Ultraviolet-blocking glass

Abstract

To provide an ultraviolet shielding glass excellent in ultraviolet shielding property and external appearance.SOLUTION: An ultraviolet shielding glass comprises a glass plate, and an ultraviolet shielding film disposed on a principal surface of the glass plate. The ultraviolet shielding glass is such that: the ultraviolet shielding film is a continuous film having no sudden change portion in the film thickness; the ultraviolet shielding film has in a plan view, a peripheral region as a region of a width of 1 mm to the inside from an outer peripheral edge of the ultraviolet shielding film, an intermediate region as a region of a width of 59 mm to the inside from an inner peripheral edge of the peripheral region, and a center region surrounded by the intermediate region; a cross-sectional shape of the ultraviolet shielding film in the peripheral region has an upward projecting curve; a cross-sectional shape of the ultraviolet shielding film in the intermediate region has an upward projecting curve; a maximum film thickness of the ultraviolet shielding film in the center region is 1 μm-10 μm; and when the ultraviolet shielding glass is mounted on a vehicle body opening, the peripheral region includes a peripheral region part along an upper side of the ultraviolet shielding glass, and in the peripheral region part, a maximum film thickness of the ultraviolet shielding film is 0.4 μm-1.0 μm.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to ultraviolet-shielding glass.

Background Art

[0002] Ultraviolet-shielding glass having an ultraviolet-shielding film provided on the surface of a glass plate is known. Further, when a coated glass is used as a window glass that can be opened and closed, a coated glass (Patent Document 1) has been proposed in which a coating film is provided with a predetermined width from the end of the window glass and the film thickness of the coating film is 1 μm or more. Furthermore, a coated glass (Patent Document 2) has been proposed in which the angle formed by the glass plate and the coating film is within a predetermined range.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] When an ultraviolet-shielding film having a film thickness of 1 μm or more is provided with a predetermined width from the end of a window glass as in Patent Document 1, the outer peripheral edge of the ultraviolet-shielding film is likely to be conspicuous visually. In order to improve the conspicuousness of the outer peripheral edge of the ultraviolet-shielding film visually, when a film thickness gradual change portion is provided at the end of the ultraviolet-shielding film and the angle formed by the glass plate and the coating film is within a predetermined range as in Patent Document 2, the present inventors have found that distortion is likely to occur visually in the vicinity of the outer periphery of the ultraviolet-shielding film. Therefore, an object of the present invention is to provide an ultraviolet-shielding glass excellent in ultraviolet-shielding property and appearance.

Means for Solving the Problems

[0005] The inventors have found that the distortion generated near the outer periphery of the ultraviolet shielding film is caused by the cross-sectional structure of the end portion of the ultraviolet shielding film, and have completed the present invention.

[0006] That is, they have found that the above problems can be solved by the following configuration. An ultraviolet shielding glass comprising a glass plate and an ultraviolet shielding film provided on a main surface of the glass plate, wherein the ultraviolet shielding film is a continuous film having no abrupt change in its film thickness, in plan view, the ultraviolet shielding film has a peripheral region which is a region with a width of 1 mm from the outer peripheral edge of the ultraviolet shielding film inward, an intermediate region which is a region with a width of 59 mm from the inner peripheral edge of the peripheral region inward, and a central region surrounded by the intermediate region, the cross-sectional shape of the ultraviolet shielding film in the peripheral region has an upwardly convex curve, the cross-sectional shape of the ultraviolet shielding film in the intermediate region has an upwardly convex curve, the maximum film thickness of the ultraviolet shielding film in the central region is 1 μm to 10 μm, when the ultraviolet shielding glass is attached to a vehicle body opening, the peripheral region includes a peripheral region portion along the upper side of the ultraviolet shielding glass, and in the peripheral region portion, the maximum film thickness of the ultraviolet shielding film is 0.4 μm to 1.0 μm.

Advantages of the Invention

[0007] According to the present invention, it is possible to provide an ultraviolet shielding glass excellent in ultraviolet shielding property and appearance.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0009] The present invention will be described in detail below. The description of the constituent elements described below in this specification may be made based on typical embodiments of the present invention, but the present invention is not limited to such embodiments. Also, the dimensional ratios in FIGS. 1 to 3 are different from the actual ones for convenience of explanation. The present invention will be described in detail below.

[0010] (Ultraviolet ray shielding glass) The ultraviolet ray shielding glass of the present invention is an ultraviolet ray shielding glass that includes a glass plate and an ultraviolet ray shielding film provided on its main surface, and is attached to a vehicle body opening so as to be openable and closable. The ultraviolet ray shielding film included in the ultraviolet ray shielding glass of the present invention is a continuous film without a sudden change in its film thickness, and is provided on substantially the entire surface of one of the two main surfaces of the glass plate (the surface that becomes the inside of the vehicle when attached to the vehicle body opening). In the present invention, the ultraviolet ray shielding film shall have a peripheral region that is a region with a width of 1 mm from the outer peripheral edge of the ultraviolet ray shielding film inward in plan view, an intermediate region that is a region with a width of 59 mm from the inner peripheral edge of the peripheral region inward, and a central region surrounded by the intermediate region. In the ultraviolet ray shielding glass of the present invention, the maximum film thickness of the ultraviolet ray shielding film in the central region is 1 μm to 10 μm.

[0011] Also, when the ultraviolet ray-shielding glass of the present invention is attached to a vehicle body opening, the periphery of the ultraviolet ray-shielding glass is present within a glass storage portion around the vehicle body opening. Therefore, when the ultraviolet ray-shielding film exists up to the periphery of the glass plate, the periphery of the ultraviolet ray-shielding film at that portion is present within the glass storage portion. When the ultraviolet ray-shielding film is separated from the periphery of the glass plate by a distance exceeding the depth of the glass storage portion, a portion where no ultraviolet ray-shielding film exists is generated between the periphery of the ultraviolet ray-shielding film of the ultraviolet ray-shielding glass attached to the vehicle body opening and the periphery of the vehicle body opening. The ultraviolet ray-shielding glass of the present invention, when it is attached to a vehicle body opening, has an ultraviolet ray-shielding film present on 70% or more of the surface of the vehicle body opening. The ratio of the ultraviolet ray-shielding film present in the vehicle body opening to the surface of the vehicle body opening is preferably 80% or more, more preferably 90% or more, and may be 100%. Due to the large area, the function as an ultraviolet ray-shielding glass is fully exhibited.

[0012] In addition, in the ultraviolet ray-shielding glass of the present invention, when the ultraviolet ray-shielding glass is attached to a vehicle body opening, at least a part of the peripheral region of the ultraviolet ray-shielding film is present in the vehicle body opening. That is, when the ultraviolet ray-shielding glass is attached to a vehicle body opening, in at least a part of the periphery of the ultraviolet ray-shielding glass, the ultraviolet ray-shielding film is separated from the glass storage portion around the vehicle body opening, or the width of the peripheral region is less than 1 mm compared to 1 mm and is present within the glass storage portion. In the present invention, the maximum film thickness of the peripheral region separated from the glass storage portion and the peripheral region present within the glass storage portion with a width of less than 1 mm is 0.4 μm to 1.0 μm. As the peripheral region existing in the vehicle body opening or the peripheral region existing in the glass storage part with a width of less than 1 mm, it is preferably a peripheral region along the peripheral edge of the ultraviolet shielding glass that moves away from the glass storage part when the ultraviolet shielding glass attached to the vehicle body opening so as to be openable and closable is opened. For example, a substantially quadrilateral ultraviolet shielding glass is attached to the vehicle body opening so as to be openable and closable in the vertical direction. When it is opened, usually, the upper side of the ultraviolet shielding glass moves downward away from the glass storage part, and the both side edges and the lower side are inside the glass storage part and move downward. In such an ultraviolet shielding glass, it is preferable that at least a part of the peripheral region of the ultraviolet shielding film along the upper side exists in the vehicle body opening. In addition, the peripheral region along at least a part of the both side edges and the lower side may also exist in the vehicle body opening in the same manner as the upper side.

[0013] The approximate shape of the plate glass in the ultraviolet shielding glass of the present invention is preferably a quadrilateral, but is not limited thereto, and may be a shape such as a triangle, a pentagon, etc. Also, all the sides may be straight, but a part of the sides may be curved, or the sides may be uneven. Hereinafter, the present invention will be described by taking an example of an ultraviolet shielding glass that is opened and closed in the vertical direction using a plate glass having a substantially quadrilateral shape, an upper side that is a convex curve upward, and a convex part for attachment to the vehicle body opening or the like on the lower side.

[0014] FIG. 1 is a plan view showing an example of the ultraviolet shielding glass 10 of the present invention. The ultraviolet shielding glass 10 attached to the vehicle body opening so as to be openable and closable in the vertical direction has a glass plate 11 and an ultraviolet shielding film 12 provided on the main surface of the glass plate 11. The glass plate 11 has an outer periphery composed of four sides: an upper side 31, a lower side 32, a front side 33, and a rear side 34.

[0015] FIG. 2 is a plan view schematically showing an example of the ultraviolet ray shielding film 12 in the ultraviolet ray shielding glass of the present invention. The ultraviolet ray shielding film 12 is a continuous film without a sudden change in its film thickness, and has a peripheral region 21, an intermediate region 22, and a central region 23. The peripheral region 21 is a region with a width of 1 mm from the outer peripheral edge of the ultraviolet ray shielding film 12 inward in a plan view. In the present invention, the inner side in the glass plate means the direction of the center of gravity in the plane of the glass plate. The intermediate region 22 is a region with a width of 59 mm from the inner peripheral edge of the peripheral region 21 inward. The central region 23 is a region surrounded by the intermediate region 22. The maximum film thickness of the ultraviolet ray shielding film 12 in the central region 23 is 1 μm to 10 μm.

[0016] The ultraviolet ray shielding film 12 in the ultraviolet ray shielding glass 10 shown in FIG. 1 is provided along the upper side 31 of the glass plate 11, at a certain width below the upper side 31, and there is a film-free portion with a certain width along the upper side 31. The width of the film-free portion is preferably 5 mm to 25 mm. Since the width of the peripheral region 21 of the ultraviolet ray shielding film 12 is 1 mm, when the ultraviolet ray shielding glass 10 is attached to the vehicle body opening, if the width of the film-free portion exceeds the depth of the glass storage portion minus 1 mm, at least a part of the width direction of the peripheral region 21 along the upper side 31 exists in the vehicle body opening. When the width of the film-free portion exceeds the depth of the glass storage portion minus 1 mm and is less than the depth of the glass storage portion, a part of the width direction of the peripheral region 21 along the upper side 31 exists in the glass storage portion, but due to its narrow width, the smooth movement of the ultraviolet ray shielding glass 10 can be maintained.

[0017] FIG. 3 is a partial end view of the cross-section taken along the line A-A' of FIG. 1 cutting across the upper side 31. The ultraviolet ray shielding film 12 directly provided on the main surface of the glass plate 11 has a peripheral region 21, an intermediate region 22, and a central region 23. At least a part of the width direction of the peripheral region 21 shown in the figure along the upper side 31 exists in the vehicle body opening when the ultraviolet ray shielding glass 10 is attached to the vehicle body opening.

[0018] In the ultraviolet ray shielding glass 10 shown in FIGS. 1 to 3, when the ultraviolet ray shielding glass 10 is attached to the vehicle body opening, at least a part of the peripheral region 21 along the upper side 31 exists in the vehicle body opening, and in the peripheral region 21 existing in the vehicle body opening, the maximum film thickness (L) of the ultraviolet ray shielding film 12 is 0.4 μm to 1.0 μm.

[0019] As shown in FIG. 1, the ultraviolet ray shielding film 12 is provided in proximity along the front side 33 and the rear side 34, and there is substantially no film absence portion along those sides. Therefore, when attached to the vehicle body opening, usually, the peripheral region 21 along the front side 33 and the rear side 34 always exists in the glass storage portion around the vehicle body opening regardless of the opening and closing of the ultraviolet ray shielding glass 10. Also, in the lower side 32, except for the portion protruding downward, the ultraviolet ray shielding film 12 is provided in proximity along the lower side 32, and there is substantially no film absence portion along the lower side 32. Therefore, similar to the case of the side, usually, the peripheral region 21 along the lower side 32 always exists in the glass storage portion around the vehicle body opening regardless of the opening and closing of the ultraviolet ray shielding glass 10. However, the ultraviolet ray shielding glass of the present invention is not limited to that shown in the figure. For example, a film absence portion similar to the film absence portion along the upper side 31 may be provided along at least one side selected from the front side 33, the rear side 34, and the lower side 32. When a film absence portion is provided, it is preferable that at least a part of the peripheral region along the side where the film absence portion is provided exists in the vehicle body opening when the ultraviolet ray shielding glass is attached to the vehicle body opening. Furthermore, when the ultraviolet ray shielding glass attached to the vehicle body opening is opened, if at least a part of the front side 33 or the rear side 34 together with the upper side 31 moves away from the glass storage portion (for example, when the ultraviolet ray shielding glass has a structure that moves obliquely downward and opens), in addition to the upper side, a film absence portion is provided along the side that moves away from the glass storage portion, and in addition to the peripheral region along the upper side, it is also preferable that at least a part of the peripheral region along that side also exists in the vehicle body opening.

[0020] (Glass plate) The glass plate 11 includes soda-lime glass, aluminosilicate glass, and alkali-free glass, and soda-lime glass is preferably used. The thickness of the glass plate 11 is preferably 0.5 mm to 5.0 mm, more preferably 1.5 mm to 4.5 mm, and particularly preferably 2.0 to 4.0 mm. Further, the glass plate may have an intermediate layer such as a black ceramics layer between the glass plate and the ultraviolet shielding film on a part of the main surface on which the ultraviolet shielding film is formed.

[0021] (Ultraviolet shielding film) As shown in FIG. 2, the ultraviolet shielding film 12 has, in plan view, a peripheral region 21 which is a region with a width of 1 mm from the outer peripheral edge of the ultraviolet shielding film 12 inward, an intermediate region 22 which is a region with a width of 59 mm from the inner peripheral edge of the peripheral region 21 inward, and a central region 23 surrounded by the intermediate region 22. The ultraviolet shielding film is a continuous film without a sudden change in its film thickness, and the film thicknesses of two adjacent regions at the boundary between the peripheral region 21 and the intermediate region 22 and at the boundary between the intermediate region 22 and the central region 23 are the same. However, the film thickness at these boundaries may vary in the length direction of the boundary. Also, as described later, the cross-sectional shape of the ultraviolet shielding film 12 in the peripheral region 21 preferably has an upwardly convex curve, and the cross-sectional shape of the ultraviolet shielding film 12 in the intermediate region 22 also preferably has an upwardly convex curve. The film thickness of the central region 23 is preferably constant, but some film thickness variation may be allowed.

[0022] The maximum film thickness of the ultraviolet shielding film 12 in the central region 23 is 1 μm to 10 μm. When the maximum film thickness of the ultraviolet shielding film 12 in the central region 23 is within this range, the ultraviolet shielding glass 10 can ensure excellent ultraviolet shielding properties and abrasion resistance. The maximum film thickness of the ultraviolet shielding film 12 in the central region 23 is preferably 1.5 μm to 6 μm, more preferably 2 μm to 5 μm, and particularly preferably 2 μm to 4 μm. The minimum film thickness of the ultraviolet shielding film 12 in the central region 23 is preferably 0.8 μm, more preferably 1 μm.

[0023] At least a part of the peripheral region 21 of the ultraviolet ray shielding film 12 (the peripheral region portion along the upper side 31 in FIG. 1 or a part thereof) is present in the vehicle body opening when the ultraviolet ray shielding glass 10 is attached to the vehicle body opening. In the peripheral region 21 present in the vehicle body opening, the maximum film thickness of the ultraviolet ray shielding film 12 is 0.4 μm to 1.0 μm. When the maximum film thickness of the ultraviolet ray shielding film 12 in the peripheral region 21 present in the vehicle body opening is 0.4 μm to 1.0 μm, it is possible to suppress the occurrence of strain in the vicinity of the outer periphery of the ultraviolet ray shielding glass 10. Although the details are not clear, the inventors consider that when the maximum film thickness of the ultraviolet ray shielding film 12 in the peripheral region 21 is 0.4 μm or more, leveling during the formation of the ultraviolet ray shielding film in the intermediate region 22 is likely to occur, the smoothness of the intermediate region 22 is enhanced, and the occurrence of strain is suppressed. When the maximum film thickness of the ultraviolet ray shielding film 12 in the peripheral region 21 is 1.0 μm or less, the outer periphery of the ultraviolet ray shielding film 12 is less likely to be visually conspicuous. In the peripheral region 21 present in the vehicle body opening, the maximum film thickness of the ultraviolet ray shielding film 12 is preferably 0.4 μm to 0.9 μm, more preferably 0.4 μm to 0.8 μm, and particularly preferably 0.4 μm to 0.7 μm.

[0024] The peripheral region 21 that is present in the vehicle body opening when attached to the vehicle body opening is preferably the peripheral region 21 that exists along at least a part of one or more sides selected from the upper side 31, the front side 33, and the rear side 34 of the glass plate 11. When the peripheral region 21 of the ultraviolet ray shielding film 12 that is present in the vehicle body opening exists along at least a part of one or more sides selected from the upper side 31, the front side 33, and the rear side 34 of the glass plate 11, the appearance of the ultraviolet ray shielding glass 10 can always be excellent.

[0025] When the cross-sectional shape of the ultraviolet shielding film 12 in the peripheral region 21 is viewed with the substrate 11 on the lower side and the ultraviolet shielding film 12 on the upper side, it preferably has a curve convex upward. When the cross-sectional shape of the ultraviolet shielding film 12 in the peripheral region 21 has a curve convex upward, the maximum film thickness in the peripheral region 21 becomes 0.4 μm or more, and the occurrence of strain in the vicinity of the outer periphery of the ultraviolet shielding film 12 can be suppressed. In the convex curve, the inclination of the straight line connecting the outer peripheral edge of the ultraviolet shielding film and the upper surface of the film at a position 0.1 mm inward from the outer peripheral edge is preferably 6 μm / mm or less. When this inclination is 6 μm / mm or less, the outer periphery of the ultraviolet shielding film 12 becomes less conspicuous. This inclination is more preferably 4 μm / mm or less, and particularly preferably 3 μm / mm or less.

[0026] The film thickness on the intermediate region side at the boundary between the peripheral region 21 and the intermediate region 22 is the same as the film thickness on the peripheral region side. Since the film thickness on the peripheral region side at this boundary is usually within the range of the maximum film thickness of the peripheral region, it is preferable that the film thickness on the intermediate region side at this boundary is also within the range of the maximum film thickness of the peripheral region. The average film thickness of the ultraviolet shielding film 12 in the intermediate region 22 is preferably 1 μm to 3 μm. In the present invention, the average film thickness is the average value of the film thicknesses at five randomly selected locations. When the average film thickness of the ultraviolet shielding film 12 in the intermediate region 22 is 1 μm to 3 μm, leveling during the formation of the ultraviolet shielding film in the intermediate region 22 is likely to occur, and the occurrence of strain in the vicinity of the outer periphery of the ultraviolet shielding film 12 can be suppressed. The average film thickness of the ultraviolet shielding film 12 in the intermediate region 22 is more preferably 1 μm to 2 μm.

[0027] When the cross-sectional shape of the ultraviolet shielding film 12 in the intermediate region 22 is viewed with the substrate 11 on the lower side and the ultraviolet shielding film 12 on the upper side, it preferably has an upwardly convex curve. When the cross-sectional shape of the ultraviolet shielding film 12 in the intermediate region 22 has an upwardly convex curve, leveling during the formation of the ultraviolet shielding film in the intermediate region 22 is likely to occur, the smoothness of the intermediate region 22 is enhanced, and the occurrence of distortion in the vicinity of the outer periphery of the ultraviolet shielding film 12 can be suppressed. The slope of the tangent line in contact with the convex curve is preferably 2 μm / mm or less. When the slope of the tangent line in contact with the convex curve is 2 μm / mm or less, leveling during the formation of the ultraviolet shielding film in the intermediate region 22 is likely to occur, and the occurrence of distortion in the vicinity of the outer periphery of the ultraviolet shielding film 12 can be suppressed. The slope of the tangent line in contact with the convex curve is more preferably 1 μm / mm or less, and particularly preferably 0.5 μm / mm or less.

[0028] The maximum film thickness of the ultraviolet shielding film in the central region 22 is 1 μm to 10 μm. Also, the film thickness on the central region side at the boundary between the intermediate region 22 and the central region 23 is the same as the film thickness on the intermediate region side. The film thickness of the ultraviolet shielding film 12 at the outer peripheral edge of the central region 23, which is this boundary line, is preferably 1 μm to 3 μm. Except for the vicinity of this boundary line, the film thickness of the central region 22 may exceed 3 μm. When the maximum film thickness of the ultraviolet shielding film 12 in the central region 23 is 1 μm to 10 μm, since the central region 23 is the main region of the ultraviolet shielding film 12, the ultraviolet shielding glass 10 can ensure excellent ultraviolet shielding properties.

[0029] The ultraviolet shielding film 12 is preferably provided directly on the main surface of the glass plate 11. By providing the ultraviolet shielding film 12 directly on the main surface of the glass plate 11, excellent adhesion to the glass can be ensured.

[0030] In the central region 22, the ultraviolet light transmittance of the ultraviolet light shielding film 12 is preferably 0% to 15%, more preferably 0% to 10%, still more preferably 0% to 5%, and particularly preferably 0 to 1%. In the present invention, the ultraviolet light transmittance refers to a value measured in accordance with ISO13837:2008A.

[0031] (Composition for forming the ultraviolet light shielding film 12) The ultraviolet light shielding film 12 in the peripheral region 21 present in the vehicle body opening can be obtained by appropriately designing the surface tension of the liquid composition for forming the ultraviolet light shielding film 12, the contact angle of the composition with respect to the glass plate 11, and the viscosity of the composition. The liquid composition with the surface tension, contact angle, and viscosity adjusted is also used for forming the ultraviolet light shielding film 12 other than the peripheral region 21 present in the vehicle body opening. That is, usually, the entire ultraviolet light shielding film 12 is formed using this liquid composition.

[0032] The surface tension of the composition for forming the ultraviolet light shielding film 12 is preferably 22 mN / m to 30 mN / m. In the present invention, the surface tension of the composition refers to a value measured at 20°C for a composition having a solid content concentration of 30% by mass. When the surface tension of the composition is 22 mN / m or more, the maximum film thickness in the peripheral region 21 of the ultraviolet light shielding film 12 can be made 0.4 μm or more. When the surface tension of the composition is 30 mN / m or less, the maximum film thickness in the peripheral region 21 of the ultraviolet light shielding film 12 can be made 1.0 μm or less. The surface tension of the composition can be designed by the material constituting the ultraviolet light shielding film 12, the surface conditioner, the solvent, the concentration, etc. The surface tension of the composition is more preferably 23 mN / m to 28 mN / m, and particularly preferably 24 mN / m to 27 mN / m.

[0033] The contact angle of the composition for forming the ultraviolet ray shielding film 12 with respect to the glass plate 11 is preferably 18° to 35°. In the present invention, the contact angle of the composition refers to the value measured at 20°C for a composition having a solid content concentration of 30% by mass. When the contact angle of the composition with respect to the glass plate 11 is 18° or more, the maximum film thickness in the peripheral region 21 of the ultraviolet ray shielding film 12 can be made 0.4 μm or more. When the contact angle of the composition with respect to the glass plate 11 is 35° or less, the maximum film thickness in the peripheral region 21 of the ultraviolet ray shielding film 12 can be made 1.0 μm or less. The contact angle of the composition with respect to the glass plate 11 can be designed by cleaning of the glass, materials contained in the composition, surface conditioner, solvent, concentration, etc. The contact angle of the composition with respect to the glass plate 11 is more preferably 20° to 30°, and particularly preferably 21° to 27°.

[0034] The viscosity of the composition for forming the ultraviolet ray shielding film 12 is preferably 0.5 mPa·s to 5 mPa·s. In the present invention, the viscosity of the composition refers to the value measured at 25°C using an E-type viscometer (RE-85, manufactured by Toki Sangyo Co., Ltd.) for a composition having a solid content concentration of 30% by mass. When the viscosity of the composition is 0.5 mPa·s or more, the yield value of the composition can be controlled within an appropriate range, and the maximum film thickness in the peripheral region 21 of the ultraviolet ray shielding film 12 can be made 0.4 μm or more. When the viscosity of the composition is 5 mPa·s or less, the yield value of the composition can be controlled within an appropriate range, and the maximum film thickness in the peripheral region 21 of the ultraviolet ray shielding film 12 can be made 1.0 μm or less. The viscosity of the composition can be designed by the materials constituting the ultraviolet ray shielding film 12, surface conditioner, solvent, concentration, etc. The viscosity of the composition is more preferably 1 mPa·s to 3 mPa·s, and particularly preferably 1.4 mPa·s to 2.5 mPa·s.

[0035] The composition for forming the ultraviolet shielding film 12 preferably contains an ultraviolet absorber and a curable silane. The curable silane refers to a silicon compound having at least one hydroxyl group or hydrolyzable group bonded to a silicon atom and having one or more such silicon atoms. The hydrolyzable group is a group that can be hydrolyzed to become a hydroxyl group, and examples thereof include an alkoxy group, a chlorine atom, an acyl group, and an acyloxy group. As the curable silane, an alkoxysilane having at least two alkoxy groups bonded to a silicon atom is preferable, and as the alkoxy group, an alkoxy group having 1 to 4 carbon atoms is preferable.

[0036] Examples of the ultraviolet absorber include a triazine-based ultraviolet absorber, a benzotriazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, an azomethine-based ultraviolet absorber, an indole-based ultraviolet absorber, a benzodithiol-based ultraviolet absorber, and an oxazolone-based ultraviolet absorber. In particular, the ultraviolet absorber is preferably one or more selected from an azomethine-based ultraviolet absorber, an indole-based ultraviolet absorber, and a benzodithiol-based ultraviolet absorber. When the ultraviolet absorber is one or more selected from an azomethine-based ultraviolet absorber, an indole-based ultraviolet absorber, and a benzodithiol-based ultraviolet absorber, ultraviolet rays of 380 nm to 400 nm can be efficiently shielded, and the ultraviolet transmittance of the ultraviolet shielding film 12, measured in accordance with ISO13837:2008A, can be 0% to 5% when the film thickness is 1.5 μm.

[0037] As the curable silane, tetraalkoxysilane and bisalkoxysilane are preferable. Examples of the tetraalkoxysilane include tetraethoxysilane and tetramethoxysilane. The bisalkoxysilane is preferably a compound represented by the following formula (1). R 1 n X 1 3-n Si-Q-SiR 2 m X 2 3-m (1) R 1 and R 2is each independently a monovalent hydrocarbon group having 1 to 3 carbon atoms, and X 1 and X 2 are each independently an alkoxy group, Q is a linear or branched divalent hydrocarbon group having 3 to 8 carbon atoms, and n and m are each independently 0, 1, or 2.

[0038] When the composition for forming the ultraviolet shielding film 12 contains an ultraviolet absorber and a silane, the ultraviolet absorber is one or more selected from azomethine-based ultraviolet absorbers, indole-based ultraviolet absorbers, and benzodithiol-based ultraviolet absorbers, and the silane is tetraalkoxysilane and bisalkoxysilane represented by the formula (1), it becomes easy to make the surface tension of the composition for forming the ultraviolet shielding film 12 22 mN / m to 30 mN / m, and it is possible to suppress the occurrence of strain in the vicinity of the outer periphery of the ultraviolet shielding film 12.

[0039] The composition for forming the ultraviolet shielding film 12 preferably contains both tetraalkoxysilane and bisalkoxysilane represented by the formula (1) as curable silanes. In this case, the ratio of the bisalkoxysilane represented by the formula (1) to tetraalkoxysilane is preferably 0.05 to 0.2 by mass ratio. When the ratio of the bisalkoxysilane represented by the formula (1) to tetraalkoxysilane is 0.05 or more, elution of the ultraviolet shielding film 12 when immersed in an alkaline solution can be suppressed. When the ratio of the bisalkoxysilane represented by the formula (1) to tetraalkoxysilane is 0.2 or less, the hardness of the ultraviolet shielding film 12 increases, and the ultraviolet shielding glass 10 is excellent in abrasion resistance and scratch resistance. The ratio of the bisalkoxysilane represented by the formula (1) to tetraalkoxysilane is more preferably 0.05 to 0.15, and particularly preferably 0.06 to 0.13.

[0040] When tetraalkoxysilane and bisalkoxysilane represented by the formula (1) are used in combination as the hardening silane, the ratio of the bisalkoxysilane represented by the formula (1) to the ultraviolet absorber is preferably 0.5 to 2 in terms of mass ratio. When the ratio of the bisalkoxysilane represented by the formula (1) to the ultraviolet absorber is 0.5 or more, an ultraviolet shielding film 12 in which the ultraviolet absorber is uniformly dispersed can be obtained. When the ratio of the bisalkoxysilane represented by the formula (1) to the ultraviolet absorber is 2 or less, the hardness of the ultraviolet shielding film 12 is increased, and the ultraviolet shielding glass 10 is excellent in weather resistance and scratch resistance. The ratio of the bisalkoxysilane represented by the formula (1) to the ultraviolet absorber is more preferably 0.6 to 1.7, and particularly preferably 0.7 to 1.5.

[0041] The composition for forming the ultraviolet shielding film 12 preferably further contains an infrared absorber, a resin, a surface conditioner, a chelating agent, an acid, and a solvent.

[0042] (Method for manufacturing the ultraviolet shielding glass 10) The ultraviolet shielding film 12 is preferably formed on the surface of the glass plate 11 by applying the obtained composition, drying it, and hardening it. Examples of the method for applying the composition include a flow coating method, a dip coating method, a spin coating method, a spray coating method, a flexographic printing method, a screen printing method, a gravure printing method, a roll coating method, a meniscus coating method, and a die coating method.

[0043] Examples of the method for drying the composition include a heat treatment and a reduced pressure drying treatment. When the drying method of the composition is a heat treatment, it is preferably dried at 20°C to 100°C for 3 seconds to 60 seconds. Under these drying conditions, it becomes easy to obtain an ultraviolet shielding film 12 having a maximum film thickness of 0.4 μm to 1.0 μm in at least a part of the peripheral region 21 of the ultraviolet shielding film 12.

[0044] Examples of the method for hardening the composition include a heat treatment and a reduced pressure drying treatment. When the hardening method of the composition is a heat treatment, it is preferably hardened at 60°C to 230°C for 2 minutes to 20 minutes.

[0045] The components and manufacturing method of the ultraviolet ray shielding glass 10 according to one embodiment of the present invention have been described above. These are merely examples, and it is obvious to those skilled in the art that the ultraviolet ray shielding glass 10 of the present invention may have other embodiments.

Example

[0046] Hereinafter, the present invention will be described in detail by way of examples, but the present invention is not limited thereto. Examples 1 to 5 are examples, and Examples 6 to 8 are comparative examples.

[0047] (Example 1) Into a round-bottom flask, 2.09 g of a benzophenone-based ultraviolet absorber (Uvinul 3050, manufactured by BASF), 5.24 g of an epoxy silane (KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.), 4.25 g of butyl acetate, and 0.03 g of benzyltriethylammonium chloride were added, heated to 105 ° C, and stirred for 4 hours to obtain a preparation liquid A. To the obtained preparation liquid A, 39.44 g of methyl ethyl ketone, 8.87 g of methanol, 13.80 g of pure water, 10.80 g of tetraethoxysilane, 0.86 g of bisalkoxysilane (KBM3066, manufactured by Shin-Etsu Chemical Co., Ltd.), 9.52 g of acetic acid aqueous solution (90% by mass), 0.95 g of an epoxy resin (SR-SEP, manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.), 0.17 g of an aqueous solution of polymaleic acid (Non-Pole PMA-50W, manufactured by NOF Corporation), 0.01 g of maleic acid, and 0.06 g of a surface conditioner (BYK377, manufactured by BYK-Chemie GmbH) were added, and stirred at 50 ° C for 2 hours. Finally, 3.87 g of an ITO dispersion liquid (ITO dispersion liquid with a concentration of 30% by mass, manufactured by Mitsubishi Materials Corporation) was added to obtain Composition 1 with a solid content concentration of 12.5%. Composition 1 was applied to the concave surface of a glass plate by pouring a coating liquid along the upper side of the glass plate with a few mm to several tens of mm opened from the upper end of the glass plate in a state where the glass plate was erected vertically, and heated at 200 ° C for 20 minutes in an air atmosphere to obtain an ultraviolet ray shielding glass 1 having an ultraviolet ray shielding film. The glass plate used was a glass plate (high heat ray absorption green glass, manufactured by AGC Inc.) with a size of 670 mm (length) × 910 mm (width) × 3.1 mm (thickness).

[0048] (Examples 2 to 8) Instead of the blending liquid A described in Example 1, blending liquids B to D were blended. Table 1 shows the compositions of blending liquids B to D (the unit of numerical values is g) together with blending liquid A. The ultraviolet absorbers used in blending liquids B to D are as follows. Benzodithiol-based ultraviolet absorber: 1,2-dibutyl-4-(4,7-dihydroxy-1,3-benzodithiol-2-ylidene)pyrazolidine-3,5-dione Azomethine-based ultraviolet absorber: manufactured by Orient Chemical Industries, Ltd., BONASORB UA-3701 Indole-based ultraviolet absorber: manufactured by Orient Chemical Industries, Ltd., BONASORB UA-3911 [Table 1]

[0049] Using blending liquids A to D, compositions 2 to 8 were produced in the same manner as composition 1 in Example 1. Table 2 shows the compositions of compositions 2 to 8 (the unit of numerical values is g) together with composition 1. The surface modifiers used in compositions 2 to 8 are as follows. BYK307: manufactured by BYK-Chemie Japan, BYK-307 DN900: manufactured by Kusumoto Chemicals, Ltd., Disparon DN-900 BYK302: manufactured by BYK-Chemie Japan, BYK-302 BYK348: manufactured by BYK-Chemie Japan, BYK-348 BYK381: manufactured by BYK-Chemie Japan, BYK-381 [Table 2]

[0050] The surface tension, contact angle with respect to the glass plate, and viscosity of the obtained compositions 1 to 8 were as shown in Table 3. The surface tension, contact angle with respect to the glass plate, and viscosity were measured using a composition with a solid content concentration of 30% by mass. [Table 3]

[0051] Using the compositions 2 to 8 shown in Table 2, ultraviolet-shielding glasses 2 to 8 were obtained in the same manner as in Example 1, except that the tilting angle of the glass plate was changed. The evaluation results of the obtained ultraviolet-shielding glasses 1 to 8 are shown in Table 4. Note that the tilting angle of the glass plate was expressed as 0° when the coating surface faced upward and was placed horizontally, 90° when the glass was placed vertically, and 180° when the coating surface faced downward and was placed horizontally. The inclination in the peripheral region refers to the inclination of a straight line connecting the outer peripheral edge of the ultraviolet-shielding film and the upper surface of the film at a position 0.1 mm inward from the outer peripheral edge.

[0052] (Film thickness in each region) Using a stylus surface profiler (Dektak150, manufactured by ULVAC), the film thickness (μm) of the ultraviolet-shielding film in each region on the upper end side of the ultraviolet-shielding glass was measured. (Evaluation of visibility of the outer periphery) By visual observation, those with a clearly visible outer periphery were marked as ×, and the others were marked as ○.

[0053] (Evaluation of distortion near the outer periphery) When the surface of the obtained ultraviolet-shielding glass was irradiated with light from a projector (EB-1776W, manufactured by EPSON) from a position 7 m away, those with distortion visible near the outer periphery of the ultraviolet-shielding film were marked as ×, and the others were marked as ○. However, when the evaluation of distortion near the outer periphery could not be determined visually, a stylus surface profiler (Dektak150, manufactured by ULVAC) was used to measure the peripheral region and the intermediate region, and those with unevenness having a maximum cross-sectional height of 100 nm or more were marked as ×, and the others were marked as ○.

Table 4

Industrial Applicability

[0054] The ultraviolet-shielding glass of the present invention is an ultraviolet-shielding glass excellent in ultraviolet-shielding properties and appearance, and thus is applied to vehicles such as automobiles and railways, and particularly preferably applied to automobiles. The entire contents of the specification, claims, abstract, and drawings of Japanese Patent Application No. 2019-000196 filed on January 4, 2019 are hereby incorporated by reference herein as the disclosure of the specification of the present invention.

Explanation of Reference Signs

[0055] 10: Ultraviolet ray shielding glass 11: Glass plate 12: Ultraviolet ray shielding film 21: Peripheral region 22: Intermediate region 23: Central region 31: Upper side 32: Lower side 33: Front side 34: Rear side

Claims

1. An ultraviolet ray shielding glass comprising a glass plate and an ultraviolet ray shielding film provided on a main surface of the glass plate, and being attached to a vehicle body opening so as to be openable and closable, wherein the ultraviolet ray shielding film is a continuous film having no abrupt change in its film thickness, in a plan view, the ultraviolet ray shielding film has a peripheral region which is a region with a width of 1 mm from the outer peripheral edge of the ultraviolet ray shielding film inward, an intermediate region which is a region with a width of 59 mm from the inner peripheral edge of the peripheral region inward, and a central region surrounded by the intermediate region, the cross-sectional shape of the ultraviolet ray shielding film in the peripheral region has an upwardly convex curve, the cross-sectional shape of the ultraviolet ray shielding film in the intermediate region has an upwardly convex curve, the maximum film thickness of the ultraviolet ray shielding film in the central region is 1 μm to 10 μm, when the ultraviolet ray shielding glass is attached to a vehicle body opening, the peripheral region includes a peripheral region portion along the upper side of the ultraviolet ray shielding glass, and in the peripheral region portion, the maximum film thickness of the ultraviolet ray shielding film is 0.4 μm to 1.0 μm. Ultraviolet ray shielding glass.

2. When the ultraviolet ray shielding glass is attached to a vehicle body opening, the peripheral region is a peripheral region portion along a portion of the outer peripheral edge of the ultraviolet ray shielding glass that is away from the glass storage portion around the vehicle body opening when the ultraviolet ray shielding glass attached to the vehicle body opening is opened. The ultraviolet ray shielding glass according to claim 1.

3. The ultraviolet ray shielding glass is a substantially quadrilateral ultraviolet ray shielding glass attached to a vehicle body opening so as to move up and down to open and close, and the peripheral region portion is a peripheral region portion along the upper side of the ultraviolet ray shielding glass. The ultraviolet ray shielding glass according to claim 2.

4. The ultraviolet ray shielding glass according to claim 3, having a film-free region with a width of 5 mm to 25 mm between the outer peripheral edge of the peripheral region portion along the upper side of the ultraviolet ray shielding glass and the outer peripheral edge of the glass plate.

5. In the convex curve of the cross-sectional shape of the ultraviolet shielding film in the peripheral region, the slope of the straight line connecting the outer peripheral edge of the ultraviolet shielding film and the upper surface of the film at a position 0.1 mm inward from the outer peripheral edge is 6 μm / mm or less. The ultraviolet shielding glass according to any one of claims 1 to 4.

6. The average film thickness of the ultraviolet shielding film in the intermediate region is 1 μm to 3 μm. The ultraviolet shielding glass according to any one of claims 1 to 5.

7. The slope of the tangent line in contact with the curve of the cross-sectional shape of the ultraviolet shielding film in the intermediate region is 2 μm / mm or less. The ultraviolet shielding glass according to any one of claims 1 to 6.

8. The film thickness of the ultraviolet shielding film at the outer peripheral edge of the central region is 1 μm to 3 μm. The ultraviolet shielding glass according to any one of claims 1 to 7.

9. The ultraviolet shielding film is provided directly on the main surface of the glass plate. The ultraviolet shielding glass according to any one of claims 1 to 8.

10. The ultraviolet shielding film has an ultraviolet transmittance of 0 to 5% at a film thickness of 1.5 μm measured in accordance with ISO 13837:2008A. The ultraviolet shielding glass according to any one of claims 1 to 9.

11. The peripheral region and the intermediate region do not have irregularities with a maximum cross-sectional height of 100 nm or more measured using a stylus surface profiler. The ultraviolet shielding glass according to any one of claims 1 to 10.

12. The central region has an ultraviolet transmittance of 0% to 15% measured in accordance with ISO 13837:2008A. The ultraviolet shielding glass according to any one of claims 1 to 11.

13. When the ultraviolet ray shielding glass is attached to the vehicle body opening, the peripheral edge of the ultraviolet ray shielding glass is present in the glass storage portion around the vehicle body opening, and the outer peripheral edge of the ultraviolet ray shielding film is present in the glass storage portion. The ultraviolet ray shielding glass according to any one of claims 1 to 12.

14. When the ultraviolet ray shielding glass is attached to the vehicle body opening, the peripheral edge of the ultraviolet ray shielding glass is present in the glass storage portion around the vehicle body opening, and the outer peripheral edge of the ultraviolet ray shielding film is present at a position away from the glass storage portion. The ultraviolet ray shielding glass according to any one of claims 1 to 12.

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