JP7100975B2 - Laminated glass - Google Patents

Description

The present invention relates to laminated glass using an interlayer film.

Laminated glass is generally excellent in safety because the amount of scattered glass fragments is small even if it is damaged by an external impact. Therefore, the laminated glass is widely used in automobiles, railroad vehicles, aircraft, ships, buildings and the like. The laminated glass is manufactured by sandwiching an interlayer film for laminated glass between a pair of glass plates.

Further, a head-up display (HUD) is known as the laminated glass used in an automobile. In the HUD, measurement information such as speed, which is the traveling data of the automobile, can be displayed on the windshield of the automobile, and the driver can recognize that the display is projected in front of the windshield.

In the above HUD, there is a problem that the measurement information and the like appear to be duplicated.

A wedge-shaped interlayer film is used to suppress the double image. The following Patent Document 1 discloses a laminated glass in which a wedge-shaped interlayer film having a predetermined wedge angle is sandwiched between a pair of glass plates. In such laminated glass, by adjusting the wedge angle of the interlayer film, the display of the measurement information reflected by one glass plate and the display of the measurement information reflected by another glass plate can be displayed from the driver's point of view. It can be tied to one point. Therefore, it is difficult to see the measurement information twice, and it is difficult to obstruct the driver's field of vision.

Further, Patent Document 2 below discloses a laminated glass in which a rectangular interlayer film is sandwiched between a wedge-shaped glass plate and a rectangular glass plate. Further, Patent Document 2 also discloses laminated glass in which a rectangular interlayer film is sandwiched between a wedge-shaped glass plate and a wedge-shaped glass plate.

Special Table No. 4-502525 Gazette WO2017 / 090561A1

In the HUD, it is desired that multiple images do not occur in the display area such as measurement information. The multiple image is a phenomenon in which a multiple image is observed by, for example, irradiating information from an information display device.

Strict control of the wedge angle of the laminated glass is important to suppress the multiple image of the HUD.

Conventionally, in order to suppress multiple images, the wedge angle of the wedge-shaped interlayer film used for the laminated glass is adjusted, or the wedge angle of the wedge-shaped glass plate used for the laminated glass is adjusted.

However, since the interlayer film is softer than the glass plate, the surface shape of the interlayer film changes to some extent along the glass plate at the time of bonding. Therefore, even if the wedge angle of the interlayer film before the production of the laminated glass is controlled with high accuracy, the wedge angle of the interlayer film may change in the obtained laminated glass. On the other hand, there is a limit to the change in the surface shape of the interlayer film during bonding, and if the surface shape of the interlayer film does not change sufficiently, the glass plate may be excessively curved along the surface shape of the interlayer film. There is. As a result, the accuracy of the wedge angle in the laminated glass is reduced. As a result, the multiple image may not be sufficiently suppressed.

An object of the present invention is to provide a laminated glass capable of suppressing multiple images.

According to a broad aspect of the present invention, it is a laminated glass that is a head-up display, has a display area of the head-up display, and has one end and the other end having a thickness larger than the one end on the opposite side of the one end. The first laminated glass member, the second laminated glass member, and the interlayer film arranged between the first laminated glass member and the second laminated glass member are provided. The laminated glass member of 1 has a wedge angle of 0.10 mrad or more, the thickness of the first laminated glass member is 2.03 mm or more in the center of the display area, and the laminated glass member is said to be in the center of the display area. A laminated glass is provided in which the ratio of the thickness of the first laminated glass member to the thickness of the interlayer film is 2.30 or more.

In a specific aspect of the laminated glass according to the present invention, the wedge angle of the first laminated glass member is larger than the wedge angle of the interlayer film.

In a specific aspect of the laminated glass according to the present invention, the wedge angle of the first laminated glass member is 0.10 mrad or more larger than the wedge angle of the interlayer film.

In certain aspects of the laminated glass according to the present invention, the interlayer film has a wedge angle of less than 0.10 mrad.

In certain aspects of the laminated glass according to the present invention, the laminated glass has a wedge angle of 0.10 mrad or more.

In a specific aspect of the laminated glass according to the present invention, the second laminated glass member has a wedge angle of 0.10 mrad or more.

In certain aspects of the laminated glass according to the present invention, the interlayer film comprises a thermoplastic resin.

In certain aspects of the laminated glass according to the present invention, the interlayer film comprises a plasticizer.

In certain aspects of the laminated glass according to the present invention, the interlayer includes a first layer and a second layer arranged on the first surface side of the first layer.

In certain aspects of the laminated glass according to the present invention, the interlayer includes a third layer arranged on the second surface side opposite to the first surface of the first layer.

The laminated glass according to the present invention is a laminated glass that is a head-up display, and has a display area of the head-up display. The laminated glass according to the present invention has one end and an other end having a thickness larger than that of the one end on the opposite side of the one end. The laminated glass according to the present invention comprises a first laminated glass member, a second laminated glass member, and an interlayer film arranged between the first laminated glass member and the second laminated glass member. Be prepared. In the laminated glass according to the present invention, the first laminated glass member has a wedge angle of 0.10 mrad or more. In the laminated glass according to the present invention, the thickness of the first laminated glass member is 2.03 mm or more in the center of the display area. In the laminated glass according to the present invention, the ratio of the thickness of the first laminated glass member to the thickness of the interlayer film is 2.30 or more in the center of the display area. Since the laminated glass according to the present invention has the above-mentioned configuration, multiple images can be suppressed.

1 (a) and 1 (b) are a sectional view and a front view schematically showing the laminated glass which concerns on 1st Embodiment of this invention. FIG. 2 is a sectional view schematically showing a laminated glass according to a second embodiment of the present invention. FIG. 3 is a sectional view schematically showing a laminated glass according to a third embodiment of the present invention. FIG. 4 is a sectional view schematically showing a laminated glass according to a fourth embodiment of the present invention. 5 (a) and 5 (b) are a cross-sectional view and a front view schematically showing a laminated glass according to a fifth embodiment of the present invention. FIG. 6 is a sectional view schematically showing a laminated glass according to a sixth embodiment of the present invention. FIG. 7 is a sectional view schematically showing a laminated glass according to a seventh embodiment of the present invention. FIG. 8 is a sectional view schematically showing a laminated glass according to an eighth embodiment of the present invention.

Hereinafter, the present invention will be described in detail.

The laminated glass according to the present invention is a laminated glass which is a head-up display. The laminated glass according to the present invention has a display area of a head-up display. The laminated glass according to the present invention has one end and an other end having a thickness larger than that of the one end on the opposite side of 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. In the laminated glass according to the present invention, the interlayer film is arranged between the first laminated glass member and the second laminated glass member.

The interlayer film has, for example, a display-corresponding area corresponding to a display area of a head-up display. The display-corresponding area is an area in which information can be displayed satisfactorily. The interlayer film is used for a laminated glass which is a head-up display (HUD). The interlayer film is an interlayer film for HUD.

In the laminated glass according to the present invention, the first laminated glass member has a wedge angle of 0.10 mrad or more. In the laminated glass according to the present invention, the thickness of the first laminated glass member is 2.03 mm or more in the center of the display area. In the laminated glass according to the present invention, the ratio of the thickness of the first laminated glass member to the thickness of the interlayer film (thickness of the first laminated glass member / thickness of the interlayer film) is determined in the center of the display area. 2.30 or more.

The first laminated glass member has one end and the other end on the opposite side of the one end. The one end and the other end are both end portions facing each other in the first laminated glass member. In the first laminated glass member, the thickness of the other end is larger than the thickness of the one end.

The second laminated glass member has one end and the other end on the opposite side of the one end. The one end and the other end are both end portions facing each other in the second laminated glass member.

The laminated glass has one end and the other end on the opposite side of the one end. The one end and the other end are both end portions facing each other in the laminated glass. In the laminated glass, the thickness of the other end is larger than the thickness of the one end.

The interlayer film has one end and the other end on the opposite side of the one end. The one end and the other end are both end portions facing each other in the interlayer film.

One end of the first laminated glass member, the second laminated glass member, and the interlayer film is one end side of the laminated glass. The other end of the first laminated glass member, the second laminated glass member, and the interlayer film is the other end side of the laminated glass.

In the present invention, since the above configuration is provided, multiple images can be suppressed. In particular, the first laminated glass member has a wedge angle of 0.10 mrad or more, and the thickness of the first laminated glass member is 2.03 mm or more in the center of the display area, and the thickness of the first laminated glass member is 2.03 mm or more. At the center, the ratio (thickness of the first laminated glass member / thickness of the interlayer film) is 2.30 or more, so that multiple images can be suppressed. In the present invention, the generation of multiple images is considerably suppressed when the display information is reflected from the display unit on the laminated glass.

In the above laminated glass, measurement information such as speed transmitted from the control unit can be projected on the windshield from the display unit of the instrumental panel. Therefore, the driver of the automobile can visually recognize the front field of view and the measurement information at the same time without lowering the field of view.

In the present invention, in the center of the display area, the thickness of the first laminated glass member itself is relatively thick and the thickness of the first laminated glass member is relatively thicker than the thickness of the interlayer film. Occasionally, the interlayer can be well aligned with the first laminated glass member.

Further, in the present invention, at the center of the display area, the thickness of the first laminated glass member itself is relatively thick, and the thickness of the first laminated glass member is relatively thicker than the thickness of the interlayer film. Excessive bending of the first laminated glass member can be suppressed during the production of glass.

As a result, in the present invention, multiple images in laminated glass can be effectively suppressed.

The thickness of the first laminated glass member is 2.03 mm or more. From the viewpoint of further suppressing the multiplex image and enhancing the penetration resistance, the thickness of the first laminated glass member is preferably 2.10 mm or more, more preferably 2.15 mm or more. From the viewpoint of weight reduction, the thickness of the first laminated glass member is preferably 2.4 mm or less, more preferably 2.30 mm or less.

In the center of the display area, the ratio (thickness of the first laminated glass member / thickness of the interlayer film) is 2.30 or more. From the viewpoint of further suppressing the multiplex image, the above ratio (thickness of the first laminated glass member / thickness of the interlayer film) is preferably 2.5 or more, more preferably 2.7 or more. From the viewpoint of weight reduction, the above ratio (thickness of the first laminated glass member / thickness of the interlayer film) is preferably 3.0 or less, more preferably 2.8 or less.

The first laminated glass member is a wedge-shaped laminated glass member.

The "wedge angle" in the first laminated glass member having a wedge angle of 0.10 mrad or more means the wedge angle of the entire first laminated glass member.

The second laminated glass member may have a wedge angle of 0.10 mrad or more, or may have a wedge angle of less than 0.10 mrad. The second laminated glass member may be a wedge-shaped laminated glass member or a rectangular laminated glass member.

The "wedge angle" in the second laminated glass member means the wedge angle of the entire second laminated glass member.

The interlayer film may have a wedge angle of 0.10 mrad or more, or may have a wedge angle of less than 0.10 mrad. The interlayer film may be a wedge-shaped interlayer film or a rectangular interlayer film. From the viewpoint of further suppressing the multiplex image, the interlayer film preferably has a wedge angle of less than 0.10 mrad, and is preferably a rectangular interlayer film.

From the viewpoint of further suppressing the multiple image, the wedge angle of the first laminated glass member is preferably larger than the wedge angle of the interlayer film. From the viewpoint of further suppressing the multiple image, the wedge angle of the first laminated glass member is preferably 0.05 mrad or more, more preferably 0.10 mrad or more, and further preferably larger than the wedge angle of the interlayer film. Is greater than 0.15 mrad, particularly preferably greater than 0.20 mrad, and most preferably greater than 0.25 mrad.

From the viewpoint of further suppressing the multiple image, the wedge angle of the second laminated glass member is preferably larger than the wedge angle of the interlayer film. From the viewpoint of further suppressing the multiple image, the wedge angle of the second laminated glass member is preferably 0.05 mrad or more, more preferably 0.10 mrad or more, and further preferably larger than the wedge angle of the interlayer film. Is greater than 0.15 mrad, particularly preferably greater than 0.20 mrad, and most preferably greater than 0.25 mrad.

The interlayer film according to the present invention and the interlayer film in the laminated glass according to the present invention have a one-layer structure or two or more layers. The interlayer film may have a structure of one layer or may have a structure of two or more layers. The interlayer film may have a structure of two layers or may have a structure of three or more layers. The interlayer film may be a single-layer interlayer film or a multilayer interlayer film.

The wedge angle of the first laminated glass member is 0.10 mrad or more. From the viewpoint of further suppressing the multiple image in the present invention, the wedge angle of the first laminated glass member is preferably 0.15 mrad or more, more preferably 0.20 mrad or more, still more preferably 0.25 mrad or more, preferably 0.25 mrad or more. Is 2.0 mad or less, more preferably 1.5 mad or less.

The wedge angle of the second laminated glass member is 0 mrad or more (not wedge-shaped when 0 mrad). From the viewpoint of further suppressing the multiple image in the present invention, the wedge angle of the second laminated glass member is preferably 0 mrad or more, more preferably 0.10 mrad or more, still more preferably 0.15 mrad or more, and particularly preferably 0.15 mrad or more. It is 0.20 mrad or more, most preferably 0.25 mrad or more. From the viewpoint of further suppressing the multiple image in the present invention, the wedge angle of the second laminated glass member is preferably 2.0 mrad or less, more preferably 1.5 mrad or less.

The wedge angle of the interlayer film is 0 mrad or more (not wedge-shaped when 0 mrad). The wedge angle of the interlayer film is preferably 0 mrad or more, preferably less than 2.0 mrad, and more preferably less than 1.5 mrad. From the viewpoint of further enhancing the multiple image, the wedge angle of the interlayer film is preferably less than 0.10 mrad, more preferably 0.50 mrad or less, still more preferably 0.03 mrad or less. The wedge angle of the interlayer film may be 0 mrad (not wedge-shaped when 0 mrad), may exceed 0 mrad, may be 0.03 mrad or more, or may be 0.05 mrad or more. ..

From the viewpoint of further suppressing multiple images in the present invention, the wedge angle of the laminated glass is preferably 0.10 mrad or more, more preferably 0.15 mrad or more, still more preferably 0.20 mrad or more, and most preferably 0. It is 25 mad or more, preferably 2.0 mad or less, and more preferably 1.5 mad or less.

From the viewpoint of obtaining a laminated glass suitable for a vehicle having a large windshield mounting angle such as a truck or a bus, the wedge angle of the laminated glass is preferably 0.10 mrad or more, more preferably 0.15 mrad or more, and further preferably 0. .20 mrad or more, particularly preferably 0.25 mrad or more.

From the viewpoint of obtaining a laminated glass suitable for a car having a small mounting angle of a windshield such as a sports car, the wedge angle of the laminated glass is preferably 0.9 mrad or less, more preferably 0.8 mrad or less.

The wedge angle θ of the laminated glass is a straight line connecting the first surface (one surface) portion of the laminated glass between the maximum thickness portion and the minimum thickness portion of the laminated glass, and the maximum thickness portion and the minimum thickness portion of the laminated glass. It is an internal angle at the intersection with the straight line connecting the second surface (the other surface) portion of the laminated glass. When there are a plurality of maximum thickness portions, a plurality of minimum thickness portions, a maximum thickness portion is in a constant region, or a minimum thickness portion is in a constant region, the maximum thickness portion for obtaining the wedge angle θ is obtained. And the minimum thickness portion is selected so that the required wedge angle θ is the largest. The wedge angle of the first laminated glass member, the second laminated glass member, and the interlayer film can be determined in the same manner as the wedge angle of the laminated glass.

The wedge angle in the completely rectangular laminated glass member and the completely rectangular interlayer film is 0 mrad. The angle of 0 mrad when it is not a wedge-shaped laminated glass member and the angle of 0 mrad when it is not a wedge-shaped interlayer film are also referred to as a wedge angle.

From the viewpoint of enhancing the transparency of the laminated glass, the visible light transmittance of the laminated glass is preferably 65% or more, more preferably 70% or more, further preferably 71% or more, particularly preferably 72% or more, and most preferably. Is 72.5% or more.

The visible light transmittance is measured at a position of 20 cm from the other end to one end of the laminated glass.

From the viewpoint of further suppressing the multiplex image and enhancing the penetration resistance, the thickness of the laminated glass is preferably 2.1 mm or more, more preferably 2.15 mm or more. From the viewpoint of weight reduction, the thickness of the laminated glass is preferably 2.4 mm or less, more preferably 2.3 mm or less.

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

1 (a) and 1 (b) are a sectional view and a front view schematically showing the laminated glass which concerns on 1st Embodiment of this invention. FIG. 1 (a) is a cross-sectional view taken along the line I-I in FIG. 1 (b). FIG. 2 is a sectional view schematically showing a laminated glass according to a second embodiment of the present invention. FIG. 3 is a sectional view schematically showing a laminated glass according to a third embodiment of the present invention. FIG. 4 is a sectional view schematically showing a laminated glass according to a fourth embodiment of the present invention.

The size and dimensions of the laminated glass in FIGS. 1 (a), 1 (b), 2, 3, 4, and later figures are appropriately changed from the actual size and shape for convenience of illustration. ing. In FIGS. 1 (a), 1 (b), 2, 2, 3, 4, and later figures, for convenience of illustration, the thickness of the laminated glass and each member constituting the laminated glass, and the wedge angle (θ) are shown. , Actual thickness and wedge angle are shown to be different. Actually, in the laminated glass of the embodiment, the above ratio (thickness of the first laminated glass member / thickness of the interlayer film) is 2.30 or more. In addition, in FIG. 1 (a), FIG. 1 (b), FIG. 2, FIG. 3, FIG. 4, and the figure described later, different parts can be replaced with each other.

The laminated glass 11 is shown in FIGS. 1 (a) and 1 (b). FIG. 2 shows a laminated glass 11A. FIG. 3 shows a laminated glass 11B. FIG. 4 shows a laminated glass 11C.

The laminated glass 11, 11A, 11B, 11C has one end 11a and the other end 11b on the opposite side of the one end 11a. One end 11a and the other end 11b are both end portions facing each other. The thickness of the other end 11b of the laminated glass 11, 11A, 11B, 11C is larger than the thickness of one end 11a. Therefore, the laminated glass 11, 11A, 11B, 11C has a thin region and a thick region.

Laminated glasses 11, 11A, 11B, 11C are head-up displays. The laminated glass 11, 11A, 11B, 11C has a display area R1 of the head-up display.

The laminated glass 11, 11A, 11B, 11C has a peripheral region R2 next to the display region R1.

The laminated glass 11, 11A, 11B, 11C has a shade region R3 apart from the display region R1. The shade region R3 is located at the edge of the laminated glass 11, 11A, 11B, 11C.

The laminated glass 11 shown in FIGS. 1A and 1B includes a first laminated glass member 2, an interlayer film 1, and a second laminated glass member 3. The first laminated glass member 2, the interlayer film 1, and the second laminated glass member 3 are arranged side by side in this order. The interlayer film 1 is arranged between the first laminated glass member 2 and the second laminated glass member 3.

The interlayer film 1 is a multi-layered interlayer film having a structure of two or more layers. Specifically, the interlayer film 1 has a three-layer structure. The interlayer film 1 includes a second layer 22, a first layer 21, and a third layer 23. The second layer 22, the first layer 21, and the third layer 23 are arranged side by side in this order. The first layer 21 is arranged between the second layer 22 and the third layer 23. The second layer 22 is arranged on the first surface side of the first layer 21. The third layer 23 is arranged on the second surface side of the first layer 21 opposite to the first surface.

The first laminated glass member 2 is wedge-shaped and has a wedge angle of 0.10 mrad or more. The second laminated glass member 3 is wedge-shaped and has a wedge angle of 0.10 mrad or more. The interlayer film 1 is rectangular and has a wedge angle of less than 0.10 mrad. The first layer 21, the second layer 22, and the third layer 23 are rectangular and have a wedge angle of less than 0.10 mrad. At the center of the display area R1, the thickness of the first laminated glass member 2 is 2.03 mm or more. In the center of the display region R1, the above ratio (thickness of the first laminated glass member 2 / thickness of the interlayer film 1) is 2.30 or more.

The laminated glass 11A shown in FIG. 2 includes a first laminated glass member 2A, an interlayer film 1A, and a second laminated glass member 3A. The first laminated glass member 2A, the interlayer film 1A, and the second laminated glass member 3A are arranged side by side in this order. The interlayer film 1A is arranged between the first laminated glass member 2A and the second laminated glass member 3A.

The interlayer film 1A is a multi-layered interlayer film having a structure of two or more layers. Specifically, the interlayer film 1A has a three-layer structure. The interlayer film 1A includes a second layer 22A, a first layer 21A, and a third layer 23A. The second layer 22A, the first layer 21A, and the third layer 23A are arranged side by side in this order. The first layer 21A is arranged between the second layer 22A and the third layer 23A. The second layer 22A is arranged on the first surface side of the first layer 21A. The third layer 23A is arranged on the second surface side of the first layer 21A opposite to the first surface.

The first laminated glass member 2A is wedge-shaped and has a wedge angle of 0.10 mrad or more. The interlayer film 1A and the second laminated glass member 3A are rectangular and have a wedge angle of less than 0.10 mrad. The first layer 21A, the second layer 22A and the third layer 23A are rectangular and have a wedge angle of less than 0.10 mrad. At the center of the display area R1, the thickness of the first laminated glass member 2A is 2.03 mm or more. At the center of the display region R1, the above ratio (thickness of the first laminated glass member 2A / thickness of the interlayer film 1A) is 2.30 or more.

The laminated glass 11B shown in FIG. 3 includes a first laminated glass member 2B, an interlayer film 1B, and a second laminated glass member 3B. The first laminated glass member 2B, the interlayer film 1B, and the second laminated glass member 3B are arranged side by side in this order. The interlayer film 1B is arranged between the first laminated glass member 2B and the second laminated glass member 3B.

The interlayer film 1B is a multi-layered interlayer film having a structure of two or more layers. Specifically, the interlayer film 1B has a three-layer structure. The interlayer film 1B includes a second layer 22B, a first layer 21B, and a third layer 23B. The second layer 22B, the first layer 21B, and the third layer 23B are arranged side by side in this order. The first layer 21B is arranged between the second layer 22B and the third layer 23B. The second layer 22B is arranged on the first surface side of the first layer 21B. The third layer 23B is arranged on the second surface side of the first layer 21B opposite to the first surface.

The first laminated glass member 2B is wedge-shaped and has a wedge angle of 0.10 mrad or more. The second laminated glass member 3B is wedge-shaped and has a wedge angle of 0.10 mrad or more. The interlayer film 1B has a wedge angle exceeding 0 mrad. The first layer 21B is rectangular and has a wedge angle of less than 0.10 mrad. The second layer 22B and the third layer 23B have a wedge angle of more than 0 mrad. At the center of the display area R1, the thickness of the first laminated glass member 2B is 2.03 mm or more. At the center of the display region R1, the above ratio (thickness of the first laminated glass member 2B / thickness of the interlayer film 1B) is 2.30 or more.

The laminated glass 11C shown in FIG. 4 includes a first laminated glass member 2C, an interlayer film 1C, and a second laminated glass member 3C. The first laminated glass member 2C, the interlayer film 1C, and the second laminated glass member 3C are arranged side by side in this order. The interlayer film 1C is arranged between the first laminated glass member 2C and the second laminated glass member 3C.

The interlayer film 1C is a multi-layered interlayer film having a structure of two or more layers. Specifically, the interlayer film 1C has a three-layer structure. The interlayer film 1C includes a second layer 22C, a first layer 21C, and a third layer 23C. The second layer 22C, the first layer 21C, and the third layer 23C are arranged side by side in this order. The first layer 21C is arranged between the second layer 22C and the third layer 23C. The second layer 22C is arranged on the first surface side of the first layer 21C. The third layer 23C is arranged on the second surface side of the first layer 21C opposite to the first surface.

The first laminated glass member 2C is wedge-shaped and has a wedge angle of 0.10 mrad or more. The second laminated glass member 3C is rectangular and has a wedge angle of less than 0.10 mrad. The interlayer film 1C has a wedge angle exceeding 0 mrad. The first layer 21C and the third layer 23C are rectangular and have a wedge angle of less than 0.10 mrad. The second layer 22C has a wedge angle of more than 0 mrad. At the center of the display area R1, the thickness of the first laminated glass member 2C is 2.03 mm or more. In the center of the display region R1, the above ratio (thickness of the first laminated glass member 2C / thickness of the interlayer film 1C) is 2.30 or more.

5 (a) and 5 (b) are a cross-sectional view and a front view schematically showing a laminated glass according to a fifth embodiment of the present invention. 5 (a) is a cross-sectional view taken along the line I-I in FIG. 5 (b). FIG. 6 is a sectional view schematically showing a laminated glass according to a sixth embodiment of the present invention. FIG. 7 is a sectional view schematically showing a laminated glass according to a seventh embodiment of the present invention. FIG. 8 is a sectional view schematically showing a laminated glass according to an eighth embodiment of the present invention.

5 (a) and 5 (b) show the laminated glass 11D. FIG. 6 shows a laminated glass 11E. FIG. 7 shows the laminated glass 11F. FIG. 8 shows a laminated glass 11G.

The laminated glass 11D, 11E, 11F, 11G has one end 11a and the other end 11b on the opposite side of the one end 11a. One end 11a and the other end 11b are both end portions facing each other. The thickness of the other end 11b of the laminated glass 11D, 11E, 11F, 11G is larger than the thickness of one end 11a. Therefore, the laminated glass 11D, 11E, 11F, 11G has a thin region and a thick region.

The laminated glass 11D, 11E, 11F, 11G are head-up displays. The laminated glass 11D, 11E, 11F, 11G has a display area R1 of the head-up display.

The laminated glass 11D, 11E, 11F, 11G has a peripheral region R2 next to the display region R1.

The laminated glass 11D, 11E, 11F, 11G has a shade region R3 apart from the display region R1. The shade region R3 is located at the edge of the laminated glass 11D, 11E, 11F, 11G.

The laminated glass 11D shown in FIGS. 5A and 5B includes a first laminated glass member 2D, an interlayer film 1D, and a second laminated glass member 3D. The first laminated glass member 2D, the interlayer film 1D, and the second laminated glass member 3D are arranged side by side in this order. The interlayer film 1D is arranged between the first laminated glass member 2D and the second laminated glass member 3D.

The interlayer film 1D is a single-layer interlayer film having a one-layer structure.

The first laminated glass member 2D is wedge-shaped and has a wedge angle of 0.10 mrad or more. The second laminated glass member 3D is wedge-shaped and has a wedge angle of 0.10 mrad or more. The interlayer film 1D is rectangular and has a wedge angle of less than 0.10 mrad. At the center of the display area R1, the thickness of the first laminated glass member 2D is 2.03 mm or more. At the center of the display region R1, the above ratio (thickness of the first laminated glass member 2D / thickness of the interlayer film 1D) is 2.30 or more.

The laminated glass 11E shown in FIG. 6 includes a first laminated glass member 2E, an interlayer film 1E, and a second laminated glass member 3E. The first laminated glass member 2E, the interlayer film 1E, and the second laminated glass member 3E are arranged side by side in this order. The interlayer film 1E is arranged between the first laminated glass member 2E and the second laminated glass member 3E.

The interlayer film 1E is a single-layer interlayer film having a one-layer structure.

The first laminated glass member 2E is wedge-shaped and has a wedge angle of 0.10 mrad or more. The interlayer film 1E and the second laminated glass member 3E are rectangular and have a wedge angle of less than 0.10 mrad. At the center of the display area R1, the thickness of the first laminated glass member 2E is 2.03 mm or more. In the center of the display region R1, the above ratio (thickness of the first laminated glass member 2E / thickness of the interlayer film 1E) is 2.30 or more.

The laminated glass 11F shown in FIG. 7 includes a first laminated glass member 2F, an interlayer film 1F, and a second laminated glass member 3F. The first laminated glass member 2F, the interlayer film 1F, and the second laminated glass member 3F are arranged side by side in this order. The interlayer film 1F is arranged between the first laminated glass member 2F and the second laminated glass member 3F.

The interlayer film 1F is a single-layer interlayer film having a one-layer structure.

The first laminated glass member 2F is wedge-shaped and has a wedge angle of 0.10 mrad or more. The second laminated glass member 3F is wedge-shaped and has a wedge angle of 0.10 mrad or more. The interlayer film 1F has a wedge angle exceeding 0 mrad. At the center of the display area R1, the thickness of the first laminated glass member 2F is 2.03 mm or more. At the center of the display region R1, the above ratio (thickness of the first laminated glass member 2F / thickness of the interlayer film 1F) is 2.30.

The laminated glass 11G shown in FIG. 8 includes a first laminated glass member 2G, an interlayer film 1G, and a second laminated glass member 3G. The first laminated glass member 2G, the interlayer film 1G, and the second laminated glass member 3G are arranged side by side in this order. The interlayer film 1G is arranged between the first laminated glass member 2G and the second laminated glass member 3G.

The interlayer film 1G is a single-layer interlayer film having a one-layer structure.

The first laminated glass member 2G is wedge-shaped and has a wedge angle of 0.10 mrad or more. The second laminated glass member 3G is rectangular and has a wedge angle of less than 0.10 mrad. The interlayer film 1G has a wedge angle exceeding 0 mrad. At the center of the display area R1, the thickness of the first laminated glass member 2G is 2.03 mm or more. In the center of the display region R1, the above ratio (thickness of the first laminated glass member 2G / thickness of the interlayer film 1G) is 2.30 or more.

From the viewpoint of suppressing the multiple image more effectively, the laminated glass is from a position of 6 cm from one end to the other end to a position of 63.8 cm from one end (thin side) to the other end. It is preferable to have the display area in the area of. The display area may be present in a part of the area from the position of 6 cm from one end to the other end to the position of 63.8 cm from one end to the other end, and is present as a whole. You may be doing it.

The laminated glass preferably has a portion having a wedge-shaped cross-sectional shape in the thickness direction. It is preferable that the cross-sectional shape of the display area in the thickness direction is wedge-shaped. Whether or not it is wedge-shaped or rectangular can be determined by the cross-sectional shape in the thickness direction.

From the viewpoint of effectively suppressing the multiplex image, the laminated glass is formed in the thickness direction in the region from the position of 6 cm from the one end to the other end to the position of 63.8 cm from the one end to the other end. It is preferable to have a portion having a wedge-shaped cross-sectional shape. The portion having a wedge-shaped cross-sectional shape in the thickness direction may be present in a part of the region up to the position of 63.8 cm from one end to the other end, or may be present in the whole region.

The interlayer film and the laminated glass may have a shade region. The shade area may be separated from the display corresponding area. The shade area is provided for the purpose of preventing the driver from feeling glare while driving, for example, due to sunlight, outdoor lighting, or the like. The shade area may be provided to impart heat shielding properties. The shade region is preferably located at the edge of the interlayer film or laminated glass. The shade region is preferably strip-shaped.

In the shade area, colorants or fillers may be used to change the color and visible light transmittance. The colorant or filler may be contained only in a part of the thickness direction of the interlayer film, or may be contained in the entire area of the interlayer film or the laminated glass in the thickness direction.

From the viewpoint of further improving the display and further expanding the field of view, the visible light transmittance of the display corresponding area and the display area is preferably 80% or more, more preferably 88% or more, still more preferably 90% or more. be. It is preferable that the visible light transmittance of the display corresponding area and the display area is higher than the visible light transmittance of the shade area. The visible light transmittance of the display corresponding area and the display area may be lower than the visible light transmittance of the shade area. The visible light transmittance of the display corresponding region and the display area is preferably 50% or more higher, more preferably 60% or more higher than the visible light transmittance of the shade region.

For example, when the visible light transmittance changes in the display-compatible area, the display area, and the shade area, the visible light transmittance is visible at the center position of the display-compatible area, the intermediate position of the display area, and the center position of the shade area. Light transmittance is measured.

The visible light transmittance at 380 to 780 nm can be measured using a spectrophotometer (“U-4100” manufactured by Hitachi High-Tech) in accordance with JIS R3211 (1998).

The display-corresponding area and the display area preferably have a length direction and a width direction. Since the interlayer film and the laminated glass are excellent in versatility, it is preferable that the width direction of the display corresponding region and the display region is the direction connecting the one end and the other end. The display-corresponding area and the display area are preferably strip-shaped.

The interlayer film preferably has an MD direction and a TD direction. The interlayer film is obtained, for example, by melt extrusion molding. The MD direction is the flow direction of the interlayer film at the time of manufacturing the interlayer film. The TD direction is a direction orthogonal to the flow direction of the interlayer film at the time of manufacturing the interlayer film and a direction orthogonal to the thickness direction of the interlayer film. It is preferable that the one end and the other end are located on both sides in the TD direction.

Let X be the distance between one end and the other end. It is preferable that the laminated glass has a minimum thickness in a region of a distance of 0X to 0.2X from one end to the inside and a maximum thickness in a region of a distance of 0X to 0.2X from the other end to the inside. .. The laminated glass has a minimum thickness in a region of a distance of 0X to 0.1X from one end to the inside, and a maximum thickness in a region of a distance of 0X to 0.1X from the other end to the inside. preferable. It is preferable that the laminated glass has a minimum thickness at one end and the laminated glass has a maximum thickness at the other end.

The laminated glass may have a uniform thickness portion. The uniform thickness portion means that the thickness does not change by more than 10 μm per 10 cm distance range in the direction connecting the one end and the other end of the laminated glass. Therefore, the uniform thickness portion refers to a portion where the thickness does not change by more than 10 μm per 10 cm distance range in the direction connecting the one end and the other end of the laminated glass. Specifically, the thickness of the uniform thickness portion does not change at all in the direction connecting the one end and the other end of the laminated glass, or 10 cm in the direction connecting the one end and the other end of the laminated glass. It means a part where the thickness changes within 10 μm per distance range.

The distance X between one end and the other end of the laminated glass is preferably 3 m or less, more preferably 2 m or less, particularly preferably 1.5 m or less, preferably 0.5 m or more, more preferably 0.8 m or more, and particularly. It is preferably 1 m or more.

The interlayer film may be rolled into a roll to form an interlayer film. The roll body may include a winding core and an interlayer film. The interlayer film may be wound around the outer circumference of the winding core.

The method for producing the laminated glass is not particularly limited. For example, the interlayer film is sandwiched between the first and second laminated glass members and passed through a pressing roll, or put in a rubber bag and sucked under reduced pressure. As a result, the air remaining between the first laminated glass member and the interlayer film and between the second laminated glass member and the interlayer film is degassed. Then, it is pre-bonded at about 70 to 110 ° C. to obtain a laminated body. Next, the laminate is placed in an autoclave or pressed, and pressure-bonded at a pressure of about 120 to 150 ° C. and 1 to 1.5 MPa. In this way, laminated glass can be obtained.

The laminated glass can be used for automobiles, railroad vehicles, aircraft, ships, buildings and the like. The laminated glass is preferably a laminated glass for construction or a vehicle, and more preferably a laminated glass for a vehicle. The laminated glass can be used for other purposes. It is particularly preferable that the laminated glass is an automobile windshield.

Hereinafter, other details of each member constituting the laminated glass according to the present invention will be described.

(First and second laminated glass members)
Examples of the first and second laminated glass members include a glass plate and a PET (polyethylene terephthalate) film. The laminated glass includes not only laminated glass in which an intermediate layer is sandwiched between two glass plates, but also laminated glass in which an intermediate layer is sandwiched between a glass plate and a PET film or the like. The laminated glass is a laminated body provided with a glass plate, and it is preferable that at least one glass plate is used. The first and second laminated glass members are glass plates or PET (polyethylene terephthalate) films, respectively, and the laminated glass includes at least one glass plate as the first and second laminated glass members. Is preferable. It is particularly preferable that both the first and second laminated glass members are glass plates.

Examples of the glass plate include inorganic glass and organic glass. Examples of the inorganic glass include float plate glass, heat ray absorbing plate glass, heat ray reflecting plate glass, polished plate glass, template glass, meshed plate glass, wire-reinforced plate glass, and green glass. The organic glass is a synthetic resin glass that is a substitute for inorganic glass. Examples of the organic glass include a polycarbonate plate and a poly (meth) acrylic resin plate. Examples of the poly (meth) acrylic resin plate include a polymethyl (meth) acrylate plate.

It is preferable that the first laminated glass member and the second laminated glass member are clear glass or heat ray absorbing plate glass, respectively. The heat ray absorbing plate glass is preferably green glass. The heat ray absorbing plate glass is a heat ray absorbing plate glass conforming to JIS R3208.

(Intermediate membrane)
Let T be the thickness of the interlayer film. The thickness of the first layer is preferably 0.035 T or more, more preferably 0.0625 T or more, still more preferably 0.1 T or more, preferably 0.4 T or less, still more preferably 0.375 T or less, still more preferably. It is 0.25T or less, particularly preferably 0.15T or less. When the thickness of the first layer is 0.4 T or less, the bending rigidity becomes even better.

The thickness of each of the second layer and the third layer is preferably 0.3 T or more, more preferably 0.3125 T or more, further preferably 0.375 T or more, preferably 0.97 T or less, and more preferably 0. It is .9375T or less, more preferably 0.9T or less. The thickness of each of the second layer and the third layer may be 0.46875 T or less, or may be 0.45 T or less. Further, when the thicknesses of the second layer and the third layer are not less than the lower limit and not more than the upper limit, the rigidity and sound insulation of the laminated glass are further increased.

The total thickness of the second layer and the third layer is preferably 0.625 T or more, more preferably 0.75 T or more, still more preferably 0.85 T or more, preferably 0.97 T or less, more preferably 0.97 T or less. It is 0.9375T or less, more preferably 0.9T or less. Further, when the total thickness of the second layer and the third layer is not less than the lower limit and not more than the upper limit, the rigidity and sound insulation of the laminated glass are further increased.

Thermoplastic resin:
The interlayer film preferably contains a thermoplastic resin (hereinafter, may be referred to as a thermoplastic resin (0)), and the thermoplastic resin (0) is preferably a polyvinyl acetal resin (hereinafter, polyvinyl acetal resin (0)). May be described). The first layer preferably contains a thermoplastic resin (hereinafter, may be referred to as a thermoplastic resin (1)), and as the thermoplastic resin (1), a polyvinyl acetal resin (hereinafter, a polyvinyl acetal resin (hereinafter, polyvinyl acetal resin)) is preferably contained. It may be described as 1)). The second layer preferably contains a thermoplastic resin (hereinafter, may be referred to as a thermoplastic resin (2)), and as the thermoplastic resin (2), a polyvinyl acetal resin (hereinafter, a polyvinyl acetal resin (hereinafter, polyvinyl acetal resin)) is preferably contained. It may be described as 2)). The third layer preferably contains a thermoplastic resin (hereinafter, may be referred to as a thermoplastic resin (3)), and as the thermoplastic resin (3), a polyvinyl acetal resin (hereinafter, a polyvinyl acetal resin (hereinafter, polyvinyl acetal resin)) is preferably contained. 3) may be described). The thermoplastic resin (1), the thermoplastic resin (2), and the thermoplastic resin (3) may be the same or different. It is preferable that the thermoplastic resin (1) is different from the thermoplastic resin (2) and the thermoplastic resin (3) because the sound insulation is further improved. The polyvinyl acetal resin (1), the polyvinyl acetal resin (2), and the polyvinyl acetal resin (3) may be the same or different. The polyvinyl acetal resin (1) is preferably different from the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) because the sound insulation property is further improved. Only one type of the above-mentioned thermoplastic resin (0), the above-mentioned thermoplastic resin (1), the above-mentioned thermoplastic resin (2), and the above-mentioned thermoplastic resin (3) may be used, or two or more types may be used in combination. You may. The polyvinyl acetal resin (0), the polyvinyl acetal resin (1), the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) may be used alone or in combination of two or more. You may.

Examples of the thermoplastic resin include polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, polyurethane resin, polyvinyl alcohol resin and the like. Thermoplastic resins other than these may be used.

The thermoplastic resin is preferably a polyvinyl acetal resin. The combined use of the polyvinyl acetal resin and the plasticizer further enhances the adhesive force of the layer containing the polyvinyl acetal resin and the plasticizer to the laminated glass member or other layers.

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

The average degree of polymerization of the polyvinyl alcohol (PVA) is preferably 200 or more, more preferably 500 or more, still more preferably 1500 or more, still more preferably 1600 or more, particularly preferably 2600 or more, most preferably 2700 or more, preferably 2700 or more. It is 5000 or less, more preferably 4000 or less, still more preferably 3500 or less. When the average degree of polymerization is at least the above lower limit, the penetration resistance of the laminated glass is further increased. When the average degree of polymerization is not more than the above upper limit, molding of the interlayer film becomes easy.

The average degree of polymerization of polyvinyl alcohol is determined by a method based on JIS K6726 "polyvinyl alcohol test method".

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

The above aldehyde is not particularly limited. Generally, an aldehyde having 1 to 10 carbon atoms is preferably used. Examples of the aldehyde having 1 to 10 carbon atoms include propionaldehyde, n-butylaldehyde, isobutylaldehyde, n-barrel aldehyde, 2-ethylbutylaldehyde, n-hexylaldehyde, n-octylaldehyde, and n-nonylaldehyde. , N-decylaldehyde, formaldehyde, acetaldehyde, benzaldehyde and the like. Propion aldehyde, n-butyl aldehyde, isobutyl aldehyde, n-hexyl aldehyde or n-barrel aldehyde are preferable, propion aldehyde, n-butyraldehyde or isobutyl aldehyde is more preferable, and n-butyl aldehyde is further preferable. Only one kind of the above aldehyde may be used, or two or more kinds may be used in combination.

The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (0) is preferably 15 mol% or more, more preferably 18 mol% or more, preferably 40 mol% or less, and more preferably 35 mol% or less. When the content of the hydroxyl group is at least the above lower limit, the adhesive strength of the interlayer film becomes even higher. Further, when the content of the hydroxyl group is not more than the above upper limit, the flexibility of the interlayer film is increased and the handling of the interlayer film becomes easy.

The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (1) is preferably 17 mol% or more, more preferably 20 mol% or more, still more preferably 22 mol% or more, preferably 28 mol% or less, more preferably. Is 27 mol% or less, more preferably 25 mol% or less, and particularly preferably 24 mol% or less. When the content of the hydroxyl group is at least the above lower limit, the mechanical strength of the interlayer film is further increased. In particular, when the content of the hydroxyl group of the polyvinyl acetal resin (1) is 20 mol% or more, the reaction efficiency is high and the productivity is excellent, and when it is 28 mol% or less, the sound insulation of the laminated glass is further improved. .. Further, when the content of the hydroxyl group is not more than the above upper limit, the flexibility of the interlayer film is increased and the handling of the interlayer film becomes easy.

The content of each hydroxyl group of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 25 mol% or more, more preferably 28 mol% or more, more preferably 30 mol% or more, still more preferably. It is 31.5 mol% or more, more preferably 32 mol% or more, and particularly preferably 33 mol% or more. The content of each of the hydroxyl groups of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 38 mol% or less, more preferably 37 mol% or less, still more preferably 36.5 mol% or less, and particularly preferably. Is 36 mol% or less. When the content of the hydroxyl group is at least the above lower limit, the adhesive strength of the interlayer film becomes even higher. Further, when the content of the hydroxyl group is not more than the above upper limit, the flexibility of the interlayer film is increased and the handling of the interlayer film becomes easy.

From the viewpoint of further enhancing the sound insulation property, it is preferable that the hydroxyl group content of the polyvinyl acetal resin (1) is lower than the hydroxyl group content of the polyvinyl acetal resin (2). From the viewpoint of further enhancing the sound insulation property, it is preferable that the hydroxyl group content of the polyvinyl acetal resin (1) is lower than the hydroxyl group content of the polyvinyl acetal resin (3). From the viewpoint of further enhancing the sound insulation property, the absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (2) is preferably 1 mol% or more. , More preferably 5 mol% or more, still more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. From the viewpoint of further enhancing the sound insulation property, the absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (3) is preferably 1 mol% or more. , More preferably 5 mol% or more, still more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. The absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (2), the hydroxyl group content of the polyvinyl acetal resin (1), and the above. The absolute value of the difference from the hydroxyl group content of the polyvinyl acetal resin (3) is preferably 20 mol% or less.

The hydroxyl group content of the polyvinyl acetal resin is a value indicating the mole fraction obtained by dividing the amount of ethylene groups to which the hydroxyl groups are bonded by the total amount of ethylene groups in the main chain. The amount of ethylene groups to which the hydroxyl groups are bonded can be measured, for example, in accordance with JIS K6728 “Polyvinyl butyral test method”.

The degree of acetylation (acetyl group amount) of the polyvinyl acetal resin (0) is preferably 0.1 mol% or more, more preferably 0.3 mol% or more, still more preferably 0.5 mol% or more, preferably 30. It is mol% or less, more preferably 25 mol% or less, still more preferably 20 mol% or less. When the degree of acetylation is at least the above lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer becomes high. When the degree of acetylation is not more than the above upper limit, the moisture resistance of the interlayer film and the laminated glass becomes high.

The degree of acetylation (acetyl group amount) of the polyvinyl acetal resin (1) is preferably 0.01 mol% or more, more preferably 0.1 mol% or more, still more preferably 7 mol% or more, still more preferably 9. It is mol% or more, preferably 30 mol% or less, more preferably 25 mol% or less, still more preferably 24 mol% or less, and particularly preferably 20 mol% or less. When the degree of acetylation is at least the above lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer becomes high. When the degree of acetylation is not more than the above upper limit, the moisture resistance of the interlayer film and the laminated glass becomes high. In particular, when the degree of acetylation of the polyvinyl acetal resin (1) is 0.1 mol% or more and 25 mol% or less, the penetration resistance is excellent.

The degree of acetylation of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 0.01 mol% or more, more preferably 0.5 mol% or more, preferably 10 mol% or less, more preferably. Is less than 2 mol%. When the degree of acetylation is at least the above lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer becomes high. When the degree of acetylation is not more than the above upper limit, the moisture resistance of the interlayer film and the laminated glass becomes high.

The degree of acetylation is a value indicating the mole fraction obtained by dividing the amount of ethylene groups to which acetyl groups are bonded by the total amount of ethylene groups in the main chain. The amount of ethylene group to which the acetyl group is bonded can be measured, for example, in accordance with JIS K6728 “Polyvinyl butyral test method”.

The degree of acetalization (in the case of polyvinyl butyral resin, the degree of butyralization) of the polyvinyl acetal resin (0) is preferably 60 mol% or more, more preferably 63 mol% or more, preferably 85 mol% or less, more preferably. It is 75 mol% or less, more preferably 70 mol% or less. When the degree of acetalization is at least the above lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer becomes high. When the degree of acetalization is not more than the above upper limit, the reaction time required for producing the polyvinyl acetal resin is shortened.

The degree of acetalization (in the case of polyvinyl butyral resin, the degree of butyralization) of the polyvinyl acetal resin (1) is preferably 47 mol% or more, more preferably 60 mol% or more, preferably 85 mol% or less, more preferably. It is 80 mol% or less, more preferably 75 mol% or less. When the degree of acetalization is at least the above lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer becomes high. When the degree of acetalization is not more than the above upper limit, the reaction time required for producing the polyvinyl acetal resin is shortened.

The degree of acetalization (in the case of polyvinyl butyral resin, the degree of butyralization) of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 55 mol% or more, more preferably 60 mol% or more, preferably 60 mol% or more. Is 75 mol% or less, more preferably 71 mol% or less. When the degree of acetalization is at least the above lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer becomes high. When the degree of acetalization is not more than the above upper limit, the reaction time required for producing the polyvinyl acetal resin is shortened.

The degree of acetalization is the total ethylene group amount of the main chain obtained by subtracting the ethylene group amount to which the hydroxyl group is bonded and the ethylene group amount to which the acetyl group is bonded from the total ethylene group amount of the main chain. It is a value showing the molar fraction obtained by dividing by the percentage.

The hydroxyl group content (hydroxyl group amount), acetalization degree (butyralization degree), and acetylation degree are preferably calculated from the results measured by a method based on JIS K 6728 "polyvinyl butyral test method". However, measurement by ASTM D1396-92 may be used. When the polyvinyl acetal resin is a polyvinyl butyral resin, the hydroxyl group content (hydroxyl group amount), the acetalization degree (butyralization degree), and the acetylation degree are based on JIS K6728 "polyvinyl butyral test method". Can be calculated from the results measured by.

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

The plasticizer is not particularly limited. Conventionally known plasticizers can be used as the plasticizers. Only one kind of the above-mentioned plasticizer may be used, or two or more kinds may be used in combination.

Examples of the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, and organic phosphoric acid plasticizers such as organic phosphoric acid plasticizers and organic subphosphoric acid plasticizers. .. Organic ester plasticizers are preferred. The plasticizer is preferably a liquid plasticizer.

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, tripropylene glycol and the like. Examples of the monobasic organic acid include buty acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptyl acid, n-octyl acid, 2-ethylhexic acid, n-nonyl acid and decyl acid.

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

Examples of the organic ester plasticizer include triethylene glycol di-2-ethylpropanoate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, and triethylene glycol dicaprylate. Triethylene Glycol Di-n-Octanoate, Triethylene Glycol Di-n-Heptanoate, Tetraethylene Glycol Di-n-Heptanoate, Dibutyl Sevakate, Dioctyl Azelate, Dibutyl Carbitol Adipate, Ethylene Glycol Di-2-Ethyl Butyrate, 1,3-propylene glycol di-2-ethylbutyrate, 1,4-butylene glycol di-2-ethylbutyrate, diethylene glycol di-2-ethylbutyrate, diethylene glycol di-2-ethylhexanoate, dipropylene glycol Di-2-ethylbutyrate, triethylene glycol di-2-ethylpentanoate, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol dicaprylate, dihexyl adipate, dioctyl adipate, hexylcyclohexyl adipate, adipine Examples thereof include a mixture of heptyl acid and nonyl adipate, diisononyl adipate, diisodecyl adipate, heptyl nonyl adipate, dibutyl sebacate, oil-modified sebacic acid alkyd, and a mixture of phosphoric acid ester and adipic acid ester. Organic ester plasticizers other than these may be used. Other adipate esters other than the above-mentioned adipate ester may be used.

Examples of the organophosphate plasticizer include tributoxyethyl phosphate, isodecylphenyl phosphate, triisopropyl phosphate and the like.

The plasticizer is preferably a diester plasticizer represented by the following formula (1).

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. .. It is preferable that R1 and R2 in the above formula (1) are organic groups having 6 to 10 carbon atoms, respectively.

The plasticizer preferably contains triethylene glycol di-2-ethylhexanoate (3GO) or triethylene glycol di-2-ethylbutyrate (3GH), and the triethylene glycol di-2-ethylhexanoate. It is more preferable to include.

In the interlayer film, the content of the plasticizer (0) with respect to 100 parts by weight of the thermoplastic resin (0) is defined as the content (0). The content (0) is preferably 25 parts by weight or more, more preferably 30 parts by weight or more, preferably 100 parts by weight or less, more preferably 60 parts by weight or less, still more preferably 50 parts by weight or less. When the content (0) is at least the above lower limit, the penetration resistance of the laminated glass is further increased. When the content (0) is not more than the upper limit, the transparency of the interlayer film becomes even higher.

In the first layer, the content of the plasticizer (1) with respect to 100 parts by weight of the thermoplastic resin (1) is defined as the content (1). The content (1) is preferably 50 parts by weight or more, more preferably 55 parts by weight or more, further preferably 60 parts by weight or more, preferably 100 parts by weight or less, more preferably 90 parts by weight or less, still more preferably 85 parts by weight. By weight or less, particularly preferably 80 parts by weight or less. When the content (1) is at least the above lower limit, the flexibility of the interlayer film becomes high and the handling of the interlayer film becomes easy. When the content (1) is not more than the upper limit, the penetration resistance of the laminated glass is further increased.

In the second layer, the content of the plasticizer (2) with respect to 100 parts by weight of the thermoplastic resin (2) is defined as the content (2). In the third layer, the content of the plasticizer (3) with respect to 100 parts by weight of the thermoplastic resin (3) is defined as the content (3). The content (2) and the content (3) are preferably 10 parts by weight or more, more preferably 15 parts by weight or more, still more preferably 20 parts by weight or more, and particularly preferably 24 parts by weight or more, preferably 40 parts by weight or more. By weight or less, more preferably 35 parts by weight or less, still more preferably 32 parts by weight or less, and particularly preferably 30 parts by weight or less. When the content (2) and the content (3) are at least the above lower limit, the flexibility of the interlayer film becomes high and the handling of the interlayer film becomes easy. When the content (2) and the content (3) are not more than the upper limit, the penetration resistance of the laminated glass is further increased.

In order to enhance the sound insulation of the laminated glass, the content (1) is preferably higher than the content (2), and the content (1) is preferably higher than the content (3).

From the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the above-mentioned content (2) and the above-mentioned content (1), and the difference between the above-mentioned content (3) and the above-mentioned content (1). The absolute value of each is preferably 10 parts by weight or more, more preferably 15 parts by weight or more, still more preferably 20 parts by weight or more. The absolute value of the difference between the content (2) and the content (1) and the absolute value of the difference between the content (3) and the content (1) are preferably 80 parts by weight or less, respectively. It is more preferably 75 parts by weight or less, still more preferably 70 parts by weight or less.

Heat shield:
The interlayer film preferably contains a heat-shielding substance. The first layer preferably contains a heat-shielding substance. The second layer preferably contains a heat-shielding substance. The third layer preferably contains a heat-shielding substance. Only one kind of the heat-shielding substance may be used, or two or more kinds thereof may be used in combination.

The heat-shielding substance preferably contains at least one component X of the phthalocyanine compound, the naphthalocyanine compound and the anthracyanine compound, or preferably contains heat-shielding particles. In this case, both the component X and the heat-shielding particles may be contained.

The interlayer film preferably contains at least one component X of the phthalocyanine compound, the naphthalocyanine compound and the anthracyanine compound. The first layer preferably contains the component X. The second layer preferably contains the component X. The third layer preferably contains the component X. The component X is a heat-shielding substance. As the component X, only one kind may be used, or two or more kinds may be used in combination.

The above component X is not particularly limited. As the component X, conventionally known phthalocyanine compounds, naphthalocyanine compounds and anthracyanine compounds can be used.

Examples of the component X include phthalocyanine, phthalocyanine derivatives, naphthalocyanine, naphthalocyanine derivatives, anthracyanine and anthracyanine derivatives, and the like. It is preferable that the phthalocyanine compound and the phthalocyanine derivative each have a phthalocyanine skeleton. It is preferable that the naphthalocyanine compound and the derivative of the naphthalocyanine each have a naphthalocyanine skeleton. It is preferable that the anthracyanine compound and the derivative of the anthracyanine each have an anthracyanine skeleton.

From the viewpoint of further enhancing the heat-shielding property of the interlayer film and laminated glass, the component X is preferably at least one selected from the group consisting of phthalocyanine, phthalocyanine derivative, naphthalocyanine and naphthalocyanine derivative. , Phthalocyanine and at least one of the derivatives of phthalocyanine are more preferable.

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

The content of the component X is preferably 0.001% by weight in 100% by weight of the interlayer film or 100% by weight of the layer (first layer, second layer or third layer) containing the component X. As mentioned above, it is more preferably 0.005% by weight or more, further preferably 0.01% by weight or more, and particularly preferably 0.02% by weight or more. The content of the component X is preferably 0.2% by weight in 100% by weight of the interlayer film or 100% by weight of the layer (first layer, second layer or third layer) containing the component X. Below, it is more preferably 0.1% by weight or less, further preferably 0.05% by weight or less, and particularly preferably 0.04% by weight or less. When the content of the component X is not less than the above lower limit and not more than the above upper limit, the heat shielding property is sufficiently high and the visible light transmittance is sufficiently high. For example, the visible light transmittance can be 70% or more.

The interlayer film preferably contains heat-shielding particles. The first layer preferably contains the heat-shielding particles. The second layer preferably contains the heat shield particles. The third layer preferably contains the heat-shielding particles. The heat-shielding particles are heat-shielding substances. Infrared rays (heat rays) can be effectively blocked by using heat-shielding particles. Only one kind of the heat shield particles may be used, or two or more kinds may be used in combination.

From the viewpoint of further enhancing the heat-shielding property of the laminated glass, the heat-shielding particles are more preferably metal oxide particles. The heat-shielding particles are preferably particles formed of metal oxides (metal oxide particles).

Infrared rays with a wavelength of 780 nm or more, which is longer than visible light, have a smaller amount of energy than ultraviolet rays. However, infrared rays have a large thermal effect, and when infrared rays are absorbed by a substance, they are emitted as heat. For this reason, infrared rays are generally called heat rays. By using the heat shield particles, infrared rays (heat rays) can be effectively blocked. The heat-shielding particles mean particles that can absorb infrared rays.

Specific examples of the heat shield particles include aluminum-doped tin oxide particles, indium-doped tin oxide particles, antimony-doped tin oxide particles (ATO particles), gallium-doped zinc oxide particles (GZO particles), and indium-doped zinc oxide particles (IZO particles). ), Aluminum-doped zinc oxide particles (AZO particles), niob-doped titanium oxide particles, sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, tallium-doped tungsten oxide particles, rubidium-doped tungsten oxide particles, tin-doped indium oxide particles (ITO particles). , Tin-doped zinc oxide particles, silicon-doped zinc oxide particles and other metal oxide particles, hexaborocarbonated lanthanum (LaB ₆ ) particles and the like. Heat-shielding particles other than these may be used. Metal oxide particles are preferable, ATO particles, GZO particles, IZO particles, ITO particles or tungsten oxide particles are more preferable, and ATO particles, ITO particles or tungsten oxide particles are more preferable, and ITO particles or Tungsten oxide particles are particularly preferred. In particular, tin-doped indium oxide particles (ITO particles) are preferable, and tungsten oxide particles are also preferable, because they have a high heat ray shielding function and are easily available.

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

Cesium-doped tungsten oxide particles are particularly preferable from the viewpoint of further increasing the heat-shielding property of the interlayer film and the laminated glass. From the viewpoint of further improving the heat-shielding property of the interlayer film and the laminated glass, the cesium-doped tungsten oxide particles are preferably tungsten oxide particles represented by the formula: Cs _0.33 WO ₃ .

The average particle size of the heat-shielding particles is preferably 0.01 μm or more, more preferably 0.02 μm or more, preferably 0.1 μm or less, and more preferably 0.05 μm or less. When the average particle size is equal to or greater than the above lower limit, the heat ray shielding property becomes sufficiently high. When the average particle size is not more than the above upper limit, the dispersibility of the heat shield particles becomes high.

The above "average particle size" indicates a volume average particle size. The average particle size can be measured using a particle size distribution measuring device (“UPA-EX150” manufactured by Nikkiso Co., Ltd.) or the like.

The content of the heat-shielding particles is preferably 0.01 in 100% by weight of the interlayer film or 100% by weight of the layer containing the heat-shielding particles (first layer, second layer or third layer). By weight% or more, more preferably 0.1% by weight or more, still more preferably 1% by weight or more, and particularly preferably 1.5% by weight or more. The content of the heat-shielding particles is preferably 6% by weight in 100% by weight of the interlayer film or 100% by weight of the layer containing the heat-shielding particles (first layer, second layer or third layer). Below, it is more preferably 5.5% by weight or less, further preferably 4% by weight or less, particularly preferably 3.5% by weight or less, and most preferably 3% by weight or less. When the content of the heat-shielding particles is not less than the above lower limit and not more than the above upper limit, the heat-shielding property is sufficiently high and the visible light transmittance is sufficiently high.

Metal salt:
The interlayer film preferably contains at least one metal salt (hereinafter, may be referred to as metal salt M) among an alkali metal salt, an alkaline earth metal salt and a magnesium salt. The first layer preferably contains the metal salt M. The second layer preferably contains the metal salt M. The third layer preferably contains the metal salt M. By using the metal salt M, it becomes easy to control the adhesiveness between the interlayer film and the laminated glass member such as a glass plate or the adhesiveness between each layer in the interlayer film. As the metal salt M, only one kind may be used, or two or more kinds may be used in combination.

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

The metal salt M is an alkali metal salt of an organic acid having 2 to 16 carbon atoms, an alkaline earth metal salt of an organic acid having 2 to 16 carbon atoms, or a magnesium salt of an organic acid having 2 to 16 carbon atoms. Is more preferable, and a magnesium carboxylate salt having 2 to 16 carbon atoms or a potassium carboxylate salt having 2 to 16 carbon atoms is even more preferable.

Examples of the magnesium carboxylic acid salt having 2 to 16 carbon atoms and the potassium carboxylic acid salt having 2 to 16 carbon atoms include magnesium acetate, potassium acetate, magnesium propionate, potassium propionate, magnesium 2-ethylbutyrate, and 2-ethylbutanoic acid. Examples thereof include potassium, magnesium 2-ethylhexanoate and potassium 2-ethylhexanoate.

The total content of Mg and K in the interlayer film containing the metal salt M or the layer containing the metal salt M (first layer, second layer or third layer) is preferably 5 ppm or more. It is preferably 10 ppm or more, more preferably 20 ppm or more, preferably 300 ppm or less, more preferably 250 ppm or less, still more preferably 200 ppm or less. When the total content of Mg and K is not less than the above lower limit and not more than the above upper limit, the adhesiveness between the interlayer film and the glass plate or the adhesiveness between each layer of the interlayer film can be controlled more satisfactorily.

UV shielding agent:
The interlayer film preferably contains an ultraviolet shielding agent. The first layer preferably contains an ultraviolet shielding agent. The second layer preferably contains an ultraviolet shielding agent. The third layer preferably contains an ultraviolet shielding agent. Due to the use of the ultraviolet shielding agent, the visible light transmittance is less likely to decrease even if the interlayer film and the laminated glass are used for a long period of time. Only one kind of the above-mentioned ultraviolet shielding agent may be used, or two or more kinds thereof may be used in combination.

The ultraviolet shielding agent includes an ultraviolet absorbing agent. The ultraviolet shielding agent is preferably an ultraviolet absorber.

Examples of the ultraviolet shielding agent include an ultraviolet shielding agent containing a metal atom, an ultraviolet shielding agent containing a metal oxide, an ultraviolet shielding agent having a benzotriazole structure (benzotriazole compound), and an ultraviolet shielding agent having a benzophenone structure (benzophenone compound). ), An ultraviolet shielding agent having a triazine structure (triazine compound), an ultraviolet shielding agent having a malonic acid ester structure (malonic acid ester compound), an ultraviolet shielding agent having a oxalic acid anilide structure (a oxalic acid anilide compound), and a benzoate structure. Examples thereof include an ultraviolet shielding agent (benzoate compound).

Examples of the ultraviolet shielding agent containing a metal atom include platinum particles, particles in which the surface of platinum particles is coated with silica, palladium particles, particles in which the surface of palladium particles is coated with silica, and the like. The UV shielding agent is preferably not heat-shielding particles.

The ultraviolet shielding agent is preferably an ultraviolet shielding agent having a benzotriazole structure, an ultraviolet shielding agent having a benzophenone structure, an ultraviolet shielding agent having a triazine structure, or an ultraviolet shielding agent having a benzoate structure. The ultraviolet shielding agent is more preferably an ultraviolet shielding agent having a benzotriazole structure or an ultraviolet shielding agent having a benzophenone structure, and further preferably an ultraviolet shielding agent having a benzotriazole structure.

Examples of the ultraviolet shielding agent containing the metal oxide include zinc oxide, titanium oxide, cerium oxide and the like. Further, the surface of the ultraviolet shielding agent containing the metal oxide may be coated. Examples of the coating material on the surface of the ultraviolet shielding agent containing the metal oxide include insulating metal oxides, hydrolyzable organosilicon compounds, silicone compounds and the like.

Examples of the insulating metal oxide include silica, alumina and zirconia. The insulating metal oxide has a bandgap energy of, for example, 5.0 eV or more.

Examples of the ultraviolet shielding agent having a benzotriazole structure include 2- (2'-hydroxy-5'-methylphenyl) benzotriazole ("TinuvinP" manufactured by BASF), 2- (2'-hydroxy-3', 5'-di-t-butylphenyl) benzotriazole (BASF "Tinuvin320"), 2- (2'-hydroxy-3'-t-butyl-5-methylphenyl) -5-chlorobenzotriazole (BASF) "Tinuvin 326" manufactured by BASF), 2- (2'-hydroxy-3', 5'-di-amylphenyl) benzotriazole ("Tinuvin 328" manufactured by BASF) and the like. Since the ultraviolet shielding agent is excellent in the ability to shield ultraviolet rays, the ultraviolet shielding agent is preferably an ultraviolet shielding agent having a benzotriazole structure containing a halogen atom, and may be an ultraviolet shielding agent having a benzotriazole structure containing a chlorine atom. More preferred.

Examples of the ultraviolet shielding agent having a benzophenone structure include octabenzone (“Chimassorb81” manufactured by BASF) and the like.

Examples of the ultraviolet shielding agent having the above triazine structure include "LA-F70" manufactured by ADEKA and 2- (4,6-diphenyl-1,3,5-triazine-2-yl) -5-[(hexyl). Oxy] -phenol (“Tinuvin1577FF” manufactured by BASF) and the like can be mentioned.

Examples of the ultraviolet shielding agent having a malonic acid ester structure include 2- (p-methoxybenzylidene) dimethyl malonate, tetraethyl-2,2- (1,4-phenylenedimethylidene) bismaronate, and 2- (p-methoxybenzylidene). -Bis (1,2,2,6,6-pentamethyl4-piperidinyl) malonate and the like can be mentioned.

Examples of commercially available products of the ultraviolet shielding agent having a malonic acid ester structure include Hostavin B-CAP, Hostavin PR-25, and Hostavin PR-31 (all manufactured by Clariant).

Examples of the ultraviolet shielding agent having the oxalic acid anilides structure include N- (2-ethylphenyl) -N'-(2-ethoxy-5-t-butylphenyl) oxalic acid diamide and N- (2-ethylphenyl)-. A oxalic acid diamide having an aryl group substituted on a nitrogen atom such as N'-(2-ethoxy-phenyl) oxalic acid diamide and 2-ethyl-2'-ethoxy-oxyanilide ("SanduvorVSU" manufactured by Clariant). Kind is mentioned.

Examples of the ultraviolet shielding agent having the benzoate structure include 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate (“Tinuvin 120” manufactured by BASF) and the like. ..

The content of the ultraviolet shielding agent is preferably 0.1 in 100% by weight of the interlayer film or 100% by weight of the layer (first layer, second layer or third layer) containing the ultraviolet shielding agent. By weight% or more, more preferably 0.2% by weight or more, still more preferably 0.3% by weight or more, and particularly preferably 0.5% by weight or more. The content of the UV shielding agent is preferably 2.5 in 100% by weight of the interlayer film or 100% by weight of the layer containing the UV shielding agent (first layer, second layer or third layer). It is 0% by weight or less, more preferably 2% by weight or less, still more preferably 1% by weight or less, and particularly preferably 0.8% by weight or less. When the content of the ultraviolet shielding agent is not less than the above lower limit and not more than the above upper limit, the decrease in the visible light transmittance after the elapse of the period can be further suppressed. In particular, when the content of the ultraviolet shielding agent is 0.2% by weight or more in 100% by weight of the layer containing the ultraviolet shielding agent, the visible light transmittance of the interlayer film and the laminated glass after a period of time is lowered. It can be significantly suppressed.

Antioxidant:
The interlayer film preferably contains an antioxidant. The first layer preferably contains an antioxidant. The second layer preferably contains an antioxidant. The third layer preferably contains an antioxidant. Only one kind of the above-mentioned antioxidant may be used, or two or more kinds may be used in combination.

Examples of the antioxidant include phenolic antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants and the like. The above-mentioned phenolic antioxidant is an antioxidant having a phenol skeleton. The sulfur-based antioxidant is an antioxidant containing a sulfur atom. The phosphorus-based antioxidant is an antioxidant containing a phosphorus atom.

The above-mentioned antioxidant is preferably a phenol-based antioxidant or a phosphorus-based antioxidant.

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

Examples of the phosphorus-based antioxidant include tridecylphosphite, tris (tridecyl) phosphite, triphenylphosphite, trinonylphenylphosphite, bis (tridecyl) pentaerythritol diphosphite, and bis (decyl) pentaerythritol diphos. Fight, Tris (2,4-di-t-butylphenyl) phosphite, bis (2,4-di-t-butyl-6-methylphenyl) ethyl ester phosphite, and 2,2'-methylenebis (4) , 6-di-t-butyl-1-phenyloxy) (2-ethylhexyloxy) phosphorus and the like. One or more of these antioxidants are preferably used.

Examples of commercially available products of the above-mentioned antioxidants include "IRGANOX 245" manufactured by BASF, "IRGAFOS 168" manufactured by BASF, "IRGAFOS 38" manufactured by BASF, "Smilizer BHT" manufactured by Sumitomo Chemical Co., Ltd., and "Smilizer BHT" manufactured by Sakai Chemical Industry Co., Ltd. Examples thereof include "H-BHT" and "IRGANOX 1010" manufactured by BASF.

In order to maintain the high visible light transmittance of the interlayer film and laminated glass for a long period of time, a layer (first layer, second layer or third layer) containing 100% by weight of the interlayer film or an antioxidant. ) The content of the antioxidant is preferably 0.1% by weight or more in 100% by weight. Further, since the effect of adding the antioxidant is saturated, the content of the antioxidant is preferably 2% by weight or less in 100% by weight of the interlayer film or 100% by weight of the layer containing the antioxidant. ..

Other ingredients:
The interlayer film, the first layer, the second layer, and the third layer are each, if necessary, a coupling agent, a dispersant, a surfactant, a flame retardant, an antistatic agent, a pigment, and a dye. , Additives such as adhesive strength modifiers, moisture resistant agents, fluorescent whitening agents and infrared absorbers other than metal salts may be contained. Only one of these additives may be used, or two or more of these additives may be used in combination.

(How to attach laminated glass)
The method for attaching a laminated glass according to the present invention is a method for attaching the above-mentioned laminated glass to an opening between an external space and an internal space in which heat rays are incident from the external space in a building or a vehicle.

Specifically, one of the first laminated glass member and the second laminated glass member is located on the internal space side, and among the first laminated glass member and the second laminated glass member. The laminated glass is attached to the opening so that the other is located on the external space side. That is, they are arranged in the order of internal space / first laminated glass member (or second laminated glass member) / interlayer film / second laminated glass member (or first laminated glass member) / external space. Install laminated glass. The above-mentioned arrangement form includes a case where another member is arranged between the internal space and the first laminated glass member or the second laminated glass member, and the external space and the first laminated glass member or The case where another member is arranged between the second laminated glass member and the member is included.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. The present invention is not limited to these examples.

In the polyvinyl acetal resin used, n-butyraldehyde having 4 carbon atoms is used for acetalization. For the polyvinyl acetal resin, the degree of acetalization (degree of butyralization), the degree of acetylation and the content of hydroxyl groups were measured by a method based on JIS K 6728 “Polyvinyl butyral test method”. In addition, when measured by ASTM D1396-92, the same numerical value as the method based on JIS K6728 "polyvinyl butyral test method" was shown.

(Examples 1 to 5 and Comparative Examples 1 to 4)
(Method for producing interlayer film)
Preparation of composition for forming the first layer:
The following components were thoroughly kneaded with a mixing roll to obtain a composition for forming the first layer.

Polyvinyl acetal resin (average polymerization degree 3000, hydroxyl group content 24 mol%, acetylation degree 12 mol%, acetalization degree 64 mol%) 100 parts by weight Triethylene glycol di-2-ethylhexanoate (3GO) 60 weight by weight Part Tinuvin 326 (2- (2'-hydroxy-3'-t-butyl-5-methylphenyl) -5-chlorobenzotriazole, "Tinuvin 326" manufactured by BASF) in an interlayer film obtained at 0.2% by weight. BHT (2,6-di-t-butyl-p-cresol) 0.2 parts by weight Amount to be 0.2% by weight in the obtained interlayer film

Preparation of composition for forming the second layer and the third layer:
The following components were sufficiently kneaded with a mixing roll to obtain a composition for forming a second layer and a third layer.

Polypolyacetal resin (average polymerization degree 1700, hydroxyl group content 30.6 mol%, acetylation degree 0.9 mol%, acetalization degree 68.5 mol%) 100 parts by weight Triethylene glycol di-2-ethylhexano In an interlayer film obtained as ate (3GO) 38 parts by weight Tinuvin326 (2- (2'-hydroxy-3'-t-butyl-5-methylphenyl) -5-chlorobenzotriazole, BASF "Tinuvin326"). Amount to be 0.2% by weight Amount to be 0.2% by weight in the interlayer film from which BHT (2,6-di-t-butyl-p-cresol) can be obtained.

Preparation of interlayer film:
The composition for forming the first layer and the composition for forming the second layer and the third layer were coextruded using a coextruder.

In this way, a rectangular interlayer film having a laminated structure of a second layer / a first layer / a third layer was produced. The thickness ratio of the second layer / first layer / third layer was 3.5: 1: 3.5.

(Method of making laminated glass)
The laminated glass produced as follows was evaluated as described later.

Prepare clear glass having the shape, thickness and wedge angle shown in Table 1 below.

An interlayer film having a size corresponding to the size of the glass plates was sandwiched between the pair of glass plates to obtain a laminated body. The obtained laminate was fitted into an EPDM rubber tube (frame member). The width of the rubber tube is 15 mm. Next, the laminate fitted in the EPDM rubber tube was pre-crimped by the vacuum bag method. Laminated glass is obtained by crimping the pre-crimped laminate at a pressure of 150 ° C. and 1.2 MPa using an autoclave.

(Examples 6 to 10 and Comparative Examples 5 to 8)
(Method for producing interlayer film)
Preparation of composition for forming an interlayer (first layer):
The following components were sufficiently kneaded with a mixing roll to obtain a composition for forming an interlayer film.

Polypolyacetal resin (average polymerization degree 1700, hydroxyl group content 30.6 mol%, acetylation degree 0.9 mol%, acetalization degree 68.5 mol%) 100 parts by weight Triethylene glycol di-2-ethylhexano 40 parts by weight of ate (3GO) Tinuvin326 (2- (2'-hydroxy-3'-t-butyl-5-methylphenyl) -5-chlorobenzotriazole, BASF "Tinuvin326") can be obtained in an interlayer film. Amount to be 0.2% by weight BHT (2,6-di-t-butyl-p-cresol) 0.2 part by weight in an interlayer film obtained.

Preparation of interlayer film:
The composition for forming the interlayer film was extruded using an extruder.

In this way, a rectangular interlayer film having a one-layer structure was produced.

(Method of making laminated glass)
The laminated glass produced was evaluated as described below.

Prepare clear glass having the shape, thickness and wedge angle shown in Table 2 below.

An interlayer film having a size corresponding to the size of the glass plates was sandwiched between the pair of glass plates to obtain a laminated body. The obtained laminate was fitted into an EPDM rubber tube (frame member). The width of the rubber tube is 15 mm. Next, the laminate fitted in the EPDM rubber tube was pre-crimped by the vacuum bag method. Laminated glass is obtained by crimping the pre-crimped laminate at a pressure of 150 ° C. and 1.2 MPa using an autoclave.

(evaluation)
The obtained laminated glass was installed at the position of the windshield. The display information was reflected on the laminated glass from the display unit installed below the laminated glass, and the presence or absence of multiple images was visually confirmed at a predetermined position (center of the display area). The multiple image was judged according to the following criteria. For the multilayer image, a laminated glass (length 700 mm, width 500 mm) corresponding to a laminated glass partial region having a length of 700 mm and a width of 500 mm including the center of the display area of the laminated glass of Examples and Comparative Examples was prepared, and the laminated glass was prepared. Was installed in the display area of the windshield and evaluated.

[Criteria for judging multiple images]
○: Multiple images are not confirmed ×: Multiple images are confirmed

Details and results are shown in Tables 1 and 2 below. In the obtained laminated glass, the first laminated glass member, the interlayer film, and the second laminated glass member had the shapes, thicknesses, and wedge angles in Tables 1 and 2.

As a result of evaluating the sound insulation of the laminated glass using the interlayer films obtained in Examples 1 to 5 by the acoustic transmission loss, it was confirmed that the laminated glass was excellent in sound insulation.

1,1A, 1B, 1C, 1D, 1E, 1F, 1G ... Intermediate film 2,2A, 2B, 2C, 2D, 2E, 2F, 2G ... First laminated glass member 3,3A, 3B, 3C, 3D, 3E, 3F, 3G ... Second laminated glass member 11, 11A, 11B, 11C, 11D, 11E, 11F, 11G ... Laminated glass 11a ... One end 11b ... Other end 21,21A, 21B, 21C ... First layer 22 , 22A, 22B, 22C ... Second layer 23,23A, 23B, 23C ... Third layer

Claims (10)

It is a laminated glass that is a head-up display,
Has a display area of a heads-up display
It has one end and the other end on the opposite side of the one end, which is thicker than the one end.
A first laminated glass member, a second laminated glass member, and an interlayer film arranged between the first laminated glass member and the second laminated glass member are provided.
The first laminated glass member has a wedge angle of 0.20 mrad or more, and has a wedge angle of 0.20 mrad or more.
In the center of the display area, the thickness of the first laminated glass member is 2.03 mm or more.
A laminated glass having a ratio of the thickness of the first laminated glass member to the thickness of the interlayer film of 2.30 or more and 3.0 or less in the center of the display area. The laminated glass according to claim 1, wherein the wedge angle of the first laminated glass member is larger than the wedge angle of the interlayer film. The laminated glass according to claim 2, wherein the wedge angle of the first laminated glass member is 0.10 mrad or more larger than the wedge angle of the interlayer film. The laminated glass according to any one of claims 1 to 3, wherein the interlayer film has a wedge angle of less than 0.10 mrad. The laminated glass according to any one of claims 1 to 4, which has a wedge angle of 0.10 mrad or more. The laminated glass according to any one of claims 1 to 5, wherein the second laminated glass member has a wedge angle of 0.10 mrad or more. The laminated glass according to any one of claims 1 to 6, wherein the interlayer film contains a thermoplastic resin. The laminated glass according to any one of claims 1 to 7, wherein the interlayer film contains a plasticizer. The laminated glass according to any one of claims 1 to 8, wherein the interlayer film comprises a first layer and a second layer arranged on the first surface side of the first layer. The laminated glass according to claim 9, wherein the interlayer film comprises a third layer arranged on a second surface side opposite to the first surface of the first layer.

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