Interlayer film for laminated glass, laminated glass, and method for producing interlayer film for laminated glass

Abstract

An intermediate film (1) for laminated glass according to the present invention is provided with a functional film (10) and one or more first polymer sheets (20a, 20b) that are provided on one surface (11) of the functional film (10), and that are provided with a plurality of first polymer sheets (20a, 20b) that are provided on the other surface (11) of the functional film (10) in a projection view in the thickness direction, said first polymer sheets (20a, 20b) being provided on the other surface (11) of the functional film (10). The functional film (10) is included in at least a region of the first polymer sheet (20a) that is in contact with the functional film among the one or more first polymer sheets (20a, 20b), and the interlayer film (1) for laminated glass is further provided with one or more gap-filling polymer sheets (30). And one or more gap-filling polymer sheets (30) provided on the opposite side of the first polymer sheets (20a, 20b) from the functional film side. This laminated glass is provided with a pair of glass plates and the interlayer film (1) for laminated glass, said interlayer film (1) being provided between the pair of glass plates. According to the present invention, it is possible to provide an intermediate film for laminated glass, laminated glass, and a method for manufacturing the intermediate film for laminated glass, the intermediate film for laminated glass being capable of suppressing the occurrence of height differences in the thickness direction, and being capable of reducing gaps occurring at the end of a functional film.

Description

Technical Field

[0001] This invention relates to an interlayer for laminated glass, laminated glass, and a method for manufacturing an interlayer for laminated glass. Background Technology

[0002] Previously, laminated glass was known to be made by sandwiching an interlayer between two panes of glass. The interlayer is mostly formed from plasticized polyvinyl acetal, which contains plasticizers in polyvinyl acetal resin. Even if laminated glass is broken by external impact, the glass fragments are less likely to scatter, making it safe. Therefore, it is widely used for windows in automobiles, airplanes, buildings, and other vehicles.

[0003] Laminated glass is typically manufactured as follows: an interlayer is placed between two glass sheets. After a pre-degassing process, the glass is heated and pressurized in an autoclave (ACV) process at a temperature of approximately 130-140°C and a pressure of approximately 1.3 MPa to bond the glass and the interlayer together.

[0004] In recent years, there has been a demand for various functions to laminated glass, such as the placement of functional films like dimming elements between two glass plates. It is known that when assembling functional films like dimming elements into laminated glass, two films are prepared, and a functional film is sandwiched between the two films and integrated into a single film, which is then used as an interlayer.

[0005] Furthermore, as the intermediate layer constituting the intermediate film, an intermediate layer with an opening and an intermediate layer without an opening are prepared. Moreover, it is known to stack a glass plate and an intermediate layer in such a way as a glass plate / an intermediate layer without an opening / an intermediate layer in which a functional film is disposed inside the opening / an intermediate layer without an opening / a glass plate, thereby integrating the glass plate, the intermediate film and the functional film (for example, see Patent Document 1).

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Publication No. 2009-534283 Summary of the Invention

[0009] The problem the invention aims to solve

[0010] Intermediate films obtained by sandwiching functional films between two films usually have functional films that are smaller than the individual films. As a result, there is a height difference between the parts where functional films are placed and the parts where functional films are not placed, leading to uneven thickness.

[0011] On the other hand, if an intermediate layer with an opening is used as in Patent Document 1, the height difference of the intermediate film between the regions where the functional film exists and the regions where the functional film does not exist can be suppressed, and the overall thickness of the intermediate film can be made uniform.

[0012] However, if the glass plate, intermediate film and functional film are heated and pressed together using an autoclave or similar device, the position of the intermediate layer with the opening may shift or the size may change, and sometimes voids may be generated at the ends of the functional film.

[0013] Therefore, another objective of the present invention is to provide an interlayer for laminated glass, laminated glass, and a method for manufacturing the interlayer for laminated glass, wherein the interlayer for laminated glass is capable of suppressing the generation of height differences in the thickness direction and reducing voids generated at the ends of the functional film.

[0014] Solution for solving the problem

[0015] The inventors conducted in-depth research and found that by studying the configuration of a gap-filling polymer sheet that suppresses the occurrence of the height difference of the intermediate film between the region where the functional film exists and the region where the functional film does not exist, the above-mentioned problem can be solved, and thus the following invention was completed. That is, the present invention provides the following [1] to

[18] .

[0016] [1] An interlayer for laminated glass, comprising a functional film and one or more first polymer sheets, wherein the one or more first polymer sheets are disposed on one side of the functional film.

[0017] In a projection view along the thickness direction, the functional film is included in at least the region of the first polymer sheet that is in contact with the functional film among the one or more first polymer sheets.

[0018] The interlayer film for laminated glass also includes one or more gap-filling polymer sheets, which are disposed on the side of the first polymer sheet opposite to the side of the functional film.

[0019] [2] According to the interlayer film for laminated glass described in [1] above, wherein the surface roughness (R) of the side of the polymer sheet used for gap filling is... zjis94 The size is greater than 1 μm and less than 100 μm.

[0020] [3] The interlayer film for laminated glass described in [1] or [2] above further comprises a second polymer sheet disposed on the other side of the functional film.

[0021] [4] According to the interlayer film for laminated glass described in [3] above, wherein the surface roughness (R) of the side of the second polymer sheet is... zjis94 The size is greater than 1 μm and less than 100 μm.

[0022] [5] According to the interlayer film for laminated glass described in [3] or [4] above, in a projection view in the thickness direction, the distance between the outer periphery of the first polymer sheet and the outer periphery of the gap-filling polymer sheet is 0 mm or more and 10 mm or less.

[0023] In the thickness-direction projection view, the distance between the outer periphery of the second polymer sheet and the outer periphery of the gap-filling polymer sheet is 0 mm or more and 10 mm or less.

[0024] In the thickness direction of the projection view, the distance between the outer periphery of the first polymer sheet and the outer periphery of the second polymer sheet is greater than 0 mm and less than 10 mm.

[0025] [6] The interlayer film for laminated glass according to any one of [1] to [5] above, wherein the polymer sheet for filling the gap has an opening in the region overlapping with the functional film in a projection view in the thickness direction.

[0026] [7] According to the interlayer film for laminated glass described in [6] above, the polymer sheet for filling the gap having the opening is composed of a plurality of polymer sheets arranged in a planar direction.

[0027] [8] According to the interlayer film for laminated glass described in [6] or [7] above, in a projection view in the thickness direction, the distance between the inner periphery of the opening of the gap-filling polymer sheet and the outer periphery of the functional film is less than 5 mm throughout the circumference.

[0028] [9] The interlayer film for laminated glass according to any one of [1] to [8] above, wherein at least one of the first polymer sheet and the gap-filling polymer sheet contains at least one thermoplastic resin selected from the group consisting of polyvinyl acetal resin and ethylene-vinyl acetate copolymer resin.

[0029]

[10] The interlayer film for laminated glass according to any one of [1] to [9] above, wherein the functional film is a film that has the function of absorbing or reflecting specific light.

[0030]

[11] The interlayer film for laminated glass according to any one of [1] to

[10] above, wherein the functional film comprises polyethylene terephthalate resin.

[0031]

[12] The interlayer film for laminated glass according to any one of [1] to

[11] above, wherein the functional film is a P-polarized light reflective film, a holographic film, a thermal ray reflective film, a dimming film, a display element film, a transparent conductive film, a touch sensor film, a circuit film, a solar power generation film, or a film capable of electrical control.

[0032]

[13] The interlayer film for laminated glass according to any one of [3] to [5] above, wherein the second polymer sheet contains at least one thermoplastic resin selected from the group consisting of polyvinyl acetal resin and ethylene-vinyl acetate copolymer resin.

[0033]

[14] The interlayer film for laminated glass according to any one of [1] to

[13] above further comprises a third polymer sheet disposed on the side of the gap-filling polymer sheet opposite to the side of the first polymer sheet.

[0034]

[15] The interlayer film for laminated glass according to any one of [3] to [5] above, wherein the side of the gap-filling polymer sheet and the side of the second polymer sheet have irregular or random undulations.

[0035]

[16] The interlayer film for laminated glass according to any one of [3] to [5] above, wherein at least one of the polymer sheet side of the gap filling and the second polymer sheet side is protected by a release film.

[0036]

[17] The method for manufacturing the interlayer film for laminated glass according to any one of [1] to

[16] above includes a step of stacking the functional film, the first polymer sheet and the gap-filling polymer sheet in such a way that the functional film, the first polymer sheet and the gap-filling polymer sheet are arranged in the order of the functional film, the first polymer sheet and the gap-filling polymer sheet.

[0037]

[18] A laminated glass comprising: a pair of glass plates and an interlayer for laminated glass disposed between the pair of glass plates as described in any one of [1] to

[16] above.

[0038] The effects of the invention

[0039] According to the present invention, an interlayer film for laminated glass and laminated glass, as well as a method for manufacturing the interlayer film for laminated glass, are provided, wherein the interlayer film for laminated glass can suppress the generation of height differences in the thickness direction and can reduce the gap generated at the ends of the functional film. Attached Figure Description

[0040] Figure 1 (a) is a top view of the interlayer film for laminated glass according to the first embodiment of the present invention. Figure 1(b) is Figure 1 (a) AA section view, Figure 1 (c) is an exploded view of the interlayer film for laminated glass according to the first embodiment of the present invention.

[0041] Figure 2 This is a cross-sectional view of a modified example of the interlayer film for laminated glass according to the first embodiment of the present invention.

[0042] Figure 3 (a) is a top view of the interlayer film for laminated glass according to the second embodiment of the present invention. Figure 3 (b) is Figure 3 (a) AA section view, Figure 3 (c) is an exploded view of the interlayer film for laminated glass according to the second embodiment of the present invention.

[0043] Figure 4 This is a cross-sectional view of a modified example of the interlayer film for laminated glass according to the second embodiment of the present invention.

[0044] Figure 5 This is an exploded view of the interlayer film for laminated glass according to the third embodiment of the present invention.

[0045] Figure 6 This is a cross-sectional view of a modified example of the interlayer film for laminated glass according to the third embodiment of the present invention.

[0046] Figure 7 This is an exploded view of the interlayer film for laminated glass according to the fourth embodiment of the present invention.

[0047] Figure 8 This is a cross-sectional view of a modified example of the interlayer film for laminated glass according to the fourth embodiment of the present invention.

[0048] Figure 9 This is a cross-sectional view of the interlayer film for laminated glass according to the fifth embodiment of the present invention.

[0049] Figure 10 This is a cross-sectional view of a modified example of the interlayer film for laminated glass according to the fifth embodiment of the present invention.

