EP0660193B1 - Utilisation de pigments d'oxydes de fer comme stabilisateurs de la charge dans des révélateurs électrostatiques - Google Patents

Utilisation de pigments d'oxydes de fer comme stabilisateurs de la charge dans des révélateurs électrostatiques Download PDF

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Publication number
EP0660193B1
EP0660193B1 EP94118845A EP94118845A EP0660193B1 EP 0660193 B1 EP0660193 B1 EP 0660193B1 EP 94118845 A EP94118845 A EP 94118845A EP 94118845 A EP94118845 A EP 94118845A EP 0660193 B1 EP0660193 B1 EP 0660193B1
Authority
EP
European Patent Office
Prior art keywords
charge
iron oxide
toner
iron
electrostatic
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP94118845A
Other languages
German (de)
English (en)
Other versions
EP0660193A1 (fr
Inventor
Karin Heidrun Dr. Beck
Rainer Dr. Dyllick-Brenzinger
Joerg Dr. Schröder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of EP0660193A1 publication Critical patent/EP0660193A1/fr
Application granted granted Critical
Publication of EP0660193B1 publication Critical patent/EP0660193B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/083—Magnetic toner particles
    • G03G9/0831—Chemical composition of the magnetic components
    • G03G9/0833—Oxides
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/097—Plasticisers; Charge controlling agents
    • G03G9/09708—Inorganic compounds

Definitions

  • the present invention relates to the new use of Iron oxide pigments ⁇ -iron (III) oxide and / or ⁇ -iron (III) oxide hydrate, which have an average particle diameter of 0.005 to Have 0.05 microns as charge stabilizers in electrostatic Toners.
  • Toner particles are used to develop the electrostatic image via a "magnetic brush", that's one along the field lines Sector magnet aligned carrier particles, to the photoconductor roller transported.
  • the toner particles adhere electrostatically on the carrier particles and received during transport in the Magnetic field due to friction opposite the carrier particles electrostatic charge.
  • the magnetic brush toner particles transferred to the photoconductor roller result in a "Toner image”, which is then transferred to paper or film and is fixed.
  • the toner In order to obtain strong, sharply contoured images, the toner to stabilize its electrostatic charge. Charge controlling agents added.
  • the invention was based on the object of new charge stabilizers to provide with advantageous application properties.
  • iron oxide pigments ⁇ -iron (III) oxide ⁇ -Fe 2 O 3 hematite; CI Pigment Red 101; CI 77491
  • ⁇ -iron (III) oxide hydrates ⁇ -FeO (OH) xH 2 O x about 1 to 7; CI Pigment Yellow 42; CI 77492; Goethit
  • charge stabilizers found in electrostatic toners ⁇ -iron (III) oxide ⁇ -Fe 2 O 3 (hematite; CI Pigment Red 101; CI 77491) and ⁇ -iron (III) oxide hydrates ⁇ -FeO (OH) xH 2 O (x about 1 to 7; CI Pigment Yellow 42; CI 77492; Goethit) and mixtures thereof as charge stabilizers found in electrostatic toners.
  • the iron oxide pigments are finely divided, more transparent Form (highly transparent to semi-transparent) and show one average particle diameter of 0.005 to 0.05 ⁇ m, preferred 0.01 to 0.05 ⁇ m.
  • the values mentioned refer to acicular pigment particles perpendicular to the diameter Longitudinal expansion.
  • the iron oxide pigments according to the invention can advantageously be used as Charge stabilizers in the manufacture of electrostatic Toners for one and especially two component developers be used.
  • the main components of an electrostatic toner are usually the binder and the charge stabilizer, the usually 0.01 to 10% by weight, in particular 0.01 to 5% by weight of the finished toner.
  • the toner binders are mostly thermoplastic polymers with softening points from 40 to 200 ° C, preferably 50 to 130 ° C and particularly preferably 65 to 115 ° C.
  • Suitable binders are polystyrene, copolymers made of styrene and an acrylate or methacrylate, copolymers Styrene and butadiene and / or acrylonitrile, polyacrylates, polymethacrylates, Copolymers of an acrylate or methacrylate and Vinyl chloride or vinyl acetate, polyvinyl chloride, copolymers Vinyl chloride and vinylidene chloride or vinyl acetate, polyester resins, Epoxy resins, polyamides and polyurethanes.
  • the electrostatic toners can also be others Components such as waxes, flow agents, colorants and magnetic attractable materials included.
  • Organic dyes or pigments such as Nigrosine, aniline blue, 2,9-dimethylquinacridone, C.I. Disperse Red 15 (C.I. 60 710), C.I. Solvent Red 19 (C.I. 26 050), C.I. pigment Blue 15 (C.I. 74 160), C.I. Pigment Blue 22 (C.I. 69 810) or C.I. Solvent Yellow 16 (C.I. 12 700) or inorganic pigments, such as soot, red lead, yellow lead oxide or chrome yellow. Generally exceeds the amount of colorant in the toner not 15% by weight based on the weight of the toner.
  • the magnetically attractable materials can be, for example, iron, nickel, chromium oxide, iron oxide or a ferrite of the formula MeFe 2 O 4 , in which Me is a divalent metal, for example iron, cobalt, zinc, nickel or manganese.
  • the toner production can be done using the invention
  • Charge stabilizers are carried out as usual, e.g. by Mixing the ingredients in solid form in a kneader and subsequent pulverization or by dispersing the others Components in the molten binder using known ones Mixing or kneading machines, then cooling the Melt to a solid mass and grind to particles of the desired Particle size (usually 0.1 to 50 ⁇ m).
  • the toner preparation thus obtained can directly, e.g. in a xerographic imaging system, be used or first a drying process, for example spray drying, freeze drying or Evaporation of the solvent, followed by grinding to be subjected to the desired particle size.
  • Iron oxide pigments have good overall application properties out. They are insensitive to moisture, thermally stable up to 180 ° C, and above all they give a toner preparation a favorable electrostatic charge profile, i.e. the toner can be charged quickly and highly. Moreover keep this charge constant at a high level.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Developing Agents For Electrophotography (AREA)

Claims (2)

  1. Utilisation des pigments d'oxyde de fer que sont l'oxyde de α-fer(III) et/ou les oxydes de α-fer(III) hydratés et qui présentent un diamètre de particule moyen de 0,005-0,05 µm, en tant que stabilisateur de charge dans des toners électrostatiques.
  2. Toner électrostatique, contenant les pigments d'oxyde de fer que sont l'oxyde de α-fer(III) ou les oxydes de α-fer(III) hydratés et qui présentent un diamètre de particule moyen de 0,005-0,05 µm, en tant que stabilisateur de charge.
EP94118845A 1993-12-08 1994-11-30 Utilisation de pigments d'oxydes de fer comme stabilisateurs de la charge dans des révélateurs électrostatiques Expired - Lifetime EP0660193B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4341726A DE4341726A1 (de) 1993-12-08 1993-12-08 Verwendung von Metalloxidpigmenten als Ladungsstabilisatoren in elektrostatischen Tonern
DE4341726 1993-12-08

Publications (2)

Publication Number Publication Date
EP0660193A1 EP0660193A1 (fr) 1995-06-28
EP0660193B1 true EP0660193B1 (fr) 2000-03-15

Family

ID=6504404

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94118845A Expired - Lifetime EP0660193B1 (fr) 1993-12-08 1994-11-30 Utilisation de pigments d'oxydes de fer comme stabilisateurs de la charge dans des révélateurs électrostatiques

Country Status (4)

Country Link
EP (1) EP0660193B1 (fr)
JP (1) JPH07199544A (fr)
CA (1) CA2137502A1 (fr)
DE (2) DE4341726A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19628933A1 (de) * 1995-07-19 1997-01-23 Iwatsu Electric Co Ltd Magnetischer Toner zum Entwickeln eines latenten Bildes
US5830616A (en) * 1995-07-19 1998-11-03 Iwatsu Electric Co., Inc. Magnetic latent image developing toner

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU503243B2 (en) * 1975-02-21 1979-08-30 Kanebo Limited Toner for electrostatic printing of sheetlike materials
US4404270A (en) * 1980-05-22 1983-09-13 Hitachi Chemical Company, Ltd. Positively chargeable powdered electrophotographic toner containing dialkyl tin oxide charge control agent
JPS5866949A (ja) * 1981-10-16 1983-04-21 Fuji Photo Film Co Ltd カプセルトナ−
US5147744A (en) * 1991-02-28 1992-09-15 Xerox Corporation MICR processes with colored encapsulated compositions
US5266432A (en) * 1991-03-01 1993-11-30 Kao Corporation Hydrophobic polyester toner composition
FI89537C (fi) * 1992-01-09 1993-10-11 Soundek Oy Maetanordning foer maetning av dragspaenningen av en optisk fiber eller motsvarande traod

Also Published As

Publication number Publication date
DE4341726A1 (de) 1995-06-14
DE59409208D1 (de) 2000-04-20
CA2137502A1 (fr) 1995-06-09
EP0660193A1 (fr) 1995-06-28
JPH07199544A (ja) 1995-08-04

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