US3647433A
Expired / Lapsed
US
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Dinitroarylmethine dyes as sensitizers in electrophotographic layers
Assignee: Eastman Kodak Co
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Filing: 1969-10-03
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Granted: 1972-03-07
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Expires: 1989-10-03
Abstract
Abstract Dinitroarylmethine dyes are useful for sensitizing photoconductive compositions used in electrophotographic layers. These dyes are light bleachable so that undesirable color imparted to background areas of the image-bearing element by the dyes is removable. Such bleaching increases the visual contrast of the reproduction.
Inventors
- 👤 Lawrence Edward Contois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:01
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0666; G03G5/0668; G03G5/067
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
12 words
The element of claim 1 wherein the photoconductor is an organic photoconductor.
Claim 2
Dependent Claim
14 words
The element of claim 1 wherein the photoconductive composition contains a polymeric film-forming binder.
Claim 3
Dependent Claim
26 words
An electrophotographic element comprising a support having coated thereon a photoconductive composition comprising an organic photoconductor and a sensitizer for said photoconductive composition having the formula:
Claim 4
Dependent Claim
14 words
The element of claim 4 wherein the photoconductive composition contains a polymeric film-forming binder.
Claim 5
Dependent Claim
16 words
The element of claim 4 wherein Z represents the atoms necessary to complete a thiazole nucleus.
Claim 6
Dependent Claim
16 words
The element of claim 4 wherein Z represents the atoms necessary to complete an imidazo nucleus.
Claim 7
Dependent Claim
16 words
The element of claim 4 wherein Z represents the atoms necessary to complete a pyrrolo(2,3-b)pyridine nucleus.
Claim 8
Dependent Claim
62 words
An electrophotographic element comprising a support having coated thereon a layer of a photoconductive composition comprising: a. from about 10 percent to about 60 percent by weight based on said photoconductive composition of an organic photoconductor, b. a film-forming polymeric binder for said photoconductor and c. 0.005% to about 5% by weight based on said photoconductive composition of a sensitizer comprising 2-(2,4-dinitrobenzylidene)-3-ethyl-2,3-dihydrothiazolo(4,5-)quinoline.
Claim 9
Dependent Claim
65 words
An electrophotographic element comprising a support having coated thereon a layer of a photoconductive composition comprising: a. from about 10 percent to about 60 percent by weight based on said photoconductive composition of an organic photoconductor, b. a film-forming polymeric binder for said photoconductor and c. 0.005 percent to about 5 percent by weight based on said photoconductive composition of a sensitizer comprising 1,3-diallyl-6-chloro-2-(2,4-dinitrobenzylidene)-1,2-dihydroimidazo(4,5-b) -quinoxaline.
Claim 10
Dependent Claim
65 words
An electrophotographic element comprising a support having coated thereon a layer of a photoconductive composition comprising: a. from about 10 percent to about 60 percent by weight based on said photoconductive composition of an organic photoconductor, b. a film-forming polymeric binder for said photoconductor and c. 0.005 percent to about 5 percent by weight based on said photoconductive composition of a sensitizer comprising 6-chloro-2-(2,4-dinitrobenzylidene)-1,3-diethyl-2,3-dihydro-1H-imidazo(4,5 -b)-quinoxaline.
Claim 11
Dependent Claim
62 words
An electrophotographic element comprising a support having coated thereon a layer of a photoconductive composition comprising: a. from about 10 percent to about 60 percent by weight based on said photoconductive composition of an organic photoconductor, b. a film-forming polymeric binder for said photoconductor and c. 0.005% to about 5% by weight based on said photoconductive composition of a sensitizer comprising 2-(2,4-dinitrobenzylidene)-1,3-diethyl-1,2-dihydroimidazo(4,5-b)quinoxaline.
Claim 12
Dependent Claim
65 words
An electrophotographic element comprising a support having coated thereon a layer of a photoconductive composition comprising: a. from about 10 percent to about 60 percent by weight based on said photoconductive composition of an organic photoconductor, b. a film-forming polymeric binder for said photoconductor and c. 0.005 percent to about 5 percent by weight based on said photoconductive composition of a sensitizer comprising 2-(2,4-dinitrobenzylidene)-1,3,3-trimethyl-1,2-dihydro-3H-pyrrolo(2,3-b) -pyridine.
Claim 13
Dependent Claim
35 words
A photoconductive composition comprising a photoconductor and as a sensitizer a dinitrophenylmethine dye terminated by a 5 to 6 membered heterocyclic nucleus of the type used in cyanine dyes containing at least one nitrogen atom.
Claim 14
Dependent Claim
12 words
The composition of claim 14 wherein the photoconductor is an organic compound.
Claim 15
Dependent Claim
11 words
The composition of claim 14 further comprising a polymeric film-forming binder.
Claim 16
Dependent Claim
66 words
A process for bleaching an image-bearing electrophotographic element having a layer of a photoconductive composition containing as a sensitizer a dinitrophenylmethine dye terminated by a 5- to 6-membered heterocyclic nucleus of the type used in cyanine dyes containing at least one nitrogen atom, said process comprising the step of subjecting the element to actinic radiation to which said dye is sensitive tO substantially bleach said dye.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |