CA2375298A1 - Electrographic methods using hard magnetic carrier particles - Google Patents

Electrographic methods using hard magnetic carrier particles Download PDF

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Publication number
CA2375298A1
CA2375298A1 CA002375298A CA2375298A CA2375298A1 CA 2375298 A1 CA2375298 A1 CA 2375298A1 CA 002375298 A CA002375298 A CA 002375298A CA 2375298 A CA2375298 A CA 2375298A CA 2375298 A1 CA2375298 A1 CA 2375298A1
Authority
CA
Canada
Prior art keywords
shell
methods
hard magnetic
carrier particles
magnetic carrier
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.)
Granted
Application number
CA002375298A
Other languages
French (fr)
Other versions
CA2375298C (en
Inventor
Eric C. Stelter
Robert D. Fields
Thomas A. Jadwin
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.)
Eastman Kodak Co
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2375298A1 publication Critical patent/CA2375298A1/en
Application granted granted Critical
Publication of CA2375298C publication Critical patent/CA2375298C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
    • G03G15/0921—Details concerning the magnetic brush roller structure, e.g. magnet configuration
    • G03G15/0928—Details concerning the magnetic brush roller structure, e.g. magnet configuration relating to the shell, e.g. structure, composition
    • 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
    • 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
    • G03G9/09716—Inorganic compounds treated with organic compounds
    • 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
    • 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
    • G03G9/09733—Organic compounds
    • 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
    • G03G9/10—Developers with toner particles characterised by carrier particles
    • G03G9/107—Developers with toner particles characterised by carrier particles having magnetic components
    • G03G9/108—Ferrite carrier, e.g. magnetite
    • G03G9/1085—Ferrite carrier, e.g. magnetite with non-ferrous metal oxide, e.g. MgO-Fe2O3

Abstract

Disclosed are methods and apparatus for electrographic development which utilize a rotating magnetic core, a toner shell disposed around the rotating magnetic core, and developer compositions disposed on the toner shell which include a hard magnetic material, such as a strontium ferrite. The shell in embodiments has an outer surface with a surface roughness Ra of less than 32 microinches. The methods and apparatus do not require special manufacturing steps to place surface roughness or irregularities on the shell, and, thus, can provide the same or better image quality with relatively less complex manufacturing steps and at reduced cost.
CA002375298A 2000-05-17 2001-05-11 Electrographic methods using hard magnetic carrier particles Expired - Fee Related CA2375298C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US20494200P 2000-05-17 2000-05-17
US60/204,942 2000-05-17
PCT/US2001/015420 WO2001088617A2 (en) 2000-05-17 2001-05-11 Electrographic methods using hard magnetic carrier particles

Publications (2)

Publication Number Publication Date
CA2375298A1 true CA2375298A1 (en) 2001-11-22
CA2375298C CA2375298C (en) 2005-07-12

Family

ID=22760109

Family Applications (2)

Application Number Title Priority Date Filing Date
CA002375298A Expired - Fee Related CA2375298C (en) 2000-05-17 2001-05-11 Electrographic methods using hard magnetic carrier particles
CA002375255A Abandoned CA2375255A1 (en) 2000-05-17 2001-05-14 Electrographic developer compositions and method for development of an electrostatic image

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA002375255A Abandoned CA2375255A1 (en) 2000-05-17 2001-05-14 Electrographic developer compositions and method for development of an electrostatic image

Country Status (7)

Country Link
US (2) US20010046635A1 (en)
EP (2) EP1156373A1 (en)
JP (2) JP2003533740A (en)
AU (2) AU2001261520A1 (en)
CA (2) CA2375298C (en)
DE (1) DE60126015T2 (en)
WO (2) WO2001088617A2 (en)

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US6610451B2 (en) * 2000-12-26 2003-08-26 Heidelberger Druckmaschinen Ag Development systems for magnetic toners having reduced magnetic loadings
US6797448B2 (en) * 2001-05-14 2004-09-28 Eastman Kodak Company Electrophotographic toner and development process with improved image and fusing quality
EP1376250A3 (en) * 2002-06-24 2009-04-08 Eastman Kodak Company Electrophotographic toner and development process using chemically prepared toner
US7157202B1 (en) 2003-09-23 2007-01-02 Eastman Kodak Company Method and apparatus for reducing densification of multiple component electrographic developer
US20050095522A1 (en) * 2003-10-30 2005-05-05 Eastman Kodak Company Control of charge-to-mass of toner using silica blends
US20050271961A1 (en) * 2004-03-05 2005-12-08 Jadwin Thomas A Substrate and near infrared absorbing toner
WO2005088406A2 (en) * 2004-03-09 2005-09-22 Eastman Kodak Company Powder coating using an electromagnetic brush
US20060150902A1 (en) * 2004-03-09 2006-07-13 Eastman Kodak Company Powder coating apparatus and method of powder coating using an electromagnetic brush
US7426361B2 (en) * 2005-09-01 2008-09-16 Eastman Kodak Company Developer mixing apparatus having four ribbon blenders
WO2007142047A1 (en) * 2006-06-09 2007-12-13 Tokuyama Corporation Dry-process fine silica particle
US20080070146A1 (en) 2006-09-15 2008-03-20 Cabot Corporation Hydrophobic-treated metal oxide
US8435474B2 (en) 2006-09-15 2013-05-07 Cabot Corporation Surface-treated metal oxide particles
US8202502B2 (en) 2006-09-15 2012-06-19 Cabot Corporation Method of preparing hydrophobic silica
US8455165B2 (en) 2006-09-15 2013-06-04 Cabot Corporation Cyclic-treated metal oxide
US7885584B2 (en) * 2007-06-29 2011-02-08 Eastman Kodak Company Self-cleaning electrophotographic toning roller system
JP2012208473A (en) * 2011-03-11 2012-10-25 Ricoh Co Ltd Developing device, image forming apparatus, image forming method, and process cartridge
JP2013092748A (en) 2011-10-26 2013-05-16 Cabot Corp Toner additives comprising composite particles
JP6363202B2 (en) 2013-12-20 2018-07-25 キャボット コーポレイションＣａｂｏｔ Ｃｏｒｐｏｒａｔｉｏｎ Metal oxide-polymer composite particles for chemical mechanical planarization
JP6376688B2 (en) * 2014-07-24 2018-08-22 住友ゴム工業株式会社 Semi-conductive roller

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US4076857A (en) 1976-06-28 1978-02-28 Eastman Kodak Company Process for developing electrographic images by causing electrical breakdown in the developer
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Also Published As

Publication number Publication date
AU2001261520A8 (en) 2009-07-30
EP1156373A1 (en) 2001-11-21
US20010046635A1 (en) 2001-11-29
DE60126015D1 (en) 2007-03-08
AU2001261520A1 (en) 2001-11-26
DE60126015T2 (en) 2007-07-19
EP1156391B1 (en) 2007-01-17
WO2001088617A3 (en) 2009-06-11
WO2001088617A2 (en) 2001-11-22
CA2375298C (en) 2005-07-12
AU2001261492A1 (en) 2001-11-26
EP1156391A1 (en) 2001-11-21
CA2375255A1 (en) 2001-11-22
JP2003533742A (en) 2003-11-11
US20010055723A1 (en) 2001-12-27
JP2003533740A (en) 2003-11-11
US6589703B2 (en) 2003-07-08
WO2001088620A1 (en) 2001-11-22

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