Patent US5208128A successfully refreshed from Google Patents.
US5208128A
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Photoconductive recording material with special outermost layer
Assignee: Hologic Hitec Imaging GmbH
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Filing: 1990-11-09
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Granted: 1993-05-04
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Expires: 2010-11-09
Abstract
Abstract Photoconductive recording material which incorporates in an outermost layer a siloxane-copolymer including at least one polysiloxane block that is copolymerized with aromatic carbonate units, wherein the polysiloxane block(s) consist(s) of 5 to 200 chemically bonded diorgano siloxy units in which the organic substituents are selected from the group consisting of an alkyl, an aralkyl, an alkaryl and an aryl group, and said block(s) is (are) present in an amount by weight in the range of 0.3% to 6% with respect to the total weight of said copolymer.
Inventors
- 👤 David R. Terrell
- 👤 Stefaan K. De Meutter
- 👤 Peter Horlacher
- 👤 Volker Serini
- 👤 Ulrich Grigo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:10
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0557; G03G5/0578; G03G5/0592; G03G5/14; G03G5/147; G03G5/14708; G03G5/14713; G03G5/14747; G03G5/14752; G03G5/14756; G03G5/14773; G03G5/14791
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
198 words
A photoconductive recording material which incorporates in an outermost layer a siloxane-copolymer including at least one polysiloxane block that is copolymerized with aromatic carbonate units, wherein the polysiloxane block(s) consist(s) of 5 to 200 chemically bonded diorgano siloxy units in which the organic substituents are selected from the group consisting of an alkyl, an aralkyl, an alkaryl and an aryl group, and said block(s) is (are) present in an amount by weight in the range of 0.3% to 6% with respect to the total weight of said copolymer, and wherein the aromatic carbonate part of said copolymer is present in the range of 94 to 99.7% by weight of said copolymer, and in said part the aromatic carbonate units correspond to the following general formula (I): ##STR14## in which: X represents S, SO 2 , ##STR15## each of R 1 , R 2 , R 3 , R 4 , R 7 and R 8 (same or different) represents hydrogen, halogen, an alkyl group or an aryl group, and each of R 5 and R 6 (same or different) represents hydrogen, an alkyl group, an aryl group or together represent the necessary atoms to close a cycloaliphatic ring.
Claim 2
Dependent Claim
198 words
A photoconductive recording material which incorporates in an outermost layer a siloxane-copolymer including at least one polysiloxane block that is copolymerized with aromatic carbonate units, wherein the polysiloxane block(s) consist(s) of 5 to 200 chemically bonded diorgano siloxy units in which the organic substituents are selected from the group consisting of an alkyl, an aralkyl, an alkaryl and an aryl group, and said block(s) is (are) present in an amount by weight in the range of 0.3% to 6% with respect to the total weight of said copolymer, and wherein the aromatic carbonate part of said copolymer is present in the range of 94 to 99.7% by weight of said copolymer, and in said part the aromatic carbonate units correspond to the following general formula (I): ##STR14## in which: X represents S, SO 2 , ##STR15## each of R 1 , R 2 , R 3 , R 4 , R 7 and R 8 (same or different) represents hydrogen, halogen, an alkyl group or an aryl group, and each of R 5 and R 6 (same or different) represents hydrogen, an alkyl group, an aryl group or together represent the necessary atoms to close a cycloaliphatic ring.
Claim 3
Dependent Claim
57 words
A photoconductive recording material according to claim 1, wherein in said siloxane-copolymer the siloxane blocks are present in an amount by weight in the range of 0.5% to 5% with respect to the total weight of said copolymer and the aromatic carbonate part is present in the range of 95 to 99.5% by weight of said copolymer.
Claim 4
Dependent Claim
25 words
A photoconductive recording material according to claim 1, wherein said outermost layer serves as protective layer and consists of one or more of said siloxane-copolymers.
Claim 5
Dependent Claim
32 words
A photoconductive recording material according to claim 1, wherein in said outermost layer at least one of said siloxane-copolymers are present as binding agent for a charge generating and/or charge transporting substance.
Claim 6
Dependent Claim
29 words
A photoconductive recording material according to claim 1, wherein said outermost layer serving as protective layer contains said siloxane-copolymer in combination with at least one other binding agent polymer.
Claim 7
Dependent Claim
27 words
A photoconductive recording material according to claim 4, wherein in said outermost layer said siloxane-copolymer is present in combination with at least one other binding agent polymer.
Claim 8
Dependent Claim
66 words
A photoconductive recording material according to claim 5, wherein said siloxane-copolymer is present in combination with at least one other polymer selected from the group consisting of an acrylate and methacrylate resin, copolyester of a diol with isophthalic and/or terephthalic acid, polyvinyl acetal, polyurethane, polyester-urethane, aromatic polycarbonate, and polyestercarbonate, wherein the combination contains at least 2% by weight of said siloxane-copolymer in the total binder content.
Claim 9
Dependent Claim
33 words
A photoconductive recording material according to claim 1, wherein the siloxane concentration in the binder or binder mixture content of the outermost layer is in the range of 0.1 to 30% by weight.
Claim 10
Dependent Claim
33 words
A photoconductive recording material according to claim 1, wherein the siloxane concentration in the binder or binder mixture content of the outermost layer is in the range of 0.5 to 20% by weight.
Claim 11
Dependent Claim
25 words
A photoconductive recording material according to claim 1, wherein the number averaged molecular weight of said siloxane-copolymer is in the range of 10,000 to 400,000.
Claim 12
Dependent Claim
30 words
A photoconductive recording material according to claim 1, wherein in said siloxane-copolymer the aromatic polyester groups are derived from either isophthalic or terephthalic acid or both isophthalic and terephthalic acid.
Claim 13
Dependent Claim
44 words
A photoconductive recording material according to claim 1, wherein said recording material comprises an electrically conductive substrate with a charge carrier generating layer and a charge transfer layer superposed on said substrate, wherein said siloxane-copolymer is present in the outermost layer of said material.
Claim 14
Dependent Claim
33 words
A photoconductor recording material according to claim 1, wherein said recording material comprises as a charge generating substance metal-free X-phthalocyanine or 4,10-dibromo anthanthrone, and as a charge transporting substance tris(p-tolyl)amine or 1,2-bis(1,2-dihydro-2,2,4-trimethyl-quinolin-1-yl) ethane.
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) | 1996-05-03 | 1996-11-02 | 1997-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-03 | 2000-11-02 | 2001-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-03 | 2004-11-02 | 2005-05-04 | $7700.00 | Window Closed / Lapsed |