JPS5555347A - Liquid developer for electrophotography - Google Patents

Liquid developer for electrophotography

Info

Publication number
JPS5555347A
JPS5555347A JP12934478A JP12934478A JPS5555347A JP S5555347 A JPS5555347 A JP S5555347A JP 12934478 A JP12934478 A JP 12934478A JP 12934478 A JP12934478 A JP 12934478A JP S5555347 A JPS5555347 A JP S5555347A
Authority
JP
Japan
Prior art keywords
pigments
toner
hydroxides
metals
dispersed
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
JP12934478A
Other languages
Japanese (ja)
Other versions
JPS585427B2 (en
Inventor
Taro Kimura
Tsuneo Kurotori
Junichiro Hashimoto
Kazuo Tsubushi
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 JP12934478A priority Critical patent/JPS585427B2/en
Publication of JPS5555347A publication Critical patent/JPS5555347A/en
Publication of JPS585427B2 publication Critical patent/JPS585427B2/en
Expired legal-status Critical Current

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  • Liquid Developers In Electrophotography (AREA)

Abstract

PURPOSE: To improve the dispersion stability of the toner and improve developing characteristic and durability by using the carbon black or organic pigments covered with metal oxides on the coloring agent main components of the toner.
CONSTITUTION: Carbon black or organic pigments are dispersed in an aqueous solution of sulfates, hydroxides, etc. of metals and are made neutral or weak alkaline, whereby the soft core cellulated layers of hydroxides or hydrates of metals are formed around pigment particles. Next, these are gradually dried and solidified at 100W200°C, whereby the metal oxide coated pigments are obtained. These coated pigments are dispersed in an organic solvent (petroleum base aliphatic hydrocarbon, etc.) of high electric resistance and low dielectric factor to obtain the liquid developer. The coated pigments obtained in this way have good dispersibility and high resistance, prevent fining of the toner and become suited to provide the images of high density. The thickness of the oxide layer is suitably about 0.1W0.05μ and the amount is about 0.1W5wt% based on the weight of the pigments.
COPYRIGHT: (C)1980,JPO&Japio
JP12934478A 1978-10-20 1978-10-20 Liquid developer for electrophotography Expired JPS585427B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12934478A JPS585427B2 (en) 1978-10-20 1978-10-20 Liquid developer for electrophotography

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12934478A JPS585427B2 (en) 1978-10-20 1978-10-20 Liquid developer for electrophotography

Publications (2)

Publication Number Publication Date
JPS5555347A true JPS5555347A (en) 1980-04-23
JPS585427B2 JPS585427B2 (en) 1983-01-31

Family

ID=15007281

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12934478A Expired JPS585427B2 (en) 1978-10-20 1978-10-20 Liquid developer for electrophotography

Country Status (1)

Country Link
JP (1) JPS585427B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01156763A (en) * 1987-11-25 1989-06-20 E I Du Pont De Nemours & Co Improved liquid electrostatic developer having scratch resistance of image
JPH01257860A (en) * 1988-04-07 1989-10-13 Sony Corp Liquid developer for developing electrostatic latent image

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01156763A (en) * 1987-11-25 1989-06-20 E I Du Pont De Nemours & Co Improved liquid electrostatic developer having scratch resistance of image
JPH01257860A (en) * 1988-04-07 1989-10-13 Sony Corp Liquid developer for developing electrostatic latent image

Also Published As

Publication number Publication date
JPS585427B2 (en) 1983-01-31

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