§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4985330A Expired / Lapsed US ⏱️ 0.0 years remaining

Photosensitive material for electrophotography and method for making same

Assignee: Panasonic Holdings Corp
•
Filing: 1989-11-07
•
Granted: 1991-01-15
•
Expires: 2009-11-07
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A photosensitive material for electrophotography which comprises an electrically conductive support of a desired shape and an organic photoconductive layer formed on the substrate, is provided. The organic photoconductive layer is formed from a solution of an organic charge-generating compound, an organic charge transfer compound and an organic resin in an organic solvent after low temperature treatment thereof wherein the solution is cooled to a temperature sufficient not to cause the solutes to be precipitated or the solution to be coagulated for a time enough to allow interaction between the compounds and the resin binder and is returned to room temperature. This solution is applied to the support and dried to form a photoconductive layer on the support. The photoconductive layer may be of a single-layer structure or a double-layered structure wherein at least one sub-layer should be formed from a solution subjected to the low temperature treatment. A process for making the photosensitive material is also described.

Inventors

  • 👤 Sohji Tsuchiya
  • 👤 Mutsuaki Murakami
  • 👤 Susumu Yoshimura

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 22:11
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0525; G03G5/043; G03G5/047

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 132 words
A process for forming a photosensitive material for electrophotography which comprises: preparing a solution of a charge-generating compound and/or a charge transfer compound and a resin binder in an organic solvent wherein the charge-generating compound and/or charge transfer compound, the resin binder and the organic solvent have, respectively, a ring structure in the molecule; subjecting the solution to low temperature treatment wherein said solution is cooled from normal temperatures to a temperature which does not cause the solutes to be precipitated or the solution to be coagulated, for a time enough to allow interaction between the compound or compounds and the binder and is gradually returned to normal temperatures; applying the thus treated solution onto an electrically conductive support; and drying the applied solution to form a photoconductive layer on the support.
Claim 2
Dependent Claim 132 words
A process for forming a photosensitive material for electrophotography which comprises: preparing a solution of a charge-generating compound and/or a charge transfer compound and a resin binder in an organic solvent wherein the charge-generating compound and/or charge transfer compound, the resin binder and the organic solvent have, respectively, a ring structure in the molecule; subjecting the solution to low temperature treatment wherein said solution is cooled from normal temperatures to a temperature which does not cause the solutes to be precipitated or the solution to be coagulated, for a time enough to allow interaction between the compound or compounds and the binder and is gradually returned to normal temperatures; applying the thus treated solution onto an electrically conductive support; and drying the applied solution to form a photoconductive layer on the support.
Claim 3
Dependent Claim 17 words
The process according to claim 1, wherein said solution contains both charge-generating compound and charge transfer compound.
Claim 4
Dependent Claim 43 words
The process according to claim 1, wherein said solution contains either the charge-generating compound or charge transfer compound, and the compound which is not contained in the solution is dissolved in an organic solvent and is applied without undergoing the low temperature treatment.
Claim 5
Dependent Claim 20 words
The process according to claim 1, wherein the temperature is in the range of from -15° C. to -40° C.
Claim 6
Dependent Claim 24 words
The process according to claim 1, wherein the cooled solution is returned to normal temperatures at a rate of from 1° to 10° C./minute.
Claim 7
Dependent Claim 16 words
The process according to claim 1, wherein the low temperature treatment procedure is repeated several times.
Claim 8
Dependent Claim 24 words
The process according to claim 1, wherein said binder consists essentially of a curable resin and, after the application, the curable resin is cured.

References Cited (Backward Citations)

JPS50137738A Cited
JPS61149962A Cited
JPS63202753A Cited
JPH01116553A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1994-01-14 1994-07-16 1995-01-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1998-01-14 1998-07-16 1999-01-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2002-01-14 2002-07-16 2003-01-15 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag