Vehicle side glass

Abstract

To provide a side glass for a vehicle which suppresses fogging of a front part of the side glass, and can suppress lowering of visibility of a side mirror.SOLUTION: A side glass for a vehicle has a glass plate (10), and an antifogging film (50) which exists on a surface (SI) on the vehicular inside of the glass plate and contains a water-absorbing resin or a hydrophilic resin, has an antifogging layer-unformed region (71) of the antifogging film on a side (11) of the front side of the glass plate and the side end on the front side including its vicinity part, has an antifogging film-unformed region (72 and / or 73) on at least one end of a side end on the rear side including a side (12) on the rear side of the glass plate and its vicinity part, and an upper end including an upper side 13 of the glass plate and its vicinity part, and expression: Sb+Su>Sf is satisfied. Sf is an area of the antifogging film-unformed region (71) on the front side, Sb is an area of the antifogging film-unformed region (72) on the rear side, and Su is an area of the antifogging film-unformed region (73) on the upper side.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a side glass for a vehicle. [Background technology]

[0002] In windowpanes for vehicles such as automobiles, an anti-fogging film is sometimes provided on the interior surface of the glass plate to prevent fogging. As an anti-fogging film, a film containing a water-absorbent resin is known (see the section "Background Art" in Patent Document 1).

[0003] Methods for providing an anti-fogging film on a glass plate include a method of adhering an anti-fogging film with an adhesive layer, which has a laminated structure of anti-fogging film / substrate film / adhesive layer, to the surface of the glass plate; a method of adhering a release film, which has a laminated structure of release film / anti-fogging film / adhesive layer, and an anti-fogging film with an adhesive layer to the surface of the glass plate, and then peeling off the release film; and a method of forming an anti-fogging coating film as an anti-fogging film on the surface of the glass plate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2016-108523 Summary of the Invention [Problem to be solved by the invention]

[0005] The anti-fogging film loses its anti-fogging effect when the amount of water absorption reaches a saturated amount. The inventors conducted actual vehicle driving tests on a vehicle with an anti-fogging film applied to the side glass and found that, depending on the environment outside and inside the vehicle, the side glass may fog up even if it has an anti-fogging film. In vehicles such as automobiles, if the front side edge (also simply referred to as the front portion) of the driver's or passenger's side window, including its front side edge and its surrounding area, becomes foggy, visibility in the side mirror is reduced, which reduces driving safety, and is therefore undesirable.

[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a vehicle side glass that can suppress fogging in the front portion of the side glass, suppress a decrease in visibility in the side mirror, and improve driving safety. [Means for solving the problem]

[0007] The present invention provides the following vehicle side glass. [1] A vehicle side glass having a glass plate and an anti-fogging film containing a water-absorbent resin or a hydrophilic resin present on the interior surface of the glass plate, In plan view, When the forward direction of the vehicle is defined as the forward direction and the backward direction of the vehicle is defined as the rearward direction, the glass plate has a front side edge and a rear side edge and a top edge when fitted into the vehicle, and the anti-fogging film has a front side edge and a rear side edge and a top edge, a region where the anti-fogging film is absent is provided on a front side edge portion of the glass plate, the front side edge including the front side edge and a portion in the vicinity thereof; a region where the anti-fogging film is absent is present on at least one of a rear side edge portion of the glass plate, which includes the rear side edge and a portion thereof in the vicinity thereof, and an upper edge portion of the glass plate, which includes the upper edge and a portion thereof in the vicinity thereof; A side glass for a vehicle that satisfies the following formula (1):

[0008] Sb + Su > Sf (1) In the above formula, Sf is the area [mm 2 ], and Sb is the area [mm 2 ], and Su is the area [mm 2 ]. Measurement points were set at 1 mm intervals on the front side edge of the anti-fogging film from one end point to the other end point, and the shortest line segment was drawn at each measurement point to the front side edge of the glass plate. The total length [mm] of all the line segments was calculated as Sf [mm 2 ]. When the rear side edge of the glass plate and the rear side edge of the anti-fogging film overlap, Sb [mm 2 ] is set to 0. When the rear side edge of the glass plate and the rear side edge of the anti-fogging film are spaced apart, measurement points are provided at 1 mm intervals on the rear side edge of the anti-fogging film from one end point to the other end point, and the shortest line segment is drawn from each measurement point to the rear side edge of the glass plate, and the total length [mm] of all the line segments is calculated as Sb [mm 2 ]. When the upper edge of the glass plate and the upper edge of the anti-fogging film overlap, Su [mm 2 ] is set to 0. When the upper edge of the glass plate and the upper edge of the anti-fogging film are spaced apart, measurement points are provided on the upper edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment is drawn from each measurement point to the upper edge of the glass plate. The total length [mm] of all the line segments is calculated as Su [mm 2 ]. [Effects of the Invention]

[0009] In the vehicle side glass of the present invention, fogging spreads to the rear side edge and / or upper edge of the glass sheet, which has a larger total area than the front side edge of the glass sheet, before the front side edge of the glass sheet. Before the front portion of the side glass fogging up, the driver or passenger knows that they are in an environment prone to fogging and can take measures to prevent fogging. The vehicle side glass of the present invention can suppress fogging in the front portion of the side glass, thereby suppressing a decrease in visibility in the side mirror and improving driving safety. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic plan view of a vehicle side glass according to an embodiment of the present invention; [Figure 2] 1 is a schematic cross-sectional view of a vehicle side glass according to an embodiment of the present invention. [Figure 3A]1 is a schematic cross-sectional view of a first aspect of a vehicle side glass according to an embodiment of the present invention. [Figure 3B] FIG. 2 is a schematic cross-sectional view of a second aspect of a vehicle side glass according to an embodiment of the present invention. [Figure 3C] FIG. 3 is a schematic cross-sectional view of a third aspect of a vehicle side glass according to an embodiment of the present invention. [Figure 4] FIG. 10 is an explanatory diagram of a method for identifying each side of the anti-fogging film. DETAILED DESCRIPTION OF THE INVENTION

[0011] Generally, thin film structures are referred to as "films" or "sheets" depending on their thickness. In this specification, no clear distinction is made between these terms. Therefore, in this specification, "films" may include "sheets." In this specification, unless otherwise specified, the term "surface of a glass plate" refers to the main surface having the largest area, excluding the end faces (also called side faces) of the glass plate. In this specification, unless otherwise specified, the forward direction of a vehicle is defined as the forward direction, and the backward direction of a vehicle is defined as the rearward direction. Furthermore, unless otherwise specified, the terms "front and rear," "up and down," "left and right," "vertical and horizontal," and "inside and outside" refer to the state in which the vehicle side glass is fitted into the vehicle (actual state of use). In this specification, unless otherwise specified, ultraviolet light is light in the wavelength range of 300 to 380 nm, and infrared light is light in the wavelength range of 780 to 2500 nm. In this specification, unless otherwise specified, the use of "to" indicating a range of values ​​means that the values ​​before and after it are included as the lower and upper limits. Hereinafter, an embodiment of the present invention will be described.

[0012] [Vehicle side glass] The structure of a vehicle side glass according to one embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic plan view of the vehicle side glass according to this embodiment. Fig. 2 is a schematic cross-sectional view (cross-sectional view taken along line II-II) of the vehicle side glass according to this embodiment. Figs. 3A to 3C are schematic cross-sectional views of first to third aspects of the vehicle side glass according to this embodiment. For ease of viewing, the scale of each component has been appropriately changed from the actual scale.

[0013] 1 and 2, a vehicle side glass 1 of this embodiment includes a glass plate 10 and an anti-fogging film 50 that is present on the interior surface SI of the glass plate 10. The anti-fogging film 50 is a film that contains a water-absorbent resin or a hydrophilic resin. In this embodiment, when the forward direction of the vehicle is defined as the forward direction and the backward direction of the vehicle is defined as the rearward direction, the glass plate 10 has, in a plan view when fitted into the vehicle, a front side edge 11 (side AB), a rear side edge 12 (side CD), an upper side edge 13 (side AD), and a lower side edge 14 (side BC). The planar shape of the glass plate 10 is designed appropriately depending on the vehicle model, etc. Each side of the glass plate 10 may be a single straight line, a combination of multiple straight lines, a single curved line, or a combination of one or more straight lines and one or more curved lines.

[0014] In this embodiment, the anti-fogging film 50 is smaller than the glass plate 10, and when the forward direction of the vehicle is defined as the forward direction and the backward direction of the vehicle is defined as the rearward direction, when fitted into the vehicle, in a plan view, it has a front side edge 51, a rear side edge 52, an upper edge 53, and a lower edge 54. Each side of the anti-fogging film 50 may be a single straight line, a combination of multiple straight lines, a single curve, or a combination of one or more straight lines and one or more curves.

[0015] There are no particular limitations on the method for providing the anti-fogging film 50 on the glass plate 10. Examples include Method 1, in which an anti-fogging film with an adhesive layer, which has a laminated structure of anti-fogging film / substrate film / adhesive layer, is attached to the surface of the glass plate; Method 2, in which a release film, which has a laminated structure of release film / anti-fogging film / adhesive layer, and an anti-fogging film with an adhesive layer are attached to the surface of the glass plate, and then the release film is peeled off; and Method 3, in which an anti-fogging coating film is formed on the surface of the glass plate as the anti-fogging film. By the above method 1, it is possible to provide a vehicle side glass 1X of the first embodiment to which an anti-fog film 5X with an adhesive layer, which includes an adhesive layer 30, a substrate film 40, and an anti-fog film 50, is attached, as shown in FIG. 3A. By the above method 2, it is possible to provide a vehicle side glass 1Y of the second embodiment, in which an anti-fogging film 5Y with an adhesive layer, including an adhesive layer 30 and an anti-fogging film 50, is attached to the surface of the glass plate 10, as shown in FIG. 3B. By the above-mentioned method 3, it is possible to provide a vehicle side glass 1Z of the third embodiment shown in FIG. 3C, in which an anti-fogging coating film 5Z is formed as the anti-fogging film 50 on the surface of the glass plate 10. The method for forming the antifogging film 50 will be described later.

[0016] The anti-fogging film 50 can be provided over a relatively wide area including the center or central portion of the glass plate 10 . Depending on the shape of the glass plate 10, it may not be possible to clearly define the "center." In this case, a similar shape is drawn by shrinking the same distance inward from the periphery to make the area as small as possible, and the region of this similar shape is defined as the central portion. In the vehicle side glass 1 of this embodiment, an anti-fogging film-free area 71 is provided on the front side edge portion including the front side edge 11 of the glass plate 10 and its vicinity. In the vehicle side glass 1 of this embodiment, there is an area where the anti-fogging film is not present at at least one of the rear side end portion including the rear side edge 12 of the glass plate 10 and its surrounding area, and the upper end portion including the upper edge 13 of the glass plate 10 and its surrounding area. In this specification, unless otherwise specified, "a portion in the vicinity of a certain side" means a range within 100 mm from the certain side.

[0017] In the illustrated example, there are anti-fogging film-free regions at both the rear side edge and the upper edge of the glass plate 10. In the drawing, reference numeral 72 indicates the rear-side anti-fogging film-free region, and reference numeral 73 indicates the upper-side anti-fogging film-free region. The glass plate 10 may have a configuration in which the anti-fogging film-free area is present only at one of the rear side edge and the upper edge. An anti-fogging film-free area 74 may be present at the lower edge of the glass plate 10, including the lower side 14 and its vicinity. In the drawing, the area where the anti-fogging film is not present is shown broadly for ease of viewing.

[0018] The planar shape of the glass plate 10 and / or the planar shape of the anti-fogging film 50 may have chamfered corners. When the anti-fogging film 50 has chamfered corners, the anti-fogging film 50, which is attached over an area smaller than the glass plate 10, is less noticeable, which is preferable.

[0019] When the anti-fogging film 50 has a shape with chamfered corners, the anti-fogging film 50 does not have a clear vertex. In such a case, each side of the anti-fogging film 50 is identified as follows. This will be explained with reference to Figure 4. Figure 4 is a schematic plan view corresponding to Figure 1, and the planar shapes of the glass plate 10 and the anti-fogging film 50 are different from those in Figure 1. Figure 4 shows an example of the planar shape of the anti-fogging film 50 whose vertices are difficult to identify. The maximum width of the anti-fogging film 50 in the front-to-rear direction is defined as Wa. In the outline of the anti-fogging film 50, the portion within the range of the forward 10% of the maximum width Wa is defined as the "forward side edge 51." In the drawing, the symbol Wf indicates the range of the forward 10% of the maximum width Wa. In the forward side edge 51, the upper end point is point E and the lower end point is point F. The portion of the maximum width Wa that falls within the range of 10% toward the rear is defined as the "rear side edge 52." In the drawing, the symbol Wb indicates the range of 10% toward the rear of the maximum width Wa. The upper end point of the rear side edge 52 is point H, and the lower end point is point G. In the figure, the 10% range is shown enlarged for ease of viewing. In the contour of the anti-fogging film 50, the portion between the upper end point (point E) of the front side edge 51 and the upper end point (point H) of the rear side edge 52 is defined as the "upper side 53." In the contour of the anti-fogging film 50, the portion between the lower end point (point F) of the front side edge 51 and the lower end point (point G) of the rear side edge 52 is defined as the "lower side 54."

[0020] The vehicle side glass 1 of this embodiment satisfies the following formula (1). Sb + Su > Sf (1) In the above formula, Sf is the area [mm 2 ], and Sb is the area [mm 2 ], and Su is the area [mm 2 ]. Measurement points are provided at 1 mm intervals on the front side edge 51 of the anti-fogging film from one end point to the other end point, and the shortest line segment is drawn at each measurement point to the front side edge 11 of the glass plate. The total length [mm] of all the line segments is calculated as Sf [mm 2 ]. When the rear side edge 12 of the glass plate and the rear side edge 52 of the anti-fogging film overlap, Sb [mm 2 ] is set to 0. When the rear side edge 12 of the glass plate and the rear side edge 52 of the anti-fogging film are separated (including when they are partially separated), measurement points are provided on the rear side edge 52 of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment is drawn to the rear side edge 12 of the glass plate for each measurement point. The total length [mm] of all the line segments is calculated as Sb [mm 2 ]. When the upper edge 13 of the glass plate and the upper edge 53 of the anti-fogging film overlap, Su [mm 2 ] is set to 0. When the upper edge 13 of the glass plate and the upper edge 53 of the anti-fogging film are separated (including when they are partially separated), measurement points are set at 1 mm intervals on the upper edge 53 of the anti-fogging film from one end point to the other end point, and the shortest line segment is drawn to the upper edge 13 of the glass plate for each measurement point. The total length [mm] of all the line segments is calculated as Su [mm 2].

[0021] As explained in the section [Background Art], the inventors conducted actual vehicle driving tests on a vehicle with an anti-fogging film applied to its side glass, and found that, depending on the environment outside and inside the vehicle, the vehicle side glass may fog up even if it has an anti-fogging film. In a vehicle such as an automobile, if the front portion of the driver's or passenger's side window becomes fogged up, visibility in the side mirrors is reduced, which reduces driving safety, which is undesirable.

[0022] In conventional vehicle side glass, an anti-fogging film is generally provided on substantially the entire surface of the glass plate to prevent fogging. In contrast, the vehicle side glass 1 of this embodiment intentionally provides an area where no anti-fogging film is present on the glass plate 10. Fogging is more likely to occur in the area where no anti-fogging film is present than in the area where the anti-fogging film is present. In this embodiment, by providing a partial area where no anti-fogging film is present, where fogging is more likely to occur, it is easy to detect that the vehicle is in an environment where fogging is likely to occur.

[0023] Specifically, the vehicle side glass 1 of this embodiment has an anti-fogging film-free region 71 at the front side edge of the glass plate 10, and further has an anti-fogging film-free region (anti-fogging film-free regions 72 and / or 73) at at least one of the rear side edge and the upper edge of the glass plate 10. The total area of ​​the latter anti-fogging film-free regions 72 and / or 73 is designed to be larger than the area of ​​the former anti-fogging film-free region 71.

[0024] In a vehicle side glass 1 having such a configuration, in an environment where fogging is likely to occur, fogging spreads to the rear side edge and / or top edge (rear portion and / or upper portion) of the glass plate 10, which has a larger total area than the front side edge of the glass plate 10, before the front side edge (front portion) of the glass plate 10. Therefore, when a driver or passenger notices fogging at the rear side edge and / or top edge (rear portion and / or upper portion) of the side glass before the front side edge (front portion) of the side glass fogging up, the driver or passenger knows that the environment is prone to fogging and can take measures to prevent fogging. Measures to prevent fogging include operating the air conditioner to dehumidify the interior of the vehicle, introducing outside air into the vehicle, and operating a device to eliminate fogging, such as a defroster or defogger. According to the vehicle side glass 1 of this embodiment, the above findings and measures can be used to prevent fogging of the front portion of the side glass, thereby preventing a decrease in visibility in the side mirror and improving driving safety.

[0025] The total area of ​​the glass plate 10 is Sa. Sa is designed depending on the vehicle model, and is, for example, 2.5×10 5 ~4.0×10 5 mm 2 That's about it. The ratio of Sf to Sa (Sf / Sa×100[%]) is preferably small, since this suppresses fogging of the front portion of the side window. The ratio of Sf to Sa is preferably 0.4% or less, more preferably 0.3% or less, and particularly preferably 0.2% or less. The lower limit of the ratio of Sf to Sa is, for example, 0.05%.

[0026] The larger Sb+Su is, the more easily the rear and / or upper part of the vehicle will be fogged. However, if Sb+Su is too large, the fogged area will be wider, possibly reducing driving visibility. From the viewpoint of a balance between the ease of detecting fogging in the rear and / or upper portions and the breadth of driving visibility, the difference between the ratio of Sb+Su to the total area Sa of the glass plate ((Sb+Su) / Sa×100[%]) and the ratio of Sf to the total area Sa of the glass plate (Sf / Sa×100[%]) (i.e., (Sb+Su−Sf) / Sa×100[%]) is preferably 0.2 to 1.4%, more preferably 0.3 to 1.2%, and particularly preferably 0.4 to 1.0%.

[0027] When the antifogging film-free region 72 is present at the rear side edge of the glass plate 10, it is preferable that the following formula (2) be satisfied. Sb>Sf (2) In this case, from the viewpoint of a balance between the ease of noticing fogging in the rear portion and the width of the driving field of view, the difference between the ratio of Sb to the total area Sa of the glass plate (Sb / Sa×100[%]) and the ratio of Sf to the total area Sa of the glass plate (Sf / Sa×100[%]) (i.e., (Sb−Sf) / Sa×100[%]) is preferably 0.03 to 0.4%, more preferably 0.03 to 0.2%, and particularly preferably 0.04 to 0.1%.

[0028] When the antifogging film-free region 73 is present at the upper end of the glass plate 10, it is preferable that the following formula (3) is satisfied. Su>Sf···(3) In this case, from the viewpoint of a balance between the ease of noticing fogging in the upper portion and the width of the driving field of view, the difference between the ratio of Su to the total area Sa of the glass plate (Su / Sa×100[%]) and the ratio of Sf to the total area Sa of the glass plate (Sf / Sa×100[%]) (i.e., (Su−Sf) / Sa×100[%]) is preferably 0.1 to 0.7%, more preferably 0.2 to 0.5%, and particularly preferably 0.2 to 0.4%.

[0029] When the glass plate 10 has an area where the anti-fogging film is not present on both the side edge and the upper edge on the rear side, it is preferable that the following formula (4) be satisfied. Su>Sb (4) The upper anti-fogging film-free area 73 is closer to the driver or passenger and wider than the rear anti-fogging film-free area 72, so if the area Su of the upper anti-fogging film-free area 73 is larger than the area Sb of the rear anti-fogging film-free area 72, it is easier to detect fogging in the rear and upper parts. In this case, from the viewpoint of a balance between the ease of detecting fogging in the rear and upper parts and the breadth of driving visibility, the difference between the ratio of Su to the total area Sa of the glass plate (Su / Sa×100[%]) and the ratio of Sb to the total area Sa of the glass plate (Sb / Sa×100[%]) (i.e., (Su−Sb) / Sa×100[%]) is preferably 0.1 to 0.7%, more preferably 0.1 to 0.5%, and particularly preferably 0.2 to 0.4%.

[0030] (water contact angle) In the anti-fogging film-free areas (anti-fogging film-free areas 72 and / or 73) at least one of the rear side end portion of the glass plate 10 and the upper end portion of the glass plate 10, the water contact angle of the surface SI of the glass plate 10 on the inside of the vehicle is not particularly limited. In the area where the anti-fogging film is not present, the water contact angle of the surface SI of the glass plate 10 facing the interior of the vehicle is usually about 20 to 40° unless special treatment is performed. In the anti-fogging film-free regions 72 and / or 73, the water contact angle of the interior surface SI of the glass plate 10 may be set to 50 to 110° by a known water-repellent treatment. In this case, fogging in the rear and / or upper portions is more easily detected. In this specification, unless otherwise specified, the "water contact angle" is determined by the method described in the section [Examples].

[0031] The water-repellent treatment method is not particularly limited, and examples include a method of applying a commercially available water-repellent agent to a desired area of ​​the interior surface SI of the glass plate 10. Examples of water-repellent agents include fluorine-based and silicone-based agents. Examples of application methods include squeegee coating, spray coating, wipe coating, and die coating. The water contact angle can be adjusted by adjusting the type of water repellent agent and the amount applied per unit area.

[0032] When the anti-fogging film-free region 72 is present at the rear side edge of the glass plate 10, it is preferable that the rear side edge 12 of the glass plate 10 and the rear side edge 52 of the anti-fogging film 50 are substantially parallel to each other. In this case, fogging occurs in the rear portion of the glass plate 10 in a rectangular or nearly rectangular shape, making it easier to detect the fogging. Similarly, when the anti-fogging film-free region 73 is present at the upper end of the glass plate 10, it is preferable that the upper edge 13 of the glass plate 10 and the upper edge 53 of the anti-fogging film 50 are substantially parallel to each other. In this case, fogging occurs in the upper part of the glass plate 10 in a rectangular or nearly rectangular shape, making it easier to detect the fogging. In this specification, "two sides are approximately parallel" is defined as two sides that are completely parallel or the intersection angle of the extensions of the two sides is 30° or less. If the sides are not straight, an approximate straight line is obtained to determine the intersection angle.

[0033] (glass plate) Examples of the glass plate 10 include laminated glass in which a plurality of glass plates are bonded together via an interlayer, tempered glass, and organic glass, with laminated glass and tempered glass being preferred.

[0034] The type of glass plate that is the material for laminated glass and tempered glass is not particularly limited, and examples include soda lime glass, borosilicate glass, aluminosilicate glass, lithium silicate glass, quartz glass, sapphire glass, and alkali-free glass. Tempered glass is obtained by subjecting the above-mentioned glass plate to tempering processing by a known method such as an ion exchange method or an air-cooling tempering method, etc. As the tempered glass, air-cooling tempered glass is preferred.

[0035] There are no particular restrictions on the thickness of the laminated glass, and it is preferably 2 to 6 mm when used as a side glass for a vehicle. When the laminated glass is composed of two glass sheets, the thickness of the glass sheet on the interior side of the vehicle and the thickness of the glass sheet on the exterior side of the vehicle may be the same or different. The thickness of the glass sheet on the interior side of the vehicle is preferably 0.3 to 2.3 mm. If the thickness of the glass sheet on the interior side of the vehicle is 0.3 mm or more, handling is easy, and if it is 2.3 mm or less, the mass is not too large. The thickness of the glass sheet on the exterior side of the vehicle is preferably 1.0 to 3.0 mm. If the thickness of the glass sheet on the exterior side of the vehicle is 1.0 mm or more, sufficient strength for stone chip resistance and the like is achieved, and if it is 3.0 mm or less, the mass of the laminated glass is not too large, which is preferable in terms of vehicle fuel efficiency. If the thickness of the glass sheet on the exterior side of the vehicle and the thickness of the glass sheet on the interior side of the vehicle are both 1.8 mm or less, the laminated glass can be made both lightweight and soundproof, and this is preferable.

[0036] The thickness of the tempered glass is not particularly limited, and is preferably 1.5 to 6 mm for use as a vehicle side glass. If the thickness of the tempered glass is 1.5 mm or more, it is easy to obtain tempered glass in which the surface compressive stress and the corresponding internal tensile stress satisfy the fracture standard in the air-cooling tempering method.

[0037] The vehicle side glass may have a curved shape such that the outer side of the vehicle is convex when attached to the vehicle. Gravity forming, press forming, roller forming, or the like is used to bend the vehicle side glass.

[0038] Examples of materials for organic glass include engineering plastics such as polycarbonate (PC); polyethylene terephthalate (PET); acrylic resins such as polymethyl methacrylate (PMMA); polyvinyl chloride; polystyrene (PS); and combinations of these, with engineering plastics such as polycarbonate (PC) being preferred.

[0039] The laminated glass and tempered glass may have a light-shielding layer in a predetermined region. The light-shielding layer can be formed by a known method, for example, by applying a ceramic paste containing a black pigment and glass frit to a predetermined region on the surface of a glass plate or tempered glass, which is the material for the laminated glass, and then firing the paste. The thickness of the light-shielding layer is not particularly limited and is, for example, 5 to 20 μm. The light-shielding layer can be formed, for example, in the peripheral region of any surface of the laminated glass or tempered glass.

[0040] (Anti-fogging film) The anti-fogging coating may contain one or more water-absorbent or hydrophilic resins. The anti-fogging film preferably further contains one or more metal oxides including silica in order to ensure the strength, particularly the abrasion resistance, of the anti-fogging film. The content of the water-absorbent resin and / or hydrophilic resin in the anti-fogging film is not particularly limited, and from the viewpoints of film hardness, water absorbency, and anti-fogging properties, it is preferably 50% by mass or more, more preferably 60% by mass or more, and particularly preferably 65% ​​by mass or more, and is preferably 95% by mass or less, more preferably 90% by mass or less, and particularly preferably 85% by mass or less. In this specification, unless otherwise specified, the "content of water-absorbent resin and / or hydrophilic resin" means the total content when the anti-fogging film contains multiple types of water-absorbent or hydrophilic resins.

[0041] <Water-absorbent resin or hydrophilic resin> The water-absorbent resin or hydrophilic resin is not particularly limited, and examples thereof include polyethylene glycol, polyether resins, polyurethane resins, starch resins, cellulose resins, acrylic resins, epoxy resins, polyester polyols, hydroxyalkyl cellulose, polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl acetal resins, and polyvinyl acetate. Among these, hydroxyalkyl cellulose, polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl acetal resin, polyvinyl acetate, epoxy resin, polyurethane resin, etc. are preferred, polyvinyl acetal resin, epoxy resin, polyurethane resin, etc. are more preferred, and polyvinyl acetal resin, epoxy resin, etc. are particularly preferred.

[0042] Polyvinyl acetal resins can be synthesized by acetalizing polyvinyl alcohol through a condensation reaction with an aldehyde. Methods for acetalizing polyvinyl alcohol include a precipitation method using an aqueous medium in the presence of an acid catalyst and a dissolution method using a solvent such as alcohol. Acetalization may be carried out in parallel with the saponification of polyvinyl acetate.

[0043] Aldehydes to be condensed with polyvinyl alcohol include aliphatic aldehydes and aromatic aldehydes. Aliphatic aldehydes include formaldehyde, acetaldehyde, butylaldehyde, hexylcarbaldehyde, octylcarbaldehyde, and decylcarbaldehyde. Aromatic aldehydes include benzaldehyde; alkyl-substituted benzaldehydes such as 2-methylbenzaldehyde, 3-methylbenzaldehyde, and 4-methylbenzaldehyde; halogen-substituted benzaldehydes such as chlorobenzaldehyde; substituted benzaldehydes in which hydrogen atoms are substituted with functional groups other than alkyl groups, such as hydroxyl groups, alkoxy groups, amino groups, and cyano groups; and condensed aromatic ring aldehydes such as naphthaldehyde and anthraldehyde.

[0044] The degree of acetalization of the polyvinyl acetal resin is not particularly limited, and is preferably 2 to 40 mol%, more preferably 3 to 30 mol%, particularly preferably 5 to 20 mol%, and most preferably 5 to 15 mol%, because this is advantageous for forming an anti-fogging film with good water absorption and water resistance. 13 It can be measured by C nuclear magnetic resonance spectroscopy. The average polymerization degree of polyvinyl alcohol is not particularly limited, and since this is advantageous for forming an anti-fogging film with good water absorption and water resistance, it is preferably 200 to 4500, more preferably 500 to 4500. The saponification degree of polyvinyl alcohol is preferably 75 to 99.8 mol %.

[0045] Examples of epoxy resins include glycidyl ether epoxy resins, glycidyl ester epoxy resins, glycidyl amine epoxy resins, and alicyclic epoxy resins, among which alicyclic epoxy resins are preferred.

[0046] Examples of polyurethane resins include those obtained by copolymerizing one or more polyisocyanates having two or more isocyanate groups in one molecule with one or more polyols having two or more hydroxyl groups in one molecule. Preferred polyols include acrylic polyols and polyoxyalkylene polyols.

[0047] <Metal oxides> The metal oxide may be an oxide of at least one metal element selected from Si, Ti, Zr, Ta, Nb, Nd, La, Ce, and Sn. To ensure the strength, particularly the abrasion resistance, of the anti-fogging film, the anti-fogging film may contain one or more metal oxides including silica. The content of metal oxide in the anti-fogging film (the total content when the anti-fogging film contains multiple types of metal oxide) is not particularly limited. The higher the content of metal oxide, the higher the strength, particularly the abrasion resistance, of the anti-fogging film. However, a decrease in the content of water-absorbent resin and / or hydrophilic resin reduces the anti-fogging properties. From the viewpoint of the balance between the strength and anti-fogging properties of the anti-fogging film, the preferred content of metal oxide is as follows: The content of the metal oxide is preferably 0.01 parts by mass or more, more preferably 0.1 parts by mass or more, even more preferably 0.2 parts by mass or more, even more preferably 1 part by mass or more, and most preferably 5 parts by mass or more, and may be 10 parts by mass or more or 20 parts by mass or more, relative to 100 parts by mass of the content of the water-absorbent resin and / or hydrophilic resin. The content of the metal oxide is preferably 50 parts by mass or less, more preferably 45 parts by mass or less, even more preferably 40 parts by mass or less, particularly preferably 35 parts by mass or less, most preferably 33 parts by mass or less, and may be 30 parts by mass or less.

[0048] The form of the metal oxide contained in the anti-fogging film is not particularly limited. At least a portion of the metal oxide can be in the form of fine particles. Metal oxide fine particles are excellent at transmitting stress applied to the anti-fogging film to the glass plate supporting the anti-fogging film, and also have high hardness. Therefore, the addition of metal oxide fine particles is advantageous from the viewpoint of improving the abrasion resistance of the anti-fogging film. Furthermore, when metal oxide fine particles are added to the anti-fogging film, fine voids are formed in the areas where the fine particles are in contact or in close proximity, and water vapor is easily absorbed into the film through these voids. Therefore, the addition of metal oxide fine particles can be advantageous in improving the anti-fogging properties. Metal oxide fine particles can be added to an anti-fogging film by adding metal oxide fine particles or a dispersion containing the metal oxide fine particles to a liquid composition for forming an anti-fogging film (also referred to as a composition for an anti-fogging film). Examples of dispersions containing metal oxide fine particles include colloidal silica.

[0049] The average particle size of the metal oxide fine particles is not particularly limited, but is preferably 1 to 20 nm, more preferably 5 to 20 nm, from the viewpoint of preventing the anti-fogging film from becoming cloudy and ensuring uniform dispersion of the fine particles. The "average particle size" referred to here is the average particle size of primary particles, and is the average value of particle sizes of 50 arbitrarily selected fine particles measured by observation with a scanning electron microscope (SEM). The content of the metal oxide microparticles is not particularly limited, and from the viewpoint of suppressing clouding of the anti-fogging film and ensuring anti-fogging properties, it is preferably 0 to 50 parts by mass, more preferably 2 to 30 parts by mass, particularly preferably 5 to 25 parts by mass, and most preferably 10 to 20 parts by mass relative to 100 parts by mass of the water-absorbing resin and / or hydrophilic resin.

[0050] <Hydrolyzable metal compounds> As the metal oxide material, a metal compound having a hydrolyzable group (also referred to as a hydrolyzable metal compound) and / or its hydrolyzate can be used. Examples of the hydrolyzable metal compound include a silicon compound having a hydrolyzable group (also referred to as a silicon compound (I)) represented by the following formula (I): The anti-fogging film may contain silica derived from the silicon compound (I) and / or its hydrolyzate. In this specification, the term "silica" also refers to silicon compounds containing siloxane bonds in which an organic metal is directly bonded to part of the silicon.

[0051] R m Six 4-m (I) In the above formula (I), R is a hydrocarbon group having 1 to 3 carbon atoms in which a hydrogen atom may be substituted with a reactive functional group. Examples of the hydrocarbon group having 1 to 3 carbon atoms include alkyl groups having 1 to 3 carbon atoms (specifically, methyl, ethyl, n-propyl, and isopropyl) and alkenyl groups having 2 to 3 carbon atoms (specifically, vinyl, allyl, and propenyl).

[0052] The reactive functional group is preferably at least one selected from an oxyglycidyl group and an amino group. The hydrolyzable metal compound having a reactive functional group can firmly bond the water-absorbing resin and / or hydrophilic resin, which are organic substances, with silica, which is a metal oxide, and can contribute to improving the abrasion resistance, hardness, etc. of the anti-fogging film.

[0053] In the above formula (I), X is a hydrolyzable group or a halogen atom. Examples of the hydrolyzable group include at least one selected from an alkoxyl group, an acetoxy group, an alkenyloxy group, and an amino group. Examples of the alkoxyl group include alkoxyl groups having 1 to 4 carbon atoms (specifically, methoxy, ethoxy, propoxy, and butoxy groups). Examples of the hydrolyzable group include an alkoxyl group, and more preferably an alkoxyl group having 1 to 4 carbon atoms. Examples of the halogen atom include chlorine, etc.

[0054] In the above formula (I), m is an integer of 0 to 2, and preferably an integer of 0 to 1.

[0055] A preferred example of the silicon compound (I) is a silicon alkoxide in which X is an alkoxyl group. The silicon alkoxide preferably includes a compound in which m=0 (SiX4, a tetrafunctional silicon alkoxide). Specific examples of the tetrafunctional silicon alkoxide include tetramethoxysilane and tetraethoxysilane.

[0056] The silicon alkoxide more preferably contains the above-mentioned tetrafunctional silicon alkoxide and a compound where m=1 (RSiX3, trifunctional silicon alkoxide). Specific examples of trifunctional silicon alkoxides without reactive functional groups include methyltriethoxysilane, ethyltriethoxysilane, and n-propyltriethoxysilane. Specific examples of trifunctional silicon alkoxides with reactive functional groups include glycidoxyalkyltrialkoxysilanes (e.g., 3-glycidoxypropyltrimethoxysilane), aminoalkyltrialkoxysilanes (e.g., 3-aminopropyltriethoxysilane), and the like.

[0057] Silicon alkoxides having reactive functional groups are also called silane coupling agents. Even in compounds where m=2 (R2SiX2, bifunctional silicon alkoxides), compounds in which at least one R is a reactive functional group are silane coupling agents. Specific examples of bifunctional silicon alkoxides in which at least one R has a reactive functional group include glycidoxyalkylalkyldialkoxysilanes (e.g., 3-glycidoxypropylmethyldimethoxysilane, etc.) and aminoalkylalkyldialkoxysilanes (e.g., N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, etc.).

[0058] When the hydrolysis and polycondensation of silicon compound (I) are completed, a compound represented by the following formula (II) (also referred to as silicon compound (II)) is produced. R and m in formula (II) are as described above. R m SiO( 4-m) / 2 (II) The silicon compound (II) can form a three-dimensional network structure of siloxane bonds (Si—O—Si) in the anti-fogging film.

[0059] The anti-fogging film must be flexible enough to swell or shrink as it absorbs or releases moisture. From the viewpoint of flexibility, the content of silica derived from tetrafunctional silicon alkoxide in the anti-fogging film is preferably 0 to 30 parts by mass, more preferably 1 to 20 parts by mass, and particularly preferably 3 to 10 parts by mass, per 100 parts by mass of the water-absorbent resin and / or hydrophilic resin. The content of silica derived from trifunctional silicon alkoxide is preferably 0 to 30 parts by mass, more preferably 0.05 to 15 parts by mass, and particularly preferably 0.1 to 10 parts by mass, per 100 parts by mass of the water-absorbent resin and / or hydrophilic resin.

[0060] <Crosslinked structure> The anti-fogging film may contain a crosslinked structure derived from a crosslinking agent made of an organometallic compound such as an organoaluminum compound, an organoboron compound, an organotitanium compound, or an organozirconium compound. The introduction of a crosslinked structure can improve the abrasion resistance and water resistance of the anti-fogging film. The introduction of a crosslinked structure facilitates improving the durability of the anti-fogging film without reducing its anti-fogging performance. The crosslinking agent made of an organometallic compound is not particularly limited as long as it can crosslink the water-absorbent resin and / or hydrophilic resin used, and examples thereof include metal alkoxides, metal chelate compounds, and metal acylates. Here, specific examples of crosslinking agents will be given, taking the case where the metal contained in the organometallic compound is titanium as an example. Examples of titanium alkoxides include titanium tetraisopropoxide, titanium tetra-n-butoxide, and titanium tetraoctoxide. Examples of titanium chelate compounds include titanium acetylacetonate, titanium ethyl acetoacetate, titanium octylene glycol, titanium triethanolamine, and titanium lactate. Titanium lactate may be an ammonium salt (i.e., titanium ammonium lactate). Examples of titanium acylates include titanium stearate.

[0061] <Optional ingredients> The anti-fogging film may contain one or more optional components other than those described above, as necessary, such as ultraviolet shielding agents, infrared shielding agents, glycols such as glycerin and ethylene glycol that have the function of improving anti-fogging properties, surfactants, interfacial modifiers, slip imparting agents, leveling agents, antifoaming agents, and preservatives.

[0062] <UV screening agent> Any known ultraviolet shielding agent can be used, and may be either an ultraviolet absorbing type or an ultraviolet reflecting type, with ultraviolet absorbing agents being preferred. Examples of ultraviolet absorbers include benzotriazole compounds such as 2-(2'-hydroxy-5'-methylphenyl)benzotriazole and 2-(2'-hydroxy-3',5'-di-t-butylphenyl)benzotriazole; benzophenone compounds such as 2,2',4,4'-tetrahydroxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, and 5,5'-methylenebis(2-hydroxy-4-methoxybenzophenone); 2-(2-hydroxy-4-octoxyphenyl)-4,6-bis(2,4-di-t-butylphenyl)-s-triazine, 2-( hydroxyphenyltriazine compounds such as 2-hydroxy-4-methoxyphenyl)-4,6-diphenyl-s-triazine and 2-(2-hydroxy-4-propoxy-5-methylphenyl)-4,6-bis(2,4-di-t-butylphenyl)-s-triazine; cyanoacrylate compounds such as ethyl-α-cyano-β,β-diphenylacrylate and methyl-2-cyano-3-methyl-3-(p-methoxyphenyl)acrylate; organic dyes such as polymethine compounds, imidazoline compounds, coumarin compounds, naphthalimide compounds, perylene compounds, azo compounds, isoindolinone compounds, quinophthalone compounds, and quinoline compounds; and the like. The amount of the ultraviolet absorber to be added is not particularly limited, and is preferably 0.1 to 50 parts by mass, more preferably 1.0 to 40 parts by mass, and particularly preferably 2 to 35 parts by mass, per 100 parts by mass of the water-absorbing resin and / or hydrophilic resin.

[0063] <Infrared shielding agent> Examples of the infrared absorber include organic infrared absorbers such as polymethine compounds, cyanine compounds, phthalocyanine compounds, naphthalocyanine compounds, naphthoquinone compounds, anthraquinone compounds, dithiol compounds, immonium compounds, diimonium compounds, aminium compounds, pyrylium compounds, cerium compounds, squarylium compounds, and counterion conjugates of benzenedithiol metal complex anions and cyanine dye cations; and inorganic infrared absorbers such as tungsten oxide, tin oxide, indium oxide, magnesium oxide, titanium oxide, chromium oxide, zirconium oxide, nickel oxide, aluminum oxide, zinc oxide, iron oxide, ammonium oxide, lead oxide, bismuth oxide, lanthanum oxide, tungsten oxide, indium tin oxide (ITO), and antimony tin oxide. The infrared absorbing agent is preferably an inorganic infrared absorbing agent, and its form is preferably fine particles. The amount of the infrared absorbent added is preferably 0.1 to 50 parts by mass, more preferably 1.0 to 40 parts by mass, and particularly preferably 2 to 35 parts by mass, relative to 100 parts by mass of the water-absorbing resin and / or hydrophilic resin.

[0064] <Film thickness> The thickness of the anti-fogging film can be designed depending on the required anti-fogging performance, and is preferably 1 to 20 μm, more preferably 2 to 15 μm, and particularly preferably 3 to 10 μm.

[0065] <Anti-fogging film deposition method> As methods for providing an anti-fogging film on a glass plate, the following methods have been explained: Method 1, in which an anti-fogging film with an adhesive layer, which has a laminated structure of anti-fogging film / substrate film / adhesive layer, is attached to the surface of the glass plate; Method 2, in which a release film, which has a laminated structure of release film / anti-fogging film / adhesive layer, and an anti-fogging film with an adhesive layer are attached to the surface of the glass plate, and then the release film is peeled off; and Method 3, in which an anti-fogging coating film is formed as an anti-fogging film on the surface of the glass plate.

[0066] The anti-fogging film can be formed on the surface of the substrate film, release film or glass plate by a known method. The method for forming an anti-fogging film includes the steps of preparing a liquid anti-fogging film composition containing a water-absorbing resin and / or a hydrophilic resin and a solvent, and preferably containing a metal oxide or a material thereof; applying the anti-fogging film composition onto the surface of a substrate film, a release film, or a glass plate (application step); and drying the applied film (drying step).

[0067] The coating method is not particularly limited, and examples thereof include die coating, spin coating, flow coating, and roll coating. The coating step is preferably carried out in an atmosphere with a low relative humidity (RH), preferably 40% or less, more preferably 30% or less, to prevent the coating film from absorbing excessive moisture from the atmosphere and the remaining moisture from reducing the strength of the anti-fogging film.

[0068] The drying method is not particularly limited, and examples thereof include air drying, drying under reduced pressure, drying by heating, drying by heating under reduced pressure, and combinations thereof. The air drying step is preferably carried out in an atmosphere with low relative humidity (RH), similar to the coating step. The drying step preferably includes a heat drying step. When the anti-fogging film composition contains a hydrolyzable metal compound such as a hydrolyzable silicon compound, the drying step includes a heat drying step in which the hydrolyzable metal compound is hydrolyzed and polycondensed by heating to produce a metal oxide. The heating temperature is a temperature at which the hydrolysis and polycondensation of the hydrolyzable metal compound proceeds but the water-absorbent resin and / or the hydrophilic resin does not decompose, and is preferably 80 to 300°C, more preferably 100 to 200°C.

[0069] Examples of methods for producing an anti-fog film with an adhesive layer used in Method 1 include a method comprising the steps of forming an anti-fog film on one surface of a base film and forming an adhesive layer on the other surface of the base film; and a method comprising the steps of preparing an adhesive film having a base film and an adhesive layer formed on one surface of the base film, and forming an anti-fog film on the other surface of the base film of this adhesive film. The material of the base film is not particularly limited, and examples thereof include polyethylene terephthalate (PET), polycarbonate (PC), cycloolefin polymer (COP), and combinations thereof. The base film may have a single-layer structure or a laminate structure.

[0070] Examples of the method for producing an anti-fog film with a release film and an adhesive layer used in Method 2 include a method including a step of forming an anti-fog film on the surface of a release film and a step of forming an adhesive layer on the anti-fog film. The release film is not particularly limited, and examples thereof include a film in which a release treatment such as silicone coating is applied to the surface of a resin film such as a polyethylene terephthalate (PET) film.

[0071] The method for forming the anti-fogging film has been described above, so a detailed description will be omitted here. The adhesive layer can be formed by applying a known adhesive by a known method, such as an acrylic adhesive, a urethane adhesive, or a silicone adhesive.

[0072] As described above, according to this embodiment, it is possible to provide a vehicle side glass 1 that can suppress fogging of the front portion of the side glass, suppress deterioration of visibility in the side mirror, and improve driving safety. [Example]

[0073] The present invention will be described below based on examples, but the present invention is not limited to these. Examples 1 to 17 are examples, and Examples 21 and 22 are comparative examples.

[0074] [Evaluation items and evaluation methods] For the evaluation automobiles obtained in each example, a driving test was carried out under the following driving conditions until the driver noticed fogging on the side windows. The noticeability of fogging and driving visibility were evaluated according to the following criteria. The side windows began to fogging up approximately 10 to 15 minutes after the start of driving.

[0075] (Operating conditions) Windows: Close all windows completely. Air conditioning in the car: Air conditioning is off, recirculation mode, Operating hours: 11pm to 3am Outside the car: 0°C, relative humidity 80%, In-car environment: 5.1℃, relative humidity 48%, Driving speed: 60km / hr.

[0076] (Cloudy awareness) The driver was evaluated based on the following criteria to see whether he noticed fogging in other areas before the front edge of the side window (front portion) fogging up, and how easily he noticed it. The evaluation of "ease of noticing" was a sensory evaluation. Excellent (◎): The driver noticed fogging in other areas of the side window before the front part fogging up. Also, it was easy for the driver to notice fogging in other areas. Good (○): The driver noticed fogging in other areas before the front part of the side window fogging up. It was not easy to notice fogging in other areas. Poor (x): The driver did not notice fogging in other parts of the side window before the front part of the window fogging up. When the driver noticed fogging in the side window, fogging was already visible in the front part of the window.

[0077] (Driving visibility) When fogging of the side window was confirmed, the driving visibility was evaluated sensorily according to the following criteria. Excellent (◎): Driving visibility is sufficiently wide. Good (○): Driving visibility is wide and no problems. Poor (×): Driving visibility is poor.

[0078] (water contact angle) The water contact angle on the interior surface of the vehicle was measured in the area of ​​the rear or upper side of the side glass where no anti-fog film was present. The side glass was placed on a horizontal surface with the interior surface facing up. A 50 μL water droplet was placed on the interior surface of the rear or upper side of the side glass where no anti-fog film was present, and the water contact angle was measured using the θ / 2 method with a motion analysis microscope (Keyence Corporation, "VW6000"). Measurements were taken at five different locations, and the average value was calculated.

[0079] [Examples 1-17, 21, 22] (Manufacturing anti-fog film with adhesive layer) <Preparation of chelating compound solution> 3.0 g of aluminum trisacetylacetonate (Sigma-Aldrich) and 97.0 g of methanol (special grade; Junsei Chemical Co., Ltd.) were mixed and stirred at 25° C. for 10 minutes to obtain a chelate compound solution (CL1).

[0080] <Preparation of Anti-Fog Film Composition> A glass container was charged with 31.4 g of a water-soluble epoxy resin (Denacol EX1610, manufactured by Nagase ChemteX Corporation), 33.4 g of the chelating compound solution (CL1), 18.4 g of an alcohol-based mixed solvent (Neoalcohol IPM, manufactured by Taishin Chemical Co., Ltd., a mixed solvent of ethanol, methanol, and isopropyl alcohol), 8.5 g of ion-exchanged water, 0.09 g of 60% by mass nitric acid (manufactured by Junsei Chemical Co., Ltd.), and 8.1 g of an epoxy silane compound (KBM-403, 3-glycidoxypropyltrimethoxysilane, manufactured by Shin-Etsu Chemical Co., Ltd.), and the mixture was stirred at room temperature (20 to 25°C) for 60 minutes to obtain a composition for an anti-fogging film.

[0081] <Anti-fogging film formation> A 100 μm-thick polyethylene terephthalate (PET) film (A4300, manufactured by Toyobo Co., Ltd.) was prepared as a substrate film. The anti-fogging film composition was applied to one surface of this substrate film by a die coating method and maintained at 100° C. for 30 minutes to form an anti-fogging film containing a water-soluble epoxy resin and silica. Next, an adhesive (manufactured by Nitto Denko Corporation, CS9861UAS) was applied to the other surface of the base film to form an adhesive layer with a thickness of 25 μm. In this manner, an anti-fog film with an adhesive layer was obtained.

[0082] (Side glass manufacturing) In each of Examples 1 to 17, 21, and 22, the obtained anti-fog film with an adhesive layer was attached to a glass plate for evaluation, changing the attachment area, as follows: The conditions other than the attachment area of ​​the anti-fog film with an adhesive layer were the same.

[0083] As a glass plate for evaluation, a commercially available side glass (5.0 mm thick tempered glass) on the driver's side of a car with a flat shape as shown in Figure 1 was prepared. The glass plate for evaluation had a front side edge (length: 5.0 × 10 2 mm) and the rear side (length: 8.0 × 10 2 mm) and top edge (length: 1.0 × 10 3 The total area Sa is 2.8 × 10 5 mm 2 That was about it.

[0084] Pure water was sprayed onto the entire surface of the exterior surface of the glass plate for evaluation, and the obtained anti-fog film with an adhesive layer was placed on the exterior surface of the glass plate so that it was aligned with the exterior surface. At this time, the anti-fog film with an adhesive layer was placed on the exterior surface of the glass plate so that the anti-fog film was in contact with the glass plate. In this state, the anti-fog film with an adhesive layer was cut to fit the application area set in each example. The cut anti-fog film with an adhesive layer was attached to the interior surface of the glass plate for evaluation in the attachment area set for each example, with the adhesive layer in contact with the glass plate.

[0085] In all examples, as shown in Figure 1, the anti-fog film with an adhesive layer has a shape with chamfered corners when viewed in a plane, and is configured to have a front side edge, a rear side edge, an upper side, and a lower side, with the front side edge of the glass plate and the front side edge of the anti-fog film being approximately parallel, and the rear side edge of the glass plate and the rear side edge of the anti-fog film being approximately parallel. In both examples, the application area of ​​the anti-fog film with adhesive layer was designed so that, when viewed in a plane, there were areas where the anti-fog film was not present at each of the front side edge, rear side edge, and upper edge.

[0086] In Examples 14 and 15, the interior surfaces of the vehicle in the rear and upper areas where the anti-fog film was not present were subjected to a water-repellent treatment using a commercially available water-repellent agent (Safeview Coat, manufactured by AGC Corporation) as a wipe coat. In Examples 14 and 15, the amount of water-repellent agent applied was varied. In this manner, a side glass was obtained.

[0087] In each example, the area Sf [mm 2 ], the area of ​​the rear anti-fogging film-free region Sb [mm 2 ], and the area of ​​the upper anti-fogging film-free region Su [mm 2 Furthermore, the data for various parameters shown in Table 1 were obtained. The evaluation results are shown in Tables 1 and 2.

[0088] [Table 1]

[0089] [Table 2]

[0090] [Summary of results] In Examples 1 to 17, the application area of ​​the adhesive anti-fog film was designed so that Sb + Su was greater than Sf and satisfied formula (1). In these examples, the driver was able to notice fogging in other areas before the front portion of the side window fogging up. In these examples, the driver can recognize that he is in an environment where fogging is likely to occur before the front part of the side window fogs up and can take measures to prevent fogging, thereby suppressing fogging of the front part of the side window and preventing a decrease in visibility of the side mirror. In these examples, even if fogging occurs in areas other than the forward portion, the area where the adhesive anti-fog film is applied is designed so that the fogging area is sufficiently small, ensuring sufficient driving visibility. In Examples 14 and 15, in which the rear and upper anti-fog film-free areas were subjected to a water-repellent treatment, the water contact angle of the rear and upper anti-fog film-free areas could be increased to 50 to 70°. In these examples, the driver was more likely to notice fogging in areas other than the front area.

[0091] In Examples 21 and 22, Sf was greater than Sb+Su, and formula (1) was not satisfied. In these examples, the driver could not notice the fogging in other parts of the side window before the front part of the window fogging up. [Explanation of symbols]

[0092] 1, 1X, 1Y, 1Z: vehicle side glass, 5X: anti-fog film with adhesive layer, 5Y: anti-fog film with adhesive layer, 5Z: anti-fog coating film, 10: glass plate, 11: front side edge, 12: rear side edge, 13: top edge, 14: bottom edge, 30: adhesive layer, 40: base film, 50: anti-fog film, 51: front side edge, 52: rear side edge, 53: top edge, 54: bottom edge, 71 to 74: areas where the anti-fog film is not present.

Claims

1. A vehicle side glass having a glass plate and an anti-fogging film containing a water-absorbent resin or a hydrophilic resin, the anti-fogging film being present on an interior surface of the glass plate, In plan view, When the forward direction of the vehicle is defined as the forward direction and the backward direction of the vehicle is defined as the rearward direction, the glass plate has a front side edge and a rear side edge and a top edge when fitted into the vehicle, and the anti-fogging film has a front side edge and a rear side edge and a top edge, a region where the anti-fogging film is absent is provided on a front side edge portion of the glass plate, the front side edge including the front side side edge and a portion in the vicinity thereof; a region where the anti-fogging film is absent is present on at least one of a rear side edge portion of the glass plate, which includes the rear side edge and a portion thereof in the vicinity thereof, and an upper edge portion of the glass plate, which includes the upper edge and a portion thereof in the vicinity thereof; A vehicle side glass that satisfies the following formula (1), and the difference between the ratio of Sb+Su to the total area of ​​the glass plate and the ratio of Sf to the total area of ​​the glass plate is 0.2 to 1.4%. Sb+Su>Sf...(1) In the above formula, Sf is the area [mm ２ ], and Sb is the area [mm ２ ], and Su is the area [mm ２ ]. Measurement points were provided on the front side edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment was drawn at each measurement point to the front side edge of the glass plate. The total length [mm] of all the line segments was calculated as Sf [mm ２ ] When the rear side edge of the glass plate and the rear side edge of the anti-fogging film overlap, Sb [mm ２ ] is set to 0. When the rear side edge of the glass plate and the rear side edge of the anti-fogging film are spaced apart, measurement points are provided on the rear side edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment is drawn from each measurement point to the rear side edge of the glass plate, and the total length [mm] of all the line segments is calculated as Sb [mm ２ ] When the upper edge of the glass plate and the upper edge of the anti-fogging film overlap, Su [mm ２ ] is set to 0. When the upper edge of the glass plate and the upper edge of the anti-fogging film are spaced apart, measurement points are provided on the upper edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment is drawn from each measurement point to the upper edge of the glass plate, and the total length [mm] of all the line segments is calculated as Su [mm ２ ]

2. A vehicle side glass having a glass plate and an anti-fogging film containing a water-absorbent resin or a hydrophilic resin, the anti-fogging film being present on an interior surface of the glass plate, In plan view, When the forward direction of the vehicle is defined as the forward direction and the backward direction of the vehicle is defined as the rearward direction, the glass plate has a front side edge and a rear side edge and a top edge when fitted into the vehicle, and the anti-fogging film has a front side edge and a rear side edge and a top edge, a region where the anti-fogging film is absent is provided on a front side edge portion of the glass plate, the front side edge including the front side side edge and a portion in the vicinity thereof; a non-existent region of the anti-fogging film is present at least in the rear side edge portion of the glass plate, which includes the rear side edge and a portion thereof in the vicinity thereof, and an upper edge portion of the glass plate, which includes the upper edge and a portion thereof in the vicinity thereof; A vehicle side glass that satisfies the following formulas (1) and (2), and the difference between the ratio of Sb to the total area of ​​the glass plate and the ratio of Sf to the total area of ​​the glass plate is 0.03 to 0.4%. Sb+Su>Sf...(1) Sb>Sf...(2) In the above formula, Sf is the area [mm ２ ], and Sb is the area [mm ２ ], and Su is the area [mm ２ ]. Measurement points were provided on the front side edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment was drawn at each measurement point to the front side edge of the glass plate. The total length [mm] of all the line segments was calculated as Sf [mm ２ ] When the rear side edge of the glass plate and the rear side edge of the anti-fogging film overlap, Sb [mm ２ ] is set to 0. When the rear side edge of the glass plate and the rear side edge of the anti-fogging film are spaced apart, measurement points are provided on the rear side edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment is drawn from each measurement point to the rear side edge of the glass plate, and the total length [mm] of all the line segments is calculated as Sb [mm ２ ] When the upper edge of the glass plate and the upper edge of the anti-fogging film overlap, Su [mm ２ ] is set to 0. When the upper edge of the glass plate and the upper edge of the anti-fogging film are spaced apart, measurement points are provided on the upper edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment is drawn from each measurement point to the upper edge of the glass plate, and the total length [mm] of all the line segments is calculated as Su [mm ２ ]

3. A vehicle side glass having a glass plate and an anti-fogging film containing a water-absorbent resin or a hydrophilic resin, the anti-fogging film being present on an interior surface of the glass plate, In plan view, When the forward direction of the vehicle is defined as the forward direction and the backward direction of the vehicle is defined as the rearward direction, the glass plate has a front side edge and a rear side edge and a top edge when fitted into the vehicle, and the anti-fogging film has a front side edge and a rear side edge and a top edge, a region where the anti-fogging film is absent is provided on a front side edge portion of the glass plate, the front side edge including the front side side edge and a portion in the vicinity thereof; a region free of the anti-fogging film is present at least in the upper end portion of the rear side edge portion of the glass plate, the rear side edge portion including the rear side edge and a portion adjacent thereto, and an upper end portion of the glass plate, the upper edge portion including the upper edge and a portion adjacent thereto; A vehicle side glass that satisfies the following formulas (1) and (3), and a difference between a ratio of Su to the entire area of ​​the glass plate and a ratio of Sf to the entire area of ​​the glass plate is 0.1 to 0.7%. Sb+Su>Sf...(1) Su>Sf...(3) In the above formula, Sf is the area [mm ２ ], and Sb is the area [mm ２ ], and Su is the area [mm ２ ]. Measurement points were provided on the front side edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment was drawn at each measurement point to the front side edge of the glass plate. The total length [mm] of all the line segments was calculated as Sf [mm ２ ] When the rear side edge of the glass plate and the rear side edge of the anti-fogging film overlap, Sb [mm ２ ] is set to 0. When the rear side edge of the glass plate and the rear side edge of the anti-fogging film are spaced apart, measurement points are provided on the rear side edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment is drawn from each measurement point to the rear side edge of the glass plate, and the total length [mm] of all the line segments is calculated as Sb [mm ２ ] When the upper edge of the glass plate and the upper edge of the anti-fogging film overlap, Su [mm ２ ] is set to 0. When the upper edge of the glass plate and the upper edge of the anti-fogging film are spaced apart, measurement points are provided on the upper edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment is drawn from each measurement point to the upper edge of the glass plate, and the total length [mm] of all the line segments is calculated as Su [mm ２ ]

4. A vehicle side glass having a glass plate and an anti-fogging film containing a water-absorbent resin or a hydrophilic resin, the anti-fogging film being present on an interior surface of the glass plate, In plan view, When the forward direction of the vehicle is defined as the forward direction and the backward direction of the vehicle is defined as the rearward direction, the glass plate has a front side edge and a rear side edge and a top edge when fitted into the vehicle, and the anti-fogging film has a front side edge and a rear side edge and a top edge, a region where the anti-fogging film is absent is provided on a front side edge portion of the glass plate, the front side edge including the front side side edge and a portion in the vicinity thereof; an anti-fogging film-free region is present on both a rear side edge portion of the glass plate, including the rear side edge and a portion thereof in the vicinity thereof, and an upper edge portion of the glass plate, including the upper side edge and a portion thereof in the vicinity thereof; A vehicle side glass that satisfies the following formulas (1) and (4), and the difference between the ratio of Su to the entire area of ​​the glass plate and the ratio of Sb to the entire area of ​​the glass plate is 0.1 to 0.7%. Sb+Su>Sf...(1) Su>Sb...(4) In the above formula, Sf is the area [mm ２ ], and Sb is the area [mm ２ ], and Su is the area [mm ２ ]. Measurement points were provided on the front side edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment was drawn at each measurement point to the front side edge of the glass plate. The total length [mm] of all the line segments was calculated as Sf [mm ２ ] When the rear side edge of the glass plate and the rear side edge of the anti-fogging film overlap, Sb [mm ２ ] is set to 0. When the rear side edge of the glass plate and the rear side edge of the anti-fogging film are spaced apart, measurement points are provided on the rear side edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment is drawn from each measurement point to the rear side edge of the glass plate, and the total length [mm] of all the line segments is calculated as Sb [mm ２ ] When the upper edge of the glass plate and the upper edge of the anti-fogging film overlap, Su [mm ２ ] is set to 0. When the upper edge of the glass plate and the upper edge of the anti-fogging film are spaced apart, measurement points are provided on the upper edge of the anti-fogging film at 1 mm intervals from one end point to the other end point, and the shortest line segment is drawn from each measurement point to the upper edge of the glass plate, and the total length [mm] of all the line segments is calculated as Su [mm ２ ]

5. 5. The vehicle side glass according to claim 2, wherein a difference between a proportion of Sb+Su relative to the total area of ​​the glass plate and a proportion of Sf relative to the total area of ​​the glass plate is 0.2 to 1.4%.

6. a region where the anti-fogging film is absent is provided at the rear side edge of the glass plate; 5. The vehicle side glass according to claim 1, 3 or 4, which satisfies the following formula (2): Sb>Sf...(2)

7. 7. The vehicle side glass according to claim 6, wherein a difference between a proportion of Sb relative to the entire area of ​​the glass plate and a proportion of Sf relative to the entire area of ​​the glass plate is 0.03 to 0.4%.

8. the upper end of the glass plate has an area where the anti-fogging film is not present, The vehicle side glass according to any one of claims 1, 2 and 4 to 7, which satisfies the following formula (3): Su>Sf...(3)

9. 9. The vehicle side glass according to claim 8, wherein a difference between a proportion of Su relative to the entire area of ​​the glass plate and a proportion of Sf relative to the entire area of ​​the glass plate is 0.1 to 0.7%.

10. 10. The vehicle side glass according to claim 1, wherein the anti-fogging film-free area is present at both the rear side end and the upper end of the glass plate, and the following formula (4) is satisfied: Su>Sb...(4)

11. 11. The vehicle side glass according to claim 10, wherein a difference between a proportion of Su relative to the entire area of ​​the glass plate and a proportion of Sb relative to the entire area of ​​the glass plate is 0.1 to 0.7%.

12. a structure in which an anti-fog film with an adhesive layer, the anti-fog film including an adhesive layer, a substrate film, and the anti-fog film, is attached to the surface of the glass plate; A structure in which an anti-fogging film with an adhesive layer, which includes an adhesive layer and the anti-fogging film, is attached to the surface of the glass plate, or The vehicle side glass according to any one of claims 1 to 11, wherein an anti-fogging coating film is formed on the surface of the glass plate as the anti-fogging film.

13. 13. The vehicle side glass according to claim 1, wherein a water contact angle of the vehicle interior surface of the glass plate is 50 to 110° in an area where the anti-fogging film is not present, at least one of the rear side end portion of the glass plate and the upper end portion of the glass plate.

14. 14. The vehicle side glass according to claim 13, wherein a water-repellent treatment is applied to a surface of the glass plate facing the interior side in an area where the anti-fogging film is not present, the area being at least one of the rear side end portion of the glass plate and the upper end portion of the glass plate.

15. a region where the anti-fogging film is absent is provided at the rear side edge of the glass plate; The vehicle side glass according to any one of claims 1 to 14, wherein the rear side edge of the glass plate and the rear side edge of the anti-fogging film are approximately parallel to each other.

16. the upper end of the glass plate has an area where the anti-fogging film is not present; The vehicle side glass according to any one of claims 1 to 15, wherein the upper edge of the glass plate and the upper edge of the anti-fogging film are approximately parallel to each other.

17. The vehicle side glass according to any one of claims 1 to 16, wherein the anti-fogging film has a shape with chamfered corners.

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