Title of Invention

SILVER ORGANO-SOL INK FOR FORMING ELECTRICALLY CONDUCTIVE PATTERNS

Abstract

The present invention relates to solution type silver organo-sol ink for forming electrically conductive patterns. The present invention provides silver organo-sol ink of solution type for forming electrically conductive pattern comprising effective amount of silver aromatic carboxylate and a reactive organic solvents, which can form chelate or complex with silver, are, for example, organic solvents having keton, mercapto, carboxyl, aniline or sulfurous functional group, substituted or unsubstituted. By the present invention, silver organo-sol ink of solution type basically having higher content of silver is obtained. The solution type ink of the present invention can be used for forming conductive patterns in flat panel display such as plasma display panel(PDP) to reduce the numbers of steps for pattern forming drastically.

Full Text

1 WO 2007/029902 PCT/KR2005/004099 Description SILVER ORGANO-SOL INK FOR FORMING ELECTRICALLY CONDUCTIVE PATTERNS Technical Field [1] The present invention relates to silver organo-sol ink, more specifically solution type silver organo-sol ink for forming electrically conductive patterns. Background Art [2] Pattern forming technologies used in semiconductor and display industries are classified into 3 categories. One is a subtractive method mainly applied to thin film technologies such as CVD, PVD and sputtering wherein a metal layer is deposited on a substrate, a photo-resist layer is patterned by lithography on the metal layer, and then the metal layer is etched as a pattern. Another is an additive method used in thick film technologies such as screen-printing. The other is a subtractive-additive method adopting both of a subtractive method and an additive method. Pattern forming by an additive methodis an economic process, which spares material and decreases number of steps, but additive methods of thick filmtechnologies such as screen-printing are not so fine as thin filmtechnologies, and thus are applied to different processes. [3] If an additive method accomplishes finer patterns, it is more favorable in aspects of environment and cost reduction. For example, attempts to apply an additive method to pattern forming for color filters originally formed by thin filmtechnologies have been made. In this context, pattern forming by inkjet printing has been recently noted. [4] MOD material has been researched since Vest, R.W. tested inks made of MOD material (IEEE Transactions on Components, Hybrids and Manufacturing Technology, 12(4), 545-549, 1987). Kydd, et al in WO98-37133 disclosed inkjet-printing ink consisting of MOD material and particulate metal. US Patent No. 6878184 owned by Kovio Inc. disclosed metal ink of nano-size particle prepared from MOD and a reductant (for example, aldehydes). Many attempts have been made to use ink containing dispersed fine metal particles, especially silver particles for forming electrically conductive pattern. A new inkjet- printing system including nozzles should be devised with inks dispersed with fine metal particles, i.e., fine silver particles because those behave differently from ordinary inks. In addition, additives added to sustain suspension would do harm to the physical properties of patterns formed. [5] In the above-mentioned respect, inks containing MOD (metallo-organic de- composition material)can be applied to traditional inkjet printing devices without severe modification of the system if those are thoroughly solution. Solution inks containing MOD, in addition, can lower the temperature of metalizacion, and thus can 2 WO 2007/029902 PCT/KR2005/004099 be applied on flexible substrates such as plastic. [6] Korean Patent Publication No. 2004-85470 applied by Haeuncomtec disclosed a metal ink for inkjet-printing consisting of 5~40t% of silver oxide, 10-20 wt% of lactam, lactone or carbonate and 20-85 wt% of amine. The ink prepared in the example is likely suspension rather than solution considering the dark color of the ink. Emulsifier which may do harm to the physical properties of patterns formed, should be added to the ink to sustain suspension, In addition, maintenance problems concerning nozzle clog caused by particles may arise. [7] Prior arts published to date are listed below as Table 1 and Table 2. [8] [9] Table 1 Patent Documents No. Countr y Applicant(In ventor) Title of Invention Application Date(Publication or Regis- trationNo.) Technical Features 1) us Engelhard(P ascaline Nguyen) metallized substrates and process for producing 1986,9,10(Pat.No. 4808274) Metal carboxylate, alcoholate, mercaptide, amino+carboxylate , acyl+carboxylate, alkoxide 2) us (Michael G. Firmstone, etal) Seed layer com- positions containing organogold and organosilver compounds 1990,4,27(Pat.No. 5059242) metal bonded to hydrocarbon through thio, polythio, carboxylate bridge 3) us Degussa (Lotze; Marion) Gold(I) mercapto carboxylic acid esters, method of their preparation and use - 1993,4,5(Pat.No.5 312480) gold(I)mercaptocar boxyic acid ester used for ceramic gold decoration 4) PCT Parelec, Inc. (Kydd; Paul H. DD) Material and method for printing high con International Ap- plication 1997, 9, - 12(international metal powder+MOD or ROM (reactive 3 WO 2007/029902 PCT/KR2005/004099 ductivity electrical conductors and other components on thin film transistor arrays publication WO98-37133) organic medium); MOD is defined as organic material bonded to metal through hetero atoms such as O, N, S, P, As and Se 5) US Kovio, Inc (Rockenber ger; Joerg) Nanoparticle synthesis and the formation of inks therefrom 2002,8,9(Pat.No. 6878184) particulate ink prepared by reducing MOD(or metal powder +RMO) with aldehydes 6) South Korea haeuncomte c(Kwangchu n-Jung) Organic silver composition, preparing method therefor, inks prepared therefrom and method for forming conductive circuit with use thereof 2003,03,28(Public ation No. 2004-84570) 5-40 wt% of Ag+10-20 wt% of (lactam, lacton or carbonate+20-85 wt% of amine [10] [11] Table 2 Nonpatent Documents No author Title of Article Publication date Technical features 1) Teng, K.F., and Vest, R.W. Liquid Ink Jet Printing with MOD Inks for Hybrid Mi- crocircuits IEEE Transactions on Components,Hybr ids and Mamu- facturing Technology, 12(4), 545-549, 1987 MOD is mentioned as organic material bonded to metal through hetero atoms such as O, N, S and PSpecifically, silver neodecanoate and Au amine 2-ethylhexoate is ex- amplified. Dielectric ink and resistance ink are mentioned WO 2007/029902 PCT/KR2005/004099 2) Lea Yancey Direct Write Metal- lizations with Organometallic Inks 2000,8,18undergra duate thesis of Berkely University (hfa)Ag(COD), (hfa)Cu(BTMS) and(hfa)Cu(VTMS) are spayed or printed by inkjet printing on heated glass annealed and resistance are tested 3) C. Curtis, Metallizations by Direct-Write InkJet Printing To be presented at the NCPV Program Review MeetingLakewood , Coloradol4-17 October 2001 (hfa)Ag(COD) 4) 5) Alex Martins on Kevin Cheng,* Synthesis of Single Phase SrCu2O2 from Liquid Precursors Ink-Jet Printing, Self-Assembled Polyelectrolytes, an- dElectroless Plating: Peer-Reviewed science Journal2004, 3, 3 Macromol. Rapid Commun. 2005, 26, 247-264 SrCu2O2 from MOD(copper formate and strontium acetate) is printed and annealed at 770°Cused as photosemi- conductor of solar cell laminating polymer electrolytes PAA and PAH by PEM technology and patterning the laminar with catalyst Na2PdC14 and deposit in copper bath electolessly. lower met- alization is possible [12] Disclosure of Invention Technical Problem [13] The object of the present invention is to provide silver organo-sol ink for forming electrically conductive patterns with good physical properties. [14] The other object of the present invention is to provide silver organo-sol ink, which can be applied to traditional printing methods including inkjet-printing. Technical Solution [15] The present invention provides silver organo-sol ink of solution type for forming electrically conductive pattern comprising effective amount of silver aromatic 5 WO 2007/029902 PCT/KR2005/004099 carboxylate defined as Formulas 1; and solvent dissolving said silver aromatic carboxylate [16] [17] [18] in which R R R R and R are respectively COO Ag+, H, OH or Cl to C9 alkyl. 1, 2, 3, 4 5 Herein, "organo-sol" means that silver exist as solution state bound to organic material. [19] The said dissolving solvent desirably consists of a reactive organic solvent, which can form chelate or complex with silver, and polar or nonpolar diluent solvent for control of viscosity. The reactive organic solvents, which can form chelate or complex with silver, are, for example, organic solvents having keton, mercapto, carboxyl, aniline or sulfurous functional group, substituted or unsubstituted. The silver aromatic carboxylate is typically 5-70 wt% of the total ink composition. [20] As a preferred embodiment, the present invention provides silver organo-sol ink of solution type comprising 10 to 50 wt% of silver aromatic carboxylate defined as Formulas la; 10 to 60 wt% of reactive organic solvent selected from the group consisting of amine substituted by one or more Cl to C6 hydroxy alkyl and C2 to C16 aliphatic thiol, linear or branched; and residual polar or nonpolar diluent solvent [21] [22] [23] in which R R R R and R are respectively H, OH or Cl to C9 alkyl. Said silver aromatic carboxylate defined as Formulas la is most desirably silver benzoate when R R R R and R are respectively H. 1, 2,, 3, 4 5 o WO 2007/029902 PCT/KR2005/004099 [24] As another preferred embodiment, the present invention provides silver organo-sol ink of solution type comprising 10 to 50 wt% of silver aromatic carboxylate defined as Formulas lb; 10 to 60 wt% of reactive organic solvent selected from the group consisting of amine substituted by one or more Cl to C6 hydroxy alkyl and C2 to C16 aliphatic thiol, linear or branched; and residual polar or nonpolar diluent solvent [25] [26] [27] in which one among R R R R and R is COO Ag+' the others are respectively H, OH or Cl to C9 alkyl, but desirably R is COO~Ag+. Said silver aromatic carboxylate defined as Formulas lb is most desirably silver phthalate when R is COO~Ag+ and the others R R R and R are respectively H. 1, 2,, 4 5 r J [28] As another preferred embodiment, the present invention provides silver organo-sol ink of solution type comprising 10 to 50 wt% of silver aromatic carboxylate defined as Formulas lc; 10 to 60 wt% of reactive organic solvent selected from the group consisting of amine substituted by one or more Cl to C6 hydroxy alkyl and C2 to C16 aliphatic thiol, linear or branched; and residual polar or nonpolar diluent solvent [29] [30] [31] in which two or more among R R R R andR are COO"Ag+, the others are re- spectively H, OH or Cl to C9 alkyl, but desirably R and R are COOAg+. Said silver aromatic carboxylate defined as Formulas lc is most desirably silver trimesate when R and R are COO"Ag+ and the others R R and R are respectively H. 4 1, 3 5 7 WO 2007/029902 PCT/KR2005/004099 [32] The organosol ink of the present invention may further comprise surfactants and/or viscosity controlling agents. In addition, it may comprise further nonconductive polymeric or glassy material as matrix or flux material for silver conductor. The organo-sol ink of the present invention can be applied not only to processes for display manufacturing such as PDP and Rfid but also to other processes such as solar cells wherein conductive patterns are required. [33] Silver aromatic carboxylate defined as Formulas 1 has higher contents of silver, especially, silver benzoate has about 47 wt% of silver per mole of the compound. It has a merit of higher content of metalized silver even if small quantity is adopted. [34] Silver aromatic carboxylate defined as Formulas 1 in the organo-sol ink of the present invention desirably ranges from 5 wt % to 70 wt% of the total ink composition since silver content becomes small below 5 w% and making solution with it becomes difficult above 70 wt%. The preferred range is 10 wt % to 50 wt%. The most preferred range is 20 wt % to 40 wt%. Silver aromatic carboxylate defined as Formulas 1 is prepared by reacting silver inorganic acid salt such as silver nitrate with alkali metal salt corresponding to Formulas 1 with silver replaced by alkali metal. [35] The said reactive organic solvent is broadly organic solvent which can form chelate or complex with silver through hetero atom N, O and S ,more preferably, hydrocarbons having keton, mercapto, carboxyl, aniline or sulfurous functional group, substituted or unsubstituted. The most preferred are monoethanolamine, diethanolamine and tri- ethanolamine. The organo-sol ink of the present invention has light color but is basically clear. The viscosity of the initial solution which is prepared by dissolving the silver organic salt in a reactive organic solvent such as ethanolamine ranges about 10,000 to 100,000cp, and thus it can be used in screen-printing, offset-printing and imprinting. It also can be diluted by diluent such as ethanol or water according to the object of use. [36] Silver organo-sol prepared by dissolving silver aromatic carboxylate in reactive solvent, for example, amine substituted by one or more ethanol may be further diluted with ethylene glycol or water to be deposited on a hydrophilic substrate. On the other hand, it may be diluted with an alcohol of short chain alcohol such as ethanol to be deposited on a substrate having a hydrophobic metal oxide film thereon. It is presumed that the solubility increases drastically because the reactive organic solvent forms complex with the silver aromatic carboxylate by chelating or coordinate covalent bonding. [37] A preferred nonpolar diluent solvent is an aliphatic or aromatic hydrocarbon or mixture thereof. A preferred polar diluent solvent is water or Cl to C12, saturated or unsaturated, mono to tri functional aliphatic alcohol. The organic solvent, for example, is 2-methoxy ethanol, 1,2-hexanediol, benzene, toluene, xylene, dimethylcarbithol, 8 WO 2007/02,9902 PCT/KR2005/004099 kerosene ethanol, methanol, 2-propanol, chloroform or ethylene glycol. [38] The solution type ink of the present invention can be used for forming conductive patterns in flat panel display such as plasma display panel(PDP) to reduce the numbers of steps for pattern forming drastically. Especially, since metalized silver from the silver organo-sol ink of the present invention is stable at relatively higher temperature, for example, 450~600°C, more specifically, at 480~580°C, the silver ink is approproate for conductive pattern forming in PDP manufacturing wherein sealing and sintering of barrier ribs is carried out around the temperature range. Advantageous Effects [39] By the present invention, silver organo-sol ink of solution type basically having higher content of silver is obtained. The solution type ink of the present invention can be used for forming conductive patterns in flat panel display such as plasma display panel(PDP) to reduce the numbers of steps for pattern forming drastically. Brief Description of the Drawings [40] Figure 1 shows IR spectrometer graphs of silver powder, triethanolamine and silver organo-sol ink used by Example 1. [41] Figure 2 is a photograph showing contact angle against glass of silver organo-sol ink prepared by Example 1. [42] Figure 3 shows from above respectively (a) SEM images of two scales regarding a sample after heat-treatment at 550°C for 10 minutes prepared by Example 3, (b) SEM images of two scales regarding a sample prepared by Example 4 after heat-treatment at 550°C for 10 minutes and (c) SEM images of two scales regarding a sample prepared by Example 5 after heat-treatment at 550°C for 10 minutes. Best Mode for Carrying Out the Invention [43] The present invention is illustrated by examples below. However, such examples presented for the purpose of illustration does not serve as a basis to decide the scope of the invention. [44] [45] Example 1 [46] 50mmol benzoic acid is dissolved in 50mL of methanol. 50mmol NaOH dissolved in 50mL water is added slowly to the benzoic acid solution prepared while stirring to obtain sodium benzoate. 50mmol silver nitrate dissolved in 50mL water is added to the sodium benzoate solution, and then white precipitate forms fast. The precipitate is washed to remove unreacted silver nitrate and NaOH with water, filtered and washed several times to remove unreacted benzoic acid with methanol. The filtrant white silver benzoate is sensitive to light and should be dried and stored in dark room or under yellow light. 9 WO 2007/029902 PCT/KR2005/004099 [47] 0.07mol prepared powder of silver benzoic acid (molecular weight: about 228g/mol) is dissolved in 0.14mol triethanolamine and 40mL ethylene is added to control viscosity. The viscosity of the solution prepared is 15cPs at 25°C by Brookfield viscometer. Absorption bands around 1000 and 1300 cm"1 characteristic peak of silver solution are also observed by IR spectrometer. [48] The contact angle of the solution against glass substrate is observed to be about 40°C. The glass is coated by the ink solution prepared with a bar cpater, heat-treated at 150cC for 10 minutes and resistance is measured to be 5.5x10" ODD. The coated glass is further heat treated at 500°C. The resistance is 2.505x10~6Q[H. The solid content of the solution ink is about 63 wt% of the total solution since the weights of the solution coated and residual solid after heat-treatment at 500°C are respectively 0.5804g and 0.3656g. [49] [50] Example 2 [51] 50mmol benzoic acid is dissolved in 50mL of methanol. 50mmol NaOH dissolved in 50mL water is added slowly to the benzoic acid solution prepared while stirring to obtain sodium benzoate. 50mmol silver nitrate dissolved in 50mL water is added to the sodium benzoate solution, and then white precipitate forms fast. The precipitate is silver benzoate formed by exchange of Na+ and Ag+ by ionization tendency, washed to remove unreacted silver nitrate and NaOH with water, filtered and further washed several times to remove unreacted benzoic acid with methanol, and dried at 50°C to obtain final silver benzoate. [52] 0.07mol prepared powder of silver benzoic acid (molecular weight: about 228g/mol) is dissolved in 0.14mol OT (octanethiol). Xylene is added so that the viscosity of the solution prepared should be between 13~15cps at 25°C by Brookfield viscometer, and the solution is agitated for 30 minute more. [53] Glass substrate is coated by the ink solution prepared with a bar coater, heat-treated 150°C for 10 minutes and resistance is measured. The coated glass is further heat- treated at 500°C. The resistance is measured. By the residual solid content of the solution ink after heat-treatment at 500°C the final silver content is decided. Volumetric resistance with thickness of coated film is measured. The resistance is 2.75x10"6QDD. The solid content of the solution ink is about 54.3 wt% of the total solution. Amounts of reagents and measured value are listed in Table 3. [54] [55] Example 3 [56] 50mmol benzoic acid is dissolved in 50mL methanol. 50mrno! NaOH dissolved in 50mL water is added slowly to the benzoic acid solution prepared while stirring to obtain sodium benzoate. 50mmol silver nitrate dissolved in 50mL water is added to the 10 WO 2007/029902 PCT/KR2005/004099 sodium benzoate solution, and then white precipitate forms fast. The precipitate is silver benzoate formed by exchange of Na+ and Ag+ by ionization tendency, washed to remove unreacted silver nitrate and NaOH with water, filtered and further washed several times to remove unreacted benzoic acid with methanol, and dried at 50°C to obtain final silver benzoate. [57] 0.21mol prepared powder of silver benzoic acid (molecular weight: about 228g/mol) is dissolved in 0.42mol TEA (triethanol amine). Ehtanol is added so that the viscosity of the solution prepared should be 15cps at 25°C by Brookfield viscometer, and the solution is agitated for 30 minute more. [58] Glass substrate is coated by the ink solution prepared with a bar coater, heat-treated 150°C for 10 minutes and resistance is measured. The coated glass is further heat treated at 550°C. The resistance is measured. The microstructure is shown in Figure 3 According Figure 3, silver particles are fused together after heat-treatment at 550°C even on 10,000 times enlarged images. By the residual solid content of the solution ink after heat-treatment at 550°C the final silver content is decided. Volumetric resistance with thickness of coated film is measured. Amounts of reagents and measured value are listed in Table 3. [59] [60] Example 4 [61] Example 4 is carried out the same way as Example 2 except that terephthalic acid is used instead of benzoic acid. The microstructure is shown in Figure 3. According Figure 3, silver particles are fused together after heat-treatment at 550°C even on 10,000 times enlarged images. Volumetric resistance with thickness of coated film is measured. Amounts of reagents and measured value are listed in Table 3. [62] [63] Example 5 [64] Example 5 is carried out the same way as Example 2 except that trimesic acid is used instead of benzoic acid. The microstructure is shown in Figure 3. According Figure 3, silver particles are fused together after heat-treatment at 550°C even on 10,000 times enlarged images. Volumetric resistance with thickness of coated film is measured. Amounts of reagents and measured value are listed in Table 3. [65] [66] Table 3 Precursor Reactive solvent Solvent resistance(10 Example Amount( mol) name Amount(m ol) Name Amount(ml) or (g) Q-D) l.Agl 0.07 TEA 0.14 xylene 40(ml) 2.505 11 WO 2007/029902 PCT/KR2005/004099 2.Agl 0.07 OT 0.14 EtOH 40(ml) 2.75 3.Agl 0.21 EA 0.42 EtOH 58(g) 9.9 4.Ag2 0.21 EA 0.84 EtOH 186(g) 2.7 5.Ag3 0.21 EA 1.26 EtOH 150(g) 1.1 [67] * Ag 1; One COOAg Ag 2; Two COOAg Ag 3; Three COOAg [68] Industrial Applicability [69] The solution type ink of the present invention can be used for forming conductive patterns by traditional printing technology, especially by inkjet-printing, in flat panel display such as plasma display panel(PDP) to reduce the numbers of steps for pattern forming drastically. 12 WO 2007/029902 PCT/KR2005/004099 Claims [1] Silver organo-sol ink of solution type for forming electrically conductive pattern comprising effective amount of silver aromatic carboxylate defined as Formulas 1; and solvent dissolving said silver aromatic carboxylate in which R R R R and R are respectively COO"Ag+, H, OH or Cl to C9 alkyl. [2] Silver organo-sol ink of solution type according to claim 1, wherein said solvent consists of a reactive organic solvent which can form chelate or complex with silver and polar or nonpolar diluent solvent for control of viscosity. [3] Silver organo-sol ink of solution type according to claim 2, wherein said reactive organic solvent is a hydrocarbon having keton, mercapto, carboxyl, aniline or sulfurous functional group. [4] Silver organo-sol ink of solution type according to claim 3, wherein said nonpolar diluent solvent is an aliphatic or aromatic hydrocarbon and said polar diluent solvent is water or Cl to C12, saturated or unsaturated, mono to tri functional aliphatic alcohol. [5] Silver organo-sol ink of solution type according to claim 4, wherein said silver aromatic carboxylate is 5 to 70 wt% of the total silver organo-sol ink. [6] Silver organo-sol ink of solution type according to claim 5, wherein said silver aromatic carboxylate defined as Formulas la is 10 to 50 wt% of the total silver organo-sol ink, said reactive organic solvent selected from the group consisting of amine substituted by one or more Cl to C6 hydroxy alkyl and C2 to Cl 6 aliphatic thiol, is 10 to 60 wt% of the total silver organo-sol ink 13 WO 2007/029902 PCT/KR2005/004099 in which R R R R and R are respectively H, OH or Cl to C9 alkyl. 1, 2, 3, 4 5 r J ' J [7] Silver organo-sol ink of solution type according to claim 6, wherein said silver aromatic carboxylate defined as Formulas 1 a is silver benzoate. [8] Silver organo-sol ink of solution type according to claim 5, wherein said silver aromatic carboxylate defined as Formulas lb is 10 to 50 wt% of the total silver organo-sol ink, said reactive organic solvent selected from the group consisting of amine substituted by one or more Cl to C6 hydroxy alkyl and C2 to C16 aliphatic thiol, is 10 to 60 wt% of the total silver organo-sol ink in which one among R R R R and R is COO~Ag+ and the others are re- ° 1, 2, 3, 4 5 spectively H, OH or Cl to C9 alkyl. [9] Silver organo-sol ink of solution type according to claim 8, wherein R is COO~ Ag+andR R R andR are respectively H, OH or Cl to C9 alkyl. [10] Silver organo-sol ink of solution type according to claim 9, wherein said silver aromatic carboxylate defined as Formulas lb is silver phthalate. [11] Silver organo-sol ink of solution type according to claim 5, wherein said silver aromatic carboxylate defined as Formulas lb is 10 to 50 wt% of the total silver organo-sol ink, said reactive organic solvent selected from the group consisting of amine substituted by one or more Cl to C6 hydroxy alkyl and C2 to Cl 6 aliphatic thiol, is 10 to 60 wt% of the total silver organo-sol ink 14 WO 2007/029902 PCT/KR2005/004099 in which two or more among R R R R and R are COO~Ag+, the others are re- b 1, 2, 3, 4 5 b spectively H, OH or Cl to C9 alkyl. [12] Silver organo-sol ink of solution type according to claim 11, wherein R and R are COO Ag+ and R R and R are respectively H, OH or Cl to C9 alkyl. [13] Silver organo-sol ink of solution type according to claim 12, wherein said silver aromatic carboxylate defined as Formulas lc is silver trimesate. [14] Silver organo-sol ink of solution type according to any one of claiml to claim 13, wherein said silver organo-sol ink is used for electrically conductive patterns by inkjet-printing. [15] Silver organo-sol ink of solution type according to claim 14, wherein said silver aromatic carboxylate is 20 to 40 wt% of the total silver organo-sol ink. [16] Silver organo-sol ink of solution type according to claim 15, wherein said reactive solvent is ethanolamine, diethanolamine or triethanolamine. [17] Silver organo-sol ink of solution type according to claim 16, wherein said nonpolar diluent solvent is an aliphatic or aromatic hydrocarbon or mixture thereof said polar diluent solvent is water or Cl to C12 saturated or unsaturated mono to tri functional aliphatic alcohol. [18] Silver organo-sol ink of solution type according to claim 17, wherein said nonpolar diluent solvent is benzene, toluene, xylene. The present invention relates to solution type silver organo-sol ink for forming electrically conductive patterns. The present invention provides silver organo-sol ink of solution type for forming electrically conductive pattern comprising effective amount of silver aromatic carboxylate and a reactive organic solvents, which can form chelate or complex with silver, are, for example, organic solvents having keton, mercapto, carboxyl, aniline or sulfurous functional group, substituted or unsubstituted. By the present invention, silver organo-sol ink of solution type basically having higher content of silver is obtained. The solution type ink of the present invention can be used for forming conductive patterns in flat panel display such as plasma display panel(PDP) to reduce the numbers of steps for pattern forming drastically.

Documents:

00841-kolnp-2008-abstract.pdf

00841-kolnp-2008-claims.pdf

00841-kolnp-2008-correspondence others.pdf

00841-kolnp-2008-description complete.pdf

00841-kolnp-2008-drawings.pdf

00841-kolnp-2008-form 1.pdf

00841-kolnp-2008-form 3.pdf

00841-kolnp-2008-form 5.pdf

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00841-kolnp-2008-international search report.pdf

841-KOLNP-2008-(15-05-2013)-CORRESPONDENCE.pdf

841-KOLNP-2008-(15-05-2013)-ENGLISH TRANSLATION.pdf

841-KOLNP-2008-(15-05-2013)-PETITION UNDER RULE 137.pdf

841-KOLNP-2008-(17-01-2013)-CORRESPONDENCE.pdf

841-KOLNP-2008-(17-01-2013)-OTHERS.pdf

841-KOLNP-2008-(30-04-2013)-ABSTRACT.pdf

841-KOLNP-2008-(30-04-2013)-AMANDED PAGED.pdf

841-KOLNP-2008-(30-04-2013)-CLAIMS.pdf

841-KOLNP-2008-(30-04-2013)-CORRESPONDENCE.pdf

841-KOLNP-2008-(30-04-2013)-DRAWINGS.pdf

841-KOLNP-2008-(30-04-2013)-FORM 2.pdf

841-KOLNP-2008-(30-04-2013)-FORM 3.pdf

841-KOLNP-2008-(30-04-2013)-OTHERS.pdf

841-KOLNP-2008-(30-04-2013)-PA.pdf

841-KOLNP-2008-(30-04-2013)-PETITION UNDER RULE 137.pdf

841-KOLNP-2008-ASSIGNMENT.pdf

841-KOLNP-2008-CORRESPONDENCE OTHERS 1.1.pdf

841-KOLNP-2008-CORRESPONDENCE.pdf

841-KOLNP-2008-FORM 13.pdf

841-kolnp-2008-form 18.pdf

841-KOLNP-2008-FORM 3.1.pdf

841-KOLNP-2008-GPA.pdf

841-KOLNP-2008-INTERNATIONAL SEARCH AUTHORITY REPORT 1.1.pdf

841-KOLNP-2008-PCT PRIORITY.pdf

841-KOLNP-2008-PCT REQUEST FORM.pdf

841-KOLNP-2008-REPLY TO EXAMINATION REPORT.pdf

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