US5069993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoreceptor layers containing polydimethylsiloxane copolymers
Assignee: Xerox Corp
•
Filing: 1989-12-29
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Granted: 1991-12-03
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Expires: 2009-12-29
Abstract
Abstract An exposed layer in an electrophotographic imaging member is provided with increased resistance to stress cracking and reduced coefficient of surface friction, without adverse effects on optical clarity and electrical performance. The layer contains a polydimethylsiloxane copolymer and an inactive film forming resin binder.
Inventors
- 👤 Susan Robinette
- 👤 Joseph Mammino
- 👤 Kathleen M. Carmichael
- 👤 Emery G. Tokoli
- 👤 Anita P. Lynch
- 👤 Robert C. U. Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:31
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0557; G03G5/0578; G03G5/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
51 words
An electrophotographic imaging member, comprising at least one exposed layer which contains a polydimethylsiloxane copolymer and a film forming resin binder, the polydimethylsiloxane copolymer being present in an amount to prevent undue phase separation, said layer being selected from the group consisting of a charge transport layer and an anti-curl layer.
Claim 2
Dependent Claim
51 words
An electrophotographic imaging member, comprising at least one exposed layer which contains a polydimethylsiloxane copolymer and a film forming resin binder, the polydimethylsiloxane copolymer being present in an amount to prevent undue phase separation, said layer being selected from the group consisting of a charge transport layer and an anti-curl layer.
Claim 3
Dependent Claim
37 words
The imaging member of claim 1, wherein said exposed layer contains about 1 to about 50 parts by weight of said copolymer and about 99 to about 50 parts by weight of said film forming resin binder.
Claim 4
Dependent Claim
27 words
The imaging member of claim 1, wherein said exposed layer is a charge transport layer containing said copolymer, said film forming resin binder and charge transport molecules.
Claim 5
Dependent Claim
40 words
The imaging member of claim 3, wherein said copolymer is a block copolymer of first blocks and second blocks, said first blocks being polydimethylsiloxane and said second blocks being selected from the group consisting of bisphenols, polystyrenes, polyethersulfones, and polyurethanes.
Claim 6
Dependent Claim
32 words
The imaging member of claim 3, wherein said copolymer is polydimethylsiloxane cobisphenol A block copolymer, said film forming resin binder is bisphenol A polycarbonate, and said charge transport molecules are aromatic amines.
Claim 7
Dependent Claim
43 words
The imaging member of claim 5, wherein said aromatic amines are of the formula ##STR6## wherein X is an alkyl group having 1 to about 4 carbon atoms and Y is H or an alkyl group having 1 to about 4 carbon atoms.
Claim 8
Dependent Claim
24 words
The imaging member of claim 5, wherein said copolymer is present in an amount of about 1 to about 10% by weight of binder.
Claim 9
Dependent Claim
29 words
The imaging member of claim 3, wherein said copolymer is polydimethylsiloxane polystyrene block copolymer, said film forming resin binder is polystyrene, and said charge transport molecules are aromatic amines.
Claim 10
Dependent Claim
43 words
The imaging member of claim 8, wherein said aromatic amines are of the formula ##STR7## wherein X is an alkyl group having 1 to about 4 carbon atoms and Y is H or an alkyl group having 1 to about 4 carbon atoms.
Claim 11
Dependent Claim
24 words
The imaging member of claim 8, wherein said copolymer is present in an amount of about 40 to about 50% by weight of binder
Claim 12
Dependent Claim
14 words
The imaging member of claim 1, wherein said exposed layer is an anti-curl layer.
Claim 13
Dependent Claim
48 words
The imaging member of claim 11, wherein said film forming resin binder is selected from the group consisting of polystyrene, bisphenol polycarbonate and polyurethane and said copolymer is selected from corresponding members of the group consisting of polydimethylsiloxane cobisphenol A, polydimethylsiloxane cobisphenol C, polydimethylsiloxane copolystyrene and polydimethylsiloxane copolyurethane.
Claim 14
Dependent Claim
28 words
The imaging member of claim 11, wherein said film forming resin binder is bisphenol polycarbonate and said copolymer is one of PDMS cobisphenol A and PDMS cobisphenol C.
Claim 15
Dependent Claim
50 words
An electrophotographic imaging member comprising: a substrate layer; a charge generating layer; and a charge transport layer which contains about 99 to about 50 parts by weight of an inactive film forming resin binder, about 1 to about 50 parts by weight of a polydimethylsiloxane copolymer, and charge transport molecules.
Claim 16
Dependent Claim
50 words
An electrophotographic imaging member comprising: a substrate layer; a charge generating layer; and a charge transport layer which contains about 99 to about 50 parts by weight of an inactive film forming resin binder, about 1 to about 50 parts by weight of a polydimethylsiloxane copolymer, and charge transport molecules.
Claim 17
Dependent Claim
30 words
The imaging member of claim 14, wherein said copolymer is polydimethylsiloxane cobisphenol A block copolymer, said resin binder is bisphenol A polycarbonate, and said charge transport molecules are aromatic amines.
Claim 18
Dependent Claim
43 words
The imaging member of claim 15, wherein said aromatic amines are of the formula ##STR8## wherein X is an alkyl group having 1 to about 4 carbon atoms and Y is H or an alkyl group having 1 to about 4 carbon atoms.
Claim 19
Dependent Claim
24 words
The imaging member of claim 16, wherein said copolymer is present in an amount of about 5% by weight of said film forming binder.
Claim 20
Dependent Claim
42 words
An electrophotographic imaging member comprising: a substrate having a conductive layer; a charge blocking layer; an adhesive layer; a charge generating layer; and a charge transport layer which contains a weight ratio of 1:0.95:0.05 of aromatic amine:polycarbonate resin:PDMS bisphenol A block copolymer.
Claim 21
Dependent Claim
42 words
An electrophotographic imaging member comprising: a substrate having a conductive layer; a charge blocking layer; an adhesive layer; a charge generating layer; and a charge transport layer which contains a weight ratio of 1:0.95:0.05 of aromatic amine:polycarbonate resin:PDMS bisphenol A block copolymer.
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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) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |