GB1370526A - Controlling liquid electrophotgraphic developers - Google Patents

Controlling liquid electrophotgraphic developers

Info

Publication number
GB1370526A
GB1370526A GB1375272A GB1375272A GB1370526A GB 1370526 A GB1370526 A GB 1370526A GB 1375272 A GB1375272 A GB 1375272A GB 1375272 A GB1375272 A GB 1375272A GB 1370526 A GB1370526 A GB 1370526A
Authority
GB
United Kingdom
Prior art keywords
developer
development
liquid
resin
paste
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.)
Expired
Application number
GB1375272A
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.)
Australia Department of Supply
Original Assignee
Australia Department of Supply
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 Australia Department of Supply filed Critical Australia Department of Supply
Publication of GB1370526A publication Critical patent/GB1370526A/en
Expired 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B63/00—Lakes
    • 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
    • G03G9/13—Developers with toner particles in liquid developer mixtures characterised by polymer components
    • G03G9/132—Developers with toner particles in liquid developer mixtures characterised by polymer components obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • G03G9/135—Developers with toner particles in liquid developer mixtures characterised by stabiliser or charge-controlling agents

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Liquid Developers In Electrophotography (AREA)

Abstract

1370526 Development of electrostatic latent images AUSTRALIA DEPARTMENT OF SUPPLY SECRETARY OF 23 March 1972 [25 March 1971] 13752/72 Heading G2H A liquid developer for electro-photographic images, of the kind comprising a dispersion of toner particles in a liquid carrier, is so constituted as to be neutral between positive and negative working, and to be turnable towards either of these by addition of an appropriate control agent. The developer comprises a paste of toner particles, such as carbon black, a metalorganic pigment, an inor or an organic pigment, with a resin coating insoluble in the liquid carrier, and is suspended in a carrier liquid with a resistivity in excess of 10<SP>10</SP>ohm. centimetre and a dielectric constant less than three. The carrier liquid may be a hydrocarbon, and the paste may include white spirit, methylene chloride, methyl ethyl ketone or dodecanol. A positive pigment, such as carbon black or copper phthalocyanine blue, may be milled with a strongly negative resin such as pentacrythritol resin or ethylhydroxy ethyl cellulose to produce the paste. Conversion of the neutral developer to positive development of a negatively charged image is brought about by addition of a material which wets the coated toner particles and dissolves in the carrier liquid. This material may be oleic acid, napthenic acid, zirconiumoctoate, an alkyd resin or a chlorinated diphenyl. Alternatively negative development may be brought about by addition of an organic oil. After one of these materials has been applied as a control agent to effect development, the developer may be returned to neutrality, or even the opposite sign. A developed image may be continuously scanned. For example in colour development, and the developer modified automatically to correct the density of the image. Preferably the developer is used with a zinc oxide paper, comprising particles of photo-conductive zinc oxide in a film of insulating alkyd resin, bearing a negative charge image, but the zinc oxide may be replaced by selenium or a member of the sulphur group.
GB1375272A 1971-03-25 1972-03-23 Controlling liquid electrophotgraphic developers Expired GB1370526A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU442471 1971-03-25

Publications (1)

Publication Number Publication Date
GB1370526A true GB1370526A (en) 1974-10-16

Family

ID=3694877

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1375272A Expired GB1370526A (en) 1971-03-25 1972-03-23 Controlling liquid electrophotgraphic developers

Country Status (8)

Country Link
BE (1) BE781251A (en)
CA (1) CA981966A (en)
DE (1) DE2214355A1 (en)
FR (1) FR2131647A5 (en)
GB (1) GB1370526A (en)
IT (1) IT954538B (en)
NL (1) NL7204006A (en)
SE (1) SE379867B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9921511B2 (en) 2014-04-28 2018-03-20 Hewlett-Packard Development Company, L.P. Polymer-encapsulated metallic ink particles and metallic electrophotographic inks

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9921511B2 (en) 2014-04-28 2018-03-20 Hewlett-Packard Development Company, L.P. Polymer-encapsulated metallic ink particles and metallic electrophotographic inks

Also Published As

Publication number Publication date
CA981966A (en) 1976-01-20
SE379867B (en) 1975-10-20
NL7204006A (en) 1972-09-27
FR2131647A5 (en) 1972-11-10
IT954538B (en) 1973-09-15
DE2214355A1 (en) 1972-10-05
BE781251A (en) 1972-09-25

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee