TWI471339B - Paste composition for printing - Google Patents

Description

Paste composition for printing Field of invention

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a paste composition for printing, and more particularly to a paste composition for printing which is particularly suitable for gravure offset printing, which can be solved by using conventional photolithography. The material reprocessing problem that occurs when shielding the screen filter electrode for electromagnetic waves or the electrode pattern for the power supply slurry display, and at the same time, satisfies various characteristics required as a paste composition, each of which is printed Those who are procedurally needed to achieve proper offset performance.

Background of the invention

Recently, as display displays have increased in demand for large size, high density, high accuracy, and high reliability, several pattern processing techniques have been developed, and with respect to forming fine electrodes, various pattern processing techniques can be applied. Studies of various compositions have been actively conducted.

Compared with liquid crystal panels, plasma display panels (PDPs) can now be used in various fields due to their rapid response rate and easy fabrication into large sizes. In general, a method of patterning an electrode material using screen printing has been used to form an electrode on a PDP. However, the conventional screen printing method requires a high level of technology. In the screen printing, the paste composition may run out of the substrate due to its low viscosity, which causes the screen accuracy to be lowered, resulting in conventional screen printing. It is difficult to obtain a large-scale screen pattern of high precision required for PDP. In addition, the conventional screen printing method may cause defects or holes in the screen when printing.

Recently, photolithographic etching techniques using photosensitive resin compositions have been developed to form highly accurate electrode circuits suitable for large areas. These methods are carried out by forming a film of a uniform thickness on which a fine conductive powder is dispersed by using a photosensitive resin composition printing method, and exposing the formed film to light using a mask having a desired configuration, and The desired pattern is then developed using an alkaline developing solution.

However, when the pattern is formed by the photolithography method described above, in order to save manufacturing costs, the material to be removed during the development process needs to be reprocessed, and there is much debate in progress.

In order to solve the above problems, a method for directly forming a desired pattern on a substrate, such as a gravure offset printing method or an inkjet printing method which has been widely used in the printing industry, has been studied.

Summary of invention

The object of the present invention is to solve the above problems of the prior art, and to provide a paste composition for printing, which is particularly suitable for a gravure offset printing mode, and can be used for forming a power supply slurry display panel by using a conventional photolithography method. When the electrode pattern for the screen filter of the electromagnetic wave is shielded, the problem that the material removed during the development process needs to be reprocessed is solved to save the manufacturing cost, and a method for forming the electrode of the plasma panel display under the use of the above paste composition is provided. Or a method of preparing an electrode for shielding a screen filter for electromagnetic waves.

Further, another object of the present invention is to provide a paste composition for printing which satisfies various characteristics required as a composition, each of which is required for a printing process and thus can be suitably used. An offset printing performance, and a method of forming an electrode of a plasma panel display or a method of preparing an electrode for shielding a screen filter for electromagnetic waves, using the above paste composition.

In order to achieve the above object, the present invention provides a paste composition for printing comprising: a) 5 to 30 wt% of an acrylic polymer resin; b) 5 to 35 wt% of a high boiling point solvent, a boiling point of at least 200 ° C; c) 5 to 35 wt% of a low boiling point solvent having a boiling point of less than 200 ° C; and d) 50 to 85 wt % of metal powder.

Further, the present invention provides a method of forming a plasma panel display electrode comprising forming a pattern by using the above-described paste composition for printing by gravure offset printing.

Further, the present invention provides a method of forming an electrode for shielding a screen filter for electromagnetic waves, which comprises forming a pattern by using the above-described paste composition for printing by gravure offset printing.

Simple illustration

Fig. 1 is a photograph showing the minimum line width after gravure offset printing, which was prepared using a paste composition for printing according to an embodiment of the present invention and a comparative example.

Detailed description of the preferred embodiment

The invention will be described in further detail.

The inventors have found that in order to facilitate the preparation of a paste composition for gravure offset printing which satisfies the properties of the composition required for various printing procedures, an acrylic polymer having an appropriate molecular weight is used to exert a moderate elastic property required in an OFF mode. And using a suitable volatile solvent to provide excellent calcination characteristics in a set (SET) mode, as a result, a paste composition suitable for printing for gravure offset printing can be prepared, and thus the present invention has been completed.

The paste composition for printing of the present invention comprises a) 5 to 30% by weight of an acrylic polymer resin; b) 5 to 35 wt% of a high boiling solvent having a boiling point of at least 200 ° C; c) 5 to 35% by weight a low boiling point solvent having a boiling point of less than 200 ° C; and d) 50 to 85% by weight of the metal powder.

