JPS5479634A - Covered carrier - Google Patents

Covered carrier

Info

Publication number
JPS5479634A
JPS5479634A JP14685977A JP14685977A JPS5479634A JP S5479634 A JPS5479634 A JP S5479634A JP 14685977 A JP14685977 A JP 14685977A JP 14685977 A JP14685977 A JP 14685977A JP S5479634 A JPS5479634 A JP S5479634A
Authority
JP
Japan
Prior art keywords
carrier
added
charging
covering
mixture
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
JP14685977A
Other languages
Japanese (ja)
Inventor
Toshiaki Narisawa
Seiji Okada
Hirofumi Okuyama
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP14685977A priority Critical patent/JPS5479634A/en
Publication of JPS5479634A publication Critical patent/JPS5479634A/en
Pending legal-status Critical Current

Links

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  • Developing Agents For Electrophotography (AREA)

Abstract

PURPOSE: To enable sufficient charging to be applied to the toner which does not use any charging agent containing Cr and toner cohesion on surface to be reduced by adding Nigrosine base dyes and covering the carrier with an epoxy resin charging strongly to positive.
CONSTITUTION: An epoxy hardener is added at 5 to 50wt% to an epoxy oligomer of 400 to 4000 in molecular weight and Nigrosine base dyes are added 0.5 to 10wt% thereto. The mixture is then dissolved in a suitable solvent. A carrier such as oxide surface treated iron powder or the like is added into this solution, which is then thoroughly stirred. The mixture is dried by a roatry dry method of strring the solution while allowing the solvent to evaporate, by which the carrier having the covering of thicknesses 0,05 to 2μm may be obtained.
COPYRIGHT: (C)1979,JPO&Japio
JP14685977A 1977-12-07 1977-12-07 Covered carrier Pending JPS5479634A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14685977A JPS5479634A (en) 1977-12-07 1977-12-07 Covered carrier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14685977A JPS5479634A (en) 1977-12-07 1977-12-07 Covered carrier

Publications (1)

Publication Number Publication Date
JPS5479634A true JPS5479634A (en) 1979-06-25

Family

ID=15417166

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14685977A Pending JPS5479634A (en) 1977-12-07 1977-12-07 Covered carrier

Country Status (1)

Country Link
JP (1) JPS5479634A (en)

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