NEGATIVELY CHARGEABLE TONER FOR ELECTROPHOTOGRAPHY

Title:

NEGATIVELY CHARGEABLE TONER FOR ELECTROPHOTOGRAPHY

Document Type and Number:

Japanese Patent JPS6095549

Kind Code:

A

Abstract:

PURPOSE: To obtain a toner for dry development undergoing little change in the chargeability due to an environmental change and preventing deterioration in the quality of an image even after repeated continuous copying by adding a specified thioindigo pigment to a binding resin.

CONSTITUTION: A negatively chargeable toner contg. an org. pigment is obtd. by adding 1W10 parts thioindigo pigment represented by general formula I or II(where R is H, CH3 or Cl) to 100 parts binding resin. The chargeability of the toner is almost independent of temp., and the toner has superior durability in repeated continuous copying. The binding resin is selected among various resins including conventional known resins, yet styrene resin is preferably used.

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Inventors:

UCHIDA MITSURU
ASAHINA YASUO
OCHIAI HIDEMI

Application Number:

JP20284483A

Publication Date:

May 28, 1985

Filing Date:

October 31, 1983

Export Citation:

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Assignee:

RICOH KK

International Classes:

G03G9/08; G03G9/09; G03G9/097; (IPC1-7): G03G9/08

Attorney, Agent or Firm:

Hidetake Komatsu

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