GB1398258A

GB1398258A – Electrophotography
– Google Patents

GB1398258A – Electrophotography
– Google Patents
Electrophotography

Info

Publication number
GB1398258A

GB1398258A
GB4459273A
GB4459273A
GB1398258A
GB 1398258 A
GB1398258 A
GB 1398258A
GB 4459273 A
GB4459273 A
GB 4459273A
GB 4459273 A
GB4459273 A
GB 4459273A
GB 1398258 A
GB1398258 A
GB 1398258A
Authority
GB
United Kingdom
Prior art keywords
image
methacrylate
polymer
developer
sheet
Prior art date
1972-09-22
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
GB4459273A
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.)

Eastman Kodak Co

Original Assignee
Eastman Kodak Co
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.)
1972-09-22
Filing date
1973-09-24
Publication date
1975-06-18

1973-09-24
Application filed by Eastman Kodak Co
filed
Critical
Eastman Kodak Co

1975-06-18
Publication of GB1398258A
publication
Critical
patent/GB1398258A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

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

G—PHYSICS

G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY

G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

G03G13/00—Electrographic processes using a charge pattern

G03G13/06—Developing

G03G13/10—Developing using a liquid developer, e.g. liquid suspension

Abstract

1398258 Electrographic development EASTMAN KODAK CO 24 Sept 1973 [22 Sept 1972] 44592/73 Heading G2H. A method of developing an electrostatic charge pattern carried on the surface of an electrically insulating hydrophobic substrate to provide a water-soluble dye image comprises, (A) treating the charge pattern with an electrostatic image developer consisting of a dispersion of hydrophobic polymer toner particles in a liquid having a dielectric constant less than three and a resistivity greater than 108 ohm-cm, the polymer of the toner particles having as a repeating unit thereof a group derived from an ethylenically unsaturated polymerizable monomer having attached thereto either (1) a sulphonic acid group, carboxylic acid group, the anhydride or partial alkyl ester of such groups or (2) a basic nitrogen containing group; (B) contacting the deposited toner particle pattern with an activating solution of appropriate acidity or basicity to render the toner pattern hydrophilic and (C) contacting the hydrophilic toner pattern with an aqueous dye solution to form a visible, water-soluble, dye image corresponding to the toner pattern. Steps (A) and (B) may be performed together by using a mixture of the activating and the aqueous dye solutions. Many suitable developer compositions, activating solution compositions and dyes are specified. The preparation of some of the copolymers suitable for use in the developer are described in Specification 1396154. In one Example, an electrostatic image on a photo-conductive sheet, corresponding to one colour of three colour separation positives, is developed with a liquid developer comprising finely divided poly(2-methyl-5-vinylpyridine-comethyl methacrylate-co-lauryl methacrylate) particles in an isoparaffinic hydrocarbon solvent. The polymer particle image is electrostatically transferred to a receiving sheet, comprising poly (ethylene terephthalate) bearing a thin electrically conductive hydrophobic surface layer of cellulose nitrate containing cuprous iodide, and is dyed with a combined activating (acidic) and dye solution. In a second Example, the dye images are transferred successively to a single final support sheet, each image being fused on to said sheet before subsequent transfers thereto. In a third Example, three separate photo-conductive sheet matrices carrying developed separation images are dyed with their respective colours and the dyes in the polymer images transferred sequentially and in register to a single paper transfer sheet having a gelatine overcoat containing a basic mordant. Duplicate prints can be made by re-dying the matrices and transferring the dyes to another transfer sheet. In a fourth Example, a developer comprising a mixture of two hydrophobic polymer dispersions each in an isoparaffinic hydrocarbon solvent is used, the polymers being poly(ethyl acrylate-coethyl methacrylate-lauryl methacrylate-co-sulphoethyl methacrylate) and poly(styrene-co-lauryl methacrylate-co-sulphoethyl methacrylate). Activation and dying of the polymer image is effected with a basic aqueous dye solution containing ammonia.

GB4459273A
1972-09-22
1973-09-24
Electrophotography

Expired

GB1398258A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

US29148672A

1972-09-22
1972-09-22

Publications (1)

Publication Number
Publication Date

GB1398258A
true

GB1398258A
(en)

1975-06-18

Family
ID=23120494
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB4459273A
Expired

GB1398258A
(en)

1972-09-22
1973-09-24
Electrophotography

Country Status (4)

Country
Link

US
(1)

US3776757A
(en)

JP
(1)

JPS4971940A
(en)

FR
(1)

FR2200554B1
(en)

GB
(1)

GB1398258A
(en)

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4485091A
(en)

*

1980-07-15
1984-11-27
Quinoderm Limited
Dermatological compositions

Families Citing this family (9)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4156034A
(en)

*

1974-03-20
1979-05-22
Hitachi, Ltd.
Liquid developer for electro photography

US4040828A
(en)

*

1975-01-06
1977-08-09
Xerox Corporation
Multicolor imaging method and imaged member employing combinations of transparent toner and colorant

US3974769A
(en)

*

1975-05-27
1976-08-17
International Business Machines Corporation
Method and apparatus for recording information on a recording surface through the use of mists

DE2907633A1
(en)

*

1978-02-28
1979-09-06
Canon Kk

DRY TONER FOR THE DEVELOPMENT OF CHARGE IMAGES

JPS5863937A
(en)

*

1981-10-14
1983-04-16
Toray Ind Inc
Picture film for photoengraving

GB9422162D0
(en)

*

1994-11-03
1994-12-21
Zeneca Ltd
Composition, compound and use

US5761583A
(en)

*

1996-09-25
1998-06-02
Custer; Peter
Liquid nitrogen printing process and apparatus and toner composition

JPH10260585A
(en)

*

1997-03-19
1998-09-29
Fujitsu Ltd
Method and device for image forming

US6732777B2
(en)

*

2001-05-09
2004-05-11
Hewlett-Packard Development Company, L.P.
Dispensing adhesive in a bookbinding system

1972

1972-09-22
US
US00291486A
patent/US3776757A/en
not_active
Expired – Lifetime

1973

1973-09-14
FR
FR7333024A
patent/FR2200554B1/fr
not_active
Expired

1973-09-20
JP
JP48105548A
patent/JPS4971940A/ja
active
Pending

1973-09-24
GB
GB4459273A
patent/GB1398258A/en
not_active
Expired

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4485091A
(en)

*

1980-07-15
1984-11-27
Quinoderm Limited
Dermatological compositions

Also Published As

Publication number
Publication date

FR2200554B1
(en)

1978-09-08

JPS4971940A
(en)

1974-07-11

FR2200554A1
(en)

1974-04-19

US3776757A
(en)

1973-12-04

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Legal Events

Date
Code
Title
Description

1975-10-29
PS
Patent sealed [section 19, patents act 1949]

1979-05-02
PCNP
Patent ceased through non-payment of renewal fee

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