US4666812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic material with pyrimido-pyridobenzimidazole compound
Assignee: Hoechst AG
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Filing: 1986-01-24
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Granted: 1987-05-19
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Expires: 2006-01-24
Abstract
Abstract The photoconductor of an electrophotographic recording material comprising an electrically conductive support, an optional insulating interlayer, and a photoconductive single layer containing a binder, a dye or pigment sensitizer and a pyrimido[5',4':5,6]pyrido[1,2-a]benzimidazole charge transporting compound represented by the formula ##STR1## wherein R 1 and R 2 are identical or different and are hydrogen or an R 3 ,R 4 N group; R 3 and R 4 are identical or different and are (C 1 to C 4 )-alkyl, hydroxy-(C 1 to C 4 )-alkyl, phenyl or benzyl which are unsubstituted or (C 1 to C 4 )-alkyl-substituted, or, together with the N atom to which they are bonded, are an imidazolyl or triazolyl group; and R 5 is a benzothiazole, a benzoxazole or a benzimidazole group, is photosensitive in the visible range around 430 to 500 nm and can be sensitized for the longer-wavelength region with dyes.
Inventors
- 👤 Wolfgang Wiedemann
- 👤 Dieter Guenther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:23
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/12; C07D471/14; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0644; G03G5/0646; G03G5/0651; G03G5/0661
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
173 words
An electrophotographic recording material comprising an electrically conductive support and a photoconductive layer provided on said support, said photoconductive layer containing (i) a pyrimido[5',4':5,6]pyrido[1,2-a]benzimidazole charge transporting compound, (ii) a binder and (iii) a dye or pigment sensitizer, wherein said charge transporting compound (A) is represented by the formula ##STR4## wherein R 1 and R 2 are identical or different and are each hydrogen or an R 3 R 4 N group; R 3 and R 4 are identical or different and (1) are each (a) alkyl having 1 to 4 carbon atoms, (b) hydroxyalkyl having 1 to 4 carbon atoms, or (c) phenyl or benzyl which is unsubstituted substituted by an alkyl group having 1 to 4 carbon atoms, or (2), together with the N atom to which they are bonded, are an imidazolyl or a triazolyl group; and R 5 is a benzothiazole, a benzoxazole or a benzimidazole group, and (B) is present in said photoconductive layer in an amount ranging between about 25% and 65% by weight, relative to said binder.
Claim 2
Dependent Claim
173 words
An electrophotographic recording material comprising an electrically conductive support and a photoconductive layer provided on said support, said photoconductive layer containing (i) a pyrimido[5',4':5,6]pyrido[1,2-a]benzimidazole charge transporting compound, (ii) a binder and (iii) a dye or pigment sensitizer, wherein said charge transporting compound (A) is represented by the formula ##STR4## wherein R 1 and R 2 are identical or different and are each hydrogen or an R 3 R 4 N group; R 3 and R 4 are identical or different and (1) are each (a) alkyl having 1 to 4 carbon atoms, (b) hydroxyalkyl having 1 to 4 carbon atoms, or (c) phenyl or benzyl which is unsubstituted substituted by an alkyl group having 1 to 4 carbon atoms, or (2), together with the N atom to which they are bonded, are an imidazolyl or a triazolyl group; and R 5 is a benzothiazole, a benzoxazole or a benzimidazole group, and (B) is present in said photoconductive layer in an amount ranging between about 25% and 65% by weight, relative to said binder.
Claim 3
Dependent Claim
19 words
A recording material as claimed in claim 1, wherein said charge transporting compound is represented by the formula ##STR5##
Claim 4
Dependent Claim
16 words
The recording material as claimed in claim 1, wherein said binder is soluble under alkaline conditions.
Claim 5
Dependent Claim
40 words
A recording material as claimed in claim 3, wherein said binder comprises at least one selected from the group consisting of a copolymer of styrene and maleic anhydride, a copolymer of vinyl acetate and crotonic acid, and a phenolic resin.
Claim 6
Dependent Claim
18 words
A recording material as claimed in claim 1, wherein said photoconductive layer contains a homogeneously dissolved dye sensitizer.
Claim 7
Dependent Claim
18 words
A recording material as claimed in claim 1, wherein said photoconductive layer contains a pigments in disperse distribution.
Claim 8
Dependent Claim
22 words
A recording material as claimed in claim 1, further comprising an insulating intermediate layer interposed between said support and said photoconductive layer.
Claim 9
Dependent Claim
24 words
A recording material as claimed in claim 1 wherein said amount of said charge transporting compound is between about 25% and 50% by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |