§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US3640709A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrophotographic copying material and process of producing thereof

Assignee: Toagosei Co Ltd
•
Filing: 1968-12-23
•
Granted: 1972-02-08
•
Expires: 1988-12-23
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract An electrophotographic copying material comprising a support and a light-sensitive or photoconductive layer formed on one surface of said support and comprising a resinous binder. The photoconductive layer contains a photoconductive substance and is formed by dispersing said photoconductive substance in a wateremulsified resinous binder. The resinous binder is prepared by emulsion polymerization, in water, of at least one vinyl monomer in the presence of at least one acidic compound selected from the group consisting of an aliphatic carboxylic acid, an aromatic carboxylic acid, an acid anhydride of said carboxylic acids, an alicyclic compound having a carboxyl radical, a natural resin containing a resin acid and having a high electric resistance and a vinyl polymer having a carboxyl radical. The resultant photoconductive layer-forming solution is coated on said support and then the coated support is dried.

Inventors

  • 👤 Kishichiro Kondo
  • 👤 Hiroo Iwata
  • 👤 Nario Yamaguchi
  • 👤 Sakae Shimizu
  • 👤 Kazuo Tubuko

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 15:27
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0596; G03G5/0503; G03G5/051; G03G5/0514; G03G5/0517; G03G5/0521; G03G5/0532; Y; Y10; Y10S; Y10S526/00; Y10S526/934

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 36 words
at least one monomer selected from the group consisting of vinyl propionate, vinylidene chloride, crotonic acid, maleic acid and its anhydride, vinyl stearate, vinyl isobutylether, vinyl alcohol, methacrylic acid, butadiene, dimethyl itaconate, acrylic acid and acylonitrile,
Claim 2
Dependent Claim 47 words
A process according to claim 1, wherein said vinyl polymers having carboxyl radical are copolymers prepared by polymerizing at least one vinyl monomer and at least one unsaturated carboxylic acid selected from the group consisting of aliphatic unsaturated monocarboxylic acids and monoesters of aliphatic unsaturated dicarboxylic acids.
Claim 3
Dependent Claim 59 words
A process according to claim 1, wherein said natural resins having resin acid are selected from the group consisting of elemi, gurjun balsam, jalap, scammonia, amber, bdellium, sagapenum, euphorbium, myrrh, opopanax, shellac, acaroid, dragon brad, mustic, styrax, canada balsam, becca balsam, copaiba balsam, peru balsam, guaiac, tacamahac, galvanum, gamboge, olibanum, ammoniac, asfetida, copals, sandarack, true balsam and kawakawa resin.
Claim 4
Dependent Claim 94 words
at least oNe acidic compound selected from the group consisting of aliphatic carboxylic acids, aromatic carboxylic acids, acid anhydrides of said carboxylic acids, alicyclic compounds having a carboxyl radical, natural resins having resin acid and an electric resistance of at least 1011 Omega cm. and vinyl polymers having carboxyl radical and an electric resistance of at least 10 11 Omega cm., the amount of said acidic compound contained in said reaction mixture being in the range of from about 0.01 to 0.1 part by weight per 1 part by weight of said monomers, and
Claim 5
Dependent Claim 97 words
a surface-active agent selected from the group consisting of alkylbenzene sulfonic acid-triethanolamine salt, sodium benzene sulfonate, sodium lauryl sulfate, dialkylsulfosuccinate and sodium dodecylbenzenesulfonate, the amount of said surface-active agent being in the range of from 0.05 to 0.1 percent by weight of the total amount of the monomers contained in said reaction mixture; dispersing an inorganic photoconductive substance into the reaction product of said emulsion polymerization and consisting of said water-emulsified resinous binder; coating the resultant dispersion onto one surface of a support; and then drying the coated dispersion thereby forming a photoconductive layer on said support.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-02-07 1975-08-09 1976-02-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-02-07 1979-08-09 1980-02-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-02-07 1983-08-09 1984-02-08 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag