GB1527291A - Magnetic developer powder for developing electrostatic latent image and method of making same - Google Patents

Magnetic developer powder for developing electrostatic latent image and method of making same

Info

Publication number
GB1527291A
GB1527291A GB620576A GB620576A GB1527291A GB 1527291 A GB1527291 A GB 1527291A GB 620576 A GB620576 A GB 620576A GB 620576 A GB620576 A GB 620576A GB 1527291 A GB1527291 A GB 1527291A
Authority
GB
United Kingdom
Prior art keywords
particles
resistivity
specified
binder
conductive
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
Application number
GB620576A
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.)
Proterial Ltd
Original Assignee
Hitachi Metals Ltd
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 Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Publication of GB1527291A publication Critical patent/GB1527291A/en
Expired legal-status Critical Current

Links

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
    • G03G9/0838—Size of magnetic components
    • 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
    • G03G9/0827—Developers with toner particles characterised by their shape, e.g. degree of sphericity
    • 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
    • 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
    • G03G9/09—Colouring agents for toner particles
    • G03G9/0902—Inorganic compounds
    • G03G9/0904—Carbon black
    • 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
    • G03G9/09725—Silicon-oxides; Silicates

Landscapes

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

Abstract

1527291 Electro-photographic developer HITACHI METALS Ltd 17 Feb 1976 [21 Feb 1975] 06205/76 Heading G2C A developer powder of resistivity between 10<SP>2</SP> and 10<SP>8</SP> ohm cm comprises spherical particles of resistivity of not more than 10<SP>12</SP> ohm cm and comprising a polymeric binder, magnetic particles and electrically conductive particles in which are embedded in the surface futher conductive particles so that the resistivity of the surface is less than the core. Specified binders are (a) a mixture of wax and ethylene/vinyl acetate copolymer, (b) polystyrene and (c) epoxy resin whereas C black is the specified conductive particle and magnetite, ferrites, chromium oxide are specified magnetic particles. A dry lubricant such as silica or alumina may be added to the particles. The powder may be made by mixing the binder, magnetic particles and conductive particles at a temperature at which the binder fuses, pulverizing the cooled mixture and dispersing the particles produced into a hot air stream to produce spherical particles, adding the 2<SP>cd</SP> conductive particles and mixing in a hot air stream to embed the 2<SP>cd</SP> particles in the surface.
GB620576A 1975-02-21 1976-02-17 Magnetic developer powder for developing electrostatic latent image and method of making same Expired GB1527291A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2098975A JPS5347172B2 (en) 1975-02-21 1975-02-21

Publications (1)

Publication Number Publication Date
GB1527291A true GB1527291A (en) 1978-10-04

Family

ID=12042531

Family Applications (1)

Application Number Title Priority Date Filing Date
GB620576A Expired GB1527291A (en) 1975-02-21 1976-02-17 Magnetic developer powder for developing electrostatic latent image and method of making same

Country Status (5)

Country Link
JP (1) JPS5347172B2 (en)
DE (1) DE2606936B2 (en)
DK (1) DK145048C (en)
FR (1) FR2301847A1 (en)
GB (1) GB1527291A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4482623A (en) * 1977-09-09 1984-11-13 Hitachi Metals, Ltd. Preparation method of magnetic toner

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51101535A (en) * 1975-03-04 1976-09-08 Toyo Ink Mfg Co
GB1598357A (en) * 1976-12-23 1981-09-16 Toppan Printing Co Ltd Dry planographic printing apparatus and method
JPS53117432A (en) * 1977-03-23 1978-10-13 Matsushita Graphic Commun Syst Inc Image formation method
JPS5411740A (en) * 1977-06-29 1979-01-29 Hitachi Metals Ltd Magnetic toner
JPS5441730A (en) * 1977-09-09 1979-04-03 Hitachi Metals Ltd Magnetic toner for heat fixing
US4133774A (en) * 1977-09-29 1979-01-09 Reprographic Materials, Inc. Process for preparing direct imaging pressure fixable magnetic toners
JPS5511262A (en) * 1978-07-12 1980-01-26 Hitachi Metals Ltd Magnetic toner
JPH02256064A (en) * 1979-02-22 1990-10-16 Fuji Xerox Co Ltd Production of one-component magnetic toner
JPS55157755A (en) * 1979-05-28 1980-12-08 Canon Inc Developing method
JPS5670556A (en) * 1979-11-14 1981-06-12 Minolta Camera Co Ltd Production of magnetic particle for electrophotographic developer
JPS5868048A (en) * 1981-10-19 1983-04-22 Matsushita Electric Ind Co Ltd Electrostatic image developing toner

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3563734A (en) * 1964-10-14 1971-02-16 Minnesota Mining & Mfg Electrographic process
NL159795C (en) * 1968-07-22 Minnesota Mining & Mfg
JPS4843821A (en) * 1971-10-07 1973-06-25
JPS49112279A (en) * 1973-02-28 1974-10-25

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4482623A (en) * 1977-09-09 1984-11-13 Hitachi Metals, Ltd. Preparation method of magnetic toner

Also Published As

Publication number Publication date
DK71576A (en) 1976-08-22
FR2301847B1 (en) 1981-09-04
FR2301847A1 (en) 1976-09-17
JPS5196331A (en) 1976-08-24
DE2606936A1 (en) 1976-09-16
JPS5347172B2 (en) 1978-12-19
DK145048C (en) 1983-02-21
DE2606936B2 (en) 1979-05-10
DK145048B (en) 1982-08-09

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee