upper limit, the dispersibility of the heat-shielding particles is high.

[0171] The "average particle size" refers to the volume average particle size. The average particle size can be measured using a particle size distribution analyzer ("UPA-EX150" manufactured by Nikkiso Co., Ltd.) or the like.

[0172]

[0033] The content of the heat-shielding particles (particularly the content of tungsten oxide particles) in 100 weight % of the interlayer film or in 100 weight % of the layer containing the heat-shielding particles (first layer, second layer, third layer, or layer X) is preferably 0.01 weight % or more, more preferably 0.1 weight % or more, even more preferably 1 weight % or more, and particularly preferably 1.5 weight % or more. The content of the heat-shielding particles (particularly the content of tungsten oxide particles) in 100 weight % of the interlayer film or in 100 weight % of the layer containing the heat-shielding particles (first layer, second layer, third layer, or layer X) is preferably 6 weight % or less, more preferably 5.5 weight % or less, even more preferably 4 weight % or less, particularly preferably 3.5 weight % or less, and most preferably 3 weight % or less. When the content of the heat-shielding particles is at least the above lower limit and at most the above upper limit, the heat shielding property is sufficiently high and the visible light transmittance is sufficiently high.

[0173] (Metal Salt) The interlayer film preferably contains at least one metal salt of an alkali metal salt and an alkaline earth metal salt (hereinafter, sometimes referred to as metal salt M). The first layer preferably contains the metal salt M. The second layer preferably contains the metal salt M. The third layer preferably contains the metal salt M. The layer X preferably contains the metal salt M. Note that alkaline earth metals refer to six metals: Be, Mg, Ca, Sr, Ba, and Ra. The use of the metal salt M makes it easy to control the adhesion between the interlayer film and a laminated glass member such as a glass plate, or the adhesion between each layer in the interlayer film. Only one type of metal salt M may be used, or two or more types may be used in combination.

[0174] The metal salt M preferably contains at least one metal selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, and Ba. The metal salt M contained in the interlayer film preferably contains at least one metal selected from the group consisting of K and Mg.

[0175] Furthermore, 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 as the metal salt M. The metal salt M may include a magnesium salt of a carboxylic acid having 2 to 16 carbon atoms or a potassium salt of a carboxylic acid having 2 to 16 carbon atoms.

[0176] Examples of the magnesium salts of carboxylic acids having 2 to 16 carbon atoms and the potassium salts of carboxylic acids having 2 to 16 carbon atoms include magnesium acetate, potassium acetate, magnesium propionate, potassium propionate, magnesium 2-ethylbutyrate, potassium 2-ethylbutanoate, magnesium 2-ethylhexanoate, and potassium 2-ethylhexanoate.

[0177] The total content of Mg and K in the interlayer film containing the metal salt M or in the layer (first layer, second layer, third layer, or layer X) containing the metal salt M is preferably 5 ppm or more, more preferably 10 ppm or more, even more preferably 20 ppm or more, and is preferably 300 ppm or less, more preferably 250 ppm or less, and even more preferably 200 ppm or less. When the total content of Mg and K is at least the above lower limit and at most the above upper limit, the adhesion between the interlayer film and the laminated glass member (e.g., glass plates) or the adhesion between the layers in the interlayer film can be more effectively controlled.

[0178] (Ultraviolet Shielding Agent) The interlayer film preferably contains an ultraviolet ray shielding agent. The first layer preferably contains an ultraviolet ray shielding agent. The second layer preferably contains an ultraviolet ray shielding agent. The third layer preferably contains an ultraviolet ray shielding agent. The layer X preferably contains an ultraviolet ray shielding agent. By using an ultraviolet ray shielding agent, the visible light transmittance of the interlayer film and the laminated glass is more unlikely to decrease even after long-term use. Only one type of ultraviolet ray shielding agent may be used, or two or more types may be used in combination.

[0179] The ultraviolet screening agent includes an ultraviolet absorbing agent, and the ultraviolet screening agent is preferably an ultraviolet absorbing agent.

[0180] Examples of the ultraviolet screening agent include ultraviolet screening agents containing metal atoms, ultraviolet screening agents containing metal oxides, ultraviolet screening agents having a benzotriazole structure (benzotriazole compounds), ultraviolet screening agents having a benzophenone structure (benzophenone compounds), ultraviolet screening agents having a triazine structure (triazine compounds), ultraviolet screening agents having a malonic acid ester structure (malonic acid ester compounds), ultraviolet screening agents having an oxalic acid anilide structure (oxalic acid anilide compounds), and ultraviolet screening agents having a benzoate structure (benzoate compounds).

[0181] Examples of the ultraviolet shielding agent containing the metal atom include platinum particles, platinum particles whose surfaces are coated with silica, palladium particles, and palladium particles whose surfaces are coated with silica. The ultraviolet shielding agent is preferably not a heat-shielding particle.

[0182] The ultraviolet screening agent is preferably an ultraviolet screening agent having a benzotriazole structure, an ultraviolet screening agent having a benzophenone structure, an ultraviolet screening agent having a triazine structure, or an ultraviolet screening agent having a benzoate structure, more preferably an ultraviolet screening agent having a benzotriazole structure or an ultraviolet screening agent having a benzophenone structure, and even more preferably an ultraviolet screening agent having a benzotriazole structure.

[0183] Examples of the ultraviolet screening agent containing a metal oxide include zinc oxide, titanium oxide, and cerium oxide. Furthermore, the surface of the ultraviolet screening agent containing a metal oxide may be coated. Examples of the coating material for the surface of the ultraviolet screening agent containing a metal oxide include insulating metal oxides, hydrolyzable organosilicon compounds, and silicone compounds.

[0184] Examples of the insulating metal oxide include silica, alumina, zirconia, etc. The insulating metal oxide has a band gap energy of, for example, 5.0 eV or more.

[0185] Examples of the ultraviolet screening agent having a benzotriazole structure include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole ("Tinuvin P" manufactured by BASF), 2-(2'-hydroxy-3',5'-di-t-butylphenyl)benzotriazole ("Tinuvin 320" manufactured by BASF), 2-(2'-hydroxy-3'-t-butyl-5-methylphenyl)-5-chlorobenzotriazole ("Tinuvin 326" manufactured by BASF), and 2-(2'-hydroxy-3',5'-di-amylphenyl)benzotriazole ("Tinuvin 328" manufactured by BASF). Due to their excellent ultraviolet screening performance, the ultraviolet screening agent is preferably an ultraviolet screening agent having a benzotriazole structure containing a halogen atom, and more preferably an ultraviolet screening agent having a benzotriazole structure containing a chlorine atom.

[0186] Examples of the ultraviolet screening agent having a benzophenone structure include octabenzone ("Chimassorb 81" manufactured by BASF).

[0187] Examples of the ultraviolet screening agent having a triazine structure include "LA-F70" manufactured by ADEKA Corporation and 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol ("Tinuvin 1577FF" manufactured by BASF).

[0188] Examples of the ultraviolet screening agent having a malonic acid ester structure include dimethyl 2-(p-methoxybenzylidene)malonate, tetraethyl-2,2-(1,4-phenylenedimethylidene)bismalonate, and 2-(p-methoxybenzylidene)-bis(1,2,2,6,6-pentamethyl-4-piperidinyl)malonate.

[0189] Commercially available ultraviolet screening agents having the malonic acid ester structure include Hostavin B-CAP, Hostavin PR-25, and Hostavin PR-31 (all manufactured by Clariant).

[0190] Examples of the ultraviolet screening agent having an oxalic acid anilide structure include oxalic acid diamides having an aryl group substituted on the nitrogen atom, such as N-(2-ethylphenyl)-N'-(2-ethoxy-5-t-butylphenyl)oxalic acid diamide, N-(2-ethylphenyl)-N'-(2-ethoxy-phenyl)oxalic acid diamide, and 2-ethyl-2'-ethoxy-oxalanilide ("Sanduvor VSU" manufactured by Clariant).

[0191] Examples of the ultraviolet screening agent having a benzoate structure include 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate ("Tinuvin 120" manufactured by BASF).

[0192] The content of the ultraviolet screening agent and the content of the benzotriazole compound in 100 wt% of the interlayer film or 100 wt% of the layer containing the ultraviolet screening agent (first layer, second layer, third layer, or Layer X) is preferably 0.1 wt% or more, more preferably 0.2 wt% or more, even more preferably 0.3 wt% or more, and particularly preferably 0.5 wt% or more. In this case, even after long-term use of the interlayer film and laminated glass, the visible light transmittance is even less likely to decrease. The content of the ultraviolet screening agent and the content of the benzotriazole compound in 100 wt% of the interlayer film or 100 wt% of the layer containing the ultraviolet screening agent (first layer, second layer, third layer, or Layer X) is preferably 2.5 wt% or less, more preferably 2 wt% or less, even more preferably 1 wt% or less, and particularly preferably 0.8 wt% or less. In particular, by ensuring that the content of the ultraviolet ray blocking agent is 0.2% by weight or more relative to 100% by weight of the layer containing the ultraviolet ray blocking agent, the visible light transmittance is even less likely to decrease even after long-term use of the interlayer film and laminated glass.

[0193] (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 X preferably contains an antioxidant. Only one type of antioxidant may be used, or two or more types may be used in combination.

[0194] Examples of the antioxidant include phenol-based antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants. The phenol-based antioxidants are antioxidants having a phenol skeleton. The sulfur-based antioxidants are antioxidants containing sulfur atoms. The phosphorus-based antioxidants are antioxidants containing phosphorus atoms.

[0195] The antioxidant is preferably a phenol-based antioxidant or a phosphorus-based antioxidant.

[0196] Examples of the phenolic antioxidant include 2,6-di-t-butyl-p-cresol (BHT), butylhydroxyanisole (BHA), 2,6-di-t-butyl-4-ethylphenol, stearyl-β-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, 2,2'-methylenebis-(4-methyl-6-butylphenol), 2,2'-methylenebis-(4-ethyl-6-t-butylphenol), 4,4'-butylidene-bis-(3-methyl-6-t-butylphenol), 1,1,3-tris-(2-methyl-hydroxy-5- Examples of antioxidants include tetrakis[methylene-3-(3',5'-butyl-4-hydroxyphenyl)propionate]methane, 1,3,3-tris-(2-methyl-4-hydroxy-5-t-butylphenol)butane, 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene, bis(3,3'-t-butylphenol)butyric acid glycol ester, and bis(3-t-butyl-4-hydroxy-5-methylbenzenepropanoate)ethylenebis(oxyethylene). One or more of these antioxidants are preferably used.

[0197] Examples of the phosphorus-based antioxidant include tridecyl phosphite, tris(tridecyl)phosphite, triphenyl phosphite, trinonylphenyl phosphite, bis(tridecyl)pentaerythritol diphosphite, bis(decyl)pentaerythritol diphosphite, tris(2,4-di-t-butylphenyl)phosphite, bis(2,4-di-t-butyl-6-methylphenyl)ethyl ester phosphorous acid, and 2,2'-methylenebis(4,6-di-t-butyl-1-phenyloxy)(2-ethylhexyloxy)phosphorus, etc. One or more of these antioxidants are preferably used.

[0198] Examples of commercially available antioxidants include "IRGANOX 245" manufactured by BASF, "IRGAFOS 168" manufactured by BASF, "IRGAFOS 38" manufactured by BASF, "Sumilizer BHT" manufactured by Sumitomo Chemical Co., Ltd., "H-BHT" manufactured by Sakai Chemical Industry Co., Ltd., and "IRGANOX 1010" manufactured by BASF.

[0199] In order to maintain a high visible light transmittance of the interlayer film and laminated glass for a long period of time, the content of the antioxidant in 100 wt% of the interlayer film or in 100 wt% of the layer containing the antioxidant (first layer, second layer, third layer, or layer X) is preferably 0.03 wt% or more, and more preferably 0.1 wt% or more. Furthermore, since the effect of adding the antioxidant becomes saturated, the content of the antioxidant in 100 wt% of the interlayer film or in 100 wt% of the layer containing the antioxidant is preferably 2 wt% or less.

[0200] (Other Components) The interlayer film, the first layer, the second layer, the third layer, and the layer X may each contain other components in addition to the above-mentioned components, as necessary. Examples of the other components include coupling agents, dispersants, surfactants, flame retardants, antistatic agents, adhesion modifiers other than metal salts, moisture-resistant agents, fluorescent brighteners, and infrared absorbers. These other components may each be used alone or in combination of two or more.

[0201] (Other Details of the Interlayer Film for Laminated Glass) The interlayer film has one end and the other end opposite the one end. The one end and the other end are opposite ends of the interlayer film.

[0202] The interlayer film may be an interlayer film having the same thickness at one end and the other end, or an interlayer film having a greater thickness at the other end than at the one end. The interlayer film may be an interlayer film having a uniform thickness or an interlayer film having a varying thickness. The cross-sectional shape of the interlayer film may be rectangular or wedge-shaped.

[0203] The maximum thickness of the interlayer is preferably 0.1 mm or more, more preferably 0.25 mm or more, even more preferably 0.5 mm or more, particularly preferably 0.8 mm or more, and is preferably 3.8 mm or less, more preferably 2.0 mm or less, and even more preferably 1.5 mm or less.

[0204] From the viewpoint of practical use and of sufficiently increasing adhesive strength and penetration resistance, the maximum thickness of the surface layer of the interlayer film is preferably 0.001 mm or more, more preferably 0.2 mm or more, and even more preferably 0.3 mm or more, and is preferably 1.0 mm or less, and more preferably 0.8 mm or less.

[0205] From the viewpoint of practical use and of sufficiently increasing 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, even more preferably 0.2 mm or more, and is preferably 0.8 mm or less, more preferably 0.6 mm or less, even more preferably 0.3 mm or less.

[0206] The distance between one end and the other end of the interlayer is preferably 3.0 m or less, more preferably 2.0 m or less, particularly preferably 1.5 m or less, and is preferably 0.5 m or more, more preferably 0.8 m or more, particularly preferably 1.0 m or more.

[0207] The interlayer film may have a shade area. The shade area may be separated from the display-corresponding area. The shade area is provided, for example, for the purpose of preventing the driver from feeling dazzled by sunlight or outdoor lighting while driving. The shade area may also be provided to provide heat insulation. The shade area is preferably located at the edge of the interlayer film. The shade area is preferably strip-shaped.

[0208] In the shade region, a colorant or filler may be used to change the color and visible light transmittance, etc. The colorant or filler may be contained in only a part of the region in the thickness direction of the interlayer film, or may be contained in the entire region in the thickness direction of the interlayer film.

[0209] From the viewpoint of improving the display and widening the field of view, the visible light transmittance of the display-corresponding region is preferably 80% or more, more preferably 88% or more, and even more preferably 90% or more. The visible light transmittance of the display-corresponding region is preferably higher than that of the shade region. The visible light transmittance of the display-corresponding region may be lower than that of the shade region. The visible light transmittance of the display-corresponding region is preferably 50% or more higher, more preferably 60% or more higher than that of the shade region.

[0210] For example, when the visible light transmittance varies in the interlayer film in the display corresponding area and the shade area, the visible light transmittance is measured at the center position of the display corresponding area and the center position of the shade area.

[0211] The visible light transmittance of the obtained laminated glass in the wavelength range of 380 nm to 780 nm can be measured using a spectrophotometer (for example, Hitachi High-Technologies Corporation's "U-4100") in accordance with JIS R3211: 1998. It is preferable to use clear glass with a thickness of 2 mm as the glass plate.

[0212] The interlayer film may be wound into a roll of the interlayer film. The roll may include a winding core and the interlayer film wound around the outer periphery of the winding core.

[0213] The method for producing the interlayer film is not particularly limited. In the case of a single-layer interlayer film, the method for producing the interlayer film includes extruding a resin composition using an extruder. In the case of a multi-layer interlayer film, the method for producing the interlayer film includes, for example, forming each layer using a resin composition for each layer, and then laminating the resulting layers. Furthermore, the method for producing the interlayer film includes co-extruding the resin compositions for each layer using an extruder to laminate the layers. A production method using extrusion molding is preferred because it is suitable for continuous production.

[0214] In view of excellent production efficiency of the interlayer film, it is preferable that the second layer and the third layer contain the same polyvinyl acetal resin. In view of excellent production efficiency of the interlayer film, it is more preferable that the second layer and the third layer contain the same polyvinyl acetal resin and the same plasticizer. In view of excellent production efficiency of the interlayer film, it is even more preferable that the second layer and the third layer are formed from the same resin composition.

[0215] The interlayer film preferably has an uneven shape on at least one of its two surfaces. The interlayer film more preferably has an uneven shape on both surfaces. The method for forming the uneven shape is not particularly limited, and examples thereof include lip embossing (melt fracture), embossing roll, calender roll, and profile extrusion.

[0216] (Laminated Glass) The laminated glass according to the present invention includes a first laminated glass member, a second laminated glass member, and the above-described interlayer film. In the laminated glass according to the present invention, the interlayer film is disposed between the first laminated glass member and the second laminated glass member.

[0217] FIG. 4 is a cross-sectional view that schematically shows an example of laminated glass that uses the interlayer film for laminated glass shown in FIG.

[0218] The laminated glass 31 shown in Fig. 4 includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11. The interlayer film 11 is disposed and sandwiched between the first laminated glass member 21 and the second laminated glass member 22.

[0219] A first laminated glass member 21 is laminated on a first surface of the interlayer film 11. A second laminated glass member 22 is laminated on a second surface opposite the first surface of the interlayer film 11. The first laminated glass member 21 is laminated on the outer surface of the second layer 2. The second laminated glass member 22 is laminated on the outer surface of the third layer 3.

[0220] FIG. 5 is a cross-sectional view that schematically shows an example of laminated glass that uses the interlayer film for laminated glass shown in FIG. 2 .

[0221] 5 includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11A. The interlayer film 11A is disposed and sandwiched between the first laminated glass member 21 and the second laminated glass member 22.

[0222] A first laminated glass member 21 is laminated on a first surface of the interlayer film 11A. A second laminated glass member 22 is laminated on a second surface of the interlayer film 11A opposite to the first surface.

[0223] The laminated glass may be a head-up display. When the laminated glass is a head-up display, the laminated glass has a display area for the head-up display. The display area is an area where information can be displayed well. For example, a laminated glass that is a head-up display can be obtained by using the interlayer film 11B shown in FIG. 3 , a first laminated glass member, and a second laminated glass member.

[0224] A head-up display system can be obtained using the head-up display. The head-up display system includes the laminated glass and a light source device for irradiating the laminated glass with light for image display. The light source device can be attached to the dashboard of a vehicle, for example. An image can be displayed by irradiating the display area of ​​the laminated glass with light from the light source device.

[0225] The first laminated glass member is preferably a first glass plate, and the second laminated glass member is preferably a second glass plate.

[0226] Examples of the first and second laminated glass members include glass plates and PET (polyethylene terephthalate) films. The laminated glass includes not only laminated glass in which an interlayer film is sandwiched between two glass plates, but also laminated glass in which an interlayer film is sandwiched between a glass plate and a PET film or the like. The laminated glass is a laminate including glass plates, and preferably includes at least one glass plate. It is preferable that the first laminated glass member and the second laminated glass member are each a glass plate or a PET film, and that the laminated glass includes a glass plate as at least one of the first laminated glass member and the second laminated glass member. It is particularly preferable that both the first and second laminated glass members are glass plates.

[0227] Examples of the glass plate include inorganic glass and organic glass. Examples of the inorganic glass include float glass, heat-absorbing glass, heat-reflecting glass, polished glass, patterned glass, lined glass, and green glass. The organic glass is a synthetic resin glass that replaces inorganic glass. Examples of the organic glass include polycarbonate plates and poly(meth)acrylic resin plates. Examples of the poly(meth)acrylic resin plates include polymethyl(meth)acrylate plates.

[0228] The thickness of each of the first laminated glass member and the second laminated glass member is preferably 1 mm or more and 5 mm or less, more preferably 3 mm or less. When the laminated glass member is a glass plate, the thickness of the glass plate is preferably 0.5 mm or more, more preferably 0.7 mm or more, and preferably 5 mm or less, more preferably 3 mm or less. When the laminated glass member is a PET film, the thickness of the PET film is preferably 0.03 mm or more and preferably 0.5 mm or less.

[0229] The method for producing the laminated glass is not particularly limited. First, an interlayer film is sandwiched between the first laminated glass member and the second laminated glass member to obtain a laminate. Next, the air remaining between the first laminated glass member, the second laminated glass member, and the interlayer film is removed, for example, by passing the obtained laminate through a pressure roll or placing it in a rubber bag and suctioning it under reduced pressure. Thereafter, a pre-bonded laminate is obtained by pre-bonding at approximately 70°C to 110°C. Next, the pre-bonded laminate is placed in an autoclave or pressed at approximately 120°C to 150°C and a pressure of 1 MPa to 1.5 MPa. In this manner, a laminated glass can be obtained.

[0230] The interlayer film and the laminated glass can be used in automobiles, railway vehicles, aircraft, ships, buildings, etc. The interlayer film and the laminated glass can also be used for applications other than these. The interlayer film and the laminated glass are preferably interlayer films and laminated glass for vehicles or buildings, and more preferably interlayer films and laminated glass for vehicles. The interlayer film and the laminated glass can be used for automobile windshields, side windows, rear windows, roof glass, backlight glass, etc. The interlayer film and the laminated glass are preferably used in automobiles. The interlayer film is preferably used to obtain laminated glass for automobiles.

[0231] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0232] The polyvinyl acetal resin used was acetalized using n-butylaldehyde having a carbon number of 4. The degree of acetalization (degree of butyralization), degree of acetylation, and hydroxyl group content of the polyvinyl acetal resin were measured by a method conforming to JIS K6728 "Testing Methods for Polyvinyl Butyral." Note that when measured by ASTM D1396-92, the values ​​shown were similar to those obtained by the method conforming to JIS K6728 "Testing Methods for Polyvinyl Butyral."

[0233] The following materials were prepared:

[0234] (Thermoplastic resin) Polyvinyl acetal resin (polyvinyl butyral resin, average degree of polymerization 1700, hydroxyl group content 30 mol%, acetylation degree 1 mol%, acetalization degree (butyralization degree) 69 mol%)

[0235] (First Plasticizer) Triethylene glycol di-2-ethylhexanoate (3GO)

[0236] (Second plasticizer) Trimethylolpropane (TMP) Polycaprolactone triol represented by the above formula (P) ("OD-X2586" manufactured by DIC Corporation; in the above formula (P1), n ​​is a number of 1 or more and 3 or less)

[0237] The solubility parameters (SP values) of the thermoplastic resin and each plasticizer are shown in Table 1. These solubility parameters (SP values) are values ​​calculated by the method described above.

[0238] (Colorant) Solvent Blue 36 (dye) Disperse Violet 28 (dye) Solvent Yellow 163 (dye)

[0239] (Ultraviolet absorber) Tinuvin 326 (2-(2'-hydroxy-3'-t-butyl-5-methylphenyl)-5-chlorobenzotriazole, "Tinuvin 326" manufactured by BASF)

[0240] (Antioxidant) BHT (2,6-di-t-butyl-p-cresol)

[0241] Example 1 Preparation of composition for forming first layer (colored layer): The following components were blended and thoroughly kneaded with a mixing roll to obtain a composition for forming the first layer (colored layer).

[0242] Polyvinyl butyral resin (PVB): 100 parts by weight Triethylene glycol di-2-ethylhexanoate (3GO): 30 parts by weight Polycaprolactone triol (DIC Corporation "OD-X2586"): 10 parts by weight Solvent Blue 36: Amount that will account for 0.29% by weight of the resulting first layer (100% by weight) Disperse Violet 28: Amount that will account for 0.27% by weight of the resulting first layer (100% by weight) Solvent Yellow 163: Amount that will account for 0.43% by weight of the resulting first layer (100% by weight) Tinuvin 326: Amount that will account for 0.2% by weight of the resulting first layer (100% by weight) BHT: Amount that will account for 0.2% by weight of the resulting first layer (100% by weight)

[0243] Preparation of composition for forming second layer and third layer (non-pigmented layer): The following components were blended and thoroughly kneaded with a mixing roll to obtain a composition for forming the second layer and third layer (non-pigmented layer).

[0244] Polyvinyl butyral resin (PVB): 100 parts by weight Triethylene glycol di-2-ethylhexanoate (3GO): 30 parts by weight Polycaprolactone triol (DIC Corporation "OD-X2586"): 10 parts by weight Tinuvin 326: an amount that will yield 0.2% by weight in 100% by weight of the second and third layers to be obtained BHT: an amount that will yield 0.2% by weight in 100% by weight of the second and third layers to be obtained

[0245] Preparation of interlayer film: The composition for forming the first layer and the compositions for forming the second and third layers were co-extruded using a co-extruder to prepare an interlayer film (thickness 800 μm) having a three-layer structure (second layer (thickness 350 μm) / first layer (thickness 100 μm) / third layer (thickness 350 μm)). The first, second, and third layers each correspond to the layer X described above.

[0246] Preparation of laminated glass: The obtained interlayer film was sandwiched between two 2 mm thick clear glass sheets (300 mm long x 300 mm wide) conforming to JIS R3202:1996 to obtain a laminate. The obtained laminate was placed in a rubber bag and degassed at a vacuum of 2.6 kPa for 20 minutes, then transferred to an oven in the degassed state and held at 90°C for 30 minutes to vacuum press the laminate to pre-pressure bond the laminate. The pre-pressure bonded laminate was then pressed in an autoclave at 135°C and a pressure of 1.2 MPa for 20 minutes to obtain laminated glass.

[0247] Examples 2 to 5 and Comparative Examples 1 to 5 Interlayer films (thickness 800 μm) having a three-layer structure (second layer (thickness 350 μm) / first layer (thickness 100 μm) / third layer (thickness 350 μm)) were prepared in the same manner as in Example 1, except that the type and content of the plasticizer were changed as shown in Tables 1 and 2. The types and blending amounts of the ultraviolet absorber, antioxidant, and colorant used were the same as in Example 1. Furthermore, laminated glass was prepared using the obtained interlayer films in the same manner as in Example 1.

[0248] (Evaluation) (1) Visible Light Transmittance of Each Layer of the Interlayer Film The visible light transmittance of the obtained laminated glass in the wavelength range of 380 nm to 780 nm was measured using a spectrophotometer ("U-4100" manufactured by Hitachi High-Technologies Corporation) to measure the visible light transmittance of each layer of the interlayer film.

[0249] (2) Color Transfer In each Example and Comparative Example, a composition having the same composition as the composition for forming the first layer (colored layer) described above except for the concentration of the colorant was thoroughly mixed with a mixing roll to form a colored layer (760 μm thick) for color transfer testing. The concentration of the colorant was adjusted appropriately so that the visible light transmittance of the first layer (100 μm thick) measured in (1) above was the same as the visible light transmittance of the resulting colored layer (760 μm thick) for color transfer testing. Specifically, Solvent Blue 36 was used in an amount of 0.04 wt%, Disperse Violet 28 in an amount of 0.03 wt%, and Solvent Yellow 163 in an amount of 0.05 wt% based on 100 wt% of the resulting colored layer for color transfer testing. In each example and comparative example, a composition having the same composition as the composition for forming the second and third layers (non-pigmented layers) was thoroughly mixed with a mixing roll to form a non-pigmented layer (thickness: 760 μm) for color transfer testing. The visible light transmittance of the non-pigmented layer (thickness: 760 μm) for color transfer testing is shown in the table.

[0250] Two non-colored layers for color transfer test were prepared, and the following test was carried out on one of them. The two non-colored layers for color transfer test are referred to as non-colored layers for color transfer test (1) and (2), respectively.

[0251] A colored layer for color transfer testing (4 cm long, 4 cm wide, 760 μm thick) was placed on a rubber sheet (hardness 60, 5 cm long, 5 cm wide, 3 mm thick, "B-1001" manufactured by Irumagawa Rubber Co., Ltd.) Next, a non-colored layer for color transfer testing (1) (4 cm long, 4 cm wide, 760 μm thick) was placed on the colored layer for color transfer testing.

[0252] Next, a clear glass (3 cm long, 3 cm wide, 2.5 mm thick) was placed on the non-colored layer (1) for color transfer test. Next, a laminated glass for weight (15 cm long, 15 cm wide, 5.8 mm thick) was placed on the clear glass, and a weight was placed on the laminated glass for weight. The total weight of the laminated glass for weight and the weight was 1800 g. In this state, the test was left for one week under conditions of 23°C and 25% humidity. After leaving the test, the non-colored layer (1) for color transfer test was removed.

[0253] A laminated glass was produced using an uncolored layer (1) for color transfer testing after standing and two pieces of clear glass (2.5 mm thick, 4 cm long, 4 cm wide) having a visible light transmittance of 90% measured in accordance with JIS R3106:1998. A laminated glass was also produced using an untested uncolored layer (2) for color transfer testing and two pieces of clear glass (2.5 mm thick, 4 cm long, 4 cm wide) having a visible light transmittance of 90% measured in accordance with JIS R3106:1998. The color change (color difference ΔE) of these laminated glasses before and after standing was measured using a spectrophotometer (Hitachi High-Technologies Corporation's "U-4100") in accordance with JIS Z 8781-4:2013. More specifically, the transmittance of the laminated glass in the wavelength range of 380 nm to 780 nm is measured, and the color coordinates a are calculated using the CIE standard illuminant D65 and a 10° visual color matching function specified in JIS Z8781. ＊ , color coordinate b ＊ and color coordinate L ＊ The color difference ΔE was determined by measuring the color difference ΔE. The measurement position was the center of the laminated glass. The color transfer was evaluated according to the following criteria.

[0254] [Color transfer evaluation criteria] ◯: ΔE is 6 or less ○: ΔE is more than 6 and less than 8 ×: ΔE is more than 8

[0255] (3) Glass Transition Temperature (Tg) of Each Layer of the Interlayer Film Each layer was peeled from the interlayer film, and each isolated layer was press-molded using a press molding machine to form a measurement object (layer). Measurements were carried out using an "ARES-G2" manufactured by TAINSTRUMENTS. Parallel plates with a diameter of 8 mm were used as the jig, and measurements were carried out under conditions of decreasing the temperature from 100°C to -10°C at a rate of 3°C / min, at a frequency of 1 Hz, and at a strain of 1%. The peak temperature of the loss tangent in the measurement results obtained was taken as the glass transition temperature Tg (°C).

[0256] [Criteria for determining the glass transition temperature of each layer of the interlayer film] ○: Glass transition temperature is 29°C or less ×: Glass transition temperature is higher than 29°C

[0257] The composition of the interlayer and the results are shown in Tables 1 and 2 below.

[0258]

[0259]

[0260] DESCRIPTION OF SYMBOLS 1, 1B... First layer 1a... First surface 1b... Second surface 2, 2B... Second layer 3, 3B... Third layer 11, 11A, 11B... Interlayer film 11a... One end 11b... Other end 21... First laminated glass member 22... Second laminated glass member 31, 31A... Laminated glass R1... Display-corresponding region R2... Surrounding region R3... Shade region

Claims

1. Thermoplastic resin and a solubility parameter of 18.0 (J / cm²) ３ ) ０．５ The first plasticizer has a solubility parameter of less than 18.0 (J / cm²). ３ ) ０．５ An interfilm for laminated glass comprising the above-mentioned second plasticizer.

2. The interfilm for laminated glass according to claim 1, comprising a layer X containing the first plasticizer and the second plasticizer.

3. A layer X comprising the first plasticizer and the second plasticizer, The interlayer film for laminated glass according to claim 1, wherein the second plasticizer is trimethylolpropane, triethylene glycol, 3-(2-ethylhexyloxy)-1,2-propanediol, polycaprolactone triol represented by the following formula (P), 1,4-butanediol, diethylene glycol, dipropylene glycol, triethylene glycol monomethyl ether, or triethylene glycol dimethyl ether. 【Chemistry 1】 In the above formula (P), R1 to R3 each represent a group represented by the following formula (P1). 【Chemistry 2】 In the above formula (P1), n ​​represents a number between 1 and 5, and * represents the bonding position with the oxygen atom.

4. The interlayer film for laminated glass according to claim 3, wherein the second plasticizer is trimethylolpropane, triethylene glycol, 3-(2-ethylhexyloxy)-1,2-propanediol, or polycaprolactone triol represented by formula (P).

5. The solubility parameter of the first plasticizer is 15.0 (J / cm²). ３ ) ０．５ That's all. The solubility parameter of the second plasticizer is 18.5 (J / cm ３ ). ０．５ or more and 30.0 (J / cm ３ ). ０．５ The interlayer film for laminated glass according to any one of claims 1 to 4, wherein the interlayer film is as described above.

6. The absolute value of the difference between the solubility parameter of the second plasticizer and the solubility parameter of the first plasticizer is 0.5 (J / cm²). ３ ) ０．５ The above is the interfilm for laminated glass according to any one of claims 1 to 4.

7. The interfilm for laminated glass according to any one of claims 1 to 4, wherein the first plasticizer is triethylene glycol di-2-ethylhexanoate, triethylene glycol di-2-ethyl butyrate, or triethylene glycol di-n-butanoate.

8. The interlayer film for laminated glass according to claim 1, wherein the second plasticizer is trimethylolpropane, triethylene glycol, 3-(2-ethylhexyloxy)-1,2-propanediol, or polycaprolactone triol represented by the following formula (P). 【Transformation 3】 In the above formula (P), R １ ~R ３ Each of these represents a group expressed by the following formula (P1). 【Chemistry 4】 In the above formula (P1), n ​​represents a number between 1 and 5, and * represents the bonding position with the oxygen atom.

9. The interlayer film for laminated glass according to claim 1, wherein the second plasticizer is trimethylolpropane, 3-(2-ethylhexyloxy)-1,2-propanediol, polycaprolactone triol represented by the following formula (P), 1,4-butanediol, diethylene glycol, dipropylene glycol, triethylene glycol monomethyl ether, or triethylene glycol dimethyl ether. 【Transformation 5】 In the above formula (P), R1 to R3 each represent a group represented by the following formula (P1). 【Transformation 6】 In the above formula (P1), n ​​represents a number between 1 and 5, and * represents the bonding position with the oxygen atom.

10. The interlayer film for laminated glass according to claim 9, wherein the second plasticizer is trimethylolpropane, 3-(2-ethylhexyloxy)-1,2-propanediol, or polycaprolactone triol represented by formula (P).

11. The material comprises a layer X containing the first plasticizer and the second plasticizer, An interlayer film for laminated glass according to any one of claims 1 to 4 and 8 to 10, wherein the content of the second plasticizer in 100% by weight of the plasticizer contained in the layer X is 20% by weight or more and 80% by weight or less.

12. The material comprises a layer X containing the first plasticizer and the second plasticizer, The layer X includes the thermoplastic resin, The absolute value of the difference between the solubility parameter of the thermoplastic resin contained in layer X and the solubility parameter of the second plasticizer contained in layer X is 9.0 (J / cm²). ３ ) ０．５ The following is an interfilm for laminated glass according to any one of claims 1 to 4 and 8 to 10.

13. An interlayer for laminated glass according to any one of claims 1 to 4 and 8 to 10, comprising a coloring agent.

14. The interfilm for laminated glass according to claim 13, wherein the coloring agent is a dye.

15. The first laminated glass member, A second laminated glass component, The interlayer for laminated glass according to any one of claims 1 to 4 and 8 to 10, A laminated glass in which the interlayer film for laminated glass is disposed between the first laminated glass member and the second laminated glass member.

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