Interlayer film for laminated glass and laminated glass

Abstract

Provided is an interlayer film for a laminated glass with which it is possible to obtain a laminated glass having high unity of appearance.　An interlayer film for a laminated glass according to the present invention has one end and another end. When a laminated glass X is obtained by placing the interlayer film between two panels of clear glass according to JIS R3202:1996, the interlayer film has a colored region where the visible light transmittance of the laminated glass X is 1 to 50%. Of the 100% total plane area of the interlayer film, the plane area of the colored region is greater than or equal to 95%. A first visible light transmittance of the laminated glass X at a location 5 cm from the one end toward the other end of the interlayer film is lower than a second visible light transmittance of the laminated glass X at a location 5 cm from the other end toward the one end of the interlayer film. The first visible light transmittance is 1 to 20%, the second visible light transmittance is 5 to 50%, and the absolute value of the difference between the first visible light transmittance and the second visible light transmittance is 2 to 45%.

Description

[Technical Field]

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

[0002] Laminated glass is known, in which an interlayer film for laminated glass is sandwiched between a pair of glass sheets. This laminated glass is widely used in automobiles, railway vehicles, aircraft, ships, buildings, and the like. In recent years, laminated glass with privacy protection properties has been demanded as laminated glass for buildings and automobiles. Laminated glass with privacy protection properties, for example, allows light to pass through, but there are areas where people or objects located behind the laminated glass cannot be seen.

[0003] As an example of laminated glass with privacy protection properties, Patent Document 1 below discloses laminated glass using a multilayer interlayer film with an opaque layer. In this laminated glass, privacy protection is achieved by the opaque layer that makes it impossible to see people or objects behind the laminated glass.

[0004] Patent Document 2 listed below discloses laminated glass using an interlayer film having a dark color portion, a gradation portion, and a transparent portion. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] WO2006 / 082800A1 [Patent Document 2] WO2014 / 077328A1 Summary of the Invention [Problem to be solved by the invention]

[0006] As the design technology for laminated glass has improved, the applications of laminated glass have become more diverse. Also, rear glass and roof glass are well known as laminated glass. Furthermore, a new example of laminated glass is expected to be a rear-roof integrated glass in which the rear glass and roof glass are integrated, or in which the rear glass and roof glass appear to be integrated.

[0007] In recent years, the design of roof glass, rear glass, and integrated rear roof glass has become more sophisticated.

[0008] However, the laminated glass described in Patent Document 1 has a problem in that the entire surface of the glass has the same color, resulting in poor aesthetic design.

[0009] The interlayer film described in Patent Document 2 has a gradation pattern, which can enhance the appearance design. However, with this interlayer film, the colored and uncolored regions are clearly distinguishable from each other, making it impossible to visually recognize the laminated glass as a single unit.

[0010] An object of the present invention is to provide an interlayer film for laminated glass that can provide laminated glass with excellent appearance integrity. Another object of the present invention is to provide laminated glass with excellent appearance integrity. [Means for solving the problem]

[0011] According to a broad aspect of the present invention, there is provided an interlayer film for laminated glass having one end and another end opposite to the one end, the interlayer film being formed in accordance with JIS An interlayer film for laminated glass (hereinafter sometimes referred to as interlayer film) is provided, in which, when the interlayer film is placed between two sheets of clear glass conforming to R3202:1996 to obtain a laminated glass X, the interlayer film has colored regions that have a visible light transmittance of the laminated glass X of 1% or more and 50% or less, the colored regions occupy 95% or more of the total planar area of ​​the interlayer film (100%), a first visible light transmittance of the laminated glass X at a position 5 cm from one end toward the other end of the interlayer film is smaller than a second visible light transmittance of the laminated glass X at a position 5 cm from the other end toward the one end of the interlayer film, the first visible light transmittance is 1% or more and 20% or less, the second visible light transmittance is 5% or more and 50% or less, and the absolute value of the difference between the first visible light transmittance and the second visible light transmittance is 2% or more and 45% or less.

[0012] In a specific aspect of the interlayer film according to the present invention, the planar area of ​​the colored region is 100% of the total planar area of ​​the interlayer film.

[0013] In a specific aspect of the interlayer film according to the present invention, the maximum absolute value of the rate of change in visible light transmittance of the laminated glass X in the colored region from the one end side to the other end side of the interlayer film is 4.5% / mm or less.

[0014] In a specific aspect of the interlayer film according to the present invention, the colored region includes a first non-gradation region in which the visible light transmittance of the laminated glass X is uniform from the one end side to the other end side of the interlayer film, and a second non-gradation region in which the visible light transmittance of the laminated glass X is uniform from the one end side to the other end side of the interlayer film, and the first non-gradation region is located closer to the one end than the second non-gradation region.

[0015] In a specific aspect of the interlayer film according to the present invention, the weight ratio of the total content of the colorant contained in each layer of the interlayer film constituting the second non-gradation region to the total content of the colorant contained in each layer of the interlayer film constituting the first non-gradation region is 0.15 or more and 0.95 or less.

[0016] In a specific aspect of the interlayer film according to the present invention, the colored region has a gradation region in which the visible light transmittance of the laminated glass X increases from the one end side to the other end side of the interlayer film, and the first non-gradation region is located closer to the one end than the gradation region, and the second non-gradation region is located closer to the other end than the gradation region.

[0017] In a specific aspect of the interlayer film according to the present invention, the colored region has only a gradation region in which the visible light transmittance of the laminated glass X increases from the one end side to the other end side of the interlayer film.

[0018] In a specific aspect of the interlayer film according to the present invention, at least one layer of the interlayer film that constitutes the colored region contains heat-shielding particles.

[0019] In a particular aspect of the interlayer film according to the present invention, it is used in a rear glass, a roof glass, or a rear-roof integrated glass.

[0020] According to a broad aspect of the present invention, there is provided laminated glass comprising a first laminated glass element, a second laminated glass element, and the above-described interlayer film for laminated glass, with the interlayer film for laminated glass disposed between the first laminated glass element and the second laminated glass element.

[0021] According to a broad aspect of the present invention, there is provided a laminated glass having one end and another end opposite the one end, the laminated glass comprising a first laminated glass element, a second laminated glass element, and an interlayer film, the interlayer film being disposed between the first laminated glass element and the second laminated glass element, the laminated glass having a colored region with a visible light transmittance of 1% or more and 50% or less, the colored region occupying 95% or more of a total planar area of ​​100% of the laminated glass, a first visible light transmittance at a position 5 cm from the one end toward the other end being smaller than a second visible light transmittance at a position 5 cm from the other end toward the one end, the first visible light transmittance being 1% or more and 20% or less, the second visible light transmittance being 5% or more and 50% or less, and the absolute value of the difference between the first visible light transmittance and the second visible light transmittance being 2% or more and 45% or less.

[0022] In a specific aspect of the laminated glass according to the present invention, the planar area of ​​the colored region is 100% of the total planar area of ​​the laminated glass.

[0023] In a specific aspect of the laminated glass according to the present invention, the maximum absolute value of the rate of change in visible light transmittance in the colored region from the one end side to the other end side is 4.5% / mm or less.

[0024] In a specific aspect of the laminated glass according to the present invention, the colored region has a first non-gradation region having a uniform visible light transmittance from the one end side to the other end side, and a second non-gradation region having a uniform visible light transmittance from the one end side to the other end side, and the first non-gradation region is located closer to the one end side than the second non-gradation region.

[0025] In a specific aspect of the laminated glass of the present invention, the colored region has a gradation region in which the visible light transmittance increases from the one end side to the other end side, the first non-gradation region is located closer to the one end than the gradation region, and the second non-gradation region is located closer to the other end than the gradation region.

[0026] In a specific aspect of the laminated glass according to the present invention, the colored region has only a gradation region in which the visible light transmittance increases from the one end side to the other end side. [Effects of the Invention]

[0027] The interlayer film for laminated glass according to the present invention can provide laminated glass with excellent appearance integrity. The laminated glass according to the present invention has excellent appearance integrity. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a cross-sectional view schematically illustrating an interlayer film for laminated glass according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view that schematically shows laminated glass using the interlayer film for laminated glass shown in FIG. [Figure 3] FIG. 3 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a second embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional view that schematically shows laminated glass using the interlayer film for laminated glass shown in FIG. [Figure 5] FIG. 5 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a third embodiment of the present invention. [Figure 6] FIG. 6 is a cross-sectional view that schematically shows laminated glass using the interlayer film for laminated glass shown in FIG. [Figure 7] FIG. 7 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a fourth embodiment of the present invention. [Figure 8] FIG. 8 is a cross-sectional view that schematically shows laminated glass using the interlayer film for laminated glass shown in FIG. [Figure 9] FIG. 9 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a fifth embodiment of the present invention. [Figure 10] FIG. 10 is a cross-sectional view that schematically shows laminated glass using the interlayer film for laminated glass shown in FIG. [Figure 11] FIG. 11 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a sixth embodiment of the present invention. [Figure 12] FIG. 12 is a cross-sectional view that schematically shows laminated glass using the interlayer film for laminated glass shown in FIG. [Figure 13] FIG. 13 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a seventh embodiment of the present invention. [Figure 14] FIG. 14 is a cross-sectional view that schematically shows laminated glass using the interlayer film for laminated glass shown in FIG. [Figure 15] FIG. 15 is a cross-sectional view schematically showing an interlayer film for laminated glass according to an eighth embodiment of the present invention. [Figure 16] FIG. 16 is a cross-sectional view that schematically shows laminated glass using the interlayer film for laminated glass shown in FIG. [Figure 17] FIG. 17 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a ninth embodiment of the present invention. [Figure 18] FIG. 18 is a cross-sectional view that schematically shows laminated glass using the interlayer film for laminated glass shown in FIG. [Figure 19] FIG. 19 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a tenth embodiment of the present invention. [Figure 20] FIG. 20 is a cross-sectional view that schematically shows laminated glass using the interlayer film for laminated glass shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0029] The present invention will be described in detail below.

[0030] The interlayer film for laminated glass according to the present invention (hereinafter sometimes referred to as interlayer film) has one end and another end opposite the one end. When the interlayer film according to the present invention is placed between two sheets of clear glass conforming to JIS R3202:1996 to obtain laminated glass X, the interlayer film has a colored region in which the visible light transmittance of the laminated glass X is 1% or more and 50% or less, and the planar area of ​​the colored region accounts for 95% or more of the total planar area of ​​the interlayer film (100%). In the interlayer film according to the present invention, the first visible light transmittance of the laminated glass X at a position 5 cm from the one end toward the other end of the interlayer film is smaller than the second visible light transmittance of the laminated glass X at a position 5 cm from the other end toward the one end of the interlayer film. In the interlayer film according to the present invention, the first visible light transmittance is 1% or more and 20% or less, the second visible light transmittance is 5% or more and 50% or less, and the absolute value of the difference between the first visible light transmittance and the second visible light transmittance is 2% or more and 45% or less.

[0031] The interlayer film according to the present invention has the above-described features, making it possible to obtain laminated glass with excellent appearance integrity. Furthermore, the interlayer film according to the present invention has the above-described features, making it possible to obtain laminated glass with excellent appearance design.

[0032] The laminated glass according to the present invention has one end and another end opposite to the one end. The laminated glass according to the present invention includes a first laminated glass member, a second laminated glass member, and an interlayer film (interlayer film for laminated glass), with the interlayer film being disposed between the first laminated glass member and the second laminated glass member. The laminated glass according to the present invention has a colored region having a visible light transmittance of 1% or more and 50% or less, and the colored region accounts for 95% or more of the total planar area of ​​the laminated glass (100%). In the laminated glass according to the present invention, the first visible light transmittance at a position 5 cm from the one end toward the other end is smaller than the second visible light transmittance at a position 5 cm from the other end toward the one end. In the laminated glass according to the present invention, the first visible light transmittance is 1% or more and 20% or less, the second visible light transmittance is 5% or more and 50% or less, and the absolute value of the difference between the first visible light transmittance and the second visible light transmittance is 2% or more and 45% or less.

[0033] The laminated glass according to the present invention has the above-described structure and is therefore excellent in appearance integrity.Furthermore, the laminated glass according to the present invention has the above-described structure and is therefore excellent in appearance design.

[0034] In the present invention, the visible light transmittance of laminated glass X produced using the interlayer film of the present invention and of laminated glass of the present invention (hereinafter sometimes referred to as laminated glass Y (or sometimes referred to as laminated glass)) is measured. The laminated glass X is produced in order to measure the visible light transmittance. With the interlayer film of the present invention, laminated glass may be produced using laminated glass components other than two clear glass sheets conforming to JIS R3202:1996, or laminated glass may be produced using laminated glass components other than clear glass.

[0035] The visible light transmittance of the laminated glass X and the laminated glass Y according to the present invention can be determined by measuring the transmittance of the laminated glasses X and Y at wavelengths of 380 nm to 780 nm using a spectrophotometer (for example, Hitachi High-Tech U-4100) in accordance with JIS R3106:1998 or JIS R3212:1998.

[0036] The laminated glass X is produced by placing the interlayer film between two sheets of clear glass conforming to JIS R3202:1996. The laminated glass X is produced for measuring the visible light transmittance. The laminated glass X is preferably produced as follows.

[0037] A laminate is obtained by sandwiching an interlayer between two 2mm-thick clear glass sheets conforming to JIS R3202:1996. The resulting laminate is placed in a rubber bag and degassed at a vacuum of 2.6 kPa for 20 minutes. The degassed laminate is then transferred to an oven and held at 90°C for 30 minutes for vacuum pressing to pre-bond the laminate. The pre-bonded laminate is then compressed in an autoclave for 20 minutes at 135°C and a pressure of 1.2 MPa to obtain laminated glass X.

[0038] The interlayer film according to the present invention has a colored region that has a visible light transmittance of 1% or more and 50% or less of the laminated glass X. The colored region accounts for 95% or more of the total planar area of ​​the interlayer film (100%).

[0039] The laminated glass Y according to the present invention has a colored region having a visible light transmittance of 1% to 50%. The colored region accounts for 95% or more of the total area of ​​the laminated glass Y (100%).

[0040] Of the total planar area (100%) of the interlayer film or of the laminated glass Y, the planar area of ​​the colored region is preferably 96% or more, more preferably 97% or more, even more preferably 98% or more, and particularly preferably 99% or more. Of the total planar area (100%) of the interlayer film or of the laminated glass Y, the planar area of ​​the colored region may be 100% or less, and is most preferably 100%. When the planar area of ​​the colored region is at least the above lower limit, the appearance design and privacy protection can be further improved.

[0041] In the interlayer film according to the present invention, the first visible light transmittance of the laminated glass X at a position 5 cm from the one end toward the other end of the interlayer film is smaller than the second visible light transmittance of the laminated glass X at a position 5 cm from the other end toward the one end of the interlayer film.

[0042] In the laminated glass Y according to the present invention, the first visible light transmittance at a position 5 cm from the one end toward the other end of the laminated glass Y is smaller than the second visible light transmittance at a position 5 cm from the other end toward the one end of the laminated glass Y.

[0043] In the laminated glass Y, the laminated glass members may have black ceramic around the entire periphery or a portion of the periphery. In this case, the visible light transmittance at a position 5 cm from the boundary between the black ceramic and non-black ceramic toward the non-black ceramic (a position 5 cm from one end of the laminated glass Y toward the other end or from the other end toward the one end) can be defined as the first or second visible light transmittance.

[0044] In the interlayer film and laminated glass Y according to the present invention, the first visible light transmittance is 1% or more and 20% or less, the second visible light transmittance is 5% or more and 50% or less, and the absolute value of the difference between the first visible light transmittance and the second visible light transmittance is 2% or more and 45% or less.

[0045] The first visible light transmittance is preferably 2% or more, more preferably 3% or more, and is preferably 15% or less, more preferably 10% or less, even more preferably 8% or less, and particularly preferably 6% or less. When the first visible light transmittance is equal to or more than the lower limit and equal to or less than the upper limit, privacy protection can be further improved.

[0046] The second visible light transmittance is preferably 10% or more, more preferably 15% or more, even more preferably 18% or more, and is preferably 45% or less, more preferably 35% or less, even more preferably 30% or less, and particularly preferably 25% or less. When the second visible light transmittance is equal to or more than the lower limit and equal to or less than the upper limit, privacy protection can be further improved.

[0047] The absolute value of the difference between the first visible light transmittance and the second visible light transmittance is preferably 3% or more, more preferably 4% or more, and is preferably 44% or less, more preferably 30% or less, even more preferably 25% or less, and particularly preferably 17% or less. When the absolute value of the difference is equal to or greater than the above lower limit and equal to or less than the above upper limit, the integrity of the appearance of the laminated glass can be further improved.

[0048] The maximum absolute value of the rate of change in visible light transmittance of the laminated glass X in the colored region from one end to the other end of the interlayer film is defined as maximum value (1). The maximum absolute value of the rate of change in visible light transmittance of the laminated glass Y in the colored region from one end to the other end is defined as maximum value (2). Maximum values ​​(1) and (2) are each preferably 4.5% / mm or less, more preferably 3% / mm or less, and even more preferably 2% / mm or less. When maximum values ​​(1) and (2) are equal to or less than the upper limit, the appearance integrity of the laminated glass can be further improved. Note that maximum values ​​(1) and (2) may each be 0.02% / mm or more, 0.2% / mm or more, or 1.0% / mm or more.

[0049] In the interlayer film, the colored region preferably has a non-gradation region in which the visible light transmittance of the laminated glass X is uniform from the one end side to the other end side of the interlayer film.

[0050] In the interlayer film, the colored region preferably has a first non-gradation region in which the visible light transmittance of the laminated glass X is uniform from one end side to the other end side of the interlayer film, and a second non-gradation region in which the visible light transmittance of the laminated glass X is uniform from one end side to the other end side of the interlayer film. In this case, the first non-gradation region is located closer to one end side of the interlayer film than the second non-gradation region. In this case, the appearance unity and appearance design can be further improved.

[0051] From the viewpoint of further enhancing the appearance design, it is preferable that the colored region of the interlayer film has a gradation region in which the visible light transmittance of the laminated glass X increases from the one end side to the other end side of the interlayer film.

[0052] In the laminated glass Y, the colored region preferably has a non-gradation region in which the visible light transmittance is uniform from the one end side of the laminated glass Y to the other end side.

[0053] In the laminated glass Y, the colored region preferably has a first non-gradation region having a uniform visible light transmittance from one end to the other end of the laminated glass Y, and a second non-gradation region having a uniform visible light transmittance from one end to the other end of the laminated glass Y. In this case, the first non-gradation region is located closer to one end of the laminated glass than the second non-gradation region. This can further improve the integrity of the appearance and the appearance design.

[0054] From the viewpoint of further enhancing the appearance design, it is preferable that the colored region of the laminated glass Y has a gradation region in which the visible light transmittance increases from the one end side of the laminated glass Y to the other end side.

[0055] Note that "uniform visible light transmittance" in the non-gradation regions (first and second non-gradation regions) means that the visible light transmittance does not change at all or that the absolute value of the rate of change in visible light transmittance from one end to the other end is less than 0.02% / mm. Also, the gradation region means that the absolute value of the rate of change in visible light transmittance increases by 0.02% / mm or more from one end to the other end.

[0056] In the interlayer film and the laminated glass Y, the colored region may have a non-gradation region on one end side and a gradation region on the other end side.In the interlayer film and the laminated glass Y, the colored region may have a gradation region on one end side and a non-gradation region on the other end side.

[0057] In the interlayer film and the laminated glass Y, the colored region does not have to have a gradation region, or may have only a gradation region. In the interlayer film and the laminated glass Y, the colored region does not have to have a non-gradation region. When the colored region has only a gradation region, the appearance unity and appearance design can be further improved. In the interlayer film and the laminated glass Y, the colored region may have only a non-gradation region.

[0058] Of the total planar area of ​​the interlayer film or the total planar area of ​​the laminated glass Y, the planar area of ​​the non-gradation region is preferably 20% or more, more preferably 30% or more, even more preferably 40% or more, and preferably 99% or less, more preferably 95% or less, and even more preferably 90% or less. When the planar area of ​​the non-gradation region is equal to or greater than the above-mentioned lower limit and equal to or less than the above-mentioned upper limit, the unity of appearance, the appearance design, and privacy protection can be further improved. Note that, when the non-gradation region has the first non-gradation region and the second non-gradation region, the planar area of ​​the non-gradation region refers to the sum of the planar area of ​​the first non-gradation region and the planar area of ​​the second non-gradation region. Of the total planar area of ​​the interlayer film or the total planar area of ​​the laminated glass Y, the planar area of ​​the non-gradation region may be 0% or more, 100% or less, or even 100%.

[0059] Of the total planar area (100%) of the interlayer film or of the laminated glass Y, the planar area of ​​the first non-gradation region is preferably 5% or more, more preferably 25% or more, even more preferably 45% or more, and is preferably 80% or less, more preferably 70% or less, and even more preferably 60% or less. When the planar area of ​​the first non-gradation region is equal to or greater than the above lower limit and equal to or less than the above upper limit, the appearance unity, appearance design, and privacy protection can be further improved.

[0060] Of the total planar area (100%) of the interlayer film or of the laminated glass Y, the planar area of ​​the second non-gradation region is preferably 10% or more, more preferably 20% or more, even more preferably 30% or more, and is preferably 70% or less, more preferably 60% or less, and even more preferably 50% or less. When the planar area of ​​the second non-gradation region is equal to or greater than the above lower limit and equal to or less than the above upper limit, the appearance unity, appearance design, and privacy protection can be further improved.

[0061] Of the total planar area of ​​the interlayer film (100%) or the total planar area of ​​the laminated glass Y (100%), the planar area of ​​the gradation region is preferably 0.5% or more, more preferably 1% or more, even more preferably 5% or more, and is preferably 75% or less, more preferably 50% or less, even more preferably 25% or less. When the planar area of ​​the gradation region is equal to or greater than the above lower limit and equal to or less than the above upper limit, the unity of appearance, the appearance design, and privacy protection can be further improved. Note that, of the total planar area of ​​the interlayer film (100%) or the total planar area of ​​the laminated glass Y (100%), the planar area of ​​the gradation region may be 100% or less, or may be 100%.

[0062] Of the total planar area (100%) of the interlayer film or of the laminated glass Y, the sum of the planar area of ​​the first non-gradation region and the planar area of ​​the gradation region is preferably 30% or more, more preferably 40% or more, even more preferably 50% or more, and is preferably 85% or less, more preferably 75% or less, even more preferably 65% ​​or less. When this sum is equal to or greater than the above lower limit and equal to or less than the above upper limit, the appearance unity, appearance design, and privacy protection can be further improved.

[0063] Specific embodiments of the present invention will be described below with reference to the drawings. The sizes and dimensions of the interlayer film and laminated glass in the drawings described below have been appropriately modified from their actual sizes and shapes for the sake of convenience. In the drawings described below, different parts can be interchanged. In the drawings described below, parts that may have similar configurations may be designated by the same reference numerals.

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

[0065] 1 is a cross-sectional view taken along the thickness direction of the intermediate film 11. The intermediate film 11 has one end 11a and the other end 11b. The one end 11a and the other end 11b are opposite ends on both sides.

[0066] The interlayer film 11 comprises a first layer 1 containing a colorant and a second layer 2 containing a colorant. The second layer 2 extends to one end 11a of the interlayer film 11. The second layer 2 does not extend to the other end 11b of the interlayer film 11. The one end 11a of the interlayer film 11 is composed of the first layer 1 and the second layer 2. The other end 11b of the interlayer film 11 is composed of the first layer 1.

[0067] The first layer 1 is disposed on both surface sides of the second layer 2. The second layer 2 is embedded in the first layer 1. The first layer 1 is a surface layer of the interlayer film 11. The second layer 2 is an intermediate layer of the interlayer film 11.

[0068] The second layer 2 has a gradation portion 2X where the visible light transmittance increases from one end 11a of the intermediate film 11 toward the other end 11b. The second layer 2 has a non-gradation portion 2Y on the one end 11a of the intermediate film 11. The second layer 2 reaches one end 11a of the intermediate film 11 at the non-gradation portion 2Y. The gradation portion 2X is a portion where the thickness of the second layer 2 decreases from one end 11a of the intermediate film 11 toward the other end 11b. The non-gradation portion 2Y is a portion where the thickness of the second layer 2 is uniform.

[0069] In the interlayer film 11, the region from one end 11a to the other end 11b is the colored region R. The colored region R has a first non-gradation region RY, a gradation region RX, and a second non-gradation region RZ. The first non-gradation region RY is located closer to the one end 11a than the gradation region RX, and the second non-gradation region RZ is located closer to the other end 11b than the gradation region RX. The colored region R, first non-gradation region RY, gradation region RX, and second non-gradation region RZ are each determined by producing the above-mentioned laminated glass X and measuring the visible light transmittance of the laminated glass X.

[0070] The first non-gradation region RY of the interlayer 11 is a region in the thickness direction of the interlayer 11 where the first layer 1 and the non-gradation portion 2Y of the second layer 2 exist. The gradation region RX of the interlayer 11 is a region in the thickness direction of the interlayer 11 where the first layer 1 and the gradation portion 2X of the second layer 2 exist. The second non-gradation region RZ of the interlayer 11 is a region in the thickness direction of the interlayer 11 where only the first layer 1 exists. The second non-gradation region RZ of the interlayer 11 is a region in the thickness direction of the interlayer 11 where the second layer 2 does not exist.

[0071] 2 is a cross-sectional view taken along the thickness direction of laminated glass 31. The laminated glass 31 includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11. The interlayer film 11 is disposed between the first laminated glass member 21 and the second laminated glass member 22. The first laminated glass member 21 is disposed and laminated on a first surface side of the interlayer film 11. The second laminated glass member 22 is disposed and laminated on a second surface side of the interlayer film 11 opposite the first surface.

[0072] The laminated glass 31 has one end 31a and the other end 31b. The one end 31a and the other end 31b are opposite ends. In the laminated glass 31, the region from the one end 31a to the other end 31b is the colored region R. The colored region R has a first non-gradation region RY, a gradation region RX, and a second non-gradation region RZ. The first non-gradation region RY is located closer to the one end 31a than the gradation region RX, and the second non-gradation region RZ is located closer to the other end 31b than the gradation region RX.

[0073] The first non-gradation region RY of the laminated glass 31 is a region in the thickness direction of the laminated glass 31 where the first laminated glass member 21, the second laminated glass member 22, the first layer 1, and the non-gradation portion 2Y of the second layer 2 are present. The gradation region RX of the laminated glass 31 is a region in the thickness direction of the laminated glass 31 where the first laminated glass member 21, the second laminated glass member 22, the first layer 1, and the gradation portion 2X of the second layer 2 are present. The second non-gradation region RZ of the laminated glass 31 is a region in the thickness direction of the laminated glass 31 where the first laminated glass member 21, the second laminated glass member 22, and the first layer 1 are present. The second non-gradation region RZ of the laminated glass 31 is a region in the thickness direction of the laminated glass 31 where the second layer 2 is not present.

[0074] Fig. 3 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a second embodiment of the present invention, and Fig. 4 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 3.

[0075] 3 is a cross-sectional view of the intermediate film 11A along the thickness direction. The intermediate film 11A has one end 11Aa and the other end 11Ab. The one end 11Aa and the other end 11Ab are end portions on both sides that face each other.

[0076] The interlayer film 11A includes a first layer 1A containing a colorant, a second layer 2A containing a colorant, a third layer 3A containing a colorant, and a fourth layer 4A not containing a colorant. The second layer 2A extends to one end 11Aa of the interlayer film 11A. The second layer 2A does not extend to the other end 11Ab of the interlayer film 11A. The one end 11Aa of the interlayer film 11A is composed of the first layer 1A, the second layer 2A, the third layer 3A, and the fourth layer 4A. The other end 11Ab of the interlayer film 11A is composed of the first layer 1A, the third layer 3A, and the fourth layer 4A.

[0077] The first layer 1A is disposed on both surface sides of the second layer 2A. The second layer 2A is embedded in the first layer 1A. The first layer 1A is a surface layer of the interlayer film 11A. The second layer 2A is an intermediate layer of the interlayer film 11A.

[0078] The third layer 3A is disposed on the surface of the fourth layer 4A opposite to the first layer 1A and is laminated therewith. The fourth layer 4A is disposed on the surface of the first layer 1A opposite to the second layer 2A and is laminated therewith. The third layer 3A is a surface layer of the interlayer film 11A. The fourth layer 4A is a middle layer of the interlayer film 11A. The fourth layer 4A is a sound-insulating layer.

[0079] The second layer 2A has a gradation portion 2AX where the visible light transmittance increases from one end 11Aa of the intermediate film 11A toward the other end 11Ab. The second layer 2A has a non-gradation portion 2AY on the one end 11Aa of the intermediate film 11A. The second layer 2A reaches the one end 11Aa of the intermediate film 11A at the non-gradation portion 2AY. The gradation portion 2AX is a portion where the thickness of the second layer 2A decreases from one end 11Aa of the intermediate film 11A toward the other end 11Ab. The non-gradation portion 2AY is a portion where the thickness of the second layer 2A is uniform.

[0080] In the interlayer film 11A, the region from one end 11Aa to the other end 11Ab is the colored region R. The colored region R has a first non-gradation region RY, a gradation region RX, and a second non-gradation region RZ. The first non-gradation region RY is located closer to the one end 11Aa than the gradation region RX, and the second non-gradation region RZ is located closer to the other end 11Ab than the gradation region RX. The colored region R, first non-gradation region RY, gradation region RX, and second non-gradation region RZ are each determined by producing the above-mentioned laminated glass X and measuring the visible light transmittance of the laminated glass X.

[0081] The first non-gradation region RY of the interlayer 11A is a region in the thickness direction of the interlayer 11A where the first layer 1A, the non-gradation portion 2AY of the second layer 2A, the third layer 3A, and the fourth layer 4A exist. The gradation region RX of the interlayer 11A is a region in the thickness direction of the interlayer 11A where the first layer 1A, the gradation portion 2AX of the second layer 2A, the third layer 3A, and the fourth layer 4A exist. The second non-gradation region RZ of the interlayer 11A is a region in the thickness direction of the interlayer 11A where the first layer 1A, the third layer 3A, and the fourth layer 4A exist. The second non-gradation region RZ of the interlayer 11A is a region in the thickness direction of the interlayer 11A where the second layer 2A does not exist.

[0082] 4 is a cross-sectional view of laminated glass 31A taken along the thickness direction. The laminated glass 31A includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11A. The interlayer film 11A is disposed between the first laminated glass member 21 and the second laminated glass member 22. The first laminated glass member 21 is disposed and laminated on a first surface side of the interlayer film 11A. The second laminated glass member 22 is disposed and laminated on a second surface side of the interlayer film 11A opposite to the first surface.

[0083] The laminated glass 31A has one end 31Aa and the other end 31Ab. The one end 31Aa and the other end 31Ab are opposite ends. In the laminated glass 31A, the region from the one end 31Aa to the other end 31Ab is a colored region R. The colored region R has a first non-gradation region RY, a gradation region RX, and a second non-gradation region RZ. The first non-gradation region RY is located closer to the one end 31Aa than the gradation region RX, and the second non-gradation region RZ is located closer to the other end 31Ab than the gradation region RX.

[0084] The first non-gradation region RY of the laminated glass 31A is a region in the thickness direction of the laminated glass 31A where the first laminated glass member 21, the second laminated glass member 22, the first layer 1A, the non-gradation portion 2AY of the second layer 2A, the third layer 3A, and the fourth layer 4A are present. The gradation region RX of the laminated glass 31A is a region in the thickness direction of the laminated glass 31A where the first laminated glass member 21, the second laminated glass member 22, the first layer 1A, the gradation portion 2AX of the second layer 2A, the third layer 3A, and the fourth layer 4A are present. The second non-gradation region RZ of the laminated glass 31A is a region in the thickness direction of the laminated glass 31A where the first laminated glass member 21, the second laminated glass member 22, the first layer 1A, the third layer 3A, and the fourth layer 4A are present. The second non-gradation region RZ of the laminated glass 31A is a region in the thickness direction of the laminated glass 31A where the second layer 2A does not exist.

[0085] Fig. 5 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a third embodiment of the present invention, and Fig. 6 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 5.

[0086] 5 is a cross-sectional view of the intermediate film 11B along the thickness direction. The intermediate film 11B has one end 11Ba and the other end 11Bb. The one end 11Ba and the other end 11Bb are end portions on both sides that face each other.

[0087] The interlayer film 11B includes a first layer 1B containing a colorant, a second layer 2B containing a colorant, a third layer 3B containing a colorant, and a fourth layer 4B not containing a colorant. The second layer 2B extends to one end 11Ba of the interlayer film 11B. The second layer 2B does not extend to the other end 11Bb of the interlayer film 11B. The one end 11Ba of the interlayer film 11B is composed of the first layer 1B, the second layer 2B, the third layer 3B, and the fourth layer 4B. The other end 11Bb of the interlayer film 11B is composed of the first layer 1B, the third layer 3B, and the fourth layer 4B.

[0088] The first layer 1B is disposed on one surface side of the second layer 2B. The fourth layer 4B is disposed on the other surface side of the second layer 2B. The second layer 2B is embedded between the first layer 1B and the fourth layer 4B. The first layer 1B is a surface layer of the interlayer film 11B. The second layer 2B is a middle layer of the interlayer film 11B.

[0089] The third layer 3B is disposed on the surface of the fourth layer 4B opposite to the first layer 1B and is laminated thereon. The fourth layer 4B is disposed on the surface of the second layer 2B opposite to the first layer 1B and is laminated thereon. The fourth layer 4B is also disposed on the surface of the first layer 1B and is laminated thereon. The third layer 3B is a surface layer of the interlayer film 11B. The fourth layer 4B is an intermediate layer of the interlayer film 11B. The fourth layer 4B is a sound-insulating layer.

[0090] The second layer 2B has a gradation portion 2BX where the visible light transmittance increases from one end 11Ba of the intermediate film 11B toward the other end 11Bb. The second layer 2B has a non-gradation portion 2BY on the one end 11Ba of the intermediate film 11B. The second layer 2B reaches the one end 11Ba of the intermediate film 11B at the non-gradation portion 2BY. The gradation portion 2BX is a portion where the thickness of the second layer 2B decreases from one end 11Ba of the intermediate film 11B toward the other end 11Bb. The non-gradation portion 2BY is a portion where the thickness of the second layer 2B is uniform.

[0091] In the interlayer film 11B, the region from one end 11Ba to the other end 11Bb is the colored region R. The colored region R has a first non-gradation region RY, a gradation region RX, and a second non-gradation region RZ. The first non-gradation region RY is located closer to the one end 11Ba than the gradation region RX, and the second non-gradation region RZ is located closer to the other end 11Bb than the gradation region RX. The colored region R, first non-gradation region RY, gradation region RX, and second non-gradation region RZ are each determined by producing the above-mentioned laminated glass X and measuring the visible light transmittance of the laminated glass X.

[0092] The first non-gradation region RY of the interlayer 11B is a region in the thickness direction of the interlayer 11B where the first layer 1B, the non-gradation portion 2BY of the second layer 2B, the third layer 3B, and the fourth layer 4B are present. The gradation region RX of the interlayer 11B is a region in the thickness direction of the interlayer 11B where the first layer 1B, the gradation portion 2BX of the second layer 2B, the third layer 3B, and the fourth layer 4B are present. The second non-gradation region RZ of the interlayer 11B is a region in the thickness direction of the interlayer 11B where the first layer 1B, the third layer 3B, and the fourth layer 4B are present. The second non-gradation region RZ of the interlayer 11B is a region in the thickness direction of the interlayer 11B where the second layer 2B is not present.

[0093] 6 is a cross-sectional view of laminated glass 31B along the thickness direction. The laminated glass 31B includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11B. The interlayer film 11B is disposed between the first laminated glass member 21 and the second laminated glass member 22. The first laminated glass member 21 is disposed and laminated on a first surface side of the interlayer film 11B. The second laminated glass member 22 is disposed and laminated on a second surface side of the interlayer film 11B opposite the first surface.

[0094] The laminated glass 31B has one end 31Ba and the other end 31Bb. The one end 31Ba and the other end 31Bb are opposite ends. In the laminated glass 31B, the region from the one end 31Ba to the other end 31Bb is a colored region R. The colored region R has a first non-gradation region RY, a gradation region RX, and a second non-gradation region RZ. The first non-gradation region RY is located closer to the one end 31Ba than the gradation region RX, and the second non-gradation region RZ is located closer to the other end 31Bb than the gradation region RX.

[0095] The first non-gradation region RY of the laminated glass 31B is a region in the thickness direction of the laminated glass 31B where the first laminated glass member 21, the second laminated glass member 22, the first layer 1B, the non-gradation portion 2BY of the second layer 2B, the third layer 3B, and the fourth layer 4B are present. The gradation region RX of the laminated glass 31B is a region in the thickness direction of the laminated glass 31B where the first laminated glass member 21, the second laminated glass member 22, the first layer 1B, the gradation portion 2BX of the second layer 2B, the third layer 3B, and the fourth layer 4B are present. The second non-gradation region RZ of the laminated glass 31B is a region in the thickness direction of the laminated glass 31B where the first laminated glass member 21, the second laminated glass member 22, the first layer 1B, the third layer 3B, and the fourth layer 4B are present. The second non-gradation region RZ of the laminated glass 31B is a region in the thickness direction of the laminated glass 31B where the second layer 2B does not exist.

[0096] Fig. 7 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a fourth embodiment of the present invention, and Fig. 8 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 7.

[0097] 7 is a cross-sectional view of the intermediate film 11C taken along the thickness direction. The intermediate film 11C has one end 11Ca and the other end 11Cb. The one end 11Ca and the other end 11Cb are opposite ends.

[0098] The interlayer film 11C includes a first layer 1C containing a colorant and a second layer 2C containing a colorant. The second layer 2C extends to one end 11Ca of the interlayer film 11C. The second layer 2C does not extend to the other end 11Cb of the interlayer film 11C. The one end 11Ca portion of the interlayer film 11C is composed of the first layer 1C and the second layer 2C. The other end 11Cb portion of the interlayer film 11C is composed of the first layer 1C.

[0099] A first layer 1C is disposed on both surface sides of the second layer 2C. A second layer 2C is embedded in the first layer 1C. The first layer 1C is a surface layer of the interlayer film 11C. The second layer 2C is an intermediate layer of the interlayer film 11C.

[0100] The second layer 2C has only a non-gradation portion 2CY, which is a portion of the second layer 2C where the thickness is uniform.

[0101] In the interlayer film 11C, the region from one end 11Ca to the other end 11Cb is the colored region R. The colored region R has a first non-gradation region RY and a second non-gradation region RZ. The first non-gradation region RY is located closer to the one end 11Ca than the second non-gradation region RZ. The colored region R, the first non-gradation region RY, and the second non-gradation region RZ are each determined by producing the above-mentioned laminated glass X and measuring the visible light transmittance of the laminated glass X.

[0102] The first non-gradation region RY of the interlayer 11C is a region in the thickness direction of the interlayer 11C where the first layer 1C and the non-gradation portion 2CY of the second layer 2C exist. The second non-gradation region RZ of the interlayer 11C is a region in the thickness direction of the interlayer 11C where only the first layer 1C exists. The second non-gradation region RZ of the interlayer 11C is a region in the thickness direction of the interlayer 11C where the second layer 2C does not exist.

[0103] 8 is a cross-sectional view of laminated glass 31C taken along the thickness direction. The laminated glass 31C includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11C. The interlayer film 11C is disposed between the first laminated glass member 21 and the second laminated glass member 22. The first laminated glass member 21 is disposed and laminated on a first surface side of the interlayer film 11C. The second laminated glass member 22 is disposed and laminated on a second surface side of the interlayer film 11C opposite the first surface.

[0104] The laminated glass 31C has one end 31Ca and the other end 31Cb. The one end 31Ca and the other end 31Cb are opposite ends. In the laminated glass 31C, the region from the one end 31Ca to the other end 31Cb is a colored region R. The colored region R has a first non-gradation region RY and a second non-gradation region RZ. The first non-gradation region RY is located closer to the one end 31Ca than the second non-gradation region RZ.

[0105] The first non-gradation region RY of the laminated glass 31C is a region in the thickness direction of the laminated glass 31C where the first laminated glass member 21, the second laminated glass member 22, the first layer 1C, and the non-gradation portion 2CY of the second layer 2C are present. The second non-gradation region RZ of the laminated glass 31C is a region in the thickness direction of the laminated glass 31C where the first laminated glass member 21, the second laminated glass member 22, and the first layer 1C are present. The second non-gradation region RZ of the laminated glass 31C is a region in the thickness direction of the laminated glass 31C where the second layer 2C is not present.

[0106] Fig. 9 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a fifth embodiment of the present invention, and Fig. 10 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 9.

[0107] 9 is a cross-sectional view of the intermediate film 11D along the thickness direction. The intermediate film 11D has one end 11Da and the other end 11Db. The one end 11Da and the other end 11Db are end portions on both sides that face each other.

[0108] The interlayer film 11D includes a first layer 1D containing a colorant, a second layer 2D containing a colorant, a third layer 3D containing a colorant, and a fourth layer 4D not containing a colorant. The second layer 2D extends to one end 11Da of the interlayer film 11D. The second layer 2D does not extend to the other end 11Db of the interlayer film 11D. The one end 11Da of the interlayer film 11D is composed of the first layer 1D, the second layer 2D, the third layer 3D, and the fourth layer 4D. The other end 11Db of the interlayer film 11D is composed of the first layer 1D, the third layer 3D, and the fourth layer 4D.

[0109] The first layer 1D is disposed on both surface sides of the second layer 2D. The second layer 2D is embedded in the first layer 1D. The first layer 1D is a surface layer of the interlayer film 11D. The second layer 2D is an intermediate layer of the interlayer film 11D.

[0110] The third layer 3D is disposed on the surface of the fourth layer 4D opposite to the first layer 1D and is laminated thereon. The fourth layer 4D is disposed on the surface of the first layer 1D opposite to the second layer 2D and is laminated thereon. The third layer 3D is a surface layer of the interlayer film 11D. The fourth layer 4D is a middle layer of the interlayer film 11D. The fourth layer 4D is a sound-insulating layer.

[0111] The second layer 2D has only a non-gradation portion 2DY, which is a portion of the second layer 2D where the thickness is uniform.

[0112] In the interlayer film 11D, the region from one end 11Da to the other end 11Db is the colored region R. The colored region R has a first non-gradation region RY and a second non-gradation region RZ. The first non-gradation region RY is located closer to the one end 11Da than the second non-gradation region RZ. The colored region R, the first non-gradation region RY, and the second non-gradation region RZ are each determined by producing the above-mentioned laminated glass X and measuring the visible light transmittance of the laminated glass X.

[0113] The first non-gradation region RY of the interlayer 11D is a region in the thickness direction of the interlayer 11D where the first layer 1D, the non-gradation portion 2DY of the second layer 2D, the third layer 3D, and the fourth layer 4D exist. The second non-gradation region RZ of the interlayer 11D is a region in the thickness direction of the interlayer 11D where the first layer 1D, the third layer 3D, and the fourth layer 4D exist. The second non-gradation region RZ of the interlayer 11D is a region in the thickness direction of the interlayer 11D where the second layer 2D does not exist.

[0114] 10 is a cross-sectional view of laminated glass 31D taken along the thickness direction. The laminated glass 31D includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11D. The interlayer film 11D is disposed between the first laminated glass member 21 and the second laminated glass member 22. The first laminated glass member 21 is disposed and laminated on a first surface side of the interlayer film 11D. The second laminated glass member 22 is disposed and laminated on a second surface side of the interlayer film 11D, opposite the first surface.

[0115] The laminated glass 31D has one end 31Da and the other end 31Db. The one end 31Da and the other end 31Db are opposite ends. In the laminated glass 31D, the region from the one end 31Da to the other end 31Db is a colored region R. The colored region R has a first non-gradation region RY and a second non-gradation region RZ. The first non-gradation region RY is located closer to the one end 31Da than the second non-gradation region RZ.

[0116] The first non-gradation region RY of the laminated glass 31D is a region in the thickness direction of the laminated glass 31D where the first laminated glass member 21, the second laminated glass member 22, the first layer 1D, the non-gradation portion 2DY of the second layer 2D, the third layer 3D, and the fourth layer 4D are present. The second non-gradation region RZ of the laminated glass 31D is a region in the thickness direction of the laminated glass 31D where the first laminated glass member 21, the second laminated glass member 22, the first layer 1D, the third layer 3D, and the fourth layer 4D are present. The second non-gradation region RZ of the laminated glass 31D is a region in the thickness direction of the laminated glass 31D where the second layer 2D is not present.

[0117] Fig. 11 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a sixth embodiment of the present invention, and Fig. 12 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 11.

[0118] 11 is a cross-sectional view of the intermediate film 11E along the thickness direction. The intermediate film 11E has one end 11Ea and the other end 11Eb. The one end 11Ea and the other end 11Eb are end portions on both sides that face each other.

[0119] The interlayer film 11E includes a first layer 1E containing a colorant, a second layer 2E containing a colorant, a third layer 3E containing a colorant, and a fourth layer 4E not containing a colorant. The second layer 2E extends to one end 11Ea of the interlayer film 11E. The second layer 2E does not extend to the other end 11Eb of the interlayer film 11E. The one end 11Ea of the interlayer film 11E is composed of the first layer 1E, the second layer 2E, the third layer 3E, and the fourth layer 4E. The other end 11Eb of the interlayer film 11E is composed of the first layer 1E, the third layer 3E, and the fourth layer 4E.

[0120] A first layer 1E is disposed on one surface side of the second layer 2E. A fourth layer 4E is disposed on the other surface side of the second layer 2E. The second layer 2E is embedded between the first layer 1E and the fourth layer 4E. The first layer 1E is a surface layer of the interlayer film 11E. The second layer 2E is an intermediate layer of the interlayer film 11E.

[0121] The third layer 3E is disposed on the surface of the fourth layer 4E opposite to the first layer 1E and is laminated thereon. The fourth layer 4E is disposed on the surface of the second layer 2E opposite to the first layer 1E and is laminated thereon. The fourth layer 4E is also disposed on the surface of the first layer 1E and is laminated thereon. The third layer 3E is a surface layer of the interlayer film 11E. The fourth layer 4E is an intermediate layer of the interlayer film 11E. The fourth layer 4E is a sound-insulating layer.

[0122] The second layer 2E has only a non-gradation portion 2EY, which is a portion of the second layer 2E where the thickness is uniform.

[0123] In the interlayer film 11E, the region from one end 11Ea to the other end 11Eb is the colored region R. The colored region R has a first non-gradation region RY and a second non-gradation region RZ. The first non-gradation region RY is located closer to the one end 11Ea than the second non-gradation region RZ. The colored region R, the first non-gradation region RY, and the second non-gradation region RZ are each determined by producing the above-mentioned laminated glass X and measuring the visible light transmittance of the laminated glass X.

[0124] The first non-gradation region RY of the interlayer 11E is a region in the thickness direction of the interlayer 11E where the first layer 1E, the non-gradation portion 2EY of the second layer 2E, the third layer 3E, and the fourth layer 4E exist. The second non-gradation region RZ of the interlayer 11E is a region in the thickness direction of the interlayer 11E where the first layer 1E, the third layer 3E, and the fourth layer 4E exist. The second non-gradation region RZ of the interlayer 11E is a region in the thickness direction of the interlayer 11E where the second layer 2E does not exist.

[0125] 12 is a cross-sectional view of laminated glass 31E taken along the thickness direction. The laminated glass 31E includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11E. The interlayer film 11E is disposed between the first laminated glass member 21 and the second laminated glass member 22. The first laminated glass member 21 is disposed and laminated on a first surface side of the interlayer film 11E. The second laminated glass member 22 is disposed and laminated on a second surface side of the interlayer film 11E opposite the first surface.

[0126] The laminated glass 31E has one end 31Ea and the other end 31Eb. The one end 31Ea and the other end 31Eb are opposite ends. In the laminated glass 31E, the region from the one end 31Ea to the other end 31Eb is a colored region R. The colored region R has a first non-gradation region RY and a second non-gradation region RZ. The first non-gradation region RY is located closer to the one end 31Ea than the second non-gradation region RZ.

[0127] The first non-gradation region RY of the laminated glass 31E is a region in the thickness direction of the laminated glass 31E where the first laminated glass member 21, the second laminated glass member 22, the first layer 1E, the non-gradation portion 2EY of the second layer 2E, the third layer 3E, and the fourth layer 4E are present. The second non-gradation region RZ of the laminated glass 31E is a region in the thickness direction of the laminated glass 31E where the first laminated glass member 21, the second laminated glass member 22, the first layer 1E, the third layer 3E, and the fourth layer 4E are present. The second non-gradation region RZ of the laminated glass 31E is a region in the thickness direction of the laminated glass 31E where the second layer 2E is not present.

[0128] Fig. 13 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a seventh embodiment of the present invention, and Fig. 14 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 13.

[0129] The intermediate film 11F includes a first layer 1F containing a colorant and a second layer 2F containing a colorant. The second layer 2F extends to one end 11Fa of the intermediate film 11F. The second layer 2F extends to the other end 11Fb of the intermediate film 11F. The one end 11Fa portion and the other end 11Fb portion of the intermediate film 11F are composed of three layers: two first layers 1F and two second layers 2F.

[0130] First layers 1F are disposed on both surface sides of the second layer 2F. The two first layers 1F are surface layers of the interlayer 11F. The second layer 2F is an intermediate layer of the interlayer 11F.

[0131] The second layer 2F has only a gradation portion 2FX where the visible light transmittance increases from one end 11Fa of the intermediate film 11F to the other end 11Fb. The gradation portion 2FX is a portion where the thickness of the second layer 2F decreases from one end 11Fa of the intermediate film 11F to the other end 11Fb.

[0132] In the interlayer film 11F, the region from one end 11Fa to the other end 11Fb is a colored region R. The colored region R has only a gradation region RX. The colored region R and the gradation region RX are each set by producing the above-mentioned laminated glass X and measuring the visible light transmittance of the laminated glass X.

[0133] The gradation region RX of the intermediate film 11F is a region in which two first layers 1F and a second layer 2F exist in the thickness direction of the intermediate film 11F.

[0134] 14 is a cross-sectional view of laminated glass 31F taken along the thickness direction. The laminated glass 31F includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11F. The interlayer film 11F is disposed between the first laminated glass member 21 and the second laminated glass member 22. The first laminated glass member 21 is disposed and laminated on a first surface side of the interlayer film 11F. The second laminated glass member 22 is disposed and laminated on a second surface side of the interlayer film 11F, opposite the first surface.

[0135] The laminated glass 31F has one end 31Fa and the other end 31Fb. The one end 31Fa and the other end 31Fb are opposite ends. In the laminated glass 31F, the region from the one end 31Fa to the other end 31Fb is a colored region R. The colored region R has only a gradation region RX.

[0136] The gradation region RX of the laminated glass 31F is a region in the thickness direction of the laminated glass 31F where the first laminated glass member 21, the second laminated glass member 22, the two first layers 1F, and the second layer 2F are present.

[0137] Fig. 15 is a cross-sectional view schematically showing an interlayer film for laminated glass according to an eighth embodiment of the present invention, and Fig. 16 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 15.

[0138] 15 is a cross-sectional view of the intermediate film 11G along the thickness direction. The intermediate film 11G has one end 11Ga and the other end 11Gb. The one end 11Ga and the other end 11Gb are end portions on both sides that face each other.

[0139] The intermediate film 11G includes a first layer 1G containing a colorant, a second layer 2G containing a colorant, a third layer 3G containing a colorant, and a fourth layer 4G not containing a colorant. The second layer 2G extends to one end 11Ga of the intermediate film 11G. The second layer 2G extends to the other end 11Gb of the intermediate film 11G. The one end 11Ga portion and the other end 11Gb portion of the intermediate film 11G are composed of five layers: two first layers 1G, a second layer 2G, a third layer 3G, and a fourth layer 4G.

[0140] First layers 1G are disposed on both surface sides of the second layer 2G. One of the first layers 1G is a surface layer of an interlayer 11G. The second layer 2G is an intermediate layer of the interlayer 11G.

[0141] The third layer 3G is disposed on the surface of the fourth layer 4G opposite to the first layer 1G and is laminated thereon. The fourth layer 4G is disposed on the surface of the first layer 1G opposite to the second layer 2G and is laminated thereon. The third layer 3G is a surface layer of the interlayer film 11G. The fourth layer 4G is a middle layer of the interlayer film 11G. The fourth layer 4G is a sound-insulating layer.

[0142] The second layer 2G has only a gradation portion 2GX where the visible light transmittance increases from one end 11Ga of the intermediate film 11G toward the other end 11Gb. The gradation portion 2GX is a portion where the thickness of the second layer 2G decreases from one end 11Ga of the intermediate film 11G toward the other end 11Gb.

[0143] In the interlayer film 11G, the region from one end 11Ga to the other end 11Gb is a colored region R. The colored region R has only a gradation region RX. The colored region R and the gradation region RX are each set by producing the above-mentioned laminated glass X and measuring the visible light transmittance of the laminated glass X.

[0144] The gradation region RX of the intermediate film 11G is a region in which two first layers 1G, a second layer 2G, a third layer 3G, and a fourth layer 4G exist in the thickness direction of the intermediate film 11G.

[0145] 16 is a cross-sectional view of laminated glass 31G taken along the thickness direction. The laminated glass 31G includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11G. The interlayer film 11G is disposed between the first laminated glass member 21 and the second laminated glass member 22. The first laminated glass member 21 is disposed and laminated on a first surface side of the interlayer film 11G. The second laminated glass member 22 is disposed and laminated on a second surface side of the interlayer film 11G opposite the first surface.

[0146] The laminated glass 31G has one end 31Ga and the other end 31Gb. The one end 31Ga and the other end 31Gb are opposite ends. In the laminated glass 31G, the region from the one end 31Ga to the other end 31Gb is a colored region R. The colored region R has only a gradation region RX.

[0147] The gradation region RX of the laminated glass 31G is a region in the thickness direction of the laminated glass 31G where the first laminated glass member 21, the second laminated glass member 22, the two first layers 1G, the second layer 2G, the third layer 3G, and the fourth layer 4G are present.

[0148] Fig. 17 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a ninth embodiment of the present invention, and Fig. 18 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 17.

[0149] 17 is a cross-sectional view of the intermediate film 11H taken along the thickness direction. The intermediate film 11H has one end 11Ha and the other end 11Hb. The one end 11Ha and the other end 11Hb are opposite ends of the intermediate film 11H.

[0150] The interlayer film 11H includes a first layer 1H containing a colorant, a second layer 2H containing a colorant, a third layer 3H containing a colorant, and a fourth layer 4H not containing a colorant. The second layer 2H extends to one end 11Ha of the interlayer film 11H. The second layer 2H extends to the other end 11Hb of the interlayer film 11H. The one end 11Ha portion and the other end 11Hb portion of the interlayer film 11H are composed of the first layer 1H, the second layer 2H, the third layer 3H, and the fourth layer 4H.

[0151] The first layer 1H is disposed on one surface side of the second layer 2H. The fourth layer 4H is disposed on the other surface side of the second layer 2H. The second layer 2H is embedded between the first layer 1H and the fourth layer 4H. The first layer 1H is a surface layer of the interlayer film 11H. The second layer 2H is a middle layer of the interlayer film 11H.

[0152] The third layer 3H is disposed on the surface of the fourth layer 4H opposite to the first layer 1H and is laminated thereon. The fourth layer 4H is disposed on the surface of the second layer 2H opposite to the first layer 1H and is laminated thereon. The third layer 3H is a surface layer of the interlayer film 11H. The fourth layer 4H is a middle layer of the interlayer film 11H. The fourth layer 4H is a sound-insulating layer.

[0153] The second layer 2H has only a gradation portion 2HX where the visible light transmittance increases from one end 11Ha of the intermediate film 11H to the other end 11Hb of the intermediate film 11H. The gradation portion 2HX is a portion where the thickness of the second layer 2H decreases from one end 11Ha of the intermediate film 11H to the other end 11Hb of the intermediate film 11H.

[0154] In the interlayer film 11H, the region from one end 11Ha to the other end 11Hb is a colored region R. The colored region R has only a gradation region RX. The colored region R and the gradation region RX are each set by producing the above-mentioned laminated glass X and measuring the visible light transmittance of the laminated glass X.

[0155] The gradation region RX of the interlayer 11H is a region in the thickness direction of the interlayer 11H where the first layer 1H, the second layer 2H, the third layer 3H, and the fourth layer 4H are present.

[0156] 18 is a cross-sectional view of laminated glass 31H taken along the thickness direction. The laminated glass 31H includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11H. The interlayer film 11H is disposed between the first laminated glass member 21 and the second laminated glass member 22. The first laminated glass member 21 is disposed and laminated on a first surface side of the interlayer film 11H. The second laminated glass member 22 is disposed and laminated on a second surface side of the interlayer film 11H opposite the first surface.

[0157] The laminated glass 31H has one end 31Ha and the other end 31Hb. The one end 31Ha and the other end 31Hb are opposite ends. In the laminated glass 31H, the region from the one end 31Ha to the other end 31Hb is a colored region R. The colored region R has only a gradation region RX.

[0158] The gradation region RX of the laminated glass 31H is a region in the thickness direction of the laminated glass 31H where the first laminated glass member 21, the second laminated glass member 22, the first layer 1H, the second layer 2H, the third layer 3H, and the fourth layer 4H are present.

[0159] Fig. 19 is a cross-sectional view schematically showing an interlayer film for laminated glass according to a tenth embodiment of the present invention, and Fig. 20 is a cross-sectional view schematically showing laminated glass using the interlayer film for laminated glass shown in Fig. 19.

[0160] 19 and 20 schematically show the colorant Q contained in the second layer and the amount of colorant Q present. When the colorant is in particulate form, the actual size of the colorant is much smaller than the size shown in FIGS. 19 and 20. The colorant contained in the first layer is not shown in FIGS. 19 and 20. The colorant is not shown in cross-sectional views of interlayer films for laminated glass and laminated glass other than those in FIGS. 19 and 20.

[0161] 19 is a cross-sectional view of the intermediate film 111 along the thickness direction. The intermediate film 111 has one end 11Ia and the other end 11Ib. The one end 11Ia and the other end 11Ib are end portions on both sides that face each other.

[0162] The intermediate film 11I includes a first layer 1I containing a colorant and a second layer 2I containing a colorant Q. The second layer 2I extends to one end 11Ia of the intermediate film 11I. The second layer 2I extends to the other end 11Ib of the intermediate film 11I. The one end 11Ia portion and the other end 11Ib portion of the intermediate film 11I are composed of three layers: two first layers 1I and a second layer 2I.

[0163] A first layer 1I is disposed on both surface sides of the second layer 2I. The two first layers 1I are surface layers of an intermediate film 11I. The second layer 2I is an intermediate layer of the intermediate film 11I.

[0164] The second layer 2I has only a gradation portion 2IX. The gradation portion 2IX is a portion where the concentration of the colorant Q in the second layer 2I decreases from one end 11Ia of the intermediate film 11I toward the other end 11Ib.

[0165] In the interlayer film 11I, the region from one end 11Ia to the other end 11Ib is a colored region R. The colored region R has only a gradation region RX. The colored region R and the gradation region RX are each set by producing the above-mentioned laminated glass X and measuring the visible light transmittance of the laminated glass X.

[0166] The gradation region RX of the intermediate film 11I is a region in the thickness direction of the intermediate film 11I where two first layers 1I and a second layer 2I exist.

[0167] 20 is a cross-sectional view of laminated glass 31I taken along the thickness direction. The laminated glass 31I includes a first laminated glass member 21, a second laminated glass member 22, and an interlayer film 11I. The interlayer film 11I is disposed between the first laminated glass member 21 and the second laminated glass member 22. The first laminated glass member 21 is disposed and laminated on a first surface side of the interlayer film 11I. The second laminated glass member 22 is disposed and laminated on a second surface side of the interlayer film 11I opposite the first surface.

[0168] The laminated glass 31I has one end 31Ia and the other end 31Ib. The one end 31Ia and the other end 31Ib are opposite ends. In the laminated glass 31I, the region from the one end 31Ia to the other end 31Ib is a colored region R. The colored region R has only a gradation region RX.

[0169] The gradation region RX of the laminated glass 31I is a region in the thickness direction of the laminated glass 31I where the first laminated glass member 21, the second laminated glass member 22, the two first layers 1I, and the second layer 2I exist.

[0170] As in the interlayer film 11I and the laminated glass 31I, the gradation region may be formed due to a change in the concentration of the colorant, or due to a change in the thickness of the layer containing the colorant.

[0171] Other details of the interlayer film and each of the components constituting the laminated glass will be described below.

[0172] (Interlayer film for laminated glass) The interlayer film has a single-layer structure or a two- or more-layer structure. The interlayer film may have a single-layer structure, a two-layer structure, a two- or more-layer structure, a three-layer structure, a three- or more-layer structure, a four- or more-layer structure, a five- or more-layer structure, or a six- or more-layer structure.

[0173] The structure of the interlayer film may differ partially. For example, the interlayer film may have a portion having a single-layer structure and a portion having a two or more-layer structure. The interlayer film may have a portion having a single-layer structure and a portion having a three or more-layer structure. The interlayer film may have a portion having a two-layer structure and a portion having a three or more-layer structure. When the interlayer film has a two or more-layer structure, the entire interlayer film does not have to have a two or more-layer structure in the direction perpendicular to the thickness direction of the interlayer film, and the interlayer film may partially have a single-layer structure.

[0174] The interlayer preferably includes a first layer and a second layer, with the first layer disposed on the first surface side of the second layer. The first layer preferably contains a colorant, more preferably contains a resin and a colorant. The second layer preferably contains a colorant, more preferably contains a resin and a colorant.

[0175] From the viewpoint of suppressing deterioration of color tone, it is preferable that the first layer be disposed on the second surface side of the second layer opposite to the first surface side of the second layer in the interlayer film, and from the viewpoint of suppressing deterioration of color tone, it is preferable that the second layer be embedded in the first layer.

[0176] From the viewpoint of suppressing deterioration of color tone, it is preferable that in the interlayer film, the first layer is disposed on the first surface side of the second layer, and the first layer is disposed on the second surface side of the second layer. From the viewpoint of suppressing deterioration of color tone, it is preferable that the second layer is disposed between the first layers.

[0177] Preferably, the interlayer film comprises a first layer, a second layer, and a third layer, with the first layer disposed on a first surface side of the second layer and the third layer disposed on a second surface side of the second layer opposite the first surface. In this case, the first layer may be disposed between the third layer and the second layer, or a fourth layer may be disposed between the first layer and the fourth layer. In this case, the third layer preferably contains a colorant, and more preferably contains a resin and a colorant.

[0178] Preferably, the interlayer film comprises a first layer, a second layer, a third layer, and a fourth layer, with the first layer disposed on a first surface side of the second layer, the fourth layer disposed on a second surface side of the second layer opposite the first surface, and the third layer disposed on a surface side of the fourth layer opposite the first layer. In this case, it is also preferable that the second layer is embedded in the first layer, the fourth layer disposed on a first surface side of the first layer, and the third layer disposed on a surface side of the fourth layer opposite the first layer.

[0179] In addition, the intermediate film may have a functional film such as an infrared reflective film disposed therein. In the intermediate film, a functional film such as an infrared reflective film may be disposed between the first layer and the fourth layer.

[0180] The first layer, the second layer, the third layer, and the fourth layer may each have the same composition or different compositions.

[0181] The fourth layer is not particularly limited, but may be a layer having excellent sound insulation properties. The fourth layer may be a sound-insulating layer. When the fourth layer is a sound-insulating layer, the sound insulation properties, appearance integrity, and appearance design of the laminated glass can be improved.

[0182] The interlayer film will be described in further detail below.

[0183] <Resin> The intermediate film preferably contains a resin. The first layer preferably contains a resin. The second layer preferably contains a resin. The third layer preferably contains a resin. The fourth layer preferably contains a resin. Examples of the resin include a thermosetting resin and a thermoplastic resin. Only one type of the resin may be used, or two or more types may be used in combination.

[0184] Examples of the thermoplastic resin include polyvinyl acetal resin, polyester resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, polyurethane resin, polyvinyl alcohol resin, etc. Thermoplastic resins other than these may also be used.

[0185] <Plasticizer> The interlayer preferably contains a plasticizer. The first layer preferably contains a plasticizer. The second layer preferably contains a plasticizer. The third layer preferably contains a plasticizer. The fourth layer preferably contains a plasticizer. When the thermoplastic resin contained in the interlayer is a polyvinyl acetal resin, it is particularly preferable that the interlayer (each layer) contains a plasticizer. Only one type of plasticizer may be used, or two or more types may be used in combination.

[0186] Examples of the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, organic phosphate plasticizers, and organic phosphite plasticizers. Organic ester plasticizers are preferred. The plasticizer is preferably a liquid plasticizer.

[0187] Examples of the monobasic organic acid ester include glycol esters obtained by reacting glycol with a monobasic organic acid. Examples of the glycol include triethylene glycol, tetraethylene glycol, and tripropylene glycol. Examples of the monobasic organic acid include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptyl acid, n-octylic acid, 2-ethylhexyl acid, n-nonylic acid, decylic acid, and benzoic acid.

[0188] Examples of the polybasic organic acid ester include ester compounds of a polybasic organic acid and an alcohol having a linear or branched structure and having 4 to 8 carbon atoms. Examples of the polybasic organic acid include adipic acid, sebacic acid, and azelaic acid.

[0189] Examples of the organic ester plasticizer include triethylene glycol di-2-ethylpropanoate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dicaprylate, triethylene glycol di-n-octanoate, triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethylbutyrate, 1,3-propylene glycol di-2-ethylbutyrate, 1,4-butylene glycol di-2-ethylbutyrate, and diethylene glycol di-2-ethylbutylene. Examples of suitable organic ester plasticizers include diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylpentanoate, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol dicaprylate, diethylene glycol dibenzoate, dipropylene glycol dibenzoate, dihexyl adipate, dioctyl adipate, hexylcyclohexyl adipate, a mixture of heptyl adipate and nonyl adipate, diisononyl adipate, diisodecyl adipate, heptylnonyl adipate, dibutyl sebacate, oil-modified alkyd sebacate, and a mixture of a phosphate ester and an adipate. Organic ester plasticizers other than those listed above may also be used as the organic ester plasticizer. Furthermore, adipic acid esters other than the above-mentioned adipic acid esters may also be used as the adipic acid ester.

[0190] Examples of the organic phosphoric acid plasticizer include tributoxyethyl phosphate, isodecylphenyl phosphate, and triisopropyl phosphate.

[0191] The plasticizer is preferably a diester plasticizer represented by the following formula (1):

[0192] [ka]

[0193] In the above formula (1), R1 and R2 each represent an organic group having 5 to 10 carbon atoms, R3 represents an ethylene group, an isopropylene group, or an n-propylene group, and p represents an integer of 3 to 10. In the above formula (1), R1 and R2 each preferably represent an organic group having 6 to 10 carbon atoms.

[0194] The plasticizer preferably includes triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH), or triethylene glycol di-2-ethylpropanoate, more preferably triethylene glycol di-2-ethylhexanoate (3GO) or triethylene glycol di-2-ethylbutyrate (3GH), and even more preferably triethylene glycol di-2-ethylhexanoate (3GO).

[0195] In the interlayer film, the content of the plasticizer relative to 100 parts by weight of the resin (100 parts by weight of the thermoplastic resin when the resin is a thermoplastic resin; 100 parts by weight of the polyvinyl acetal resin when the resin is a polyvinyl acetal resin) is defined as content (0). The content (0) is preferably 25 parts by weight or more, more preferably 30 parts by weight or more, and preferably 100 parts by weight or less, more preferably 60 parts by weight or less, and even more preferably 50 parts by weight or less. When the content (0) is at least the lower limit, the penetration resistance of the laminated glass is further improved. When the content (0) is at most the upper limit, the transparency of the interlayer film is further improved.

[0196] <Coloring agent> The intermediate film preferably contains a colorant. The first layer preferably contains a colorant. The second layer preferably contains a colorant. The third layer may or may not contain a colorant. The fourth layer may or may not contain a colorant. At least one of the first layer and the second layer preferably contains a colorant. It is more preferable that both the first layer and the second layer contain a colorant.

[0197] Examples of the colorant include inorganic particles, dyes, pigments, etc. The colorant may be used alone or in combination of two or more.

[0198] Examples of the inorganic particles include carbon black particles, carbon nanotube particles, graphene particles, iron oxide particles, zinc oxide particles, calcium carbonate particles, alumina particles, kaolin clay particles, calcium silicate particles, magnesium oxide particles, magnesium hydroxide particles, aluminum hydroxide particles, magnesium carbonate particles, talc particles, feldspar powder particles, mica particles, baryte particles, barium carbonate particles, titanium oxide particles, silica particles, and glass beads. Only one type of the inorganic particles may be used, or two or more types may be used in combination.

[0199] The inorganic particles preferably include carbon black particles, carbon nanotube particles, graphene particles, calcium carbonate particles, titanium oxide particles, or silica particles, more preferably carbon black particles or calcium carbonate particles, and even more preferably carbon black particles. Use of these preferred inorganic particles reduces uneven appearance when light passes through, thereby providing laminated glass with even more excellent appearance design.

[0200] The average particle size of the inorganic particles is preferably 0.01 μm or more, more preferably 0.5 μm or more, and preferably 100 μm or less, more preferably 50 μm or less, and even more preferably 10 μm or less. The average particle size indicates the weight-average particle size. The average particle size can be measured by dynamic light scattering using a light scattering measurement device with a laser as a light source. An example of the light scattering measurement device is the "DLS-6000AL" manufactured by Otsuka Electronics Co., Ltd.

[0201] Examples of the dye include pyrene-based dyes, aminoketone-based dyes, anthraquinone-based dyes, azo-based dyes, etc. The dyes may be used alone or in combination of two or more.

[0202] Examples of the pyrene dye include Solvent Green 5 (CAS79869-59-3) and Solvent Green 7 (CAS6358-69-6).

[0203] Examples of the aminoketone dyes include Solvent Yellow 98 (CAS12671-74-8), Solvent Yellow 85 (CAS12271-01-1), Solvent Red 179 (CAS8910-94-5), and Solvent Red 135 (CAS71902-17-5).

[0204] Examples of the anthraquinone dyes include Solvent Yellow 163 (CAS13676091-0), Solvent Red 207 (CAS15958-69-6), Disperse Red 92 (CAS12236-11-2), Solvent Violet 13 (CAS81-48-1), Disperse Violet 31 (CAS6408-72-6), Solvent Blue 97 (CAS61969-44-6), Solvent Blue 45 (CAS37229-23-5), Solvent Blue 104 (CAS116-75-6), and Disperse Blue 214 (CAS104491-84-1).

[0205] Examples of the azo dyes include Solvent Yellow 30 (CAS 3321-10-4), Solvent Red 164 (CAS 70956-30-8), and Disperse Blue 146 (CAS 88650-91-3).

[0206] The pigment may be an organic pigment or an inorganic pigment. The organic pigment may be an organic pigment having a metal atom or an organic pigment not having a metal atom. Only one type of the pigment may be used, or two or more types may be used in combination.

[0207] Examples of the organic pigment include phthalocyanine compounds, quinacridone compounds, azo compounds, pentaphene compounds, perylene compounds, indole compounds, and dioxazine compounds.

[0208] The first layer preferably contains carbon black particles, carbon nanotube particles, graphene particles, calcium carbonate particles, titanium oxide particles, silica particles, or a phthalocyanine compound, more preferably calcium carbonate particles or carbon black particles, and even more preferably carbon black particles. The second layer preferably contains carbon black particles, carbon nanotube particles, graphene particles, calcium carbonate particles, titanium oxide particles, silica particles, or a phthalocyanine compound, more preferably calcium carbonate particles or carbon black particles, and even more preferably carbon black particles. The third layer preferably contains carbon black particles, carbon nanotube particles, graphene particles, calcium carbonate particles, titanium oxide particles, silica particles, or a phthalocyanine compound, more preferably calcium carbonate particles or carbon black particles, and even more preferably carbon black particles. The use of these components reduces appearance unevenness when light passes through, resulting in laminated glass with even better appearance design.

[0209] When the interlayer film and the laminated glass Y have a first non-gradation region and a second non-gradation region, the total content of the colorant contained in each layer of the interlayer film that constitutes the first non-gradation region is defined as content (Y), and the total content of the colorant contained in each layer of the interlayer film that constitutes the second non-gradation region is defined as content (Z). The weight ratio of content (Z) to content (Y) (content (Z) / content (Y)) is preferably 0.15 or more, more preferably 0.2 or more, and preferably 0.95 or less, more preferably 0.85 or less. When the weight ratio (content (Z) / content (Y)) is equal to or greater than the above lower limit and equal to or less than the above upper limit, the absolute value of the difference between the first visible light transmittance and the second visible light transmittance can be easily controlled, thereby further improving the uniformity of the appearance.

[0210] <Other ingredients> The interlayer film, the first layer, the second layer, the third layer, and the fourth layer may each contain, as necessary, additives such as heat-shielding particles, light-shielding agents, colorants, ultraviolet absorbers, antioxidants, adhesion modifiers, light stabilizers, flame retardants, antistatic agents, moisture-resistant agents, heat-reflecting agents, and heat-absorbing agents. Only one type of the additives may be used, or two or more types may be used in combination.

[0211] The first layer may contain the heat-shielding particles. The second layer may contain the heat-shielding particles. The third layer may contain the heat-shielding particles. The fourth layer may contain the heat-shielding particles. It is preferable that at least one layer of the interlayer film constituting the colored region contains heat-shielding particles. Infrared rays, which have wavelengths of 780 nm or more, longer than visible light, have less energy than ultraviolet rays. However, infrared rays have a strong thermal effect, and when infrared rays are absorbed by a substance, they are released as heat. For this reason, infrared rays are generally called heat rays. The use of the heat-shielding particles can effectively block infrared rays (heat rays). Note that heat-shielding particles refer to particles that can absorb infrared rays. When the interlayer film contains heat-shielding particles, the heat shielding properties and appearance design of the laminated glass can be improved.

[0212] Specific examples of the heat-shielding particles include metal oxide particles such as aluminum-doped tin oxide particles, indium-doped tin oxide particles, antimony-doped tin oxide particles (ATO particles), gallium-doped zinc oxide particles (GZO particles), indium-doped zinc oxide particles (IZO particles), aluminum-doped zinc oxide particles (AZO particles), niobium-doped titanium oxide particles, sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, rubidium-doped tungsten oxide particles, tin-doped indium oxide particles (ITO particles), tin-doped zinc oxide particles, and silicon-doped zinc oxide particles, as well as lanthanum hexaboride (LaB6) particles. Other heat-shielding particles may also be used. Only one type of the heat-shielding particles may be used, or two or more types may be used in combination.

[0213] The average particle size of the heat-shielding particles is preferably 10 nm or more, more preferably 20 nm or more, and preferably 100 nm or less, more preferably 80 nm or less, and even more preferably 50 nm or less. When the average particle size is equal to or greater than the lower limit, the heat ray shielding property can be sufficiently improved. When the average particle size is equal to or less than the upper limit, the dispersibility of the heat-shielding particles is improved.

[0214] The "average particle size" refers to the volume-average particle size. The average particle size can be measured using a particle size distribution analyzer ("UPA-EX150" manufactured by Nikkiso Co., Ltd.) or the like.

[0215] <Combination with other functional films> The interlayer film may include other functional films for the purpose of achieving other functions. Examples of such functional films include infrared reflective films, colored films, and films with printed designs. For example, the interlayer film may include an infrared reflective film in order to improve heat insulation. For example, the interlayer film may include a colored film or a film with printed designs in order to further improve design or to combine it with other patterns.

[0216] The interlayer film including the functional film preferably has, for example, the first layer and the second layer disposed on a first surface side of the functional film, the third layer disposed on a second surface side of the functional film opposite the first surface, and the second layer disposed between the first layers. In the interlayer film including the functional film, the layer disposed on the first surface side of the functional film may be a single layer or multiple layers. In the interlayer film including the functional film, the layer disposed on the second surface side of the functional film may be a single layer or multiple layers. The interlayer film including the functional film may have the first layer, the second layer, and the third layer on the first surface side of the functional film, or may have the first layer, the second layer, the third layer, and the fourth layer on the first surface side of the functional film. Furthermore, the interlayer film including the functional film may have the third layer and the fourth layer on the second surface side of the functional film.

[0217] Examples of the infrared reflective film include a resin film with a metal foil, a multilayer laminate film in which a metal layer and a dielectric layer are formed on a resin film, a multilayer resin film, a liquid crystal film, etc. These films have the ability to reflect infrared rays.

[0218] The metal foil-coated resin film includes a resin film and a metal foil laminated on the outer surface of the resin film. Examples of materials for the resin film include polyethylene terephthalate resin, polyethylene naphthalate resin, polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, polyurethane resin, polyvinyl alcohol resin, polyolefin resin, polyvinyl chloride resin, and polyimide resin. Examples of materials for the metal foil include aluminum, copper, silver, gold, palladium, and alloys containing these.

[0219] The multilayer laminate film in which a metal layer and a dielectric layer are formed on the resin film is a multilayer laminate film in which any number of metal layers and dielectric layers are alternately laminated on a resin film. In the multilayer laminate film in which a metal layer and a dielectric layer are formed on the resin layer, it is preferable that all of the metal layers and dielectric layers are alternately laminated, but there may be a structural portion in which some of the layers are not alternately laminated, such as metal layer / dielectric layer / metal layer / dielectric layer / metal layer / metal layer / dielectric layer / metal layer.

[0220] Examples of materials for the resin film in the multilayer laminate film include polyethylene, polypropylene, polylactic acid, poly(4-methylpentene-1), polyvinylidene fluoride, cyclic polyolefins, polymethyl methacrylate, polyvinyl chloride, polyvinyl alcohol, polyamides such as nylon 6, 11, 12, and 66, polystyrene, polycarbonate, polyethylene terephthalate, polyethylene naphthalate, polyester, polyphenylene sulfide, and polyetherimide. Examples of materials for the metal layer in the multilayer laminate film include materials similar to those for the metal foil in the metal foil-coated resin film. A coating layer of metal or mixed metal oxides can be applied to both or one side of the metal layer. Examples of materials for the coating layer include ZnO, Al2O3, Ga2O3, InO3, MgO, Ti, NiCr, and Cu. Examples of materials for the dielectric layer in the multilayer laminate film include indium oxide.

[0221] The multilayer resin film is a laminate film in which a plurality of resin films are laminated. Examples of materials for the multilayer resin film include the same materials as the materials for the resin films in the multilayer laminate film. The number of resin films laminated in the multilayer resin film is 2 or more, or may be 3 or more, or may be 5 or more. The number of resin films laminated in the multilayer resin film may be 1000 or less, 100 or less, or 50 or less.

[0222] The multilayer resin film may be a multilayer resin film in which two or more types of thermoplastic resin layers having different optical properties (refractive indexes) are alternately or randomly laminated in any number of layers, and is configured to obtain the desired infrared reflectivity.

[0223] The liquid crystal film may be a film formed by laminating any number of cholesteric liquid crystal layers that reflect light of any wavelength, and is configured to provide the desired infrared reflectivity.

[0224] The infrared reflective film may contain infrared reflective particles. The infrared reflective particles are particles that have infrared reflectivity, such as tabular particles having a thickness of 1 nm to 1000 μm. For example, in a resin film in which silver nanodisks are dispersed, an infrared reflective film having infrared reflectivity can be obtained by adjusting the thickness, surface area, and arrangement of the silver nanodisks.

[0225] (First and second laminated glass members) Examples of the first and second laminated glass members include glass plates and PET (polyethylene terephthalate) films. The laminated glass includes not only laminated glass in which an interlayer film is sandwiched between two glass plates, but also laminated glass in which an interlayer film is sandwiched between a glass plate and a PET film or the like. The laminated glass is a laminate including glass plates, and preferably contains at least one glass plate. It is preferable that the first and second laminated glass members are each glass plates or PET (polyethylene terephthalate) films, and that the laminated glass includes at least one glass plate as the first and second laminated glass members. It is particularly preferable that both the first and second laminated glass members are glass plates.

[0226] Examples of the glass plate include inorganic glass and organic glass. Examples of the inorganic glass include float glass, heat-absorbing glass, heat-reflecting glass, polished glass, patterned glass, wired glass, striped glass, and green glass. The organic glass is a synthetic resin glass that replaces inorganic glass. Examples of the organic glass include polycarbonate plates and poly(meth)acrylic resin plates. Examples of the poly(meth)acrylic resin plates include polymethyl(meth)acrylate plates.

[0227] The thickness of each of the first laminated glass member and the second laminated glass member is not particularly limited, but is preferably 1 mm or more and 5 mm or less. When the laminated glass member is a glass plate, the thickness of the glass plate is preferably 1 mm or more and 5 mm or less. When the laminated glass member is a PET film, the thickness of the PET film is preferably 0.03 mm or more and 0.5 mm or less.

[0228] The thicknesses of the first and second laminated glass members refer to average thicknesses.

[0229] (Interlayer and other details of laminated glass) The interlayer film has one end and another end opposite the one end. The one end and the other end are opposite ends of the interlayer film. The interlayer film may be an interlayer film having the same thickness at the one end and the other end, an interlayer film having a thickness at the other end greater than the thickness at the one end, or an interlayer film having a thickness at the one end greater than the thickness at the other end.

[0230] The maximum thickness of the interlayer is preferably 0.1 mm or more, more preferably 0.25 mm or more, even more preferably 0.5 mm or more, particularly preferably 0.8 mm or more, and is preferably 3.8 mm or less, more preferably 2 mm or less, even more preferably 1.5 mm or less.

[0231] From the viewpoint of practical use and of sufficiently increasing adhesive strength and penetration resistance, the maximum thickness of the surface layer of the interlayer film is preferably 0.001 mm or more, more preferably 0.2 mm or more, and even more preferably 0.3 mm or more, and is preferably 1 mm or less, and more preferably 0.8 mm or less.

[0232] From the viewpoint of practicality and of sufficiently increasing penetration resistance, the maximum thickness of the layer (intermediate layer) disposed between the two surface layers of the interlayer film is preferably 0.001 mm or more, more preferably 0.1 mm or more, even more preferably 0.2 mm or more, and is preferably 0.8 mm or less, more preferably 0.6 mm or less, even more preferably 0.3 mm or less.

[0233] The interlayer film and laminated glass according to the present invention can be used in automobiles, railway vehicles, aircraft, ships, buildings, etc. The interlayer film and laminated glass according to the present invention are preferably used in rear glass, roof glass, or rear-roof integrated glass, and are more preferably used in rear-roof integrated glass.

[0234] Examples of methods for producing the interlayer film include the following production method (1) and production method (2). Note that the interlayer film may also be produced by other production methods.

[0235] Manufacturing method (1): A composition for forming the first layer (a composition containing a colorant) is co-extruded from a first extruder, and a composition for forming the second layer (a composition containing a colorant) is co-extruded from a second extruder. When the composition for forming the second layer is supplied from the second extruder, the gradation pattern is controlled by a slit in a feed block placed in front of the mold. The slit thickness is reduced at least on one end. The first layer and second layer are merged in the feed block, resulting in an interlayer film containing a specific second layer.

[0236] Manufacturing method (2): A composition for forming the first and third layers (a composition containing a colorant) is co-extruded from a first extruder, a composition for forming the second layer (a composition containing a colorant) is co-extruded from a second extruder, and a composition for forming the fourth layer (a composition not containing a colorant) is co-extruded from a third extruder. The compositions for forming the first and third layers extruded from the first extruder are split in a feed block placed in front of the mold and placed at the position of the surface layer, respectively. When the composition for forming the second layer is supplied from the second extruder, the gradation pattern is controlled by a slit in the feed block placed in front of the mold. Note that the slit thickness is reduced at least on one end. The first layer, second layer, third layer, and fourth layer are merged in the feed block to obtain an interlayer film containing a specific second layer.

[0237] The laminated glass can be produced by the following method.

[0238] The resulting interlayer film is sandwiched between the first laminated glass member and the second laminated glass member to obtain a laminate. Next, the resulting laminate is passed through a pressure roll or placed in a rubber bag and subjected to vacuum suction to remove any air remaining between the first laminated glass member, the second laminated glass member, and the interlayer film. This is followed by pre-bonding at approximately 70°C to 110°C to obtain a pre-pressure-bonded laminate. The pre-pressure-bonded laminate is then placed in an autoclave or pressed at approximately 120°C to 150°C and a pressure of 1 MPa to 1.5 MPa to obtain a laminated glass.

[0239] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0240] The polyvinyl acetal resin used was acetalized using n-butylaldehyde, which has four carbon atoms. The degree of acetalization (degree of butyralization), degree of acetylation, and hydroxyl group content of the polyvinyl acetal resin were measured according to JIS K6728 "Testing Methods for Polyvinyl Butyral." Note that when measured according to ASTM D1396-92, the values ​​were similar to those obtained by the method according to JIS K6728 "Testing Methods for Polyvinyl Butyral."

[0241] Example 1 Preparation of the composition for forming the first layer: 100 parts by weight of polyvinyl butyral resin, 40 parts by weight of plasticizer (3GO), and 0.022 parts by weight of carbon black particles (colorant) were blended and thoroughly kneaded with a mixing roll to obtain a composition for forming the first layer.

[0242] Preparation of the composition for forming the second layer: 100 parts by weight of polyvinyl butyral resin, 40 parts by weight of plasticizer (3GO), and 0.331 parts by weight of carbon black particles (colorant) were blended and thoroughly kneaded with a mixing roll to obtain a composition for forming the second layer.

[0243] Preparation of interlayer: An interlayer film having the structure shown in FIG. 1 was produced as follows.

[0244] The composition for forming the first layer was co-extruded from the first extruder, and the composition for forming the second layer was co-extruded from the second extruder. When the composition for forming the second layer was fed from the second extruder, the gradation pattern was controlled by a slit in the feed block placed in front of the mold. The slit thickness was reduced at least on one end. The first layer and the second layer were merged in the feed block to obtain an interlayer film. The extrusion temperature was 200°C.

[0245] The distance between one end of the interlayer and the other end (length in the width direction, referred to as "length (distance between one end and the other end)" in the table) was 200 cm. The distance in the direction perpendicular to the direction between one end of the interlayer and the other end (width direction) was 50 cm. In the plane direction of the interlayer, the length of the non-gradation portion of the second layer and the length of the gradation portion of the second layer were set as shown in Table 1 below.

[0246] Laminated glass production: Two sheets of clear glass (2 mm thick, 200 cm long, 50 cm wide) conforming to JIS R3202:1996 were prepared. The obtained interlayer film was sandwiched between the two sheets of clear glass so that the vertical direction of the clear glass and the direction connecting one end to the other end of the interlayer film were the same direction, and so that the horizontal direction of the clear glass and the direction perpendicular to the direction connecting one end to the other end of the interlayer film were the same direction. Next, the laminated glass was held at 90°C for 30 minutes in a vacuum laminator and vacuum pressed to obtain a laminated glass. The obtained laminated glass also corresponds to the above-mentioned laminated glass X.

[0247] Examples 2 to 4 Interlayer films and laminated glasses were produced in the same manner as in Example 1, except that the content of the colorant and the configuration of the interlayer film were changed as shown in Tables 1 and 2.

[0248] Example 5 Interlayer films and laminated glass were produced in the same manner as in Example 1, except that calcium carbonate particles were used as the colorant in the amounts shown in Table 2 and the configuration of the interlayer film was changed as shown in Table 2.

[0249] Example 6 Preparation of compositions for forming the first and third layers: 100 parts by weight of polyvinyl butyral resin, 40 parts by weight of plasticizer (3GO), and 0.027 parts by weight of carbon black particles (colorant) were blended and thoroughly kneaded with a mixing roll to obtain a composition for forming the first layer and the third layer.

[0250] Preparation of the composition for forming the second layer: 100 parts by weight of polyvinyl butyral resin, 40 parts by weight of plasticizer (3GO), and 0.340 parts by weight of carbon black particles (colorant) were blended and thoroughly kneaded with a mixing roll to obtain a composition for forming the second layer.

[0251] Preparation of the composition for forming the fourth layer: 100 parts by weight of polyvinyl butyral resin and 60 parts by weight of plasticizer (3GO) were blended and thoroughly kneaded with a mixing roll to obtain a composition for forming the fourth layer.

[0252] Preparation of interlayer: An interlayer film having the structure shown in FIG. 3 was produced as follows.

[0253] The composition for forming the first and third layers (composition containing a colorant) was co-extruded from the first extruder, the composition for forming the second layer (composition containing a colorant) was co-extruded from the second extruder, and the composition for forming the fourth layer (composition not containing a colorant) was co-extruded from the third extruder. The compositions for forming the first and third layers extruded from the first extruder were split into separate flows in a feed block located in front of the mold and placed at the position of the surface layer. When the composition for forming the second layer was fed from the second extruder, the gradation pattern was controlled by a slit in the feed block located in front of the mold. Note that the slit thickness was reduced at at least one end. The first, second, third, and fourth layers were merged in the feed block to obtain an interlayer film. Note that the extrusion temperature was 200°C.

[0254] The distance between one end of the interlayer and the other end (width direction length, referred to as "length (distance between one end and the other end)" in the table) was 200 cm. The distance between one end of the interlayer and the other end (width direction) in the direction perpendicular to this was 50 cm. In the plane direction of the interlayer, the length of the non-gradation portion of the second layer and the length of the gradation portion of the second layer were set as shown in Table 3 below.

[0255] Laminated glass production: Except for using the obtained interlayer film, a laminated glass was obtained in the same manner as in Example 1. The obtained laminated glass also corresponds to the laminated glass X described above.

[0256] (Examples 7 to 16 and Comparative Examples 1 and 2) Interlayer films and laminated glass were produced in the same manner as in Example 6, except that the content of the colorant and the configuration of the interlayer film were changed as shown in Tables 3 to 6. The content of the colorant used to form the third layer was set to be the same as the content of the colorant used to form the first layer. No colorant was blended into the fourth layer.

[0257] Example 17 Interlayer films and laminated glasses were produced in the same manner as in Example 1, except that the content of the colorant and the configuration of the interlayer film were changed as shown in Table 6.

[0258] (Examples 18 to 27) Interlayer films and laminated glasses were produced in the same manner as in Example 1, except that the colorant content, the configuration of the interlayer film, and the configuration of the laminated glass were changed as shown in Tables 7-9.

[0259] (evaluation) (1) Visible light transmittance of laminated glass The visible transmittance of the resulting laminated glass was measured in the wavelength range of 380 nm to 780 nm using a spectrophotometer (Hitachi High-Technologies Corporation, "U-4100") in accordance with JIS R3106:1998.

[0260] The visible light transmittance of the obtained laminated glass was measured and the following values ​​are shown in Tables 1 to 9 below.

[0261] 1) The area (%) of the colored region with a visible light transmittance of 1% to 50% out of the total area (100%) of the interlayer film or the total area (100%) of the laminated glass 2) Planar area (%) of the first non-gradation region out of 100% of the total planar area of ​​the interlayer film or 100% of the total planar area of ​​the laminated glass 3) Planar area (%) of the gradation region out of the total planar area (100%) of the interlayer film or the total planar area (100%) of the laminated glass 4) Planar area (%) of the second non-gradation region out of 100% of the total planar area of ​​the interlayer film or 100% of the total planar area of ​​the laminated glass 5) First visible light transmittance (%) (visible light transmittance of the interlayer film or laminated glass at a position 5 cm from one end of the laminated glass to the other end) 6) Second visible light transmittance (%) (visible light transmittance of the interlayer film or laminated glass at a position 5 cm from one end to the other end of the laminated glass) 7) Absolute value (%) of the difference between the first visible light transmittance and the second visible light transmittance 8) The maximum absolute value of the rate of change in visible light transmittance in the colored area from one end of the interlayer film or laminated glass to the other end (% / mm)

[0262] (2) Uniform appearance The laminated glass was installed at an angle of 30 degrees to the horizontal. Twenty evaluators visually inspected the entire laminated glass from a distance of 3 m and evaluated the integrity of the appearance according to the following criteria. Tables 1 to 9 show the number of people who evaluated the glass as "good."

[0263] [Criteria for determining appearance consistency] ○ (Good): The boundary where the color tone changes is difficult to see, and the laminated glass can be seen as a single unit. × (bad): The boundary where the color tone changes is easily visible, and the laminated glass cannot be seen as a single unit.

[0264] The interlayer film and laminated glass configurations, as well as the results, are shown in Tables 1 to 9 below. The type of laminated glass element in the table indicates the type of the first laminated glass element / the type of the second laminated glass element. The thickness of the laminated glass element in the table indicates the thickness of the first laminated glass element / the thickness of the second laminated glass element. Regarding the type of laminated glass element in the table, "C" means clear glass, "G" means green glass, "A" means highly transparent glass (Corning Gorilla Glass), and "B" means borosilicate glass. Regarding the type of colorant in the table, "CB" means carbon black particles, "CCA" means calcium carbonate particles, "Pc" means copper phthalocyanine particles (Pigment Blue 15-1), and "P" means perylene particles (Pigment Red 149). *1 in the table indicates the "planar area of ​​the colored region" as "the planar area of ​​the colored region with a visible light transmittance of 1% to 50% out of a total planar area of ​​100%." In the table, *2, "maximum absolute value of the rate of change in visible light transmittance" refers to "maximum absolute value of the rate of change in visible light transmittance in the colored region from one end to the other." In the table, *3, "weight ratio of colorant in two regions" refers to "total content of colorant contained in each layer of the interlayer film that makes up the second non-gradation region / total content of colorant contained in each layer of the interlayer film that makes up the first non-gradation region."

[0265] [Table 1]

[0266] [Table 2]

[0267] [Table 3]

[0268] [Table 4]

[0269]

Table 5

[0270]

Table 6

[0271]

Table 7

[0272]

Table 8

[0273]

Table 9

Explanation of Symbols

[0274] 1, 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1I… The first layer 2, 2A, 2B, 2C, 2D, 2E, 2F, 2G, 2H, 2I… The second layer 2X, 2AX, 2BX, 2FX, 2GX, 2HX, 2IX… Gradation part 2Y, 2AY, 2BY, 2CY, 2DY, 2EY… Non-gradation part 3A, 3B, 3D, 3E, 3G, 3H… The third layer 4A, 4B, 4D, 4E, 4G, 4H… The fourth layer 11, 11A, 11B, 11C, 11D, 11E, 11F, 11G, 11H, 11I… Intermediate film 11a, 11Aa, 11Ba, 11Ca, 11Da, 11Ea, 11Fa, 11Ga, 11Ha, 11Ia… One end (one end of the intermediate film) 11b, 11Ab, 11Bb, 11Cb, 11Db, 11Eb, 11Fb, 11Gb, 11Hb, 11Ib… The other end (the other end of the intermediate film) 21...First laminated glass member 22...Second laminated glass member 31, 31A, 31B, 31C, 31D, 31E, 31F, 31G, 31H, 31I...Laminated glass 31a, 31Aa, 31Ba, 31Ca, 31Da, 31Ea, 31Fa, 31Ga, 31Ha, 31Ia...One end (one end of laminated glass) 31b, 31Ab, 31Bb, 31Cb, 31Db, 31Eb, 31Fb, 31Gb, 31Hb, 31Ib...other end (other end of laminated glass) Q...Coloring agent R…Colored area RX...Gradation area RY...First non-gradation area RZ: Second non-gradation area

Claims

1. An interlayer film for laminated glass having one end and another end opposite to the one end, When the interlayer film is placed between two sheets of clear glass conforming to JIS R3202:1996 to obtain laminated glass X, the interlayer film has a colored region that has a visible light transmittance of the laminated glass X of 1% or more and 50% or less, The planar area of ​​the colored region is 95% or more of the total planar area of ​​the interlayer film (100%), a first visible light transmittance of the laminated glass X at a position 5 cm from the one end toward the other end of the interlayer film is smaller than a second visible light transmittance of the laminated glass X at a position 5 cm from the other end toward the one end of the interlayer film; the first visible light transmittance is 1% or more and 20% or less, the second visible light transmittance is 5% or more and 50% or less, an absolute value of the difference between the first visible light transmittance and the second visible light transmittance is 2% or more and 45% or less;

2. The interlayer film for laminated glass according to claim 1 , wherein the planar area of ​​the colored region is 100% of the total planar area of ​​the interlayer film.

3. 3. The interlayer film for laminated glass according to claim 1, wherein a maximum absolute value of a rate of change in visible light transmittance of the laminated glass X in the colored region from the one end side to the other end side of the interlayer film is 4.5% / mm or less.

4. the colored region has a first non-gradation region in which the visible light transmittance of the laminated glass X is uniform from the one end side to the other end side of the interlayer film, and a second non-gradation region in which the visible light transmittance of the laminated glass X is uniform from the one end side to the other end side of the interlayer film, The interlayer film for laminated glass according to any one of claims 1 to 3, wherein the first non-gradation region is located closer to the one end than the second non-gradation region.

5. 5. The interlayer film for laminated glass according to claim 4, wherein the weight ratio of the total content of the colorant contained in each layer of the interlayer film constituting the second non-gradation region to the total content of the colorant contained in each layer of the interlayer film constituting the first non-gradation region is 0.15 or more and 0.95 or less.

6. the colored region has a gradation region in which the visible light transmittance of the laminated glass X increases from the one end side to the other end side of the interlayer film, the first non-gradation area is located closer to the one end than the gradation area, The interlayer film for laminated glass according to claim 4 or 5, wherein the second non-gradation region is located closer to the other end than the gradation region.

7. The interlayer film for laminated glass according to any one of claims 1 to 3, wherein the colored region has only a gradation region in which the visible light transmittance of the laminated glass X increases from the one end side to the other end side of the interlayer film.

8. The interlayer film for laminated glass according to any one of claims 1 to 7, wherein at least one layer of the interlayer film constituting the colored region contains heat-shielding particles.

9. The interlayer film for laminated glass according to any one of claims 1 to 8, which is used for rear glass, roof glass, or rear-roof integrated glass.

10. a first laminated glass member; a second laminated glass member; and and the interlayer film for laminated glass according to any one of claims 1 to 9, The laminated glass, wherein the interlayer film for laminated glass is disposed between the first laminated glass member and the second laminated glass member.

11. A laminated glass having one end and another end opposite to the one end, a first laminated glass member; a second laminated glass member; and an intermediate film; the interlayer film is disposed between the first laminated glass member and the second laminated glass member; A colored region has a visible light transmittance of 1% or more and 50% or less, The planar area of ​​the colored region is 95% or more of the total planar area of ​​the laminated glass (100%), a first visible light transmittance at a position 5 cm from the one end toward the other end is smaller than a second visible light transmittance at a position 5 cm from the other end toward the one end; the first visible light transmittance is 1% or more and 20% or less, the second visible light transmittance is 5% or more and 50% or less, The laminated glass, wherein the absolute value of the difference between the first visible light transmittance and the second visible light transmittance is 2% or more and 45% or less.

12. The laminated glass according to claim 10 or 11, wherein the planar area of ​​the colored region is 100% of the total planar area of ​​the laminated glass.

13. 13. The laminated glass according to claim 10, wherein a maximum absolute value of a rate of change in visible light transmittance in the colored region from the one end side to the other end side is 4.5% / mm or less.

14. the colored region has a first non-gradation region in which the visible light transmittance is uniform from the one end side to the other end side, and a second non-gradation region in which the visible light transmittance is uniform from the one end side to the other end side, The laminated glass according to any one of claims 10 to 13, wherein the first non-gradation region is located closer to the one end than the second non-gradation region.

15. the colored region has a gradation region in which the visible light transmittance increases from the one end side to the other end side, the first non-gradation area is located closer to the one end than the gradation area, The laminated glass according to claim 14 , wherein the second non-gradation region is located closer to the other end than the gradation region.

16. The laminated glass according to any one of claims 10 to 13, wherein the colored region has only a gradation region in which the visible light transmittance increases from the one end side to the other end side.

Images