Patent US5543224A successfully refreshed from Google Patents.
US5543224A
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High molecular electret film
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1995-04-10
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Granted: 1996-08-06
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Expires: 2015-04-10
Abstract
Abstract A high molecular electret film which comprises an electret film of a blend of a poly(2,6-dialkyl-1,4-phenylene oxide) consisting of a recurring unit represented by the following general formula (1), ##STR1## wherein R is an alkyl group having not more than 4 carbon atoms, and a styrene resin. The electret film exhibits vary favorable electric charge-retaining property and favorable adhesiveness to metals. The film is very effectively used for a developing sleeve in an electrophotographic apparatus, for a cleaning device, for a transfer device, etc. and exhibits desired effects stably and for extended periods of time.
Inventors
- 👤 Toshihisa Sakai
- 👤 Masanori Kawasumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:01
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/0005; G03G21/0058; C; C08; C08L; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/123; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0818; G03G15/14; G03G15/16; G03G15/1665; G03G15/167; G03G15/1685; G03G2215/00; G03G2215/06; G03G2215/0602; G03G2215/0604; G03G2215/0614; G03G2215/08; G03G2215/0855; G03G2215/0858; G03G2215/0861; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/139; Y10T428/31; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31696
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
85 words
An electret film formed on an electrically conductive substrate which film comprises a blend of a poly(2,6-dialkyl-1,4-phenylene oxide) consisting of recurring units represented by the following general formula (1), ##STR3## in which R is an alkyl group having 1 to 4 carbon atoms, and a styrene resin, wherein said blend contains said poly(2,6-dialkyl-1,4-phenylene oxide) and said styrene resin at a weight ratio of from 9:1 to 5:5, and said electret film has a surface charge density of 10 -10 to 10 -8 C/cm 2 .
Claim 2
Dependent Claim
85 words
An electret film formed on an electrically conductive substrate which film comprises a blend of a poly(2,6-dialkyl-1,4-phenylene oxide) consisting of recurring units represented by the following general formula (1), ##STR3## in which R is an alkyl group having 1 to 4 carbon atoms, and a styrene resin, wherein said blend contains said poly(2,6-dialkyl-1,4-phenylene oxide) and said styrene resin at a weight ratio of from 9:1 to 5:5, and said electret film has a surface charge density of 10 -10 to 10 -8 C/cm 2 .
Claim 3
Dependent Claim
31 words
An electret film formed on an electrically conductive substrate according to claim 1, wherein said styrene resin is a styrene/diene copolymer or a blend of polystyrene polymer and a diene polymer.
Claim 4
Dependent Claim
31 words
An electret film formed on an electrically conductive substrate according to claim 1 wherein said styrene resin comprises 99 to 60 moles of styrene and 1 to 40 mols of butadiene.
Claim 5
Dependent Claim
17 words
An electret film formed on an electrically conductive substrate according to claim 1 wherein R is methyl.
Claim 6
Dependent Claim
22 words
An electret film formed on an electrically conductive substrate according to claim 1 wherein the electrically conductive substrate is a metal plate.
Claim 7
Dependent Claim
89 words
An electret film layer formed on the surface of an electrically conductive cylindrical sleeve, which layer comprises a blend of a Poly(2,6-dialkyl-1,4-phenylene oxide) consisting of recurring units represented by the following general formula(1), ##STR4## in which R is an alkyl group having 1 to 4 carbon atoms, and a styrene resin, wherein said blend contains the poly(2,6-dialkyl-1,4-phenylene oxide) and said styrene resin at a weight ratio of from 9:1 to 5:5, and said electret layer has a surface charge density of 10 -10 to 10 -8 C/cm 2 .
Claim 8
Dependent Claim
89 words
An electret film layer formed on the surface of an electrically conductive cylindrical sleeve, which layer comprises a blend of a Poly(2,6-dialkyl-1,4-phenylene oxide) consisting of recurring units represented by the following general formula(1), ##STR4## in which R is an alkyl group having 1 to 4 carbon atoms, and a styrene resin, wherein said blend contains the poly(2,6-dialkyl-1,4-phenylene oxide) and said styrene resin at a weight ratio of from 9:1 to 5:5, and said electret layer has a surface charge density of 10 -10 to 10 -8 C/cm 2 .
Claim 9
Dependent Claim
31 words
An electret film formed on an electrically conductive sleeve according to claim 6 wherein said styrene resin comprises 99 to 60 moles of styrene and 1 to 40 mols of butadiene.
Claim 10
Dependent Claim
17 words
An electret film formed on an electrically conductive sleeve according to claim 6 wherein R is methyl.
Claim 11
Dependent Claim
26 words
An electret film formed on an electrically conductive sleeve according to claim 6 wherein the electrically conductive sleeve is a device for conveying a developing agent.
Claim 12
Dependent Claim
32 words
An electret film formed on an electrically conductive sleeve according to claim 6, wherein said styrene resin is a styrene/diene copolymer or a blend of a polystyrene polymer and a diene polymer.
Claim 13
Independent Claim
124 words
A device for conveying a developing agent comprising an electret film layer formed on the surface of an electrically conducting sleeve, which layer comprises a blend of a poly(2,6-dialkyl-1,4-phenylene oxide) consisting of recurring units represented by the following general formula (1), ##STR5## in which R is an alkyl group having 1 to 4 carbon atoms, and a styrene resin, wherein said blend contains the poly(2,6-dialkyl-1,4-phenylene oxide) and said styrene resin at a weight ratio of from 9:1 to 5:5, and said electret layer is formed by applying a coating solution which contains the blend to the surface of the electrically conductive sleeve, drying and electrically polarizing the electret layer to obtain a surface charge density of 10 -10 to 10 -8 C/cm 2 .
Claim 14
Independent Claim
124 words
A device for conveying a developing agent comprising an electret film layer formed on the surface of an electrically conducting sleeve, which layer comprises a blend of a poly(2,6-dialkyl-1,4-phenylene oxide) consisting of recurring units represented by the following general formula (1), ##STR5## in which R is an alkyl group having 1 to 4 carbon atoms, and a styrene resin, wherein said blend contains the poly(2,6-dialkyl-1,4-phenylene oxide) and said styrene resin at a weight ratio of from 9:1 to 5:5, and said electret layer is formed by applying a coating solution which contains the blend to the surface of the electrically conductive sleeve, drying and electrically polarizing the electret layer to obtain a surface charge density of 10 -10 to 10 -8 C/cm 2 .
Claim 15
Dependent Claim
24 words
A device according to claim 11 wherein said styrene resin comprises 99 to 60 moles of styrene and 1 to 40 mols of butadiene.
Claim 16
Dependent Claim
10 words
A device according to claim 11 wherein R is methyl.
Claim 17
Dependent Claim
14 words
A device according to claim 11 wherein the electrically conductive sleeve substrate is aluminum.
Claim 18
Dependent Claim
25 words
A device according to claim 11 wherein said styrene resin is a styrene/diene copolymer or a blend of a polystyrene polymer and a diene polymer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-08-06 | 2000-02-05 | 2000-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-06 | 2004-02-05 | 2004-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-06 | 2008-02-05 | 2008-08-06 | $7700.00 | Window Closed / Lapsed |