WO1990001053A1 - Encre electriquement conductrice pour imprimantes a jet d'encre - Google Patents

Encre electriquement conductrice pour imprimantes a jet d'encre Download PDF

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Publication number
WO1990001053A1
WO1990001053A1 PCT/DE1989/000467 DE8900467W WO9001053A1 WO 1990001053 A1 WO1990001053 A1 WO 1990001053A1 DE 8900467 W DE8900467 W DE 8900467W WO 9001053 A1 WO9001053 A1 WO 9001053A1
Authority
WO
WIPO (PCT)
Prior art keywords
ink
organic
additives
organic additives
solvent
Prior art date
Application number
PCT/DE1989/000467
Other languages
German (de)
English (en)
Inventor
Lutz Vite
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1990001053A1 publication Critical patent/WO1990001053A1/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
    • C09D11/30—Inkjet printing inks
    • C09D11/36—Inkjet printing inks based on non-aqueous solvents

Definitions

  • the invention relates to an ink for inkjet printers, which consists of at least one organic solvent, at least one highly purified dye and optionally other auxiliaries.
  • the color transfer is achieved by ejecting fine ink droplets from the nozzles of a print head onto the medium to be printed, which is usually paper.
  • the nozzles which are usually arranged in matrix form in the print head, are connected via fine ink channels to an ink jet generating device and further to an ink reservoir.
  • the ink jet or the spinning off of an ink droplet is generated by a piezoelectric element which surrounds part of the ink channel in a ring.
  • inks suitable for inkjet printers Corresponding requirements are placed on inks suitable for inkjet printers.
  • the viscosity and surface tension of the inks must reach certain values in order to achieve a good drip flight image and thus a good print image. These values must remain constant so that the print quality does not change even after long use of the ink changed or worsened.
  • the ink solutions must therefore be both chemically and physically stable. There must be no deposits inside the print head that could clog the fine ink channels and nozzles.
  • the ink In the case of bubble jet printers, the ink must also be thermally stable in order to be able to withstand the short-term high temperatures at the thermal converter element.
  • the inks should also not contain any ions which assist the corrosion of these metal parts. Above all, alkali chloride and alkali sulfate are dangerous and should be avoided. As a result of the ever increasing demands, the inks are provided in increasingly better and purer quality, since increasingly purer starting compounds are used.
  • the object of the present invention is therefore to provide an ink, in particular for piezo-jet printers, which has a required electrical conductivity without showing the disadvantages associated with the charge carriers.
  • an ink of the type mentioned above in that, in order to achieve a defined electrical conductivity of the ink, further organic additives are added which generate charge carriers (ions) when dissolved in the at least one solvent.
  • these organic additives are quaternary ammonium compounds of the general formula NH 4-a R a A, where in which the radicals R independently of one another represent alkyl or aryl radicals, a is the number 1, 2 or 3 and A is a suitable anion which is selected such that the ammonium compound in the ink is stable without decomposition.
  • purely organic additives are now used to achieve electrical conductivity. These can be used in inks with a variety of organic solvents and are therefore also suitable for special ink compositions. Compared to the iodides and bromides mentioned above, there is also a significant cost saving for the ink composition.
  • the hydroxides of tetraalkyl or tetraarylammonium compounds are particularly suitable. These also form chemically stable solutions in basic. Monoalkyl, dialkyl and trialkylammonium or corresponding arylammonium compounds are also suitable in less basic ink solutions.
  • ammonium compounds of the general formula are used as organic additives
  • Sulfur atom of the XSO 3 group is an organic radical, for which at least the same selection applies as for R.
  • Organic additives in which X comprises an at least partially halogenated group are also used with good success.
  • X may represent a trifluoromethyl group or a larger group containing such a trifluoromethyl group.
  • Corresponding chlorinated or brominated organic groups are also possible.
  • the following is a small selection of suitable compounds which, according to the invention, can increase the conductivity of inks as organic additives. These are only examples, so that the list cannot be exhaustive.
  • the invention can be carried out in many embodiments in accordance with the general structural formulas given. Good results show, for example:
  • Tetramethylammonium hydroxide Tetraethylammonium hydroxide
  • the electrolytes or conductivity additives given by way of example are on the order of approximately 2 percent by weight mixed with the ink.
  • the electrical that can be achieved are on the order of approximately 2 percent by weight mixed with the ink.
  • the invention provides a way by which the range of dyes possible for ink compositions is significantly expanded. Zuifl example, solvent dyes can now also be used.
  • the inks can be constructed on an anhydrous basis or, like newer ink compositions, can contain up to 10 percent by weight of water. Such more water-containing inks then contain a poly- or diethylene glycol as a viscosity-increasing additive.
  • the ink according to the invention is particularly suitable for printers which operate according to the piezo-jet process, but can also be used for bubble-oet processes and other ink-jet processes.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

Il est proposé une encre pour imprimante à jet d'encre comportant, non seulement au moins un solvant organique, au moins un colorant hautement purifié et le cas échéant d'autres produits auxiliaires, mais aussi d'autres additifs organiques permettant d'obtenir une conductibilité électrique déterminée et produisant des ions après dissolution dans l'un des solvants au moins. Les composés quaternaires de l'ammonium, comme l'hydroxyde d'ammonium tétraalkyle ou l'hydroxyde d'ammonium tétraaryle ou d'autres sels organiques stables dans la solution d'encre, employés comme additifs de l'encre, permettent d'obtenir une bonne conductibilité électrique. Les anions sont choisis de manière que l'encre ne provoque pas de corrosion des parties de l'imprimante qui contiennent du métal ou des parties à imprimer qui en contiennent également. L'invention permet d'élargir de manière significative l'éventail du choix des solvants et des colorants à employer pour les encres et assure une conductibilité électrique même avec des produits de base ou des colorants de l'encre très purifiés.
PCT/DE1989/000467 1988-07-22 1989-07-12 Encre electriquement conductrice pour imprimantes a jet d'encre WO1990001053A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3825007.1 1988-07-22
DE3825007A DE3825007A1 (de) 1988-07-22 1988-07-22 Elektrisch leitfaehige tinte fuer tintenstrahldrucker

Publications (1)

Publication Number Publication Date
WO1990001053A1 true WO1990001053A1 (fr) 1990-02-08

Family

ID=6359354

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1989/000467 WO1990001053A1 (fr) 1988-07-22 1989-07-12 Encre electriquement conductrice pour imprimantes a jet d'encre

Country Status (2)

Country Link
DE (1) DE3825007A1 (fr)
WO (1) WO1990001053A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998027170A1 (fr) * 1996-12-19 1998-06-25 Videojet Systems International, Inc. Composition d'encre pour jet

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1495785A (en) * 1974-03-14 1977-12-21 Xerox Corp Electrically conductive inks
JPS62109870A (ja) * 1985-11-08 1987-05-21 Tokyo Ohka Kogyo Co Ltd インクジエツト記録用インク組成物
JPS62265370A (ja) * 1986-05-12 1987-11-18 Mitsubishi Chem Ind Ltd 記録液
EP0259088A2 (fr) * 1986-08-27 1988-03-09 Hewlett-Packard Company Encres pour l'impression par jet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1495785A (en) * 1974-03-14 1977-12-21 Xerox Corp Electrically conductive inks
JPS62109870A (ja) * 1985-11-08 1987-05-21 Tokyo Ohka Kogyo Co Ltd インクジエツト記録用インク組成物
JPS62265370A (ja) * 1986-05-12 1987-11-18 Mitsubishi Chem Ind Ltd 記録液
EP0259088A2 (fr) * 1986-08-27 1988-03-09 Hewlett-Packard Company Encres pour l'impression par jet

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, Volume 107, No. 22, 30 November 1987, (Columbus, Ohio, US), KOMATSUBARA YUKIO et al., "Ink-Jet Recording Ink Composition", page 122, Abstract 200638d; & JP,A,62 109 870 (21 May 1987). *
CHEMICAL ABSTRACTS, Volume 108, No. 14, 4 April 1988, (Columbus, Ohio, US), MIURA KONOE et al., "Water-Thinned Inks", page 107, Abstract 114394k; & JP,A,62 265 370 (18 November 1987). *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998027170A1 (fr) * 1996-12-19 1998-06-25 Videojet Systems International, Inc. Composition d'encre pour jet
CN1106434C (zh) * 1996-12-19 2003-04-23 录象射流***国际有限公司 喷墨印刷油墨组合物

Also Published As

Publication number Publication date
DE3825007A1 (de) 1990-01-25

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