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JPS5478136A - Carrier material for electrostatic photographic developer - Google Patents

Carrier material for electrostatic photographic developer

Info

Publication number
JPS5478136A
JPS5478136A JP14510977A JP14510977A JPS5478136A JP S5478136 A JPS5478136 A JP S5478136A JP 14510977 A JP14510977 A JP 14510977A JP 14510977 A JP14510977 A JP 14510977A JP S5478136 A JPS5478136 A JP S5478136A
Authority
JP
Japan
Prior art keywords
materials
glass layer
suspension
inorganic glass
covering
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
JP14510977A
Other languages
Japanese (ja)
Inventor
Mitsuru Uchida
Junji Kurokawa
Katsuji Maruyama
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP14510977A priority Critical patent/JPS5478136A/en
Publication of JPS5478136A publication Critical patent/JPS5478136A/en
Pending legal-status Critical Current

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  • Developing Agents For Electrophotography (AREA)

Abstract

PURPOSE: To reduce the accumulation of toner films on carrier particle surfaces and enhance durability by covering the core material surfaces with an inorganic glass layer.
CONSTITUTION: After glass raw materials having been blended to a desired composition are melted, the melt is quenched and is ground to about 200 mesh by a ball mill. This is then made to a suspension together with additives. This suspension is sprayed over a circulating fluidized bed by a spray gun or the like and is thereby sprayed onto the surfaces of the core materials of preferably 100 to 500μ in mean particle size whose surfaces have beforehand been degreased with a halogenated hycrocarbon base solvent. After it has been dried, it is baked in a high temperature furnace. Thereby, stable and desired triboelectrification characteristics are imparted and either positive or negative charging characteristics may be selected as desired by selecting the materials of the covering material. Suitable coverage of the inorganic glass layer is 0.1 to 1.5 wt.%.
COPYRIGHT: (C)1979,JPO&Japio
JP14510977A 1977-12-05 1977-12-05 Carrier material for electrostatic photographic developer Pending JPS5478136A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14510977A JPS5478136A (en) 1977-12-05 1977-12-05 Carrier material for electrostatic photographic developer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14510977A JPS5478136A (en) 1977-12-05 1977-12-05 Carrier material for electrostatic photographic developer

Publications (1)

Publication Number Publication Date
JPS5478136A true JPS5478136A (en) 1979-06-22

Family

ID=15377579

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14510977A Pending JPS5478136A (en) 1977-12-05 1977-12-05 Carrier material for electrostatic photographic developer

Country Status (1)

Country Link
JP (1) JPS5478136A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02131250A (en) * 1988-11-11 1990-05-21 Minolta Camera Co Ltd Developing agent

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02131250A (en) * 1988-11-11 1990-05-21 Minolta Camera Co Ltd Developing agent

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