JP2003020251A - Glass frit for formation of barrier wall, back glass substrate for plasma display panel and plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass frit from which barrier walls having low dielectric constant for a plasma display panel(PDP) can be obtained and to provide a PDP having the above barrier walls. SOLUTION: The glass frit for the formation of barrier walls contains glass powder, and a calcined body obtained by calcining the glass frit has <=13 relative dielectric constant ε at 20 deg.C and 1 MHz and >=70 MPa three-point bending strength. Or the glass frit for formation of barrier walls contains glass powder and aluminum borate powder. In the PDP having discharge cells divided by barrier walls and disposed between two glass substrates facing each other, the barrier walls of the PDP are obtained by calcining the above glass frit for the formation of barrier walls.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass frit used for forming partition walls of plasma display panels (PDPs), fluorescent display tubes (VFDs), rear glass substrates for PDPs, and PDPs.

[0002]

2. Description of the Related Art In a PDP, a discharge cell is typically defined by a front glass substrate used as a display surface, a rear glass substrate, and barrier ribs, and a He--Xe mixture sealed in the discharge cell is formed. An ultraviolet ray generated by plasma discharge of gas, Ne-Xe mixed gas, or the like causes the phosphor to emit light, thereby forming an image.

A transparent electrode and a dielectric layer for covering the transparent electrode are usually formed on the surface of the front glass substrate, and the dielectric layer is covered with a MgO film for protection. An address electrode and an insulating coating layer that covers the address electrode are usually formed on the surface of the rear glass substrate, and a partition is formed on the insulating coating layer.

The partition walls are formed in a grid pattern at equal intervals over the entire screen, and the grid interval is typically 200 to 300 μm. The width and height of the partition wall are typically 80
μm and 150 μm.

The partition walls contain a glass frit for forming partition walls, that is, a glass powder having a softening point T _S of 500 to 620 ° C. or less (hereinafter referred to as a low melting point glass powder) and a heat resistant pigment for color tone adjustment as essential components. Besides, it is formed by firing a glass frit containing a ceramic filler or the like as necessary to maintain the shape of the partition wall.

Usually, PbO-is used as the low melting point glass powder.
SiO ₂ —B ₂ O ₃ -based glass powder, white pigment such as titania or black pigment such as Cr—Cu complex oxide as a heat resistant pigment, alumina as a ceramic filler,
Powders such as zircon and zirconia are used, respectively. The molar% typical composition of the display of the _PbO-SiO 2 _-B 2 _{O 3} based _{glass, B 2 O 3 15%,} Si
O ₂ 40%, PbO 35%, Al ₂ O ₃ 5%, Ti
O ₂ 5%.

[0007]

Although the PDP is excellent as a large-sized thin flat display, it has a problem of high power consumption. One of the causes is that the partition wall has a high dielectric constant. Incidentally, the relative permittivity ε of the conventional partition wall at 20 ° C. and 1 MHz was about 16.

In order to reduce the ε of the partition wall, PbO-Si
In order to reduce ε of the O ₂ —B ₂ O ₃ -based low melting point glass powder, it is necessary to increase the B ₂ O ₃ content. However, increasing the B ₂ O ₃ content lowers the chemical durability and makes it difficult to use as a PDP partition wall.

The present invention is a PDP having a partition wall with a small ε.
The purpose of the present invention is to provide a rear glass substrate and a PDP for glass, and a glass frit for forming partition walls capable of forming such partition walls.

[0010]

The present invention relates to a glass frit containing glass powder, wherein a fired body obtained by firing the glass frit has a relative dielectric constant ε at 20 ° C. and 1 MHz of 13 or less. 3-point bending strength is 70 MPa
A glass frit for forming partition walls, which is characterized by the above, is provided (glass frit A). Further, there is provided a glass frit containing a glass powder and an aluminum borate powder, wherein the content of the aluminum borate powder in terms of mass percentage is 0.5 to 30% for forming partition walls (glass frit B). ).

Further, the rear glass substrate for a plasma display panel has an address electrode and an insulating coating layer covering the address electrode formed on the surface of the glass substrate, and a partition wall formed on the insulating coating layer. Thus, there is provided a rear glass substrate for a plasma display panel, wherein the partition wall is formed by using the wall-forming glass frit.

Further, in a plasma display panel in which discharge cells partitioned by barrier ribs are formed between two glass substrates facing each other, the barrier ribs are obtained by firing the glass frit for forming barrier ribs. I will provide a.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The glass frit referred to in the present invention is
It is an inorganic powder containing glass powder as an essential component. The glass frit A may consist of only glass powder, or aluminum borate powder, heat-resistant pigment, which will be described later,
You may contain a non-essential component, such as an inorganic filler. In the glass frit B, aluminum borate powder is essential in addition to glass powder, and in addition to these, non-essential components such as heat resistant pigments and inorganic fillers may be contained.

The first aspect of the glass frit of the present invention (hereinafter simply referred to as the glass frit of the present invention) is the glass frit A and the second aspect is the glass frit B, both of which are usually glass paste or Used as a green sheet. The glass paste is obtained by adding the glass frit of the present invention to a resin such as ethyl cellulose and α
-It is kneaded with a vehicle composed of a solvent such as terpineol and diethylene glycol monobutyl ether acetate, and the content in terms of mass percentage is typically 70 to 90% for the glass frit of the present invention and 10 for the vehicle. 30%.

In the green sheet, the glass frit of the present invention is obtained by using a resin such as acrylic resin, a plasticizer such as dibutyl phthalate or dimethyl phthalate, and toluene or α.
-Slurry is prepared by mixing with a solvent such as terpineol or propylene glycol monobutyl ether, and the slurry is applied to a supporting film such as polyethylene terephthalate (PET) by a method such as die coating and dried to remove the solvent, and then the supporting film is removed. It is made by peeling it off.

The content of the green sheet in terms of mass percentage is typically 60 for the glass frit of the present invention.
-80%, resin 19-39%, plasticizer 1-4%. The thickness of the support film is typically 20 to
It is 100 μm and is usually surface-treated with a release agent or the like.

The PDP of the present invention is a PDP in which discharge cells divided by partition walls, which are obtained by firing the glass frit of the present invention, are formed between two opposing glass substrates.
DP, which is manufactured as follows, for example. Of the two glass substrates facing each other, the front glass substrate is manufactured by forming a transparent electrode, a dielectric layer covering the transparent electrode, and an MgO film covering the dielectric layer on the glass substrate. .

The rear glass substrate is manufactured by forming an address electrode and an insulating coating layer covering the address electrode on the glass substrate, and forming a partition wall on the insulating coating layer using the glass frit of the present invention. To be done. The back glass substrate is the back glass substrate for PDP of the present invention.

The glass substrates used for the front glass substrate and the rear glass substrate are usually SiO ₂ --Al ₂ O ₃ --R ₂ O--R'O (R ₂ O) such as soda lime silica glass.
Is an alkali metal oxide and R'O is an alkaline earth metal oxide) type glass. The glass transition point of the glass substrate,
The average linear expansion coefficient α of 50 to 350 ° C. is typically 550 to 620 ° C. and 80 × 10 ^{−7 to} 90 × 10, respectively.
^-7 / ° C. The thickness of the glass substrate is usually 1 to 3 mm
Is.

The address electrodes are usually in the form of stripes, and are prepared by printing a photosensitive metal paste composed of a metal powder such as silver and a photosensitive resin, exposing through a photomask, developing, and baking. To be done. The thickness of the address electrode is typically 3 to 10 μm. The width of the address electrodes is typically 20 to 100 μm, and the interval is typically 100 to 400 μm.

The insulating coating layer usually has a softening point T _S of 62.
A glass frit for an insulating coating layer containing a glass powder at 0 ° C. or lower is applied as a glass paste or is attached as a green sheet, and is typically fired at 530 to 620 ° C. to be formed. The thickness of the insulating cover layer is typically 5
˜30 μm.

The partition wall is formed, for example, by applying the glass frit of the present invention as a glass paste by a screen printing method, a transfer method, or the like, or by applying the glass frit of the present invention as a green sheet. Next, the barrier ribs are processed into a desired barrier rib pattern by a sandblast method, an etching method, or the like, and fired to form barrier ribs.

When the partition wall is formed by sandblasting, first, the glass paste is applied to the insulating coating layer in a solid state, or the green sheet is attached to the insulating coating layer. Next, a dry film resist is attached on the applied glass paste or the attached green sheet, an exposure mask of a partition pattern is set and exposed, and developed with a developing solution such as a sodium carbonate aqueous solution, Line width is typically 80μ
A stripe-shaped partition wall pattern with m and a pitch of 300 μm is formed.

Next, after removing unnecessary portions by sandblasting, the remaining dry film resist is removed using an aqueous solution of sodium hydroxide or the like to obtain unfired partition walls. This unfired partition is typically fired at 530 to 620 ° C. to form a partition. The front glass substrate and the rear glass substrate manufactured in this manner are formed into a panel to manufacture the PDP of the present invention.

Glass powder is essential in the glass frit of the present invention. The glass powder has a T _S of 500 to 62.
0 ° C. and α is 65 × 10 ^{−7 to} 85 × 10 ⁻⁷ / ° C.
Is preferred. Outside this range, it may be difficult to use it for forming partition walls. Further, ε is preferably 13 or less. If it exceeds 13, the power consumption of the PDP may increase. More preferably, it is less than 12. Further, ε is typically 7 or more.

The glass powder has a T _S of 500 to 62.
0 ° C., ε is 13 or less, and α is 65 × 10 ⁻⁷
It is preferably −85 × 10 ⁻⁷ / ° C., and more preferably ε is less than 12.

Further, the glass powder preferably contains B ₂ O ₃ . If B ₂ O ₃ is not contained, ε may increase. When the glass powder contains B ₂ O ₃ ,
The content is preferably 5 mol% or more. More preferably, it is 10 mol% or more. The content is preferably 80 mol% or less. If it exceeds 80 mol%, the chemical durability is lowered. More preferably 45 mol%
Hereafter, it is particularly preferably 40 mol% or less.

The glass powder is essentially expressed in mol% based on the following oxides: B ₂ O ₃ 5 to 80%, SiO ₂ 0 to 45%, ZnO 0 to 50%, PbO + Bi ₂ O ₃ 0 to _{50%, MgO + CaO + SrO} + BaO 0~50%, Li 2 O + Na 2 O + K 2 O 0~30%, Al 2 O 3 + TiO 2 + ZrO 2 0~13%, preferably made of. The composition of this preferable glass powder will be described below except for B ₂ O ₃ described above.

SiO ₂ is not essential but may be contained up to 45% in order to stabilize the glass or reduce ε. If it exceeds 45%, T _S tends to be too high. Preferably 3
It is 5% or less, more preferably 30% or less. SiO ₂
When it contains, the content is preferably 1% or more. More preferably 3% or more, particularly preferably 5%
As described above, it is most preferably 10% or more.

ZnO is not essential, but may be contained up to 50% in order to reduce T _S or improve chemical durability. If it exceeds 50%, vitrification tends to be difficult. It is preferably 45% or less, more preferably 40% or less. When ZnO is contained, its content is preferably 1% or more. It is more preferably 3% or more, and particularly preferably 5% or more.

Neither PbO nor Bi ₂ O ₃ is essential, but it may be contained up to 50% in total in order to reduce T _S. Total of these contents PbO + Bi ₂ O ₃
Is more than 50%, ε becomes too high. Preferably 40%
Or less, more preferably 30% or less.

MgO, CaO, SrO and BaO are not essential, but may be contained up to 50% in total for stabilizing the glass. If the total content of these four components, MgO + CaO + SrO + BaO, exceeds 50%, vitrification becomes difficult. It is preferably 30% or less, more preferably 10% or less. When it contains any one or more of MgO, CaO, SrO and BaO, MgO +
CaO + SrO + BaO is preferably 2% or more, more preferably 4% or more.

Li ₂ O, Na ₂ O and K ₂ O are not essential, but may be contained up to 30% in total in order to lower T _S and increase fluidity. If the total content of these three components, Li ₂ O + Na ₂ O + K ₂ O, exceeds 30%, the chemical durability is lowered, or the electrical insulation is lowered. It is preferably 25% or less, more preferably 15% or less.

Al_TwoO_Three, TiO_TwoAnd ZrO_TwoYes
Displacement is not essential, but in order to increase chemical durability
It may contain up to 13% in total. Content of these 3 components
Of total Al_TwoO_Three+ TiO_Two+ ZrO_TwoIs over 13%
T_SIs too high. Preferably 10% or less, more preferably
It is preferably 5% or less. Al_TwoO_Three, TiO_TwoOr
ZrO_TwoWhen any one or more of_TwoO
_Three+ TiO_Two+ ZrO _TwoIs preferably 0.5% or more
It is more preferably 1% or more.

The preferred glass powder essentially consists of the above.
The total content of the other components is 5%.
You may As such an ingredient, La_TwoO_Three, CeO_Two
Rare earth oxides such as SnO_Two, CuO, P_TwoO₅, Ti
O_Two, MnO, Fe_TwoO_Three, CoO, NiO, Ge
O_Two, Y_TwoO_Three, MoO_Three, Rh_TwoO_Three, Ag_TwoO, I
n _TwoO_Three, TeO_Two, WO_Three, ReO_Two, V_TwoO₅, P
An example is dO.

The ε of the fired body obtained by firing the glass frit A is 13 or less, and the three-point bending strength W is 70 MPa.
That is all. If ε exceeds 13, the power consumption of the PDP having the fired body as the partition wall increases. It is preferably 12 or less, more preferably 11.5 or less. W is 70MP
If it is less than a, the partition wall may be damaged when the panel is formed. It is preferably 80 MPa or more.

The W is measured, for example, as follows.
That is, the glass frit is made into a paste, and the obtained glass paste is heated to 400 to 450 ° C. to burn the resin and make it powdery again. Next, the powdery material is press-molded into an appropriate shape and then fired, and the fired body obtained is subjected to JI.
Polishing is performed by using a round bar processing machine on which S-standard # 170 diamond abrasive grains are electrodeposited to obtain a sample having a diameter of 3.5 mm and a length of 25 mm. 15m span for the sample
m, and a crosshead speed of 0.5 mm / min, a three-point bending strength test was performed to measure the three-point bending strength. This test is typically repeated 5 times, and the average value of the obtained 3-point bending strengths is calculated, which is designated as W.

Next, the components of the glass frit A will be described in terms of mass percentage. As described above, the glass powder is indispensable, and its content is preferably 55% or more. If it is less than 55%, the sinterability may be insufficient. It is more preferably 70% or more. In addition, when a component other than glass powder such as aluminum borate powder is contained, the content of glass powder is preferably 99.5% or less. If it exceeds 99.5%, the contents of the components other than the glass powder are small, and the effect of containing the components may be small. It is more preferably 98% or less, and particularly preferably 90% or less.

Aluminum borate powder is not essential, but may be contained up to 30% in order to increase W.
If it exceeds 30%, the content of the glass powder tends to be too small and the sinterability may decrease. It is more preferably 10% or less. When the aluminum borate powder is contained, its content is preferably 0.5% or more. If it is less than 0.5%, W may not increase. More preferably, it is 3% or more.

The aluminum borate powder may or may not be a whisker-like powder. The whisker-like powder has a fiber diameter of 0.1 to 10 μm and a fiber length of 0.1.
5-100 μm, fiber diameter / fiber length 0.001-0.1
And typically has a fiber diameter of 0.1 to 1.0 μm and a fiber length of 1 to 30 μm. If the aluminum borate powder is a non-whisker-like powder, that is, a powder having a fiber diameter / fiber length of more than 0.1, its average particle diameter is 1
It is preferably ˜8 μm.

The heat-resistant pigment is not essential, but may be contained up to 20% for the purpose of adjusting the color tone, and a white pigment such as titania,
Fe-Mn mixed oxide system, Fe-Co-Cr mixed oxide system,
Examples of black pigments include Fe-Mn-Al mixed oxides and Cu-Cr mixed oxides. If it exceeds 20%, the sinterability may decrease. It is preferably 10% or less, more preferably 5% or less. When the heat-resistant pigment is contained, its content is preferably 0.5% or more. If it is less than 0.5%, the effect of coloring may be small.

The inorganic filler is not essential, but may be contained up to 30% in order to maintain the shape of the fired body obtained by firing the glass frit or to increase the strength of the fired body. If it exceeds 30%, the sinterability will decrease. It is preferably 10% or less. The inorganic filler in the present invention has a melting point or a glass transition point of 700 ° C. or higher and is an inorganic substance excluding aluminum borate, typically an oxide powder, and α-alumina, mullite, zircon,
Examples of the powder include cordierite, zirconia, aluminum titanate, β-spodumene, α-quartz, fused quartz, β-quartz solid solution, and β-eucryptite.

Next, the components of the glass frit B will be described in terms of mass percentage. As described above, the glass powder is indispensable, and its content is preferably 55% or more. If it is less than 55%, the sinterability may be insufficient. It is more preferably 70% or more. Also, 9
If it exceeds 9.5%, W tends to be small. It is preferably 98% or less, more preferably 90% or less.

Aluminum borate powder is a component for increasing W and is essential. If it is less than 0.5%, W tends to be small. More preferably, it is 3% or more. If it exceeds 30%, the sinterability will decrease. It is more preferably 10% or less. The aluminum borate powder may or may not be a whisker-like powder as described above for glass frit A.

The heat-resistant pigment is not essential, but as described above for the glass frit A, it is necessary to adjust the color tone by 20.
You may contain up to%. If it exceeds 20%, the sinterability may decrease. It is preferably 10% or less, more preferably 5% or less. When the heat-resistant pigment is contained, its content is preferably 0.5% or more. If it is less than 0.5%, the effect of coloring may be small.

The inorganic filler is not essential, but in order to maintain the shape of the fired body obtained by firing the glass frit or to increase the strength of the fired body, as described above for the glass frit A. You may contain up to 30%. If it exceeds 30%, the sinterability will decrease. It is preferably 10% or less.

The glass frits of the present invention are essentially 55 to 99.5% glass powder, 0.5 by weight percent, 0.5.
It is preferable to consist of -30% aluminum borate powder, 0-20% heat resistant pigment, and 0-30% inorganic filler. The term “consisting essentially of” as used herein means that components other than these four components may be contained within a range that does not impair the object of the present invention. The total content of components other than the above four components is preferably 10% or less.

[0048]

EXAMPLE The composition expressed in mol% is SiO ₂ 40%, B
₂ O ₃ 15%, PbO 35%, Al ₂ O ₃ 5%,
Raw materials were prepared and mixed so that TiO _{2 was} 5%, put into a platinum crucible, and kept at 1200 ° C. for 30 minutes to obtain molten glass. Next, the molten glass was cast into a stainless steel roller to form flakes, and the flaky glass was crushed for 30 hours with an alumina ball mill to obtain glass powder. The glass powder had a T _S of 560 ° C. and an ε of 1
2.5 and α were 73 × 10 ⁻⁷ / ° C.

Next, the glass powder, the whisker-like aluminum borate powder, the non-whisker-like particulate aluminum borate powder, and the fused silica powder as the inorganic filler are made to have the compositions shown in Table 1 in terms of mass percentage. Were mixed and mixed into a glass frit. Examples 1 and 2 are examples, and Examples 3 and 4 are comparative examples. In addition, as a whisker-like aluminum borate powder, Arborex Y (fiber diameter: 0.5 to 1 μm, fiber length: 1 manufactured by Shikoku Chemicals Co., Ltd.)
0 to 30 μm, fiber diameter / fiber length: 0.01 to 0.1)
As a particulate aluminum borate powder, Arbolite PF03 (average particle diameter: 3.0 μm) manufactured by the same company was used.

Next, 100 g of the glass frit is added to 2
A glass paste was prepared by kneading with a vehicle composed of g of ethyl cellulose and 22 g of α-terpineol. This glass paste has a thickness of 2.8 mm and a size of 50 mm.
Blade coating on a soda lime silica glass substrate of × 50 mm and drying at 120 ° C. for 120 minutes to give a film thickness of 160 μm
A dry film of

After laminating a dry film resist on the dried film, an exposure mask having a partition pattern was set and exposed. Then, it was developed with a sodium carbonate aqueous solution having a concentration of 5 g / L to form a partition pattern having a line width (partition width) of 80 μm and a space width (lattice interval) of 220 μm on the dry film.

Next, sandblasting was performed to cut unnecessary portions to obtain unfired partition walls. The dry film remaining on the unfired partition walls was removed with an aqueous sodium hydroxide solution having a concentration of 10 g / L, and then fired at 580 ° C. The cross section of the obtained partition wall was observed with a scanning electron microscope to evaluate the sinterability. The results are shown in the table.

Further, the glass paste was blade-coated on a soda lime silica glass substrate having a size of 50 mm × 75 mm in which a silver electrode was formed on the entire surface on one side, and 1
After drying at 20 ° C. for 120 minutes, it was baked at 580 ° C. for 15 minutes to obtain a fired body having a thickness of 100 μm. A circular aluminum electrode having a diameter of 38 mm was vapor-deposited on the surface of this fired body, and the relative dielectric constant ε at 20 ° C. and 1 MHz was measured. The results are shown in the table.

The glass paste is added in the range of 400-45.
Ethyl cellulose was burned by heating to 0 ° C., and the three-point bending strength (unit: MPa) was measured as described above. In addition, each measurement was performed 5 times (W1-W5).
The results are shown in the table. W is an average value of W1 to W5.

[0055]

[Table 1]

[0056]

INDUSTRIAL APPLICABILITY According to the present invention, partition walls having a small ε and excellent strength, and P having such partition walls are provided.
A back glass substrate for DP and a PDP can be obtained.

Continued front page    F term (reference) 4G062 AA08 AA09 BB04 BB05 BB08                       CC10 DA01 DA02 DA03 DA04                       DA05 DB01 DB02 DB03 DB04                       DC03 DC04 DC05 DC06 DC07                       DD01 DD02 DE01 DE02 DE03                       DE04 DE05 DF01 DF02 DF03                       DF04 DF05 EA01 EA02 EA03                       EA04 EA10 EB01 EB02 EB03                       EB04 EC01 EC02 EC03 EC04                       ED01 ED02 ED03 ED04 ED05                       EE01 EE02 EE03 EE04 EE05                       EF01 EF02 EF03 EF04 EF05                       EG01 EG02 EG03 EG04 EG05                       FA01 FA10 FB01 FB02 FB03                       FB04 FC01 FC02 FC03 FC04                       FD01 FD02 FE01 FE02 FE03                       FF01 FF02 FG01 FH01 FJ01                       FJ02 FK01 FK02 FK03 FL01                       FL02 FL03 GA01 GA02 GA03                       GA04 GA10 GB01 GC01 GD01                       GD02 GE01 HH01 HH03 HH04                       HH05 HH06 HH07 HH08 HH09                       HH10 HH11 HH12 HH13 HH14                       HH15 HH17 HH20 JJ01 JJ03                       JJ05 JJ07 JJ10 KK01 KK02                       KK03 KK04 KK05 KK06 KK07                       KK08 KK10 MM08 NN33 NN40                       PP01 PP02 PP03 PP04 PP09                       PP11 PP13                 5C040 GF18 KA08 KA09 KB03 KB11                       KB19 KB28 KB29 MA12

Claims (9)

[Claims] 1. A glass frit containing glass powder, which is a fired body obtained by firing the glass frit.
The relative dielectric constant ε at 0 ° C. and 1 MHz is 13 or less,
A glass frit for forming partition walls, which has a three-point bending strength of 70 MPa or more. 2. The glass frit for forming partition walls according to claim 1, which contains aluminum borate powder. 3. A glass frit containing a glass powder and an aluminum borate powder, wherein the content of the aluminum borate powder in terms of mass percentage is 0.5 to 30%. 4. Essentially 55-99.
The glass frit for forming partition walls according to claim 2 or 3, comprising 5% glass powder, 0.5 to 30% aluminum borate powder, 0 to 20% heat resistant pigment, and 0 to 30% inorganic filler. 5. A glass powder having a softening point of 500 to 620 ° C.
The relative dielectric constant ε at 20 ° C. and 1 MHz is 13 or less, and the average linear expansion coefficient at 50 to 350 ° C. is 6.
The glass frit for forming partition walls according to claim 1, which is a glass powder having a density of 5 × 10 ^{−7 to} 85 × 10 ⁻⁷ / ° C. 5. 6. The glass powder essentially comprises B ₂ O ₃ 5 to 80%, SiO ₂ 0 to 45%, ZnO 0 to 50%, PbO + Bi ₂ O ₃ 0 to 0, expressed in mol% based on the following oxides. _{50%, MgO + CaO + SrO} + BaO 0~50%, Li 2 O + Na 2 O + K 2 O 0~30%, Al 2 O 3 + TiO 2 + ZrO 2 0~13%, barrier ribs formed according to claim 1 consisting of Glass frit. 7. The glass frit for forming partition walls according to claim 1, wherein the glass powder contains B ₂ O _3, and the content thereof is 40 mol% or less. 8. An address electrode and an insulating coating layer for coating the address electrode are formed on the surface of a glass substrate,
A rear glass substrate for a plasma display panel, wherein a partition is formed on the insulating coating layer, wherein the partition is formed by using the partition-forming glass frit according to any one of claims 1 to 7. Is a rear glass substrate for a plasma display panel. 9. A glass for forming a barrier rib according to claim 1, wherein the barrier rib is a plasma display panel in which discharge cells separated by a barrier rib are formed between two glass substrates facing each other. A plasma display panel made by burning frit.