JP2008290900A - Laminated glass for vehicle window - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide laminated glass for vehicle windows, which has a good appearance and blocks light in the ultraviolet region as well as visible light near the ultraviolet region. <P>SOLUTION: The laminated glass has an interlayer film having a transmittance T<SB>400</SB>of ≤15% and has optical characteristics wherein the transmittance T<SB>400</SB>is ≤10% and the visible light transmittance is ≥70%. In the laminated glass 1 for vehicle windows, the x-y chromaticity coordinates of the light from a standard light source C penetrating through the laminated glass is 0.305<x<0.334 and 0.326<y<0.373, or the yellow index YI is 5-8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a laminated glass used for a vehicle window.

  A window glass of a vehicle, particularly an automobile, has an ultraviolet shielding property for preventing sunburn of passengers and preventing deterioration of interior parts in the vehicle. Moreover, in order to suppress the temperature rise in the vehicle, the window glass of the automobile is provided with an infrared shielding performance as well as an ultraviolet shielding performance. For example, the laminated glass described in Patent Document 1 is composed of a glass plate having ultraviolet shielding performance and an interlayer film in which fine particles having infrared shielding performance are dispersed and blended, whereby both ultraviolet rays and infrared rays are formed. Improves shielding performance. Furthermore, for example, the laminated glass described in Patent Document 2 attempts to improve the shielding performance of both ultraviolet rays and infrared rays by containing a coloring component in the interlayer film and an ultraviolet absorber.

  Specifically, conventional window glass has been able to substantially shield light having a wavelength of 385 nm. However, in the conventional window glass, the transmittance of light with a wavelength of 390 nm is about 5%, the light with a wavelength of 395 nm is about 10%, and the light with a wavelength of 400 nm is about 20%.

International Publication No. 01/019748 Pamphlet JP 2007-55822 A (Claims) JP-A-6-145387 (Claims)

  The laminated glass described in Patent Documents 1 and 2 is effective in shielding light having a wavelength of about 385 nm as described above, but cannot sufficiently shield light having a wavelength longer than that. However, considering the global environment in recent years, as the amount of sunlight reaching the surface of the earth, especially the amount of light in the ultraviolet region increases, light with a wavelength near 400 nm, which is the visible light region, has a greater effect on the interior material of the vehicle. It is thought that energy is increasing.

  Therefore, for example, in order to shield light having a wavelength of around 400 nm, it is assumed that the transmittance is lowered by taking a measure for absorbing light of this wavelength in a glass plate or an intermediate film constituting the laminated glass. In that case, the transmittance of the short wavelength portion in the visible light region also decreases at the same time. In that case, the light near the vivid primary color, which is the complementary color, is emphasized by blocking the light in the wavelength range related to bluish purple, resulting in an appearance defect.

  That is, statistically, among automobiles sold, there are many automobiles that use calm black, white, and silver as the body color, rather than automobiles that use a vivid primary color such as red or yellow as the body color. If a vivid color window glass is used for the calm body color, only the window will stand out, leading to defects in the appearance.

  In order to eliminate such defects in appearance, it has been proposed to suppress the color tone in which yellow is emphasized by using a fluorescent whitening agent together with an ultraviolet absorber (for example, Patent Document 3). However, when a large amount of fluorescent whitening agent is used, the entire window glass has a glare sensation due to the light emission of the fluorescent whitening agent, leading to another problem in appearance.

  An object of the present invention is to provide a laminated glass for a vehicle window that enhances the shielding performance of high-energy ultraviolet rays and light in the visible region close to the ultraviolet region and has a good appearance.

The present invention is a laminated glass comprising a plurality of glass plates and an intermediate film containing an ultraviolet absorber, wherein the plurality of glass plates are laminated with an intermediate film interposed therebetween, wherein the intermediate film has a thickness of 400 nm. The transmittance T ₄₀₀ of light having a wavelength is 15% or less, the transmittance T _{400 of the} laminated glass is 10% or less, the visible light transmittance is 70% or more, and the transmitted light of the standard light source C is 0 in the xy chromaticity coordinates. Provided is a laminated glass for vehicle windows, characterized in that .305 <x <0.334 and 0.326 <y <0.373.

Further, the present invention is a laminated glass comprising a plurality of glass plates and an intermediate film containing an ultraviolet absorber, wherein the plurality of glass plates are laminated via an intermediate film, and the intermediate film has a thickness of 400 nm. The transmittance T ₄₀₀ of light having a wavelength of 15% or less, the transmittance T _{400 of the} laminated glass is 10% or less, the visible light transmittance is 70% or more, and the yellow index YI is 5 to 8. A laminated glass for vehicle windows is provided.

According to the present invention, the light transmittance in the visible light region close to the ultraviolet region is reduced, which increases the deterioration of automobile interior materials more than ever, due to the amount of light increased by the global environment in recent years. Laminated glass can be obtained. In this case, the transmittance T ₄₀₀ of light having a wavelength of 400 nm of the intermediate film is 15% or less, the transmittance T ₄₀₀ of the laminated glass is 10% or less, the visible light transmittance is 70% or more, and the standard light source C of the laminated glass is used. The transmitted light is 0.305 <x <0.334, 0.326 <y <0.373 in the xy chromaticity coordinates, or the yellow index YI of the laminated glass is set to 5 to 8 so that it is close to the ultraviolet region. It is possible to favorably prevent a color tone change caused by shielding light in the visible light region and to improve the appearance from both the inside and outside of the vehicle.

Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of a laminated glass for a vehicle window of the present invention. The basic configuration of the laminated glass 1 in this example is two glass plates 11 and 12 and an intermediate film 30. The glass plates 11 and 12 are laminated via the intermediate film 30. The glass plate 11 is disposed outside the vehicle when the laminated glass 1 is assembled to the vehicle. The intermediate film 30 has a transmittance T ₄₀₀ of light having a wavelength of 400 nm of 15% or less. In addition, the surface of the intermediate film before being usually interposed between a plurality of glass plates is provided with irregularities in order to remove air from the boundary with the glass plate in the laminated glass manufacturing process. Since it is difficult to measure _{T400 in} this state, the value of _T400 of the interlayer film in the present invention is measured after the glass plate is peeled off from the interlayer film once the laminated glass is manufactured.

This laminated glass 1 has optical properties such that the transmittance T ₄₀₀ is 10% or less and the visible light transmittance is 70% or more. Further, in this laminated glass 1, the transmitted light of the standard light source C is 0.305 <x <0.334, 0.326 <y <0.373 in the xy chromaticity coordinates, or the yellow index YI is 5-8. It is.

  Usually, soda lime silica glass can be used for the plurality of glass plates in the present invention. In this case, it may be a colorless transparent glass or a colored transparent glass. At least one of the plurality of glass plates has an actual thickness, the ultraviolet transmittance defined in ISO-9050 is 30% or less, the visible light transmittance measured by the standard light source A is 70% or more, It is preferable that the ultraviolet shielding glass plate has a characteristic that the main wavelength is 480 to 570 nm and the stimulus purity measured by the standard light source A is 6% or less. Furthermore, it is preferable to use this ultraviolet shielding glass plate as the glass plate 11 disposed on the vehicle exterior side in the example shown in FIG.

Further, at least one glass plate among the plurality of glass plates is such that the transmitted light of the standard light source C is 0.305 <x <0.310 and 0.325 <y <0.335 in the xy chromaticity coordinates. It is preferable that it is a colored glass plate which is. Furthermore, it is preferable to use this colored glass plate as the glass plate 11 disposed on the vehicle exterior side in the example shown in FIG. As the colored glass here, it is particularly preferable to use the following green colored glass to make a laminated glass having a solar transmittance _Te of 50% or less. The green colored glass has ultraviolet absorption performance and infrared absorption performance, and includes, for example, soda lime silica glass containing iron. That is, it is a soda-lime silica glass containing 0.3 to 1% of total iron in terms of mass percentage, for example, in terms of Fe ₂ O ₃ , on a soda-lime silica-based mother glass. Furthermore, absorption of light having a wavelength in the near-infrared region is dominated by absorption of divalent iron out of total iron. Therefore, it is more preferable mass in terms _{of Fe} 2 _{O 3} was FeO (2-valent iron) is from 20 to 40% of the mass of total iron as calculated _Fe 2 _{O 3.} In order to impart ultraviolet absorption performance, cerium or the like can be added to soda lime silica-based mother glass. Specifically, it is preferable to use soda lime silica glass having the following composition substantially in terms of mass percentage.
_{SiO 2: 65~75%, Al 2} O 3: 0.1~5%, Na 2 O + K 2 O: 10~18%, CaO: 5~15%, MgO: 1~6%, Fe 2 O 3 in terms of total iron was: 0.3% total cerium CeO ₂ in terms and / or _TiO 2: 0.5 to 2%.

  When using laminated glass for a vehicle window, the thickness of each glass plate is preferably 1.5 to 3.0 mm. In this case, each glass plate can have the same thickness or a different thickness. When using laminated glass for an automobile window, for example, two glass plates are used, and both are made 2.0 mm thick or 2.1 mm thick. Moreover, when using laminated glass for an automobile window, for example, the thickness of the glass plate on the inside of the vehicle is less than 2 mm, and the thickness of the glass plate on the outside of the vehicle is already over 2 mm, thereby reducing the total thickness of the laminated glass. In addition, it can resist external forces from the outside of the vehicle. Each glass plate may be flat or curved. Since vehicles, particularly automobile windows, are often curved, the shape of each glass plate is often curved. Furthermore, each glass plate can be provided with various functional thin films such as water repellency, antifogging, antireflection, and heat ray reflection on a desired surface as necessary.

  The interlayer film in the present invention is preferably a PVB-based interlayer film containing polyvinyl butyral (PVB) as a main component and added with a plasticizer, an ultraviolet absorber, and a fluorescent brightening agent. Furthermore, in order to reduce solar transmittance as a laminated glass, it is preferable to disperse and blend infrared shielding fine particles in PVB. In addition, appropriate coloring components, stabilizers, and the like can be added.

That is, in order to make the transmittance T ₄₀₀ of light having a wavelength of 400 nm of the intermediate film 15% or less, an ultraviolet absorber is added to the intermediate film in the present invention. In addition, the laminated glass is set such that the transmitted light of the standard light source C is 0.305 <x <0.334, 0.326 <y <0.373 in the xy chromaticity coordinates, or the yellow index YI is 5-8. Therefore, the brightening agent in an amount determined according to the optical characteristics of the glass plate to be used and the addition amount of the ultraviolet absorber is added to the intermediate film in the present invention.

  Examples of the ultraviolet absorber include benzophenone, benzotriazole, cyanoacrylate, and salicylate. Among these, for example, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole (trade name “Tinuvin P” manufactured by Ciba Geigy), 2- (2′-hydroxy-3 ′, 5′-di-) t-methylphenyl) benzotriazole (trade name “Tinuvin 320” manufactured by Ciba-Geigy), 2- (2′-hydroxy-3′-t-butyl-5′-methylphenyl) -5-chlorobenzotriazole (Ciba-Geigy) Product name “Tinuvin 326”), 2- (2′-hydroxy-3 ′, 5′-di-amylphenyl) benzotriazole (trade name “Tinuvin 328” manufactured by Ciba Geigy) and the like are preferable. In addition, for example, a hindered amine light stabilizer such as trade name “Adeka Stab LA-57” manufactured by Adeka Argus is also preferable.

  As the fluorescent brightening agent, for example, benzoxazole compounds and coumarin compounds are preferable. Specific examples of the benzoxazole-based compound include 4- (benzoxazol-2-yl) -4 ′-(5-methylbenzoxazol-2-yl) stilbene and 4,4′-bis (benzoxazole-2). -Yl) stilbene, 4,4'-bis (benzoxazol-2-yl) furan and the like, among others, stilbene benzoxazoles such as 4,4'-bis (benzoxazol-2-yl) stilbene Compounds are preferred. Specific examples of the coumarin compound include 3-phenyl-7-aminocoumarin, 3-phenyl-7- (imino-1 ′, 3 ′, 5′-triazine-2′-diethylamino-4′-chloro). -Coumarin, 3-phenyl-7- (imino-1 ', 3', 5'-triazine-2'-diethylamino-4'-methoxy) -coumarin, 3-phenyl-7-naphthotriazole coumarin, 4-methyl- Examples thereof include 7-hydroxycoumarin, and among them, phenylallyl triazolyl coumarin-based compounds such as 3-phenyl-7-naphthotriazole coumarin are preferable.

  Infrared shielding fine particles include Sn, Ti, Si, Zn, Zr, Fe, Al, Cr, Co, Ce, In, Ni, Ag, Cu, Pt, Mn, Ta, W, V, and Mo metals, oxidation Fine particles made of oxides, nitrides, sulfides, or dopes doped with Sb or F. Of these materials, it is preferable to use at least one of tin oxide (ATO) fine particles doped with antimony, ITO fine particles, and zinc oxide fine particles. This is because ATO, ITO, and zinc oxide fine particles are excellent in infrared shielding performance, so that the blending amount in the intermediate film can be reduced. Among these, since ITO fine particles are excellent in infrared shielding performance, it is particularly preferable to use ITO fine particles as infrared shielding fine particles. These infrared shielding fine particles have a particle size of 0.2 μm or less, preferably 0.001 to 0.15 μm.

  Examples of the material for the intermediate film include, in addition to PVB, ethylene-vinyl acetate copolymer. The blending ratio of the ultraviolet absorber is, for example, 0.2 to 10 parts by mass, preferably 0.5 to 8 parts by mass, and more preferably 0.8 to 5 parts by mass with respect to 100 parts by mass of PVB. The compounding ratio of the fluorescent brightening agent is preferably 0.05 to 2, more preferably 0.1 to 1, and particularly preferably 0.2 to 0.8 in terms of a molar ratio with respect to the ultraviolet absorber. In addition, when taking measures to arrange an intermediate film layer containing a large amount of a fluorescent brightening agent, which will be described later, inside the laminated glass as much as possible, the mixing ratio of the fluorescent brightening agent is set to a molar ratio with respect to the ultraviolet absorber. A value of 0.8-2 is preferred.

  Further, a bluing agent in a narrow sense can be used in place of the fluorescent brightening agent, and these can be used in combination. A narrowly defined bluing agent refers to one that emits less light or does not emit light compared to a fluorescent whitening agent. Examples of the bluing agent include “Diaresin BlueLR” manufactured by Mitsubishi Chemical Corporation.

  The dispersion blending ratio of the infrared shielding fine particles is preferably 0.1 to 1 part by mass, particularly preferably 0.1 to 0.5 part by mass with respect to 100 parts by mass of the total mass of the intermediate film. Thus, the desired infrared shielding function according to the present invention can be effectively exhibited, and the haze caused by the mixing of fine particles can be reduced.

  Such an interlayer film in the present invention can be obtained, for example, by the following production method. That is, first, the infrared shielding fine particles are dispersed in the plasticizer of the intermediate film. Next, a plasticizer in which infrared shielding fine particles are dispersed in the resin solution of the interlayer film, an ultraviolet absorber, a fluorescent whitening agent, and an additive used as necessary are added, mixed and kneaded, and the resin material for the film Get. Thereafter, an intermediate film in which an ultraviolet absorber, a fluorescent brightening agent, and infrared shielding fine particles are blended is obtained by forming the film resin material into a film by extrusion molding or the like.

  Further, as the intermediate film, for example, an intermediate film having a sound insulation property having a structure composed of a plurality of layers with different hardnesses by changing the amount of the plasticizer can be used. In this case, it is more preferable to use an intermediate film having a layer structure in which a layer having a low hardness is sandwiched between layers having a high hardness. In such a laminated structure, by adding a large amount of an ultraviolet absorber to a layer disposed on the outer side of the vehicle, an organic infrared absorber that is easily deteriorated by ultraviolet rays can be added to the layer on the inner side of the vehicle.

  In the intermediate film having such a layer structure, a layer to which a fluorescent brightening agent is added can be selected to obtain a laminated glass having a good appearance. That is, the fluorescent brightening agent has an effect of emitting blue-violet light, and has an effect of suppressing the color tone of the laminated glass in which yellow is emphasized by absorbing light having a wavelength near 400 nm as a complementary color of the yellow color tone. However, if the fluorescent brightening agent is added too much, the feeling of glare of the laminated glass becomes noticeable due to light emission. Such a glare sensation leads to a defect in the appearance when the laminated glass is viewed from the outside of the vehicle, or a problem when the occupant visually recognizes the outside of the vehicle through the laminated glass. Therefore, it is preferable to provide the layer in which the fluorescent brightening agent is added in a large amount inside the laminated glass as far as possible from the surface of the laminated glass.

In order to arrange a layer in which a large amount of fluorescent whitening agent is added as much as possible inside the laminated glass from the surface of the laminated glass, it is preferable to constitute the laminated glass as follows, for example.
-Among the glass plates to be used, the thickness of the glass plate arranged on the outside of the vehicle is made larger than the thickness of the glass plate located on the inside of the vehicle, and a layer to which a large amount of fluorescent brightening agent is added is placed on the outside of the vehicle as much as possible Arrange.
Add a large amount of fluorescent brightening agent to the low hardness layer sandwiched between the higher hardness layers.
Of the layer structure in which the layer with lower hardness is sandwiched by the layer with higher hardness, the layer with higher hardness placed on the outside of the vehicle is a layer to which a large amount of fluorescent whitening agent is added, and ultraviolet light is further applied to the outside of the vehicle An intermediate film having a structure in which layers containing a large amount of an absorbent are stacked is used.

  On the other hand, it is preferable that the glass plate used on the side of the layer having a large amount of fluorescent brightener added is the above-described ultraviolet shielding glass plate or colored glass plate. As a result, by providing a layer with a large amount of fluorescent whitening agent at a position away from the other glass plate, the degree of yellow emphasis is reduced as seen from the glass plate side and the glare is reduced, and the fluorescent whitening is reduced. Even when viewed from the glass plate side, the glass plate on the side close to the layer containing a large amount of agent can alleviate the yellow emphasis and reduce the glare.

  Furthermore, in this case, it is preferable to dispose the ultraviolet shielding glass plate or the colored glass plate on the outside of the vehicle from the following points. That is, the ultraviolet absorber shields ultraviolet rays by self-sacrifice. Accordingly, it is preferable to minimize the amount of ultraviolet rays irradiated to the ultraviolet absorber over the long term in order to develop excellent long-term durability. The amount of ultraviolet rays that reach the ultraviolet absorber of the interlayer film is increased by placing an ultraviolet shielding glass plate or a colored glass plate on the outside of the vehicle because the ultraviolet rays that are radiated to the laminated glass are overwhelmingly coming from outside the vehicle. Can be reduced over the long term.

  In addition, depending on the optical properties and thickness of the glass plate used, the amount of UV absorber added in each layer of the interlayer film, etc., the amount of fluorescent brightener added in each layer of the interlayer film can be adjusted By adjusting the thickness of the laminated glass, it is possible to suppress the yellowing from the outside and the inside of the vehicle as a whole, and prevent a feeling of flickering.

  According to the laminated glass for a vehicle window of the present invention, it is possible to suitably prevent the deterioration of the interior material of the automobile, which is promoted also by light in the visible light region close to the ultraviolet region due to the amount of light increased by the recent global environment. At this time, it is possible to appropriately prevent yellowing caused by sufficiently blocking light in the ultraviolet region as in the past, and also suitably prevent glare of the laminated glass generated to prevent this yellowing. The problem of the appearance as a window can be solved.

  The laminated glass for vehicle windows of the present invention can be suitably used particularly for an automobile windshield, and can also be used for elevating windows, side fixing windows, backlights, roof windows, and the like. If it is used for all of the windows of these automobiles, it is possible to suitably shield the ultraviolet rays incident in the automobile and the light in the visible light region close to the ultraviolet region.

It is a schematic sectional drawing which shows an example of the laminated glass for vehicle windows of this invention.

Explanation of symbols

1: Laminated glass 11: Outside glass plate 12: Inside glass plate 30: Intermediate film

Claims (9)

A laminated glass comprising a plurality of glass plates and an intermediate film containing an ultraviolet absorber, wherein the plurality of glass plates are laminated via the intermediate film, wherein the intermediate film has a wavelength of 400 nm. The transmittance T ₄₀₀ is 15% or less, the transmittance T _{400 of the} laminated glass is 10% or less, the visible light transmittance is 70% or more, and the transmitted light of the standard light source C is 0.305 <x in the xy chromaticity coordinates. <0.334, 0.326 <y <0.373, The laminated glass for vehicle windows characterized by the above-mentioned. A laminated glass comprising a plurality of glass plates and an intermediate film containing an ultraviolet absorber, wherein the plurality of glass plates are laminated via the intermediate film, wherein the intermediate film has a wavelength of 400 nm. The vehicle window, wherein the transmittance T ₄₀₀ is 15% or less, the transmittance T _{400 of the} laminated glass is 10% or less, the visible light transmittance is 70% or more, and the yellow index YI is 5 to 8. Laminated glass.   At least one glass plate of the plurality of glass plates is an actual thickness, the ultraviolet transmittance defined in ISO-9050 is 30% or less, the visible light transmittance measured by the standard light source A is 70% or more, The laminated glass for vehicle windows according to claim 1, wherein the laminated glass is an ultraviolet shielding glass plate having a characteristic that the dominant wavelength is 480 to 570 nm and the stimulus purity measured by the standard light source A is 6% or less.   The laminated glass for vehicle windows according to claim 3, wherein the ultraviolet shielding glass plate is disposed outside the vehicle.   At least one of the plurality of glass plates is colored such that the transmitted light of the standard light source C is 0.305 <x <0.310 and 0.325 <y <0.335 in the xy chromaticity coordinates. The laminated glass for vehicle windows according to claim 1, 2, 3, or 4, which is a glass plate.   The laminated glass for vehicle windows according to claim 5, wherein the colored glass plate is disposed outside the vehicle.   The laminated glass for vehicle windows according to claim 1, 2, 3, 4, 5, or 6, wherein the intermediate film is dispersed and blended with infrared shielding fine particles.   The laminated glass for vehicle windows according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the intermediate film has a layer structure in which a plurality of layers are laminated. The mating solar transmittance _{T e} of the glass is 50% or less, laminated glass for a vehicle window according to claim 7 or 8.

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