[0050] Figure 11 This is a cross-sectional view of a laminated glass, illustrating an example of the layer composition of the laminated glass of the present invention.

[0051] Figure 12 This is a cross-sectional view of a laminated glass, illustrating an example of the layer composition of the laminated glass of the present invention.

[0052] Figure 13 This is a graph used to illustrate the measurement of the thickness of the interlayer film for laminated glass in the embodiments.

[0053] Figure 14(a) is a diagram illustrating the composition of the interlayer film for laminated glass in Examples 1, 2, 4 and 5. Figure 14 (b) is a diagram illustrating the structure of the interlayer film for laminated glass in Example 3. Figure 14 (c) is a diagram illustrating the structure of the interlayer film for laminated glass in Example 6. Figure 14 (d) is a diagram used to illustrate the composition of the interlayer film for the laminated glass in Comparative Example 1. Figure 14 (e) is a diagram used to illustrate the structure of the interlayer film for the laminated glass in Comparative Example 2.

[0054] Figure 15 (a) is a diagram illustrating the polymer sheet used to fill the gaps in the interlayer film of laminated glass in Examples 1 and 3 and Comparative Example 2. Figure 15 (b) is a diagram illustrating the polymer sheet used to fill the gap in the interlayer film of the laminated glass in Example 2.

[0055] Figure 16 (a) is a top view of the interlayer film for laminated glass according to the sixth embodiment of the present invention. Figure 16 (b) is Figure 16 (a) AA section view, Figure 16 (c) is an exploded view of the interlayer film for laminated glass according to the sixth embodiment of the present invention.

[0056] Figure 17 (a) is a top view of the interlayer film for laminated glass according to the seventh embodiment of the present invention. Figure 17 (b) is Figure 17 (a) AA section view, Figure 17 (c) is an exploded view of the interlayer film for laminated glass according to the seventh embodiment of the present invention. Detailed Implementation

[0057] [Intermediate film for laminated glass according to the first embodiment]

[0058] Reference Figure 1 The interlayer for laminated glass according to the first embodiment of the present invention will be described.

[0059] The interlayer film 1 for laminated glass according to the first embodiment of the present invention includes a functional film 10 and one or more first polymer sheets 20a and 20b disposed on one side of the functional film 10. In a projection view in the thickness direction, the functional film 10 includes at least a region of the first polymer sheet 20a that is in contact with the functional film 10 among the one or more first polymer sheets 20a and 20b. In addition, in this embodiment, the interlayer film 1 for laminated glass also includes one or more gap-filling polymer sheets 30, which are disposed on the side of the first polymer sheets 20a and 20b opposite to the functional film side.

[0060] It should be noted that the functional film 10 being included in the region of the first polymer sheet 20a means that, in a projection view in the thickness direction, the functional film 10 is entirely contained within the region of the first polymer sheet 20a. Furthermore, in a projection view in the thickness direction, at least a portion of the outer periphery of the functional film 10 exists inside the outer periphery of the first polymer sheet 20a; preferably, the entire outer periphery of the functional film 10 exists inside the outer periphery of the first polymer sheet 20a.

[0061] Based on the above structure, the gap generated at the end 12 of the functional film 10 can be reduced by following the height difference of the first polymer sheets 20a and 20b. In addition, the gap-filling polymer sheet 30 can be used to fill the thickness difference between the area where the functional film 10 is present and the area where the functional film 10 is not present, which is caused by the setting of the functional film 10, thereby suppressing the generation of the height difference in the thickness direction of the interlayer film for laminated glass.

[0062] It should be noted that, in Figure 1 In the interlayer film 1 for laminated glass shown, the number of first polymer sheets 20a and 20b disposed on one side 11 of the functional film 10 is two, but it can also be one, or even three or more. Multiple first polymer sheets 20a and 20b can be disposed as follows... Figure 1 The layers are stacked in the thickness direction as shown. Furthermore, in the interlayer film 1 for laminated glass, the first polymer sheets 20a and 20b and the gap-filling polymer sheet 30 are bonded to each other, and the functional film 10 is also bonded to the first polymer sheet 20a. The bonding of these polymer sheets and the functional film, as described later, can be achieved by heat pressing.

[0063] The surface roughness (R) of the polymer sheet side surface 2 used for filling the gaps in the interlayer film 1 of the laminated glass according to the first embodiment of the present invention is... zjis94The surface roughness (R) is preferably 1 μm or more and 100 μm or less. In the interlayer film 1 for laminated glass of the first embodiment of the present invention, the surface 2 of the polymer sheet side for filling the gap is a surface constituting one surface of the interlayer film 1 for laminated glass, and becomes the surface in contact with the glass plate when bonded to the glass plate. In the interlayer film 1 for laminated glass of the first embodiment of the present invention, if the surface roughness (R) of the surface 2 of the polymer sheet side for filling the gap is... zjis94 If the surface roughness (R) of the interlayer film 1 is between 1 μm and 100 μm, then air residue can be suppressed when the laminated glass is pressed onto the glass plate. From this perspective, the surface roughness (R) of the polymer sheet side 2 used to fill the gaps in the interlayer film 1 of the laminated glass is also considered. zjis94 More preferably, the micrometer is 3μm or more and 80μm or less; even more preferably, it is 5μm or more and 70μm or less; and even more preferably, it is 25μm or more and 50μm or less.

[0064] It should be noted that surface roughness (R) zjis94 The surface roughness (R) is a ten-point average roughness measured according to JIS B 601-1994. It is used to determine the surface roughness (R) mentioned above. zjis94 The measuring instrument for surface roughness (R) can be, for example, the "Surfcorder SE500A" manufactured by Kosaka Labs. More specifically, the aforementioned surface roughness (R) zjis94 A stethoscope with a front radius of 2 μm and a front angle of 90° can be used. The measurement is conducted at 23°C and 30% RH under the following conditions: a cutoff value of 2.5 mm, a reference length of 2.5 mm, a measurement length of 12.5 mm, a preparatory length of 2.5 mm, and a stethoscope feed speed of 0.5 mm / s. When the surface of the interlayer film 1 for laminated glass is embossed with grooves, the ten-point average roughness (Rz) is measured by feeding the stethoscope in a direction perpendicular to the groove direction. Additionally, the surface roughness (R...) zjis94 The surface roughness (R0) can be determined by measuring 10 points at equal intervals from one end to the other and calculating their average value. In this case, the surface roughness (R0) of the polymer sheet side surface 2 used to fill the gap in the interlayer film 1 of the laminated glass is determined. zjis94 The measurements can be performed on both the first polymer sheet 20b and the gap-filling polymer sheet 30.

[0065] For example, by forming an uneven shape on the polymer sheet side surface 2 of the interlayer film 1 used in laminated glass to fill the gaps, the surface roughness (R) of the polymer sheet side surface 2 of the interlayer film 1 used in laminated glass can be adjusted. zjis94The thickness is 1 μm or more and 100 μm or less. There are no particular limitations on the method for forming the uneven shape; for example, lip embossing, embossing roller method, and calendering roller method can be listed. It should be noted that the surface 2 of the polymer sheet side for filling the gaps in the interlayer film 1 of laminated glass can have a regular shape or an irregular shape.

[0066] In a thickness-direction projection view, the outer periphery of the gap-filling polymer sheet 30 may be located outside, inside, or at the same position as the outer periphery of each of the first polymer sheets 20a and 20b. That is, in a thickness-direction projection view, the outer periphery of the gap-filling polymer sheet 30 may be positioned at the same position as the outer periphery of each of the first polymer sheets 20a and 20b, or it may be positioned outside, or it may be positioned inside. However, the outer periphery of the opening 31 of the gap-filling polymer sheet 30 is preferably positioned at the same or approximately the same position as the outer periphery of the functional film 10.

[0067] In a projection view along the thickness direction, the outer periphery of the gap-filling polymer sheet 30 can be larger than, smaller than, or the same as the outer periphery of each of the first polymer sheets 20a and 20b. It should be noted that "larger than the outer periphery" means that, in the projection view, the outer periphery of the gap-filling polymer sheet 30 is generally located on the outer side compared to the outer periphery of each of the first polymer sheets 20a and 20b. "Smaller than the outer periphery" means that, in the projection view, the outer periphery of the gap-filling polymer sheet 30 is generally located on the inner side compared to the outer periphery of each of the first polymer sheets 20a and 20b. "The same as" means that, in the projection view, the outer periphery of the gap-filling polymer sheet 30 is the same as the outer periphery of each of the first polymer sheets 20a and 20b.

[0068] Furthermore, in the thickness direction projection view, the distance (W2) between the outer periphery of each of the first polymer sheets 20a and 20b and the outer periphery of the gap-filling polymer sheet 30 is preferably 0 mm or more and 10 mm or less throughout the entire circumference. If, in the thickness direction projection view, the distance (W2) between the outer periphery of each of the first polymer sheets 20a and 20b and the outer periphery of the gap-filling polymer sheet 30 is 0 mm or more and 10 mm or less, then when the interlayer film 1 for laminated glass is provided between the two glass plates, it is easier to maintain a constant thickness of the interlayer film 1 for laminated glass. From this viewpoint, in the thickness direction projection view, the distance (W2) between the outer periphery of each of the first polymer sheets 20a and 20b and the outer periphery of the gap-filling polymer sheet 30 is preferably 0 mm or more and 5 mm or less throughout the entire circumference, more preferably 0 mm or more and 3 mm or less, and even more preferably 0 mm or more and 1 mm or less. Figure 2As shown, it is preferable that the outer peripheries 22a, 22b of each of the first polymer sheets 20a, 20b are the same size as the outer periphery 32 of the gap-filling polymer sheet 30A. In particular, it is preferred that, in the projection view in the thickness direction, the outer periphery 32 of the gap-filling polymer sheet 30 and the outer peripheries 22a, 22b of the first polymer sheets 20a, 20b are arranged at the same position as each other.

[0069] In addition, such as Figure 1 As shown, it is also preferable that, in a projection view in the thickness direction, the outer periphery of the gap-filling polymer sheet 30 is located entirely inside the outer periphery of the first polymer sheets 20a and 20b. If the outer periphery of the gap-filling polymer sheet 30 is located inside the outer periphery of the first polymer sheets 20a and 20b, then as... Figure 1 As shown, a height difference is generated in the thickness direction. However, most of this height difference is pre-filled by the polymer sheet 30 for gap filling. In addition, since it is a height difference of the outermost surface of the interlayer film 1, it is largely filled by the deformation of the interlayer film 1 during the pressing with the glass. Therefore, even if a height difference exists, it is difficult for defects such as gaps to occur between the glass plate and the interlayer film.

[0070] The gap-filling polymer sheet 30 preferably has an opening 31 in the region overlapping with the functional film 10 in a projection view in the thickness direction. This makes it easier to suppress the occurrence of height differences in the thickness direction caused by the interlayer film 1 for laminated glass containing the functional film 10.

[0071] In a projection view along the thickness direction, the shape of the opening 31 of the gap-filling polymer sheet 30 is preferably similar to the shape of the functional film 10. This allows for a further reduction in the gaps generated at the ends 12 of the functional film 10.

[0072] In the thickness direction projection view, the inner periphery of the opening 31 of the gap-filling polymer sheet 30 and the outer periphery of the functional film 10 are preferably disposed at the same position or approximately at the same position. It should be noted that, in the thickness direction projection view, the inner periphery of the opening 31 of the gap-filling polymer sheet 30 can be larger than, smaller than, or the same as the outer periphery of the functional film 10. Specifically, in the thickness direction projection view, it is preferable that the distance (W1) between the inner periphery of the opening 31 of the gap-filling polymer sheet 30 and the outer periphery of the functional film 10 is 5 mm or less throughout the entire circumference. If, in the thickness direction projection view, the distance (W1) between the inner periphery of the opening 31 of the gap-filling polymer sheet 30 and the outer periphery of the functional film 10 is 5 mm or less, the gap generated at the end 12 of the functional film 10 can be further reduced. From this perspective, in a projection view along the thickness direction, the distance (W1) between the inner periphery of the opening 31 of the gap-filling polymer sheet 30 and the outer periphery of the functional film 10 is more preferably 3 mm or less, and even more preferably 1 mm or less, throughout the entire circumference. The lower limit of the distance (W1) is not particularly limited; the smaller the better, and 0 mm or more is acceptable.

[0073] Furthermore, in the thickness direction projection view, the outer periphery of the functional film 10 is more preferably disposed at the same position as the inner periphery of the opening 31 or at a position further inward than the inner periphery of the opening 31. The outer periphery of the functional film 10 is further preferably disposed at any position between the same position as the inner periphery of the opening 31 and a position further inward than the inner periphery of the opening 31.

[0074] exist Figure 1 In the middle, the gap-filling polymer sheet 30 is composed of a single polymer sheet, or it can be composed of two or more polymer sheets stacked together.

[0075] The first polymer sheets 20a and 20b and the gap-filling polymer sheet 30 each contain resin. The resin used in the first polymer sheets 20a and 20b and the gap-filling polymer sheet 30 can be a curable resin such as a thermosetting resin or a moisture-curing resin, and a thermoplastic resin is preferred. By using a thermoplastic resin, the first polymer sheets 20a and 20b and the gap-filling polymer sheet 30 can be easily bonded together by heat pressing.

[0076] The thermoplastic resins used in the first polymer sheets 20a, 20b and the gap-filling polymer sheet 30 include, for example, (meth)acrylic resins, polyvinyl acetal resins, polyvinyl alcohol (PVA) resins, polyurethane (PU) resins, ethylene-vinyl acetate copolymer resins (EVA), ethylene-vinyl acetate copolymer saponification (EVOH), ethylene-methacrylic acid copolymer resins, ionomer resins, isobutylene resins, styrene-isoprene copolymer resins, and styrene-butadiene copolymer resins.

[0077] Among the above, the thermoplastic resins are preferably polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, and (meth)acrylic resin, more preferably polyvinyl acetal resin and ethylene-vinyl acetate copolymer resin, and even more preferably polyvinyl acetal resin. By using polyvinyl acetal resin, the laminated glass readily exhibits excellent impact resistance and good adhesion to the glass sheet.

[0078] At least one of the first polymer sheets 20a and 20b and the gap-filling polymer sheet 30 preferably comprises at least one thermoplastic resin selected from the group consisting of polyvinyl acetal resin and ethylene-vinyl acetate copolymer resin. This further improves the impact resistance of the laminated glass.

[0079] The first polymer sheets 20a and 20b and the gap-filling polymer sheet 30 preferably use the same type of resin. Using the same resin facilitates heat bonding between them. Therefore, the resins used in the first polymer sheets 20a and 20b and the gap-filling polymer sheet 30 are preferably all polyvinyl acetal resins. Furthermore, the resins used in the first polymer sheets 20a and 20b and the gap-filling polymer sheet 30 are also preferably all ethylene-vinyl acetate copolymer resins.

[0080] (Polyvinyl acetal resin)

[0081] The following describes in detail the polyvinyl acetal resin used in the first polymer sheets 20a, 20b and the gap-filling polymer sheet 30.

[0082] There are no particular limitations on polyvinyl alcohol acetal resin as long as it is obtained by acetalizing polyvinyl alcohol with aldehyde.

[0083] The average degree of polymerization of PVA is preferably 200 or more, more preferably 500 or more, even more preferably 1000 or more, and still more preferably 1500 or more. If the average degree of polymerization is at or above the aforementioned lower limit, the penetration resistance of the laminated glass is increased. Furthermore, the average degree of polymerization of PVA is preferably 5000 or less, more preferably 4000 or less, and even more preferably 3500 or less. If the average degree of polymerization is at or below the aforementioned upper limit, the forming of the interlayer for laminated glass becomes easier.

[0084] It should be noted that the average degree of polymerization of polyvinyl alcohol was determined according to the method in JIS K 6726 "Test Method for Polyvinyl Alcohol".

[0085] The aldehydes mentioned above are not particularly limited, but aldehydes with 1 to 10 carbon atoms are generally suitable. Examples of aldehydes with 1 to 10 carbon atoms include n-butyraldehyde, isobutyraldehyde, n-pentanaldehyde, 2-ethylbutyraldehyde, n-hexanaldehyde, n-octanaldehyde, n-nonanaldehyde, n-decanaldehyde, formaldehyde, acetaldehyde, and benzaldehyde. These aldehydes can be used alone or in combination of two or more.

[0086] The number of carbon atoms in the acetal group contained in the polyvinyl acetal resin is not particularly limited, but is preferably 1 to 10, more preferably 3 to 5, further preferably 4 or 5, and particularly preferably 4. Furthermore, as a specific aldehyde, n-butyraldehyde, n-hexanaldehyde, and n-pentanaldehyde are preferred, with n-butyraldehyde being more preferred. Therefore, polyvinyl acetal resin is preferably polyvinyl butyral resin, and polyvinyl acetal resins (1) and (2) are preferably both polyvinyl butyral resins.

[0087] Polyvinyl acetal resins typically have acetal, hydroxyl, and acetyl groups in their side chains. The hydroxyl content (hydroxyl amount) of polyvinyl acetal resins is, for example, 17 mol% or more and 38 mol% or less, preferably 20 mol% or more and 36 mol% or less.

[0088] In addition, the degree of acetalization of the polyvinyl alcohol acetal resin is, for example, 42 mol% or more and 85 mol% or less, preferably 55 mol% or more and 80 mol% or less.

[0089] Furthermore, the degree of acetylation (acetyl group content) of the polyvinyl acetal resin is, for example, 0.01 mol% or more and 30 mol% or less, preferably 0.1 mol% or more and 25 mol% or less.

[0090] The hydroxyl content of polyvinyl acetal resin is expressed as a percentage, obtained by dividing the amount of ethylene bonded by the hydroxyl group by the total amount of ethylene in the main chain, and calculating the mole fraction. The amount of ethylene bonded by the hydroxyl group can be determined, for example, according to JIS K 6728 "Test Method for Polyvinyl Butyral".

[0091] The aforementioned degree of acetalization is expressed as a percentage, obtained by dividing the mole fraction obtained by subtracting the amount of hydroxyl-bonded ethylene and acetyl-bonded ethylene from the total amount of ethylene in the main chain by the total amount of ethylene in the main chain. The degree of acetalization (degree of butyralization) can be calculated from the results obtained according to JIS K 6728 "Test Method for Polyvinyl Butyral".

[0092] The degree of acetylation is expressed as a percentage, obtained by dividing the amount of ethylene bonded by the acetyl group by the total amount of ethylene in the main chain, and calculating the mole fraction. The amount of ethylene bonded by the acetyl group can be determined, for example, according to JIS K6728 "Test Method for Polyvinyl Butyral".

[0093] Polyvinyl acetal resin can typically be unmodified polyvinyl acetal resin, but it can also be modified polyvinyl acetal resin.

[0094] Modified polyvinyl acetal resin has a structure other than acetal, hydroxyl, and acetyl groups (modifying groups), and preferably has modifying groups on the side chain. Examples of modifying groups include groups having a polyepoxide structure on the side chain; groups having alkyl groups other than acetal and acetyl groups (e.g., about 2 to 30 carbon atoms) on the side chain.

[0095] (Ethylene-vinyl acetate copolymer resin)

[0096] The ethylene-vinyl acetate copolymer resin used in the first polymer sheets 20a, 20b and the gap-filling polymer sheet 30 can be a non-crosslinked ethylene-vinyl acetate copolymer resin or a high-temperature crosslinked ethylene-vinyl acetate copolymer resin. Alternatively, ethylene-vinyl acetate modified resins such as ethylene-vinyl acetate copolymer saponifications or ethylene-vinyl acetate hydrolysates can also be used as the ethylene-vinyl acetate copolymer resin.

[0097] The vinyl acetate content of the ethylene-vinyl acetate copolymer resin, as measured according to JIS K 6730 "Test Method for Ethylene-Vinyl Acetate Resin", is preferably 10% by mass or more and 50% by mass or less. By setting the vinyl acetate content to these lower limits or above, adhesion to glass sheets and the like becomes better, and consequently, the penetration resistance of the laminated glass becomes better. Furthermore, by setting the vinyl acetate content to these upper limits or below, the tensile strength of the interlayer for laminated glass increases, and the impact resistance of the laminated glass becomes better.

[0098] (Plasticizer)

[0099] When the resin used is a thermoplastic resin, the first polymer sheets 20a, 20b and the gap-filling polymer sheet 30 may further contain plasticizers. By containing plasticizers in the first polymer sheets 20a, 20b and the gap-filling polymer sheet 30, the interlayer film 1 for laminated glass becomes soft, and as a result, the laminated glass also becomes soft. Furthermore, when the glass plate is inorganic glass, the adhesion to the glass plate can also be improved. When using polyvinyl acetal resin as a thermoplastic resin, it is particularly effective if plasticizers are contained in the resin layer containing this thermoplastic resin.

