JPH08231245A - Uv ray and infrared ray absorbable glass - Google Patents

Abstract

PURPOSE: To prepare a UV ray and infrared ray absorbable thin film which is transparent and capable of shielding the UV rays and increased remarkably in wear resistance, resistance to scuffing and durability without damaging an optical characteristic and a heat ray and infrared ray shielding characteristic, especially can shield sufficiently that near 400nm, and capable of being used for a long term in single plate as a window profile for car as well as window profile for building. CONSTITUTION: After forming the UV ray and infrared ray absorbable thin film by applying a silicone based primer coating soln. constituted by dissolving and adding a fluorescent fleacher, a UV ray absorber and an infrared ray absorber on the surface of a transparent glass substrate and heating to cure the soln., a silicone based hard coating soln. is applied to form a coated film.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a glass coated with a coating film having excellent ultraviolet and infrared absorption properties,
The present invention relates to an ultraviolet and infrared absorbing glass which has excellent wear resistance, scratch resistance and durability while maintaining excellent properties, and is particularly excellent when used in a single plate.

These are UV / infrared absorbing glass useful as window materials for UV / IR shielding filters such as windows for buildings, houses, vehicles, automobiles, ships, aircrafts, and various display devices.

[0003]

2. Description of the Related Art Conventionally, treatment methods for imparting ultraviolet and infrared absorption to a glass substrate or the like have generally been roughly classified into the following three types.

First, (1) a method of mixing and blending an ultraviolet and infrared ray absorbing compound with glass itself. For example, various glass compositions in which a metal compound is melted and added into glass (for example, JP-A-4-224133), and then (2) a method of laminating an ultraviolet and infrared ray absorbing transparent film on the glass surface. For example, a laminated glass sandwiched by a polyvinyl butyral interlayer film containing an ultraviolet and infrared absorber (see, for example, JP-A-59).
-152249 gazette) etc. Furthermore, (3) a method of forming a transparent ultraviolet / infrared absorbing transparent film on the glass surface. For example,
A glass substrate on which zinc oxide and aluminum-containing zinc oxide are stacked by a vapor deposition method such as sputtering (for example, Japanese Patent Publication No. 44721/1992, Japanese Patent Publication No. 133004/1992) or an ultraviolet / infrared absorber. Liquid phase film forming method using a dissolved resin solution (eg, Japanese Patent Application Laid-Open Nos. 4-160037 and 5-42622) or liquid phase film forming method using a resin solution in which an ultraviolet / infrared absorber is dispersed (eg, Japanese Patent Application Laid-Open No. 2-
No. 75683 gazette).

[0005]

As described above, for example, none of the ones described in Japanese Patent Laid-Open No. 224133/1992 is not suitable for high-mix low-volume production and has insufficient UVA (long wavelength ultraviolet) absorption. It is something.

Further, the one disclosed in JP-A-59-152249 has improved chemical resistance, scratch resistance, and durability as compared with the case of using the resin film alone, but uses two or more plate glasses. It has poor shape conformability, and it is difficult to reduce its weight because it is quite thick.

Further, those disclosed in Japanese Patent Publication No. 44721/1992 or Japanese Unexamined Patent Publication No. 133004/1992 are ZnO
Since it becomes an absorption base, there is concern about moisture resistance, chemical resistance, and durability, and UVA absorption is insufficient.

Further, in the conventional method using an organic compound-based coating agent described in JP-A-2-75683 and JP-A-4-160037, it is necessary to add a large amount of an ultraviolet / infrared absorber, and a silicone-based agent is used. Only the matrix resin layer that does not use a resin is considerably inferior in terms of chemical resistance, scratch resistance, durability and the like.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been made in view of such problems in the prior art, and it is an optical brightener for shielding UVA very sharply to the boundary of the visible region and an infrared absorber. While being applied to the coating agent composition, it is dissolved and added to a silicone-based primer coating solution that has good adhesion to various substrates, especially transparent substrate surfaces and excellent surface hardness, and makes an ultraviolet absorber coexist. By absorbing fluorescence and improving light resistance by this, a coating film in which fluorescence is inconspicuous is formed at a relatively low temperature, and by further coating and protecting this with a silicone-based coating solution serving as a top coat,
The durability such as scratch resistance, abrasion resistance, and chemical resistance, which are problems, is remarkably improved. This product is a single plate that can be fully used as an exterior material, is transparent even under severe conditions such as for vehicles, sharply shields UVA, and at the same time exhibits sufficient heat ray absorption performance, which is maintained for a long time. The present invention economically provides a useful UV-infrared absorbing glass in a two-layer structure.

That is, according to the present invention, the surface of a transparent glass substrate is coated with a silicone primer coating solution prepared by dissolving and adding a fluorescent whitening agent, an ultraviolet absorber and an infrared absorber, and the mixture is heated and cured to absorb ultraviolet and infrared rays. An ultraviolet-infrared-absorbing glass, which is formed by forming a thin film and then applying a silicone-based coating solution having a higher surface hardness to form a protective film.

Further, the above-mentioned UV-infrared absorbing glass, wherein the silicone-based primer is an organopolysiloxane-based. Further, the above-mentioned ultraviolet and infrared absorbing glass, wherein the silicone-based primer is a polyester-modified silicone-based.

Further, each of the above-mentioned ultraviolet and infrared absorbing glasses is characterized in that the silicone coating solution is mainly composed of an organopolysiloxane.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Here, as described above, the fluorescent whitening agent is capable of absorbing in the ultraviolet region, emitting fluorescence in the visible region, and dissolved and added to the silicone-based primer coating solution. Any material may be used as long as it does not undergo thermal denaturation during heat curing of the coating film, and it has appropriate heat resistance and its absorption wavelength is in the ultraviolet / visible region boundary (around 400 nm). For example, Uvitex-OB ( Ciba Geigy, 2,5 bis (5'-tert-butylbenzoxazolyl) thiophene), or EB-501 (Mitsui Toatsu Dyes), Nikkafluor SB, KB, EFS, OB (Nippon Kagaku Kogyo) Manufactured) and the like.

Examples of the ultraviolet absorbers that can coexist include benzophenone type, benzotriazole type, cyanoacrylate type, salicylate type and indole type.

Examples of the infrared absorbers that can coexist include polymethylene type (cyanine, pyrylium,
Squarylium, croconium, azurenium, etc.),
Examples thereof include phthalocyanine-based, dithiol metal complex-based, naphthoquinone-based, anthraquinone-based, indole phenol-based, azo-based, triallylmethane-based, immonium-based, diimonium-based compounds.

The use ratio of the fluorescent whitening agent, the ultraviolet absorber and the infrared absorber is 1: 0.5: 0.3 by weight.
To about 1:10:10, and a preferable range for ensuring more stability is about 1: 3: 0.5 to 1: 6: 6. When the amount of the optical brightener increases, the transparency deteriorates due to fluorescence. ,
If it is too small, the desired UVA absorption capacity will not be obtained. These are 0.1-10% by weight of the primer coating solution as a total.
However, it is uneconomical to add more than necessary even if there is a margin in solubility.

Further, in the silicone-based primer, since it is necessary to sufficiently dissolve the fluorescent whitening agent, the ultraviolet absorber and the ultraviolet absorber described above, a ketone-based solvent such as cyclohexanone or toluene having a dissolving power is used. Those dissolved in an aromatic solvent are preferred.

Furthermore, examples of the silicone resin component include those consisting only of organosiloxane polymers and copolymers with acrylic resins, urethane resins, fluorine resins, polyester resins, etc. In order to improve heat resistance, abrasion resistance, adhesion and transparency, for example, commercially available silicone varnish for paints or silicone modified varnish [for example, manufactured by Toshiba Silicone Co., Ltd. or Shin-Etsu Chemical Co., Ltd.] or Bell Clean. It may be prepared according to the relationship of concentration, viscosity or film thickness by using [NOF CORPORATION] or OS-800 (manufactured by Daihachi Chemical Co., Ltd.), and further ultrafine oxide particles such as silica and alumina. Should be added. The solid concentration is about 5 to 50 wt%,
The viscosity is about 2 to 100 cP, and the primer film thickness is
It is preferably about 0.5 to 10 .mu.m, and as described above, the top film thickness is preferably about 0.5 to 5 .mu.m, so that the total film thickness is preferably about 1 to 15 .mu.m.

Particularly, for example, for Bellclean (melamine-crosslinking type silicone modified acrylic polymer), a preferable concentration (to silicone type primer solution) is about 10 to 30 wt.
%, And if it is less than about 10 wt%, the coating film tends to be whitened, and if it exceeds about 30 wt% and too much, the adhesiveness is deteriorated and cracks appear. Also for example OS800
The preferred concentration of the (silicone polymer) is about 5 to 30 wt%, and if it is less than about 5 wt%, it will affect the hot water resistance and the adhesion to the silicone hard coat film to be coated, which is too small. And the effect of adhesion disappears, and if it exceeds 30 wt% and is too much, whitening tends to occur. Furthermore, for example, colloidal silica XBA
The preferable concentration of (xylene, n-butanol dispersion type silica ultrafine particle organosol) is about 20 to 50 wt%, and when it is less than about 20 wt%, cracks start to be observed and exceed about 50 wt%. If it is too much, whitening will occur easily. Furthermore, for example, the addition amount of S510 (epoxysilane), which is a silane coupling agent for further improving adhesion, is about
It is preferable to add about 0.5 to 20 wt%, and if it is less than about 0.5 wt%, it will mainly affect the adhesion to glass, and if it is too small, the adhesion effect will be lost, and it will be over 20 wt% and too much. Becomes uneconomical.

Furthermore, the ultraviolet-infrared-absorptive silicone primer prepared as described above has a uniform film thickness, for example, a dipping method, a spray method,
It is applied by a flow coating method, a spin coating method, a roll coating method, a printing method or the like to form a film, which is heated and dried at about 80 ° C. or higher for about 1 hour. If the heating is insufficient, the silicone hard coat is protected. When the film is applied, the primer component is eluted to easily cause clouding or cracking, the hot water resistance is deteriorated, and if heating is excessive, coloring and ultraviolet absorption performance are reduced.

Further, the coating environment is, for example, about a temperature.
About 15 to 25 ° C, a humidity of about 40 to 50 RH%, and a cleanliness of about 10,000 or less are preferable from the viewpoint of preventing coating film defects. It goes without saying that a flow improver, a rheology control agent or the like may be appropriately added in order to improve the coating performance.

Further, the silicone-based hard coating solution is an organopolysiloxane-based solution such as hydrolyzed tetraethoxysilane or colloidal silica, which is expected to have a siloxane bond having a high cross-linking density, and is basically composed of 3 such as methyltriethoxysilane. Those based on an alcoholic solution of a siloxane prepolymer obtained by hydrolyzing a functional organoalkoxysilane are preferable. For example, the coating composition described in JP-A-62-220531 filed by the present applicant. Those containing colloidal silica are preferred, and commercially available products such as Tosgard 510
Examples include [Toshiba Silicone Co., Ltd.] and Si Coat 2 [Dahachi Chemical Co., Ltd.]. Furthermore, those obtained by hydrolyzing a tetrafunctional alkoxysilane such as tetraethoxysilane or those obtained by adding and hydrolyzing tetrafunctional silane from the initial stage are more preferable in terms of hardness.

For coating film formation of the silicone-based hard coating solution, for example, a dipping method, a spray method, a flow coating method, a spin coating method, a roll coating method or a printing method is used so as to obtain a uniform film thickness. It is possible, and the film thickness is preferably about 1.0 to 5.0 μ,
If it is thin, the effect of strengthening the surface protection is reduced, and if it is thick, cracks are likely to appear during heat-drying and curing, and it is not economical. Furthermore, about 10% is necessary for the heat-drying and curing because the first layer contains the organic UV absorber, optical brightener and resin.
It is necessary to perform the treatment at a temperature of about 0 ° C or higher and about 250 ° C or lower, preferably when the transparent substrate is a glass plate or the like.
A treatment at about 130 to 230 ° C. for about 10 to 60 minutes, preferably about 30 minutes or so, is preferable for increasing the surface hardness.

The environment for application is similar to that of the silicone-based primer, for example, the temperature is about 25 ° C. and the relative humidity is about 20 to 50% RH, preferably about 40% RH.
It is preferable to perform in an air-conditioned environment of about the front and rear. It goes without saying that a flow improver, a rheology control agent or the like may be appropriately added in order to improve the coating function.

Furthermore, the transparent glass substrate is preferably an inorganic glass such as float glass, and is not particularly limited to the shape and the like, and various shapes and sizes or configurations such as bending are possible. Needless to say, it can be used not only as plate glass but also as various tempered glass, strength-up glass, flat plate or single plate, and can be applied as multi-layer glass or laminated glass.

As described above, according to the present invention, the surface of the coating film, which has a unique constitution and is excellent in ultraviolet and infrared ray shielding properties, is a silicone primer solution in which a fluorescent whitening agent, an ultraviolet absorber and an infrared absorber coexist. In addition, since it is a laminate having a silicone-based hard coat film having excellent surface hardness formed as a protective film, it has excellent ultraviolet-infrared absorptivity and can be formed at a relatively low temperature as a film in which the fluorescence of the fluorescent whitening agent is inconspicuous. Moreover, UVA can be sharply shielded to the boundary of the visible region, and it has excellent adhesion, chemical resistance, scratch resistance, and durability, and in particular, it has a pencil hardness of 9H or higher without the occurrence of defects such as cracks. The film strength and smoothness are also improved, and the conventional wear resistance, scratch resistance, and durability are further improved, the field of view can be secured sufficiently, and the comfortability is markedly improved. It can be used as a single plate or exterior for buildings, houses, vehicles, or various window materials, especially for windshields of automobile window glass, rear glass and side door glass that moves up and down, sunroof glass, etc. It can be used for a long period of time even under various operating conditions and environments, and it has a transparent and transparent material such as a useful UV and infrared shielding window that does not have a glare due to visible light reflection or radio wave shielding due to radio wave reflection. An ultraviolet-infrared-absorbing glass can be obtained easily and efficiently and inexpensively by a simple coating process.

[0027]

The present invention will be described below in detail with reference to examples. However, the present invention is not limited to the embodiment.

(Preparation of UV-infrared absorbing silicone-based primer) While stirring in cyclohexanone at room temperature, UVITEX-OB (manufactured by Ciba Geigy) as a fluorescent whitening agent, TINUVIN327 (manufactured by Ciba Geigy) as an ultraviolet absorbent, and NIR as an infrared absorbent. -AM1 (manufactured by Teikoku Chemical Industry Co., Ltd.) and SIR 10
3, 159, PA1001 (Mitsui Toatsu Fine Co., Ltd.) and TX-207A
(Nippon Shokubai Co., Ltd.) was added at the ratio shown in Table 1, then Bellclean No1000 (Nippon Yushi Co., Ltd.) was added, and further organocolloidal silica XBA (Nissan Chemical Co., Ltd.) and OS.
-800 [manufactured by Daihachi Chemical Co., Ltd.] and S510 (manufactured by Chisso Co.) as a silane coupling agent were added to obtain a UV-infrared absorbing silicone-based primer.

(Preparation of Silicone Hard Coating Solution) 100 g of methyltriethoxysilane, 43 g of tetraethoxysilane and 18 g of 3-glycidoxypropyltrimethoxysilane were placed in a 500 ml round bottom flask equipped with a stirrer, and 0.45 g of phthalic anhydride was added. Addition, heating in a hot water bath to about 40 ° C to dissolve, and then IPA-ST which is an organocolloidal silica solution (manufactured by Nissan Kagaku Co., average particle size of about 15 μm, S
iO ₂ content about 20%] 143 g was added, 98 g of water was added little by little, and the reaction was carried out at about 40 ° C for about 2 days.
[Tosoh Corp., ULC802A) number average molecular weight approx.
A composition having a solid content of about 28 wt% was obtained at about 100.

To this was added 163 g of isopropyl alcohol to obtain a composition having a solid content of about 20 wt%. About 0.1 part of dicyandiamide as a curing catalyst was added to the composition to obtain a silicone hard coating solution.

(Performance Evaluation Method) Ultraviolet and Infrared Absorption: The absorption spectrum pattern was measured with a spectrophotometer. (For example, Hitachi-U4000 type) Fluorescence: Visual observation under outdoor natural sunlight. (There is no emission of light and no cloudiness.) Abrasion resistance: Conforms to JIS R 3221, wear wheel CS-10F, load 500g, ΔH (haze) value (%) after 1000 rotations.

Surface hardness: Pencil hardness. Adhesion: In accordance with JIS K5400, the cross-cut (1mm mouth) tape peeling remaining number is displayed as / 100.

Hot water resistance: Appearance and adhesion after about 2 hours of boiling water (100 ° C.). Chemical resistance: Acid resistance --------- 1N HCl immersion test for 24hr. Alkali resistance --- 1n NaOH immersion test for 24hrs.

Solvent resistance ------- 100% ethanol 24 hours in immersion test. Weather resistance: According to JIS D0205, the time until visual abnormality (film crack, peeling, noticeable yellowing) is observed on the sunshine carbon weather meter. (However, irradiation on the glass surface) Example 1 A clear float glass substrate having a size of about 300 mm x 300 mm and a thickness of about 3 mm was sequentially washed with a neutral detergent, water rinse, alcohol, dried, and then wiped with acetone to form a film. A glass substrate was used.

One side of the glass substrate for coating was film-masked in an air-conditioned clean room at about 25 ° C. and about 40% RH, and immersed in a prepared ultraviolet / infrared absorbing silicone-based primer solution shown in Table 1, It was pulled up at a speed of about 1 cm 3 / sec and dried and cured at about 170 ° C. for about 30 minutes to form an ultraviolet and infrared absorption film having a thickness of about 6 μm.

Next, the glass surface of the glass substrate provided with the ultraviolet and infrared ray absorbing film is film-masked, dipped in the prepared silicone-based hard coat solution described above, applied only on the film surface, and then air-dried for about 10 minutes, Then, it was placed in a hot-air circulating dryer at about 175 ° C. for about 1 hour and cured to obtain a silica-based protective film of about 3 μm. The film was colorless and transparent and had no crack. During the drying process in the far-infrared furnace, it could be cured at about 200 ° C in about 15 minutes.

The obtained ultraviolet and infrared absorbing glass was evaluated according to the above-mentioned performance evaluation method. As a result, as shown in Fig. 1, even if a specific silica-based thin film is further coated, it is slightly greenish, but it blocks almost 100% of UVA, and the solar radiation transmittance is 50% or less. In this state, the heat ray was sufficiently shielded, and the emission of light was bothered and there was no cloudiness, and the surface hardness was a pencil hardness of 9H or more, which was hard, and the haze value after the Taber test (△
H) is 4.0, the scratch resistance is sufficiently excellent, the weather resistance is 3000 hours or more, there is no visual abnormality, and the adhesion, hot water resistance, and chemical resistance are not abnormal, and an ultraviolet and infrared absorbing glass having excellent durability is obtained. It was

Examples 2 to 5 The same primer solution as shown in Table 1 was used on the same glass substrate as in Example 1, and the same film formation as in Example 1 was performed.
An ultraviolet and infrared absorption film having a film thickness of about 5 to 7 μm was formed.

Then, the glass surface of the glass substrate provided with the ultraviolet and infrared ray absorbing film is film-masked, dipped in the prepared silicone-based hard coat solution described above, applied only on the film surface, and air-dried for about 10 minutes, It was put in a hot air circulation dryer at about 175 ° C. for about 1 hour to cure, and a silica-based protective film of about 3 μm was obtained.

The obtained ultraviolet and infrared absorbing glass was evaluated in the same manner as in Example 1. As a result, for example, the haze value (ΔH) after the Taber test is 4.5 in Example 2 and 3. in Example 3.
9, Example 4 was 3.6, and Example 5 was 4.0, and the abrasion resistance was remarkably excellent. The other evaluations were the same as those of Example 1, and the desired excellent UV-infrared ray absorbing glass was the same as Example 1. Met.

Example 6 A glass substrate similar to that used in Example 1 was treated with a primer solution shown in Table 1 instead of Bellclean [Nippon Oil & Fats Co., Ltd.] KR5235 [Shin-Etsu Chemical Co., Ltd. polyester modification]. Using a silicone varnish] and by the same film formation as in Example 1, an ultraviolet and infrared absorption film having a film thickness of about 7 μm as shown in Table 1 was formed.

Next, the glass surface of the glass substrate with the ultraviolet and infrared ray absorbing film is film-masked, dipped in the above-prepared silicone hard coat solution, coated on only the film surface, and dried by circulating hot air at about 175 ° C. It was put in a container for about 1 hour and cured to obtain a silica-based protective film of about 3 μm.

The obtained ultraviolet and infrared absorbing glass was evaluated in the same manner as in Example 1. As a result, for example, the haze value (ΔH) after the Taber test is 4.3, and the scratch resistance is remarkably excellent.
Other evaluations gave the same results as in Example 1, and the desired ultraviolet and infrared absorbing glass was obtained as in Example 1.

Comparative Example 1 As shown in Table 1, as in Example 1 except that a UV brightening agent UVITEX-0B (manufactured by Ciba Geigy) and an ultraviolet absorbent TINUVIN327 (manufactured by Ciba Geigy) were used. Similarly, an ultraviolet absorbing glass substrate was obtained.

The obtained ultraviolet absorbing glass substrate was good in appearance, but could not shield 100% of UVA and had a solar radiation transmittance of 90% or more. It was hard to call a glass plate.

Comparative Example 2 As shown in Table 1, except that an ultraviolet absorbing silicone-based primer prepared by using a fluorescent whitening agent UVITEX-OB (manufactured by Ciba Geigy) and an infrared absorbent NIR-AM1 (manufactured by Teikoku Kagaku Sangyo) was used. An ultraviolet / infrared absorbing glass substrate was obtained in the same manner as in Example 1.

With respect to the obtained ultraviolet and infrared ray absorbing glass substrate, only a slight amount of blue fluorescence was visually perceived and a part of the visible region near ultraviolet was blocked, but the UVA up to that point was used.
However, the weather resistance was about 800 hours, and it was hard to say that it was a UV / infrared absorbing glass plate at the very beginning.

Comparative Example 3 As shown in Table 1, as in Example 1 except that only the UV absorbing primer prepared with the UV absorber TINUVIN327 (manufactured by Ciba Geigy) and the infrared absorber NIR-AM1 (manufactured by Teikoku Chemical Industry) was used. In the same manner, an ultraviolet / infrared absorbing glass substrate was obtained.

With respect to the obtained ultraviolet and infrared ray absorbing glass substrate, the shielding in the vicinity of 400 nm is insufficient and the weather resistance is 12
It was about 00 hours, and it was hard to say that it was an expected ultraviolet and infrared absorbing glass plate.

Comparative Example 4 An infrared absorbing glass substrate was prepared in the same manner as in Example 1 except that an infrared absorbing primer prepared only from the infrared absorbing agent NIR-AM1 (manufactured by Teikoku Kagaku Sangyo Co., Ltd.) was used as shown in Table 1. Obtained.

The obtained infrared absorbing glass substrate had no ultraviolet ray cutting performance and weather resistance of about 800 hours, and it was hard to say that it was an expected ultraviolet ray infrared absorbing glass plate. .

[0052]

[Table 1]

In Table 1, (a) UVITEX-OB (manufactured by Ciba Geigy). (B) TINUVIN327 (made by Ciba-Geigy), (b ') TINUVIN213 (made by Ciba-Geigy), (b'') TINUVIN900 (made by Ciba-Geigy). (C) NIR-AM1 (manufactured by Teikoku Chemical Industry),
(C ') SIR159 (manufactured by Mitsui Toatsu Fine),
(C '') PA1001 (manufactured by Mitsui Toatsu Fine),
(C ''') SIR103 (manufactured by Mitsui Toatsu Fine).
(C ″ ″) TX207A (manufactured by Nippon Shokubai). * Indicates KR5
235 (manufactured by Shin-Etsu Chemical Co., Ltd.). ** indicates cyclohexanone (diluting solvent).

[0054]

As described above, according to the present invention,
It is transparent and can block UV and infrared rays without impairing the optical properties, especially UVA almost completely.
It also has good heat ray absorption performance, has significantly improved habitability, and has dramatically improved adhesiveness, chemical resistance, scratch resistance, and durability, and is a single plate for windows of buildings, houses, vehicles, etc. Of course, it can also be used as an exterior,
In particular, it is possible to impart various functionalities such as long-term use even under severe operating conditions and environments such as windshields of automobile window glass, rear glass, side door glass that moves up and down, and sunroof glass. A useful ultraviolet / infrared ray absorbing glass that can be widely adopted in various fields can be provided easily and inexpensively.

[Brief description of drawings]

FIG. 1 shows the transmittance of an ultraviolet-infrared ray absorbing glass of Example 1 of the present invention and a normal glass substrate (float glass 3 mm thick).

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location E06B 9/24 E06B 9/24 A (72) Inventor Masahiro Shogawa 1510 Oguchi-cho, Matsusaka-shi, Mie Central Glass Co., Ltd. Glass Research Institute

Claims (4)

[Claims] 1. A surface of a transparent glass substrate is coated with a silicone-based primer coating solution prepared by dissolving and adding a fluorescent whitening agent, an ultraviolet absorber and an infrared absorber, and heat-cured to form an ultraviolet-infrared absorbing thin film. An ultraviolet-infrared-absorbing glass, characterized in that it is formed by applying a silicone-based hard coating solution to form a coating film. 2. The ultraviolet / infrared absorbing glass according to claim 1, wherein the silicone-based primer is an organopolysiloxane-based. 3. The ultraviolet / infrared absorbing glass according to claim 1, wherein the silicone-based primer is a polyester-modified silicone-based material. 4. The ultraviolet / infrared absorbing glass according to claim 1, wherein the silicone hard coating solution is mainly composed of an organopolysiloxane.