EP0357042A2 - Zusammensetzung und Verfahren für die Entwicklung latenter elektrostatischer Bilder - Google Patents

Zusammensetzung und Verfahren für die Entwicklung latenter elektrostatischer Bilder Download PDF

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Publication number
EP0357042A2
EP0357042A2 EP89116016A EP89116016A EP0357042A2 EP 0357042 A2 EP0357042 A2 EP 0357042A2 EP 89116016 A EP89116016 A EP 89116016A EP 89116016 A EP89116016 A EP 89116016A EP 0357042 A2 EP0357042 A2 EP 0357042A2
Authority
EP
European Patent Office
Prior art keywords
toner
carrier
developing
magnetic
composition
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
EP89116016A
Other languages
English (en)
French (fr)
Other versions
EP0357042A3 (de
EP0357042B1 (de
Inventor
Kazuo C/O Tdk Corporation Aoki
Akira C/O Tdk Corporation Kakinuma
Megumi C/O Tdk Corporation Saito
Motohiko C/O Tdk Corporation Makino
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.)
TDK Corp
Original Assignee
TDK Corp
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
Priority claimed from JP63213812A external-priority patent/JP2787687B2/ja
Priority claimed from JP1152978A external-priority patent/JP2807743B2/ja
Application filed by TDK Corp filed Critical TDK Corp
Publication of EP0357042A2 publication Critical patent/EP0357042A2/de
Publication of EP0357042A3 publication Critical patent/EP0357042A3/de
Application granted granted Critical
Publication of EP0357042B1 publication Critical patent/EP0357042B1/de
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
    • 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
    • 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
    • G03G9/0819—Developers with toner particles characterised by the dimensions of the 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
    • G03G9/083—Magnetic toner particles
    • G03G9/0831—Chemical composition of the magnetic components

Definitions

  • the carrier may have a maximum magnetization ⁇ m of 25 to 220 emu/g, preferably 30 to 210 emu/g upon magnetization at 5000 Oe.
  • ferrite carriers preferably have a maximum magnetization ⁇ m of 30 to 100 emu/g. With a maximum magnetization ⁇ m of less than 25 emu/g, carrier drag-out will often occur. If the maximum magnetization ⁇ m of the carrier is more than 220 emu/g, the resulting magnetic brush would form a hard head causing scratches on the photoconductor. It is to be noted that these magnetic properties may be measured by means of a vibration magnetometer.
  • the magnetic powder preferably has a mean particle diameter of from 0.01 to 10 ⁇ m, more preferably from 0.05 to 3 ⁇ m.
  • FIG. 1 schematically illustrates a developing unit of the magnetic brush development type.
  • the developing unit includes a developing tank 2 for receiving a developing composition 1 therein, a sleeve roll 3, and a magnetic roll 4 coaxially received in the sleeve 3 for free rotation. Relative rotation is induced between the sleeve roll 3 and the magnet roll 4 by rotating either one or both of them.
  • a blade 5 is spaced from the sleeve roll 3 to define a gap between the blade and the sleeve, serving to form a layer of the developing composition on the sleeve roll 3.
  • a photo­conductor 6, an arcuate section of which is shown in the figure, is disposed in close facing relationship to the sleeve roll 3.
  • the carrier should preferably have a mean particle diameter of 15 to 30 ⁇ m.
  • Carriers 1 and 3 and Toners A and B are the same as in Example 1.
  • Toners C and D are the same as Toners A and B except that Compositions A and B were replaced by the following Compositions C and D, respectively.
  • Composition C Magnetic powder BL-500 (Titan Industry K.K.) 55 pbw Styrene-acrylic resin (Nihon Carbide Industry K.K.) 42.5 pbw Polypropylene 550P (Sanyo Chemicals K.K.) 2.5 pbw Aizen Spilon Black TRH (Hodogaya Chemical K.K.) 1 pbw
  • Composition D Magnetic powder BL-500 (Titan Industry K.K.) 55 pbw Styrene-acrylic resin (Mitsubishi Rayon K.K.) 41 pbw Polypropylene 550P (Sanyo Chemicals K.K.) 5 pbw Bontron S-34 (Orient Chemical K.K.) 1 pbw Table 5 At

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP89116016A 1988-08-30 1989-08-30 Zusammensetzung und Verfahren für die Entwicklung latenter elektrostatischer Bilder Expired - Lifetime EP0357042B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP63213812A JP2787687B2 (ja) 1988-08-30 1988-08-30 静電潜像現像剤および現像方法
JP213812/88 1988-08-30
JP1152978A JP2807743B2 (ja) 1989-06-15 1989-06-15 静電潜像現像剤および現像方法
JP152978/89 1989-06-15

Publications (3)

Publication Number Publication Date
EP0357042A2 true EP0357042A2 (de) 1990-03-07
EP0357042A3 EP0357042A3 (de) 1991-11-06
EP0357042B1 EP0357042B1 (de) 1998-03-25

Family

ID=26481732

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116016A Expired - Lifetime EP0357042B1 (de) 1988-08-30 1989-08-30 Zusammensetzung und Verfahren für die Entwicklung latenter elektrostatischer Bilder

Country Status (6)

Country Link
EP (1) EP0357042B1 (de)
AT (1) ATE164459T1 (de)
AU (1) AU628074B2 (de)
CA (1) CA1338398C (de)
DE (1) DE68928614T2 (de)
DK (1) DK174456B1 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0452209A1 (de) * 1990-04-11 1991-10-16 Tomoegawa Paper Co. Ltd. Magnetischer Toner
EP0658821A2 (de) * 1993-11-30 1995-06-21 Konica Corporation Entwickler vom Zwei-Komponententyp und Bildherstellungsverfahren
EP0701178A1 (de) * 1994-09-02 1996-03-13 Mita Industrial Co. Ltd. Bildherstellungsverfahren
EP0703503A1 (de) * 1994-08-31 1996-03-27 Mita Industrial Co., Ltd. Toner für Zweikomponentenentwickler
EP0703506A1 (de) * 1994-09-02 1996-03-27 Mita Industrial Co. Ltd. Verfahren zur Entwicklung eines elektrostatischen, latenten Bildes
EP0703504A1 (de) * 1994-08-31 1996-03-27 Mita Industrial Co., Ltd. Toner für Zweikomponentenentwickler
EP0703505A1 (de) * 1994-08-31 1996-03-27 Mita Industrial Co., Ltd. Toner für Zweikomponentenentwickler
EP0703507A1 (de) * 1994-09-02 1996-03-27 Mita Industrial Co. Ltd. Bildherstellungsverfahren
EP0704768A1 (de) * 1994-08-31 1996-04-03 Mita Industrial Co., Ltd. Toner für Zweikomponentenentwickler
EP0704767A1 (de) * 1994-08-31 1996-04-03 Mita Industrial Co., Ltd. Entwickler des Zweikomponententyps
EP0813118A2 (de) * 1996-06-10 1997-12-17 Mita Industrial Co. Ltd. Toner für Zweikomponentenentwickler

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2074745A (en) * 1980-04-09 1981-11-04 Ricoh Kk Developer for developing latent electostatic images
DE3140639A1 (de) * 1980-10-13 1982-06-16 Ricoh Co., Ltd., Tokyo Elektrophotographisches verfahren
EP0125606A1 (de) * 1983-05-11 1984-11-21 Mita Industrial Co. Ltd. Vorrichtung zur Feststellung des günstigen Zustandes eines Entwicklers in einer Kopiermaschine
US4675268A (en) * 1981-11-26 1987-06-23 Konishiroku Photo Industry Co., Ltd. Process for transfer of a toner image utilizing a magnetic toner containing a binder resin and having gradual softening characteristics
JPS63276065A (ja) * 1987-05-07 1988-11-14 Casio Electronics Mfg Co Ltd 現像剤

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5785060A (en) * 1980-11-17 1982-05-27 Mita Ind Co Ltd Composite developer
US4414321A (en) * 1980-11-27 1983-11-08 Mita Industrial Co. Ltd. Dry composite blended magnetic developer of resin encapsulated fine magnetite and resin encapsulated coarse magnetite
JPS57124356A (en) * 1981-01-26 1982-08-03 Mita Ind Co Ltd Binary magnetic developer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2074745A (en) * 1980-04-09 1981-11-04 Ricoh Kk Developer for developing latent electostatic images
DE3140639A1 (de) * 1980-10-13 1982-06-16 Ricoh Co., Ltd., Tokyo Elektrophotographisches verfahren
US4675268A (en) * 1981-11-26 1987-06-23 Konishiroku Photo Industry Co., Ltd. Process for transfer of a toner image utilizing a magnetic toner containing a binder resin and having gradual softening characteristics
EP0125606A1 (de) * 1983-05-11 1984-11-21 Mita Industrial Co. Ltd. Vorrichtung zur Feststellung des günstigen Zustandes eines Entwicklers in einer Kopiermaschine
JPS63276065A (ja) * 1987-05-07 1988-11-14 Casio Electronics Mfg Co Ltd 現像剤

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 13, no. 93 (P-838)[3441], 6th March 1989; & JP-A-63 276 065 (CASIO ELECTRONICS MFG CO., LTD) 14-11-1988 *

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5561018A (en) * 1990-04-11 1996-10-01 Tomoegawa Paper Co., Ltd. Magnetic toner
EP0452209A1 (de) * 1990-04-11 1991-10-16 Tomoegawa Paper Co. Ltd. Magnetischer Toner
EP0658821A2 (de) * 1993-11-30 1995-06-21 Konica Corporation Entwickler vom Zwei-Komponententyp und Bildherstellungsverfahren
EP0658821A3 (de) * 1993-11-30 1995-12-06 Konishiroku Photo Ind Entwickler vom Zwei-Komponententyp und Bildherstellungsverfahren.
US5576134A (en) * 1993-11-30 1996-11-19 Konica Corporation Two-component type developer and image forming process
EP0703503A1 (de) * 1994-08-31 1996-03-27 Mita Industrial Co., Ltd. Toner für Zweikomponentenentwickler
EP0703504A1 (de) * 1994-08-31 1996-03-27 Mita Industrial Co., Ltd. Toner für Zweikomponentenentwickler
EP0703505A1 (de) * 1994-08-31 1996-03-27 Mita Industrial Co., Ltd. Toner für Zweikomponentenentwickler
EP0704768A1 (de) * 1994-08-31 1996-04-03 Mita Industrial Co., Ltd. Toner für Zweikomponentenentwickler
EP0704767A1 (de) * 1994-08-31 1996-04-03 Mita Industrial Co., Ltd. Entwickler des Zweikomponententyps
US5580691A (en) * 1994-08-31 1996-12-03 Mita Industrial Co., Ltd. Toner for a two-component type developer
US5750301A (en) * 1994-08-31 1998-05-12 Mita Industrial Co., Ltd. Toner for a two-component type developer
EP0703507A1 (de) * 1994-09-02 1996-03-27 Mita Industrial Co. Ltd. Bildherstellungsverfahren
EP0703506A1 (de) * 1994-09-02 1996-03-27 Mita Industrial Co. Ltd. Verfahren zur Entwicklung eines elektrostatischen, latenten Bildes
EP0701178A1 (de) * 1994-09-02 1996-03-13 Mita Industrial Co. Ltd. Bildherstellungsverfahren
EP0813118A2 (de) * 1996-06-10 1997-12-17 Mita Industrial Co. Ltd. Toner für Zweikomponentenentwickler
EP0813118A3 (de) * 1996-06-10 1998-01-07 Mita Industrial Co. Ltd. Toner für Zweikomponentenentwickler

Also Published As

Publication number Publication date
DK428689A (da) 1990-03-01
AU628074B2 (en) 1992-09-10
EP0357042A3 (de) 1991-11-06
DK174456B1 (da) 2003-03-24
DE68928614T2 (de) 1998-10-22
DE68928614D1 (de) 1998-04-30
AU4087289A (en) 1990-03-08
DK428689D0 (da) 1989-08-30
ATE164459T1 (de) 1998-04-15
CA1338398C (en) 1996-06-18
EP0357042B1 (de) 1998-03-25

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