US4052210A
Expired / Lapsed
US
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Electrophotographic copying process and reproduction element
Assignee: Canon Production Printing Holding BV
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Filing: 1976-06-30
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Granted: 1977-10-04
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Expires: 1996-06-30
Abstract
Abstract In electrophotographic copying processes use is made of a reproduction element comprising on a conductive support a photoconductive layer containing dispersed in a binder a bisazo naphthol compound having a certain structure of substituents whereby the reproduction element exhibits relatively high light-sensitivity and is repeatedly exposable and developable imagewise so as to be useful for indirect electrophotographic copying. Special binder compositions enhance the light-sensitivity of the element and special layer constructions are provided to suit it for certain uses.
Inventors
- 👤 Adrianus M. P. Hectors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:11
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/039; C09B35/205; C09B35/215; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0675; G03G5/0679; G03G5/0683
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
142 words
Electrophotographic copying process in which a latent image is formed on an electrophotographic reproduction element comprising a conductive support and a photoconductive layer by charging and imagewise exposing said layer, the photoconductive layer containing a bisazo naphthol compound, characterized in that said reproduction element contains in dispersion in a binder a bisazo naphthol compound having the general formula ##STR2## wherein R represents hydrogen or one or more OCH 3 or OC 2 H 5 groups or one or more chlorine or bromine atoms; X is hydrogen, chlorine or bromine; R' is hydrogen or a substituted or non-substituted aryl, heterocyclic aryl, aralkyl or lower alkyl group, and R" is hydrogen or a substituted or non-substituted lower alkyl or cycloalkyl group, or R' and R" together with the nitrogen atom to which they attach constitute a saturated or non-saturated 5- or 6- membered ring.
Claim 2
Dependent Claim
142 words
Electrophotographic copying process in which a latent image is formed on an electrophotographic reproduction element comprising a conductive support and a photoconductive layer by charging and imagewise exposing said layer, the photoconductive layer containing a bisazo naphthol compound, characterized in that said reproduction element contains in dispersion in a binder a bisazo naphthol compound having the general formula ##STR2## wherein R represents hydrogen or one or more OCH 3 or OC 2 H 5 groups or one or more chlorine or bromine atoms; X is hydrogen, chlorine or bromine; R' is hydrogen or a substituted or non-substituted aryl, heterocyclic aryl, aralkyl or lower alkyl group, and R" is hydrogen or a substituted or non-substituted lower alkyl or cycloalkyl group, or R' and R" together with the nitrogen atom to which they attach constitute a saturated or non-saturated 5- or 6- membered ring.
Claim 3
Dependent Claim
18 words
Electrophotographic copying process according to claim 1 characterized in that R represents a hydrogen, chlorine or bromine atom.
Claim 4
Dependent Claim
33 words
Electrophotographic copying process according to claim 2, characterized in that both X and R" represent a hydrogen atom, and R' is a lower alkyl group or a phenyl group, which may be substituted.
Claim 5
Dependent Claim
34 words
Electrophotographic copying process according to claim 1, characterized in that the binder is a combination of poly-N-vinyl-carbazole or polyvinyl pyrene with one of the following electron acceptors: 2,4,7-trinitrofluoren-9-on; 1,3,7-trinitrodibenzothiophene-5,5-dioxide; N-(2,4,7-trinitrofluoren-9-ylidene)-aniline, or p- or m-nitro-N-(2,4,7-trinitrofluoren-9-ylindene)-aniline.
Claim 6
Dependent Claim
24 words
Electrophotographic copying process according to claim 4, characterized in that the mole-proportion acceptor to photoconductive polymer lies between 1 : 20 1 : 3.
Claim 7
Dependent Claim
25 words
Electrophotographic copying process according to claim 5, characterized in that the weight ratio pigment to binder lies between 1 : 20 and 1 : 4.
Claim 8
Dependent Claim
24 words
Electrophotographic copying process according to claim 1, characterized in that, on an average, the diameter of the azo-pigment particles does not exceed 3 μ.
Claim 9
Dependent Claim
24 words
Electrophotographic copying process according to claim 1, characterized in that, on an average, the diameter of the azo-pigment particles does not exceed 1 μ.
Claim 10
Dependent Claim
22 words
Electrophotographic copying process according to claim 1 characterized in that the thickness of the photoconductive layer lies between 2 and 30 μ.
Claim 11
Dependent Claim
21 words
Electrophotographic copying process according to claim 1, characterized in that the photoconductive layer is a composite of a plurality of coatings.
Claim 12
Dependent Claim
120 words
Electrophotographic reproduction element comprising a conductive support having thereon a photoconductive layer containing a bisazo naphthol compound, characterized in that said layer contains in dispersion in a binder a bisazo naphthol compound having the general formula ##STR3## wherein R represents hydrogen or one or more OCH 3 or OC 2 H 5 groups or one or more chlorine or bromine atoms; X is hydrogen, chlorine or bromine; R' is hydrogen or a substituted or non-substituted aryl, heterocyclic aryl, aralkyl or lower alkyl group, and R" is hydrogen or a substituted or non-substituted lower alkyl or cyloalkyl group, or R' and R" together with the nitrogen atom to which they attach constitute a saturated or non-saturated 5- or 6- membered ring.
Claim 13
Dependent Claim
120 words
Electrophotographic reproduction element comprising a conductive support having thereon a photoconductive layer containing a bisazo naphthol compound, characterized in that said layer contains in dispersion in a binder a bisazo naphthol compound having the general formula ##STR3## wherein R represents hydrogen or one or more OCH 3 or OC 2 H 5 groups or one or more chlorine or bromine atoms; X is hydrogen, chlorine or bromine; R' is hydrogen or a substituted or non-substituted aryl, heterocyclic aryl, aralkyl or lower alkyl group, and R" is hydrogen or a substituted or non-substituted lower alkyl or cyloalkyl group, or R' and R" together with the nitrogen atom to which they attach constitute a saturated or non-saturated 5- or 6- membered ring.
Claim 14
Dependent Claim
16 words
Electrophotographic reproduction element according to claim 11, wherein R represents a hydrogen, chlorine or bromine atom.
Claim 15
Dependent Claim
30 words
Electrophotographic reproduction element according to claim 12, wherein X and R" represent a hydrogen atom, and R' is a lower alkyl group or a phenyl group, which may be substituted.
Claim 16
Dependent Claim
32 words
Electrophotographic reproduction element according to claim 11, wherein said binder is a combination of poly-N-vinyl-carbazole or polyvinyl pyrene with one of the following electron acceptors: 2,4,7-trinitrofluoren-9-on; 1,3,7-trinitrodibenzothiophene-5,5-dioxide; N-(2,4,7-trinitrofluoren-9-ylindene)-aniline, or p- or m-nitro-N-(2,4,7-trinitrofluoren-9ylindene)-aniline.
Claim 17
Dependent Claim
23 words
Electrophotographic reproduction element according to claim 14, wherein the mole-proportion acceptor to photoconductive polymer lies between 1 : 20 and 1 : 3.
Claim 18
Dependent Claim
23 words
Electrophotographic reproduction element according to claim 14, wherein the weight ratio pigment to binder lies between 1 : 20 and 1 : 4.
Claim 19
Dependent Claim
20 words
Electrophotographic reproduction element according to claim 11, wherein the average diameter of the azo-pigment particles does not exceed 3 μ.
Claim 20
Dependent Claim
20 words
Electrophotographic reproduction element according to claim 11, wherein the average diameter of the azo-pigment particles does not exceed 1 μ.
Claim 21
Dependent Claim
20 words
Electrophotographic reproduction element according to claim 11, wherein the thickness of the photoconductive layer lies between 2 and 30 μ.
Claim 22
Dependent Claim
19 words
Electrophotographic reproduction element according to claim 11, wherein the photoconductive layer is a composite of a plurality of coatings.
Claim 23
Dependent Claim
122 words
Electrophotographic reproduction element comprising a conductive support having thereon a photoconductive layer comprising, in dispersion in a binder consisting essentially of poly-N-vinylcarbazole containing as an electron acceptor 2, 4, 7-trinitrofluoren-9on or a condensation product of the same with aniline, a particulate bisazo naphthol compound of the formula ##STR4## in which R is hydrogen or a 3-chlorine atom and R 1 is a lower alkyl or a phenyl group, the weight ratio of binder to said bisazo naphthol compound being about 10 : 1 to about 5 : 1 and the molar ratio of binder to said electron acceptor being about 10 : 1 to about 5 : 1, the particles of said bisazo compound having an average diameter smaller than 1 micron.
Claim 24
Dependent Claim
122 words
Electrophotographic reproduction element comprising a conductive support having thereon a photoconductive layer comprising, in dispersion in a binder consisting essentially of poly-N-vinylcarbazole containing as an electron acceptor 2, 4, 7-trinitrofluoren-9on or a condensation product of the same with aniline, a particulate bisazo naphthol compound of the formula ##STR4## in which R is hydrogen or a 3-chlorine atom and R 1 is a lower alkyl or a phenyl group, the weight ratio of binder to said bisazo naphthol compound being about 10 : 1 to about 5 : 1 and the molar ratio of binder to said electron acceptor being about 10 : 1 to about 5 : 1, the particles of said bisazo compound having an average diameter smaller than 1 micron.
Claim 25
Dependent Claim
20 words
Electrophotographic reproduction element according to claim 21, wherein R comprises a 3-chlorine atom and R 1 is a phenyl group.
Claim 26
Dependent Claim
18 words
Electrophotographic reproduction element according to claim 21, wherein R is hydrogen and R 1 is an isopropyl group.
Claim 27
Dependent Claim
18 words
Electrophotographic reproduction element according to claim 21, wherein R is hydrogen and R 1 is a t-butyl group.
References Cited (Backward Citations)
US2294893A
Cited
US3977870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |