US4603098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic recording material
Assignee: Hoechst AG
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Filing: 1985-02-07
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Granted: 1986-07-29
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Expires: 2005-02-07
Abstract
Abstract An electrophotographic recording material is described which comprises an electrically conductive support and a photoconductive layer comprising a photoconductor, a binder, and at least one bis-benzothiazole-pentamethine-cyanine having a particular structure. The aforementioned recording material displays a sensitization peak in the range between about 680 nm and 710 nm, and can be processed under visual control using bright safelights.
Inventors
- 👤 Werner Franke
- 👤 Richard Brahm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:45
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/02; C09B23/08; C09B23/083; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/09
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
184 words
An electrophotographic recording material which comprises an electrically conductive support and a photoconductive layer comprising (a) at least one organic photoconductor selected from the group consisting of an oxazole, an oxdiazole, a hydrazone and a pyrazoline, (b) a binder, and (c) a sensitizing agent comprised of at least one bis-benzothiazole-pentamethine-cyanine represented by the formula: ##STR10## wherein R 1 denotes a hydrogen atom or a halogen atom; R 2 denotes (i) an alkyl group having from 1 to 3 carbon atoms, (ii) --(CH 2 ) m --SO 3 - or (iii) --(CH 2 ) n --COO - ; R 3 denotes (i) an alkyl group having from 1 to 3 carbon atoms, (ii) --(CH 2 ) m SO 3 H, (iii) --(CH 2 ) n COOH or (iv) an alkali metal salt of (ii) or (iii), where m is 2 or 3 and n is 1 or 2; and X denotes p-toluene sulfonate, bromide, iodide, perchlorate or, if R 2 denotes the (ii) or (iii) structure, nothing, said recording material displaying a sensitization peak in the range between about 680 nm and about 710 nm.
Claim 2
Dependent Claim
184 words
An electrophotographic recording material which comprises an electrically conductive support and a photoconductive layer comprising (a) at least one organic photoconductor selected from the group consisting of an oxazole, an oxdiazole, a hydrazone and a pyrazoline, (b) a binder, and (c) a sensitizing agent comprised of at least one bis-benzothiazole-pentamethine-cyanine represented by the formula: ##STR10## wherein R 1 denotes a hydrogen atom or a halogen atom; R 2 denotes (i) an alkyl group having from 1 to 3 carbon atoms, (ii) --(CH 2 ) m --SO 3 - or (iii) --(CH 2 ) n --COO - ; R 3 denotes (i) an alkyl group having from 1 to 3 carbon atoms, (ii) --(CH 2 ) m SO 3 H, (iii) --(CH 2 ) n COOH or (iv) an alkali metal salt of (ii) or (iii), where m is 2 or 3 and n is 1 or 2; and X denotes p-toluene sulfonate, bromide, iodide, perchlorate or, if R 2 denotes the (ii) or (iii) structure, nothing, said recording material displaying a sensitization peak in the range between about 680 nm and about 710 nm.
Claim 3
Dependent Claim
15 words
A recording material as claimed in claim 1, wherein R 1 denotes chlorine or bromine.
Claim 4
Dependent Claim
19 words
A recording material as claimed in claim 1 wherein said bis-benzothiazole-pentamethine-cyanine comprises a compound represented by the formula: ##STR11##
Claim 5
Dependent Claim
26 words
A recording material as claimed in claim 1 wherein the said bis-benzothiazole-pentamethine-cyanine comprises a compound represented by the formula: ##STR12## wherein (Me) denotes an alkali metal.
Claim 6
Dependent Claim
38 words
A recording material as claimed in claim 1, wherein said sensitizing agent further comprises a sensitizing dye which displays a sensitization peak below 670 nm, with a steep drop of sensitivity at the short-wave edge of the spectrum.
Claim 7
Dependent Claim
17 words
A recording material as claimed in claim 5, wherein said sensitizing dye comprises Acid Green (C.I. 42,095).
Claim 8
Dependent Claim
13 words
A recording material as claimed in claim 1, wherein the photoconductor comprises 2,5-bis-(4'-diethylaminophenyl)-1,3,4-oxdiazole.
Claim 9
Dependent Claim
13 words
A recording material as claimed in claim 1, wherein the photoconductor comprises 2-vinyl-4-(2'-chlorophenyl)-5-(4"-diethylaminophenyl)-oxazole.
Claim 10
Dependent Claim
13 words
A recording material as claimed in claim 1, wherein the photoconductor comprises 2-phenyl-4-(2'-chlorophenyl)-5-(4"-diethylaminophenyl)-oxazole.
Claim 11
Dependent Claim
20 words
A recording material as claimed in claim 1, wherein said support comprises a metal base or a metallized plastic film.
Claim 12
Dependent Claim
20 words
A recording material as claimed in claim 1, wherein said binder comprises a styrene-maleic anhydride copolymer or a phenol resin.
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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) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |