JPS642065A - Liquid color developer for electrostatic photography - Google Patents

Liquid color developer for electrostatic photography

Info

Publication number
JPS642065A
JPS642065A JP15660687A JP15660687A JPS642065A JP S642065 A JPS642065 A JP S642065A JP 15660687 A JP15660687 A JP 15660687A JP 15660687 A JP15660687 A JP 15660687A JP S642065 A JPS642065 A JP S642065A
Authority
JP
Japan
Prior art keywords
liquid
electrostatic photography
color developer
naphthol
enhanced
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
JP15660687A
Other languages
Japanese (ja)
Other versions
JPH012065A (en
Inventor
Akihiko Goto
Naoyasu Katsumata
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 JP15660687A priority Critical patent/JPS642065A/en
Publication of JPH012065A publication Critical patent/JPH012065A/en
Publication of JPS642065A publication Critical patent/JPS642065A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/12—Developers with toner particles in liquid developer mixtures
    • G03G9/122—Developers with toner particles in liquid developer mixtures characterised by the colouring agents

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Liquid Developers In Electrophotography (AREA)

Abstract

PURPOSE:To eliminate background fog and to obtain high image density by using a naphthol AS type insoluble azo pigment specified in composition. CONSTITUTION:The liquid color developer for electrostatic photography is obtained by dispersing into a liquid medium a toner composed essentially of a binder resin and the naphthol AS type insoluble azo pigment represented by formula I in which R is H or a group of formula II; each of A, B, and C is groups of formulae III, and each of X and Y is groups of formulae IV, thus permitting the characters printed by using this liquid developer to be freed of background fog and enhanced in image density, and accordingly, color images formed by color superimposing development to be enhanced in contrast.
JP15660687A 1987-06-25 1987-06-25 Liquid color developer for electrostatic photography Pending JPS642065A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15660687A JPS642065A (en) 1987-06-25 1987-06-25 Liquid color developer for electrostatic photography

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15660687A JPS642065A (en) 1987-06-25 1987-06-25 Liquid color developer for electrostatic photography

Publications (2)

Publication Number Publication Date
JPH012065A JPH012065A (en) 1989-01-06
JPS642065A true JPS642065A (en) 1989-01-06

Family

ID=15631414

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15660687A Pending JPS642065A (en) 1987-06-25 1987-06-25 Liquid color developer for electrostatic photography

Country Status (1)

Country Link
JP (1) JPS642065A (en)

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