JP2002087843A - Low melting point glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low melting point glass exhibiting high transmittance at the time of being used as electrode coating and hardly causing silver colloid coloring. SOLUTION: The low melting point glass has <=650 deg.C softening point and <=90×10-7/ deg.C average linear expansion coefficient, contains B2O3, SiO2 and CuO and the content of B2O3, SiO2 and CuO are respectively >=11%, >=5% and 0.1-1% expressed by percentage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-melting glass suitable for insulatingly coating silver-containing electrodes, transparent electrodes, etc. in a plasma display panel or the like.

[0002]

2. Description of the Related Art In recent years, a plasma display panel (hereinafter, referred to as a PDP) has attracted attention as a thin and large flat panel color display device. In a PDP, typically, a cell is defined by a front substrate, a rear substrate, and a partition used as a display surface, and an image is formed by generating a plasma discharge in the cell,
An electrode is formed on each pixel to control the display state of the pixel forming the image.

In order to prevent the image quality, that is, the image quality from being deteriorated, a transparent electrode is used as the electrode. As the transparent electrode, a thin film of ITO or tin oxide formed on a glass substrate is often used. Here, the tin oxide includes tin oxide doped with fluorine, antimony, or the like. The transparent electrode is processed into a thin line to realize a fine image. A bus electrode is usually formed on the transparent electrode. The bus electrode is an opaque electrode made of a metal such as silver, and is formed in a thinner line than the transparent electrode in order to prevent a deterioration in image quality.

In order to independently control each pixel, it is necessary to ensure mutual insulation between such finely processed “transparent electrodes and bus electrodes formed on the transparent electrodes”. However, when moisture is present on the surface of the glass substrate or when an alkali component is present in the glass substrate, a slight current may flow through the surface of the glass substrate. In order to prevent such a current, it is effective to form an insulating layer between the electrodes.

[0005] In order to prevent the image quality from being deteriorated by the insulating layer formed between the electrodes, it is preferable that the insulating layer is transparent. Further, in order to protect the transparent electrode from plasma, it is preferable that the insulating layer has excellent plasma durability. As an insulating material for forming such an insulating layer, glass that is transparent, has excellent plasma durability, and is a highly reliable insulating material is widely used.

[0006]

The glass used for such electrode coating is usually used in the form of glass powder. That is, if necessary, a filler or the like is added to the glass powder to form a paste, and the glass paste thus obtained is applied to a glass substrate on which the electrode is formed and fired to cover the electrode.

Such an electrode coating glass has a softening point of, for example, 650 ° C. or less and an average linear expansion coefficient of, for example, about 80 × 10 ⁻⁷ / ° C. at a temperature of 50 to 350 ° C., in addition to the electrical insulation property. And that the electrode-coated glass layer obtained by firing has high transparency, and the like, and various glasses have been conventionally proposed. For example, JP-A-11-180726, in mass _{percentage, PbO + Bi 2 O 3:} 52~68%, B 2 O 3: 1
_{4~28%, SiO 2: 0~5%} , ZnO: 6~23
_{%, Al 2 O 3: 0~8} %, CeO 2: 0~5%, Sn
O _2: 0~5%, noncrystalline glass consisting essentially is disclosed from.

However, in PDPs, further improvement in image quality has been demanded in recent years, and accordingly, it has been required to further increase the transparency of the electrode-coated glass layer. In addition, a silver electrode is often used as a bus electrode of a PDP. In this case, however, there is a problem that silver diffuses into the electrode coating glass layer and silver colloidal coloration occurs to degrade image quality. An object of the present invention is to provide a low-melting glass that solves these problems.

[0009]

According to the present invention, the softening point is 65.
A low-melting glass having a temperature of 0 ° C. or less and an average coefficient of linear expansion at 50 to 350 ° C. of 90 × 10 ⁻⁷ / ° C. or less, containing B ₂ O ₃ , SiO ₂ and CuO, and expressed as a percentage by mass. , B ₂ O ₃ content of 11% or more, SiO ₂ content of more than 5%, CuO content to provide a low-melting glass, characterized in that from 0.1 to 1%.

The present inventor presumed that one of the causes of the decrease in the transparency of the electrode-coated glass layer in the PDP was the following carbon-containing impurities remaining in the electrode-coated glass layer, leading to the present invention. Was.

The low-melting glass for electrode coating is usually used in powder form. The low-melting glass powder for electrode coating is made into a glass paste using an organic vehicle or the like for imparting printability, and this glass paste is coated on an electrode formed on a glass substrate and fired to coat the electrode. .

The electrode-coated glass layer obtained by firing is often colored brown or black even when it does not contain a coloring component such as a transition metal. This phenomenon is considered to be a phenomenon in which carbon-containing impurities contained in an organic vehicle and the like remain in the electrode-coated glass layer, and the carbon-containing impurities color the electrode-coated glass layer. The brown color typically reduces the transmittance of light having a wavelength of 400 nm.

When the plasma is generated in the PDP, the carbon-containing impurities react with water and the like existing in the electrode-coated glass layer and are released from the electrode-coated glass layer as carbon dioxide gas. It is considered that the brightness also decreases. In addition, the present inventors have found that the silver colloid coloring can be sufficiently suppressed by adding CuO, and have reached the present invention.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The low melting point glass of the present invention (hereinafter simply referred to as the glass of the present invention) is usually used in the form of powder. When the glass powder of the present invention is used for electrode coating, it is usually made into a glass paste using an organic vehicle or the like for imparting printability, and this is applied to an electrode formed on a glass substrate, and baked. To cover the electrodes. Here, the organic vehicle is obtained by dissolving a binder such as ethyl cellulose in an organic solvent such as α-terpineol. In a PDP, the glass of the present invention is suitably used for covering a transparent electrode and a bus electrode on a front substrate. It is particularly preferred when the bus electrode is a silver-containing bus electrode.

The average particle size of the powder is preferably 0.5 μm or more. If it is less than 0.5 μm, the number of air bubbles in the electrode-coated glass layer obtained by firing may increase, and the transparency may decrease, and the time required for forming the powder may significantly increase. More preferably, 0.
7 μm or more.

The maximum particle size of the powder is preferably 35 μm or less. The thickness of the electrode-coated glass layer in the PDP is usually 40 μm or less. However, if the maximum particle size is more than 35 μm, the surface of the electrode-coated glass layer may have irregularities and the image of the PDP may be distorted. The maximum particle size is more preferably 20 μm or less.

The softening point of the glass of the present invention is 650 ° C. or less. The softening point is preferably 450 ° C. or higher. The reason is described below. As the glass substrate,
Usually, those having a glass transition point of 550 to 620 ° C are used. In this case, in order to avoid deformation of the glass substrate, the firing of the glass paste is performed at 620 ° C. or less. If the softening point is higher than 650 ° C., firing at 620 ° C. or lower becomes difficult. Further, in order to prevent the glass of the present invention from softening and flowing at the early stage of the sintering and completely cover the electrode, thereby preventing the electrical characteristics of the electrode from deteriorating during the sintering, the softening point is 650 ° C. or less. Is preferred. The softening point is preferably at most 620 ° C, more preferably at most 620 ° C, particularly preferably at most 590 ° C.

On the other hand, on the front substrate of a PDP, a bus electrode is usually formed on a transparent electrode. The bus electrode is made of a metal such as silver, aluminum, and chromium-copper-chromium having a three-layer structure. If the bus electrode is covered with glass having a softening point of less than 450 ° C., the bus electrode may be eroded or the erosion of the transparent electrode via the bus electrode may be accelerated. In particular, when baking is performed at 520 ° C. or more, when the bus electrode is covered with glass having a softening point of less than 450 ° C., the erosion of the transparent electrode becomes remarkable. In this case, when the bus electrode is coated with glass having a softening point of 450 ° C. or more and less than 520 ° C., the erosion of the transparent electrode is eliminated, but the bubbles in the electrode coated glass layer increase during firing, and the transmittance of the electrode coated glass layer increases. Decrease.

The softening point of the glass of the present invention is more preferably 500 ° C. or higher. It is more preferably 520 ° C or higher, particularly preferably 540 ° C or higher.

If the softening point is 450 ° C. or higher, the organic vehicle in the glass paste is completely volatilized before the softening flow of the glass starts during firing, and carbon-containing impurities in the organic vehicle are transferred to the electrode coating glass layer. Is also expected to prevent the large amount of remaining and the accompanying decrease in the transmittance of the electrode-coated glass layer. Actually, a mixed powder obtained by mixing ethyl cellulose used as a binder which is a constituent component of an organic vehicle and glass powder having a softening point of 600 ° C. and an average particle size of 3 μm in a mortar, When the temperature was raised at 10 ° C. and the relationship between the weight loss rate and the temperature was examined, the weight loss rate became 0 at 450 ° C.

Further, if the softening point is 520 ° C. or higher, the electrode-coated glass layer can have a single-layer structure. On the other hand, if the softening point is less than 520 ° C., it is difficult to form a single layer structure due to the transparent electrode erosion phenomenon, and the glass having a softening point of less than 520 ° C. is an upper layer. There is a possibility that a non-single-layer structure having glass having a high softening point as a lower layer may be required. The lower layer referred to here is a layer directly in contact with the transparent electrode.

The glass substrate is usually 50 to 3
The average coefficient of linear expansion at 50 ° C. is 80 × 10 ^{−7 to} 90 ×
10 ^-7 / ° C is used. Therefore, the average linear expansion coefficient of the glass of the present invention is set to 90 × 10 ⁻⁷ / ° C. or less in order to match the expansion characteristics with such a glass substrate and to prevent warpage and a decrease in strength of the glass substrate.
It is preferably at most 85 × 10 ⁻⁷ / ° C. Further, the average linear expansion coefficient is preferably 60 × 10 ⁻⁷ / ° C. or more. It is more preferably at least 70 × 10 ⁻⁷ / ° C., particularly preferably at least 75 × 10 ⁻⁷ . In addition, 50-350 ° C
In the following, the average linear expansion coefficient is simply referred to as an expansion coefficient.

The temperature of the glass of the present invention is from room temperature to 400 ° C.
Resistivity in the range up to room temperature, more typically from room temperature to 3
The specific resistance in the range up to 00 ° C. is 0.1% of the specific resistance of the glass used for the glass substrate in the temperature range.
It is preferably one or more times. If this condition is not satisfied, the electrical insulation may be insufficient. The specific resistance at 150 ° C. of the glass used for the glass substrate is typically about 10 ¹¹ Ω · cm. From this, the specific resistance of the glass of the present invention at 150 ° C. is 10 ¹⁰ Ω ·
cm or more, and more preferably 10 ¹¹ Ω · cm or more.

The relative permittivity of the glass of the present invention is preferably 12 or less. If it exceeds 12, the capacitance of the cell of the PDP becomes too large, and the power consumption of the PDP may increase. Preferably it is 10.5 or less.

It is preferred that the glass of the present invention does not crystallize during firing. From this viewpoint, the crystallization temperature _Tc of the glass of the present invention is preferably higher than the firing temperature. It is more preferable that the temperature is higher by 80 ° C. or more than the firing temperature. The crystallization temperature mentioned here is a crystallization peak temperature obtained by differential thermal analysis (DTA), and when no crystallization peak is observed, T _c = ∞. The _Tc is preferably 700 ° C. or higher. Below 700 ° C., 50
During firing at 0 to 620 ° C., the glass may crystallize and the transparency may decrease. It is more preferably at least 750 ° C.

Next, the components of the glass of the present invention will be described. The content of each component is described by mass percentage. B ₂ O ₃
Is an essential component, and is contained in an amount of 11% or more for stabilizing the glass or for increasing the fluidity of the glass at the time of firing and reducing the residual bubbles in the electrode-coated glass layer to increase the transmittance. It is preferably at least 20%, more preferably at least 25%. Further, the B ₂ O ₃ content is preferably 60% or less. If it exceeds 60%, the softening point may be too high, the glass may be phase-separated, or the expansion coefficient may be too small. More preferably 50
% Or less, particularly preferably 40% or less. Note that the size of the residual bubbles is typically 30 μm.

SiO ₂ is an essential component, and is used for stabilizing glass or for suppressing silver coloring.
It is contained in 5% or more. The silver color phenomenon here is called PDP
When the silver-containing bus electrode formed on the glass substrate of the front substrate is covered with glass, silver diffuses into the glass to generate silver colloid, and the glass is colored brown, thereby deteriorating the image quality of PDP. is there. It is considered that SiO ₂ has an effect of suppressing the diffusion of the silver. The SiO ₂ content is 4
It is preferably 0% or less. If it exceeds 40%, the fluidity of the glass at the time of firing may decrease, and the residual air bubbles in the electrode-coated glass layer may increase, and the transmittance may decrease. It is more preferably at most 20%, particularly preferably at most 10%.

In order to further suppress the silver coloring phenomenon, it is necessary to use Si
The value obtained by dividing the O ₂ content by the B ₂ O ₃ content SiO ₂ / B
It is preferable that ₂ O ₃ be 0.09 or more. It is more preferably at least 0.15, particularly preferably at least 0.23.

CuO is an essential component, and is contained in an amount of 0.1% or more in order to prevent a decrease in transmittance of the electrode-coated glass layer or to suppress a silver coloring phenomenon. It is preferably at least 0.3%. On the other hand, the CuO content is set to 1% or less in order to prevent the coloring caused by Cu from becoming too deep. Preferably it is 0.9% or less, more preferably 0.7% or less.

The content of CuO referred to in the present specification is
Assuming that all Cu in the glass exists as CuO,
This is the Cu content converted as uO. The same applies to the content of components related to polyvalent elements other than Cu in the present specification.

The glass of the present invention preferably contains at least one selected from the group consisting of PbO, Bi ₂ O ₃ and P ₂ O ₅ . It is particularly preferable to contain PbO.
If none of PbO, Bi ₂ O ₃ and P ₂ O ₅ is contained, it may be difficult to reduce the softening point to 650 ° C. or lower. When one or more of these three components are contained, the total content of these three components is preferably at least 25%. More preferably 30% or more, particularly preferably 3% or more.
5% or more.

The glass of the present invention is substantially 25 to 83.9% of PbO, 11 to 60% of B ₂ O ₃ , 5 to 40% of SiO _{2 and} 0 to 25% of Al ₂ O _{3 based on the following} oxides. _{, Bi 2 O 3 0~35%,} 0~40% MgO, CaO 0~40%, SrO 0~40%, BaO 0~40%, ZnO 0~55%, Li 2 O 0~20%, Na 2 O 0-20%, K ₂ O 0-20%, CuO 0.1-1%, MoO ₃ 0-1.3%, Sb ₂ O ₃ 0-1.3%, and MgO + CaO + SrO + BaO is 0-40.
%.

Next, the preferred composition will be described. Note that B ₂ O ₃ , SiO ₂ , and CuO are omitted because they have been described above. PbO has an effect of lowering the softening point and increasing the expansion coefficient, and is essential. If it is less than 25%, the effect is too small. It is preferably at least 30%, more preferably at least 35%. If it exceeds 83.9%, the relative dielectric constant becomes too large, or the yellow coloring becomes too dark. It is preferably at most 70%, more preferably at most 60%, particularly preferably at most 50%.

Al ₂ O ₃ is not essential, but may be contained up to 25% to stabilize the glass. If it exceeds 25%, the glass may be devitrified. More preferably 15
%, Particularly preferably 10% or less. When Al ₂ O ₃ is contained, its content is preferably 1% or more.

Bi ₂ O ₃ is not essential, but may be contained up to 35% in order to lower the softening point. If it exceeds 35%, the glass may be colored yellow or the relative dielectric constant may be too large. It is more preferably at most 20%, particularly preferably at most 5%.

Although MgO, CaO, SrO and BaO are not essential, they are each 4 to increase the water resistance of the glass or to suppress the phase separation of the glass.
It may be contained up to 0%. If it exceeds 40%, crystallization at the time of firing becomes remarkable, and the transmittance may decrease. It is more preferably at most 30%, particularly preferably at most 25%.
If the relative dielectric constant of the glass is to be particularly reduced, Mg
It is preferable to contain O. However, in this case, the content is preferably 5% or less. If it exceeds 5%, the fluidity of the glass at the time of firing is reduced, and the residual bubbles in the electrode-coated glass layer are increased, so that the transmittance may be reduced. When it is desired to further improve the transmittance, it is preferable that MgO is not substantially contained. Here, “substantially not contained” means that even if it is contained, it is on the order of impurities, and its content is typically 0.5% or less.

Also, B_TwoO_ThreeTo reduce the expansion coefficient
Content is high, for example, B _TwoO_Three20% content
In the above case, it is preferable to contain SrO or BaO.
In particular, it is preferable to contain BaO. Ba
When O or SrO is contained, the sum of these contents
Is preferably 10% or more.

The total content of MgO, CaO, SrO and BaO is at most 40%. More preferably 30%
Or less, particularly preferably 25% or less.

Although ZnO is not essential, it may be contained up to 55% in order to lower the softening point. If it exceeds 55%, the glass may be devitrified. It is more preferably at most 10%.

Each of Li ₂ O, Na ₂ O and K ₂ O is not essential, but each may be contained up to 20% in order to lower the softening point. If it exceeds 20%, the water resistance of the glass may be reduced, or the expansion coefficient may be too large. More preferably, each is 5% or less. The total content of Li ₂ O, Na ₂ O and K ₂ O is 2
It is preferably 0% or less. It is more preferably at most 5%.

MoO ₃ and Sb ₂ O ₃ are each 1.3% in order to prevent a decrease in transmittance of the electrode coating glass layer.
May be contained. If it exceeds 1.3%, Mo or Sb
Is too dark. Each content is preferably 0.9% or less.

The glass of the present invention is preferably substantially composed of the above components, but may contain other components as long as the object of the present invention is not impaired. The total content of the other components is preferably 10% or less. More preferably 5
% Or less. As the other components, P ₂ O ₅ , Fe
Examples include ₂ O ₃ , CoO, NiO, SnO ₂ , In ₂ O ₃ , and CeO ₂ .

[0043]

EXAMPLES The raw materials were mixed and mixed so that the compositions indicated by mass percentages in the columns from PbO to CuO in the table were mixed.
Melted for 1 hour using a platinum crucible in an electric furnace at 00 ° C,
After being formed into a thin glass sheet, it was pulverized with a ball mill to obtain a glass powder. Examples 1 to 10 are Examples and Examples A1 and A2 are Comparative Examples.

The softening point (unit: ° C.), expansion coefficient (unit: 10 ⁻⁷ / ° C.) and relative permittivity of these glass powders were measured as described below. The results are shown in the table. Softening point: Measured using a differential thermal analyzer. Expansion coefficient: After forming the glass powder, the fired body obtained by firing at the firing temperature (unit: ° C.) shown in the table for 10 minutes has a diameter of 5 mm,
Processed into a 2cm long cylindrical shape and measured with a thermal dilatometer 50-350
The average coefficient of linear expansion at ℃ was measured. Relative permittivity: The fired body is 50 mm × 50 mm × thickness 3 m
m, electrode is deposited on the surface and frequency is 1MHz
Was measured.

Further, these glass powder and ethylcellulose were weighed and mixed in a mass ratio of 100: 5, and 2 g of the obtained mixture was put into a cylindrical mold having a diameter of 12 mm and molded to form a cylindrical sample. did. This cylindrical sample was fired at the softening point of the glass powder for 30 minutes to obtain a disk-shaped fired body. The color of this fired body is shown in the table. It is considered that the brown or black color of the fired body has a large amount of carbon-containing impurities in the fired body. Therefore, it is considered that the amount of carbon-containing impurities in the fired bodies of Examples A1 and A2 is large.

Further, 100 g of these glass powders were kneaded with 25 g of an organic vehicle to prepare a glass paste.
The organic vehicle is obtained by dissolving 7 to 18% by mass of ethyl cellulose in diethylene glycol monobutyl ether monoacetate or α-terpineol.

Next, a glass substrate having a size of 10 cm × 10 cm and a thickness of 2.8 mm was prepared, and an ITO transparent electrode having a thickness of 200 nm and a width of 0.5 mm was provided on the surface of the glass substrate. The distance between the center lines of the electrodes is 1.0 mm
Many were formed in parallel so that The glass substrate,
The composition represented by mass percentage is as follows: SiO ₂ : 58%, Al ₂
O ₃ : 7%, Na ₂ O: 4%, K ₂ O: 6.5%, Mg
O: 2%, CaO: 5%, SrO: 7%, BaO: 7.
5%, ZrO ₂ : 3%, glass having a glass transition point of 626 ° C. and an expansion coefficient of 83 × 10 ⁻⁷ / ° C. The ITO transparent electrode is formed on one side of a glass substrate.

30 mm on which an ITO transparent electrode is formed
The glass paste was uniformly screen-printed on a portion having a size of 30 mm, and then dried at 120 ° C. for 10 minutes. The glass substrate was heated at a heating rate of 10 ° C./min until the sintering temperature shown in the table was reached, and the sintering was held at that temperature for 30 minutes. The thickness of the glass layer covering the transparent electrode was 30 μm.

With respect to the glass substrate after firing, a wavelength of 5
50 nm light transmittance (unit:%) and turbidity (unit:
%) Was measured as described below. The results are shown in the table. Transmittance: Self-recording spectrophotometer U-35 manufactured by Hitachi, Ltd.
The transmittance of light having a wavelength of 550 nm was measured using 00 (integrating sphere). It is preferably 77% or more, and 80%
More preferably, it is the above. The state without the sample was set to 100%. In addition, the wavelength of the glass substrate itself is 5
The transmittance for light of 50 nm was 90%.

Turbidity: A haze meter (C light source using halogen bulb) manufactured by Suga Test Instruments Co., Ltd. was used. The light from the halogen sphere is converted into a parallel light beam through a lens, is incident on the sample, and is transmitted by the integrating sphere to the total light transmittance _Tt and the diffuse transmittance _Td.
Was measured. It is preferably at most 20%. In addition,
Turbidity was calculated by turbidity (%) = (T _d / T _t ) × 100. The turbidity of the glass substrate itself is 0.4
%Met.

Comparing Example 2 with Example A1 and Example 4 with Example A2, the inclusion of CuO increases the transmittance.
Also, it can be seen that the turbidity has decreased.

The silver coloring phenomenon was examined as follows. A screen printing silver paste is uniformly screen-printed on a 45 mm × 45 mm portion of a glass substrate having a size of 50 mm × 75 mm and a thickness of 2.8 mm made of the same glass as the glass substrate used previously, and then at 120 ° C. for 10 minutes. Dried. This glass substrate is heated to 580 at a heating rate of 10 ° C./min.
C., heated at that temperature for 15 minutes, and fired to form a silver fired body having a thickness of 5 μm.

A glass paste is screen-printed so as to cover the entire surface of the fired silver body formed on the glass substrate,
Drying and firing were performed to form a glass layer having a thickness of 30 μm. The drying and firing conditions were the same as those for the glass paste described above.

For a sample in which a silver fired body was further formed on a glass substrate, and further a glass layer was formed thereon, the light was incident on the glass layer side so that the reflectance of light having a wavelength of 550 nm was R ₅₅₀ (unit:%). ) And the reflectivity R ₄₃₀ (unit:%) of light having a wavelength of 430 nm were measured by the self-recording spectrophotometer. R ₅₅₀ -R ₄₃₀ (unit:%) are shown in the column of silver coloring in the table. The wavelength of 430 nm was selected because it corresponds to the absorption peak of silver colloid that causes silver coloration, while the wavelength of 550 nm was selected because it was sufficiently far from the silver colloid absorption peak. .

When R ₅₅₀ -R ₄₃₀ is 20% or more, the silver coloring phenomenon is remarkable, which is not preferable. More preferably 15%
Or less, particularly preferably 5% or less. Although Example 5 In R _{55 0} -R ₄₃₀ is negative, which is believed to be due to absorption of light having a wavelength of 550nm by Cu ⁺ ions.

[0056]

[Table 1]

[0057]

[Table 2]

[0058]

By using the glass of the present invention, the transparency of the glass layer covering the transparent electrode on the glass substrate can be increased. In addition, the residual amount of carbon-containing impurities in the glass layer is reduced, so that the brightness of the PDP is hardly reduced.
Furthermore, the silver coloring phenomenon of the glass layer covering the silver electrode on the glass substrate can be suppressed. Further, the relative dielectric constant of the glass layer covering the electrode can be reduced.

PDP using glass of the present invention for electrode coating
, The transmittance of the front substrate is high and the image quality is excellent. In addition, a decrease in luminance hardly occurs. Furthermore, the silver coloring phenomenon of the glass layer covering the silver electrode on the front substrate can be suppressed, and the image quality is improved in this respect as well. Further, the power consumption of the PDP can be reduced.

Continued on front page F-term (reference) 4G062 AA08 AA09 BB04 BB05 DA03 DB01 DB02 DB03 DB04 DC04 DC05 DC06 DD02 DE01 DE02 DE03 DE04 DE05 DE06 DF04 DF05 DF06 DF07 EA01 EA02 EA03 EA04 EA10 EB01 EB02 EC03 ED03 EC04 ED05 EE01 EE02 EE03 EE04 EE05 EF01 EF02 EF03 EF04 EF05 EG01 EG02 EG03 EG04 EG05 FA01 FB01 FC01 FD01 FE01 FF01 FG01 FH01 FJ01 FK01 FL01 GA01 GA02 GA03 GA04 GA05 GA10 GB01 H01H01 H01 H01 H01 H01 H JJ03 JJ04 JJ05 JJ07 JJ10 KK01 KK03 KK05 KK07 KK10 MM05 MM12 MM23 NN32 PP13 PP16

Claims (5)

[Claims] (1) a softening point of 650 ° C. or less;
A low-melting glass having an average coefficient of linear expansion at 0 ° C. of 90 × 10 ⁻⁷ / ° C. or less, wherein B ₂ O ₃ , SiO ₂ and C
containing uO and having a B ₂ O ₃ content of 11
%, A SiO ₂ content of 5% or more, and a CuO content of 0.1 to 1%. 2. The low-melting glass according to claim 1, wherein a value obtained by dividing the content of SiO _{2 in} mass percentage by the content of B ₂ O ₃ in the same representation is SiO ₂ / B ₂ O ₃ of 0.09 or more. . 3. The low-melting glass according to claim 1, which has a relative dielectric constant of 12 or less. 4. The method according to claim 1, which comprises at least one member selected from the group consisting of PbO, Bi ₂ O ₃ and P ₂ O _5.
The low-melting glass according to 1. In 5. A following oxides in mass percentage, _{substantially, PbO 25~83.9%, B 2 O} 3 11~60%, SiO 2 5~40%, Al 2 O 3 0~25 _{%, Bi 2 O 3 0~35%} , 0~40% MgO, CaO 0~40%, SrO 0~40%, BaO 0~40%, ZnO 0~55%, Li 2 O 0~20%, Na ₂ O 0-20%, K ₂ O 0-20%, CuO 0.1-1%, MoO ₃ 0-1.3%, Sb ₂ O ₃ 0-1.3%, wherein MgO + CaO + SrO + BaO is 0- 40
The low melting point glass according to claim 1, 2, 3 or 4.