JPH1072236A - Dark gray glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain glass highly absorbing UV and IR, especially shielding UV B, more especially shielding UV A, protecting privacy, assuming a dark gray tone, excellent in easy temperability, improving comfortableness and safety, harmless to the human body and environment, having high environmental resistance, capable of reducing weight and suitable for use as window glass for construction, especially for an automobile. SOLUTION: This glass is based on soda lime-silica glass and essentially contains 0.75-1.50wt.% Fe2 O3 (total iron), 70-250ppm CoO, 10-50ppm Se and 0-330ppm NiO and/or Cr2 O3 as coloring components. It has <=50% visible light transmissivity Tv, <=45% solar radiation transmissivity Ts, <=15% UV transmissivity Tuv, $;8% UV transmissivity Tuv350 at 350nm wavelength and <=35% UV transmissivity Tuv370 at 370nm wavelength in the case of 3.5mm plate thickness in measurement with a D65 light source.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides relatively low transparency, has almost the same color tone as existing gray-colored glazings, and has remarkably excellent privacy performance, ultraviolet absorption performance and heat insulation performance (heat ray absorption performance). ), Especially blocking ultraviolet B (ultraviolet light having a wavelength of 290 to 320 nm, hereinafter referred to as UVB) and ultraviolet A (ultraviolet light having a wavelength of 320 to 400 nm;
It is called UVA. ), Which enhances comfort and safety, and can be reduced in weight in various shapes. Needless to say, the present invention provides a simple and efficient dark gray glass which is particularly useful as a vehicle window glass, particularly as an automobile window glass.

[0002]

2. Description of the Related Art In recent years, in order to save energy such as cooling load, energy saving such as cooling load has been applied to window glass for automobiles as well as for buildings, and multifunctionalization such as reflection and absorption of heat rays has been added to the glass itself or the glass surface. As a result, the needs for flat glass articles that lead to higher livability and more safety both physically and physically have been rapidly increasing. Among them, a dark gray color that has a much better ultraviolet shielding performance than humans, is gentle to humans and materials, and has a privacy performance.
There is a growing demand for base glasses.

[0003] For example, Japanese Patent Laid-Open No. 8-67526 describes a gray glass composition, SiO ₂ 66-75% by weight,
_{Na 2 O10~20%, CaO 5 ~15} %, MgO O ~5%, Al 2 O 3 0~
Base glass portion consisting of 5% and K ₂ O0~5%, and Fe ₂ O
₃ (total iron) 0.15 to 1.2%, FeO 0.3% or less, in ppm
With a colorant part consisting essentially of CoO 60-180, Se 0-30, NiO 0-550, the glass is 3.9 mm thick and 20-50%
A dull gray colored glass composition having a luminous transmittance of.

[0004] Among them, in Table 1, Fe ₂ O is used as a colorant portion.
_3, CoO, Cr among each component composition of Se are described ₂ O
36 to 13 ppm, containing 1 ppm of NiO, in Table 2, each component composition of Fe ₂ O ₃ , CoO, Se, NiO is described as a colorant portion, and _{6 to} 13 ppm of Cr ₂ O ₃ is contained, Table 3 in Fe ₂ O ₃ as a coloring agent moiety, CoO, Cr ₂ O ₃ 5~8ppm among each component composition of Se have been described, comprise NiO 3 ppm, further total solar ultraviolet transmittance of the glass (TSUV An additional UV-absorbing material to reduce the content of the glass composition, up to 2.0% by weight of the glass composition, selected from the group consisting essentially of cerium, vanadium, titanium and molybdenum and combinations thereof. And the like are described.

[0005] For example, Japanese Patent Application Laid-Open No. 8-59287 discloses a gray soda lime glass, in which iron, selenium, cobalt and chromium are used as coloring agents in a glass by weight of Fe ₂ O _3. 0.5-0.9%, Co 0.012-0.025%,
_{Se 0.0025 ~0.010%, Cr 2 O} 3 0.005 present in an amount corresponding to 0.020%, the proportion of the colorant is glass, the light transmittance of less than 30% (TL) and 12% less than the excitation purity (P) A gray soda lime glass having a ratio of

For example, Japanese Patent Application Laid-Open No. 8-157232 discloses
Gray-colored glass is described, in weight percent SiO_Two: 65
~ 75%, Al_TwoO_Three: 0.1 to 5.0%, Na_TwoO + K_TwoO: 10-18%, Ca
O: 5 to 15%, MgO: 1 to 6%, SO_Three: Consists of 0.05-1.0%
Fe per 100 parts by weight of mother component _TwoO_Three Total iron represented by: 0.8-1.
4 parts by weight, FeO: 0.21 part by weight or less, TiO_Two: 0.05 to 1.0 weight
Parts, Se: 0.0005 to 0.015 parts by weight, CoO: 0.02 to 0.05 parts by weight
Are disclosed.

For example, Japanese Patent Application Laid-Open No. 5-330847 describes a colored glass composition and a window glass using this glass. The main component is% by weight, SiO ₂ : 64 to 75%, Al ₂ O
_{3: 0~5%, B 2 O} 3: 0~5%, CaO: 5 ~15%, MgO: 0 ~5
_{%, Na 2 O: 10 ~18} %, K 2 O: be at 0-5%, the total of alkaline earth oxides are the 6-16 wt%, the total of alkali metal oxides is 10-20 wt% And as a coloring agent, Fe ₂ O ₃ (total iron): 1.4 to 4% by weight, CoO: 0 to 0.05% by weight, and when the Fe ₂ O ₃ content is less than about 2% by weight,
O content of greater than about 0.02 wt%, and further comprises selenium and chromium oxide as required, a colored glass composition the sum of CoO + Se + Cr ₂ O ₃ is 0.24 wt% or less,
The glass made from the colored glass composition has a total light transmittance (TL _A ) of the light source _A of about 20% or less and a total energy transmittance (T _E ) of about 12% or less for a thickness of 3.85 mm. Is described.

For example, Japanese Patent Publication No. 5-41574 discloses black
Crude, cloudy gray, nickel-free glass composition
Are described, and in weight%, SiO_Two68-75%, Na_TwoO10 ~
18%, CaO5 ~ 15%, MgO0 ~ 5%, Al_TwoO_Three0-5%, K_TwoO 0
~ 5%, including traces of melting and refining aids, if any
Alkaline glass composition and essentially iron oxide [III] Fe _TwoO
_Three(Total iron) 0.6-1.0%, selenium Se 0.005-0.02%, acid
Cobalt [II] CoO 0.01-0.02%, at least
A colorant consisting of a composition in which 15% of the iron is divalent iron
A cloudy gray glass composition with the glass 5.
Light transmission less than 20% and total sun less than 40% at 56mm thickness
Compositions having energy transmission are disclosed.

[0009] For example, Japanese Patent Publication No.
Gray infrared absorbing glass is described, in weight percent,
SiO_Two66-75%, Na_TwoO10-20%, CaO5-15%, MgO0-5
%, Al _TwoO_Three0-5%, K_TwoO 0-5% and essentially
Coloring component consisting of: Fe_TwoO_Three(All iron) Exceeds 1.00% and 1.
Up to 7%, FeO at least 0.27%, Se 0.0020-0.0050
Gray glass with% CoO 0.0100-0.0200%
A composition having a light transmittance and a transmittance of not more than 32% at a thickness of 3.9 mm.
Glass with total solar infrared transmission of less than 15%
The product is disclosed, the UV transmittance is about 2.84 ~ 18.69%
It is stated that there is.

Further, for example, Japanese Patent Application Laid-Open No. Hei 6-247740, which has already been filed by the present applicant, describes a neutral gray color tone glass, which is based on soda-lime-silica glass and has a weight% as a coloring component. As indicated, Fe ₂ O ₃ (total iron) 0.45 to 0.7
5, of which FeO 0.08 to 0.30, TiO _{2 0 to} 0.70, and p
In pm display, CoO140~250, NiO O ~350, Cr 2 O 3 0 ~3
50, Se10 ~ 60 basically contained, dominant wavelength 490 ~ 5
Disclosure of 75nm and 25% UV transmittance
It was also stated that:

[0011]

SUMMARY OF THE INVENTION As described above,
The gray glass composition described in 8-67526 has a coloring component.
Although it is Fe ₂ O ₃ -Se-CoO-NiO system, for example,
When the composition of NiO is optional, and when there is essentially no NiO, the composition of Se
When the component composition is 60 to 160 ppm and the NiO component is essentially present, the Se component composition is 0 to 25 ppm and the CoO component composition is
NiO component 60~180ppm is the 25～550Ppm, yet substantially Cr ₂ O ₃ component composition is that containing 6~13ppm or 5～8Ppm. Furthermore, it is not always possible to fully and stably exhibit ultraviolet absorption performance, and in some cases, the total solar ultraviolet transmittance (TSUV; 300 to 390 nm) of glass
) Must include an additional UV absorbing material selected from the group of oxides consisting essentially of cerium, vanadium, titanium and molybdenum and combinations thereof.

The gray soda lime glass described in JP-A-8-59287 has a coloring component of Fe ₂ O ₃ -Se-Co-Cr ₂ O ₃
For example, the Fe ₂ O ₃ component composition is substantially up to about 0.7 wt%, the Co component composition is 170 to 200 ppm, the Cr ₂ O ₃ component composition is 160 to 200 ppm, and the Se component composition is 50 to 80 ppm. Thus, both the Co component composition and the Cr ₂ O ₃ component composition are simultaneously contained in relatively large amounts.

The dark gray glass described in Japanese Patent Application Laid-Open No. 8-157232 has a coloring component of Fe ₂ O ₃ —TiO ₂ —Se—CoO system, for example, containing 0.05 to 1.0 part of TiO ₂ component composition. , The TiO ₂ component composition is necessary to reduce the UV transmittance and visible light transmittance, and to ensure that the UV absorption performance is sufficiently stable and reliable, and when there is no TiO ₂ component This is because bubbles remaining in the glass increase.

The colored glass composition described in JP-A-5-330847 and the window glass using this glass can be said to have a Fe ₂ O ₃ -Se-CoO-Cr ₂ O ₃ coloring component. The composition of Fe ₂ O ₃ is as large as 1.4 to 4 wt%, and the composition of CoO is optional. For example, the composition of Fe ₂ O ₃ is 1.45 wt%, the composition of Se is 24 ppm, and the composition of CoO is 280 ppm. Dominant wavelength λ is 48
If the thickness is 5 nm, the visible light transmittance is low, but it cannot be said that the ultraviolet absorption performance is sufficiently stable and surely exhibited.

The glass composition described in JP-B-5-41574, which is dark, cloudy gray and does not contain nickel, has a coloring component of Fe ₂ O ₃ —Se—CoO system and a composition of 50%. ~ 20
0 ppm, CoO component composition is 100 to 200 ppm, for example, when the Fe ₂ O ₃ component composition is substantially 0.70 to 0.56 wt% and the Se component composition is
A CoO component composition 140 ～180Ppm in 55～100Ppm, further for example, Fe ₂ O ₃ component composition is Se component composition in 0.667 wt% 33
140 ppm CoO composition in ppm and dominant wavelength 448.13
nm.

Further, dark gray infrared absorbing glass described in JP Kokoku 7-29813 are coloring components Fe ₂ O ₃ -Se-CoO-based, for example, Fe ₂ O ₃ component composition is Se at 1.423 wt% Ingredient composition
At 30 ppm, the CoO composition is 174 ppm and the dominant wavelength is 488.
At 29 nm, the ultraviolet ray transmittance (TSUV) is 8.07%, and for example, the Fe ₂ O ₃ component composition is 1.14 wt%, the Se component composition is 13 ppm, and the C content is 13 ppm.
The composition of oO is 107 ppm, the main wavelength is 485.95 nm, and the ultraviolet ray transmittance (TSUV) is 18.69%. It is not always enough to block ultraviolet rays more. .

Furthermore, for example, in the neutral gray color tone glass described in Japanese Patent Application Laid-Open No. Hei 6-247740 filed by the present applicant, the ultraviolet ray transmittance is, for example, 15%.
Although it is improved to 2525% or 25% or less, depending on the case, further high-performance ultraviolet absorbing ability and heat insulating performance are desired, for example, particularly in an automobile window glass.

[0018]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and has a coloring component of Fe ₂ O ₃ -Se.
Although the -CoO-NiO-Cr ₂ O ₃ system, a combination of various in chemical composition appropriate with any component composition of NiO and Cr ₂ O _3, much better privacy - Performance, ultraviolet absorbing performance and insulation performance (Heat ray absorption performance), especially to block ultraviolet rays B and to further block ultraviolet rays A,
A dark-gray-based glass that can improve livability and safety, and can be reduced in weight in various shapes.
It is able to express the color tone that can be said to be a gray color system of glass, and it can be used sufficiently as window glass for automobiles as well as architectural window glass, and furthermore, as a basic glass composition, it exhibits easy strengthening and weather resistance , It can also have sufficient moldability, enhances livability and safety, and is highly environmentally friendly, of course for buildings that are more friendly to humans and materials,
In particular, the present invention provides a simpler and more efficient ultraviolet-ray-absorbing dark gray glass useful as a window glass for vehicles such as automobiles.

That is, the present invention is based on a soda-lime-silica glass as a basic composition, and as a coloring component, expressed in weight%.
Fe ₂ O ₃ (total iron) is 0.75 to 1.50, and ppm
oO 70-250, Se 10-50, NiO or / and Cr ₂ O ₃
There basically each containing 0-330, plate thickness of the glass is in the illuminant D ₆₅ measured at 3.5 mm, the visible light transmittance Tv
50% or less, the solar transmittance Ts is 45% or less, and the ultraviolet transmittance Tuv is 15% or less, and the ultraviolet transmittance Tuv _{350 at a} wavelength of 350 nm is 8% or less and the ultraviolet transmittance Tuv _{370 at a} wavelength of 370 nm is 35% or less. A dark gray glass.

Further, the coloring component is represented by weight%,
Fe ₂ O ₃ (total iron) is in the 0.75 to 1.00 and ppm display, CoO
70-110, Se 12-35, NiO or / and Cr ₂ O ₃
Basically each containing at least one a 0-120, plate thickness of the glass is in the illuminant D ₆₅ measured at 3.5 mm, the visible light transmittance Tv of 45% or less than 30%, a solar radiation transmittance Ts
Is 40% or less, 20% or more, and UV transmittance Tuv is 14% or less, and UV transmittance Tuv _{350 at a} wavelength of 350 nm is 7%.
% Or less and an ultraviolet transmittance Tuv _{3 70} at a wavelength of 370nm is 33
% Or less, the dark-colored gray glass described above.

Further, the coloring component is represented by weight%,
Fe ₂ O ₃ (total iron) 0.90 to 1.50 and ppm, CoO 1
40~250, Se15~45, NiO and / or Cr ₂ O ₃ 0 to 320
Basically each containing at least one A is the plate thickness of the glass is in the illuminant D ₆₅ measured at 3.5 mm, the visible light transmittance Tv of 29% or less than 10%, a solar radiation transmittance Ts is 25% or less
The dark color as described above, wherein the UV transmittance Tuv is 10% or less and the UV transmittance Tuv _{350 at a} wavelength of 350 nm is 3% or less and the UV transmittance Tuv _{370 at a} wavelength of 370 nm is 25% or less. Gray glass.

Further, the coloring component is represented by% by weight,
Fe ₂ O ₃ (total iron) 0.8 to 1.4 and ppm
00-250, basically each containing Se20～50, plate thickness of the glass is in the illuminant D ₆₅ measured at 3.5 mm, the visible light transmittance Tv of 27% or less than 10%, a solar radiation transmittance Ts 25% Less than 10%
Above and UV transmittance Tuv is 10% or less, and wavelength
UV transmittance at 350nm Tuv ₃₅₀ is less than 3% and wavelength
The dark-gray based glass described above, wherein the UV transmittance Tuv _{370 at 370} nm is 25% or less.

Further, the above-mentioned dark gray glass is characterized in that the reduction ratio (Fe ²⁺ / Fe ³⁺ ) of the dark gray glass is 0.35 or more and 0.55 or less. Also,
Transmission Ts at a wavelength of 1100 nm of the dark-gray based glass
₁₁₀₀ is the above-mentioned dark gray glass, wherein the glass has a thickness of 3.5 mm and a _D65 light source measurement of 20% or less.

Further, the dominant wavelength of the dark gray type glass is 5 mm when measured with a _D65 light source when the thickness of the glass is 3.5 mm.
The dark-gray based glass described above, which has a thickness of 60 nm or more and 590 nm or less.

Further, the basic composition of the soda-lime-silica glass is expressed in terms of% by weight as SiO ₂ 67-75, Al ₂ O ₃ 0.05-
3.0, CaO 7 ~11, MgO 2 ~4.5, ZnO 0 ~0.1, Na 2 O
11.5-16, K ₂ O 0.5-3.0, SO ₃ 0.05-0.4, and SiO ₂
+ Al ₂ O ₃ + TiO ₂ 68-74, CaO + Mg0 + ZnO 11-15, Na ₂ O
+ K ₂ O 12 to 17, which is basically a sheet glass composition, characterized in that it is a dark-colored glass.

Still further, the present invention provides the above-mentioned dark gray glass characterized by using a selenium frit or zinc selenite as a raw material for preparing the Se component.

[0027]

DETAILED DESCRIPTION OF THE INVENTION Here, Fe ₂ O ₃ (total iron) is 0.75 to 1.50 and ppm
In the display, CoO is 70-250, Se is 10-50, NiO or /
And Cr ₂ O ₃ are basically made to contain 0 to 330, respectively, because CeO ₂ which has an excellent ultraviolet absorbing action is
Including a relatively large amount of the composition of TiO ₂ in glass,
Each component composition of Fe ₂ O ₃ and CeO ₂ and TiO ₂ for ultraviolet absorption,
In addition, the high-performance ultraviolet-infrared absorbing green-based glass, which basically balances the composition of FeO for infrared absorption, has the same ultraviolet and infrared absorption performance as the green glass, and the composition of each component of CeO ₂ and TiO ₂ This is because it is necessary to reduce the visible light transmittance and maintain the color tone in a relatively deep gray-color system while maintaining it without using it.

In addition, Fe_TwoO_Three0.75 to 1.50% by weight (total iron)
The reason is that the operating conditions of the actual kiln, for example, the reduction rate (0.35-0.
50) Relatively mild molten strip without drastically changing etc.
Need to take into account that
Adjust the darkness of the dark color
Fe that produces a blue-tinged system if it has infrared absorption performance
Heat ray absorption performance and composition
Fe that produces a yellowish color _TwoO_Three UV absorption by component composition
In both of the Noh and the glass, have a good balance at the same time
Fe required to satisfy the desired optical properties
_TwoO_Three(Total iron).

Also, in ppm, CoO is 70-250,
10 to 50, and NiO or Cr ₂ O _{3 as 0} to 330, of which
CoO and Se are essential component compositions and NiO or Cr ₂ O ₃ is appropriately combined as an optional component composition and the range of the addition amount is, for example, the color tone is expressed only by Fe ₂ O ₃ component composition. In the green color system, the desired dark color tone that the transmittance in the visible region decreases in the green color system does not occur, and for the CoO component composition, the transmittance in the long wavelength side of the visible region is determined, and the dark gray color tone Of the transmittance curve in the visible region, which is necessary for
And the composition of the Se component of Cr ₂ O ₃ .

That is, Fe which provides a dark gray-based color tone
₂ O _3, CoO, each composition of NiO and Cr ₂ O ₃ with respect to component composition systems Se is adjuvant existence, dark gray - in system color is generally of NiO and Cr ₂ O ₃ Reduce each component composition,
It is better to increase the component composition of Se, but if it is too large, it tends to show a bronze system, and if it is too small, it tends to show a green system. For example, iron (yellow, blue), selenium (which combines with iron,
It is appropriately adjusted while expressing brown (brown, pink), cobalt (blue), nickel (green-brown to yellow-brown), and chromium (light green, yellow-blue).

[0031] by coloring components and the composition range as described above, to flatten the transmittance in the visible range, the visible light transmittance was held to a degree of about 50% or less illuminant D ₆₅ at a thickness of about 3.5mm glass Demonstrate and maintain a stable dark gray color tone while maintaining excellent privacy and protection.
Moreover, the intended heat ray absorption performance and ultraviolet absorption performance, in particular, it is possible to have a function of blocking ultraviolet B and blocking ultraviolet A more, and by maintaining and maintaining the above-mentioned optical characteristics, enhancing livability and safety, It is gentle to humans and materials and can realize high environmental properties.

Preferably, Fe ₂ O ₃ (total iron) is 0.77 to 1.4.
5, and ppm, CoO is 75 to 245, Se is 10 to 4
8, NiO and / or Cr ₂ O ₃ is 0 to 320. It should be noted that MnO, SnO ₂ , V ₂
Needless to say, an extremely small amount of an impurity component is contained as an optional component such as each component of O ₅ , CeO ₂ , and TiO ₂ , and if it is a very small amount, there is no particular problem. For example, the preferable range of these trace components is about 0.1% by weight or less in total, more preferably about 0.05% by weight or less,
Optimally, the content is about 0.03% by weight or less or several tens ppm or less.

Further, in the plate thickness of the glass illuminant D ₆₅ measured at 3.5 mm, the visible light transmittance Tv of 50% or less, solar transmittance
The reason that the Ts is 45% or less and the UV transmittance Tuv is 15% or less, and the UV transmittance Tuv _{350 at a} wavelength of 350 nm is 8% or less and the UV transmittance Tuv _{370 at a} wavelength of 370 nm is 35% or less are as follows. Privacy-as a protective glass is less transparent, and heat ray absorption performance and ultraviolet absorption performance is much better than conventional products, for example, to enhance the cooling and heating effect and enhance the comfort in cars and indoors,
For example, it is intended to reduce human and physical adverse effects such as decolorization / deterioration or skin burn due to ultraviolet rays, and to make the products environmentally friendly to vehicles and outdoors.

Moreover, since the 350 nm wavelength transmittance Tuv ₃₅₀ is 8% or less and the 370 nm wavelength transmittance Tuv ₃₇₀ is 35% or less, ultraviolet rays having a wavelength of about 290 to 320 nm out of ultraviolet rays (UV
B) of course is set to zero, for example, to prevent so-called sunburn, which causes human skin to heat red or swollen, blister, and then darken, and reduce the UVA (UVA) having a wavelength of about 320 to 400 nm to a value smaller than the conventional value. Thus, for example, a strong ultraviolet ray having a strong penetrating power into human skin damages fibrous materials such as collagen fibers and elastic fibers in the dermis of the skin, causing wrinkles and lumps, and is present in the skin. This is to prevent the action on melanin to worsen spots and freckles.

Preferably, the visible light transmittance at a thickness of 3.5 mm
The Tv is about 45% or less, the solar transmittance Ts is about 40% or less, and the UV transmittance Tuv is about 14% or less. The UV transmittance Tuv ₃₅₀ at a wavelength of 350 nm is 7% or less and the UV transmittance Tuv _{370 at a} wavelength of 370 nm is TUV _370. 33% or less.

In particular, the coloring component is expressed by weight%, Fe ₂ O ₃ (total iron) is expressed by 0.75 to 1.00 and ppm,
CoO 70-110, Se 12-35, NiO or / and Cr ₂ O
₃ basically contain respectively at least one a 0-120, plate thickness of the glass is in the illuminant D ₆₅ measured at 3.5 mm, the visible light transmittance Tv of 45% or less than 30%, a solar radiation transmittance
Ts is 40% or less 20% or more and UV transmittance Tuv is 14%
The UV transmittance Tuv _{350 at a} wavelength of 350 nm is 7% or less and the UV transmittance Tuv _{370 at a} wavelength of 370 nm is less than 7%.
33% or less.

The coloring component is expressed by weight%, and Fe ₂
O ₃ in the (total iron) 0.90 to 1.50, as well as ppm display, CoO 140~2
50, Se15~45, basically each containing at least one a NiO and / or Cr ₂ O ₃ 0~320, plate thickness of the glass is in the illuminant D ₆₅ measured at 3.5 mm, the visible light transmittance Tv is 29% or less 10% or more, solar transmittance Ts is 25% or less 10%
Above and UV transmittance Tuv is 10% or less, and wavelength
UV transmittance at 350nm Tuv ₃₅₀ is less than 3% and wavelength
UV transmittance Tuv _{370 at 370} nm is 25% or less.

Further, the coloring component is expressed by weight%, and Fe ₂
O ₃ (total iron) 0.8 to 1.4 and ppm, CoO 200 to 2
50, basically each containing Se20～50, plate thickness of the glass is in the illuminant D ₆₅ measured at 3.5 mm, the visible light transmittance Tv
Is 27% or less, 10% or more, solar transmittance Ts is 25% or less, 10% or more, and ultraviolet transmittance Tuv is 10% or less, and the wavelength is 350n.
UV transmittance Tuv _{350 at} m 3% or less and wavelength 370n
The UV transmittance Tuv _{370 at} m 2 is 25% or less.

The reason why the reduction ratio (Fe ²⁺ / Fe ³⁺ ) of the dark-colored gray glass is 0.35 or more and 0.55 or less is that the above-mentioned colorant components and the specified amount thereof are The uniformity is high and the unevenness of color is not developed without changing the melting conditions for converting the glass raw material into glass as much as possible. This is because the optical characteristics can be obtained, and the color tone and the like can be stabilized without change in the plate making process such as a float process and the heat treatment process of tempered glass or bent glass. Preferably
It is 0.37 or more and 0.54 or less. Adjustment of the reduction rate
The operation is performed by a furnace such as bon, sodium sulfate, and the combustion state.

In some cases, for example, oxygen gas or a mixed gas containing oxygen gas, air or combustion exhaust gas with an increased oxygen gas concentration, or a composite gas thereof may be introduced into the atmosphere in the adjustment region of the glass melting furnace. It contributes to color tone stability.

Further, the wavelength of the dark-colored gray glass is 1100.
The transmittance Ts at nm is ₁₁₀₀ , and the thickness of the glass is 3.5 mm.
In the measurement of the _D65 light source, the reason why it is set to 20% or less is to further enhance the heat ray absorbing performance. This is to make the target and environment much more friendly.

Further, the dominant wavelength of the dark-gray based glass is 5 mm when measured with a _D65 light source when the thickness of the glass is 3.5 mm.
It is preferable that the thickness be 60 nm or more and 590 nm or less from the viewpoint of color tone and the like.

Further, the basic composition of the soda-lime-silica glass is expressed in terms of% by weight as SiO ₂ 67-75, Al ₂ O ₃ 0.05-
3.0, CaO 7 ~11, MgO2~4.5, ZnO 0 ~0.1, Na 2 O1
_{1.5~16, K 2 O 0.5 ~3.0,} SO 3 0.05 ~0.4, and SiO ₂
+ Al ₂ O ₃ + TiO ₂ 68-74, CaO + Mg0 11-15, Na ₂ O + K ₂ O
Basically, the glass sheet composition is 12 to 17. The reason why the SiO ₂ component is 67 to 75 by weight% is that if it is less than 67, the surface is liable to burn and the weather resistance is reduced, so that it is practically used. The above problem arises. If it exceeds 75, its reinforceability is lowered and its melting becomes difficult. The reason why the Al ₂ O ₃ component is 0.05 to 3.0 by weight% is that if it is less than 0.05, Practical problems occur due to the occurrence of burns and the like on the surface with reduced weather resistance, preferably 1.0 or more,
If it exceeds 3.0, devitrification is likely to occur, and the molding temperature range becomes narrow, making production difficult.
The reason why it is 7 to 11 is that if it is less than 7, the easy strengthening property will decrease, the flux will be insufficient and the melting temperature will be high, and the flow temperature will not be lowered, so it will be difficult to manufacture, and if it exceeds 11, it will be easy to devitrify. The reason for this is that the range of molding work becomes narrow and production becomes difficult, and the reason why the MgO component is set to 2 to 4.5 by weight is that if it is less than 2, the melting temperature will increase and the operation range will be narrowed, making it difficult to manufacture. If it exceeds, the easy strengthening property is reduced. The reason that the ZnO component is set to 0 to 0.1 in terms of% by weight is to improve the physical properties of the glass by entering from raw materials such as Se and impurities, and is preferably about 0 to 0.05.

Further, the reason why the Na ₂ O component is 11.5 to 16% by weight is that if it is less than 11.5, the easy strengthening property is reduced, the moldability becomes difficult, and the devitrification easily occurs, so that the operation range is narrowed and the production is difficult. If it exceeds 16, the weather resistance will decrease, and burns will easily occur on the surface, causing a practical problem. Therefore, the K ₂ O component of 0.5 to 3.0 by weight% is 0.5 to 3.0.
Easy reinforcing lowers less than are those made higher weather resistance is lowered and the cost exceeds 3.0, was a 0.05 to 0.4 the SO ₃ component in weight percent, defoaming for example in a typical melt below 0.05 Alternatively, it can be performed only to the extent that it is likely to be insufficient in terms of homogeneity, preferably about 0.2 or more, and if it exceeds 0.4, it particularly affects the coloring state of glass, for example, it tends to shift to yellow or amber tint This is because it is difficult to obtain the desired dark gray-based color tone, and it is preferably about 0.35 or less.

Further, the reason why the weight percentage of SiO ₂ + Al ₂ O ₃ + TiO ₂ is 68-74% is that if it is less than 68%, the weather resistance is reduced,
If it exceeds 74%, there is a problem that the reinforceability is reduced. CaO + MgO is 11-15% by weight in terms of Ca
O and MgO components are used to lower the melting temperature, and if it is less than 11%, the easiness to strengthen is reduced, and if it exceeds 15%, the glass tends to be devitrified and becomes difficult to produce.
The the ₂ O + K ₂ O was 12 to 17% by weight percentages, easy reinforcing lowers less than 12%, devitrification is working temperature range is narrow in the molding tends to occur, manufacture becomes difficult, 17
%, The weather resistance is reduced and a practical problem is caused, and the cost is also increased.

The reason for using a selenium-based frit or zinc selenite as a raw material for preparing the Se component is that metal selenium has a low residual ratio in glass and is not economical. The residual ratio of zinc selenite (ZnSeO ₃ ) is expected to be about twice the residual ratio of the selenium-based frit, and it is preferable to use zinc selenite as a raw material.

It is preferable in terms of production and quality that the density of the glass be as close as possible to the density of the glass component composition produced by the conventional float method.

Further, the dark gray glass of the present invention is an easily strengthened glass composition, and is a thin glass having a thickness of about 1 mm to a thick glass having a thickness of about 10 mm. It is used for single pane glass, laminated glass, laminated glass or multi-layer glass, glass with these various functional films, etc. First, it can be used for vehicles, especially for window glasses for automobiles, and is useful.

As described above, the dark gray-based glass of the present invention is a colored glass having a dark gray-based color tone in which a specified colorant component is combined in a specified composition range with soda lime silica glass as a basic glass composition. In addition, the base glass composition can be easily strengthened, and the reduction ratio of the glass can be adjusted. Within the above-described colorant components and the quantitative ranges thereof, the desired optical characteristics described above can be obtained. ,
That is, the visible light transmittance Tv is 3.5 mm in thickness and 50% with _D65 light source.
Below, the solar transmittance Ts is 45% or less and the ultraviolet transmittance Tu
v is not more than 15%, in particular, 350 nm wavelength transmittance Tuv ₃₅₀ is about 8% or less, and 370 nm wavelength transmittance Tuv ₃₇₀ is about 35% or less. Considering the weather resistance, moldability, devitrification, cost, etc., except for the oxidation state, the manufacturing conditions and the properties of the glass in the conventional glass melting furnace are hardly changed,
In addition, it is easy to strengthen and has good physical and physical comfort to enhance livability. It has excellent low visibility and low glare, excellent privacy protection and ultraviolet rays B. And high security such as shielding of ultraviolet rays A, and with a dark gray color tone that is well harmony with, for example, cars and indoors, it is environmentally friendly and excellent. It is easy to obtain a sufficient degree of strengthening or sufficient strength even with thin colored glass, etc., which could not be obtained by the heat strengthening method of (1). The present invention can provide a dark gray glass useful for window glass for vehicles, ships, aircrafts, etc., such as window glasses.

[0050]

Embodiments of the present invention will be described below. Example 1 As raw materials for glass, for example, silica sand, feldspar, soda ash, dolomite, limestone, sodium sulfate, red iron oxide, or ilmenite, and selenium-based frit (SiO ₂ —Al ₂ O ₃ —Fe ₂ O ₃ —RO—
R ₂ O-Se-based, SiO ₂ -Al ₂ O ₃ -Fe ₂ O ₃ -RO-R ₂ O-Se-NiO-based), cobalt oxide, nickel oxide, etc. together so that the colorant composition in the component range, for example, the viscosity temperature is 10 ⁹ poise 650
～685 ° C. approximately, 555 to 590 ° C. of about 10 ¹² poise, and set the glass composition temperature difference therebetween comes to be about 95 to 105 ° C. As a target composition, weighed formulated the target composition weight, small In an electric melting furnace, for example, a considerable amount of carbon is used as a reducing agent (for example, about 0.05 to 0.055% for 100 g of glass), and a considerable amount of sodium sulfate is used as a fining agent, for example, a ratio of silica to sand is about 0.5%. Use, adjust the reduction rate and ensure enough while melting at about 1400-1450 ° C for about 3-4 hours, homogenize and clarify, etc. Slow cooling, thickness about 3.
It was optically polished to about 5 mm to obtain a glass plate having a size of 100 mm × 100 mm to obtain a dark gray glass for glass component composition analysis and measurement of various optical characteristics. Needless to say, the composition may be appropriately used in consideration of the composition, optical properties, quality, and the like of various cullets. Hereinafter, the same applies to each embodiment.

With respect to the obtained dark gray glass,
When confirmed by wet analysis based on JIS R-3101, etc.
SiO in amount% display_Two70.8%, Al_TwoO_Three1.95, CaO9.15, MgO3.
5, Na _TwoO13.45, K_TwoO0.91, SO_Three0.2 base glass composition
As shown in Table 1, the colorant is Fe% by weight._TwoO_Three (all
Iron) 0.948, Se15.5, CoO80.0, NiO110.0 in ppm
And the sum of the components is about 99.981%,_Two+
Al_TwoO_Three72.75%, CaO + MgO 12.65%, Na_TwoO + K_TwoO 14.3
6%. Glass using selenium frit
The residual ratio of Se in the sample was about 14.1%. Note that impurities
Analysis of trace component composition of ppm order coming from etc.
Did not. Hereinafter, the same applies to each embodiment.

[0052] Further, for the reduction ratio (Fe ²⁺ / Fe ^3+), the spectral transmittance curve by illuminant D ₆₅ at the plate thickness 3.5 mm as shown in FIG. 1 (measurement by measuring instrument to be described later), red FeO amount Determined from the transmittance Ts ₁₁₀₀ at an external wavelength of about 1.1 μm (1100 nm), the value is 0.248% by weight. The total iron content (Fe ₂ O ₃ ) of the analytical value described above is calculated from 0.948% by weight, and the reduction rate is calculated. Was 0.41.

[0053] Furthermore, in the optical characteristics (D ₆₅ light source, 3.
Visible light transmittance Tv (at 5 mm thickness) [%, wavelength 0.38 to 0.78 μm (380 to 780 nm)], UV transmittance
Tuv [%, wavelength 0.30-0.38μm (300-380nm), ISO
(According to the International Organization for Standardization)] and a wavelength of 0.35 μm (3
Transmittance at 50nm) Tuv ₃₅₀ (%) and wavelength 0.35
μm (370 nm) transmittance Tuv ₃₇₀ (%) and solar transmittance Ts [%, wavelength 0.34 to 1.8 μm (340 to 1800 n
m)] and transmittance Ts at a wavelength of 1100 nm
_{For 1100} (%), dominant wavelength λd (nm), stimulus purity Pe (%), etc., use a 340 type self-recording spectrophotometer (manufactured by Hitachi, Ltd.) and JIS.
Measurement and calculation were performed using Z-8722, JIS R-3106, and ISO / DIS-9050.

As a result, as shown in Table 2, the visible light transmittance Tv is about 38.7%, the solar transmittance Ts is about 29.2%, and the wavelength
1100nm transmittance Ts ₁₁₀₀ is about 14.8%, UV transmittance Tuv is
About 9.1%, 350nm wavelength Tuv ₃₅₀ is about 3.3%, 370nm wavelength Tuv ₃₇₀ is about 24.5%, and main wavelength λd is 570.
About 4nm, Stimulation purity Pe is about 9.3%, and it shows remarkably excellent privacy performance and ultraviolet and infrared absorption performance.
It was the intended dark gray glass.

Further, with respect to the ease of strengthening, after confirming that the above-mentioned glass clears the above-mentioned viscosity temperature within a predetermined range, the above-mentioned glass was placed in a furnace at an ambient temperature of about 650 to 730 ° C. After heating for about 5 minutes in the oven, normal air-cooling was performed to obtain a tempered glass sheet.
When examined according to R-3211, with high efficiency and high yield,
It was a dark-colored gray glass having easy strengthening that sufficiently satisfies the specified specifications.

Example 2 In the same manner as in Example 1 above, the glass composition was calculated so as to obtain the expected dark gray glass, weighed and blended, and the resulting glass was melted. Sampled.

As a result of analyzing, measuring, and evaluating the obtained sample in the same manner as in Example 1, the analysis value of the basic glass component composition was almost the same as that of Example 1, and each colorant component composition or reduction ratio, Se Is as shown in Table 1, and the respective optical characteristics are as shown in Table 2. As in the case of Example 1, the desired dark gray color tone was obtained and the privacy was excellent. -It is a dark-gray-based glass that is expected to have performance and ultraviolet and infrared absorption performance.

Further, with respect to the ease of reinforcement, the first embodiment
As a result, the same results as in Example 1 were obtained. Examples 3-4 Same as Example 1 except that selenium frit was replaced by zinc selenite (SeZnO ₃ ) and chromium oxide was replaced by nickel oxide and mainly nickel oxide was traced. The glass composition was calculated and weighed to obtain the desired dark gray glass, and the glass was melted and sampled similarly.

As a result of analyzing, measuring, and evaluating the obtained sample in the same manner as in Example 1, the analyzed values of the basic glass component composition were almost the same as those of Example 1 even though the ZnO component composition contained about 0.02 wt%. The composition of each colorant, the reduction ratio, and the residual ratio of Se are as shown in Table 1, and the optical characteristics are as shown in Table 2 (the spectral transmittance curve of Example 4 is shown in FIG. 1). ), Especially the stimulus purity Pe is about 5.6
% And about 5.9%, as in the case of Example 1, which has the desired dark gray color tone, and has extremely excellent privacy performance and ultraviolet and infrared absorption performance. It was a color gray glass. Furthermore, the residual ratio of Se is about 20.1%
And about 23.8%, and Se in the use of selenium frit
About 1.3 to 1.7 times the residual rate of

Further, as to the ease of strengthening, the above-mentioned Example 1 was used.
It was the same as. Examples 5-6 Except for using chromium oxide in place of nickel oxide, in the same manner as in Example 1 above, the glass composition was calculated and weighed to obtain the desired dark gray glass. A melting operation was performed, and the obtained glass was similarly sampled.

As a result of analyzing, measuring, and evaluating the obtained sample in the same manner as in Example 1, the analysis value of the basic glass component composition was almost the same as that in Example 1, and each colorant component composition or reduction ratio, Is as shown in Table 1, and the glass is obtained by increasing the respective component compositions of Se, CoO, and Cr ₂ O ₃ , and the optical characteristics are as shown in Table 2 (Example 5 is FIG. FIG. 2 shows a spectral transmittance curve of Example 6), a visible light transmittance Tv of about 23.9% and 22.9%, a solar transmittance Ts of about 23.7% and 21.5%, and a wavelength 1100 nm transmittance Ts _1100. 16.4% and 13.4%, UV transmittance Tuv
6.0% and 5.8%, wavelength 350nm, transmittance Tuv ₃₅₀ 1.6%
And about 1.4%, wavelength 370nm transmittance Tuv ₃₇₀ is 17.3% and 16.3
%, Dominant wavelength λd is about 570.9 nm and 570.6 nm, stimulus purity Pe is about 10.3% and 10.0%, and it is the expected dark gray color tone, with outstandingly excellent privacy performance and ultraviolet and infrared rays. It was the intended dark-gray glass with the desired absorption properties.

Further, with respect to the ease of reinforcement, the first embodiment
It was the same as. Examples 7 and 9 In the same manner as in Example 1 except that zinc selenite (SeZnO ₃ ) was used instead of the selenium frit, the glass composition was calculated so as to obtain the desired dark gray glass. Then, the mixture was weighed, melted, and the obtained glass was similarly sampled.

The obtained sample was the same as in Example 1
Analysis, measurement and evaluation results, the basic glass component composition
The analytical values of both indicate that the ZnO component composition contained about 0.03-0.04 wt%.
And the composition of each colorant was substantially the same as in Example 1.
Alternatively, the reduction ratio and the residual ratio of Se are as shown in Table 1.
, Fe_TwoO_Three, CoO, NiO
The residual ratio of Se is about 29% and about 23.7% with selenium frit.
About 1.5 to 2.1 times the residual ratio of Se in
Table 2 shows the optical characteristics (Examples 7 and 9).
Are shown in FIG. 3).
The visible light transmittance Tv is 16.6% and about 15.8%, and the solar transmittance Ts is
13.1% and 14.3%, wavelength 1100nm transmittance Ts ₁₁₀₀4.8%
And 6.6%, UV transmittance Tuv is about 2.5% and 2.7%
Degree, wavelength 350nm Transmittance Tuv₃₅₀About 0.1% and 0.2%, wave
Long 370nm transmittance Tuv₃₇₀7.7% and 8.2%
Excellent grade and expected dark gray color tone.
Excellent privacy performance and UV / IR absorption performance
It was the intended dark-gray-based glass.

Further, with respect to the ease of strengthening, the first embodiment
It was the same as. Examples 8 and 11 The intended dark gray system was prepared in the same manner as in Example 1 except that zinc selenite (SeZnO ₃ ) was used instead of selenium frit and chromium oxide was used instead of nickel oxide. The glass composition was calculated to be a glass, weighed and prepared, melted, and the obtained glass was similarly sampled.

As a result of analyzing, measuring and evaluating the obtained sample in the same manner as in Example 1, the analysis values of the basic glass component composition were almost the same as those in Example 1 although the ZnO component composition contained about 0.03 wt%. And the composition or reduction ratio of each colorant and the residual ratio of Se are as shown in Table 1, and Fe ₂ O ₃ ,
Se, CoO, Cr ₂ O ₃
Is about 36.9% and about 27.0%, which is about 1.7 to 2.6 times that of Se when selenium frit is used, and the optical characteristics are as shown in Table 2 (the spectral transmittance curve of Example 8). Is shown in FIG. 4), especially when the visible light transmittance Tv is 1
6.8% and 13.9%, solar transmittance Ts is 12.6% and 11.O%, wavelength 1100nm transmittance Ts ₁₁₀₀ is 6.6% and 3.5%, ultraviolet transmittance Tuv is 2.1% and 2.4%, wavelength 350nm Transmission Tuv ₃₅₀ is 0.0% and 0.0%, wavelength 370nm Transmittance Tuv
₃₇₀ is 6.5% and 6.6%, which is much better, with the expected dark gray color tone and much better privacy.
It was the intended dark-gray glass with the desired performance and ultraviolet and infrared absorption performance.

Further, with respect to the ease of reinforcement, the first embodiment
It was the same as. Example 10 In the same manner as in Example 1 except that zinc selenite (SeZnO ₃ ) was used instead of selenium frit, and chromium oxide was mainly used instead of nickel oxide, and a small amount of nickel oxide was used.
The glass composition was calculated and weighed to obtain the desired dark gray glass, and the glass was melted and sampled similarly.

The obtained sample was analyzed, measured and evaluated in the same manner as in Example 1 above. As a result, the analysis value of the basic glass component composition was almost the same as that of Example 1 even though the ZnO component composition contained about 0.03 wt%. The composition of each colorant or the reduction ratio and the residual ratio of Se are as shown in Table 1, and Fe ₂ O ₃ , S
e, CoO, Cr ₂ O ₃ The composition of each component is slightly changed and the content of each component of NiO is very small.
About 1.9 for the residual ratio of Se when using selenium frit
The optical characteristics are as shown in Table 2 (spectral transmittance curves are shown in FIG. 4). In particular, the visible light transmittance Tv is about 14.9%, the solar transmittance Ts is about 12.1%, Wavelength 1100nm transmittance Ts ₁₁₀₀ is about 4.7%, UV transmittance Tuv
Is about 2.2%, wavelength 350nm transmittance Tuv ₃₅₀ is about 0.1%,
Wavelength 370nm Transmittance Tuv ₃₇₀ is much better at about 6.6%, which is the expected dark gray color tone, and has excellent privacy performance and ultraviolet and infrared absorption performance. It was a color gray glass.

Further, with regard to the ease of reinforcement, the first embodiment
It was the same as. Example 12 In the same manner as in Example 1 except that zinc selenite (SeZnO ₃ ) was used instead of selenium frit and nickel oxide and chromium oxide were not used, a desired dark gray glass was obtained. The calculated glass composition was calculated and weighed, melted, and the obtained glass was similarly sampled.

The obtained sample was analyzed, measured and evaluated in the same manner as in Example 1 above. As a result, the analysis value of the basic glass component composition was almost the same as that of Example 1 even though the ZnO component composition contained about 0.03 wt%. The composition of each colorant or the reduction ratio and the residual ratio of Se are as shown in Table 1, and Fe ₂ O ₃ , S
e, The composition ratio of each component of CoO is slightly changed, and the composition ratio of each component of Se and CoO is slightly increased. The residual ratio of Se is about 27.9%, which is about 1.7 to 2.0 times the residual rate of Se when selenium frit is used. The respective optical characteristics are as shown in Table 2 (spectral transmittance curve is shown in FIG. 2), and in particular, the visible light transmittance Tv
About 17.2%, solar transmittance Ts about 16.5%, wavelength 1100nm
Transmittance Ts ₁₁₀₀ is about 8.8%, UV transmittance Tuv is 3.6%
About ₃₅₀ %, transmission wavelength Tuv ₃₅₀ is about 0.4%, wavelength 370n
m transmittance Tuv _{3 70} about 10.6%, an excitation purity Pe is more excellent remarkably about 4.7%, the intended dark gray - a system tone, much better privacy - the performance and ultraviolet and infrared radiation absorbing performance It was a dark-gray-based glass that was expected to have.

Further, with respect to the ease of strengthening, the first embodiment
It was the same as.

[0071]

[Table 1]

[0072]

[Table 2]

[0073]

According to the present invention, the specified colorant components are skillfully combined within the specified composition range, and the visible light transmittance, the solar transmittance, the ultraviolet transmittance, especially the wavelength of 350 nm and the wavelength of 370 nm are transmitted. By having a dark-gray-based glass with a specified rate, it has sufficient privacy and obtains a glass exhibiting the expected dark-gray-based color tone, and exhibits a significantly superior ultraviolet absorption performance, It shields ultraviolet rays B and ultraviolet rays A more, imparts excellent visible light transmittance and solar transmittance in a well-balanced manner, maintains easy strengthening, and drastically changes the operating conditions of the actual kiln. Can be manufactured sufficiently stably, and the glass can further enhance livability and safety in both human and physical aspects, and has high environmental properties and can be reduced in weight. And window glass for construction, etc. Of course, dark gray becomes useful when applied to automotive window glass - is to provide a glass.

[Brief description of the drawings]

FIG. 1 is a diagram showing a dark color group in Examples 1, 4 and 5 of the present invention.
D with 3.5mm thickness of glass ₆₅Spectral transmittance by light source
It is a curve.

FIG. 2 shows dark gray in Examples 6 and 12 of the present invention.
It is a spectral transmittance curve by illuminant D ₆₅ at a thickness 3.5 mm of the system glass.

FIG. 3 shows dark gray in Examples 7 and 9 of the present invention.
It is a spectral transmittance curve by illuminant D ₆₅ at a thickness 3.5 mm of the system glass.

FIG. 4 shows dark gray in Examples 8 and 10 of the present invention.
It is a spectral transmittance curve by illuminant D ₆₅ at a thickness 3.5 mm of the system glass.

Claims (9)

[Claims] 1. A soda-lime-silica-based glass having a basic composition and a coloring component of Fe ₂ O ₃ (total iron) of 0.1% by weight.
75 to 1.50, and 70 to 250 CoO in ppm, Se
But 10 to 50, NiO and / or Cr ₂ O ₃ is basically each containing 0-330, plate thickness of the glass is in the illuminant D ₆₅ measured at 3.5 mm, the visible light transmittance Tv of 50% or less, The solar transmittance Ts is 45% or less and the UV transmittance Tuv is 15% or less,
In addition, a dark gray glass having a UV transmittance Tuv _{350 at a} wavelength of 350 nm of 8% or less and a UV transmittance Tuv _{370 at a} wavelength of 370 nm of 35% or less. In wherein said coloring component weight percentages, Fe ₂ O
₃ (Total iron) is 0.75-1.00 and ppm, CoO is 70
To 110, Se is 12 to 35, NiO and / or Cr ₂ O ₃ 0 to 1
20 and essentially contains at least one of each, and the glass has a thickness of 3.5 mm and a D ₆₅ light source measurement,
Visible light transmittance Tv is 45% or less 30% or more, solar radiation transmittance Ts is 40
20% or more and UV transmittance Tuv is 14% or less,
2. The dark gray glass according to claim 1, wherein the UV transmittance Tuv _{350 at a} wavelength of 350 nm is 7% or less and the UV transmittance Tuv _{370 at a} wavelength of 370 nm is 33% or less. 3. The method according to claim ₂ , wherein the coloring component is expressed by weight%,
₃ (Total iron) 0.90-1.50 and ppm, CoO 140-2
50, Se15~45, basically each containing at least one a NiO and / or Cr ₂ O ₃ 0~320, plate thickness of the glass is in the illuminant D ₆₅ measured at 3.5 mm, the visible light transmittance Tv is 29% or less 10% or more, solar transmittance Ts is 25% or less 10%
Above and UV transmittance Tuv is 10% or less, and wavelength
UV transmittance at 350nm Tuv ₃₅₀ is less than 3% and wavelength
2. The dark gray glass according to claim 1, wherein the ultraviolet ray transmittance Tuv _{370 at 370} nm is 25% or less. In wherein said coloring component weight percentages, Fe ₂ O
₃ (total iron) 0.8 to 1.4 and ppm, CoO 200 to 2
50, basically each containing Se20～50, plate thickness of the glass is in the illuminant D ₆₅ measured at 3.5 mm, the visible light transmittance Tv
Is 27% or less, 10% or more, solar transmittance Ts is 25% or less, 10% or more, and ultraviolet transmittance Tuv is 10% or less, and the wavelength is 350n.
UV transmittance Tuv _{350 at} m 3% or less and wavelength 370n
The dark gray glass according to claim 1, wherein the UV transmittance Tuv _{370 at} m 2 is 25% or less. 5. The reduction rate of the dark gray glass (Fe ²⁺
5. The dark gray glass according to claim 1, wherein / Fe ³⁺ ) is 0.35 or more and 0.55 or less. 6. The transmittance Ts _{1100 at} a wavelength of 1100 nm of the dark-gray based glass is D ₆₅ when the glass thickness is 3.5 mm.
The dark gray glass according to any one of claims 1 to 5, wherein the light source measurement is 20% or less. Wherein said dark gray - dominant wavelength based glass, plate thickness of the glass is in the illuminant D ₆₅ measured at 3.5 mm, 560 nm
7 to 590 nm or less.
The dark-gray-based glass as described. 8. The base composition of the soda-lime-silica-based glass is expressed as SiO ₂ 67-75, Al ₂ O ₃ 0.05-3.0, by weight%.
CaO 7 ~11, MgO 2 ~4.5, ZnO 0 ~0.1, Na 2 O11.5~
_{16, K 2 O 0.5 ~3.0,} SO 3 0.05 ~0.4, and SiO ₂ + Al ₂ O
_{3 + TiO 2 68~74, CaO +} Mg0 + ZnO 11~15, Na 2 O + K 2 O 1
The dark gray glass according to any one of claims 1 to 7, wherein the glass glass composition is 2 to 17 basically. 9. The dark gray glass according to claim 1, wherein a selenium frit or zinc selenite is used as a raw material for preparing the Se component.