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US3640708A
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Barrier layers for electrophotographic elements containing a blend of cellulose nitrate with a tetrapolymer having vinylidene chloride as the major constituent
Assignee: Eastman Kodak Co
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Filing: 1970-09-09
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Granted: 1972-02-08
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Expires: 1990-09-09
Abstract
Abstract An electrophotographic element comprised of a support, an electrically conductive layer and an insulating photoconductive layer is provided with a barrier layer composed of a blend of cellulose nitrate with a tetrapolymer of methyl acrylate, acrylonitrile, acrylic acid and vinylidene chloride interposed between the electrically conductive layer and the insulating photoconductive layer. Barrier layers of this composition provide good adhesion to the contiguous layers, so as to permit flexing of the element without damage, as well as excellent electrophotographic properties.
Inventors
- 👤 Wesley D Humphriss
- 👤 Lawrence C Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:49
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/142; Y; Y10; Y10S; Y10S526/00; Y10S526/934
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
29 words
An electrophotographic element as described in claim 1 wherein said blend consists of about 3 to about 15 parts of said tetrapolymer per part of cellulose nitrate by weight.
Claim 2
Dependent Claim
29 words
An electrophotographic element as described in claim 1 wherein said blend consists of about 4 to about 8 parts of said tetrapolymer per part of cellulose nitrate by weight.
Claim 3
Dependent Claim
26 words
An electrophotographic element as described in claim 1 wherein said blend consists of about 4.3 parts of said tetrapolymer per part of cellulose nitrate by weight.
Claim 4
Dependent Claim
50 words
An electrophotographic element as described in claim 1 wherein said tetrapolymer is composed of about 5 to about 20 percent by weight methyl acrylate, about 5 to about 20 percent by weight acrylonitrile, and about 2 to about 8 percent by weight acrylic acid, with the balance being vinylidene chloride.
Claim 5
Dependent Claim
38 words
An electrophotographic element as described in claim 1 wherein said tetrapolymer is composed of 10 percent by weight methyl acrylate, 15 percent by weight acrylonitrile, 6 percent by weight acrylic acid and 69 percent by weight vinylidene chloride.
Claim 6
Dependent Claim
46 words
An electrophotographic element as described in claim 1 wherein said tetrapolymer has an inherent viscosity, as measured at a concentration of 0.25 gram of polymer per 100 milliliters of cyclohexanone and at a temperature of 25* C., in the range from about 0.9 to about 1.8.
Claim 7
Dependent Claim
40 words
An electrophotographic element as described in claim 1 wherein said tetrapolymer has an inherent viscosity, as measured at a concentration of 0.25 gram of polymer per 100 milliliters of cyclohexanone and at a temperature of 25* C., of about 1.2.
Claim 8
Dependent Claim
28 words
An electrophotographic element as described in claim 1 wherein the barrier layer coverage on a dry basis is in the range from about 10 to about 200 mg./ft.2.
Claim 9
Dependent Claim
28 words
An electrophotographic element as described in claim 1 wherein the barrier layer coverage on a dry basis is in the range from about 30 to about 50 mg./ft.2.
Claim 10
Dependent Claim
88 words
An electrophotographic element comprising a support having coated thereon a conductive layer of a metal-containing semiconductor compound, said conductive layer having in contiguous relationship therewith a barrier layer consisting essentially of a blend of cellulose nitrate with a tetrapolymer of methyl acrylate, acrylonitrile, acrylic acid and vinylidene chloride, said tetrapolymer being composed of a major proportion by weight of vinylidene chloride and said blend being composed of a major proportion by weight of said tetrapolymer, and coated on said barrier layer a photoconductive layer containing an organic photoconductor.
Claim 11
Dependent Claim
16 words
An electrophotographic element as described in claim 11 wherein the metal-containing semiconductor compound is cuprous iodide.
Claim 12
Dependent Claim
106 words
An electrophotographic element as described in claim 12 wherein said blend consists of about 4 to about 8 parts of said tetrapolymer per part of cellulose nitrate by weight and said tetrapolymer is composed of about 5 to about 20 percent by weight methyl acrylate, about 5 to about 20 percent by weight acrylonitrile, about 2 to about 8 percent by weight acrylic acid, with the balance being vinylidene chloride, and has an inherent viscosity, as measured at a concentration of 0.25 gram of polymer per 100 milliliters of cyclohexanone and at a temperature of 25* C., in the range from about 0.9 to about 1.8.
Claim 13
Dependent Claim
86 words
An electrophotographic element as described in claim 12 wherein said blend consists of about 4.3 parts of said tetrapolymer per part of cellulose nitrate by weight and said tetrapolymer is composed of 10 percent by weight methyl acrylate, 15 percent by weight acrylonitrile, 6 percent by weight acrylic acid, and 69 percent by weight vinylidene chloride and has an inherent viscosity, as measured at a concentration of 0.25 gram of polymer per 100 milliliters of cyclohexanone and at a temperature of 25* C., of about 1.2.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |