KR20100058705A - Paste composition for offset printing and flat panel display device using the smae - Google Patents

Abstract

PURPOSE: A paste composition for offset printing and a flat panel display using thereof are provided to apply the composition for a mass production process and to improve a transfer property and printing accuracy. CONSTITUTION: A paste composition for offset printing contains 60~85wt% of conductive material, 2~10wt% of glass frit, 1~15wt% of organic binder, and the remaining balance of solvent. The organic binder is a copolymer including one repeating unit marked as -[CH2-C(R^1)(CO2R^2)]- and the other repeating unit marked as -[CH2-C(R^3)(CO2R^4)]-. In the repeating units, R^1 is either H or CH_3. R^2 is either alkyl with C14~C20 or aryl with C14~C20. R^3 is either H or CH_3. R^4 is either alkyl with C1~C12 or aryl with C6~C12.

Description

Offset printing paste composition and flat panel display device using same {PASTE COMPOSITION FOR OFFSET PRINTING AND FLAT PANEL DISPLAY DEVICE USING THE SMAE}

The present invention relates to a paste composition for offset printing, an electrode of a flat panel display device manufactured using the paste composition, and a flat panel display device including the electrode.

Recently, a plasma display panel (PDP), a liquid crystal display (LCD), a field emission display (FED) as a display device that can replace a cathode ray tube And various flat panel display devices such as electroluminescent (EL) display elements are in the spotlight.

As an electrode forming method of a conventional flat panel display device, the photolithography method has been generally used. Photolithography is a series of photolithography processes including application of photoresist, mask alignment, exposure, development, and strip, which takes a long time and wastes strip solution to remove photoresist and photoresist pattern. There is a problem that expensive equipment such as exposure equipment is required. In particular, it has been pointed out that as the size of the substrate increases and the size of the pattern decreases, the cost of the exposure equipment increases, and the control of the pitch precision and the control of the electrode width is disadvantageous.

Therefore, studies have been made on a pattern formation method in which harmful waste liquids and the like are not generated at low cost instead of the photolithography method. Among them, the offset printing method using the printing blanket made of silicone rubber has attracted attention as an alternative to photolithography because it is possible to form a thin line pattern of several tens to hundreds of micrometers in width.

The offset printing method is a printing method that is used for forming electrodes of a flat panel display device by using intaglio and / or embossment and using transfer characteristics of ink. In general, the offset printing method is divided into two processes, an off process and a set process. After the paste composition is filled on a printing roll having a pattern having a fine line width and depth before the off process, the printing roll is filled. A doctoring process is performed to scrape off the composition that has overflowed onto the bed. Thereafter, in the off-process, the blanket roll and the printing roll filled with the composition are sequentially pressed and rotated to transfer the composition filled in the printing roll groove to the blanket roll surface having the silicone rubber. In the set process, the surface of the silicone rubber blanket and the glass substrate are pressed while rotating to transfer the composition transferred onto the silicon blanket surface onto the glass substrate again.

However, even when the pattern is formed by the offset printing method using the silicone rubber blanket, there is a problem that the blanket swells, the affinity between the blanket for printing and the paste composition increases, the line width of the pattern increases, and the printing accuracy decreases. have.

In particular, the blanket roll rubber is damaged by UV (ultraviolet) radiation during UV (UV) irradiation during offset printing, which makes the continuous process impossible. The impossibility of the continuous process due to such damage of the blanket roll rubber is a very serious problem that greatly affects the expansion of the offset method.

In order to solve such a problem, Korean Laid-Open Patent Publication No. 2003-0096012 first applies a heating and drying treatment such as spraying warm air onto the surface of a blanket after ink transfer from a blanket for printing to a transfer object, and then the surface of the blanket. In order to lower the temperature, it is disclosed to perform a cooling treatment such as spraying cold air on the surface of the blanket. However, in this case, too, the swelling phenomenon of the blanket occurs, and there is a problem that the line width is reduced or the pattern shape is scattered by repeating the printing, and the economic effect due to the decrease in the production efficiency is insufficient due to the addition of drying and cooling processes after ink transfer. have. In addition, since the offset printing method of the UV type, as the number of prints increases, the time to be exposed to UV increases, thereby causing a problem that the blanket roll rubber is damaged.

The present invention seeks to provide a paste composition for offset printing comprising a novel organic binder instead of a conventional organic binder that causes swelling and protrusion failure of the blanket roll. In addition, the present invention is to provide a offset composition paste composition for preventing the swelling phenomenon of the blanket roll, the continuous process is possible, excellent transferability and printing accuracy, can be applied to the mass production process, the economic effect is large.

The present invention also provides an electrode of a flat panel display device manufactured using the offset printing paste composition and a flat panel display device including the electrode.

The present invention is a conductive material; Glass frit; Organic binders; And a solvent, wherein the organic binder is a repeating unit represented by-[CH ₂ -C (R ¹ ) (CO ₂ R ² )]-, wherein R ¹ is H or CH ₃ ; R ² is C ₁₄ ~ aryl of C ₂₀ alkyl or C ₁₄ - C ₂₀ in) and a ^{_{- [CH 2 -C (R 3}} ) (CO 2 R 4)] - repeating unit represented by (wherein, R ³ is H or CH _3, and; R ⁴ is an offset printing paste composition characterized by being a copolymer comprising C ₁ -C ₁₂ alkyl or C ₆ -C ₁₂ aryl). It is preferable that the paste composition of this invention is a non-UV type offset printing paste composition.

The present invention also provides an electrode of a flat panel display device manufactured using the paste composition for offset printing and a flat panel display device including the electrode.

The offset printing paste composition according to the present invention prevents the swelling phenomenon of the blanket roll to enable a continuous process, excellent transferability and printing accuracy, and can be applied to a mass production process, thereby having a large economic effect. Therefore, when the offset printing method using the paste composition according to the present invention is introduced in place of the conventional photolithography method when forming a pattern of an electrode, a black metrix, a PCB, etc., which requires a fine pattern, the material cost is reduced and the number of processes is shortened. And increase in production efficiency.

The offset printing paste composition of the present invention comprises a conductive material; Glass frit; Organic binders; And a solvent, wherein the organic binder is a repeating unit represented by-[CH ₂ -C (R ¹ ) (CO ₂ R ² )]-, wherein R ¹ is H or CH ₃ ; R ² is C ₁₄ ~ aryl of C ₂₀ alkyl or C ₁₄ - C ₂₀ in) and a ^{_{- [CH 2 -C (R 3}} ) (CO 2 R 4)] - repeating unit represented by (wherein, R ³ is H or CH _3, and; R ⁴ is a copolymer comprising C ₁ -C ₁₂ alkyl or C ₆ -C ₁₂ aryl). It is preferable that the paste composition of this invention is a non-UV type offset electrode paste composition.

The offset printing paste composition of the present invention is a repeating unit represented by-[CH ₂ -C (R ¹ ) (CO ₂ R ² )]-as an organic binder, wherein R ¹ is H or CH ₃ ; R ² is C _{Alkyl of 14} to C ₂₀ or aryl of C ₁₄ to C ₂₀ ) and a repeating unit represented by-[CH ₂ -C (R ³ ) (CO ₂ R ⁴ )]-, wherein R ³ is H or CH ₃ R ⁴ contains a copolymer containing C ₁ -C ₁₂ alkyl or C ₆ -C ₁₂ aryl), thereby preventing polymer adsorption of the blanket roll rubber to prevent swelling of the blanket roll. In addition, by controlling the rheology (rheology, flow characteristics) of the organic binder, it is possible to suppress protrusion defects, thereby improving the excellent transferability and printing precision of the paste composition, and realizing more than 500 continuous printing characteristics.

In addition, the offset printing method of the UV type of the offset printing method may increase the time to be exposed to UV as the number of prints increases, thereby causing a problem that the blanket roll rubber is damaged. However, since the paste composition of the present invention does not include a photoinitiator, it can be applied to a non-UV type offset printing method, and therefore, there is no problem of damage of blanket roll rubber by UV.

Paste composition of the present invention is 60 to 85% by weight of the conductive material; Glass frit 2-10 wt%; 1 to 15 wt% organic binder; And the remaining amount may include a solvent, preferably 75 to 85% by weight of the conductive material; 2-5 wt.% Glass frit; 5-12 wt% of organic binder; And the solvent as a residual amount.

In the paste composition of the present invention, the organic binder is a repeating unit represented by-[CH ₂ -C (R ¹ ) (CO ₂ R ² )]-, wherein R ¹ is H or CH ₃ ; R ² is C A repeating unit represented by ₁₄ to C ₂₀ alkyl or C ₁₄ to C ₂₀ aryl and-[CH ₂ -C (R ³ ) (CO ₂ R ⁴ )]-, wherein R ³ is H or CH ₃ R ⁴ is a copolymer comprising C ₁ -C ₁₂ alkyl or C ₆ -C ₁₂ aryl).

The content of the organic binder is 1 to 15% by weight of the total paste composition, preferably 5 to 12% by weight. If the content of the organic binder is less than 1% by weight, it is not easy to transfer in the off process and the set process, and a conductive material such as silver powder may precipitate easily. In addition, the conductivity of the electrode may be reduced.

In the paste composition of the present invention, it is preferable that the copolymer as the organic binder does not include -OH, -NH and -SH groups. When functional groups, such as -OH, -NH, -SH, exist in a copolymer, these functional groups will hydrogen bond with -OH of the silicone rubber surface of a blanket roll, and will attract | pulminate each other well. As a result, penetration of the organic binder into the silicone rubber of the blanket roll may be facilitated, and swelling of the blanket roll may occur, and thus a change in the pattern width may occur.

In addition, the content of the repeating unit represented by-[CH ₂ -C (R ¹ ) (CO ₂ R ² )]-in the copolymer and-[CH ₂ -C (R ³ ) (CO ₂ R ⁴ )] The content of the repeating unit represented by-may be 50 to 80% by weight and 20 to 50% by weight, respectively.

In addition, in the repeating unit represented by-[CH ₂ -C (R ¹ ) (CO ₂ R ² )]-, R ² is C ₁₄ -C ₂₀ alkyl or C ₁₄ -C ₂₀ aryl, wherein If the carbon number of alkyl or aryl is less than 14, the drying and flow characteristics of the paste composition are insufficient, so that continuous printing is difficult. If the carbon number is more than 20, the flow characteristics of the paste composition are excessive, resulting in a pattern spreading when set. As a result, the pattern width increases, which is undesirable.

As the organic binder, the copolymer is a (meth) acrylate represented by CH ₂ = C (R ¹ ) (CO ₂ R ² ), wherein R ¹ is H or CH ₃ ; R ² is C ₁₄ to C ₂₀ Alkyl or C ₁₄ -C ₂₀ aryl) at least one; And (meth) acrylate represented by CH ₂ = C (R ³ ) (CO ₂ R ⁴ ) wherein R ³ is H or CH ₃ ; R ⁴ is C ₁ -C ₁₂ alkyl or C ₆ -C ₁₂ aryl) may be a copolymer with one or more kinds. At this time, one or more (meth) acrylates represented by CH ₂ = C (R ¹ ) (CO ₂ R ² ) and (meth) acryl represented by CH ₂ = C (R ³ ) (CO ₂ R ⁴ ) One or more of the rates may be used in a ratio of 50 to 80% by weight: 20 to 50% by weight.

Preferably, the copolymer is (meth) represented by CH ₂ = C (R ¹ ) (CO ₂ R ² ), wherein (i) R ¹ is H or CH ₃ and R ² is alkyl of C ₁₄ to C ₂₀ 50-80% by weight of at least one acrylate (ie, C ₁₄ -C ₂₀ alkyl acrylate or C ₁₄ -C ₂₀ alkyl methacrylate); And (ii) a (meth) acrylate represented by CH ₂ = C (R ³ ) (CO ₂ R ⁴ ) where R ³ is H or CH ₃ and R ⁴ is alkyl of C ₁ to C ₁₂ (ie, C ₁ - the alkyl methacrylate of a C ₁₂ alkyl acrylate or C ₁ - C ₁₂₎ a copolymer of at least one 20 to 50% by weight.

