US4533612A
Expired / Lapsed
US
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Electrophotographic recording materials containing special charge carrier-transporting compounds
Assignee: BASF SE
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Filing: 1984-11-27
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Granted: 1985-08-06
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Expires: 2004-11-27
Abstract
Abstract Electrophotographic recording materials which comprise an electrically conductive base, charge carrier-producing compounds (sensitizers), and charge carrier-transporting compounds, possess high photoconductivity and low conductivity in the dark, and contain, as charge carrier-transporting compounds, 2-substituted benzotriazoles of the formula ##STR1## are used for reprographic purposes and for the production of electrophotographic printing plates, in particular offset printing plates.
Inventors
- 👤 Heinz Eilingsfeld
- 👤 Karl-Heinz Etzbach
- 👤 Gerhard Hoffmann
- 👤 Peter Neumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:27
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0624; G03G5/0627; G03G5/0633; C; C07; C07D; C07D249/00; C07D249/16; C07D249/18; C07D249/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
97 words
An electrophotographic recording material comprising an electrically conductive base, charge carrier-producing compounds and charge carrier-transporting compounds, which contains an effective amount, as charge carrier-transporting compounds, of one or more compounds of the formula (I) ##STR7## where R 1 and R 2 are identical or different and are each hydrogen, alkyl, allyl, benzyl or unsubstituted or substituted phenyl, or R 1 and R 2 together are ##STR8## where R 5 is NR 1 R 2 , R 3 is hydrogen, alkyl, alkoxy or halogen and R 4 is hydrogen, alkyl, alkoxy, vinyl, allyl, dialkylamino, nitro, cyano or acryloyl.
Claim 2
Dependent Claim
97 words
An electrophotographic recording material comprising an electrically conductive base, charge carrier-producing compounds and charge carrier-transporting compounds, which contains an effective amount, as charge carrier-transporting compounds, of one or more compounds of the formula (I) ##STR7## where R 1 and R 2 are identical or different and are each hydrogen, alkyl, allyl, benzyl or unsubstituted or substituted phenyl, or R 1 and R 2 together are ##STR8## where R 5 is NR 1 R 2 , R 3 is hydrogen, alkyl, alkoxy or halogen and R 4 is hydrogen, alkyl, alkoxy, vinyl, allyl, dialkylamino, nitro, cyano or acryloyl.
Claim 3
Dependent Claim
40 words
An electrophotographic recording material as described in claim 1, wherein, in formula (I), R 1 is hydrogen, alkyl, benzyl or phenyl, R 2 is alkyl, benzyl or phenyl, R 3 is hydrogen and R 4 is hydrogen, alkoxy or halogen.
Claim 4
Dependent Claim
36 words
An electrophotographic recording material as described in claim 1, which comprises an electrically conductive base, a layer containing charge carrier-producing compounds and another layer containing charge carrier-transporting compounds of the formula (I) given in claim 1.
Claim 5
Dependent Claim
63 words
A recording material for the production of an electrophotographic printing plate as described in claim 1, which comprises, on a 0.08-0.6 mm thick base suitable for printing plates, a photosemiconducting layer containing (a) one or more binders, (b) one or more charge carrier-transporting compounds as described in claim 1 and (c) one or more dyes as sensitizers, with or without (d) further additives.
Claim 6
Dependent Claim
19 words
A recording material as described in claim 4, wherein the binder is soluble in basic aqueous or alcoholic solvents.
Claim 7
Dependent Claim
21 words
A recording material as described in claim 5, wherein the binder has a mean molecular weight of from 800 to 50,000.
Claim 8
Dependent Claim
47 words
A recording material as described in claim 4, wherein the binder is a styrene/maleic anhydride/acrylic or methacrylic acid copolymer containing from 5 to 50% by weight of maleic anhydride as copolymerized units, and from 5 to 35% by weight of acrylic and/or methacrylic acid as copolymerized units.
Claim 9
Dependent Claim
63 words
A recording material for the production of an electrophotographic printing plate as described in claim 2, which comprises, on a 0.08-0.6 mm thick base suitable for printing plates, a photosemiconducting layer containing (a) one or more binders, (b) one or more charge carrier-transporting compounds as described in claim 2, and (c) one or more dyes as sensitizers, with or without (d) further additives.
Claim 10
Dependent Claim
43 words
An electrophotographic recording material as described in claim 1, wherein the alkyl groups of the compounds of formula I have from 1 to 2 carbon atoms and wherein the alkoxy groups of the compounds of formula I have 1 or 2 carbon atoms.
Claim 11
Dependent Claim
26 words
An electrophotographic recording material as described in claim 2, wherein the alkyl groups of the compounds of formula 1 have from 1 to 2 carbon atoms.
Claim 12
Dependent Claim
17 words
A recording material as described in claim 4, wherein the printing plate is an offset printing plate.
Claim 13
Dependent Claim
61 words
A recording material as defined in claim 1, wherein the components of a single-layer system are present in the following amounts: (a) from 45 to 75 parts by weight of a binder; (b) from 30 to 60 parts by weight of charge carrier-transport compounds of the formula I; and (c) from 0.05 to 0.8 parts by weight of a charge-carrier-producing compound.
Claim 14
Dependent Claim
23 words
A recording material as defined in claim 12, which further includes from 5 to 25 parts by weight of another, essentially inactive binder.
Claim 15
Dependent Claim
43 words
A recording material as defined in claim 3, wherein the charge-transporting layer (b) contains (b1) from 30 to 60 parts by weight of one or more charge carrier-transporting compounds (I) and (b2) from 45 to 75 parts by weight of an organic binder.
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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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |