KR100994925B1 - Phosphate Based Glass Composition for Flat Panel Display Sealing - Google Patents

Abstract

The present invention relates to a phosphate-based glass composition for sealing flat panel displays, and in particular, P ₂ O ₅ 30 to 70 mol%, ZnO 10 to 60 mol% and Sb ₂ O without substantially including a lead (Pb) component ₃ 1 to 40 mol% of the main component, a thermal expansion coefficient of 55 to 90 x 10 ^-7 / ℃ in the range of room temperature to glass transition temperature (T _g ), a glass transition temperature of 300 ℃ to 400 ℃ Glass composition and 70-70 containing the said glass It relates to a glass composition containing 99% by weight and 1 to 30% by weight of the low-expansion ceramic filler.

The phosphate-based glass composition for sealing a flat panel display according to the present invention is an environmentally friendly glass composition which does not contain lead components and does not have a problem of environmental pollution, and does not use rare earth elements, which requires low cost of materials and has improved glass stability. Borosilicate glass substrate, especially low expansion, because it has a low glass transition temperature of 400 ℃ or less to prevent thermal damage and can be sealed at a low temperature, and the thermal expansion coefficient is adjustable to have a low value of 35 to 90 x 10 ^-7 / ℃ There is an advantage that can effectively seal the display glass substrate.

 Lead free, frit, phosphate glass, flat panel display panels, sealed

Description

Phosphate Based Glass Composition for Flat Panel Display Sealing

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphate glass composition for sealing flat panel displays, and to a glass composition having a low melting point and a low coefficient of thermal expansion.

Flat panel display panels include LCD, PDP, and OLED. Unlike conventional CRT displays, flat panel display panels are commonly referred to as display panels, which are thin, large in size, and capable of providing high-definition images.

A general flat panel display panel has a structure of forming a light emitting and electrode layer between two glass substrates and sealing the two substrates. For example, in the case of PDP, the sealing layer has a height of 150 to 200 μm and a line width of about 3 to 6 mm. Forming. The encapsulating material functions as an adhesive for protecting the light emitting layer and the electric element inside the panel and encapsulating the upper and lower glass substrates, and after dispensing on the substrate in a paste state, is generally baked at a temperature of 450 to 480 ° C.

These encapsulation materials are generally composed of mother glass, ceramic fillers and organic vehicles, and the parent glass material determines the properties of most encapsulation materials, the ceramic filler is responsible for the adjustment of the coefficient of thermal expansion, and the organic vehicle is the A material that is mixed for dispensing.

Conventional encapsulation materials mainly used mother glass materials containing lead oxide with low softening point and excellent encapsulation characteristics. However, due to the fermentation of RoHS and WEEE, development of eco-friendly materials containing no lead is urgently needed.

In addition, PDP glass substrates have a thermal expansion coefficient of about 80 x 10 ^-7 / ℃, and the thermal expansion coefficient of the mother glass material can be adjusted through a ceramic filler at a level of 100 x 10 ^-7 / ℃, but it is used for AM-OLED, etc. The thermal expansion coefficient of the borosilicate glass substrate mainly composed of SiO ₂ -B ₂ O ₃ is about 40 × 10 ⁻⁷ / ° C. In order to cope with this, it is necessary to lower the thermal expansion coefficient of the mother glass itself.

As lead-free glass frit material containing no lead, bismuth-based glass materials can be fired at low temperatures, but the unit cost is high and the thermal expansion coefficient is about 100 to 110 x 10 ^-7 / ℃. -It is difficult to apply to borosilicate low expansion glass substrates such as OLED.

In addition, the silicic acid-based glass material is easy to control the thermal expansion coefficient through the control of additives such as Al ₂ O ₃ to B ₂ O ₃ , but the softening point has to increase the firing temperature has a limitation in the actual process application.

In addition, P ₂ O ₅ -SnO-based glass as a phosphate mother glass material has a disadvantage in that it is difficult to control the composition by oxidation / reduction of SnO and has a high coefficient of thermal expansion.

The present invention provides a phosphate-based glass composition for sealing a flat panel display having a low melting point and a low coefficient of thermal expansion, and is substantially free of lead (Pb) components and contains 30 to 70 mol% of P ₂ O ₅ , ZnO 10. Provided is a glass composition containing, as a main component, from 60 to 60 mol% and Sb ₂ O ₃ 1 to 40 mol%.

Conventional techniques for lead-free glass compositions include U.S. Pat.No. 6,255,239, which provides glass compositions that do not contain alkali metal ions and lead. However, bismuth-borosilicates are used as the main component. The material and composition are different, Korean Patent Laid-Open Publication No. 2006-0000515 provides a lead-free glass composition for plasma display panel partition walls, but to provide a glass composition for PDP partition walls having a low dielectric constant and excellent etching characteristics, ZnO, BaO And B ₂ O ₃ as a main component, and its purpose, main substance and composition are different from the present invention, and Korean Laid-Open Patent Publication No. 2008-0003676 is also intended to provide a glass composition for PDP partition walls, ZnO and B ₂ O ₃ The purpose, main substance, and composition differ from this invention which makes it a main component.

Korean Patent Laid-Open No. 2008-0037889 relates to a low melting point glass composition for OLED encapsulation, and provides a glass composition containing essentially 20 to 80% by weight of Bi ₂ O ₃ , but the main material and composition is different from the present invention. International Patent Publication No. WO07 / 067402 relates to a fleet composition for sealing glass and a sealing method, wherein the mother glass contains P ₂ O ₅ and V ₂ O ₅ . Different from the above, European Patent No. 1518835 provides a glass composition suitable for a glass substrate for display, in particular a TFT-LCD glass substrate, which differs in its object, main material and composition from the present invention.

European Patent No. 0566866 provides a phosphate-based glass composition having a low melting point, but the present invention differs from the main material, the composition and the thermal properties of the glass composition, European Patent No. 0481166 describes a phosphate-based glass composition However, to provide a glass composition for a glass mold (mold), ZnO, Al ₂ O ₃ and P ₂ O ₅ as a main component of the present invention, the main substance and composition is different from the present invention, European patent No. 0393625 provides a glass composition mainly composed of sodium silicate for glass bubbles, but differs in object, main substance and composition from the present invention.

European Patent No. 0587979, Japanese Patent Laid-Open No. 2002-154840, Japanese Patent Laid-Open No. 2001-48583 and Japanese Patent Laid-Open No. 2000-44282 are based on SiO ₂ -Al ₂ O ₃ -Li ₂ O ₃ system. A low thermal expansion coefficient and a transparent crystalline glass composition are provided, but the object, main material and composition thereof are different from the present invention, and US Patent Publication No. 2003-0050173 provides a glass composition for a glass substrate for an optical interference filter. For this purpose, the thermal properties of the main material, composition and glass composition are different from the present invention.

The technical object of the present invention is substantially free of lead, so that it is possible to cope with environmental regulations, and the burden of raw material cost is low, and the glass transition temperature is 400 degrees or less, in detail, 200 to 400 degrees low temperature firing is possible. It is possible to ensure the economical cost of production, and to provide a glass composition for sealing a flat panel display panel that can cope with a low-expansion glass substrate with a low coefficient of thermal expansion of 35 to 90 x 10 ^-7 / ℃ level.

As described above, conventional lead-free frits are usually expensive or difficult to seal at low temperatures, and in the case of a composition capable of low temperature sealing, the coefficient of thermal expansion is high and thus it is not applicable to a low-expansion flat panel display glass substrate.

Applicants have solved the problems of conventional lead-free frit to reduce the manufacturing cost using economical raw materials, to develop low-temperature sealing, lead-free glass composition with excellent fluidity and low coefficient of thermal expansion to solve the problem of environmental pollution It was possible to provide a glass composition that can be applied to a low-expansion flat panel display glass substrate such as AM-OLED.

Glass composition for sealing a flat panel display according to the present invention contains a mother glass, the mother glass does not contain lead (Pb), P ₂ O ₅ 30 to 70 mol%, ZnO It contains 10 to 60 mol% and Sb ₂ O ₃ 1 to 40 mol%, the coefficient of thermal expansion is 55 to 90 x 10 ^-7 / ℃, the glass transition temperature is characterized by 300 ℃ to 400 ℃.

When the glass composition of the present invention contains V ₂ O ₅ , the glass composition for sealing a flat panel display according to the present invention contains a mother glass, and the mother glass contains 40 to 95 mol% of a three component based glass and V ₂ O ₅ 5 to 60 mol%, the three-component glass does not contain lead (Pb), P ₂ O ₅ 30 to 70 mol%, ZnO 10 to 60 mol% and Sb ₂ O ₃ 1 to It contains 40 mol%, has a coefficient of thermal expansion of 55 to 90 x 10 ^-7 / ℃, the glass transition temperature is 300 to 400 ℃.

The glass composition of the present invention is used as a frit composition for sealing a flat panel display panel and has no feature of containing lead.

In detailing the glass composition of the present invention, the mole percent of the materials constituting the mother glass and further added to the mother glass is the mole percent of each material contained per mol of the mother glass based on the mother glass and not the glass composition. (mol%), and the mole percent of the materials constituting the three-component based glass and the materials added to the three-component based glass per mol of the three-component based glass based on the glass composition and the three-component based glass other than the mother glass Mol% (mol%) of each substance contained.

The glass composition according to the present invention preferably contains the mother glass and the low-expansion ceramic filler, wherein the glass composition is 70 to 99% by weight of the mother glass and 1 to 30% by weight of the low-expansion ceramic filler based on the glass composition. There is a characteristic containing.

As described above, the mother glass of the glass composition for sealing a flat panel display panel of the present invention can be formed in a wider area than the above-described area, but according to the researches and tests of the applicants, stable glass formation is achieved when the glass is manufactured in the above-mentioned composition range. It is possible and has a desirable coefficient of thermal expansion.

The content of P ₂ O ₅ in the mother glass is preferably in the range of 30 to 70 mol% with respect to the mother glass. When the content of P ₂ O ₅ is less than 30 mol%, it is easy to crystallize, and the glass transition temperature and softening temperature are higher than 500 ° C., and thus cannot serve as a sealing material, whereas when it exceeds 70 mol%, glass formation is difficult. On the other hand, hygroscopicity is very high, and application as a sealing material becomes difficult.

In addition, the content of ZnO in the mother glass is preferably in the range of 10 to 60 mol% based on the mother glass. When the content of ZnO is less than 10 mol%, the coefficient of thermal expansion becomes high, making it difficult to encapsulate low expansion. On the other hand, when the content of ZnO exceeds 60 mol%, the crystal phase precipitates, and the glass transition temperature and softening point are increased. It does not play a role.

In addition, the content of Sb ₂ O ₃ in the mother glass is preferably in the range of 1 to 40 mol% based on the mother glass. Although the glass can be formed even when the content of Sb ₂ O ₃ is 0 mol%, the addition of Sb ₂ O ₃ at a level of 1 mol% is preferable in order to increase adhesiveness and increase the coefficient of thermal expansion. On the other hand, when the content of the Sb ₂ O ₃ exceeds 40 mol%, the possibility of crystallization is increased, the glass transition temperature and the softening point is accompanied by an increase in the low temperature sealing material is not possible.

The mother glass may include at least one first metal oxide selected from the group consisting of MgO, CaO, BaO, SrO and MnO; At least one second metal oxide selected from the group consisting of Li ₂ O, Na ₂ O, K ₂ O, Rb ₂ O, and Cs ₂ O; At least one third metal oxide selected from TiO ₂ , Al ₂ O ₃ and B ₂ O ₃ groups; Or a mixture thereof.

The first metal oxide selected from one or more of the alkaline earth metal oxides (MgO, CaO, BaO, SrO) and manganese oxide group strengthens the structure of the mother glass composition and enhances stability to increase water resistance and at the same time reduce the additional coefficient of thermal expansion. You can expect However, when the mother glass contains more than 15 mol% of the first metal oxide, the glass may become unstable.

The third metal oxide selected from one or more of the TiO ₂ , Al ₂ O ₃ and B ₂ O ₃ groups may further increase the chemical durability of the mother glass and further reduce the coefficient of thermal expansion, in particular, to increase the glass stability and crystallization Can be prevented. However, when the mother glass contains more than 15 mol% of the third metal compound, the instability of the mother glass may be increased such as to promote crystallization.

In order to increase the stability, water resistance, decrease the coefficient of thermal expansion, and prevent crystallization, the mother glass preferably contains 0.5 mol% or more of the first metal oxide, and 0.5 mol% or more of the third metal compound. It is desirable to.

The at least one second metal oxide selected from the groups Li ₂ O, Na ₂ O, K ₂ O, Rb ₂ O and Cs ₂ O further lowers the glass transition temperature of the mother glass and increases fluidity, which is advantageous for low temperature firing. have. However, when the mother glass contains more than 10 mol% of the second metal oxide, it may rather cause crystallization and inhibit flow.

In order to reduce the viscosity and the glass transition temperature, the mother glass preferably contains 0.1 mol% or more of the second metal oxide.

The glass transition temperature (Tg) of the mother glass is preferably 400 ° C. or less (300 to 400 ° C., 200 to 400 ° C. when containing V ₂ O ₅ ). If the glass transition temperature of the mother glass exceeds 400 ° C low temperature sealing is practically difficult. Further, in order to lower the firing process temperature, the glass transition temperature (Tg) of the mother glass is more preferably 350 ° C. or lower (300 to 350 ° C., 200 to 350 ° C. when containing V ₂ O ₅ ).

As described above, the glass composition according to the present invention preferably contains the mother glass and the low-expansion ceramic filler. The low-expansion ceramic filler further reduces the coefficient of thermal expansion of the mother glass to reduce the difference in the coefficient of thermal expansion with the glass substrate. As a function of overcoming, low expansion ceramic filler generally means a filler having an average coefficient of thermal expansion in the range of about −60 (minus 60) to about 40 × 10 ⁻⁷ / ° C. at about 300 ° C. at room temperature. .

Preferably, the low-expansion ceramic filler is cordierite (cordierite), silica (silica), eucryptite (eucryptite), alumina titanate (aluminum titanate), zircon, spodumene, willemite ( willemite, mullite, or mixtures thereof.

The glass composition for sealing a flat panel display panel of the present invention may contain only the mother glass without the addition of a low-expansion ceramic filler because the coefficient of thermal expansion of the mother glass is similar to that of the PDP glass substrate, but for sealing the low-expansion glass substrate, The glass composition preferably contains 70 to 99% by weight of the above-mentioned mother glass and 1 to 30% by weight of the low-expansion ceramic filler relative to the glass composition (based on the weight of the glass composition).

At this time, if the glass composition has a glass content of less than 70% by weight based on the weight of the glass composition, the flowability is lowered and the adhesiveness is remarkably reduced, and crystallization proceeds, thus making it difficult to seal the mother glass. It is preferable to contain more than%.

Glass composition according to the present invention is the mother glass; Or after mixing the mother glass and the low-expansion ceramic filler; and after firing, the average coefficient of thermal expansion in the range from room temperature to 300 ℃ has a characteristic of 35 to 90 x 10 ^-7 / ℃ range.

For example, the coefficient of thermal expansion can be adjusted to about 45 x 10 ^-7 / ℃ according to the addition of cordierite, the low-expansion ceramic filler to the glass composition according to the present invention, and the coefficient of thermal expansion as the silica, the low-expansion ceramic filler, is added Can be adjusted to about 35 × 10 ⁻⁷ / ° C.

The range of the coefficient of thermal expansion of the glass composition containing the low-expansion ceramic filler exhibits a value similar to the coefficient of thermal expansion with the low-expansion glass substrate constituting the flat panel display panel, and at the time of manufacturing the flat panel display panel or operating the flat panel display panel. The stress generated can be minimized to increase durability and reliability.

The glass composition according to the invention preferably contains V ₂ O ₅ , and when the glass composition of the invention contains V ₂ O ₅ , the glass composition for sealing flat panel displays according to the invention contains a mother glass and , The mother glass contains 40 to 95 mol% of three-component glass and contains 5 to 60 mol% of V ₂ O ₅ , the three-component glass does not contain lead (Pb), P ₂ O ₅ 30 To 70 mol%, ZnO 10 to 60 mol% and Sb ₂ O ₃ 1 to 40 mol%, the coefficient of thermal expansion is 55 to 90 x 10 ^-7 / ℃, the glass transition temperature is 300 ℃ to 400 ℃ There is this.

The vanadium pentoxide serves as a glass network forming agent to lower the glass transition temperature of the three-component (P ₂ O ₅ -ZnO-Sb ₂ O ₃ ) -based glass, improve the stability of the glass and at the same time reduce the coefficient of thermal expansion.

In order to reduce the glass transition temperature, the coefficient of thermal expansion and improve the stability, the mother glass preferably contains at least 5 mol% of vanadium pentoxide, more preferably at least 30 mol% of vanadium pentoxide. However, when the vanadium pentoxide content exceeds 60 mol%, the glass stability may be inhibited and a crystal phase may precipitate.

At this time, the three-component glass is at least one selected from the group of MgO, CaO, BaO, SrO and MnO metal oxide; At least one second metal oxide selected from the group consisting of Li ₂ O, Na ₂ O, K ₂ O, Rb ₂ O, and Cs ₂ O; At least one third metal oxide selected from TiO ₂ , Al ₂ O ₃ and B ₂ O ₃ groups; Or a mixture thereof. It is preferable to further contain.

In other words, when the glass composition according to the present invention contains vanadium pentoxide, the mother glass contains vanadium pentoxide and three-component glass, and the three-component glass is essential P ₂ O ₅ , ZnO and Sb ₂ O ₃ Containing, the first metal oxide; The second metal oxide; The third metal oxide; Or a mixture thereof; and optionally further.

The addition effect and the addition amount of the first metal oxide, the second metal oxide and the third metal oxide are similar to those described above, but are added to the three-component based glass instead of the entire mother glass.

Specifically, the three-component based glass has a 0.5 to 15 mole percent relative to the three-component based glass and has at least one first metal oxide selected from the group consisting of MgO, CaO, BaO, SrO and MnO; A second metal oxide having 0.1 to 10 mol% and at least one selected from the group of Li ₂ O, Na ₂ O, K ₂ O, Rb ₂ O, and Cs ₂ O; A third metal oxide having 0.5 to 15 mol% and at least one selected from the group of TiO ₂ , Al ₂ O ₃ and B ₂ O ₃ ; Or a mixture thereof.

Even when the glass composition according to the present invention contains vanadium pentoxide, the glass composition according to the present invention preferably further contains a low-expansion ceramic filler, and the glass composition is 70 to 99% by weight of the mother glass relative to the glass composition. It is preferable to contain 1-30 weight% of low expansion ceramic fillers. At this time, the role and material of the low-expansion ceramic filler is similar to that described above.

The phosphate-based glass composition for sealing a flat panel display according to the present invention is an environmentally friendly glass composition which does not contain lead components and does not have a problem of environmental pollution, and does not use rare earth elements, which requires low cost of materials and has improved glass stability. Borosilicate glass substrate, especially low expansion, because it has a low glass transition temperature of 400 ℃ or less to prevent thermal damage and can be sealed at a low temperature, and the thermal expansion coefficient is adjustable to have a low value of 35 to 90 x 10 ^-7 / ℃ There is an advantage that can effectively seal the display glass substrate.

(Example 1)

P ₂ O ₅  -ZnO-Sb ₂ O ₃ Glass composition

P ₂ O ₅ (high purity,> 3N), ZnO (high purity,> 3N) and Sb ₂ O ₃ (high purity,> 3N) are shown in each ternary state diagram of FIG. 1 (red dot of FIG. 1 or 2). After weighing by composition so as to have a composition corresponding to the), three-component mother glass was prepared by melting and quenching in an electric furnace at 1150 ° C. for 1 hour, and annealing for 300 ° C. for 1 hour, and then evaluating thermal characteristics. The glass transition temperature was measured using an aluminum cell from room temperature to 600 ° C. under a condition of 10 ° C. per minute using a differential scanning calorimeter (DSC-60A, Shimadzu, Japan). The coefficient of thermal expansion was measured using TMA (thermo-mechanical analyzer, TMA-60H, Shimazu Corporation, Japan) at 25 ° C and measuring the change in displacement from room temperature to 350 ° C or 400 ° C, depending on the glass composition, at 25 ° C. It was measured through the average rate of change up to 250 ℃.

The mother glass prepared in Example 1 confirmed the glass forming region as shown in Figure 1, it was confirmed that the glass transition temperature (T _g ) in the region capable of glass formation is 400 ℃ or less. On the other hand, the coefficient of thermal expansion of the mother glass prepared in Example 1 was found to be in the range of 80 to 100 x 10 ^-7 / ℃ as shown in FIG.

(Example 2)

Three-Component Glass Composition Containing Additives

The parent glass has 45 mol% P ₂ O _5, 45 mol% ZnO, 5 mol% Sb ₂ O ₃ and ₂ mol% B ₂ O ₃ (high purity> 3N), and 3 mol% CaO (high purity,> 3N), BaO After the mother glass was prepared similarly to Example 1 except that it was weighed to contain (high purity,> 3N) or MnO (high purity,> 3N), the thermal properties were evaluated.

In FIG. 3, PZS refers to a pure three-component system (45 mol% of P ₂ O _5, 45 mol% of ZnO, and 10 mol% of Sb ₂ O ₃ ) containing no additives, and CaO is a three-component system (45 mol of P ₂ O _5). %, ZnO 45 mol%, Sb ₂ O ₃ 5 mole%) to the base further comprises a B ₂ O ₃ 2 mol% and CaO 3 mol% glass, BaO is a three-component (P ₂ O ₅ 45 mole%, ZnO 45 Mori glass further contains 2 mol% of B ₂ O ₃ and 3 mol% of BaO in mol%, Sb ₂ O ₃ 5 mol%), and MnO is a three component system (45 mol% of P ₂ O _5, 45 mol% of ZnO, Sb ₂ O ₃ to B ₂ O 5 mole%) ₃ refers to a base glass further containing 2 mol% of MnO and 3% by mole.

As can be seen from the glass transition temperature and thermal expansion coefficient of the mother glass composition shown in Figure 3, the addition of MnO can obtain a mother glass composition having a thermal expansion coefficient of 75.8 x 10 ^-7 / ℃ and a glass transition temperature of about 390 ℃. there was.

(Example 3)

V ₂ O ₅ Glass composition containing

_{P 2 O 5: ZnO: Sb} 2 O ₃ and the molar ratio of 45:45:10 containing a ternary-based glass of 55 to 45 mol% of the total mother glass, so as to have the composition of each point shown in Figure 4 V ₂ The thermal properties were evaluated after the mother glass was prepared in a similar manner to Example 1 except that O ₅ (high purity,> 3N) was weighed to contain 45 to 55 mol% of the entire mother glass.

4 illustrates a part of the glass transition temperature and the coefficient of thermal expansion of the mother glass containing V ₂ O ₅ , as shown in FIG. 4, the glass transition temperature is 350 ° C. or less due to the addition of V ₂ O ₅ . Preferably it is lowered to 200 ℃ to 300 ℃, it can be seen that the coefficient of thermal expansion decreases below 70 x 10 ^-7 / ℃. In addition, if the amount of V ₂ O ₅ is more than 50 mol%, the coefficient of thermal expansion increases rather than 65 x 10 ^-7 / ℃, so that V ₂ O _{5 is} required to maintain the coefficient of thermal expansion at a level of 60 x 10 ^-7 / ℃. It can be seen that it is more preferable to keep the amount of 50 mol% or less.

(Example 4)

Glass Compositions Containing Additives

After the mother glass was prepared in the same manner as in Example 1, except that the composition was weighed to have the composition of glass 1 to glass 7 in Table 1 below, thermal properties were evaluated.

As shown in Table 1, it can be seen that as Al ₂ O ₃ or TiO ₂ is added, the increase in glass transition temperature is minimized and the coefficient of thermal expansion decreases. The coefficient of thermal expansion of the mother glass is about 55 x 10 ^-7 / It can be seen that it can be reduced to the level.

Table 1. Thermal Properties of Al ₂ O ₃ and TiO _{2 in} P ₂ O ₅ -Sb ₂ O ₃ -ZnO-V ₂ O ₅ Compositions (Composition: mol%)

Glass ZnO P ₂ O ₅ V ₂ O ₅ Sb ₂ O ₃ Al ₂ O ₃ TiO ₂ Glass transition temperature
(℃) Coefficient of thermal expansion
(x10 ^-7 / ℃) One 21.2 21.2 51.9 4.7 - One 317.1 63.8 2 20.7 20.7 51 4.6 - 3 321 62.9 3 20.3 20.3 49.9 4.5 - 5 323.2 54.5 4 21.2 21.2 51.9 4.7 One - 318 68.8 5 20.7 20.7 51 4.6 3 - 325.1 72 6 20.3 20.3 49.9 4.5 5 - 325.6 68.6 7 19.2 19.2 47.3 4.3 10 - 321.3 59.7

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Those skilled in the art will recognize that many modifications and variations are possible in light of the above teachings.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all of the equivalents or equivalents of the claims as well as the claims to be described later will belong to the scope of the present invention. .

FIG. 1 shows the glass forming region and glass transition temperature of the phosphate-zinc-antimony ternary composition (composition: mol%) of Example 1,

FIG. 2 shows the glass forming region and the coefficient of thermal expansion of the phosphoric acid-zinc-antimony ternary composition (composition: mol%) of Example 1,

FIG. 3 illustrates changes in glass transition temperature and coefficient of thermal expansion when CaO, BaO and MnO are added to the phosphate-zinc-antimony ternary composition of Example 2,

Figure 4 shows the glass transition temperature and thermal expansion coefficient change when V ₂ O ₅ is added to the phosphate-zinc-antimony ternary composition of Example 3.

Claims (10)

Glass composition for sealing flat panel displays containing mother glass, The mother glass is a ternary base glass containing no lead (Pb) and containing 41 to 70 mol% of P ₂ O ₅ , 10 to 60 mol% of ZnO and 1 to 40 mol% of Sb ₂ O ₃ , and a coefficient of thermal expansion. The glass composition for sealing flat panel displays is 55 to 90 × 10 ⁻⁷ / ° C., and glass transition temperature is 300 ° C. to 400 ° C. The method of claim 1, The mother glass may include at least one first metal oxide selected from the group consisting of MgO, CaO, BaO, SrO and MnO; At least one second metal oxide selected from the group consisting of Li ₂ O, Na ₂ O, K ₂ O, Rb ₂ O, and Cs ₂ O; At least one third metal oxide selected from TiO ₂ , Al ₂ O ₃ and B ₂ O ₃ groups; Or a mixture thereof. The glass composition for sealing flat panel displays, further comprising. 3. The method of claim 2, The mother glass is a glass composition for sealing a flat panel display containing 0.5 to 15 mol% of the first metal oxide relative to the mother glass. 3. The method of claim 2, The mother glass is a glass composition for sealing a flat panel display containing 0.1 to 10 mol% of the second metal oxide relative to the mother glass. 3. The method of claim 2, The mother glass is a glass composition for sealing a flat panel display containing 0.5 to 15 mol% of the third metal oxide relative to the mother glass. Glass composition for sealing flat panel displays containing mother glass, The mother glass contains 40 to 95 mol% of three-component glass and 5 to 60 mol% of V ₂ O ₅ , The three-component glass does not contain lead (Pb), and contains 41 to 70 mol% of P ₂ O ₅ , 10 to 60 mol% of ZnO and 1 to 40 mol% of Sb ₂ O ₃ , and has a coefficient of thermal expansion of 55 to 70 mol%. The glass composition for sealing flat panel displays which is 90x10 <^-7> / degreeC and glass transition temperature is 300 degreeC-400 degreeC. The method of claim 6, The three-component based glass has a 0.5 to 15 mol% relative to the three-component based glass and at least one metal oxide selected from the group MgO, CaO, BaO, SrO and MnO; A second metal oxide having 0.1 to 10 mol% and at least one selected from the group of Li ₂ O, Na ₂ O, K ₂ O, Rb ₂ O, and Cs ₂ O; A third metal oxide having 0.5 to 15 mol% and at least one selected from the group of TiO ₂ , Al ₂ O ₃ and B ₂ O ₃ ; Or a mixture thereof. The glass composition for sealing flat panel displays, further comprising. The method according to any one of claims 1 to 7, wherein The glass composition further comprises 70 to 99% by weight of the mother glass and 1 to 30% by weight of the low-expansion ceramic filler with respect to the glass composition. The method of claim 8, The low-expansion ceramic filler is cordierite, silica, silica, eucryptite, aluminum titanate, zircon, spodumene, willemite, mullite A glass composition for sealing flat panel displays, which is (mulite) or a mixture thereof. The method of claim 9, The glass composition for sealing a flat panel display having a thermal expansion coefficient of 35 to 90 × 10 ⁻⁷ / ° C. in a temperature range of 300 ° C. at room temperature of the glass composition.

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