WO2005015573A1 - 導電性ペースト - Google Patents
導電性ペースト Download PDFInfo
- Publication number
- WO2005015573A1 WO2005015573A1 PCT/JP2004/010286 JP2004010286W WO2005015573A1 WO 2005015573 A1 WO2005015573 A1 WO 2005015573A1 JP 2004010286 W JP2004010286 W JP 2004010286W WO 2005015573 A1 WO2005015573 A1 WO 2005015573A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glass frit
- weight
- conductive paste
- less
- metal powder
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
- H05K1/092—Dispersed materials, e.g. conductive pastes or inks
Definitions
- the present invention relates to a conductive paste that is often used for printing on an insulating substrate and heat-sintering to form an electric circuit on the substrate.
- Conductive pastes used in electronic device parts are widely used because electrode patterns can be formed by printing.
- a method of further lowering the resistance by heating and sintering a pattern formed by application is adopted.
- the metal powder used for the conductive paste decreases the contact resistance between the metal powders as the sintering progresses, and shows better conductivity as a coating pattern.
- a method of adding an inorganic material such as glass as a binder has been adopted, and such materials have been provided.
- patent literature 1 as a main component silver powder, is disclosed S io 2 powder and the glass frit (P bo- S I_ ⁇ 2 system) and silver-based conductor paste comprising an organic vehicle (conductive paste) I have.
- Sio 2 powder a film is formed at the time of sintering, and the plating resistance is improved.
- Garasufuri Tsu is set configuration of bets (S i 0 2 - AI 2 0 3 - B 2 0 3 - Mg O- C a O) a, its softening point is 5 80 ⁇ 800 ° C.
- Patent Document 3 there is also a document that separately describes each component used in the conductive paste.
- Noble metal powder is used as the metal powder, and the shape is preferably spherical, and the particle size is described as 0.1 to 3.0 ⁇ .
- Glass powder described conventionally known S I_ ⁇ 2, A 1 2 0 3, PbO, and C a O, glass powder having a softening point of B 2 ⁇ 3 or the like 450 to 650 ° C which is the main component I have.
- An organic vehicle is a dispersant used to mix a metal powder and a binder and make the material suitable for application. And a resin component and an additive component.
- fatty acid amide wax is an essential component.
- Patent Document 1 Japanese Patent Application Laid-Open No. H10-10663466
- Patent Document 2 Patent No. 29410
- Patent Document 3 Japanese Patent Application Laid-Open No. 2003-133203 Disclosure of the Invention
- the conductive paste used by heating and sintering is usually formed from precious metal powder, glass frit, or an organic vehicle, and various combinations thereof are used.
- conventional conductive pastes require sintering at a higher temperature (for example, at a temperature of 500 ° C or higher) in order to increase conductivity.
- high conductivity cannot be obtained if the value is lowered.
- the sintering temperature must be lowered, and a conductive paste that can achieve both low-temperature sinterability and high conductivity has been required. In order to lower the wiring resistance, it is necessary to apply a thick film.
- the film thickness is large, the residual stress of the coating film becomes large, and when a glass substrate is used as a base, or when a base material such as glass is used.
- a material coated with a dielectric layer was used as an underlayer, interference fringes and cracks occurred in the underlying dielectric layer and glass substrate, making it difficult to increase the film thickness.
- the present invention solves the above-mentioned problem, and is a conductive paste that can obtain high conductivity even when the sintering temperature is lowered. Furthermore, the workability of the paste was improved, for example, a thick film could be formed.
- the conductive paste of the present invention is a conductive paste containing a metal powder, a glass frit and an organic vehicle as main components, wherein the metal powder has an average primary particle diameter of 0.1 to: spherical particles having a particle size of L ⁇ m. and the (a) 5 0 ⁇ 9 9 wt 0/0, becomes the average diameter of the primary particles is 5 0 eta m or less spherical particles (B) from 1 to 5 0 wt%, and the Garasufuritsu
- the amount of the metal is 0.1% by weight or more and 15% by weight or less based on the total value of the glass frit and the metal powder.
- the spherical particles (A) are in the range of 90 to 97% by weight and the spherical particles (B) are in the range of 3 to 10% by weight, the effects of the packing density and low-temperature sintering are reduced. It is economical and preferable because the amount of spherical particles (B) that can be obtained sufficiently and the production cost is high can be reduced.
- the metal powder in the present invention may be one selected from simple metals, alloys and composite metals.
- the metal type is preferably selected from platinum, gold, silver, copper, nickel, and palladium. Further, the use of silver is preferred because of its excellent conductivity.
- the glass frit used does not contain lead, and when silver is used as the metal powder, it is preferable that the working point be 500 ° C. or less. Workability is improved because it can be operated at relatively low temperatures without lead. It is more preferable to use a glass frit whose working point is 450 ° C. or less.
- the particle size of the glass frit is larger than that of the metal powder, the dispersibility in the paste becomes worse.
- the average particle size of the glass frit is 2 ⁇ or less, the dispersibility in the paste is improved, and the effect of combining the above metal powders can be further exhibited.
- the organic vehicle those obtained by dissolving a cellulosic resin, an acrylic resin, or the like in a solvent are preferable.
- the solvent is non-corrosive to the base material to which the paste is applied, and the use of a solvent having low volatility provides good printing workability.
- ethyl cellulose having a molecular weight of 1000 to 2000 is dissolved in a solvent such as butyrcarbitol acetate ⁇ -terbineol by 10 to 20% by weight.
- a solvent such as butyrcarbitol acetate ⁇ -terbineol by 10 to 20% by weight.
- the use of such a material is excellent in applicability at the time of printing and is preferred.
- the conductive paste according to the present invention is particularly effective in improving the conductivity by increasing the packing density of the metal particles after sintering, and the workability can be improved by combining a preferable glass frit and an organic vehicle. . Thick film coating ⁇ screen The printability is also improved.
- FIG. 1 is an example of an electron micrograph showing silver powder having an average particle size of 17 particles of 50 nm or less used in the present invention.
- metal powders (A) and (B) used in the present invention.
- Commercially available spherical particles ( ⁇ ) having an average primary particle size of 0.1 to 1 ⁇ may be used. it can.
- silver powder S PQ03 S Mitsubishi Metal Mining Co., Ltd.
- average particle diameter 0.5 ⁇ , specific surface area 1.40 m 2 Zg, tap density 4.2 g / cm 3 can be used.
- Spherical particles (B) with an average primary particle size of 50 nm or less can be prepared by wet reduction of metal compounds. Specifically, to a solution prepared by adding a water-soluble metal compound to water or a mixture of water and a lower alcohol, an aqueous solution in which a reducing agent and a surface treating agent are dissolved is added, and the mixture is stirred at 30 ° C or lower.
- aqueous solution in which a reducing agent and a surface treating agent are dissolved is added, and the mixture is stirred at 30 ° C or lower.
- silver powder as an example of the metal powder, it can be produced as follows.
- Silver nitrate was dissolved in a solution obtained by mixing pure water and ethanol in equal amounts, and the pH was adjusted to 11.3 by adding aqueous ammonia to make the solution transparent.
- L-ascorbic acid as a reducing agent and polyacrylic acid as a dispersing agent were dissolved in a liquid obtained by mixing pure water and ethanol in equal amounts.
- This solution was kept at 25 ° C., and the silver nitrate solution prepared above was gradually dropped, and silver fine particles were precipitated with stirring. Thereafter, the particles were washed and dried to obtain spherical silver particles (B) having an average primary particle diameter of 20 nm. Fine metal powders can be obtained with other metal powders by the same operation.
- the two types of silver powders of the spherical particles (A) and (B) obtained above can be used alone as a conductive paste.
- a conductive paste is prepared using only the spherical particles (A)
- the conductivity can be improved by increasing the sintering temperature.
- the sintering temperature is set low to improve workability, the conductivity will decrease.
- the conductive paste is made only of the spherical particles (B)
- the conductivity becomes sufficiently close to that of bulk silver even if the sintering temperature is set low.
- large amounts of expensive spherical particles (B) are used. That is not economic.
- the present invention was obtained by lowering the sintering temperature in terms of workability, obtaining sufficient conductivity, and economical judgment. That is, two types of metal powders are mixed and used at a constant ratio. 'If the spherical particles (B) is less than 1% by weight, the spherical particles (B) do not spread sufficiently around the spherical particles (A), and the effect of low-temperature sintering is very localized. Do not form sufficient conductive paths. For this reason, the conductivity is close to that produced using only the spherical particles (A).
- the spherical particles (A) When the amount of the spherical particles (B) exceeds 50% by weight, the spherical particles (A) are completely surrounded by the spherical particles (B), and the conductivity is sufficient, but a large amount of the spherical particles (B) is used. Cost increases. Therefore, the spherical particles (A) account for 50 to 99% by weight, and the spherical particles (B) account for 1 to 50% by weight. It is better to use in the range of / 0 .
- the spherical particles (A) are used in the range of 90 to 97% by weight and the spherical particles (B) are used in the range of 3 to 10% by weight, sintering can be performed at a low temperature, the conductivity is sufficient, and the cost is low. Can be suppressed.
- the type of the glass frit can be selected from commercial products. First, it is better to use lead-free glass frit for environmental considerations. As such a lead-free glass frit and having a working point of as low as 500 ° C. or less or 450 ° C. or less, a Bi-based glass frit can be mentioned. Main component is a B i 2 ⁇ 3, those other B 2 O 3 and the like are added in small amounts can be preferably used. Examples of this include “110” and “110B” manufactured by Asahi Glass Co., Ltd., and “; BR10” manufactured by Nippon Frit Co., Ltd.
- the size of the glass frit may be small due to the small size of the metal powder used. If the average size of the glass frit is approximately 3 ⁇ and the maximum particle size is approximately 50 ⁇ m, which is usually used for conductive paste, the segregation is reduced. It may affect conductivity. Therefore, it is preferable to use glass frit having an average particle size of 5 ⁇ or less. In addition, since the particle diameter varies, it is appropriate that the maximum particle diameter is 50 im or less. More preferably, if the average particle size is 2 ⁇ m or less and the maximum particle size is 5 ⁇ m or less, unbiasedness is less likely to occur, and excellent conductivity is obtained due to excellent dispersibility.
- the amount of glass frit can be used from a very small amount. When used in a range of about 0.1 to 15% by weight based on the total value of the metal powder and the glass frit, the conductive paste and This is preferable because the adhesion of the substrate can be ensured.
- the amount of glass frit is 0. 1 wt 0 / no less than 0 when paste and adhesion of the base material is weak, conductivity becomes worse and more than 1 5% by weight. Further, when the blending amount of the glass frit is 1% by weight or more and 15% by weight or less, the adhesion between the paste and the base material is further improved, which is more preferable.
- the amount of glass frit is 1% by weight or more, there is no problem when the conductive paste is used at a thickness of 25 ⁇ m or less, but it is applied to a thick film of 25 / im or more and sintered.
- the residual stress of the coating film increases, and when the glass substrate is used as an underlayer or when the glass substrate is coated with a dielectric layer as an underlayer, interference fringes or There is a problem that cracks occur. Therefore, when the blending amount of the glass frit is 0.1% by weight or more and less than 1% by weight with respect to the total value of the glass frit and the metal powder, the coating film stress can be reduced, and the thick film coating property and the adhesion to the substrate can be reduced. This is preferable because it can balance forces.
- the organic vehicle used in the present invention needs to have a property of maintaining a state in which the metal powder and the glass frit are uniformly mixed, and a property of uniformly suppressing the bleeding and the flow of the printing pattern during application to a substrate such as screen printing. I do.
- the solvent is non-corrosive to the substrate to which the paste is applied, and the use of a solvent with low volatility provides good printing workability.
- ethyl cellulose having a molecular weight of 100000 to 20000 is used as the organic vehicle in butyl carbitol acetate.
- the Ichitoya _ Terubineoru like 1 0-2 0 weight 0/0 Ru can be suitably used as dissolved.
- Ethyl cellulose having a molecular weight of 1,800 was dissolved in butyl carbitol acetate as an organic vehicle to prepare a solution having a resin concentration of 14% by weight.
- silver powder of the type and amount shown in Table 1 as metal powder, and the mixture was evenly mixed using a rotary stirring deaerator.
- the glass frit of the type and amount shown in Table 1 was added to continue mixing, and it was determined by observation that the solution was uniform. Then, the solution was passed through a three-roll mill to produce a conductive paste.
- the obtained conductive pastes in Examples 1 to 6 and Comparative Examples 1 to 3, no abnormalities in appearance in a normal state were observed.
- a sample of the prepared conductive paste was formed on a glass substrate (PD200 substrate manufactured by Asahi Glass Co., Ltd.) with a width of 5 mm and a length of 9 mm. After heating at 200 ° C for 30 minutes to evaporate the solvent, transfer to a sintering furnace at the sintering temperature shown in Table 1 (450 ° C and 500 ° C) and heat for 30 minutes Sintered. After sintering, the film thickness and volume resistance were measured to evaluate the conductivity. The film thickness was measured with a surface roughness measuring device (SURFCOM 13OA, manufactured by Tokyo Seimitsu Co., Ltd.). A low resistivity meter (Loresta GP manufactured by Mitsubishi Chemical Corporation) conforming to JIS K 794 was used for volume resistance measurement.
- SURFCOM 13OA surface roughness measuring device
- the adhesiveness of the conductive paste to the substrate was tested.
- the sample used for the above-mentioned conductivity evaluation was cut in a grid pattern at l mm intervals, an adhesive tape was covered on the upper surface, a tape peeling test was performed 10 times, and the degree of peeling was observed (cross-cut peeling test).
- a tape peeling test was performed 10 times with an adhesive tape placed on the upper surface without making a cut, and the degree of peeling was observed (tape peeling test).
- the evaluation indices are:: No peeling in a cross-cut peel test,
- Example 4 using a glass frit having a working point of 475 ° C, sufficient conductivity was obtained when sintering at 500 ° C, but sufficient conductivity was obtained when sintering at 450 ° C. Does not show conductivity.
- the amount of glass frit was set to the upper limit (15% by weight), the amount of glass in the conductor increases, and the conductivity slightly decreases. However, sintering at 500 ° C reduced the volume resistance to less than 3 ⁇ cm. From these results, it is preferable that the amount of the glass frit is set to 15% by mass or less.
- Example 5 a glass frit having a slightly larger particle size is used. For this reason, at a sintering temperature of 500 ° C, it is assumed that sufficient fluidity has occurred, and the volume resistance is sufficiently small. However, the sample sintered at 450 ° C has a slightly higher volume resistance. This phenomenon is presumed to be due to the fact that glass particles near the maximum diameter present in the glass frit hindered silver particle sintering.
- the size of the glass frit is preferably, for example, 2 ⁇ or less, more preferably 5 ⁇ or less.
- Example 4 using a glass frit at a working point of 475 ° C, there was no problem when the sintering temperature was 500 ° C, but some peeling was observed when sintering at 450 ° C. Was. However, no peeling occurred in any of the tape peeling tests, and it is considered that there is no practical problem.
- a sample of the prepared conductive paste was formed on a glass substrate (PP200 substrate manufactured by Asahi Glass Co., Ltd.) so as to have a predetermined thickness of 50 mm width x 90 mm length, and this was placed in a thermostat. After heating at 200 ° C for 30 minutes to volatilize the solvent, it was transferred to a sintering furnace at the sintering temperature (450 ° C and 500 ° C) shown in Tables 2 and 3 and heat-sintered for 30 minutes. . After sintering, the film thickness and volume resistance were measured to evaluate the conductivity. The film thickness was measured with a surface roughness measuring device (SURFCOM130A manufactured by Tokyo Seimitsu Co., Ltd.). A low resistivity meter (Loresta GP, manufactured by Mitsubishi Chemical Corporation) conforming to JI SK7 94 was used for volume resistance measurement.
- a glass substrate PP200 substrate manufactured by Asahi Glass Co., Ltd.
- the residual stress of the obtained coating film was measured by an X-ray residual stress measuring device.
- the C r ⁇ ray was excited at 30 kV and 20 mA, and the Ag (31 1) plane was used as the diffraction plane by s i ⁇ 2 ⁇ 3 ⁇ 4 (parallel tilt method).
- the constants used were a Young's modulus of 7500 OMPa and a Poisson's ratio of 0.38.
- the state of the glass substrate after sintering was visually observed with an optical microscope, and the applicability of the thick film was evaluated.
- a glass substrate in which no abnormalities such as cracks and cracks were observed was designated as ⁇
- a glass substrate in which cohesive failure was caused by residual stress of the paste was designated as X.
- the adhesiveness of the conductive paste to the substrate was tested.
- the samples used for the above-mentioned conductivity evaluation were cut in a grid pattern at 1 mm intervals, covered with an adhesive tape on the upper surface, and subjected to a tape peeling test 10 times to observe the degree of peeling. (Cross-cut peeling test)
- a tape peeling test was performed 10 times with an adhesive tape placed on the upper surface without making a cut, and the state of peeling was observed.
- the samples prepared at a sintering temperature of 500 ° C have a volume resistance of 3 ⁇ cm or less, which is the criterion for both Examples 7 to 13 and Comparative Example 2. It was obtained and showed high conductivity.
- Comparative Example 4 since the silver powder used was only spherical particles (A), the volume resistance exceeded 3 ⁇ ⁇ cm, and sufficient conductivity was not obtained.
- Working points of Examples 7 to 9 are 425. Using glass frit C, the glass frit amount was changed from 1% to 0.25% and evaluated.
- Example 7 in which the glass frit amount was 1%, the adhesion to the substrate was good, but when the film was coated thicker than 20 ⁇ m, the residual stress of the coating film increased, happensed.
- Examples 8 and 9 in which the glass frit amount was reduced to 0.5% and 0.25%, no abnormality was observed in the glass substrate even when the film thickness was increased to 40 m. It becomes possible.
- Example 10 evaluation was performed using a glass frit at a working point of 475 ° C., and changing the glass frit amount to 1% and 0.25%. As in the case of Examples 7 to 9, in Example 10 in which the glass frit amount is 1%, when applied to a thickness of 20 ⁇ m or more, cohesive rupture of the glass substrate occurs and thick film applicability is not achieved. . Also, since the working point of the glass frit is high, the sample sintered at 450 ° C has a slightly higher volume resistance.
- Example 12 glass frit having a slightly larger particle size is used. However, since the glass frit amount was relatively small as compared with Example 5, the glass flowed sufficiently even at 450 ° C sintering, and the conductivity was good. Regarding the thick film coating property, as in Examples 7 to 11, in Example 12 in which the glass frit amount was 1% by weight, the glass was broken when applied to a thickness of 20 im or more.
- the conductive paste according to the present invention is preferably used particularly in a field requiring high conductivity. Specifically, it is most suitable for forming electrodes of flat panel displays.
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Inorganic Chemistry (AREA)
- Conductive Materials (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE602004006951T DE602004006951T2 (de) | 2003-08-08 | 2004-07-13 | Leitfähige paste |
EP04747750A EP1560227B1 (en) | 2003-08-08 | 2004-07-13 | Conductive paste |
JP2005512911A JP4600282B2 (ja) | 2003-08-08 | 2004-07-13 | 導電性ペースト |
US10/531,697 US7556747B2 (en) | 2003-08-08 | 2004-07-13 | Electrically conductive pastes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-289607 | 2003-08-08 | ||
JP2003289607 | 2003-08-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005015573A1 true WO2005015573A1 (ja) | 2005-02-17 |
Family
ID=34131561
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/010286 WO2005015573A1 (ja) | 2003-08-08 | 2004-07-13 | 導電性ペースト |
Country Status (8)
Country | Link |
---|---|
US (1) | US7556747B2 (ja) |
EP (1) | EP1560227B1 (ja) |
JP (1) | JP4600282B2 (ja) |
KR (1) | KR100681113B1 (ja) |
DE (1) | DE602004006951T2 (ja) |
ES (1) | ES2287749T3 (ja) |
TW (1) | TWI329322B (ja) |
WO (1) | WO2005015573A1 (ja) |
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KR100868621B1 (ko) * | 2005-12-21 | 2008-11-13 | 이 아이 듀폰 디 네모아 앤드 캄파니 | 태양 전지 전극용 페이스트, 태양 전지 전극의 제조 방법,및 태양 전지 |
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- 2004-07-13 JP JP2005512911A patent/JP4600282B2/ja not_active Expired - Fee Related
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JP2007095503A (ja) * | 2005-09-29 | 2007-04-12 | Tokai Rubber Ind Ltd | 導電性ペースト |
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KR100982213B1 (ko) * | 2008-04-18 | 2010-09-14 | 계명대학교 산학협력단 | 태양전지용 전극 페이스트 조성물 및 이를 이용한 전극 형성방법 |
KR101283146B1 (ko) * | 2011-10-04 | 2013-07-05 | 엘지이노텍 주식회사 | 태양전지의 전면 전극용 페이스트 조성물 및 태양전지 |
CN110648781A (zh) * | 2019-09-10 | 2020-01-03 | 广州市儒兴科技开发有限公司 | 一种适用于分步丝网印刷的主栅正银浆料 |
Also Published As
Publication number | Publication date |
---|---|
DE602004006951D1 (de) | 2007-07-26 |
EP1560227A1 (en) | 2005-08-03 |
DE602004006951T2 (de) | 2008-02-28 |
EP1560227B1 (en) | 2007-06-13 |
TW200514099A (en) | 2005-04-16 |
US20060022173A1 (en) | 2006-02-02 |
KR100681113B1 (ko) | 2007-02-08 |
JP4600282B2 (ja) | 2010-12-15 |
ES2287749T3 (es) | 2007-12-16 |
JPWO2005015573A1 (ja) | 2006-10-05 |
US7556747B2 (en) | 2009-07-07 |
TWI329322B (en) | 2010-08-21 |
KR20060024321A (ko) | 2006-03-16 |
EP1560227A4 (en) | 2006-01-04 |
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