US4489147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic photoconductive elements employing a polycarbonate resin
Assignee: Pitney Bowes Inc
•
Filing: 1981-12-16
•
Granted: 1984-12-18
•
Expires: 2001-12-16
Abstract
Abstract Organic photoconductive elements with a charge generating layer and a charge transport layer carried on an electroconductive support are disclosed. The invention involves the combined use of a polycarbonate resin having a weight average molecular weight ranging from about 25,000 to about 45,000 as an adhesive in the bonding layer on the electroconductive support and as a binder in the charge transporting layer forming a homogeneous phase to provide a receptive and retentive base layer for the charge-generating layer.
Inventors
- 👤 Mike S. H. Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:24
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/142; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0557; G03G5/0564
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
An organic photoconductive element comprising an electroconductive plastic film support, a bonding layer of an adhesive material on said support, a charge generating layer comprising a particulate charge generating organic chemical adhered to said bonding layer, and a charge transport layer comprising a charge transport organic chemical and a binder material for the charge transport chemical adhered to said charge generating layer, characterized by said adhesive bonding layer and said binder material comprising at least one polycarbonate resin having a weight average molecular weight ranging from about 25,000 to about 45,000, said binder material forming a homogeneous phase within said charge transport layer and comprising from about 35 to about 65 weight percent based upon the weight of the charge transport layer.
Claim 2
Dependent Claim
122 words
An organic photoconductive element comprising an electroconductive plastic film support, a bonding layer of an adhesive material on said support, a charge generating layer comprising a particulate charge generating organic chemical adhered to said bonding layer, and a charge transport layer comprising a charge transport organic chemical and a binder material for the charge transport chemical adhered to said charge generating layer, characterized by said adhesive bonding layer and said binder material comprising at least one polycarbonate resin having a weight average molecular weight ranging from about 25,000 to about 45,000, said binder material forming a homogeneous phase within said charge transport layer and comprising from about 35 to about 65 weight percent based upon the weight of the charge transport layer.
Claim 3
Dependent Claim
49 words
An organic photoconductive element according to claim 1 wherein said polycarbonate resins are selected from the group consisting of poly(oxycarbonyloxy-1, 4-phenyleneisopropylidene-1, 4-phenylene), poly(oxycarbonyloxyhexamethylene), poly(oxycarbonyloxy-2-methyl-1, 4-phenylenecyclohexylidene-3-methyl-1, 4-phenylene), poly (oxycarbonyloxy-2-methyl-1, 4-phenyleneisopropylidene-1, 4-phenylene), poly(oxycarbonyloxy-3-methyl-1, 4-phenylenebenzylidene-2-methyl-1, 4-phenylene), poly(oxycarbonyloxy-1, 4-phenylene-2, 2-butylidene-1, 4-phenylene), poly(oxycarbonyloxy-1, 4-phenyleneisobutylidene-1, 4-phenylene), poly [oxycarbonyloxy-1, 4-phenylenedi(isopropylidene-1, 4-phenylene)], and poly[oxycarbonyloxy-1, 4-phenylene (methyl)phenylmethylene-1, 4-phenylene].
Claim 4
Dependent Claim
27 words
An organic photoconductive element according to claims 1 or 2 wherein the weight average molecular weight of said polycarbonate resins varies from about 30,000 to about 40,000.
Claim 5
Dependent Claim
17 words
An organic photoconductor element according to claim 1 wherein said charge generating organic chemical comprises Chlorodiane Blue.
Claim 6
Independent Claim
177 words
A method for forming an electrophotographic image comprising: (a) electrostatically charging in the dark the surface of an organic photoconductive element comprising an electroconductive plastic film support, a bonding layer of an adhesive material on said support, a charge generating layer comprising a particulate charge generating organic chemical adhered to said bonding layer, and a charge transport layer comprising a charge transport organic chemical and a binder material for the charge transport chemical adhered to said charge generating layer, characterized by said adhesive bonding layer and said binder material comprising at least one polycarbonate resin having a weight average molecular weight ranging from about 25,000 to about 45,000, said binder material forming a homogeneous phase within said charge transport layer and comprising from about 35 to about 65 weight percent based upon the weight of the charge transport layer; (b) exposing said surface of the photoconductive element to actinic radiation; and (c) discharging said surface of the photoconductive element in an image-wise fashion corresponding to the pattern of actinic radiation to produce a latent electrostatic image thereon.
Claim 7
Independent Claim
177 words
A method for forming an electrophotographic image comprising: (a) electrostatically charging in the dark the surface of an organic photoconductive element comprising an electroconductive plastic film support, a bonding layer of an adhesive material on said support, a charge generating layer comprising a particulate charge generating organic chemical adhered to said bonding layer, and a charge transport layer comprising a charge transport organic chemical and a binder material for the charge transport chemical adhered to said charge generating layer, characterized by said adhesive bonding layer and said binder material comprising at least one polycarbonate resin having a weight average molecular weight ranging from about 25,000 to about 45,000, said binder material forming a homogeneous phase within said charge transport layer and comprising from about 35 to about 65 weight percent based upon the weight of the charge transport layer; (b) exposing said surface of the photoconductive element to actinic radiation; and (c) discharging said surface of the photoconductive element in an image-wise fashion corresponding to the pattern of actinic radiation to produce a latent electrostatic image thereon.
Claim 8
Dependent Claim
45 words
A method according to claim 5 wherein said polycarbonate resins are selected from the group consisting of poly(oxycarbonyloxy-1, 4l-phenyleneisopropylidene-1, 4-phenylene), poly(oxycarbonyloxyhexamethylene), poly (oxycarbonyloxy-2-methyl-1, 4-phenylenecyclohexylidene-3-methyl-1, 4-phenylene), poly(oxycarbonyloxy-2-methyl-1, 4-phenyleneisopropylidene-1, 4-phenylene), poly(oxycarbonyloxy-3-methyl-1, 4-phenylenebenzylidene-2-methyl-1, 4-phenylene), poly(oxycarbonyloxy-1, 4-phenylene-2, 2-butylidene-1, 4-phenylene), poly(oxycarbonyloxy-1, 4-phenyleneisobutylidene-1, 4-phenylene), poly[oxycarbonyloxy-1, 4-phenylenedi(isopropylidene-1, 4-phenylene)], and poly[oxycarbonyloxy-1, 4-phenylene(methyl)phenylmethylene-1, 4-phenylene].
Claim 9
Independent Claim
25 words
A method according to claims 5 or 6 wherein the weight average molecular weight of said polycarbonate resins varies from about 30,000 to about 40,000.
References Cited (Backward Citations)
US4301224A
Cited
US4273846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |