WO1996017025A1 - Encre conductrice - Google Patents

Encre conductrice Download PDF

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Publication number
WO1996017025A1
WO1996017025A1 PCT/EP1994/004005 EP9404005W WO9617025A1 WO 1996017025 A1 WO1996017025 A1 WO 1996017025A1 EP 9404005 W EP9404005 W EP 9404005W WO 9617025 A1 WO9617025 A1 WO 9617025A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductive ink
ink material
material according
binder system
pigment
Prior art date
Application number
PCT/EP1994/004005
Other languages
English (en)
Inventor
Oliver Crowhurst
Original Assignee
Eckart-Werke Standard Bronzepulver-Werke Carl Eckart Gmbh & Co.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eckart-Werke Standard Bronzepulver-Werke Carl Eckart Gmbh & Co. filed Critical Eckart-Werke Standard Bronzepulver-Werke Carl Eckart Gmbh & Co.
Priority to PCT/EP1994/004005 priority Critical patent/WO1996017025A1/fr
Priority to AU12419/95A priority patent/AU1241995A/en
Priority to EP95903312A priority patent/EP0794983A1/fr
Publication of WO1996017025A1 publication Critical patent/WO1996017025A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/52—Electrically conductive inks
    • 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
    • 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
    • H05K1/095—Dispersed materials, e.g. conductive pastes or inks for polymer thick films, i.e. having a permanent organic polymeric binder

Definitions

  • the invention relates to a conductive ink material comprising a vehicle/binder system containing a metallic pigment.
  • Known conductive ink materials or coatings are based on silver flakes as a metallic conductive pigment incorporated into a high viscosity vehicle/binder system having a formulation viscosity of about 10000 to 12000 cps (10000 - 12000 mPa.s).
  • binder systems for example are based on vinyl or acrylic resins dissolved in organic solvents which dry by evaporation.
  • Other known binder systems for example are based on epoxy or polyester acrylate systems comprised of 100 % of solids, which systems dry by UV-radiation curing.
  • a conductive ink material according to the invention is characterized in that the vehicle/binder system is a water base binder system having an application viscosity of less than 1000 cps (mPa.s) preferably of less than 500 most preferably of less than 300 cps (mPa.s) and that the pigment is a precious metal pigment or comprises at least a precious metal coating.
  • a water base binder system has a much lower application viscosity than the binder systems used with known conductive ink materials thereby promoting leafing of the metallic pigment resulting in greater alignment of conductive pigment at the surface of an ink film applied to a substrate material. Since metallic pigment flakes can orientate themselves parallel to the surface in a compact interlocking position conductivity of the ink film is considerably increased. The use of precious metal pigment additionally increases the conductivity of the ink film.
  • conductive ink materials having a formulation viscosity of more than 1000 cps prior to printing which by adding water can be decreased to fall within the above application viscosity range.
  • the conductive pigment's more random orientation throughout the ink film necessitates a higher film thickness when a known high viscosity vehicle/binder system is used.
  • the more random orientation in these known types of ink are caused first of all by the high viscosity impeding movability and thus leafing of the metallic pigment.
  • the lower surface tensions of the above mentioned organic solvents reduce the ability of the conductive pigment to align and orientate at the surface.
  • the higher film thickness required in connection with known conductive ink materials means a larger distance for the conductive pigment to travel or to leaf to the surface which also results in bad surface orientation and a low conductivity.
  • the conductive ink material according to the invention not only presents a much lower application viscosity but -additionally a higher surface tension due to the highly polar bonds of the water base binder system therewith promoting alignment of metallic pigment at the surface resulting in high conductivity. Accordingly lower application filmweights are needed to obtain a desired conductivity. Thus running speeds of coating or printing procedures are increased since the time an ink film must remain exposed to drying units is reduced.
  • Use of the conductive ink material according to the invention also allows to use liquid ink processes such as flexo or gravure printing processes and other low filmweight coating processes. Accordingly it is now e.g.
  • a conductive ink printed on a plastic film as part of a mechanism that acts as a voltage or charge tester which currently is required in connection with batteries .
  • the packaging for batteries can be printed by gravure process because of the high conductivity efficiency and fast drying speed of conductive ink material.
  • liquid ink printing processes should present an advantageous alternative to electrically depositing metals on substrate materials since electro-deposition is extremely expensive and much slower compared with highspeed printing processes.
  • a prefered water base binder system contains about 20 to 50% preferably 30 to 40 % per weight of a solid binder substance and a viscosity of preferably less than 300 cps (mPa.s), most preferably 20 to 200 cps (mPa.s).
  • a water base colloidal dispersion of aliphatic polyester and/or polyurethane is used.
  • a water base colloidal dispersion of an aliphatic polyester-polyurethane is obtainable as ALBERDINGK V, - U 610 W from ALBERDINGK BOLEY GMBH, Uerdingen, Germany, the type of dispersion being anionic and having about 9.5 % per weight of N-Methyl-2- pyrrolidon.
  • acrylics or water base polymers can be used depending on the substrate to be printed or coated.
  • Zinpol 146 available from ZINCHEM
  • the shape of the metallic pigment particles is not restrained to one predetermined profile, it is preferred to use metallic flakes in order to promote interlocking surface orientation.
  • metallic flakes are "Lamella" shaped metallic flake pigments, which preferably are silver flakes.
  • silver coated copper or other precious metals giving similar conductive properties can also be used.
  • the precious metal pigment preferably has been treated with fatty acids, or compounds of fatty acids like fatty alcohols, preferably with stearic acid. However, palmitic acid should also be suited.
  • the flakes have preferably low particle size compared with known conductive ink materials which has been determined according to the Cilas-method:
  • the metallic pigment have a particle size of less than 3.5 microns, 50% of the metallic pigment has a particle size of less than 10.5 microns and 90% of the metallic pigment has a particle size of less than 21.0 microns.
  • the particle size is:
  • the low particle size has been found to considerably improve the conductive properties of the ink film.
  • Adding a modified hydrocarbon surfactant composition available from Rit-Chem Co., Inc. of Pleasantville, N.Y., USA, under the tradename ZEROFOME NS-31F into the water base vehicle/binder system reduces or prevents foam generation when preparing the ink material.
  • a preferred formulation of the conductive ink material according to the invention comprises 2,4,7,9-tetramethyl- 5decyn-4,7-diol (75% in ethylene glycol) (available as Surfynol 104 H) and/or modified nonylphenoxypoly(etyleneoxy)ethanol which is available from RHONE-POULENC, Cranbury, New Jersey, USA, under the domestic tradename IGEPAL CTA 639 W SURFACTANT and under the export tradename ANTAROX CTA-639 W SURFACTANT as a wetting agent.
  • a preferred formulation of the inventive conductive ink material comprises 15 to 45 % per weight of a water base binder system, 0.0 to 6.5 % per weight of a wetting agent, 20 to 80 % per weight of a metallic pigment and 0 to 20 % per weight of water.
  • the conductive ink material preferably comprises 0.1 to 3.5 % per weight of 2,4,7,9-tetramethyl- 5decyn-4,7-diol (75 % in ethylene glycol).
  • Another preferable formulation of the conductive ink material comprises 0.1 to 3.0 % per weight of modified nonylphenoxypoly(ethyleneoxy)ethanol.
  • a mostly preferred formulation of the conductive ink according to the invention is characterized by: - 31.7 % of a water base colloidal dispersion of aliphatic polyester/polyurethane - 0.5 % of a modified hydrocarbon surfactant composition
  • silver flake (silver 95 %, stearic acid 5%, e.g. "Alcan Silver Flake 750")
  • Another preferred formulation comprises as water base vehicle binder system the dispersion Zinpol 146 or U 610 W which have already been identified.
  • a method for preparing conductive ink according to the invention consists in separately preparing a vehicle component and a pasteous component comprising the metallic pigment. Firstly the vehicle component is weighed into a suitable vessel for water base ink coating manufacture. A cavitational head type mixer is then preferably used to mix the defoamer, which preferably is 2,4,7,9 tetramethyl- 5decyn-4,7-diol (75 % in ethylene glycol), which is added to the vehicle component while mixing slowly.
  • the defoamer which preferably is 2,4,7,9 tetramethyl- 5decyn-4,7-diol (75 % in ethylene glycol)
  • a wetting aid preferably modified nonylphenoxypoly(ethyleneoxy)ethanol is blended with the water component according to the above given formulation to form a gel. This is preferably done on the similar mixing equipment. Also modified nonylphenoxypoly(ethyleneoxy)ethanol is added. The gel so obtained is then added to the conductive pigment, which is pre-weighed in a drum of suitable size. The gel comprised of wetting aids and water is poured on top of the pigment and the drum is sealed. The volume of pigment and gel should occupy 50 - 75 % of the drum. The drum is then rotated on a drum roller for about 20 minutes or until the substance forms a homogenous paste.
  • the paste containing the metallic pigment is then added to the original vessel containing the vehicle component while agitating slowly preferably using the cavitational head type mixer.
  • a vacuum sealed vessel may be used.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Conductive Materials (AREA)

Abstract

L'invention concerne une encre conductrice comprenant un système véhicule/liant contenant un pigment métallique; cette encre selon l'invention peut être appliquée en petites couches légères tout en présentant une conductivité élevée et en montrant une vitesse rapide de séchage, et elle est caractérisée en ce que le système véhicule/liant est un système de liant à base d'eau possédant, lors de l'application, une viscosité inférieure à 1000 cps (mPa.s), de préférence inférieure à 500 cps (mPa.s), et en ce que le pigment est un pigment de métal précieux ou qu'il comprend au moins un revêtement de métal précieux.
PCT/EP1994/004005 1994-12-01 1994-12-01 Encre conductrice WO1996017025A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/EP1994/004005 WO1996017025A1 (fr) 1994-12-01 1994-12-01 Encre conductrice
AU12419/95A AU1241995A (en) 1994-12-01 1994-12-01 Conductive ink
EP95903312A EP0794983A1 (fr) 1994-12-01 1994-12-01 Encre conductrice

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1994/004005 WO1996017025A1 (fr) 1994-12-01 1994-12-01 Encre conductrice

Publications (1)

Publication Number Publication Date
WO1996017025A1 true WO1996017025A1 (fr) 1996-06-06

Family

ID=8165921

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/004005 WO1996017025A1 (fr) 1994-12-01 1994-12-01 Encre conductrice

Country Status (3)

Country Link
EP (1) EP0794983A1 (fr)
AU (1) AU1241995A (fr)
WO (1) WO1996017025A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6599353B2 (en) 2000-04-20 2003-07-29 Berol Corporation Shear-thinning writing compositions, writing instruments, and methods
WO2005012445A2 (fr) * 2003-06-30 2005-02-10 The Board Of Trustees Of The University Of Illinois Encres conductrices
EP1862511A1 (fr) * 2005-03-22 2007-12-05 Seiko Epson Corporation Pigment métallique, dispersion liquide de pigment, composition d'encre à pigment métallique et procédé d'impression par jet d'encre
EP1894213A1 (fr) * 2005-06-09 2008-03-05 National Starch and Chemical Company Conducteurs electriques imprimables aqueux

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508922A1 (fr) * 1981-07-06 1983-01-07 Rca Corp Encres electriquement conductrices et resistantes, pouvant etre cuites dans l'air, et leur application a la realisation de structures multicouches de circuits electroniques
EP0230303A2 (fr) * 1986-01-22 1987-07-29 Bee Chemical Company Revêtement de protection contre les interférences d'ondes électromagnétiques
EP0462720A1 (fr) * 1990-06-15 1991-12-27 Ford Motor Company Limited Compositions d'encre et méthode pour mettre des indices sur du verre

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508922A1 (fr) * 1981-07-06 1983-01-07 Rca Corp Encres electriquement conductrices et resistantes, pouvant etre cuites dans l'air, et leur application a la realisation de structures multicouches de circuits electroniques
EP0230303A2 (fr) * 1986-01-22 1987-07-29 Bee Chemical Company Revêtement de protection contre les interférences d'ondes électromagnétiques
EP0462720A1 (fr) * 1990-06-15 1991-12-27 Ford Motor Company Limited Compositions d'encre et méthode pour mettre des indices sur du verre

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6599353B2 (en) 2000-04-20 2003-07-29 Berol Corporation Shear-thinning writing compositions, writing instruments, and methods
WO2005012445A2 (fr) * 2003-06-30 2005-02-10 The Board Of Trustees Of The University Of Illinois Encres conductrices
WO2005012445A3 (fr) * 2003-06-30 2005-04-14 Trustees Of The University Of Illinois Encres conductrices
US7097788B2 (en) 2003-06-30 2006-08-29 The Board Of Trustees Of The University Of Illinois Conducting inks
EP1862511A1 (fr) * 2005-03-22 2007-12-05 Seiko Epson Corporation Pigment métallique, dispersion liquide de pigment, composition d'encre à pigment métallique et procédé d'impression par jet d'encre
EP1862511A4 (fr) * 2005-03-22 2011-05-04 Seiko Epson Corp Pigment métallique, dispersion liquide de pigment, composition d'encre à pigment métallique et procédé d'impression par jet d'encre
US8313572B2 (en) 2005-03-22 2012-11-20 Seiko Epson Corporation Metallic pigment, pigment dispersion liquid, metallic pigment ink composition, and ink jet recording method
EP3006516A1 (fr) * 2005-03-22 2016-04-13 Seiko Epson Corporation Procede d'enregistrement a jet d'encre
EP1894213A1 (fr) * 2005-06-09 2008-03-05 National Starch and Chemical Company Conducteurs electriques imprimables aqueux
EP1894213A4 (fr) * 2005-06-09 2009-07-15 Nat Starch Chem Corp Conducteurs electriques imprimables aqueux

Also Published As

Publication number Publication date
EP0794983A1 (fr) 1997-09-17
AU1241995A (en) 1996-06-19

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