For example, as the organic binder, the copolymer is stearyl methacrylate (SMA) as alkyl (meth) acrylate of C ₁₄ to C ₂₀ , and alkyl (meth) acrylate of C ₁ to C ₁₂ . It may be a copolymer with ethylhexyl acrylate (EHA, ethylhexyl acrylate), butyl methacrylate (BMA, butyl methacrylate) and methyl methacrylate (MMA, methyl methacrylate), but is not particularly limited thereto.

In the paste composition of the present invention, the conductive material is selected from the group consisting of silver (Ag), gold (Au), platinum (Pt), copper (Cu), palladium (Pd), aluminum (Al) and nickel (Ni). It may be one or more metals or alloys thereof, but is not limited thereto. In addition, the conductive material may be used in powder form, the diameter of which is not particularly limited. Preferably silver powder can be used.

The content of the conductive material is 60 to 85% by weight of the total paste composition, preferably 75 to 85% by weight. When the content of the conductive material is less than 60% by weight, it is difficult to sufficiently secure the conductivity of the electrode. When the content of the conductive material exceeds 85% by weight, the transfer may not be performed well during offset printing, and the thickness of the electrode may be too thick.

In the paste composition of the present invention, the glass frit may serve to improve plasticity of the conductive material in the firing process and to impart adhesion between the conductive material and the substrate.

The glass frit is PbO-SiO ₂ based, PbO-B ₂ O ₃ -SiO ₂ based, ZnO-SiO ₂ based, ZnO-B ₂ O ₃ -SiO ₂ based, Bi ₂ O ₃ -SiO ₂ based and Bi ₂ O _It may be one or more selected from the group consisting of ₃ -B ₂ O ₃ -SiO ₂ system, but is not limited thereto.

The glass frit may have an average particle diameter of 10 μm or less, and preferably 5 μm or less. When the average particle diameter of glass frit exceeds 10 micrometers, an electrode pattern may be nonuniform and pattern straightness may fall.

In addition, it is preferable that the said glass frit has a softening point of 450-550 degreeC. If the softening point of the glass frit is less than 450 ° C., bubbles are generated and pores are formed to increase resistance, and if it is more than 550 ° C., problems of adhesion may occur.

The content of the glass frit is 2 to 10% by weight of the total paste composition, preferably 2 to 5% by weight. If the content of the glass frit is less than 2% by weight, the firing of the conductive material may not occur properly, and the adhesion between the electrode pattern and the substrate may be reduced after firing. If the content of the glass frit exceeds 10%, the resistance of the electrode pattern may be increased. Can be.

In the paste composition of the present invention, a solvent capable of dissolving an organic binder may be an organic solvent having a boiling point of 100 to 350 ° C, preferably a boiling point of 150 to 200 ° C. If the boiling point of the solvent is less than 100 ° C, the doctoring and off characteristics are poor, and if it exceeds 350 ° C, the set characteristics are poor. In addition, the solvent may be a mixture of two or more organic solvents having different boiling points (volatile), it can exhibit a smooth offset characteristics, it has the advantage for drying it can give excellent continuous printing properties.

Preferably, the solvent is a mixture of two or more organic solvents having different boiling points, and each of the organic solvents has a boiling point of 100 to 350 ° C. At this time, the low boiling point organic solvent: the high boiling point organic solvent is preferably 1: 9 to 5: 5 by weight. If the weight ratio of the low boiling point solvent in the mixed solvent is less than 1, the set characteristics are poor, and if the weight ratio of the low boiling point solvent is 5 or more, the paste composition is easily dried, resulting in poor off characteristics and poor pattern straightness.

The content of the solvent in the paste composition of the present invention is not particularly limited, and may be included in an amount that adjusts the total paste composition to 100% by weight.

The solvent may be selected from the group consisting of alcohols, glycols, polyols, glycol ethers, glycol ether esters, and esters. It is not limited to this.

Non-limiting examples of the solvent include propylene glycol dimethyl ether, ethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, ethylene glycol diacetate, ethylene glycol monoethyl ether, diethylene glycol methyl ethyl ether, tripropylene glycol methyl ether , Diethylene glycol monobutyl ether, terpineol normal, diethylene glycol ethyl ether, 2,3-epoxypropyl ester, polyethylene glycol ethyl ether, polyethylene glycol butyl ether, diethylene glycol monobutyl ether acetate, ethylene Glycol diglycidyl ether, 2-ethylhexyl glycidyl ether, glycerin diacetate, glycerol triacetate, tetraethylene glycol dimethyl ether, texanol, polypropylene glycol diglycidyl ether, and the like.

The paste composition of the present invention may further include other additives in addition to the above-described components. Non-limiting examples of the additives include sensitizers to improve sensitivity; Antioxidants; Antifoaming agents that reduce bubbles in the photosensitive paste; Dispersants for improving dispersibility; Release agents for improving transferability in printing such as dimethylpolysiloxane or fluoro modified polyacrylate; Plasticizers for controlling solubility of organic binders in solvents; pH regulators; And thixotropic agents such as silicon oxide and magnesium, and these may be used alone or in combination of two or more thereof. In addition, the content of each additive is not particularly limited, but may be included in 0.01 to 2% by weight of the total paste composition. If the content of the additive is less than 0.01% by weight, problems may occur in thixotropy, adhesiveness, mold release property, etc., in the case of more than 2% by weight, electrical properties are deteriorated by residues during firing, and problems such as thixotropy and adhesion Can be generated.

In addition, the present invention provides an electrode of a flat panel display device manufactured using the above-described offset printing paste composition according to the present invention, and further provides a flat panel display device including the electrode. Non-limiting examples of the flat panel display include a plasma display panel (PDP), a liquid crystal display (LCD), a field emission display (FED), and an electroluminescence (Electro Luminescence) EL) display elements and the like, and a plasma display panel is preferable.

In the present invention, the electrode manufacturing process of the flat panel display device is not particularly limited and may be in accordance with conventional methods known in the art. Preferably according to the offset printing method. Examples of the electrode manufacturing process according to the offset printing method, the process of printing an electrode pattern on a substrate using an offset printing machine; And it may be made simpler than the conventional including the process of firing the fine pattern at 450 ~ 650 ℃ in an electric firing furnace, etc., but is not limited to such a manufacturing process.

Hereinafter, the present invention will be described in detail with reference to the following Examples. However, the following examples are merely to illustrate the present invention and the present invention is not limited by the following examples.

(Examples 1-3)

According to the composition ratio shown in Table 1, EHA / BMA / MMA / SMA (C18) copolymer (weight average molecular weight 20,000) was converted to DPGME (dipropylene glycol monoethyl ether): PGDE (propylene glycol dimethyl ether) = 2: 8 (weight ratio) Mixed with a solvent. To this, silver powder (spherical specific surface area 1.04 m 2 / g, D50 = 1.06 µm, D10 = 0.44 µm, D90 = 1.58 µm) and glass frit (B ₂ O ₃ -SiO ₂ system Dmax = 3.54 µm amorphous) were added and stirred. Afterwards, a paste composition for offset printing was prepared by kneading using a 3-roll mill.

Here, the EHA / BMA / MMA / SMA (C18) copolymer is 20% by weight EHA (2-ethylhexyl acrylate), 20% by weight BMA (butyl methacrylate), 10% by weight MMA (methyl methacrylate), and SMA (stearyl methacrylate) A composition containing a monomer mixture, AIBN and a solvent composed of 50% by weight was obtained by polymerization under the conditions of 70 to 130 ° C., a stirring speed of 200 to 1000 rpm, and a reaction time of 6 to 24 hours.

(Comparative Examples 1 and 2)

In accordance with the composition ratio shown in Table 1 below to prepare a paste composition for offset printing in the same manner as in Example 1. At this time, the organic binder in Comparative Example 1 EHA / BMA / MMA obtained by polymerizing a monomer mixture consisting of 20% by weight EHA (2-ethylhexyl acrylate), 20% by weight BMA (butyl methacrylate) and 60% by weight MMA (methyl methacrylate) In Comparative Example 2, the organic binder was 10% by weight EHA (2-ethylhexyl acrylate), 10% by weight BMA (butyl methacrylate), 30% by weight MMA (methyl methacrylate), 35% by weight SMA (stearyl methacrylate), AA (Ery / BMA / MMA / SMA / acrylic acid) / methacrylic acid (MAA) copolymer obtained by polymerizing a monomer mixture composed of 5% by weight (acrylic acid) and 10% by weight of MAA (methacrylic acid).

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Silver powder 75 wt% 82 wt% 84 wt% 82 wt% 82 wt% Glass frit 4 wt% 4 wt% 4 wt% 4 wt% 4 wt% Organic binder 10.5 wt%
Copolymer of EHA / BMA / MMA / SMA (C18) 7 wt%
Copolymer of EHA / BMA / MMA / SMA (C18) 6 wt%
Copolymer of EHA / BMA / MMA / SMA (C18) 7 wt%
Copolymer of EHA / BMA / MMA 7 wt%
Copolymer of EHA / BMA / MMA / SMA (C18) / AC (acrylic acid) / MAA (methacrylic acid) menstruum 10.5 wt%
DPGME + PGDE 7 wt%
DPGME + PGDE 6 wt%
DPGME + PGDE 7 wt%
DPGME + PGDE 7 wt%
DPGME + PGDE

(Performance evaluation examination)

After using the paste composition prepared in Examples 1 to 3 and Comparative Examples 1 and 2 to prepare the electrode under the following process conditions, the characteristics were evaluated according to the following evaluation criteria. In addition, the evaluation result is described in Table 2.

1) Printing: The electrode pattern was printed on the glass substrate using an offset printing machine.

2) Firing: The firing was carried out at 570 ° C. for 10 minutes using an electric firing furnace.

3) Measuring the width of the fired film: After firing using a film thickness measuring instrument, the thickness and width of the film was measured.

[Evaluation standard]

i) off, set process

Excellent: no pattern short circuit

Good: Slight pattern short

Poor: Many pattern shorts.

ii) straightness of electrode (evaluation line width: 100 microns)

Excellent: Line width changes within 1 micron after 300 consecutive prints

Good: Line width changes within 3 microns after 300 consecutive prints

Insufficient: Line width change over 5 microns after 300 consecutive prints

iii) residual amount of blanket rubber on the set (swelling phenomenon)

Excellent: 100% transitioned

Good: small amount of residue left

Insufficient: A large amount of residue left

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Continuous printing More than 300 times More than 300 times More than 300 times 50 times or less 200 times or less Specific resistance (10 ^-6 Ωcm) 3.2 2.4 2.4 8.2 4.5 Off characteristics Great Great Good Inadequate Good Three characteristics Great Great Great Great Inadequate Plastic thickness 4㎛ 4㎛ 4㎛ 2.5 μm 3.0 μm Straightness Great Great Great Inadequate Inadequate Rubber phase residual amount
(Swelling Suppression) Great Great Great Great Inadequate

1 is a photograph of the electrode pattern using the paste composition prepared in Example 2, Figure 2 is a photograph of the electrode pattern using the paste composition prepared in Comparative Example 1. 1 and 2, the upper portion is a plan view of the electrode pattern, and the lower portion is a sectional view of the electrode pattern.

According to FIG. 1, the edge portion of the pattern is sharp and printed without thickness variation between the edge portion and the center. Therefore, when offset printing using the paste composition of Example 2, the drying phenomenon of the paste composition did not occur it can be seen that the off (set) and (set) was well made. On the other hand, according to Figure 2, it can be seen that the edge (edge) is not sharp (sharp), the thickness variation between the edge portion and the center is large. Therefore, when offset printing using the paste composition of Comparative Example 1, it can be seen that the drying phenomenon of the paste composition occurs and a problem occurs when off (off).

In addition, according to Table 2, the case of using the paste composition of Examples 1 to 3 was superior to the case of using the paste composition of Comparative Examples 1 to 2, the suppression of the swelling phenomenon of the blanket rubber, the specific resistance was reduced As a result, a pattern with a thick thickness and a fine line width was formed with high precision and uniformity.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

1 is a photograph of an electrode pattern using the paste composition prepared in Example 2.

2 is a photograph of an electrode pattern using the paste composition prepared in Comparative Example 1.

Claims (13)

Conductive material; Glass frit; Organic binders; And a solvent, The organic binder is a repeating unit represented by-[CH ₂ -C (R ¹ ) (CO ₂ R ² )]-(wherein R ¹ is H or CH ₃ ; R ² is C ₁₄ -C ₂₀ alkyl or Aryl of C ₁₄ to C ₂₀ ) and a repeating unit represented by-[CH ₂ -C (R ³ ) (CO ₂ R ⁴ )]-, wherein R ³ is H or CH ₃ ; R ⁴ is C _1- aryl of C ₁₂ alkyl or C ₆ ~ C ₁₂ of) a copolymer is characterized by an offset printing paste composition comprising a. The paste composition of claim 1, wherein the copolymer does not include -OH, -NH, and -SH groups. According to claim 1, 60 to 85% by weight of the conductive material; Glass frit 2-10 wt%; 1 to 15 wt% organic binder; And a solvent as a residual amount. The content of the repeating unit represented by-[CH ₂ -C (R ¹ ) (CO ₂ R ² )]-in the copolymer and-[CH ₂ -C (R ³ ) (CO ₂ R ⁴ )]-The content of the repeating unit represented by the offset printing paste composition, characterized in that 50 to 80% by weight and 20 to 50% by weight, respectively. The method of claim 1, wherein the copolymer is _{(i) CH 2 = C (} R 1) (CO 2 R 2) ( meth) represented by the acrylate (wherein, R ¹ is H or CH _3, and; R ² is C ₁₄ -C ₂₀ alkyl or C ₁₄ -C ₂₀ aryl) one or more; And (ii) a (meth) acrylate represented by CH ₂ = C (R ³ ) (CO ₂ R ⁴ ), wherein R ³ is H or CH ₃ ; R ⁴ is C ₁ -C ₁₂ alkyl or C ₆ to C ₁₂ aryl) Offset printing paste composition, characterized in that at least one copolymer. The method of claim 1, wherein the copolymer is stearyl methacrylate (SMA, stearyl methacrylate), ethylhexyl acrylate (EHA, ethylhexyl acrylate), butyl methacrylate (BMA, butyl methacrylate) and methyl methacrylate (methyl) Offset printing paste composition characterized in that the copolymer of (methacrylate). The method of claim 1, wherein the conductive material is selected from the group consisting of silver (Ag), gold (Au), platinum (Pt), copper (Cu), palladium (Pd), aluminum (Al) and nickel (Ni). An offset printing paste composition characterized by at least one metal or an alloy thereof. The glass frit of claim 1, wherein the glass frit is PbO-SiO ₂ based, PbO-B ₂ O ₃ -SiO ₂ based, ZnO-SiO ₂ based, ZnO-B ₂ O ₃ -SiO ₂ based, Bi ₂ O ₃ -SiO _A paste composition for offset printing, characterized in that at least one selected from the group consisting of a _two- system and a Bi ₂ O ₃ -B ₂ O ₃ -SiO ₂ system. The paste composition for offset printing according to claim 1, wherein the solvent is a mixture of two or more organic solvents having different boiling points, and each of the organic solvents has a boiling point of 100 to 350 ° C. The paste composition of claim 1, further comprising one or more selected from the group consisting of sensitizers, antioxidants, antifoams, dispersants, mold release agents, plasticizers, pH adjusters, and thixotropic agents. The paste composition for offset printing according to claim 1, which is for offset printing of Non-UV type. An electrode of a flat panel display device manufactured using the paste composition for offset printing according to any one of claims 1 to 11. A flat panel display comprising the electrode according to claim 12.

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