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US3717461A Expired / Lapsed US ⏱️ 0.0 years remaining

Removal of protective resin layer by liquid developer in electrophotographic imaging

Assignee: Fujifilm Holdings Corp
•
Filing: 1971-02-12
•
Granted: 1973-02-20
•
Expires: 1991-02-12
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Abstract

Abstract Such susceptibility is reduced REMOVAL OF PROTECTIVE RESIN LAYER BY LIQUID DEVELOPER IN ELECTROPHOTOGRAPHIC IMAGING forming overlying the photoconductive coating a protective top coating which can be removed by dissolving away into an insulating liquid prior to or during liquid development. An electrophotographic process wherein an electrostatic latent image is formed on an electrophotographic member, the member comprising a flexible support bearing thereon a photoconductive insulative layer insoluble or only sparingly soluble in a non-polar, electrically insulating liquid. Disposed on the photoconductive insulative layer is an insulative protective layer consisting mainly of a non-polar resin. The protective layer may be dissolved with the non-polar electrically insulating liquid either prior to or during the development of the latent image with the non-polar electrically insulating liquid. If the protective layer is dissolved during the development step, the carrier liquid of the liquid developer is the non-polar, electrically insulating liquid. An electrophotographic coating is generally susceptible to mechanical damage in the course of manufacture storage and processing. Such susceptibility is reduced by forming overlying the photoconductive coating a protective top coating which can be removed by dissolving away into an insulating liquid prior to or during liquid development.

Inventors

  • 👤 S Honjo

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 22:17
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/22; G03G5/00; G03G5/14; G03G5/147; G03G5/14708; G03G5/14713; G03G5/14717; G03G5/14734; G03G5/14743; G03G5/14747; G03G5/14752; G03G5/1476; G03G9/00; G03G9/08; G03G9/12

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 83 words
An electrophotographic process which comprises forming an electrostatic latent image on an electrophotographic sensitive Member comprising a flexible support bearing thereon a photoconductive insulating layer insoluble or only sparingly soluble in a non-polar treatment bath and further thereon an insulative protective layer consisting mainly of a non-polar resin, and dissolving said protective layer with said treatment bath; and developing said latent image with a liquid developer which comprises an electrically insulating carrier liquid and an electrically charged toner dispersed in said carrier liquid.
Claim 2
Dependent Claim 83 words
An electrophotographic process which comprises forming an electrostatic latent image on an electrophotographic sensitive Member comprising a flexible support bearing thereon a photoconductive insulating layer insoluble or only sparingly soluble in a non-polar treatment bath and further thereon an insulative protective layer consisting mainly of a non-polar resin, and dissolving said protective layer with said treatment bath; and developing said latent image with a liquid developer which comprises an electrically insulating carrier liquid and an electrically charged toner dispersed in said carrier liquid.
Claim 3
Dependent Claim 64 words
An electrophotographic process as claimed in claim 1, wherein said insulative protective layer consisting mainly of styrene-modified alkyd resin, non-drying oil-modified alkyd resin, long oil type epoxyester resin, polybutyl methacrylate, homopolymers of alkyl ester of acrylic acid or methacrylic acid containing more than 5 carbon atoms in its alkyl group and copolymer mainly consisting of said ester, styrene-butylmethacrylate copolymer, styrene-butadiene copolymer or silicone resin.
Claim 4
Dependent Claim 20 words
An electrophotographic process as claimed in claim 1 wherein said insulative protective layer is 0.2 - 5 Mu in thickness.
Claim 5
Dependent Claim 86 words
An electrophotographic process which comprises forming an electrostatic latent image on an electrophotographic sensitive member comprising a flexible support bearing thereon a photoconductive insulative layer insoluble or only sparingly soluble in a non-polar, electrically insulating carrier liquid and further thereon an insulative protective layer consisting mainly of a non-polar resin, and dissolving said protective layer during the step of development of said latent image with a liquid developer which comprises said non-polar, electrically insulating carrier liquid and an electrically charged toner dispersed in said carrier liquid.
Claim 6
Dependent Claim 86 words
An electrophotographic process which comprises forming an electrostatic latent image on an electrophotographic sensitive member comprising a flexible support bearing thereon a photoconductive insulative layer insoluble or only sparingly soluble in a non-polar, electrically insulating carrier liquid and further thereon an insulative protective layer consisting mainly of a non-polar resin, and dissolving said protective layer during the step of development of said latent image with a liquid developer which comprises said non-polar, electrically insulating carrier liquid and an electrically charged toner dispersed in said carrier liquid.
Claim 7
Dependent Claim 69 words
An electrophotographic process as claimed in claim 4, wherein said insulative protective layer is selected from the group consisting mainly of styrene-modified alkyd resin, non-drying oil-modified alkyd resin, long oil type epoxyester resin, polybutyl methacrylate, homopolymers of alkyl ester of acrylic acid or methacrylic acid containing more than 5 carbon atoms in its alkyl group and copolymer mainly consisting of said ester, styrene-butylmethacrylate copolymer, styrene-butadiene copolymer and silicone resin.

References Cited (Backward Citations)

US2907674A Cited
US3102026A Cited
US3192043A Cited
US3120446A Cited
US3251688A Cited
US3372027A Cited
US3434832A Cited
US3551313A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-02-20 1976-08-21 1977-02-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-02-20 1980-08-21 1981-02-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-02-20 1984-08-21 1985-02-20 $7700.00 Window Closed / Lapsed

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