[0100] The following describes in detail the plasticizers used in the first polymer sheets 20a, 20b and the gap-filling polymer sheet 30.

[0101] Plasticizers used in the first polymer sheets 20a and 20b and the interstitial polymer sheet 30 include, for example, organic ester plasticizers such as monobasic and polybasic organic esters, and phosphorus plasticizers such as organophosphoric acid plasticizers and organophosphorous acid plasticizers. Organic ester plasticizers are preferred. The aforementioned plasticizers are preferably liquid plasticizers. Furthermore, a liquid plasticizer refers to a plasticizer that is liquid at room temperature (23°C) and normal pressure (1 atmosphere).

[0102] As monobasic organic acid esters, esters of diols and monobasic organic acids can be listed. As diols, polyalkylene glycols can be listed where each alkylene unit has 2 to 4 carbon atoms, preferably 2 or 3 carbon atoms, and the number of repetitions of the alkylene unit is 2 to 10, preferably 2 to 4. Alternatively, monoalkylene glycols with 2 to 4 carbon atoms, preferably 2 or 3 carbon atoms, and a repeating unit of 1 can also be used.

[0103] As diols, specific examples include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, butanediol, etc.

[0104] As monoprotic organic acids, organic acids with 3 to 10 carbon atoms can be listed. Specifically, butyric acid, isobutyric acid, hexanoic acid, 2-ethylbutyric acid, 2-ethylpentanoic acid, heptanoic acid, octanoic acid, 2-ethylhexanoic acid, nonanoic acid, and decanoic acid can be listed.

[0105] As preferred monobasic organic acid esters, the following compounds represented by formula (1) can be listed.

[0106]

[0107] In formula (1) above, R1 and R2 represent organic groups with 2 to 10 carbon atoms, R3 represents ethylene, isopropylene, or n-propylene, and p represents an integer from 3 to 10. R1 and R2 in formula (1) above preferably have 5 to 10 carbon atoms, more preferably 6 to 10 carbon atoms. The organic groups of R1 and R2 are preferably hydrocarbon groups, more preferably alkyl groups.

[0108] In addition, specific diol esters include ethylene glycol di-2-ethylbutyrate, 1,2-propanediol di-2-ethylbutyrate, 1,3-propanediol di-2-ethylbutyrate, 1,4-butanediol di-2-ethylbutyrate, 1,2-butanediol di-2-ethylbutyrate, diethylene glycol di-2-ethylbutyrate, diethylene glycol dioctanoate, diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dioctanoate, triethylene glycol di-2-ethylvalerate, triethylene glycol di-n-heptanoate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylpropionate, tetraethylene glycol di-n-heptanoate, tetraethylene glycol di-2-ethylhexanoate, and tetraethylene glycol di-2-ethylbutyrate.

[0109] In addition, examples of polybasic organic acid esters include ester compounds of dibasic organic acids with 4 to 12 carbon atoms, such as adipic acid, sebacic acid, and azelaic acid, and alcohols with 4 to 10 carbon atoms. Alcohols with 4 to 10 carbon atoms can be straight-chain, branched, or cyclic.

[0110] Specifically, examples include dibutyl sebacate, dioctyl azelate, dihexyl adipate, dioctyl adipate, hexylcyclohexyl adipate, diisononyl adipate, heptylnonyl adipate, di(2-butoxyethyl) adipate, dibutylcarbitol adipate, and mixed adipates. Oil-modified sebacate alcohols are also possible. As mixed adipates, examples include adipates made from two or more alcohols selected from alkyl alcohols with 4 to 9 carbon atoms and cyclic alcohols with 4 to 9 carbon atoms.

[0111] Examples of organophosphate plasticizers include phosphate esters such as tributoxyethyl phosphate, isodecylphenyl phosphate, and triisopropyl phosphate.

[0112] Plasticizers can be used alone or in combination with two or more.

[0113] Of the above, the plasticizer is preferably selected from di(2-butoxyethyl) adipate (DBEA), triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutanoate (3GH) and triethylene glycol di-2-ethylpropionate, more preferably from triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutanoate (3GH) and triethylene glycol di-2-ethylpropionate, even more preferably from triethylene glycol di-2-ethylhexanoate and triethylene glycol di-2-ethylbutanoate, and particularly preferably from triethylene glycol di-2-ethylhexanoate.

[0114] In the first polymer sheets 20a, 20b and the gap-filling polymer sheet 30, the content of plasticizer is not particularly limited, but is preferably 10 parts by mass or more and 100 parts by mass or less, and more than 15 parts by mass or less and 90 parts by mass or less, relative to 100 parts by mass of thermoplastic resin.

[0115] The thickness of each of the first polymer sheets 20a and 20b is not particularly limited, for example, it is 50 μm or more and 1500 μm or less, preferably 100 μm or more and 1000 μm or less, and more preferably 150 μm or more and 900 μm or less.

[0116] When there are multiple first polymer sheets 20a and 20b, the total thickness of the first polymer sheets 20a and 20b is not particularly limited, for example, it is 100 μm or more and 3000 μm or less, preferably 200 μm or more and 2000 μm or less, and more preferably 300 μm or more and 1800 μm or less.

[0117] The thickness of the gap-filling polymer sheet 30 is preferably the same as the thickness of the functional film 10. From this point of view, the ratio of the thickness of the gap-filling polymer sheet 30 to the thickness of the functional film 10 (thickness of the gap-filling polymer sheet / thickness of the functional film) is preferably 0.5 or more and 1.5 or less, more preferably 0.8 or more and 1.2 or less.

[0118] At least one of the first polymer sheets 20a and 20b may contain a colorant. Colorants may include, for example, pigments and dyes. Pigments may include, for example, inorganic pigments such as titanium dioxide, iron oxide, etc. (metal oxide pigments), carbon black, clay, kaolin, barium sulfate, barium carbonate, calcium carbonate, talc, silica, and alumina; and organic pigments such as azo pigments, quinacridone pigments, diketopyrrolopyrrole pigments, perylene pigments, pyrene pigments, benzimidazolone pigments, reduction pigments, isoindoline pigments, isoindolineone pigments, metal chelate azo pigments, phthalocyanine pigments, indanone pigments, dioxane pigments, and indigo pigments, but are not limited to these. As for dyes, known dyes may be used, including azo dyes, anthraquinone dyes, indigo dyes, and uranium dyes.

[0119] At least one of the first polymer sheets 20a and 20b may contain a heat-insulating agent. Since the heat-insulating agent also blocks a certain amount of visible light, the first polymer sheets 20a and 20b may also be colored by containing a heat-insulating agent.

[0120] As a heat insulation agent, a typical example is a material capable of absorbing infrared radiation, i.e., heat rays, with wavelengths above 780 nm. Heat insulation agents are composed of inorganic materials, typically using heat-insulating particles. Specific examples include particles other than metal oxide particles, such as metal oxide particles and lanthanum hexaboride (LaB6) particles. Examples of metal oxide particles include tin oxide particles such as aluminum-doped tin oxide particles, indium-doped tin oxide particles, and 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); tin-doped zinc oxide particles and silicon-doped zinc oxide particles; titanium oxide particles such as niobium-doped titanium oxide particles; indium oxide particles such as tin-doped indium oxide particles (ITO particles); sodium-doped tungsten oxide particles; cesium-doped tungsten oxide particles (CWO particles); thallium-doped tungsten oxide particles; and rubidium-doped tungsten oxide particles. Other heat-insulating particles can also be used. A single heat insulation agent can be used, or two or more can be used in combination.

[0121] Furthermore, when multiple first polymer sheets are provided (e.g., when first polymer sheets 20a and 20b are provided), the multiple first polymer sheets can have different compositions to perform different functions. For example, first polymer sheet 20a can contain a heat-insulating agent, and first polymer sheet 20b can contain a colorant. Additionally, for example, first polymer sheet 20a can contain at least any one of a heat-insulating agent and a colorant, while first polymer sheet 20b may not contain a heat-insulating agent or a colorant.

[0122] Functional thin films can be dimming films, display element films, or optical films. As optical films, examples include films that have the function of absorbing specific light or reflecting specific light; specifically, examples include polarizing films, phase difference films, and anti-reflection films.

[0123] Examples of functional thin films include P-polarized light reflective films, holographic films, heat-reflective films, dimming films, display element films, transparent conductive films, touch sensor films, circuit films, solar films, and films capable of electrical control. Among these, heat-reflective films and dimming films are preferred.

[0124] The material of the functional film is not particularly limited, and may include at least polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), (meth)acrylic resins, TAC, PES resins, and polyimide resins, among which polyethylene terephthalate resin is preferred. Furthermore, the outermost surface of the functional film preferably contains a thermoplastic resin. For example, by making the outermost surface of the functional film 10 in contact with the first polymer sheet 20a contain a thermoplastic resin, the functional film 10 can be easily bonded to the first polymer sheet 20a by heat pressing. Similarly, as described later, by making the outermost surface of the functional film 10 in contact with the second polymer sheet 40 contain a thermoplastic resin, it can be easily bonded to the second polymer sheet 40 by heat pressing.

[0125] In addition, the functional film 10 preferably includes a PET film, and the PET film is preferably disposed at the position in contact with the first polymer sheet 20a.

[0126] A heat-reflective film is a thin-film component having an infrared reflective layer. Specifically, a heat-reflective film preferably comprises two resin films and an infrared reflective layer disposed between the two resin films. Examples of infrared reflective layers include resin films with metal foil, multilayer laminated films with a metal layer and a dielectric layer formed on the resin layer, multilayer resin films, and liquid crystal films. The resin film used in the infrared reflective film is not particularly limited, and examples include films containing polyethylene terephthalate resin (e.g., PET film), polyester resin films such as PEN film, (meth)acrylic resin films, TAC films, PES resin films, and polyimide resin films. Among these, polyester resin films are preferred from the viewpoint of operability, and PET films are more preferred. A heat-reflective film may omit the resin films and consist only of an infrared reflective layer.

[0127] A dimming film is a thin-film component having a dimming element. Specifically, the dimming element is preferably a dimming film having two resin films and a dimming layer disposed between the two resin films. The resin film used as the dimming element is not particularly limited, and examples include films containing polyethylene terephthalate resin (e.g., PET film), polyester resin films such as PEN film, (meth)acrylic resin films, TAC films, PES resin films, polyimide resin films, etc. Among these, polyester resin films are preferred from the viewpoint of operability, and PET films are more preferred. Furthermore, a conductive layer constituting an electrode is provided on the surface of each of the two resin films on the dimming layer side.

[0128] The dimming layer changes the visible light transmittance by switching the voltage applied between the conductive layers of two resin films and not applying it. The dimming layer is composed of a liquid crystal layer such as polymer-dispersed liquid crystal (PDLC), and the dimming film can be a PDLC film. Alternatively, the dimming film can also be an SPD (Suspended Particle Device) film, an electrochromic film, an electrophoretic film device, a GHLC (Guest-Host Liquid Crystal) film, or a PNLC (Polymer Network Liquid Crystal) film. Therefore, the dimming layer can be an SPD layer containing a resin matrix and a light-modifying suspension dispersed in the resin matrix, or it can be an electrochromic material layer. Alternatively, it can be an electrophoretic layer containing electrophoretic particles and a dispersant for dispersing the electrophoretic particles.

[0129] The thickness of the functional film is not particularly limited, for example, it is 30 μm or more and 1200 μm or less, preferably 50 μm or more and 1000 μm or less, more preferably 75 μm or more and 750 μm or less, and even more preferably 100 μm or more and 500 μm or less.

[0130] In the first embodiment of the present invention, the polymer sheet side 2 of the interlayer film 1 for laminated glass can be protected by a release film. As the release film, a resin film can be used, preferably a resin film having a release-treated surface treated with a silicone release agent or the like.

[0131] [Intermediate film for laminated glass according to the second embodiment]

[0132] Reference Figure 3 The interlayer for laminated glass according to the second embodiment of the present invention will be described. It should be noted that the description mainly focuses on the differences between the interlayer for laminated glass and the first embodiment of the present invention, while the description of the similarities to the interlayer for laminated glass in the first embodiment of the present invention is omitted.

[0133] The interlayer film 1B for laminated glass in the second embodiment of the present invention differs from the interlayer film for laminated glass in that it also includes a second polymer sheet 40.

[0134] That is, in addition to the functional film 10, polymer sheets 20a and 20b, and gap-filling polymer sheet 30, the interlayer film 1B for laminated glass of the second embodiment of the present invention also includes a second polymer sheet 40 disposed on the other side of the functional film 10. In this embodiment, by providing the second polymer sheet 40, the interlayer film 1B for glass can be easily bonded to the glass plate without the need for additional resin layers or the like on both sides 2 and 3.

[0135] It should be noted that in the interlayer film 1B for laminated glass according to the second embodiment of the present invention, the second polymer sheet 40 can be one sheet or two or more sheets. Two or more second polymer sheets 40 can be stacked in the thickness direction.

[0136] In the thickness direction projection view, the functional film 10 may be contained within at least the region of the second polymer sheet 40 in contact with the functional film 10, which means that in the thickness direction projection view, the functional film 10 is entirely contained within the region of the second polymer sheet 40. Furthermore, in the thickness direction projection view, at least a portion of the outer periphery of the functional film 10 may exist inside the outer periphery of the second polymer sheet 40; preferably, the entire outer periphery of the functional film 10 may exist inside the outer periphery of the second polymer sheet 40.

[0137] The surface roughness (R) of the second polymer sheet side surface 3 in the interlayer film 1B for laminated glass according to the second embodiment of the present invention zjis94 The surface roughness (R) is preferably 1 μm or more and 100 μm or less. In the second embodiment of the interlayer film 1B for laminated glass of the present invention, the second polymer sheet side surface 3 is another surface constituting the interlayer film 1 for laminated glass, and is the surface that contacts the glass plate when bonded to it. The surface roughness (R) of the second polymer sheet side surface 3 in the interlayer film 1B for laminated glass of the second embodiment of the present invention is... zjis94 When the surface roughness (R) is 1 μm or more and 100 μm or less, it is possible to further suppress the occurrence of air residue when the interlayer film 1B for laminated glass of the second embodiment of the present invention is pressed onto a glass plate. From this point of view, the surface roughness (R) of the second polymer sheet side surface 3 in the interlayer film 1B for laminated glass of the second embodiment of the present invention is... zjis94 More preferably, the micrometer is 3μm or more and 80μm or less; even more preferably, it is 5μm or more and 70μm or less; and even more preferably, it is 25μm or more and 50μm or less.

[0138] Similar to the interlayer film 1 for laminated glass in the first embodiment of the present invention, for example, by forming an uneven shape on the second polymer sheet side surface 3 of the interlayer film 1B for laminated glass in the second embodiment of the present invention, the surface roughness (R) of the second polymer sheet side surface 3 of the interlayer film 1B for laminated glass in the second embodiment of the present invention can be improved. zjis94 The diameter is 1 μm or more and 100 μm or less. There are no particular limitations on the method for forming the uneven shape; for example, lip embossing, embossing roller method, and calendering roller method can be listed. It should be noted that the unevenness of the surface 3 on the second polymer sheet side of the interlayer film 1B for laminated glass in the second embodiment of the present invention can have a regular shape or an irregular shape.

[0139] In a projection view along the thickness direction, the outer perimeter of the gap-filling polymer sheet 30 can be larger than, smaller than, or the same as the outer perimeter of the second polymer sheet 40. It should be noted that "larger than the outer perimeter" means that, in the projection view, the outer perimeter of the gap-filling polymer sheet 30 is generally located on the outer side compared to the outer perimeter of the second polymer sheet 40; "smaller than the outer perimeter" means that, in the projection view, the outer perimeter of the gap-filling polymer sheet 30 is generally located on the inner side compared to the outer perimeter of the second polymer sheet 40; and "the same as" means that, in the projection view, the outer perimeter of the gap-filling polymer sheet 30 is identical to the outer perimeter of the second polymer sheet 40.

[0140] In the thickness direction projection view, the distance (W2) between the outer periphery of the second polymer sheet 40 and the outer periphery of the gap-filling polymer sheet 30 is preferably 0 mm or more and 10 mm or less throughout the entire circumference. If the distance (W2) between the outer periphery of the second polymer sheet 40 and the outer periphery of the gap-filling polymer sheet 30 is 0 mm or more and 10 mm or less in the thickness direction projection view, it is easier to maintain a constant thickness of the interlayer film 1A for laminated glass when it is provided between the two glass plates. From this perspective, in the thickness direction projection view, the distance (W2) between the outer periphery of the second polymer sheet 40 and the outer periphery of the gap-filling polymer sheet 30 is more preferably 0 mm or more and 5 mm or less throughout the entire circumference, further preferably 0 mm or more and 3 mm or less, and even more preferably 0 mm or more and 1 mm or less.

[0141] In a projection view along the thickness direction, the outer perimeter of the second polymer sheet 40 can be larger, smaller, or the same as the outer perimeter of the first polymer sheets 20a and 20b. It should be noted that "larger than the outer perimeter" means that, in the projection view, the outer perimeter of the second polymer sheet 40 is generally on the outer side compared to the outer perimeters of the first polymer sheets 20a and 20b. "Smaller than the outer perimeter" means that, in the projection view, the outer perimeter of the second polymer sheet 40 is generally on the inner side compared to the outer perimeters of the first polymer sheets 20a and 20b. "The same" means that, in the projection view, the outer perimeter of the second polymer sheet 40 is consistent with the outer perimeters of the first polymer sheets 20a and 20b.

[0142] In the thickness direction projection view, the distance between the outer periphery of the first polymer sheets 20a and 20b and the outer periphery of the second polymer sheet 40 is preferably 0 mm or more and 10 mm or less throughout the entire circumference. If, in the thickness direction projection view, the distance between the outer periphery of the first polymer sheets 20a and 20b and the outer periphery of the second polymer sheet 40 is 0 mm or more and 10 mm or less, then when an interlayer film 1B for laminated glass is provided between the two glass plates, it is easier to maintain a constant thickness of the interlayer film 1B for laminated glass. From this viewpoint, in the thickness direction projection view, the distance between the outer periphery of the first polymer sheets 20a and 20b and the outer periphery of the second polymer sheet 40 is more preferably 0 mm or more and 5 mm or less throughout the entire circumference, further preferably 0 mm or more and 3 mm or less, and even more preferably 0 mm or more and 1 mm or less. Figure 4 As shown, preferably, the sizes of the outer peripheries 22a, 22b of each of the first polymer sheets 20a, 20b are the same as the size of the outer periphery 42 of the second polymer sheet 40 and the size of the outer periphery 32 of the gap-filling polymer sheet 30C. Particularly preferred is that, in the thickness direction projection view, the outer peripheries 22a, 22b of the first polymer sheets 20a, 20b and the outer periphery 42 of the second polymer sheet 40 and the outer periphery 32 of the gap-filling polymer sheet 30C are arranged in the same position.

[0143] Similar to the first polymer sheets 20a and 20b and the gap-filling polymer sheet 30, the second polymer sheet 40 also contains resin. The resin used in the second polymer sheet 40 can be a curable resin such as a thermosetting resin or a moisture-curing resin, preferably a thermoplastic resin. By using a thermoplastic resin, the first polymer sheet 20a, the second polymer sheet 40, and the gap-filling polymer sheet 30 can be easily bonded together by heat pressing.

[0144] Examples of thermoplastic resins used in the second polymer sheet 40 include (meth)acrylic resins, polyvinyl acetal resins, polyvinyl alcohol resins (PVA), polyurethane resins (PU), ethylene-vinyl acetate copolymer resins (EVA), ethylene-vinyl acetate copolymer saponification (EVOH), ethylene-methacrylic acid copolymer resins, ionomer resins, isobutylene resins, styrene-isoprene copolymer resins, and styrene-butadiene copolymer resins.

[0145] Among the above, the thermoplastic resins are preferably polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, and (meth)acrylic resin, more preferably polyvinyl acetal resin and ethylene-vinyl acetate copolymer resin, and even more preferably polyvinyl acetal resin. By using polyvinyl acetal resin, the laminated glass readily exhibits excellent impact resistance and good adhesion to the glass sheet.

[0146] The second polymer sheet 40 preferably comprises at least one thermoplastic resin selected from the group consisting of polyvinyl acetal resin and ethylene-vinyl acetate copolymer resin. This further improves the impact resistance of the laminated glass.

[0147] The first polymer sheets 20a, 20b, the second polymer sheet 40, and the gap-filling polymer sheet 30 preferably use the same type of resin. Using the same resin facilitates heat bonding between them. Therefore, the resins used in the first polymer sheets 20a, 20b, the second polymer sheet 40, and the gap-filling polymer sheet 30 are preferably all polyvinyl acetal resins, and also preferably all ethylene-vinyl acetate copolymer resins.

[0148] The thickness of the second polymer sheet 40 is not particularly limited, for example, it is 50 μm or more and 1500 μm or less, preferably 100 μm or more and 1000 μm or less, and more preferably 150 μm or more and 900 μm or less.

[0149] When multiple second polymer sheets are present, the total thickness of the second polymer sheets is not particularly limited, for example, it is 150 μm or more and 3000 μm or less, preferably 200 μm or more and 2000 μm or less, and more preferably 300 μm or more and 1800 μm or less.

[0150] In the second embodiment of the present invention, the second polymer sheet side surface 3 of the interlayer film 1B for laminated glass can be protected by a protective release film. As the protective release film, a resin film can be used, preferably a resin film having a release-treated surface treated with a silicone release agent or the like.

[0151] [Intermediate film for laminated glass according to the third embodiment]

[0152] like Figure 5 As shown, in the glass interlayer film 1D of the third embodiment of the present invention, the gap-filling polymer sheet 30D having the opening 31 is composed of a plurality of polymer sheets 30a to 30d arranged in the planar direction. Other than this, it is the same as the interlayer film for laminated glass of the first embodiment of the present invention. Therefore, the waste of polymer sheets when cutting from polymer sheets to manufacture the gap-filling polymer sheet 30D can be reduced. It should be noted that the gap-filling polymer sheet 30D can be composed of 4 polymer sheets, or 2 polymer sheets, or 3 polymer sheets, or 5 or more polymer sheets. Furthermore, as... Figure 6 As shown, when the gap-filling polymer sheet 30E is composed of a plurality of polymer sheets arranged in a planar direction, the positional relationship between the outer peripheries 22a, 22b of the first polymer sheets 20a, 20b and the outer periphery of the gap-filling polymer sheet 30E is also as described in the first embodiment. The positional relationship between the inner periphery of the gap-filling polymer sheet 30E and the outer periphery of the functional film is also the same.

[0153] [Intermediate film for laminated glass according to the fourth embodiment]

[0154] like Figure 7 As shown, in the glass interlayer 1F of the fourth embodiment of the present invention, the gap-filling polymer sheet 30F having the opening 31 is composed of a plurality of polymer sheets 30a to 30d arranged in a planar direction. Other than this, it is the same as the interlayer for laminated glass of the second embodiment of the present invention. Therefore, the waste of polymer sheets when cutting from polymer sheets to manufacture the gap-filling polymer sheet 30F can be reduced. Furthermore, the gap-filling polymer sheet 30F can be composed of 4 polymer sheets, 2 polymer sheets, 3 polymer sheets, or 5 or more polymer sheets. Additionally, as... Figure 8 As shown, when the gap-filling polymer sheet 30G is composed of a plurality of polymer sheets arranged in a planar direction, it is particularly preferable that, in the projection view in the thickness direction, the positions of the outer peripheries 22a, 22b of each of the first polymer sheets 20a, 20b and the position of the outer periphery of the second polymer sheet 40 are the same as the position of the outer periphery 32 of the gap-filling polymer sheet 30G.

[0155] [Intermediate film for laminated glass according to the fifth embodiment]

[0156] like Figure 9As shown, the interlayer film 1H for laminated glass according to the fifth embodiment of the present invention further includes a third polymer sheet 50, which is disposed on the side 33 of the gap-filling polymer sheet 30 opposite to the side of the first polymer sheet. Therefore, by utilizing the height difference following property of the third polymer sheet 50, it is easier to suppress the occurrence of height differences in the thickness direction of the interlayer film for laminated glass.

[0157] In the thickness direction of the projection view, the outer periphery of the third polymer sheet 50 can be further outward, further inward, or the same as the outer periphery of the gap-filling polymer sheet 30.

[0158] In the thickness direction projection view, the distance between the outer periphery of the third polymer sheet 50 and the outer periphery of the gap-filling polymer sheet 30 is preferably 0 mm or more and 5 mm or less throughout the entire circumference. If the distance between the outer periphery of the third polymer sheet 50 and the outer periphery of the gap-filling polymer sheet 30 is 0 mm or more and 5 mm or less in the thickness direction projection view, it is easier to maintain a constant thickness of the interlayer film 1J when it is provided on two glass plates. From this perspective, in the thickness direction projection view, the distance between the outer periphery of the third polymer sheet 50 and the outer periphery of the gap-filling polymer sheet 30 is more preferably 0 mm or more and 3 mm or less throughout the entire circumference, and even more preferably 0 mm or more and 1 mm or less.

[0159] The outer periphery of the first polymer sheets 20a and 20b can be further outward than the outer periphery of the third polymer sheet 50, or it can be further inward than the outer periphery of the third polymer sheet 50, or it can be the same.

[0160] In the thickness direction projection view, the distance between the outer periphery of the first polymer sheets 20a and 20b and the outer periphery of the third polymer sheet 50 is preferably 0 mm or more and 5 mm or less throughout the entire circumference. In the thickness direction projection view, if the distance between the outer periphery of the first polymer sheet 20a and the outer periphery of the third polymer sheet 50 is 0 mm or more and 5 mm or less, then when an interlayer film 1H for laminated glass is provided between the two glass plates, it is easier to keep the thickness of the interlayer film 1H constant. From this viewpoint, in the thickness direction projection view, the distance between the outer periphery of the first polymer sheets 20a and 20b and the outer periphery of the third polymer sheet 50 is more preferably 0 mm or more and 3 mm or less throughout the entire circumference, and even more preferably 0 mm or more and 1 mm or less.

[0161] like Figure 10 As shown, in the projection view in the thickness direction, it is particularly preferred that the positions of the outer peripheries 22a and 22b of the first polymer sheets 20a and 20b are the same as the positions of the outer periphery 52 of the third polymer sheet 50 and the outer periphery 32 of the gap-filling polymer sheet 30I.

[0162] Similar to the first polymer sheets 20a, 20b and the gap-filling polymer sheet 30, the resin used for the third polymer sheet 50 and the resin-containing second polymer sheet 40 can be a thermosetting resin, a moisture-curing resin, or a curable resin, but a thermoplastic resin is preferred. By using a thermoplastic resin, the first polymer sheet 20b, the gap-filling polymer sheet 30, and the third polymer sheet 50 can be easily bonded to each other by heat pressing.

[0163] The thermoplastic resins used in the third polymer sheet 50 may include, for example, (meth)acrylic resins, polyvinyl acetal resins, polyvinyl alcohol (PVA) resins, polyurethane (PU) resins, ethylene-vinyl acetate copolymer resins (EVA), ethylene-vinyl acetate copolymer saponification (EVOH), ethylene-methacrylic acid copolymer resins, ionomer resins, isobutylene resins, styrene-isoprene copolymer resins, and styrene-butadiene copolymer resins.

[0164] Among the above, the thermoplastic resins are preferably polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, and (meth)acrylic resin, more preferably polyvinyl acetal resin and ethylene-vinyl acetate copolymer resin, and even more preferably polyvinyl acetal resin. By using polyvinyl acetal resin, the laminated glass readily exhibits excellent impact resistance and good adhesion to the glass sheet.

[0165] The third polymer sheet 50 preferably comprises at least one thermoplastic resin selected from the group consisting of polyvinyl acetal resin and ethylene-vinyl acetate copolymer resin. This further improves the impact resistance of the laminated glass.

[0166] The first polymer sheet 20b, the gap-filling polymer sheet 30, and the third polymer sheet 50 preferably use the same resin. Using the same resin facilitates heat bonding between them. Therefore, the resins used in the first polymer sheet 20b, the gap-filling polymer sheet 30, and the third polymer sheet 50 are preferably all polyvinyl acetal resins, and also preferably all ethylene-vinyl acetate copolymer resins.

[0167] The thickness of the third polymer sheet 50 is not particularly limited, for example, it is 50 μm or more and 1500 μm or less, preferably 100 μm or more and 1000 μm or less, and more preferably 150 μm or more and 900 μm or less.

[0168] When multiple third polymer sheets are present, the total thickness of the third polymer sheets is not particularly limited, for example, it is 100 μm or more and 3000 μm or less, preferably 200 μm or more and 2000 μm or less, and more preferably 300 μm or more and 1800 μm or less.

[0169] The interlayer for laminated glass in the fifth embodiment of the present invention may also further include a second polymer sheet 40 disposed on the other side of the functional film 10, similar to the interlayer for laminated glass 1B in the second embodiment of the present invention.

[0170] [Intermediate film for laminated glass according to the sixth embodiment]

[0171] like Figure 16 As shown, in the interlayer film 1J for laminated glass according to the sixth embodiment of the present invention, a portion of the gap-filling polymer sheet 30J is cut (refer to reference numeral 34). This facilitates the passage of wiring for the functional thin film through the gap-filling polymer sheet 30J. In this case, the outer periphery of the gap-filling polymer sheet 30J refers to the outer periphery excluding the cut portion 34. Furthermore, in this case, "covering the entire periphery" means covering the entire outer periphery of the gap-filling polymer sheet 30J excluding the cut portion 34. In the interlayer film 1J for laminated glass according to the sixth embodiment of the present invention, the gap-filling polymer sheet 30J may have one cut portion, or two or more. It should be noted that the proportion of the cut portion is not particularly limited, but based on the outer periphery of the gap-filling polymer sheet, it is, for example, 20% or less, preferably 0.1% or more and 10% or less, more preferably 0.2% or more and 5% or less. Additionally, in the interlayer films for laminated glass according to the first to fifth embodiments of the present invention, a portion of the gap-filling polymer sheet may also be cut.

[0172] [Intermediate film for laminated glass according to the seventh embodiment]

[0173] like Figure 17 As shown, the interlayer film 1K for laminated glass according to the seventh embodiment of the present invention includes a functional film 10a in addition to the functional film 10. It should be noted that the interlayer film 1K for laminated glass according to the seventh embodiment of the present invention includes two functional films 10 and 10a, but the interlayer film for laminated glass according to the seventh embodiment of the present invention may also include three or more functional films. This increases the functionality of the interlayer film for laminated glass.

[0174] Furthermore, when the interlayer film for laminated glass has multiple functional films, it can be used as follows: Figure 17 As shown in the laminated glass, the polymer sheet 20a is positioned between two functional films 10, 10a, similar to the interlayer film 1K. This prevents peeling between the two functional films 10, 10a.

[0175] The interlayer films for laminated glass in the first to seventh embodiments can be combined with each other.

[0176] The interlayer film for laminated glass in the first to seventh embodiments is merely an example of the interlayer film for laminated glass of the present invention. Therefore, the interlayer film for laminated glass in the first to seventh embodiments does not limit the interlayer film for laminated glass of the present invention.

[0177] [Manufacturing method of interlayer film for laminated glass]

[0178] The manufacturing method of the interlayer film for laminated glass of the present invention includes a step of laminating the functional film, the first polymer sheet, and the gap-filling polymer sheet in a manner arranged in the order of a functional film, a first polymer sheet, and a gap-filling polymer sheet. In this step, it is not necessary to laminate the functional film, the first polymer sheet, and the gap-filling polymer sheet all at once. For example, after laminating one or more polymer sheets on one side of the functional film, the gap-filling polymer sheet may be laminated on the side of the polymer sheet laminated with the functional film opposite to the functional film side. The functional film and polymer sheet used in the manufacturing method of the interlayer film for laminated glass of the present invention have already been described in the section on interlayer films for laminated glass, therefore, the description of the functional film and polymer sheet is omitted. Conventionally known methods can be used for the methods of laminating one or more polymer sheets on one side of the functional film and for laminating the gap-filling polymer sheet on the side of the polymer sheet laminated with the functional film opposite to the functional film side.

[0179] The interlayer film for laminated glass according to the second embodiment of the present invention can be manufactured, for example, by a manufacturing method including the following steps: stacking the second polymer sheet, the functional film, the first polymer sheet, and the gap-filling polymer sheet in the order of a second polymer sheet, a functional film, a first polymer sheet, and a gap-filling polymer sheet. Furthermore, the interlayer film for laminated glass according to the fifth embodiment of the present invention can be manufactured, for example, by a manufacturing method including the following steps: stacking the functional film, the first polymer sheet, the gap-filling polymer sheet, and the third polymer sheet in the order of a functional film, a first polymer sheet, a gap-filling polymer sheet, and a third polymer sheet. Furthermore, the interlayer film for laminated glass according to the seventh embodiment of the present invention can be manufactured, for example, by a manufacturing method including the following steps: stacking the second polymer sheet, the functional film, the first polymer sheet, the functional film, the third polymer sheet, and the gap-filling polymer sheet in the order of a second polymer sheet, a functional film, a first polymer sheet, a functional film, a third polymer sheet, and the gap-filling polymer sheet.

[0180] Furthermore, after at least the functional film, the first polymer sheet, and the gap-filling polymer sheet are laminated as described above, hot pressing can be performed, for example, to integrate the functional film, the first polymer sheet, and the gap-filling polymer sheet.

[0181] Furthermore, if surfaces 2 and 3 have unevenness, the unevenness can be formed on the surfaces of the first polymer sheet, the gap-filling polymer sheet, the second polymer sheet, the third polymer sheet, etc., and then the unevenness can be formed on the surface of the interlayer film for laminated glass by stacking the polymer sheets. Alternatively, the unevenness can be formed on the surface of the interlayer film for laminated glass after the interlayer film for laminated glass is manufactured by stacking polymer sheets. It should be noted that, as described above, there is no particular limitation on the method of forming unevenness on the surface of the polymer sheet or the interlayer film for laminated glass; for example, the lip embossing method, the embossing roller method, and the calendering roller method can be listed.

[0182] Laminated glass

[0183] The laminated glass of the present invention comprises a pair of glass plates and an interlayer film of the present invention disposed between the pair of glass plates.

[0184] (glass plate)

[0185] The glass sheet used in the laminated glass of this invention can be either inorganic glass or organic glass, with inorganic glass being preferred. There are no particular limitations on the type of inorganic glass; examples include transparent glass, float glass, tempered glass, tinted glass, polished glass, patterned glass, wire-embedded glass, wire-embedded glass, ultraviolet-absorbing glass, infrared-reflecting glass, infrared-absorbing glass, and green glass.

[0186] In addition, as for acrylic glass, glass commonly used is called resin glass, which includes various types such as polycarbonate sheets, polymethyl methacrylate sheets, (meth)acrylic sheets, acrylonitrile-styrene copolymer sheets, acrylonitrile-butadiene-styrene copolymer sheets, polyethylene terephthalate sheets, fluorinated resin sheets, polyvinyl chloride sheets, chlorinated polyvinyl chloride sheets, polypropylene sheets, polystyrene sheets, polysulfone sheets, epoxy resin sheets, phenolic resin sheets, unsaturated polyester resin sheets, and polyimide resin sheets. Acrylic resin sheets can undergo appropriate surface treatments.

[0187] The laminated glass of the present invention uses a pair of glass plates that can be made of the same material or different materials. For example, one can be inorganic glass and the other can be organic glass; preferably, both glass plates are inorganic glass or organic glass.

[0188] Furthermore, the thickness of each glass plate in a pair is not particularly limited, for example, it is about 0.1 to 15 mm, preferably 0.5 to 5 mm. The thickness of the pair of glass plates can be the same or different.

[0189] (The layer composition of laminated glass)

[0190] Next, the layer structure of the laminated glass will be described in detail with reference to the accompanying drawings and embodiments. In this invention, in addition to the interlayer film for laminated glass of this invention, a polymer sheet 80 may also be provided between a pair of glass plates. For example, such as... Figure 11 As shown, in the first embodiment of the present invention, the laminated glass 100 may have an interlayer film 1 for laminated glass of the first embodiment of the present invention disposed between a pair of glass plates 60 and 70, and a polymer sheet 80 is disposed on the side of the functional film 10 of the interlayer film 1 opposite to the side on which the first polymer sheets 20a and 20b are disposed. Figure 11 In the laminated glass 100 shown, the polymer sheet 80 can be one sheet or more sheets.

[0191] Of course, in this invention, the laminated glass may also consist of only an interlayer film for laminated glass as described in this invention between a pair of glass plates. For example, such as Figure 12 As shown, in the second embodiment of the present invention, the laminated glass 100A may also have an interlayer film 1B for laminated glass of the second embodiment of the present invention provided between a pair of glass plates 60 and 70, and the pair of glass plates 60 and 70 are bonded together only by means of the interlayer film 1B.

[0192] (Manufacturing method of laminated glass)

[0193] The laminated glass of the present invention can be manufactured by the following method: placing an interlayer film for laminated glass between a pair of glass plates, pressing them together to obtain laminated glass.

[0194] In the above manufacturing method, firstly, two glass plates and the interlayer film for laminated glass of the present invention are prepared. Then, the interlayer film for laminated glass is placed between a pair of glass plates, and they are bonded together to form an integral laminated glass.

[0195] Alternatively, components constituting the interlayer film for laminated glass of the present invention can be prepared, and components constituting the interlayer film for laminated glass of the present invention can be arranged between a pair of glass plates, and they can be pressed together to form laminated glass of the present invention.

[0196] The above bonding can be performed using a vacuum bag, a low-temperature autoclave, a vacuum laminator, or other pressurizing methods, with a vacuum bag being the preferred method. Additionally, temporary pressing can be performed using rubber rollers or similar devices before the bonding process.

[0197] In this manufacturing method, the above-mentioned bonding is preferably performed under low-temperature conditions; specifically, the pressing can be performed at a temperature below 110°C. Furthermore, the above-mentioned bonding is preferably performed under low temperature and low pressure conditions; specifically, the pressing is preferably performed at a temperature below 110°C and a pressure below 1.0 MPa. Thus, by performing bonding under low-temperature and low-pressure conditions, functional degradation or deactivation of the functional film can be prevented.

[0198] From the viewpoint of more reliably preventing functional degradation and deactivation of the functional film, the temperature during lamination is preferably below 100°C, and from the viewpoint of preventing the generation of residual air and foaming, it is preferably above 60°C, and more preferably above 70°C.

[0199] Furthermore, from the viewpoint of more reliably preventing functional degradation and deactivation of the functional film, the pressure during lamination is preferably 1.2 MPa or less. Additionally, when the lamination is performed under negative pressure, such as when using a vacuum bag, for example, 0.095 MPa or less is acceptable, preferably 0.08 MPa or less, and more preferably 0.06 MPa or less.

[0200] There is no particular limitation on the lower limit of the pressure during bonding. For example, when the bonding is performed under pressure, such as in an autoclave, it is preferably 0.5 MPa or more, and more preferably 0.7 MPa or more. In addition, when the bonding is performed under negative pressure, such as when using a vacuum bag, it is preferably 0.001 MPa or more, and more preferably 0.005 MPa or more.

[0201] In addition, there is no particular limitation on the bonding time under the above temperature and pressure, for example, it is 5 minutes to 120 minutes, preferably 10 minutes to 60 minutes.

[0202] The laminated glass of this invention is not particularly limited and can be used for various purposes. For example, the laminated glass of this invention can be used for windows in various vehicles such as automobiles and trams, ships and airplanes, or various buildings such as buildings, apartments, detached houses, halls, and stadiums, or for working machinery such as cutting and grinding machines, construction machinery such as excavators and cranes, as well as for partitions inside various vehicles and buildings. Among these, applications in automobiles and other vehicles are preferred, and applications in vehicle windows are even more preferred.

[0203] Furthermore, for example, when a display device is constructed from laminated glass components, the laminated glass of the present invention can be used for various display applications. For display applications, the aforementioned window glass and partitions can be used as displays.

[0204] In addition, laminated glass can be used as protective glass for various displays, such as automotive displays.

[0205] Example

[0206] The present invention will be further described in detail below using examples, but the present invention is not limited to these examples.

[0207] It should be noted that the methods for determining various physical properties are as follows.

[0208] Evaluation of Interlayer Films for Laminated Glass

[0209] 1. Surface roughness

[0210] The surface roughness (R) of the interlayer film for laminated glass with polymer sheet side surface for gap filling zjis94 ) and the surface roughness (R) of the interlayer film for the laminated glass on the side of the second polymer sheet zjis94 The determination shall be performed using the method described in the above instructions.

[0211] 2. Thickness

[0212] The thickness of the intermediate film for laminated glass is measured using a thickness gauge and evaluated according to the following criteria.

[0213] A: 1 ≤ T1 / T2 ≤ 1.05 or 1 ≤ T2 / T1 ≤ 1.05

[0214] B: 1.05 < T1 / T2 ≤ 1.1 or 1.05 < T2 / T1 ≤ 1.1

[0215] C: T1 / T2 > 1.1 or T2 / T1 > 1.1

[0216] T1: The thickness of the interlayer in laminated glass corresponding to the center position of the functional film (refer to...). Figure 13 )

[0217] T2: Thickness of the interlayer film in laminated glass at the location where no functional film exists (refer to...). Figure 13 )

[0218] 3. Gaps

[0219] The cross-section of the intermediate film for laminated glass was observed under a microscope and evaluated according to the following criteria.

[0220] A: The ends of the functional film have a gap of 0-3mm.

[0221] B: The ends of the functional film have a gap of 3-5mm.

[0222] C: The ends of the functional film have gaps exceeding 5mm.

[0223] <Evaluation of Laminated Glass>

[0224] 1. Cracks

[0225] The laminated glass obtained through visual inspection shall be evaluated according to the following criteria.

[0226] A: None of the glass plates in the 5 sheets have cracks.

[0227] B: One of the five glass plates has a crack.

[0228] C: More than 2 out of 5 glass plates have cracks.

[0229] 2. Foaming

[0230] The resulting laminated glass was heated in an oven at 140°C for 2 hours.

[0231] Next, after removing the laminated glass from the oven and allowing it to cool for 3 hours, visually inspect the appearance of the laminated glass and evaluate whether foaming (bubbles) occurs in the portion of the laminated glass where the functional film exists and around the ends of the functional film, according to the following criteria.

[0232] A: None of the 5 glass plates have bubbles. Or, only 1 plate has bubbles.

[0233] B: Two or three of the five glass plates have foaming (bubbles).

[0234] C: More than 4 out of 5 glass plates have foaming (bubbles).

[0235] [Example 1]

[0236] (Preparation of the interlayer film for laminated glass)

[0237] Prepare a PDLC film (200mm long × 200mm wide × 385μm thick) (A1) as functional film 10.

[0238] Prepare a PVB sheet (305mm long × 305mm wide × 380μm thick) (B1) as the first polymer sheet 20a.

[0239] Prepare a PVB sheet (305mm long × 305mm wide × 380mm thick) (B2) as the second polymer sheet 40.

[0240] Prepare a PVB sheet (305mm long × 305mm wide × 380μm thick) (C1) as a gap-filling polymer sheet 30, with an opening (201mm long × 201mm wide) in the center (see reference). Figure 15 (a)).

[0241] Align them at the center of their length and width, according to Figure 14 The order recorded in (a) is used to stack the layers to obtain the stacked body.

[0242] Two release sheets were overlapped on both sides of the resulting laminate. Under conditions of 90°C and -900 mbar gauge pressure, heating and depressurization were performed via vacuum forming. Three PVB sheets were then integrated by hot pressing to obtain the interlayer film for laminated glass of Example 1, which internally embeds a PDLC film. It should be noted that EPDM rubber sheets were used as the release sheets for hot pressing. Furthermore, the surface roughness (Rm) of the interlayer film for laminated glass was measured. zjis94 The surface of the interlayer film for laminated glass is embossed in a manner with a thickness of 40 μm.

[0243] (Fabrication of laminated glass)

[0244] The intermediate film was sandwiched between two transparent glass plates (300mm long × 300mm wide × 2mm thick), and then integrated using an autoclave at 140°C, 10MPa (gauge pressure), and for 30 minutes to obtain the laminated glass of Example 1. The obtained laminated glass was evaluated based on the above evaluation criteria.

[0245] [Example 2]

[0246] Prepare 4 PVB sheets (253 mm long × 52 mm wide × 380 μm thick), arranged in a manner with an outer perimeter of 305 mm long and 305 mm wide, and an opening of 201 mm long × 201 mm wide (refer to...). Figure 15 (b)), a polymer sheet 30 (C1) for filling voids is obtained. Otherwise, the interlayer film and laminated glass of Example 2 are obtained in the same manner as in Example 1.

[0247] [Example 3]

[0248] Further prepare a PVB sheet (305mm long × 305mm wide × 200μm thick) (B3) as the third polymer sheet 50, according to... Figure 14 The interlayer and laminated glass of Example 3 are obtained in the same order as in Example 1, except that the interlayer and laminated glass are stacked in the same order as in Example 1.

[0249] [Example 4]

[0250] The surface roughness (R) of the interlayer film for laminated glasszjis94 The surface of the interlayer film for laminated glass is embossed in a manner with a thickness of 15 μm. Otherwise, the interlayer film for laminated glass and laminated glass of Example 4 are obtained in the same manner as in Example 1.

[0251] [Example 5]

[0252] A heat-reflective film (200 mm long × 200 mm wide × 110 μm thick) was prepared as a functional film 10, and a PVB sheet (305 mm long × 305 mm wide × 110 μm thick) (A1) was prepared as a polymer sheet 30 for gap filling. Otherwise, the interlayer film and laminated glass of Example 5 were obtained in the same manner as in Example 1.

[0253] [Example 6]

[0254] Further prepare an SPD film (200mm long × 200mm wide × 385μm thick) (A2) as the second functional film 10a, prepare a PVB sheet (305mm long × 305mm wide × 760μm thick) (C1) as the gap-filling polymer sheet 30, and prepare a PVB sheet (305mm long × 305mm wide × 380μm thick) (B3) as the third polymer sheet 20b, according to... Figure 14 The interlayer and laminated glass of Example 6 are obtained in the same order as in Example 1, except that the interlayer and laminated glass are stacked in the same order as in Example 1.

[0255] [Comparative Example 1]

[0256] Except for not using the gap-filling polymer sheet 30, the same procedure was followed as in Example 1 to obtain the interlayer film and laminated glass of Comparative Example 1 (see Example 1). Figure 14 (d)

[0257] [Comparative Example 2]

[0258] like Figure 14 As shown in (e), a first polymer sheet 20a, a second polymer sheet 40, and a gap-filling polymer sheet 30 are stacked, and otherwise, the interlayer film for laminated glass and laminated glass of Comparative Example 2 are obtained in the same manner as in Example 1.

[0259] The evaluation results are shown in Table 1.

[0260] [Table 1]

[0261]

[0262] In the interlayer films for laminated glass in Examples 1-6, since the gap-filling polymer sheet is disposed on the side of the first polymer sheet opposite to the functional film side, the generation of voids at the ends of the functional film can be suppressed. On the other hand, although the interlayer film for laminated glass in Comparative Example 1 can suppress the generation of voids at the ends of the functional film, it lacks a gap-filling polymer sheet, resulting in a height difference in the thickness direction. Furthermore, in the interlayer film for laminated glass in Comparative Example 2, the gap-filling polymer sheet is disposed on the functional film side of the first polymer sheet, therefore the generation of voids at the ends of the functional film cannot be suppressed.

[0263] Explanation of reference numerals in the attached figures

[0264] 1. Interlayer film for 1A~1K laminated glass

[0265] 10, 10a Functional Thin Films

[0266] 20a, 20b First polymer sheet

[0267] 20b, 30a~30d polymer sheets

[0268] 40 Second polymer sheet

[0269] 30, 30A, 30C~30G, 30I, 30J gap-filling polymer sheets

[0270] 50 Third polymer sheet

[0271] 60 and 70 glass plates

[0272] 80 polymer sheets

[0273] 100, 100A laminated glass

Claims

1. An interlayer for laminated glass, comprising a functional film and one or more first polymer sheets, the one or more first polymer sheets being provided on one side of the functional film, in a projected view in the thickness direction, the functional film is included in a region of the one or more first polymer sheets that is in contact with the functional film, the interlayer for laminated glass further comprises one or more gap filling polymer sheets, the one or more gap filling polymer sheets being provided on the side of the first polymer sheet opposite the functional film.

2. The interlayer for laminated glass according to claim 1, wherein The surface roughness (R) of the side surface of the polymer sheet used for gap filling zjis94 The size is greater than 1 μm and less than 100 μm.

3. The interlayer for laminated glass according to claim 1, further comprising a second polymer sheet provided on the other side of the functional film.

4. The interlayer for laminated glass according to claim 3, wherein The surface roughness (R) of the side surface of the second polymer sheet zjis94 The size is greater than 1 μm and less than 100 μm.

5. The interlayer for laminated glass according to claim 3, wherein in a projected view in the thickness direction, the distance between the outer periphery of the first polymer sheet and the outer periphery of the gap filling polymer sheet is 0 mm or more and 10 mm or less, in a projected view in the thickness direction, the distance between the outer periphery of the second polymer sheet and the outer periphery of the gap filling polymer sheet is 0 mm or more and 10 mm or less, in a projected view in the thickness direction, the distance between the outer periphery of the first polymer sheet and the outer periphery of the second polymer sheet is 0 mm or more and 10 mm or less.

6. The interlayer for laminated glass according to claim 1, wherein the gap filling polymer sheet has an opening in a region overlapping the functional film in a projected view in the thickness direction.

7. The interlayer for laminated glass according to claim 6, wherein the gap filling polymer sheet having the opening is composed of a plurality of polymer sheets arranged in a planar direction.

8. The interlayer for laminated glass according to claim 6, wherein in a projected view in the thickness direction, the distance between the inner periphery of the opening of the gap filling polymer sheet and the outer periphery of the functional film is 5 mm or less in the entire periphery.

9. The interlayer for laminated glass according to claim 1, wherein at least one of the first polymer sheet and the gap filling polymer sheet comprises at least one thermoplastic resin selected from the group consisting of polyvinyl acetal resin and ethylene-vinyl acetate copolymer resin.

10. The interlayer for laminated glass according to claim 1, wherein the functional film is a film having a function of absorbing or reflecting a specific light.

11. The interlayer for laminated glass according to claim 1, wherein the functional film comprises polyethylene terephthalate resin.

12. The interlayer for laminated glass according to claim 1, wherein the functional film is a P-polarized light reflecting film, a hologram film, a heat ray reflecting film, a light adjusting film, a display element film, a transparent conductive film, a touch sensor film, a circuit film, a solar power generation film, or an electrically controllable film.

13. The interlayer for laminated glass according to claim 3, wherein the second polymer sheet comprises at least one thermoplastic resin selected from the group consisting of polyvinyl acetal resin and ethylene-vinyl acetate copolymer resin.

14. The interlayer for laminated glass according to claim 1, further comprising a third polymer sheet provided on the side of the gap filling polymer sheet opposite the first polymer sheet.

15. The interlayer for laminated glass according to claim 3, wherein the side of the gap filling polymer sheet and the side of the second polymer sheet have regular or random shaped concavities and convexities.

16. The interlayer for laminated glass according to claim 3, wherein at least one of the side of the gap filling polymer sheet and the side of the second polymer sheet is protected by a protective release film.

17. The method of producing the interlayer for laminated glass according to any one of claims 1 to 16, comprising: A process of laminating the functional film, the first polymer sheet, and the gap filling polymer sheet in the order of the functional film, the first polymer sheet, and the gap filling polymer sheet.

18. A laminated glass comprising: a pair of glass sheets, and the interlayer film for a laminated glass according to any one of claims 1 to 16 disposed between the pair of glass sheets.

Images