JPS5657041A - Magnetic toner for electrostatic transfer type copying machine - Google Patents

Magnetic toner for electrostatic transfer type copying machine

Info

Publication number
JPS5657041A
JPS5657041A JP13291479A JP13291479A JPS5657041A JP S5657041 A JPS5657041 A JP S5657041A JP 13291479 A JP13291479 A JP 13291479A JP 13291479 A JP13291479 A JP 13291479A JP S5657041 A JPS5657041 A JP S5657041A
Authority
JP
Japan
Prior art keywords
sheets
parts
powder
toner
sheet
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.)
Pending
Application number
JP13291479A
Other languages
Japanese (ja)
Inventor
Rikuo Kashiwagi
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.)
Toray Industries Inc
Original Assignee
Toray Industries Inc
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 Toray Industries Inc filed Critical Toray Industries Inc
Priority to JP13291479A priority Critical patent/JPS5657041A/en
Publication of JPS5657041A publication Critical patent/JPS5657041A/en
Pending legal-status Critical Current

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  • Developing Agents For Electrophotography (AREA)

Abstract

PURPOSE: To make the toner difficult to receive the effects of the kinds of paper and the moisture in the atmosphere and obtain stable copied image quality by using the powder comprising the two parts which are different resin powders of more than the specific value in resistivity containing magnetic materials and are charged to mutually opposite polarities, as the toner.
CONSTITUTION: The material consisting in mixing powder of ferromagnetic powder material in a resin soln. is developed and a solvent is evaporated to make a thin sheetlike material of about 10μ thickness. The material consisting in mixing ferromagnetic material powder in a resin soln. to become other part is developed on this sheet and a solvent is evaporated to form a sheet of about 10μ, whereby the double sheets are obtained. These double sheets are heated to the temperature at which the respective layers soften, and the sheets are cooled while a magnetic field of a perpendicular direction is being applied to the sheet surfaces. Next, the magnetism of the two-layer sheets is erased, after which the sheets are ground and after heat treatment, the ground particles are clasified, whereby the magnetic toner 1 which comprises two parts 2, 3, and in which the parts 2, 3 are oppositively charged so that the magnetic field direct to one direction is obtained. The resins of ≥1017Ω.cm resistivities are used for the resins of the parts 2, 3 respectively.
COPYRIGHT: (C)1981,JPO&Japio
JP13291479A 1979-10-17 1979-10-17 Magnetic toner for electrostatic transfer type copying machine Pending JPS5657041A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13291479A JPS5657041A (en) 1979-10-17 1979-10-17 Magnetic toner for electrostatic transfer type copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13291479A JPS5657041A (en) 1979-10-17 1979-10-17 Magnetic toner for electrostatic transfer type copying machine

Publications (1)

Publication Number Publication Date
JPS5657041A true JPS5657041A (en) 1981-05-19

Family

ID=15092465

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13291479A Pending JPS5657041A (en) 1979-10-17 1979-10-17 Magnetic toner for electrostatic transfer type copying machine

Country Status (1)

Country Link
JP (1) JPS5657041A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57207260A (en) * 1981-06-16 1982-12-18 Matsushita Electric Ind Co Ltd Self-chargeable toner

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5298530A (en) * 1976-02-16 1977-08-18 Hitachi Metals Ltd Magnetic toner
JPS534549A (en) * 1976-07-02 1978-01-17 Konishiroku Photo Ind Co Ltd Magnetic toner
JPS539125A (en) * 1976-07-13 1978-01-27 Ricoh Co Ltd Dry type devloping powder and its manufacture
JPS53118054A (en) * 1977-03-09 1978-10-16 Hitachi Metals Ltd Magnetic toner
JPS5647048A (en) * 1979-09-26 1981-04-28 Toray Ind Inc Magnetic toner for electrostatic transfer type copying machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5298530A (en) * 1976-02-16 1977-08-18 Hitachi Metals Ltd Magnetic toner
JPS534549A (en) * 1976-07-02 1978-01-17 Konishiroku Photo Ind Co Ltd Magnetic toner
JPS539125A (en) * 1976-07-13 1978-01-27 Ricoh Co Ltd Dry type devloping powder and its manufacture
JPS53118054A (en) * 1977-03-09 1978-10-16 Hitachi Metals Ltd Magnetic toner
JPS5647048A (en) * 1979-09-26 1981-04-28 Toray Ind Inc Magnetic toner for electrostatic transfer type copying machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57207260A (en) * 1981-06-16 1982-12-18 Matsushita Electric Ind Co Ltd Self-chargeable toner

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