As the acrylate polymer resin used in a) of the present invention, a conventional acrylate polymer resin can be used, and preferably, it can be polymerized by unsaturated carboxylic acid monomer, aromatic monomer and other singles. Body preparation.

The function of the unsaturated carboxylic acid monomer is to increase the elasticity of the polymer via hydrogen bonding in the polymer, and in particular, acrylic acid, methacrylic acid, itaconic acid, maleic acid, and antibutene can be used. Diacid, vinyl acetate, its mono-acid anhydride form, and the like.

Preferably, the unsaturated carboxylic acid monomer is contained in an amount of 20 to 50% by weight based on the total monomers used in the preparation of the acrylic polymer resin, and when the content is within the above range, the elastic properties of the polymer The prevention of gelation during polymerization and the control of the degree of polymerization are satisfactory.

The function of the aromatic monomer is to form a close adhesion and stable pattern on the substrate; in particular, styrene, benzyl methacrylate, Benzyl acrylate, phenyl acrylate, phenyl methacrylate, phenyl 2-nitroacrylate, phenyl 4-nitroacrylate, phenyl 2-nitromethyl methacrylate, phenyl 4-nitromethyl methacrylate, Benzyl 2-nitromethyl methacrylate, benzyl 4-nitromethyl methacrylate, phenyl 2-chloroacrylate, phenyl 4-chloroacrylate, phenyl 2-chloromethyl methacrylate, benzene 4-chloromethyl acrylate Ester and the like.

Preferably, the aromatic monomer is contained in an amount of 10 to 30% by weight, more preferably 15 to 20% by weight, based on the total of monomers used in the preparation of the acrylic polymer resin. When the content is within the above range, the adhesion to the substrate, the adhesion strength of the pattern, the directionality of the formed pattern, the formation of a stable pattern, and the ease of removal during calcination are satisfactory.

In addition to the unsaturated carboxylic acid monomer and the aromatic monomer, other monomers used in the preparation of the acrylic polymer resin function to control the glass transition temperature and the polarity of the polymer.

For these other monomers, 2-hydroxyethyl (meth) acrylate, 2-hydroxyoctyl (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, or n-butyl can be used. The acrylate, and the like, preferably contained in an amount of 20 to 60 wt% of the total monomers used in the preparation of the acrylic polymer resin in view of the close adhesion of the polymer to the substrate, heat resistance and glass transition temperature. % is preferred.

The acrylic polymer resin can be prepared by polymerizing the above monomer in the presence of a solvent, thereby preventing gelation of the unsaturated carboxylic acid monomer, aromatic monomer and other monomers, and can be in the offset printing process. Control the appropriate volatility.

In terms of solvent, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, propylene glycol monomethyl propionate, diethyl ether propionate, terpineol, propylene glycol monomethyl ether acetate, dimethyl amino formaldehyde, Methyl ethyl ketone, butyl carbitol, butylcarbitol acetate, γ -butyrolactone, or ethyl lactate may be used singly or in combination.

The acrylic polymer resin obtained by the polymerization of the above monomers in the presence of a solvent preferably has an average molecular weight of from 10,000 to 100,000, more preferably from 20,000 to 50,000. When the average weight molecular weight falls within the above range, the fluidity of the polymer due to the low glass transition temperature of the polymer resin in the OFF mode can be simultaneously solved, and the pattern is transferred from the gravure of the gravure offset to the tape. There may be a problem of difficulty, and the injection of the composition into the intaglio groove may be difficult due to the excessive elastic properties of the polymer resin.

The content of the acrylic polymer resin is preferably from 5 to 30% by weight of the paste composition for printing of the present invention. When the content is less than 5 wt%, there may be a problem in the OFF mode due to a decrease in the elasticity of the composition, and when the content exceeds 30 wt%, the resistance of the formed pattern may increase.

Further, the present invention encompasses the high boiling point solvent having a boiling point of at least 200 °C. The high boiling point solvent is not limited to a specific solvent as long as it has a boiling point of 200 ° C or higher, and in particular, γ -butyrolactone, butyl ketobutrol, vinyl, methoxy, and methoxy can be used. Ethyl ether propionate and terpineol.

Preferably, the high boiling solvent is from 5 to 35 wt% of the paste composition for printing of the present invention. When the content is less than 5 wt%, the flow rate of the solvent becomes very fast, and thus the pattern is not easily transferred in the OFF mode of the printing process, and when the content exceeds 35 wt%, since it is difficult to control the offset printing process The flow of the composition in the SET mode, therefore, the directionality of the pattern is lowered, and the phenomenon of pattern enlargement during printing is deteriorated.

Further, the present invention contains a low boiling point solvent having a boiling point of less than 200 °C.

The low boiling point solvent is not limited to a specific solvent as long as its boiling point is lower than 200 ° C, and in particular, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, propylene glycol monomethyl propionate, diethyl ether propionate, propylene glycol can be used. Monomethyl ether acetate, methyl ethyl ketone and ethyl lactate.

Preferably, the low boiling point solvent is present in an amount of from 5 to 35 wt% of the paste composition for printing of the present invention. When the content is less than 5 wt%, since it is difficult to control the flow of the composition in the SET mode of the offset printing process, the directivity of the pattern is lowered, and the phenomenon of pattern enlargement at the time of printing is deteriorated. When the content exceeds 35 wt%, the flow rate of decrease becomes very fast, and thus the pattern is not easily transferred in the OFF mode of the printing process.

Preferably, the combined amount of the high boiling point solvent b) and the low boiling point solvent c) is 40% by weight or less of the paste composition for printing of the present invention. When the content exceeds 40% by weight, the viscosity of the paste is lowered and the printing efficiency may be deteriorated. Further, it is preferred to control the viscosity of the final paste composition for offset printing to be in the range of 5,000 to 20,000 cP by appropriately mixing a volatile solvent having a high boiling point solvent and a low boiling point solvent.

The metal powder used in the d) of the present invention is not limited to a specific metal as long as it can be used for the formation of an electrode of a PDP electrode or a screen filter for shielding electromagnetic waves, and in particular, silver, copper, nickel or Contains alloys such as these.

Preferably, the content of the metal powder is from 50 to 85 wt% of the paste composition for printing of the present invention. When the content is less than 50% by weight, the performance required for the electrode and the electromagnetic shielding effectiveness are deteriorated due to an increase in the resistance of the formed pattern, and when the content exceeds 85 wt%, the viscosity of the composition increases and becomes variable. It is difficult to spread, so the printing performance will deteriorate.

Further, the paste composition for printing of the present invention may further comprise a dispersant for dispersing the metal powder of the electrode, a black pigment for controlling the contrast, and a glass for enhancing the adhesion strength to the glass during calcination. The powder, if necessary, is preferably from 0.01 to 10% by weight, more preferably from 0.1 to 3% by weight, based on the paste composition for printing of the present invention.

Moreover, the present invention provides a method of forming a plasma panel display electrode comprising forming a pattern by using the above-described paste composition for printing by gravure offset printing, which is characterized by using the paste for offset printing of the present invention. The material replaces the conventional paste composition that has been used to form the electrodes of the plasma display panel, and uses gravure offset printing, and any other known method can be applied to form the plasma display electrodes.

Moreover, the present invention provides a method of forming an electrode for shielding a screen filter for electromagnetic waves, comprising forming a pattern by using the above-described paste composition for printing by gravure offset printing, characterized in that the adhesive plate of the present invention is used. The paste composition for printing replaces the screen filter electrode which has been used to form a shielded electromagnetic wave, and uses a gravure offset method, and any other known method can be applied to form a screen filter electrode for shielding electromagnetic waves.

The electrode forming method of the plasma display panel using the paste composition for printing of the present invention and the method for preparing the screen filter for shielding electromagnetic waves can provide excellent printing performance, and the formed pattern has excellent directivity and Stability, and in particular, when compared to the photolithography technique, the cost saving effect is significantly improved by the direct printing mode.

In order to better understand the present invention, the following is a preferred embodiment. The following examples are merely illustrative of the invention and are not intended to limit the scope of the invention.

Example Example 1

15 wt% polymer resin (weight average molecular weight 25,000), wherein methacrylic acid (MA): benzyl acrylate (BA): 2-hydroxyethyl (meth) acrylate (2-HEMA): methyl (A) Acrylate (MMA) is polymerized in a weight ratio of 30:20:10:40, which is an acrylic polymer resin, 15 wt% of terpineol as a high boiling point solvent (α-, β-, γ- a mixture of terpineol), 10 wt% of propylene glycol monomethyl propionate (PGMEP) as a low boiling point solvent, 63 wt% of silver as a metal powder for an electrode, and 2 wt% as a dispersing agent An organic dispersant containing an amine group is mixed and stirred at room temperature, and finally a three-way stirrer is used to prepare a desired paste composition for printing.

Examples 2 to 3 and Comparative Examples 1-2

Except that the composition shown in the following Table 1 was used in Example 1, the procedure similar to that of Example 1 was carried out to prepare a paste composition for printing.

The units used in Table 1 are wt%.

The paste compositions for printing prepared in Examples 1 to 3 and Comparative Example 1 or 2 were evaluated for printing efficiency, minimum line width, and pattern directionality on gravure offset printing, and the results are shown in Fig. 1. Same as in Table 2 below.

The printing performance was evaluated by observing the composition level remaining on the tape in the SET mode without being transferred to the substrate by an optical microscope, wherein ○ indicates that no printing composition remains on the tape, and X indicates that the SET is in the SET. In the mode, there is a case where an excessive amount of the printing composition remains on the tape and it is impossible to transfer the pattern to the substrate. The minimum line width is evaluated by measuring the minimum size of the pattern that can be formed by gravure offset printing, and the smaller the size, the better. Regarding the pattern directivity, the degree of directivity in the pattern formed on the substrate after printing was observed with an optical microscope, and the case where the excellent directivity was shown was ○, and the case where Δ was normal and X when it was poor.

As shown in Table 2 and Figure 1 above, Examples 1-3 were formed by the gravure offset printing method using the paste composition for printing of the present invention, which showed superiority compared with Comparative Example 1 or 2. Print performance, narrow minimum line width of 20 μm and below, and excellent pattern directionality. Further, Comparative Example 2 could not be printed, resulting in no pattern.

The paste composition for printing of the present invention is suitable for a gravure offset printing mode in which a fine pattern is directly formed, and has an excellent cost saving effect compared with a conventional method based on photolithography technology, and at the same time, can be satisfied as The various properties required for the composition, and each of which is desirable for the printing process and thus exhibits suitable offset performance.

While the invention has been described in detail, the preferred embodiments of the present invention Changes and modifications are intended to fall within the scope of the appended claims.

Fig. 1 is a photograph showing the minimum line width after gravure offset printing, which was prepared using a paste composition for printing according to an embodiment of the present invention and a comparative example.

Claims (6)

A paste composition for printing comprising: a) 5 to 30 wt% of an acrylic polymer resin; b) 5 to 35 wt% of a high boiling solvent having a boiling point of at least 200 ° C; c) 5 to 35 wt % of a low boiling point solvent having a boiling point of less than 200 ° C; and d) 50 to 85% by weight of a metal powder; wherein the acrylic polymer resin of a) is polymerized by the presence of a solvent i) 20 to 50 wt % of one unsaturated carboxylic acid monomer, ii) 10-30% by weight of one aromatic monomer, and iii) 20-60% by weight of one monomer selected from the group consisting of : 2-hydroxyethyl (meth) acrylate, 2-hydroxyoctyl (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl acrylate, and mixtures thereof; The unsaturated carboxylic acid monosystem is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, vinyl acetate, and an anhydride thereof. And a mixture thereof; wherein the aromatic mono system is selected from the group consisting of styrene, benzyl methacrylate, benzyl acrylate, phenyl acrylate, A Phenyl acrylate, phenyl 2-nitroacrylate, phenyl 4-nitroacrylate, phenyl 2-nitromethyl methacrylate, phenyl 4-nitromethyl methacrylate, benzyl 2-nitromethyl methacrylate, Benzyl 4-nitromethyl methacrylate, phenyl 2-chloroacrylate, phenyl 4-chloroacrylate, phenyl 2-chloromethyl methacrylate, phenyl 4-chloromethyl acrylate, and mixtures thereof; The high boiling point solvent of b) is selected from the group consisting of γ-butyrolactone, butylcarbitol acetate, carbitol, methoxymethyl. Ethyl propyl propionate, terpineol and mixtures thereof; and wherein the low boiling point solvent of c) is selected from the group consisting of propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, propylene glycol Monomethyl propionate, diethyl ether propionate, propylene glycol monomethyl ether acetate, stilbene ethyl ketone, ethyl lactate, and mixtures thereof. A paste composition for printing according to the first aspect of the invention, wherein the acrylic polymer resin has an average weight molecular weight of from 10,000 to 100,000 on average. The paste composition for printing according to item 1 of the patent application, wherein the silver powder of d) is selected from the group consisting of silver, copper, nickel, an alloy containing the same, and Its mixture. The paste composition for printing of claim 1, further comprising at least one additive selected from the group consisting of a dispersant, a black pigment, and a glass powder. A method of forming a plasma panel display electrode, comprising forming a pattern by using a paste composition for printing according to any one of claims 1 to 4 by gravure offset printing. A method of forming an electrode for shielding a screen filter of an electromagnetic wave, comprising forming a pattern by using a paste composition for printing according to any one of claims 1 to 4 by gravure offset printing.